Maintaining Communication Between Mobile Terminal and Network in Mobile Communication System

• US 20090011718A1
• Filed: 01/05/2007
• Published: 01/08/2009
• Est. Priority Date: 01/05/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Sung-Jun, Lee, Young-Dae, Chun, Sung-Duck, Jung, Myung-Cheul
• Granted Patent: US 8,644,250 B2
• Time in Patent Office: Days
• US Class Current: 455/70
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/25 Maintenance of established connections
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 92/10 between terminal device and access point, i.e. wireless air interface
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Maintaining communication between a mobile terminal and a network in a mobile communication system is achieved by determining a transition to one of a synchronized state and an unsynchronized state with a network while maintaining an active state with the network, and transitions to one of the synchronized state and the unsynchronized state according to the determination.

Claims

1. A method for maintaining communication between a mobile terminal and a network in a mobile communication system, the method comprising:

determining to transition to one of a synchronized state and an unsynchronized state with a network while maintaining an active state with the network; and

transitioning to one of the synchronized state and the unsynchronized state according to the determination.

2. The method of claim 1 wherein the determining step occurs upon expiration of a timer.

3. The method of claim 2, wherein the timer is started upon transmitting a signal.

4. The method of claim 1, wherein the determining step occurs when failing to receive a downlink control channel for a predetermined time period.

5. The method of claim 1 wherein the determining step occurs upon receiving a network command.

6. The method of claim 1, wherein the determining step occurs upon moving out of a service region.

7. The method of claim 1, wherein the determining step occurs upon moving into a new service region.

8. The method of claim 1, wherein the determining step occurs upon moving out of a service region and expiration of a timer.

9. The method of claim 1, wherein the determining step occurs upon moving over a certain distance.

10. The method of claim 1, wherein the determining step occurs upon reaching a certain moving speed.

11. The method of claim 1, wherein the determining step occurs upon unsuccessfully transmitting information on a random access channel (RACH) a certain number of times.

12. A method for managing a synchronized state of a mobile terminal in a mobile communication system, the method comprising:

transmitting first information to a network, wherein the first information is utilized by the network to determine whether the mobile terminal is in one of a synchronized state and an unsynchronized state with the network; and

receiving second information from the network according to the determined state of the mobile terminal.

13. The method of claim 12, wherein the second information comprises information related to adjusting a synchronization time between the mobile terminal and the network if the mobile terminal is determined to be in the unsynchronized state.

14. The method of claim 12, wherein the first information comprises a request to transition into an unsynchronized state.

15. The method of claim 12, wherein the first information comprises a request to transition into an unsynchronized state for a predetermined amount of time.

16. The method of claim 12, wherein the first information comprises a request to transition into a synchronized state.

17. A method for managing a synchronized state of a mobile terminal in a mobile communication system, the method comprising:

receiving first information from a network according to one of a synchronized and an unsynchronized state of a mobile terminal determined by the network, wherein the first information comprises information related to allocating a radio resource for communication between the mobile terminal and the network; and

transmitting second information according to the information related to allocating the radio resource.

18. The method of claim 17, wherein the first information comprises information related to adjusting a synchronization time between the mobile terminal and the network if the mobile terminal is determined to be in the unsynchronized state.