Ad-hoc networks do not have any infrastructure or base station. Mobile ad-hoc networks have turned the dream of getting connected �anywhere and at any time� into reality. But these networks face the difficult challenge of maintaining connectivity that is affected due to several factors such as transmission power, environmental conditions, obstacles and mobility. Extension of ad-hoc networks is also a major issue that affects the performance of MANETs. Hence, it is necessary to determine the optimal Transmission range that guarantees the network connectivity while saving power and maintaining high capacity. The IETF MANET Working Group has researched and developed a number of protocols for mobile ad-hoc networks. The Zone Routing protocol (ZRP) is one of the most popular protocol which in contrast to other MANET routing protocols, utilizes a hybrid pro-active/reactive approach to maintain valid routing tables without too much overhead. In this paper, the performance of ZRP has been analyzed on the basis of QoS performance metrics by varying the transmission range and zone size while keeping the node density constant. The performance metrics comprises of Average Throughput, Packet delivery ratio (PDR), Average end-to-end delay, Routing overhead, Average jitter and Average Energy consumed. The network simulator (NS2.33) has been used to simulate the environment. From the simulation results, it has been observed that the zone routing protocol performs best with smaller zone size for all the transmission ranges but gives poor performance with the increase of zone size.

BRP, IARP, IERP, MANETs, Transmission Range, QoS, Zone radius, ZRP

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