Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
2007-02-27
2007-02-27
To, Doris H. (Department: 2616)
Multiplex communications
Diagnostic testing
Fault detection
Reexamination Certificate
active
10142538
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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Goodall David S.
Lam Alex C. K.
Myles Andrew F.
Cisco Systems Wireless Networking (Australia) Pty Limited
Inventek
Rosenfeld Dov
To Doris H.
Tran Thien D.
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