Enhancement the Performance of EDRP by Adaptive Hello Messaging Scheme for Neighbor Discovery in Wireless Ad-hoc Network

In mobile ad hoc networks (MANETs), the network topology changes frequently and unpredictably due to the arbitrary mobility of nodes. This feature leads to frequent path failures and route reconstructions, which causes an increase in the routing control overhead. Effective routing protocol needed to developed or modifying existing one. Protocols can be divided into topologyand position-based protocols but the protocol have physical position knowledge effective than others to overcome the unpredictably due to the arbitrary mobility of nodes. An estimated distance (EstD)-based routing protocol (EDRP) may become the best choice between position-based protocols; because position-based protocols used GPS to found the node location but EDRP not used it, this is the reason to used the EDRP. In EDRP review found that, performance of EDRP on focused on energy efficiency. This is main motivation of this paper investigation and evaluation of EDRP. In investigation found packet delivery ratio and the average end-to-end delay give some negative effect, when the node distribution is very sparse. EDRP used Hello packet when the time elapsed from the last broadcasting packet (RREQ, RERR, or some other broadcasting packets) is greater than the value of the Hello Interval does the node need to send a Hello packet. This increase the risk that a sender will transmit a packet (Hello packet) through a broken link that has not been detected by Hello messaging. It is the reason because of that of the performance metrics of routing protocol affected. To overcome that problem this paper proposed used “An Adaptive Hello Messaging Scheme for Neighbor Discovery in On-Demand MANET Routing Protocols”, that suppression of unnecessary Hello messaging. Based on the event interval of a node, the Hello interval can be enlarged without reduced detestability of a broken link, which decreases network overhead and hidden energy consumption. May also enhance the performance of other metrics of EDRP which is generating the negative effect.