Relay apparatus, communication apparatus, control method, and computer-readable storage medium for executing handover processing of relay apparatus

Patent metadata

Field	Value
Publication number	US-12513581-B2
Application number	US-202218080304-A
Country	US
Kind code	B2
Filing date	Dec 13, 2022
Priority date	Jun 26, 2020
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A relay apparatus that relays communication between a base station apparatus and a communication apparatus that is connected to the base station apparatus executes, in a case where the relay apparatus performs a handover to another base station apparatus, control so as to withhold transmitting/receiving a signal for a handover of the communication apparatus between the communication apparatus and the base station apparatus while the relay apparatus is not successful in a handover.

First claim

What is claimed is:

1 . A relay apparatus that relays communication between a base station apparatus and a communication apparatus that is connected to the base station apparatus, the relay apparatus comprising:
one or more processors; and one or more memories that store a computer-readable instruction for causing, when executed by the one or more processors, the relay apparatus to: receive from the base station apparatus, in a case where the relay apparatus performs a handover to another base station apparatus, a Radio Resource Control (RRC) Reconfiguration message for handover of the communication apparatus that includes information indicating that the communication apparatus is not required to perform a random access procedure in a handover process of the communication apparatus; and transmit, to the communication apparatus, the received RRC Reconfiguration message.

2 . The relay apparatus according to claim 1 , wherein
the relay apparatus receives a RRC Reconfiguration Complete message for handover of the communication apparatus that is transmitted, without performing the random access procedure, from the communication apparatus having received the RRC Reconfiguration message, and the relay apparatus transmits the received RRC Reconfiguration Complete message to the another base station apparatus.

3 . The relay apparatus according to claim 2 , wherein
the relay apparatus transmits, to the communication apparatus, a response signal responsive to the RRC Reconfiguration Complete message.

4 . The relay apparatus according to claim 2 , wherein
the RRC Reconfiguration message includes, as identification information of the communication apparatus, Cell Radio Network Temporary Identifier (C-RNTI) or ReestabUE-Id entity.

5 . The relay apparatus according to claim 2 , wherein
the relay apparatus receives, from the base station apparatus, another RRC Reconfiguration message for handover of the relay apparatus that include information indicating that the relay apparatus is required to perform a random access procedure, and the relay apparatus transmits, after performing the random access procedure with the another base station apparatus based on reception of the another RRC Reconfiguration message, a RRC Reconfiguration Complete message for handover of the relay apparatus, to the another base station apparatus.

6 . The relay apparatus according to claim 5 , wherein
the another RRC Reconfiguration message includes identification information of the relay apparatus that is associated with an Internet Protocol (IP) address.

7 . A communication apparatus that is to be connected to a base station apparatus via a relay apparatus, comprising:
one or more processors; and one or more memories that store a computer-readable instruction for causing, when executed by the one or more processors, the communication apparatus to: receive, in a case where the relay apparatus performs a handover to another base station apparatus, a Radio Resource Control (RRC) Reconfiguration message for handover of the communication apparatus that includes information indicating that the communication apparatus is not required to perform a random access procedure in a handover process of the communication apparatus; and transmit, without performing the random access procedure, an RRC Reconfiguration Complete message for handover of the communication apparatus, based on the received RRC Reconfiguration message.

8 . The communication apparatus according to claim 7 , wherein
the communication apparatus receives, from the relay apparatus, a response signal responsive to the RRC Reconfiguration Complete message.

9 . The communication apparatus according to claim 7 , wherein
the RRC Reconfiguration message includes, as identification information of the communication apparatus, Cell Radio Network Temporary Identifier (C-RNTI) or ReestabUE-Id entity.

10 . A control method that is executed by a relay apparatus that relays communication between a base station apparatus and a communication apparatus that is connected to the base station apparatus, the method comprising:
receiving from the base station apparatus, in a case where the relay apparatus performs a handover to another base station apparatus, a Radio Resource Control (RRC) Reconfiguration message for handover of the communication apparatus that includes information indicating that the communication apparatus is not required to perform a random access procedure in a handover process of the communication apparatus; and transmitting, to the communication apparatus, the received RRC Reconfiguration message.

11 . A control method that is executed by a communication apparatus that is connected to a base station apparatus via a relay apparatus, comprising:
receiving, in a case where the relay apparatus performs a handover to another base station apparatus, a Radio Resource Control (RRC) Reconfiguration message for handover of the communication apparatus that includes information indicating that the communication apparatus is not required to perform a random access procedure in a handover process of the communication apparatus; and transmitting, without performing the random access procedure, an RRC Reconfiguration Complete message for handover of the communication apparatus, based on the received RRC Reconfiguration message.

12 . A non-transitory computer-readable storage medium that stores a program for causing a computer included in a relay apparatus, which relays communication between a base station apparatus and a communication apparatus that is connected to the base station apparatus, to:
receive from the base station apparatus, in a case where the relay apparatus performs a handover to another base station apparatus, a Radio Resource Control (RRC) Reconfiguration message for handover of the communication apparatus that includes information indicating that the communication apparatus is not required to perform a random access procedure in a handover process of the communication apparatus; and transmit, to the communication apparatus, the received RRC Reconfiguration message.

13 . A non-transitory computer-readable storage medium that stores a program for causing a computer included in a communication apparatus, which is connected to a base station apparatus via a relay apparatus;
receive, in a case where the relay apparatus performs a handover to another base station apparatus, a Radio Resource Control (RRC) Reconfiguration message for handover of the communication apparatus that includes information indicating that the communication apparatus is not required to perform a random access procedure in a handover process of the communication apparatus; and transmit, without performing the random access procedure, an RRC Reconfiguration Complete message for handover of the communication apparatus, based on the received RRC Reconfiguration message.

Assignees

• Kddi Corp

Inventors

• Takeda Hiroki
• Li Yanwei

Classifications

• H04W76/30

  Connection release · CPC title

• H04W84/047

  using dedicated repeater stations · CPC title

• H04W36/0079 Primary

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

• H04W36/0055 Primary

  Transmission or use of information for re-establishing the radio link · CPC title