Abstract
Integrating MANETs (Mobile Ad-hoc Networks) nodes to the Internet require either a connection to the Internet or they can connect to the Internet through the Internet gateways. For the second case if a node in a MANET has discover the gateway to connect to the fixed hosts in the Internet and it can be done either by broadcasting a gateway discovery request message initiated by nodes itself or by broadcasting periodic gateway advertisement messages from the gateways. End to end packet delay and throughput are strongly dependent on the time needed to discover the gateways.Nodes in a MANET use number of hops as metric to select a path to a gateway, if all the nodes select its nearest gateway to access the Internet then there may be situations when the network performance degrades because some nodes along the path have too many packets waiting in the queue.This paper presents a novel solution to access internet through mobile nodes in ad hoc network. Here the gateway replies with an advertisement message which is broadcasted to the whole network instead of sending a unicast reply to the requesting node. The traffic load taken into account along a path in addition with minimum hop count to select an efficient gateway. The AODV routing protocol has been used for routing in the MANET domain.A new strategy of gateway discovery was investigated and impact of new metric on the gateway selection in NS-2 was observed. Simulation results show that the proposed scheme outperforms over the existing scheme with high throughput and lower end to end delay.
Highlights
TO MANET AND INTERNETMANET-Internet integration [1] is a heterogeneous network which interconnects wired Internet to the wireless (MANET)
In order to extend the benefit of a MANET, it is interconnected to the Internet which lets mobile devices within the MANET to communicate with wired nodes in the Internet and to access services provided by the Internet
This interconnectivity results in a heterogeneous wiredcum-wireless network which has been referred in the literature by various terms like infrastructure based MANET or Internet Integrated MANET (IIM) [1]
Summary
MANET-Internet integration [1] is a heterogeneous network which interconnects wired Internet to the wireless (MANET). In order to extend the benefit of a MANET, it is interconnected to the Internet which lets mobile devices within the MANET to communicate with wired nodes in the Internet and to access services provided by the Internet This interconnectivity results in a heterogeneous wiredcum-wireless network which has been referred in the literature by various terms like infrastructure based MANET or Internet Integrated MANET (IIM) [1]. Some of the important issues in this interconnection includes: seamless routing of packets from one type of network to the other, location management of mobile nodes, single point of failure regarding gateways, gateway load balancing, addressing, and efficient discovery of gateways by mobile nodes in the MANET. None of the authors have addressed these two issues together These two issues are closely related since gateway load balancing entails adjusting the gateway discovery parameters.
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