Sidelink paging for a wireless device
A technique for power saving for a wireless device, the technique including determining, by a first wireless device, a set of resources for communicating directly with a second wireless device the set of resources including a first set of paging resources, establishing a sidelink session with the second wireless device based on the set of resources, entering, by the first wireless device, a reduced power state, monitoring, by the first wireless device and based on the paging schedule, the first set of paging resources, receiving, from the second wireless device, a paging message, exiting the reduced power state based on the received paging message, and monitoring, based on the received paging message, the set of resources.
1 . A method for power saving for a first wireless device, comprising:
determining a set of resources for communicating directly with a second wireless device, the set of resources including a first set of paging resources, wherein the first set of paging resources comprises one or more sub-channels and the one or more sub-channels are associated with a different sub-channel size than another sidelink sub-channel;
establishing a sidelink session with the second wireless device based on the set of resources;
entering a reduced power state;
monitoring, based on a paging schedule, the first set of paging resources;
receiving, from the second wireless device, a paging message, wherein the paging message includes an identifier for the first wireless device and an identifier for the second wireless device;
exiting the reduced power state based on the received paging message; and
monitoring, based on the received paging message, the set of resources.
2 . The method of claim 1 , wherein the one or more sub-channels are configured with a physical sidelink feedback channel.
3 . The method of claim 1 , wherein the first set of paging resources comprises at least a portion of one or more slots.
4 . The method of claim 1 , wherein the first set of paging resources comprises one or more dedicated resource blocks.
5 . The method of claim 1 , wherein the first set of paging resources comprises one or more dedicated symbols in a slot.
6 . The method of claim 1 , further comprising:
selecting a subset of the first set of paging resources;
transmitting, to the second wireless device, an indication of the selected subset of the first set of paging resources;
receiving a configuration message, the configuration message indicating a second set of paging resources for the first wireless device; and
monitoring the selected subset of the set of paging resources.
7 . The method of claim 6 wherein the paging message further includes an indication of a sub-channel and a time to monitor for the sidelink transmission.
8 . The method of claim 1 , wherein the paging message includes an indication of a starting time to monitor for a sidelink transmission.
9 . The method of claim 1 , wherein the paging message is received on a physical sidelink shared channel (PSSCH).
10 . The method of claim 1 , wherein the paging message is included in a sidelink control information (SCI) message received on one of a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH).
11 . The method of claim 1 , wherein the paging message is included in a sidelink control information (SCI) message included in a physical sidelink control channel, wherein the paging message includes an indication that the SCI message is a paging message.
12 . The method of claim 1 , further comprising transmitting, to the second wireless device, an acknowledgment message in response to the received paging message.
13 . The method of claim 1 , further comprising:
receiving a reduced power trigger message, and wherein entering the reduced power state is based on the received reduced power trigger message.
14 . An integrated circuit configured to cause a first wireless device to:
determine a set of resources for communicating directly with a second wireless device, the set of resources including a first set of paging resources, wherein the first set of paging resources comprises one or more sub-channels and the one or more sub-channels are associated with a different sub-channel size than another sidelink sub-channel;
establish a sidelink session with the second wireless device based on the set of resources;
enter a reduced power state;
monitor based on the paging schedule, the first set of paging resources;
receive, from the second wireless device, a paging message, wherein the paging message includes an identifier for the first wireless device and an identifier for the second wireless device;
exit the reduced power state based on the received paging message; and
monitor, based on the received paging message, the set of resources.
15 . The integrated circuit of claim 14 , wherein the one or more sub-channels are configured with a physical sidelink feedback channel.
16 . A wireless device comprising:
an antenna;
a radio operably coupled to the antenna; and
a processor operably coupled to the radio;
wherein the wireless device is configured to:
determine a set of resources for communicating directly with a second wireless device, the set of resources including a first set of paging resources, wherein the first set of paging resources comprises one or more sub-channels and the one or more sub-channels are associated with a different sub-channel size than another sidelink sub-channel;
establish a sidelink session with the second wireless device based on the set of resources;
enter a reduced power state;
monitor based on the paging schedule, the first set of paging resources;
receive, from the second wireless device, a paging message, wherein the paging message includes an identifier for the wireless device and an identifier for the second wireless device;
exit the reduced power state based on the received paging message; and
monitor, based on the received paging message, the set of resources.
17 . The wireless device of claim 16 , wherein the one or more sub-channels are configured with a physical sidelink feedback channel.