SYSTEM AND METHOD FOR UPDATING A SLEEP ID OF A MOBILE STATION IN A BWA COMMUNICATION SYSTEM

• US 20080293422A1
• Filed: 08/07/2008
• Published: 11/27/2008
• Est. Priority Date: 08/17/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Sung-Jin, KANG, Hyun-Jeong, SON, Yeong-Moon, SON, Jung-Je, LIM, Hyoung-Kyu, KOO, Chang-Hoi
• Granted Patent: US 7,653,022 B2
• Time in Patent Office: Days
• US Class Current: 455/446
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system and method for updating a sleep identifier (SLPID) of a mobile station (MS) in a broadband wireless access (BWA) communication system having a sleep mode in which there is no transmission data and an awake mode in which there is transmission data. Upon recognizing a need to update an SLPID allocated to an MS in the sleep mode in the initial phase of the sleep mode, a base station (BS) reallocates a new SLPID to be allocated to the MS and transmits SLPID update information to the MS. Upon receiving the SLPID update information for its current SLPID during the sleep mode, the MS updates its current SLPID with the reallocated SLPID according to the received update information.

Claims

1. A method for updating a sleep identifier (SLPID) by a base station (BS) in a broadband wireless access (BWA) communication system, the method comprising the step of:

transmitting a message including SLPID update information to a mobile station (MS) in sleep mode operation when there is no traffic directed to the MS,

wherein the SLPID update information includes information on an old SLPID allocated to the MS and a new SLPID allocated to the MS for updating the old SLPID, and an SLPID is uniquely assigned by the BS whenever an MS is instructed to enter a sleep mode.

2. The method of claim 1, wherein the SLPID update information includes M bits, the first M/2 bits among M bits indicate the old SLPID, the last M/2 bits among M bits indicate the new SLPID, and M is an integer greater than 2.

3. The method of claim 2, wherein the message is a traffic indication (MOB_TRF-IND) message, and the MOB_TRF-IND message includes a negative indication when there is no traffic directed to the MS.

4. The method of claim 1, wherein the new SLPID is one of other SLPIDs different from the old SLPID, the other SLPIDs are empty SLPIDs, each of the empty SLPIDs is an SLPID, returned to the BS, which was previously allocated to other MS.

5. A system for updating a sleep identifier (SLPID) in a broadband wireless access (BWA) communication system, the system comprising:

a mobile station (MS) in sleep mode operation; and

a base station (BS) for transmitting a message including SLPID update information to the MS when there is no traffic directed to the MS,

wherein the SLPID update information includes information on an old SLPID allocated to the MS and a new SLPID allocated to the MS for updating the old SLPID, and an SLPID is uniquely assigned by the BS whenever an MS is instructed to enter a sleep mode.

6. The system of claim 5, wherein the SLPID update information includes M bits, the first M/2 bits among M bits indicate the old SLPID, the last M/2 bits among M bits indicate the new SLPID, and M is an integer greater than 2.

7. The system of claim 6, wherein the message is a traffic indication (MOB_TRF-IND) message, and the MOB_TRF-IND message includes a negative indication when there is no traffic directed to the MS

8. The system of claim 5, wherein the new SLPID is one of other SLPIDs different from the old SLPID, the other SLPIDs are empty SLPIDs, each of the empty SLPIDs is an SLPID, returned to the BS, which was previously allocated to other MS.

9. A method for updating a sleep identifier (SLPID), by a mobile station (MS) in sleep mode operation, in a broadband wireless access (BWA) communication system, the method comprising the steps of:

receiving, from a base station (BS), a message including SLPID update information including information on an old SLPID allocated to the MS and a new SLPID allocated to the MS for updating the old SLPID; and

updating the old SLPID to the new SLPID,

wherein the message is transmitted when there is no traffic directed to the MS, and an SLPID is uniquely assigned by the BS whenever an MS is instructed to enter a sleep mode.

10. The method of claim 9, wherein the SLPID update information includes M bits, the first M/2 bits among M bits indicate the old SLPID, the last M/2 bits among M bits indicate the new SLPID, and M is an integer greater than 2.

11. The method of claim 10, wherein the message is a traffic indication (MOB_TRF-IND) message, and the MOB_TRF-IND message includes a negative indication when there is no traffic directed to the MS.

12. The method of claim 9, wherein the new SLPID is one of other SLPIDs different from the old SLPID, the other SLPIDs are empty SLPIDs, each of the empty SLPIDs is an SLPID, returned to the BS, which was previously allocated to other MS.

13. A system for updating a sleep identifier (SLPID) in a broadband wireless access (BWA) communication system, the system comprising:

a base station (BS); and

a mobile station (MS) for receiving, from the BS, a message including SLPID update information including information on an old SLPID allocated to the MS and a new SLPID allocated to the MS for updating the old SLPID, and updating the old SLPID to the new SLPID,

wherein the MS is in sleep mode operation, the message is transmitted when there is no traffic directed to the MS, and an SLPID is uniquely assigned by the BS whenever an MS is instructed to enter a sleep mode.

14. The system of claim 13, wherein the SLPID update information includes M bits, the first M/2 bits among M bits indicate the old SLPID, the last M/2 bits among M bits indicate the new SLPID, and M is an integer greater than 2.

15. The system of claim 14, wherein the message is a traffic indication (MOB_TRF-IND) message, and the MOB_TRF-IND message includes a negative indication when there is no traffic directed to the MS.

16. The system of claim 13, wherein the new SLPID is one of other SLPIDs different from the old SLPID, the other SLPIDs are empty SLPIDs, each of the empty SLPIDs is an SLPID, returned to the BS, which was previously allocated to other MS.