Energy Efficient ERS for Multicast Routing in MANET

Expanding Ring Search (ERS) is one of the widely used concept to reduce broadcast overhead in wireless networks like mobile ad-hoc network and sensor network. ERS start its successively searching process with TTL= TTL_START and end if TTL>= TTL_THRESHOLD reaches. Based on the TTL_INCREMENT value, ERS process starts by searching successively larger areas in the network keeping the source as centered of broadcast. When TTL cross the value of TTL_THRESHOLD, network-wide broadcast is initiated. To take advantage of ERS, in this paper, we propose an optimized routing algorithm named Energy Efficient ERS (E2-ERS) which executes an efficient route discovery scheme by reducing the total number of transmissions of RREQ during route discovery process for multicast in MANET. It also compares the proposed Energy Efficient ERS with original ERS technique used by Multicast Ad-hoc On demand Distance Vector Protocol (MAODV) using various parameters like End to End Delay, Goodput and Packet Delivery Fraction for varying node speed and varied TTL_Increment values for varied number of receivers.