Combined searching and page monitoring using offline sample storage

• US 6,748,010 B1
• Filed: 10/13/1998
• Issued: 06/08/2004
• Est. Priority Date: 10/13/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zhang, Haitao, Butler, Brian K., Tiedemann, Edward G. Jr.
• Primary Examiner(s): Liu, Shuwang
• Application Number:
  US09/172,067
• Time in Patent Office: 2,065 Days
• Field of Search: 375/148, 375/149, 375/147, 375/142, 375/152, 370/335, 370/331, 370/311, 455/434
• US Class Current: 375/148
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/70752 Partial correlation
• CPC Class Codes: H04B 1/70775 Multi-dwell schemes, i.e. multiple accumulation times
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04W 68/025 Indirect paging

Abstract

A novel and improved method for performing paging is described. In one embodiment of the invention a searcher is used to detect spread spectrum signals. Samples received RF signals are stored in a sample buffer. During standby mode, the samples are gathered during paging slots assigned to the mobile. A set of searches are performed on the samples, and if pilot signals are detected additional demodulation is performed to detect paging messages. The resulting set of demodulation data may be combined to increase detection. After a page message has been detected, additional demodulation resources may be activated to processes more complete page messages, or other information channels. In one embodiment of the invention, the searcher includes a demodulator to perform quick page detection without the use of finger elements to reduce idle mode power consumption.

Claims

1. A method for processing a full page, comprising:

collecting samples of an RF signal for a duration longer then a quick paging slot;

storing the collected samples in a sample RAM;

searching, by a searcher, the stored samples at various time offsets to detect a set of pilot channels;

demodulating, by the searcher, paging channels of the stored samples associated with the detected set of pilot channels;

determining from the demodulated paging channels if a quick page has been received; and

when the quick page has been determined, activating finger elements to process the full page.