Wireless communication terminal and control method thereof

• US 20040192305A1
• Filed: 03/22/2004
• Published: 09/30/2004
• Est. Priority Date: 03/24/2003
• Status: Active Grant

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Namiki, Hideo, Oomori, Yoshiaki
• Granted Patent: US 7,502,613 B2
• Time in Patent Office: Days
• US Class Current: 455/435.1
• CPC Class Codes: H04W 60/02 by periodical registration
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A cellular phone includes a random number generator. When the cellular phone performs location registration operation, a time of executing location registration is determined by random numbers. Therefore, in a situation where a large number of cellular phones must perform location registration substantially simultaneously, an event where a large number of the location registration operations overlap with one another can be avoided. Hence, simultaneous concentration of loads on a network is eliminated, and stable communications between the cellular phones and an administrative server are maintained.

Claims

1. A wireless communication terminal, comprising:

a random number generator;

a timer; and

a controller for controlling the wireless communication terminal,

wherein the controller determines a time of executing location registration based on random numbers outputted from the random number generator.

2. The wireless communication terminal according to claim 1,

wherein the controller executes location registration when the wireless communication terminal is turned on, and thereafter, determines a time of executing location registration based on random numbers.

3. The wireless communication terminal according to claim 1,

wherein the controller determines a time of executing location registration based on random numbers when the wireless communication terminal moves from a no service area to a service area.

4. The wireless communication terminal according to claim 1,

wherein the controller determines a time of executing location registration based on random numbers when the wireless communication terminal moves to another location area.

5. The wireless communication terminal according to claim 1,

wherein each time interval between executions of location registration is a sum of a predetermined period of time set in the timer and a period of time determined by the random numbers.

6. The wireless communication terminal according to claim 1, further comprising:

a wireless communication unit; and

an input key unit.

7. A control method of a wireless communication terminal, comprising the steps of:

detecting whether or not the wireless communication terminal can communicate with a base station;

determining a time of executing location registration based on random numbers when the wireless communication terminal can communicate with the base station; and

executing location registration in accordance with the determined time.

8. The control method according to claim 7,

wherein location registration is repeatedly executed.

9. The control method according to claim 7, further comprising the step of generating random numbers by activating a random number generator when the wireless communication terminal can communicate with the base station.

10. The control method according to claim 7,

wherein, when the wireless communication terminal moves to another location area, a time of executing location registration is determined based on random numbers.

11. The control method according to claim 7,

wherein location registration is executed when power of the wireless communication terminal is switched on, and thereafter, a time of executing location registration is determined based on random numbers.

12. The control method according to claim 7,

wherein a time of executing location registration is determined based on random numbers when the wireless communication terminal moves from a no service area to a service area.

13. The control method according to claim 8,

wherein, when the wireless communication terminal remains in one location area, each time interval between executions of location registration is a sum of a predetermined period of time set in a timer and a period of time determined by random numbers.