WIRELESS LANS AND NEIGHBORHOOD CAPTURE
First Claim
1. A method to enable overlapping first and second wireless LAN cells in a medium to have an equal chance at establishing a session on the medium, each cell including a respective plurality of member stations, comprising:
- transmitting by a first member station in the first cell, a timing packet containing a timestamp value;
receiving the timing packet at a second member station in the second cell;
interrupting transmissions by member stations in the first and second cells at a global channel release instant corresponding to said timestamp value; and
permitting member stations in the first and second cells to contend for access to said medium following said global channel release instant.
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Accused Products
Abstract
Overlapped wireless LAN cells in a medium have an equal chance at establishing a session on the medium. A first member station in the first cell transmits a timing packet containing a timestamp value, which is received at a second member station in the second cell. This synchronizes member stations in the first and second cells to interrupt transmissions at a global channel release instant corresponding to the timestamp value. The member stations in the first and second cells then have the opportunity to contend for access to the medium following the global channel release instant, using a slotted CSMA/CA access method. Each of the member stations in the first and second cells has a superframe clock that is synchronized based on the timestamp value, thereby establishing a periodic global channel release instant during each of a plurality of periodic superframes. The member stations can then periodically interrupt transmissions at the periodic global channel release instant to contend for the medium. The periodic global channel release instant occurs at intervals that are sufficiently close to meet delay and jitter restrictions for time-critical voice and video applications.
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Citations
20 Claims
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1. A method to enable overlapping first and second wireless LAN cells in a medium to have an equal chance at establishing a session on the medium, each cell including a respective plurality of member stations, comprising:
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transmitting by a first member station in the first cell, a timing packet containing a timestamp value;
receiving the timing packet at a second member station in the second cell;
interrupting transmissions by member stations in the first and second cells at a global channel release instant corresponding to said timestamp value; and
permitting member stations in the first and second cells to contend for access to said medium following said global channel release instant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multiple-cell wireless local area network including overlapping first and second wireless LAN cells in a medium, each cell including a respective plurality of member stations, comprising:
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a first member station in the first cell, transmitting a timing packet containing a timestamp value;
a second member station in the second cell receiving the timing packet;
said member stations in the first and second cells interrupting transmissions at a global channel release instant corresponding to said timestamp value; and
said member stations in the first and second cells contending for access to said medium following said global channel release instant. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification