FB-ODMRP: A Feedback-based Scheme for Improving ODMRP Performance in Ad Hoc Networks

Shima Mohseni,Rosilah Hassan,Alireza Shams Shafigh

doi:10.19026/rjaset.7.422

Abstract

This research aims at proposing an improvement to On Demand Multicast Routing Protocol (ODMRP) called as Feedback ODMRP (FB-ODMRP). ODMRP is a popular multicast routing protocol designed for ad hoc networks with mobile hosts. Its efficiency, simplicity and robustness to mobility render it one of the most widely used routing protocols in MANETs. In ODMRP, the robustness is achieved using periodic route refreshing wherein group membership and multicast mesh are established and updated by the source on fixed refresh intervals and thus such route refresh interval is of the utmost importance to ODMRP's performance. However, robustness comes at the expense of high control overhead incurred to the network. If small route refresh interval values are used, fresh routes and membership information can be achieved at the expense of incurring more control packets and increasing probability of packet collisions and congestion whereas the large refresh values are used, the protocol cannot keep up with network varying dynamics resulting route breakages and packet failure. In this research, the proposed variation of ODMRP makes the route refresh interval variable adapted to feedback information achieved from receivers of the multicast group. Through extensive simulations, it is observed that FB-ODMRP performs well over the range of scenarios and incurs less control overhead compared to original ODMRP while maintaining packet delivery ratio comparable that of the original ODMRP.

Highlights

Motivated by increasing usage of laptop computers and communication over wireless devices, wireless communication between mobile users becoming increasingly on-demand
Probability of increasing or decreasing the interval: In FB-On Demand Multicast Routing Protocol (ODMRP), we propose to assign an array of probabilities in order to take appropriate actions under different feedback information
The simulation code and scenario of this research was implemented within GloMoSim library (Bajaj et al, 1999) FB-ODMRP is the enhanced scheme to the original ODMRP as proposed in this research

Summary

Introduction

Motivated by increasing usage of laptop computers and communication over wireless devices, wireless communication between mobile users becoming increasingly on-demand. Among multicast protocols proposed for ad hoc networks, ODMRP (Lee et al, 2002) has verified to outperform other protocols under different network scenarios (Jetcheva and Johnson, 2004). ODMRP is relied on network wide flooding of control packets in fixed periodic refresh intervals to refresh and rebuild the mesh structure. Such periodic control messages intend to provide robustness to ODMRP despite mobility and unreliable wireless links. E-ODMRP proposed by Oh et al (2005) is one of the ODMRP’s variations focusing on variable refresh interval rather than the fix ones

Objectives

Methods

Results

Conclusion