signal transmission method, apparatus, and system

专利摘要:
embodiments of the present invention disclose a method of signal transmission, including: sending, by a first device, a first reference signal to a second device, wherein the first reference signal is used for phase tracking; the first reference signal is mapped to a first symbol; the first symbol includes a symbol that carries a data signal and precedes a second symbol; the second symbol is one or more consecutive symbols bearing a dmrs; and the one or more symbols include the 1st symbol bearing the dmrs. according to the aforementioned solution, it can be ensured that a pt-rs is also mapped to a symbol on which a data channel is mapped and that it precedes a symbol carrying a dmrs, thus ensuring performance of phase noise estimation.
公开号:BR112019019840A2
申请号:R112019019840
申请日:2018-03-24
公开日:2020-04-22
发明作者:Zhang Leiming；Dou Shengyue；Qin Yi；Sun Yu；Li Zhongfeng
申请人:Huawei Tech Co Ltd；
IPC主号:

专利说明:

“METHOD OF TRANSMISSION OF SIGNAL, APPLIANCE, AND SYSTEM”
FIELD OF TECHNIQUE [0001] This application refers to the field of wireless communications technologies and, in particular, to a method of transmitting signal, apparatus and system.
BACKGROUND [0002] With the development of mobile internet technologies, the demands for a communication rate and a capacity for communication are increasing more and more, and the existing low-spectrum resources are subject to increasing scarcity and fail to meet the requirements. Therefore, high frequency radio resources with rich spectrum capabilities become a focus of wireless communications research. In a wireless communications system, a frequency device, namely, a local oscillator, is not ideal. Random jitter from the local oscillator causes phase noise in an emitted carrier signal. The magnitude of the phase noise is directly related to a carrier frequency: The phase noise power changes according to 20log (n), where n is a number of times of frequency increase, which means that the noise power phase increase by 6 dB each time the carrier frequency is doubled. Therefore, the impact of phase noise cannot be ignored in high frequency wireless communications. For a wireless system evolved future, new radio (Radio New, NR), the partnership project of 3 generation 3GPP (The 3rd Generation Partnership Project) has incorporated high frequencies in a spectrum band adopted. Therefore, the related impact of phase noise also needs to be considered during the project.
[0003] A method most commonly used to estimate phase noise is to estimate a phase error using an inserted phase tracking reference signal, PT-RS. Currently, new radio (new radio, NR) supports a plurality of types of PT-RS symbol level time domain densities. As shown in Figure 1, in time domain, PT-RS can be continuously mapped to each symbol of a PUSCH (or PDSCH) (namely, a time domain density 1 shown in the figure), or it can be mapped for every 2nd symbol of a PUSCH (or a PDSCH) (namely, a density
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2/82 1/2 time domain shown in the figure), or ^the symbol of a PUSCH (or a PDSCH) can be mapped for each 4 (namely, a 1/4 time domain density shown in the figure).
[0004] In an additional discussion on an NR communications technology standard, the 3GPP expert group agreed on the following proposal:
[0005] A physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) can be sent in the same symbol through frequency division. As a result, the PDSCH is also mapped to a symbol that precedes a symbol that carries a demodulation reference signal (DMRS). For example, as shown in Figure 2, DMRS is mapped to symbols 3 and 4, PDCCH is mapped to symbols 0 and 1, and PDSCH is also mapped to symbols 0 and 1.
[0006] Furthermore, currently, there is no determined association relationship between a DMRS time domain symbol location and a number of PDCCH symbols. Likewise, the PDSCH is mapped, consequently, to the symbol that precedes the symbol that bears the DMRS. For example, as shown in Figure 2, the PDSCH is mapped to the symbol 2 that precedes the symbols that bear the DMRS.
[0007] However, in all existing PT-RS symbol mapping solutions, shown in Figure 1, a symbol that follows a symbol that bears the DMRS is determined as an initial symbol to which the PT-RS is mapped, and PT-RS can be used only to estimate phase noise from a data channel mapped to a symbol that follows the symbol that bears the DMRS.
SUMMARY [0008] This application provides a method, apparatus and system of signal transmission, to ensure that a PT-RS is also mapped to a symbol to which a data channel is mapped and which precedes a symbol that carries a DMRS, thus ensuring phase noise estimation performance.
[0009] According to a first aspect, this request provides an
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3/82 signal transmission method. The method is applied to a side of the first device (namely, a transmission end), and the method includes: sending, via a first device, a first reference signal to a second device, where the first reference is used for phase tracking; the first reference signal is mapped to a first symbol; the first symbol includes a symbol that carries a data signal and that precedes a second symbol in a time domain unit; and the second symbol is the first symbol that carries a demodulation reference signal in the time domain unit; or the second symbol is a plurality of consecutive symbols in the time domain unit, and the plurality of consecutive symbols includes the first symbol which carries the demodulation reference signal.
[0010] According to a second aspect, this application provides a method of signal transmission. The method is applied to a second device side (namely, a receiving end). The method includes: receiving, through a second device, a first reference signal sent by a first device, in which the first reference signal is mapped to a first symbol; the first symbol includes a symbol that carries a data signal and that precedes a second symbol in a time domain unit; and the second symbol is the first symbol that carries a demodulation reference signal in the time domain unit; or the second symbol is a plurality of consecutive symbols in the time domain unit and the plurality of consecutive symbols includes the first symbol which carries the demodulation reference signal.
[0011] In this order, the second symbol is a symbol that carries a front-loading DMRS, and the first reference signal is a PT-RS.
[0012] According to the signal transmission method described in the first and second aspects, it can be guaranteed that a PT-RS is also mapped to a symbol to which a data channel is mapped and that precedes a symbol which carries a DMRS, thus ensuring performance of phase noise estimation.
[0013] With reference to the first aspect or the second aspect, the mapping of PT-RS can include the following two parts:
[0014] 1. PT-RS mapping in a symbol that carries the signal of
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4/82 data and preceding the second symbol (the symbol that carries the front loading DMRS).
[0015] 2. PT-RS mapping in a symbol that carries the data signal and that follows the second symbol (the symbol that carries the front loading DMRS).
[0016] In this document, a symbol that precedes the second symbol is a symbol whose index is less than an index of the second symbol, and a symbol that follows the second symbol is a symbol whose index is greater than the index of the second symbol .
[0017] (1) Time domain PT-RS mapping rule in a symbol that precedes the second symbol [0018] According to a first mapping rule, PT-RS can be mapped to the 1 ^the symbol that carries the data signal and precedes the second symbol. In other words, the PT-RS mapping starts from the first symbol of a data channel (PUSCH / PDSCH). In this way, it can be guaranteed that the PT-RS is also mapped to a symbol to which a data channel is mapped and which precedes the second symbol, thus guaranteeing phase noise estimation performance.
[0019] According to a second mapping rule, an index of a symbol that is used to carry the PT-RS and that precedes the second symbol is related to a first difference. The first difference (H2) is a difference between an index (L ₀₎ of ^the first DMRS symbol port and the first index symbol which carries the data signal. In other words, the index of the symbol that is used to carry the PT-RS and that precedes the second symbol is related to a number of symbols that precede the second symbol.
[0020] (2) Time domain PT-RS mapping rule on a symbol that follows the second symbol [0021] According to a first mapping rule, an index of an initial symbol for which the PT-RS is mapped and following the second symbol can be determined based on a PT-RS time domain density. In addition, in ascending order of symbol index values, PT-RS is mapped to a symbol with a lower index between each L symbols. L is a reciprocal of the time domain density of PT-RS.
[0022] Specifically, the time domain density of PT-RS
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5/82 can be related to at least one of a type of CP, a subcarrier spacing and a modulation and coding scheme. Consult the subsequent content. The details are not described in this document. Specifically, the time domain density of the PT-RS and a mapping relationship between the time domain density of the PT-RS and the index of the initial symbol to which the PT-RS is mapped can be predefined by a protocol, or they can be configured by a network device using higher layer signaling (for example, RRC signaling) or a PDCCH.
[0023] According to a second mapping rule, PT-RS can be mapped, uniformly, to all time domain symbols (which include the second symbol, a symbol that precedes the second symbol and a symbol that follows the second symbol). In this way, PT-RS is also uniformly mapped to the symbol that follows the second symbol. Optionally, a PT-RS mapping priority is less than that of a PDCCH, PUCCH, SS block, CSI-RS, SRS or similar.
[0024] According to a third mapping rule, PT-RS is mapped to the last symbol that carries the data signal and that follows the second symbol, and is mapped, uniformly, to a symbol that follows the second symbol in decreasing order of symbol index values.
[0025] According to a fourth mapping rule, an index of a symbol that is used to carry the PT-RS and that follows the second symbol is related to a number of symbols that follow the second symbol.
[0026] With reference to the first aspect or the second aspect, according to PT-RS mapping rules domain records time in embodiment 1, PT-RS is mapped to the first symbol which carries the signal (PDSCH / PUSCH) in the time domain unit. Optionally, in the time domain unit, in ascending order of symbol index values, PT-RS is mapped to a symbol with a lower index between each L symbols. In other words, starting from the 1 ^the symbol that carries the data signal, PT-RS can be mapped, uniformly, within the time domain unit. L is a reciprocal of a PT-RS symbol level time domain density. A value of L can be determined
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6/82 based on PT-RS symbol level time domain density. For example, the value can be {1,2, 4}.
[0027] With reference to the first aspect or the second aspect, according to the previous time domain PT-RS mapping rules, in Mode 2, in the time domain unit, a location of a symbol that bears the PT -R may be related to a location of the symbol of the front loading door DMRS (namely, the second symbol), and one symbol and the last symbol carry the data signal (PDSCH / PUSCH). Herein, the first symbol that carries the data signal is a symbol with a lower index of time domain symbols in the unit that carry the data signal (PDSCH / PUSCH). The last symbol that carries the data signal is a symbol with a higher index between symbols in the time domain unit that carry the data signal (PDSCH / PUSCH).
[0028] Specifically, in the time domain unit, starting from the 1 ^the symbol that carries the data signal, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in ascending order of values of symbol index. In the time domain unit, starting from the last symbol that carries the data signal, PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in decreasing order of symbol index values.
[0029] With reference to the first aspect or the second aspect, according to all the previous time domain PT-RS mapping rules, in Mode 3, a location of a symbol that carries the PTRS may be related to a location the symbol that carries the front loading DMRS (namely the second symbol). Optionally, the location of the symbol that bears the PT-RS is additionally related to the symbol that bears the front loading DMRS (namely, the second symbol); a quantity of symbols in the time domain drive, whose symbol rates are smaller than a first index symbol to the front loading door DMRS; and a number of symbols, in the time domain unit, whose symbol indexes are greater than an index of the last symbol that carries the front-loading DMRS.
[0030] In Mode 3, specifically, in the time domain unit, an index of the last symbol that carries the PT-RS and that precedes the second
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7/82 symbol is related to the first difference. In addition, starting from the index of the last symbol that carries the PT-RS, in decreasing order of symbol indexes, the PT-RS is mapped, uniformly, to the symbol that bears the data signal and that precedes the second symbol . Specifically, in the time domain unit, an index of the first symbol that carries the PT-RS and following the second symbol is related to the amount of symbols following the second symbol. In addition, starting from the index of the 1 ⁰ symbol that carries the PT-RS, the PT-RS is mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indexes.
[0031] In Mode 3, optionally, when the time domain density of PT-RS is 1/2, namely, L = 2, if a difference Hi between the index of the last symbol carrying the loading DMRS front and an index of the last symbol that carries the data signal (PDSCH / PUSCH) and that follows the symbol that carries the front loading DMRS is an odd number, the PTRS is mapped to a symbol whose index is l _DM - _RS + 1. Optionally, starting from the symbol whose index is I _dm -rs +1, the PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indexes. If a H2 difference between the index of the first symbol to port 0 of front loading DMRS and an index of the first symbol to port 0 data signal (PDSCH / PUSCH) and above the front loading DMRS is an odd number, PT-RS is mapped to a symbol whose index is l ₀ - 1. Optionally, starting from the symbol whose index is Z ₀ ^_ l> ⁰ PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0032] In mode 3, optionally, when the time domain density of PT-RS is 1/2, namely, L = 2, if an H1 difference between the index of the last symbol that carries 0 DMRS loading and an index of the last symbol that carries the 0 data signal (PDSCH / PUSCH) and that follows the symbol that carries the front loading DMRS is an even number, PT-RS is mapped to a symbol whose index is I _dm - rs + 2. Optionally, starting from the symbol whose index is I _dm -rs + 2, the PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indices. H2 If a difference between the index of ^the first symbol that front loading port 0 and an index of the DMRS symbol 1
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8/82 that carries the data signal (PDSCH / PUSCH) and that precedes the front loading DMRS is an even number, the PT-RS is mapped to a symbol whose index is l ₀ - 2. Optionally, starting the From the symbol whose index is 10 ₀ -2, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0033] In Mode 3, optionally, when the time domain density of PT-RS is 1/4, namely, L = 4, if a difference Hi between the index of the last symbol that carries the loading DMRS front and an index of the last symbol that carries the data signal (PDSCH / PUSCH) and that follows the symbol that carries the front loading DMRS is an integer multiple of 4, PT-RS is mapped to a symbol whose index is l _DM - _RS + 4. Optionally, starting from the symbol whose index is l _DM - _RS + 4, PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol. If an H2 difference between the index of the 1 ^the symbol that carries the front loading DMRS and an index of the 1 ^the symbol that carries the data signal (PDSCH / PUSCH) and that precedes the front loading DMRS is a multiple integer of 4, PT-RS is mapped to a symbol whose index is l ₀ - 4. Optionally, starting from the symbol whose index is l ₀ - 4, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0034] In mode 3, optionally, when the time domain density of the PT-RS is 1/4, namely, L = 4, if an H1 difference between the index of the last symbol that carries the loading DMRS frontal and an index of the last symbol that carries the data signal (PDSCH / PUSCH) and that follows the symbol that carries the frontal loading DMRS satisfies Himod4 = 1, the PTRS is mapped to a symbol whose index is l _DM _ _RS + 1. Optionally, starting from the symbol whose index is 1 _DM - _RS + 1, the PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indexes. If a H2 difference between the index of the first symbol to port 0 of front loading DMRS and an index of the first symbol which carries the data signal (PDSCH / PUSCH) and above the front loading DMRS satisfies H2mod4 = 2, the PT-RS is mapped to a
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9/82 symbol whose index is l ₀ - 1. Optionally, starting from the symbol whose index is l ₀ -1, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0035] In mode 3, optionally, when the time domain density of the PT-RS is 1/4, namely, L = 4, if a difference Hi between the index of the last symbol that carries the loading DMRS and an index of the last symbol that carries the data signal (PDSCH / PUSCH) and that follows the symbol that carries the front-loading DMRS satisfies H-imod4 = 2, the PTRS is mapped to a symbol whose index is 1 _DM - _RS + 2. Optionally, starting from the symbol whose index is I _dm -rs + 2, the PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indices. If a H2 difference between the index of the first symbol to port 0 of front loading DMRS and an index of the first symbol which carries the data signal (PDSCH / PUSCH) and above the front loading DMRS satisfies H2mod4 = 2, the PT-RS is mapped to a symbol whose index is l ₀ - 2. Optionally, starting from the symbol whose index is l ₀ -2, the PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0036] In mode 3, optionally, when the time domain density of the PT-RS is 1/4, namely, L = 4, if an H1 difference between the index of the last symbol that carries the loading DMRS front and an index of the last symbol carrying 0 data signal (PDSCH / PUSCH) and following the symbol carrying the front loading DMRS satisfies Himod4 = 3, the PTRS is mapped to a symbol whose index is 1 _DM - _RS + 3. Optionally, starting from the symbol whose index is 1 _DM - _RS + 3, the PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indexes. If a H2 difference between the index of the first symbol to port 0 of front loading DMRS and an index of the first symbol which carries the data signal (PDSCH / PUSCH) and above the front loading DMRS satisfies H2mod4 = 3, the PT-RS is mapped to a symbol whose index is 1 _Q - 3. Optionally, starting from the symbol
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10/82 whose index is Z _o - 3, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0037] In modality 3, an index l of a symbol that carries the PTRS can be expressed using the following formula:
, _ Odm-rs + [Z <(Hpmod L] + L I ', if l> I ^ m-rs (l ₀ - [L - (—H ₂ ) mo L] —L-l', ifl <l ₀ , H ₂ > 0 where I is a positive integer, Γ = 0,1,2, ..., L represents the reciprocal of the PT-RS symbol level time domain density, Hi represents the quantity symbols following the second symbol, H2 represents the first difference foregoing, l ₀ is the index of ^the first symbol of the front loading door DMRS, and I _dm -rs represents the last symbol index to the front loading door DMRS .
[0038] With reference to the first aspect or the second aspect, in some optional modalities, a mapping priority of the phase tracking reference signal (PT-RS) can be lower than that of at least one of the following: one physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a synchronization signal block, SS block, a reference information signal channel state (channel state information reference signal, CSI-RS), a polling reference signal (Sounding Reference Signal, SRS), a demodulation reference signal (DMRS), and the like. In other words, PT-RS is not mapped to a resource to which any of the preceding signals needs to be mapped. In this way, mapping priorities of PT-RS and other reference signals and physical channels are determined and, therefore, when a resource conflict occurs between PT-RS and the other reference signals and physical channels, the conflict can be avoided in a default way of mapping the PT-RS.
[0039] According to a third aspect, this application provides a method of signal transmission. The method is applied to a device side
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11/82 network. The method includes: sending, via a network device, the first indication information, where the first indication information indicates, in this document, a location of a time-frequency resource occupied by at least two groups of first indication signals. reference, and antenna ports associated separately with at least two groups of first reference signals are not quasi-colocalized; and then send, via the network device, a data signal, in which the data signal is not mapped to the time-frequency resource occupied by at least two groups of first reference signals.
[0040] According to a fourth aspect, this application provides a method of signal transmission. The method is applied to a terminal device side. The method includes: receiving, through a terminal device, the first indication information, in which the first indication information indicates a location of a time-frequency resource occupied by at least two groups of first reference signals, and antennas associated separately with at least two groups of first reference signals are not quasi-colocalized; then, determine, by means of the terminal device, based on the first indication information, the time-frequency resource occupied by at least two groups of first reference signals; and receiving, through the terminal device, a data signal, in which the data signal is not mapped to the time-frequency resource occupied by at least two groups of first reference signals.
[0041] According to the signal transmission method described in the third and fourth aspects, in a non-coherent joint transmission (NCJT) scenario, rate matching can be performed on data (ie , the data is not mapped) to a resource where another transmission and reception point (TRP) sends a PT-RS. This can avoid PT-RS interference caused by data sent by different transmission and reception points, thus ensuring PT-RS phase noise estimation performance.
[0042] With reference to the third aspect or the fourth aspect, in some optional modalities, the first indication information (higher layer signaling or a joint indication of higher layer signaling and physical layer signaling) may include first
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12/82 information and second information. The first information is used to determine a subcarrier occupied by a PT-RS, and the second information is used to determine a symbol occupied by the PT-RS. Specifically, the first information may include at least one of the following: PT-RS transmission enable information, indication information for a DMRS port that is in a DMRS port group and that is associated with an antenna port PT-RS, indication information for a DMRS port group or information indicating an association relationship between a PT-RS frequency domain density and a programmable bandwidth threshold. Specifically, the second information may include information indicating an association relationship between a PT-RS time domain density and an MCS threshold.
[0043] With reference to the third aspect or the fourth aspect, in some optional modalities, a subcarrier occupied by the first reference signals includes a subcarrier in a frequency domain density that corresponds to a maximum programmable bandwidth that is programmed by a third device to a fourth device.
[0044] With reference to the third aspect or the fourth aspect, in some optional modalities, a symbol occupied by the first reference signs includes a symbol in a time domain density that corresponds to a maximum modulation and coding scheme that is programmed by third device to the fourth device.
[0045] According to a fifth aspect, this application provides a communications device. The communications apparatus may include a plurality of function modules, configured to correspondingly carry out the method provided in the first aspect or the method provided in any of the possible implementations of the first aspect.
[0046] According to a sixth aspect, this application provides a communications device. The communications apparatus may include a plurality of function modules, configured to correspondingly carry out the method provided in the second aspect or the method provided in any of the possible implementations of the second aspect.
[0047] According to a seventh aspect, this request provides a
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13/82 communications device, configured to carry out the signal transmission method described in the first aspect. The communications device may include a memory, and a processor and transceiver that are coupled to the memory. The transceiver is configured to communicate with another communications device. The memory is configured to store implementation code for the signal transmission method described in the first aspect. The processor is configured to execute program code stored in memory, that is, perform the method provided in the first aspect or the method provided in any of the possible implementations of the first aspect.
[0048] In accordance with an eighth aspect, this application provides a communications device, configured to carry out the signal transmission method described in the first aspect. The communications device may include a memory, and a processor and transceiver that are coupled to the memory. The transceiver is configured to communicate with another communications device. The memory is configured to store implementation code for the signal transmission method described in the first aspect. The processor is configured to execute program code stored in memory, that is, perform the method provided in the first aspect or the method provided in any of the possible implementations of the first aspect.
[0049] According to a ninth aspect, this application provides a chip. The chip can include a processor, and one or more interfaces coupled to the processor. The processor can be configured to: invoke, from a memory, a program to implement the signal transmission method provided in the first aspect or the signal transmission method provided in any of the possible implementations of the first aspect, and perform a instruction included in the program. The interface can be configured to output a processor processing result.
[0050] According to a tenth aspect, this order provides a chip. The chip can include a processor, and one or more interfaces coupled to the processor. The processor can be configured to: invoke, from a memory, a program to implement the signal transmission method provided in the first aspect or the signal transmission method provided in any of the possible implementations of the first aspect, and perform a instruction included in the program. The interface can be configured to emit
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14/82 a result of processing the processor.
[0051] According to an eleventh aspect, this application provides a network device. The network device may include a plurality of function modules, configured to correspond, correspondingly, to the method provided in the third aspect or the method provided in any of the possible implementations of the third aspect.
[0052] According to a twelfth aspect, this application provides a terminal device. The terminal device can include a plurality of function modules, configured to correspondingly carry out the method provided in the fourth aspect or the method provided in any of the possible implementations of the fourth aspect.
[0053] According to a thirteenth aspect, this application provides a network device, configured to carry out the signal transmission method described in the third aspect. The network device may include a memory, and a processor and transceiver that are coupled to the memory. The transceiver is configured to communicate with another communications device (for example, a terminal device). The memory is configured to store the implantation code of the signal transmission method described in the third aspect. The processor is configured to execute program code stored in memory, that is, perform the method provided in the third aspect or the method provided in any of the possible implementations of the third aspect.
[0054] According to a fourteenth aspect, this application provides a terminal device, configured to carry out the signal transmission method described in the fourth aspect. The terminal device can include a memory, and a processor and a transceiver that are coupled to the memory. The transceiver is configured to communicate with another communications device (for example, a terminal). The memory is configured to store the implantation code of the signal transmission method described in the fourth aspect. The processor is configured to execute program code stored in memory, that is, perform the method provided in the fourth aspect or the method provided in any of the possible implementations of the fourth aspect.
[0055] According to a fifteenth aspect, this application provides a chip. The chip can include a processor, and one or more coupled interfaces
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15/82 to the processor. The processor can be configured to: invoke, from a memory, a program to implement the signal transmission method provided in the third aspect or the signal transmission method provided in any of the possible implantations of the third aspect, and perform a instruction included in the program. The interface can be configured to output a processor processing result.
[0056] According to a sixteenth aspect, this application provides a chip. The chip can include a processor, and one or more interfaces coupled to the processor. The processor can be configured to: invoke, from a memory, a program to implement the signal transmission method provided in the fourth aspect or the signal transmission method provided in any of the possible implantations of the fourth aspect, and perform a instruction included in the program. The interface can be configured to output a processor processing result.
[0057] According to a seventeenth aspect, this application provides a wireless communications system, which includes a first device and a second device. The first device can be configured to carry out the signal transmission method provided in the first aspect or the signal transmission method provided in any of the possible implementations of the first aspect. The second device can be configured to carry out the signal transmission method provided in the second aspect or the signal transmission method provided in any of the possible implementations of the second aspect.
[0058] Specifically, the first device may be the communications apparatus described in the fifth aspect or the seventh aspect, and the second device may be the communications apparatus described in the sixth aspect or the eighth aspect.
[0059] In accordance with an eighteenth aspect, this application provides a wireless communications system, which includes a terminal device and a network device. The terminal device can be configured to carry out the signal transmission method provided in the third aspect or the signal transmission method provided in any of the possible deployments of the third aspect. The network device can be configured to perform the signal transmission method provided in the fourth aspect or the
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16/82 signal transmission provided in any of the possible deployments of the fourth aspect.
[0060] Specifically, the network device can be the network device described in the eleventh or in the thirteenth aspect, and the terminal device can be the terminal device described in the twelfth or the fourteenth aspect.
[0061] According to a nineteenth aspect, a computer-readable storage medium is provided. The readable storage media stores program code to implement the signal transmission method provided in the first aspect or the signal transmission method provided in any of the possible implementations of the first aspect. The program code includes an executable instruction to carry out the signal transmission method provided in the first aspect or the signal transmission method provided in any of the possible implementations of the first aspect.
[0062] According to a twentieth aspect, a computer-readable storage medium is provided. The readable storage media stores program code to implement the signal transmission method provided in the second aspect or the signal transmission method provided in any of the possible implementations of the second aspect. The program code includes an executable instruction to carry out the signal transmission method provided in the second aspect or the signal transmission method provided in any of the possible implementations of the second aspect.
[0063] According to a twenty-first aspect, a computer-readable storage medium is provided. The readable storage media stores program code to implement the signal transmission method provided in the third aspect or the signal transmission method provided in any of the possible implementations of the third aspect. The program code includes an executable instruction to perform the signal transmission method provided in the third aspect or the signal transmission method provided in any of the possible implementations of the third aspect.
[0064] According to a twenty-second aspect, a media of
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17/82 computer-readable storage is provided. The readable storage media stores program code to implement the signal transmission method provided in the fourth aspect or the signal transmission method provided in any of the possible fourth aspect deployments. The program code includes an executable instruction to carry out the signal transmission method provided in the fourth aspect or the signal transmission method provided in any of the possible implementations of the fourth aspect.
BRIEF DESCRIPTION OF THE DRAWINGS [0065] To more clearly describe the technical solutions in the modalities of the present invention or in the background, the following is a brief description of the accompanying drawings necessary to describe the modalities of the present invention or the background.
[0066] Figure 1 is a schematic diagram of a time domain PT-RS mapping rule in the prior art;
[0067] Figure 2 is a schematic diagram of mapping a PDSCH to a symbol that precedes a DMRS;
[0068] Figure 3 is a schematic architectural diagram of a wireless communications system, according to this request;
[0069] Figure 4 is a schematic diagram of a terminal's hardware architecture, according to one modality of this order;
[0070] Figure 5 is a schematic diagram of a hardware architecture of a network device, according to one embodiment of this request;
[0071] Figure 6 is a schematic diagram of a DMRS resource mapping, according to this request;
[0072] Figure 7 is a schematic diagram of a time-frequency resource, according to this request;
[0073] Figure 8 is a schematic flowchart of a signal transmission method, according to this request;
[0074] Figure 9A to Figure 9L are schematic diagrams of time domain PT-RS mapping rules, according to one modality of this request;
[0075] Figure 10A to Figure 10L are schematic diagrams of
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18/82 time domain PT-RS mapping rules, according to another modality of this request;
[0076] Figure 11A to Figure 11C are schematic diagrams of time domain PT-RS mapping rules, according to yet another modality of this request;
[0077] Figure 12A to Figure 12D are schematic diagrams of time domain PT-RS mapping rules, according to yet another modality of this request;
[0078] Figure 13 is a schematic diagram of a non-coherent joint transmission scenario, according to this request;
[0079] Figure 14 is a schematic flow chart of another method of signal transmission, according to this request;
[0080] Figure 15 is a schematic flowchart of yet another signal transmission method, according to this request;
[0081] Figure 16 is a functional block diagram of a wireless communications system and related devices, in accordance with this request;
[0082] Figure 17 is a functional block diagram of another wireless communication system and related devices, in accordance with this request;
[0083] Figure 18 is a schematic structural diagram of an appliance, according to this request; and [0084] Figure 19 is a schematic structural diagram of an appliance, according to this application.
DESCRIPTION OF THE MODALITIES [0085] The terms used in an implementation part of this request are used only to interpret specific modalities of this request, and are not intended to limit this request.
[0086] Figure 3 shows a wireless communications system in this order. The wireless communications system can operate in a high frequency band, and is not limited to a long term evolution system (Long Term Evolution, LTE), but it can be, alternatively, a future mobile communications system evolved from 5 ^the generation (the 5th Generation, 5G), a new radio system (NR), a machine-to-machine communications system (Machine-to-Machine, M2M) or similar. As shown in Figure
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19/82
3, the wireless communications system 100 may include: one or more network devices 101, one or more terminals 103 and a core network 115.
[0087] The network device 101 can be a base station. The base station can be configured to communicate with one or more terminals, or it can be configured to communicate with one or more base stations with some terminal functions (for example, communication between a base station and a micro station- base, such as an access point). The base station can be a base transceiver station (Base Transceiver Station, BTS) in a time division synchronous code division multiple access system (Time Division Synchronous Code Division Multiple Access, TD-SCDMA); or it can be an evolved NodeB (Evolved Node B, eNB) in an LTE system, or a base station in a 5G system or a new radio (NR) system. Alternatively, the base station may be an access point (Access Point, AP), a transmit and receive point (TRP), a central unit (Central Unit, CU) or another network entity, and may include some or all the functions of these network entities.
[0088] Terminal 103 can be distributed throughout the wireless communication system 100, and can be stationary or in motion. In some embodiments of this application, terminal 103 may be a mobile device, a mobile station, a mobile unit, an M2M terminal, a radio unit, a remote unit, a user agent, a mobile or similar client.
[0089] Specifically, the network device 101 can be configured to communicate with terminal 103 through one or more antennas under the control of a network device controller (not shown). In some embodiments, the network device controller can be a part of the core network115, or it can be integrated with network device 101. Specifically, network device 101 can be configured to transmit control information or user data to the network core 115 through a backhaul interface 113 (e.g., an S1 interface). Specifically, network devices 101 can also communicate directly or indirectly with each other through a backhaul (backhaul) interface 111 (for example, an X2 interface).
[0090] The wireless communications system, shown in Figure 3, if
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20/82 is only intended to describe the technical solutions in this application more clearly, and not to limit this request. A person of ordinary skill in the art may know that, with the evolution of network architectures and the emergence of new service scenarios, the technical solutions, provided in the modalities of the present invention, are also applicable to similar technical problems. Figure 3 shows a wireless communications system in this order. The wireless communications system can operate in a high frequency band, and is not limited to a long term evolution system (Long Term Evolution, LTE), but it can be, alternatively, a future mobile communications system evolved from 5 ^the generation (the 5th Generation, 5G), a new radio system (NR), a machine-to-machine communications system (Machine-to-Machine, M2M) or similar. As shown in Figure 3, the wireless communications system 10 can include: one or more network devices 101, one or more terminals 103 and a core network 115.
[0091] The network device 101 can be a base station. The base station can be configured to communicate with one or more terminals, or it can be configured to communicate with one or more base stations with some terminal functions (for example, communication between a base station and a micro station- base, such as an access point). The base station can be a base transceiver station (Base Transceiver Station, BTS) in a time division synchronous code division multiple access system (Time Division Synchronous Code Division Multiple Access, TD-SCDMA); or it can be an evolved NodeB (Evolutional Node B, eNB) in an LTE system, or a base station in a 5G system or a new radio (NR) system. Alternatively, the base station may be an access point (Access Point, AP), a transmission node (Trans TRP), a central unit (Central Unit, CU) or another network entity, and may include some or all of the functions of these network entities.
[0092] Terminal 103 can be distributed throughout the wireless communications system 100, and can be stationary or in motion. In some embodiments of this application, terminal 103 may be a mobile device, a mobile station, a mobile unit, an M2M terminal, a radio unit, a remote unit, a user agent, a mobile or similar client.
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21/82 [0093] Specifically, network device 101 can be configured to communicate with terminal 103 through one or more antennas under the control of a network device controller (not shown). In some embodiments, the network device controller can be a part of core network 115, or it can be integrated with network device 101. Specifically, network device 101 can be configured to transmit control information or user data to the network. core network 115 through a backhaul interface 113 (for example, an S1 interface). Specifically, network devices 101 can also communicate directly or indirectly with each other through a backhaul (backhaul) interface 111 (for example, an X2 interface).
[0094] The wireless communications system, shown in Figure 3, is only intended to more clearly describe the technical solutions in this order, and not to limit this order. A person of ordinary skill in the art may know that, with the evolution of network architectures [0095] Figure 4 shows a terminal 200 provided in some modalities of this order. As shown in Figure 4, terminal 200 may include: one or more terminal processor 201, memory 202, communications interface 203, receiver 205, transmitter 206, coupler 207, antenna 208, user interface 209 and input / output modules (which include an audio input / output module 210, a key input module 211, a display 212, and the like). These components can be connected using a 204 bus or in other ways. Figure 4 shows an example in which these components are connected using a bus.
[0096] Communications interface 203 can be used by terminal 200 to communicate with another communications device, for example, a network device. Specifically, the network device can be a network device 300, shown in Figure 8. Specifically, the communications interface 203 can be a long-term evolution (LTE) communications interface (4G), or it can be a communication interface 5G communications or a new future radio communications interface. In addition to a wireless communications interface, terminal 200 can be additionally configured with a wired communications interface 203, for example, a wireless interface.
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22/82 local access network (Local Access Network, LAN).
[0097] Transmitter 206 can be configured to perform transmission processing, for example, signal modulation, on a signal emitted by terminal processor 201. Receiver 205 can be configured to perform reception processing, for example, signal demodulation , in a mobile communication signal received by antenna 208. In some embodiments of this request, transmitter 206 and receiver 205 can be considered a wireless modem. At terminal 200, there can be one or more transmitters 206 and receivers 205. Antenna 208 can be configured to convert electromagnetic energy, in a transmission line, into an electromagnetic wave into free space, or to convert an electromagnetic wave into free space, in electromagnetic energy, in a transmission line. Coupler 207 is configured to divide a mobile communication signal received by antenna 208 into a plurality of signals, and to distribute the signals to a plurality of receivers 205.
[0098] In addition to transmitter 206 and receiver 205, shown in Figure 4, terminal 200 may additionally include other communications components, for example, a GPS module, a Bluetooth module (Bluetooth) and a loyalty module without wireless (Wireless Fidelity, Wi-Fi). In addition to the foregoing wireless communication signals, terminal 200 can additionally support other wireless communication signals, for example, a satellite signal and a short wave signal. In addition to wireless communications, terminal 200 can be additionally configured with a wired network interface (for example, a LAN interface) to support wired communications.
[0099] The input / output modules can be configured to implement interaction between the terminal 200 and a user or an external environment, and can essentially include the audio input / output module 210, the key input module 211 , display 212, and the like. Specifically, the input / output modules may additionally include a camera, a touchscreen, a sensor, and the like. All input / output modules communicate with terminal processor 201 through user interface 209.
[0100] Memory 202 is coupled to terminal processor 201, and is configured to store various software programs and / or a
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23/82 plurality of instructions. Specifically, memory 202 may include high-speed random access memory, and may also include non-volatile memory, for example, one or more magnetic disk storage devices, a flash memory device or other state storage device non-volatile solid. Memory 202 can store an operating system (hereinafter referred to as a system), for example, an integrated operating system, such as Android, iOS, Windows or Linux. Memory 202 can additionally store a network communication program. The network communication program can be used to communicate with one or more auxiliary devices, one or more terminal devices and one or more network devices. Memory 202 can additionally store a user interface program. The user interface program can vividly display the contents of an application program using a graphical operator interface, and receive control operations from a user to the application program using input controls, such as menus, dialog boxes and keys.
[0101] In some embodiments of this request, memory 202 may be configured to store a deployment program, on one side of terminal 200, of a signal transmission method provided in one or more embodiments of this request. For deployments of a resource mapping method provided in one or more modalities of this order, see the subsequent modalities.
[0102] Terminal processor 201 can be configured to read and execute a computer-readable instruction. Specifically, the terminal processor 201 can be configured to invoke a program stored in memory 212, for example, the implantation program, on the terminal side 200, of the resource mapping method provided in one or more embodiments of this application; and execute an instruction included in the program.
[0103] It can be understood that terminal 200 can be terminal 103 in wireless communication system 100, shown in Figure 5, and can be deployed as a mobile device, a mobile station (mobile station), a mobile unit ( mobile unit), a radio unit, a remote unit, a user agent, a mobile client or similar.
[0104] It should be noted that terminal 200, shown in Figure 4, is
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24/82 only one implementation of this modality of this request. In real applications, terminal 200 may alternatively include more or less components. This is not limited in this document.
[0105] Figure 5 shows a network device 300 provided in some embodiments of this application. As shown in Figure 5, network device 300 may include: one or more network device processors 301, memory 302, communications interface 303, transmitter 305, receiver 306, coupler 307 and antenna 308. These components can be connected using a 304 bus or in other ways. Figure 5 shows an example in which these components are connected using a bus.
[0106] Communications interface 303 can be used by network device 300 to communicate with another communications device, for example, a terminal device or another network device. Specifically, the terminal device can be terminal 200, shown in Figure 5. Specifically, communications interface 303 can be a long-term evolution (LTE) communications interface (4G), or it can be a 5G communications interface or a new future radio communications interface. In addition to a wireless communications interface, network device 300 can be additionally configured with a wired communications interface 303 to support wired communications. For example, a backhaul link between a network device 300 and another network device 300 can be a wireless communications connection.
[0107] The transmitter 305 can be configured to perform transmission processing, for example, signal modulation, on a signal emitted by the network device processor 301. The receiver 306 can be configured to perform reception processing, for example, demodulation signal, in a mobile communication signal received by antenna 308. In some embodiments of this order, transmitter 305 and receiver 306 can be considered a wireless modem. In network device 300, there can be one or more transmitters 305 and receivers 306. Antenna 308 can be configured to convert electromagnetic energy, in a transmission line, into an electromagnetic wave in free space, or to convert an electromagnetic wave, into space free, in electromagnetic energy, in a
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25/82 transmission line. The coupler 307 can be configured to divide a mobile communication signal into a plurality of signals, and to distribute the signals to a plurality of receivers 306.
[0108] Memory 302 is coupled to network device processor 301, and is configured to store various software programs and / or a plurality of instructions. Specifically, memory 302 may include high-speed random access memory, and may also include non-volatile memory, for example, one or more magnetic disk storage devices, a flash memory device or other state storage device non-volatile solid. Memory 302 can store an operating system (hereinafter referred to as a system), for example, an integrated operating system, such as uCOS, VxWorks or RTLinux. Memory 302 can additionally store a network communication program. The network communication program can be used to communicate with one or more auxiliary devices, one or more terminal devices and one or more network devices.
[0109] The 301 network device processor can be configured to manage radio channels, deploy calls, establish and remove communication links, provide automatic cell change control for users within a local control area, and the like. Specifically, the 301 network device processor can include: an administration module / communication module (Administration Module / Communication Module, AM / CM) (a switch used for speech channel switching and information exchange), a basic module (Basic Module, BM) (configured to perform call processing, signal processing, radio resource management, radio link management and circuit management functions), a transcoder and submultiplexer (Transcoder and SubMultiplexer, TCSM) (configured to perform multiplexing, demultiplexing and transcoding functions), and the like.
[0110] In this embodiment of this request, the network device processor 301 can be configured to read and execute a computer-readable instruction. Specifically, the network device processor 301 can be configured to invoke a program stored in memory 302, for example, a deployment program, on one side of the network device 300,
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26/82 of a resource mapping method provided in one or more modalities of this application; and execute an instruction included in the program.
[0111] It can be understood that the network device 300 can be the base station 101 in the wireless communications system 100, shown in Figure 5, and can be deployed as a base transceiver station, a wireless transceiver, a set basic service (BSS), extended service set (ESS), NodeB, eNodeB, access point, TRP or similar.
[0112] It should be noted that the network device 300, shown in Figure 5, is just an implementation of this modality of this request. In real applications, network device 300 may alternatively include more or less components. This is not limited in this document.
[0113] Based on the modalities corresponding to the wireless communication system 100, terminal 200 and network device 300, this application provides a method of resource mapping.
[0114] An essential principle of this order may include the following: A phase tracking reference signal (PT-RS) is also mapped to a symbol that carries a data signal and that precedes a symbol that carries a front-loading DMRS (Front loading DMRS). In this way, it can be guaranteed that a PT-RS is also mapped to a symbol to which a data channel is mapped and that precedes a symbol that carries a DMRS, thus guaranteeing phase noise estimation performance.
[0115] In this order, the symbol carrying the front loading DMRS can be called a second symbol. The second symbol is one or more consecutive symbols that carry one DMRS, and the one or more symbols include the one symbol that carries the DMRS.
[0116] As shown in Figure 6, DMRSs can include a front-loading DMRS (front-loading DMRS) and an additional DMRS (additional-DMRS). Front loading DMRS is a DMRS that continuously occupies one or more DMRS symbols with a lower index between DMRS symbols. The additional DMRS is a DMRS different from the front loading DMRS. In this document, a DMRS symbol is a symbol that carries a DMRS.
[0117] For example, in an example shown in Figure 6, symbols
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27/82 of DMRS are a symbol 3, a symbol 4 and a symbol 7. The symbols that carry the front loading DMRS are two consecutive symbols: the symbol 3 and the symbol 4. The symbol 3 is the 1 ^the symbol that carries the DMRS, namely, the 1 ^the DMRS symbol. This example is used only to explain this request, and should not be construed as a limitation.
[0118] In this order, a mapping priority of a phase tracking reference signal (PT-RS) may be lower than that of at least one of the following: a physical downlink control channel (PDCCH), a physical uplink control channel, PUCCH, a synchronization signal block, SS block, a channel state information reference signal, CSI -RS), a sounding reference signal (SRS), a demodulation reference signal (DMRS), and the like. In other words, PT-RS is not mapped to a resource to which any of the preceding signals needs to be mapped. In this way, mapping priorities of PT-RS and other reference signals and physical channels are determined and, therefore, when a resource conflict occurs between PT-RS and the other reference signals and physical channels, the conflict can be avoided in a default way of mapping the PT-RS.
[0119] In this application, the mapping of PT-RS can include the following two parts:
[0120] 1. PT-RS mapping in a symbol that carries the data signal and that precedes the second symbol (the symbol that carries the front loading DMRS).
[0121] 2. PT-RS mapping in a symbol that carries the data signal and that follows the second symbol (the symbol that carries the front loading DMRS).
[0122] In this document, a symbol that precedes the second symbol is a symbol whose index is less than an index of the second symbol, and a symbol that follows the second symbol is a symbol whose index is greater than the index of the second symbol . For example, in the example shown in Figure 6, the second symbol includes the symbol 3 and the symbol 4, symbols that precede the second symbol are symbols 0 to 2, and symbols that follow the second symbol
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28/82 are symbols 5 through 13. This example is used only to explain this request, and should not be construed as a limitation.
[0123] (1) E-RS time domain mapping rule for a symbol that precedes the second symbol [0124] According to a first mapping rule, the PT-RS is mapped to the first symbol that carries the data signal and preceding the second symbol. In other words, the PT-RS mapping starts from the first symbol of a data channel (PUSCH / PDSCH). In this way, it can be guaranteed that the PT-RS is also mapped to a symbol to which a data channel is mapped and which precedes the second symbol, thus guaranteeing phase noise estimation performance. Modality 1 and Modality 2 subsequently describe this mapping mode in detail. The details are not described in this document.
[0125] According to a second mapping rule, an index of a symbol that is used to carry the PT-RS and that precedes the second symbol is related to a first difference. The first difference (H2) is a difference between an index (L ₀₎ of ^the first DMRS symbol port and the first index symbol which carries the data signal. In other words, the index of the symbol that is used to carry the PT-RS and that precedes the second symbol is related to the difference between the index of the 1 ^the data channel symbol and the index of the 1 ^the symbol that bears the DMRS and preceding the second symbol. Mode 3 subsequently describes this mapping method in detail. The details are not described in this document.
[0126] In addition to the two preceding modes, the PT-RS can be mapped, additionally, in another way, to a symbol that carries the data signal and that precedes the second symbol. This is not limited in this order.
[0127] (2) Time domain PT-RS mapping rule on a symbol that follows the second symbol [0128] According to a first mapping rule, an index of an initial symbol for which 0 PT-RS is mapped and following the second symbol can be determined based on a PT-RS time domain density. In addition, in ascending order of symbol index values, PT-RS is mapped to a symbol with a lower index between each L symbols. L is a reciprocal of the time domain density of PT-RS.
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29/82 [0129] For example, in an example shown in Figure 1, if the time domain density of the PT-RS is 1, the initial symbol to which the PT-RS is mapped is the 1 ^the symbol that follows the second symbol, namely the symbol 3. If the PT-RS time domain density is 1/2, the starting symbol for which the PT-RS is mapped is the second symbol that follows the second symbol, namely, the symbol 4. If the time domain density of the PT-RS is 1/4, the initial symbol to which the PT-RS is mapped is the 1 ^the symbol that follows the second symbol, namely, the symbol 3. This example is used only to explain this request, and should not be construed as a limitation. In real applications, the time domain density of the PT-RS and a mapping relationship between the time domain density of the PT-RS and the index of the initial symbol to which the PT-RS is mapped can alternatively be many different. This is not limited in this order.
[0130] Specifically, the time domain density of PT-RS can be related to at least one among a type of CP, a subcarrier spacing and a modulation and coding scheme. Consult the subsequent content. The details are not described in this document.
[0131] Specifically, the time domain density of the PT-RS and the mapping relationship between the time domain density of the PT-RS and the index of the initial symbol to which the PT-RS is mapped can be predefined by a protocol, or can be configured by a network device using higher layer signaling (for example, RRC signaling) or a PDCCH.
[0132] According to a second mapping rule EN-RS mapping starts from the first symbol of a shared data physical channel (PDSCH / PUSCH), and PT-RS is mapped uniformly to symbols time domain (which include the second symbol, a symbol that precedes the second symbol, and a symbol that follows the second symbol) in a time domain unit. In this way, the PTRS is also mapped, uniformly, to the symbol that follows the second symbol. Optionally, a PT-RS mapping priority is less than that of a PDCCH, PUCCH, SS block, CSI-RS, SRS or similar. Mode 1 subsequently describes this mapping method in detail. The details are not described in this document.
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30/82 [0133] According to a third mapping rule, PT-RS is mapped to the last symbol that carries the data signal and that follows the second symbol, and is mapped, uniformly, to a symbol that follows the second symbol in decreasing order of symbol index values. Mode 2 subsequently describes this mapping mode in detail. The details are not described in this document.
[0134] According to a fourth mapping rule, an index of a symbol that is used to carry the PT-RS and that follows the second symbol is related to a number of symbols that follow the second symbol. Mode 3 subsequently describes this mapping mode in detail. The details are not described in this document.
[0135] PT-RS can be mapped, uniformly, to the symbol that follows the second symbol in all four previous mapping modes. In addition to the four preceding modes, PT-RS can be mapped, additionally, in another way, to the symbol that follows the second symbol. This is not limited in this order.
[0136] In this order, the PT-RS may have the same time domain density or different time domain densities in locations before and after the second symbol.
[0137] A resource described in this application is a time-frequency resource, includes a time domain resource and a frequency domain resource, and is normally represented using a resource element (Resource Element, RE), a block of resource (Resource Block, RB), a symbol (symbol), a subcarrier (subcarrier) or a transmission time interval (Transmission Time Interval, TTI). As shown in Figure 7, an entire system resource includes grids obtained through division into frequency domain and time domain. A grid represents an RE, and an RE includes a subcarrier in the frequency domain and a symbol in the time domain. A RB includes T (T is a positive integer) consecutive symbols in the time domain and Μ (M is a positive integer) consecutive subcarriers in the frequency domain. For example, in LTE, T = 7, and M = 12.
[0138] In this order, symbol index values correspond to sequences of time in ascending order. In other words, in time sequences, a symbol with a lower symbol index value precedes a
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31/82 symbol with a higher symbol index value. Correspondence between a symbol index and a specific deployment time sequence is not limited in this order. For example, symbol index values may alternatively correspond to time strings in descending order.
[0139] It should be noted that the accompanying drawings provided in this application are only intended to explain the modalities of the present invention, and a size of a resource block, a number of symbols and subcarriers included in a resource block, and the like can be different in a future communication standard. The resource block described in this application is not limited to that shown in the attached drawings.
[0140] Based on the preceding invention principle, Figure 8 shows a general process of a signal transmission method provided in this application. The details are described below.
[0141] S101. A first device maps a first reference signal (PT-RS) to a first symbol. With reference to the principle of the foregoing invention, it can be learned that the first symbol includes a symbol that carries a data signal and whose index is less than an index of a second symbol (a symbol that carries a front-loading DMRS). The second symbol is one or more consecutive symbols that carry a DMRS. The one or more symbols include the 1 ^the symbol that bears the DMRS.
[0142] Specifically, the first device can map PT-RS in time domain based on a PTRS time domain density and according to a time domain PT-RS mapping rule predefined by a protocol. For a time domain PT-RS mapping rule on a symbol that precedes the second symbol and a time domain PT-RS mapping rule on a symbol that follows the second symbol, see the antecedent prevention principle and subsequent modalities. The details are not described in this document.
[0143] S102. The first device sends the first reference signal (PT-RS) to a second device. Correspondingly, the second device receives the first reference signal (PT-RS) sent by the first device. Specifically, the second device can determine a symbol that carries the first reference signal (PT-RS) (namely, the first symbol) based on the time domain density of the first signal.
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32/82 reference (PT-RS) and according to a time domain PT-RS mapping rule configured using higher layer signaling or statically defined by a protocol, and receive the first reference signal (PT -RS) in these time domain symbols.
[0144] S103. The second device performs phase tracking based on the first reference signal (PT-RS).
[0145] Specifically, the time domain PT-RS mapping rule can be configured using the higher layer signaling or statically defined by the protocol. The symbols to which the first reference signal (PT-RS) is mapped can be determined based on the time domain density of the first reference signal (PT-RS) (see subsequent Mode 1). Alternatively, symbols to which the first reference signal (PT-RS) is mapped can be determined based on the time domain density of the first reference signal (PTRS) and a location of the symbol carrying the front-loading DMRS ( namely, the second symbol) (see subsequent Mode 2 and Mode 3).
[0146] Specifically, the time domain density of PT-RS can be related to at least one among a type of CP, a subcarrier spacing and a modulation and coding scheme (MCS). Specifically, the first device need not additionally notify the second device of the time domain density of the PT-RS, and the second device can determine the time domain density of the PT-RS based on at least one among the type of CP, the subcarrier spacing and the modulation and coding scheme (MCS). Specifically, the symbol carrying the front-loading DMRS can learn the location of the second symbol from a DMRS resource model (a protocol defines DMRS resource models used for different antenna ports). Specifically, the first device need not additionally notify the second device of the location of the second symbol, and the second device can determine the location of the second symbol based on a DMRS antenna port.
[0147] Thus, if the time domain PT-RS mapping rule is configured using the higher layer signaling or
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33/82 statically defined by the protocol, the first device does not need to perform additional notification, and the second device can determine a symbol that carries the first reference signal (PT-RS) based on another parameter (for example, a port MCS antenna or a DMRS). This can significantly reduce signal overloads.
[0148] It should be understood that, in an uplink transmission process, the first device can be a terminal device, and the second device can be a network device. In a downlink transmission process, the first device can be a network device, and the second device can be a terminal device. Optionally, both the first device and the second device can be terminal devices or network devices.
[0149] According to the signal transmission method, shown in Figure 8, the first reference signal (PT-RS) is mapped to a symbol that precedes the symbol that carries the front loading DMRS. Therefore, it can be ensured that the PT-RS is also mapped to a symbol to which a data channel is mapped and that precedes a symbol that carries a DMRS, thus guaranteeing phase noise estimation performance.
[0150] The following is a description of how to map a PT-RS in time domain using a plurality of modalities.
(1) Mode 1 [0151] In this mode, a PT-RS is mapped to the 1st symbol, in a time domain unit, which carries a data signal (PDSCH / PUSCH). Optionally, in the time domain unit, in ascending order of symbol index values, PT-RS is mapped to a symbol with a lower index between each L symbols. In other words, starting from the 1st symbol that carries the data signal, PT-RS can be mapped, uniformly, within the time domain unit. L is a reciprocal of a PTRS symbol level time domain density. A value of L can be determined based on the PT-RS symbol level time domain density. For example, the value can be {1,2, 4}.
[0152] In this order, the time domain unit can be a slot, an aggregate slot, a subframe, a transmission time interval (Transmission Time Interval, TTI), or similar.
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34/82 [0153] In this modality, an index l of a symbol that carries the PTRS can be expressed using the following formula:
First I _ I I | · ^{1 - "x 1} day ^{+ L} i ¹ first where ¹ is a positive integer, l '= 0,1,2, ..., ^data is an index of ^the symbol door 1 the data signal (PDSCH / PUSCH), and L represents the reciprocal of the PT-RS symbol level time domain density.
[0154] In this modality, a PT-RS mapping priority is less than that of at least one of the following: a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH) , a sync signal block (SS block), a channel status information reference signal (CSI-RS), a poll reference signal (SRS), a demodulation reference signal (DMRS) and a channel diffusion physics (PBCH). In this document, the fact that the mapping priority is less than that of the PDCCH / PUCCH / SS / CSIRS / SRS / DMRS block means: According to a PT-RS mapping rule of time domain or frequency domain , if special signals, such as PDCCH / PUCCH / SS / CSI-RS / SRS / DMRS block also need to be mapped to a resource element (RE) to which PT-RS needs to be mapped, PT-RS it is not mapped to the resource element. It can be understood that, if these special signs are mapped to a symbol with a lower index between each L symbols, PT-RS is not mapped to an RE to which these special signs are mapped. It can be understood that, according to the time domain PT-RS mapping rule, if these special signals are mapped to all subcarriers in one or more symbols to which the PT-RS needs to be mapped, PT -RS is not mapped to the one or more symbols.
[0155] Optionally, according to the PT-RS mapping rule of time domain or frequency domain, if special signals, such as PDCCH / PUCCH / SS / CSI-RS / SRS / DMRS block also need to be mapped to the resource element (RE) to which the PT-RS is mapped, a zero-power PT-RS (ZP-PT-RS) or a mute PT-RS (MutedPT-RS) is sent on feature element.
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35/82 [0156] Downlink transmission is used as an example. Figure 9A to Figure 9L and Figure 10A to Figure 10L show examples of schematic diagrams of a time domain PT-RS mapping rule provided in this embodiment. Figure 9Aà Figure 9L and Figure 10Aà Figure 10L show examples of several typical schematic diagrams of PT-RS mapping obtained through mapping according to the time domain PT-RS mapping rule provided in this modality under different configurations of DMRS, PDCCH configurations or PDSCH configurations.
[0157] In the examples shown in Figure 9A to Figure 9L, a time domain density of PT-RS is 1/2, that is, L = 2. Next, descriptions are provided using Figure 9A and Figure 9B as an example. The time domain PT-RS mapping in Figure 9C to Figure 9L can be learned from the figures. The details are not described in this document.
[0158] As shown in Figure 9A, a front-loading DMRS is mapped to a symbol 3, that is, a second symbol is the symbol 3. An additional DMRS is mapped to a symbol 7. A PDCCH and a PDSCH share the symbols 0 to 2, that is, symbols that precede the symbol that carries the front loading DMRS, in a frequency division multiplexing mode. The PDSCH is not mapped to the last five symbols (namely, symbols 9 through 13) in a time domain unit (namely, a slot). In other words, symbols 9 to 13 do not carry a downlink data signal. In an example shown in Figure 9A, in the time domain unit (ie, slot), the PT-RS is mapped to the first symbol that carries a data signal (namely, the symbol 0). In addition, in ascending order of symbol indexes, PT-RS is mapped to a symbol with a lower index between each two (L = 2) symbols. Finally, PT-RS is mapped to symbol 0, symbol 2, symbol 4, symbol 6 and symbol 8.
[0159] As shown in Figure 9B, a front-loading DMRS is mapped to a symbol 2, that is, a second symbol is the symbol 2. An additional DMRS is mapped to a symbol 7. A PDCCH and a PDSCH share the symbols 0 and 1, that is, symbols that precede the symbol that carries the front loading DMRS, in a multiplexing mode by
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36/82 frequency division. The PDSCH is not mapped to the last five symbols (namely, symbols 9 through 13) in a time domain unit (namely, a slot). In other words, symbols 9 to 13 do not carry a downlink data signal. In an example shown in Figure 9B, in the time domain unit (ie, slot), the PT-RS is mapped to the first symbol that carries a data signal (namely, the symbol 0). In addition, in ascending order of symbol indexes, PT-RS is mapped to a symbol with a lower index between each two (L = 2) symbols. Finally, PT-RS needs to be mapped to symbol 0, symbol 2, symbol 4, symbol 6 and symbol 8. DMRS needs to be mapped to symbol 2, and a DMRS mapping priority is higher than that of PT-RS. Therefore, PT-RS is not actually mapped to symbol 2.
[0160] In the examples shown in Figure 10A to Figure 10L, a time domain density of PT-RS is 1/4, that is, L = 4. Next, descriptions are provided using Figure 10A and Figure 10B as examples. The time domain PT-RS mapping in Figure 10C to Figure 10L can be learned from the figures. The details are not described in this document.
[0161] As shown in Figure 10A, a front-loading DMRS is mapped to a symbol 3, that is, a second symbol is the symbol 3. An additional DMRS is mapped to a symbol 7. A PDCCH and a PDSCH share the symbols 0 to 2, that is, symbols that precede the symbol that carries the front loading DMRS, in a frequency division multiplexing mode. The PDSCH is not mapped to the last five symbols (namely, symbols 9 through 13) in a time domain unit (namely, a slot). In other words, symbols 9 to 13 do not carry a downlink data signal. In an example shown in Figure 10A, in the time domain unit (ie, slot), the PT-RS is mapped to the first symbol that carries a data signal (namely, the symbol 0). In addition, in ascending order of symbol indices, PT-RS is mapped to a symbol with a lower index out of every four (L = 4) symbols. Finally, PT-RS is mapped to symbol 0, symbol 4 and symbol 8.
[0162] As shown in Figure 10B, a front-loading DMRS is mapped to a symbol 3, that is, a second
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37/82 symbol is symbol 3. An additional DMRS is mapped to a symbol 8. A PDCCH and PDSCH share symbols 0 to 2, that is, symbols that precede the symbol that carries the front-loading DMRS, in a mode frequency division multiplexing. The PDSCH is not mapped to the last five symbols (namely, symbols 9 through 13) in a time domain unit (namely, a slot). In other words, symbols 9 to 13 do not carry a downlink data signal. In an example shown in Figure 10B, the unit of time domain (ie, slot), the PT-RS is mapped to the first symbol that carries a data signal (namely, the symbol 0). In addition, in ascending order of symbol indices, PT-RS is mapped to a symbol with a lower index out of every four (L = 4) symbols. Finally, PT-RS needs to be mapped to symbol 0, a symbol 4 and symbol 8. DMRS needs to be mapped to symbol 8, and a DMRS mapping priority is higher than that of PT-RS. Therefore, PT-RS is not actually mapped to symbol 8.
[0163] It should be noted that Figure 9A to Figure 9L and Figure 10A to Figure 10L show only examples of some implementations of this modality. In real applications, a resource (a subcarrier and a symbol) to which a DMRS is mapped, a resource (a subcarrier and a symbol) to which a PDCCH is mapped, a resource (a subcarrier and a symbol) to which a PDSCH is mapped, and the similar may alternatively be different. This should not be interpreted as a limitation.
[0164] It can be learned from the foregoing content that, according to the rule of time domain PT-RS mapping provided in Mode 1, the mapping of PT-RS is started from the 1 ^the symbol of a data channel. It is guaranteed that the PT-RS is also mapped to a symbol to which a data channel is mapped and that precedes the symbol that carries the front-loading DMRS, thus guaranteeing phase noise estimation performance. In addition, PT-RS mapping priorities and special signals, such as other reference signals and physical channels, are determined and, therefore, when a resource conflict occurs between a resource to which PT-RS is mapped and a resource for which special signals, such as other reference signals and physical channels, are mapped, the conflict can be avoided in a way by mapping the PT-RS by default.
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38/82 (2) Mode 2 [0165] In this mode, in a time domain unit, a location of a symbol carrying a PT-RS may be related to a location of a symbol carrying a front-loading DMRS ( namely, a second symbol), and the 1 ^the symbol and the last symbol that carry a data signal (PDSCH / PUSCH). Herein, the first symbol that carries the data signal is a symbol with a lower index of time domain symbols in the unit that carry the data signal (PDSCH / PUSCH). The last symbol that carries the data signal is a symbol with a higher index between symbols in the time domain unit that carry the data signal (PDSCH / PUSCH).
[0166] In this order, the time domain unit can be a slot, an aggregate slot, a subframe, a transmission time interval (Transmission Time Interval, TTI), or similar.
[0167] Specifically, in the time domain unit, PT-RS can be mapped to the 1st symbol that carries the data signal and that precedes the second symbol (namely, the symbol that carries the front-loading DMRS) . In addition, in ascending order of symbol index values, the PTRS can be mapped to a symbol with a lower index between each L symbols that precede the second symbol. Specifically, starting from the 1 ^the symbol that carries the data signal, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in ascending order of symbol index values. L is a reciprocal of a PT-RS symbol level time domain density. A value of L can be determined based on the PT-RS symbol level time domain density. For example, the value can be {1,2, 4}.
[0168] Specifically, in the time domain unit, PT-RS can be mapped to the last symbol that carries the data signal and that follows the second symbol (namely, the symbol that carries the front-loading DMRS). In addition, in decreasing order of symbol index values, PT-RS can be mapped to a symbol with a higher index between each L symbols that follow the second symbol. Specifically, starting from the last symbol that carries the data signal, PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in decreasing order of symbol index values. L is a reciprocal of a
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39/82 PT-RS symbol level time domain density. A value of L can be determined based on the PT-RS symbol level time domain density. For example, the value can be {1,2, 4}.
[0169] In this modality, an index l of a symbol that carries the PTRS can be expressed using the following formula:
, _ pdata - 1'1 ', if l> Gm-RS “l G + Lr.ifi <i„ where' is a positive integer, V = 0, 1, 2, ..., 1% ™ * is an index of the first symbol which carries the data signal (PDSCH / PUSCH), Iffa is an index of the last symbol which carries the data signal (PDSCH / PUSCH), L represents the reciprocal of the time level field density PT-RS symbol / DM_RS is the last symbol to the front loading door DMRS, and L0 represents the first symbol to the front loading door DMRS. For example, when the DMRS occupies a symbol, Gm-rs θ equal to / 0; or when the DMRS occupies two symbols, Z _D m-rs is equal to ₀ + 1.
[0170] Downlink transmission is used as an example. Figure 11A to Figure 11C show examples of schematic diagrams of a time domain PT-RS mapping rule provided in this embodiment. Figure 11A to Figure 11C show examples of several typical schematic diagrams of PT-RS mapping obtained through mapping according to the time domain PT-RS mapping rule provided in this modality under different DMRS configurations, PDCCH configurations or PDSCH settings.
[0171] In an example shown in Figure 11 A, a time domain density of PT-RS is 1, that is, L = 1.
[0172] As shown in Figure 11A, a front-loading DMRS is mapped to a symbol 1, that is, a second symbol is symbol 1. A PDCCH and a PDSCH share a symbol 0, that is, a symbol that precedes the symbol that carries the front-loading DMRS, in a frequency division multiplexing mode. In an example shown in Figure 11 A, before the symbol 1, the PT-RS is mapped to the 1 ^the symbol that carries a data signal (namely, the 0 symbol). After the symbol 1, the
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PT-RS is mapped to the last symbol that carries the data signal (namely, a 13 symbol), and is mapped to a symbol with a higher index between each (L = 1) symbol in decreasing order of symbol indices . Finally, PT-RS is mapped to symbol 0 and symbols 2 to 13.
[0173] In an example shown in Figure 11B, a time domain density of PT-RS is 1/2, that is, L = 2.
[0174] As shown in Figure 11B, a front-loading DMRS is mapped to a symbol 2, that is, a second symbol is symbol 2. A PDCCH and a PDSCH share a symbol 0 and a symbol 1, that is, symbols that precede the symbol that carries the front loading DMRS, in a frequency division multiplexing mode. In an example shown in Figure 11B, before the symbol 2, PT-RS is mapped to the first symbol that carries a data signal (namely, the symbol 0). After the symbol 2, the PT-RS is mapped to the last symbol that carries the data signal (namely, a symbol 13), and is mapped to a symbol with a higher index between each two (L = 2) symbols in decreasing order of symbol indices. Finally, PT-RS is mapped to symbol 0, a symbol 3, a symbol 5, a symbol 7, a symbol 9, a symbol 11 and the symbol 13.
[0175] In an example shown in Figure 11C, a time domain density of PT-RS is 1/4, that is, L = 4.
[0176] As shown in Figure 11C, a front-loading DMRS is mapped to a symbol 3, that is, a second symbol is symbol 3. A PDCCH and a PDSCH share symbols 0 to 2, that is, symbols that precede the symbol that carries the front loading DMRS, in a frequency division multiplexing mode. In an example shown in Figure 11C, before the symbol 3, the PT-RS is mapped to the first symbol that carries a data signal (namely, the symbol 0). After symbol 3, PT-RS is mapped to the last symbol that carries the data signal (namely, a 13 symbol), and is mapped to a symbol with a higher index out of every four (L = 4) symbols in decreasing order of symbol indices. Finally, PT-RS is mapped to symbol 0, symbol 5, symbol 9 and symbol 13.
[0177] It should be noted that Figure 11A to Figure 11C show only examples of some implementations of this modality. In applications
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41/82 reais, a resource (a subcarrier and a symbol) to which a DMRS is mapped, a resource (a subcarrier and a symbol) to which a PDCCH is mapped, a resource (a subcarrier and a symbol) to the which a PDSCH is mapped, and the like may alternatively be different. This should not be interpreted as a limitation.
[0178] Similar to Modality 1, in this modality, a PT-RS mapping priority is less than that of at least one of the following: a physical downlink control channel (PDCCH), a control channel physical uplink (PUCCH), a synchronization signal block (SS block), a channel status information reference signal (CSI-RS), a poll reference signal (SRS), a reference signal demodulation (DMRS) and a physical diffusion channel (PBCH).
[0179] One can learn from the previous content, according to PT-RS mapping rule time domain provided in Mode 2, the PT-RS mapping starts from the first symbol and from the last symbol of a data channel towards a symbol between them. It is guaranteed that the PT-RS is mapped to an edge symbol of the data channel, thus guaranteeing the interpellation estimation performance of the PT-RS. In addition, it is ensured that the PT-RS is also mapped to a symbol to which a data channel is mapped and which precedes a symbol that carries the front-loading DMRS, thereby ensuring noise estimation performance. phase.
(3) Mode 3 [0180] In this mode, a location of a symbol that carries a PT-RS may be related to a location of a symbol that carries a front-loading DMRS (namely, a second symbol). Optionally, the location of the symbol that bears the PT-RS is additionally related to the symbol that bears the front loading DMRS (namely, the second symbol); a quantity of symbols in a time domain unit, whose symbol rates are smaller than a first index symbol to the front loading door DMRS; and a number of symbols, in the time domain unit, whose symbol indexes are greater than an index of the last symbol that carries the front-loading DMRS.
[0181] In this order, the time domain unit can be a slot,
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42/82 an aggregate slot, a subframe, a transmission time interval (Transmission Time Interval, TTI), or similar.
[0182] Specifically, in the time domain unit, an index of the last symbol that carries the PT-RS and that precedes the second symbol is related to a first difference. In addition, starting from the index of the last symbol that carries the PT-RS, in decreasing order of symbol indexes, the PT-RS is mapped, uniformly, to a symbol that carries a data signal and that precedes the second symbol . Specifically, in the time domain unit, an index of a symbol that carries the PT-RS and that precedes the second symbol is related to the first difference. Herein, the first difference (H2) is a difference between the ratio (L ₀₎ of symbol 1 that the front loading door and an index of the DMRS symbol 1 that carries a data signal (PDSCH / PUSCH). In this document, uniform mapping means performing uniform mapping based on a 1 / L time domain density of PT-RS. L is a reciprocal of a PT-RS symbol level time domain density. A value of L can be determined based on the PT-RS symbol level time domain density. For example, the value can be {1, 2, 4}.
[0183] Specifically, in the unit time domain, an index of ^the first symbol PT-RS port and the second symbol that follows is related to a number of symbols that follows the second symbol. In addition, starting from the index of 1 ^the symbol that carries 0 PT-RS, 0 PT-RS is mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indexes. In this document, uniform mapping means performing uniform mapping based on a 1 / L time domain density of PT-RS. L is a reciprocal of a PT-RS symbol level time domain density. A value of L can be determined based on the PT-RS symbol level time domain density. For example, the value can be {1,2, 4}.
[0184] In this application, the number of symbols following the second symbol can be represented by Hi, the first difference can be represented by H2, the index of the first symbol which carries the front loading DMRS may be represented by L _Q and an index of the last symbol carrying the front-loading DMRS can be represented by I _dm -rs.
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43/82 modality, a location of a symbol that carries the PT-RS is related to Hi and H2. The following are some time domain PT-RS mapping modes.
[0185] (1) The time domain density of PT-RS is 1/2, that is, L = 2.
[0186] If the H1 difference between the index of the last symbol carrying the front loading DMRS and an index of the last symbol carrying the data signal (PDSCH / PUSCH) and following the symbol carrying the front loading DMRS is an odd number, PT-RS is mapped to a symbol whose index is I _dm -rs + 1- Optionally, starting from the symbol whose index is I _dm -rs +1, PT-RS can be mapped, evenly, for a symbol that follows the second symbol in ascending order of symbol indices. If the H2 difference between the index of the 1st symbol that carries the front loading DMRS and an index of the 1st symbol that carries the data signal (PDSCH / PUSCH) and that precedes the front loading DMRS is an odd number, the PT-RS is mapped to a symbol whose index is l ₀ - 1. Optionally, starting from the symbol whose index is l ₀ - 1, PT-RS can be mapped, uniformly, to a symbol that precedes 0 seconds symbol in decreasing order of symbol indices.
[0187] If the H1 difference between the index of the last symbol carrying the front loading DMRS and an index of the last symbol carrying the data signal (PDSCH / PUSCH) and following the symbol carrying the front loading DMRS is an even number, PT-RS is mapped to a symbol whose index is I _DM -rs + 2. Optionally, starting from the symbol whose index is I _DM -rs + 2, PT-RS can be mapped, evenly, for a symbol that follows the second symbol in ascending order of symbol indices. If the H2 difference between the index of the 1 symbol port 0 of front loading DMRS and an index of the first symbol to port 0 data signal (PDSCH / PUSCH) and above the front loading DMRS is an even number, PT-RS is mapped to a symbol whose index is l ₀ - 2. Optionally, starting from the symbol whose index is l ₀ - 2, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0188] (2) The time domain density of PT-RS is 1/4, that is,
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L = 4.
[0189] If the difference Hi between the index of the last symbol carrying the front loading DMRS and an index of the last symbol carrying the data signal (PDSCH / PUSCH) and following the symbol carrying the front loading DMRS is an integer multiple of 4, PT-RS is mapped to a symbol whose index is I _dm -rs + 4. Optionally, starting from the symbol whose index is I _dm -rs + 4, PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indices. If the H2 difference between the index of the 1 ^the symbol that carries the front loading DMRS and an index of the 1 ^the symbol that carries the data signal (PDSCH / PUSCH) and that precedes the front loading DMRS is an integer multiple of 4, PT-RS is mapped to a symbol whose index is l _Q - 4. Optionally, starting from the symbol whose index is l ₀ - 4, the PTRS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0190] If the H1 difference between the index of the last symbol that carries the front loading DMRS and an index of the last symbol that carries the data signal (PDSCH / PUSCH) and that follows the symbol that carries the front loading DMRS Himod4 = 1, PT-RS is mapped to a symbol whose index is I _dm -rs + 1 Optionally, starting from the symbol whose index is I _dm -rs + 1, PT-RS can be mapped, uniformly , for a symbol that follows the second symbol in ascending order of symbol indices. If the H2 difference between the index of the first symbol which carries the front loading DMRS and an index of the first symbol which carries the data signal (PDSCH / PUSCH) and above the front loading DMRS satisfies H2mod4 = 2, the PT-RS is mapped to a symbol whose index is l ₀ - 1. Optionally, starting from the symbol whose index is l ₀ -1, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0191] If the H1 difference between the index of the last symbol that carries the front loading DMRS and an index of the last symbol that carries the data signal (PDSCH / PUSCH) and that follows the symbol that carries the front loading DMRS Himod4 = 2, PT-RS is mapped to a symbol whose index is L _dm -rs + 2. Optionally, starting from the
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45/82 symbol whose index is I _dm -rs + 2, PT-RS can be mapped, uniformly, to a symbol that follows the second symbol in ascending order of symbol indices. If the H2 difference between the index of the first symbol which carries the front loading DMRS and an index of the first symbol which carries the data signal (PDSCH / PUSCH) and above the front loading DMRS satisfies H2mod4 = 2, the PT-RS is mapped to a symbol whose index is l ₀ - 2. Optionally, starting from the symbol whose index is Z _o - 2, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0192] If the H1 difference between the index of the last symbol that carries the front-loading DMRS and an index of the last symbol that carries the data signal (PDSCH / PUSCH) and that follows the symbol that carries the front-loading DMRS Himod4 = 3, PT-RS is mapped to a symbol whose index is I _dm -rs + 3. Optionally, starting from the symbol whose index is I _dm -rs + 3, PT-RS can be mapped, evenly, for a symbol that follows the second symbol in ascending order of symbol indices. If the H2 difference between the index of the first symbol which carries the front loading DMRS and an index of the first symbol which carries the data signal (PDSCH / PUSCH) and above the front loading DMRS satisfies H2mod4 = 3, the PT-RS is mapped to a symbol whose index is l _Q - 3. Optionally, starting from the symbol whose index is l _Q - 3, PT-RS can be mapped, uniformly, to a symbol that precedes the second symbol in decreasing order of symbol indices.
[0193] In this modality, an index l of a symbol that carries the PTRS can be expressed using the following formula:
Pdm-rs + - (H1 - 1Ί xl 4- L · I ', if l> Zdm-rs z = <r _zr „η -1; or
Ho - [H ₂ - (| γ | - 1) X - L Γ, if l <z ₀ , h ₂ > 0, _ 0-dm-rs + U * ^- Hf) mod L] + L 1 ', if l> Idm-rs í Z _o - [L - (--Hftmod L] - L · 1 ', if l <Z _o , H ₂ > 0 where' is a positive integer, Γ = 0,1,2 , ..., L represents the reciprocal of the PT-RS symbol level time domain density, H _± represents the number of symbols following the second symbol, H2 represents the first antecedent difference, Z _o represents the index of the 1 ^the
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46/82 symbol that carries the front-loading DMRS, and I _dm -rs represents the index of the last symbol that carries the front-loading DMRS.
[0194] Downlink transmission is used as an example. Figure 12A to Figure 12D show examples of schematic diagrams of a time domain PT-RS mapping rule provided in this embodiment. Figure 12A to Figure 12D show examples of several typical schematic diagrams of PT-RS mapping obtained through mapping according to the time domain PT-RS mapping rule provided in this modality under different DMRS configurations, PDCCH configurations or PDSCH settings.
[0195] In the examples shown in Figure 12A and Figure 12B, a time domain density of PT-RS is 1/2, that is, L = 2.
[0196] As shown in Figure 12A, a front-loading DMRS is mapped to a symbol 2, that is, a second symbol is symbol 2. A PDCCH and a PDSCH share symbols 0 and
1, that is, symbols that precede the symbol that carries the front-loading DMRS, in a frequency division multiplexing mode. In an example shown in Figure 12A, Hi = 11, and H2 = 2. Before symbol 2, PT-RS is mapped to symbol 0. After symbol 2, PT-RS is mapped to symbol 3, and is mapped to a symbol with a lower index between every two (L = 2) symbols in ascending order of symbol indexes. Finally, PT-RS is mapped to symbol 0, symbol 3, symbol 5, symbol 7, symbol 9, symbol 11 and symbol 13.
[0197] As shown in Figure 12B, a front-loading DMRS is mapped to a symbol 3, that is, a second symbol is symbol 3. A PDCCH and a PDSCH share symbols 0 to
2, that is, symbols that precede the symbol that carries the front-loading DMRS, in a frequency division multiplexing mode. In an example shown in Figure 12A, Hi = 10, and H2 = 3. Before symbol 3, PT-RS is mapped to symbol 2. After symbol 3, PT-RS is mapped to symbol 5, and is mapped to a symbol with a lower index between every two (L = 2) symbols in ascending order of symbol indexes. Finally, PT-RS is mapped to symbol 2, symbol 5, symbol 7, symbol 9, symbol 11 and symbol 13.
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47/82 [0198] In the examples shown in Figure 12C and Figure 12D, a time domain density of PT-RS is 1/4, that is, L = 4.
[0199] As shown in Figure 12C, a front-loading DMRS is mapped to a symbol 1, that is, a second symbol is symbol 1. A PDCCH and a PDSCH share a symbol 0, that is, a symbol that precedes the symbol that carries the front-loading DMRS, in a frequency division multiplexing mode. In an example shown in Figure 12C, Hi = 12, and H2 = 1. Before symbol 1, PT-RS is mapped to symbol 0. After symbol 1, PT-RS is mapped to symbol 5, and is mapped to a symbol with a lower index out of four (L = 4) symbols in ascending order of symbol indices. Finally, PT-RS is mapped to symbol 0, symbol 5, symbol 9 and symbol 13.
[0200] As shown in Figure 12D, a front-loading DMRS is mapped to a symbol 2, that is, a second symbol is symbol 2. A PDCCH and a PDSCH share symbols 0 and 1, that is, symbols that precede the symbol that carries the front loading DMRS, in a frequency division multiplexing mode. In an example shown in Figure 12D, H1 = 11, and H2 = 2. Before symbol 2, PT-RS is mapped to symbol 0. After symbol 2, PT-RS is mapped to symbol 5, and is mapped to a symbol with a lower index out of every four (L = 4) symbols in ascending order of symbol indices. Finally, PT-RS is mapped to symbol 0, symbol 5, symbol 9 and symbol 13.
[0201] It should be noted that Figure 12A to Figure 12D show only examples of some implementations of this modality. In real applications, a resource (a subcarrier and a symbol) to which a DMRS is mapped, a resource (a subcarrier and a symbol) to which a PDCCH is mapped, a resource (a subcarrier and a symbol) to which a PDSCH is mapped, and the similar may alternatively be different. This should not be interpreted as a limitation.
[0202] It can be learned from the background that, according to the time domain PT-RS mapping rule provided in Modality 3, a location of a symbol that bears the DMRS is linked to a
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48/82 location of a symbol that carries the PT-RS, and the location of the symbol that carries the PT-RS can be determined based on a time domain DMRS mapping model, thereby reducing signaling overloads . According to this modality, it can be guaranteed that the PT-RS is mapped to the last symbol of a data channel, thus guaranteeing the interpellation estimation performance of the PT-RS. In addition, it is ensured that the PT-RS is also mapped to a symbol to which a data channel is mapped and which precedes the symbol that carries the front-loading DMRS, thus guaranteeing noise estimation performance. phase.
[0203] In some optional modalities of this request, the higher layer signaling, such as RRC signaling, includes one or more groups of data resource mapping indication information (PDSCH-RE-MappingConfig). The data resource mapping indication information includes identification information (pdsch-REMappingConfigld) of the data resource mapping indication information and related information for a PT-RS time-frequency resource location. For example, the related information may indicate a phase tracking reference signal model (PT-RS pattern) and / or a phase tracking reference signal antenna port (PTRS port).
[0204] A specific signaling deployment is as follows: PDSCH-RE-MappingConfig :: = SEQUENCE {pdsch-RE-MappingConfigld Identification information of the data resource mapping indication information,
PT-RS ports ENUMERATED {7, 8, 9, 10, 11.12, 13, 14, spare 1}, and / or
PT-RS pattern ENUMERATED {pattern 1, pattern 2};
or
PT-RS port group ENUMERATED {group number 1, group number
2, ...}, }
[0205] Based on the implementation of antecedent signaling, ο
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49/82 content included in a data resource mapping indication information type in the RRC signaling is shown. The data resource mapping indication information includes identification information (pdsch-RE-MappingConfigld) from the data resource mapping indication information and related information from a PT-RS time-frequency resource location. In this document, related information includes PT-RS ports and / or a PT-RS model; or a PT-RS port group. In this document, PT-RS ports represent PT-RS antenna port information (for example, antenna port information includes, in this document, an antenna port port number), and the PT model -RS represents a PTRS model; or the PT-RS port group represents information about a PT-RS antenna port group. For related information on the location of the PT-RS time-frequency resource, please refer to the specific descriptions in the context following this request.
[0206] In this mode of this request, optionally, DCIs indicate a specific group of data resource mapping indication information configured using RRC signaling. For example, identification information (for example, pdsch-RE-MappingConfigld) of the data resource mapping indication information configured in the RRC signaling can be indicated by a bit of a data resource mapping field and quasi indicator -colocation (PDSCH RE Mapping and Quasi-Co-Location Indicator, PQI) in the DCI. For a specific deployment, see Table 1. In Table 1, an example is used for a description in which the data resource mapping field and quasi-colocalization indicator is represented using two bits.
Table 1
Data resource mapping field and quasi-location indicator (bit value) description 00 Data resource mapping indication information identifier 1 configured using RRC
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01 Data resource mapping indication information identifier 2 configured using RRC 10 Data resource mapping indication information identifier 3 configured using RRC 11 Data resource mapping indication information identifier 4 configured using RRC
[0207] In this document, the data resource mapping field and quasi-colocalization indicator can also be understood as a specific implementation of second indication information carried in the DCI. The second indication information indicates a corresponding identifier, so that related information, in the RRC signaling and which corresponds to the identifier, of a phase frequency reference location of a phase tracking reference signal can be determined. For example, in the preceding exemplary RRC signaling, the identifying information of the data resource mapping indication information is identifier 1, and bit values of the data resource mapping field and quasi-colocalization indicator in DCI are 00. Therefore, it can be determined that DCIs indicate related information, which corresponds to identifier 1, of a time-frequency resource location of a phase tracking reference signal. Additionally, it can be determined that the related information is the PT-RS ENUMERATED ports {7, 8, 9, 10, 11, 12, 13, 14, additional 1}, and / or the PT-RS ENUMERATED model { model 1, model 2}; or the PT-RS ENUMERATED port group {group number 1, group number 2, ...}.
[0208] It can be understood that a receiving end (namely, the second antecedent device) can obtain the time-frequency resource location of PT-RS in the data resource mapping indication information, and then it can learn that data is not mapped to the location of PT-RS's time-frequency resource. That is, the receiving end does not receive data at the time resource location
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51/82 frequency of PT-RS.
[0209] In addition, this request additionally provides another method of signal transmission. In a non-coherent joint transmission (NCJT) scenario, rate matching can be performed on data (that is, data is not mapped) on a resource where another transmission and reception point (transmission and reception point, TRP) sends a PT-RS. This can avoid PT-RS interference caused by data sent by different transmission and reception points, thus ensuring PT-RS phase noise estimation performance.
[0210] First, the non-coherent joint transmission scenario is described.
[0211] In an LTE system, a TM10 supports transmission / reception from multiple coordinated points (Coordinated multipoint transmission / reception, CoMP). In CoMP, signals can come from a plurality of transmit and receive points. As shown in Figure 13, in the scenario of non-coherent joint transmission (NCJT), different points of transmission and reception can transmit different transmissions of MIMO (MIMO streams) to the same terminal device in the same time-frequency resource.
[0212] To support the transmission / reception of multiple coordinated points (Coordinated multipoint transmission / reception, CoMP), a concept of quasi-co-located (QCL) is introduced, which requires that an antenna port satisfy a limitation specific QCL.
[0213] In CoMP communication, signals can come from a plurality of transmission and reception points (transmission and reception point, TP, or transmission reception point, TRP), and an antenna port on CoMP must satisfy the QCL limitation . A plurality of groups of QCL information may sometimes need to be configured for a network device to notify a terminal device. For example, in a case of non-coherent Joint Transmission, NCJT, different transmit and receive points (for example, network devices) can transmit different transmissions from multiple inputs to multiple outputs (multiple-input multiple- output, MIMO) (MIMO streams) to the same terminal device in the same time-frequency resource on the same carrier. Therefore, a reference signal antenna port of
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52/82 demodulation reference signal, DMRS (sometimes also called DMRS ports), and a channel state information reference signal (CSIRS) antenna port and / or a port PT-RS antenna that are at a first point of transmission and reception are QCL (that is, satisfy a QCL ratio); and a DMRS antenna port, and a CSI-RS antenna port and / or a PT-RS antenna port that are at a second transmit and receive point are QCL. However, an antenna port at the first point of transmission and reception and that at the second point of transmission and reception are not QCL (that is, they do not satisfy a QCL relationship).
[0214] For a definition of QCL in this modality of this request, see a definition in LTE. Specifically, the signals sent by QCL antenna ports are subjected to the same fading on a large scale. Large-scale fading includes one or more of the following: a delay spread, a Doppler spread, a Doppler shift, an average channel gain, an average delay, and the like. Alternatively, for a definition of QCL in this modality of this order, see a definition of QCL in 5G. A definition of QCL on a new NR radio system is similar to that on an LTE system, but spatial information is added. For example, signals sent through QCL antenna ports are subjected to the same fading on a large scale. Large-scale fading includes one or more of the following parameters: a delay spread, a Doppler spread, a Doppler shift, an average channel gain, an average delay, a spatial parameter, and the like. The spatial parameter can be one or more of a departure angle (AOA), a dominant departure angle (Dominant AoA), an average arrival angle (Average AoA), an arrival angle (AOD), a correlation matrix of channel, an azimuthal power spread spectrum of an arrival angle, an average start angle (Average AoD), an azimuthal power spread spectrum of a start angle, a transmission channel correlation, a channel correlation receiving, a transmitting beam formation, a receiving beam formation, a spatial channel correlation, a filter, a spatial filter parameter or a spatial reception parameter.
[0215] The QCL list includes one or more of a
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53/82 channel state information reference signal, CSI-RS, a DMRS, a phase tracking reference signal (PT-RS) (also called a phase compensation reference signal (PCRS) or a phase noise reference signal (called a phase noise reference signal for the sake of brevity)), a synchronization signal block (SS block) (which includes one or more of a sync signal and a broadcast channel, wherein the sync signal includes a primary sync signal PSS and / or a secondary sync signal SSS), and an uplink reference signal (e.g. an uplink probe signal reference signal, SRS, or an uplink DMRS) that satisfy the QCL ratio.
[0216] It can be understood that if a transmission and reception point 2 (TRP2) sends data in a time-frequency resource in which a transmission and reception point 1 (TRP1) sends a PT-RS, when a link backhaul between a plurality of transmit and receive points is a non-ideal backhaul link, the PT-RSs locations of two transmit and receive points cannot be exchanged in time; therefore, the data sent by the transmitting and receiving point 2 (TRP2) interferes with the PT-RS sent by the transmitting and receiving point 1 (TRP1), thereby affecting the performance of a terminal device when receiving the PT-RS. sent by the transmit and receive point 1 (TRP1). Conversely, if the transmit and receive point 1 (TRP1) sends data on a time-frequency resource in which the transmit and receive point 2 (TRP2) sends a PTRS, the data sent by the transmit and receive point 1 (TRP1) ) interfere with the PT-RS sent by the transmission and reception point 2 (TRP2).
[0217] The following is a detailed description of another method of signal transmission to solve the previous technical problem. As shown in Figure 14, details are provided below.
[0218] A network device 1 and a network device 2 exchange sets of PT-RS mapping resources (namely, the first antecedent reference signal). Optionally, network device 2 can send PT-RS information to network device 1 via an X2 interface. PT-RS information is used to determine a time resource
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54/82 frequency occupied by a PT-RS that comes from network device 2, that is, a set of PT-RS mapping device from network device 2. In this document, the set of PT- Network device 2 RS is a time-frequency resource in which network device 2 can transmit a PT-RS. However, network device 2 can transmit PT-RS on only a few resources in the pool, or network device 2 does not actually transmit PT-RS.
[0219] Specifically, network device 1 and network device 2 need to notify each other of their respective PT-RS resource mapping sets, for example, notify each other of the following parameters from each other: enabling information of transmission of a PT-RS, indication information of a DMRS port that is in a DMRS port group and that is associated with an antenna port of a PT-RS, indication information of a DMRS port group , information indicating an association relationship between a frequency domain density of a PT-RS and a programmable bandwidth threshold, information indicating an association relationship between a time domain density of a PT-RS and an MCS threshold, or the like.
[0220] Similarly, network device 1 can also send PT-RS information to network device 2 via interface X2. This is not limited to the present invention.
[0221] S201. Network device 1 (or network device 2) sends first indication information to a terminal device. The first indication information sent by the network device 1 (or by the network device 2) is used to indicate a location of a temperature frequency resource occupied by at least two groups of PT-RSs. Each group of PTRSs has a QCL relationship with another reference signal (for example, a DMRS, a CSI-RS, an SS block or an SRS), and corresponds to a network device. Each group of PT-RSs has a different QCL relationship. In other words, different groups of PT-RSs are not QCL. For example, an antenna port in a PT-RS 1 antenna port group satisfies a first QCL ratio, and an antenna port in a PTRS 2 antenna port group satisfies a second QCL ratio. The first QCL relationship is different from the second QCL relationship. The first QCL interface can
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55/82 correspond to network device 1, and the second QCL relation can correspond to network device 2. In this application, the other reference signal can be called a third reference signal.
[0222] Optionally, the first indication information sent by network device 1 (or network device 2) to the terminal device can be higher layer signaling, or a joint indication of higher layer signaling and signaling physical layer. For example, the first indication information is higher-level signaling. For example, the first indication information is RRC signaling. RRC signaling includes at least two groups of data resource mapping indication information (PDSCH-REMappingConfig). The data resource mapping indication information includes identification information (pdsch-RE-MappingConfigld) of the data resource mapping indication information and related information for a PT-RS time-frequency resource location. Related information may indicate a PT-RS model (PT-RS pattern) and / or a PT-RS antenna port (PT-RS port), or a PT-RS group identifier, or similar.
[0223] A specific signaling deployment is as follows: PDSCH-RE-MappingConfig :: = SEQUENCE {pdsch-RE-MappingConfigld Identification information of the data resource mapping indication information,
PT-RS ports ENUMERATED {7, 8, 9,10,11,12,13,14, spare 1}, and / or
PT-RS pattern ENUMERATED {pattern 1, pattern 2};
or
PT-RS port group ENUMERATED {group number 1, group number 2, ...},}}
[0224] Based on the implementation of antecedent signaling, ο content included in a type of data resource mapping indication information in the RRC signaling is shown. The information
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56/82 data resource mapping indication includes identification information (pdsch-RE-MappingConfigld) of data resource mapping indication information and related information from a PT-RS time-frequency resource location. In this document, related information includes PT-RS ports and / or a PT-RS model; or a PT-RS port group. In this document, PT-RS ports represent PT-RS antenna port information (for example, antenna port information includes, in this document, an antenna port port number), and the PT model -RS represents PT-RS model information; or the PT-RS port group represents information about a PT-RS antenna port group. For related information on the location of the PT-RS time-frequency resource, please refer to the specific descriptions in the context following this request.
[0225] In this mode of this request, optionally, the first indication information can be DCI of physical layer signaling and higher layer signaling. For example, physical layer signaling DCIs indicate a specific group of data resource mapping indication information configured using RRC signaling. For example, the identification information (for example, pdsch-REMappingConfigld) of the data resource mapping indication information configured in the RRC signaling can be indicated by a data resource mapping bit in the DCI. For a specific deployment, see Table 2. In Table 2, an example in which a data resource mapping field and quasi-colocalization indicator is represented using two bits is used for description.
Table 2
Data resource mapping field and quasi-colocalization indicator (bit value) description 00 Data resource mapping indication information identifier 1 configured using RRC
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01 Data resource mapping indication information identifier 2 configured using RRC 10 Data resource mapping indication information identifier 3 configured using RRC 11 Data resource mapping indication information identifier 4 configured using RRC
[0226] For example, in the preceding exemplary RRC signaling, the identifying information of the data resource mapping indication information is identifier 1, and bit values of the data resource mapping field and quasi-colocalization indicator in DCI they are 00. Therefore, it can be determined that DCI indicate related information, which corresponds to identifier 1, of a time-frequency resource location of a phase tracking reference signal. Additionally, it can be determined that the related information is the PT-RS ENUMERATED ports {7, 8, 9, 10, 11, 12, 13, 14, additional 1}, and / or the PT-RS ENUMERATED model { model 1, model 2}; or the PT-RS ENUMERATED port group {group number 1, group number 2, ...}.
[0227] It can be understood that a receiving end (namely, the terminal device) can obtain the location of the frequency-frequency resource of the at least two groups of PT-RSs in the data resource mapping indication information and then , you can learn that data is not mapped to a second DMRS time-frequency resource location. That is, data transmission is not performed at the time-frequency resource location of the second DMRS.
[0228] S202. The terminal device determines the time-frequency resource location of at least two groups of PT-RSs in the data resource mapping indication information based on the first indication information sent by network device 1 (or by the network device 2) and then can learn that data is not mapped to the time-frequency resource location of the second DMRS. That is,
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58/82 data transmission is not carried out at the location of the second DMRS's frequency-frequency resource.
[0229] S203. Network device 1 and / or network device 2 sends a data signal to the terminal device and performs rate matching on a data signal to be sent. Specifically, the data signal is not mapped to the location of the PT-RS time-frequency resource that is indicated by the first indication information. Alternatively, the data signal is mapped to a time-frequency resource location other than the PT-RS time-frequency resource location that is indicated by the first indication information.
[0230] Optionally, the first indication information (higher layer signaling, or a joint indication of higher layer signaling and physical layer signaling) may include first information and second information. The first information is used to determine a sub-carrier occupied by PT-RS, and the second information is used to determine a symbol occupied by PT-RS. Specifically, the first information may include at least one of the following: PT-RS transmission enable information, indication information for a DMRS port that is in a DMRS port group and that is associated with an antenna port PT-RS, indication information for a DMRS port group or information indicating an association relationship between a PT-RS frequency domain density and a programmable bandwidth threshold. Specifically, the second information may include information indicating an association relationship between a PT-RS time domain density and an MCS threshold.
[0231] Optionally, the terminal device can determine a set of PT-RS subcarrier mapping of network device 1 (or network device 2), that is, a set of subcarrier that can be occupied by the network 1 (or network device 2), based on the first information sent by network device 1 (or network device 2). Optionally, the PT-RS subcarrier mapping set of network device 1 (or network device 2) can include (all possible) subcarriers in a frequency domain density that
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59/82 corresponds to the maximum programmable bandwidth programmed by network device 1 for the terminal device. For a relationship between a programmable bandwidth and a frequency domain density, see the descriptions of a PT-RS frequency domain density in subsequent content. The details are not described in this document.
[0232] Optionally, the terminal device can determine a PT-RS symbol mapping set from network device 1 (or from network device 2), that is, a symbol set that can be occupied by the network 1 (or network device 2), based on the second information sent by network device 1 (or network device 2). Optionally, the PT-RS symbol mapping set of network device 1 (or network device 2) can include (all possible) symbols in a time domain density that corresponds to a maximum MCS programmed by the device from network 1 to the terminal device. For a relationship between an MCS and a time domain density, see the descriptions about a time domain density of a PT-RS in subsequent content. The details are not described in this document.
[0233] It should be understood that a sequence of execution of the steps in the previous method is not limited to that shown in Figure 14 and can change alternatively. This is not limited in this order.
[0234] Optionally, when current transmission is non-coherent joint transmission (NCJT), the network device and the terminal device perform rate matching on the previous PT-RS. For example, whether the current transmission is NCJT or not can be determined based on the number of DCIs that require blind detection or the maximum number of DCIs that require blind detection, where the quantity is configured by the network device for UE using RRC signaling and, in addition, whether or not to perform rate matching in PT-RS using the antecedent method is determined. According to another example, the fact that the current transmission is NCJT or not can be indicated using explicit signaling (physical layer DCI signaling, or DCI signaling), and the performance of rate matching in PT-RS using whether the antecedent method is determined. Alternatively, whether or not the current transmission is NCJT
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60/82 can be determined implicitly based on a number of QCL ratios that is indicated by DCI signaling and, additionally, whether or not to perform rate matching on PT-RS using the foregoing method is determined. A method for determining NCJT is not limited in this application.
[0235] In addition to that shown in Figure 14, as shown in Figure 15, network device 1 and network device 2 can alternatively send second indication information to the terminal device separately. Consult S201A and S201B. Specifically, the second indication information sent by network device 1 (or network device 2) is used to indicate a time-frequency resource occupied by a PT-RS that comes from network device 1 (or the network 2). It can be understood that the second indication information sent separately by network device 1 and network device 2 can be used together to indicate the location of the time-frequency resource occupied by at least two PT groups. -RSs mentioned in the embodiment of Figure 14. A PT-RS of the network device 1 and a PT-RS of the network device 2 do not have a QCL relationship.
[0236] For stages other than S201A and S201B, in a Figure 15 modality, refer to Figure 14 modality. Details are not described again in this document.
[0237] The following is a description of ways to determine a time domain density and a frequency domain density of a PT-RS.
[0238] (1) PT-RS time domain density [0239] In this order, the PT-RS time domain density can be related to at least one of a type of cyclic prefix (Cyclic Prefix, CP) , a subcarrier spacing and a modulation and coding scheme.
[0240] Specifically, there is a correspondence between the time domain density of PT-RS and at least one among the type of CP, the subcarrier spacing and the modulation and coding scheme. Different types of CP, subcarrier spacing or modulation and coding schemes correspond to different time domain densities. Specifically, correspondence can be predefined by a
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61/82 protocol, or can be configured by the network device using higher layer signaling (for example, RRC signaling).
[0241] It can be learned, from the previous content, that the time domain density of the PT-RS can include the following types: The PTRS can be mapped, continuously, for each symbol of a PUSCH (or a PDSCH) or each can be mapped to symbol 2 of a PUSCH (or PDSCH), or may be mapped to each symbol 4 of a PUSCH (or PDSCH).
[0242] In this application, the time domain density of the PT-RS can be determined based on the subcarrier spacing and the modulation and coding scheme. Specifically, for a given subcarrier spacing value, one or more modulation and encoding scheme thresholds can be predefined, or can be configured using higher layer signaling. All modulation and coding schemes between two adjacent modulation and coding scheme thresholds correspond to the same PTRS time domain density, as shown in Table 3.
Table 3
Modulation order Time domain density 0 <= MCS <MCS_1 0 MCS_1 <= MCS <MCS_2 1/4 MCS_2 <= MCS <MCS_3 1/2 MCS_3 <= MCS 1
[0243] MCS_1, MCS_2 and MCS_3 are modulation and coding scheme thresholds. Ί, 1/2 and 1/4, in the time domain density, are three time domain densities shown in Figure 1.
[0244] Specifically, at a given subcarrier spacing, the PT-RS time domain density can be determined based on a modulation and encoding scheme threshold range in which an actual MCS modulation and encoding scheme is. For example, supposing that Table 3 shows modulation and coding scheme thresholds in a standard SCS_1 subcarrier spacing = 15 kHz, if the actual MCS modulation and coding scheme is in a range [MCS_2, MCS_3], the domain density PT-RS time is 1/2. This example is used
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62/82 only to explain this embodiment of the present invention, and should not be construed as a limitation.
[0245] In this order, different subcarrier spacing can correspond to different modulation and coding scheme thresholds. Specifically, different correspondence tables of a modulation and coding scheme threshold and a time domain density can be configured for different subcarrier spacing.
[0246] Specifically, modulation and encoding scheme thresholds that correspond to different subcarrier spacing can be predefined by a protocol, or can be configured by the network device using higher layer signaling (for example, RRC signaling) .
[0247] In some optional modalities, a standard subcarrier spacing (expressed as SCS_1), for example, 15 kHz, and one or more standard thresholds (expressed as MCS ') that correspond to the standard subcarrier spacing can be predefined by a protocol , or can be configured using higher layer signaling. In addition, for other non-standard subcarrier spacing, a corresponding modulation and encoding scheme offset (expressed as MCS_offset, which is an integer) can be predefined by a protocol, or can be configured using higher layer signaling . MCS_offset + MCS = MCS ', where MCS represents an actual modulation and coding scheme in the other non-standard subcarrier spacing. In the other non-standard subcarrier spacing, the PT-RS time domain density can be determined by adding the actual MCS modulation and coding scheme to the MCS_offset modulation and coding scheme offset.
[0248] For example, if Table 4 shows modulation and coding scheme thresholds in the standard SCS_1 subcarrier spacing = 15 kHz, in a non-standard 60 kHz subcarrier spacing, if a sum of the actual MCS modulation and encoding scheme and MCS_offset is in an interval [0, MCS_1], the time domain density of PT-RS is 0; or if a sum of the actual modulation and encoding scheme MCS and MCS_offset is in an interval [MCS_1, MCS_2], the time domain density of PT-RS is 1/4. This example is used only to explain this modality of
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63/82 the present invention, and should not be construed as a limitation.
Table 4
Modulation order Time domain density 0 <= MCS '<MCS_1 0 MCS_1 <= MCS '<MCS_2 1/4 MCS_2 <= MCS '<MCS_3 1/2 MCS_3 <= MCS ' 1
[0249] In some optional embodiments, a standard subcarrier spacing (expressed as SCS_1) and one or more standard modulation and encoding scheme thresholds (expressed as MCS ') that correspond to the standard subcarrier spacing can be predefined by a protocol, or they can be configured using higher layer signaling. In addition, for other non-standard subcarrier spacing (expressed as SCS_n), a corresponding scale factor β (0 <β <1) can be predefined by a protocol, or can be configured using higher layer signaling. It can be defined that β = SCS_1 / SCS_n. In the other non-standard subcarrier spacing, a standard modulation and encoding scheme threshold range in which an MCS is can be determined using an actual MCS modulation and encoding scheme and the standard MCS modulation and encoding scheme threshold . Then, a real-time domain density of PT-RS is determined by multiplying the scale factor β by a time domain density that corresponds to the standard modulation and coding scheme threshold range.
[0250] For example, if Table 4 shows modulation and coding scheme thresholds in a standard SCS_1 subcarrier spacing = 60 kHz, in a non-standard 120 kHz subcarrier spacing, if the actual MCS modulation and encoding scheme is in [MCS_2, MCS_3], the real-time domain density of PT-RS is a time domain density closest to a product of the time domain density 1/2 and the scale factor β. Since β = 60/120 = 1/2, the real-time domain density of PT-RS is 1/4. This example is used only to explain this embodiment of the present invention, and should not be interpreted as a limitation.
[0251] In this order, for different types of CP or lengths,
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64/82 a correspondence between the time domain density of the PT-RS and at least one of the subcarrier spacing and the modulation and coding scheme can be predefined by a protocol, or can be configured using more layer signaling high (for example, RRC signaling).
[0252] Optionally, for an extended cyclic prefix (Extended Cyclic Prefix, ECP), the time domain density of the PT-RS can be predefined by a protocol, or it can be configured using higher layer signaling from the as follows: PT-RS is continuously mapped to each symbol of a PUSCH (or a PDSCH). In this way, PT-RS can be used to assist estimation of Doppler shift in a high-speed long-delay extension scenario.
[0253] It should be noted that Table 3 and Table 4 are used only to explain this embodiment of the present invention, and should not be interpreted as a limitation.
[0254] (2) PT-RS frequency domain density [0255] In this order, the PT-RS frequency domain density can be related to at least one of a type of CP, a programmable bandwidth of user, a subcarrier spacing, and a modulation and coding scheme. Specifically, total L quantity _en _ _rs subcarriers for which the PT-RS is mapped within the width of user programmable band can be related to at least one of the type of CP, the width of user programmable band , the subcarrier spacing and the modulation and coding scheme.
[0256] Specifically, there is a correspondence between the frequency domain density of PT-RS and at least one among the type of CP, the user programmable bandwidth, the subcarrier spacing and the modulation and encoding scheme. Different types of CP, user programmable bandwidths, subcarrier spacing or modulation and encoding schemes correspond to different frequency domain densities. Specifically, the match can be predefined by a protocol, or it can be configured by the network device using higher layer signaling (for example, RRC signaling).
[0257] Specifically, for a given subcarrier spacing, one or more programmable bandwidth thresholds can be
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65/82 predefined, or can be configured using higher layer signaling. All programmable bandwidths between two adjacent programmable bandwidth thresholds correspond to the same frequency domain density as PT-RS, as shown in Table 5.
Table 5
Programmable bandwidth threshold Frequency domain density (number of subcarriers in each resource block) 0 <= BW <BW_1 0 BW_1 <= BW <BW_2 1 BW_2 <= BW <BW_3 1/2 BW_3 <= BW <BW__4 1/4 BW__4 <= BW <BW__5 1/8 BW_5 <= BW 1/16
[0258] BW_1, BW_2, BW_3, BW_4 and BW_5 are programmable bandwidth thresholds. A programmable bandwidth threshold can be represented by a number of resource blocks included in a programmable bandwidth, or it can be represented by a frequency domain range that corresponds to a programmable bandwidth. This is not limited in this document. The frequency domain density 1/2 indicates that PT-RS occupies one subcarrier in every two resource blocks. The meanings of the frequency domain densities 1/4, 1/8 and 1/16 can be obtained by analogy. The details are not described again.
[0259] Specifically, at a given subcarrier spacing, the frequency domain density of the PT-RS can be determined based on a programmable bandwidth threshold range within which an actual programmable bandwidth BW is. For example, supposing that Table 1 shows programmable bandwidth thresholds in a standard subcarrier spacing SCS_1 = 15 kHz, if the actual programmable bandwidth BW is in a range [BW_2, BW_3], the frequency domain density PT-RS is 1/2. This example is used only to explain this embodiment of the present invention, and should not be interpreted as a limitation.
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66/82 [0260] In this order, different subcarrier spacing can correspond to different programmable bandwidth thresholds. Specifically, different correspondence tables for a programmable bandwidth threshold and frequency domain density can be configured for different subcarrier spacing.
[0261] Specifically, programmable bandwidth thresholds that correspond to different subcarrier spacing can be predefined by a protocol, or can be configured by the network device using higher layer signaling (for example, RRC signaling).
[0262] In some optional modalities, a standard subcarrier spacing (expressed as SCS_1), for example, 15 kHz, and one or more standard programmable bandwidth thresholds (expressed as BW) that correspond to the standard subcarrier spacing can be predefined by a protocol, or can be configured using higher layer signaling. In addition, for other non-standard subcarrier spacing, a corresponding programmable bandwidth offset (expressed as BW__ofíset, which is an integer) can be predefined by a protocol, or can be configured using higher layer signaling. BW_offset + BW = BW ', where BW represents actual programmable bandwidth in the other non-standard subcarrier spacing. In the other non-standard subcarrier spacing, the frequency domain density of the PT-RS can be determined by adding the actual programmable bandwidth BW up to the programmable bandwidth offset BW_offset.
[0263] For example, if Table 6 shows programmable bandwidth thresholds in the standard SCS_1 subcarrier spacing = 15 kHz, in a non-standard 60 kHz subcarrier spacing, if a sum of the actual programmable bandwidth BW and BW_offset is in an interval [BW_1, BW_2], the frequency domain density of PT-RS is 1; or if a sum of the actual programmable bandwidth BW and BW_offset is in a range [BW_2, BW_3], the frequency domain density of PT-RS is 1/2. This example is used only to explain this embodiment of the present invention, and should not be interpreted as a limitation.
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Table 6
Programmable bandwidth threshold Frequency domain density (number of subcarriers in each resource block) 0 <= BW <BW_1 0 BW_1 <= BW <BW_2 1 BW_2 <= BW <BW_3 1/2 BW_3 <= BW <BW_4 1/4 BW_4 <= BW '<BW_5 1/8 BW_5 <= BW ' 1/16
[0264] In some optional embodiments, a standard subcarrier spacing (expressed as SCS_1) and one or more standard programmable bandwidth thresholds (expressed as BW) that correspond to the standard subcarrier spacing can be predefined by a protocol, or can configured using higher layer signaling. In addition, for other non-standard subcarrier spacing (expressed as SCS_n), a corresponding scale factor β (0 <β <1) can be predefined by a protocol, or can be configured using higher layer signaling. It can be defined that β = SCS_n / SCS_1. In the other non-standard subcarrier spacing, a standard programmable bandwidth threshold range in which a BW is can be determined using an actual programmable bandwidth BW and the standard programmable bandwidth threshold BW '. Then, a real frequency domain density of PT-RS is determined by multiplying the scale factor β by a frequency domain density that corresponds to the standard programmable bandwidth threshold range.
[0265] For example, if Table 6 shows programmable bandwidth thresholds at a standard subcarrier spacing SCS_1 = 60 kHz, at a non-standard subcarrier spacing 120 kHz, if the actual programmable bandwidth BW is at [BW_3 , BW_4], the actual frequency domain density of PT-RS is a frequency domain density closest to a product of frequency domain density 1/4 and scale factor β. Since β = 120/60 = 2, the density of the real frequency domain
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68/82 of PT-RS is 1/2. This example is used only to explain this embodiment of the present invention, and should not be interpreted as a limitation.
[0266] It should be noted that Table 5 and Table 6 are used only to explain this embodiment of the present invention, and should not be interpreted as a limitation.
[0267] In addition, this request additionally provides another method of signal transmission.
[0268] First, a non-coherent joint transmission scenario is described.
[0269] Currently, a network device and a terminal device can communicate with each other based on a multiple input multiple output technology. In an uplink communication process, the network device can configure the terminal device to send a poll reference signal. The sounding reference signal, SRS, is a reference signal used to measure an uplink channel. The network device measures an uplink channel based on the SRS sent by the terminal device, to obtain channel state information (CSI) from the uplink channel and program an uplink resource. When uplink and downlink channels have reciprocity, the network device can additionally obtain downlink CSI by measuring the SRS, that is, obtain first uplink CSI and then determine the downlink CSI with based on channel reciprocity.
[0270] In LTE, an SRS from a transmitter terminal device, two receivers (1T2R) can be switched between different antennas. In this case, when sending an uplink from the terminal device, only one antenna or port can be used for sending at the same time; and when receiving downlink, two antennas can be used for receiving. Therefore, in this case, the network device cannot obtain channels from the two downlink receiving antennas based on a single antenna SRS. To enable the network device to obtain channels from all downlink antennas, the terminal device must send SRSs on a plurality of antennas at different times, that is, send the SRSs in an SRS antenna switching mode.
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69/82 [0271] The following is a detailed description of yet another method of signal transmission to solve the previous technical problem. Details are provided below.
[0272] Step 1. A network device sends SRS configuration information to a terminal device. The number of antenna ports that is indicated in the antenna port information must not be greater than the number of antennas of the terminal device that can simultaneously perform uplink transmission.
[0273] Optionally, the network device configures a period of an SRS. The SRS period can be an absolute time, for example, 1 ms, 0.5 ms or 10 ms. In addition, the network device indicates, using signaling, an identifier that corresponds to the period. The network device may alternatively configure a relative time, for example, a number of slots, such as one slot or two slots. Alternatively, the network device can configure the period as a value less than 1, for example, 0.5 slots, in order to allow the SRS to be sent a plurality of times in a slot.
[0274] Optionally, the terminal device needs to report, in a message 3 (Msg3) or higher layer signaling, such as RRC signaling, a maximum number of antennas that can perform simultaneous sending. In this mode, a number of ports is u = 2.
[0275] Optionally, the network device sends signaling to the terminal device. Signaling is used to instruct the terminal device to send an SRS in an SRS antenna toggle mode, or to instruct the terminal device to support an antenna selection function.
[0276] Optionally, the network device notifies the terminal device of a total number of available antennas. For example, in this mode, the total number of antennas is v = 4. If u = 2, the terminal device sends using two antennas at once, and sends SRSs on four antennas in total.
[0277] Step 2. The terminal device sends SRSs on v antennas in a time division mode based on the configuration information of the network device, and sends SRSs using u ports or u antennas at the same time. An example in which u = 2 and v = 4 is used in this step. Specifically,
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70/82 there are the solutions to follow.
[0278] Solution 1: An antenna identifier can be denoted as a (n _SRS ). n _SRS is determined based on the amount of times an uplink reference signal is sent or based on at least one of a frame number, a subframe number, a slot number or a symbol number of a Current SRS, number of symbols for an SRS resource and an SRS period. Alternatively, n _SRS represents a current SRS transmission count within a period of time. For example, n _SRS is the number of times the uplink reference signal is sent or the number of times minus 1, or n _SRS is a count of an SRS time domain location in a one-frame cycle or one number of board. For example, in LTE, n _SRS is defined as follows:
ⁿ SRS -
Toffset
2N _SP n _f + 2 (N _SP - 1) g] + l L (n _f x 10 + Ln _s / 2D / T _SRS ] where N _SP is a number of times from descendant to uplink in a frame,
Toffsetjnax0 SRS period is 2 ms in TDD.
Other cases link switching n _f is a number of is the period of the SRS, frame, n _s is a slot number in a frame, T _SRS
Toffset θ determined based on a symbol location in a special subframe and an SRS symbol quantity, and T _offsetmax is a maximum value of T _offset . It can be learned that n _SRS in this calculation formula is a count of the SRS currently sent in all locations that satisfy the SRS period and that are in a period from 0 to 1,023 of a frame number.
[0279] When no frequency jump is performed: a (n _SRS ) = 2 [n _SRS mod 2] + γ (1) [0280] When frequency jump is performed: ^a ( ⁿ s / S) ⁼ (2 [(n _SRS + [n _SRS / 2] + β [n _SRS / K ) mod 2] + γ K is an even number.
(.2 [n _SRS mod 2] + γ, K is an odd number. '' „(1, Kmod 4 = 0„.
where β =, y = 0.1, ^r (0, other
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71/82 where K is the total number of hops in the frequency hop. In this document, a frequency hopping scenario where K = 2 is used as an example. The following table shows a relationship between an antenna port, a number of transmission times and a transmission bandwidth.
Table 7
ⁿ SRS First frequency hop bandwidth Second frequency hop bandwidth 0 Antennas {0, 1}1Antennas {2, 3} 2 Antennas {2, 3}3Antennas {0, 1}
[0281] One can learn that, since γ has two values, two antennas that perform simultaneous transmission can be obtained based on an _SRS n and calculation of (1). Therefore, in the first transmission, the terminal device sends an SRS at a first frequency hop location using antennas 0 and 1; in the second transmission, the terminal device sends an SRS at a second frequency hop location using antennas 2 and 3; in the third transmission, the terminal device sends an SRS at the first frequency hop location using antennas 2 and 3; and in the fourth transmission, the terminal device sends an SRS at the second frequency hop location using antennas 0 and 1.
[0282] Optionally, this solution can be applied to a case in which there are u transmitting antennas and 2u receiving antennas. In this case, (1) and (2) can change to the following: When no frequency jump is performed:
a (n _SRS ) = u [n _SRS mod 2] + γ (3) ^a (. ⁿ SRs) ⁼ (w · [(n _SRS + [n _SRS / 2] + β [n _SRS / K ) mod 2 ] + γ K is an even number.
u · [n _SRS mod 2] + γ K is an odd number. '' „Fl, Ârnod 4 = 0„ „.
where β =] „, and γ = 0.1, ..., u - 1.
^r (0, others [0283] Optionally, this solution is not limited to a correspondence between (n _sfi > _s ) and _SRS in the previous formulas.
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72/82 example, there may be the following expression of a correspondence between ^a ( ⁿ SRs) θ ⁿ SRS · a (n _SRS ) = uf (n _SRS ) + γ (5) where γ = 0, 1, ... , u-1, ef (n _SRS ) is a function of n _SRS .
[0284] Optionally, γ and β in this solution can have other values. For example, γ = 0.2 or γ = 0.2, ... 2u - 2. This is not limited in this document. Alternatively, γ and β can be values configured by the network device using signaling. The signaling can be RRC signaling, MAC CE signaling or DCI signaling.
[0285] Solution 2: An antenna identifier can be denoted as a (n _SRS y For n _SRS , see the definition in Solution 1.
[0286] When no frequency jump is performed:
â (n _SRS ) = n _SRS mod 2 (6) [0287] When frequency jump is performed:
A _ K ⁿ SRS + L ⁿ sRs / 2J + β ln _SRS / K ) mod 2. K is an even number.
ttlTlcpcj -) j, ) (n _SRS mod 2. K is an odd number.
„Íl, Kmod4 = 0. . . . ,.
where β =] ',, and a value of a (n _SRS ) is obtained from (0, others as follows:
a (n _SRS ) = FÇ ⁼ ° (8) ^SS (2,3, a (n _SRS ) = 1 ^v 'where K is a total number of frequency hop hops. In this document, a frequency hop scenario where K = 2 is used as an example. The following table shows a relationship between an antenna port, a number of transmission times and a transmission bandwidth.
Table 8
ⁿ SRS First frequency hop bandwidth Second frequency hop bandwidth 0 Antennas {0, 1}1Antennas {2, 3} 2 Antennas {2, 3}3Antennas {0, 1}
[0288] One can learn that, since γ has two values, two
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73/82 antennas that perform simultaneous transmission can be obtained based on an _SRS n and calculation of (1). Therefore, in the first transmission, the terminal device sends an SRS at a first frequency hop location using antennas 0 and 1; in the second transmission, the terminal device sends an SRS at a second frequency hop location using antennas 2 and 3; in the third transmission, the terminal device sends an SRS at the first frequency hop location using antennas 2 and 3; and in the fourth transmission, the terminal device sends an SRS at the second frequency hop location using antennas 0 and 1.
[0289] Optionally, a correspondence between â (n _SRS ) and a (n _SRS ) in formula (8) in this solution can be expressed using a table or another formula. This is not limited in this document. The correspondence between â (n _SRS ) and a (n _SRS ) can alternatively be a value configured by the network device using signaling. The signaling can be RRC signaling, MAC CE signaling or DCI signaling.
[0290] Optionally, this solution can be applied to a case where there are u transmitting antennas and 2u receiving antennas. In that case, (8) can change to the following:
₍ > ₌ í 0,1 ... u - 1, â (n _SRS ) = 0 ^SRS u, u + 1, ..., 2ií - 1, ã (n _SRS ) = 1 [0291] Likewise, optionally, a match between â (n _SRS ) and a (n _SRS ) in formula (9) in this solution can be expressed using a table or other formula. This is not limited in this document. (9) correspondence between â (n _SRS ) and a (n _SRS ) can alternatively be a value configured by the network device using signaling The signaling can be RRC signaling, MAC CE signaling or DCI signaling.
[0292] Optionally, this solution is also not limited to a correspondence between (n _SRS ) and _SRS in formulas (6) and (7).
[0293] Optionally, â (n _SRS ) in this solution can be understood as an antenna group identifier.
[0294] Optionally, according to Solution 1 or Solution 2 and another viable solution, the network device configures a plurality of SRS resources for the terminal device using the SRS configuration information. For example, the plurality of SRS resources forms a
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74/82 SRS resource group. Therefore, the fact that the network device instructs the terminal device to send an SRS in an SRS antenna switching mode, or instructs the terminal device to support an antenna selection function can be understood as configuring for an SRS to be sent in an antenna switching mode in the SRS resource group.
[0295] Optionally, in this case, at least one different antenna is used to send SRSs on at least two SRS resources in the SRS resource group. For example, a different antenna can be used to send an SRS on each SRS resource in the SRS resource group. Optionally, there is a match between an SRS resource and an SRSS antenna send in the SRS resource. For example, for a user with two transmit antennas and four receive antennas, an SRS resource group can include two SRS resources. A first SRS resource corresponds to two antennas, for example, antennas 0 and 1. A second SRS resource corresponds to the other two antennas, for example, antennas 2 and 3. Therefore, a time-frequency location for which the resource of SRS is mapped can be determined based on a transmission antenna determined in a transmission scheme with alternating SRS antenna, for example, Solution 1 and Solution 2. For example, when it is determined that transmission antennas are 0 and 1 , an SRS sent belongs to the first SRS resource, for example, an SRS resource 0; or when it is determined that transmission antennas are 2 and 3, a sent SRS belongs to another SRS resource, for example, an SRS resource 1. It should be noted that, since the SRS antenna switching scheme can be used to determine an antenna used by an SRS, an SRS resource, or an SRS resource number can also be determined using the same calculation formula. For example, a method for determining an SRS resource based on formulas (1) and (2) is as follows:
[0296] When no frequency jump is performed:
b (n _SRS ) = n _SRS mod 2 (1) [0297] When frequency jump is performed:
_b ç _n a ₌ K ⁿ SRS + Ln _S Rs / 2j + β (n _SRS / Kj) mod 2 K is an even number.
i srsj (n _SRS mod 2 K is an odd number. ''
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75/82 „(1, Kmod 4 = 0 where β =]’.
^Γ (. 0, other [0298] b (n _SRS ) is an identifier or a relative identifier of an SRS resource, or an identifier of an SRS resource in an SRS resource group. It should be noted that n _SRS in this document is determined based on the total number of times SRSs are sent on an SRS resource in the SRS resource group, or determined based on at least one of a frame number, a subframe number, a number of slot or symbol number of an SRS resource in the current SRS resource group, number of symbols from an SRS resource and a period of an SRS Alternatively, n _SRS represents a current SRS transmission count across all SRS resources in the SRS resource group within a period of time For details, see the descriptions in Solution 1. SRS refers to SRSs in all SRS resources in the SRS resource group.
[0299] In the preceding example, n _SRS is not an SRS count for a specific SRS resource in the SRS resource group, but it is an SRS count for all SRS resources in the SRS resource group. Optionally, n _SRS can alternatively be an SRS count for a specific SRS resource in the SRS resource group. Specifically, n _SRS is determined based on the number of times SRSs are sent on an SRS resource in the SRS resource group, or determined based on at least one of a frame number, a subframe number, a slot number or symbol number for an SRS resource in the current SRS resource group, a number of symbols for an SRS resource, and a period for an SRS. Alternatively, n _SRS represents a current SRS transmission count on an SRS resource in the SRS resource group within a period of time. For details, see the descriptions in Solution 1. The SRS is an SRS on an SRS resource in the SRS resource group. In this case, time domain and frequency domain resources are configured for a plurality of SRS resources in the SRS resource group, different SRS resources are used to measure the same frequency domain resource, and different SRS resources correspond to different antennas or antenna groups, to switch SRS transmission antennas on different SRS resources. For example, it is configured so that the
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76/82
SRS 0 corresponds to antennas 0 and 1, and the SRS resource 1 corresponds to antennas 2 and 3. The SRS resource group includes the SRS resource 0 and the SRS resource 1. The network device configures time- frequency of the SRS resource 0 and the SRS resource 1, and instructs the end device to send an SRS on an SRS resource in the SRS resource group, or on the SRS resource 0 and on the SRS resource 1, in order to send SRSs on all antennas by switching between different SRS features.
[0300] When compared to an LTE solution, this solution can additionally support switching the antenna to a terminal device with u Tx (transmit) antennas and R R (receive) antennas, where u> 1 or v> 2, I <v.
[0301] Figure 16 shows a wireless communications system, terminal and network device provided in this order. The wireless communications system 10 includes a first device 400 and a second device 500. In an uplink transmission process, the first device 400 can be the terminal 200 in the form of Figure 4, and the second device 500 can be the network device 300 in the mode of Figure 5. In a downlink transmission process, the first device 400 can be network device 300 in the mode of Figure 5, and the second device 500 can be terminal 200 in the mode of Figure 4. Wireless communications system 10 can be wireless communications system 100, shown in Figure 3. Below, descriptions are provided separately.
[0302] As shown in Figure 16, the first device 400 may include a processing unit 401 and a sending unit 403.
[0303] Processing unit 401 can be configured to map a first reference signal to a first symbol. The first reference signal is used for phase tracking. The first symbol includes a symbol that carries a data signal and that precedes a second symbol in a time domain unit. The second symbol is the first symbol that carries a demodulation reference signal in the time domain unit. Alternatively, the second symbol is a plurality of consecutive symbols in the time domain unit and the plurality of consecutive symbols includes the first symbol which carries the demodulation reference signal.
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77/82 [0304] The sending unit 403 can be configured to send the first reference signal to the second device 500.
[0305] Processing unit 401 can map a PT-RS according to the time domain PT-RS mapping rules described in Mode 1 to Mode 3. For details, see Mode 1 to Mode 3. Details are not described again in this document.
[0306] It can be understood that, for specific implementations of the function units included in the first device 400, reference can be made to the previous modalities. The details are not described again in this document.
[0307] As shown in Figure 16, the second device 500 can include a receiving unit 501 and a processing unit 503.
[0308] Receiving unit 501 can be configured to receive a first reference signal sent by the first device. The first reference signal is used for phase tracking. The first reference signal is mapped to a first symbol. The first symbol includes a symbol that carries a data signal and that precedes a second symbol. The second symbol is the first symbol that carries a demodulation reference signal in a time domain unit. Alternatively, the second symbol is a plurality of consecutive symbols in a time domain unit and the plurality of consecutive symbols includes the first symbol which carries the demodulation reference signal.
[0309] Processing unit 503 can be configured to perform phase tracking using the first reference signal.
[0310] For a time domain PT-RS mapping rule, refer to Mode 1 to Mode 3. Details are not described again in this document.
[0311] It can be understood that, for specific deployments of the function units included in the second device 500, reference can be made to the previous modalities. The details are not described again in this document.
[0312] Figure 17 shows a wireless communications system, terminal and network device provided in this order. The system of
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Wireless communications 20 includes a network device 600 and a terminal device 700. Network device 600 can be network device 300 in the embodiment of Figure 5, and terminal device 700 can be terminal 200 in the mode of Figure 4. Wireless communication system 20 can be wireless communication system 100 shown in Figure 3. Descriptions are provided below separately.
[0313] As shown in Figure 17, the network device 600 can include a processing unit 601 and a sending unit 603.
[0314] The processing unit 601 can be configured to generate first indication information. The first indication information indicates a location of a time-frequency resource occupied by at least two groups of first reference signals. The antenna ports separately associated with at least two groups of first reference signals are not quasi-colocalized.
[0315] The sending unit 603 can be configured to send the first indication information.
[0316] The sending unit 603 can be additionally configured to send a data signal. The data signal is not mapped to the time-frequency resource occupied by at least two groups of first reference signals.
[0317] It can be understood that, for specific deployments of the function units included in the network device 600, reference can be made to the modality of Figure 14 or Figure 15. The details are not described again in this document.
[0318] As shown in Figure 17, terminal device 700 can include a receiving unit 701 and a processing unit 703.
[0319] Receiving unit 701 can be configured to receive first indication information. The first indication information indicates a location of a time-frequency resource occupied by at least two groups of first reference signals. The antenna ports separately associated with at least two groups of first reference signals are not quasi-colocalized.
[0320] The processing unit 703 can be configured to
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79/82 determine, based on the first indication information, the time-frequency resource occupied by at least two groups of first reference signals.
[0321] Receiving unit 701 can be additionally configured to receive a data signal. The data signal is not mapped to the time-frequency resource occupied by at least two groups of first reference signals.
[0322] It can be understood that, for specific deployments of the function units included in the terminal device 700, reference can be made to the modality of Figure 14 or Figure 15. The details are not described again in this document.
[0323] Figure 18 is a schematic structural diagram of an appliance, according to this request. As shown in Figure 18, apparatus 80 may include a processor 801 and one or more interfaces 802 coupled to processor 801. Optionally, apparatus 80 may additionally include memory 803. Optionally, apparatus 80 may be a chip.
[0324] The 801 processor can be configured to read and execute a computer-readable instruction. In a specific deployment, the 801 processor can essentially include a controller, an arithmetic unit and a register. The controller is primarily responsible for decoding an instruction and sending a control signal for an operation that corresponds to the instruction. The arithmetic unit is responsible, essentially, for performing a fixed-point or oscillating-point arithmetic operation, a bypass operation, a logical operation, and the like, or it can perform an address operation and address translation. The record is responsible, essentially, for storing an operating record, an intermediate result of operation, and the like that are temporarily stored in an instruction execution process. In real deployment, an 801 processor hardware architecture can be an application-specific integrated circuit (ASIC) architecture, an MIPS architecture, an ARM architecture, an NP architecture, or the like. The processor 801 can have a single core or a plurality of cores.
[0325] The 803 memory can be configured to store code
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80/82 program that includes a computer-accessible instruction, and can be additionally configured to store 801 processor input / output data.
[0326] The 802 input / output interface can be configured to insert data to be processed in the 801 processor, and can output a processing result from the 801 processor. In specific deployment, the 802 interface can be an input / output interface of general purpose (General Purpose Input / Output, GPIO), and can be connected to a plurality of peripheral devices (for example, a display (LCD), a camera and a radio frequency module). The 802 interface can additionally include a plurality of independent interfaces, for example, an Ethernet interface, an LCD interface and a camera interface, which are responsible for communication between different peripheral devices and the 801 processor.
[0327] In this order, processor 801 can be configured to invoke, from memory, a deployment program, on one side of the first device, of the signal transmission method provided in the form of Figure 8, or a deployment program the embodiment of Figure 14 or Figure 15 on one side of the network device; and execute an instruction included in the program. The 802 interface can be configured to output an 801 processor run result.
[0328] It should be noted that a function that corresponds to each of the 801 processors and the 802 interface can be deployed using a hardware project, or can be deployed using a software project, or can be deployed combining software and hardware. This is not limited in this document.
[0329] Figure 19 is a schematic structural diagram of an appliance, according to this request. As shown in Figure 19, apparatus 90 may include a processor 901 and one or more interfaces 901 coupled to processor 902. Optionally, apparatus 90 may additionally include memory 903. Optionally, apparatus 90 may be a chip.
[0330] Processor 901 can be configured to read and execute a computer-readable instruction. In a specific deployment, the 901 processor can essentially include a controller, a unit
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81/82 arithmetic and a record. The controller is primarily responsible for decoding an instruction and sending a control signal for an operation that corresponds to the instruction. The arithmetic unit is responsible, essentially, for performing a fixed-point or oscillating-point arithmetic operation, a bypass operation, a logical operation, and the like, or it can perform an address operation and address translation. The record is essentially responsible for storing an operating record, an intermediate result of operation, and the like that are temporarily stored in an instruction execution process. In a specific deployment, a 901 processor hardware architecture can be an application-specific integrated circuit (ASIC) or similar architecture. The processor 901 can have a single core or a plurality of cores.
[0331] The 903 memory can be configured to store program code that includes a computer-accessible instruction, and can be additionally configured to store 901 processor input / output data.
[0332] The input / output interface 902 can be configured to insert data to be processed in the 901 processor, and can output a processing result from the 901 processor.
[0333] In this order, processor 901 can be configured to invoke, from memory, a deployment program, on one side of the second device, of the signal transmission method provided in the form of Figure 8, or a deployment program the embodiment of Figure 14 or Figure 15 on one side of the terminal device; and execute an instruction included in the program. Interface 902 can be configured to output an execution result from processor 901.
[0334] It should be noted that a function that corresponds to each of the 901 processor and the 902 interface can be deployed using a hardware project, or can be deployed using a software project, or can be deployed combining software and hardware. This is not limited in this document.
[0335] To summarize, according to the technical solutions provided in this application, it can be guaranteed that a PT-RS is also mapped to a symbol to which a data channel is mapped and that precedes a symbol
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82/82 that carries a DMRS, thereby guaranteeing phase noise estimation performance.
[0336] A person of common skill in the technique can understand that all or some of the methods of the methods in the modalities can be implemented by a computer program that instructs relevant hardware. The program can be stored on a computer-readable storage medium. When executed, the program may include the procedures of the previous method modalities. The storage media includes any media that can store program code, such as a ROM, a RAM random access memory, a magnetic disk or a compact disk.

权利要求:
Claims (25)
[1]
1. Signal transmission method, comprising:
sending, by a first device, a first reference signal to a second device, where the first reference signal is used for phase tracking; the first reference signal is mapped to a first symbol; the first symbol comprises a symbol that carries a data signal and that precedes a second symbol in a time domain unit; and the second symbol is an initial symbol that carries a demodulation reference signal (DMRS) in the time domain unit.
[2]
A method according to claim 1, wherein starting from an initial symbol that carries the data signal, the first reference signal is mapped uniformly to a symbol that precedes the second symbol.
[3]
A method according to claim 1 or 2, wherein the first reference signal is mapped to a resource other than a first resource which carries a physical downlink control channel (PDCCH).
[4]
4. Method according to claim 1 or 2, wherein the first reference signal is mapped to a resource other than a first resource which carries one or more of the following signals:
a sync signal block, a channel status information reference signal, or a demodulation reference signal.
[5]
A method according to any one of claims 1 to 4, wherein an index of a symbol that is used to carry the first reference signal and that precedes the second symbol is related to a first difference, and the first difference is a difference between an index of the initial symbol carrying the second reference signal and an index of the initial symbol carrying the data signal.
[6]
A method according to claim 5, wherein the index l of the symbol which is used to carry the first reference signal and which precedes the second symbol is as follows:
i = i ₀ - [h ₂ - (
l) xL] -Lxl; or
I = ₁₀ - [L - (- H ₂ ) modL] -Lxl | = the 1 2 where '''and
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2/5 '° represents the index of the initial symbol carrying the second reference signal, L represents a reciprocal of a time domain density of the first reference signal, and H2 represents the first difference.
[7]
Method according to any one of claims 1 to 6, wherein in time domain, the first reference signal is mapped uniformly to a symbol whose index is greater than an index of the second symbol.
[8]
8. Method according to claim 7, in which the first reference signal is mapped to the last symbol that carries the data signal and that follows the second symbol, and in time domain, the first reference signal is mapped evenly for a symbol that follows the second symbol in decreasing order of symbol index values.
[9]
9. Communications apparatus, comprising:
a processing unit, configured to map a first reference signal to a first symbol, where the first reference signal is used for phase tracking; the first symbol comprises a symbol that carries a data signal and that precedes a second symbol in a time domain unit; and the second symbol is an initial symbol that carries a demodulation reference signal (DMRS) in the time domain unit; and a sending unit, configured to send the first reference signal to a second device.
[10]
A communications apparatus according to claim 9, wherein from an initial symbol carrying the data signal, the first reference signal is uniformly mapped to a symbol preceding the second symbol.
[11]
A communications apparatus according to claim 9 or 10, wherein the first reference signal is mapped to a resource other than a first resource which carries a physical downlink control channel (PDCCH).
[12]
Communications apparatus according to claim 9 or 10, wherein the first reference signal is mapped to a resource other than a first resource which carries one or more of the following signals:
Petition 870190107751, of 10/24/2019, p. 11/11
3/5 a sync signal block, a channel status information reference signal, or a demodulation reference signal.
[13]
13. Communication apparatus according to claim 9, wherein an index of a symbol that is used to carry the first reference signal and that precedes the second symbol is related to a first difference, and the first difference is a difference between an index of the initial symbol carrying the second reference signal and an index of the initial symbol carrying the data signal.
[14]
Communications apparatus according to claim 13, wherein the index l of the symbol which is used to carry the first reference signal and which precedes the second symbol is as follows:
i = i ₀ - [h ₂ - (

[15]
Communications apparatus according to any one of claims 9 to 14, in which, in time domain, the first reference signal is uniformly mapped to a symbol whose index is greater than an index of the second symbol.
[16]
The communications apparatus according to claim 15, wherein the first reference signal is mapped to the last symbol that carries the data signal and that follows the second symbol, and in time domain, the first reference signal is uniformly mapped to a symbol that follows the second symbol in decreasing order of symbol index values.
[17]
17. Signal transmission method, comprising:
receiving, by a second device, a first reference signal sent by a first device, in which the first reference signal is used for phase tracking; the first reference signal is mapped to a first symbol; the first symbol comprises a symbol that carries a
Petition 870190107751, of 10/24/2019, p. 9/11
4/5 data signal and preceding a second symbol; and the second symbol is an initial symbol that carries a demodulation reference signal (DMRS) in a time domain unit.
[18]
18. The method of claim 17, wherein starting from an initial symbol carrying the data signal, the first reference signal is mapped uniformly to a symbol preceding the second symbol.
[19]
19. The method of claim 17 or 18, wherein the first reference signal is mapped to a resource other than a first resource which carries a physical downlink control channel (PDCCH).
[20]
20. Method according to claim 17 or 18, wherein the first reference signal is mapped to a resource other than a first resource which carries one or more of the following signals:
a sync signal block, a channel status information reference signal, or a demodulation reference signal.
[21]
21. Communications apparatus, comprising:
a receiving unit, configured to receive a first reference signal sent by a first device, where the first reference signal is used for phase tracking; the first reference signal is mapped to a first symbol; the first symbol comprises a symbol that carries a data signal and precedes a second symbol; and the second symbol is an initial symbol that carries a demodulation reference signal (DMRS) in a time domain unit; and a processing unit, configured to perform phase tracking using the first reference signal.
[22]
22. A communications apparatus according to claim 21, wherein from an initial symbol carrying the data signal, the first reference signal is uniformly mapped to a symbol preceding the second symbol.
[23]
23. A communications apparatus according to claim 21 or 22, wherein the first reference signal is mapped to a resource other than a first resource which carries a physical downlink control channel (PDCCH).
[24]
24. Communications apparatus according to claim 21 or
Petition 870190107751, of 10/24/2019, page, 10/11
5/5
22, in which the first reference signal is mapped to a resource other than a first resource which carries one or more of the following signals:
a sync signal block, a channel status information reference signal, or a demodulation reference signal.
[25]
25. Computer-readable storage media that stores program code in it, when the program code is executed on a computer, enables the computer to execute the method as defined in any of claims 1 to 8, or, as defined in any of claims 17 to 20.

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法律状态:
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