Interlaced physical sidelink feedback channel (PSFCH) mapping
A method of wireless communication performed by a first wireless communication device includes: receiving, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and transmitting, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication, wherein the transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets.
1 . A method of wireless communication performed by a first wireless communication device, the method comprising:
receiving, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
transmitting, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets;
wherein the first SL resources comprise a first plurality of interlaces of RBs and a first plurality of RB-sets, the first plurality of interlaces of RBs comprising the first interlace of RBs and the first plurality of RB-sets comprising the one or more first RB-sets; and
wherein the second SL resources comprise a second plurality of interlaces of RBs in the first plurality of RB-sets, the second plurality of interlaces of RBs comprising the second interlace of RBs.
2 . The method of claim 1 , wherein a number of interlaces of RBs of the second plurality of interlaces of RBs is equal to a number of interlaces of RBs of the first plurality of interlaces of RBs.
3 . The method of claim 2 , wherein the mapping is based on the first slot and the second slot, and wherein the mapping comprises a mapping of the first SL feedback communication to a first cyclic shift (CS) pair set within the second interlace of RBs, and a mapping of the second SL feedback communication to a second CS pair set within the second interlace of RBs.
4 . The method of claim 2 , wherein:
the one or more first RB-sets comprises two or more first RB-sets;
the receiving the first SL communication and the second SL communication comprises receiving the first SL communication and the second SL communication in the two or more first RB-sets;
the mapping of the first SL communication and the second SL communication is a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the two or more first RB-sets.
5 . The method of claim 2 , wherein:
the one or more first RB-sets comprises a first RB-set;
the first SL communication and the second SL communication are received in the first RB-set;
the mapping of the first SL communication and the second SL communication is a mapping of the first SL communication and the second SL communication to the second interlace in the first RB-set.
6 . The method of claim 1 , wherein a number of interlaces of RBs of the second plurality of interlaces of RBs is smaller than a number of interlaces of RBs of the first plurality of interlaces of RBs.
7 . The method of claim 6 , wherein the second SL resources comprise a plurality of cyclic shift (CS) pairs, and wherein the mapping is based on a partitioning of the plurality of CS pairs into a plurality of CS pair sets, and wherein the partitioning of the plurality of CS pairs is based on a number of interlaces of RBs of the first plurality of interlaces of RBs and a number of slots of the first SL resources.
8 . The method of claim 7 , wherein a size of each CS pair set of the plurality of CS pair sets is based on a number of CS pairs within the second interlace of RBs and a number of slots in the first SL resources.
9 . A non-transitory, computer-readable medium having program code recorded thereon, wherein the program code comprises instructions executable by a processor of a first wireless communication device to cause the first wireless communication device to:
receive, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
transmit, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets;
wherein the second interlace of RBs within one or more first RB-sets comprises a plurality of cyclic shift (CS) pairs, wherein the mapping is based on a hashing of the first interlace of RBs and the first slot within the plurality of CS pairs.
10 . A method of wireless communication performed by a first wireless communication device, the method comprising:
receiving, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
transmitting, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets; and
wherein the second interlace of RBs within the one or more first RB-sets comprises a plurality of cyclic shift (CS) pairs, wherein the mapping is based on a hashing of the first interlace of RBs and the first slot within the plurality of CS pairs.
11 . The method of claim 10 , wherein the receiving the first SL communication and the second SL communication comprises receiving the first SL communication and the second SL communication from a second UE, and wherein the hashing is based on an identifier of the second UE and a groupcast identifier.
12 . The method of claim 11 , wherein the hashing is further based on a number of CS pairs of the plurality of CS pairs.
13 . A first wireless communication device, comprising:
a memory;
a transceiver; and
a processor in communication with the memory and the transceiver, wherein the first wireless communication device is configured to:
receive, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
transmit, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets;
wherein the first SL resources comprise a first plurality of interlaces of RBs and a first plurality of RB-sets, the first plurality of interlaces of RBs comprising the first interlace of RBs and the first plurality of RB-sets comprising the one or more first RB-sets; and
wherein the second SL resources comprise a second plurality of interlaces of RBs in the first plurality of RB-sets, the second plurality of interlaces of RBs comprising the second interlace of RBs.
14 . The first wireless communication device of claim 13 , wherein a number of interlaces of RBs of the second plurality of interlaces of RBs is equal to a number of interlaces of RBs of the first plurality of interlaces of RBs.
15 . The first wireless communication device of claim 14 , wherein the mapping is based on the first slot and the second slot, and wherein the mapping comprises a mapping of the first SL feedback communication to a first cyclic shift (CS) pair set within the second interlace of RBs, and a mapping of the second SL feedback communication to a second CS pair set within the second interlace of RBs.
16 . The first wireless communication device of claim 14 , wherein:
the one or more first RB-sets comprises two or more first RB-sets;
the first wireless communication device is configured to receive the first SL communication and the second SL communication in the two or more first RB-sets; and
the mapping of the first SL communication and the second SL communication is a mapping of the first SL communication and the second SL communication to the second interlace in the two or more first RB-sets.
17 . The first wireless communication device of claim 14 , wherein:
the one or more first RB-sets comprises a first RB-set;
the first wireless communication device is configured to receive the first SL communication and the second SL communication in the first RB-set; and
the mapping of the first SL communication and the second SL communication is a mapping of the first SL communication and the second SL communication to the second interlace in the first RB-set.
18 . The first wireless communication device of claim 13 , wherein a number of interlaces of RBs of the second plurality of interlaces of RBs is smaller than a number of interlaces of RBs of the first plurality of interlaces of RBs.
19 . The first wireless communication device of claim 18 , wherein the second SL resources comprise a plurality of cyclic shift (CS) pairs, and wherein the mapping is based on a partitioning of the plurality of CS pairs into a plurality of CS pair sets, and wherein the partitioning of the plurality of CS pairs is based on a number of interlaces of RBs of the first plurality of interlaces of RBs and a number of slots of the first SL resources.
20 . The first wireless communication device of claim 19 , wherein a size of each CS pair set of the plurality of CS pair sets is based on a number of CS pairs within the second interlace of RBs and a number of slots in the first SL resources.
21 . A first wireless communication device, comprising:
means for receiving, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
means for transmitting, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the means for transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets;
wherein the first SL resources comprise a first plurality of interlaces of RBs and a first plurality of RB-sets, the first plurality of interlaces of RBs comprising the first interlace of RBs and the first plurality of RB-sets comprising the one or more first RB-sets; and
wherein the second SL resources comprise a second plurality of interlaces of RBs in the first plurality of RB-sets, the second plurality of interlaces of RBs comprising the second interlace of RBs.
22 . A first wireless communication device, comprising:
a memory;
a transceiver; and
a processor in communication with the memory and the transceiver, wherein the first wireless communication device is configured to:
receive, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
transmit, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets;
wherein the second interlace of RBs within the one or more first RB-sets comprises a plurality of cyclic shift (CS) pairs, wherein the mapping is based on a hashing of the first interlace of RBs and the first slot within the plurality of CS pairs.
23 . The first wireless communication device of claim 22 , wherein the first wireless communication device is configured to receive the first SL communication and the second SL communication from a second UE, and wherein the hashing is based on an identifier of the second UE and a groupcast identifier.
24 . The first wireless communication device of claim 23 , wherein the hashing is further based on a number of CS pairs of the plurality of CS pairs.
25 . A non-transitory, computer-readable medium having program code recorded thereon, wherein the program code comprises instructions executable by a processor of a first wireless communication device to cause the first wireless communication device to:
receive, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
transmit, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets;
wherein the first SL resources comprise a first plurality of interlaces of RBs and a first plurality of RB-sets, the first plurality of interlaces of RBs comprising the first interlace of RBs and the first plurality of RB-sets comprising the one or more first RB-sets; and
wherein the second SL resources comprise a second plurality of interlaces of RBs in the first plurality of RB-sets, the second plurality of interlaces of RBs comprising the second interlace of RBs.
26 . A first wireless communication device, comprising:
means for receiving, in first sidelink (SL) resources of a shared frequency band comprising a first interlace of resource blocks (RBs) within one or more first RB-sets, a first SL communication in a first slot and a second SL communication in a second slot; and
means for transmitting, in second SL resources of the shared frequency band comprising the one or more first RB-sets and a second interlace of RBs, a first SL feedback communication for the first SL communication and a second SL feedback communication for the second SL communication,
wherein the means for transmitting the first SL feedback communication and the second SL feedback communication is based on a mapping of the first SL communication and the second SL communication to the second interlace of RBs in the one or more first RB-sets;
wherein the second interlace of RBs within one or more first RB-sets comprises a plurality of cyclic shift (CS) pairs, wherein the mapping is based on a hashing of the first interlace of RBs and the first slot within the plurality of CS pairs.