SYSTEM AND METHOD FOR UE PROCESSING TIME RELAXATION FOR MULTI-TRP TRANSMISSION
Systems, devices, and techniques for adjusting a user equipment (UE) processing time parameter in a wireless communication system that include transmission and reception points (TRPs) are described. A described technique performed by UE includes receiving a first physical downlink shared channel (PDSCH) from a first TRP corresponding to a first scheduling physical downlink control channel (PDCCH) and a second PDSCH from a second TRP corresponding to a second scheduling PDCCH. The technique further includes transmitting a first hybrid automatic repeat request acknowledgement (HARQ-ACK) message and a second HARQ-ACK message based on the first PDSCH and the second PDSCH in accordance with a first processing time parameter and a second processing time parameter, respectively. The first processing time parameter can be based on a PDSCH mapping type, a processing capability of the UE, and one or more timing characteristics of the first PDSCH and the second PDSCH.
1 . A method comprising:
receiving a first physical downlink shared channel (PDSCH) from a first transmission and reception point (TRP) and a second PDSCH from a second TRP, wherein the first PDSCH and the second PDSCH overlap at least partially in time and correspond to different physical downlink control channels (PDCCHs); and
transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK) message in accordance with a processing time parameter,
wherein the processing time parameter is based at least in part on a PDSCH mapping type, a processing capability of a user equipment (UE), and whether the first PDSCH is longer than seven symbols.
2 . The method of claim 1 , wherein the first PDSCH ends earlier in time than the second PDSCH, and the processing time parameter is based on a relative difference in durations of the first PDSCH and the second PDSCH.
3 . The method of claim 1 , wherein the processing time parameter is based on a number of overlapping symbols of the first PDSCH and a first PDCCH scheduling the first PDSCH.
4 . The method of claim 3 , wherein the processing time parameter is based on a number of overlapping symbols of the second PDSCH and a second PDCCH scheduling the second PDSCH.
5 . The method of claim 4 , wherein the first PDSCH and the second PDSCH are fully overlapped.
6 . The method of claim 1 , wherein the processing time parameter is based on a number of symbols allocated to the first PDSCH.
7 . The method of claim 1 , wherein the processing time parameter is adjusted based on whether the second PDSCH is longer than seven symbols.
8 . An apparatus comprising:
one or more processors; and
memory storing instructions that, when executed, cause the one or more processors to perform operations comprising:
receiving a first physical downlink shared channel (PDSCH) from a first transmission and reception point (TRP) and a second PDSCH from a second TRP, wherein the first PDSCH corresponds to a first scheduling physical downlink control channel (PDCCH) and the second PDSCH corresponds to a second scheduling PDCCH, and wherein the first PDSCH and the second PDSCH overlap at least partially in time; and
transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK) message in accordance with a processing time parameter, wherein the processing time parameter is based at least in part on a number of overlapping symbols of the first scheduling PDCCH and the corresponding first PDSCH.
9 . The apparatus of claim 8 , wherein the first PDSCH ends earlier in time than the second PDSCH, and the processing time parameter is based on a relative difference in durations of the first PDSCH and the second PDSCH.
10 . The apparatus of claim 8 , wherein the processing time parameter is based on a number of overlapping symbols of the second PDSCH and the corresponding second PDCCH.
11 . The apparatus of claim 10 , wherein the first PDSCH and the second PDSCH are fully overlapped.
12 . The apparatus of claim 8 , wherein the processing time parameter is based on a number of symbols allocated to the first PDSCH.
13 . The apparatus of claim 8 , wherein the processing time parameter is based on a PDSCH mapping type, a processing capability of a user equipment (UE), and wherein the processing time parameter is adjusted based on whether the first PDSCH is longer than seven symbols.
14 . The apparatus of claim 13 , wherein the processing time parameter is adjusted based on whether the second PDSCH is longer than seven symbols.
15 . A system comprising:
one or more processors; and
memory storing instructions that, when executed, cause the one or more processors to perform operations comprising:
transmitting a first physical downlink shared channel (PDSCH) corresponding to a first transmission and reception point (TRP), wherein the first PDSCH overlap at least partially in time with a second PDSCH corresponding to a second TRP, and wherein the first PDSCH and the second PDSCH correspond to different physical downlink control channels (PDCCHs); and
receiving a hybrid automatic repeat request acknowledgement (HARQ-ACK) message from a user equipment (UE), wherein the HARQ-ACK message is generated in accordance with a processing time parameter that is based at least in part on a PDSCH mapping type, a processing capability of the UE, and whether the first PDSCH is longer than seven symbols.
16 . The system of claim 15 , wherein the first PDSCH ends earlier in time than the second PDSCH, and the processing time parameter is based on a relative difference in durations of the first PDSCH and the second PDSCH.
17 . The system of claim 15 , wherein the processing time parameter is based on a number of overlapping symbols of the first PDSCH and a first PDCCH scheduling the first PDSCH.
18 . The system of claim 17 , wherein the processing time parameter is based on a number of overlapping symbols of the second PDSCH and a second PDCCH scheduling the second PDSCH.
19 . The system of claim 15 , wherein the processing time parameter is based on a number of symbols allocated to the first PDSCH.
20 . The system of claim 15 , wherein the processing time parameter is adjusted based on whether the second PDSCH is longer than seven symbols.