Role of Link expiration time to make reliable link between the nodes in MANETs: A Review

摘要

Link Expiration is a main problem in already existing secure and non-secure routing protocols of mobile adhoc network (MANETs) and one of the most encouraging issues of research areas. Due to non reliable link, number of packet loss and other routing overhead increased. So, the requirement is both: reliable link and security. Secure communication in mobile adhoc networks is difficult because of mobility, availability of limited resource, changing topology of nodes and limited processing power. MANETs are highly prone to attacks namely, passive attacks and active attacks. Traditional routing protocols do not provide security. So, we need to concentrate on reliability and expiration time of links (LET).Link disconnection is another problem in mobile ad hoc network. Due to mobility of nodes link expires and the node has to find another route for sending the data. So, that route must be discovered from which the link does not expire before all the packets reach the destination. In this paper we have discussed the different types of routing protocols in MANET's and their performance evaluation based on different parameters using Qualnet simulator.