Method for measuring and reporting channel quality in a broadband wireless access communication system

• US 20040219926A1
• Filed: 04/29/2004
• Published: 11/04/2004
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Koo, Chang-Hoi, Son, Yeong-Moon, Kim, So-Hyun, Son, Jung-Je
• Granted Patent: US 7,260,405 B2
• Time in Patent Office: Days
• US Class Current: 455/452.2
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements

Abstract

A method for measuring/reporting a channel quality in a broadband wireless access communication system. The method for reporting channel qualities of active BS and neighbor BSs measured by an MSS to the active BS when the MSS exists in a specific area covered by the active BS and neighbor BSs in a communication system includes the steps of: a) receiving channel quality report information indicative of channel periods of the channel qualities from the active BS, and receiving channel quality measurement information associated with individual channel qualities of the neighbor BSs and the active BS from the active BS; b) measuring SINRs of the neighbor BSs and the active BS according to the channel quality measurement information; and c) reporting the measured SINRs of the neighbor BSs and the active BS to the active BS.

Claims

1. A method for measuring channel qualities of an active BS (Base Station) and a plurality neighbor BSs when an MSS (Mobile Subscriber Station) is located in an area covered by the active BS and the plurality of neighbor BSs in a communication system including the MSS, the active BS for providing the MSS with a desired service, and the plurality of neighbor BSs being adjacent to the active BS, comprising the steps of:

a) transmitting channel quality measurement information needed for the MSS to measure channel qualities of the active BS and the neighbor BSs, from the active BS to the MSS;

b) transmitting neighbor BS-associated information associated with the neighbor BSs, from the active BS to the MSS; and

c) measuring at least one channel quality according to the channel quality measurement information of the active BS and the neighbor BSs associated with the neighbor BS-associated information.

2. The method as set forth in claim 1, wherein the channel quality measurement information includes a measurement start time at which a channel quality measurement operation begins, and a measurement duration for executing the channel quality measurement operation.

3. The method as set forth in claim 1, wherein the neighbor BS-associated information includes BS-IDs (Base Station Identifiers) for each of the neighbor BSs and physical channel frequencies for use in each of the neighbor BSs.

4. The method as set forth in claim 1, wherein the step (c) for measuring the at least one channel quality of the active BS and the neighbor BSs comprises the steps of:

c1) receiving reference channel signals received from the active BS and the neighbor BSs; and

c2) measuring SINRs (Signal to Interference and Noise Ratios) of the reference channel signals of the neighbor BSs.

5. The method as set forth in claim 1, further comprising the steps of:

d) if the MSS decides to change the channel quality measurement information to other information, transmitting channel quality measurement information to be changed, and a change request of the channel quality measurement information to the active BS; and

e) after receiving the channel quality measurement information change request, transmitting the changed channel quality measurement information, from the active BS to the MSS.

6. The method as set forth in claim 5, wherein the channel quality measurement information includes a measurement start time at which a channel quality measurement operation begins, and a measurement duration for executing the channel quality measurement operation.

7. The method as set forth in claim 6, wherein the MSS generates a change request signal of the measurement period contained in the channel quality measurement information.

8. A method for reporting channel qualities of an active BS (Base Station) and a plurality of neighbor BSs measured by an MSS (Mobile Subscriber Station) to the active BS when the MSS is located in an area covered by the active BS and the neighbor BSs in a communication system including the MSS, the active BS for providing the MSS with a desired service, and the plurality of neighbor BSs being adjacent to the active BS, comprising the steps of:

a) transmitting channel quality measurement information needed for the MSS to measure channel qualities of the active BS and the neighbor BSs, and other channel quality report information needed to report the channel qualities of the measured active BS and the measured neighbor BSs, from the active BS to the MSS;

b) measuring, by the MSS, at least one channel quality according to the channel quality measurement information of the active BS and the neighbor BSs associated with neighbor BS-associated information; and

c) transmitting the at least one channel qualities of the active BS and the neighbor BSs, from the MSS to the active BS, according to the other channel quality report information.

9. The method as set forth in claim 8, wherein the other channel quality report information identifies a specific time at which the at least one channel quality is reported.

10. The method as set forth in claim 9, wherein the channel quality report time is a predetermined setup period.

11. The method as set forth in claim 10, wherein the MSS transmits the at least one channel qualities of the active BS and the neighbor BSs to the active BS at intervals of the predetermined setup period.

12. The method as set forth in claim 9, wherein the step (b) for measuring the at least one channel qualities of the active BS and the neighbor BSs comprises the steps of:

b1) receiving reference channel signals received from the active BS and the neighbor BSs; and

b2) measuring SINRs (Signal to Interference and Noise Ratios) of the reference channel signals from the neighbor BSs.

13. The method as set forth in claim 12, wherein the channel quality report time is a specific time during which a SINR of a reference channel signal received from the active BS is determined to be lower than either one of the SINRs of the reference channel signals received from the neighbor BSs, such that a determined state is maintained during a predetermined time.

14. The method as set forth in claim 13, wherein the step (c) for transmitting the at least one channel qualities of the active BS and the neighbor BSs to the active BS according to the channel quality report information comprises the step of:

c1) transmitting a handover request signal to a neighbor BS which has a reference channel'"'"'s SINR higher than that of the active BS during the predetermined time.

15. The method as set forth in claim 8, wherein the channel quality measurement information includes a measurement start time at which a channel quality measurement operation begins, and a measurement duration for executing the channel quality measurement operation.

16. The method as set forth in claim 8, wherein the neighbor BS-associated information includes BS-IDs (Base Station Identifiers) for each of the neighbor BSs and physical channel frequencies for use in each of the neighbor BSs.

17. A method for reporting channel qualities of an active BS (Base Station) and a plurality of neighbor BSs measured by an MSS (Mobile Subscriber Station) to the active BS when the MSS is located in an area covered by the active BS and the neighbor BSs in a communication system including the MSS, the active BS for providing the MSS with a desired service, and the plurality of neighbor BSs being adjacent to the active BS, comprising the steps of:

a) transmitting channel quality measurement information needed for the MSS to measure channel qualities of the active BS and the neighbor BSs, and other channel quality report information needed to report the channel qualities of the measured active BS and the measured neighbor BSs, from the active BS to the MSS;

b) measuring, by the MSS, at least one channel quality from the channel quality measurement information in association with the active BS and the neighbor BSs, associated with neighbor BS-associated information;

c) transmitting the at least one channel qualities of the active BS and the neighbor BSs, from the MSS to the active BS;

d) measuring, by the MSS, channel qualities of the active BS and the neighbor BSs according to the channel quality measurement information; and

e) transmitting the channel qualities of the measured active BS and the neighbor BSs, in response to the other channel quality report information, from the MSS to the active BS.

18. The method as set forth in claim 17, wherein the other channel quality report information identifies a specific time at which the channel quality is reported.

19. The method as set forth in claim 18, wherein the step (b) for measuring the at least one channel qualities of the active BS and the neighbor BSs comprises the steps of:

b1) receiving reference channel signals received from the active BS and the neighbor BSs; and

b2) measuring SINRs (Signal to Interference and Noise Ratios) of the reference channel signals of the neighbor BSs.

20. The method as set forth in claim 19, wherein the other channel quality report time identifies a specific time at which a magnitude order of SINRs of individual reference channel signals measured at the step (d) is different from other magnitude order of SINRs of reference channel signals of the neighbor BSs measured at the step (b).

21. The method as set forth in claim 17, wherein the channel quality measurement information includes a measurement start time at which a channel quality measurement operation begins, and a measurement duration for executing the channel quality measurement operation.

22. The method as set forth in claim 17, wherein the neighbor BS-associated information includes BS-IDs (Base Station Identifiers) for each of the neighbor BSs and physical channel frequencies for use in each of the neighbor BSs.

23. A method for reporting channel qualities of an active BS (Base Station) and a plurality of neighbor BSs measured by an MSS (Mobile Subscriber Station) to the active BS when the MSS is located in an area covered by the active BS and the neighbor BSs in a communication system including the MSS, the active BS for providing the MSS with a desired service, and the plurality of neighbor BSs being adjacent to the active BS, comprising the steps of:

a) receiving, from the active BS, channel quality report information indicative of channel periods of the channel qualities from the active BS, and receiving channel quality measurement information associated with individual channel qualities of the neighbor BSs and the active BS;

b) measuring SINRs (Signal to Interference and Noise Ratios) of the neighbor BSs and the active BS according to the channel quality measurement information; and

c) reporting the measured SINRs of the neighbor BSs and the active BS to the active BS according to a channel quality report period.

24. The method as set forth in claim 23, wherein the channel quality report information identifies a specific time at which the measured SINRs are reported to the active BS.

25. The method as set forth in claim 23, wherein the channel quality measurement information includes a measurement start time at which an operation for measuring SINRs of the neighbor BSs and the active BS begins, and a measurement duration during which the SINRs are measured.