Beam management for physical uplink shared channels in dense deployments
A user equipment (UE) in a wireless network may receive Downlink Control Information (DCI) that schedules Physical Uplink Shared Channel (PUSCH) for non-codebook-based and/or codebook-based PUSCH operation. The UE may be configured with a Sounding Reference Signal (SRS) resource set for each codebook-based operation and non-code-book-based operation. The UE may transmit using a codebook base operation in a first set of PUSCH occasions and transmit using a non-code-book-based operation in a second set of PUSCH occasions. The DCI may include multiple SRS Resource Indicator (SRI) fields pertaining to different sets of PUSCH occasions. Similarly, DCI may include information pertaining to a number of layers for precoding for a set of PUSCH occasions.
1 . A User Equipment (UE), comprising:
communications circuitry capable of connecting to a wireless network,
a processor, and
a memory storing instructions which, when executed by the processor, cause the processor to:
receive one or more downlink transmissions comprising Radio Resource Control (RRC) signaling and Downlink Control Information (DCI) that schedules one or more Physical Uplink Shared Channels (PUSCHs),
wherein the RRC signaling indicates two Sounding Reference Signal (SRS) resource sets (SRSRS) including a first SRSRS and a second SRSRS,
wherein the DCI includes a 2-bit SRSRS selection field, a first SRS Resource Indicator (SRI) field, and a second SRI field for non-codebook-based and/or codebook-based PUSCH operation,
wherein the 2-bit SRSRS selection field indicates one of codepoint values of 0 to 3,
wherein the codepoint value of 0 indicates that the first SRI field is used to indicate the first SRSRS and that the second SRI field is unused,
wherein the codepoint value of 1 indicates that the first SRI field is used to indicate the second SRSRS and that the second SRI field is unused,
wherein the codepoint value of 2 indicates that the first SRI field is used to indicate the first SRSRS and that the second SRI field is used to indicate the second SRSRS,
wherein the codepoint value of 3 indicates that the first SRI field is used to indicate the first SRSRS and that the second SRI field is used to indicate the second SRSRS, and
wherein the first SRSRS corresponds to a lower ID than the second SRSRS; and
transmit, using the PUSCH repetition pattern and SRSRS selected based on the 2-bit SRSRS selection field, one or more PUSCH occasions.
2 . The UE of claim 1 , wherein the first SRSRS is for codebook-based operation and the second SRSRS is for non-codebook-based operation.
3 . The UE of claim 1 , wherein the DCI indicates the use of both the non-codebook-based PUSCH operation and the codebook-based PUSCH operation.
4 . The UE of claim 3 , wherein the instructions, when executed by the processor, further cause the apparatus to:
transmit PUSCH using a codebook-based operation in a first set of PUSCH occasions; and
transmit PUSCH using a non-codebook-based operation in a second set of PUSCH occasions.
5 . The UE of claim 4 ,
wherein the DCI includes a precoding and layers field pertaining to PUSCH precoding and a number of layers, and
wherein the precoding and layers field pertains to the first set of PUSCH occasions but not the second set of PUSCH occasions.
6 . The UE of claim 4 , wherein the first SRI field is applicable to the first set of PUSCH occasions and the second SRI field is applicable to the second set of PUSCH occasions.
7 . The UE of claim 6 , wherein the instructions, when executed by the processor, further cause the apparatus to determine, based on the second SRI field, a number of layers for PUSCH transmission in the first set of PUSCH occasions and the second set of PUSCH occasions.
8 . The UE of claim 7 , wherein the DCI includes a precoding field that pertains to precoding for the first set of PUSCH occasions based on the number of layers.
9 . The UE of claim 6 ,
wherein the DCI includes a precoding and layers field pertaining to precoding and a number of layers,
wherein the precoding pertains to the first set of PUSCH occasions but not the second set of PUSCH occasions, and
wherein the number of layers pertains to both the first and second sets of PUSCH occasions.
10 . The UE of claim 9 , wherein the second SRI field indicates a number of SRS resources that is equal to the number of layers indicated by the precoding and layers field.
11 . A method performed by a digital network, comprising:
sending a downlink transmission comprising Radio Resource Control (RRC) signaling and Downlink Control Information (DCI) that schedules one or more Physical Uplink Shared Channels (PUSCHs),
wherein the RRC signaling indicates two Sounding Reference Signal (SRS) resource sets (SRSRS) including a first SRSRS and a second SRSRS,
wherein the DCI includes a 2-bit SRSRS selection field, a first SRS Resource Indicator (SRI) field, and a second SRI field for non-codebook-based and/or codebook-based PUSCH operation,
wherein the 2-bit SRSRS selection field indicates one of codepoint values of 0 to 3,
wherein the codepoint value of 0 indicates that the first SRI field is used to indicate the first SRSRS and the second SRI field is unused,
wherein the codepoint value of 1 indicates that the first SRI field is used to indicate the second SRSRS and the second SRI field is unused,
wherein the codepoint value of 2 indicates that the first SRI field is used to indicate the first SRSRS and the second SRI field is used to indicate the second SRSRS,
wherein the codepoint value of 3 indicates that the first SRI field is used to indicate the first SRSRS and the second SRI field is used to indicate the second SRSRS, and
wherein the first SRSRS corresponds to a lower ID than the second SRSRS; and
receiving, using the PUSCH repetition pattern and SRSRS selected based on the 2-bit SRSRS selection field, one or more PUSCH occasions.
12 . The method of claim 11 , wherein the first SRSRS is for codebook-based operation and the second SRSRS is for non-codebook-based operation.
13 . The method of claim 11 , wherein the DCI indicates the use of both the non-codebook-based PUSCH operation and the codebook-based PUSCH operation.
14 . The method of claim 13 , further comprising:
receiving a first transmission from a User Equipment (UE) that is sent using a codebook-based operation in a first set of PUSCH occasions; and
receiving a second transmission from the UE that is sent using a non-codebook-based operation in a second set of PUSCH occasions.
15 . The method of claim 14 , wherein the first SRI field is applicable to the first set of PUSCH occasions and the second SRI field is applicable to the second set of PUSCH occasions.
16 . The method of claim 15 , wherein the second SRI field pertains to a first number of layers for the first set of PUSCH occasion and a second number of layers for the second set of PUSCH occasions.
17 . The method of claim 16 , wherein the DCI includes a precoding field that pertains to precoding for the first set of PUSCH occasions based on the first number of layers.
18 . The method of claim 15 ,
wherein the DCI includes a precoding and layers field pertaining to precoding and a number of layers,
wherein the precoding pertains to the first set of PUSCH occasions but not the second set of PUSCH occasions, and
wherein the number of layers pertains to both the first and second sets of PUSCH occasions.
19 . The method of claim 18 , wherein the second SRI field indicates a number of SRS resources that is equal to the number of layers indicated by the precoding and layers field.
20 . The method of claim 14 ,
wherein the DCI includes a first field pertaining to precoding and a number of layers, and
wherein the first field pertains to the first set of PUSCH occasions but not the second set of PUSCH occasions.