METHOD FOR RECEIVING SYSTEM INFORMATION

• US 20100177831A1
• Filed: 04/24/2008
• Published: 07/15/2010
• Est. Priority Date: 06/13/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jeong Ki, Ryu, Ki Seon, Kim, Yong Ho
• Granted Patent: US 8,289,904 B2
• Time in Patent Office: Days
• US Class Current: 375/259
• CPC Class Codes: H04W 48/12 using downlink control channel

Abstract

A method for a mobile station (MS) to acquire system information of other communication systems via an initial entry communication system in which the mobile station (MS) initially enters via a base station (BS) is disclosed. The BS can deliver system information using a message transmitted to the MS at each frame or at intervals of a periodic time. In other words, the BS delivers specific information indicating whether the system is supported or not in a message. If the system is supported, the BS transmits a message including the system information to the MS. During or after the initial entry, the BS may deliver the system information using messages communicated with the MS. Namely, the BS can voluntarily or on the MS′ demand transmit a message including the system information to the MS indicating whether the system is supported.

Claims

1. A method for receiving system information from a base station (BS) supporting a first communication system and a second communication system comprising:

searching a frequency band of the first communication system, and receiving a FCH (frame control header) including first information indicating if the second communication system is supported; and

receiving system information of the second communication system if the first information indicates that the second communication system is supported.

2. The method according to claim 1, wherein the system information is received via downlink MAP messages.

3. The method according to claim 2, wherein the FCH includes a count value indicating which one of the downlink MAP messages includes the system information.

4. The method according to claim 3, wherein:

the count value is subtracted by ‘

1’

each time any one of the downlink MAP messages is transmitted, and

if the count value becomes ‘

0’

at a specific frame, the count value is reset to an initial value at a next frame of the specific frame, the initial value being a value other than ‘

0’

.

5. The method according to claim 4, wherein the initial value is associated with a transmission (Tx) period of the system information.

6. The method according to claim 3, further comprising:

receiving the system information via a downlink MAP message of a frame at which the FCH is received if the count value is ‘

0’

.

7. The method according to claim 1, wherein the system information is received via DCD (downlink channel descriptor).

8. The method according to claim 7, wherein the DCD includes a second information indicating that the system information has been changed.

9. The method according to claim 1, wherein the system information is received via at least one of ranging response message, basic capability response message, system information response message, and authentication message.

10. The method according to claim 1, wherein the system information includes at least one of downlink center frequency information, base bandwidth information, information indicating a number of base bandwidths, FFT size information, cyclic prefix information, and frame duration code information, which are used in the second communication system.

11. The method according to claim 1, wherein the system information is transmitted by the base station (BS) using at least one of a broadcast scheme, a multicast scheme, and a unicast scheme.

12. A method for a mobile station (MS) to receive system information from a base station (BS) supporting a first communication system and a second communication system comprising:

searching a frequency band of the first communication system, and receiving a FCH (frame control header) including a first information indicating if the second communication system is supported;

transmitting a message including a second information indicating that the mobile station (MS) supports the second communication system if the first information indicates that the second communication system is supported.

receiving system information of the second communication system as a response to the message.

13. The method according to claim 12, wherein the message includes at least one of ranging request message, basic capability request message, system information request message, and authentication message.

14. The method according to claim 12, further comprising:

receiving a system information change message including changed system information if the system information is changed.

15. The method according to claim 12, wherein the system information includes at least one of downlink center frequency information, base bandwidth information, information indicating a number of base bandwidths, FFT size information, cyclic prefix information, and frame duration code information, which are used in the second communication system.