Sidelink radio resources on shared spectrum
A first wireless device may communicate with a second wireless device using sidelink resources. For a sidelink transmission on a shared spectrum, a quantity of subchannels of a sidelink resource pool (RP) may be used for indicating a resource block (RB) interlace.
1 . A method comprising:
receiving, by a first wireless device, at least one message comprising an interlace coefficient associating a quantity of resource block (RB) interlaces in a sidelink resource pool (RP) with a quantity of sub-channels;
selecting, based on the quantity of RB interlaces in the sidelink RP, one or more RBs from the sidelink RP for at least one sidelink transmission; and
transmitting, to at least one second wireless device, the at least one sidelink transmission based on the selected one or more RBs from the sidelink RP.
2 . The method of claim 1 , wherein the at least one message further indicates a first quantity of subchannels of the sidelink RP.
3 . The method of claim 1 , wherein the selecting is further based on a second quantity of subchannels, wherein the second quantity is a subquantity of a first quantity of subchannels indicated by the at least one message.
4 . The method of claim 1 , wherein the at least one message comprises at least one of:
a radio resource control (RRC) message;
a medium access control control element (MAC CE);
downlink control information (DCI); or
sidelink control information (SCI).
5 . The method of claim 1 , wherein the sidelink RP is in a sidelink bandwidth part (BWP) on a shared spectrum configured for a plurality of radio access technologies (RATs).
6 . The method of claim 1 , wherein the at least one sidelink transmission comprises at least one of:
a physical sidelink control channel (PSCCH);
a physical sidelink shared channel (PSSCH); or
a physical sidelink feedback channel (PSFCH).
7 . The method of claim 1 , wherein the at least one sidelink transmission comprises at least one of:
a unicast transmission;
a groupcast transmission; or
a broadcast transmission.
8 . The method of claim 1 , wherein the first wireless device is a coordinating wireless device performing an inter-wireless-device coordination with the at least one second wireless device.
9 . The method of claim 1 , wherein the sidelink RP comprises at least one sidelink RB set.
10 . The method of claim 9 , wherein a sidelink RB set of the at least one sidelink RB set indicates a frequency band for a sidelink transmission based on a listen-before-talk (LBT) procedure.
11 . The method of claim 1 , wherein the at least one message comprises a radio resource control (RRC) message from a base station.
12 . The method of claim 1 , wherein the at least one message comprises a radio resource control (RRC) message from at least one third wireless device.
13 . A method comprising:
receiving, by a first wireless device, at least one radio resource control (RRC) message comprising one or more parameters indicating:
a first quantity of subchannels of a sidelink resource pool (RP); and
a quantity of resource block (RB) interlaces of the sidelink RP, wherein the quantity of RB interlaces is based on the first quantity of subchannels multiplied by an integer number;
selecting at least one RB of the sidelink RP for at least one sidelink transmission via a second quantity of subchannels, wherein the selecting is based on:
the quantity of RB interlaces in the sidelink RP; and
the second quantity being a subquantity of the first quantity of subchannels; and
transmitting, to at least one second wireless device, the at least one sidelink transmission comprising the selected at least one RB.
14 . The method of claim 13 , wherein the quantity of RB interlaces is associated with the first quantity of subchannels.
15 . The method of claim 14 , wherein the selecting further comprises selecting the at least one RB based on a second quantity of subchannels of the at least one sidelink transmission in the sidelink RP.
16 . A method comprising:
receiving, by at least one first wireless device, at least one message comprising an interlace coefficient for an association between a first quantity of subchannels of a sidelink resource pool (RP) and a quantity of resource block (RB) interlaces of the sidelink RP;
selecting at least one RB for at least one sidelink transmission via the sidelink RP, wherein the selecting is based on:
the at least one message; and
a second quantity of subchannels, wherein the second quantity is a subquantity of the first quantity of subchannels; and
transmitting, to at least one second wireless device, the at least one sidelink transmission comprising the at least one selected RB.
17 . The method of claim 16 , wherein the at least one message comprises at least one of:
a radio resource control (RRC) message;
a medium access control control element (MAC CE);
downlink control information (DCI); or
sidelink control information (SCI).
18 . The method of claim 16 , wherein an RB interlace of the quantity of RB interlaces indicates a set of RBs, equally spaced in a frequency domain, and wherein two adjacent RBs, of the set of RBs in the frequency domain, are separated by a difference of the quantity of RB interlaces and one.
19 . The method of claim 16 , wherein the at least one message further comprises a field indicating the first quantity of subchannels of the sidelink RP.