OPTIMIZED ROUTING IN ZHLS USING CORE ZONE EXTRACTION

Abstract: An ad-hoc network is the cooperative engagement of a collection of mobile nodes without the required intervention of any centralized access point. Most conventional protocols exhibit their least desirable behaviour for highly dynamic interconnection topology. In this paper, in order to reduce communication overhead such as flooding in mobile adhoc network, we present a routing scheme for zone based hierarchical link state routing protocol with core zone extraction(ZHLS-CZE).In distributed adhoc routing protocol.ZHLS is a hybrid routing protocol for mobile adhoc network in which a network is divided into non- overlapping zones. All network nodes in ZHLS construct two routing tables, an intra zone routing table and an inter zone routing table, by flooding node LSPs within the zone and zone LSPs throughout the network. However, this incurs a large communication overhead in the network. In our proposed scheme, we first select the core nodes in each zone and then core zones for the entire network. A packet can be send from source to destination by using selective core zones only and thus reducing communication overhead significantly.Furthermore,in ZHLS-CZE,only the core zone store zone LSPs and construct inter zone routing tables therefore the total storage capacity required in the network is less than in ZHLS