METHOD FOR TRANSMISSION OF PHASE TRACKING REFERENCE SIGNAL IN UPWARD LINK BY USER EQUIPMENT IN A WIR

专利摘要:
the present invention proposes a method for transmitting and receiving an uplink phase tracking reference signal between a user equipment and a base station in a wireless communication system and an apparatus. according to a modality applicable to the present invention, the user equipment can transmit a phase tracking reference signal in uplink to the base station using a power intensification level determined based on the first information and the second information received from base station.
公开号:BR112019007429B1
申请号:R112019007429-5
申请日:2018-12-07
公开日:2020-06-02
发明作者:Kilbom LEE；Jiwon Kang；Haewook Park
申请人:Lg Electronics Inc.；
IPC主号:

专利说明:

"METHOD FOR TRANSMISSION OF PHASE TRACKING REFERENCE SIGNAL ON UPWARD LINK BY USER EQUIPMENT IN A WIRELESS COMMUNICATION SYSTEM AND APPLIANCE TO SUPPORT THE SAME"
TECHNICAL FIELD
[001] The following description refers to a wireless communication system and, more particularly, to a method for transmitting an uplink phase tracking reference signal by a user equipment in a wireless communication system. cord and a device to support it.
TECHNICAL FUNDAMENTALS
[002] Wireless access systems have been widely implemented to provide various types of communication services such as voice or data. In general, a wireless access system is a multiple access system that supports communication from multiple users by sharing available system resources (bandwidth, transmission power, etc.) among others. For example, multiple access systems include a Code Division Multiple Access system (CDMA), a Frequency Division Multiple Access system (FDMA), a Time Division Multiple Access system (TDMA), a system Multiple Access by Orthogonal Frequency Division (OFDMA) and a Single Access Frequency Division Multiple Access system (SC-FDMA).
[003] Since a number of communication devices required greater communication capacity, the need for mobile broadband communication more improved than existing radio access technology (RAT) has increased. In addition, massive machine-type communications (MTC) capable of providing various services at any time and from any place connecting a series of devices or things to each other have been considered in the next generation communication system. In addition, a communication system design
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2/73 able to support services / UEs sensitive to reliability and latency was discussed.
[004] As previously described, the introduction of the next generation RAT was discussed considering improved mobile broadband communication, massive MTC, ultra-reliable and low latency communication (URLLC), and the like.
[005] In particular, since a method for transmitting and receiving a signal across multiple frequency bands is considered, a concept for a phase tracking reference signal (PT-RS) to estimate a phase noise between a user equipment and a base station in the various frequency bands is under discussion in several ways.
DISCLOSURE OF THE INVENTION
TECHNICAL PROBLEM
[006] A technical task of the present invention is to provide a method for transmitting an uplink phase tracking reference signal by a user equipment in a wireless communication system and an apparatus supporting it.
[007] Individuals skilled in the art will assess that the objectives that can be achieved by the present disclosure are not limited to what was particularly described above and this and other objectives that the present disclosure could achieve will be understood more clearly from the detailed description a follow.
SOLUTION TO THE PROBLEM
[008] The present invention provides a method for transmitting an uplink phase tracking reference signal by a user equipment to a base station in a wireless communication system and an apparatus supporting it.
[009] In one aspect of the present invention, a method is provided for transmitting a phase-tracking reference signal (PT-RS) over user equipment (UE) in a wireless communication system, the
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3/73 method comprises: receiving, from a base station, (i) first information regarding the power intensification for transmission from PT-RS and (ii) second information regarding a pre-coding matrix for transmission of a Shared Channel on Physical Uplink (PUSCH); determine a level of power intensification based on the first information and the second information, where the level of power intensification is related to a ratio between the power of PUSCH and the power of PT-RS per layer and per resource element ( RE); and transmit, to the base station, the PT-RS using the determined power intensification level. In this document, determining the power intensification level based on the first information and the second information comprises: based on the pre-coding matrix indicated by the second information being a partially coherent pre-coding matrix or a non-coherent pre-coding matrix, determining the power intensification level based on a number of PT-RS ports.
[010] In another aspect of the present invention, a user equipment (UE) configured to transmit a phase tracking reference signal (PT-RS) in a wireless communication system is provided, the UE comprising: a radio frequency (RF) module; at least one processor; and at least one computer memory operably connectable to at least one processor and store instructions that, when executed, induce at least one processor to perform operations. In this document, operations include: receiving, through the RF module and from a base station, (i) first information regarding the power intensification for transmission from PT-RS and (ii) second information regarding a matrix pre-coding for transmission of a Shared Channel on Physical Ascending Link (PUSCH); determine a level of power intensification based on the
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4/73 first information and the second information, in which the level of power intensification is related to a ratio between PUSCH power and PT-RS power per layer and per resource element (RE); and transmit, through the RF module and the base station, the PT-RS using the determined power intensification level, in which determining the power intensification level based on the first information and the second information comprises: based on pre-coding matrix indicated by the second information being a partially coherent pre-coding matrix or a non-coherent pre-coding matrix, determine the power intensification level based on a number of PT-RS ports.
[011] In this document, the first information may indicate a plurality of levels of power intensification, and the determination of the level of power intensification based on the first information and the second information may comprise determining, based on the second information, a among a plurality of power intensification levels.
[012] In particular, the determination of the level of power intensification based on the first information and the second information may comprise: based on the second information indicate the partially coherent precoding matrix, determine the level of power intensification as a first level power intensification among the plurality of power intensification levels indicated by the first information; and based on the second information, indicate the non-coherent pre-coding matrix, determine the power boost level as a second power boost level different from the first power boost level, among the plurality of power boost levels indicated by the first information.
[013] In the aforementioned configuration, determining the level of
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5/73 power intensification based on the number of PT-RS ports can comprise: based on (i) the second information indicating a partially coherent pre-coding matrix, and (ii) the number of PT-RS ports being equal to 1: determine the power intensification level as 0 dB in a state in which a number of layers of PUSCH is equal to 2 or 3; and determining the power boost level to be 3 dB in a state where a number of layers of PUSCH is equal to 4.
[014] In the aforementioned configuration, the determination of the power intensification level based on the number of PT-RS ports can comprise: based on (i) the second information indicating a partially coherent precoding matrix, and (ii) the number PT-RS ports being equal to 2: determine the power intensification level as being 3 dB in a state in which a number of layers of PUSCH is equal to 2 or 3; and determining the power boost level to be 6 dB in a state where a number of layers of PUSCH is equal to 4.
[015] In the aforementioned configuration, the determination of the power intensification level based on the number of PT-RS ports can comprise: based on (i) the second information indicating a non-coherent precoding matrix, and (ii) the number of PT-RS ports being equal to 1: determine the power intensification level as being 0 dB.
[016] In the aforementioned configuration, the determination of the power intensification level based on the number of PT-RS ports can comprise: based on (i) the second information indicating a non-coherent precoding matrix, and (ii) the number of PT-RS ports equal to 2: determine the power intensification level as being 3 dB.
[017] In the aforementioned configuration, the second information may refer to a transmission classification indicator (TRI) and an
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6/73 transmission pre-coding matrix (TPMI) for the pre-coding matrix for PUSCH transmission.
[018] In particular, the second information may indicate whether the pre-coding matrix for PUSCH transmission is the partially coherent pre-coding matrix or the non-coherent pre-coding matrix.
[019] Additionally, the UE may determine that PUSCH transmission is not based on a codebook; and based on the PUSCH transmission not being based on a codebook, the UE can determine the power intensification level based on the number of PT-RS ports: based on the number of PT-RS ports being equal to 1 , determining the power intensification level as being 0 dB; and based on the number of PT-RS ports being equal to 2, determining the power intensification level as being 3 dB.
[020] It should be understood that both the previous general description and the following detailed description of the present disclosure are exemplary and explanatory and are not intended to provide an additional explanation of the disclosure as claimed.
ADVANTAGE EFFECTS OF THE INVENTION
[021] As apparent from the previous description, the modalities of the present disclosure have the following effects.
[022] According to the present invention, a user equipment (UE) can enhance the transmission power of a PT-RS based on a pre-coding matrix provided (indicated) by a base station. In particular, according to the present invention, although the UE intensifies the transmission power of the PT-RS, the UE is able to maintain an antenna power restriction (for example, to consistently maintain the antenna power in the aspect of medium or term) required by standard technology.
[023] Since the UE does not require an additional power amplifier to
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7/73 intensify the transmission power of the PT-RS, it is able to reduce the costs of the UE.
[024] Likewise, the UE is able to control a PT-RS power boost level at an antenna level of a UE in a predetermined range, so the UE is able to consistently maintain a power restriction of according to an antenna.
[025] Therefore, according to the present invention, the UE is able to transmit PT-RS applying a certain level of power intensification while maintaining the power restriction for each antenna restriction, and the base station is capable to perform a more accurate channel estimate using PT-RS.
[026] The aspects described above of the present invention are merely a part of the preferred embodiments of the present invention. Those skilled in the art will derive and understand various modalities that reflect the technical features of the present invention from the detailed description below of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[027] The accompanying drawings, which are included to provide a further understanding of the invention, provide modalities of the present invention along with the detailed explanation. In addition, a technical feature of the present invention is not limited to a specific design. The characteristics revealed in each of the drawings are combined with each other to configure a new modality. The numerical references in each drawing correspond to structural elements.
[028] Figure 1 is a diagram that illustrates physical channels and a signal transmission method that uses physical channels;
[029] Figure 2 is a diagram illustrating a slot structure
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8/73 independent applicable to the present invention;
[030] Figures 3 and 4 are diagrams that illustrate representative connection methods for connecting TXRUs to antenna elements;
[031] Figure 5 is a schematic diagram illustrating a hybrid beam-forming structure according to an embodiment of the present invention from the perspective of TXRUs and physical antennas;
[032] Figure 6 is a diagram that schematically illustrates the operation of beam scanning for synchronization signals and system information during a downlink transmission (DL) process according to an embodiment of the present invention;
[033] Figure 7 is a diagram illustrating a PT-RS time domain pattern applicable to the present invention;
[034] Figure 8 is a diagram that briefly illustrates two types of DM-RS configurations applicable to the present invention;
[035] Figure 9 is a diagram that briefly illustrates an example for a DM-RS loaded in front of a type 1 DM-RS configuration applicable to the present invention;
[036] Figure 10 is a diagram illustrating an example of a fully coherent pre-coding matrix configuration according to an embodiment of the present invention;
[037] Figure 11 is a diagram illustrating an example of a partially coherent pre-coding matrix configuration according to a different embodiment of the present invention;
[038] Figure 12 is a diagram illustrating an example of a non-coherent pre-coding matrix configuration according to an additional different embodiment of the present invention;
[039] Figure 13 is a diagram that briefly illustrates an operation of
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9/73 transmission and reception of a UL PT-RS between a UE and a base station applicable to the present invention, and Figure 14 is a flow chart illustrating a method of transmitting a UL PT-RS from a UE applicable to the present invention. invention.
[040] Figure 15 is a diagram illustrating configurations of a UE and a base station capable of implementing modalities of the present invention.
MODE FOR THE INVENTION
[041] The modalities of the present disclosure described below are combinations of elements and resources of the present disclosure in specific forms. Elements or features can be considered selective unless otherwise noted. Each element or resource can be practiced without being combined with other elements or resources. Furthermore, a modality of the present disclosure can be constructed by combining parts of the elements and / or resources. The operating orders described in the modalities of the present disclosure can be rearranged. Some constructions or elements of any modality can be included in another modality and can be replaced by corresponding constructions or resources of another modality.
[042] In the description of the accompanying drawings, a detailed description of procedures or steps known to the present disclosure will be avoided as it may obscure the subject of the present disclosure. In addition, procedures or steps that can be understood by individuals skilled in the art will not be described.
[043] Throughout the specification, when a given portion "includes" or "comprises" a particular component, it indicates that other components are not excluded and may be additionally included except where noted otherwise. The terms “unit”, “-or / er” and “module” described in the specification indicate a unit to process at least one function or operation, which can be implemented by hardware, software or a combination of
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10/73 same. In addition, the terms "one or one", "one", "o", "a" etc. may include a representation in the singular and a representation in the plural in the context of the present disclosure (more particularly, in the context of the following claims) except where otherwise indicated in the specification or except where the context clearly indicates otherwise.
[044] In the modalities of the present disclosure, a description is mainly made by a data transmission and reception relationship between a Base Station (BS) and a User Equipment (UE). A BS refers to a terminal node in a network, which communicates directly with a UE. A specific operation described as being performed by the BS can be performed by an upper node of the BS.
[045] That is, it is apparent that, in a network composed of a plurality of network nodes including a BS, several operations performed for communication with a UE can be performed by the BS, or network nodes other than the BS. The term 'BS' can be replaced by a fixed station, a Node B, an Evolved Node B (eNode B or eNB), an Advanced Base Station (ABS), an access point, etc.
[046] In the terms of the present disclosure, the term terminal can be replaced by a UE, a Mobile Station (MS), a Subscribing Station (SS), a Mobile Subscribing Station (MSS), a mobile terminal, an Advanced Mobile Station ( AMS), etc.
[047] A transmission end is a fixed and / or mobile node that provides a data service or a voice service and a receiving end is a fixed and / or mobile node that receives a data service or a voice service . Therefore, a UE can serve as a transmit end and a BS can serve as a receive end, on an Uplink (UL). Similarly, the UE can serve as a receiving end and the BS can serve as a transmitting end, on a Downlink (DL).
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[048] The modalities of this disclosure can be supported by standard specifications revealed for at least one of the wireless access systems including an 802.xx system from the Institute of Electrical and Electronic Engineers (IEEE), a Third Party Partnership Project system Generation (3GPP), a 3GPP Long Term Evolution (LTE) system, 3GPP 5G NR system and a 3GPP2 system. In particular, the modalities of the present disclosure can be supported by the standard specifications, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331. That is, the steps or parts, which are not described to clearly reveal the technical idea of the present disclosure, in the modalities of the present disclosure can be explained by the previous standard specifications. All terms used in the modalities of the present disclosure can be explained by the standard specifications.
[049] Reference is now made in detail to the modalities of the present disclosure with reference to the attached drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary modalities of the present disclosure, rather than showing the only modalities that can be implemented according to the disclosure.
[050] The following detailed description includes specific terms in order to provide a full understanding of the present disclosure. However, it will be apparent to individuals skilled in the art that specific terms can be replaced by other terms without departing from the scope and technical scope of the present disclosure.
[051] From now on, 3GPP NR systems are explained, which are examples of wireless access systems.
[052] The modalities of the present disclosure can be applied to various wireless access systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Multiple Division Access.
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Time (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc.
[053] In order to make the technological characteristics of the present invention more clearly understood, the modalities of the present invention are explained by focusing on the 3GPP NR system. However, the modalities proposed by the present invention can be similarly applied to a different wireless system (for example, 3GPP LTE, IEEE 802.16, IEEE 802.11, etc.).
1. NR system
1.1. Physical channels and signal transmission and reception method that uses the same
[054] In a wireless access system, a UE receives information from a gNB in a DL and transmits information to gNB in a UL. The information transmitted and received between the UE and the gNB includes general data information and various types of control information. There are many physical channels according to the types / uses of information transmitted and received between gNB and UE.
[055] Figure 1 illustrates physical channels and a general signal transmission method using the physical channels, which can be used in the modalities of the present disclosure.
[056] When a UE is turned on or enters a new cell, the UE performs an initial cell search (S11). The initial cell search involves acquiring synchronization from a gNB. Specifically, the UE synchronizes its timing to the gNB and acquires information as a Cell Identifier (ID) receiving a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the gNB .
[057] Then, the UE can acquire a broadcast of information in the cell receiving a Physical Broadcast Channel (PBCH) from the gNB.
[058] During the initial cell search, the UE can monitor a status of
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13/73 channel in DL receiving a Reference Signal in Downlink (DL RS).
[059] After the initial cell search, the UE can acquire more detailed system information by receiving a Downlink Link Physical Control Channel (PDCCH) and receiving a Downlink Link Physical Shared Channel (PDSCH) based on PDCCH information (S12).
[060] To complete the connection to gNB, the UE can perform a random access procedure with gNB (S13 to S16). In the random access procedure, the UE can transmit a preamble on a Physical Random Access Channel (PRACH) (S13) and can receive a Random Access Response (RAR) through a PDCCH and a PDSCH associated with the PDCCH (S14). The UE transmits Shared Channel on Physical Uplink (PUSCH) using scheduling information included in the RAR, and performs a contention resolution procedure including the receipt of a PDCCH signal and a PDSCH signal corresponding to the PDCCH signal (S16).
[061] After the previous procedure, the UE can receive a PDCCH and / or a PDSCH from gNB (S17) and transmit a Physical Uplink Shared Channel (PUSCH) and / or an Uplink Physical Control Channel ( PUCCH) to gNB (S18), in a general UL / DL signal transmission procedure.
[062] The control information that the UE transmits to the gNB is generically referred to as Uplink Control Information (UCI). The UCI includes a Hybrid Automatic Replay and Negative Confirmation / Confirmation (HARQ-ACK / NACK), a Schedule Request (SR), a Channel Quality Indicator (CQI), a Pre-Coding Matrix Index (PMI ), a Classification Indicator (IR), etc.
[063] In the LTE system, UCI is usually transmitted on a PUCCH periodically. However, if control information and traffic data
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14/73 need to be transmitted simultaneously, control information and traffic data can be transmitted on a PUSCH. In addition, the UCI can be transmitted periodically on the PUSCH, upon receipt of a request / command from a network.
1.2. Numerologies
[064] The NR system to which the present invention is applied supports several OFDM (Orthogonal Frequency Division Multiplexing) numerologies shown in the table below. In this case, the numerology parameter value μ and cyclic prefix information by carrier bandwidth can be signaled in DL and UL, respectively. For example, the numerology parameter value μ and cyclic prefix information by carrier bandwidth on the downlink can be signaled via DL-BWP-mu and DL-MWP-cp corresponding to the upper layer signaling. As another example, the numerology parameter value μ and cyclic prefix information by uplink carrier bandwidth can be signaled using UL-BWP-mu and UL-MWP-cp corresponding to the upper layer signaling.
[TABLE 1]
THE v = 2 -15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, Extended 3 120 Normal 4 240 Normal
1.3 Framework structure
[065] DL and UL transmissions are configured with frames with a length of 10 ms. Each frame can be composed of ten subframes, each having a length of 1 ms. In this case, the number of OFDM symbols
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15/73 consecutive in each subframe is »rsubframc / z _» rslot x rsubframç / z '' symb ^- - '* symt / ^V slot
[066] In addition, each subframe can be composed of two half-frames with the same size. In this case, the two semi-frames are composed of subframes 0 to 4 and subframes 5 to 9, respectively.
[067] For a μ numerology parameter or Af subcarrier spacing based on the subframe in ascending parameter order, slots can be numbered in one
x j- subframe, μ slot
and it can also be number in a table in ascending order like
In this case, the number of consecutive OFDM yíilot symbols in a slot ( ^s Y ^mb ) can be determined as shown in the η ^μ table below according to the cyclic prefix. The starting slot ( ^s ) of a η ^μ N ^Ao h subframe is aligned to the starting OFDM symbol (s symb) of the same subframe in the time dimension. Table 2 shows the number of
OFDM in each slot / frame / subframe in the case of the normal cyclic prefix, and the Table shows the number of OFDM symbols in each slot / frame / subframe in the case of the extended cyclic prefix.
[TABLE 2]
μ xrtlot ^v symb slot T ^ stib frame / 1 ^v slot 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32 [TABLE 3]xrtlot ^v symb slot T ^ stib frame / 1 ^v slot
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2 12 40 4
[068] In the NR system to which the present invention can be applied, an autonomous slot structure can be applied based on the slot structure described above.
[069] Figure 2 is a diagram illustrating an autonomous slot structure applicable to the present invention.
[070] In Figure 2, the hatched area (for example, symbol index = 0) indicates a downlink control region, the black area (for example, symbol index = 13) indicates an upward control region. . The remaining area (for example, symbol index = 1 to 13) can be used for data transmission in DL or UL.
[071] Based on this structure, eNB and UE can sequentially carry out a DL transmission and a UL transmission in a slot. That is, eNB and UE can transmit and receive not only data in DL, but also ACK / NACK in UL in response to data in DL in a slot. Consequently, due to this structure, it is possible to reduce the time required for data retransmission in the event of a data transmission error, thus minimizing the latency of the final data transmission.
[072] In this autonomous slot structure, a predetermined length of a time slot is necessary for the process of allowing eNB and UE to switch from the transmission mode to the receiving mode and vice versa. In this sense, in the autonomous slot structure, some OFDM symbols when switching from DL to UL are set as a guard period (GP).
[073] Although it is described that the autonomous slot structure includes control regions in DL and UL, these control regions can be selectively included in the autonomous slot structure. In other words, the autonomous slot structure according to the present invention can include the control region in
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DL or the UL control region as well as the DL and UL control regions as shown in Figure 2.
[074] In addition, for example, the slot can have several slot formats. In this case, the OFDM symbols in each slot can be divided into downlink symbols (denoted by 'D'), flexible symbols (denoted by 'X'), and upward symbols (denoted by 'U').
[075] Therefore, the UE can assume that the transmission in DL occurs only in symbols denoted by 'D' and 'X' in the DL slot. Similarly, the UE can assume that UL transmission occurs only in symbols denoted by 'U' and 'X' in the UL slot.
1.4. Analog beam formation
[076] In a millimeter wave (mmW) system, since a wavelength is short, a plurality of antenna elements can be installed in the same area. That is, considering that the wavelength in the band of 30 GHz is 1 cm, a total of 100 antenna elements can be installed in a panel of 5 * 5 cm in intervals of 0.5 lambda (wavelength) in the case of a two-dimensional arrangement. Therefore, in the mmW system, it is possible to improve coverage or performance by increasing the beam formation gain (BF) using multiple antenna elements.
[077] In this case, each antenna element can include a transceiver unit (TXRU) to enable the adjustment of transmission power and phase per antenna element. In this way, each antenna element can carry out an independent beam formation by means of frequency.
[078] However, installing TXRUs across about 100 antenna elements is less cost-effective. Therefore, a method of mapping a plurality of antenna elements to a TXRU and adjusting the direction of a beam using an analog phase shifter was considered. However, this method
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18/73 is disadvantageous because the fact that frequency-selective beam formation is impossible because only one beam direction is generated by the full band.
[079] To solve this problem, as an intermediate form of digital BF and analog BF, hybrid BF with B TXRUs that are less than Q antenna elements can be considered. In this case of hybrid BF, the number of beam directions that can be transmitted at the same time is limited to B or less, which depends on how B TXRUs and Q antenna elements are connected.
[080] Figures 3 and 4 are diagrams that illustrate representative methods for connecting TXRUs to antenna elements. In this document, the TXRU virtualization model represents the relationship between TXRU output signals and antenna element output signals.
[081] Figure 3 shows a method for connecting TXRUs to subarrays. In Figure 3, an antenna element is connected to a TXRU.
[082] However, Figure 48 shows a method for connecting all TXRUs to all antenna elements. In Figure 4, all antenna elements are connected to all TXRUs. In that case, separate addition units are required to connect all antenna elements to all TXRUs as shown in Figure 4.
[083] In Figures 3 and 4, W indicates a phase vector weighted by an analog phase shifter. That is, W is a main parameter that determines the direction of the analog beam formatting. In this case, the mapping ratio between the antenna ports of CSI-RS and TXRUs can be 1: 1 or 1-to-many.
[084] The configuration shown in Figure 3 has a disadvantage that it is difficult to achieve a beam formation focus, but it has an advantage that all antennas can be configured at low cost.
[085] In contrast, the configuration shown in Figure 4 is advantageous in that the beam formation focus can be easily achieved. However,
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19/73 since all antenna elements are connected to the TXRU, there is a high cost disadvantage.
[086] When a plurality of antennas are used in the NR system to which the present invention is applicable, the hybrid beam formation method obtained by combining digital beam formation and analog beam formation can be applied. In this case, analog beam formation (or radio frequency (RF)) means the operation where a pre-coding (or combination) is performed at the RF end. In the case of hybrid beam formation, pre-coding (or combining) is performed at the base band end and the RF end, respectively. Therefore, the hybrid beam formation is advantageous because it guarantees a performance similar to the digital beam formation while reducing the number of RF chains and z D / A converters (digital to analog) (or A / D (analog to digital).
[087] For convenience of description, the hybrid beam-forming structure can be represented by N transceiver units (TXRUs) and M physical antennas. In this case, the digital beam formation for L data layers to be transmitted by the transmission end can be represented by the N * L matrix (N by L). Subsequently, N converted digital signals are converted into analog signals by TXRUs, and then the analog beam formation, which can be represented by the M * N matrix (M by N), is applied to the converted signals.
[088] Figure 5 is a schematic diagram illustrating a hybrid beam-forming structure according to an embodiment of the present invention from the perspective of TXRUs and physical antennas. In Figure 5, it is assumed that the number of digital beams is L and the number of analog beams is N.
[089] Additionally, a method for providing efficient beam formation to UEs located in a specific area by projecting an eNB capable of altering an analog beam formation on a symbolic basis was considered in
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20/73 NR system to which the present invention is applicable. In addition, a method of introducing a plurality of antenna panels where an independent hybrid beam formation can be applied by defining N TXRUs and M RF antennas as an antenna panel has also been considered in the NR system to which the present invention is applicable .
[090] When the eNB uses a plurality of analog beams as described above, each UE has a different analog beam suitable for signal reception. Therefore, the beam scan operation where the eNB applies a different analog beam per symbol in a specific slot (at least e, in relation to synchronization signals, system information, pagination, etc.) and then perform signal transmission in order to allow all UEs to have reception opportunities they were considered in the NR system to which the present invention is applicable.
[091] Figure 6 is a diagram that schematically illustrates the beam scanning operation for synchronization signals and system information during a downlink transmission (DL) process according to an embodiment of the present invention.
[092] In Figure 6, a physical resource (or channel) for transmitting system information from the NR system to which the present invention is applicable in a broadcast mode is referred to as a physical broadcast channel (xPBCH). In this case, analog beams belonging to different antenna panels can be simultaneously transmitted in a symbol.
[093] In addition, as described in Figure 6, the introduction of a beam reference signal (BRS) corresponding to the reference signal (RS) to which a single analog beam (corresponding to a specific antenna panel) was applied was discussed as the configuration for measuring an analog beam channel in the NR system to which the present invention is applicable. BRS can be set to
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21/73 a plurality of antenna ports, and each BRS antenna port may correspond to a single analog beam. In this case, unlike BRS, all analog beams in the analog beam group can be applied to the sync signal or xPBCH differently from BRS to assist a random UE to correctly receive the sync signal or xPBCH.
1.5. PT-RS (Phase trace reference signal)
[094] From now on, phase noise is described. Jitter, which occurs in the time domain, can appear as a phase noise in the frequency domain. This phase noise randomly changes the phase of the signal received in the time domain as shown in the following equation. [EQUATION 1] ^r n = _S n ^q J ' ^{ón N-1} where s _n = yd _k and ^N k = 0 rsd ó
[095] In Equation 1, the parameters ⁿ , ⁿ , ^k indicate a received signal, a time domain signal, a frequency domain signal, and a phase rotation value due to phase noise, respectively. When the
DFT (discrete Fourier transform) is applied to the signal received in Equation 1, Equation 2 is obtained.
[EQUATION 2] i N-1 yk = ^d Σ ^e + n = 0
N-1 N-1 ¹ ydye ^Job ne ^{J 2π (} - ^k ) ^{m / N} t fk
[096] In Equation 2, the parameters i N-1 —y ^J
N ~ 0
N-1 N-1 ¹ ydy 2 ^{π !: k} ) m / n ^N t = 0 n = 0 t fk indicate a common phase error (CPE) and inter-cell interference (ICI), respectively. In this case, as the phase noise correlation increases, the CPE value in Equation 2 increases. This CPE can be considered a type of carrier frequency shift in a WLAN system, but from the
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22/73 perspective of the UE, the CPE and the CFO can be interpreted as being similar to each other.
[097] By performing a CPE / CFO estimate, the UE can eliminate CPE / CFO corresponding to the phase noise in the frequency domain. In addition, to correctly decode a received signal, the UE must perform the CPE / CFO estimate before decoding the received signal. Correspondingly, the eNB can transmit a given signal to the UE in order for the UE to carry out the CPE / CFO estimate precisely. That is, the main purpose of this signal is to estimate the phase noise. In this sense, a pilot signal previously shared between the eNB and the UE in advance can be used, or a data signal can be changed or duplicated. In this specification, a series of signals to estimate phase noise is commonly referred to as the phase compensation reference signal (PCRS), phase noise reference signal (PNRS), or phase tracking reference signal (PT- LOL). Henceforth, for convenience of description, they are all referred to as PT-RS.
1.5.1. Time domain pattern (or time density)
[098] Figure 7 is a diagram illustrating a PT-RS time domain pattern applicable to the present invention.
[099] As shown in Figure 7, a PT-RS may have a different standard according to an MCS (Modulation and Coding Scheme) level.
[TABLE 4]
MCS level PT-RS time pattern (64QAM, CR = 1/3 <= MCS <(64QAM, CR = 1/2) # 3 (64QAM, CR = 1/2 <= MCS <(64QAM, CR = 5/6) #2 (64QAM, CR = 5/6 <= MCS #1
[0100] As shown in Figure 7 and Table 4, a PT-RS can be transmitted in order to be mapped with a different pattern according to a
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[0101] More generally, the previous configuration can be defined as follows. In particular, a time domain pattern (or time density) of PT-RS can be defined as a table described below.
[TABLE 5]
Scheduled MCS Time density (Lpt-rs) Imcs <ptrs-MCS1 PT-RS is not present ptrs-MCS1 <Imcs <ptrs-MCS2 4 ptrs-MCS2 <Imcs <ptrs-MCS3 2 ptrs-MCS3 <Imcs <ptrs-MCS4 1
[0102] In this case, time density 1 corresponds to pattern # 1 in Figure 7, time density 2 corresponds to pattern # 2 in Figure 7, and time density 4 can correspond to pattern # 3 of Figure 7.
[0103] The parameters ptrs-MCS1, ptrs-MCS2, ptrs-MCS3 and ptrs-MCS4 that build Table 5 can be defined by an upper layer signal.
1.5.2. Frequency domain pattern (or frequency density)
[0104] A PT-RS according to the present invention can be transmitted so that it is mapped to 1 carrier for each 1 RB (Resource Block), 2 RBs or 4 RBs. In this case, a frequency domain pattern (or frequency density) of the PT-RS can be configured according to a size of a scheduled bandwidth.
[0105] For example, a frequency domain pattern can have a frequency density shown in Table 6 according to a scheduled bandwidth.
[TABLE 6]
Scheduled BW Frequency density 0 <Nrb <= 4 No PT-RS 5 <Nrb <= 8 1 9 <Nrb <= 16 1/2
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Scheduled BW Frequency density 17 <Nrb <= 32 1/4
[0106] In this case, frequency density 1 corresponds to a frequency density pattern that a PT-RS is transmitted in order to be mapped to 1 subcarrier every 1 RB. The frequency density 1/2 corresponds to a frequency density pattern that a PT-RS is transmitted in order to be mapped to 1 subcarrier every 2 RBs. The frequency density 1/4 corresponds to a frequency density pattern that a PT-RS is transmitted in order to be mapped to 1 subcarrier every 4 RBs.
[0107] More generally, the previous configuration can be defined as follows. In particular, a frequency density pattern (or frequency density) of the PT-RS can be defined as a table described below.
[TABLE 7]
Scheduled bandwidth Frequency density & en-RS) Λ / rb <Nrbo PT-RS is not present Nrbo <Nrb <Nrbi 2 Nrbi <Nrb 4
[0108] In this case, frequency density 2 corresponds to a frequency density pattern that a PT-RS is transmitted in order to be mapped to 1 subcarrier every 2 RBs and frequency density 4 corresponds to a density pattern of frequency that a PT-RS is transmitted in order to be mapped to 1 subcarrier every 4 RBs.
[0109] In the previous configuration, NRB0 and NRB1 corresponding to the reference values of a bandwidth scheduled to determine a frequency density can be defined by an upper layer signaling.
1.6. DM-RS (Demodulation reference signal)
[0110] In the NR system to which the present invention is applicable, a DM-RS
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25/73 can be transmitted and received through a structure loaded from the front. Or, an additional DM-RS from the front loaded DM-RS can be additionally transmitted and received.
[0111] A DM-RS loaded from the front can support fast decoding. The first OFDM symbol on which the front loaded DM-RS is loaded can be determined by the 3rd (for example, l = 2) or the 4th OFDM symbol (for example, l = 3). A location of the first OFDM symbol can be indicated by a PBCH (Physical Broadcasting Channel).
[0112] The number of OFDM symbols occupied by the DM-RS loaded from the front can be indicated by a combination of DCI (Downlink Control Information) and RRC (Radio Resource Control) signaling.
[0113] The additional DM-RS can be configured for high speed user equipment. The additional DM-RS can be located on the intermediate / last symbols within a slot. When a DM-RS symbol loaded from the front is configured, the additional DM-RS can be assigned 0 to 3 OFDM symbols. When two DM-RS symbols loaded from the front are configured, the additional DM-RS can be assigned to 0 or 2 OFDM symbols.
[0114] The DM-RS loaded from the front is configured by two types and one of the two types can be indicated through an upper layer signaling (for example, RRC signaling).
[0115] Figure 8 is a diagram that briefly illustrates two types of DM-RS configurations applicable to the present invention.
[0116] In Figure 8, P0 to P11 can correspond to port number 1000 to 1011, respectively. A type of DM-RS configuration actually fitted to a user equipment from among the two types of DM-RS configuration can be indicated by an upper layer signaling (for example, RRC).
[0117] The DM-RS type 1 configuration can be classified as follows
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26/73 form according to the number of OFDM symbols to which a front loaded DM-RS is assigned.
[0118] DM-RS type 1 configuration and the number of OFDM symbols to which a front-loaded DM-RS is assigned = 1
[0119] A maximum of 4 ports (for example, P0 ~ P3) can be multiplexed based on F-CDM length-2 (Frequency Code Division Multiplexing) and FDM (Frequency Division Multiplexing) methods. RS density can be configured for 6 REs per port in a RB (Resource Block).
[0120] Type 1 DM-RS configuration and the number of OFDM symbols to which a front loaded DM-RS is assigned = 2
[0121] A maximum of 8 ports (for example, P0 ~ P7) can be multiplexed based on methods F-CDM length-2 (Frequency Code Division Multiplexing), T-CDM length-2 (Code Division Multiplexing) and FDM (Frequency Division Multiplexing). In this case, when the existence of a PT-RS is configured through an upper layer signaling, T-CDM can be fixed by [1 1]. RS density can be configured for 12 REs per port in an RB.
[0122] The DM-RS type 2 configuration can be classified as follows according to the number of OFDM symbols to which a front-loaded DM-RS is assigned.
[0123] Type 2 DM-RS configuration and the number of OFDM symbols to which a front loaded DM-RS is assigned = 1
[0124] A maximum of 6 ports (for example, P0 ~ P5) can be multiplexed based on F-CDM length-2 and FDM methods. RS density can be configured for 4 REs per port in an RB (Resource Block).
[0125] DM-RS type 2 configuration and the number of OFDM symbols to which a front-loaded DM-RS is assigned = 2
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[0126] A maximum of 12 ports (for example, P0 ~ P11) can be multiplexed based on F-CDM length-2, T-CDM length-2 and FDM methods. In this case, when the existence of a PT-RS is configured through an upper layer signaling, T-CDM can be fixed by [1 1]. RS density can be configured for 8 REs per port in an RB.
[0127] Figure 9 is a diagram that briefly illustrates an example for a DM-RS loaded in front of a type 1 DM-RS configuration applicable to the present invention.
[0128] More specifically, Figure 9 (a) illustrates a structure that a DM-RS is first loaded into a symbol (a DM-RS loaded from the front with a symbol) and Figure 9 (b) illustrates a structure that a DM-RS is first loaded in two symbols (a DM-RS loaded in front with two symbols).
[0129] In Figure 9, Δ corresponds to a displacement value of DM-RS on a geometric frequency axis. In this case, DM-RS ports having the same Δ can be CDM-F (frequency domain code multiplexing) or CDM-T (time domain code division multiplexing). And, DM-RS ports having a different Δ can be CDM-F.
[0130] A user device can obtain information on a DM-RS port configuration configured by a base station via DCI.
1.7. DM-RS port group
[0131] In the present invention, a DM-RS port group can correspond to a set of DM-RSs having a QCL (almost colocalized) relationship or a partial QCL relationship. In this case, the QCL relationship means that a channel environment such as Doppler dispersion and / or Doppler shift is the same. The partial QCL relationship means that a partial channel environment is the month.
[0132] Figure 10 is a diagram that briefly illustrates an operation that
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28/73 a user equipment trans-receives a signal with a single base station using two groups of DM-RS port.
[0133] As shown in Figure 10, a user equipment (UE) can include two panels. In this case, a single base station (for example, TRP (Transmission Reception Point), etc.) can be connected to the UE via two beams. In that case, each of the beams can correspond to a single DM-RS port group. This is because the DM-RS ports defined for a different panel cannot be QCLed in the aspect of Doppler dispersion and / or Doppler shift.
[0134] Or, according to a different modality, a single DM-RS port group can be configured by a plurality of panels of a UE.
[0135] When DCI is defined according to a DM-RS port group, a UE can transmit a different CW (Code Word) according to a DM-RS port group. In that case, a single DM-RS port group can transmit one or two CWs. More specifically, when the number of layers corresponding to a DM-RS port group is equal to or less than 4, the DM-RS port group can transmit an aCW. When the number of layers corresponding to a DM-RS port group is equal to or greater than 5, the DM-RS port group can transmit two CWs. And, different DM-RS port groups can have a different scheduled BW.
[0136] When a single DCI is defined for all DM-RS port groups participating in an UL broadcast, the DM-RS port groups can transmit one or two CWs. For example, when the total number of layers transmitted in two DM-RS port groups is equal to or less than 4, a CW is transmitted. On the other hand, when the total number of layers is equal to or greater than 5, two CWs can be transmitted.
[0137] According to the present invention, the number of gate groups
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DM-RS in UL can be adjusted to a UE through SRI (SRS Resource Indication). For example, when the SRI adjusts two beams to a UE, the UE and a base station can consider them as two DM-RS port groups that are tuned to the UE. According to an example of the present invention, the aforementioned configuration can be applied only to a UL transmission based on codebook.
[0138] Or, according to the present invention, the number of DM-RS port groups in UL can be adjusted to a UE through the number of SRS resource settings. For example, when a plurality of SRIs belonging to two different SRS resource sets are tuned to a UE, the UE and a base station can consider them as two DM-RS port groups that are tuned to the UE. According to an example of the present invention, the aforementioned configuration can only be applied to a UL transmission not based on a codebook.
1.8. DCI format in NR system
[0139] In the NR system to which the present invention is applicable, it is capable of supporting DCI formats described below. The NR system can support a DCI format 0_0 and a DCI format 0_1 as a DCI format to schedule PUSCH and support a DCI format 1_0 and a DCI format 1_1 as a DCI format to schedule PDSCH. And, the NR system can also support a DCI 2_0 format, a DCI 2_1 format, a DCI 2_2 format and a DCI 2_3 format as DCI formats capable of being used for other purposes.
[0140] In this case, the DCI format 0_0 is used to schedule TB (Transmission Block) based PUSCH (or TB level) and the DCI 0_1 format can be used to schedule TB (Transmission Block) based PUSCH. (or TB level) or CBG-based PUSCH (or CBG level) (when a
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30/73 signal transmission / reception based on CBG (Code Block Group) is configured).
[0141] And, DCI format 1_0 is used to schedule TB-based PDSCH (or TB level) and DCI format 1_1 can be used to schedule TB-based PDSCH (or TB level) or CBG-based PDSCH (or CBG level) (when a CBG-based signal transmission / reception is configured).
[0142] And, the DCI 2_0 format is used to indicate a slot format, the DCI 2_1 format is used to indicate a PRB and an OFDM symbol that a specific UE does not assume a desired signal transmission, the DCI 2_2 format is used to transmit PUCCH and PUSCH TPC (Transmission Power Control) commands, and the DCI 2_3 format can be used to transmit a TPC command group to transmit an SRS transmitted by one or more UEs.
[0143] A specific feature of the DCI format can be supported by 3GPP TS 38.212. In particular, among the characteristics related to the DCI format, steps and apparent parts, which are not explained, can be explained with reference to the document. And, all the terminology revealed in this specification can be explained by the standard document.
1.9. Transmission schemes
[0144] The NR system to which the present invention applies supports two transmission schemes described below for PUSCH: transmission based on codebook and transmission not based on codebook.
[0145] According to a modality to which the present invention is applicable, when txConfig in an upper layer parameter PUSCH-Config, which is transmitted through an upper layer signaling (for example, RRC signaling), is configured by 'codebook', a codebook-based transmission can be adjusted to a UE. On the other hand, when the txConfig in the upper layer parameter PUSCH-Config is configured by ‘not book
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31/73 code ', a non-codebook based transmission can be adjusted to the UE. If the upper layer parameter txConfig is not configured, a PUSCH transmission, which is activated by a specific DCI format (for example, DCI format 0_0, and the like, defined in 3GPP TS 38.211), can be performed based on a single PUSCH antenna port.
[0146] In the description below, a classification has the same meaning as the number of layers. For reasons of convenience of explanation, in the description below, the related technical resources are described based on the term Ό number of layers ’.
1.9.1. Codebook-based UL transmission
[0147] When a UE performs a coherent transmission through a different panel, the beam formation accuracy may be deteriorated due to phase noise. In particular, when there is a phase noise, a UE can perform a non-coherent transmission through different panels.
[0148] Before a detailed explanation of a coherent transmission and a non-coherent transmission, a basic signal operation configuration of the present invention is described below.
[fully coherent] [non-coherent] [artially coherent]
antennas1 1 1 1 'Ί 0 0 0 'Ί 1 0 0 ’ 1 1 -] l -l 1 Ü 1 0 0 l 0 0 1 1 4 j j -j -j 2 0 0 1 0 2V2 j -J 0 0 J -j -J -j.0 0 0 d0 0 J -THE
layers
[0149] As previously illustrated, a row (horizontal) direction of a precoding matrix corresponds to a specific (physical) antenna and a column (vertical) direction of a precoding matrix can correspond to a specific layer. .
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[0150] In this case, each antenna can be mapped to an RF chain by 1: 1. In this case, the RF chain can correspond to a processing block where a single digital signal is converted to an analog signal.
[0151] In this case, a coherent transmission can correspond to an operation that a layer (or data from a layer) performs a transmission through all antennas.
[0152] More specifically, when a signal is transmitted based on a fully coherent pre-coding matrix, a signal transmitted through each antenna can be generated as follows in a base band.
[EQUATION 3]
'] 1 1 1 χ, + χ, + χ, + χ, 1 ] -í 1 -1 There 1 X ₍ - X, + x. - x ₄ - -4 / i -. / -. / THE 4 A, + .A; - ./A - A/ -. / -. / - / THE, Αί -, a _; -, A- -, Aj
itvro-codiff sinai data transmitted
[0153] For example, according to the previous example, the signal 1/4 (X1 + X2 + X3 + X4) is generated for an antenna 1 and the signal 1/4 (X1 - X2 + X3 - X4) can be generated for an antenna 2.
[0154] In contrast, a non-coherent transmission can correspond to an operation that a layer (or data from a layer) carries out a transmission through a specific antenna corresponding to the layer.
[0155] More specifically, when a signal is transmitted based on a non-coherent pre-coding matrix, a signal transmitted through each antenna can be generated as follows in a base band.
[EQUATION 4]
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[0156] In this case, a signal is generated in a base band due to a reason described below.
[0157] In the aforementioned RF antenna chain configuration, an RF chain connected to each antenna corresponds to a combination of multiple RF elements. Each of the RF elements can generate a unique distortion (for example, phase shift, amplitude attenuation).
[0158] In particular, when the distortion is negligible, there may be no problem. However, if a distortion value is significant, beam formation can be affected.
[0159] For example, in an equation described below, a specific matrix (for example, matrix shifted in phase due to an RF deficiency) is further described to express the contamination of a signal that has passed through an RF chain.
In this case, if there is no distortion, the matrix becomes an identity and matrix.
[EQUATION 5]
P 0 0 0 ’1 ! 1 ' c · ^ *10 0. L 0 0 1 -1 ΐ -1J-and* *2 4 0 00 ./-. / -j4 -ey * 0 0 0 -j ~ j -J. -ie * - / ^. Λ.
Corrupted code-book fingers unbalance of fesis Code-book fingers due to insufficient RF
[0160] In equation 5, it is necessary to transmit data like X1 in a vector direction like [1 1 j j], However, due to the distortion generated by a chain
Γ J @ l j & 2 '7 ¹ ¾' Í & A Ί of RF, data is transmitted in a direction of U ^and J ^and 7 ^and J. In particular, as values of 01 02, 03, 04 become larger, a direction of
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34/73 signal transmission can be considerably changed from an original direction.
[0161] In this case, although distortions generated by 4 RF chains are large, if the distortion sizes are all the same, there may not be a
Γ jôy jôy · jôy · jôy 1 j θγ Γ1 1 * * 1 problem. This is because, since ^e J ^and J ^e v 'J _a beam direction is not changed regardless of a size of Θ1.
[0162] And particularly, when the distortion of the RF chain is large, as illustrated in equation 6, it may be preferable not to carry out a beam formation (ie, a non-coherent transmission scheme).
[EQUATION 6]
0 0 0 *Ί 0 0 0 ' 0 0 0 ' U, 1 1 00 00 1 0 0 .V, ₌ 1 00 0 .V, 4 0 0 and* 00 0 1 04 0 0 and* 0 laughí) 0 0 0 0 0 ΐ ^V 40 0 0 and'* -V,
phase shift book-code fingers code book corrupted data due to insufficiency of RF
[0163] Referring to equation 6, a distortion-contaminated codebook and an uncontaminated codebook have a difference like ej61, ej62, ej63, ej64 only in the X1 data aspect. Consequently, the distortion can be corrected when estimating a channel.
[0164] In particular, when a distortion of an RF chain is not significant or distortions generated by all RF chains are the same, it may be preferable to transmit a signal using a fully coherent codebook capable of performing a digital beam formation . Or, when each RF chain has a different distortion and the size of the distortion is large enough to affect a beam formation, it may be preferable to transmit a signal using a non-coherent codebook unable to perform a digital beam formation.
[0165] Furthermore, in the case of a codebook partially coherent with a classification of 4 (or a codebook partially coherent for 4 layers), since a characteristic of an RF chain connected to an antenna 1 is
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35/73 similar to the characteristic of an RF chain connected to an antenna 3, it can be considered that the distortions generated by the RF chains are the same. The above relationship can be similarly applied to an antenna 2 and an antenna 4 as well.
[0166] In particular, in the case of the partially coherent codebook with classification 4 (or the partially coherent codebook for 4 layers) (for example, TPMI index 1 or 2 in Table 13), a transmitter (for example, UE ) transmits a signal using a coherent transmission scheme for an antenna 1 and an antenna 3 (or an antenna 2 and an antenna 4) and can transmit a signal using a non-coherent scheme between antenna 1 and antenna 2. The aforementioned feature can be verified through the TPMI indexes 4 to 11 in Table 9, TPMI indexes 6 to 13 in Table 11, and TPMI indexes 1 to 2 in Table 12.
[0167] On the other hand, when an MCS (Coding Modulation Scheme) is low, an impact due to phase noise is not so great (ie, marginal). In particular, the accuracy of beam formation may not be considerably deteriorated (i.e., marginal). In that case, preferably, a UE can perform a coherent combination.
[0168] However, the impact due to phase noise is different in relation to an RF (Radiofrequency). In particular, an expensive RF element can have very little phase noise.
[0169] In particular, the NR system applicable to the present invention can support a non-coherent transmission and a coherent transmission.
[0170] In order to carry out a codebook-based transmission, a UE determines a subset of codebooks based on the receipt of a TPMI (Transmitted Pre-Coding Matrix Indicator) and a codebookSubset included in a PUSCH-Config upper layer signaling. In this case, the codebookSubset can be configured by one selected from the group consisting of ‘fullAndPartialAndNonCoherent’, ‘partialAndNonCoherent’ and
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36/73 ‘noncoherent’ depending on the UE capacity indicating a codebook capable of being supported by the UE. In this case, ‘fullAndPartialAndNonCoherent’ indicates that the UE is capable of supporting a fully coherent codebook, a partially coherent codebook and a non-coherent codebook. 'PartialAndNonCoherent' indicates that the UE is capable of supporting a partially coherent codebook and a non-coherent codebook. 'NonCoherent' indicates that the UE is capable of supporting a non-coherent codebook only.
[0171] In this case, the maximum transmission classification (or the number of layers) applied to the codebook can be configured by maxrank included in the upper layer signaling PUSCH-Config.
[0172] Having reported ‘partialAndNonCoherent’ as an UE capability of the UE, the UE does not expect the Subset codebook to be configured by ‘fullAndPartialAndNonCoherent’. This is because, as mentioned in the previous description, if the UE reports ‘partialAndNonCoherent’ as an UE capacity of the UE, it means that the UE does not support a signal transmission based on a fully consistent codebook. In particular, the UE may not expect a configuration (ie, codebook subset is configured by ‘fullAndPartialAndNonCoherent’) to transmit a signal based on the fully consistent codebook.
[0173] Similarly, having reported ‘nonCoherent’ as an UE capability of the UE, the UE does not expect the Subset codebook to be configured by ‘fullAndPartialAndNonCoherent’ or ‘partialAndNonCoherent’.
[0174] The NR system to which the present invention is applicable supports two options using UL waveforms: one is CP-OFDM (Cyclic Prefix Orthogonal Multiplexing by Frequency Division) and the other is DFT-s-OFDM (Discrete Transform of Fourier- dispersion- Orthogonal Multiplexing by Frequency Division). In this case, in order to generate the DFT-s-OFDM waveform, it is
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37/73 it is necessary to apply a transform pre-coding.
[0175] When transform pre-coding is disabled for a UE according to the present invention or the UE is unable to apply transform pre-coding, the UE uses the CP-OFDM waveform as a waveform in uplink. In contrast, when transform pre-coding is enabled for the UE or the UE is able to apply transform pre-coding, the UE uses the DFT-s-OFDM waveform as an uplink waveform.
[0176] In the following description, when a transform precoding is disabled for a specific UE or the specific UE is unable to apply the transform precoding, it is commonly referred to as a case where the precoding of a transform transformed is disabled.
[0177] In this case, a pre-encoder W, which is determined to carry out a transmission based on codebook, can be determined based on the number of transmission layers, the number of antenna ports, and a TPMI included in DCI to schedule a transmission and UL according to the table described below.
[0178] Table 8 illustrates a W precoding matrix to perform a single layer transmission using 2 antenna ports and Table 9 illustrates a W precoding matrix to perform a single layer transmission using 4 antenna ports. with a transform pre-coding disabled.
[TABE LA 8] index ofTPMI W(ordered from left to right in ascending order of index ofTPMI) 0-5 F. M i pi i ΓιΊ ¹ 77 i 77 L- d ¹ 'Ί 77 jJ i Γ i '77 L -. < - -
[TABLE 9]
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index ofTPMI W(ordered from left to right in ascending order of index ofTPMI) 0-7 1 0 'θ: y 1 ‘0’10u 1 'The'0í0yi Í o ¹ Ã>: '1 1 T01 12 ~ J ~ o ¹ -i: t2 T07_0_1 1 Ί0"7í) J 8-15 1 i;0 1 -JÍL _i 1 '0'í0_7_] 'o 1 j I o 1 -; j 22 III-1 1π η j |7 I < 12 1-1_ 1 _12 ' 1 ]1-. / 16-23 22 Ύ i1j. y j jJ_ Γ1 ί- iT r- f 7-12 'j'i-j 22 ^r t '-1 1 _ 1 _ 2 ' 1 '-]j22 -1-1_-l_2 1 ]-1-7. 7 'J 24-27 Γ 1 '2' ¹ I -, /. 2Ϊ 11-j j-1 22 1- J-172 ’11-j -j1 j - - - -
[0179] Table 10 illustrates a W pre-coding matrix to perform a 2-layer transmission using 2 antenna ports with a transform pre-coding disabled, Table 11 illustrates a W pre-coding matrix to perform a transmission. 2-layer using 4 antenna ports with a pre-encoded transform disabled, Table 12 illustrates a pre-encoding matrix W to perform a 3-layer transmission using 4 antenna ports with a pre-encoded transform disabled, and Table 13 illustrates a W pre-coding matrix to perform a 4-layer transmission using 4 antenna ports with a transform pre-coding disabled.
[TABLE 10]
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index ofTPMI W(ordered from left to right in ascending order of index ofTPMI) 0-2 ί Γ i οΊ d 1 ΙΊ 11 ι Γι J 14 / -J
[TABLE 11]
index ofTPMI W(ordered from left to right in ascending order of index ofTPMI) 0-3 Γ'ΐ o 'il 0 1 —12í0 0_0 0]2 Ί 3) 10 Íji o d 0 üj li] 0 '110 o “o oIo 12 0 d1 ill0 110 nL _i 4-7 2 :Ο o: 1 0 οο io ^! 12 0 tq 0 hi ^{1 fl} ! 0 1 i l_ 1 ^: 2- 1 00 11 00 -J_12 ] ü '0 1] 0 _ ^ΰ Λ8-11 £2 1 00 l-J 00 1£ 1 Ü0 l-J 00 -]J i- I i i 0 0 í -1 0 ⁰ - !._l_2 i ol0 I -1 hi0; 12-15 12 Π o ’1 0 l 1 / »I 0 1£ί Ί 0 u 1j 0: 1ΞϋΤΪ 1 1 'i! ^r ϊ -r 1 -1 íi Π 1Il il 1 2V2 i; -J16-19 l2 ^ 2 Ί 1 'j j1 -1./1 1 lJ jJ -J -1 1l_ r l2 ^ 2 1 l-1 -1 --1 1ϊ2 ^ 2 ‘1 J-1 -1J20-21 - J7/21 1 1~ Í ~ Íl -1 -J 712v7 1 ]-J -J/ -JL -l- -
[TABLE 12]
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index ofTPMI W(ordered from left to right in ascending order of index ofTPMI) 0-3 £2 '1 (J 01) 100 (j 1_0 (i) 0.£2 Ί 0 o0 l 01 0 00 0 12 'ί 0 Í) “() 1 0- [li 00 (1 1]2 ^ 3 “Ί i 1Ί1 -I 1] l -l j -d 4-6 J_2 ^ 3 ‘11 Γ1 -1 17 7.7 -7 ]2-Λ 1 1 1-1 í -È1 1 -t-11 1i J 1 1-1 1 -17 J -, i -j J 7. -
[TABE LA 13] index ofTPMI W(ordered from left to right in ascending order of index ofTPMI) 0-3 71 0 0 o ’10 l 0 02 * Ü 0 l 0[o 0 0 1_]14Ϊ Ί i 0 0] 0 0 1] r1 -1 (1 0! 0 0 1 -1] Γ1 l 0 0 1 ^ 001 1 2V2Í7 - / 0 0 [o ⁰ j -Á71 1 J J ’lú -1] -t 41 1 -1-1Í1 -1 -1 14 4 ! 1 ί ί1-11j; -ί -j-j -j 7 j - - -
1.9.2. Transmission in LIL not based on codebook
[0180] When a plurality of SRS resources are configured to perform a non-codebook based transmission, a UE can determine a PUSCH precoder and a transmission classification (or the number of layers) based on an SRI (audible reference signal feature indicator) (broadband). In that case, the SRI can be provided via DCI or an upper layer signaling.
[0181] In this case, the determined precoder may correspond to an identity matrix.
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2. Proposed modality
[0182] The following explains a configuration proposed in the present invention in greater detail based on the aforementioned technological idea.
[0183] In the present invention, a precoder or a precoding matrix corresponds to a transmission matrix used by a UE to transmit a UL PT-RS.
[0184] In the present invention, the UL PT-RS power intensification corresponds to an UE operation that increases the transmission power of an UL PT-RS port compared to the PUSCH transmission power for a single layer. In particular, a UL PT-RS power boost level may indicate a transmit power level for a UL PT-RS port compared to the PUSCH transmit power for a single layer.
[0185] In other words, according to the present invention, a UL PT-RS power boost level for a specific PT-RS port can correspond to a value that indicates a transmission power level of the PT-RS port that is enhanced based on a PUSCH layer connected (or related) to the PT-RS port. Or, according to the present invention, a UL PT-RS power boost level of a specific PT-RS port can correspond to a value that indicates a transmission power level of a PTRS, which is transmitted on the PT- RS port. Specific RS, based on the PUSCH transmission power in a layer connected (or related) to the PT-RS port.
[0186] In the present invention, a UL PT-RS power boost may include a power boost (or power share) according to multiple PT-RS ports and / or power boost (or power share) according to with multiple layers.
[0187] First, the power boost according to multiple PT-RS ports can be applied when two PT-RS ports are set to
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42/73 a UE. More specifically, when a first PT-RS port and a second PT-RS port (that is, the number of PT-RS ports is 2) are set to a UE, the UE lends power from an element of resource in which the second PT-RS port (or the first PT-RS port) is transmitted to transmit a PTRS by intensifying power from the first PT-RS port (or the second PT-RS port).
[0188] In this case, each PT-RS port set to the UE can be assigned to a different subcarrier to which a related (or corresponding) DM-RS port is assigned. In particular, PT-RSs respectively corresponding to the two PT-RS ports can be assigned to a different subcarrier, that is, a different resource element.
[0189] In the following description, an expression like 'matches' can be replaced by an expression like 'related to' or 'associated with'.
[0190] Power intensification according to multiple layers can be applied when a plurality of layers is configured in association with a single PT-RS port. More specifically, when two layers associated with a single PT-RS port are fitted to a UE, the UE can transmit a PT-RS through power intensification between the layers via the single PT-RS port (or using the single PT-RS port).
[0191] In addition, a method of borrowing power from a different antenna port (for example, CSI-RS, etc.) that is not used for power intensification of PT-RS can be considered. In this sense, it is necessary to have a power amplifier having a more dynamic range. In particular, you may have a problem where the costs of implementing EU increase.
[0192] In the present invention, a configuration of applying a power boost (or power share) according to multiple PT-RS ports and / or power boost (or
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43/73 power) according to multiple layers is explained in detail as a PT-RS UL port power intensification method.
[0193] Next, a PT-RS power intensification method to perform a codebook-based UL transmission or a non-codebook-based UL transmission and a method for transmitting a PT-RS based on the method PT-RS power intensification systems are explained in detail based on the aforementioned technological idea.
[0194] In accordance with the present invention, a UE can report a UE capability indicating that the UE is capable of supporting fully coherent, partially coherent or non-coherent to a base station. In that case, when the UE is able to support fully coherent, it means that the UE is able to transmit a PT-RS based on a fully coherent pre-coding matrix, a partially coherent pre-coding matrix and a matrix of non-coherent pre-coding. Similarly, when the UE is able to support partially coherent, it means that the UE is able to transmit a PT-RS based on a partially coherent pre-coding matrix and a non-coherent pre-coding matrix. When the UE is able to support non-coherent, it means that the UE is able to transmit a PT-RS based on a non-coherent pre-coding matrix only.
[0195] Subsequently, the base station can provide the UE with information about a pre-coding matrix (for example, TPMI (Transmitted Pre-Coding Matrix Indicator) and a TRI (Transmission Classification Indicator). Specifically, the base station can provide the UE with information (for example, TPMI and TRI) about the pre-coding matrix via DCI (Downlink Control Information) .Or, the base station can provide the UE with information indicating information (for example, TPMI and TRI) about the pre-coding matrix via layer signaling
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44/73 higher (for example, RRC signaling).
[0196] When the UE reports that the UE is able to fully support the base station, the base station can transmit information (for example, TPMI, TRI, etc.) in a pre-coding matrix selected from the matrix of fully coherent pre-coding, the partially coherent pre-coding matrix and the UE non-coherent pre-coding matrix.
[0197] When the UE reports that the UE is able to partially support the base station, the base station can transmit information (for example, TPMI, TRI, etc.) in a pre-coding matrix selected from the matrix partially coherent pre-coding and the non-coherent pre-coding matrix to the UE.
[0198] When the UE reports that the UE is capable of supporting non-coherent to the base station, the base station can transmit information (for example, TPMI, TRI, etc.) in a non-coherent pre-coding matrix to the UE .
[0199] The information about the pre-coding matrix can correspond to the information in a pre-coding matrix among the pre-coding matrices illustrated in Tables 9 to 14 (or information indicating a pre-coding matrix among the matrices of pre-coding). In this case, a fully coherent pre-coding matrix corresponds to a matrix that all element values in the matrix are not 0. A non-coherent pre-coding matrix corresponds to a matrix that has a maximum number of elements whose value is not 0 in each row corresponds to 1 and the number of elements whose value is not 0 in each column corresponds to 1. A partially coherent pre-coding matrix corresponds to a matrix that is neither a fully coherent matrix nor a non-coherent matrix.
[0200] The UE determines a power intensification level of PT-RS in uplink based on a pre-coding matrix configured by
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45/73 base station and can transmit PT-RS based on the power intensification level of PT-RS in determined uplink. More specifically, the UE can transmit PT-RS based on the level of PTRS uplink power intensification that is determined through a related (corresponding) UL layer according to a configured PT-RS port.
[0201] The following explains in detail a method for determining a PT-RS power intensification level based on a configured pre-coding matrix.
In the case of a fully coherent pre-coding matrix
[0202] Figure 10 is a diagram illustrating an example for configuring a fully coherent pre-coding matrix according to an embodiment of the present invention.
[0203] As mentioned in the previous description, a fully consistent pre-coding matrix can correspond to a matrix in which all element values of the matrix are not 0.
[0204] When a UE reports the UE capacity indicating that the UE is capable of supporting the fully coherent pre-coding matrix, the UE can expect that the number of PT-RS ports corresponds to 1. In particular, in the present invention, when the fully coherent pre-coding matrix is configured, only one PT-RS port can be adjusted to the UE.
[0205] In this case, a PT-RS power-up factor on the uplink or a power-up level can satisfy the following equation.
[EQUATION 7]
10xlog ₁₀ (X)
[0206] In this case, X can correspond to the number of layers (PUSCH) configured in association with a single PT-RS port.
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[0207] For example, as shown in Figure 10, when a pre-coding matrix corresponding to a TPMI 4 index in Table 13 is fitted to a UE and an UL PT-RS port is associated with a layer # 0, it can be assumed that a pre-encoder of the PT-RS port corresponds to a pre-coding matrix corresponding to a TPMI 13 index in Table 9. In this case, the information that indicates that the UL PT-RS port is associated with the layer # 0 can be forwarded to the UE via DCI or RRC signaling. In other words, the UL PT-RS port can be associated with a layer # 1, a layer # 2 or a layer # 3 instead of layer # 0 depending on a modality, the information can be forwarded to the UE via DCI or RRC signaling.
[0208] Since the UE is able to lend power from another 3 layers, the UE is able to configure EPRE (Energy per Resource Element) compared to PUSCH by 6 dB while maintaining a power restriction per antenna.
In the case of partially coherent pre-coding matrix
[0209] Figure 11 is a diagram illustrating an example of configuring a partially coherent pre-coding matrix according to a different embodiment of the present invention.
[0210] In the case of a partially coherent pre-coding matrix, each layer can be transmitted over one or two antenna ports.
[0211] In the case of a pre-coding matrix of maximum rating 3, antenna ports that transmit each layer are not overlapped. In particular, each layer is transmitted over a different antenna port.
[0212] On the other hand, in the case of a pre-coding matrix of a classification of 4, each layer is transmitted over two antenna ports and a pair of layers is transmitted over an antenna port belonging to the same set.
[0213] In particular, when a single PT-RS port is set, if a pre-coding matrix of maximum rating 3 is set for a UE, the UE
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47/73 is unable to perform UL PT-RS power intensification. On the other hand, if a pre-coding matrix of a rating of 4 is set for a UE, the UE can perform a maximum power boost of UL PT-RS of 3 dB with the help of overlapping antenna ports according to a layer .
[0214] As a different example, when two PT-RS ports are tuned to a UE, if the power is borrowed from mutated REs in the frequency domain, a UE to which a maximum rating 3 precoding matrix is tuned is capable of performing UL PT-RS power intensification to a maximum of 3 dB and a UE to which a rating 4 pre-coding matrix is fitted is capable of performing UL PT-RS power intensification to a maximum of 6 dB.
[0215] In this case, a PT-RS power-up factor on an uplink or a power-up level can satisfy the following equation.
[0216] First, a UE to which a partially coherent pre-coding matrix of classification 1, classification 2 or classification 3 is adjusted can perform UL PT-RS power intensification which satisfies the following equation.
[EQUATION 8] ioxiog ₁₀ (y)
[0217] In this case, Y corresponds to the number of UL PT-RS ports set to the UE and can have a value of 1 or 2.
[0218] Or, a UE to which a classification 4 partially coherent pre-coding matrix is fitted can perform UL PT-RS power intensification that satisfies the following equation.
[EQUATION 9]
10xlog ₁₀ (FZ)
[0219] In this case, Y corresponds to the number of UL PT-RS ports
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48/73 adjusted to the UE and can have a value of 1 or 2. E, Z corresponds to the number of PUSCH layers that share the same UL PT-RS port.
[0220] For example, as shown in Figure 11, when the pre-coding matrix corresponding to a TPMI 2 index in Table 13 is set to a UE and an UL PT-RS port is associated with a layer # 0, one can assume that a PT-RS port pre-encoder corresponds to a pre-coding matrix corresponding to a TPMI 2 index in Table 9. In this case, as mentioned in the description below, information that indicates that the UL port PT-RS is associated with layer # 0 can be forwarded to the UE through DCI or RRC signaling. In other words, the UL PT-RS port can be associated with a layer # 1 instead of layer # 0 depending on a modality and information can be forwarded to the UE through DCI or RRC signaling.
[0221] Since the UE is able to lend power from a different PT-RS port, the UE is able to configure EPRE (Energy per Resource Element) compared to PUSCH (PUSCH to PT-RS EPRE) by 3 dB while maintaining a power restriction per antenna.
[0222] On the other hand, when the pre-coding matrix corresponding to a TPMI 2 index in Table 12 is adjusted to a UE and an UL PT-RS port is associated with a layer # 0, it can be assumed that a pre-encoder of the PT-RS port corresponds to a pre-coding matrix corresponding to a TPMI 2 index of Table 11.
[0223] In this case, in order to maintain a power restriction per antenna, PUSCH to PT-RS EPRE must be 0 dB.
[0224] Additionally, when two UL PT-RS ports are set to the UE, an additional UL PT-RS port can be configured. The additional UL PT-RS port can be associated with a layer # 2 or a layer
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49/73 # 3 via DCI or RRC signaling.
In the case of non-coherent pre-coding matrix
[0225] Figure 12 is a diagram illustrating an example of configuring a non-coherent pre-coding matrix according to an additional different embodiment of the present invention.
[0226] In the case of a non-coherent pre-coding matrix, each layer can be transmitted on an antenna port. In this case, in order to maintain a power restriction per antenna, a PT-RS port is unable to lend power from a different layer.
[0227] On the other hand, when two PT-RS ports are configured, a specific PT-RS port can lend power, a maximum of 3 dB of REs muted in the frequency domain (for another PT-RS port).
[0228] In this case, as shown in equation 8, a power-up factor of PT-RS in uplink or a level of power-up can satisfy ^x l ° Sio W. In this case, Y corresponds to the number of ports of PT-RS UL adjusted to the UE and can have a value of 1 or 2.
[0229] For example, as shown in Figure 12, when a pre-coding matrix corresponding to a TPMI 0 index of Table 13 is set to a UE and a PT-RS UL port is associated with a layer # 0, it can be assumed that a pre-encoder of the PT-RS port corresponds to a pre-coding matrix corresponding to a TPMI 0 index of Table 9. In this case, as mentioned in the description below, the information that indicates that the PT port -RS UL is associated with layer # 0 can be forwarded to the UE through DCI or RRC signaling. In other words, the PT-RS UL port can be associated with layer # 1 instead of layer # 0 depending on a modality and information can be forwarded to the UE through DCI or RRC signaling.
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[0230] In that case, in order to maintain a power restriction per antenna,
PUSCH to PT-RS EPRE must be 0 dB.
[0231] Next, when transform pre-coding is disabled in accordance with the present invention, all modalities capable of being applied to a method for a UE to carry out a power intensification UL PT-RS and a transmission method UL PT-RS based on the power intensification method will be explained in detail.
[0232] In the following description, it is assumed that SRS (Sounding Reference Signal) ports 0 and 2 within an indicated TPMI share a PT-RS port 0 and SRS ports 1 and 3 within a TPMI indicated share a PT-RS port 1. In particular, as described below, an SRS # 0 port group (for example, SRS ports 0 and 2) is assumed to share a PT-RS port and a SRS port group # 1 (for example, SRS ports 1 and 3) share a different PT-RS port.
2a / 2
ίϊ ’/ Ξ
SRS port group # 0
SRS port group # 1
[0233] First, when a configured pre-coding matrix corresponds to a classification 2 pre-coding matrix, a UE can determine a UL PT-RS power boost level as follows. In the following, a method for a UE to determine a UL PT-RS power boost level will be explained in detail based on 4 classification 2 pre-coding matrices described below.
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Ί 0 'Ί o ’‘1 0’ 1 1 _Λ 1 0 1 _π 1 0 0 1 0 1 _π 1 - / - / THE --B - -c = -Z = --n-2 0 0 2 0 1 2 -1 0 2V2 j -J0 00 00 - /1 -1 J [0234] For example, when a PT-RS port is assigned (adjusted) to
a UE, the UE does not perform a power boost based on a pre-coding matrix corresponding to Aou Β.
[0235] In this case, in order for the UE to perform a PT-RS power boost, the UE must lend power from a different antenna port (for example, CSI-RS port, etc.) that is not used. However, since the previous operation requires a power amplifier having a more dynamic range, it is not preferable in terms of UE implementation.
[0236] In particular, in the case of matrix B, since two layers share the same PT-RS port in UL, one can define a single PT-RS port only for matrix B.
[0237] On the other hand, in the case of matrix A, since two layers share a different UL PT-RS port, one or more PT-RS ports can be defined for matrix A. In particular, when two PT-RS ports are defined for matrix A, a UE can lend power from an RE where a different PT-RS port is transmitted. Therefore, when two PT-RS ports are defined for matrix A, the UE is able to perform a power boost on each of the two PT-RS ports.
[0238] Similar to matrix B, it may be able to define one or two PT-RS ports for matrix C. In particular, when a PT-RS port is set to matrix C, a UE is able to perform an intensification 0 dB power. When two PT-RS ports are fitted to matrix C, the UE is able to perform a 3dB power boost.
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[0239] Matrix D corresponds to a fully coherent matrix. A single PT-RS port can be defined only for matrix D. In particular, in the case of matrix D, the UE is able to perform a 3dB power boost.
[0240] When a configured precoding matrix corresponds to a classification 3 precoding matrix, a UE can determine an UL PT-RS power boost level as follows. In the following, a method for a UE to determine a UL PT-RS power boost level based on two rating 3 pre-coding matrices will be explained.
[0241] When a PT-RS port is assigned (adjusted) to matrix A, since a UE is unable to lend power from the layers assigned by the same PT-RS port due to the reason identical to the reason of matrix A or B of classification 2, the UE is unable to perform a power boost (in other words, the UE is capable of a 0 dB power boost).
[0242] Matrix B corresponds to a fully coherent matrix and may be able to define a single PT-RS port only for matrix B. In particular, in the case of matrix B, a UE is able to perform a power intensification in
4.77 dB.
[0243] Subsequently, when a configured precoding matrix corresponds to a rating 4 precoding matrix, a UE can determine an UL PT-RS power intensification level as follows. In the following, a method for a UE to determine a UL PT-RS power boost level will be explained in detail based on 1 rating 4 pre-coding matrix described below.
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Ο ο
[0244] The pre-coding matrix corresponds to a partially coherent matrix and shows a configuration that two layers are assigned (shared) to a PT-RS port. In particular, when the number of PT-RS ports corresponds to 1, the UE is able to perform a power boost of 3 dB. When the number of PT-RS ports corresponds to 2, since the UE is capable of lending power from a different PT-RS port, the UE is capable of performing a 6 dB power boost.
[0245] The aforementioned method for the UE to determine an UL PT-RS power intensification level can be determined as follows based on the number of UL PT-RS ports and the number of PUSCH layers that share the same combination of active SRS ports.
[0246] In this case, the UL PT-RS (A [dB]) power intensification level of the UE can satisfy the following equation. In this case, B of equation 10 can be determined based on an RRC parameter and the number of PUSCH layers that share the same combination of active SRS ports based on the table described below.
[EQUATION 10]
A = 10 * logw (# of UL PT-RS ports) + B
[TABLE 14]
The number of PUSCH layers that share the same combination of active SRS ports 1 2 3 4 RRC parameters 00 0 [dB] 3 [dB] 4.77 [dB] 6 [dB] 01 reserved
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The number of PUSCH layers that share the same combination of active SRS ports 1 2 3 4 10 reserved 11 reserved
[0247] In this case, considering RRC parameters ‘01’, ‘10’, and ‘11’, you may be able to define B values other than an RRC parameter ‘00’ in Table 14.
[0248] According to the present invention, when a separate RRC parameter is not set to a UE, the UE can use RRC parameters = 00 as a standard value. In other words, when a separate RRC parameter is not set to a UE, the UE can expect (or assume, or consider) that a B value to determine a UL PT-RS power boost level corresponds to 0 [dB] (when the number of PUSCH layers that share the same combination of active SRS ports corresponds to 1), 3 [dB] (when the number of PUSCH layers that share the same combination of active SRS ports corresponds to 2), 4.77 [dB] (when the number of PUSCH layers that share the same combination of active SRS ports corresponds to 3), or 6 [dB] (when the number of PUSCH layers that share the same combination of SRS ports) Active SRS correspond to 4).
[0249] In addition, in the case of a partially coherent pre-coding matrix or a non-coherent pre-coding matrix, the aforementioned UL PT-RS power intensification level of the UE can be determined as follows.
[0250] First, when the partially coherent pre-coding matrix or the non-coherent pre-coding matrix is applied, the PT-RS power boost level of the UE can be determined based on the number of UL PT- ports RS only. However, as an exceptional case, since two layers are shared by a single PT-RS port for two partially coherent pre-coding matrices described below, one can
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55/73 additionally apply 3 dB to the PT-RS power boost level of the UE.
110 01 1 0 0 1 0 0 11 1 0 0 11 2 ^ 2 1-10 0 2V2 J -. / 0 00 0 1-10 0 j -7
[0251] More specifically, among pre-coding arrays except for a fully coherent array, only two partially coherent arrays can lend power from one layer using the same combination of active SRS ports (or the same PT- LOL). In particular, although the two precoding arrays correspond to partially coherent precoding arrays, a layer # 0 and a layer # 1 of the two precoding arrays share the same SRS port. Similarly, layer # 2 and layer # 3 of the two precoding arrays share the same SRS port. Therefore, in the case of the two pre-coding matrices, power can be lent between the layers.
[0252] In particular, the UL PT-RS power level (A [dB]) of the UE satisfies the following equation. In the case of a non-coherent pre-coding matrix, B corresponds to 0. In the case of a partially coherent pre-coding matrix except for the two pre-coding matrices, B corresponds to 0. In the case of the two pre-coding, B corresponds to 3 [dB],
[EQUATION 11]
A = 10 * logw (# of UL PT-RS ports) + B
[0253] In this case, the UL PT-RS power intensification level that satisfies equation 11 may correspond to a PT-RS β scaling factor.
[0254] More specifically, when a transform pre-coding is disabled, if an upper layer parameter UL-PTRS present is set to a UE, the PT-RS β scaling factor can be
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56/73 determined as follows based on a value indicated by an RRC parameter ratio UL-PTRS-EPRE whose default value corresponds to 00.
[0255] - When a pre-coding matrix indicated by a TPMI corresponds to a pre-coding matrix corresponding to one selected from the group consisting of a TPMI index 0 in Table 10, TPMI indexes 0 to 13 of the Table 11 TPMI indices 0 to 2 of Table 12 and a TPMI index 0 in Table 13, PT-RS scaling factor β ^pr ~ * corresponds to ^FIS. In this case, k / ^{UL v} pt-rs corresponds to the actual number of UL PT-RS ports.
[0256] - When a pre-coding matrix indicated by a TPMI corresponds to a pre-coding matrix corresponding to one selected from a TPMI 1 index in Table 13 and a TPMI 2 index in Table 13, the scaling factor PT-RS β corresponds to * ^PT ~ ^RS .
[0257] - Otherwise, the scaling factor PT-RS β corresponds to 1. [TABLE 15]
The number of layers of PUSCH 1 2 3 4 RRC parameters 00 1 Go a / 3 2 01 reserved 10 reserved 11 reserved
[0258] Or, in the case of a UL transmission based on a non-coherent codebook or a UL transmission based on a partially coherent codebook, the scaling factor PT-RS β according to the base station can be determined as follows.
[0259] - When a pre-coding matrix indicated by a TPMI corresponds to a pre-coding matrix corresponding to one selected from the group consisting of a TPMI index 0 in Table 10, TPMI indexes
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57/73 to 13 of Table 11, TPMI indexes O to 2 ad Table 12, and a TPMI 0 index of Table 13, the PT-RS scaling factor β corresponds to. In this case ^ul n, ^v EN-FIS match the actual number of UL PT-RS ports.
[0260] - When a pre-coding matrix indicated by a TPMI corresponds to a pre-coding matrix corresponding to one selected from a TPMI 1 index in Table 17 and a TPMI 2 index in Table 13, the scaling factor PT-RS β corresponds to.
[0261] In this case, when the RRC configuration does not exist or is not received, η1 and η2 can be configured by default values (ie, 1 and 2), respectively. And, η1 and η2 can be reconfigured through RRC signaling.
[0262] In the aforementioned configuration, when a partially coherent codebook-based UL transmission or a non-coherent codebook-based UL transmission is performed, if the number of PT-RS ports is set to 2 (for example , when the number of UL-PT-RS ports of upper layer parameters corresponds to 2), the actual number of UL PTRS port (s) is derived from an indicated pre-coding matrix (or TPMI) and a transmission layer associated with each UL PT-RS port can be determined according to the rules described below.
[0263] 1> SRS ports # 0 and # 2 (or, DMRS ports # 0 and # 2) in an indicated pre-coding matrix (or TPMI) shares a PTRS port # 0.
[0264] 2> SRS ports # 1 and # 3 (or, DMRS ports # 1 and # 3) in an indicated pre-coding matrix (or TPMI) share a PTRS # 1 port.
[0265] 3> UL PTRS # 0 port is associated with a UL x layer among the layers transmitted through SRS ports # 0 and # 2 (or DMRS ports # 0 and # 2) in a pre-array indicated encoding (or TPMI).
[0266] 4> UL PTRS # 1 port is associated with a UL y layer among
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[0267] 5> In this case, x and y are provided to a UE through a maximum 2-bit indicator in a UL grant. In this case, the first bit of the indicator is used to indicate x and the second bit of the indicator is used to indicate y. For example, x and / or y can be provided through a DCI parameter ‘PTRS-DMRS association’ of a DCI format 0_1.
[0268] In addition, a UE according to the present invention can perform a PT-RS power boost method to perform a UL transmission not based on a codebook.
[0269] More specifically, unlike codbook-based UL transmission, in the case of carrying out non-codebook-based UL transmission, a base station can inform an UE of an SRS port configuration between the layers. In the case of carrying out UL transmission not based on a codebook, a PT-RS power boost level of a UE can be determined to be identical to the case of the aforementioned non-coherent pre-coding matrix (ie, based on the number of UL PT-RS ports only).
[0270] Additionally, in relation to the aforementioned UE capacity report of a UE, the UE according to the present invention can perform a PT-RS power boost as follows.
[0271] For example, when the UE reports not as coherent as the UE capacity, it means that the UE does not share power between the transmission antennas. In particular, when the UE reports not coherent as the capacity of the UE, although the UE is able to perform a power boost according to multiple PT-RS ports through a UL transmission not based on codebook, the UE is unable to perform a power boost
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[0272] However, in case of carrying out UL transmission not based on codebook, since a PT-RS port index is defined in each SRS resource, a UE is able to know the number of PT ports -RS defined in an SRS resource. Therefore, the UE is capable of carrying out precisely a power boost according to multiple PT-RS ports.
[0273] As a different example, when the UE reports fully coherent as the UE capacity, it means that the UE is able to share power between the transmission antennas. In this case, as mentioned in the previous description, a single PT-RS port can be adjusted to the UE and the UE can perform a power sharing on all antenna ports. In other words, having reported fully coherent as the UE capacity, the UE can perform a power sharing on all SRS resources (ports) and a resource based power boost when the UE transmits a PTRS via UL transmission not based on codebook.
[0274] As a further different example, when the UE reports partially coherent as the UE capacity, it means that the UE is able to share power between the partial transmission antennas only.
[0275] However, it is necessary for a base station to know the SRS resources connected to the antenna ports where the power sharing is performed. Therefore, the UE can report the information to the base station in the aspect of the UE capacity.
[0276] Otherwise, similar to the non-coherent case, the UE can assume that the power sharing is not performed between the antenna ports. In this case, the UE can perform a power boost only based on the number of multiple UL PT-RS ports.
[0277] Additionally, the values corresponding to the RRC parameters ‘01’,
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60/73 ‘10’, ‘11’ included in Tables 14 and 15 above are configured by additionally applying the modalities below.
[0278] Additionally, the power ratio between PUSCH and PTRS per layer per RE, for a UL transmission based on Codebook, can be defined as the equation below.
[EQUATION 12]
-A -10 * Log10 (NpT-Rs) [dB]
[0279] In this equation, A is determined by the table below, and NPT-RS denotes a number of PT-RS ports configured to the UE.
[TABLE 16]
The [dB] # of PDSCH layers in the SRS port group 1 2 3 4 5 6 RRC parameter 00 0 3 4.77 6 7 7.78 01 0 0 0 0 0 0 10 reserved 11 reserved
[0280] In this document, an SRS port group means a group of SRS ports that share an identical PT-RS port.
[0281] In the case of fully coherent, only one SRS port group can be defined. In that case, all antenna ports in the UE are able to share power with other antenna ports.
[0282] In the case of partially coherent, it may be able to define two SRS port groups. In this case, the antenna ports belonging to the same group can only share power.
[0283] In the case of non-coherent, all the antenna ports of the UE are unable to perform a power sharing.
[0284] Consequently, according to the example, the UE is able to transmit PT-RS by power intensification the greater the number of
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61/73
SRS port group # 0
SRS port group # 1 layers defined in the same SRS port group.
[0285] For example, an UE is supposed to report partially coherent to a base station. In this case, the UE and the base station can interpret a codeword (or pre-coding matrix) described below as the two SRS port groups. In this case, layers # 0 and # 1 are connected to an SRS # 0 port only, and layers # 2 and # 3 are connected to an SRS # 1 port only. Therefore, if a PT-RS # 0 port is connected to layer # 0, when the UE transmits the PT-RS through layer # 0, the UE is able to lend power from layer # 1. However, when the UE transmits PT-RS through layer # 0, the UE is unable to lend power from layers # 2 and # 3 belonging to a different SRS port group.
ίθ7-Ρ-7-λ7 “£
[0286] However, when a UE reports fully coherently, the UE can assume that all antenna ports are capable of sharing power despite the code word (or pre-coding matrix).
[0287] Based on the UE capacity in partially / totally / non-coherent and / or configured TPMI form (or code word), the UE can determine the UL PT-RS power intensification level.
[0288] Or, based on the UE capacity in partially / totally / non-coherent and / or configured TPMI form (or codeword), the UE can determine a standard value related to UL PT-RS power intensification.
[0289] For example, when a UE reports that the UE supports fully coherent, the UE is able to share power between all antenna ports. AND
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62/73 a PT-RS is defined only. In this case, UE and / or gNB assume 00 ^the row in Table 16 as standard.
[0290] For another example, when a UE reports that the UE supports partially coherent (totally coherent does not support), the UE is able to share power between SRS ports belonging to the same SRS port group only. And, a maximum of two PT-RSs can be defined. In this case, UE and / or gNB assume 00th row in Table 16 as standard.
[0291] For another example, when a UE reports that the UE supports non-coherent (totally coherent does not support), it is assumed that a power share is unavailable between the antenna ports and the 0V row is assumed as standard.
[0292] Additionally, a UE determines a default value as below.
[0293] <1> Alt 1
[0294] In this document, it is assumed that a power ratio between PUSCH and PTRS per layer per RE is determined based on the equation and the table below.
[EQUATION 13]
Power ratio between PUSCH and PTRS per layer per RE = - A
[TABLE 17]
The [dB] # of PUSCH layers 1 2 3 4 RRC parameter 00 0 3 4.77 6 01 0 0 0 0 10 reserved 11 reserved
[0295] A fully consistent reporting UE uses 00 as a default value.
[0296] A UE that reports partially coherent / non-coherent uses 01 as a default value. (that is, the power intensification between the layers and the
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63/73 power boost according to the number of PT-RS ports are not supported.)
[0297] <2> Alt 2
[0298] In this document, it is assumed that a power ratio between PUSCH and PTRS per layer per RE is determined based on the equation and the table below.
[EQUATION 14]
Power ratio between PUSCH and PTRS per layer per RE = - A
[TABLE 18]
The [dB] # of PUSCH layers 1 2 3 4 RRC parameter 00 0 3 4.77 6 01 0 3 3 3 10 0 0 0 0 11 reserved
[0299] A fully consistent reporting UE uses 00 as a default value.
[0300] A partially reporting UE uses 01 as a default value.
[0301] In the present document, in the case of partially coherent, when two layers belong to the same SRS door group, it is possible to carry out an intensification of 3 dB through power lending between the layers. And although two layers belong to a different SRS port group, if two PT-RS ports are defined, the UE is able to perform a 3 dB boost.
[0302] An UE that reports non-coherently uses 10 as a default value.
[0303] In the present document, in the case of non-coherent, when two layers belong to a different SRS port group, it is possible to carry out an intensification of 3 dB. However, although two layers belong to the
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64/73 same SRS door group, it is impossible to make a power loan between the layers. Therefore, the UE uses 10 as a default value. In this case, it can be configured being able to perform a power boost only when the number of UL PT-RS ports corresponds to 2.
Conclusion
[0304] Figure 13 is a diagram that briefly illustrates an operation of transmitting and receiving a UL PT-RS between a UE and a base station applicable to the present invention, and Figure 14 is a flow chart illustrating a method of transmission of a UL PT-RS of a UE applicable to the present invention.
[0305] A UE receives from a base station, first information regarding the power intensification for transmission from PT-RS and second information regarding a pre-coding matrix for transmission of a Shared Channel on Physical Uplink (PUSCH) ) [S1310, S1410].
[0306] The UE determines a level of power intensification based on the first information and the second information [S1320, S1420]. In this document, the level of power intensification is related to a ratio between PUSCH power and PT-RS power per layer and per resource element (RE).
[0307] In particular, a determination of the level of power intensification based on the first information and the second information by the UE understands that based on the pre-coding matrix indicated by the second information being a partially coherent pre-coding matrix or a non-coherent pre-coding matrix, the EU determines the level of power intensification based on a number of PT-RS ports.
[0308] The UE transmits PT-RS using the power intensification level determined to the base station [S1330, S1430].
[0309] In the present document, the first information may indicate a
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65/73 plurality of power intensification levels. In this case, a determination of the level of power intensification based on the first information and the second information by the UE can understand that the UE determines based on the second information, one among the plurality of levels of power intensification.
[0310] In particular, the determination of the level of power intensification based on the first information and the second information by the UE may understand that based on the second information indicating a partially coherent pre-coding matrix the UE determines the level of intensification of power as a first level of power intensification among the plurality of levels of power intensification indicated by the first information, or based on the second information indicating a non-coherent pre-coding matrix the UE determines the level of power intensification as a second power intensification level different from the first power intensification level, among the plurality of power intensification levels indicated by the first information.
[0311] In the present invention, the determination of the power intensification level based on the number of PT-RS ports by the UE can understand that based on the second information indicating a partially coherent pre-coding matrix, and the number of ports of PT-RS being equal to 1, the UE determines the level of power intensification as being 0 dB in a state in which a number of layers of PUSCH is equal to 2 or 3, or the UE determines the level of power intensification as being 3 dB in a state where a number of layers of PUSCH is equal to 4.
[0312] In the present invention, the determination of the power intensification level based on the number of PT-RS ports by the UE can understand that based on the second information indicating a pre-coding matrix
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66/73 partially coherent, and the number of PT-RS ports being equal to 2, the UE determines the power intensification level as being 3 dB in a state in which a number of layers of PUSCH is equal to 2 or 3 , or the UE determines the power boost level to be 6 dB in a state where a number of layers of PUSCH is equal to 4.
[0313] In the present invention, the determination of the power intensification level based on the number of PT-RS ports by the UE can understand that based on the second information indicating a non-coherent pre-coding matrix, and the number of ports of PT-RS being equal to 1, the UE determines the power intensification level as being 0 dB.
[0314] In the present invention, the determination of the power intensification level based on the number of PT-RS ports by the UE can understand that based on the second information indicating a non-coherent pre-coding matrix, and the number of ports of PT-RS being equal to 2, the UE determines the power intensification level as being 3 dB.
[0315] In the present invention, the second information can refer to a transmission classification indicator (TRI) and a transmission precoding matrix indicator (TPMI) for the precoding matrix for PUSCH transmission.
[0316] In particular, the second information may indicate whether the pre-coding matrix for PUSCH transmission is the partially coherent pre-coding matrix or the non-coherent pre-coding matrix.
[0317] Additionally, the UE may determine that the transmission of the PUSCH is not based on a codebook, and is based on the transmission of the PUSCH not being based on a codebook, the UE may determine the level of power intensification based on the number of PT-RS ports:
[0318] - based on the number of PT-RS ports being equal to 1,
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67/73 determining the power intensification level as being 0 dB
[0319] - based on the number of PT-RS ports being equal to 2, determining the power intensification level as being 3 dB.
[0320] Since each modality of the proposed method described above can be considered as a method for implementing the present invention, it is apparent that each modality can be considered as a proposed method. Furthermore, the present invention can be implemented not only using the proposed methods independently, but also by combining (or joining together) some proposed methods. In addition, it is possible to define a rule that information about whether the proposed methods are applied (or information about rules related to the proposed methods) must be transmitted from the eNB to the UE via a predefined signal (for example, physical layer signal, top layer signal, etc.).
3. Device configuration
[0321] Figure 15 is a diagram illustrating configurations of a UE and a base station capable of being implemented by the modalities proposed in the present invention. The UE and the base station shown in Figure 15 operate to implement the modalities for a method of transmitting and receiving a phase tracking reference signal between the base station and the UE.
[0322] A UE 1 can act as a transmitting end in a UL and as a receiving end in a DL. A base station (eNB or gNB) 100 can act as a receiving end on a UL and as a transmitting end on a DL.
[0323] That is, each of the UE and base station can include a Transmitter (Tx) 10 or 110 and a Receiver (Rx) 20 or 120, to control the transmission and reception of information, data and / or messages, and an antenna 30 or 130 to transmit and receive information, data and / or messages. In this document,
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68/73 a radio frequency (RF) module means a component including the Transmitter and Receiver, etc.
[0324] Each of the UE and base station includes a 40 or 140 processor to carry out the aforementioned embodiments of the present invention. Processor 40 or 140 can be configured to implement the aforementioned explanation / proposed procedure and / or methods by controlling a memory 50 or 150, a transmitter 10 or 110, and / or a receiver 20 or 120.
[0325] For example, processor 40 or 140 includes a communication modem designed to implement wireless communication technology (for example, LTE, NR). The 50 or 150 memory is connected to the 40 or 140 processor and stores various information related to a 40 or 140 processor operation. For example, the 50 or 150 memory can perform all or part of the processes controlled by the 40 or 140 processor or store a software code including commands to perform the proposed / explanation procedure and / or methods. Transmitter 10 or 110 and / or receiver 20 or 120 are connected to processor 40 or 140 and transmit and / or receive a radio signal. In this case, processor 40 or 140 and memory 50 or 150 can correspond to a part of a processing chip (for example, System on a Chip (SoC)).
[0326] In particular, a user equipment according to the present invention comprises a radio frequency (RF) module; at least one processor; and at least one computer memory operably connectable to at least one processor and stores instructions that, when executed, induce at least one processor to perform the operations below.
[0327] In this case, operations mentioned above comprise that the at least one processor, receives through the RF module and from a base station, first information regarding the power intensification for PT-RS transmission and second information regarding a pre array
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69/73 encoding for transmission of a Shared Channel on Physical Uplink (PUSCH), determines a level of power intensification based on the first information and the second information, in which the level of power intensification is related to a ratio between power of PUSCH and PT-RS power per layer and per resource element (RE), and transmits the PT-RS through the RF module and the base station using the determined power intensification level. In this document, a determination of the power intensification level based on the first information and the second information comprises, based on the pre-coding matrix indicated by the second information, being a partially coherent pre-coding matrix or a pre-coding matrix. non-coherent coding, determine the power intensification level based on a number of PT-RS ports.
[0328] In this document, the first information may indicate a plurality of levels of power intensification. In this case, a determination of the power intensification level based on the first information and the second information by at least one processor can understand that the at least one processor determines based on the second information, one among the plurality of power intensification levels. .
[0329] In particular, determining the power intensification level based on the first information and the second information by at least one processor can understand that based on the second information indicating a partially coherent pre-coding matrix, at least one processor determines the power boost level as a first power boost level among the plurality of power boost levels indicated by the first information, or based on the second information indicating a non-coherent pre-coding matrix the at least one processor determines the power intensification level as a second level
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70/73 power intensification different from the first power intensification level, among the plurality of power intensification levels indicated by the first information.
[0330] In the present invention, determining the power intensification level based on the number of PT-RS ports by at least one processor can understand that based on the second information indicating a partially coherent pre-coding matrix, and the number of PT-RS ports being equal to 1, the at least one processor determines the power boost level as being 0 dB in a state in which a number of layers of PUSCH is equal to 2 or 3, or at least one processor determines the power boost level to be 3 dB in a state where a number of layers of PUSCH is equal to 4.
[0331] In the present invention, determining the power intensification level based on the number of PT-RS ports by at least one processor can understand that based on the second information indicating a partially coherent pre-coding matrix, and the number of PT-RS ports being equal to 2, the at least one processor determines the power boost level as being 3 dB in a state in which a number of layers of PUSCH is equal to 2 or 3, or at least one processor determines the power boost level to be 6 dB in a state where a number of layers of PUSCH is equal to 4.
[0332] In the present invention, determining the power intensification level based on the number of PT-RS ports by at least one processor can understand that based on the second information indicating a non-coherent pre-coding matrix, and the number of PT-RS ports being equal to 1, the at least one processor determines the power intensification level as being 0 dB.
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71/73
[0333] In the present invention, determining the power intensification level based on the number of PT-RS ports by at least one processor can understand that based on the second information indicating a non-coherent pre-coding matrix, and the number of PT-RS ports being equal to 2, the at least one processor determines the power intensification level as being 3 dB.
[0334] In the present invention, the second information can relate to a transmission classification indicator (TRI) and a transmission precoding matrix indicator (TPMI) for the precoding matrix for PUSCH transmission.
[0335] In particular, the second information may indicate whether the pre-coding matrix for PUSCH transmission is the partially coherent pre-coding matrix or the non-coherent pre-coding matrix.
[0336] Additionally, at least one processor can determine that PUSCH transmission is not based on codebook, and is based on PUSCH transmission not being based on codebook, at least one processor can determine the level of power intensification based on the number of PT-RS ports:
[0337] - based on the number of PT-RS ports being equal to 1, determining the power intensification level as being 0 dB
[0338] - based on the number of PT-RS ports being equal to 2, determining the power intensification level as being 3 dB.
[0339] The UE and base station Tx and Rx can perform a packet modulation / demodulation function for data transmission, a high speed packet channel encoding function, OFDM packet scheduling, scheduling of TDD and / or plumbing package. Each of the UE and the base station in Figure 15 can also include a radio frequency module
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72/73 (RF) / intermediate frequency (IF) of low power.
[0340] However, the UE can be any of a Personal Digital Assistant (PDA), a cell phone, a Personal Communication Service (PCS) phone, a Global System for Mobile Communications (GSM) phone, an Access phone Multiple by Broadband Code Division (WCDMA), a Mobile Broadband System (MBS) phone, a handheld PC, a laptop PC, a smartphone, a Multiple Mode and Multiple Band terminal (MM-MB), etc.
[0341] The smartphone is a terminal that takes advantage of a mobile phone and a PDA. It incorporates the functions of a PDA, that is, scheduling and data communications, such as facsimile transmission and reception and Internet connection on a mobile phone. The MB-MM terminal refers to a terminal that has a built-in multi-modem chip and that can operate on any mobile Internet system and other mobile communication systems (for example CDMA 2000, WCDMA, etc.).
[0342] The modalities of the present disclosure can be achieved by various means, for example, hardware, firmware, software, or a combination thereof.
[0343] In a hardware configuration, methods according to exemplary modalities of the present disclosure can be achieved by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices ( DSPDs), Programmable Logic Devices (PLDs), Field Programmable Port Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.
[0344] In a firmware or software configuration, the methods according to the modalities of the present disclosure can be implemented in the form of a module, a procedure, a function, etc. performing the functions or
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73/73 operations described previously. A software code can be stored in memory 50 or 150 and executed by processor 40 or 140. The memory is located inside or outside the processor and can transmit and receive data from the processor through various known means.
[0345] Individuals skilled in the art will appreciate that the present disclosure can be carried out in other specific ways in addition to those presented in this document without diverging the scope and fundamental characteristics of the present disclosure. The previous modalities must, therefore, be constructed in all aspects as illustrative and not restrictive. The scope of the disclosure must be determined by the attached claims and their legal equivalents, not by the previous description, and all changes arising from the range of meaning and equivalence of the attached claims are intended to be covered in this document. It is obvious to those skilled in the art that claims that are not explicitly cited in the appended claims may be presented in combination as a form of the present disclosure or included as a new claim for a subsequent amendment after the application is filed.
INDUSTRIAL APPLICABILITY
[0346] The present disclosure is applicable to several wireless access systems including a 3GPP system, and / or a 3GPP2 system. In addition to these wireless access systems, the modalities of the present disclosure are applicable to all technical fields where wireless access systems find their applications. In addition, the proposed method can also be applied to mmWave communication using an ultra-high frequency band.

权利要求:
Claims (14)
[1]
1. Method of transmitting a phase-tracking reference signal (PT-RS) by user equipment (UE) in a wireless communication system, FEATURED by the fact that it comprises:
receive, from a base station, (i) first information regarding the power intensification for transmission from PT-RS and (ii) second information regarding a pre-coding matrix for transmission of a Shared Channel on Physical Uplink (PUSCH);
determine a level of power intensification based on the first information and the second information, where the level of power intensification is related to a ratio between PUSCH power and PT-RS power per layer and per resource element (RE) ; and transmit, to the base station, the PT-RS using the determined power intensification level, where determining the power intensification level based on the first information and the second information comprises:
Based on the pre-coding matrix indicated by the second information, being a partially coherent pre-coding matrix or a non-coherent pre-coding matrix, determine the power intensification level based on a number of PT-RS ports.
[2]
2. Method, according to claim 1, CHARACTERIZED by the fact that the first information indicates a plurality of power intensification levels, and in which determining the level of power intensification based on the first information and the second information comprises determining , based on the second information, one among a plurality of power intensification levels.
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2/7
[3]
3. Method, according to claim 2, CHARACTERIZED by the fact that determining the level of power intensification based on the first information and the second information comprises:
based on the second information indicating the partially coherent pre-coding matrix, determine the power boost level as a first power boost level from the plurality of power boost levels indicated by the first information; and based on the second information indicating the non-coherent pre-coding matrix, determine the power boost level as a second power boost level different from the first power boost level, among the plurality of power boost levels indicated by the first information.
[4]
4. Method, according to claim 1, CHARACTERIZED by the fact that determining the level of power intensification based on the number of PT-RS ports comprises:
based on (i) the second information indicating the partially consistent pre-coding matrix, and (ii) the number of PT-RS ports being equal to 1:
determining the power intensification level as being 0 dB in a state in which a number of layers of PUSCH is equal to 2 or 3; and determining the power boost level to be 3 dB in a state where a number of layers of PUSCH is equal to 4.
[5]
5. Method, according to claim 1, CHARACTERIZED by the fact that determining the level of power intensification based on the number of PT-RS ports comprises:
based on (i) the second information indicating the partially consistent pre-coding matrix, and (ii) the number of PT-RS ports being equal
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3/7 to 2:
determining the power intensification level as being 3 dB in a state in which a number of layers of PUSCH is equal to 2 or 3; and determining the power boost level to be 6 dB in a state where a number of layers of PUSCH is equal to 4.
[6]
6. Method, according to claim 1, CHARACTERIZED by the fact that determining the power intensification level based on the number of PT-RS ports comprises:
based on (i) the second information indicating the non-coherent pre-coding matrix, and (ii) the number of PT-RS ports being equal to 1:
determine the power boost level as being 0 dB.
[7]
7. Method, according to claim 1, CHARACTERIZED by the fact that determining the level of power intensification based on the number of PT-RS ports comprises:
based on (i) the second information indicating the non-coherent pre-coding matrix, and (ii) the number of PT-RS ports being equal to 2:
determine the power boost level to be 3 dB.
[8]
8. Method, according to claim 1, CHARACTERIZED by the fact that the second information refers to a transmission classification indicator (TRI) and a transmission pre-coding matrix indicator (TPMI) for the pre-matrix -coding for PUSCH transmission.
[9]
9. Method, according to claim 8, CHARACTERIZED by the fact that the second information indicates whether the pre-coding matrix for PUSCH transmission is the partially coherent pre-coding matrix or the non-coherent pre-coding matrix .
[10]
10. Method, according to claim 1, CHARACTERIZED by the fact that it also comprises:
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4/7 determine that PUSCH transmission is not based on a codebook; and based on the PUSCH transmission being non-codebook based, determine the power intensification level based on the number of PT-RS ports by:
based on the number of PT-RS ports being equal to 1, determine the power intensification level as being 0 dB; and based on the number of PT-RS ports being equal to 2, determine the power intensification level as being 3 dB.
[11]
11. User equipment (UE) configured to transmit a phase tracking reference signal (PT-RS) in a wireless communication system, FEATURED by the fact that it comprises:
a radio frequency (RF) module;
at least one processor; and at least one computer memory operably connectable to at least one processor and storing instructions that, when executed, induce at least one processor to perform operations that comprise:
receive, through the RF module and from a base station, (i) first information regarding the power intensification for transmission from PT-RS and (ii) second information regarding a pre-coding matrix for transmission of a Shared Channel on Physical Uplink (PUSCH);
determine a level of power intensification based on the first information and the second information, where the level of power intensification is related to a ratio between PUSCH power and PT-RS power per layer and per resource element (RE) ; and transmit, through the RF module and the base station, the PT-RS using the determined power intensification level, in which to determine the power intensification level based on the
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5/7 first information and second information comprises:
Based on the pre-coding matrix indicated by the second information, being a partially coherent pre-coding matrix or a non-coherent pre-coding matrix, determine the power intensification level based on a number of PT-RS ports.
[12]
12. User equipment (UE), according to claim 11, CHARACTERIZED by the fact that the first information indicates a plurality of power intensification levels, and in which to determine the level of power intensification based on the first information and in the second information it comprises determining, based on the second information, one among the plurality of levels of power intensification.
[13]
13. User equipment (UE), according to claim 12, CHARACTERIZED by the fact that determining the level of power intensification based on the first information and the second information comprises:
based on the second information indicating the partially coherent pre-coding matrix, determine the power boost level as a first power boost level from the plurality of power boost levels indicated by the first information; and based on the second information indicating the non-coherent pre-coding matrix, determine the power boost level as a second power boost level different from the first power boost level, among the plurality of power boost levels indicated by the first information.
[14]
14. User equipment (UE), according to claim 11, CHARACTERIZED by the fact that determining the power intensification level based on the number of PT-RS ports comprises:

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公开号 | 公开日

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KR20190067731A|2019-06-17|

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MX2019002598A|2019-07-10|

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US10355842B2|2019-07-16|

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US10999031B2|2021-05-04|

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US10594458B2|2020-03-17|

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AU2018298510A1|2019-06-27|

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AU2018298510B2|2020-04-16|

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CL2019000066A1|2019-11-08|

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CN110771086A|2020-02-07|

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EP3520312A4|2019-09-18|

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KR102037326B1|2019-10-28|

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US20190182001A1|2019-06-13|

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EP3520312B1|2022-02-02|

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US20190238293A1|2019-08-01|

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EP3520312A1|2019-08-07|

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BR112019007429A2|2019-10-15|

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JP2020509617A|2020-03-26|

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法律状态:
2020-03-31| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-03-31| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 5/00 , H04W 52/32 , H04W 72/04 , H04B 7/0456 Ipc: H04L 5/00 (2006.01), H04W 52/32 (2009.01), H04W 52 |

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2020-06-02| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/12/2018, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US201762596111P| true| 2017-12-07|2017-12-07|

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US62/596.111|2017-12-07|

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US201862615932P| true| 2018-01-10|2018-01-10|

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US201862616459P| true| 2018-01-12|2018-01-12|

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US62/616.459|2018-01-12|

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PCT/KR2018/015535|WO2019112374A1|2017-12-07|2018-12-07|Method of transmitting uplink phase tracking reference signal by user euqipment in wireless communication system and apparatus supporting same|

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