Combined searching and page monitoring using offline sample storage

• US 20040202232A1
• Filed: 04/26/2004
• Published: 10/14/2004
• Est. Priority Date: 10/13/1998
• Status: Active Grant

• Current Assignee: Brian K. Butler, Edward G. Tiedemann Jr, Haitao Zhang
• Original Assignee: Brian K. Butler, Edward G. Tiedemann Jr, Haitao Zhang
• Inventors: Tiedemann, Edward G. Jr., Zhang, Haitao, Butler, Brian K.
• Granted Patent: US 7,113,537 B2
• Time in Patent Office: Days
• 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. An apparatus for processing a full page, comprising:

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

means for storing the collected samples in a sample RAM;

means for searching the stored samples at various time offsets to detect a set of pilot channels;

means for demodulating the paging channels of the stored samples associated with the detected set of pilot channels;

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

means for activating finger elements to process a full page when a quick page has been determined.

2. An apparatus for processing a full page, comprising:

an RF/IF system configured to collect samples of an RF signal for a duration longer then a quick paging slot;

a RAM, coupled to the RF/IF system, configured to store the collected samples;

a searcher, coupled with the RAM, configured to search the stored samples at various time offsets to detect a set of pilot channels and to demodulate the paging channels of the stored samples associated with the detected set of pilot channels; and

a control unit, coupled with the searcher, configured to determine from the demodulated paging channels if a quick page has been received and to activate finger elements to process a full page when a quick page has been determined.