AIFSNArmy Integrated Family Support Network
AIFSNArbitration Inter-Frame Space Number
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(2) If the channel idle time is greater than AIFSN, (3) Compute [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (4) Compute [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (5) Update [W.sub.i].
Parameter Value Slot time 16 SIFS 32 AIFSN 2 EIFS 188 Guard interval 4 ms CCH interval 50ms MAC header 256 bit PHY header 192 bit
In this case, whenever the medium is sensed busy after an AIFSN period, the counter previously mentioned is decreased by one time slot.
In [5] a set of scenarios is presented in which several values for the AIFSN and CW are taken into account.
In order to optimize the performance of EDCA, it has been demonstrated that the AIFSN and the CW parameters are the most relevant factors [4-6].
One of the most serious difficulties in EDCA is precisely the huge amount of collisions that take place between voice and video transmissions, which are usually caused because they use the same AIFSN value and a very short length for the [CW.sub.min] and [CW.sub.max] parameters.
From the point of view of the AIFSN combination, the increase of the values must be performed on the video AC given that voice transmissions have stricter time constraints.
STEP 8: once the corresponding decision to the rule is taken, the FLS defuzzifies the decision to the corresponding Arbitration Inter Frame Space Number (AIFSN) values, using the matrix D detailed in Table 3.
The fuzzy inference rules have been chosen in Table 2 such that the FLS uses the best configuration of the four AIFSN according to the two inputs REL and CR, in order to minimize the collision probability.
The {S1, S2, S3 and S4} CR values have been chosen by studying the impact of different AIFSN values on collision rate for different densities and traffic load.
Cooklev, "Introducing Finer Prioritization in EDCA using Random AIFSN," The 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities, Lake Buena Vista FL, pp.
Default EDCA MAC parameters values TXOPLIMIT (ms) Extended DS-CCK Rate/OFDM Other AC AIFSN CWmin CWmax (11b) (.11a/g) PHYs VO 2 (aCWmin +1) (aCWmin +1) 3.264 1.504 0 4-1 2-1 VI 2 (aCWmin +1) aCWmin 6.016 3.008 0 2-1 BE 3 aCWmin aCWmax 0 0 0 BK 7 aCWmin aCWmax 0 0 0 Table 2.