Throughput Analysis of IEEE 802.11 DCF with Modified Binary Exponential Backoff in Mobile Ad Hoc Networks

Throughput Analysis of IEEE 802.11 DCF with Modified Binary Exponential Backoff in Mobile Ad Hoc Networks

Rishipal Singh (Jawaharlal Nehru University, India) and D. K. Lobiyal (Jawaharlal Nehru University, India)
DOI: 10.4018/jmcmc.2010070105
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Abstract

In the design of wireless networks, the medium access protocols have a very large impact on the performance of the network. The IEEE 802.11 is widely accepted technology for the Wireless LANs and is used by wireless networks. This paper presents an analysis of the performance of Distributed Coordination Function (DCF) for IEEE 802.11 under modified Binary Exponential Backoff (BEB) Algorithm using Frequency Hoping Spread Spectrum (FHSS). In the modified algorithm, the size of Contention Window (CW) has been changed with the factor of for the first four collisions and the size becomes double thereafter in each subsequent collision. This paper also covers the effects of various parameters in modified BEB Algorithm.
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Ii. Distributed Coordination Function

The basic service set (BSS) is the primary building block of IEEE 802.11 WLANs. The area covered by BSS is called basic service area (BSA), just like a cell in cellular network. IEEE 802.11 supports both the ad hoc network and infrastructure network architecture.

The DCF mode is a random access scheme and it is based on the carrier sense multiple access with collision avoidance (CSMA/CA) protocol. DCF consists two ways of transmission, among them one is basic access method and another method which is optional is called RTS/CTS method. The working of each method of medium access is explained below.

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