US 7,321,580 B1 | ||
Directional carrier sense medium access for wireless nodes | ||
Subramanian Ramanathan, Concord, Mass. (US); and Cesar A. Santivanez, Boston, Mass. (US) | ||
Assigned to BBN Technologies Corp., Cambridge, Mass. (US) | ||
Filed on Oct. 18, 2002, as Appl. No. 10/273,748. | ||
Int. Cl. H04Q 7/00 (2006.01) |
U.S. Cl. 370—339 [370/752; 370/329; 455/456.4] | 51 Claims |
1. In a wireless network of nodes, each of said nodes having a transceiver and a plurality of antennas in selective communication
with said transceiver, a computer-based method for controlling access to a transmission medium, said method comprising:
obtaining a packet for transmission at said transceiver of a transmitting node of said nodes, said packet including a destination
identifier of a receiving node of said nodes;
selecting a transmitting antenna from said plurality of antennas in response to said destination identifier;
switching to said transmitting antenna;
determining whether said transmission medium is free in a beam direction of said transmitting antenna; and
transmitting said packet from said transmitting antenna over said transmission medium when said transmission medium is free.
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