METHOD FOR CONTROLLING LOW-POWER STATE IN MOBILE HANDSET

• US 20080076485A1
• Filed: 09/25/2007
• Published: 03/27/2008
• Est. Priority Date: 09/27/2006
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: CHO, Sung-Rae, LEE, Hoo-Sung, KIM, Byung-Jo, PARK, Seong-Su
• Granted Patent: US 8,868,138 B2
• Time in Patent Office: Days
• US Class Current: 455/574
• CPC Class Codes: H04W 52/029 reducing the clock frequency of the controller
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Provided is a method for controlling a low-power state in a mobile handset. The method includes shifting from an active state to a low-power idle state by blocking power of modules for a mobile communication function and decreasing a frequency of a control clock when an inactive request of the mobile communication function is received; shifting from the low-power idle state to a low-power access state by increasing the frequency of the control clock when an additional service request is received; shifting from the low-power access state to the low-power idle state if an additional service request is not received any more; shifting from the low-power idle state to a suspension state by suspending the control clock when request is not received for predetermined time; and shifting from the suspension state to the low-power idle state when the input interrupt and the timer interrupt occur.

Claims

1. A method for controlling a low-power state in a mobile handset, comprising:

shifting from an active state to a low-power idle state by blocking power of modules for a mobile communication function and decreasing a frequency of a control clock when an inactive request of the mobile communication function is received from a user;

shifting from the low-power idle state to a low-power access state by increasing the frequency of the control clock when an additional service request is received from the user in the low-power idle state;

shifting from the low-power access state to the low-power idle state if the additional service request is not received any more in the low-power access state;

shifting from the low-power idle state to a suspension state by setting an input interrupt and a timer interrupt and suspending the control clock when a request from the user is not received for predetermined time in the low-power idle state; and

shifting from the suspension state to the low-power idle state when the input interrupt and the timer interrupt occur in the suspension state.

2. The method as recited in claim 1, further comprising:

shifting from the low-power access state, the low-power idle state or the suspension state, to the active state at every predetermined period; and

receiving absent messages and absent call records from a base station.

3. The method as recited in claim 1, further comprising:

shifting from the low-power access state, the low-power idle state or the suspension state, to the active state when a request from the user is received; and

receiving absent messages and absent call records from a base station.

4. The method as recited in claim 1, wherein a clock frequency in the low-power access state is from 50 to 150 MHz.

5. The method as recited in claim 4, wherein the clock frequency in the low-power idle state is from 0 to 50 MHz.

6. The method as recited in claim 5, wherein the clock frequency in the suspension state is 0 Hz.