Method and apparatus for updating system information in broadband wireless communication system

• US 8,625,630 B2
• Filed: 03/05/2010
• Issued: 01/07/2014
• Est. Priority Date: 03/05/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ryu, Ki-Seon, Sung, Doo-Hyun, Cho, Hee-Jeong, Kim, Yong-Ho, Yuk, Young-Soo
• Primary Examiner(s): Oveissi, David
• Application Number:
  US12/718,887
• Publication Number:
  US 20100226389A1
• Time in Patent Office: 1,404 Days
• Field of Search: None
• 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 via superframes, the method comprising:

receiving scheduling periodicity information of the system information and change information indicating a change in content of the system information, the received change information transmitted via a superframe header (SFH), the SFH comprising a primary SFH (P-SFH) including the change information and a secondary SFH (S-SFH) including at least one subpacket containing the system information, the received scheduling periodicity information indicating a transmission periodicity of the at least one subpacket;

updating the system information based on the received change information; and

waking up the terminal until the terminal receives information related to the updated system information when the terminal detects that the system information is not the updated system information.

2. The method of claim 1, wherein:

the S-SFH comprises three subpackets that each have a different transmission periodicity;

the received change information comprises a bitmap including three bits, each of the three bits indicating a changing status of one of the three subpackets; and

the method further comprising toggling or setting a bit at a corresponding position in the bitmap to 1 when a value of any of the three subpackets changes.

3. The method of claim 1, wherein the change information comprises a change count that is incremented by 1 modulo 16 when any value of the at least one subpacket changes.

4. The method of claim 1, further comprising:

storing the received change information in a memory, wherein the S-SFH comprises three subpackets that each have a different transmission periodicity and the change information includes a change count and a bitmap, the bitmap including three bits each indicating a changing status of one of the three subpackets,

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

wherein updating the system information is based on the bitmap when a difference between the received change count and the stored change count exists.

5. The method of claim 1, the method further comprising:

receiving transmission offset information indicating a distance between a superframe containing the at least one subpacket and a superframe containing the scheduling periodicity information.

6. The method of claim 1, wherein the scheduling periodicity information is received via the at least one subpacket.

7. An apparatus for updating system information, the apparatus comprising:

a receiver for receiving scheduling periodicity information of the system information transmitted via a superframe header (SFH) and change information indicating a change of content of the system information, the SFH comprising a primary SFH (P-SFH) including the change information and a secondary SFH (S-SFH) including at least one subpacket containing the system information, the received scheduling periodicity information indicating transmission periodicity of the at least one subpacket; and

a controller for;

updating the system information based on the received change information, and

waking up the terminal until the terminal receives information related to the updated system information when the controller detects that the system information is not the updated system information.

8. The apparatus of claim 7, wherein:

the S-SFH comprises three subpackets that each have a different transmission periodicity;

the received change information comprises a bitmap including three bits, each of the three bits indicating a changing status of one of the three subpackets; and

the controller is further for toggling or setting a bit at a corresponding position in the bitmap to 1 when a value of any of the three subpackets changes.

9. The apparatus of claim 7, wherein the received change information comprises a change count that is incremented by 1 modulo 16 when any value of the at least one subpacket changes.

10. The apparatus of claim 7, further comprising:

a memory for storing the received change information, wherein the S-SFH comprises three subpackets that each have a different transmission periodicity and the change information includes a change count that is received by the receiver and a bitmap including three bits, each of the three bits indicating a changing status of one of the three subpackets,

wherein the controller is further for;

comparing the received change count with a change count that is stored in the memory, and

updating the system information based on the bitmap when difference between the received change count and the stored change count exists.

11. The apparatus of claim 7, wherein the receiver is further for receiving transmission offset information indicating a distance between a superframe containing the at least one subpacket and a superframe containing the scheduling periodicity information.

12. The apparatus of claim 7, wherein the scheduling periodicity information is received via the at least one subpacket.