methods for transmitting and receiving a configuration message for a phase tracking reference signal

专利摘要:
A technique for transmitting and receiving a configuration message for a phase tracking reference signal, PT-RS, on a radio channel between a radio access node and a radio device is described. The radio channel comprises a plurality of subcarriers in a physical resource block, PRB (602). A subset of the subcarriers (608) in the PRB (602) is allocated to a demodulation reference signal, DM-RS. As for an aspect of the technique method, the configuration message is transmitted to the radio device. The configuration message comprises a bit field that is indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS.
公开号:BR112020009649A2
申请号:R112020009649-0
申请日:2018-11-15
公开日:2020-11-10
发明作者:Vicent Molés Cases；Mattias Frenne
申请人:Telefonaktiebolaget Lm Ericsson (Publ)；
IPC主号:

专利说明:

[001] [001] The present description generally refers to a technique for configuring a Phase Tracking Reference Signal (PT-RS). More specifically, methods and devices are provided for transmitting and receiving a configuration message to a PT-RS, as well as a radio signal structure representative of that configuration message. Foundations
[002] [002] The physical structure of the signal for the next generation of radio access technology is specified by the Third Generation Partnership Project (3GPP) as Novo Rádio (NR). The NR has a lean design that minimizes the always-on transmissions to improve the energy efficiency of the network and ensure future compatibility. In contrast to the existing Long Term Evolution of 3GPP (LTE), the reference signals in NR are transmitted only when necessary. Four main reference signals include a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), an audible reference signal (SRS) and a system status reference signal. channel (CSI-RS).
[003] [003] PT-RS is introduced in the NR to allow the compensation of the oscillator phase noise. Normally, phase noise increases depending on the carrier frequency of the oscillator. Therefore, PT-RS can be used at high carrier frequencies, such as mm waves, to mitigate phase noise. One of the main degradations caused by phase noise in an OFDM signal (Orthogonal Frequency Division Multiplexing) is a rotation
[004] [004] The exact sub-carrier of PT-RS can be implicitly defined, for example, according to one or more of the following parameters: DM-RS port index, DM-RS scrambling ID (SCID) and cell ID. In addition, an explicit signaling (for example, radio resource control, RRC) of a conventional “PTRS-RE-offset” parameter could replace the aforementioned implicit association rule, which is important, for example, in order to force a collision of the PT-RS with a direct current (DC) subcarrier for which performance is poor. Therefore, a simple or existing solution would signal an explicit “PTRS-RE-offset” offset or position, which takes any value from 0 to 11. In other words, PT-RS can be mapped to any subcarrier in the PRB using this explicit signaling existing.
[005] [005] In the existing signaling, the signaled parameter “PTRS-RE-offset” can be defined as any value from 0 to 11. It is then a problem that the “PTRS-RE-offset” signaled using RRC signaling implies a restriction of gNB programming, as the DM-RS used for PDSCH or PUSCH transmission must use the subcarrier indicated by “PTRS-RE-offset”, which is undesirable.
[006] [006] For example, if “PTRS-RE-offset = 0”, if the DM-RS type 1 configuration is configured, the comb of the DM-RS subcarrier, that is, the subset {1,3,5,7, 9,11} of subcarriers allocated to DM-RS, cannot
[007] [007] Another problem is the high overhead in the existing signaling. If "PTRS-RE-offset" can be set to a value from 0 to 11, 4 bits are required per indication of "PTRS-RE-offset". In addition, as the PT-RS downlink (DL) and uplink (UL) ports can be associated with different DM-RS ports, an independent “PTRS-RE-offset” indication for UL and DL is required, thus increasing overload. Likewise, the existing signaling must independently indicate the “PTRS-RE-offset” parameter for each PT-RS port on the SU-MIMO, further increasing the signaling overhead. summary
[008] [008] Therefore, it is necessary a technique that allows to configure a PT-RS in a more efficient and / or more flexible way. More specifically, a technique is needed to reduce the signaling overhead caused by the configuration. Alternatively or in addition, a technique is needed that avoids scheduling restrictions.
[009] [009] As for one aspect, a method of transmitting a configuration message to a phase tracking reference signal (PT-RS) on a radio channel between a radio access node and a radio device is provided . The radio channel comprises a plurality of subcarriers in a physical resource block (PRB). A subset of the subcarriers in the PRB is allocated for a demodulation reference signal (DM-RS). The method comprises or triggers a step of transmitting the configuration message to the radio device. The configuration message comprises a bit field that is indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS.
[0010] [0010] The sub-carrier allocated to PT-RS can also be mentioned as PT-RS sub-carrier of PT-RS. The subcarriers allocated to DM-RS can also be called DM-RS subcarriers. The subset of subcarriers allocated to the DM-RS (that is, the subset comprising the DM-RS subcarriers) can also be referred to as the DM-RS subset. The DM-RS subset can be an appropriate subset of the plurality of subcarriers in the PRB. In other words, the subset may include fewer subcarriers than a PRB.
[0011] [0011] Through the bit field, the configuration message can signal a relative shift, for example, in relation to the relevant subset of subcarriers allocated to the DM-RS. The parameter or function represented by the bit field can be mentioned as subcarrier offset or resource element offset (RE offset) for PT-RS or briefly: “PTRS-RE-offset”. The method can be implemented as an RE shift signal for PT-RS.
[0012] [0012] The actual subcarrier used for PT-RS may depend on the “PTRS-RE-offset” parameter and the subset of subcarriers allocated to the DM-RS. For example, if a DM-RS port is identified by a DM-RS port number, the actual subcarrier used for PT-RS may depend on the “PTRS-RE-offset” parameter and the DM-RS port number.
[0013] [0013] In addition, a plurality of different DM-RSs can be transmitted on the corresponding DM-RS ports. The DM-RS port number p can be among a set of DM-RS ports used for the radio channel, for example, to perform a channel estimate of the radio channel and / or demodulate the radio channel as a radio channel. data on the receiving side of the radio channel.
[0014] [0014] To avoid scheduling restrictions and reduce signaling overhead, the value of the bit field, that is, the “PTRS-RE-offset” parameter, represents a relative index of subcarriers in the subset of
[0015] [0015] When transmitting the parameter “PTRS-RE-offset” as the configuration parameter in the bit field of the configuration message, scheduling restrictions can be avoided at least in some modalities, because the group of possible PT-RS subcarriers is restricted to the subset of subcarriers used, allocated or programmed for the DM-RS port associated with the PT-RS port.
[0016] [0016] The same modalities (for example, the modalities in the aforementioned paragraph) or other modalities may require significantly less signaling overhead than the existing displacement signaling, because a common “PTRS-RE-offset” indication can be used to DL and UL. Alternatively or in addition, a common indication can be used for different PT-RS ports on SU-MIMO.
[0017] [0017] The bit field may comprise n bits that are indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS. A number of the plurality of subcarriers in the PRB can be greater than 2n.
[0018] [0018] The subset of subcarriers allocated to the DM-RS can be dynamically signaled.
[0019] [0019] The bit field can comprise 2 or 3 bits that are indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS. The number of the plurality of subcarriers in the PRB can be 12.
[0020] [0020] The bit field can be sized to represent any of the subcarriers in the subset of subcarriers allocated to DM-RS as the subcarrier allocated to PT-RS.
[0021] [0021] The bit field can comprise n bits. A number of subcarriers in the subset of subcarriers allocated to the DM-RS can be equal to or less than 2n.
[0022] [0022] Each subcarrier in the subset of subcarriers allocated to the DM-RS can be identified exclusively by an index. The bit field can be indicative of the index corresponding to the subcarrier allocated to PT-RS.
[0023] [0023] The radio channel can be accessed through one or more DM-RS ports. Each DM-RS transmission can be associated with one or more DM-RS ports.
[0024] [0024] Each of the one or more DM-RS ports can be uniquely identified by a DM-RS port index. Each DM-RS transmission (briefly: DM-RS transmission) can be defined with or associated with a DM-RS port index.
[0025] [0025] One or more DM-RS ports may be located on (or may define) a transmitting side of the radio channel. One or more DM-RS ports can be used (for example, located) on the radio access node for a downlink transmission. Alternatively or in addition, one or more DM-RS ports may be used (for example, located at) by the radio device for an uplink link transmission.
[0026] [0026] Alternatively or in addition, one or more DM-RS ports may be located on (or may define) a receiving side of the radio channel. For example, the transmitting side can initially define the DM-RS ports by transmitting a DM-RS, and the receiving side can define combined weights for beamforming reception based on the received DM-RS. One or more DM-RS ports can be used (for example, located at) on the radio access node for uplink connection reception. Alternatively or in addition, one or more DM-RS ports can be used by (for example, located on) the radio device for a downlink transmission.
[0027] [0027] Transmission through the radio channel can comprise
[0028] [0028] The multiple transmitted layers can be separated in the spatial and / or polarization domain by a transmission pre-decoder and separated in the receiver, performing a channel estimate and, optionally, suppressing interfering layers for the radio channel based DM-RS and / or PT-RS received on the receiving side. For example, the transmission may be a multi-layer single-user MIMO transmission (SU-MIMO), in which two or more layers can be accessed through two or more DM-RS ports.
[0029] [0029] The DM-RS can be used for at least one of the pre-coding on the transmitting side and demodulation of the radio channel on the receiving side.
[0030] [0030] The subset of subcarriers allocated to the DM-RS may depend on the corresponding DM-RS port. For each of the DM-RS ports, a subset of subcarriers in the PRB can be allocated to the DM-RS transmitted (or to be transmitted) via the corresponding DM-RS port. That is, a subset of subcarriers allocated to the DM-RS is associated with each DM-RS port. At least some of the subsets of subcarriers used to transmit DM-RSs through different DM-RS ports may be different. For example, the different subsets can be mutually separated.
[0031] [0031] The PRB can comprise 12 subcarriers provided by one
[0032] [0032] For a DM-RS type 1 configuration, the parameters can be R = 2 S = 2 and Δ (p) ∈ {0, 1}. For a DM-RS type 2 configuration, the parameters can be R = 3 S = 1 and Δ (p) ∈ {0, 2, 4}. In the expression above for
[0033] [0033] The DM-RS can be derived from a sequence r (2 ∙ m + k '+ n0), start start where n0 = N BWP, i N scRB / R, N BWP, i is the beginning of the part of the bandwidth
[0034] [0034] A different DM-RS can be transmitted through each of the DM-RS's ports. As different DM-RSs (eg orthogonal signals) are transmitted on different DM-RS ports, any dependency on the “DM-RS” can be expressed equally as a dependency on the corresponding “DM-RS port”.
[0035] [0035] DM-RSs transmitted through different DM-RS ports can be differentiated by at least one orthogonal coverage code in the frequency domain, an orthogonal coverage code in the time domain and the subset of subcarriers allocated to the DM-RS .
[0036] [0036] For example, each of the DM-RSs transmitted through different DM-RS ports can use separate subsets of subcarriers or be orthogonally encoded in the frequency domain.
[0037] [0037] One of the DM-RS ports can be associated with PT-RS. PT-RS can be transmitted via the DM-RS port associated with PT-RS. PT-RS can be transmitted on the subcarrier which is allocated to PT-RS according to
[0038] [0038] PT-RS and DM-RS can be transmitted simultaneously or separately (for example, in different OFDM symbols or different PRBs, that is, different slots or transmission time intervals, TTIs). In addition, the transmission of PT-RS and transmission of DM-RS can overlap. A PT-RS transmission duration can be longer (for example, several times longer) than a DM-RS transmission duration. For example, PT-RS can be transmitted during a PRB comprising 14 OFDM symbols. The DM-RS can be transmitted during one or two OFDM symbols.
[0039] [0039] The subcarrier allocated to the PT-RS can be derived or derivable from the bit field for at least one of the forward link transmission of the PT-RS and a forward link transmission of the PT-RS.
[0040] [0040] The radio access node can be configured to access the radio channel through the DM-RS ports for a downlink transmission to the radio device. The method can also comprise or trigger a transmission step of the PT-RS through at least one of the DM-RS ports on the subcarrier allocated to the PT-RS according to the bit field between the subset of subcarriers allocated to the DM-RS for the corresponding DM-RS port.
[0041] [0041] Alternatively or in addition, the radio device can be configured to access the radio channel through the DM-RS ports for an uplink transmission to the radio access node. The method can also comprise or trigger a step of receiving the PT-RS transmitted by at least one of the DM-RS ports on the subcarrier allocated to the PT-RS according to the bit field between the subset of subcarriers allocated to the DM-RS for the corresponding DM-RS port.
[0042] [0042] A DM-RS port through which PT-RS is transmitted can also be referred to as PT-RS port. The expression “PT-RS” can collectively refer to the different PT-RSs transmitted on different DM-RS ports (PT-RS specific to the port). Alternatively or in addition, the expression “PT-RS” can refer to the port-specific PT-RS, for example, in the context of a certain PT-RS port.
[0043] [0043] The radio access node can provide access to at least one radio device on the radio channel. For each radio device, PT-RS can be transmitted via one or two DM-RS ports.
[0044] [0044] The radio channel may comprise a SU-MIMO channel (Multiple Input and Multiple Output Channel) which is accessed via two or more DM-RS ports. PT-RS can be transmitted or received on each of the at least two of the two or more DM-RS ports. The radio channel can comprise two or more layers and / or two or more DM-RS ports. PT-RS can be transmitted or received for each of the two or more layers or through each of the two or more DM-RS ports.
[0045] [0045] The radio channel can comprise a multi-user channel with multiple inputs and multiple outputs (MU-MIMO). DM-RS groups other than DM-RS ports can provide access to different radio devices. PT-RS can be transmitted or received through at least one DM-RS port in each DM-RS group.
[0046] [0046] The MU-MIMO channel can comprise, for each of the multiple radio devices, at least one layer or at least one DM-RS port. For each of the multiple radio devices, PT-RS can be transmitted or received in at least one layer or through at least one DM-RS port.
[0047] [0047] The subcarrier allocated to PT-RS can be determined exclusively among the subset of subcarriers allocated to DM-RS based on a combination of the bit field in the configuration message
[0048] [0048] The same bit field value can be indicative of different subcarriers allocated to PT-RS transmitted or received through different DM-RS ports.
[0049] [0049] The bit field can be indicative of two candidate subcarriers for PT-RS among the subset of subcarriers allocated to DM-RS. The subcarrier allocated to PT-RS can be determined between the two candidate subcarriers based on the DM-RS port through which the PT-RS is transmitted or received.
[0050] [0050] The subcarrier allocated to PT-RS transmitted or received by the DM-RS p port can be given by 2 ∙ R ∙ m + S ∙ k ’+ Δ (p). The bit field can be indicative of m. The value for k 'can be determined by the DM-RS p port as being p mod 2.
[0051] [0051] PT-RS can be transmitted or received through each of the at least two different DM-RS ports. Alternatively or in combination, PT-RS can be transmitted or received on each of an uplink link transmission and a downlink link transmission.
[0052] [0052] The DM-RS transmitted through the DM-RS p-port may be subject to an orthogonal coverage code, OCC, in the time domain, TD-OCC. Alternatively or in addition, the DM-RS transmitted via the DM-RS p-port can be subjected to an OCC in the frequency domain, FD-OCC. The subcarrier allocated to the PT-RS can be determined between the subset of subcarriers allocated to the DM-RS based on a combination of the bit fields, a DM-RS port dependency on the TD-OCC and a DM-RS port dependency on the FD-OCC. The combination can include the sum.
[0053] [0053] For example, the dependency on the DM-RS port of the TD-OCC can comprise TD_offsetp = (p-1000 div 2) div R or
[0054] [0054] for the DM-RS p port. Alternatively or in combination, the dependency on the DM-RS port of the FD-OCC can comprise FD_offsetp = p mod 2 for the DM-RS p port.
[0055] [0055] In this document, R can be equal to 2 for configuration type 1 of DM-RS or equal to 3 for configuration type 2 of DM-RS.
[0056] [0056] The TD-OCC can comprise a factor (for example, a signal) according to wt (l ') = [1-2 ∙ (TD_offsetp)] l'.
[0057] [0057] Alternatively or in addition, the FD-OCC may comprise a factor (for example, a signal) according to wf (k ') = [1-2 ∙ (FD_offsetp)] k'.
[0058] [0058] The configuration message can comprise, for each DM-RS port through which PT-RS is transmitted or received, an instance of the bit field that is indicative of the subcarrier allocated to PT-RS among the subset of subcarriers allocated to the DM-RS transmitted through the corresponding DM-RS port.
[0059] [0059] PT-RS can be transmitted or received through one of the DM-RS ports. The single DM-RS port can be determined according to a predefined rule. For example, DM-RS ports can be grouped into two or more separate DM-RS groups and PT-RS can be transmitted or received through one of the DM-RS ports in each of the DM-RS groups. The single DM-RS port can be determined according to the predefined rule applied to each of the DM-RS groups.
[0060] [0060] The only DM-RS port through which PT-RS is transmitted or received may not be specified in the configuration message. Each of the radio access nodes and the radio device can determine the
[0061] [0061] Each of the DM-RS ports can be uniquely identified by a port index. The one of the DM-RS ports that is determined according to the predefined rule can be the DM-RS port with the lowest port index.
[0062] [0062] PT-RS can understand a tone in the subcarrier allocated to PT-RS. The tone can correspond to a DM-RS tone transmitted through the corresponding DM-RS port on the same subcarrier. In this document, a tone can comprise a complex coefficient (for example, Fourier) carried by a subcarrier or a resource element (for example, for the duration of an OFDM symbol). Each OFDM symbol can comprise a plurality of tones, each transmitted simultaneously on the respective subcarriers. The tone can correspond to a harmonic Fourier component in the time domain for the duration of the symbol. Alternatively or in addition, the tone may refer to modulation in an ER.
[0063] [0063] PT-RS can be transmitted or received in several PRBs. The same subcarrier in relation to the corresponding PRB can be allocated to PT-RS in each of the PRBs. In addition, the same subset of subcarriers can be allocated to DM-RS in each of the PRBs.
[0064] [0064] A transmission waveform may include orthogonal frequency division multiplexing (OFDM), particularly, OFDM cyclic prefix (CP) (CP-OFDM). The tone can be an OFDM tone. The transmission may include a plurality of OFDM symbols per PRB, for example, a time domain slot. Each OFDM symbol can comprise one OFDM tone per subcarrier.
[0065] [0065] Each DM-RS port can be mapped to a plurality of antenna ports according to a pre-encoder. Different DM-RS ports
[0066] [0066] Some or each of the DM-RS ports may be beamed according to the pre-encoder. For example, for single layer (Tx) beam formation on the radio channel, a DM-RS port can be used to access the radio channel. Alternatively, the DM-RS ports can be mapped to the antenna ports (for example, in a one-to-one or a many-to-many match).
[0067] [0067] The number of subcarriers in the sub-set of subcarriers allocated to DM-RS according to a type of DM-RS configuration 1 can be double the number of subcarriers in the sub-set of subcarriers allocated to DM-RS according to a type of DM-RS configuration 2. The same size for the bit field can be used for each DM-RS configuration type 1 and DM-RS configuration type 2. A more significant bit in the bit field can be ignored or set to zero to determine the subcarrier allocated to PT-RS in configuration type 2 of DM-RS.
[0068] [0068] The only aspect can be implemented in the RAN and / or by the radio access node, for example, the RAN. In this document, the expression radio access node can be used interchangeably with a base station or RAN cell. The radio access node can cover any station configured to provide radio access to one or more of the radio devices.
[0069] [0069] According to another aspect, a method is provided for receiving a configuration message for a phase-tracking reference signal, PT-RS, on a radio channel between a radio access node and a radio device . The radio channel comprises a plurality of subcarriers in a physical resource block, PRB. A subset of the subcarriers in the PRB is allocated to a demodulation reference signal, DM-RS. The method comprises or triggers a step of receiving the
[0070] [0070] The sub-carrier allocated to PT-RS can also be mentioned as PT-RS sub-carrier of PT-RS. The subcarriers allocated to DM-RS can also be called DM-RS subcarriers. The subset of subcarriers allocated to the DM-RS (that is, the subset comprising the DM-RS subcarriers) can also be referred to as the DM-RS subset. The DM-RS subset can be an appropriate subset of the plurality of subcarriers in the PRB. In other words, the subset may include fewer subcarriers than a PRB.
[0071] [0071] Through the bit field, the configuration message can signal a relative shift, for example, in relation to the relevant subset of subcarriers allocated to the DM-RS. The parameter or function represented by the bit field can be mentioned as subcarrier offset or resource element offset (RE offset) for PT-RS or briefly: “PTRS-RE-offset”. The method can be implemented as an RE shift signal for PT-RS.
[0072] [0072] The actual subcarrier used for PT-RS may depend on the “PTRS-RE-offset” parameter and the subset of subcarriers allocated to the DM-RS. For example, if a DM-RS port is identified by a DM-RS port number, the actual subcarrier used for PT-RS may depend on the “PTRS-RE-offset” parameter and the DM-RS port number.
[0073] [0073] In addition, a plurality of different DM-RSs can be transmitted on the corresponding DM-RS ports. The DM-RS port number p can be among a set of DM-RS ports used for the radio channel, for example, to perform a channel estimate of the radio channel and / or demodulate the radio channel as a radio channel. data on a receiving side of the
[0074] [0074] To avoid scheduling restrictions and reduce signaling overhead, the value of the bit field, that is, the parameter “PTRS-RE-offset”, represents a relative index of subcarriers in the subset of subcarriers assigned to the DM port -RS on the specific transmission.
[0075] [0075] When transmitting the parameter “PTRS-RE-offset” as the configuration parameter in the bit field of the configuration message, scheduling restrictions can be avoided at least in some modalities, because the group of possible PT-RS subcarriers is restricted to the subset of subcarriers used, allocated or programmed for the DM-RS port associated with the PT-RS port.
[0076] [0076] The same modalities (for example, the modalities in the aforementioned paragraph) or other modalities may require significantly less signaling overhead than the existing displacement signaling, because a common “PTRS-RE-offset” indication can be used to DL and UL. Alternatively or in addition, a common indication can be used for different PT-RS ports on SU-MIMO.
[0077] [0077] The bit field can comprise n bits that are indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS. A number of the plurality of subcarriers in the PRB can be greater than 2n.
[0078] [0078] The subset of subcarriers allocated to the DM-RS can be signaled dynamically.
[0079] [0079] The bit field may comprise 2 or 3 bits that are indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS. The number of the plurality of subcarriers in the PRB can be 12.
[0080] [0080] The bit field can be sized to represent any of the subcarriers in the subset of subcarriers allocated to the
[0081] [0081] The bit field can comprise n bits. A number of subcarriers in the subset of subcarriers allocated to the DM-RS can be equal to or less than 2n.
[0082] [0082] Each subcarrier in the subset of subcarriers allocated to the DM-RS can be uniquely identified by an index. The bit field can be indicative of the index corresponding to the subcarrier allocated to PT-RS.
[0083] [0083] The radio channel can be accessed through one or more DM-RS ports. A DM-RS can be transmitted or received through each DM-RS port. The subset of subcarriers allocated to the DM-RS may depend on the corresponding DM-RS port.
[0084] [0084] The subcarrier allocated to PT-RS can be derived from the bit field for at least one of a PT-RS uplink transmission and a PT-RS downlink transmission.
[0085] [0085] Each of the one or more DM-RS ports can be uniquely identified by a DM-RS port index. Each DM-RS transmission (briefly: DM-RS transmission) can be defined with or associated with a DM-RS port index.
[0086] [0086] One or more DM-RS ports may be located on (or may define) a transmitting side of the radio channel. One or more DM-RS ports can be used (for example, located) on the radio access node for a downlink transmission. Alternatively or in addition, one or more DM-RS ports may be used (for example, located at) by the radio device for an uplink link transmission.
[0087] [0087] Alternatively or in addition, one or more DM-RS ports may be located on (or may define) a receiving side of the radio channel. For example, the transmitting side can initially define the ports
[0088] [0088] Transmission through the radio channel may comprise one or more layers (also known as spatial flows). The number of layers can be equal to the number of DM-RS ports used for transmission over the radio channel. The radio channel can be a multiple input and multiple output (MIMO) channel accessed through the DM-RS ports on the transmitting side (ie the MIMO channel input), optionally mapped to a plurality of transmitting antennas, and being received through a plurality of receiver ports formed by antennas on the receiver side (ie, the MIMO channel output).
[0089] [0089] The multiple transmitted layers can be separated in the spatial and / or polarization domain by a transmission pre-decoder and separated in the receiver, performing a channel estimate and, optionally, suppressing interfering layers for the radio channel based DM-RS and / or PT-RS received on the receiving side. For example, the transmission may be a multi-layer single-user MIMO transmission (SU-MIMO), in which two or more layers can be accessed through two or more DM-RS ports.
[0090] [0090] The DM-RS can be used for at least one of the pre-coding on the transmitting side and demodulation of the radio channel on the receiving side.
[0091] [0091] The subset of subcarriers allocated to the DM-RS may depend on the corresponding DM-RS port. For each of the DM-RS ports,
[0092] [0092] The PRB can comprise 12 subcarriers provided with an index k ∈ {0, ..., 11}. The subset of subcarriers allocated to the DM-RS being transmitted through the DM-RS p port can be given by {2 ∙ R ∙ m + S ∙ k ’+ Δ (p) ∈ {0,…, 11} | k ’∈ {0, 1}, 0 ≤ m <6 / R}, where R = 1, 2 or 3; S = 1 or 2; and an offset Δ (p) depends on the DM-RS p port.
[0093] [0093] For a DM-RS type 1 configuration, the parameters can be R = 2 S = 2 and Δ (p) ∈ {0, 1}. For a DM-RS type 2 configuration, the parameters can be R = 3 S = 1 and Δ (p) ∈ {0, 2, 4}. In the expression above for
[0094] [0094] The DM-RS can be derived from a sequence r (2 ∙ m + k '+ n0), start start where n0 = N BWP, i N scRB / R, N BWP, i is the beginning of the bandwidth
[0095] [0095] A different DM-RS can be transmitted through each of the DM-RS's ports. As different DM-RSs (eg orthogonal signals) are transmitted on different DM-RS ports, any dependency on the “DM-RS” can be expressed equally as a dependency on the corresponding “DM-RS port”.
[0096] [0096] DM-RSs transmitted through different DM-RS ports can be distinguished by at least one orthogonal coverage code in the
[0097] [0097] For example, each of the DM-RSs transmitted through different DM-RS ports can use separate subsets of subcarriers or be orthogonally encoded in the frequency domain.
[0098] [0098] One of the DM-RS ports can be associated with PT-RS. PT-RS can be transmitted or received through the DM-RS port associated with PT-RS. The PT-RS can be transmitted or received on the subcarrier which is allocated to the PT-RS according to the bit field between the subset of subcarriers allocated to the DM-RS transmitted over the same DM-RS port.
[0099] [0099] PT-RS and DM-RS can be transmitted simultaneously or separately (for example, in different OFDM symbols or different PRBs, that is, different slots or transmission time intervals, TTIs). In addition, the transmission of PT-RS and transmission of DM-RS can overlap. A PT-RS transmission duration can be longer (for example, several times longer) than a DM-RS transmission duration. For example, PT-RS can be transmitted or received during a PRB comprising 14 OFDM symbols. The DM-RS can be transmitted during one or two OFDM symbols.
[00100] [00100] The subcarrier allocated to the PT-RS can be derived or derivable from the bit field for at least one of the PT-RS uplink link transmission and a PT-RS downlink link transmission.
[00101] [00101] The radio access node can be configured to access the radio channel through the DM-RS ports for a downlink transmission to the radio device. The method can also comprise or trigger a step of receiving the PT-RS transmitted or received by at least one of the DM-RS ports in the subcarrier allocated to the PT-RS according to the bit field between the subset of subcarriers allocated to the DM- RS to the corresponding DM-RS port.
[00102] [00102] Alternatively or in addition, the radio device can be configured to access the radio channel through DM-RS ports for an uplink transmission to the radio access node. The method can also comprise or trigger a transmission or reception step of the PT-RS through at least one of the DM-RS ports in the subcarrier allocated to the PT-RS according to the bit field between the subset of subcarriers allocated to the DM-RS to the corresponding DM-RS port.
[00103] [00103] A DM-RS port through which PT-RS is transmitted or received can also be referred to as PT-RS port. The expression “PT-RS” can collectively refer to the different PT-RSs transmitted or received on different DM-RS ports (port-specific PT-RS). Alternatively or in addition, the expression “PT-RS” can refer to the port-specific PT-RS, for example, in the context of a certain PT-RS port.
[00104] [00104] The radio access node can provide access to at least one radio device on the radio channel. For each radio device, PT-RS can be transmitted or received via one or two DM-RS ports.
[00105] [00105] The radio channel can comprise a SU-MIMO channel (Multiple Input and Multiple Output Channel) that is accessed through two or more DM-RS ports. PT-RS can be transmitted or received on each of the at least two of the two or more DM-RS ports. The radio channel may comprise two or more layers and / or two or more DM-
[00106] [00106] The radio channel can comprise a multi-user channel with multiple inputs and multiple outputs (MU-MIMO). DM-RS groups other than DM-RS ports can provide access to different radio devices. PT-RS can be transmitted or received through at least one DM-RS port in each DM-RS group.
[00107] [00107] The MU-MIMO channel can comprise, for each of the multiple radio devices, at least one layer or at least one DM-RS port. For each of the multiple radio devices, PT-RS can be transmitted or received in at least one layer or through at least one DM-RS port.
[00108] [00108] The subcarrier allocated to PT-RS can be determined exclusively between the subset of subcarriers allocated to DM-RS based on a combination of the bit field in the configuration message and the DM-RS port through which PT-RS is transmitted or received.
[00109] [00109] The same bit field value can be indicative of different subcarriers allocated to PT-RS transmitted or received through different DM-RS ports.
[00110] [00110] The bit field can be indicative of two or more subcarriers candidates for PT-RS among the subset of subcarriers allocated to DM-RS. The subcarrier allocated to PT-RS can be determined among the candidate subcarriers based on the DM-RS port through which the PT-RS is transmitted or received, for example, depending on the DM-RS p port index or based on on the DM-RS port through which the PT-RS is transmitted or received.
[00111] [00111] The subcarrier allocated to PT-RS transmitted or received by port DM-RS can be given by 2 ∙ R ∙ m + S ∙ k ’+ Δ (p). The bit field can be indicative of m. The value for k 'can be determined by the DM-
[00112] [00112] PT-RS can be transmitted or received through each of the at least two different DM-RS ports. Alternatively or in combination, PT-RS can be transmitted in each of an uplink link transmission and a downlink link transmission.
[00113] [00113] The DM-RS transmitted through the DM-RS p-port may be subject to an orthogonal coverage code, OCC, in the time domain, TD-OCC. Alternatively or in addition, the DM-RS transmitted via the DM-RS p-port can be subjected to an OCC in the frequency domain, FD-OCC. The subcarrier allocated to the PT-RS can be determined between the subset of subcarriers allocated to the DM-RS based on a combination of the bit fields, a DM-RS port dependency on the TD-OCC and a DM-RS port dependency on the FD-OCC. The combination can include the sum.
[00114] [00114] For example, the DM-RS port dependency of TD-OCC can comprise TD_offsetp = (p-1000 div 2) div R or TD_offsetp = floor ((p-1000) / (2 ∙ R)))
[00115] [00115] for the DM-RS p port. Alternatively or in combination, the dependency on the DM-RS port of the FD-OCC can comprise FD_offsetp = p mod 2
[00116] [00116] for the DM-RS p port.
[00117] [00117] In this document, R can be equal to 2 for configuration type 1 of DM-RS or equal to 3 for configuration type 2 of DM-RS.
[00118] [00118] The TD-OCC can comprise a factor (for example, a signal) according to wt (l ') = [1-2 ∙ (TD_offsetp)] l'.
[00119] [00119] Alternatively or in addition, the FD-OCC may comprise a factor (for example, a signal) according to wf (k ') = [1-2 ∙ (FD_offsetp)] k'.
[00120] [00120] The configuration message may comprise, for each DM-RS port through which PT-RS is transmitted or received, an instance of the bit field that is indicative of the subcarrier allocated to PT-RS among the subset of subcarriers allocated to the DM-RS transmitted through the corresponding DM-RS port.
[00121] [00121] PT-RS can be transmitted or received through one of the DM-RS ports. The single DM-RS port can be determined according to a predefined rule. For example, DM-RS ports can be grouped into two or more separate DM-RS groups and PT-RS can be transmitted or received through one of the DM-RS ports in each of the DM-RS groups. The single DM-RS port can be determined according to the predefined rule applied to each of the DM-RS groups.
[00122] [00122] The only DM-RS port through which PT-RS is transmitted or received may not be specified in the configuration message. Each of the radio access nodes and the radio device can determine the only DM-RS port through which PT-RS is transmitted or received by applying the predefined rule independently.
[00123] [00123] Each of the DM-RS ports can be uniquely identified by a port index. The one of the DM-RS ports that is determined according to the predefined rule can be the DM-RS port with the lowest port index.
[00124] [00124] PT-RS may comprise a tone in the subcarrier allocated to PT-RS. The tone can correspond to a DM-RS tone transmitted through the corresponding DM-RS port on the same subcarrier. In this document, a tone can comprise a complex coefficient (for example, Fourier) carried by a subcarrier or a feature element (for example,
[00125] [00125] PT-RS can be transmitted or received in several PRBs. The same subcarrier in relation to the corresponding PRB can be allocated to PT-RS in each of the PRBs. In addition, the same subset of subcarriers can be allocated to DM-RS in each of the PRBs.
[00126] [00126] A transmission waveform may include orthogonal frequency division multiplexing (OFDM), particularly, OFDM cyclic prefix (CP) (CP-OFDM). The tone can be an OFDM tone. The transmission may include a plurality of OFDM symbols per PRB, for example, a time domain slot. Each OFDM symbol can comprise one OFDM tone per subcarrier.
[00127] [00127] Each DM-RS port can be mapped to a plurality of antenna ports according to a pre-encoder. Different DM-RS ports can be mapped according to different pre-encoders.
[00128] [00128] Some or each of the DM-RS ports can be beamed according to the pre-encoder. For example, for single layer (Tx) beam formation on the radio channel, a DM-RS port can be used to access the radio channel. Alternatively, the DM-RS ports can be mapped to the antenna ports (for example, in a one-to-one or a many-to-many match).
[00129] [00129] The number of subcarriers in the sub-set of subcarriers allocated to DM-RS according to a type of DM-RS configuration 1 can be double the number of subcarriers in the sub-set of subcarriers allocated to DM-RS according to a type configuration 2
[00130] [00130] The other aspect of the method can also comprise any feature or step described in the context of any aspect of the method. In addition, the other aspect of the method may comprise a characteristic or step corresponding to any of those of the single aspect.
[00131] [00131] The other aspect of the method can be performed by one or more radio devices, for example, in the RAN. The radio device or each of the radio devices can be user equipment (UE).
[00132] [00132] As for an aspect of the system, a method of transmitting or receiving a configuration message for a phase tracking reference signal (PT-RS) on a radio channel between a radio access node and a radio device. The radio channel comprises a plurality of subcarriers in a physical resource block (PRB). A subset of the subcarriers in the PRB is allocated for a demodulation reference signal (DM-RS). The method comprises or triggers a step of transmitting the configuration message to the radio device. The configuration message comprises a bit field that is indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS. The method additionally comprises or triggers a step of receiving the radio access node configuration message. The configuration message comprises the bit field that is indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS.
[00133] [00133] As for another aspect of the system, a system is provided for transmitting and receiving a configuration message for a
[00134] [00134] The system can be incorporated by at least one among a radio access node and a radio device.
[00135] [00135] In any aspect, the radio device can be configured for point-to-point communication (for example, on a side connection) and / or to access the RAN (for example, an uplink, UL and / or a downlink) , DL). The radio device can be a user equipment (UE, for example, a 3GPP UE), a mobile or portable station (STA, for example, a Wi-Fi STA), a machine-type communication device (MTC) or a combination of them. Examples for the UE and the mobile station include a cell phone and a tablet. Examples for the portable station include a laptop and a television set. Examples for the MTC device include robots, sensors and / or actuators, for example, in manufacturing, automotive communication and home automation. The MTC device can be implemented in home appliances and consumer electronics. Examples for the combination include a vehicle
[00136] [00136] Examples for the base station may include a 3G or Node B base station, 4G or eNodeB base station, 5G or gNodeB base station, an access point (for example, a Wi-Fi access point) and a controller network (for example, according to Bluetooth, ZigBee or Z-Wave).
[00137] [00137] The RAN can be implemented according to the Global Mobile Communications System (GSM), the Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE) and / or New Radio (NR).
[00138] [00138] The technique can be implemented in a physical layer (PHY), a medium access control layer (MAC), a Radio Link Control layer (RLC layer) and / or Radio Resource Control layer ( RRC) of a protocol stack for radio communication.
[00139] [00139] As for another aspect, a computer program product is provided. The computer program product comprises parts of the program code to perform any of the steps of the method aspects described in this document when the computer program product is run by one or more computing devices. The computer program product can be stored on a computer-readable recording medium. The computer program product can also be provided for download via a data network, for example, via RAN and / or via the Internet and / or via the base station. Alternatively or in addition, the method can be encoded in a Field Programmable Gate Array (FPGA) and / or an Application Specific Integrated Circuit (ASIC), or the functionality can be provided for download via a description language of hardware.
[00140] [00140] A device aspect refers to a device configured to perform the appearance of a method. Alternatively or beyond
[00141] [00141] In addition, for each aspect of the method, a device can comprise at least one processor and a memory. Said memory comprises instructions executable by said at least one processor, by which the device is operational to perform the aspect of the corresponding method.
[00142] [00142] The device (or any node or station to incorporate the technique) can also include any resource described in the context of the aspect of the method. In particular, any of the units and modules, or a dedicated unit or module, can be configured to perform or trigger one or more of the steps in any aspect of the method. Brief Description of Drawings
[00143] [00143] Additional details of the modalities of the technique are described with reference to the accompanying drawings, in which: Fig. 1 shows a schematic block diagram of a device for transmitting a configuration message to a phase tracking reference signal; Fig. 2 shows a schematic block diagram of a device for receiving a configuration message for a phase tracking reference signal; Fig. 3 shows a flow chart for a method of transmitting a configuration message to a phase tracking reference signal, which is implementable by the device of Fig. 1; Fig. 4 shows a flow chart for a method of receiving a configuration message for a reference signal
[00144] [00144] In the following description, for the purpose of explanation and not limitation, specific details are established, such as a network environment, in order to provide a complete understanding of that described in this document. It will be evident to a person skilled in the art that the technique can be practiced in other modalities that depart from these specific details. In addition, although the following modalities are mainly described
[00145] [00145] In addition, those skilled in the art will recognize that the functions, steps, units and modules explained in this document can be implemented using software working in conjunction with a programmed microprocessor, an Application Specific Integrated Circuit (ASIC), an Array of Ports Field Programmable (FPGA), a Digital Signal Processor (DSP) or a general purpose computer, for example, including an Advanced RISC Machine (ARM). It will also be recognized that, although the following modalities are described primarily in context with methods and devices, the invention can also be incorporated into a computer program product, as well as a system comprising at least one computer processor and memory coupled to the computer. at least one processor, where the memory is encoded with one or more programs that can perform the functions and steps or implement the units and modules described in this document.
[00146] [00146] Fig. 1 schematically illustrates a block diagram of a device for transmitting a configuration message for a phase tracking reference signal (PT-RS) on a radio channel between a radio access node and a radio device. The device is referred to generically by the reference signal 100. The radio channel comprises a plurality of subcarriers in a physical resource block (PRB). A subset of the subcarriers in the PRB is allocated for a demodulation reference signal (DM-RS). The device 100 comprises a module of
[00147] [00147] Device 100 can be connected and / or part of the RAN. Device 100 may be incorporated by or into the radio access node (for example, a RAN base station), nodes connected to the RAN to control the base station or a combination thereof.
[00148] [00148] Optionally, device 100 comprises a PT-RS 104 module for at least one of transmitting, receiving and processing PT-RS according to the configuration. Alternatively or in addition, device 100 comprises a DM-RS module 106 for at least one of transmitting, receiving and processing the DM-RS. The PT-RS 104 module can be a function or sub-module of the DM-RS 106 module.
[00149] [00149] Any of the modules of device 100 can be implemented by units configured to provide the corresponding functionality.
[00150] [00150] Fig. 2 schematically illustrates a block diagram of a device for receiving a configuration message for a phase tracking reference signal (PT-RS) on a radio channel between a radio access node and a radio device. The device is referred to generically by the reference signal 200. The radio channel comprises a plurality of subcarriers in a physical resource block (PRB). A subset of the subcarriers in the PRB is allocated for a demodulation reference signal (DM-RS). The device 200 comprises a configuration receiving module 202 that receives the configuration message from the radio access node. The configuration message comprises a bit field that is indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS.
[00151] [00151] The device 200 can be incorporated by or in the radio device.
[00152] [00152] Optionally, device 200 comprises a PT-RS 204 module for at least one of transmitting, receiving and processing the PT-RS according to the configuration. Alternatively or in addition, device 200 comprises a DM-RS module 206 for at least one of transmitting, receiving and processing the DM-RS. The PT-RS 204 module can be a function or sub-module of the DM-RS 206 module.
[00153] [00153] Any of the modules of device 200 can be implemented by units configured to provide the corresponding functionality.
[00154] [00154] In this document, the radio access node can comprise a network controller (for example, a Wi-Fi access point) or a cellular radio access node (for example, a 3G Node B, an eNodeB 4G or a 5G gNodeB). The radio access node can be configured to provide radio access to the radio device. Alternatively or in addition, the radio device may include a mobile or portable station, user equipment (UE), particularly a machine-type communication device (MTC) and a bandwidth Internet of Things (NB-IoT) device narrow. Two or more instances of the radio device can be configured to connect wirelessly, for example, over an ad-hoc radio network or via 3GPP side links.
[00155] [00155] Fig. 3 shows a flow chart for a method 300 of transmitting a configuration message to a PT-RS on a radio channel between a radio access node and a radio device. The radio channel comprises a plurality of subcarriers in one (for example, each) PRB. A subset of the subcarriers in the PRB is allocated to a DM-RS. In step 302 of method 300, the configuration message is transmitted to the radio device. The configuration message comprises
[00156] [00156] In this document, “a subcarrier allocated to PT-RS” can cover a subcarrier that is used to transmit PT-RS or is programmed to transmit PT-RS. In addition, “a sub-carrier allocated to PT-RS” may cover two or more candidate sub-carriers, one of which is eventually allocated to PT-RS (for example, used or programmed for PT-RS). For example, “a sub-carrier allocated to PT-RS” may cover a zero-power PT-RS, that is, the sub-carrier is a PT-RS sub-carrier, but the radio access node (for example, a gNB) is not transmitting nothing about the referred PT-RS subcarrier. This PT-RS subcarrier can be used by another radio access node (for example, another gNB). In this way, interference can be avoided in the said subcarrier.
[00157] [00157] Optionally, in step 304, the PT-RS is processed, transmitted and / or received in the subcarrier allocated to the PT-RS according to the bit field.
[00158] [00158] The allocated subcarrier may also depend on a DM-RS port through which the PT-RS is transmitted. For example, a subcarrier index allocated to PT-RS can be a function of the bit field and an index of the DM-RS port. In a modality, which is compatible with any modality described in this document, the bit field can exclusively determine the subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS. In another modality, which is compatible with any described modality, the bit field alone does not indicate, exclusively, within the subset of subcarriers allocated to DM-RS, the subcarrier for PT-RS. An additional dependency on the DM-RS port used to transmit PT-RS can eliminate the latter ambiguity, so that the combination of port index and bit field determines
[00159] [00159] In a step 306, which can be simultaneous with step 304, the DM-RS is processed, transmitted and / or received. Alternatively or in addition, the radio access node can signal changes to a DM-RS configuration on and / or to the radio device.
[00160] [00160] Method 300 can be performed by device 100, for example, on or using the radio access node (for example, for RAN). For example, modules 102, 104 and 106 can perform steps 302, 304 and 306, respectively.
[00161] [00161] Fig. 4 shows a flow chart for a method 400 of receiving a configuration message for a PT-RS on a radio channel between a radio access node and a radio device. The radio channel comprises a plurality of subcarriers in one (for example, each) PRB. A subset of the subcarriers in the PRB is allocated to a DM-RS. In step 402 of method 400, the configuration message is received from the radio access node. The configuration message comprises a bit field that is indicative of at least one subcarrier allocated to PT-RS among the subset of subcarriers allocated to DM-RS.
[00162] [00162] Optionally, in step 404, PT-RS is processed, transmitted and / or received in the subcarrier allocated to PT-RS according to the bit field. For example, the subcarrier allocated to the PT-RS can be determined in step 404 based on the bit field and, optionally, a DM-RS port on which the PT-RS is transmitted.
[00163] [00163] The radio device can process, transmit and / or receive the DM-RS according to the configuration message or other configuration received from the access node in step 406.
[00164] [00164] Method 400 can be performed by device 200, for example, on or using the radio device. For example, modules 202, 204 and 206 can perform steps 402, 404 and 406, respectively.
[00165] [00165] Fig. 5 schematically illustrates an exemplary environment 500, for example, an independent radio access network (RAN) or cellular to implement the technique. The environment 500 comprises a plurality of radio channels 502 between modalities of the devices 100 and 200, respectively. In environment 500 of Fig. 5, device 100 is incorporated by at least one base station or radio access node 510, which provides radio access or controls radio communications for at least one radio device 512, which incorporates the device 200. It is not necessary for all radio devices 512 in radio communication 502 with radio access node 510 to incorporate device 200.
[00166] [00166] In NR, the phase tracking reference signal (PT-RS) can be configured for downlink and uplink transmissions so that the receiver corrects errors related to phase noise. The configuration of the PT-RS is specific to the UE and it is agreed that the PT-RS is associated with one of the DM-RS ports used for transmission, which means that the DM-RS and its associated PT-RS are transmitted using the same pre-encoder and meaning that the modulated symbol used for the PT-RS is taken from the DM-RS, whatever the configured DM-RS sequence. This means that there is no specific configuration of the PT-RS sequence, as it is borrowed from the DM-RS.
[00167] [00167] The UE must assume that the PDSCH DM-RS is mapped to physical resources according to type 1 or type 2, as indicated by the upper layer parameter DL-DM-RS-config-type.
[00168] [00168] The UE must assume that the sequence r (m) is mapped to elements of physical resources according to ak (p, l, µ) = β DMRS wf (k ′) ⋅ wt (l ′) ⋅ r (2 m + k ′ + n 0) 4 m + 2k ′ + ∆ Configurat ion type 1 Configuration k =   6m + k ′ + ∆ Configuration Configurat ion type 2 k ′ = 0, 1 l = {l 0, l} + l ′
[00169] [00169] under the condition that the resource elements (REs) are within the resources allocated for PDSCH transmission. The functions wf (k ′), w (l ′) t and ∆ depend on the DM-RS port p according to the Tables
[00170] [00170] A reference point for the identification of subcarrier k is the beginning of the part of the bandwidth of operator i in which the physical downlink shared channel (PDSCH) is transmitted with k = 0 corresponding to the lowest subcarrier in the part of the bandwidth. The n 0 offset is given by  N BWP, start RB i N sc 2 for DM - RS configurat ion type 1 configuration n0 =  start RB  N BWP, i N sc 3 for DM - RS configurat ion type 2 configuration start at that NBWP, i is the beginning of the part of the carrier bandwidth on which the physical uplink shared channel (PUSCH) is transmitted.
[00171] [00171] In the time domain (TD), the reference point for l and l0 position of the first DM-RS symbol depends on the type of mapping. For PDSCH type A mapping, l is defined in relation to the beginning of l0 = 3 slot and if the upper layer parameter DL-DMRS-typeA-pos is equal to l0 = 2 3e otherwise. For type B mapping of PDSCH, l is set l0 = 0 in relation to the beginning of the programmed PDSCH resources e.
[00172] [00172] One or more positions of additional DM-RS symbols are given by the last OFDM symbol used for PDSCH in the slot according to Tables 7.4.1.1.2-3 and 7.4.1.1.2-4 in section 7.4 of the document 3GPP TS
[00173] [00173] The time domain index l ′ and the supported antenna ports p are provided in Table 7.4.1.1.2-5 in section 7.4 of document 3GPP TS 38.211 (for example, version 1.0.0) or in the table of example below. A single-symbol DM-RS is used, if the upper layer parameter
[00174] [00174] In Fig. 6 and Fig. 7, the mapping of the different DM-RS ports for configuration types 1 and 2 of the DM-RS is shown for single cases with frontal loading. In some modalities, PT-RS is not programmed when using an orthogonal coverage code for DM-RS in the time domain, that is, TD-OCC for DM-RS. In such modalities, PT-RS is not transmitted when using DM-RS ports 1004 to 1007 for configuration type 1 of DM-RS and ports 1006 to 1011 for configuration type 2 of DM-RS.
[00175] [00175] Regarding the mapping of PT-RS in the frequency domain, 3GPP agreed that each port of PT-RS is programmed with a maximum of 1 subcarrier per PRB. In addition, it was agreed that the subcarrier used for a PT-RS port should be one of the subcarriers also used for the DM-RS port associated with the PT-RS port.
[00176] [00176] Fig. 8 schematically illustrates an example for an allocation of radio resources 600 in a PRB 602 comprising a grid of resource elements (RE) 604 in time 606 (for example, in units of OFDM symbols) and frequency 608 (for example, in subcarrier units). Although allocation 600 schematically illustrated in Fig. 8 also includes time domain (TD) 606 to illustrate the different
[00177] [00177] A PRB 602 duration can correspond to a 610 slot.
[00178] [00178] The example allocation of 600 subcarriers to PT-RS is valid. In other words, the mapping of PT-RS to REs 604 is allowed, since the subcarrier allocated to PT-RS is in the subset of subcarriers allocated to DM-RS. In contrast, example allocation 600 schematically illustrated in Fig. 9 is not a permitted PT-RS mapping.
[00179] [00179] Therefore, if a comb-based structure is used for DM-RS with repetition factor (RPF) R = 2 (as in the DM-RS 1 configuration type), the DM-RS is mapped to each subcarrier second , that is, the subset of subcarriers allocated to DM-RS covers only all second subcarriers in PRB 602. Consequently, the technique ensures that PT-RS is mapped to only one of the six DM-RS subcarriers in the subset of 12 subcarriers in this Exemplary PRB 602.
[00180] [00180] In NR, a PRB has 12 subcarriers. Consequently, the set of subcarriers of a PRB 602 is {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}. In existing solutions, “PTRS-RE-offset” can be defined as any value in the set. However, this solution can lead to unsupported cases, in which a PT-RS port is not mapped to a subcarrier of the subset of subcarriers used by the DM-RS port associated with the PT-RS port. For example, for the DM-RS 1 configuration type with PT-RS associated with DM-RS port 1000 and port 1000 maps to {0,2,4,8,10,12} or {0,2, 4,6,8,10} or all subcarriers, then “PTRS-RE-offset” configured by the RRC to be equal to any of 1,3,5,7,9 or 11 will lead to an unsupported case, the which implies a restriction of
[00181] [00181] If the conventional “PTRS-RE-offset” configured by the RRC layer is equal to 1, 3, 5, 7, 9 or 11, only DM-RS ports {1002, 1003, 1006, 1007} for the type configuration settings DM-RS 1 can be used for PDSCH or PUSCH (since these DM-RS ports have the subcarrier offset ∆ = 1 according to Table 7.4.1.1.2-1 above), which is a restriction of scheduling.
[00182] [00182] Below, table 1 and table 2 represent the existing codification of the conventional parameter “PTRS-RE-offset” for the types of configuration DM-RS 1 and 2, respectively. In addition, the last column indicates the DM-RS port group for which the corresponding “PTRS-RE-offset” value leads to a supported case.
[00183] [00183] The existing encoding requires 4 bits to represent the “PTRS-RE-offset”. Table 1 below describes a bitmap for the existing coding of the conventional code “PTRS-RE-offset” for type 1 configuration of DM-RS. Subcarrier offset value used for PT- Compatible DM-RS ports PTRS-RE RS 0000 0 1000/1001/1004/1005 0001 1 1002/1003/1006/1007 0010 2 1000/1001/1004/1005 0011 3 1002/1003 / 1006/1007 0100 4 1000/1001/1004/1005 0101 5 1002/1003/1006/1007 0110 6 1000/1001/1004/1005 0111 7 1002/1003/1006/1007 1000 8 1000/1001/1004/1005 1001 9 1002/1003/1006/1007 1010 10 1000/1001/1004/1005 1011 11 1002/1003/1006/1007
[00184] [00184] Likewise, Table 2 below describes a bitmap for the existing encoding of the conventional "PTRS-RE-offset" for type 2 DM-RS configuration. Offset value of compatible DM-RS Ports Subcarrier used for PT-RS PTRS-RE 0000 0 1000/1001/1006/1007 0001 1 1000/1001/1006/1007 0010 2 1002/1003/1008/1009 0011 3 1002/1003 / 1008/1009 0100 4 1004/1005/1010/1011
[00185] [00185] The technique can reduce signaling overhead (for example, in comparison with the existing convention parameter coding) by transmitting a “PTRS-RE-offset” parameter (ie the bit field) used or usable to generate an index relative to one of the elements in the subset of subcarriers used or allocated to the DM-RS port associated with PT-RS.
[00186] [00186] Any modality described in this document can implement at least one of the following resources. A subset Sp of subcarriers used (or allocated to) by the DM-RS port p is defined within a PRB 602. An index relative to one of the elements of Sp is denoted as IRel. The relative index is defined (for example, generated or derived) as a function of the PTRS-RE-offset bit field and, optionally, the port number p in accordance with: IRel = f (PTRS-RE-offset, p) .
[00187] [00187] The PT-RS subcarrier is determined by Sp (IRel), where Sp (∙) indicates the ordered subset Sp, for example, a matrix.
[00188] [00188] The sub-assemblies, Sp, of subcarriers for DM-RS ports are shown in Table 3 and Table 4 for DM-RS configuration types 1 and 2, respectively, in the case of a single-symbol DM-RS.
[00189] [00189] Below, Table 3 lists the sub-sets of subcarriers for configuration type 1 of the DM-RS, assuming a single-symbol DM-RS. The subsets depend on the DM-RS p port. Sub-set of sub-carriers Porta DM-RS, DM-RS in PRB, p Sp 1000 {0,2,4,6,8,10} 1001 {0,2,4,6,8,10} 1002 {1,3, 5,7,9,11} 1003 {1,3,5,7,9,11}
[00190] [00190] Below, Table 4 lists the subsets of subcarriers for configuration type 2 of the DM-RS, assuming a single-symbol DM-RS. The subsets depend on the DM-RS p port. Sub-set of sub-carriers Porta DM-RS, DM-RS in PRB, p Sp 1000 Sp = {0,1,6,7} 1001 Sp = {0,1,6,7} 1002 Sp = {2,3,8, 9} 1003 Sp = {2,3,8,9} 1004 Sp = {4,5,10,11} 1005 Sp = {4,5,10,11}
[00191] [00191] In a first variant, which can be implemented in any modality described in this document, the bit field is indicative of the relative index. The first variant can provide total flexibility for the base station or network when configuring the subcarrier to be used by PT-RS.
[00192] [00192] For total indication flexibility, the relative index can be used as the bit field, that is, the function can be f (PTRS-RE-offset, p) = PTRS-RE-offset. (Eq. 1)
[00193] [00193] Therefore, the relative index is fixed and equal to the configured parameter PTRS-RE-offset of RRC. The relative index does not depend dynamically on the associated DM-RS port.
[00194] [00194] The relative index selects a subcarrier among the subcarriers used by the DM-RS ports used for specific PDSCH or PUSCH planning. If more than one DM-RS port is used for scheduling data, a predefined rule will be used, such as that the PT-RS port is associated with the DM-RS port with the lowest index.
[00195] [00195] Based on the subsets defined in Table 3 and Table 4 for the respective types of DM-RS configuration, the value of the bit field, that is, the relative index PTRS-RE-offset can be indicative of the subcarrier for PT-RS in the PRB. As the subsets are complete for a given DM-RS port, coding according to the first variant provides total flexibility when configuring the corresponding PT-RS subcarrier for the DM-RS ports. Without limitation, the coding of
[00196] [00196] An example to implement the first variant below. If a PT-RS port associated with DM-RS 1000 port (with S1000 = {0,2,4,6,8,10}) and PTRS-RE-offset = 2 (ie 010 in binary representation) has been configured to the UE using RRC signaling, then the PT-RS is mapped to the S1000 (2) = 4 subcarrier. If a MIMO transmission is used, where DM-RS ports 1000,1001,1002 and 1003 are used, a predefined rule will apply that the lowest indexed DM-RS port (1000 in this case) is used to determine the subcarrier for the PT-RS port according to the described rule (ie Table 3 or 4).
[00197] [00197] In the case of several DM-RS groups being configured, the procedure is applied per DM-RS group, therefore, a PT-RS subcarrier is selected per DM-RS group.
[00198] [00198] When receiving PDSCH, the UE must assume that the PT-RS is present in this subcarrier and when transmitting PUSCH, the UE must transmit the PT-RS in that subcarrier in the PRBs assigned to the transmission of PT-RS.
[00199] [00199] Modalities of the first variant can reduce the RRC signaling overhead to 3 bits. In addition, a common “PTRS-RE-offset” indication for downlink (DL) and uplink (UL) can be used, because any value of the “PTRS-RE-offset” parameter can be used with any DM- LOL. Therefore, a common “PTRS-RE-offset” indication can be applied for DL and UL. Signaling overhead is reduced over existing coding and / or further reduced over a separate implementation of the technique for UL and DL.
[00200] [00200] In addition, the first variant can be implemented to avoid the DC subcarrier, since the RRC signaling can control which subcarriers PT-RS can be mapped to (depending on the DM-RS port used).
[00201] [00201] To have a harmonized signaling for DM-RS configuration types 1 and 2, for DM-RS configuration type 2 only the 2 LSB (for example, the 2 least significant bits) of PTRS-RE- offset are used to generate the relative index. As a result, a common value and / or size (or signal format) for the PTRS-RE-offset, that is, for the bit field, can be used together with DM-RS configuration types 1 and 2 . In addition, the configuration message, that is, the PTRS-RE-offset parameter does not need to be transmitted or signaled again (for example, to comply with a format dependent on the configuration for the bit field) when changing the type of DM-RS configuration used in transmission.
[00202] [00202] However, for the SU-MIMO case with more than one PT-RS port programmed, an independent PTRS-RE-offset indication is required for all PT-RS ports. The main reason is that if PT-RS ports are associated with DM-RS ports with the same subset of subcarriers, with the PTRS-RE-offset indication that PT-RS ports would be mapped to the same subcarrier (meaning a high level of interference between PT-RS ports). Therefore, independent indication is required.
[00203] [00203] Below Table 5 represents the index of the subcarrier (that is, the actual index in the PRB and not the relative index in the subset) as derived from the bit field, that is, the “PTRS-RE-offset” parameter in the first column, as an implementation of the technique. Table 5 can be implemented as a coding mechanism for total flexibility based on the “PTRS-RE-offset” parameter.
[00204] [00204] Without limitation, table 5 below assumes configuration type 1 of the DM-RS and a single-symbol DM-RS. PTRS-RE-offset, by subcarrier index for mapping PT-RS in the PRB example, signaled by Port 1000 of Port 1001 of DM- Port 1002 of Port 1003 of DM-RRC DM-RS RS DM-RS RS 000 0 0 1 1 001 2 2 3 3
[00205] [00205] Below, Table 6 represents the index of the subcarrier as derived from the bit field, that is, the parameter “PTRS-RE-offset” in the first column, as an implementation of the technique. Table 6 can be implemented as a coding mechanism for total flexibility based on the “PTRS-RE-offset” parameter.
[00206] [00206] Table 6 below refers to a type of DM-RS configuration with a smaller subset, so that the MSB (for example, most significant bit) in the “PTRS-RE-offset” parameter is ignored. Without limitation, Table 6 assumes configuration type 2 of the DM-RS and a single-symbol DM-RS. PTRS-RE- Index of subcarriers for PT-RS offset, by Port 1000 Port 1001 Port 1002 of Port 1003 Port 1004 Port 1005 example, from DM-RS DM-RS DM-RS from DM DM-RS from DM -RS signaled by
[00207] [00207] In a second variant, which can be implemented in any modality described in this document, the bit field is indicative of a relative index with reduced flexibility.
[00208] [00208] To further reduce signaling overhead and be able to use the common “PTRS-RE-offset” indication for all PT-RS ports programmed for SU-MIMO, an alternative function (ie, a function applied in the second variant) to generate the relative index can be defined.
[00209] [00209] An example for the function according to the second variant is f (PTRS-RE-offset, p) = 2 ∙ PTRS-RE-offset + offsetp, (Eq. 2)
[00210] [00210] where offsetp is a parameter related to the OCC values used by the DM-RS p port. Therefore, the relative index also depends dynamically on one or more DM-RS ports selected for
[00211] [00211] The offsetp value for DM-RS port p can be obtained as offsetp = p mod 2. The function in Eq. 2 reduces the flexibility of the indication, because not all PT-RS ports can be mapped to any subcarrier. However, this reduction in flexibility does not affect performance, for example, because the 510 or RAN base station is still enabled to avoid the DC subcarrier for any PT-RS port.
[00212] [00212] The offsetp parameter ensures that two PT-RS ports associated with DM-RS ports with the same comb, but different OCC are mapped to different subcarriers for the same PTRS-RE-offset value. Therefore, a common indication of PTRS-RE-offset for SU-MIMO (ie, for the number of PT-RS ports greater than 1) is activated. Alternatively or in addition, if two or more 512 UEs have been configured with the same PTRS-RE-offset parameter (for example, by RRC), the two or more 512 UEs can still be programmed with a single layer, each when scheduling MU-MIMO (for example, DM-RS 1000 and 1001 ports, respectively), as it is guaranteed that each DM-RS port maps the PT-RS to an exclusive subcarrier.
[00213] [00213] Below Table 7 and Table 8, the offsetp value for different DM-RS ports for DM-RS configuration types 1 and 2, respectively, are shown. Based on the previous tables and the function in Eq. 2 to generate the relative index. An implementation of the second variant is shown in Table 9 and Table 10 below, which describe the encoding of PTRS-RE-offset and the corresponding PT-RS subcarrier for DM-RS ports in DM-RS configuration types 1 and 2 , respectively.
[00214] [00214] An example to implement the second variant below. If the PT-RS port is associated with the DM-RS 1000 port (with S1000 = {0, 2, 4, 6, 8, 10} and offset1000 = 0) and PTRS-RE-offset = 2, PT-RS is mapped to the S1000 subcarrier (2 ∙ 2 + 0) = 8.
[00215] [00215] Table 7 below indicates the offsetp as a function of the DM-RS p port. Without limitation, DM-RS configuration type 1 is assumed in Table 7. DM-RS p port, offsetp 1000 0 1001 1 1002 0 1003 1
[00216] [00216] Table 8 below indicates the offsetp as a function of the DM-RS p port. Without limitation, DM-RS configuration type 2 is assumed in Table
[00217] [00217] An implementation of the second variant is shown in Table 9 below. The subcarrier for PT-RS is derived from a combination of the indication in the bit field and the DM-RS p port, that is, the offsetp. Table 9 can be implemented as a mechanism to encode and decode the “PTRS-RE-offset” Without limitation, Table 9 below assumes DM-RS configuration type 1 and a single symbol DM-RS. The inspection in Table 9 shows that each DM-RS port maps the PT-RS to a single subcarrier. PTRS-RE-offset, by subcarrier index for PT-RS example, according to Port 1000 of Port 1001 of Port 1002 of Port 1003 of signaled by RRC DM-RS DM-RS DM-RS DM-RS 00 0 2 1 3 01 4 6 5 7 10 8 10 9 11
[00218] [00218] An additional implementation of the second variant, combinable with the previous implementation, is shown in Table 10 below. The subcarrier for PT-RS is derived from a combination of the indication in the bit field and the DM-RS p port, that is, the offsetp. Table 10 below applies to the DM-RS configuration type with the smallest subsets. Therefore, the MSB in the bit field is ignored.
[00219] [00219] Table 10 below can be implemented as a mechanism to encode and decode the “PTRS-RE-offset”. Without limitation, Table 10 assumes the DM-RS type 2 configuration and a DM-RS symbol. The inspection in Table 10 shows that each DM-RS port maps the PT-RS to a single subcarrier. PTRS-RE-offset, Index of subcarriers for PT-RS for example, Port 1000 Port 1001 of Port 1002 Port 1003 Port 1004 Port 1005 signaled by DM-RS DM-RS DM-RS DM-RS DM-RS of DM-RS
[00220] [00220] The implementation of the second variant can reduce the necessary overhead to 2 bits. In addition, a common indication for DL and UL can be used, as the second variant allows the use of any value of the “PTRS-RE-offset” parameter with any DM-RS port. In addition, in the case of SU-MIMO with more than one PT-RS being programmed, a single PTRS-RE-offset indication (for example, a single bit field transmission) may provide different subcarriers for associated PT-RS ports to different DM-RS ports, thus reducing overhead compared to the existing use of displacement.
[00221] [00221] To have harmonized signaling for the DM-RS 1 and 2 configuration types, for the DM-RS type 2 configuration, only the 1 LSB (for example, the least significant 1 bit) of PTRS-RE-offset is used to generate the relative index. As a result, a value for the PTRS-RE-offset parameter (ie the bit field) can be used or applied to DM-RS configuration types 1 and 2, for example, without the need to signal the PTRS again -RE-offset when changing the type of DM-RS configuration used in the transmission.
[00222] [00222] For clarity and without limitation, the above modalities and variants have been described for DM-RS ports that do not apply time domain coding. The following implementation provides the index with reduced flexibility with DM-RS ports that apply encryption
[00223] [00223] To make PTRS-RE-offset signaling compatible with cases where TD-OCC applied to DM-RS in conjunction with PT-RS is used (ie ports 1004-1007 for DM-RS type 1 and ports 1006-1011 for DM-RS type 2 for sub-6 scenarios), an additional function f is provided to determine the relative index. The function can be implemented to generate the relative index, as described in the second variant for DM-RS ports without TD-OCC. That is, the following implementation may be compatible with the second variant above for the appropriate DM-RS ports.
[00224] [00224] An exemplary function for DM-RS type 1 is f (PTRS-RE-offset, p) = PTRS-RE-offset + FD_offsetp + 2 ∙ TD_offsetp mod 6, (Eq. 3- 1) where FD_offsetp is a parameter related to the values of the OCC frequency domain (FD-OCC) used by the DM-RS p port. The TD_offsetp parameter is related to the TD-OCC values used by the DM-RS p port. Therefore, the relative index also depends dynamically on the DM-RS port (s) selected for scheduling.
[00225] [00225] More specifically, and without limitation: FD_offsetp = p mod 2, and TD_offsetp =.
[00226] [00226] In tables 11 and 12 below, a PTRS-RE-offset encoding, that is, the bit field, using the scheme shown, is shown.
[00227] [00227] An exemplary function for DM-RS type 2 is f (PTRS-RE-offset, p) = PTRS-RE-offset + FD_offsetp + 2 ∙ TD_offsetp mod 4, (Eq. 3- 2)
[00228] [00228] A similar definition of FD_offsetp and TD_offsetp can be applied, for example, FD_offsetp = p mod 2, and TD_offsetp =.
[00229] [00229] Therefore, the relative index, generated by function f, also depends dynamically on one or more DM-RS ports selected for scheduling. In tables 13 and 14 below, the encoding of the bit field, that is, PTRS-RE-offset, using the scheme shown is shown.
[00230] [00230] The diagrams for DM-RS types 1 and 2 offer different PT-RS subcarriers for different DM-RS ports.
[00231] [00231] Below, Table 11 describes a “PTRS-RE-offset” coding for type 1 DM-RS configuration, assuming 2 DM-RS symbols for ports 1000 to 1003. It can be seen that each DM- RS maps the PT-RS to a single subcarrier. Sub-carrier index for PT-RS PTRS-RE-offset Port 1000 Port 1001 Port 1002 Port 1003 per RRC DMRS DMRS DMRS DMRS 00 0 2 1 3 01 2 4 3 5 10 4 6 5 7 11 6 8 7 9
[00232] [00232] Below, Table 12 describes a “PTRS-RE-offset” coding for type 1 DM-RS configuration, assuming a DM-2 symbol for ports 1004 to 1008. It can be seen that each DM port -RS maps the PT-RS to a single subcarrier. Sub-carrier index for PT-RS PTRS-RE-offset Port 1004 Port 1005 Port 1006 Port 1007 per RRC DMRS DMRS DMRS DMRS 00 4 6 5 7 01 6 8 7 9 10 8 10 9 11 11 10 0 11 1
[00233] [00233] Below, Table 13 describes an encoding of “PTRS-RE-
[00234] [00234] Below, Table 14 describes a “PTRS-RE-offset” encoding for DM-RS type 2, assuming a DM-RS 2 symbol for ports 1006 to 1011. It can be seen that each DM-RS port maps the PT-RS to a single subcarrier. Sub-carrier index for PT-RS PTRS-RE-offset Port 1006 Port 1007 Port 1008 Port 1009 Port 1010 Port 1011 by RRC DMRS DMRS DMRS DMRS DMRS DMRS DMRS DMRS 00 6 7 8 9 10 11 01 7 0 9 2 11 4 10 0 1 2 3 4 5 11 1 6 3 8 5 10
[00235] [00235] Fig. 10 shows a schematic block diagram for an embodiment of device 100. Device 100 comprises one or more processors 1004 to execute method 300 and memory 1006 coupled to processors 1004. For example, memory 1006 can be coded with instructions that implement at least module 102.
[00236] [00236] The one or more 1004 processors can be a combination of one or more of a microprocessor, controller, microcontroller, central processing unit, digital signal processor, application specific integrated circuit, field programmable port matrix or any other suitable computing device, hardware feature or combination, microcode and / or coded logic operable to provide, alone or in conjunction with other components of device 100, such as memory 1006, base station and / or radio access functionality. For example, one or more 1004 processors can execute instructions stored in memory 1006. This
[00237] [00237] As schematically illustrated in Fig. 10, device 100 can be incorporated by a base station 510, for example, from a RAN. Base station 510 comprises a radio interface 1002 coupled or connected to device 100 for a radio channel with one or more radio devices. Base station 510 or device 100 can communicate via radio interface 1002 with one or more radio devices.
[00238] [00238] In a variant, for example, as illustrated schematically in Fig. 11, the functionality of device 100 is provided by another node (for example, in the RAN or in a main network linked to the RAN). That is, the node executes method 300. The functionality of device 100 is provided by the node to base station 510, for example, through interface 1002 or a dedicated wired or wireless interface.
[00239] [00239] Fig. 12 shows a schematic block diagram for an embodiment of device 200. Device 200 comprises one or more processors 1204 to execute method 400 and memory 1206 coupled to processors 1204. For example, memory 1206 can be coded with instructions that implement at least module 202.
[00240] [00240] The one or more 1204 processors can be a combination of one or more of a microprocessor, controller, microcontroller, central processing unit, digital signal processor, application specific integrated circuit, field programmable port matrix or any other suitable computing device, hardware feature or combination, microcode and / or coded logic operable to provide, alone or in conjunction with other components of device 200, such as memory 1206, radio device
[00241] [00241] As illustrated schematically in Fig. 12, device 200 can be incorporated by a radio device 512, for example, from a RAN. The radio device 512 comprises a radio interface 1202 coupled or connected to the device 200 for a radio channel with one or more radio access nodes. Radio device 512 or device 200 can communicate via radio interface 1202 with one or more radio access nodes.
[00242] [00242] In a variant, for example, as illustrated schematically in Fig. 13, the functionality of device 200 is provided by another node (for example, in the RAN or in a main network linked to the RAN). That is, the node executes method 200. The functionality of device 200 is provided by the node to radio device 512, for example, through interface 1202 or a dedicated wired or wireless interface.
[00243] [00243] As was evident from the description above, the modalities of the technique allow a lower signaling overhead of the control signaling. It does not require independent indication of “PTRS-RE-offset” for DL and UL. Alternatively or in combination, it does not require an independent “PTRS-RE-offset” indication for all PT-RS ports programmed in SU-MIMO.
[00244] [00244] The same or other modalities can avoid programming restrictions, for example, incompatibilities between the PTRS-RE-offset and the programmed DM-RS port.
[00245] [00245] In addition, the orthogonality between the PT-RS ports (ie
[00246] [00246] The configuration message may allow the configuration of the PT-RS, depending on the quality of the oscillators, the frequency of the carrier, the spacing of the OFDM subcarrier and the modulation and coding scheme (MCS) used for transmission.
[00247] [00247] Many advantages of the present invention will be fully understood from the previous description, and it will be apparent that several changes can be made in the shape, construction and arrangement of the units and devices without departing from the scope of the invention and / or without sacrificing all of its benefits. Since the invention can vary in several ways, it will be recognized that the invention should be limited only by the scope of the following claims.
[00248] [00248] In addition, the technique can be implemented, independently or in combination with any mentioned modality, implementation or variant, according to the following description of additional modalities (where the port index “p” can be indicated by “ x ”), including those described as“ proposals ”.
[1] [1] R1-1718750, “Further evaluations on PTRS for CP-OFDM”, Ericsson
[2] [2] R1-1720981, “TRS above-6GHz evaluations”, Ericsson
[3] [3] R1-1716373, “Details on PTRS design”, Ericsson
[4] [4] Chairman’s Notes RAN1 90bis
[5] [5] R1-1714314, “On DL PTRS design”, Ericsson
[6] [6] 3GPP TS 38.211 v1.1.2
[7] [7] R1-1718749, “Further evaluations on DMRS”, Ericsson
[8] [8] R1-1718449, “Remaining details on PTRS design”, Ericsson
[9] [9] R1-1720725, “Further evaluations on PTRS”, Ericsson
[10] [10] R1-1718751, “Further evaluations on PTRS for DFT-S-OFDM”, Ericsson

权利要求:
Claims (24)
[1]
1. Method (300) for transmitting a configuration message to a phase-tracking reference signal, PT-RS, the method being on a radio access node (510), on a radio channel between an access node radio (510) and a radio device (512), the radio channel comprising a plurality of subcarriers (608) in a physical resource block, PRB, (602) a subset of subcarriers (608) in the PRB (602) being allocated to a demodulation reference signal, DM-RS, the method characterized by the fact that it comprises the step of: transmitting (302) the configuration message to the radio device (512), the configuration message comprising a field of bits that is indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608) allocated to DM-RS, where the radio channel is accessed through one or more DM-RS ports , each DM-RS transmission being associated with one or more DM-RS ports, where the subcarrier the (608) allocated to the PT-RS is uniquely determined between the subset of subcarriers (608) allocated to the DM-RS based on a combination of the bit field in the configuration message and a DM-RS port through which the PT- RS is transmitted or received.
[2]
2. Method according to claim 1, characterized by the fact that the bit field comprises n bits that are indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608) allocated to the DM-RS, and where a number of the plurality of subcarriers (608) in the PRB (602) is greater than 2n.
[3]
Method according to claim 1 or 2, characterized by the fact that the bit field comprises 2 or 3 bits that are indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608) allocated to DM-RS, the number of the plurality of subcarriers (608) in the PRB (602) being 12.
[4]
Method according to any one of claims 1 to 3, characterized by the fact that the radio access node (510) is configured to access the radio channel through the DM-RS ports for a downlink transmission to the radio device (512), the method further comprising the step of: transmitting (304) the PT-RS through at least one of the DM-RS ports on the subcarrier (608) which is allocated to the PT-RS according to the field between the subset of subcarriers (608) allocated in the DM-RS to the corresponding DM-RS port.
[5]
Method according to any one of claims 1 to 4, characterized in that the subset of subcarriers (608) allocated to the DM-RS depends on the corresponding DM-RS port.
[6]
6. Method according to claim 5, characterized by the fact that the PRB (602) comprises 12 subcarriers (608) given by an index k ∈ {0,…, 11}, and in which the subset of subcarriers (608) allocated to the DM-RS being transmitted through the DM-RS p port is given by {2 ∙ R ∙ m + S ∙ k '+ Δ (p) ∈ {0,…, 11} | k ’∈ {0, 1}, 0 ≤ m <6 / R}, where R = 1, 2 or 3; S = 1 or 2; and an offset Δ (p) depends on the DM-RS p port.
[7]
7. Method according to claim 5 or 6, characterized by the fact that a different DM-RS is transmitted through each of the ports of the DM-RS.
[8]
8. Method according to claim 7, characterized by the fact that DM-RSs transmitted through different DM-RS ports are differentiated by at least one of an orthogonal cover code, OCC, in the frequency domain, FD-OCC , an orthogonal cover code in the time domain, TD-OCC and the subset of subcarriers (608) allocated to the DM-RS.
[9]
Method according to any one of claims 1 to
8, characterized by the fact that the DM-RS transmitted through the DM-RS p-port is subjected to an orthogonal coverage code, OCC, in the time domain, TD-OCC, and is subject to an OCC in the frequency domain , FD- OCC, and where the subcarrier (608) allocated to the PT-RS is determined among the subset of subcarriers allocated to the DM-RS based on a combination of the bit field, a DM-RS port dependency of the TD- OCC and a DM-RS port dependency on the FD-OCC.
[10]
10. Method (400) for receiving a configuration message for a phase tracking reference signal, PT-RS, the method being on a radio device (512), on a radio channel between a radio access node (510) and the radio device (512), the radio channel comprising a plurality of subcarriers (608) in a physical resource block, PRB (602), a subset of the subcarriers (608) in the PRB (602) being allocated for a demodulation reference signal, DM-RS, the method characterized by the fact that it comprises the step of: receiving (402) the configuration message by the radio access node (510), the configuration message comprising a field of bits that is indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608) allocated to the DM-RS, where the radio channel is accessed through one or more DM-RS ports, each DM-RS transmission being associated with one or more DM-RS ports, in which the subcarrier (608 ) allocated to PT-RS is uniquely determined between the subset of subcarriers (608) allocated to DM-RS based on a combination of the bit field in the configuration message and a DM-RS port through which PT-RS is transmitted or received.
[11]
11. Method according to claim 10, characterized by the fact that the bit field comprises n bits that are indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608) allocated to the DM-RS, where a number of the plurality of subcarriers (608) in the PRB (602) is greater than 2n.
[12]
Method according to claim 10 or 11, characterized by the fact that the bit field comprises 2 or 3 bits that are indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608) allocated to the DM-RS, the number of the plurality of subcarriers (608) in the PRB (602) being 12.
[13]
13. Method according to any one of claims 10 to 12, characterized in that the radio access node (510) is configured to access the radio channel through the DM-RS ports for a downlink transmission to the radio device (512), the method further comprising the step of: receiving (404) the PT-RS transmitted through at least one of the DM-RS ports on the subcarrier (608) which is allocated to the PT-RS according to the bit field between the subset of subcarriers (608) allocated in the DM-RS to the corresponding DM-RS port.
[14]
Method according to any one of claims 10 to 13, characterized in that the subset of subcarriers (608) allocated to the DM-RS depends on the corresponding DM-RS port.
[15]
15. Method according to claim 14, characterized by the fact that the PRB (602) comprises 12 subcarriers (608) given by an index k 0 {0,…, 11}, and in which the subset of subcarriers (608) allocated to the DM-RS being transmitted or received through the DM-RS p port is given by {2 ∙ R ∙ m + S ∙ k '+ Δ (p) ∈ {0,…, 11} | k ’∈ {0, 1}, 0 ≤ m <6 / R}, where R = 1, 2 or 3; S = 1 or 2; and an offset Δ (p) depends on the DM-RS p port.
[16]
16. Method according to claim 14 or 15, characterized by the fact that a different DM-RS is transmitted or received through each of the ports of the DM-RS.
[17]
17. Method according to claim 16, characterized by the fact that DM-RSs transmitted through different DM-RS ports are differentiated by at least one of an orthogonal cover code, OCC, in the frequency domain, FD-OCC , an orthogonal cover code in the time domain, TD-OCC and the subset of subcarriers (608) allocated to the DM-RS.
[18]
18. Method according to any one of claims 10 to 17, characterized in that the DM-RS transmitted through the DM-RS p-port is subjected to an orthogonal coverage code, OCC, in the time domain, TD- OCC, and is subject to an OCC in the frequency domain, FD-OCC, and where the subcarrier (608) allocated to PT-RS is determined among the subset of subcarriers allocated to DM-RS based on a combination of the field of bits, a DM-RS port dependency on the TD-OCC and a DM-RS port dependency on the FD-OCC.
[19]
19. Radio access node (510) to transmit a configuration message to a phase-tracking reference signal, PT-RS, on a radio channel between a radio access node (510) and a radio device (512), the radio channel comprising a plurality of subcarriers (608) in a physical resource block, PRB, (602) a subset of the subcarriers (608) in PRB (602) being allocated to a demodulation reference signal, DM-RS, the device (100) characterized by the fact that it is configured to: transmit the configuration message to the radio device (512), the configuration message comprising a bit field that is indicative of at least one subcarrier (608 ) allocated to PT-RS among the subset of subcarriers (608) allocated to DM-RS, in which the radio channel is accessed through one or more DM-RS ports, each DM-RS transmission being associated with one of the one or more DM-RS ports, where the subcarrier (608) allocated to PT-RS is unic determined between the subset of subcarriers (608) allocated to the DM-RS based on a combination of the bit field in the configuration message and a DM-RS port through which the PT-RS is transmitted or received.
[20]
20. Radio access node according to claim 19, characterized in that it is additionally configured to perform the steps as defined in any of claims 2 to 19.
[21]
21. for a phase-tracking reference signal, PT-RS, on a radio channel between a radio access node (510) and a radio device (512), the radio channel comprising a plurality of subcarriers ( 608) in a block of physical resources, PRB, (602) a subset of the subcarriers (608) in PRB (602) being allocated to a demodulation reference signal, DM-RS, the device (200) characterized by the fact that it is configured for: receiving the configuration message by the radio access node (510), the configuration message comprising a bit field that is indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608 ) allocated to the DM-RS, where the radio channel is accessed through one or more DM-RS ports, each DM-RS transmission being associated with one or more DM-RS ports, in which the subcarrier ( 608) allocated to PT-RS is only determined among the subset of subcarriers (608) allocated to DM- RS based on a combination of the bit field in the configuration message and a DM-RS port through which the PT-RS is transmitted or received.
[22]
22. Device according to claim 21, characterized in that it is further configured to carry out any of claims 10 to 18.
[23]
23. Method for transmitting (300) and receiving (400) a configuration message for a phase tracking reference signal, PT-RS, on a radio channel between a radio access node (510) and a monitoring device radio (512), the radio channel comprising a plurality of subcarriers (608) in a physical resource block, PRB (602), a subset of subcarriers (608) in PRB (602) being allocated to a demodulation reference signal , DM-RS, the method characterized by the fact that it comprises the steps of: transmitting (302) the configuration message to the radio device (512), the configuration message comprising a bit field that is indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers (608) allocated to DM-RS; and receiving (402) the configuration message by the radio access node (510), the configuration message comprising the bit field that is indicative of at least one subcarrier (608) allocated to PT-RS among the subset of subcarriers ( 608) allocated to DM-RS, where the radio channel is accessed through one or more DM-RS ports, each DM-RS transmission being associated with one of the one or more DM-RS ports, in which the subcarrier (608) allocated to PT-RS is uniquely determined between the subset of subcarriers (608) allocated to DM-RS based on a combination of the bit field in the configuration message and a DM-RS port through which PT-RS is transmitted or received.
[24]
24. System (100, 200) for transmitting a configuration message to a phase-tracking reference signal, PT-RS, on a radio channel between a radio access node (510) and a radio device (512 ), the system incorporated by a radio access node (510) and a radio device (512), the radio channel comprising a plurality of subcarriers (608) in a physical resource block, PRB, (602) a subset of the subcarriers (608) in the PRB (602) being allocated to a demodulation reference signal, DM-RS, the system (100, 200)
characterized by the fact that it is configured to: transmit the configuration message to the radio device (512), the configuration message comprising a bit field that is indicative of at least one subcarrier (608) allocated to PT-RS among the subset subcarriers (608) allocated to the DM-RS; and receiving the configuration message by the radio access node (510), the configuration message comprising the bit field that is indicative of at least one subcarrier (608) allocated to PT-RS among the allocated subset of subcarriers (608) for DM-RS, where the radio channel is accessed through one or more DM-RS ports, each DM-RS transmission being associated with one or more DM-RS ports, where the subcarrier (608) allocated to the PT-RS is uniquely determined among the subset of subcarriers (608) allocated to the DM-RS based on a combination of the bit field in the configuration message and a DM-RS port through which the PT-RS is transmitted or Received.

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法律状态:
2021-12-07| B350| Update of information on the portal [chapter 15.35 patent gazette]|

优先权:

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申请号 | 申请日 | 专利标题

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US201762587967P| true| 2017-11-17|2017-11-17|

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US62/587,967|2017-11-17|

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PCT/EP2018/081400|WO2019096919A1|2017-11-17|2018-11-15|Technique for configuring a phase tracking reference signal|

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