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Method and system for predictive sensing of periodic intermittent interference

A periodic and sexy technology, applied in transmission systems, digital transmission systems, data exchange networks, etc., to achieve the effect of good intelligence and flexibility

Active Publication Date: 2009-10-14
GOOGLE TECHNOLOGY HOLDINGS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of these disclosures teach how to implement the detection mechanism, but the common theme is that each relies on knowledge of the electromagnetic properties of the PII such as on / off timing and center frequency

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  • Method and system for predictive sensing of periodic intermittent interference
  • Method and system for predictive sensing of periodic intermittent interference
  • Method and system for predictive sensing of periodic intermittent interference

Examples

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Embodiment Construction

[0018] While the specification concludes with claims defining the features of embodiments of the invention which are believed to be novel, it is believed that the invention will be better understood from the following description when considered in conjunction with the accompanying drawings in which the use of the same Reference sign.

[0019]Embodiments herein may provide improved CCA implementations (or new channel assessment algorithms) that allow WLAN, WiFi, or WiMAX devices to detect certain types of commonly encountered PII, such as microwave ovens. Once PII is detected and its timing determined (via a number of PII detection schemes), the methods and systems herein can modify the CCA threshold (or other relevant threshold) based on recent channel energy measurements that can be stored in a buffer. This threshold is typically lowered based on the average and peak energy levels during the most recently identified PII turn-on cycle in order to provide greater sensitivity t...

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Abstract

A method ( 10 or 40 ) or system ( 200 ) of predictive sensing of periodic intermittent interference (PII) can include the measuring ( 12 ) of energy on a channel for an indication of PII, determining ( 14 ) if a channel is currently in a PII on-cycle, and adjusting ( 16 ) a clear channel assessment threshold to a new threshold for improved sensitivity of the PII on-cycle. If a current energy level on the channel is below the new threshold and if a previous on-energy characteristic suggests that the current energy level will remain below the new threshold for a predetermined minimum period of time, then a clear channel indication can be provided ( 20 ). A busy channel indication is provided ( 45 ) when either the current energy level is above the new threshold or the previous on-energy characteristic suggests the current energy level will not remain below the threshold for predetermined minimum period of time.

Description

technical field [0001] The present invention relates to wireless communications, and more particularly to methods and systems for reliably detecting and avoiding intermittent interference (PII) on wireless devices. Background technique [0002] End users of Voice over WiFi systems may experience poor audio quality or even dropped calls when using handheld devices that cannot receive and decode speech and handle packets on noisy channels. For example, periodic intermittent interference (PII) emitted by a microwave oven can disrupt or damage access points and handheld devices implemented in accordance with the IEEE 802.11 standard (and operating in the 2.4GHz band) and their associated interfaces for network connectivity. Communication between entry points. Domestic microwave ovens use magnetrons, which typically operate at a duty cycle of about 50% over a period of 16.67 ms (1 / 60 Hz) in North America (20 ms, 1 / 50 Hz in the rest of the world). In other words, the timing char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/28
CPCH04W74/0808H04W52/18
Inventor 伊萨姆·R·马赫卢夫史蒂芬·P·埃梅奥特
Owner GOOGLE TECHNOLOGY HOLDINGS LLC