Research And Implementation Of ODMRP Routing Protocol Based On Energy Drain Rate In Moblie Ad Hoc Networks

Mobile ad-hoc networks (MANET) are wireless networks consisting of a collection of untethered nodes with no fixed infrastructure. Nodes in a MANET participate in forwarding data packets when the two end-points are not directly within their radio range. The MANETs present characteristics such as dynamic topologies, bandwidth-constrained, variable-capacity links, and energy-constrained operations that will affect protocol design. A critical issue for MANETs of untethered nodes is that nodes are normally power constrained. Developing routing protocols for MANETs has been an extensive research area during the past few years and many proactive and reactive routing protocols have been proposed.On the basis of investigating the multicast routing protocols and considering the characteristics of mobility and energy constrained of nodes in MANETs, this thesis proposes a modified routing protocol based on energy drain rate named DR-ODMRP. DR-ODMRP has three aspects of improvement. On the one hand, this issue proposes a routing mechanism based on energy drain rate and mobility prediction which takes into account the energy consumed time and link expiration time based on which DR-ODMRP presents a route selection algorithm. It can guarantee that the forwarding group nodes chose to establish path have the sufficient power and are in a low energy consumed rate with relative low speed during the route discovery phase. So the established paths are not only higher stability and also balancing the traffic load, which extend the lifetime of nodes. On the other hand, in order to compute the energy drain rate, this thesis defines a specific energy expenditure model, as a collection of linear equations for calculating the energy consumed in sending, receiving and discarding broadcast and unicast data packets of various sizes. Based on which the energy drain rate could be calculated and dynamically reflect the energy consumed condition under the current traffic load. Finally, for the purpose of repairing the route before link break, DR-ODMRP implements the dynamic refreshment of multicast group mesh during the mesh maintain phrase based on the stable connected time.This thesis gives a detailed description of DR-ODMRP routing protocol and the implementation of the DR-ODMRP on NS2network simulation platform. Then the issue carries out some simulation experiments of DR-ODMRP and ODMRP by varying the values of CBR sending rate, under high and low speed of node scenarios. Finally, this thesis analyzes the experimental result, and then compares the performance between DR-ODMRP and ODMRP on packet delivery ratio, end-to-end delay and life time of node. Then it analyzes the reasons for the differences of performance. To some extend, the evaluation indicates that the proposed protocol improves the performance of network in these three aspects compared with ODMRP. Especially under high traffic load scenario, the performance of DR-ODMRP is better.