Adaptive reacquisition time in a slotted paging environment

• US 6,101,173 A
• Filed: 03/16/1998
• Issued: 08/08/2000
• Est. Priority Date: 03/16/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Bayley, Gwain
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): YAO, KWANG BIN
• Application Number:
  US09/039,985
• Time in Patent Office: 876 Days
• Field of Search: 370/311, 370/335, 370/342, 370/350, 370/441, 370/479, 370/500, 370/503, 370/512, 370/515, 370/516, 375/138, 375/147, 375/148, 375/149, 375/150, 375/152, 375/226, 375/317, 375/362, 375/364, 375/367, 455/383, 455/343
• US Class Current: 370/311
• CPC Class Codes: H04B 1/70756 Jumping within the code, i.e. masking or slewing H04B1/70758 takes precedence
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and circuit for adaptively determining a pilot signal reacquisition time. A searcher subsystem measures a phase of the pilot signal. A control processor measures a magnitude of a shift in the pilot signal phase, compares the measured magnitude to a shift threshold, and decreases the reacquisition time if the measured magnitude is not greater than the shift threshold. The control processor also may compare the reacquisition time to a minimum reacquisition time, and decrease the reacquisition time only if the reacquisition time is greater than the minimum reacquisition time. Additionally, the control processor may increase the reacquisition time to a maximum reacquisition time if the measured magnitude is greater than said shift threshold.

Claims

1. A method for adaptively determining a pilot signal reacquisition time, the method comprising the steps of:

measuring a magnitude of a shift in phase of said pilot signal;

comparing said measured magnitude to a shift threshold; and

decreasing said reacquisition time if said measured magnitude is not greater than said shift threshold.

2. The method of claim 1 further comprising the steps of:

comparing said reacquisition time to a minimum reacquisition time; and

decreasing said reacquisition time only if said reacquisition time is greater than said minimum reacquisition time.

3. The method of claim 2 further comprising the step of increasing said reacquisition time to a maximum reacquisition time if said measured magnitude is greater than said shift threshold.

4. The method of claim 3 further comprising the step of entering a sleep mode until said reacquisition time before a next assigned paging slot.

5. A circuit for adaptively determining a pilot signal reacquisition time, comprising:

a searcher subsystem for measuring a phase of said pilot signal; and

a control processor for measuring a magnitude of a shift in said pilot signal phase, and wherein said control processor compares said measured magnitude to a shift threshold, and decreases said reacquisition time if said measured magnitude is not greater than said shift threshold.

6. The circuit of claim 5 wherein said control processor compares said reacquisition time to a minimum reacquisition time, and decreases said reacquisition time only if said reacquisition time is greater than said minimum reacquisition time.

7. The circuit of claim 6 wherein said control processor increases said reacquisition time to a maximum reacquisition time if said measured magnitude is greater than said shift threshold.

8. The circuit of claim 7 wherein said circuit enters a sleep mode until said reacquisition time before a next assigned paging slot.