Abstract
Mobile Ad hoc Network (MANET) is a wireless network consisting of mobile devices (laptops, smart phones, etc.) that move and communicate with each other without the use of any existing network infrastructure or centralized server to avoid collisions which have negative effects on the performance of the network. Access to the shared media is controlled by a Backoff algorithm that is a part of the Media Access Protocol. In this paper, we improve the History Based Probabilistic Backoff (HPPB) algorithm by modifying the increment/decrement behavior of the Contention Window to introduce History Based Increment Backoff (HBIB) algorithm which outperforms HBPB in terms of throughput and end-to-end delay with various numbers of nodes and different traffic loads.
Highlights
A Mobile Ad hoc Network (MANET) is a wireless network in which nodes communicate without a central base station [1]
We introduce a modification on a History Based Probabilistic Backoff algorithm (HBPB) algorithm by using absolute value of (β) in the CW computation; β here represents order of collision and successful transmission in the network
In order to evaluate the performance of the suggested backoff algorithms the Network Simulator (NS) version 2.35 have been used with different MANET scenarios, created by Carnegie Mellon University (CMU)’s [18] traffic-pattern generator script cbrgen.tcl which is used to create a Constant Bit Rate (CBR) traffic connection between wireless mobile nodes to allow very tight control over the bandwidth in use at any moment, and CMU’s node-movement generator script “setdest”, which used Random Waypoint algorithm to create node movements pattern for mobile nodes
Summary
A Mobile Ad hoc Network (MANET) is a wireless network in which nodes communicate without a central base station [1]. Nodes in MANET can be routers, senders and receivers. These nodes have different abilities and uses, they have to find other nodes inside the transmission range to form a network because there are no control dedicated units to manage this connection, and this pattern decreases the cost and the complexity of the MANET [1]. MANET can be used in many useful applications that vary from military communication and commercial environments, to education and home networking [2]
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