METHOD AND SYSTEM FOR ACCESSING AN OCCUPIED WI-FI CHANNEL BY A CLIENT USING A NULLING SCHEME

摘要

A method and system for overriding Carrier-Sense-Multiple-Access/Collision-Avoidance (CSMA/CA) without harming the traffic that occupies the channel are provided. The system and method may include for example detecting at a communication node having a plurality of antennas, a preamble transmitted by a co-channel neighboring node operating in compliance with IEEE 802.11 standard within a clear channel assessment (CCA) range of the communication node; and setting uplink transmit weights of the antennas of the communication node, to isolate the communication node from the neighboring node after the neighboring node has transmitted the preamble, to allow the communication node to access the co-channel, by keeping a transmitted signal level of the communication node as received by the neighboring node, below the CCA signal level at one or more of the antennas of said neighboring node. The system may for example implement the method in software running on a baseband processor.

主权项

1. A communication node comprising:
a plurality of antennas; a plurality of radio circuitries configured to transmit and receive signals via the plurality of antennas; and a baseband processor, wherein said communication node is located within a clear channel assessment (CCA) range of a neighboring node, wherein the communication node and the neighboring node share a co-channel in compliance with an IEEE 802.11 standard, wherein the baseband processor is configured to set uplink transmit weights after said neighboring node has transmitted a preamble, for transmitting a signal power level of said communication node, as received by said neighboring node, below a signal power level associated with the CCA range, at one or more of the antennas of said neighboring node, and wherein said communication node is a station configured to be served by the access point (AP) serving said communication node, and the neighboring node is an AP which is serving its respective stations, and wherein said station and APs operate in compliance with the IEEE 802.11 standard.