Handover procedure for soft cell identity change

Patent metadata

Field	Value
Publication number	US-12532232-B2
Application number	US-202218064979-A
Country	US
Kind code	B2
Filing date	Dec 13, 2022
Priority date	Dec 13, 2022
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A wireless terminal of a cellular telecommunication system communicates with a first cell served by a mobile base station relay. The wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, from the first cell, a reconfiguration message comprising second cell information including a cell identity and an operating frequency of a second cell and an indication indicating whether or not the first cell will be replaced by the second cell. The processor circuitry is configured to: (1) perform, based on the reconfiguration message, a handover procedure to handover to the second cell, and (2) perform a cell selection procedure in a case that the handover procedure fails. During the cell selection procedure, the first cell is not considered as a candidate in a case that the indication indicates that the first cell will be replaced by the second cell.

First claim

What is claimed is:

1 . A wireless terminal of a cellular telecommunication system, the wireless terminal communicating with a first cell served by a mobile base station relay, the wireless terminal comprising:
receiver circuitry configured to receive, from the first cell, a reconfiguration message comprising:
second cell information including a cell identity and an operating frequency of a second cell, and;
an indication indicating whether or not the first cell will be shut down and replaced by the second cell;
processor circuitry configured to:
perform, based on the reconfiguration message, a handover procedure to handover to the second cell, and;
perform a cell reselection procedure in a case that the handover procedure fails;
wherein during the cell reselection procedure, the first cell is not considered as a candidate in a case that the indication indicates that the first cell will be shut down and replaced by the second cell.

2 . The wireless terminal of claim 1 , wherein the handover procedure fails in a case that a random access procedure to the second cell fails.

3 . The wireless terminal of claim 1 , wherein the cell identity of the second cell is different from a cell identity of the first cell.

4 . The wireless terminal of claim 1 , wherein the second cell is served by the mobile base station relay.

5 . An access node of a cellular telecommunication system, the access node serving a wireless terminal via a first cell served by a mobile base station relay, the access node comprising:
processor circuitry configured to generate a reconfiguration message comprising:
second cell information including a cell identity and an operating frequency of a second cell, and;
an indication indicating whether or not the first cell will be deactivated shut down and replaced by the second cell;
transmitter circuitry configured to transmit, via the mobile base station relay, to the wireless terminal, the reconfiguration message; wherein in a case that the indication indicates that the first cell will be shut down and replaced by the second cell, the first cell is not considered as a candidate during a cell reselection procedure performed by the wireless terminal, the cell reselection procedure being initiated after a failure of a handover procedure directed by the reconfiguration message.

6 . The access node of claim 5 , wherein the handover procedure fails in a case that a random access procedure to the second cell performed fails.

7 . The access node of claim 5 , wherein the cell identity of the second cell is different from a cell identity of the first cell.

8 . The access node of claim 5 , wherein the second cell is served by the mobile base station relay.

9 . A mobile base station relay of a cellular telecommunication system, the mobile base station relay communicating with an access node, the mobile base station relay serving a wireless terminal via a first cell, the mobile base station relay comprising:
receiver circuitry configured to receive, from the access node, a reconfiguration message comprising: second cell information including a cell identity and an operating frequency of a second cell, and; an indication indicating whether or not the first cell will be shut down and replaced by the second cell; transmitter circuitry configured to transmit, to the wireless terminal, via the first cell, the reconfiguration message; wherein in a case that the indication indicates that the first cell will be shut down and replaced by the second cell, the first cell is not considered as a candidate during a cell reselection procedure performed by the wireless terminal, the cell reselection procedure being initiated after a failure of a handover procedure directed by the reconfiguration message.

10 . The mobile base station relay of claim 9 , wherein the handover procedure fails in a case that a random access procedure to the second cell performed fails.

11 . The mobile base station relay of claim 9 , wherein the cell identity of the second cell is different from a cell identity of the first cell.

12 . The mobile base station relay of claim 9 , wherein the second cell is served by the mobile base station relay.

Assignees

• Sharp Kk

Inventors

• Ishii Atsushi

Classifications

• H04W36/0079 Primary

  in case of hand-off failure or rejection · CPC title

• H04W36/0061 Primary

  of neighbour cell information · CPC title