METHOD FOR PERFORMING ACCESS PROCEDURE OF MOBILE COMMUNICATION TERMINAL IN DATA COMMUNICATION SYSTEM, AND MOBILE COMMUNICATION TERMINAL USING THE SAME

• US 20070127402A1
• Filed: 12/06/2006
• Published: 06/07/2007
• Est. Priority Date: 12/06/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: OH, Seon Ju
• Granted Patent: US 7,697,931 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method and system for performing an access procedure of a mobile communication terminal in a data communication system are disclosed. An exemplary method includes performing an access procedure with a network according to an established access type. The method then determines whether a failure of the access procedure has occurred. A counter value of an access control module is adjusted according to the determined result. Based on the magnitude of the adjusted counter value, the established access type may be abandoned, and another access type may be selected. Therefore, the access procedure suitable for the network environment is executed, such that the probability of success of the access procedure increases.

Claims

1. A method for performing an access procedure of a mobile communication terminal in a data communication system, the method comprising:

performing an access procedure with a network according to an established access type;

determining whether there is a failure of the access procedure;

adjusting a counter value of an access control module according to the determined result; and

determining a magnitude of the adjusted counter value, abandoning the established access type, and selecting another access type.

2. The method according to claim 1, wherein performing an access procedure with a network according to an established access type further comprises:

transmitting a data channel request message to the network;

receiving a first data uplink assignment message from the network in response to the data channel request message;

transmitting a data information request message to the network; and

receiving a second data uplink assignment message from the network in response to the data information request message.

3. The method according to claim 2, wherein determining whether there is a failure of the access procedure further comprises:

determining that the access procedure has failed in the event that at least one of the following conditions occurs;

the number of transmission times of the data channel request message increases;

the first data uplink assignment message is not received within a predetermined period of time;

the second data uplink assignment message is not received within a predetermined period of time; and

specific information contained in the second data uplink assignment message is different from information stored in the mobile communication terminal.

4. The method according to claim 1, wherein performing an access procedure with a network according to an established access type further comprises:

transmitting a data channel request message to the network; and

receiving a data uplink assignment message from the network in response to the data channel request message.

5. The method according to claim 4, wherein determining whether there is a failure of the access procedure further comprises:

determining that the access procedure has failed in the event that at least one of the following conditions occurs;

the number of transmission times of the data channel request message increases;

the data uplink assignment message is not received within a predetermined period of time; and

specific information contained in the data uplink assignment message is different from information stored in the mobile communication terminal.

6. The method according to claim 1, wherein adjusting a counter value of an access control module according to the determined result further comprises:

if the failure of the access procedure is determined, reducing the counter value; and

if the failure of the access procedure is not determined, increasing the counter value.

7. The method according to claim 6, wherein determining a magnitude of the adjusted counter value, abandoning the established access type, and selecting another access type further comprises:

if the counter value is less than a reference value, selecting another access type.

8. The method according to claim 1, wherein adjusting a counter value of an access control module according to the determined result further comprises:

if the failure of the access procedure is determined, increasing the counter value; and

if the failure of the access procedure is not determined, reducing the counter value.

9. The method according to claim 8, wherein determining a magnitude of the adjusted counter value, abandoning the established access type, and selecting another access type further comprises:

if the counter value is equal to or grater than a reference value, selecting another access type.

10. The method according to claim 1, wherein the access procedure is executed at an acknowledged mode of a Radio Link Control (RLC) layer.

11. The method according to claim 1, wherein:

if the data communication system is a General Packet Radio Service (GPRS) system, and the established access type is a first phase access type, another access type is indicative of a second phase access type; and

if the data communication system is the GPRS system, and the established access type is the second phase access type, another access type is indicative of the first phase access type.

12. A mobile communication terminal for performing an access procedure in a data communication system comprising:

a transceiver configured to perform an access procedure with a network according to an established access type, and to transmit and receive a predetermined message to and from the network during the access procedure;

an access control module configured to determine whether a failure occurs in the access procedure, and to adjust a counter value according to the determined result; and

a controller configured to generate a control signal according to the failure or success of the access procedure, the controller further configured to abandon the established access type according to a magnitude of the counter value and to select another access type.

13. The mobile communication terminal according to claim 12, wherein:

if a data channel request message is transmitted to the network, the transceiver receives a first data uplink assignment message from the network; and

if a data information request message is transmitted to the network, the transceiver receives a second data uplink assignment message from the network.

14. The mobile communication terminal according to claim 13, wherein the controller is further configured to determine that the access procedure has failed in the event that at least one of the following conditions occurs:

the number of transmission times of the data channel request message increases;

the first data uplink assignment message is not received within a predetermined period of time;

the second data uplink assignment message is not received within a predetermined period of time; and

specific information contained in the second data uplink assignment message is different from information stored in the mobile communication terminal.

15. The mobile communication terminal according to claim 12, wherein:

if a data channel request message is transmitted to the network, the transceiver receives a data uplink assignment message from the network.

16. The mobile communication terminal according to claim 15, wherein the controller is further configured to determine that the access procedure has failed in the event that at least one of the following conditions occurs:

the number of transmission times of the data channel request message increases;

the data uplink assignment message is not received within a predetermined period of time; and

specific information contained in the data uplink assignment message is different from information stored in the mobile communication terminal.

17. The mobile communication terminal according to claim 12, wherein:

the access control module is further configured to reduce the counter value if the failure of the access procedure is detected, and to increase the counter value if the failure of the access procedure is not detected; and

the controller is further configured to select another access type if the counter value of the access control module is less than a reference value.

18. The mobile communication terminal according to claim 12, wherein:

the access control module is further configured to increase the counter value if the failure of the access procedure is detected, and to reduce the counter value if the failure of the access procedure is not detected, and

the controller is further configured to select another access type if the counter value of the access control module is equal to or greater than a reference value.