Appartus and method for negotiating frame offset between base station and relay station in broadband wireless communication system using multi-hop relay scheme

• US 20080212516A1
• Filed: 03/03/2008
• Published: 09/04/2008
• Est. Priority Date: 03/02/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chang, Young-Bin, Lee, Sung-Jin, Oh, Chang-Yoon, Kang, Hyun-Jeong, Son, Jung-Je, Lim, Hyoung-Kyu
• Granted Patent: US 8,040,830 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04B 7/15592 Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path cooperative diversity H04B7/024

Abstract

Provided are an apparatus and method for negotiating a frame offset between a Base Station (BS) and a Relay Station (RS) in a wireless communication system using a multi-hop relay scheme. A communication method of a superordinate station includes, upon detecting an initial access of an relay station, determining an offset value between a frame number used in the superordinate station and a frame number to be used in the relay station; generating a message including RS frame offset information corresponding to the offset value; and transmitting the generated message to the relay station. Accordingly, since the base station and the relay station share the frame offset, the base station can transmit a specific broadcast message in advance to the relay station by considering the frame offset, and the relay station can transmit data, which has to be transmitted in synchronization with the base station at the same time point or at the same frame number, to a Mobile Station (MS) at an exact time point.

Claims

1. A communication method of a superordinate station in a wireless communication system using a multi-hop relay scheme, the method comprising:

upon detecting an initial access of a relay station (RS), determining an offset value between a frame number used in the superordinate station and a frame number to be used in the relay station;

generating a message including RS frame offset information corresponding to the offset value; and

transmitting the generated message to the relay station.

2. The method of claim 1, wherein the message including the RS frame offset is one of a Subscriber station Basis Capability negotiation-REQuest-ReSPonse (SBC-REQ-RSP) message, a REGistration-REQuest-ReSPonse (REG-REQ-RSP) message, and an RS Configuration CoManD (RS_Config-CMD) message.

3. The method of claim 1, further comprising, upon generating broadcast data to be transmitted at a same time point by both the superordinate station and the relay station, determining a transmission time point, at which the broadcast data is transmitted to the relay station, by using processing delay times of a plurality of relay stations;

transmitting the broadcast data and a transmission frame number of the superordinate station to the relay stations at the determined transmission time point; and

transmitting the broadcast data to a Mobile Station (MS) at a frame corresponding to the transmission frame number of the superordinate station.

4. The method of claim 3, wherein the broadcast data is Multicast and Broadcast Service (MBS) data.

5. The method of claim 1, further comprising, upon generating a broadcast message to be transmitted at a same frame number by both the superordinate station and the relay station, determining a transmission time point, at which the broadcast message is transmitted to the relay station, by using frame offsets and processing delay times of a plurality of relay stations;

transmitting the broadcast message and the transmission frame number to the relay stations at the determined transmission time point; and

transmitting the broadcast message to a mobile station at a frame corresponding to the transmission frame number.

6. The method of claim 5, wherein the broadcast message is either a TRaFfic-INDication (TRF-IND) message or a PAGing-ADVertisement (PAG-ADV) message.

7. The method of claim 1, wherein the superordinate station is either a Base Station (BS) connected with the relay station or a superordinate RS.

8. A communication method of a Relay Station (RS) in a wireless communication system using a multi-hop relay scheme, the method comprising:

during an initial access of the relay station, receiving a message including a RS frame offset that indicates an offset value between a frame number used in a superordinate station and a frame number to be used in the relay station; and

determining a frame number of the relay station by using the RS frame offset.

9. The method of claim 8, wherein the message including the RS frame offset is one of a Subscriber station Basis Capability negotiation-REQuest-ReSPonse (SBC-REQ-RSP) message, a REGistration-REQuest-ReSPonse (REG-REQ-RSP) message, and an RS Configuration CoManD (RS_Config-CMD) message.

10. The method of claim 8, further comprising:

receiving, from the superordinate station, broadcast data and a transmission frame number of the superordinate station for the broadcast data;

determining a transmission time point of the broadcast data by using the RS frame offset and the transmission frame number of the superordinate station; and

transmitting the broadcast data to a Mobile Station (MS) at a frame corresponding to the determined transmission time point.

11. The method of claim 10, wherein the broadcast data is Multicast and Broadcast Service (MBS) data.

12. The method of claim 8, further comprising:

receiving, from the superordinate station, a broadcast message and an RS Transmission (Tx) frame number for the broadcast message; and

transmitting the broadcast message to a mobile station at a frame corresponding to the RS Tx frame number.

13. The method of claim 12, wherein the broadcast message is either a TRaFfic-INDication (TRF-IND) message or a PAGing-ADVertisement (PAG-ADV) message.

14. The method of claim 8, wherein the superordinate station is either a Base Station (BS) connected with the relay station or a superordinate relay station.

15. A communication method of a superordinate station in a wireless communication system using a multi-hop relay scheme, the method comprising:

upon detecting an initial access of a Relay Station (RS), determining an offset value between a frame number used in the superordinate station and a frame number to be used in the relay station;

determining a maximum waiting time by considering processing delay times of all relay stations including the connected relay station;

determining a waiting time of the relay station using the maximum waiting time;

generating a message which includes RS frame offset information corresponding to the offset value and information on the waiting time; and

transmitting the generated message to the relay station.

16. The method of claim 15, wherein the message is one of a Subscriber station Basis Capability negotiation-REQuest-ReSPonse (SBC-REQ-RSP) message, a REGistration-REQuest-ReSPonse (REG-REQ-RSP) message, and an RS Configuration CoManD (RS_Config-CMD) message.

17. The method of claim 15, wherein the step of determining the maximum waiting time comprises:

selecting a maximum processing delay time among the processing delay times of all relay stations; and

calculating the maximum waiting time by summing the maximum processing delay time and a frame offset of an relay station having the maximum processing delay time.

18. The method of claim 15, wherein the waiting time of the relay station is calculated by using an equation:

waiting time=the maximum waiting time−

a RS processing delay time−

a RS frame offset.

19. The method of claim 15, further comprising:

upon generating a broadcast message to be transmitted at a same frame number by both the superordinate station and the relay station, determining a transmission time point, at which the broadcast message is transmitted to the relay station, by using a transmission frame number of the broadcast message and the maximum waiting time;

transmitting the broadcast message to the relay stations at the determined transmission time point; and

transmitting the broadcast message to a Mobile Station (MS) at a frame corresponding to the transmission frame number.

20. The method of claim 19, wherein the broadcast message is either a TRaFfic-INDication (TRF-IND) message or a PAGing-ADVertisement (PAG-ADV) message.

21. A communication method of a relay station (RS) in a wireless communication system using a multi-hop relay scheme, the method comprising:

during an initial access of the relay station, receiving a message which includes a RS frame offset indicating an offset value between a frame number used in a superordinate station and a frame number to be used in the relay station and RS waiting time information for a specific broadcast message; and

determining a frame number of the relay station by using the RS frame offset.

22. The method of claim 21, wherein the message is one of a Subscriber station Basis Capability negotiation-REQuest-ReSPonse (SBC-REQ-RSP) message, a REGistration-REQuest-ReSPonse (REG-REQ-RSP) message, and an RS Configuration CoManD (RS_Config-CMD) message.

23. The method of claim 21, further comprising:

receiving the broadcast data from the superordinate station through a relay link; and

transmitting the broadcast message to a Mobile Station (MS) through an access link after waiting for the waiting time.

24. The method of claim 23, wherein the broadcast message is either a TRaFfic-INDication (TRF-IND) message or a PAGing-ADVertisement (PAG-ADV) message.

25. A superordinate station apparatus in a wireless communication system using a multi-hop relay scheme, the apparatus comprising:

a controller for, upon detecting an initial access of a relay station (RS), determining an offset value between a first frame number used in the superordinate station and a second frame number to be used in the relay station;

a message processor for generating a message including RS frame offset information corresponding to the offset value; and

a transmitter for transmitting the generated message to the relay station.

26. The apparatus of claim 25, wherein the message is one of a Subscriber station Basis Capability negotiation-REQuest-ReSPonse (SBC-REQ-RSP) message, a REGistration-REQuest-ReSPonse (REG-REQ-RSP) message, and an RS Configuration CoManD (RS_Config-CMD) message.

27. The apparatus of claim 25, further comprising:

a buffer for buffering broadcast data to be transmitted at a same time point by both the superordinate station and the relay station,

wherein the controller determines a transmission time point, at which the broadcast data is transmitted to the relay station, by using processing delay times of a plurality of relay stations, and

wherein the transmitter transmits to the relay stations the broadcast data and a transmission frame number of the superordinate station at the determined transmission time point, and transmits the broadcast data to a Mobile Station (MS) at a frame corresponding to the transmission frame number of the superordinate station.

28. The apparatus of claim 27, wherein the broadcast data is Multicast and Broadcast Service (MBS) data.

29. The apparatus of claim 25, further comprising:

a buffer for buffering broadcast data to be transmitted at a same frame number by both the superordinate station and the relay station,

wherein the controller determines a transmission time point, at which the broadcast message is transmitted to the relay station, by using frame offsets and processing delay times of a plurality of relay stations; and

wherein the transmitter transmits a broadcast message and the second frame number to the relay stations at the determined transmission time point, and transmits the broadcast message to a mobile station at a frame corresponding to the second frame number.

30. The apparatus of claim 29, wherein the broadcast message is either a TRaFfic-INDication (TRF-IND) message or a PAGing-ADVertisement (PAG-ADV) message.

31. The apparatus of claim 25, wherein the superordinate station is either a Base Station (BS) connected with the relay station or a superordinate relay station.

32. A relay station (RS) apparatus in a wireless communication system using a multi-hop relay scheme, the apparatus comprising:

a message processor for, during an initial access of the relay station, receiving a message including a RS frame offset that indicates an offset value between a frame number used in a superordinate station and a frame number to be used in the relay station; and

a controller for determining a frame number of the relay station by using the RS frame offset.

33. The apparatus of claim 32, wherein the message is one of a Subscriber station Basis Capability negotiation-REQuest-ReSPonse (SBC-REQ-RSP) message, a REGistration-REQuest-ReSPonse (REG-REQ-RSP) message, and an RS Configuration CoManD (RS_Config-CMD) message.

34. The apparatus of claim 32, further comprising:

a receiver for receiving, from the superordinate station, broadcast data and a transmission frame number of the superordinate station for the broadcast data,

wherein the controller determines a transmission time point of the broadcast data by using the RS frame offset and the transmission frame number of the superordinate station.

35. The apparatus of claim 34, further comprising a transmitter for transmitting the broadcast data to a Mobile Station (MS) at a frame corresponding to the determined transmission time point.

36. The apparatus of claim 34, wherein the broadcast data is Multicast and Broadcast Service (MBS) data.

37. The apparatus of claim 32, further comprising:

a receiver for receiving, from the superordinate station, a broadcast message and an RS Transmission (Tx) frame number for the broadcast message; and

a transmitter for transmitting the broadcast message to a mobile station at a frame corresponding to the RS Tx frame number.

38. The apparatus of claim 37, wherein the broadcast message is either a TRaFfic-INDication (TRF-IND) message or a PAGing-ADVertisement (PAG-ADV) message.