System and method for uplink frequency selective precoding

Abstract

To provide a system and method for uplink frequency selective precoding.SOLUTION: To provide a system and method for selectively precoding uplink frequencies. Systems and methods for uplink frequency selective precoding are presented. The wireless communication device may receive first signaling from a wireless communication node. The first signaling may include a plurality of pieces of precoding information associated with a plurality of port groups. The wireless communications device may determine the precoded signal according to the multiple pieces of precoding information. A wireless communication device may transmit a signal to a wireless communication node.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates generally to wireless communications, including, but not limited to, systems and methods for selectively precoding uplink (UL) frequencies. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP®), a standards organization, is currently in the process of specifying a new radio interface called 5G New Radio (5G NR) and the Next Generation Packet Core Network (NG-CN or NGC). 5G NR has three main components: the 5G Access Network (5G-AN), the 5G Core Network (5GC), and the User Equipment (UE). To facilitate the enablement of different data services and requirements, the elements of the 5GC, also known as network functions, have been simplified; some of them are software-based and some are hardware-based, so they can be adapted as needed. Summary of the Invention [Means for solving the problem]

[0003] The exemplary embodiments disclosed herein are intended to solve one or more problems presented in the prior art and to provide additional features that will become readily apparent from a review of the following detailed description in conjunction with the accompanying drawings. In accordance with various embodiments, exemplary systems, methods, devices, and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example, and not limitation, and it will be apparent to those skilled in the art upon reading this disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of the present disclosure.

[0004] At least one aspect relates to a system, a method, an apparatus, or a computer-readable medium. A wireless communication device may receive first signaling from a wireless communication node. The first signaling may include a plurality of precoding information associated with a plurality of port groups. The wireless communication device may determine a precoded signal according to the plurality of precoding information. The wireless communication device may transmit the signal to the wireless communication node.

[0005] In some embodiments, the first signaling or the second signaling received by the wireless communication device may include mapping information associating each of the plurality of precoding information with a corresponding one of the plurality of port groups. In particular embodiments, each of the plurality of precoding information may be associated with a corresponding one of the plurality of port groups according to an order. In some embodiments, the first signaling may include a first flag, a codepoint in a field of downlink control information (DCI), a first bit value in a bitmap, or a first matrix element value that indicates whether a first port group of the plurality of port groups is enabled or disabled, or whether a first precoding information of the plurality of precoding information corresponding to the first port group of the plurality of port groups is a matrix having all zero elements. In particular embodiments, when a first port group of the plurality of port groups is disabled, the precoding information corresponding to the first port group may be excluded from signal determination. In some embodiments, the wireless communication device may transmit to the wireless communication node a capability report of the wireless communication device including information including at least one of the number of port groups, the number of ports per port group, the number of horizontal antenna elements on one polarization, the number of vertical antenna elements on one polarization, information regarding the distance between two antenna elements or two port groups, a coherent type, the number of antenna ports for a port group, a combination of one or more port groups, the number of ranks, the number of ranks for a port group, a combination of ranks, a granularity of precoding information, the number of precoding information, the number of subbands, the size of the subbands, or a codebook type.

[0006] In particular embodiments, the signal may include at least one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a demodulation reference signal (DMRS). In some embodiments, the wireless communication device may receive a configuration including at least one of a coherent type, a number of antenna ports, a number of port groups, a number of antenna ports for a port group, a combination of one or more port groups, a number of ranks, a number of ranks for a port group, a combination of ranks, a granularity of precoding information, a number of precoding information, a number of subbands, a size of subbands, or a codebook type. In particular embodiments, the wireless communication device may receive a configuration of a plurality of transmission modes, each transmission mode including at least one of a coherent type, a number of antenna ports, a number of port groups, a number of antenna ports for a port group, a combination of one or more port groups, a number of ranks, a number of ranks for a port group, a combination of ranks, a granularity of precoding information, a number of subbands, a size of subbands, or a codebook type. In some embodiments, the wireless communication device may receive a selection of one of a plurality of transmission modes from the wireless communication node.In some embodiments, the one or more port group combinations are: {1 antenna port, 1 antenna port}, {2 antenna ports}, {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports}, {4 antenna ports}, {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {4 antenna ports, 2 antenna ports}, {3 antenna ports, The antenna ports may include at least one of {two antenna ports, two antenna ports, two antenna ports, two antenna ports}, {two antenna ports, two antenna ports, four antenna ports}, {six antenna ports, two antenna ports}, {one antenna port, one antenna port, one antenna port, one antenna port, one antenna port, one antenna port, one antenna port}, {two antenna ports, two antenna ports, two antenna ports}, {two antenna ports, two antenna ports, four antenna ports}, {six antenna ports, two antenna ports}, {four antenna ports, four antenna ports}, or {eight antenna ports}.

[0007] In particular embodiments, the first signaling may include in-phase information corresponding to one or more of the plurality of port groups. In some embodiments, when at least one of the plurality of port groups is fully coherent, the distance between the two port groups may be an unlimited value or may be K*λ, where λ represents the wavelength and K is a defined value or a value reported in the capability signaling. In particular embodiments, the wireless communication device may transmit precoded signals according to the precoding information via N antenna ports, where N is equal to 1, 2, 4, 6, or 8. When N is 2, the N antenna ports may be formed from a combination of {1 antenna port, 1 antenna port} or {2 antenna ports} port groups. When N is 4, the N antenna ports may be formed from a combination of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports}, or {4 antenna ports} port groups. When N is 6, the N antenna ports can be formed from a port group combination of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {4 antenna ports, 2 antenna ports}, {3 antenna ports, 3 antenna ports}, or {6 antenna ports}. When N is 8, the N antenna ports can be formed from a port group combination of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports, 2 antenna ports}, {2 antenna ports, 2 antenna ports, 4 antenna ports}, {6 antenna ports, 2 antenna ports}, {4 antenna ports, 4 antenna ports}, or {8 antenna ports}.

[0008] In some embodiments, when N is 8, the N antenna ports can be in an (N1,N2) configuration, which is a (1,4), (2,2), or (4,1) configuration, where N1 indicates the number of horizontal antenna elements on one polarization and N2 indicates the number of vertical antenna elements on one polarization. In particular embodiments, the rank may be the same across all subbands or resources corresponding to the signal. In some embodiments, the rank and precoding information for each of the port groups may be jointly encoded in a field of the second signaling. In particular embodiments, the maximum value of the rank may be configured per port group or per bandwidth portion (BWP). In some embodiments, one or more of the port groups may be associated with a corresponding uplink codeword. In some embodiments, the plurality of precoding information may include a differential transmit precoding matrix index (TPMI) for each layer or subband. In particular embodiments, the wireless communication device may determine the first precoding information for the first subband using a Mod function. In some embodiments, the Mod function may be implemented per layer. In a particular embodiment, the wireless communication device may receive second signaling from the wireless communication node. The second signaling may include multiple parameter configurations for some or all subbands. The wireless communication device may receive first signaling or third signaling from the wireless communication node. The third signaling may indicate a first parameter configuration of the multiple parameter configurations.

[0009] In some embodiments, each of the plurality of precoding information may include at least one of a precoding group indication, a precoding indication, or a coherence indication. In particular embodiments, the precoding indication may be for all subbands or signals, and the coherence indication may be for a corresponding one of the subbands. The precoding group indication may be for all subbands or signals, the precoding indication is from a designated precoding group, and the coherence indication is for a corresponding one of the subbands. The precoding group indication and the precoding indication from a designated precoding group may be for all subbands or signals, and the coherence indication may be for a corresponding one of the subbands. In particular embodiments, the precoding matrix may be common to any polarization or layer of any of the port groups, and the coherence may be specific to each polarization or layer. In some embodiments, the precoding matrix may be specific to a corresponding port group, and the coherence may be specific to a polarization or layer of the corresponding port group. In particular embodiments, the coherence for one of the port groups may be indicated on a subband-by-subband basis. In some embodiments, the coefficient between two of the port groups may be 0 or may be indicated per subband. In particular embodiments, one of the plurality of precoding information may correspond to a subband. In some embodiments, the wireless communication device may receive first signaling or second signaling from the wireless communication node. The second signaling may include at least one of: a single modulation and coding scheme (MCS) per codeword or transmission block; a rank indicator (RI) or number of layers per port group; a field providing RI and precoding information for the first subband, where the RI applies to all other subbands; or a field providing precoding information and the same RI for all other subbands; the number of precoding information; the number of subbands; the size of the subband; or the granularity of the precoding information.In certain embodiments, at least one of the size of the subband or the granularity of the precoding information may be determined according to a configuration parameter related to the granularity of the precoding information, the number of resource blocks (RBs) corresponding to the signal, the index of the starting RB corresponding to the signal, the number of subbands, the subcarrier spacing (SCS), the total number of resource blocks for a component carrier (CC) or bandwidth portion (BWP), the index of the starting RB corresponding to the CC or BWP, the total number of SRS resources, or the number of SRS ports or antenna ports.

[0010] In some embodiments, a Mod function may be implemented to determine the size of the first or last subband of the signal. In particular embodiments, a floor function may be implemented to determine the size of each subband of the signal. In particular embodiments, a subcarrier spacing (SRS) port or number of antenna ports may be greater than or equal to a first threshold. In some embodiments, a number of resource blocks (RBs) for a transmission, or a bandwidth portion (BWP) or component carrier (CC) carrying the transmission may be greater than or equal to a second threshold. In particular embodiments, a rank or number of layers for a transmission may be greater than or equal to a third threshold. In some embodiments, candidate values ​​for at least one of a granularity of precoding information, a number of precoding information, a number of subbands, or a subband size may be reported as a user equipment (UE) capability. In particular embodiments, a wireless communication device may receive second signaling from a wireless communication node. The second signaling may include one or more granularities of the precoding information. The wireless communication device may receive third signaling from the wireless communication node. The third signaling may indicate a first granularity of the one or more granularities. In some embodiments, the wireless communication device may receive second signaling from the wireless communication node. The second signaling may include at least one of a modulation and coding scheme (MCS), a rank indicator (RI), or precoding information for all subbands or signals. The wireless communication device may receive the first signaling or third signaling from the wireless communication node. The third signaling may include precoding information for the first subband.

[0011] In some embodiments, at least two of the first signaling, the second signaling, or the third signaling may have the same Hybrid Automatic Request (HARQ) process number. In particular embodiments, the search space of the second signaling may be associated with the search space of the first signaling or the third signaling. In some embodiments, the HARQ process number field of the first signaling, the second signaling, or the third signaling may be set to a particular value. In particular embodiments, the redundancy version field of the first signaling, the second signaling, or the third signaling may be set to a particular value. In some embodiments, the modulation and coding scheme (MCS) field of the first signaling, the second signaling, or the third signaling may be set to a particular value. In certain embodiments, the frequency domain resource allocation field of the first signaling, the second signaling, or the third signaling may be set to a particular value. In some embodiments, the uplink or downlink shared channel indicator field of the first signaling, the second signaling, or the third signaling may be set to a particular value.

[0012] At least one aspect relates to a system, a method, an apparatus, or a computer-readable medium. A wireless communication node (e.g., a terrestrial terminal, a base station, a gNB, an eNB, or a serving node) may transmit first signaling to a wireless communication device. The first signaling may include a plurality of precoding information associated with a plurality of port groups. The wireless communication node may receive a signal from the wireless communication device that has been precoded by the wireless communication device. The signal may be precoded by the wireless communication device according to the plurality of precoding information.

[0013] This disclosure describes an uplink frequency-selective precoding technique for enabling efficient uplink (UL) transmission. Specifically, the systems and methods presented herein consider one or more types of antenna architectures for wireless communication devices (e.g., UEs), including 2Tx / 4Tx / 6Tx / 8Tx, non-coherent / partially coherent / fully coherent, and / or mixed cases of uniform spatial / randomly distributed architectures. To provide a unified solution for the above architectures (essential for standardization and / or real-time deployment), a port-group-based solution is described herein. Furthermore, a flexible signaling design for frequency-selective precoding is discussed, which can balance UL transmission performance and / or DCI overhead. The present invention provides, for example, the following. (Item 1) 1. A method, comprising: receiving, by a wireless communication device, first signaling from a wireless communication node, the first signaling including a plurality of precoding information associated with a plurality of port groups; determining, by the wireless communication device, a precoded signal according to the plurality of precoding information; transmitting, by the wireless communication device, the signal to the wireless communication node; A method comprising: (Item 2) Item 10. The method of claim 1, wherein the first signaling or the second signaling received by the wireless communication device includes mapping information that associates each of the plurality of precoding information with a corresponding one of the plurality of port groups. (Item 3) Item 10. The method according to item 1, wherein each of the plurality of pieces of precoding information is associated with a corresponding one of the plurality of port groups in order. (Item 4) Item 1. The method of item 1, wherein the first signaling includes a first flag, a codepoint in a field of downlink control information (DCI), a first bit value in a bitmap, or a first matrix element value, which indicates whether a first port group among the plurality of port groups is enabled or disabled, or whether first precoding information among the plurality of precoding information corresponding to the first port group among the plurality of port groups is a matrix having all zero elements. (Item 5) Item 5. The method of item 4, wherein when the first port group of the plurality of port groups is disabled, the precoding information corresponding to the first port group is excluded from the determination of the signal. (Item 6) Item 10. The method of claim 1, further comprising transmitting, by the wireless communication device to the wireless communication node, a capability report of the wireless communication device, wherein the capability report of the wireless communication device includes information including at least one of the following: number of port groups, number of ports per port group, number of horizontal antenna elements on one polarization, number of vertical antenna elements on one polarization, information regarding the distance between two antenna elements or two port groups, coherence type, number of antenna ports for a port group, combination of one or more port groups, number of ranks, number of ranks for a port group, combination of ranks, granularity of precoding information, number of precoding information, number of subbands, size of subbands, or codebook type. (Item 7) Item 1, wherein the signal includes at least one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a demodulation reference signal (DMRS). (Item 8) Item 10. The method of item 1, comprising receiving, by the wireless communication device, a configuration, wherein the configuration includes at least one of a coherent type, a number of antenna ports, a number of port groups, a number of antenna ports for a port group, a combination of one or more port groups, a number of ranks, a number of ranks for a port group, a combination of ranks, a granularity of precoding information, a number of precoding information, a number of subbands, a size of a subband, or a codebook type. (Item 9) receiving, by the wireless communication device, a configuration of a plurality of transmission modes, each transmission mode including at least one of a coherence type, a number of antenna ports, a number of port groups, a number of antenna ports for a port group, a combination of one or more port groups, a number of ranks, a number of ranks for a port group, a combination of ranks, a granularity of precoding information, a number of precoding information, a number of subbands, a subband size, or a codebook type; receiving, by the wireless communication device, a selection of one of the plurality of transmission modes from the wireless communication node; Item 1. The method according to item 1, comprising: (Item 10) The combination of one or more port groups may be {1 antenna port, 1 antenna port}, {2 antenna ports}, {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports}, {4 antenna ports}, {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {4 antenna ports, 2 antenna ports}, {3 antenna ports, 3 10. The method of claim 8 or 9, comprising at least one of {6 antenna ports}, {6 antenna ports}, {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {2 antenna ports, 2 antenna ports, 4 antenna ports}, {6 antenna ports, 2 antenna ports}, {4 antenna ports, 4 antenna ports}, or {8 antenna ports}. (Item 11) Item 10. The method of claim 1, wherein the first signaling includes in-phase information corresponding to one or more of the plurality of port groups. (Item 12) Item 1. The method of claim 1, wherein when at least one of the multiple port groups is fully coherent, the distance between two port groups is an unlimited value or is K*λ, where λ represents the wavelength and K is a defined value or a value reported in capability signaling. (Item 13) transmitting, by the wireless communication device, the signal precoded according to the precoding information via N antenna ports, where N is equal to 1, 2, 4, 6, or 8; When N is 2, the N antenna ports are formed from a combination of port groups of {1 antenna port, 1 antenna port} or {2 antenna ports}; When N is 4, the N antenna ports are formed from a combination of port groups of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports}, or {4 antenna ports}; If N is 6, the N antenna ports are formed from a port group combination of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {4 antenna ports, 2 antenna ports}, {3 antenna ports, 3 antenna ports}, or {6 antenna ports}; or Item 1. The method of item 1, wherein when N is 8, the N antenna ports are formed from a port group combination of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {2 antenna ports, 2 antenna ports, 4 antenna ports}, {6 antenna ports, 2 antenna ports}, {4 antenna ports, 4 antenna ports}, or {8 antenna ports}. (Item 14) Item 14. The method of item 13, wherein when N is 8, the N antenna ports are in an (N1,N2) configuration, which is a (1,4), (2,2) or (4,1) configuration, where N1 indicates the number of horizontal antenna elements on one polarization and N2 indicates the number of vertical antenna elements on one polarization. (Item 15) the rank is the same across all subbands or resources corresponding to said signal; The rank and precoding information of each of the port groups are jointly encoded in a field of the second signaling; The maximum rank is configured per port group or per bandwidth portion (BWP); or one or more of the port groups are associated with a corresponding uplink codeword; Item 14. The method according to item 13, wherein the method is at least one of the following: (Item 16) Item 1. The method according to item 1, wherein the plurality of precoding information includes a differential transmit precoding matrix index (TPMI) for each layer or subband. (Item 17) Item 10. The method of item 1, comprising determining, by the wireless communication device, first precoding information for a first subband using a Mod function. (Item 18) Item 18. The method according to item 17, wherein the Mod function is performed layer by layer. (Item 19) receiving, by the wireless communication device, second signaling from the wireless communication node, the second signaling including a plurality of parameter configurations for some or all subbands; receiving, by the wireless communication device, from the wireless communication node, the first signaling or third signaling indicating a first parameter configuration of the plurality of parameter configurations; Item 1. The method according to item 1, comprising: (Item 20) each of the plurality of precoding information includes at least one of a precoding group indication, a precoding indication, or an in-phase indication; The precoding indication is for all subbands or the signal, and the in-phase indication is for a corresponding one of the subbands; The precoding group indication is for all subbands or the signal, the precoding indication is the precoding indication from an indicated precoding group, and the in-phase indication is for a corresponding one of the subbands; or The precoding group indication and the precoding indication from the indicated precoding group relate to all subbands or the signal, and the in-phase indication relates to a corresponding one of the subbands; Item 1. The method according to item 1, wherein the method is at least one of the following: (Item 21) The precoding matrix is ​​common to any polarization or layer of any of the port groups, and the common phase is specific to each polarization or layer, or The precoding matrix is ​​specific to a corresponding port group, and the in-phase is specific to the polarization or layer of the corresponding port group, or the in-phase for one of the port groups is indicated per subband, or Item 10. The method of claim 1, wherein the coefficient between two of the port groups is 0 or indicated per subband. (Item 22) Item 1. The method of item 1, wherein one of the plurality of precoding information corresponds to a subband. (Item 23) receiving, by the wireless communication device, the first signaling or the second signaling from the wireless communication node; The second signaling comprises: A single modulation coding scheme (MCS) per codeword or transmission block; Rank Indicator (RI) or tier count per port group, a field providing RI and precoding information for a first subband, the RI being applied to all other subbands, or a field providing the same RI and precoding information for all other subbands; the number of precoding information the number of subbands, the size of the subband, or Granularity of precoding information 23. The method according to item 22, comprising at least one of the following: (Item 24) At least one of a size of a subband or a size of a granularity of precoding information is determined according to a configuration parameter; Item 23. The method according to item 22, wherein the configuration parameters are related to the granularity of precoding information, the number of resource blocks (RBs) corresponding to the signal, the index of a starting RB corresponding to the signal, the number of subbands, a subcarrier spacing (SCS), the total number of resource blocks for a component carrier (CC) or a bandwidth portion (BWP), the index of a starting RB corresponding to the CC or the BWP, the total number of SRS resources, or the number of SRS ports or antenna ports. (Item 25) A Mod function is performed to determine the size of the first or last subband of the signal; or A floor function is implemented to determine the size of each subband of the signal; 23. The method according to item 22, wherein the method is at least one of the following: (Item 26) The number of subcarrier spacing (SRS) ports or antenna ports is greater than or equal to a first threshold; The number of resource blocks (RBs) for a transmission, or the bandwidth portion (BWP) or component carrier (CC) carrying said transmission, is greater than or equal to a second threshold; or the number of ranks or layers for said transmission is equal to or greater than a third threshold; 23. The method according to item 22, wherein the method is at least one of the following: (Item 27) Item 23. The method of item 22, wherein at least one candidate value of the granularity of the precoding information, the number of precoding information, the number of subbands, or the size of the subbands is reported as a user equipment (UE) capability. (Item 28) receiving, by the wireless communication device, second signaling from the wireless communication node, the second signaling including one or more granularities of precoding information; receiving, by the wireless communication device, third signaling from the wireless communication node indicating a first granularity of the one or more granularities; Item 1. The method according to item 1, comprising: (Item 29) receiving, by the wireless communication device, second signaling from the wireless communication node, the second signaling including at least one of a modulation and coding scheme (MCS), a rank indicator (RI), or precoding information for all subbands or the signal; receiving, by the wireless communication device, from the wireless communication node, the first signaling or third signaling including precoding information for a first subband; Item 1. The method according to item 1, comprising: (Item 30) at least two of the first signaling, the second signaling, or the third signaling have the same Hybrid Automatic Request (HARQ) process number; the search space of the second signaling is associated with the search space of the first signaling or the third signaling; A HARQ process number field of the first signaling, the second signaling, or the third signaling is set to a particular value: a redundancy version field of the first signaling, the second signaling, or the third signaling is set to a particular value; a modulation and coding scheme (MCS) field of the first signaling, the second signaling, or the third signaling is set to a particular value; a frequency domain resource allocation field of the first signaling, the second signaling, or the third signaling is set to a specific value; or an uplink or downlink shared channel indicator field of the first signaling, the second signaling, or the third signaling is set to a particular value; 30. The method according to item 29, comprising at least one of the following: (Item 31) 1. A method, comprising: transmitting, by the wireless communication node, to the wireless communication device, first signaling including a plurality of precoding information associated with a plurality of port groups; receiving, by the wireless communication node, from the wireless communication device, a signal precoded by the wireless communication device according to the plurality of precoding information; A method comprising: (Item 32) 32. A non-transitory computer-readable medium storing instructions that, when executed by at least one processor, cause the at least one processor to perform the method of any one of items 1 to 31. (Item 33) 32. An apparatus comprising at least one processor configured to perform the method of any one of items 1 to 31. [Brief explanation of the drawings]

[0014] Various exemplary embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for illustrative purposes only and merely depict exemplary embodiments of the present solution to facilitate the reader's understanding of the present solution. Therefore, the drawings should not be considered as limiting the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, the drawings are not necessarily drawn to scale.

[0015] [Figure 1] FIG. 1 illustrates an exemplary cellular communication network in which the techniques disclosed herein may be implemented according to embodiments of the present disclosure.

[0016] [Figure 2] FIG. 2 illustrates a block diagram of an example base station and user equipment device in accordance with some embodiments of the present disclosure.

[0017] [Figure 3] FIG. 3 illustrates an example approach for beam-based uplink (UL) and / or downlink (DL) transmission according to some embodiments of the present disclosure.

[0018] [Figure 4] 4-5 show examples of precoding matrices W for single-layer and / or two-layer transmission according to some embodiments of the present disclosure. [Figure 5] 4-5 show examples of precoding matrices W for single-layer and / or two-layer transmission according to some embodiments of the present disclosure.

[0019] [Figure 6] 6-10 illustrate example configurations of antenna architectures for wireless communication devices according to some embodiments of the present disclosure. [Figure 7] 6-10 illustrate example configurations of antenna architectures for wireless communication devices according to some embodiments of the present disclosure. [Figure 8] 6-10 illustrate example configurations of antenna architectures for wireless communication devices according to some embodiments of the present disclosure. [Figure 9] 6-10 illustrate example configurations of antenna architectures for wireless communication devices according to some embodiments of the present disclosure. [Figure 10] 6-10 illustrate example configurations of antenna architectures for wireless communication devices according to some embodiments of the present disclosure.

[0020] [Figure 11] FIG. 11 illustrates an example of a technique for shifting precoding information for a subband according to some embodiments of this disclosure.

[0021] [Figure 12] FIG. 12 illustrates a flow diagram of an exemplary method for selectively precoding UL frequencies according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0022] (1. Mobile Communications Technology and the Environment) 1 illustrates an exemplary wireless communication network and / or system 100 in which the techniques disclosed herein according to embodiments of the present disclosure may be implemented. In the following description, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of Things (NB-IoT) network, and is referred to herein as “network 100.” Such exemplary network 100 includes a base station 102 (hereinafter “BS 102”; also referred to as a wireless communication node) and a user equipment device 104 (hereinafter “UE 104”; also referred to as a wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel), and clusters of cells 126, 130, 132, 134, 136, 138, and 140 that overlap a geographic region 101. In FIG. 1, the BS 102 and the UE 104 are contained within respective geographic boundaries of the cell 126. Each of the other cells 130, 132, 134, 136, 138, and 140 may include at least one base station operating in its assigned bandwidth to provide adequate wireless coverage to intended users.

[0023] For example, the BS 102 may operate within an assigned channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink radio frame 118 and an uplink radio frame 124, respectively. Each radio frame 118 / 124 may be further divided into subframes 120 / 127, which may include data symbols 122 / 128. In this disclosure, the BS 102 and the UE 104 are generally described herein as non-limiting examples of “communication nodes” capable of practicing the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communication in accordance with various embodiments of the present solution.

[0024] 2 illustrates a block diagram of an exemplary wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) in accordance with some embodiments of the present solution. System 200 may include components and elements configured to support known or conventional operational features that need not be described in detail herein. In one exemplary embodiment, system 200 may be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment, such as wireless communication environment 100 of FIG. 1, as described above.

[0025] The system 200 generally includes a base station 202 (hereinafter "BS 202") and a user equipment device 204 (hereinafter "UE 204"). The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each of which is coupled and interconnected as needed via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each of which is coupled and interconnected as needed via a data communication bus 240. The BS 202 communicates with the UE 204 over a communication channel 250, which can be any wireless channel or other medium suitable for the transmission of data as described herein.

[0026] As will be appreciated by those skilled in the art, system 200 may further include any number of modules other than those illustrated in FIG. 2 . Those skilled in the art will appreciate that the various exemplary blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, the various exemplary components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software may depend on the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a manner suitable for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.

[0027] According to some embodiments, the UE transceiver 230 may be referred to herein as an “uplink” transceiver 230 that includes a radio frequency (RF) transmitter and an RF receiver, each including circuitry coupled to an antenna 232. Alternatively, a duplexing switch (not shown) may couple the uplink transmitter or receiver to the uplink antenna in a time-duplexed manner. Similarly, according to some embodiments, the BS transceiver 210 may be referred to herein as a “downlink” transceiver 210 that includes an RF transmitter and an RF receiver, each including circuitry coupled to an antenna 212. Alternatively, a downlink duplexing switch may couple the downlink transmitter or receiver to the downlink antenna 212 in a time-duplexed manner. The operation of the two transceiver modules 210 and 230 may be coordinated in time such that the downlink transmitter is coupled to the downlink antenna 212 at the same time that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250. Conversely, the operation of the two transceivers 210 and 230 may be coordinated in time such that the uplink transmitter is coupled to the uplink antenna 232 at the same time that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250. In some embodiments, there is a truncated time synchronization with a minimum guard time between changes in duplex direction.

[0028] The UE transceiver 230 and the base station transceiver 210 are configured to communicate over a wireless data communication link 250 and cooperate with appropriately configured RF antenna devices 212 / 232 capable of supporting a particular wireless communication protocol and modulation scheme. In some exemplary embodiments, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as Long Term Evolution (LTE) and emerging 5G standards. However, it will be understood that the present disclosure is not necessarily limited to application to a particular standard and associated protocol. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternative or additional wireless data communication protocols, including future standards or variants thereof.

[0029] According to various embodiments, the BS 202 may be, for example, an evolved Node B (eNB), a serving eNB, a target eNB, a femto station, or a pico station. In some embodiments, the UE 204 may be embodied in various types of user devices, such as a mobile phone, a smartphone, a personal digital assistant (PDA), a tablet, a laptop computer, a wearable computing device, etc. The processor modules 214 and 236 may be implemented or realized using a general-purpose processor, a content-addressable memory, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. In this manner, the processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, etc. The processor may also be implemented as a combination of computing devices, such as a combination of a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a digital signal processor core, or any other such configuration.

[0030] Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, firmware, software modules executed by processor modules 214 and 236, respectively, or any practical combination thereof. Memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to processor modules 210 and 230, respectively, such that processor modules 210 and 230 can read information from and write information to memory modules 216 and 234, respectively. Memory modules 216 and 234 may be integrated into their respective processor modules 210 and 230. In some embodiments, memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions executed by processor modules 210 and 230, respectively. Each of the memory modules 216 and 234 may also include non-volatile memory for storing instructions executed by the processor modules 210 and 230, respectively.

[0031] The network communications module 218 generally represents the hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bidirectional communications between the base station transceiver 210 and other network components and communication nodes configured to communicate with the base station 202. For example, the network communications module 218 may be configured to support Internet or WiMAX traffic. In a typical deployment, without limitation, the network communications module 218 provides an 802.3 Ethernet interface to enable the base station transceiver 210 to communicate with conventional Ethernet-based computer networks. In this manner, the network communications module 218 may include a physical interface for connecting to a computer network (e.g., a mobile switching center (MSC)). As used herein with respect to a specified operation or function, the terms “configured for,” “configured to,” and their conjugations refer to a device, component, circuit, structure, machine, signal, etc. that is physically configured, programmed, formatted, and / or arranged to perform the specified operation or function.

[0032] The Open Systems Interconnection (OSI) model (referred to herein as the "Open Systems Interconnection Model") is a conceptual and logical layout that defines network communications used by open systems (e.g., wireless communication devices, wireless communication nodes) to interconnect and communicate with other systems. The model is divided into seven subcomponents or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI model also defines logical networks and effectively describes computer packet transfers by using different layer protocols. The OSI model may also be referred to as the seven-layer OSI model or seven-layer model. In some embodiments, the first layer may be the physical layer. In some embodiments, the second layer may be the medium access control (MAC) layer. In some embodiments, the third layer may be the radio link control (RLC) layer. In some embodiments, the fourth layer may be the packet data convergence protocol (PDCP) layer. In some embodiments, the fifth layer may be the radio resource control (RRC) layer. In some embodiments, the sixth layer may be a non-access stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer is another layer.

[0033] To enable those skilled in the art to make and use the present solution, various exemplary embodiments of the present solution are described below with reference to the accompanying drawings. As will be apparent to those skilled in the art, after reading this disclosure, various modifications or variations can be made to the examples described herein without departing from the scope of the present solution. Thus, the present solution is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, any specific order or hierarchy of steps in the methods disclosed herein is merely an example approach. Based on design preferences, the specific order or hierarchy of steps in a disclosed method or process can be rearranged while remaining within the scope of the present solution. Thus, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or operations in a sample order, and that the present solution is not limited to the specific order or hierarchy presented, unless otherwise specified. 2. Systems and Methods for Uplink Frequency Selective Precoding

[0034] In certain systems (e.g., 5G new radio (NR), Next Generation (NG) systems, 3GPP systems, and / or other systems), transmissions (e.g., uplink (UL) multiple-input multiple-output (MIMO) transmissions) may use (e.g., be based on) wideband transmit precoding information (e.g., a single transmit precoding matrix indicator (TPMI) applied to the UL transmission bandwidth) to save / reduce overhead associated with downlink control information (DCI) signaling. In particular embodiments, the maximum number of transmit (Tx) antennas of a wireless communication device (e.g., a UE, terminal, or served node) may include or correspond to four Tx antennas (or other number of antennas). However, particularly in scenarios involving wideband UL transmissions using multiple Tx antennas (e.g., four or more antennas), degradation of the UL performance of the wireless communication device (e.g., due to wideband precoding) cannot be ignored. Using multiple Tx antennas to perform wideband UL transmissions may be an emerging performance enhancement in some systems (e.g., 5G-Advanced, 6G systems, NG systems, and / or other systems), and performing the wideband UL transmissions may increase the throughput and / or robustness of the systems.

[0035] Therefore, frequency-selective precoding for UL-MIMO transmission (e.g., for 4, 6, and / or 8 UE Tx antennas) can be considered in systems that implement wideband UL transmission using multiple Tx antennas. Frequency-selective precoding techniques for UL-MIMO transmission can enhance and / or improve UL precoding from wideband to subband, and certain frequency-selective precoding techniques (e.g., for UL-MIMO transmission) can face / address one or more of the following problems / challenges: 1) To provide efficient frequency-selective precoding, the antenna architecture of the wireless communication device may be considered (e.g., taken into account). The antenna architecture of the wireless communication device may affect / influence the UL precoding codebook design. Therefore, the frequency-selective precoding technique may consider (e.g., take into account) multiple antenna architectures, such as 2Tx / 4Tx / 6Tx / 8Tx architectures, non-coherent / partially coherent / fully coherent architectures, and / or mixed cases of uniform spatial / randomly distributed architectures. 2) The UL precoding codebook may enable the above-mentioned mixed cases (e.g., with respect to the UL codebook physical uplink shared channel (PUSCH0 transmission)). For example, to avoid several independent, separate, and / or distinct solutions for different cases, a unified solution may be considered. Therefore, the systems and methods described herein present and / or discuss a port group-based solution that provides a unified solution. 3) A highly efficient frequency-specific precoding mechanism can be used to increase tolerance for DCI signaling overhead. Particular systems / methods can include / use wideband (WB)-specific parameters and / or subband (SB)-specific parameters (e.g., rank indicator (RI) and TPMI for modulation and coding scheme (MCS)). In some embodiments, flexible indication signaling (e.g., multiple levels) can be used and / or the granularity of frequency-selective precoding can be considered.

[0036] In certain systems, the use of high-frequency resources may induce / create / cause significant propagation loss. Thus, wide-area and / or ultra-wide-area spectrum resources may pose / introduce / cause significant difficulties (e.g., due to propagation loss). Referring now to FIG. 3 , an exemplary approach 300 for beam-based UL and / or DL ​​transmission is shown. One or more beams in FIG. 3 may indicate / designate / represent transmit (Tx) beams and / or receive (Rx) beams selected / identified for transmission. In some embodiments, certain technologies / techniques may achieve / provide beam alignment and / or obtain / provide sufficient antenna gain. For example, antenna arrays and / or beamforming training techniques using massive multiple-input multiple-output (MIMO) (e.g., up to 1024 antenna elements per node) may achieve beam alignment and / or sufficient antenna gain. In some embodiments, analog phase shifters may be used to implement / enable millimeter-wave beamforming (BF). Using analog phase shifters may result in low implementation costs with the benefits of using antenna arrays. When analog phase shifters are used (e.g., to implement millimeter-wave beamforming), the number of controllable phases may be finite / defined / limited. In some embodiments, using analog phase shifters may impose / provide one or more constant modulus constraints on the analog phase shifters. Given a set of one or more pre-specified beam patterns, the goal / target of variable phase-shift-based beamforming (BF) training may correspond to identifying / determining an optimal beam pattern for subsequent data transmission. The identified beam pattern may be applied to one or more scenarios with one transmitting and receiving point (TRP) and / or one panel (e.g., a UE with one panel).

[0037] For a particular Physical Uplink Shared Channel (PUSCH) transmission, the vector

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[0038] A set of antenna ports (e.g., {P0, ,P p-1}) may be determined according to (or based on) one or more sounding reference signal (SRS) ports of one or more SRS resources. The one or more SRS resources may be associated (or related) with a PUSCH transmission. The wireless communication device may transmit, send, broadcast, and / or communicate the PUSCH transmission using an antenna port that is the same / corresponding to the SRS port of the SRS resource associated with the PUSCH transmission. A DCI configuration and / or a radio resource control (RRC) configuration (or other configuration) may provide, specify, and / or indicate the association (e.g., the SRS resource associated with the PUSCH transmission). For non-codebook based transmission, the precoding matrix W may include or correspond to an identity matrix. For codebook-based transmission, the precoding matrix W may include or correspond to W=1 for single-layer transmission on a single antenna port. In certain embodiments, the precoding matrix W may include or correspond to the TPMI. The TPMI may be obtained / acquired from the DCI scheduling the uplink transmission. The precoding matrix W may be wideband in 5G NR (or other systems), so for a given UL transmission, the same precoding (e.g., a single W) may be used for each resource block (RB) or resource element (RE), regardless of the number of REs. The systems and methods of the present disclosure may focus on (or relate to) codebook-based transmission.

[0039] For example, in a wireless communication device having two Tx antenna ports (e.g., 2 Tx antenna ports), the precoding matrix W for single-layer and / or two-layer transmissions can be found in table 400 of FIG. 4 and table 500 of FIG. 5, respectively.

[0040] In some embodiments, a beam state may correspond to / refer to a quasi-collocation (QCL) state, a transmission configuration indicator (TCI) state, a spatial relationship state (or spatial relationship information state), a reference signal (RS), a spatial filter, and / or precoding. In some embodiments, a beam state may correspond to a beam. Specifically: a) A Tx beam may correspond to / refer to a QCL state, a TCI state, a spatial relationship state, a DL / UL reference signal (e.g., a Channel State Information RS (CSI-RS), a Synchronization Signal Block (SSB) or SS / PBCH, a Demodulation Reference Signal (DMRS), a Sounding Reference Signal (SRS), a Physical Random Access Channel (PRACH), and / or other signals), a Tx spatial filter, and / or a Tx precoding. b) The Rx beam may correspond to / refer to a QCL state, a TCI state, a spatial relationship state, a spatial filter, an Rx spatial filter, and / or an Rx precoding. c) The beam identifier (ID) may correspond to / point to a QCL state index, a TCI state index, a spatial relationship state index, a reference signal index, a spatial filter index, a precoding index, and / or other indexes.

[0041] In some embodiments, the spatial filter may correspond to a wireless communication device and / or a wireless communication node aspect. In some embodiments, the spatial filter may refer to a spatial domain filter and / or other filter.

[0042] In some embodiments, the spatial relationship information may include one or more reference RSs. The spatial relationship information may be used to specify / indicate / communicate / represent the same and / or quasi-identical spatial relationship between the target RS / channel and one or more reference RSs. In some embodiments, the spatial relationship may refer to a beam, a spatial parameter, and / or a spatial domain filter.

[0043] In some embodiments, a QCL state may include one or more reference RSs and / or one or more corresponding QCL type parameters. The QCL type parameters may include at least one of Doppler spread, Doppler shift, delay spread, average delay, average gain, and / or spatial parameters. In some embodiments, a TCI state may correspond to / refer to a QCL state. In some embodiments, a QCL type D may correspond to spatial parameters and / or spatial Rx parameters. In some embodiments, the signal may include / include a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a demodulation reference signal (DMRS), a sounding reference signal (SRS), and / or other channels / signals. In particular embodiments, the precoding may correspond to a precoding matrix, a precoding vector, and / or a precoding codebook. In some embodiments, all subbands may correspond to a wideband or signal transmission (e.g., the entire corresponding signal transmission, or the corresponding signal transmission). In some embodiments, parameters for all subbands (e.g., precoding, in-phase, and / or transmission parameters) may correspond to wideband parameters and / or parameters applied to a signal (e.g., the entire transmission of the signal and / or all resources corresponding to the signal transmission).

[0044] In some embodiments, the time unit may include a subsymbol, a symbol, a slot, a subframe, a frame, a transmission opportunity, and / or other time instances. In some embodiments, the power control parameters may include a target power (P), a path loss RS (e.g., a combining loss RS), a path loss scaling factor (e.g., alpha), and / or a closed-loop process. In some embodiments, the DCI may correspond to / refer to a PDCCH. In particular embodiments, the precoding information may include or correspond to a precoding matrix indicator (PMI), a transmit precoding matrix indicator (TPMI), precoding information, and / or beam information. In some embodiments, the port group may include or designate an antenna group and / or a port group of a wireless communication device (e.g., a UE port group). A. Embodiment 1: Architecture of a Wireless Communication Device for Up to Eight Tx Antennas

[0045] In some embodiments, for UL transmissions, a wireless communication node (e.g., gNB) may indicate and / or specify precoding information to a wireless communication device (e.g., to determine UL Tx precoding). Thus, from the perspective of the wireless communication device, the wireless communication node may indicate precoding information (e.g., W) to the wireless communication device by using (or in accordance with) commands / signaling (e.g., RRC commands / signaling, medium access control-control element (MAC-CE) commands / signaling, and / or DCI commands / signaling). Based on the precoding information, a vector

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[0046] With respect to the UL codebook (e.g., one or more candidate matrices corresponding to W), an antenna architecture of the wireless communication device (e.g., a typical UE antenna architecture) may be identified / determined. In one or more figures described herein (e.g., FIGS. 6-10), a box (e.g., a dashed or solid box) may indicate that one or more Tx antennas within the box are coherent (e.g., each antenna pair is either on or off). A wireless communication device with two Tx antennas (e.g., a two-Tx antenna UE) may have at least two candidate architectures. As shown in FIG. 6, the at least two candidate architectures may include a non-coherent architecture and / or a fully coherent architecture. In a fully coherent wireless communication device, the two antenna elements may be cross-polarized (e.g., +45 degrees, -45 degrees). For non-coherent wireless communication devices, the common-phase between two non-coherent antenna elements may be meaningless due to the fact that the wireless communication device may not be able to properly control the common-phase between the two antenna elements (e.g., without proper antenna calibration). In certain embodiments, the common phase between two coherent antenna elements can be appropriately controlled by the wireless communication device. Thus, precoding across the two coherent antenna elements can be used to achieve the desired beamforming to improve the performance of the wireless communication device (e.g., higher spatial diversity and / or multiplexing). ○ From the UL codebook perspective, coefficients for non-coherent ports may be provided to achieve / enable port selection (e.g., via "0" or "1", such as TPMI=0,1 in table 400). A wireless communication device with four Tx antennas (e.g., a 4-Tx antenna UE) may have at least three candidate architectures. As shown in FIG. 7, the at least three candidate architectures may include a non-coherent architecture, a partially coherent architecture, and / or a fully coherent architecture. Compared to a wireless communication device with two Tx antennas, a partially coherent architecture may be further considered. For example, a particular embodiment may include multiple port groups, with ports being coherent within each port group. However, ports from different / separate / distinct port groups may not be coherent. Within a coherent port group, for example, the precoding information may be layer-common (e.g., the same value for different polarizations). Co-phase may be provided separately for each polarization and / or port group. For a fully coherent implementation, the distance between two groups of cross-polarized light may include or correspond to K*λ (and / or other values). In some embodiments, λ may indicate and / or specify a wavelength. In one example, K=0.5 (e.g., distance λ / 2). Therefore, a typical evenly spaced distribution can be accounted for. Therefore, a typical Discrete Fourier Transform (DFT) codebook can be used. In some embodiments, the distance between the two groups may be random (and / or correspond to other values). Thus, the random distance between the two groups may correspond to a distributed antenna architecture (e.g., heterogeneous UEs and / or UE aggregation). In such cases, independent in-phase information may be provided for each group. A wireless communication device with six Tx antennas (e.g., a 6-Tx antenna UE) may have at least three candidate architectures. As shown in Figure 8, the at least three candidate architectures may include a non-coherent architecture, a partially coherent architecture, and / or a fully coherent architecture. Compared to a wireless communication device with four Tx antennas, at least three additional scenarios of a partially coherent architecture may be further considered (e.g., 2+2+2, 4+2, and 3+3 for a 6-Tx antenna UE). For non-coherent wireless communication devices, if the number of layers does not exceed four, port selection can be used and / or some of the antenna ports can be turned off. Therefore, supporting partially coherent and / or coherent wireless communication devices can ensure a certain level of transmission performance of the wireless communication device. To facilitate and / or enable a standardized / uniform solution, Tx port groups of a wireless communication device with coherent ports (e.g., UE TX port groups) can be used. Precoding / codebooks can be provided per port group of the wireless communication device. ·UL codebooks can be dedicated to specific port groups of wireless communication devices. The capability reports of the wireless communication devices and / or the configuration of the wireless communication nodes may determine the sharing of the same precoding information (e.g., port group common precoding information). In some embodiments, a common phase may be provided for each port group. For example, the common phase of a first group may be fixed / set / configured to 1. The wireless communication node may be instructed and / or assigned the common phase of other groups. Further details and / or features can be found in the description of embodiment #2. For partially coherent wireless communication devices, the combinations {2,2,2}, {4,2}, and / or {3,3} may further be considered. For {2,2,2}, for each layer, two ports can be provided with in-phase direction by default. RANK-1 (e.g., rank can indicate the number of layers): 2-Tx out of {A, B, C} can be indicated for one layer. RANK-2: {2-Tx-A, 2-Tx-B} can be used for the first and second tiers, respectively. RANK-3: {2-Tx-A, 2-Tx-B, 2-Tx-C} can be used for the first, second, and third tiers, respectively. RANK-4: {2-Tx-A, 2-Tx-B, 2-Tx-C, 2-Tx-C} can be used for the first, second, third, and fourth tiers, respectively. RANK-5: {2-Tx-A, 2-Tx-B, 2-Tx-B, 2-Tx-C, 2-Tx-C} can be used for the first, second, third, fourth, and fifth tiers, respectively. RANK-6: {2-Tx-A, 2-Tx-A, 2-Tx-B, 2-Tx-B, 2-Tx-C, 2-Tx-C} can be used for the first, second, third, fourth, fifth, and sixth layers, respectively. For {3,3}, a distributed antenna with random phase (eg among coherent antenna elements) can be considered as a typical example. RANK-1: 3-Tx (e.g., 3 Tx antennas) can be used for one tier. RANK-2: {3-Tx-A, 3-Tx-B} can be used for the first and second tiers, respectively. RANK-3: {3-Tx-A 3-Tx-A; 3-Tx-B} can be used for the first, second, and third tiers. RANK-4: {3-Tx-A 3-Tx-A; 3-Tx-B 3-Tx-B} can be used for the first, second, third, and fourth tiers, respectively. ●RANK-5:{3-Tx-A 3-Tx-A 3-Tx-A;3-Tx-B 3-Tx-B} can be used for the first, second, third, fourth, and fifth layers, respectively. ●RANK-6:{3-Tx-A 3-Tx-A 3-Tx-A;3-Tx-B 3-Tx-B 3-Tx-B} can be used for the first, second, third, fourth, fifth, and sixth layers, respectively. For {4,2}, a distributed antenna with random phase (e.g., among coherent antenna elements) can be considered as a starting / initial point. RANK-1: 4-Tx-A / 2-Tx-B can be used for one tier. RANK-2: {4-Tx-A, 2-Tx-B} or {4-Tx-A, 4-Tx-A} can be used for the first and second tiers, respectively. o Therefore, one of the two candidates mentioned above (e.g., {4-Tx-A, 2-Tx-B} or {4-Tx-A, 4-Tx-A}) can be indicated (e.g., {number of port groups + TPMI per port group}). o In some embodiments, each TPMI may contain a "Null" or "Reserved Value" value to close / shutdown / eliminate the corresponding port group. RANK-3: {4-Tx-A, 4-Tx-A, 2-Tx-B} can be used for the first, second, and third tiers, respectively. RANK-4: {4-Tx-A, 4-Tx-A, 4-Tx-A, 2-Tx-B} or {4-Tx-A, 4-Tx-A, 2-Tx-B, 2-Tx-B} can be used for the first, second, third, and fourth tiers, respectively. RANK-5: {4-Tx-A, 4-Tx-A, 4-Tx-A, 2-Tx-B, 2-Tx-B} can be used for the first, second, third, fourth, and fifth tiers, respectively. RANK-6: {4-Tx-A, 4-Tx-A, 4-Tx-A, 4-Tx-A, 2-Tx-B, 2-Tx-B} can be used for the first, second, third, fourth, fifth, and sixth layers, respectively. A wireless communication device with eight Tx antennas (e.g., an 8-Tx antenna UE) may have at least three candidate architectures. As shown in FIG. 9, the at least three candidate architectures may include a non-coherent architecture, a partially coherent architecture, and / or a fully coherent architecture. Compared to a wireless communication device with six Tx antennas, in a fully coherent scenario, 1*4 or 2*2 architectures (e.g., (N1, N2) = (2, 2) or (4, 1)) may be considered. In some embodiments, N1 may indicate and / or correspond to the number of horizontal antenna elements on one polarization. In some embodiments, N2 may indicate and / or specify the number of vertical antenna elements on one polarization. For non-coherent wireless communication devices, if the number of layers does not exceed four, port selection can be used and / or some of the antenna ports can be powered off. For partially coherent wireless communication devices, the combinations {2,2,2,2}, {4,4}, and / or {6,2} can be considered. o With respect to coherent wireless communication devices (discussed above), at least two different / separate / distinct wireless communication device architectures may be considered (e.g., (N1, N2) = (2, 2) or (1, 4)). B. Embodiment 2: Port Group-Based Uplink (UL) Precoding

[0047] In some embodiments, the mapping, relationship, and / or association between one or more antenna ports (or SRS ports) and port groups (e.g., grouping antenna ports into one or more port groups) can be configured / instructed. The mapping / association can be configured by command (e.g., RRC, MAC-CE, and / or DCI signaling) to facilitate a unified solution (e.g., configurable codebook). In certain embodiments, the mapping and / or enabling of port groups can be performed via commands (e.g., a bitmap). For example, a bit in a bitmap can be associated with a port group. Thus, if a bit has a value of 1 (or other value), the port group associated with the bit can be enabled. In some embodiments, precoding information may be provided for each port group according to the following formula, where m indicates the number of port groups: If a port group is disabled, the corresponding precoding W i can be NULL, thus the corresponding column / row vector can be cancelled / deactivated / shutdown.

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[0048] For example, an 8-Tx fully coherent wireless communication device (e.g., N1=4, N2=1) can be reported by the wireless communication device to the wireless communication node (e.g., as shown in FIG. 10). Thus, the wireless communication device can be configured (e.g., using RRC commands and / or other commands) in coherent + partially coherent + non-coherent modes. The partial coherent mode can be configured to mode (2,2). ●In MAC-CE, at least one of {coherent, partially coherent, non-coherent} can be activated. In certain embodiments, the coherent scenario may involve a single port group, and therefore the precoding information may be directed with respect to the single port group (e.g., based on a DFT-based codebook). ○In a partially coherent scenario, There are at least two port groups, each of which can point to four ports with (N1=2, N2=1). Therefore, at least two examples of DCI signaling designs can be considered: ● Case #1: In the DCI, information about enabled port groups (eg, 2 bits) and / or precoding information per group can be indicated. Case #2: The precoding information may include a NULL value to disable the port group. In a particular embodiment, a reserved bit may be indicated in the precoding information field, and the reserved bit may indicate that the port group is disabled. In some embodiments, the RANK information and / or the precoding information can be jointly coded in a field. The RANK of the entire transmission can be equal to the sum of the RANKs per port group. In some embodiments, the maximum number of RANKs can be configured per port group and / or per BWP. o In certain embodiments, a mapping between port groups and UL codewords may facilitate and / or enable UL parameter indication. C. Embodiment 3: Unified Solution for Frequency Selective Precoding

[0049] For frequency-selective precoding, precoding information can be provided per RB set and / or per subband, rather than providing a single precoding information for the entire band. In some embodiments, precoding information can be provided per RB set and / or per subband. However, DCI overhead may become unacceptable / inappropriate. For example, 6 bits may be used for a 4-Tx wireless communication device. If introducing frequency-selective precoding increases the number of subbands to 16 (or other value), 92 bits (or other number of bits) may be required for DCI commands, which may be excessive for DCI commands (e.g., increased DCI overhead). To reduce TPMI overhead, differential TPMI for subband precoding (e.g., per layer and / or per subband) can be introduced / used. The phase / delay corresponding to each TPMI can be further considered. ● To determine the precoding information for a subband, the "Mod" function and / or the same RANK(WB) may be required. For example, an initial precoding information index M can be provided for subband #0. Thus, for subband #i, the precoding information is W floor(i*ステップ+M)modX X can be the total number for a given rank. In some embodiments, "step" can be the step size. An example of such an embodiment can be seen in FIG. 11. For RANK>1, the "Mod" function can be performed layer by layer.

[0050] In some embodiments, the detailed mathematical W of a given port group i, each of which has a uniform spacing (e.g., λ / 2) where coherent, i may be provided and / or used. ●Layer 1:b k1,k2 can define a 2-D DFT codebook with indices k1 and k2. 1,1 and i 1,2 c may indicate beam group indices (e.g., precoding group indices) in the horizontal and vertical domains, respectively. s1 and s2 may specify offsets (e.g., the number of beams per group) in the horizontal and vertical domains, respectively. r,0 can indicate in-phase between different polarizations and layers.

number

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[0051] To save / reduce / reduce overhead, one or more wideband (WB) parameters and / or sub-band (SB) parameters may be considered / determined for a given port group with uniform spacing. ●(Example 1:) ○WB parameters: Beam group selection. ○SB parameters: beam selection from beam group and / or in-phase for each subband. In-phase: differential DFT, or DFT-based, and / or stepping factors (e.g., per candidate beam) ●(Example 2:) ○ WB parameters: beam group selection and / or beam selection from a beam group (e.g. beam selection). ○SB parameters: In-phase for each subband.

[0052] For non-uniform spatial port groups, the precoding may be updated as follows (eg, compared to the uniform spatial port group case): ● (Case #1:) The precoding matrix can be common to port groups. In one example, the same precoding matrix b can be applied to one or more polarizations and layers for a given port group. However, each polarization and / or layer for a given port group may have an independent common phase.

number

number

[0053] In certain embodiments, a coefficient of "0" may be provided for different port groups. For example, one or more combinations of WB and / or SB parameters may be activated by MAC-CE and / or RRC commands, while another combination may be indicated by a DCI command. D. Embodiment 4: Flexible signaling for indicating frequency selective precoding

[0054] To reduce and / or decrease DCI overhead with frequency selective gain, one or more of the following aspects can be selected for enhancement: In some embodiments, a single MCS may be indicated. In particular embodiments, an MCS per codeword (CW) / transmission block (TB) may be indicated (e.g., 2 MCS for 2 CW / TB). Regarding RI: o Separate indications regarding RI and / or number of layers per port group can be used. o Furthermore, the first field may be used to provide precoding information and / or RI for the first subband, which may be applied to the remaining subbands. ●Indication of the granularity of the precoding information (e.g., subband size). o Furthermore, the granularity of the precoding information can be determined according to (or based on) the number of RBs, the subcarrier spacing, the total number of SRS resources, the number of SRS ports, and / or the number of antenna ports. o In certain embodiments, frequency selective precoding may be enabled if at least one of the following conditions is met / satisfied: The number of SRS ports and / or the number of antenna ports is greater than or equal to a threshold. · The number of RBs in the transmission and / or the BWP / CC carrying the transmission is greater than or equal to a threshold. · The RANK and / or number of layers of the transmission is above a threshold (e.g., a transmission with 2 or more layers). o In some embodiments, the capabilities of the wireless communication device may report, specify, and / or indicate potential values ​​for the granularity of the precoding information. In some embodiments, the wireless communication device may configure one or more granularities based on RRC and / or MAC-CE commands, and at least one granularity may be indicated by the DCI and / or MAC-CE. In some embodiments, the granularity may be based on the number of RBs (e.g., 8 and / or 16 RBs) and / or subbands (e.g., half- or quarter-scheduled PRBs). In particular embodiments, the granularity can be based on the entire RBs and / or BWP, regardless of the scheduled RBs. Example 1: The granularity of the size of RBs in a precoding resource block (RB) set (e.g., the granularity of the same precoding information) can be indicated by R. Thus, the precoding RB set may partition and / or divide the "RBs scheduled for a given transmission" or "RBs in a BWP / CC" by R RBs (e.g., R consecutive RBs). The size of the first RB set may be given by (R-N_start) mod R. The size of the last RB set may be given by (N_sumRB+N_start) mod R if (N_sumRB+N_start) mod R is not equal to 0. Otherwise, the size of the last RB set may be specified by R. o Regarding "scheduled RBs for a given transmission", N_sumRB and N_start may indicate the total number of RBs and the index of the first RB in a given transmission (e.g., for a PUSCH transmission). o For "RBs in BWP / CC", N_sumRB and N_start may specify the total number of RBs for the BWP or CC and the index of the first RB (e.g., for PUSCH transmission). For other RB pairs, the size can be given by R. For example, R=8 and / or the precoding RB set partition can be 60-RB to 92-RB "RB in BWP / CC". Therefore, based on the above rules, The first RB set may be 60-RB to 63-RB. The second RB set can be 64-RB to 71-RB. The third RB set may be 72-RB to 79-RB. The fourth RB set may be 80-RB to 87-RB. The fifth RB set may be 88-RB to 92-RB. Example-2: Granularity of the number of precoding RB sets where the “scheduled RBs for a given transmission” and / or “RBs in BWP / CC” are divided into T consecutive RBs. ● The size of the first and / or last RB may be given by N_sumRB-floor(N_sumRB / T)*(T-1). ● Otherwise, the size of the RB can be given by floor(N_sumRB / T). For example, T=4, and / or the precoding RB set partition may be 50-RB ​​to 72-RB "scheduled RBs for transmission." Therefore, based on the above rule, the size of the last RB may be given by N_sumRB-floor(N_sumRB / T)*(T-1). The first RB set may be 50-RB ​​to 54-RB. The second RB set can be 55-RB to 59-RB. The third RB set can be 60-RB to 64-RB. The fourth RB can be 65-RB to 72-RB. In some embodiments, at least one of the MCS, RI, and / or WB precoding information may be indicated by a first DCI (e.g., DCI format 0_0 / 1 / 2) and / or MAC-CE. Other SB precoding information (e.g., including co-phase) may be indicated by a second DCI. The first DCI and the second DCI may have the same HARQ process number. In some embodiments, the first DCI and the second DCI may be associated (e.g., based on an associated search space set). In some embodiments, at least one of the first DCI and / or the second DCI may satisfy at least one of the following conditions for indicating the corresponding DCI with a DL / UL allocation: · The HARQ process number field in the DCI can be set / configured to a specific value (e.g., all "0"s and / or pre-configured by an RRC command). The redundancy version field of the DCI can be set to a specific value (e.g., all '0's). The modulation and coding scheme (MCS) field of the DCI may be set to a specific value (e.g., all '1's). The frequency domain resource allocation field of the DCI may be set to a specific value (e.g., all '0' or all '1'). The uplink or downlink shared channel indicator field of the DCI may be set to a specific value (e.g., "1" or "0"). In some embodiments, "all '0's" and "all '1's" can indicate that all bits of the corresponding DCI field are equal to "0" or "1".

[0055] To achieve flexible signaling to indicate parameters for up to 8 Tx and frequency selective precoding, RRC configuration and / or RRC+MAC-CE / DCI configuration can be used for the set of transmission parameters. ●The set of transmission parameters may include at least one of a coherent type, a number of antenna ports, a number of port groups, a number of antenna ports for a port group, a combination of one or more port groups, a number of ranks, a number of ranks for a port group, a combination of ranks, a granularity of precoding information, a number of precoding information, a number of subbands, a size of a subband, and / or a codebook type. ●In some embodiments, the wireless communication device may report one or more candidate parameter sets in the capability signaling (e.g., support for eight antenna ports, a combination of two types of antenna ports ({two antenna ports, two antenna ports, two antenna ports, two antenna ports} and / or {four antenna ports, four antenna ports}), and / or a maximum rank number = 4). For example, based on this information, the wireless communication device may receive one RRC configuration for one set of transmission parameters in RRC (e.g., one antenna port combination {4 antenna ports, 4 antenna ports} is enabled and / or maximum rank number for PUSCH transmission = 4). In one example, based on the information, the wireless communication device can configure two of the transmission sets (e.g., Set-1 ("one antenna port combination {four antenna ports, four antenna ports} is enabled and / or maximum rank number of PUSCH transmission = 4") and / or Set-2 (one antenna port combination {two antenna ports, two antenna ports, two antenna ports, two antenna ports} is enabled and maximum rank number of PUSCH transmission = 4"). At least one of the two sets can be activated and / or indicated by a MAC-CE / DCI command. I. Uplink Frequency Selective Precoding

[0056] 12 shows a flow diagram of a method 1250 for uplink frequency selective precoding. The method 1250 may be implemented using any of the components and devices detailed herein in connection with FIGS. 1-11. In overview, the method 1250 may include receiving 1252 a first signaling including a plurality of precoding information. The method 1250 may include 1254 determining a precoded signal according to the plurality of precoding information. The method 1250 may include 1256 transmitting the signal.

[0057] Referring now to operation (1252), in some embodiments, a wireless communication device (e.g., a UE) may receive and / or acquire first signaling from a wireless communication node. The first signaling may include multiple precoding information (e.g., PMI, TPMI, precoding and / or beam information). The precoding information may be associated with (or mapped to) multiple port groups (e.g., antenna groups, antenna port groups, and / or UE port groups). In some embodiments, the wireless communication device may receive and / or acquire second signaling (e.g., RRC signaling, MAC-CE signaling, DCI signaling, and / or other types of signaling). The first signaling and / or the second signaling may include mapping information. The mapping information may associate, relate, and / or map each of the multiple precoding information with a corresponding one of the multiple port groups. In certain embodiments, each of the plurality of precoding information may be associated with a corresponding one of the plurality of port groups according to an order (e.g., according to an order of the precoding information or an order of the port groups). In some embodiments, the first signaling may include a first flag, a codepoint in a field of the DCI, a first bit value in a bitmap, and / or a first matrix element value (e.g., W in W). i). The first flag, the first bit value in the bitmap, and / or the first matrix element value may indicate and / or specify whether a first port group of the plurality of port groups is enabled or disabled. In one example, the first flag, the first bit value in the bitmap, and / or the first matrix element value may indicate whether a first precoding information of the plurality of precoding information corresponding to a first port group of the plurality of port groups is a matrix having all zero elements. In a particular embodiment, a first port group of the plurality of port groups may be disabled. When a first port group of the plurality of port groups is disabled, the precoding information corresponding to the first port group may be excluded from determining a signal (e.g., determining a precoded signal according to the plurality of precoding information).

[0058] In some embodiments, a wireless communication device may send, transmit, and / or broadcast a capability report of the wireless communication device to a wireless communication node. The capability report may include (and / or provide) information including at least one of the following: the number of port groups, the number of ports per port group, the number of horizontal antenna elements on one polarization (e.g., N1), the number of vertical antenna elements on one polarization (e.g., N2), information regarding the distance between two antenna elements or two port groups, a coherence type, the number of antenna ports for a port group, a combination of one or more port groups, the number of ranks, the number of ranks for a port group, the rank combination, the granularity of precoding information, the number of precoding information, the number of subbands, the size of the subbands, and / or the codebook type. The number of horizontal antenna elements on one polarization may indicate the number of antenna elements in a horizontal region for one type of polarization. The number of vertical antenna elements on one polarization may indicate the number of antenna elements in a vertical region for one type of polarization.

[0059] In some embodiments, a wireless communication device may receive a configuration. The configuration may include (and / or indicate) at least one of a coherence type, a number of antenna ports, a number of port groups, a number of antenna ports for a port group, a combination of one or more port groups, a number of ranks, a number of ranks for a port group, a combination of ranks, a granularity of precoding information, a number of precoding information, a number of subbands, a size of subbands, and / or a codebook type. In particular embodiments, the wireless communication device may receive (e.g., via signaling) a configuration of multiple transmission modes. Each transmission mode may include (and / or may provide) at least one of a coherence type (e.g., non-coherent, partially coherent, fully coherent, and / or a combination), a number of antenna ports, a number of port groups, a number of antenna ports for a port group, a combination of one or more port groups, a number of ranks, a number of ranks for a port group, a combination of ranks, a granularity of precoding information, a number of subbands, a size of subbands, and / or a codebook type. In some embodiments, the wireless communication device may receive the configuration via the first signaling and / or the second signaling (or other types of signaling). In particular embodiments, the configuration may include or correspond to an RRC configuration and / or other types of configuration. In some embodiments, the wireless communication device may receive / obtain a selection of one of a plurality of transmission modes from the wireless communication node. The wireless communication device may receive the selection via the first signaling and / or via other types of signaling, such as signaling different from the signaling through which the configuration is received.

[0060] In some embodiments, the one or more port group combinations are: {1 antenna port, 1 antenna port}, {2 antenna ports}, {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports}, {4 antenna ports}, {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {4 antenna ports, 2 antenna ports}, {3 antennas The first signaling may include at least one of {two antenna ports, three antenna ports}, {six antenna ports}, {one antenna port, one antenna port, one antenna port, one antenna port, one antenna port, one antenna port, one antenna port, one antenna port, one antenna port}, {two antenna ports, two antenna ports, two antenna ports, two antenna ports}, {two antenna ports, two antenna ports, four antenna ports}, {six antenna ports, two antenna ports}, {four antenna ports, four antenna ports}, and / or {eight antenna ports}. In certain embodiments, the first signaling may include coherence information. The coherence information may correspond to one or more of the plurality of port groups. In one example, coherence information may be provided per port group, but the coherence for the first group may be fixed / set / configured to 1. The coherence information for the other groups may be indicated by the wireless communication node. In some embodiments, at least one of the plurality of port groups may be fully coherent. If at least one of the multiple port groups is fully coherent, the distance between the two port groups may be an unlimited value and / or is K*λ. In some embodiments, λ represents wavelength. In some embodiments, K can be a defined value and / or a value reported in capability signaling.

[0061] Referring now to operation (1254), in some embodiments, the wireless communication device may determine a precoded signal according to the plurality of precoding information. In particular embodiments, the signal may include or correspond to at least one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and / or a demodulation reference signal (DMRS). In some embodiments, the plurality of precoding information (e.g., PMI, TPMI, precoding or beam information) may include a differential transmission precoding matrix index (TPMI) for each layer and / or subband. In particular embodiments, the wireless communication device may determine the first precoding information for the first subband using a Mod function. The Mod function may be implemented for each layer. In particular embodiments, one of the plurality of precoding information may correspond to the subband. In some embodiments, the wireless communication device may receive first signaling and / or second signaling (e.g., DCI and / or other types of signaling) from the wireless communication node. The first / second signaling may include at least one of an MCS per codeword or transmission block, an RI or number of layers per port group, a field providing RI and precoding information for the first subband, the number of precoding information, the number of subbands, the size of the subband, and / or the granularity of the precoding information. In some embodiments, the RI can be applied to all other subbands, or a field providing precoding information and the same RI for all other subbands.

[0062] In certain embodiments, the size of the subbands and / or the size of the granularity of the precoding information can be determined according to configuration parameters. The configuration parameters can be related to (or associated with) the granularity of the precoding information, the number of resource blocks (RBs) corresponding to the signal, the index of the starting RB corresponding to the signal, the number of subbands, the subcarrier spacing (SCS), the total number of resource blocks for a component carrier (CC) or bandwidth portion (BWP), the index of the starting RB corresponding to the CC or BWP, the total number of SRS resources, and / or the number of SRS ports or antenna ports. In some embodiments, a Mod function can be implemented (e.g., by a wireless communication device) to determine the size of the first or last subband of the signal. In certain embodiments, a floor function can be implemented (e.g., by a wireless communication device) to determine the size of each subband of the signal. In certain embodiments, the number of subcarrier spacing (SRS) ports or antenna ports can be greater than or equal to a first threshold. In some embodiments, the number of resource blocks (RBs) for a transmission, or the bandwidth portion (BWP) or component carrier (CC) carrying the transmission can be greater than or equal to a second threshold. In certain embodiments, the rank or number of layers for transmission may be greater than or equal to a third threshold. In some embodiments, candidate values ​​for at least one of the granularity of the precoding information, the number of precoding information, the number of subbands, and / or the size of the subbands may be reported as user equipment (UE) capabilities (e.g., capabilities of a wireless communication device).

[0063] Referring now to operation 1256, in some embodiments, the wireless communication device may transmit, send, broadcast, and / or communicate a signal to a wireless communication node. Thus, the wireless communication node may receive a signal precoded by the wireless communication device according to the plurality of precoding information. In particular embodiments, the wireless communication device may transmit, send, and / or broadcast a signal via N antenna ports. In one example, the parameter N may include or correspond to 1, 2, 4, 6, and / or 8 (or other values). In some embodiments, when N is 2, the N antenna ports may be formed from a combination of {1 antenna port, 1 antenna port} and / or {2 antenna ports} port groups. In one example, when N is 4, the N antenna ports may be formed from a combination of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports}, and / or {4 antenna ports} port groups. In some embodiments, when N is 6, the N antenna ports may be formed from a combination of port groups of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports}, {4 antenna ports, 2 antenna ports}, {3 antenna ports, 3 antenna ports}, and / or {6 antenna ports}.In one example, when N is 8, the N antenna ports may be formed from a combination of port groups of {1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port, 1 antenna port}, {2 antenna ports, 2 antenna ports, 2 antenna ports, 2 antenna ports}, {2 antenna ports, 2 antenna ports, 4 antenna ports}, {6 antenna ports, 2 antenna ports}, {4 antenna ports, 4 antenna ports}, and / or {8 antenna ports}. In some embodiments, when N is 8, the N antenna ports can be in an (N1,N2) configuration (e.g., a (1,4), (2,2), or (4,1) configuration). N1 may indicate and / or specify the number of horizontal antenna elements on one polarization. N2 may indicate and / or provide the number of vertical antenna elements on one polarization. In certain embodiments, the rank may be the same across all subbands. For example, all subbands and / or resources corresponding to a signal may have the same rank. In some embodiments, the rank and / or precoding information of each of the port groups may be jointly encoded in a field of the second signaling. In particular embodiments, a maximum value of rank may be configured per port group and / or per bandwidth portion (BWP). In some embodiments, one or more of the port groups may be associated (or mapped) to a corresponding uplink codeword.

[0064] In particular embodiments, the wireless communication device may receive second signaling (e.g., RRC and / or MAC-CE signaling) from the wireless communication node. The second signaling may include multiple parameter configurations for some or all subbands (e.g., SB and / or WB). The wireless communication device may receive / obtain first signaling and / or third signaling (e.g., DCI) from the wireless communication node. The third signaling may indicate a first parameter configuration of the multiple parameter configurations. For example, several combinations of WB and / or SB parameters may be activated by MAC-CE and / or RRC signaling, and one combination may be indicated by DCI signaling. In some embodiments, each of the multiple precoding information may include at least one of a precoding group indication, a precoding indication, and / or a coherence indication. In particular embodiments, the precoding indication may relate to all subbands or signals. In some embodiments, the coherence indication may relate to a corresponding one of the subbands. In some embodiments, the precoding group indication may be for all subbands (e.g., WB) or signals. In particular embodiments, the precoding indication from the indicated precoding group and / or the coherence indication may be for a corresponding one of the subbands. The precoding group indication and the precoding indication from the indicated precoding group may be for all subbands or signals. In some embodiments, the coherence indication may be for a corresponding one of the subbands. In particular embodiments, the precoding matrix may be common to any polarization or layer of any of the port groups. The coherence may be specific to each polarization or layer. In some embodiments, the precoding matrix may be specific to the corresponding port group. The coherence may be specific to the polarization or layer of the corresponding port group. In particular embodiments, the coherence for one of the port groups may be indicated on a subband-by-subband basis.In some embodiments, the coefficient between two of the port groups may be 0 or may be indicated on a per subband basis.

[0065] In particular embodiments, the wireless communication device may receive second signaling (e.g., RRC and / or MAC-CE signaling) from the wireless communication node. The second signaling may include one or more granularities of precoding information. The wireless communication device may receive third signaling (e.g., DCI and / or MAC-CE signaling) from the wireless communication node. The third signaling may indicate a first granularity of the one or more granularities. For example, the wireless communication device (e.g., UE) may be configured with one or more granularities according to the RRC and / or MAC-CE signaling. The wireless communication device may configure at least one of the one or more granularities according to the DCI and / or MAC-CE signaling. In some embodiments, the second signaling may include at least one of an MCS, an RI, and / or precoding information for all subbands or signals (e.g., WB precoding information and / or precoding information applied to the entire signal or resources of the signal). The wireless communication device may receive first signaling and / or third signaling (e.g., second DCI) from the wireless communication node. The third signaling may include precoding information for the first subband (e.g., SB precoding information). In one example, at least one of the MCS, RI, and / or WB precoding information may be indicated by the first DCI (e.g., DCI format 0_0 / 1 / 2) and / or MAC-CE signaling. Another SB precoding information (including in-phase) may be indicated by the second DCI. In some embodiments, at least two of the first signaling, the second signaling, or the third signaling may have the same Hybrid Automatic Request (HARQ) process number. In a particular embodiment, the search space of the second signaling may be associated with the search space of the first signaling and / or the third signaling. In some embodiments, the HARQ process number field of the first signaling, the second signaling, and / or the third signaling may be set to a particular value.In certain embodiments, the redundancy version field of the first signaling, the second signaling, and / or the third signaling may be set to a particular value. In some embodiments, the MCS field of the first signaling, the second signaling, and / or the third signaling may be set to a particular value. In certain embodiments, the frequency domain resource allocation field of the first signaling, the second signaling, and / or the third signaling may be set to a particular value. In some embodiments, the uplink or downlink shared channel indicator field of the first signaling, the second signaling, and / or the third signaling may be set to a particular value.

[0066] While various embodiments of the present solution have been described above, it should be understood that they are presented by way of example only, and not by way of limitation. Similarly, various diagrams may depict example architectures or configurations provided to enable those skilled in the art to understand example features and functionality of the present solution. However, such persons will understand that the solution is not limited to the example architectures or configurations depicted, but can be implemented using various alternative architectures and configurations. Furthermore, as will be understood by those skilled in the art, one or more features of one embodiment can be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the example embodiments described above.

[0067] It is also understood that any reference to an element herein using a designation such as "first," "second," etc., does not generally limit the quantity or order of those elements. Rather, these designations may be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to a first and a second element does not imply that only two elements can be used or that the first element must in any way precede the second element.

[0068] Additionally, those skilled in the art will understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, and symbols that may be referred to in the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0069] Those skilled in the art will further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., digital implementations, analog implementations, or a combination of the two), firmware, various forms of programs or design code incorporating instructions (which may be referred to herein for convenience as “software” or “software modules”), or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functions in varying ways for each particular application, and such implementation decisions do not depart from the scope of the present disclosure.

[0070] Furthermore, those skilled in the art will understand that the various example logic blocks, modules, devices, components, and circuits described herein can be implemented within or performed by an integrated circuit (IC), which may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logic blocks, modules, and circuits may further include an antenna and / or transceiver for communicating with various components within a network or device. A general-purpose processor may be a microprocessor, although in alternative examples, the processor may be any conventional processor, controller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other suitable configuration for performing the functions described herein.

[0071] If implemented in software, the functions can be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media, including any medium that can enable a computer program or code to be transferred from one place to another. A storage medium can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

[0072] In this document, the term "module" as used herein refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Furthermore, for purposes of explanation, various modules are described as individual modules; however, as will be apparent to one skilled in the art, two or more modules may be combined to form a single module that performs the associated functions according to embodiments of the present solution.

[0073] Furthermore, memory or other storage devices and communication components may be used in embodiments of the solution. It will be understood that, for clarity, the above has described embodiments of the solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements, or domains may be used without detracting from the solution. For example, functionality shown to be performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Thus, references to specific functional units do not indicate a strict logical or physical structure or organization, but merely to suitable means for providing the described functionality.

[0074] Various modifications to the embodiments described in this disclosure have been described above and will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

[Claim 1] The invention described in this specification.

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