SYSTEM AND METHOD FOR SIMULTANEOUS CO-CHANNEL ACCESS OF NEIGHBORING ACCESS POINTS
First Claim
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1. A communication node comprising:
- a plurality of antennas;
a plurality of radio circuits configured to transmit and receive in compliance with IEEE 802.11 standard; and
a baseband processor,wherein said plurality of radio circuits and antennas are located within a clear channel assessment (CCA) range of a number N neighboring nodes sharing a co-channel with the communication node,wherein the baseband processor is configured to set weights on the radio circuits such that spatial signatures are generated in both downlink and uplink transmissions, for allowing said communication node to access said co-channel, known by said communication node to be currently used by at least one of the N neighboring nodes, by reducing a power level of signals transmitted by said antennas, as received by said N neighboring nodes, below a CCA range power level,wherein said communication node is a nulling Access point (AP) and the neighboring nodes are nulled APs, and wherein the APs communicate in compliance with an IEEE 802.11 standard, wherein the nulling created by said nulling AP, are in both downlink and uplink toward to the nulled APs, andwherein the nulling AP performs channel estimation based on at least one field of the nulled AP'"'"'s preamble, calculates Rx null weights and uses reciprocity to create the downlink Tx null.
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Abstract
A system and method for overriding Carrier-Sense-Multiple-Access/Collision-Avoidance (CSMA/CA) and virtual carrier sense, without harming the traffic that occupies the channel is described herein. Further provided herein are measurements and qualifying criteria for performing the aforementioned channel sharing. The system and method may be based, for example, on opportunistic spatial isolation of nodes from each other and selectively implementing ultra-fast link adaptation.
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Citations
25 Claims
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1. A communication node comprising:
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a plurality of antennas; a plurality of radio circuits configured to transmit and receive in compliance with IEEE 802.11 standard; and a baseband processor, wherein said plurality of radio circuits and antennas are located within a clear channel assessment (CCA) range of a number N neighboring nodes sharing a co-channel with the communication node, wherein the baseband processor is configured to set weights on the radio circuits such that spatial signatures are generated in both downlink and uplink transmissions, for allowing said communication node to access said co-channel, known by said communication node to be currently used by at least one of the N neighboring nodes, by reducing a power level of signals transmitted by said antennas, as received by said N neighboring nodes, below a CCA range power level, wherein said communication node is a nulling Access point (AP) and the neighboring nodes are nulled APs, and wherein the APs communicate in compliance with an IEEE 802.11 standard, wherein the nulling created by said nulling AP, are in both downlink and uplink toward to the nulled APs, and wherein the nulling AP performs channel estimation based on at least one field of the nulled AP'"'"'s preamble, calculates Rx null weights and uses reciprocity to create the downlink Tx null. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method comprising:
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transmitting and receiving signals via a plurality of antennas and radio circuits in compliance with an IEEE 802.11 standard, located within a clear channel assessment (CCA) range of a number N neighboring nodes sharing a co-channel with the radio circuits; and setting weights on the radio circuits such that spatial signatures are generated in both downlink and uplink transmissions for allowing an access to said co-channel, known by said radio circuits to be currently used by at least one of the N neighboring nodes, by reducing a power level of the signals transmitted by said antennas, as received by said N neighboring nodes, below a CCA range power level, wherein said weights setting results in nulling the neighboring nodes being nulled APs, wherein the nulling is in both downlink and uplink toward the nulled APs, and wherein the nulling AP performs channel estimation based on at least one field of the nulled AP'"'"'s preamble, calculates Rx null weights and uses reciprocity to create the downlink Tx null. - View Dependent Claims (23, 24, 25)
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Specification