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Signaling bit detection with adaptive threshold

An adaptive threshold and threshold technology, applied in the field of signaling bits, can solve problems such as call loss, paging message loss, and increased wake-up time

Inactive Publication Date: 2008-02-13
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Falsely detecting the paging indicator bit as On when it is actually Off can lead to increased wake-up time while processing the paging channel without sending a message
Conversely, falsely detecting the paging indicator bit as Off when it is actually On can result in lost paging messages, which can result in lost calls

Method used

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  • Signaling bit detection with adaptive threshold
  • Signaling bit detection with adaptive threshold
  • Signaling bit detection with adaptive threshold

Examples

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Embodiment Construction

[0022] As used herein, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs.

[0023] FIG. 1 shows a wireless communication system 100 . The system 100 includes a number of base stations 110 that provide communication coverage for a number of wireless devices 120 . A base station is typically a fixed station that can communicate with wireless devices and may also be called a base transceiver system (BTS), node B, access point or some other terminology. A wireless device may be stationary or on the move, and may also be called a mobile station (MS), user equipment (UE), user terminal, handset, subscriber unit or some other terminology.

[0024] As shown in Figure 1, wireless devices may be dispersed throughout the system. Each user device may communicate with one or more base stations on...

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Abstract

For signaling detection using an adaptive threshold, the channel condition observed by a signaling bit (e.g., a paging indicator bit) is estimated (e.g., by a pilot strength estimate). A metric for the signaling bit is computed based on recovered symbols for the signaling bit and the estimated channel condition. An adaptive threshold is selected based on the estimated channel condition. A decision is derived for the signaling bit based on the metric, the adaptive threshold, and the estimated channel condition. Multiple threshold values may be derived for the adaptive threshold for multiple ranges of estimated channel condition, one threshold value for each range. A look-up table stores the threshold values and provides the proper adaptive threshold value for any given estimated channel condition.

Description

technical field [0001] This disclosure relates generally to communications, and more particularly to techniques for detecting signaling bits, such as paging indicator bits. Background technique [0002] Wireless devices, such as cellular telephones, in wireless communication systems are typically designed to operate in one of several modes, such as an "active" mode or an "air" mode, at any given time. In active mode, a wireless device may actively exchange data with one or more base stations in the system, eg, to conduct voice or data calls. In idle mode, the wireless device typically monitors the paging channel (PCH) for messages applicable to the wireless device. These messages may include paging messages to alert the wireless device of an incoming call and overhead messages to carry system and other information for the wireless device. [0003] In idle mode, the wireless device continues to consume power to monitor the signals transmitted by the base stations in the sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04W68/00
CPCH04L25/0224H04L25/0212H04W68/00H04L25/0202
Inventor 纳加布尚·库拉帕蒂马蒂亚斯·布雷勒
Owner QUALCOMM INC