COMMUNICATION METHOD USING RELAY STATION IN MOBILE COMMUNICATION SYSTEM

• US 20100046413A1
• Filed: 12/13/2006
• Published: 02/25/2010
• Est. Priority Date: 12/13/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jeong Ki, Mun, Du Hyun, Han, Seung Hee, Jin, Yong Suk, Ryu, Ki Seon, Youn, Ae Ran, Kim, Beom Joon
• Granted Patent: US 9,042,293 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A communication method using a relay station (RS) in a mobile communication system is disclosed. A base station transmits identification information, which designates a position of a relay station region during at least one next frame, to a mobile subscriber station through the relay station, and the mobile subscriber station identifies the position of the relay station region during the at least one next frame. Thus, the mobile subscriber station does not need to synchronize with a relay station preamble to retrieve the relay station region for every frame, and a start point of the relay station region can be retrieved quickly and exactly even in the case that the position of the relay station region is varied.

Claims

1. A method for relaying data in a communication system including a relay station (RS), the method comprising:

transmitting a radio resource allocation message including first information and second information, the first information relating to radio resource allocation for transmitting data from the base station to the relay station by using an nth frame, and the second information relating to radio resource allocation for transmitting data from the relay station to a mobile subscriber station by using an (n+k)th frame; and

transmitting data from the base station to the relay station during the nth frame by using the radio resource allocated in accordance with the first information.

2. The method as claimed in claim 1, wherein the radio resource allocation message is a downlink map (DL-MAP) message.

3. The method as claimed in claim 2, wherein the first information and the second information are transmitted through at least one downlink map information element (DL-MAP IE) included in the downlink map message.

4. The method as claimed in claim 3, wherein the downlink map information element has a field indicating whether a radio resource is allocated by the downlink map information element during the nth frame or the (n+k)th frame.

5. The method as claimed in claim 1, wherein the radio resource is allocated in a burst mode.

6. The method as claimed in claim 1, wherein the k is 1.

7. The method as claimed in claim 1, farther comprising allocating the radio resource of the (n+k)th frame excluding the radio resource allocated by the first information.

8. A method for relaying data transmitted from a base station to a mobile subscriber station through a relay station (RS) in a communication system including, the method comprising:

receiving a radio resource allocation message including first information and second information, the first information relating to radio resource allocation for transmitting data from the base station to the relay station by using an nth frame, and the second information relating to radio resource allocation for transmitting data from the relay station to a mobile subscriber station by using an (n+k)th frame;

receiving data transmitted from the base station during the nth frame by using the radio resource allocated in accordance with the first information;

decoding the data;

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encoding the decoded data; and

transmitting the data to the mobile subscriber station during the (n+k)th frame by using the radio resource allocated in accordance with the second information.

9. A method of relaying, at a relay station, data transmitted from a base station to a mobile subscriber station, the method comprising:

receiving data from the base station by using an allocated downlink radio resource during a first frame;

transmitting downlink radio resource allocation information to mobile subscriber stations within a zone of the relay station by using a downlink map of a second frame; and

respectively transmitting data to the mobile subscriber stations within the relay station zone during the second frame by using a radio resource according to the radio resource allocation information.

10. The method as claimed in claim 9, wherein the data transmitted to the mobile subscriber stations during the second frame are generated by decoding the data received from the base station during the first frame and encoding the decoded data.

11. The method as claimed in claim 9, wherein the radio resource used to respectively transmit the data to the mobile subscriber stations during the second frame is excluded from use by the base station.

12. The method as claimed in claim 9, wherein the downlink radio resource allocation information transmitted to the mobile subscriber stations within the relay station zone is transmitted through a downlink map information element (DL-MAP IE).

13. The method as claimed in claim 12, wherein the downlink map information element (DL-MAP IE) includes an identifier of the relay station (RS_ID) and identifiers of the mobile subscriber stations (MS_ID) belonging to the relay station.

14. The method as claimed in claim 9, wherein the downlink radio resource allocation information is generated from the base station.

15. A relay communication method using a relay station to relay data transmission from a base station to a mobile subscriber station, the relay communication method comprising:

receiving data from the base station during a first frame;

transmitting radio resource allocation information for sub-frame of a second frame to the base station during the first frame;

transmitting radio resource allocation information of the sub-frame to mobile subscriber stations within a region; and

transmitting the data to the mobile subscriber stations within the region by using a radio resource according to the radio resource allocation information.

16. The relay communication method as claimed in claim 15, wherein the radio resource allocation information of the sub-frame is transmitted by using a downlink map (DL-MAP) of the sub-frame.

17. The relay communication method as claimed in claim 15, wherein the radio resource allocation information of the sub-frame is generated considering the channel status of each mobile subscriber station.

18. The relay communication method as claimed in claim 15, wherein the radio resource allocation information for the sub-frame of the second frame is transmitted through a feedback header.

19. The relay communication method as claimed in claim 18, further comprising receiving uplink radio resource allocation information for transmission of the feedback header by using an uplink map (UL-MAP) of the first frame.

20. The relay communication method as claimed in claim 15, wherein the data transmitted to the mobile subscriber stations during the second frame are generated by decoding the data received from the base station during the first frame and encoding the decoded data.

21. A communication method through a relay station (RS) in an OFDM/OFDMA communication system, the communication method comprising:

the base station allocating a relay station region through which the relay station transmit or receive data to/from at least one mobile subscriber station;

the base station transmitting downlink/uplink map (DL/UL-MAP) information for the relay station through a data burst region; and

the relay station transmitting downlink data to the at least one mobile subscriber station through the relay station region in accordance with the downlink/uplink map information received through the data burst region.

22. The communication method as claimed in claim 21, wherein a message for allocating the relay station zone is included in a preamble region of a frame.

23. The communication method as claimed in claim 21, wherein if there exist a plurality of relay stations for communication with the base station, downlink/uplink map information for each relay station is included in a single data burst for each relay station.

24. The communication method as claimed in claim 21, wherein if there exist a plurality of relay stations for communication with the base station, downlink/uplink map information for all the relay stations is included in a single data burst.

25. The communication method as claimed in claim 23, wherein the data burst for each relay station includes data for at least one mobile subscriber station for communication through each relay station.

26. A communication method in a mobile subscriber station through a relay station (RS) in an OFDM/OFDMA communication system, the communication method comprising:

receiving data through a downlink data burst region allocated through downlink map (DL-MAP) information for the relay station among a relay station region allocated for the mobile subscriber station from the relay station to transmit and receive data; and

transmitting the data through an uplink data burst region allocated through uplink map (UL-MAP) information for the relay station,

wherein the downlink/uplink map (DL/UL-MAP) information for the relay station is transmitted from the base station to the relay station through the data burst region.

27. The communication method as claimed in claim 26, wherein if there exist a plurality of relay stations for communication with the base station, downlink/uplink map information for each relay station is included in a single data burst for each relay station.

28. The communication method as claimed in claim 26, wherein if there exist a plurality of relay stations for communication with the base station, downlink/uplink map information for all the relay stations is included in a single data burst.

29. A communication method through a relay station in an OFDM/OFDMA mode communication system,

the communication method is characterized in that a base station transmits downlink/uplink map (DL/UL-MAP) information required to perform communication between the relay station and at least one mobile subscriber station through a data burst region.

30. A frame structure for performing communication through at least one relay station between a base station and at least one mobile subscriber station in an OFDM or OFDMA communication system, the frame structure comprising:

a preamble region including a message indicating a relay station region for allowing the at least one relay station to transmit and receive data for the at least one mobile subscriber station;

a data burst region to which downlink/uplink map (DL/UL-MAP)information for the at least one relay station is allocated; and

the relay station region designated by the message and allocated to allow the at least one relay station to transmit and receive the data for the at least one mobile subscriber station.

31. The frame structure as claimed in claim 30, wherein the downlink/uplink map information is included in a single data burst for each relay station.

32. The frame structure as claimed in claim 30, wherein the downlink/uplink map information for all the relay stations is included in a single data burst.

33. The frame structure as claimed in claim 31, wherein the data burst for each relay station further includes data for at least one mobile subscriber station which will perform communication through each relay station.

34. A method for designating a relay station region in a communication system, which performs communication through a relay station between a base station and at least one mobile subscriber station, the method comprising:

transmitting a first message including identification information from the base station to the relay station, the identification information indicating a position of a relay station region during at least one next frame; and

transmitting a second message including the identification information from the relay station to the at least one mobile subscriber station through a relay station region of a current frame.

35. The method as claimed in claim 34, wherein the identification information includes a start point of a relay station preamble (RS-preamble).

36. The method as claimed in claim 35, wherein the identification information includes an offset value from a specific reference point to a start point of a relay station preamble of the next frame.

37. The method as claimed in claim 35, wherein the identification information includes an offset value from a symbol position of the message to a start point of a relay station preamble of the next frame.

38. The method as claimed in claim 37, wherein the identification information further includes an offset value from a symbol position of the message to a start point of a relay station preamble of the current frame.

39. The method as claimed in claim 35, wherein the identification information includes an offset value from a specific reference point to a start point of a relay station preamble of the current frame and an offset value from the start point of the relay station preamble of the current frame to a start point of a relay station preamble of the next frame.

40. The method as claimed in claim 39, wherein the specific reference point is a symbol position of the message.

41. A method for searching a relay station region of a mobile subscriber station in a communication system, which performs communication through a relay station between a base station and at least one mobile subscriber station, the method comprising:

receiving a message including identification information from the relay station, the identification information indicating a position of a relay station region during at least one next frame through a relay station region of a current frame; and

searching a start point of the relay station region of the at least one next frame by using the identification information.

42. The method as claimed in claim 41, wherein the identification information includes a start point of a relay station preamble.

43. The method as claimed in claim 42, wherein the identification information includes an offset value from a specific reference point to a start point of a relay station preamble of the next frame.

44. The method as claimed in claim 42, wherein the identification information includes an offset value from a symbol position of the message to a start point of a relay station preamble of the next frame.

45. The method as claimed in claim 44, wherein the identification information further includes an offset value from a symbol position of the message to a start point of a relay station preamble of the current frame.

46. The method as claimed in claim 42, wherein the identification information includes an offset value from a specific reference point to a start point of a relay station preamble of the current frame and an offset value from the start point of the relay station preamble of the current frame to a start point of a relay station preamble of the next frame.

47. The method as claimed in claim 46, wherein the specific reference point is a symbol position of the message.