System and method for transmitting and receiving a signal using multiple frequency bands in a wireless communication system

• US 20090221290A1
• Filed: 03/02/2009
• Published: 09/03/2009
• Est. Priority Date: 03/03/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chang, Yong-Bin, Jang, Jae-Hyuk, Lee, Sung-Jin, Son, Yeong-Moon, Cho, Jae-Hee, Oh, Chang-Yoon, Kang, Hyun-Jeong, Son, Jung-Je, Roh, Won-II, Jun, Byung-Wook
• Granted Patent: US 8,521,166 B2
• Time in Patent Office: Days
• US Class Current: 455/437
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

Disclosed is a system and a method of signal transmission/reception by a mobile station in a wireless communication system. The method includes: transmitting a first sub-band preparation indicator, which indicates that the mobile station has been prepared for transmission/reception of a signal through a first sub-band, to a base station through a primary band; transmitting a first sub-band failure indicator to the base station through the primary band upon detecting failure in transmitting the first sub-band preparation indicator; receiving sub-band information on a second sub-band, which is different from the first sub-band, from the BS through the primary band; and acquiring synchronization with the second sub-band, so as to enable transmission/reception of a signal through the second sub-band based on the sub-band information.

Claims

1. A method of signal transmission/reception by a mobile station in a wireless communication system, the method comprising the steps of:

transmitting a first sub-band preparation indicator, which indicates that the mobile station has been prepared for transmission/reception of a signal through a first sub-band, to a base station through a primary band;

transmitting a first sub-band failure indicator to the base station through the primary band upon detecting failure in transmitting the first sub-band preparation indicator;

receiving sub-band information on a second sub-band, which is different from the first sub-band, from the BS through the primary band; and

acquiring synchronization with the second sub-band, so as to enable transmission/reception of a signal through the second sub-band based on the sub-band information.

2. The method of claim 1, wherein the detecting of the failure in transmitting the first sub-band preparation indicator comprises the steps of:

transmitting a bandwidth request code, which requests bandwidth allocation for transmission of the first sub-band preparation indicator, and simultaneously starting a first timer waiting for reception of a response to the bandwidth request code;

determining if the response to the bandwidth request code is received before the first timer expires; and

when the response to the bandwidth request code is not received before the first timer expires, detecting the failure in transmitting the first sub-band preparation indicator.

3. The method of claim 2, wherein the step of determining if the response to the bandwidth request code is received before the first timer expires comprises the steps of:

when the response to the bandwidth request code is received before the first timer expires, transmitting the first sub-band preparation indicator and simultaneously starting a second timer waiting for reception of a response to the first sub-band preparation indicator;

determining if a response to the first sub-band preparation indicator is received before the second timer expires; and

when a response to the first sub-band preparation indicator is not received before the second timer expires, detecting the failure in transmitting the first sub-band preparation indicator.

4. The method of claim 1, wherein the sub-band information comprises a second sub-band identifier.

5. The method of claim 1, wherein the first sub-band preparation indicator is transmitted by using one of a bandwidth request header and uplink data.

6. A method of signal transmission/reception by a base station in a wireless communication system, the method comprising the steps of:

transmitting information on a first sub-band to a mobile station through a primary band;

detecting failure in receiving the first sub-band preparation indicator indicating that signal transmission/reception is possible through the first sub-band;

transmitting sub-band information on a second sub-band, which is different from the first sub-band, to the mobile station through the primary band upon detecting the failure in receiving the first sub-band preparation indicator; and

performing signal transmission/reception to/from the mobile station through the second sub-band based on the sub-band information.

7. The method of claim 6, wherein the detecting of the failure in receiving the first sub-band preparation indicator comprises the steps of:

transmitting information on the first sub-band, and simultaneously starting a first timer waiting for reception of the first sub-band preparation indicator;

determining if the first sub-band preparation indicator is received before the first timer expires; and

when the first sub-band preparation indicator is not received before the first timer expires, detecting the failure in receiving the first sub-band preparation indicator.

8. The method of claim 6, wherein the sub-band information comprises a second sub-band identifier.

9. The method of claim 6, wherein the first sub-band preparation indicator is transmitted by using one of a bandwidth request header and uplink data.

10. A signal transmission/reception system in a wireless communication system, the signal transmission/reception system comprising:

a base station; and

a mobile station for transmitting a first sub-band preparation indicator, which indicates that the mobile station has been prepared for transmission/reception of a signal through a first sub-band, to a base station through a primary band, transmitting a first sub-band failure indicator to the base station through the primary band upon detecting failure in transmitting the first sub-band preparation indicator, receiving sub-band information on a second sub-band, which is different from the first sub-band, from the BS through the primary band; and

acquiring synchronization with the second sub-band, so as to enable transmission/reception of a signal through the second sub-band based on the sub-band information.

11. The signal transmission/reception system of claim 10, wherein the mobile station performs:

transmitting a bandwidth request code, which requests bandwidth allocation for transmission of the first sub-band preparation indicator, and simultaneously starting a first timer waiting for reception of a response to the bandwidth request code;

determines if the response to the bandwidth request code is received before the first timer expires; and

when the response to the bandwidth request code is not received before the first timer expires, detecting the failure in transmitting the first sub-band preparation indicator.

12. The signal transmission/reception system of claim 11, wherein the mobile station performs:

when the response to the bandwidth request code is received before the first timer expires, transmitting the first sub-band preparation indicator and simultaneously starting a second timer waiting for reception of a response to the first sub-band preparation indicator;

determining if a response to the first sub-band preparation indicator is received before the second timer expires; and

when a response to the first sub-band preparation indicator is not received before the second timer expires, detecting the failure in transmitting the first sub-band preparation indicator.

13. The signal transmission/reception system of claim 10, wherein the sub-band information comprises a second sub-band identifier.

14. The signal transmission/reception system of claim 10, wherein the first sub-band preparation indicator is transmitted by using one of a bandwidth request header and uplink data.

15. A signal transmission/reception system in a wireless communication system, the signal transmission/reception system comprising:

a mobile station; and

a base station for transmitting information on a first sub-band to a mobile station through a primary band, detecting failure in receiving the first sub-band preparation indicator indicating that signal transmission/reception is possible through the first sub-band, transmitting sub-band information on a second sub-band, which is different from the first sub-band, to the mobile station through the primary band upon detecting the failure in receiving the first sub-band preparation indicator, and performing signal transmission/reception to/from the mobile station through the second sub-band based on the sub-band information.

16. The signal transmission/reception system of claim 15, wherein the base station performs:

transmitting information on the first sub-band, and simultaneously starting a first timer waiting for reception of the first sub-band preparation indicator;

determining if the first sub-band preparation indicator is received before the first timer expires; and

when the first sub-band preparation indicator is not received before the first timer expires, detecting the failure in receiving the first sub-band preparation indicator.

17. The signal transmission/reception system of claim 15, wherein the sub-band information comprises a second sub-band identifier.

18. The signal transmission/reception system of claim 15, wherein the first sub-band preparation indicator is transmitted by using one of a bandwidth request header and uplink data.

19. A method of signal transmission/reception between a mobile station and a base station in a wireless communication system, the method comprising the steps of:

entering a network through a primary band and acquiring synchronization with at least one sub-band different from the primary band by a mobile station;

transmitting an overlay mode preparation indicator, which indicates that the mobile station has prepared for data transmission/reception through the at least one sub-band, to the base station; and

transmitting and receiving a signal through the at least one sub-band by the mobile station and the base station in response to the overlay mode preparation indicator.

20. The method of claim 19, wherein the overlay mode preparation indicator is transmitted in a form of one of a control message of a Media Access Control (MAC) layer, a Channel Quality Indication (CQI) code defined to be used as the overlay mode preparation indicator according to each sub-band, and a pre-allocated code.

21. The method of claim 19, wherein the overlay mode preparation indicator is transmitted by using at least one of the primary band and the at least one sub-band.

22. The method of claim 19, wherein the overlay mode preparation indicator is a scramble code in which an identifier of the mobile station is scrambled.

23. The method of claim 20, wherein the control message of the MAC layer comprises at least one of a message type field indicating that it is the overlay mode preparation indicator, a sub-band bitmap field indicating that the at least one sub-band from among all sub-bands is prepared to be used for data transmission/reception, and a transaction identifier field.

24. The method of claim 20, wherein the pre-allocated code is a ranging code pre-allocated to the mobile station during one of the network entry process, a negotiation process of the overlay mode, a handover process.

25. The method of claim 24, wherein the pre-allocated code is transmitted using the at least one sub-band when ranging for the at least one sub-band is completed.

26. The method of claim 24, wherein, when the mobile station performs handover, the pre-allocated ranging code is transmitted through one of a primary band of a target base station and the at least one sub-band.

27. The method of claim 19, further comprising a step of receiving a response signal to the overlay mode preparation indicator from the base station in a form of one of a control message of a MAC layer, downlink data, and a ranging response message.

28. The method of claim 27, wherein the control message of the MAC layer comprises at least one of a message type field indicating that it is the response signal, a transaction identifier field, and an overlay mode indicator field indicating that it is a response to the overlay mode preparation indicator.

29. A signal transmission/reception system in a wireless communication system, the signal transmission/reception system comprising:

a mobile station; and

a base station,

wherein the mobile station enters a network through a primary band, acquires synchronization with at least one sub-band different from the primary band, and transmits an overlay mode preparation indicator, which indicates that the mobile station has prepared for data transmission/reception through the at least one sub-band, to the base station, and the mobile station and the base station transmit and receive a signal through the at least one sub-band in response to the overlay mode preparation indicator.

30. The signal transmission/reception system of claim 29, wherein the overlay mode preparation indicator is transmitted in a form of one of a control message of a Media Access Control (MAC) layer, a Channel Quality Indication (CQI) code defined to be used as the overlay mode preparation indicator according to each sub-band, and a pre-allocated code.

31. The signal transmission/reception system of claim 29, wherein the overlay mode preparation indicator is transmitted by using at least one of the primary band and the at least one sub-band.

32. The signal transmission/reception system of claim 29, wherein the overlay mode preparation indicator is a scramble code in which an identifier of the mobile station is scrambled.

33. The signal transmission/reception system of claim 30, wherein the control message of the MAC layer comprises at least one of a message type field indicating that it is the overlay mode preparation indicator, a sub-band bitmap field indicating that the at least one sub-band from among all sub-bands is prepared to be used for data transmission/reception, and a transaction identifier field.

34. The signal transmission/reception system of claim 30, wherein the pre-allocated code is a ranging code pre-allocated to the mobile station during one of the network entry process, a negotiation process of the overlay mode, a handover process.

35. The signal transmission/reception system of claim 34, wherein the pre-allocated code is transmitted using the at least one sub-band when ranging for the at least one sub-band is completed.

36. The signal transmission/reception system of claim 34, wherein, when the mobile station performs handover, the pre-allocated ranging code is transmitted through one of a primary band of a target base station and the at least one sub-band.

37. The signal transmission/reception system of claim 29, wherein the mobile station receives a response signal to the overlay mode preparation indicator from the base station in a form of one of a control message of a MAC layer, downlink data, and a ranging response message.

38. The signal transmission/reception system of claim 37, wherein the control message of the MAC layer comprises at least one of a message type field indicating that it is the response signal, a transaction identifier field, and an overlay mode indicator field indicating that it is a response to the overlay mode preparation indicator.

39. A method of performing ranging for a sub-band by a mobile station operating a primary band and the sub-band in a wireless communication system, the method comprising the steps of:

receiving a sub-band ranging code set from a base station;

transmitting a sub-band ranging code of the sub-band ranging code set to the base station through the sub-band; and

starting a timer waiting for a ranging response to the sub-band ranging code, and then receiving the ranging response through the primary band before the timer expires.

40. The method of claim 39, wherein the ranging response comprises at least one of the sub-band ranging code, information on a symbol area/sub-channel area/frame number in which the sub-band ranging code is transmitted, information on a band through which the sub-band ranging code is received, and an adjustment information result value for the sub-band ranging code.

41. The method of claim 39, wherein the adjustment information result value for the sub-band ranging code comprises at least one of a success code notifying a success in receiving the sub-band ranging code by the BS, an abort code notifying a failure in receiving the sub-band ranging code, and a continue code requiring readjustment and retransmission of a transmission parameter of the sub-band ranging code.

42. A method of performing ranging for a sub-band by a base station operating a primary band and the sub-band in a wireless communication system, the method comprising the steps of:

transmitting a sub-band ranging code set to a mobile station;

receiving a sub-band ranging code of the sub-band ranging code set from the mobile station through the sub-band;

detecting an adjustment information result value by determining adjustment information on the received sub-band ranging code; and

transmitting a ranging response including the adjustment information result value to the mobile station through the primary band.

43. The method of claim 42, wherein the ranging response comprises at least one of the sub-band ranging code, information on a symbol area/sub-channel area/frame number in which the sub-band ranging code is transmitted, and information on a band through which the sub-band ranging code is received.

44. The method of claim 42, wherein the adjustment information comprises information if the base station has received the sub-band ranging code, and information if the base station must transmit a parameter adjustment indication to the mobile station having transmitted the sub-band ranging code.

45. The method of claim 42, wherein the adjustment information result value comprises at least one of a success code notifying a success in receiving the sub-band ranging code by the BS, an abort code notifying a failure in receiving the sub-band ranging code, and a continue code requiring readjustment and retransmission of a transmission parameter of the sub-band ranging code.