Maximizing channel utilization in mobile Adhoc networks using an adaptive distributed broadcast scheduling, power adaption and rate control

Abstract

A mobile ad hoc network (MANET) is a group of autonomous mobile wireless nodes without a fixed infrastructure. New members can join and leave the network at any time. Due to this mobility nature of the Mobile Adhoc networks, the nodes state information changes frequently and finding a channel schedule for the nodes in the network becomes difficult. The channel bandwidth and battery lifetime are the two resources to be optimized to improve the performance of the Mobile Adhoc Networks and it is important to study the effect of different transmission power levels on the performance of the mobile adhoc networks. Hence we proposed methods for 1. Finding an efficient schedule which is adaptive to the changes in the topology. 2. Maximizing the throughput. 3. Maximizing the network capacity. 4. Avoiding collisions. 5. Minimizing the information to be exchanged between the nodes. The performance of a mobile adhoc networks depends on the parameters like frame sizes, slot duration, channel capacity, channel utilization (i.e., the fraction of channel capacity used for generating good throughput), and the number of concurrent transmissions, transmission range, distance between the nodes, density, SINR, and data rates allowed for transmission in the network. In an Infrastructure based Networks, the central node is called as a base station. This central node carries out all these decisions. However, in a mobile adhoc network, no such base station is maintained. The Medium Access Control newline(MAC) protocol contains a set of rules to decide how a collection of nodes can share the common medium. It plays a vital role in achieving reliable data transmission, maximum channel utilization, and fair access to the medium. In TDMA protocol the time is divided into reservation period and transmission period. During the reservation period the nodes reserves their slot and during the transmission period they transmit in the order of the reservation.