IP Library › Granted Patent US 12,550,022
Granted Patent B2
US 12,550,022 · App. 17/926,166 · Granted Feb 10, 2026

Method of WTRU to network relay handover

Inventors: Xiaoyan Shi (Westmount, CA); Behrouz Aghili (Commack, NY); Saad Ahmad (Montreal, CA); Michelle Perras (Montreal, CA); Ulises Olvera-Hernandez (Saint-Lazare, CA)
Assignee: InterDigital Patent Holdings, Inc.
H04W36/08H04W36/0079
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12,550,022
App. No.
17/926,166
Granted
Feb 10, 2026
Kind
B2
Abstract

A method addressing handover procedure failure or cancellation includes receiving, by a remote wireless transmit/receive unit (WTRU) connected to a source NodeB, a handover command to begin a handover procedure to establish a connection with a target NodeB on a network. A method may further include, on a condition that the handover procedure fails, transmitting, by a relay TRU, a handover failure/cancellation indication to the remote WTRU and cancelling, by the remote WTRU, the handover procedure. A method may also include initiating, by the remote WTRU, a radio resource control (RRC) re-establishment procedure to connect with the source NodeB or a new NodeB.

Claims (34)

1 . A relay wireless transmit/receive unit (WTRU) comprising:

a processor; and

a transceiver,

wherein the transceiver is configured to receive, from a source nodeB, a handover command including an indication to begin a handover procedure to establish a connection between at least one remote WTRU and a target nodeB;

wherein the processor and the transceiver are configured to begin another handover procedure to establish a connection between the relay WTRU and the target nodeB, wherein the connection between the relay WTRU and the target nodeB is to be used to establish the connection between the at least one remote WTRU and the target nodeB; and

wherein the processor and the transceiver are configured to, based on a determination that the another handover procedure to establish a connection between the relay WTRU and the target nodeB is not complete, broadcast a first message indicating that the another handover procedure is not complete and indicating another target nodeB to which the relay WTRU is to establish a connection.

2 . The relay WTRU of claim 1 , wherein the processor and the transceiver are further configured to begin a handover procedure to establish a connection between the relay WTRU and the another target nodeB, wherein the connection between the relay WTRU and the another target nodeB is to be used to establish a connection between the at least one remote WTRU and the another target nodeB.

3 . The relay WTRU of claim 1 , wherein the first message includes an indication of the target nodeB for which the another handover procedure is not complete.

4 . The relay WTRU of claim 1 , wherein the another handover procedure is not complete due to cancellation or failure of the another handover procedure.

5 . The relay WTRU of claim 4 , wherein the transceiver is further configured to receive a second message from the source nodeB indicating cancellation of the another handover procedure.

6 . The relay WTRU of claim 5 , wherein the second message received from the source nodeB indicating cancellation of the another handover procedure further indicates cancellation of the handover procedure.

7 . The relay WTRU of claim 1 , wherein the first message is a discovery message.

8 . A method performed by a relay wireless transmit/receive unit (WTRU) comprising:

receiving, from a source nodeB, a handover command including an indication to begin a handover procedure to establish a connection between at least one remote WTRU and a target nodeB;

beginning another handover procedure to establish a connection between the relay WTRU and the target nodeB, wherein the connection between the relay WTRU and the target nodeB is to be used to establish the connection between the at least one remote WTRU and the target nodeB; and

broadcasting, based on a determination that the another handover procedure to establish a connection between the relay WTRU and the target nodeB is not complete, a first message indicating that the another handover procedure is not complete and indicating another target nodeB to which the relay WTRU is to establish a connection.

9 . The method of claim 8 further comprising beginning a handover procedure to establish a connection between the relay WTRU and the another target nodeB, wherein the connection between the relay WTRU and the another target nodeB is to be used to establish a connection between the at least one remote WTRU and the another target nodeB.

10 . The method of claim 8 , wherein the first message includes an indication of the target nodeB for which the another handover procedure is not completed.

11 . The method of claim 8 , wherein the another handover procedure is not completed due to cancellation or failure of the another handover procedure.

12 . The method of claim 11 further comprising receiving a second message from the source nodeB indicating cancellation of the another handover procedure.

13 . The method of claim 12 , wherein the second message received from the source nodeB indicating cancellation of the another handover procedure further indicates cancellation of the handover procedure.

14 . The method of claim 8 , wherein the first message is a discovery message.

15 . A remote wireless transmit/receive unit (WTRU) comprising:

a processor; and

a transceiver,

wherein the transceiver is configured to receive, from a relay WTRU, a handover command including an indication from a source nodeB to begin a handover procedure to establish a connection with a target nodeB;

wherein the transceiver is configured to receive, from the relay WTRU, a first message indicating that a handover procedure to establish a connection between the relay WTRU and the target nodeB is not complete;

wherein the transceiver is configured to receive a handover command from the relay WTRU including an indication to begin another handover procedure to establish a connection with another target nodeB; and

wherein the processor and the transceiver are configured to transmit a second message using a connection established with the another target nodeB via the relay WTRU.

16 . The remote WTRU of claim 15 , wherein the second message transmitted using the connection established with the another target nodeB is transmitted to the another target nodeB via at least one relay WTRU.

17 . The remote WTRU of claim 15 , wherein the first message received from the relay WTRU includes an indication of the target nodeB for which the another handover procedure is not complete.

18 . The remote WTRU of claim 15 , wherein the second message transmitted using the connection established with the another target nodeB is transmitted directly from the remote WTRU to the another target nodeB.

19 . The remote WTRU of claim 15 , wherein the first message received from the relay WTRU includes an indication of the another target nodeB.

20 . The remote WTRU of claim 15 , wherein the another target nodeB and the source nodeB are different nodeBs.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 7, 2023
From: IDAC HOLDINGS, INC. BY ITS SUCCESSOR INTERDIGITAL PATENT HOLDINGS, INC.
To: INTERDIGITAL PATENT HOLDINGS, INC.
Reel/Frame 063908/0521 →
Continuity (2)
Provisional Application 63028258 · May 21, 2020
Related Publication 20230199594A1 · Jun 22, 2023
References Cited (25)
US 20120252355A1 · Huang et al. · 2012 [cited by applicant]
US 20180139794A1 · Chae · 2018 [cited by examiner]
US 20190239147A1 · Chun et al. · 2019 [cited by applicant]
US 20200037218A1 · Karampatsis · 2020 [cited by examiner]
KR 20180122836 · 2018 [cited by applicant]
KR 20180122836A · 2018 [cited by examiner]
WO 2018171514 · 2018 [cited by applicant]
KR20180122836A-English Translation (Year: 2025). [cited by examiner]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; System architecture for the 5G System (5GS); Stage 2 (Release 16),” 3GPP TS 23.501 V16.4.0 (Mar. 2020). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; System Architecture for the 5G System; Stage 2 (Release 16),” 3GPP TS 23.501 V16.0.0 (Mar. 2019). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; System architecture for the 5G System (5GS); Stage 2 (Release 16),” 3GPP TS 23.501 V16.8.0 (Mar. 2021). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; System architecture for the 5G System (5GS); Stage 2 (Release 17),” 3GPP TS 23.501 V17.0.0 (Mar. 2021). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; Procedures for the 5G System (5GS); Stage 2 (Release 16),” 3GPP TS 23.502 V16.4.0 (Mar. 2020). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; Procedures for the 5G System; Stage 2 (Release 16),” 3GPP TS 23.502 V16.0.0 (Mar. 2019). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; Procedures for the 5G System (5GS); Stage 2 (Release 16),” 3GPP TS 23.502 V16.8.0 (Mar. 2021). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; Procedures for the 5G System (5GS); Stage 2 (Release 17),” 3GPP TS 23.502 V17.0.0 (Mar. 2021). [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; Study on system enhancement for Proximity based Services (ProSe) in the 5G System (5GS) (Release 17),” 3GPP TR 23.752 V17… [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; Study on system enhancement for Proximity based Services (ProSe) in the 5G System (5GS) (Release 17),” 3GPP TR 23.752 V0.… [cited by applicant]
Third Generation Partnership Project, “Technical Specification Group Services and System Aspects; Study on Architecture Enhancements to ProSe UE-to-Network Relay (Release 15),” 3GPP TR 23.733 V15.1.0 (Dec. 2017). [cited by applicant]
IEEE Standard for Information technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements; Part 11: Wireless LAN Medium Access Control (MAC) and Phys… [cited by applicant]
IEEE Standard for Information technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements; Part 11: Wireless LAN Medium Access Control (MAC) and Phys… [cited by applicant]
IEEE Standard for Information Technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements; Part 11: Wireless LAN Medium Access Control (MAC) and Phys… [cited by applicant]
IEEE Standard for Information technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements; Part 11: Wireless LAN Medium Access Control (MAC) and Phys… [cited by applicant]
IEEE Standard for Information technology—Telecommunications and information exchange between systems Local and metropolitan area networks—Specific requirements; Part 11: Wireless LAN Medium Access Control (MAC) and Phys… [cited by applicant]
IEEE Standard for Information technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements; Part 11: Wireless LAN Medium Access Control (MAC) and Phys… [cited by applicant]