Enhancing the Selection of Backoff Interval Using Fuzzy Logic over Wireless Ad Hoc Networks

Algorithm 1

Steps to be followed while transmitting and receiving RTS.

TransmitRTS:

(i) If the medium is Free for DIFS period then

                        (a) If the backoff counter is in freeze state then do continue with old backoff counter

                        (b) else if node is in training Phase then

                                                (i) Generate Backoff counter randomly between (0, CW)

                        (c) else if node is not in training phase then

                                                (i) Apply local data, input from NT to Fuzzy logic algorithm and find out backoff

                                                       between (0, CW).

(ii) Decrement backoff counter by one for every idle slot.

(iii) If the back off counter reaches zero,

                        (a) Store current queue length and waiting time of this node

                        (b) Start transmission.

(iv) else if the channel is busy, the backoff counter is paused until the next DIFS free period.

ReceiveRTS:

(i) Receive RTS and increment RTS count by one.

(ii) If RTS count is greater than 15 then training phase is set to false

(iii) If the packet is destined to current node

                        (a) update neighbor table and process the packet.

(iv) If the packet is not destined to current node.

                        (a) update the neighbor table and NAV (Network Allocation Vector) timer.

                        (b) drop the packet.