Soft-combining for hybrid automatic repeat request feedback
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may transmit, to a group of user equipment (UEs), a multi-user packet including a plurality of transport blocks combined into a combined transport block, wherein each transport block, of the plurality of transport blocks, is separately encoded using a particular encoding procedure and aggregated into the combined transport block; receive, from one or more UEs of the group of UEs, hybrid automatic repeat request feedback indicating a decoding failure of one or more transport blocks of the multi-user packet; and retransmit one or more packets to convey the one or more transport blocks subject to the decoding failure. Numerous other aspects are provided.
1 . A method of wireless communication performed by a network entity, comprising:
transmitting, to a group of user equipments (UEs), a multi-user packet including a plurality of transport blocks combined into a combined transport block, wherein each transport block, of the plurality of transport blocks, is separately encoded using a first encoding technique and aggregated into the combined transport block, and wherein a plurality of sub-headers corresponding to the plurality of transport blocks are jointly encoded as a set using a second encoding technique that is distinct from the first encoding technique;
receiving, from one or more UEs of the group of UEs, hybrid automatic repeat request (HARQ) feedback indicating a decoding failure of one or more transport blocks of the multi-user packet; and
retransmitting one or more packets to convey the one or more transport blocks subject to the decoding failure.
2 . The method of claim 1 , wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a physical downlink shared channel with which the multi-user packet is conveyed.
3 . The method of claim 1 , wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a sub-header set associated with the plurality of sub-headers.
4 . The method of claim 1 , wherein the second encoding technique comprises polar encoding.
5 . The method of claim 1 , wherein the first encoding technique comprises low-density parity check codes.
6 . The method of claim 1 , wherein retransmitting the one or more packets comprises:
retransmitting the one or more packets and refraining from including new transport blocks in a retransmission that includes the one or more packets.
7 . The method of claim 1 ,
wherein the one or more packets include a single packet; and
wherein retransmitting the one or more packets comprises:
retransmitting the single packet via a unicast transmission.
8 . The method of claim 1 ,
wherein downlink control information transmitted in connection with the multi-user packet includes information for at least one of:
a frequency domain resource assignment,
a time domain resource assignment,
a hybrid automatic repeat request process identifier,
a modulation and coding scheme,
a new data indicator,
a redundancy version, or
a downlink assignment index.
9 . The method of claim 1 , wherein downlink control information transmitted in connection with the multi-user packet includes information identifying a size or set of resources for a sub-header set associated with the plurality of sub-headers.
10 . The method of claim 1 ,
wherein a size of a first transport block of the plurality of transport blocks of the multi-user packet is equal to a size of a second transport block of the one or more transport blocks subject to the decoding failure and included in the one or more packets.
11 . The method of claim 1 ,
wherein retransmitting the one or more packets comprises:
retransmitting the one or more packets with the one or more transport blocks subject to the decoding failure and with one or more new transport blocks for one or more UEs of the group of UEs in a retransmission.
12 . The method of claim 11 ,
wherein the retransmission includes a new data indicator to enable the one or more UEs to identify the one or more new transport blocks.
13 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving a multi-user packet including a plurality of transport blocks combined into a combined transport block, wherein each transport block, of the plurality of transport blocks, is separately encoded using a first encoding technique and aggregated into the combined transport block, and wherein a plurality of sub-headers corresponding to the plurality of transport blocks are jointly encoded as a set using a second encoding technique that is distinct from the first encoding technique;
transmitting hybrid automatic repeat request (HARQ) feedback indicating a decoding failure of a particular transport block of the multi-user packet; and
receiving a retransmission of one or more packets to convey one or more transport blocks, including the particular transport block, subject to one or more respective decoding failures.
14 . The method of claim 13 , wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a physical downlink shared channel with which the multi-user packet is conveyed.
15 . The method of claim 13 ,
wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a sub-header set associated with the plurality of sub-headers.
16 . The method of claim 13 , wherein the second encoding technique comprises polar encoding.
17 . The method of claim 13 , wherein the first encoding technique comprises low-density parity check codes.
18 . The method of claim 13 ,
wherein receiving the one or more packets comprises:
receiving the one or more packets and refraining from including new transport blocks in a retransmission that includes the one or more packets.
19 . The method of claim 13 ,
wherein the one or more packets include a single packet; and
wherein receiving the one or more packets comprises:
receiving the single packet via a unicast transmission.
20 . The method of claim 13 ,
wherein downlink control information received in connection with the multi-user packet includes information for at least one of:
a frequency domain resource assignment,
a time domain resource assignment,
a hybrid automatic repeat request process identifier,
a modulation and coding scheme,
a new data indicator,
a redundancy version, or
a downlink assignment index.
21 . The method of claim 13 ,
wherein downlink control information received in connection with the multi-user packet includes information identifying a size or set of resources for a sub-header set associated with the plurality of sub-headers.
22 . The method of claim 13 ,
wherein a size of a first transport block of the plurality of transport blocks of the multi-user packet is equal to a size of a second transport block of the one or more transport blocks subject to the decoding failure and included in the one or more packets.
23 . A network entity for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to:
transmit, to a group of user equipments (UEs), a multi-user packet including a plurality of transport blocks combined into a combined transport block, wherein each transport block, of the plurality of transport blocks, is separately encoded using a first encoding technique and aggregated into the combined transport block, and wherein a plurality of sub-headers corresponding to the plurality of transport blocks are jointly encoded as a set using a second encoding technique that is distinct from the first encoding technique;
receive, from one or more UEs of the group of UEs, hybrid automatic repeat request (HARQ) feedback indicating a decoding failure of one or more transport blocks of the multi-user packet; and
retransmit one or more packets to convey the one or more transport blocks subject to the decoding failure.
24 . The network entity of claim 23 ,
wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a physical downlink shared channel with which the multi-user packet is conveyed.
25 . The network entity of claim 23 ,
wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a sub-header set associated with the plurality of sub-headers.
26 . The network entity of claim 23 , wherein the first encoding technique comprises low-density parity check codes, and wherein the second encoding technique comprises polar encoding.
27 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to:
receive a multi-user packet including a plurality of transport blocks combined into a combined transport block, wherein each transport block, of the plurality of transport blocks, is separately encoded using a first encoding technique and aggregated into the combined transport block, and wherein a plurality of sub-headers corresponding to the plurality of transport blocks are jointly encoded as a set using a second encoding technique that is distinct from the first encoding technique;
transmit hybrid automatic repeat request (HARQ) feedback indicating a decoding failure of a particular transport block of the multi-user packet; and
receive a retransmission of one or more packets to convey one or more transport blocks, including the particular transport block, subject to one or more respective decoding failures.
28 . The UE of claim 27 ,
wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a physical downlink shared channel with which the multi-user packet is conveyed.
29 . The UE of claim 27 ,
wherein downlink control information, of a physical downlink control channel, associated with the multi-user packet includes information identifying one or more parameters of a sub-header set associated with the plurality of sub-headers.
30 . The UE of claim 27 , wherein the first encoding technique comprises low-density parity check codes, and wherein the second encoding technique comprises polar encoding.