# US 10,873,874 B2 · Base station, radio relay station, and communication method for cancelling a connection to a base station during an overload condition

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- Number: US 10,873,874 B2
- Document ID: US10873874B2
- Status: Granted
- Kind: B2
- Application number: 16/496,120
- Filed: 2018-01-24
- Published: 2020-01-30
- Granted: 2020-12-22
- Earliest claimed: 2017-03-23
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Akira Kamei; Toru Yamada; Kyoji Hirata; Masahiro Serizawa; Yumiko Okuyama; Masashi Shimoma; Satoshi Hasegawa
- Web page: https://patentgrep.com/patent/US10873874B2

## CPC

- H04W 28/0284: {detecting congestion or overload during communication (monitoring arrangements H04L43/00)}
- H04B 7/15507: {Relay station based processing for cell extension or control of coverage area, (network planning with network coordinated processing with regard to cell extension H04W16/26; network topologies using dedicated repeater stations H04W84/047; terminal devices adapted for relaying to or from an other terminal H04W88/04)}
- H04B 7/15528: {Control of operation parameters of a relay station to exploit the physical medium}
- H04W 28/0215: {based on user or device properties, e.g. MTC-capable devices (services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51)}
- H04W 36/22: for handling the traffic
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04L 67/12: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 84/047: {using dedicated repeater stations}
- H04W 88/08: Access point 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)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present disclosure aims to provide a base station, a radio relay station, a communication method, and a program capable of preventing communication from being unavailable when the base station is brought into a high load condition. A base station (10) configured to communicate with a communication terminal (30) through a radio relay station (20), the base station (10) including: a control unit (11) configured to detect whether the own apparatus is in an overload condition exceeding a predetermined load; and a communication unit (12) configured to transmit, in order to cause the radio relay station (20) to connect to another base station that is not in an overload condition, information about the other base station to the radio relay station (20) when the control unit (11) detects that the own apparatus is in an overload condition.

## Claims

### Claim 1

A radio relay station configured to relay communications between a base station and a communication terminal, the radio relay station comprising
at least one memory storing instructions, and
at least one processor configured to execute the instructions to;
cancel, when the radio relay station receives a connection request message from a second base station that is different from a first base station that is in a connected state and in an overload condition exceeding a predetermined load, a connection to the first base station and
connect to the second base station.

### Claim 2 (depends on 1)

The radio relay station according to claim 1, wherein the at least one processor is further configured to execute the instructions to, with the second base station, establish an RRC connection and further configure an S1 interface and an X2 interface.

### Claim 3 (depends on 2)

The radio relay station according to claim 2, wherein the at least one processor is further configured to execute the instructions to receive information about the second base station through a Un interface.

### Claim 4 (depends on 2)

The radio relay station according to claim 2, wherein the at least one processor is further configured to execute the instructions to receive the information about the second base station by receiving the connection request message transmitted from the second base station.

### Claim 5

A communication method performed in a radio relay station configured to relay communications between a base station and a communication terminal, the communication method comprising:
receiving a connection request message from a second base station that is different from a first base station that is in a connected state and in an overload condition exceeding a predetermined load;
canceling a connection to the first base station; and
connecting to the second base station.