METHOD AND APPARATUS FOR UPDATING SYSTEM INFORMATION IN BROADBAND WIRELESS COMMUNICATION SYSTEM

• US 20100226389A1
• Filed: 03/05/2010
• Published: 09/09/2010
• Est. Priority Date: 03/05/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Sung, Doo-Hyun, Kim, Yong-Ho, Yuk, Young-Soo, Ryu, Ki-Seon, Cho, Hee-Jeong
• Granted Patent: US 8,625,630 B2
• Time in Patent Office: Days
• US Class Current: 370/465
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

A method for updating system information in a terminal in which data is transmitted by means of superframes, includes: receiving system information, scheduling periodicity information of the system information and changing information indicating changing status of the system information transmitted by means of a superframe header (SFH) from a base station; and updating the system information based on the changing information, wherein the SFH comprises a primary SFH including the changing information and a secondary SFH including at least one subpacket containing the system information, the scheduling periodicity information indicating a transmission periodicity of the subpacket is transmitted by means of the primary SFH or a predetermined subpacket, and when the terminal detects that a changed system information transmitted by means of the subpacket is not scheduled as indicated in the scheduling periodicity information, the terminal wakes up until the changed system information is received.

Claims

1. A method for updating system information in a terminal in which data is transmitted by means of superframes, the method comprising:

receiving system information, scheduling periodicity information of the system information and changing information indicating changing status of the system information transmitted by means of a superframe header (SFH) from a base station, and

updating the system information based on the changing information,

wherein the SFH comprises a primary SFH (P-SFH) including the changing information and a secondary SFH (S-SFH) including at least one subpacket containing the system information,

the scheduling periodicity information indicating a transmission periodicity of the subpacket is transmitted by means of the P-SFH or a predetermined subpacket, and

when the terminal detects that a changed system information transmitted by means of the subpacket is not scheduled as indicated in the scheduling periodicity information, the terminal wakes up until the changed system information is received.

2. The method of claim 1, wherein the S-SFH comprises three subpackets each having a different transmission periodicity and the changing information comprises a bitmap consist of three bits indicating a changing status of the three subpackets respectively, and

when any value of the subpackets is changed, a bit at a corresponding position in the bitmap is toggled or set to 1.

3. The method of claim 1, wherein the changing information comprises a change count which is incremented by 1 modulo 16 whenever any value of the subpacket is changed.

4. The method of claim 1 further comprising a step of storing the changing information, wherein the S-SFH comprises three subpackets each having a different transmission periodicity and the changing information including a change count and a bitmap consist of three bits indicating a changing status of the three subpackets respectively, and

wherein the step of updating the system information comprises comparing the received change count with a stored change count, and

updating the changed system information based on the bitmap, if there is a difference between the received change count and the stored change count.

5. The method of claim 1, wherein the step of receiving further receives transmission offset information indicating a distance between a superframe containing the subpacket and a superframe containing the scheduling periodicity information.

6. A method for updating system information in a terminal in which data is transmitted by means of superframes, the method comprising:

receiving system information, scheduling periodicity information of the system information and changing information indicating changing status of the system information transmitted by means of a superframe header (SFH) from a base station, and

updating the system information based on the changing information,

wherein the SFH comprises a primary SFH (P-SFH) including the changing information and a secondary SFH (S-SFH) including at least one subpacket containing the system information,

the scheduling periodicity information indicating a transmission periodicity of the subpacket is transmitted by means of a predetermined subpacket, and

when the terminal detects that a changed system information transmitted by means of the subpacket is not scheduled as indicated in the scheduling periodicity information, the terminal wakes up until the scheduling periodicity information is received through the predetermined subpacket and uses the scheduling periodicity information to update the system information.

7. The method of claim 6, wherein the S-SFH comprises three subpackets each having a different transmission periodicity and the changing information comprises a bitmap consist of three bits indicating a changing status of the three subpackets respectively, and

when any value of the subpackets is changed, a bit at a corresponding position in the bitmap is toggled or set to 1.

8. The method of claim 6, wherein the changing information comprises a change count which is incremented by 1 modulo 16 whenever any value of the subpacket is changed.

9. The method of claim 6 further comprising a step of storing the changing information, wherein the S-SFH comprises three subpackets each having a different transmission periodicity and the changing information including a change count and a bitmap consist of three bits indicating a changing status of the three subpackets respectively, and

wherein the step of updating the system information comprises comparing the received change count with a stored change count, and

updating the changed system information based on the bitmap, if there is a difference between the received change count and the stored change count.

10. The method of claim 6, wherein the step of receiving further receives transmission offset information indicating a distance between a superframe containing the subpacket and a superframe containing the scheduling periodicity information.

11. An apparatus for updating system information comprising:

a receiver for receiving system information and changing information indicating changing status of the system information transmitted by means of a superframe header (SFH) from a base station, and

a controller for updating the system information based on the changing information,

wherein the SFH comprises a primary SFH (P-SFH) including the changing information and a secondary SFH (S-SFH) including at least one subpacket containing the system information,

a scheduling periodicity information indicating transmission periodicity of the subpacket is received by means of a predetermined subpacket, and

when the controller detects that a changed system information transmitted by means of the subpacket is not scheduled as indicated in the scheduling periodicity information, the controller controls a system operation mode as wake-up mode until the changed system information is received.

12. The apparatus of claim 11, wherein the S-SFH comprises three subpackets each having a different transmission periodicity and the changing information comprises a bitmap consist of three bits indicating a changing status of the three subpackets respectively, and

when any value of the subpackets is changed, a bit at a corresponding position in the bitmap is toggled or set to 1.

13. The apparatus of claim 11, wherein the changing information comprises a change count which is incremented by 1 modulo 16 whenever any value of the subpacket is changed.

14. The apparatus of claim 11 further comprising a memory for storing the changing information, wherein the S-SFH comprises three subpackets each having a different transmission periodicity and the changing information including a change count and a bitmap consist of three bits indicating a changing status of the three subpackets respectively, and

the controller comparing the change count received by the receiver with a change count stored in the memory and updating the changed system information based on the bitmap, if there is a difference between the received change count and the stored change count.

15. The apparatus of claim 11, wherein the receiver receives transmission offset information indicating a distance between a superframe containing the subpacket and a superframe containing the scheduling periodicity information.