# US 12,225,598 B2 · Mobile communication system, relay node, and base station

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- Number: US 12,225,598 B2
- Document ID: US12225598B2
- Status: Granted
- Kind: B2
- Application number: 17/661,433
- Filed: 2022-04-29
- Published: 2022-08-18
- Granted: 2025-02-11
- Earliest claimed: 2018-05-09
- Assignees: KYOCERA Corporation
- Applicants: KYOCERA Corporation
- Inventors: Masato Fujishiro
- Web page: https://patentgrep.com/patent/US12225598B2

## CPC

- H04W 76/10: Connection setup
- H04W 8/26: Network addressing or numbering for mobility support
- H04W 16/32: Hierarchical cell structures
- H04W 36/0055: {Transmission or use of information for re-establishing the radio link}
- H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00)
- H04W 76/15: Setup of multiple wireless link connections
- H04W 80/02: Data link layer protocols
- H04W 88/04: adapted for relaying to or from another terminal or user
- H04W 92/04: Interfaces between hierarchically different network devices
- H04W 92/20: between access points
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A base station, communication control method used in a base station, and mobile communication system including a base station transmit a handover request message for handing over a wireless communication apparatus having a RRC connection with the base station to another base station. The handover message includes an Integrated Access and Backhaul (IAB) indication indicating that the wireless communication apparatus is an IAB node having a user equipment function and a base station function.

## Claims

### Claim 1

A base station comprising:
a network communicator configured to transmit a handover request message for handing over a wireless communication apparatus having a RRC connection with the base station to another base station, wherein
the handover request message includes an Integrated Access and Backhaul (IAB) indication indicating that the wireless communication apparatus is an IAB node having a user equipment function and a base station function,
the IAB node has a UE function configured to perform radio communication with an upper node and a gNB function configured to perform radio communications with a lower node,
the base station comprises a transmitter configured to broadcast a System Information Block (SIB) including information indicating that the base station supports the IAB node, and
the network communicator is configured to transmit the IAB indication to an Access and Mobility Management Function (AMF) included in a core network.

### Claim 2 (depends on 1)

The base station according to claim 1, further comprising:
a receiver configured to receive the IAB indication from the wireless communication apparatus.

### Claim 3

A communication control method used in a base station, the method comprising:
transmitting a handover request message for handing over a wireless communication apparatus having a RRC connection with the base station to another base station, wherein
the handover request message includes an Integrated Access and Backhaul (IAB) indication indicating that the wireless communication apparatus is an IAB node having a user equipment function and a base station function,
the IAB node has a UE function configured to perform radio communication with an upper node and a gNB function configured to perform radio communications with a lower node, and
the method further comprises
broadcasting a System Information Block (SIB) including information indicating that the base station supports the IAB node, and
transmitting the IAB indication to an Access and Mobility Management Function (AMF) included in a core network.

### Claim 4

A mobile communication system including a base station and a wireless communication apparatus, wherein
the base station is configured to transmit a handover request message for handing over the wireless communication apparatus having a RRC connection with the base station to another base station, wherein
the handover request message includes an Integrated Access and Backhaul (IAB) indication indicating that the wireless communication apparatus is an IAB node having a user equipment function and a base station function,
the IAB node has a UE function configured to perform radio communication with an upper node and a gNB function configured to perform radio communications with a lower node,
the base station is configured to broadcast a System Information Block (SIB) including information indicating that the base station supports the IAB node, and
the base station is configured to transmit the IAB indication to an Access and Mobility Management Function (AMF) included in a core network.