Prioritized channel access for sidelink communication in shared channel
A user equipment (UE) communicates on a shared channel using sidelink transmissions. The UE determines a channel access priority for the sidelink transmission based on a channel access priority for the UE, a channel access priority associated with a packet priority of the sidelink transmission, a congestion level for the channel, or a remaining time in a packet delay budget of the sidelink transmission. The UE performs a channel access procedure based on the channel access priority for the sidelink transmission to assess that the channel is clear prior to transmitting the sidelink transmission, and transmits the sidelink transmission on the channel.
1 . A method of wireless communication at a user equipment (UE), comprising:
determining a channel access priority for a sidelink transmission from a set of channel access priorities;
performing a channel access procedure based on the determined channel access priority; and
transmitting the sidelink transmission to one or multiple receiving UEs based on the channel access procedure,
wherein subsequent transmission by the one or multiple receiving UEs are performed based on a channel access priority being equal to or higher than the determined channel access priority.
2 . The method of claim 1 , wherein the UE has a configured channel access priority for the sidelink transmission, and wherein determining the channel access priority for the sidelink transmission comprises determining the configured channel access priority for the UE to be the channel access priority.
3 . The method of claim 2 , wherein the configured channel access priority is configured by a network node, further comprising:
receiving a signal from the network node indicating the channel access priority for the UE.
4 . The method of claim 1 , wherein the UE has a channel access priority associated with initiating a channel occupancy, and wherein performing the channel access procedure further comprises initiating a channel occupancy.
5 . The method of claim 1 , wherein:
the sidelink transmission has a packet priority from a set of packet priorities associated with the set of channel access priorities; and
determining the channel access priority for the sidelink transmission is based on the packet priority of the sidelink transmission.
6 . The method of claim 5 , wherein lower channel access priorities correspond to lower packet priorities.
7 . The method of claim 5 , wherein:
each packet priority of the set of packet priorities is mapped to a channel access priority, and
determining the channel access priority for the sidelink transmission comprises determining the channel access priority based on the packet priority and the mapping.
8 . The method of claim 5 , wherein:
the set of channel access priorities has N packet priorities, N being a positive integer,
the set of packet priorities has M packet priorities, M being an integer greater than N, and
at least two packet priorities of the set of packet priorities are mapped to one channel access priority of the set of channel access priorities.
9 . The method of claim 1 , further comprising:
determining a congestion level for the channel, wherein determining the channel access priority for the sidelink transmission is based on the congestion level.
10 . The method of claim 9 , wherein the congestion level is based on a channel busy ratio for the channel.
11 . The method of claim 9 , wherein a high congestion level corresponds to a low determined channel access priority.
12 . The method of claim 1 , wherein:
the sidelink transmission has a packet delay budget, and
determining the channel access priority for the sidelink transmission is based on a remaining time in the packet delay budget.
13 . The method of claim 12 , wherein a lower remaining time in the packet delay budget corresponds to a higher channel access priority.
14 . The method of claim 12 , wherein:
each channel access priority of the set of channel access priorities has a minimum remaining time, and
determining the channel access priority for the sidelink transmission is based on selecting a channel access priority of the set of channel access priorities with a minimum remaining time that is less than the remaining time in the packet delay budget of the sidelink transmission.
15 . The method of claim 1 , wherein determining the channel access priority for the sidelink transmission is based on a configured channel access priority for the UE, a channel access priority associated with a packet priority of the transmission, a congestion level for the channel, or a remaining time in a packet delay budget of the sidelink transmission.
16 . The method of claim 1 , wherein determining the channel access priority for the sidelink transmission is based on at least two of a configured channel access priority for the UE, a channel access priority associated with a packet priority of the transmission, a congestion level for the channel, and a remaining time in a packet delay budget of the sidelink transmission.
17 . An apparatus for wireless communication at a user equipment (UE), comprising:
means for determining a channel access priority for a sidelink transmission from a set of channel access priorities;
means for performing a channel access procedure based on the determined channel access priority; and
means for transmitting the sidelink transmission to one or multiple receiving UEs based on the channel access procedure,
wherein subsequent transmission by the one or multiple receiving UEs are performed based on a channel access priority being equal to or higher than the determined channel access priority.
18 . An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine a channel access priority for a sidelink transmission from a set of channel access priorities;
perform a channel access procedure; and
transmit the sidelink transmission to one or multiple receiving UEs based on the channel access procedure,
wherein subsequent transmission by the one or multiple receiving UEs are performed based on a channel access priority being equal to or higher than the determined channel access priority.
19 . The apparatus of claim 18 , wherein the UE has a configured channel access priority for the sidelink transmission, and wherein determining the channel access priority for the sidelink transmission comprises determining the configured channel access priority for the UE to be the channel access priority.
20 . The apparatus of claim 19 , wherein the configured channel access priority is configured by a network node, wherein the processor is further configured to:
receive a signal from the network node indicating the channel access priority for the UE.
21 . The apparatus of claim 18 , wherein the UE has a channel access priority associated with initiating a channel occupancy, and wherein performing the channel access procedure further comprises initiating a channel occupancy.
22 . The apparatus of claim 18 , wherein:
the sidelink transmission has a packet priority from a set of packet priorities associated with the set of channel access priorities, and
determining the channel access priority for the sidelink transmission is based on the packet priority of the sidelink transmission.
23 . The apparatus of claim 22 , wherein lower channel access priorities correspond to lower packet priorities.
24 . The apparatus of claim 22 , wherein:
each packet priority of the set of packet priorities is mapped to a channel access priority, and
determining the channel access priority for the sidelink transmission comprises determining the channel access priority based on the packet priority and the mapping.
25 . The apparatus of claim 22 , wherein:
the set of channel access priorities has N packet priorities, N being a positive integer,
the set of packet priorities has M packet priorities, M being an integer greater than N, and
at least two packet priorities of the set of packet priorities are mapped to one channel access priority of the set of channel access priorities.
26 . The apparatus of claim 18 , wherein the processor is further configured to:
determine a congestion level for the channel, wherein determining the channel access priority for the sidelink transmission is based on the congestion level.
27 . The apparatus of claim 18 , wherein:
the sidelink transmission has a packet delay budget, and
determining the channel access priority for the sidelink transmission is based on a remaining time in the packet delay budget.
28 . The apparatus of claim 27 , wherein:
each channel access priority of the set of channel access priorities has a minimum remaining time, and
determining the channel access priority for the sidelink transmission is based on selecting a channel access priority of the set of channel access priorities with a minimum remaining time that is less than the remaining time in the packet delay budget of the sidelink transmission.
29 . The apparatus of claim 18 , wherein determining the channel access priority for the sidelink transmission is based on a configured channel access priority for the UE, a channel access priority associated with a packet priority of the transmission, a congestion level for the channel, or a remaining time in a packet delay budget of the sidelink transmission.
30 . A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment, the code when executed by a processor causes the processor to:
determine a channel access priority for a sidelink transmission from a set of channel access priorities;
perform a channel access procedure based on the determined channel access priority; and
transmit the sidelink transmission to one or multiple receiving UEs based on the channel access procedure,
wherein subsequent transmission by the one or multiple receiving UEs are performed based on a channel access priority being equal to or higher than the determined channel access priority.
31 . The apparatus of claim 18 , wherein the subsequent transmission by the one or multiple receiving UEs are further made on a shared channel occupancy corresponding to the channel access procedure.
32 . The method of claim 1 , wherein the subsequent transmission by the one or multiple receiving UEs are further made on a shared channel occupancy corresponding to the channel access procedure.