System and method for managing a band AMC subchannel in an orthogonal frequency division multiple access communication system

• US 20050201309A1
• Filed: 03/11/2005
• Published: 09/15/2005
• Est. Priority Date: 03/12/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Koo, Chang-Hoi, Shim, Jae-Jeong, Lee, Sung-Jin, Son, Yeong-Moon, Kim, So-Hyun, Park, Jung-Shin, Lim, Geun-Hwi, Kang, Hyun-Jeong, Son, Jung-Je, Lim, Hyoung-Kyu, Chang, Hong-Sung, Kang, Hyon-Goo, Hong, Seung-Eun
• Granted Patent: US 7,848,295 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method for allocating a band Adaptive Modulation and Coding (AMC) channel in a wireless communication system that divides a full frequency band into a plurality of subcarrier bands and includes subchannels, each of which is a set of a predetermined number of neighbor subcarrier bands. Upon recognizing a need for a band AMC channel, a subscriber station (SS) sends a request for allocation of the band AMC channel to a base station (BS). Upon receiving the band AMC channel allocation request, the BS determines if it can allocate the band AMC channel requested by the SS, considering a resource situation of the BS, and transmits information on the determination to the SS.

Claims

1. A method for requesting allocation of a band Adaptive Modulation and Coding (AMC) channel by a subscriber station (SS), in a wireless communication system that divides a full frequency band into a plurality of subcarrier bands, each of which is a set of a predetermined number of subbands, each of which is a set of a predetermined number of contiguous subcarriers, the method comprising the steps of:

recognizing a need for use of a band AMC channel;

measuring reception quality of bands;

making a list of bands having high reception quality according to the reception quality measurements;

sending a request for allocation of the band AMC channel to a base station (BS);

receiving a response to the request from the BS; and

transitioning to a state in which the SS uses a band AMC channel, according to the response.

2. The method of claim 1, wherein the SS compares the measured reception qualities with a reference value defined in the system, and makes the list of bands having reception quality higher than the reference value.

3. The method of claim 1, further comprising the step of transmitting a channel state response (CH_STA_RSP) message to send a report on quality of a current band AMC channel to the BS in response to a request from the BS or to send a request for allocation of a band AMC channel to the BS.

4. The method of claim 3, wherein the CH_STA_RSP message includes a list of bands having high reception quality, channel quality information (CQI) of bands included in the list, and band AMC channel allocation request information.

5. The method of claim 3, wherein the CH_STA_RSP message includes a reported channel type field including information on a type of a channel, a state of which the SS will report to the BS, information on a list of channels, a measured quality of each of which the SS reports to the BS, and state information of each channel included in the list.

6. The method of claim 5, wherein the reported channel type field includes information on a channel used when the SS communicates with the BS;

wherein the reported channel type includes a diversity channel, a band AMC channel, and a safety channel.

7. The method of claim 6, wherein the CH_STA_RSP message includes information on a channel identifier (ID) and a carrier-to-interference ratio (C/I) for each of the diversity channel, the band AMC channel, and the safety channel.

8. A method for allocating a band Adaptive Modulation and Coding (AMC) channel by a base station (BS), in a wireless communication system that divides a full frequency band into a plurality of subcarrier bands, each of which is a set of a predetermined number of subbands, each of which is a set of a predetermined number of contiguous subcarriers, the method comprising the steps of:

receiving a band AMC channel request from a predetermined subscriber station (SS) in a state in which the BS does not use a band AMC channel;

determining to allocate a band AMC channel to the SS in response to the request; and

transmitting band AMC channel allocation information corresponding to the determination result to the SS.

9. The method of claim 8, wherein if it is determined to allocate the band AMC channel to the SS, the BS transmits an indication message for indicating a possibility of allocating the band AMC channel and, after transmitting the indication message, allocating the band AMC channel to the BS.

10. The method of claim 8, wherein the request received from the SS is a channel state response (CH_STA_RSP) message transmitted by the SS to send a report on quality of its band AMC channel to the BS in response to a request from the BS or to send a request for allocation of a band AMC channel to the BS.

11. The method of claim 10, wherein the CH_STA_RSP message includes a list of bands having high reception quality, channel quality information (CQI) of bands included in the list, and band AMC channel allocation request information.

12. The method of claim 10, wherein the CH_STA_RSP message includes a reported channel type field representing information on a type of a channel, a state of which the SS will report to the BS, information on a list of channels, a measured quality of each of which the SS reports to the BS, and state information of each channel included in the list.

13. The method of claim 12, wherein the reported channel type field includes information on a channel used when the SS communicates with the BS;

wherein the reported channel type includes a diversity channel, a band AMC channel, and a safety channel.

14. The method of claim 10, wherein the CH_STA_RSP message includes information on a channel identifier (ID) and a carrier-to-interference ratio (C/I) for each of the diversity channel, the band AMC channel, and the safety channel.

15. The method of claim 8, wherein the BS transmits the band AMC channel allocation information includes a band AMC indication (BAND_AMC_IND) message indicating whether the BS can allocate the band AMC channel to the SS, in response to the request from the SS.

16. A method for requesting allocation of a band Adaptive Modulation and Coding (AMC) channel by a subscriber station (SS), in a wireless communication system that divides a full frequency band into a plurality of subcarrier bands, each of which is a set of a predetermined number of subbands, each of which is a set of a predetermined number of contiguous subcarriers, the method comprising the steps of:

sending a report on a state of a AMC channel to a base station (BS);

receiving a response to the report on the state of the band AMC channel from the BS; and

determining to use the band AMC channel according to the response.

17. The method of claim 16, wherein in a state in which the SS uses a band AMC channel, the SS transmits information on quality of its current band AMC channel upon one of recognizing a need for transmitting the report on the state of the current band AMC channel or upon receiving a request for the report on the state of the current band AMC channel from the BS.

18. The method of claim 17, wherein the BS transmits the request for the report on the state of the band AMC channel allocated to the SS through a channel state request (CH_STA_REQ) message.

19. The method of claim 18, wherein the CH_STA_REQ message includes a requested channel type field representing type information of a channel, a report on a state of which the BS desires to receive from the SS.

20. The method of claim 19, wherein the channel type information includes information on a channel used when the BS communicates with the SS;

wherein the channel type information represents a diversity channel, a band AMC channel, and a safety channel.

21. The method of claim 16, further comprising the steps of:

receiving the response from the BS through a band AMC indication (BAND_AMC_IND) message;

checking a set value of a band AMC indicator included in the BAND_AMC_IND message; and

determining to use a band AMC channel when the band AMC indicator has information indicating possibility of using the band AMC channel.

22. The method of claim 16, wherein the SS transmits a channel state response (CH_STA_RSP) message to send the report on quality of the current band AMC channel to the BS in response to the request from the BS.

23. The method of claim 22, wherein the CH_STA_RSP message includes a list of bands having high reception quality, channel quality information (CQI) of bands included in the list, and band AMC channel allocation request information.

24. The method of claim 22, wherein the CH_STA_RSP message includes a reported channel type field representing information on a type of a channel, a state of which the SS will report to the BS, information on a list of channels, a measured quality of each of which the SS reports to the BS, and state information of each channel included in the list.

25. The method of claim 24, wherein the reported channel type field includes information on a channel used when the SS communicates with the BS;

wherein the reported channel type includes a diversity channel, a band AMC channel, and a safety channel.

26. The method of claim 22, wherein the CH_STA_RSP message includes information on a channel identifier (ID) and a carrier-to-interference ratio (C/I) for each of the diversity channel, the band AMC channel, and the safety channel.

27. The method of claim 16, wherein the response received from the BS is a band AMC indication (BAND_AMC_IND) message.

28. The method of claim 27, wherein the BAND_AMC_IND message includes an information field indicating one of approval and disapproval, for the band AMC channel allocation request from the SS.

29. A method for allocating a band Adaptive Modulation and Coding (AMC) channel by a base station (BS), in a wireless communication system that divides a full frequency band into a plurality of subcarrier bands, each of which is a set of a predetermined number of subbands, each of which is a set of a predetermined number of contiguous subcarriers, the method comprising the steps of:

receiving band AMC channel information from a subscriber station (SS); and

determining to allocate a band AMC channel according to the received channel information.

30. The method of claim 29, further comprising the steps of:

transmitting an indication message including information corresponding to the determination result to the SS; and

allocating the band AMC channel to the SS according to the determination result.

31. The method of claim 30, wherein the band AMC channel information from the SS includes a channel state response (CH_STA_RSP) message, which is a report on a quality of a current band AMC channel in response to a request from the BS.

32. The method of claim 30, wherein the CH_STA_RSP message includes a list of bands having high reception quality, channel quality information (CQI) of bands included in the list, and band AMC channel allocation request information.

33. The method of claim 30, wherein the CH_STA_RSP message includes a reported channel type field representing information on a type of a channel, a state of which the SS will report to the BS, information on a list of channels, a measured quality of each of which the SS reports to the BS, and state information of each channel included in the list.

34. The method of claim 33, wherein the reported channel type field represents information on a channel used when the SS communicates with the BS;

wherein the reported channel type includes a diversity channel, a band AMC channel, and a safety channel.

35. The method of claim 30, wherein the CH_STA_RSP message includes information on a channel identifier (ID) and a carrier-to-interference ratio (C/I) for each of the diversity channel, the band AMC channel, and the safety channel.

36. The method of claim 30, wherein the CH_STA_RSP message is a message transmitted by the SS to send a request for allocation of a band AMC channel to the BS.

37. The method of claim 36, wherein the CH_STA_RSP message includes a list of bands having high reception quality, channel quality information (CQI) of bands included in the list, and band AMC channel allocation request information.

38. The method of claim 36, wherein the CH_STA_RSP message includes a reported channel type field representing information on a type of a channel, a state of which the SS will report to the BS, information on a list of channels, a measured quality of each of which the SS reports to the BS, and state information of each channel included in the list.

39. The method of claim 38, wherein the reported channel type field represents information on a channel used when the SS communicates with the BS;

wherein the reported channel type includes a diversity channel, a band AMC channel, and a safety channel.

40. The method of claim 39, wherein the CH_STA_RSP message includes information on a channel identifier (ID) and a carrier-to-interference ratio (C/I) for each of the diversity channel, the band AMC channel, and the safety channel.

41. The method of claim 29, further comprising the step of, upon recognizing a need for detecting a state of a band AMC channel, transmitting to the SS a request for a report on a state of a band AMC channel.

42. The method of claim 41, wherein the channel state report request is sent through a channel state request (CH_STA_REQ) message to the SS.

43. The method of claim 42, wherein the CH_STA_REQ message includes a requested channel type field representing type information of a channel, a report on a state of which the BS desires to receive from the SS.

44. The method of claim 43, wherein the channel type information includes information on a channel used when the BS communicates with the SS;

wherein the channel type information represents a diversity channel, a band AMC channel, and a safety channel.

45. The method of claim 29, wherein the BS transmits the allocation information through a band AMC indication (BAND_AMC_IND) message.

46. The method of claim 45, wherein the BAND_AMC_IND message includes an information field indicating one of approval and disapproval for the band AMC channel allocation request from the SS.

47. A method for transmitting data through a channel set up between a subscriber station (SS) and a base station (BS), in a wireless communication system that divides a full frequency band into a plurality of subcarrier bands, each of which is a set of a predetermined number of subbands, each of which is a set of a predetermined number of contiguous subcarriers, the method comprising the steps of:

detecting a change in state of a current band Adaptive Modulation and Coding (AMC) channel allocated from the BS in the SS;

transmitting a channel state response (CH_STA_RSP) message to report the change to the BS;

receiving the CH_STA_RSP message;

determining, by the BS, if the BS can allocate a band AMC channel to the SS through the CH_STA_RSP message;

transmitting a band AMC indication (BAND_AMC_IND) message including information indicating whether the BS allocates the band AMC channel to the SS;

receiving the BAND_AMC_IND message;

transmitting, by the SS, data to the BS using one of a diversity channel and the band AMC channel according to the received BAND_AMC_IND message.

48. The method of claim 47, further comprising the steps of:

if it is determined that the SS no longer needs to use the band AMC channel, transmitting, by the BS, the BAND_AMC_IND message including information indicating no possibility of using a band AMC channel to the SS, and releasing the band AMC channel in use; and

upon receiving the BAND_AMC_IND message, transmitting, by the SS, data to the BS using a diversity channel.

49. The method of claim 47, further comprising the step of transmitting, by the SS, the CH_STA_RSP message in response to a channel state request (CH_STA_REQ) message for a request for a report on a state of the current band AMC channel.

50. The method of claim 49, wherein the CH_STA_REQ message includes a requested channel type field including type information of a channel, a report on a state of which the BS desires to receive from the SS.

51. The method of claim 50, wherein the channel type information includes information on a channel used when the BS communicates with the SS;

wherein the channel type information represents a diversity channel, a band AMC channel, and a safety channel.

52. The method of claim 47, wherein for downlink data transmission from the BS to the SS, the BS transmits the data using a diversity channel if a size of the data is not greater than a predetermined threshold, and transmits the data using the band AMC channel if the size of the data is greater than the predetermined threshold.

53. The method of claim 47, wherein for uplink data transmission from the SS to the BS, the SS transmits the data using the band AMC channel.

54. The method of claim 47, wherein the CH_STA_RSP message includes a reported channel type field including information on a type of a channel, a state of which the SS will report to the BS, information on a list of channels, a measured quality of each of which the SS reports to the BS, and state information of each channel included in the list.

55. The method of claim 54, wherein the reported channel type field includes information on a channel used when the SS communicates with the BS;

wherein the reported channel type includes a diversity channel, a band AMC channel, and a safety channel.

56. The method of claim 47, wherein the CH_STA_RSP message includes information on a channel identifier (ID) and a carrier-to-interference ratio (C/I) for each of the diversity channel, the band AMC channel, and the safety channel.

57. The method of claim 47, wherein the BAND_AMC_IND message includes an information field indicating one of approval and disapproval for the band AMC channel allocation request from the SS.

58. A system for allocating a band Adaptive Modulation and Coding (AMC) channel in a wireless communication system that divides a full frequency band into a plurality of subcarrier bands, each of which is a set of a predetermined number of bands, each of which is a set of a predetermined number of contiguous subcarriers, the system comprising:

a subscriber station (SS) for transmitting a channel state response (CH_STA_RSP) message to request allocation of a band AMC channel for use of the band AMC channel and to transmit information on a current band AMC channel; and

a base station (BS) for transmitting a channel state request (CH_STA_REQ) message to detect a state of the band AMC channel currently used by the SS, receiving the CH_STA_RSP message, and transmitting a band AMC indication (BAND_AMC_IND) message to the SS in response to the received CH_STA_RSP message.

59. The system of claim 58, wherein if it is determined that the SS no longer needs to use the current band AMC channel, the BS transmits the BAND_AMC_IND message including information indicating no possibility of using the band AMC channel to the SS, and releases the band AMC channel used by the SS;

wherein upon receiving the BAND_AMC_IND message, the SS transmits data to the BS using a diversity channel.

60. The system of claim 58, wherein if it is determined that the SS no longer needs to use the current band AMC channel, the BS transmits the BAND_AMC_IND message including information indicating no possibility of using the band AMC channel to the SS, and releases the band AMC channel used by the SS;

wherein upon receiving the BAND_AMC_IND message, the SS receives data from the BS using a diversity channel.

61. The system of claim 58, wherein the CH_STA_REQ message includes a requested channel type field including type information of a channel, a report on a state of which the BS desires to receive from the SS.

62. The system of claim 61, wherein the channel type information includes information on a channel used when the BS communicates with the SS;

wherein the channel type information represents a diversity channel, a band AMC channel, and a safety channel.

63. The system of claim 58, wherein the SS and the BS exchange data between each other using one of a band AMC channel and a diversity channel according to information included in the BAND_AMC_IND message.

64. The system of claim 63, wherein for downlink data transmission from the BS to the SS, the BS transmits the data using the diversity channel if a size of the data is not greater than a predetermined threshold, and transmits the data using the band AMC channel if the size of the data is greater than the predetermined threshold.

65. The system of claim 63, wherein for uplink data transmission from the SS to the BS, the SS transmits the data using the band AMC channel.

66. The system of claim 58, wherein the CH_STA_RSP message includes a reported channel type field representing information on a type of a channel, a state of which the SS will report to the BS, information on a list of channels, a measured quality of each of which the SS reports to the BS, and state information of each channel included in the list.

67. The system of claim 66, wherein the reported channel type field includes information on a channel used when the SS communicates with the BS;

wherein the reported channel type includes a diversity channel, a band AMC channel, and a safety channel.

68. The system of claim 58, wherein the CH_STA_RSP message includes information on a channel identifier (ID) and a carrier-to-interference ratio (C/I) for each of the diversity channel, the band AMC channel, and the safety channel.

69. The system of claim 58, wherein the BAND_AMC_IND message includes an information field indicating one of approval and disapproval for the band AMC channel allocation request from the SS.