Technique for reduction of awake time in a wireless communication device utilizing slotted paging

• US 6,590,886 B1
• Filed: 07/17/1998
• Issued: 07/08/2003
• Est. Priority Date: 07/17/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Neufeld, Arthur J., Easton, Kenneth D.
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): KWOH, JASPER C
• Application Number:
  US09/118,750
• Time in Patent Office: 1,817 Days
• Field of Search: 370/320, 370/335, 370/342, 370/441, 370/479, 370/311, 455/38.3, 455/343, 455/574, 375/347, 375/349
• US Class Current: 370/342
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04B 2201/70709 with discontinuous detection
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention is an improved method and circuit for reducing the amount of time a mobile receiver spends in the active phase of a slot in a communications system utilizing a slotted paging mechanism. The invention allows the awake time to be configured for the minimum interval needed to demodulate the paging channel messages of interest. The invention includes a means to adjust the timing reference of the fingers to compensate for a sleep duration not an integral multiple of the PN sequence period, and a means to adjust the deinterleaver frame reference timing to compensate for a sleep duration not an integral multiple of the frame interval, and a means to initialize the frequency tracking, gain scaling, and DC bias loops, if any, of the analog receiver chain to minimize the time needed to re-lock these loops.

Claims

1. A method for receiving a page message in a slotted paging system comprising the steps of:

activating circuitry a time before a scheduled slot for the page message, wherein the time is equal to the duration of a PN sequence and the duration of the PN sequence is 26⅔

milliseconds;

deactivating circuitry once the page message indicates no further processing is necessary; and

wherein the activating circuitry step comprises demodulating a received signal at a PN start code time using a first demodulator finger and generating a delayed PN code delayed by 6⅔

miliseconds at a deinterleaver boundary using a second demodulator finger.

2. The method of claim 1 further comprising the step of decoding the page message.

3. The method of claim 1 wherein said page message indicates no further processing is necessary when said page message is directed to another subscriber unit.

4. A subscriber unit for receiving a page message in a slotted paging system comprising:

means for activating circuitry a time before a scheduled slot for the page message, wherein the time is equal to the duration of a PN sequence and the duration of the PN sequence is 26⅔

milliseconds;

means for deactivating said circuitry once the page message indicates no further processing is necessary; and

wherein the means for activating circuitry comprises means for demodulating a received signal at a PN start code time using a first demodulator finger and means for generating a delayed PN code delayed by 6⅔

milliseconds at a deinterleaver boundary using a second demodulator finger.

5. The subscriber unit of claim 4 further comprising means for decoding the page message.

6. The subscriber unit of claim 4 wherein said page message indicates no further processing is necessary when said page message is directed to another subscriber unit.

7. A method for intermittently receiving data in a mobile station containing a plurality of demodulating fingers comprising the steps of:

calculating a sleep duration which is a multiple of 26⅔

milliseconds;

programming a plurality of aligned fingers to a time reference;

programming one delayed finger to be delayed by 6⅔

milliseconds from said aligned fingers;

sleeping for said sleep duration; and

resetting a deinterleaver timer counter based on timing from said delayed finger.