System and method for allocating safety channels in a broadband wireless access communication system

• US 20060009228A1
• Filed: 06/20/2005
• Published: 01/12/2006
• Est. Priority Date: 06/19/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Koo, Chang-Hoi, Lee, Sung-Jin, Son, Yeong-Moon, Kim, So-Hyun, Kang, Hyun-Jeong, Son, Jung-Je, Lim, Hyoung-Kyu
• Application Number:
  US11/156,510
• Publication Number:
  US 20060009228A1
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/20 for optimising the interference level
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A system and method for allocating a safety channel in a broadband wireless access (BWA) communication system including a serving base station (BS) for providing a service to a mobile station (MS) and neighbor BSs. Upon receiving a request for allocation of the safety channel from the MS, the serving BS sends a request for allocation of the safety channel to a target BS having the best channel condition among the neighbor BSs. Upon receiving information indicating possibility of allocating the safety channel from the target BS, the serving BS controls the MS such that the MS performs communication through the allocated safety channel. Upon detecting a need for receiving a safety channel, the MS sends, to the serving BS, information indicating that the MS should be allocated the safety channel, and receives a safety channel allocated according to a control signal from the serving BS.

Claims

1. A method for allocating a safety channel in a broadband wireless access (BWA) communication system including a serving base station (BS) for providing a service to a mobile station (MS) and neighbor BSs, the method comprising the steps of:

upon receiving a request for allocation of the safety channel from the MS, sending a request for allocation of the safety channel to a target BS having the best channel condition among the neighbor BSs; and

after sending the request for allocation of the safety channel, upon receiving information indicating that the safety channel can be allocated, controlling the MS to perform communication through the allocated safety channel.

2. The method of claim 1, wherein the channel condition is measured by the MS using an intensity of a signal received from each BS.

3. The method of claim 1, wherein the MS performs communication using the safety channel of the target BS.

4. The method of claim 1, further comprising the step of transmitting by the serving BS, to the target BS, information indicating whether the serving BS has allocated the safety channel.

5. The method of claim 1, further comprising the step of, if the target BS having the best channel condition cannot allocate the safety channel, selecting a neighbor BS having the next best channel condition and sending a request for allocation of the safety channel to the selected neighbor BS.

6. A method for allocating a safety channel in a broadband wireless access (BWA) communication system including a serving base station (BS) for providing a service to a mobile station (MS) and neighbor BSs, the method comprising the steps of:

upon receiving a request for allocation of the safety channel from the MS, sending a request for allocation of the safety channel to a target BS having the best channel condition among the neighbor BSs; and

after sending the request for allocation of the safety channel, upon receiving information indicating that the safety channel cannot be allocated, controlling the MS to perform handover from the serving BS to the target BS.

7. The method of claim 6, wherein the channel condition is measured by the MS using an intensity of a signal received from each BS.

8. The method of claim 6, further comprising the step of receiving, by the MS, a safety channel allocated from the serving BS after performing handover, and performing communication with the target BS.

9. The method of claim 6, wherein the MS performs fast ranging with the target BS, when performing handover.

10. The method of claim 6, wherein the MS, when performing handover, selects a plurality of handover candidate neighbor BSs, and the MS selects one of the handover candidate neighbor BSs as a target BS and performs handover to the target BS.

11. The method of claim 10, wherein the step of selecting, by the MS, a plurality of handover the handover candidate neighbor BSs comprises the step of selecting neighbor BSs having a reception signal intensity higher than a predetermined value.

12. A system for allocating a safety channel in a broadband wireless access (BWA) communication system, the system comprising:

a serving base station (BS) for, upon receiving a request for allocation of the safety channel, sending a request for allocation of the safety channel to a target BS having the best channel condition among the neighbor BSs, and upon receiving information indicating possibility of allocating the safety channel from the target BS, transmitting a control signal including control information to perform communication through the allocated safety channel; and

a mobile station (MS) for, upon detecting a need for receiving a safety channel, sending, to the serving BS, information indicating that the MS should be allocated the safety channel, and receiving a safety channel allocated according to the control signal from the serving BS.

13. The system of claim 12, wherein the channel condition is measured by the MS using an intensity of a signal received from each BS.

14. The system of claim 12, wherein MS performs communication using a safety channel of the target BS.

15. The system of claim 12, wherein the serving BS transmits, to the target BS, information indicating whether the serving BS has allocated a safety channel through which the serving BS performs communication with the MS.

16. The system of claim 12, wherein if the target BS having the best channel condition cannot allocate the safety channel, the serving BS selects a neighbor BS having the next best channel condition and sends a request for allocation of the safety channel to the selected neighbor BS.

17. A system for allocating a safety channel in a broadband wireless access (BWA) communication system, the system comprising:

a serving base station (BS) for, upon receiving a request for allocation of the safety channel, sending a request for allocation of the safety channel to a target BS having the best channel condition among the neighbor BSs, and upon receiving information indicating impossibility of allocating the safety channel from the target BS, transmitting a control signal to perform handover to the target BS; and

a mobile station MS for, upon detecting a need for receiving the safety channel, sending, to the serving BS, information indicating that the MS should be allocated the safety channel, and performing handover from the serving BS to the target BS according to the control signal from the serving BS to receive an allocated safety channel.

18. The system of claim 17, wherein the channel condition is measured by the MS using an intensity of a signal received from each BS.

19. The system of claim 17, wherein the MS is allocated a safety channel from the serving BS after performing handover, and performs communication with the target BS using the allocated safety channel.

20. The system of claim 17, wherein the MS performs fast ranging with the target BS to perform handover.

21. The system of claim 17, wherein the MS selects a plurality of handover candidate neighbor BSs, selects one of the handover candidate neighbor BSs as a target BS, and performs handover to the selected neighbor BS.

22. The system of claim 21, wherein the MS selects neighbor BSs having a reception signal intensity higher than a predetermined value in selecting target BSs among the handover candidate neighbor BSs.