Relay station in mobile communication system, mobile station, and relay transmission method

• US 8,422,943 B2
• Filed: 02/26/2009
• Issued: 04/16/2013
• Est. Priority Date: 02/27/2008
• Status: Expired due to Fees

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Saito, Yoshiko, Aramaki, Takashi, Miyoshi, Kenichi, Hiramatsu, Katsuhiko, Imamura, Daichi, Horiuchi, Ayako, Kobayakawa, Yuichi, Taki, Hideshi
• Primary Examiner(s): Rego, Dominic E
• Application Number:
  US12/919,366
• Publication Number:
  US 20110105016A1
• Time in Patent Office: 1,510 Days
• Field of Search: 455/3.02, 455/427, 455/428, 455/430, 455/431, 455 7- 9, 455/11.1, 455/12.1, 455/13.1, 455/13.2, 455 14- 17, 340/425.1, 370/226, 370/293, 370/246, 370/274, 370/279, 370/315, 370/316, 370/492, 370/501
• US Class Current: 455/11.1
• CPC Class Codes: 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
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

Provided is a mobile communication system capable of eliminating the use of a control channel for transmitting specific area information and suppressing the overhead caused by a frequency change process for a mobile station to receive the specific area information. In the mobile communication system, a relay station (20) has a coverage area (21) (specific area) and relays and transmits, in the coverage area (21), a signal received from a base station (10) to a mobile station (30). The relay station (20) adds, to the signal received from the base station (10), the offset of any of a frequency offset, a time offset, and a power offset depending on a risk indicated by risk information in the coverage area (21) (specific area) and transmits the signal after the addition of the offset to the mobile station (30) located in the coverage area (21).

Claims

1. A relay station comprising:

a receiver configured to receive a signal from a base station covering a first coverage area;

an adder configured to add to the signal one of a frequency offset and a time offset, in accordance with a level shown by specific area information in a second coverage area partly or entirely included in the first coverage area, the level being a hazard level, a traffic condition, a permissible transmission power or a moving direction of a mobile station in the second coverage area; and

a transmitter configured to transmit the offset-added signal to the mobile station in the second coverage area, wherein;

a sign of the offset is determined in accordance with an increasing or a decreasing of the hazard level.

2. A mobile station comprising:

a receiver configured to receive, in a first coverage area, a signal transmitted from a base station covering the first coverage area, and that receives a signal relayed by a relay station in a second coverage area, partly or entirely included in the first coverage area; and

a detector configured to detect a level shown by specific area information in the second coverage area based on an offset, when one of a frequency offset and a time offset is added to the received signal, the level being a hazard level, a traffic condition, a permissible transmission power or a moving direction of a mobile station in the second coverage area, wherein;

a sign of the offset is determined in accordance with an increasing or a decreasing of the hazard level.

3. The mobile station according to claim 2, further comprising:

a combiner configured to combine the signal after an offset compensation based on the detected level, with the received signal transmitted from a base station.

4. A relay transmission method comprising:

adding to a signal received from a base station covering a first coverage area, one of a frequency offset and a time offset, in accordance with a level shown by specific area information in a second coverage area, partly or entirely included in the first coverage area, the level being a hazard level, a traffic condition, a permissible transmission power or a moving direction of a mobile station in the second coverage area; and

transmitting the offset-added signal to a mobile station in the second coverage area, wherein;

a sign of the offset is determined in accordance with an increasing or a decreasing of the hazard level.

5. A specific area reception method comprising:

receiving, in a first coverage area, a signal transmitted from a base station covering the first coverage area, and receiving a signal relayed by a relay station in a second coverage area, partly or entirely included in the first coverage area; and

when one of a frequency offset and a time offset is added to the received signal, detecting a level shown by specific area information in the second coverage area, based on the offset, the level being a hazard level, a traffic condition, a permissible transmission power or a moving direction of a mobile station in the second coverage area, wherein;

a sign of the offset is determined in accordance with an increasing or a decreasing of the hazard level.

6. A relay station comprising:

a receiver configured to receive a signal from a base station covering a first coverage area;

an adder configured to add to the signal one of a frequency offset and a time offset, in accordance with a level shown by specific area information in a second coverage area partly or entirely included in the first coverage area, the level being a hazard level, a traffic condition, a permissible transmission power or a moving direction of a mobile station in the second coverage area; and

a transmitter configured to transmit the offset-added signal to the mobile station in the second coverage area, wherein;

the frequency offset is added to the signal in accordance with the hazard level and the time offset is added to the signal in accordance with an increasing or a decreasing of the hazard level.

7. A mobile station comprising:

a receiver configured to receive, in a first coverage area, a signal transmitted from a base station covering the first coverage area, and that receives a signal relayed by a relay station in a second coverage area, partly or entirely included in the first coverage area; and

a detector configured to detect a level shown by specific area information in the second coverage area based on an offset, when one of a frequency offset and a time offset is added to the received signal, the level being a hazard level, a traffic condition, a permissible transmission power or a moving direction of a mobile station in the second coverage area, wherein;

the frequency offset is added to the signal in accordance with the hazard level and the time offset is added to the signal in accordance with an increasing or a decreasing of the hazard level.