Remote UE group paging for relay power saving
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a base station, information identifying multiple remote UEs for which the UE serves as a relay UE. The UE may receive, from the base station, an indication of a grouping of the remote UEs into one or more paging groups. The UE may monitor, for each paging group of the one or more paging groups, paging occasions associated with that paging group to determine whether paging messages for the remote UEs in that paging group are received from the base station. Numerous other aspects are described.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
transmitting, to a base station, information identifying multiple remote UEs for which the UE serves as a relay UE;
receiving, from the base station, an indication of a grouping of the remote UEs into one or more paging groups;
monitoring, for each paging group of the one or more paging groups, one or more paging occasions associated with that paging group to determine whether paging messages for the remote UEs in that paging group are received from the base station;
receiving, in a paging occasion of the one or more paging occasions, a physical downlink control channel communication including an indication that a paging group of the one or more paging groups is paged in a paging message;
receiving a physical downlink shared channel communication including the paging message and an indication of a remote UE in the paging group; and
forwarding the paging message to the remote UE in the paging group.
2 . The method of claim 1 , wherein the UE is included in a paging group of the one or more paging groups.
3 . The method of claim 1 , wherein the remote UEs and the UE are grouped into a single paging group.
4 . The method of claim 1 , wherein receiving the indication comprises:
receiving, in a radio resource control (RRC) connected mode, an RRC reconfiguration message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
5 . The method of claim 1 , wherein receiving the indication comprises:
receiving, in a radio resource control (RRC) connected mode prior to switching to an RRC idle mode or an RRC inactive mode, an RRC release message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
6 . The method of claim 1 , wherein receiving the indication comprises:
receiving, in a radio resource control (RRC) idle mode or an RRC inactive mode, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE identifiers of the remote UEs.
7 . The method of claim 1 , wherein receiving the indication comprises:
receiving, in a radio resource control (RRC) idle mode or an RRC inactive mode, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE types of the remote UEs.
8 . A method of wireless communication performed by a base station, comprising:
receiving, from a user equipment (UE), information identifying multiple remote UEs for which the UE serves as a relay UE;
transmitting, to the UE, an indication of a grouping of the remote UEs into one or more paging groups;
transmitting, to the UE in a paging occasion of one or more paging occasions, a physical downlink control channel communication including an indication that a paging group of the one or more paging groups is paged in a paging message; and
transmitting a physical downlink shared channel communication including the paging message and an indication of a remote UE in the paging group.
9 . The method of claim 8 , wherein the UE is included in a paging group of the one or more paging groups.
10 . The method of claim 8 , wherein the remote UEs and the UE are grouped into a single paging group.
11 . The method of claim 8 , wherein transmitting the indication comprises:
transmitting, to the UE, a radio resource control (RRC) reconfiguration message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
12 . The method of claim 8 , wherein transmitting the indication comprises:
transmitting, to the UE, a radio resource control (RRC) release message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
13 . The method of claim 8 , wherein transmitting the indication comprises:
transmitting, to the UE, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE identifiers of the remote UEs.
14 . The method of claim 8 , wherein transmitting the indication comprises:
transmitting, to the UE, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE types of the remote UEs.
15 . The method of claim 8 , further comprising:
transmitting, to the UE in a paging occasion associated with a paging group of the one or more paging groups, a paging message for one of the remote UEs included in the paging group.
16 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors operatively coupled to the one or more memories, the one or more memories and the one or more processors configured to:
transmit, to a base station, information identifying multiple remote UEs for which the UE serves as a relay UE;
receive, from the base station, an indication of a grouping of the remote UEs into one or more paging groups;
monitor, for each paging group of the one or more paging groups, one or more paging occasions associated with that paging group to determine whether paging messages for the remote UEs in that paging group are received from the base station;
receive, in a paging occasion of the one or more paging occasions, a physical downlink control channel communication including an indication that a paging group of the one or more paging groups is paged in a paging message;
receive a physical downlink shared channel communication including the paging message and an indication of a remote UE in the paging group; and
forward the paging message to the remote UE in the paging group.
17 . The UE of claim 16 , wherein the one or more processors, when receiving the indication, are configured to:
receive, in a radio resource control (RRC) connected mode, an RRC reconfiguration message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
18 . The UE of claim 16 , wherein the one or more processors, when receiving the indication, are configured to:
receive, in a radio resource control (RRC) connected mode prior to switching to an RRC idle mode or an RRC inactive mode, an RRC release message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
19 . The UE of claim 16 , wherein the one or more processors, when receiving the indication, are configured to:
receive, in a radio resource control (RRC) idle mode or an RRC inactive mode, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE identifiers of the remote UEs.
20 . The UE of claim 16 , wherein the one or more processors, when receiving the indication, are configured to:
receive, in a radio resource control (RRC) idle mode or an RRC inactive mode, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE types of the remote UEs.
21 . The UE of claim 16 , wherein the UE is included in a paging group of the one or more paging groups.
22 . The UE of claim 16 , wherein the remote UEs and the UE are grouped into a single paging group.
23 . A base station for wireless communication, comprising:
one or more memories; and
one or more processors operatively coupled to the one or more memories, the one or more memories and the one or more processors configured to:
receive, from a user equipment (UE), information identifying multiple remote UEs for which the UE serves as a relay UE;
transmit, to the UE, an indication of a grouping of the remote UEs into one or more paging groups;
transmit, to the UE in a paging occasion of one or more paging occasions, a physical downlink control channel communication including an indication that a paging group of the one or more paging groups is paged in a paging message; and
transmit a physical downlink shared channel communication including the paging message and an indication of a remote UE in the paging group.
24 . The base station of claim 23 , wherein the one or more processors, when transmitting the indication, are configured to:
transmit, to the UE, a radio resource control (RRC) reconfiguration message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
25 . The base station of claim 24 , wherein the one or more processors, when transmitting the indication, are configured to:
transmit, to the UE, a radio resource control (RRC) release message indicating, for each of the one or more paging groups, a group identifier for the paging group and a UE identifier for each remote UE included in the paging group.
26 . The base station of claim 23 , wherein the one or more processors, when transmitting the indication, are configured to:
transmit, to the UE, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE identifiers of the remote UEs.
27 . The base station of claim 23 , wherein the one or more processors, when transmitting the indication, are configured to:
transmit, to the UE, a system information block that indicates a mapping that maps the remote UEs to the one or more paging groups based at least in part on UE types of the remote UEs.
28 . The base station of claim 23 , wherein the one or more processors are further configured to:
transmit, to the UE in a paging occasion associated with a paging group of the one or more paging groups, a paging message for one of the remote UEs included in the paging group.
29 . The base station of claim 23 , wherein the UE is included in a paging group of the one or more paging groups.
30 . The base station of claim 23 , wherein the remote UEs and the UE are grouped into a single paging group.