RELAY STATION, TERMINAL AND BASE STATION IN CELLULAR SYSTEM, AND METHOD FOR RELAYING BETWEEN TERMINAL AND BASE STATION

• US 20090312030A1
• Filed: 05/22/2007
• Published: 12/17/2009
• Est. Priority Date: 05/22/2006
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lee, Hyo-Jin, Chung, Hyun-Kyu, Jeong, Byung-Jang, Ahn, Jae-Young, Lee, Hee-Soo, Kwon, Jae-Kyun
• Granted Patent: US 8,279,795 B2
• Time in Patent Office: Days
• US Class Current: 455/452.200
• 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

Abstract

Disclosed are a base station, a relay station, and a terminal according to a method for designing a cellular system for improving resource usage efficiency by reducing interference between relay stations and interference between the base station and the relay station. The relay station gets control signals that terminals served by the base station transmit, and registers terminals, levels of the control signals of which are bigger than a predetermined value, to a list of the interference terminals. The relay station checks an interference resource through resource allocation information of the base station, checks an available resource corresponding to a resource except the interference resource among a resource allocated by the base station, and allocates some of the available resource to the terminal.

Claims

1. A relay station for relaying between a terminal and a base station, comprising:

an interference terminal searcher searching interference terminals to write a list of the interference terminals, the interference terminals interfere with the relay station;

a resource manager checking an interference resource through resource allocation information of the base station to check an available resource, wherein the interference resource is a resource allocated to the interference terminals and the available resource is a resource allocated to the relay station except the interference resource; and

a relay resource allocator allocating some or all of the available resource to the terminal.

2. The relay station of claim 1, wherein the interference terminal searcher searches the interference terminals through control signals that terminals served by the base station transmit.

3. The relay station of claim 2, wherein the interference terminal searcher registers terminals, levels of the control signals of which are bigger than a predetermined value, to the list of the interference terminals.

4. The relay station of claim 1, further comprising a list transmitter transmitting the list of the interference terminals to the base station so that the base station executes resource allocation for terminals in a direction of increasing the available resource using the list of the interference terminals.

5. The relay station of claim 4, wherein the list transmitter transmits the list of the interference terminals to the base station if the available resource is smaller than a resource that the relay station needs.

6. The relay station of claim 5, further comprising a relay executer relaying between the base station and the terminal with a resource that the relay resource allocator allocates.

7. The relay station of claim 1, wherein the relay station is located in a boundary area of a cell that the base station controls.

8. The relay station of claim 7, wherein the resource allocated to the relay station is some of a resource used by the base station and is orthogonal with a resource used by an adjacent relay station of the relay station.

9. The relay station of claim 8, wherein coverage of the relay station is smaller than coverage of the base station.

10. A method for relaying between a terminal and a base station, comprising:

getting control signals that terminals served by the base station transmit;

registering terminals, levels of the control signals of which are larger than a predetermined value, to a list of the interference terminals;

receiving, from the base station, resource allocation information of the base station;

checking an interference resource through resource allocation information of the base station, wherein the interference resource is a resource allocated to the interference terminals;

checking an available resource, wherein the available resource is a resource allocated by the base station except the interference resource; and

allocating some or all of the available resource to the terminal.

11. The method of claim 10, further comprising:

relaying between the base station and the terminal with a resource allocated to the terminal.

12. The method of claim 11, further comprising:

transmitting the list of the interference terminals to the base station if the available resource is smaller than a resource that the relay station needs, so that the base station executes resource allocation for terminals in direction of increasing the available resource using the list of the interference terminals.

13. A terminal served by a base station, the terminal comprising:

an interference relay searcher searching interference relays to write a list of the interference relays, the interference relays interfere with the terminal;

a list transmitter transmitting the list of the interference relays to the base station; and

a communication unit obtaining some or all of a resource used by the base station except an interference resource used by the interference relays, to execute data communication with the base station through the obtained resource.

14. The terminal of claim 13, wherein the interference relay searcher searches the interference relays through a pilot signal or a preamble that relays transmit.

15. The terminal of claim 14, wherein the interference relay searcher registers relays, levels of the pilot signal or the preamble of which are larger than a predetermined value, to the list of the interference relays.

16. A method for a base station to allocate a resource by communicating with a terminal through a relay of a relay station, the method comprising:

receiving information of an interference terminal from the relay station; and

allocating, to the interference terminal, a resource except a resource that the relay station uses among a resource that the base station uses.

17. The method of claim 16, wherein receiving information of the interference terminal comprises:

receiving a list of interference terminals from the relay station.

18. A base station for communicating with a terminal through relay of a relay station, comprising:

an interference terminal list receiver receiving, from the relay station, a list of interference terminals; and

a cell resource allocator checking an available resource of the relay station through the list to perform resource allocation for the interference terminals so that the available resource of the relay station increases.

19. The base station of claim 18, wherein the cell resource allocator controls a resource allocation rate for the interference terminals.

20. The base station of claim 18, wherein the cell resource allocator controls communication power for the interference terminals.

21. The base station of claim 20, wherein the cell resource allocator performs resource allocation for the interference terminals so that the available resource of the relay station increases if a necessary resource for relay of the relay station is greater than the available resource.

22. The base station of claim 21, further comprising:

an interference relay list receiver receiving a list of interference relay stations from a terminal served by the base station,

wherein the cell resource allocator allocates, to the terminal transmitting the list of interference relay stations, a resource except a resource that the interference relay stations use among a resource that the base station uses.

23. A base station for serving a terminal, comprising:

an interference relay list receiver receiving a list of interference relay stations from a terminal; and

a cell resource allocator allocating, to the terminal, a resource except a resource that the interference relay stations use among a resource that the base station uses.