Radio base station, relay station, and relay method

• US 20080108304A1
• Filed: 10/10/2007
• Published: 05/08/2008
• Est. Priority Date: 11/07/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Suga, Junichi
• Granted Patent: US 8,090,310 B2
• Time in Patent Office: Days
• US Class Current: 455/7
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

A disclosed relay station is provided between a radio base station and a radio terminal for relaying a radio signal. The relay station includes a receiving unit configured to receive data transmitted from the radio base station or the radio terminal; a storage unit configured to hold the data; and a transmitting unit configured to relay the data to the radio terminal or the radio base station, and resend the data originating from the relay station in the event that the data need to be resent.

Claims

1. A relay station provided between a radio base station and a radio terminal for relaying a radio signal, the relay station comprising:

a receiving unit configured to receive data transmitted from the radio base station or the radio terminal;

a storage unit configured to hold the data; and

a transmitting unit configured to relay the data to the radio terminal or the radio base station, and resend the data originating from the relay station in the event that the data need to be resent.

2. A relay station provided between a radio base station and a radio terminal for relaying a radio signal, the relay station comprising:

a receiving unit configured to receive data transmitted from the radio base station or the radio terminal; and

a reporting unit configured to report, to the radio base station, a reception result of the data.

3. The relay station according to claim 2, wherein:

the reporting of the reception result is achieved by not transmitting the received data to the radio base station or by transmitting the reception result as data to the radio base station.

4. The relay station according to claim 2, further comprising:

a transmitting unit configured to transmit the data to the radio terminal in the event that the receiving unit receives the data from the radio base station, and to transmit, to the radio base station, the data received by the receiving unit from the radio terminal.

5. The relay station according to claim 4, wherein:

the transmitting unit transmits, to the radio base station, the reception result of the data received by the relay station together with the reception result received from the radio terminal.

6. A radio base station for performing radio communication with a radio terminal via a relay station, the radio base station comprising:

a creating unit configured to create transmission control data defining a data transmission region from the relay station to the radio terminal and a data transmission region from the relay station to the radio base station in the event that the relay station receives data transmitted from the radio base station or from the radio terminal and the data is to be resent originating from the relay station; and

a transmitting unit configured to transmit the transmission control data.

7. A radio base station for performing radio communication with a radio terminal via a relay station, the radio base station comprising:

a control unit configured to receive a reception result of data, reported by the relay station, in the event that the relay station receives the data transmitted from the radio base station or from the radio terminal.

8. A relay station in a radio communication system provided with a transmitting station, the relay station, and a receiving station, the relay station comprising:

a reporting unit configured to determine whether there is an error in data received from the transmitting station and report, to the receiving station, an error determination result.

9. The relay station according to claim 8, wherein:

the reporting unit reports that there is an error in the data by not relaying the data to the receiving station; and

the reporting unit reports that there is no error in the data by relaying the data to the receiving station.

10. The relay station according to claim 8, wherein:

the reporting unit reports the error determination result with the use of a control signal or a control message.

11. The relay station according to claim 8, further comprising:

a storage unit configured to hold the data received from the transmitting station in the event that there is no error in the data; and

a transmitting unit configured to resend the data held in the storage unit in the event of receiving, from the receiving station, a resending request to resend the data received from the transmitting station.

12. A receiving station in a radio communication system provided with a transmitting station, a relay station, and the receiving station, the receiving station comprising:

a control unit configured to generate a report signal for reporting a resending request to the relay station in the event of receiving, from the relay station, an error determination result indicating that there is no error in data from the transmitting station received by the relay station, and determining that there is an error in the data transferred from the relay station to the receiving station.

13. The receiving station according to claim 12, further comprising:

a transmitting unit configured to transmit, to the transmitting station, a reception result indicating that the data is properly received in the event of receiving, from the relay station, the error determination result indicating that there is no error in the data received by the relay station, and

to transmit, to the transmitting station, the reception result indicating that the data is not properly received in the event of receiving, from the relay station, the error determination result indicating that there is an error in the data received by the relay station.

14. A relay station in a radio communication system provided with a transmitting station, the relay station, and a receiving station, the relay station comprising:

a reporting unit configured to report, to the transmitting station, a reception result of data received from the transmitting station; and

a transmitting unit configured to resend the data to the receiving station in the event of receiving a resending report from the transmitting station.

15. A transmitting station in a radio communication system comprising the transmitting station, a relay station, and a receiving station, the transmitting station comprising:

a receiving unit configured to receive, from the relay station, a reception result of data transmitted from the transmitting station and received by the relay station, and to receive, from the receiving station, a reception result of the data received by the receiving station; and

a control unit configured to determine whether to resend the data from the relay station to the receiving station or to resend the data from the transmitting station via the relay station to the receiving station, according to the contents received by the receiving station.

16. A relay station in a radio communication system comprising a transmitting station, the relay station, and a receiving station, the relay station comprising:

an error detecting unit configured to detect an error in data received from the transmitting station;

a transmitting unit configured to transfer the data to the receiving station in the event that the error detecting unit detects no errors from the data;

a receiving unit configured to receive, from the receiving station, a reception result of the data transferred to the receiving station; and

a control unit configured to generate a control signal to be sent to the transmitting station according to whether the error detecting unit detects an error and also according to the reception result.

17. A transmitting station in a radio communication system comprising the transmitting station, a relay station, and a receiving station, the transmitting station comprising:

a receiving unit configured to receive a control signal from the relay station; and

a reporting unit configured to report a resending request to the relay station to resend data in the event of determining, based on the control signal, that the data need to be resent originating from the relay station.

18. A relay method performed by a relay station provided between a radio base station and a radio terminal for relaying a radio signal, the relay method comprising the steps of:

receiving data transmitted from the radio base station or the radio terminal;

holding the data;

relaying the data to the radio terminal or the radio base station; and

resending the data originating from the relay station in the event that the data need to be resent.

19. A relay method performed by a relay station provided between a radio base station and a radio terminal for relaying a radio signal, the relay method comprising the steps of:

receiving data transmitted from the radio base station or the radio terminal; and

reporting, to the radio base station, a reception result of the data.