Method and system for handoff between base stations supporting multi-profile operation in BWA system

• US 7,603,121 B2
• Filed: 08/04/2005
• Issued: 10/13/2009
• Est. Priority Date: 08/04/2004
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chang, Yong, Kim, Jun-Hyung, Kim, Jung-Won, Lim, Geun-Hwi, Park, Joon-Ho, Chang, Hong-Sung
• Primary Examiner(s): Feild; Joseph H
• Assistant Examiner(s): Nguyen; Huy D
• Application Number:
  US11/197,143
• Publication Number:
  US 20060030322A1
• Time in Patent Office: 1,531 Days
• Field of Search: 455/436, 455/437, 455/438, 455/439, 455/442, 370/331, 370/332
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0064 of control information between different access points
• CPC Class Codes: H04W 36/08 Reselecting an access point

Abstract

Disclosed is a method for performing handoff by a Mobile Station (MS) in a Broadband Wireless Access (BWA) communication system including a serving Base Station (BS) and at least one neighbor BS adjacent to the serving BS, the serving BS currently providing a service to the MS. The method including receiving physical layer information for communication from said at least one neighbor BS by the serving BS; combining by the serving BS the received physical layer information of said at least one neighbor BS, inserting the physical layer information into an advertisement message, and transmitting the advertisement message to the MS; and receiving by the MS the advertisement message, and performing a handoff according to the physical layer information of said at least one neighbor BS included in the advertisement message when the handoff occurs.

Claims

1. A method for supporting, by a Mobile Station (MS), a handoff between Base Stations (BSs) supporting different operation profiles in a Broadband Wireless Access (BWA) communication system including a serving BS and at least one neighbor BS adjacent to the serving BS, the serving BS currently providing a service to the MS, the method comprising:

receiving, by the serving BS, physical layer information for communication from the at least one neighbor BS;

combining, by the serving BS, the received physical layer information of the at least one neighbor BS;

inserting, by the serving BS, the physical layer information into a PHY Profile Indicator (ID) field of an advertisement message, the PHY Profile ID field indicating an operation profile for the at least one neighbor BS;

transmitting, by the serving BS, the advertisement message to the MS;

receiving, by the MS, the advertisement message; and

performing the handoff according to the physical layer information of the at least one neighbor BS included in the advertisement message by performing a channel synchronization process, and without performing an operation profile synchronization process according to a cell selection process.

2. The method in claim 1, wherein the physical layer information includes Fast Fourier Transform (FFT) size indicator (ID) information representing sizes of sub-channels used by at least one neighbor BS.

3. The method in claim 1, wherein the physical layer information includes bandwidth indicator (ID) information indicating each bandwidth used by the at least one neighbor BS.

4. The method in claim 1, wherein the physical layer information includes operation mode of a starting subchannelization of a frame indicator (ID) information used by the at least one neighbor BS.

5. The method in claim 1, wherein the physical layer information includes FA (Frequency Assignment) numbers indicator (ID) information used by the at least one neighbor BS.

6. The method in claim 1, wherein the advertisement message includes a Mobile Neighbor Advertisement (MOB_NBR-ADV) message broadcasted from the serving BS.

7. A method for supporting, by a Mobile Station (MS), a handoff between Base Stations (BSs) supporting different operation profiles in a Broadband Wireless Access (BWA) communication system including a serving Base Station (BS) and at least one neighbor BS adjacent to the serving BS, the serving BS currently providing a service to the MS, the method comprising:

receiving, by the serving BS, physical layer information for communication from the at least one neighbor BS;

inserting the received physical layer information into a PHY Profile Indicator (ID) field of an advertisement message, the PHY Profile ID field indicating an operation profile for the at least one neighbor BS;

transmitting the advertisement message to the MS;

recognizing, by the MS, the physical layer information of the at least one neighbor BS included in the advertisement message; and

performing the handoff with a predetermined neighbor BS according to physical layer information corresponding to the predetermined neighbor BS, by performing a channel synchronization process, and without performing an operation profile synchronization process according to a cell selection process.

8. The method in claim 7, wherein the physical layer information includes Fast Fourier Transform (FFT) size indicator (ID) information representing sizes of sub-channels used by the at least one neighbor BS.

9. The method in claim 7, wherein the physical layer information includes bandwidth indicator (ID) information indicating each bandwidth used by the at least one neighbor BS.

10. The method in claim 7, wherein the physical layer information includes operation mode of a starting subchannelization of a frame indicator (ID) information used by the at least one neighbor BS.

11. The method in claim 7, wherein the physical layer information includes FA (Frequency Assignment) numbers indicator (ID) information used by at least one neighbor BS.

12. The method in claim 7, wherein the advertisement message includes a Mobile Neighbor Advertisement (MOB_NBR-ADV) message broadcasted from the serving BS.

13. A method for supporting a handoff between a Mobile Station (MS) and a target Base Station (BS) in a Broadband Wireless Access (BWA) communication system including a sewing BS currently providing a service to the MS and the target BS to which the MS is to be handed off, the serving BS and the target BS each supporting different operation profiles, the method comprising:

generating, by the sewing BS, a message including a PHY Profile Indicator (ID) field;

transmitting the message to the MS, the PHY Profile ID field representing an operation profile in use by the target BS;

receiving, by the MS, the message including the PHY Profile ID field from the serving BS, the field representing the target BS operation profile information required for the handoff;

recognizing, by the MS, the operation profile information for the target BS through the received message; and

performing the handoff to the target BS according to the information by performing a channel synchronization process, and without performing an operation profile synchronization process according to a cell selection process.

14. The method in claim 13, wherein the operation profile information includes information corresponding to a physical layer used in the target BS.

15. The method in claim 13, wherein the operation profile information includes Fast Fourier Transform (FFT) size indicator (ID) information representing sizes of sub-channels used in the target BS.

16. The method in claim 13, wherein the operation profile information includes bandwidth indicator (ID) information used by the target BS.

17. The method in claim 13, wherein the operation profile information includes operation mode of a starting subehannelization of a frame indicator (ID) information used by the target BS.

18. The method in claim 13, wherein the operation profile information includes FA (Frequency Assignment) numbers indicator (ID) information used by the target BS.

19. The method in claim 13, wherein the message including a field includes a Mobile Neighbor Advertisement (MOB_NBR-ADV) message and is broadcasted from the serving BS.

20. A method for performing handoff between Base Stations (BSs) supporting different operation profiles in a Broadband Wireless Access (BWA) system, the BWA system including a Mobile Station (MS) and a serving Base Station (BS) providing a service to the MS, the method comprising:

receiving a message including a PHY Profile Indicator (ID) field from the serving BS currently providing the service, the PHY Profile ID field indicating an operation profile for at least one neighbor BS;

determining if the at least one neighbor BS can provide a required service based on the operation profile;

selecting a handoff target cell using the operation profile information of the at least one neighbor BSs, when the at least one neighbor BS can provide the required service;

selecting a target BS in the handoff target cell;

scanning the target BS in the handoff target cell;

performing channel synchronization with the target BS without performing an operation profile synchronization process with the target BS;

terminating the service from the serving BS; and

receiving the required service from the target BS.

21. The method in claim 20, wherein the operation profile information of the target BS is included in a Mobile Neighbor Advertisement (MOB_NBR-ADV) message, which includes information relating to at least one of a bandwidth, a Fast Fourier Transform (FFT) size, a sub-channel operation mode identifier (ID) and a channel number used by the target BS.

22. A system for supporting handoff between neighbor Base Stations (BSs) supporting different operation modes in a Broadband Wireless Access (BWA) system, the BWA system including a Mobile Station (MS) and a serving Base Station (BS) providing a service to the MS, the system comprising:

the serving BS for combining operation mode information corresponding to the neighbor BSs, generating a Mobile Neighbor Advertisement (MOB_NBR-ADV) message having a PHY Profile Indicator (ID) field, and transmitting the MOB_NBR-ADV message to the MS, the PHY Profile ID field representing the operation mode information for omitting a predetermined procedure in the handoff of the MS;

the MS for receiving the MOB_NBR-ADV message including the PHY Profile ID field representing the BS operation mode information, and for performing a handoff according to the operation mode information included in the MOB_NBR-ADV message for a predetermined target BS of the neighbor BSs by performing a channel synchronization process, and without performing an operation profile synchronization process according to a cell selection process; and

the neighbor BSs for transmitting operation mode information in use to the serving BS, and providing a service required by the MS through the channel synchronization process in the handoff of the MS.

23. The system in claim 22, wherein the operation mode information includes physical layer information used by the neighbor BSs.

24. The system in claim 22, wherein the operation mode information includes at least one of a bandwidth, a Fast Fourier Transform (FFT) size representing a sub-channel size, a sub-channel operation mode identifier (ID) and a channel number.