IP Library › Granted Patent US 12689976
Granted Patent B2
US 12689976 · App. 18/250,072 · Granted Jul 21, 2026

Method and apparatus for remote UE mobility management

Inventors: Zhuo Chen (Claymont, DE); Pascal Adjakple (Great Neck, NY); Kyle Pan (Saint James, NY); Yifan Li (Conshohocken, PA); Joseph Murray (Schwenksville, PA); Rocco Di Girolamo (Laval, CA)
Assignee: InterDigital Patent Holdings, Inc.
H04W48/20H04W72/25
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Quick Facts
Patent No.
US 12689976
App. No.
18/250,072
Granted
Jul 21, 2026
Kind
B2
Abstract

Methods and apparatuses are described herein for remote UE mobility management. Methods are proposed to consider the impact of coverage through PC5 interface when a remote UE is doing the cell (re)selection. A remote UE may select a serving cell considering the impact of coverage through PC5 interface when the remote UE and the Relay UE are in coverage of different cells. The remote UE may detect and reselect a cell via the Uu interface while it has selected a serving cell via a Relay UE. The remote UE may detect and reselect to a cell via a Relay UE while it has selected a serving cell via the Uu interface.

Claims (45)

1 . A wireless transmit/receive unit (WTRU), comprising a transceiver and one or more processors, configured to:

receive paging path selection criteria;

select a frequency for use in searching for a cell to establish a direct path of communication;

determine that there is no suitable cell associated with the frequency;

based on the determination that there is no suitable cell associated with the frequency, determine that one or more relay WTRUs are communicating via a sidelink channel;

select, based on one or more criteria, a relay WTRU from the one or more relay WTRUs;

establish an indirect communication path via the selected relay WTRU; and

select, based on the paging path selection criteria, a paging path.

2 . The WTRU of claim 1 , wherein the one or more criteria comprise one or more of: a PLMN ID of the one or more relay WTRUs, access restrictions associated with a serving cell of the one or more relay WTRUs, a tracking area of the one or more relay WTRUs.

3 . The WTRU of claim 1 , further configured to:

receive a cell reselection frequency priority.

4 . The WTRU of claim 3 , further configured to:

if a highest priority frequency indicated by the cell reselection frequency priority is an intra-frequency, measure a signal quality of the indirect communication path via the selected relay WTRU.

5 . The WTRU of claim 4 , further configured to:

if the signal quality is below a threshold, perform a cell reselection procedure.

6 . The WTRU of claim 5 , wherein the cell reselection procedure includes evaluation of the one or more relay WTRUs that are communicating via the sidelink channel.

7 . The WTRU of claim 1 , further configured to:

send, to a base station, an indication of the selected paging path.

8 . The WTRU of claim 7 , further configured to:

receive, from the base station, a confirmation that the selected paging path is configured.

9 . The WTRU of claim 7 , wherein the selected paging path is the indirect communication path via the selected relay WTRU.

10 . The WTRU of claim 7 , wherein the selected paging path is a direct communication path with the base station.

11 . A method for use in a wireless transmit/receive unit (WTRU), the method comprising:

receiving paging path selection criteria;

selecting a frequency for use in searching for a cell to establish a direct path of communication;

determining that there is no suitable cell associated with the frequency;

based on the determination that there is no suitable cell associated with the frequency,

determining that one or more relay WTRUs are communicating via a sidelink channel;

selecting, based on one or more criteria, a relay WTRU from the one or more relay WTRUs;

establishing an indirect communication path via the selected relay WTRU; and

selecting, based on the paging path selection criteria, a paging path.

12 . The method of claim 11 , wherein the one or more criteria comprise one or more of: a PLMN ID of the one or more relay WTRUs, access restrictions associated with a serving cell of the one or more relay WTRUs, a tracking area of the one or more relay WTRUs.

13 . The method of claim 11 , further comprising:

receiving a cell reselection frequency priority.

14 . The method of claim 13 , further comprising:

in response to detecting that a highest priority frequency indicated by the cell reselection frequency priority is an intra-frequency, measuring a signal quality of the indirect communication path via the selected relay WTRU.

15 . The method of claim 14 , further comprising:

in response to detecting that the signal quality is below a threshold, performing a cell reselection procedure.

16 . The method of claim 15 , wherein the cell reselection procedure includes evaluation of the one or more relay WTRUs that are communicating via the sidelink channel.

17 . The method of claim 11 , further comprising:

sending, to a base station, an indication of the selected paging path.

18 . The method of claim 17 , further comprising:

receiving, from the base station, a confirmation that the selected paging path is configured.

19 . The method of claim 17 , wherein the selected paging path is the indirect communication path via the selected relay WTRU.

20 . The method of claim 17 , wherein the selected paging path is a direct communication path with the base station.