OPTIMIZATION OF THROUGHPUT AND DELAY FOR DIFFERENT TYPES OF CARRIER SENSE MULTIPLE ACCESS PROTOCOLS (CSMA)

Abstract

The object of this thesis is to make a comparative study oetween different CSMNCD protocols used in LAN aiming to select 1111 optimal one.

To verify the previous task, a detail survey of the standard types

,of CSMNCD protocols, is conduced followed by suggesting a new adaptive protocol called Adaptive P-Persistent CSMNCD. The proposed APP-CSMNCD protocol was checked against the standard CSMAJCD protocols to check its effectiveness using advanced simulation technique suggested in this thesis called probabilistic algorithm.

Also presented in this thesis, comparative study between three types of backoff algorithms used for handling the retransmission procedure in the case of existence of collisions in the channel in order to selecthe optimal one. Then we recommended a mixed one and dynamic approach for these retransmission policies to be used in case offmding the channel in a collided mode.