Fixed deterministic post-backoff for cyclic prioritized multiple access (CPMA) contention-free sessions
First Claim
1. A method for reducing interference between overlapping first and second wireless local area network cells in a medium, each of the first and second wireless local area network cells including a respective plurality of member stations, comprising:
- coordinating by a processor of a first member station in the first wireless local area network cell a first contention-free session, the first contention-free session including multiple bursts with other member stations in the first wireless local area network cell, and retaining a control of the medium by the first member station by using interframe spaces between the multiple bursts such that the multiple bursts appear to contending stations as being a single instance of activity in the medium;
setting by the processor of the first member station a backoff timer to a fixed deterministic post-backoff delay, wherein the fixed deterministic post-backoff delay has a value of Bkoff times a fixed number of idle time slots, the value of Bkoff being greater than a number of overlapping cells; and
counting down the backoff timer by the processor of the first member station.
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Abstract
A cyclic prioritized multiple access method is disclosed which includes Fixed Deterministic Post-Backoff. Fixed deterministic post-backoff reduces conflicts between access points of overlapping cells. Contention-free sessions can be generated, one from each overlapping cell. Each active access point engages in a fixed deterministic post-backoff. A fixed deterministic backoff delay (Bkoff times a fixed number of idle time slots) is used by all access points, with the value of Bkoff being greater than the number of overlapping cells. The Bkoff should be large enough to enable the traffic that needs to be accommodated by the channel. Each access point has a backoff timer that is counted down using the shortest interframe space possible. A contention-free session is initiated when the backoff timer expires, and it is then reset to the value of Bkoff to start a new cycle.
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Citations
20 Claims
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1. A method for reducing interference between overlapping first and second wireless local area network cells in a medium, each of the first and second wireless local area network cells including a respective plurality of member stations, comprising:
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coordinating by a processor of a first member station in the first wireless local area network cell a first contention-free session, the first contention-free session including multiple bursts with other member stations in the first wireless local area network cell, and retaining a control of the medium by the first member station by using interframe spaces between the multiple bursts such that the multiple bursts appear to contending stations as being a single instance of activity in the medium; setting by the processor of the first member station a backoff timer to a fixed deterministic post-backoff delay, wherein the fixed deterministic post-backoff delay has a value of Bkoff times a fixed number of idle time slots, the value of Bkoff being greater than a number of overlapping cells; and counting down the backoff timer by the processor of the first member station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless communications system having reduced interference between overlapping first and second wireless local area network cells in a medium, each of the first and second wireless local area network cells including a respective plurality of member stations, comprising:
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a first access point station comprising a processor; and a computer-readable medium storing a plurality of instructions which, when executed by the processor, cause the processor to perform operations, the operations comprising; coordinating in the first wireless local area network cell a first contention-free session, the first contention-free session including multiple bursts with other member stations in the first wireless local area network cell, and retaining a control of the medium by the first access point station by using interframe spaces between the multiple bursts such that the multiple bursts appear to contending stations as being a single instance of activity in the medium; setting a backoff timer in the first access point station to a fixed deterministic post-backoff delay, wherein the fixed deterministic post-backoff delay has a value of Bkoff times a fixed number of idle time slots, the value of Bkoff being greater than a number of overlapping cells; and counting down the backoff timer for the fixed deterministic post-backoff delay. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer-readable medium storing a plurality of instructions which, when executed by a processor of a first member station of a first wireless local area network cell in a medium, cause the processor to perform operations for reducing interference between overlapping of the first wireless local area network cell in the medium and a second wireless local area network cell in the medium, each of the first and the second wireless local area network cells including a respective plurality of member stations, the operations comprising:
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coordinating a first contention-free session, the first contention-free session including multiple bursts with other member stations in the first wireless local area network cell, and retaining a control of the medium by the first member station by using interframe spaces between the multiple bursts such that the multiple bursts appear to contending stations as being a single instance of activity in the medium; setting a backoff timer to a fixed deterministic post-backoff delay, wherein the fixed deterministic post-backoff delay has a value of Bkoff times a fixed number of idle time slots, the value of Bkoff being greater than a number of overlapping cells; and counting down the backoff timer. - View Dependent Claims (20)
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Specification