8TX codebook enhancements

Abstract

An exemplary method includes receiving a configuration from a wireless communication node. The configuration indicates at least one of a number of one or more port groups or one or more levels of coherence. The exemplary method further includes determining a precoder for the transmission according to the configuration. The exemplary method further includes performing the transmission using the precoder. In some embodiments, a total number of ports among the port groups is eight. In one embodiment, the method further includes transmitting information to the wireless communication node indicating the number of one or more supported port groups or the one or more supported levels of coherence.

Description

[Technical Field]

[0001] TECHNICAL FIELD This disclosure relates generally to digital wireless communications. [Background technology]

[0002] Mobile communication technologies are moving the world towards an increasingly connected and networked society. Compared to existing wireless networks, next-generation systems and wireless communication technologies will need to support a much wider range of use case characteristics and provide a more complex and sophisticated range of access requirements and flexibility.

[0003] Long Term Evolution (LTE) is a standard for wireless communications for mobile devices and data terminals developed by the 3rd Generation Partnership Project (3GPP®). LTE Advanced (LTE-A) is a wireless communications standard that extends the LTE standard. The fifth-generation wireless system, known as 5G, advances the LTE and LTE-A wireless standards and is dedicated to supporting higher data rates, a large number of connections, ultra-low latency, high reliability, and other emerging business needs. Summary of the Invention [Means for solving the problem]

[0004] Techniques for enhancing 8Tx transmit precoding are disclosed. Exemplary embodiments disclosed herein address technical issues related to current codebook issues, precoder instruction overhead, and unclear port indexing for uplink 8Tx. The exemplary embodiments provide solutions for determining a codebook for uplink 8Tx transmission, reducing the number of non-coherent codebook candidates, and port index mapping.

[0005] In an exemplary aspect, a method for wireless communication is described. The method includes receiving a configuration from a wireless communication node indicating at least one of a number of one or more port groups or one or more levels of coherence. The method further includes determining a precoder for transmission according to the configuration. The method further includes performing the transmission using the precoder.

[0006] In some embodiments, the total number of ports is 8. In some embodiments, the number of the one or more port groups indicated by the configuration includes one or more of 1 port group, 2 port groups, 4 port groups, or 8 port groups. The one or more levels of coherence indicated by the configuration include one or more of full coherence, partial coherence of a first type, partial coherence of a second type, and no coherence.

[0007] In some embodiments, the method further includes transmitting information to the wireless communication node indicating one or more numbers of supported port groups or one or more levels of supported coherence. In some embodiments, the indicated number of port groups or the indicated level of coherence is a highest capability indicating that one or more capabilities lower than the highest capability are configured or supported. In some embodiments, the order of port group capabilities from highest to lowest is one port group, two port groups, four port groups, and eight port groups, and the order of coherence capabilities from highest to lowest is full coherence, partial coherence of a first type, partial coherence of a second type, and no coherence.

[0008] In some embodiments, determining a precoder for a transmission according to the configuration includes determining the presence or size of an indication of the number of port groups for the codebook indication according to the configuration. In some embodiments, determining a precoder for a transmission according to the configuration includes determining one or more port group numbers for the codebook indication and determining the presence or size of an indication of the number of port groups according to the determined one or more port group numbers for the codebook indication. In some embodiments, determining a precoder for a transmission according to the configuration includes determining a given number of port groups according to the indication of the number of port groups and determining at least one of a rank, a number of layers, or a transmit precoding matrix indicator (TPMI) for each port group of the given number of port groups. In some embodiments, determining a precoder for a transmission according to the configuration includes determining a given number of port groups according to the indication of the number of port groups, determining a phase between every two port groups of the given number of port groups, and determining at least one of a rank or a TPMI for at least some of the port groups of the given number of port groups. In some embodiments, the indication of the number of port groups is included in downlink control information (DCI), medium access control (MAC) control element (CE), or radio resource control (RRC) signaling.

[0009] In some embodiments, the precoder is determined from parameters of a downlink codebook-based scheme based on the one or more port groups being one port group, or the precoder is determined from parameters of an uplink codebook-based scheme based on the one or more port groups being two or more port groups that are coherent.

[0010] In some embodiments, the method further includes determining a value of the oversampling factor for the polarization direction according to the number of antenna elements on the polarization direction.

[0011] In some embodiments, the configuration is received via one of RRC signaling, MAC CE, or DCI.

[0012] In some embodiments, the precoder is determined based on at least one of the number of port groups, the starting port index, or the port index order. In some embodiments, the precoder is determined based on a sequential numbering of port indexes according to at least one of the number of port groups, the starting port index, or the port index order. In some embodiments, the starting port index is determined based on the number of port groups. In some embodiments, the port index order is one of {0, 4, 1, 5, 2, 6, 3, 7}, {0, 1, 2, 3, 4, 5, 6, 7}, {0, 2, 1, 3, 4, 6, 5, 7}, {0, 1, 4, 5, 2, 3, 6, 7}, or {0, 4, 2, 6, 1, 5, 3, 7}.

[0013] In some embodiments, the method further includes mapping ports of the one or more port groups to ports of the precoder according to at least one of one or more predefined mappings. In some embodiments, the one or more predefined mappings include mapping two port groups, each having four ports, to ports {0,1,4,5,2,3,6,7} of the precoder or ports {0,2,4,6,1,3,5,7} of the precoder, or mapping four port groups, each having two ports, to ports {0,4,1,5,2,6,3,7} of the precoder.

[0014] In another exemplary aspect, another method for wireless communication is disclosed. The method includes transmitting a configuration to a wireless communication device indicating at least one of a number of one or more port groups or one or more levels of coherence. The method further includes indicating to the wireless communication device an indication of a precoder for transmission according to the configuration or an indication of the number of port groups. The transmission is then performed using the precoder.

[0015] In some embodiments, the method further includes determining the presence or size of an indication of the number of port groups for the codebook indication.

[0016] In some embodiments, the total number of ports is 8. In some embodiments, the particular number of port groups is one of 1 port group, 2 port groups, 4 port groups, or 8 port groups. The particular level of coherence is one of full coherence, partial coherence of a first type, partial coherence of a second type, and no coherence.

[0017] In some embodiments, the number of port groups indicated or the level of coherence indicated is a highest capability indicating that one or more capabilities lower than the highest capability are supported or configured. In some embodiments, the order of port group capabilities from highest to lowest is one port group, two port groups, four port groups, and eight port groups, and the order of coherence capabilities from highest to lowest is full coherence, partial coherence of a first type, partial coherence of a second type, and no coherence.

[0018] In some embodiments, the indication of the number of port groups is included in the DCI, MAC CE, or RRC signaling.

[0019] In some embodiments, the method further includes indicating the number of antenna elements in a polarization direction in the configuration.

[0020] In some embodiments, the configuration is conveyed via one of radio resource control (RRC) signaling, a medium access control (MAC) control element, or a downlink control indicator (DCI).

[0021] In yet another exemplary aspect, the methods described above are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium, the code contained on the computer-readable storage medium, when executed by a processor, causing the processor to perform the methods described in this patent document.

[0022] In yet another exemplary embodiment, a device configured or operable to perform the above-described method is disclosed.

[0023] These and other aspects and their implementations are described in more detail in the drawings, description, and claims. The present invention provides, for example, the following. (Item 1) 1. A method for wireless communication, the method comprising: receiving a configuration from a wireless communication node indicating at least one of a number of one or more port groups or one or more levels of coherence; determining a precoder for transmission according to the configuration; performing the transmission using the precoder; and A method comprising: (Item 2) Item 1. The method according to item 1, wherein the total number of ports is eight. (Item 3) Item 10. The method of claim 1, wherein the one or more number of port groups indicated by the configuration comprises one or more of one port group, two port groups, four port groups, or eight port groups, and the one or more levels of coherence indicated by the configuration comprises one or more of full coherence, a first type of partial coherence, a second type of partial coherence, and no coherence. (Item 4) Item 10. The method of item 1, further comprising transmitting information to the wireless communication node indicating one or more numbers of supported port groups or one or more levels of supported coherence. (Item 5) 5. The method of any one of items 1 or 4, wherein the indicated number of port groups or the indicated level of coherence is a maximum capability and indicates that one or more capabilities lower than the maximum capability are configured or supported. (Item 6) Item 6. The method of item 5, wherein the order of port group capabilities from highest to lowest is 1 port group, 2 port groups, 4 port groups, and 8 port groups, and the order of coherence capabilities from highest to lowest is full coherence, first type partial coherence, second type partial coherence, and no coherence. (Item 7) determining a precoder for transmission in accordance with the configuration, Item 10. The method of item 1, comprising determining the presence or size of an indication of the number of port groups for a codebook indication according to the configuration. (Item 8) determining a precoder for transmission in accordance with the configuration, determining a number of one or more port groups for the codebook indication; determining the presence or size of an indication of the number of port groups according to the determined number of one or more port groups for the codebook indication; The method according to item 1, comprising: (Item 9) determining a precoder for transmission in accordance with the configuration, determining a given number of port groups according to an indication of the number of port groups; determining at least one of a rank, a number of layers, or a transmit precoding matrix indicator (TPMI) for each port group of the given number of port groups; Item 1. The method according to item 1, comprising: (Item 10) determining a precoder for transmission in accordance with the configuration, determining a given number of port groups according to an indication of the number of port groups; determining a phase between every two port groups of the given number of port groups; determining at least one of a rank, a number of layers, or a TPMI for at least some of the port groups of the given number of port groups; Item 1. The method according to item 1, comprising: (Item 11) 11. The method according to any one of items 7 to 10, wherein the indication of the number of port groups is included in DCI, MAC CE, or RRC signaling. (Item 12) Item 3. The method of claim 3, wherein the precoder is determined from parameters of a downlink codebook-based scheme based on the one or more port groups being one port group, or the precoder is determined from parameters of an uplink codebook-based scheme based on the one or more port groups being two or more coherent port groups. (Item 13) Item 10. The method of item 1, further comprising determining a value of an oversampling factor for a polarization direction according to the number of antenna elements in the polarization direction. (Item 14) Item 1, wherein the configuration is received via one of a radio resource control (RRC) signaling, a medium access control (MAC) control element, or a downlink control indicator (DCI). (Item 15) Item 10. The method of claim 1, wherein the precoder is determined based on at least one of a number of port groups, a starting port index, or a port index order. (Item 16) Item 2. The method of item 1, wherein the precoder is determined based on consecutive port index numbers according to at least one of the number of port groups, a starting port index, or a port index order. (Item 17) Item 16. The method of item 15, wherein the starting port index is determined based on the number of port groups. (Item 18) 18. The method of any of items 15 to 17, wherein the port index order is one of {0,4,1,5,2,6,3,7}, {0,1,2,3,4,5,6,7}, {0,2,1,3,4,6,5,7}, {0,1,4,5,2,3,6,7}, or {0,4,2,6,1,5,3,7}. (Item 19) Item 10. The method of item 1, further comprising mapping ports of one or more port groups to ports of the precoder according to at least one of one or more predefined mappings. (Item 20) The one or more predefined mappings include: a mapping of two port groups, each having four ports, to ports {0, 1, 4, 5, 2, 3, 6, 7} of the precoder or ports {0, 2, 4, 6, 1, 3, 5, 7} of the precoder; or Mapping of four port groups, each with two ports, to ports {0, 4, 1, 5, 2, 6, 3, 7} of the precoder 20. The method according to item 19, comprising: (Item 21) 1. A method for wireless communication, the method comprising: transmitting a configuration to the wireless communication device indicating at least one of a number of one or more port groups or one or more levels of coherence; indicating to the wireless communication device an indication of the number of precoders or port groups for transmission according to the configuration; A method comprising: (Item 22) 22. The method of claim 21, further comprising determining the presence or size of an indication of the number of port groups for the codebook indication. (Item 23) Item 22. The method of item 21, wherein the total number of ports is eight. (Item 24) Item 22. The method of item 21, wherein the one or more port groups comprise one or more of one port group, two port groups, four port groups, or eight port groups, and the one or more levels of coherence comprise one or more of full coherence, a first type of partial coherence, a second type of partial coherence, and no coherence. (Item 25) 25. The method of any one of items 21 to 24, wherein the indicated number of port groups or the indicated level of coherence is a maximum capability and indicates that one or more capabilities lower than the maximum capability are supported or configured. (Item 26) Item 26. The method of item 25, wherein the order of port group capabilities from highest to lowest is 1 port group, 2 port groups, 4 port groups, and 8 port groups, and the order of coherence capabilities from highest to lowest is full coherence, first type partial coherence, second type partial coherence, and no coherence. (Item 27) 22. The method of claim 21, wherein the indication of the number of port groups is included in DCI, MAC CE, or RRC signaling. (Item 28) 22. The method of claim 21, further comprising indicating the number of antenna elements for a polarization direction in the configuration. (Item 29) 22. The method of claim 21, wherein the configuration is transmitted via one of DCI, MAC CE, or RRC signaling. (Item 30) 30. An apparatus for wireless communication comprising a memory and a processor, the processor implementing the method of any one of items 1 to 29 by executing instructions stored on the memory. (Item 31) 30. A non-transitory computer readable medium storing code that, when executed by a processor, causes the processor to perform the method of any one or more of items 1 to 29. [Brief explanation of the drawings]

[0024] [Figure 1] 1A-1C show different physical antenna layouts for different numbers of port groups.

[0025] [Figure 2] FIG. 2 shows an exemplary grouping of 8 Tx ports.

[0026] [Figure 3] FIG. 3 shows an exemplary grouping of 8 Tx ports by downlink port index scheme.

[0027] [Figure 4] FIG. 4 shows an exemplary grouping of 8 Tx ports by uplink port index scheme.

[0028] [Figure 5] FIG. 5 illustrates an exemplary flowchart related to 8Tx transmit precoding according to a network configuration.

[0029] [Figure 6] FIG. 6 illustrates an example flowchart related to 8Tx transmit precoding including user equipment (UE) capability reporting.

[0030] [Figure 7] FIG. 7 shows an example block diagram of a hardware platform that may be part of a network or communication device.

[0031] [Figure 8] FIG. 8 illustrates an example of wireless communication involving a base station (BS) and a UE according to some implementations of the disclosed techniques. DETAILED DESCRIPTION OF THE INVENTION

[0032] The new radio (NR) technology of the fifth-generation (5G) mobile communication system is continuously being improved to provide higher-quality wireless communications. One of its key features is support for high-frequency bands. Although high-frequency bands have abundant frequency domain resources, radio signals in high-frequency bands attenuate rapidly, resulting in a small effective range. Therefore, transmitting signals in beam mode can concentrate energy in a relatively small spatial area and improve the effective range of high-frequency band radio signals.

[0033] However, several technical issues exist, particularly with regard to signal transmission in beam mode and other exemplary scenarios. First, for user equipment (UE) configured for full coherence, a downlink (DL) Type I codebook or an uplink (UL) 2Tx / 4Tx codebook can be adopted for transmission, but the downlink Type I codebook is not defined for some cases, including multi-panel coherent scenarios. Second, the overhead of precoder indication is large. Third, port indexing for uplink (UL) 8Tx is unclear. The exemplary embodiments disclosed herein address at least these technical issues.

[0034] The example headings of the various sections below are used to facilitate understanding of the disclosed subject matter and are not intended to limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section may be combined with one or more features of another example section. Furthermore, although 5G terminology is used for clarity of description, the technology disclosed herein is not limited to 5G technology alone and may be used in wireless systems implementing other protocols. (Example embodiment 1)

[0035] The embodiments disclosed herein relate to a method for determining a codebook for UL8Tx.

[0036] As shown, for fully coherent UEs, the DL Type I codebook or the UL2TX / 4TX codebook can be employed, but the DL Type I codebook is not defined for some cases for multi-panel coherent scenarios. Furthermore, as shown, the overhead of precoder indication is large.

[0037] Table 1 shows the supported codebooks and rank indications according to the number of port groups and coherence capabilities. Table 1 lists different multi-panel coherence scenarios. [Table 1]

[0038] Physical antenna layouts corresponding to those depicted in Table 1 are shown in Figures 1A-1C. In some embodiments, each square shown in each of Figures 1A-1C represents a pair of antenna ports, and Figures 1A-3C show physical antenna layouts for 8Tx. For example, Figure 1A shows an example physical layout for one port group, Figure 1B shows an example physical layout for two port groups, and Figure 1C shows an example physical layout for four port groups. As shown in Table 1 and illustrated in Figures 1B and 1C, different multi-panel coherence scenarios exist for at least the two port group and four port group examples.

[0039] (1. Design for a Fully Coherent 8-Tx Codebook:)

[0040] For fully coherent UE, the following categories are considered:

[0041] CAT-A0: One port group that is coherent within the port group (having 8 Tx ports).

[0042] CAT-A1: Two port groups (each with 4 Tx ports) that are coherent within the port group and non-coherent between groups.

[0043] CAT-A2: 4 port groups (each with 2 Tx ports) that are coherent within a port group and non-coherent between groups.

[0044] Note that port groups can be implemented on one panel or on multiple panels with uniform spacing.

[0045] In some embodiments, for full coherent codebook design:

[0046] A DL Type I single panel codebook scheme may be used for CAT-A0.

[0047] The DL Type I multi-panel codebook scheme may be used for CAT-A1 and A2.

[0048] Regarding the full coherent codebook design, CAT-A0 and CAT-A1 may have the same UL4Tx transmit precoding matrix indicator (TPMI)-based scheme, i.e., one common UL4Tx TPMI and additional co-phases. CAT-A2 may have a similar scheme, i.e., one common UL2Tx TPMI and three additional co-phases.

[0049] For example, the UL4-Tx codebook scheme provides 4-port codebooks of rank 1 / 2 / 3 / 4, which have an additional phase offset φ n Then, the 8-port codebooks of ranks 1 to 8 can be determined as a part of the sequence, for example, the first R (rank value) sequence. 4×4 The fully coherent codebook is an 8-port codebook W of rank 8, as shown in Equation 1 below. 8×8 can be expanded to

number

[0050] Similarly, the basic W 2×2 The fully coherent codebook is an 8-port codebook W of rank 8, as shown in Equation 2 below. 8×8 can be expanded to

number

[0051] In some instances, φ n The number of possible values ​​of is 2 or 4.

[0052] Therefore, it may be possible to adopt a DL-based codebook scheme for the fully coherent case of one port group (e.g., CAT-A0 above) and a UL-based codebook scheme for the fully coherent case of multiple port groups (e.g., CAT-A1 and A2 above).

[0053] 2. Design for Partially Coherent 8-Tx Codebook:

[0054] A partially coherent 8-Tx codebook may be used for partially coherent UEs and for full and partial coherent UEs.

[0055] The 8Tx ports can be divided into multiple port groups to support partial coherence, where ports contained within a port group are coherent and ports across the port group can be coherent or non-coherent.

[0056] In some embodiments, partially coherent 8Tx considers at least the following types:

[0057] Partially coherent type 1, i.e., 4+4: Two port groups with four ports each, each with an individual rank from 0 to 4. For example, CAT-B0 includes two port groups with four Tx ports each, and is non-coherent between groups. For example, CAT-B1 includes four port groups with two Tx ports each, and is coherent among the four Tx ports within a pair of port groups, but non-coherent between the two pairs of port groups.

[0058] Partially coherent type 2, i.e., 2+2+2+2: Four port groups with two ports each, each with an individual rank from 0 to 2. For example, CAT-C0 includes four port groups with two Tx ports each, and is coherent among the four Tx ports within each port group, but non-coherent between port groups.

[0059] In some embodiments, each port group may have an individual TPMI / precoding vector or a shared TPMI / precoding vector, depending on the UE's antenna / panel layout assumptions. If the UE has a similar antenna configuration as the network node (e.g., gNodeB), especially for customer terminal equipment or customer premises equipment (CPE), a shared TPMI / precoding vector is reasonable with lower overhead for TPMI indication. If the port group is coherent, a shared TPMI / precoding vector should be applied.

[0060] With regard to the candidate codebooks for each port group, the UL4-Tx codebook may be considered for the 4-Tx port group, and the UL2-Tx codebook may be considered for the 2-Tx port group. Further considerations are as follows:

[0061] For each port group, the rank may be independent. For each 4-port group, the rank may be 0 to 4. For each 2-port group, the rank may be 0 to 2. However, in some embodiments, the rank for each port group being all 0s is excluded.

[0062] Fully coherent 2Tx / 4Tx TPMI vs. fully coherent + partial + non-coherent 2Tx / 4Tx TPMI: All possible rank + TPMI combinations for each port group can result in a huge number of candidate codebooks for partial coherence. Therefore, in some embodiments, fully coherent 2Tx / 4Tx TPMI is preferred.

[0063] The embodiments disclosed herein include UE capability-related solutions to the above-identified problems and technical issues.

[0064] In some embodiments, to support UL8Tx transmission, the UE transmits capability information regarding port group capabilities and / or coherence capabilities to the network. In some embodiments, the capability information includes at least one of information regarding the number of port groups or information regarding a level of coherence.

[0065] Regarding the information on the number of port groups, one of the following methods may be adopted.

[0066] 1. The number of port groups at the highest level is indicated by the UE to the network. The indication of the number of port groups at the highest level means that the number of port groups at other levels lower than the highest level may be supported. In some embodiments, the level of the number of port groups may be, in descending order, one port group, two port groups, four port groups, or eight port groups. Thus, for example, if the UE indicates the highest level of port groups as two port groups, the UE indicates that the UE also supports four port groups and eight port groups, but does not support one port group.

[0067] 2. The number of port groups of one or more supported levels is indicated by the UE to the network. For example, the UE explicitly indicates the number of each port group supported to the network. The one or more supported levels may be indicated from a predefined set of candidates, each indicating one or more levels, for example according to Table 2. There are 16 entries for the number of port groups or combinations of two or more numbers of port groups. In some embodiments, the candidate entries may include a portion of the entries shown in Table 2. [Table 2]

[0068] Thus, in either manner, in some embodiments, the UE indicates the number of one or more port groups that it supports to the network.

[0069] Regarding the level of coherence information, one of the following approaches can be adopted:

[0070] 1. The highest level of coherence is indicated by the UE to the network. The indication of the highest level of coherence means that other levels of coherence lower than the highest level may be supported. In some embodiments, the levels of coherence may be, in descending order, full coherence, a first type of partial coherence, a second type of partial coherence, and non-coherence, and may be indicated as coherence levels 1, 2, 3, and 4, respectively. Thus, for example, if the UE indicates level 2 of the highest coherence, the UE indicates that the UE supports the first type of partial coherence, the second type of partial coherence, and non-coherence, but does not support full coherence.

[0071] 2. One or more supported levels of coherence are indicated by the UE to the network. The one or more supported levels of coherence may be indicated from a predetermined set of candidates, each indicating one or more levels of coherence, for example according to Table 3. There are 16 entries for levels of coherence or combinations of two or more levels of coherence. In some embodiments, the candidate entries may include some of the entries shown in Table 3. [Table 3]

[0072] Thus, in either scheme, in some embodiments, the UE indicates to the network one or more levels of coherence that the UE supports.

[0073] In some embodiments, the UE may report information on the number of port groups without coherence level information, with 1, 2, 4, or 8 port groups corresponding to the highest coherence levels 1, 2, 3, or 4, respectively.

[0074] In some embodiments, the UE may report information about the number of port groups and the level of coherence. In some examples, one, two, or four port groups may support coherence levels 1, 2, 3, or 4. Eight port groups may support coherence level 4 only.

[0075] In some embodiments, to support UL8Tx transmission, the network may transmit (or indicate or configure) at least one of port group number information or coherence level information to the UE, e.g., via RRC signaling, MAC CE, or DCI. For example, the network (e.g., wireless communication node) transmits a configuration indicating the information to the UE. The port group information and coherence level information may be indicated as described above with respect to UE capabilities.

[0076] In some embodiments, to support UL8Tx transmission, the network may transmit (or indicate or configure) at least one of candidate port group or candidate TPMI / precoder pair information to the UE, e.g., via RRC signaling, MAC CE, or DCI.

[0077] The candidate port group may include port group information (as detailed above with respect to UE capabilities). For example, the candidate port group may be the number of the highest-level port group, meaning that the number of port groups at other levels lower than the highest level may be supported. As another example, the candidate port group may be a code point indicating an entry in a predetermined table (e.g., a table of one or more supported levels of the number of port groups, Table 3). As yet another example, the candidate port group may be a bitmap indicating the partial port groups that may be supported. For example, in the case of four port groups, a bitmap of 0001 indicates that one of the four port groups (e.g., the first or last one, the highest numbered or lowest numbered) is a candidate port group. This candidate port group indication is port group selection information.

[0078] The candidate TPMI / precoder set may include a set of candidate TPMI / precoders with respect to restrictions or availability. For a UE, only a portion of the TPMI / precoders may be allowed to be indicated in the DCI.

[0079] In some embodiments, Tx may be a transmit antenna, an antenna port.

[0080] For a UE that supports 8 Tx with one port group with full coherence level, it may be indicated by default or as supporting two port groups (each with 4 Tx), four port groups (each with 2 Tx), and / or eight port groups (each with 1 Tx). It may support full coherence with one port group (Part 1 of Table 1), a first type of partial coherence with two port groups (Part 2 of Table 1), a second type of partial coherence with four port groups (Part 3 of Table 1), and / or non-coherence with eight port groups (Part 4 from Table 1).

[0081] For a UE that supports 8 Tx with two port groups with a full coherence level, it may be indicated by default as supporting four port groups (each with 2 Tx) and / or eight port groups (each with 1 Tx). It may support full coherence with two port groups (Part 1 of Table 1), a first type of partial coherence with two port groups (Part 2 of Table 1), a second type of partial coherence with four port groups (Part 3 of Table 1), and / or non-coherence with eight port groups (Part 4 above).

[0082] For a UE that supports 8 Tx with two port groups with one partially coherent port, it may be indicated by default as supporting four port groups (each with 2 Tx) and / or eight port groups (each with 1 Tx). It may support a first type of partial coherence with two port groups (Part 2), a second type of partial coherence with four port groups (Part 3), and / or non-coherence with eight port groups (Part 4).

[0083] For a UE supporting 8Tx with four port groups with full coherence level, it may be indicated by default as supporting eight port groups with one port each. It may support full coherence with four port groups (Part 1), a first type of partial coherence with four port groups (Part 2), a second type of partial coherence with four port groups (Part 3), and / or non-coherence with eight port groups (Part 4).

[0084] For a UE that supports 8Tx with four port groups with one partially coherent port, it may be indicated by default as supporting eight port groups with one port each. It may support a first type of partial coherence with four port groups (Part 2), a second type of partial coherence with four port groups (Part 3), and / or non-coherence with eight port groups (Part 4).

[0085] For a UE that supports 8 Tx with 4 port groups with 2 partially coherent ports, it may be indicated as supporting 8 port groups (each with 1 Tx) by default, or it may support a second type of partial coherence with 4 port groups (Part 3) and / or non-coherence with 8 port groups (Part 4).

[0086] For a UE that supports 8Tx with 8 port groups with non-coherent ports, it may support non-coherence (Part 4) with 8 port groups.

[0087] A port group corresponds to a panel. If two or more port groups are coherent, the precoder may be determined according to a compact precoder for one port group and one or more additional phase offsets.

[0088] In some embodiments, the UE determines a precoder for the full coherence level according to the number of port groups. In some embodiments, for one port group, the precoder is determined according to a first set of parameters. For example, the first set of parameters corresponds to a DL codebook-based scheme. For example, the first set of parameters includes at least one of the following: i1(i 1、1 , i 1、2 , i 1、3 , or i 1、4 , or values ​​of i2, N1, N2, O1, O2, codebookMode, etc. In some embodiments, for two or more port groups, the precoder is determined according to a second set of parameters. For example, the second set of parameters corresponds to a UL codebook-based scheme. For example, the second set of parameters includes at least one of the following: TPMI, or one or more phase offsets, i.e., co-phasing.

[0089] In some embodiments, the UE determines the precoder according to a port group indication. The port group indication (i.e., an indication of the number of port groups for the codebook indication) may be indicated in DCI, MAC CE, or RRC signaling and may indicate the number of port groups. In some embodiments, the port group indication is an indication of the number of port groups. For example, the indication of the number of port groups may be used to select a given number of port groups or more than one number of port groups from a set of port group numbers according to a configuration or according to a determined one or more numbers of port groups for the codebook indication.

[0090] The number of port groups may be one selected from a predetermined set of numbers, for example, the predetermined set of numbers may be the set (1, 2, 4, 8) or a portion of (1, 2, 4, 8). The set or portion may be determined according to a candidate port group indication, for example, via RRC signaling, MAC CE, or in a predetermined manner.

[0091] For example, if the predetermined set of numbers is the set of (1, 2, 4, 8) according to the candidate port group indication via RRC signaling, the port group indication field of the DCI may be 2 bits.

[0092] For example, if the predetermined set of numbers is a set of (1,2) according to the candidate port group indication via RRC signaling or MAC CE, the port group indication field of the DCI may be 1 bit.

[0093] For numbers of port groups of 1, 2, 4, and 8, the precoder instructions correspond to full coherence (Part 1 of Table 1), first type partial coherence (Part 2 of Table 1), second type partial coherence (Part 3 of Table 1), and non-coherence (Part 4 as described above), respectively.

[0094] For one port group corresponding to full coherence, one field of rank and TPMI / precoder may further be indicated.

[0095] For two port groups corresponding to the first type of partial coherence, two fields of rank and TPMI / precoder can be further indicated, each field having a rank and TPMI indication corresponding to a port group.

[0096] For the four port groups corresponding to the second type of partial coherence, four fields of rank and TPMI / precoder may further be indicated, each field having a rank and TPMI indication corresponding to a port group.

[0097] For eight port groups corresponding to non-coherence, eight rank fields can be further indicated, each field corresponding to a port group, or one field of rank combination indication is indicated.

[0098] For full coherence with DL Type I codebook and partial coherence with UL TPMI scheme (both types), the overhead of precoder indication is analyzed according to Table 4 below for the "joint indication of rank + TPMI per group" indication. [Table 4]

[0099] In some embodiments, for each port group, the number of Tx ports (configured Tx ports) should be the same; the coherence type should be the same; only fully coherent TPMI / precoder pairs can be indicated; the rank parameter is indicated separately; and a port group is disabled by rank=0 or null. For example, #1 rank value including 0 or null is jointly coded with TPMI, #2 is a separate RI indication including 0 or null for rank, or #3 is an RI combination including one or more ranks with "0 or null".

[0100] If two or more port groups are non-coherent, when determining the 8Tx precoder, a rank is indicated for each port group, and each port group with a layer rank number is not in the same layer (i.e., separate layers).

[0101] In some embodiments, to maintain a quadrature phase shift keying (QPSK) constellation, restrictions on N1, N2 and O1, O2 must be applied: N1*O1≦4, and N2*O2≦4. For example, if N1 or N2 is 4, then O1 or O2 can be 1, respectively. If N1 or N2 is 2, then O1 or O2 can be 1 or 2, respectively.

[0102] In some embodiments, the UE is configured with network values ​​of N1 and N2, where N1 and N2 represent the number of rows and columns of antenna elements in a panel (antenna panel), respectively. In the case where N1 or N2 has a value of 1, O1 or O2 is 1. In the case where N1 or N2 has a value of 2, O1 or O2 can be 1 or 2 depending on the network's instruction regarding oversampling (e.g., a bit indicating 1 or 2). In the case where N1 or N2 has a value of 4, O1 or O2 can be 1.

[0103] N1 is defined as the number of horizontal antenna elements on one polarization. N2 is defined as the number of vertical antenna elements on one polarization. O1 is defined as the value of the oversampling factor on one polarization in the horizontal direction. O2 is defined as the value of the oversampling factor on one polarization in the vertical direction. (Exemplary embodiment 2)

[0104] The exemplary embodiment relates to a method for reducing the number of candidates for a non-coherent codebook.

[0105] Regarding non-coherence (part 4 above), there are 255 cases with full flexibility for the non-coherent case. Compared to the number of precoders for full coherence, that number is very large, which causes high overhead.

[0106] To address this high overhead problem, the embodiments described below provide a reduction in the number of candidates for the non-coherent codebook.

[0107] 1) Antenna layout with 8 groups:

[0108] Full flexibility: 255 cases

[0109] Fixed starting Tx port (e.g. 0) + consecutive Tx ports: Number of cases: 8

[0110] Any starting Tx port + consecutive Tx ports: Number of cases: 8 + 7 + 6 + ··· + 2 + 1 = 36.

[0111] 2) Antenna layout with 4 groups:

[0112] Starting ports which can be from each port group (panel), e.g. {0,2,4,6}

[0113] +Number of consecutive rank values ​​for Tx port, number of cases: 8 + 6 + 4 + 2 = 20

[0114] Or + the number of "consecutive" rank values ​​of Tx ports with panel and / or polarization order, e.g. {0,2,4,6,1,3,5,7}, number of cases: 8+6+4+2=20 (from groups, or odd or even order)

[0115] 3) Antenna layout with two groups:

[0116] Starting ports, which can be from each port group (panel), e.g. {0,4,}

[0117] + Number of consecutive rank values ​​for Tx port, number of cases: 8 + 4 = 12

[0118] or + the number of "consecutive" rank values ​​of Tx ports with panel and / or polarization order, e.g. {0,4,2,6,1,3,5,7}, number of cases: 8+4=12

[0119] 4) Antenna layout by one group:

[0120] Fixed starting Tx port (e.g., 0) + consecutive or "consecutive" Tx ports: Number of cases: 8.

[0121] In some embodiments, a non-coherent 8-Tx codebook may be used for UEs with non-coherent UEs, partial+non-coherent UEs, and full+partial+non-coherent UEs.

[0122] A non-coherent 8-Tx codebook can be viewed as eight 1-port groups, each with rank 0 or 1, and no TPMI is required for each 1-port group. Considering full flexibility comparable to that of a fully coherent codebook, there are 255 codebooks. For an 8-Tx non-coherent codebook, such high flexibility may not be necessary due to the large overhead. To reduce the number of candidate non-coherent codebooks, the UE antenna layout can be considered.

[0123] For example, to select a port combination for a non-coherent codebook, the starting port index plus the "consecutive" port numbers can be considered. Assuming the UL8-Tx port indexing for 1 / 2 / 4 port groups as shown in Figure 2, the number of candidates is evaluated as shown in Table 5. For a UE supporting two port groups, the starting port can be port 0 or port 2. For starting port 0, according to the non-circular port order (0,4,1,5,2,6,3,7), it can support (0), (0,4), ... (0,4,1,5,2,6,3,7) for port selection from rank 1 to rank 8. For starting port 2, according to the non-circular port order (0,4,1,5,2,6,3,7), it can support (2), (2,6), ... (2,6,3,7) for port selection from rank 1 to rank 4. Therefore, the number of candidates for the non-coherent codebook for two port groups is 8 + 4 = 12.

[0124] According to the above rules, a maximum of 36 candidate codebooks are required. If the UE supports one port group, only eight candidates may be needed. The non-circular port order (0, 4, 1, 5, 2, 6, 3, 7) follows the rule that ports in fewer (converged) port groups are preferentially selected. If branched port groups are prioritized, the port order can also be replaced by another order. [Table 5]

[0125] In some embodiments, for non-coherent codebook design, several candidate non-coherent codebooks are determined by the UE and the network (eg, a node of the network) according to at least one of the following:

[0126] -Number of port groups

[0127] -Start port index limited depending on the number of port groups, for example

[0128] -Predefined port index order, e.g. (0,4,1,5,2,6,3,7)

[0129] For example, for one port group, the starting port may be port 0, and the non-coherent candidate codebook may have "consecutive" R=1 to 8 ports with a non-circular order, e.g., (0, 4, 1, 5, 2, 6, 3, 7) for ranks 1 to 8, respectively. The codebook for rank 1 is the selection of port 0, which means that the other ports, i.e., 1 to 7, are not selected. The codebook is W 8×1 =[1 0 0 0 0 0 0 0] T The codebook for rank 4 is the selection of ports 0, 4, 1, 5, which means that other ports, i.e., 2, 3, 6, 7, are not selected. The codebook can be Equation 3.

number

[0130] The codebook for rank 6 is the selection of ports 0, 4, 1, 5, 2, 6, which means that other ports, namely 3, 7, are not selected. The codebook can be Equation 4:

number

[0131] For example, for a two-port group, the starting port can be port 0 or 2, and the noncoherent candidate codebook can have "consecutive" R=1 to 8 ports with a noncircular order, e.g., (0, 4, 1, 5, 2, 6, 3, 7) for ranks 1 to 8, respectively. The codebook for rank 1 with starting port 0 is the selection of port 0, which means that the other ports, i.e., 1 to 7, are not selected. The codebook for rank 1 with starting port 2 is the selection of port 2, which means that the other ports, i.e., 0, 1, 3 to 7, are not selected. The codebook for rank 4 with starting port 0 is the selection of ports 0, 4, 1, 5, which means that the other ports, i.e., 2, 3, 6, 7, are not selected. The codebook for rank 4 with starting port 2 is the selection of ports 2, 6, 3, 7, which means that the other ports, i.e., 0, 4, 1, 5, are not selected.

[0132] Note that the above precoder is not normalized. In some embodiments, the precoder may need to multiply w by a ratio for normalization. (Exemplary embodiment 3)

[0133] The exemplary embodiments disclosed herein relate to a method for port index mapping.

[0134] According to the DL port indexing scheme, as shown in Fig. 3,

[0135] For 8Tx full coherence with one port group, ports 0, 1, 2, and 3 have the same polarization direction, and ports 4, 5, 6, and 7 have the same other polarization direction. They belong to one port group or panel.

[0136] For an 8-Tx full coherent configuration with two port groups, ports 0, 1, 2, and 3 belong to one port group or panel and are coherent. Ports 0 and 1 have the same polarization direction, and ports 2 and 3 have the same polarization direction in the other. Ports 4, 5, 6, and 7 belong to another port group or panel. Ports 4 and 5 have the same polarization direction, and ports 6 and 7 have the same polarization direction in the other.

[0137] For an 8-Tx full coherent system with four port groups, ports 0 and 1 belong to one port group or panel and are coherent with different polarization directions. Ports 2 and 3 belong to another port group or panel and are coherent with different polarization directions. Ports 4 and 5 belong to another port group or panel and are coherent with different polarization directions. Ports 6 and 7 belong to another port group or panel and are coherent with different polarization directions.

[0138] According to the UL port indexing scheme, as shown in Figure 4,

[0139] For 2Tx, it has the same port indexing for 1 port group and 2 port groups,

[0140] For 4Tx, it has the same port indexing for 1 port group and 2 port groups,

[0141] For UL8Tx, it can follow the UL port indexing rule or the DL port indexing rule. If UL8Tx follows the DL rule, the mapping between port index and port group cannot correspond to two groups with 4Tx and four groups with 2Tx. If it follows the UL rule, there is no reference for UL8Tx.

[0142] To address this issue in the UL port indexing scheme, the embodiments disclosed herein provide an enhanced port index mapping.

[0143] In some embodiments, the UL8Tx precoding port index follows at least one of the following rules:

[0144] -Polarization pairs are 0-4, 1-5, 2-6, 3-7.

[0145] -For partial coherence, 2 groups: one 4TX group with ports (0,1,2,3) and another 4TX group with ports (0,1,2,3) are mapped to 8TX(0,1,4,5,2,3,6,7) or 8TX(0,2,4,6,1,3,5,7).

[0146] -For partial coherence, 4 groups: 2TX groups 1, 2, 3, 4: port (0,1), port (0,1), port (0,1), port (0,1) are mapped to 8TX (0,4,1,5,2,6,3,7). (Example Operation)

[0147] As described herein, exemplary embodiments detail UE capability reporting and / or network configuration for identifying different modes (coherence and port group). Exemplary embodiments restrict candidate codebooks for port group indication overhead reduction. Exemplary embodiments reduce non-coherent codebook candidate overhead. Exemplary embodiments provide unified port indexing for UL8Tx with 1 / 2 / 4 port groups.

[0148] FIG. 5 shows an exemplary flow chart for network configuration of 8Tx transmit precoding.

[0149] At operation 502, a wireless communication device (eg, a UE) receives a configuration from a wireless communication node (eg, a base station) indicating at least one of a number of one or more port groups or one or more levels of coherence.

[0150] In operation 504, the wireless communication device determines a precoder for transmission according to the configuration.

[0151] In operation 506, the wireless communication device performs transmission using the precoder.

[0152] In some embodiments, the total number of ports is 8. For example, the total of 8 ports are divided into a given number of port groups (e.g., 1 port group, 2 port groups, 4 port groups, 8 port groups).

[0153] In some embodiments, the one or more number of port groups indicated by the configuration includes one or more of one port group, two port groups, four port groups, or eight port groups. In some embodiments, the one or more levels of coherence indicated by the configuration include one or more of full coherence, a first type of partial coherence, a second type of partial coherence, and no coherence. In some embodiments, the first type of partial coherence refers to all ports (e.g., eight ports) being divided into two port groups that are not coherent with each other, but ports within a given port group being coherent with each other. For example, the first type of partial coherence refers to Part 2 of Table 1. In some embodiments, the second type of partial coherence refers to all ports (e.g., eight ports) being divided into four port groups that are not coherent with each other, but ports within a given port group being coherent. For example, the second type of partial coherence refers to Part 3 of Table 1.

[0154] In some embodiments, the wireless communication device further transmits information indicating one or more supported numbers of port groups or one or more supported levels of coherence (e.g., capability information). In some embodiments, the wireless communication device transmits this capability information before receiving the configuration from the wireless communication node in operation 502.

[0155] In some embodiments, the indicated number of port groups or the indicated level of coherence is the highest capability, which indicates that one or more capabilities lower than the highest capability are configured (e.g., in the configuration received in operation 502) or supported (e.g., in the capability information transmitted to the network). For example, one or more given capabilities are selected from a remaining capability set having capabilities lower than the highest capability. The one or more given capabilities may have the highest or lowest capabilities within the remaining capability set. Assuming the highest capability is one port group, the given capability may be two port groups. Then, the capability of one port group may include one port group and two port groups. In some embodiments, the order of port group capabilities from highest to lowest is one port group, two port groups, four port groups, and eight port groups. In some embodiments, the order of coherence capabilities from highest to lowest is full coherence, a first type of partial coherence, a second type of partial coherence, and no coherence.

[0156] In some embodiments, determining a precoder for a transmission according to the configuration (e.g., in operation 504) includes determining the presence or size of an indication of the number of port groups for the codebook indication according to the configuration. The indication of the number of port groups may be used to select one number of port groups or two or more numbers of port groups from the set of numbers of port groups according to the configuration or according to the determined one or more numbers of port groups for the codebook indication.

[0157] In some embodiments, determining a precoder for transmission according to the configuration (e.g., at operation 504) includes determining a number of one or more port groups for the codebook indication and determining the presence or size of an indication of the number of port groups (e.g., a port group indication) according to the determined number of one or more port groups for the codebook indication. Thus, these embodiments provide for determining the range of candidate codebooks indicated by the DCI. The presence or size of the port group indication may be determined according to the determined number of one or more port groups for the codebook indication.

[0158] In some examples, the determined number of one or more port groups may be the number of one or more port groups received (e.g., in configuration). In other examples, the determined number of one or more port groups is different (e.g., inferred or determined via configuration). For example, a wireless communication device may receive only the number of one port group, but the number of one or more associated port groups, e.g., all lower function, all one or more port groups, is determined according to a predetermined rule.

[0159] For example, if only full coherence or only one port group is determined, the DCI does not include a port group indication but includes a rank (1-8) and a TPMI. The precoder may be determined according to the rank and TPMI in the DCI.

[0160] For example, if full coherence and the first type of partial coherence, or one port group and two port groups, are determined, the DCI includes a 1-bit "number of port groups indication" to indicate one port group or two port groups. Then, for each port group, there should be a set of rank and TPMI or parameters for determining the codebook. This means that there is one set of rank + TPMI for each port group.

[0161] The TPMI may be an index to indicate a codebook from a given set of codebooks, or a set of parameters to determine a codebook / precoder.

[0162] In some embodiments, determining a precoder for transmission according to the configuration includes determining a given number of port groups according to an indication of the number of port groups, and determining at least one of a rank, a number of layers, or a TPMI for each port group of the given number of port groups.

[0163] In some embodiments, determining a precoder for a transmission according to the configuration includes determining a given number of port groups according to an indication of the number of port groups, determining a phase between each two port groups of the given number of port groups, and determining at least one of a rank, a number of layers, or a TPMI for at least some of the port groups of the given number of port groups. In some embodiments, the indication of the number of port groups is included in DCI, MAC CE, or RRC signaling.

[0164] For example, if there are two port groups that are coherent, one phase is determined and one phase is received, for example, from the network via DCI or MAC CE. For example, if there are four port groups that are coherent, three phases are determined and they are received, for example, from the network via DCI or MAC CE. In this case, the rank and / or TPMI may be indicated for more than one of the given number of port groups, i.e., for all or a portion of the given number of port groups. In other words, the rank and / or TPMI may be shared for more than one of the given number of port groups. For example, in these embodiments, at least one of the rank or TPMI for at least some of the port groups is determined when all of the subgroups or ports are coherent.

[0165] In some embodiments, the precoder is determined from parameters of a downlink codebook-based scheme based on the one or more port groups being one port group, or the precoder is determined from parameters of an uplink codebook-based scheme based on the one or more port groups being two or more port groups that are coherent.

[0166] In some embodiments, the wireless communication device further determines a value of the oversampling factor for the polarization direction according to the number of antenna elements in the polarization direction. In some examples, the polarization direction includes a horizontal direction or a vertical direction.

[0167] In some embodiments, the configuration is received via one of radio resource control (RRC) signaling, a medium access control (MAC) control element, or a downlink control indicator (DCI).

[0168] In some embodiments, the precoder is determined based on at least one of a number of port groups, a starting port index, or a port index order. In some embodiments, determining the precoder based on at least one of the number of port groups, a starting port index, or a port index order includes determining the precoder from a set of codebooks determined based on at least one of the number of port groups, a starting port index, or a port index order. The set of codebooks includes codebooks each reflecting a certain port selection. When a port is selected, a vector of layers is determined having non-zero elements for that port and zero elements for other ports.

[0169] In some examples, the precoder is determined according to a level of non-coherence indicated by the configuration. In some embodiments, the precoder is determined based on a sequential number of port indices according to at least one of a number of port groups, a starting port index, or a port index order. In some embodiments, the starting port index is determined based on the number of port groups. In some embodiments, the port index order is one of {0, 4, 1, 5, 2, 6, 3, 7}, {0, 1, 2, 3, 4, 5, 6, 7}, {0, 2, 1, 3, 4, 6, 5, 7}, {0, 1, 4, 5, 2, 3, 6, 7}, or {0, 4, 2, 6, 1, 5, 3, 7}.

[0170] In some embodiments, the wireless communication device further maps ports of one or more port groups to ports of the precoder according to at least one of one or more predefined mappings, in some embodiments, the one or more predefined mappings include mapping two port groups, each having four ports, to ports {0,1,4,5,2,3,6,7} of the precoder or ports {0,2,4,6,1,3,5,7} of the precoder, or mapping four port groups, each having two ports, to ports {0,4,1,5,2,6,3,7} of the precoder.

[0171] FIG. 6 illustrates an exemplary flowchart relating to capability reporting for 8Tx transmit precoding.

[0172] In operation 602, a wireless communication node (eg, a base station) transmits a configuration to a wireless communication device indicating at least one of a number of one or more port groups or one or more levels of coherence.

[0173] In operation 604, the wireless communication node indicates to the wireless communication device an indication of the number of port groups or precoders for transmission according to the configuration. The transmission is then performed using the precoders. In some embodiments, the wireless communication node receives the transmission according to the precoders and decodes the transmission.

[0174] In some embodiments, the wireless communication node further determines the presence or size of an indication of the number of port groups for the codebook indication, and may use the indication of the number of port groups to select a given number of port groups (or two or more numbers of port groups based on the given number of port groups) from the set of port group numbers according to a configuration or according to the determined one or more numbers of port groups for the codebook indication.

[0175] In some embodiments, the total number of ports is 8. In some embodiments, the particular number of port groups is one of 1 port group, 2 port groups, 4 port groups, or 8 port groups. The particular level of coherence is one of full coherence, partial coherence of a first type, partial coherence of a second type, and no coherence.

[0176] In some embodiments, the wireless communication node further indicates the number of antenna elements in a polarization direction in the configuration.

[0177] In some embodiments, the number of port groups indicated or the level of coherence indicated is a maximum capability indicating that one or more capabilities lower than the maximum capability are configured or supported. In some embodiments, the order of port group capabilities from highest or lowest is one port group, two port groups, four port groups, and eight port groups. The order of coherence capabilities from highest to lowest is full coherence, partial coherence of a first type, partial coherence of a second type, and no coherence.

[0178] In some embodiments, the indication of the number of port groups is included in the DCI, MAC CE, or RRC signaling. In some embodiments, the wireless communication node further indicates the number of antenna elements for the polarization directions in the configuration.

[0179] In some embodiments, the wireless communication node transmits the configuration via one of the RRC, MAC CE, or DCI.

[0180] FIG. 7 shows an example block diagram of a hardware platform 700 that may be part of a network device (e.g., a base station) or a communication device (e.g., user equipment (UE)). The hardware platform 700 includes at least one processor 710 and a memory 705 having instructions stored thereon. The instructions executed by the processor 710 configure the hardware platform 700 to perform the operations described in FIGS. 1 through 4 and in various embodiments described in this patent document. The transmitter 715 transmits or sends information or data to other devices. For example, a network device transmitter may send a message to a user equipment. The receiver 720 receives information or data transmitted or sent by another device. For example, a user equipment may receive a message from a network device.

[0181] The implementation aspects described above apply to wireless communications. Figure 8 illustrates an example of a wireless communications system (e.g., a 5G or NR cellular network) including a base station 820 and one or more user equipment (UE) 811, 812, and 813. In some embodiments, the UE accesses a BS (e.g., a network) using a communication link to the network (indicated by dashed arrows 831, 832, and 833, sometimes referred to as the uplink direction), and the BS then enables subsequent communications from the BS to the UE (indicated by arrows 841, 842, and 843, sometimes referred to as the downlink direction). In some embodiments, the BS transmits information to the UE (indicated by arrows 841, 842, and 843, sometimes referred to as the downlink direction), and the UE then enables subsequent communications from the UE to the BS (indicated by dashed arrows 831, 832, and 833, sometimes referred to as the uplink direction). The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine-to-machine (M2M) device, an Internet of Things (IoT) device, etc.

[0182] The term "exemplary" is used herein to mean "one example," and does not refer to an ideal or preferred embodiment, unless expressly stated otherwise.

[0183] Some of the embodiments described herein are described in the general context of a method or process that may be implemented in one embodiment by a computer program product embodied in a computer-readable medium containing computer-executable instructions, such as program code, executed by computers in a network environment. Computer-readable media may include removable and non-removable storage devices, including, but not limited to, read-only memory (ROM), random access memory (RAM), compact discs (CDs), digital versatile discs (DVDs), and the like. Thus, computer-readable media may include non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer- or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

[0184] Some of the disclosed embodiments may be implemented as devices or modules using hardware circuits, software, or a combination thereof. For example, a hardware circuit implementation may include discrete analog and / or digital components integrated, for example, as part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as application-specific integrated circuits (ASICs) and / or field-programmable gate array (FPGA) devices. Some implementations may additionally or alternatively include a digital signal processor (DSP), which is a dedicated microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionality of the present application. Similarly, various components or subcomponents within each module may be implemented in software, hardware, or firmware. Connections between modules and / or components within a module may be provided using any one of the connection methods and mediums known in the art, including, but not limited to, communication via the Internet, wired, or wireless networks using appropriate protocols.

[0185] While this document contains many details, these should not be construed as limitations on the scope of the claimed invention or the invention that may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features described herein in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, while features may be described above as acting in a particular combination and initially claimed as such, one or more features from a claimed combination may, in some cases, be cut from the combination, and the claimed combination may be directed to a subcombination or a variation of the subcombination. Similarly, although operations are shown in the figures in a particular order, this should not be understood as requiring such operations to be performed in the particular order shown, or in any sequential order, or that all of the illustrated operations be performed, to achieve desirable results.

[0186] Only some implementations and examples have been described, and other implementations, enhancements, and variations may be made based on what is described and illustrated in this disclosure.

Claims

1. 1. A method for wireless communication, the method comprising: receiving, at a wireless device, from a wireless communication node, a configuration indicating at least one of one or more number of port groups for uplink transmission from the wireless device, wherein a total number of ports is eight; determining, at the wireless device, a precoder for uplink transmission according to the configuration, the precoder being determined from a set of candidate precoders, the set of candidate precoders being reduced by one or more rules specifying a predefined port index order and a starting port index for each candidate precoder in the set; performing, at the wireless device, the uplink transmission using the precoder; A method comprising:

2. 2. The method of claim 1, wherein the one or more number of port groups indicated by the configuration is one or more of one port group, two port groups, four port groups, or eight port groups.

3. The method of claim 1 , further comprising transmitting information to the wireless communication node indicating a number of one or more supported port groups.

4. 4. The method of claim 1, wherein the number of port groups indicated is a maximum capacity and indicates that one or more capacities lower than the maximum capacity are configured or supported, and the order of port group capacities from highest to lowest is one port group, two port groups, four port groups, and eight port groups.

5. determining a precoder for transmission in accordance with the configuration, 2. The method of claim 1, comprising determining at least one of a rank, a number of layers, or a transmit precoding matrix indicator (TPMI) for each port group of the at least one number of port groups indicated by the configuration.

6. The method of claim 5 , wherein the configuration is included in a DCI, a MAC CE, or RRC signaling.

7. 10. The method of claim 1, wherein the configuration is received via one of a radio resource control (RRC) signaling, a medium access control (MAC) control element, or a downlink control indicator (DCI).

8. 10. The method of claim 1, further comprising mapping ports of one or more port groups to ports of the precoder according to at least one of one or more predefined mappings.

9. The one or more predefined mappings include: a mapping of two port groups, each having four ports, to ports {0, 1, 4, 5, 2, 3, 6, 7} of the precoder; or Mapping of four port groups, each with two ports, to ports {0, 4, 1, 5, 2, 6, 3, 7} of the precoder The method of claim 8, comprising:

10. 1. A method for wireless communication, the method comprising: transmitting a configuration to a wireless communication device indicating at least one of one or more number of port groups for uplink transmission from the wireless communication device, wherein a total number of ports is eight; indicating to the wireless communication device an indication of a number of precoders or port groups for transmission according to the configuration, the precoders being determined from a set of candidate precoders, the set of candidate precoders being reduced by one or more rules specifying a predefined port index order and a starting port index for each candidate precoder in the set; A method comprising:

11. 11. The method of claim 10, wherein the one or more number of port groups comprises one or more of one port group, two port groups, four port groups, or eight port groups.

12. The method of any one of claims 10-11, wherein the number of port groups indicated is a maximum capacity and indicates that one or more capacities lower than said maximum capacity are supported or configured.

13. 13. The method of claim 12, wherein the order of port group capabilities from highest to lowest is one port group, two port groups, four port groups, and eight port groups.

14. The method of claim 10 , wherein the configuration is included in a DCI, a MAC CE, or RRC signaling.

15. The method of claim 10 , further comprising indicating a number of antenna elements for a polarization direction in the configuration.

16. 1. An apparatus for wireless communication, comprising: a memory; and a processor; wherein the processor implements a method by executing instructions stored on the memory; The method comprises: receiving a configuration from a wireless communication node indicating at least one of one or more number of port groups for uplink transmission from the wireless device, wherein a total number of ports is eight; determining a precoder for uplink transmission according to the configuration, the precoder being determined from a set of candidate precoders, the set of candidate precoders being reduced by one or more rules specifying a predefined port index order and a starting port index for each candidate precoder in the set; performing the uplink transmission using the precoder; and 1. An apparatus comprising:

17. 1. An apparatus for wireless communication, comprising: a memory; and a processor; wherein the processor implements a method by executing instructions stored on the memory; The method comprises: transmitting a configuration to a wireless communication device indicating at least one of one or more number of port groups for uplink transmission from the wireless communication device, wherein a total number of ports is eight; indicating to the wireless communication device an indication of a number of precoders or port groups for transmission according to the configuration, the precoders being determined from a set of candidate precoders, the set of candidate precoders being reduced by one or more rules specifying a predefined port index order and a starting port index for each candidate precoder in the set; 1. An apparatus comprising:

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