COMMUNICATION DURATION CONFIGURING METHOD, RELAY STATION, BASE STATION, AND MOBILE COMMUNICATION SYSTEM

• US 20130242771A1
• Filed: 09/07/2012
• Published: 09/19/2013
• Est. Priority Date: 03/12/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: OHTA, Yoshiaki, KAWASAKI, Yoshihiro, SUGIYAMA, Katsumasa, TAJIMA, Yoshiharu, TANAKA, Yoshinori
• Granted Patent: US 9,516,515 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/15585 by interference cancellation
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

A communication duration configuring method is used in a mobile communication system with a relay station for relaying wireless communications between a base station and a mobile station. The method includes: configuring at least one of a downlink communication duration in which the relay station receives a transmission signal from the base station while limiting a transmission of a signal from the relay station to the mobile station, and an uplink communication duration in which the relay station transmits the transmission signal to the base station while limiting a transmission of a signal from the mobile station to the relay station; measuring a self-interference amount in the relay station; and controlling a configuration of the communication duration according to the self-interference amount.

Claims

1. A communication duration configuring method in a mobile communication system with a relay station for relaying wireless communications between a base station and a mobile station, the method comprising:

configuring at least one of a downlink communication duration in which the relay station receives a transmission signal from the base station while limiting a transmission of a signal from the relay station to the mobile station, and an uplink communication duration in which the relay station transmits the transmission signal to the base station while limiting a transmission of a signal from the mobile station to the relay station;

measuring a self-interference amount in the relay station; and

controlling a configuration of the communication duration according to the self-interference amount.

2. The communication duration configuring method according to claim 1, wherein

the communication duration is configured when the self-interference amount is larger than a reference value, and the communication duration is not configured when the self-interference amount is equal to or less than the reference value.

3. The communication duration configuring method according to claim 1, further comprising:

notifying the relay station from the base station of candidate durations in which the communication duration can be configured; and

notifying the base station from the relay station of a selection result of the communication duration selected from among the candidate durations.

4. The communication duration configuring method according to claim 1 further comprising

transmitting an instruction to measure the self-interference amount from the base station to the relay station.

5. The communication duration configuring method according to claim 1, wherein

a radio frame including a guard interval is transmitted from the base station to the relay station when the communication duration is configured, and a radio frame without the guard interval is transmitted from the base station to the relay station when the communication duration is not configured.

6. The communication duration configuring method according to claim 1, further comprising

controlling transmission power of a downlink signal from the base station to the relay station according to the self-interference amount when a downlink transmission is performed from the base station to the relay station on the downlink communication duration.

7. A relay station which relays wireless communications between a base station and a mobile station, the relay station comprising:

a first transceiver configured to transmit and receive a signal to and from the base station;

a second transceiver configured to transmit and receive a signal to and from the mobile station;

a measurement unit configured to measure a self-interference amount; and

a controller which is able to configure at least one of a downlink communication duration in which the relay station receives a transmission signal from the base station while limiting a transmission of a signal from the relay station to the mobile station, and an uplink communication duration in which the relay station transmits the transmission signal to the base station while limiting a transmission of a signal from the mobile station to the relay station, wherein

the controller controls a configuration of the communication duration according to the self-interference amount.

8. The relay station according to claim 7, wherein

the controller configures the communication duration when the self-interference amount is larger than a reference value, and does not configure the communication duration when the self-interference amount is equal to or less than the reference value.

9. The relay station according to claim 7, wherein

the first transceiver receives from the base station a notification about candidate durations in which the communication duration can be configured, and notifies the base station of a selection result of the communication duration selected from among the candidate durations.

10. The relay station according to claim 7, wherein

the first transceiver receives an instruction to measure the self-interference amount from the base station.

11. The relay station according to claim 7, wherein

the first transceiver receives from the base station a radio frame including a guard interval when the communication duration is configured, and receives from the base station a radio frame without the guard interval when the communication duration is not configured.

12. The relay station according to claim 7, wherein

the measurement unit measures the self-interference amount based on an instruction from the base station.

13. A base station which performs wireless communications with a mobile station through a relay station, the base station comprising:

a transceiver configured to transmit and receive a signal to and from the relay station; and

a controller which is able to configure at least one of a downlink communication duration in which the relay station receives a transmission signal from the base station while limiting a transmission of a signal from the relay station to the mobile station, and an uplink communication duration in which the relay station transmits the transmission signal to the base station while limiting a transmission of a signal from the mobile station to the relay station, wherein

the transceiver receives from the relay station a measurement result of the self-interference amount,

the controller controls a configuration of the communication duration according to the self-interference amount.

14. The base station according to claim 13, wherein

the controller configures the communication duration when the self-interference amount is larger than a reference value, and does not configure the communication duration when the self-interference amount is equal to or less than the reference value.

15. The base station according to claim 13, wherein

the transceiver notifies the relay station of candidate durations for configuring of the communication duration, and receives from the relay station a selection result of the communication duration selected from among the candidate durations.

16. The base station according to claim 13, wherein

the transceiver transmits an instruction to measure the self-interference amount to the relay station.

17. The base station according to claim 13, wherein

the transceiver transmits to the relay station a radio frame including a guard interval when the communication duration is configured, and transmits to the relay station a radio frame without the guard interval when the communication duration is not configured.

18. The base station according to claim 13, wherein

the transceiver controls transmission power of a downlink signal to the relay station according to the self-interference amount when a downlink transmission is performed to the relay station on the downlink communication duration.

19. A mobile communication system with a relay station for relaying wireless communications between a base station and a mobile station, wherein

the relay station includes:

a controller which is able to configure at least one of a downlink communication duration in which the relay station receives a transmission signal from the base station while limiting a transmission of a signal from the relay station to the mobile station, and an uplink communication duration in which the relay station transmits the transmission signal to the base station while limiting a transmission of a signal from the mobile station to the relay station; and

a measurement unit configured to measure a self-interference amount in the relay station,

the controller controls a configuration of the communication duration according to the self-interference amount,

the base station includes abase station transceiver to transmit and receive a signal to and from the relay station based on the communication duration; and

the mobile station includes a mobile station transceiver to transmit and receive a signal to and from the relay station based on the communication duration.

20. A mobile communication system with a relay station for relaying wireless communications between a base station and a mobile station, wherein

the relay station includes:

a measurement unit configured to measure a self-interference amount in the relay station; and

a relay station transceiver configured to transmit a measurement result of the self-interference amount,

the base station includes;

a controller which is able to configure at least one of a downlink communication duration in which the relay station receives a transmission signal from the base station while limiting a transmission of a signal from the relay station to the mobile station, and an uplink communication duration in which the relay station transmits the transmission signal to the base station while limiting a transmission of a signal from the mobile station to the relay station; and

a base station transceiver to receive the measurement result of the self-interference amount from the relay station,

the controller controls a configuration of the communication duration according to the self-interference amount,

the mobile station includes a mobile station transceiver to transmit and receive a signal to and from the relay station based on the communication duration.