PSCCH and PSSCH transmission on contiguous RB sets in SL-U
The present disclosure provides solutions to sidelink transmission/reception problems by preparing waveforms for multiple resource blocks (RBs) in a given bandwidth. Upon determining the availability of RBs or sets of RBs the apparatuses and methods of the present disclosure allow for dynamic determination and use of available sidelink frequencies. An apparatus may comprise a memory and at least one processor coupled to the memory and configured to transmit and/or receive sidelink data in at least one contiguous set of RBs within a bandwidth part (BWP) of an unlicensed frequency band, the BWP including a plurality of RB sets, wherein the SL data is transmitted and/or received in a waveform generated for at least one of the plurality of RB sets prior to a listen-before-talk procedure indicating an availability of the at least one contiguous set of RBs for transmission.
1 . An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
generate a plurality of waveforms, each of the waveforms generated for a respective number of one or more contiguous resource block (RB) sets of a plurality of RB sets included in a bandwidth part (BWP) of an unlicensed frequency band, the plurality of waveforms generated prior to obtaining an indication of availability of at least one contiguous set of RBs in the plurality of RB sets for transmission of the SL sidelink (SL) data, the indication obtained from a listen-before-talk (LBT) procedure; and
transmit the SL data in a selected waveform of the plurality of waveforms, the selected waveform corresponding to the at least one contiguous set of RBs that has been indicated as available by the LBT procedure.
2 . The apparatus of claim 1 , wherein each of the plurality of RB sets includes a physical sidelink control channel (PSCCH) candidate resource.
3 . The apparatus of claim 2 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, and the at least one processor is further configured to:
transmit a PSCCH in an initial RB set of the multiple, contiguous RB sets.
4 . The apparatus of claim 2 , wherein the at least one processor is further configured to:
transmit an interlaced PSCCH in the at least one contiguous set of RBs,
wherein an interlace of the interlaced PSCCH is relative to an initial RB of the at least one contiguous set of RBs.
5 . The apparatus of claim 2 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, and the at least one processor is further configured to:
transmit an interlaced PSCCH in one of the multiple, contiguous RB sets,
wherein an interlace of the interlaced PSCCH omits RBs in a guard band between adjacent ones of the multiple, contiguous RB sets.
6 . The apparatus of claim 1 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, the SL data is transmitted in a physical sidelink shared channel (PSSCH), and the PSSCH spans the multiple, contiguous RB sets.
7 . The apparatus of claim 6 , wherein the at least one processor is further configured to:
transmit an indication in sidelink control information (SCI) of a frequency domain resource assignment (FDRA) of the PSSCH spanning the multiple, contiguous RB sets, wherein the indication of the FDRA is irrespective of the plurality of RB sets from which the multiple, contiguous RB sets are based.
8 . The apparatus of claim 7 , wherein the FDRA is relative to an initial RB in an initial RB set of the multiple, contiguous RB sets.
9 . The apparatus of claim 6 , wherein the PSSCH includes RBs within a guard band between adjacent ones of the multiple, contiguous RB sets.
10 . The apparatus of claim 6 , wherein the PSSCH is an interlaced PSSCH, and an interlace of the interlaced PSSCH is relative to an initial RB of an initial RB set of the multiple, contiguous RB sets.
11 . The apparatus of claim 6 , wherein the PSSCH is an interlaced PSSCH, and an interlace of the interlaced PSSCH is irrespective of the plurality of RB sets from which the multiple, contiguous RB sets are based.
12 . A method of wireless communication at a sidelink entity, comprising:
generating a plurality of waveforms, each of the waveforms generated for a respective number of one or more contiguous resource block (RB) sets of a plurality of RB sets included in a bandwidth part (BWP) of an unlicensed frequency band, the plurality of waveforms generated prior to obtaining an indication of availability of at least one contiguous set of RBs in the plurality of RB sets for transmission of sidelink (SL) data, the indication obtained from a listen-before-talk (LBT) procedure; and
transmitting the SL data in a selected waveform of the plurality of waveforms, the selected waveform corresponding to the at least one contiguous set of RBs that has been indicated as available by the LBT procedure.
13 . The method of claim 12 , wherein each of the plurality of RB sets includes a physical sidelink control channel (PSCCH) candidate resource.
14 . The method of claim 13 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, and further comprising:
transmitting a PSCCH in an initial RB set of the multiple, contiguous RB sets.
15 . The method of claim 13 , further comprising:
transmitting an interlaced PSCCH in the at least one contiguous set of RBs, wherein an interlace of the interlaced PSCCH is relative to an initial RB of the at least one contiguous set of RBs.
16 . An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
monitor a resource pool spanning a plurality of resource block (RB) sets in a bandwidth part (BWP) of an unlicensed frequency band; and
receive sidelink (SL) data in a waveform corresponding to at least one contiguous set of RBs of the plurality of RB sets, the waveform being from a plurality of generated waveforms each having been generated for a respective number of one or more contiguous RB sets of the plurality of RB sets prior to an indication from a listen-before-talk (LBT) procedure of an availability of the at least one contiguous set of RBs for transmission of the SL data.
17 . The apparatus of claim 16 , wherein each of the plurality of RB sets includes a physical sidelink control channel (PSCCH) candidate resource.
18 . The apparatus of claim 17 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, and the at least one processor is further configured to:
receive a PSCCH in an initial RB set of the multiple, contiguous RB sets.
19 . The apparatus of claim 17 , wherein the at least one processor is further configured to:
receive an interlaced PSCCH in the at least one contiguous set of RBs,
wherein an interlace of the interlaced PSCCH is relative to an initial RB of the at least one contiguous set of RBs.
20 . The apparatus of claim 17 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, and the at least one processor is further configured to:
receive an interlaced PSCCH in one of the multiple, contiguous RB sets,
wherein an interlace of the interlaced PSCCH omits RBs in a guard band between adjacent ones of the multiple, contiguous RB sets.
21 . The apparatus of claim 16 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, the SL data is received in a physical sidelink shared channel (PSSCH), and the PSSCH spans the multiple, contiguous RB sets.
22 . The apparatus of claim 21 , wherein the at least one processor is further configured to:
receive an indication in sidelink control information (SCI) of a frequency domain resource assignment (FDRA) of the PSSCH spanning the multiple, contiguous RB sets, wherein the indication of the FDRA is irrespective of the plurality of RB sets from which the multiple, contiguous RB sets are based.
23 . The apparatus of claim 22 , wherein the FDRA is relative to an initial RB in an initial RB set of the multiple, contiguous RB sets.
24 . The apparatus of claim 21 , wherein the PSSCH includes RBs within a guard band between adjacent ones of the multiple, contiguous RB sets.
25 . The apparatus of claim 21 , wherein the PSSCH is an interlaced PSSCH, and an interlace of the interlaced PSSCH is relative to an initial RB of an initial RB set of the multiple, contiguous RB sets.
26 . The apparatus of claim 21 , wherein the PSSCH is an interlaced PSSCH, and an interlace of the interlaced PSSCH is irrespective of the plurality of RB sets from which the multiple, contiguous RB sets are based.
27 . A method of wireless communication at a sidelink entity, comprising:
monitoring a resource pool spanning a plurality of resource block (RB) sets in a bandwidth part (BWP) of an unlicensed frequency band; and
receiving sidelink (SL) data in a waveform corresponding to at least one contiguous set of RBs of the plurality of RB sets, the waveform being from a plurality of generated waveforms each having been generated for a respective number of one or more contiguous RB sets of the plurality of RB sets prior to an indication from a listen-before-talk (LBT) procedure of an availability of the at least one contiguous set of RBs for transmission of the SL data.
28 . The method of claim 27 , wherein each of the plurality of RB sets includes a physical sidelink control channel (PSCCH) candidate resource.
29 . The method of claim 28 , wherein the at least one contiguous set of RBs includes multiple, contiguous RB sets, and further comprising:
receiving a PSCCH in an initial RB set of the multiple, contiguous RB sets.
30 . The method of claim 28 , further comprising:
receiving an interlaced PSCCH in the at least one contiguous set of RBs,
wherein an interlace of the interlaced PSCCH is relative to an initial RB of the at least one contiguous set of RBs.