Semi-random back-off method for achieving resource reservation in wireless local area networks

1. A method, said method comprising:

determining if a successful unicast transmission has occurred;

if a successful unicast transmission has occurred, adjusting a contention window to a minimum value and adjusting a time slot back-off counter to one-half of the value of said contention window plus one;

adjusting a service ring size responsive to said time slot back-off counter; and

adjusting said contention window using one of a plurality of adjustment schemes and selecting said time slot back-off counter from an interval between zero and said contention window.

2. The method according to claim 1 wherein said adjustment schemes include binary exponential back-off, multiplicative increase linear decrease, exponential increase exponential decrease and linear increase linear decrease.

3. The method according to claim 1 further comprising:

determining if there is more data to transmit; and

transmitting said data responsive to said determination.

4. An apparatus comprising:

means for determining if a successful unicast transmission has occurred;

means for adjusting a contention window to a minimum value and adjusting a time slot back-off counter to one-half of the value of said contention window plus one if a successful unicast transmission has occurred;

means for adjusting a service ring size responsive to said time slot back-off counter; and

means for adjusting said contention window using one of a plurality of adjustment schemes and selecting said time slot back-off counter from an interval between zero and said contention window.

5. The apparatus according to claim 4 , wherein said apparatus is one of a mobile device, a server and a base station.

6. The apparatus according to claim 4 , further comprising:

means for determining if there is more data to transmit; and

means for transmitting said data responsive to said determination.