Detecting, reporting and mitigating hidden nodes in a wireless data network
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United States of America Patent
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Feb 27, 2007
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N/A
app pub date -
May 10, 2002
filing date -
May 10, 2002
priority date (Note) -
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Abstract
A method for automatic hidden node detection that includes observing frame exchange sequences that conform to a MAC standard such as the IEEE 802.11 standard. The method includes detecting a hidden node upon receiving a response frame without previously receiving the frame causing the response. Similar conclusions may be drawn from longer frame sequences. When a hidden node has been detected with reasonable certainty, a hidden node report is sent to a hidden node manager. In one embodiment, the hidden node manager is centralized, and in another, the management function is performed in a distributed manner. Upon receiving a report, the hidden node manager automatically invokes hidden node avoidance measures by sending one or more action frames. In another embodiment, the hidden node manager turns on a hidden node mitigation method. In the case of the IEEE 802.11 standard, the hidden node manager turns on the IEEE 802.11 hidden node mitigation method based on RTS/CTS exchange.
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