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Maximizing P2P File Access Availability in Mobile Ad Hoc Networks though Replication for Efficient File Sharing

ABSTRACT

File sharing applications in mobile ad hoc networks (MANETs) have attracted more and more attention in recent years. Theefficiency of file querying suffers from the distinctive properties of such networks including node mobility and limited communicationrange and resource. An intuitive method to alleviate this problem is to create file replicas in the network. However, despite the efforts onfile replication, no research has focused on the global optimal replica creation with minimum average querying delay. Specifically,current file replication protocols in mobile ad hoc networks have two shortcomings. First, they lack a rule to allocate limited resources todifferent files in order to minimize the average querying delay. Second, they simply consider storage as available resources for replicas, but neglect the fact that the file holders’ frequency of meeting other nodes also plays an important role in determining file availability. Actually, a node that has a higher meeting frequency with others provides higher availability to its files. This becomes even more evident in sparsely distributed MANETs, in which nodes meet disruptively. In this paper, we introduce a new concept of resource for file replication, which considers both node storage and meeting frequency.

EXISTING SYSTEM	PROPOSED SYSTEM
EXISTING CONCEPT:- Under the assumption of single-packet reception capability, much effort has been devoted to figuring out the optimal transmission probability of a node. They lack a rule to allocate limited resources to different files in order to minimize the average querying delay	PROPOSED CONCEPT: - In our proposed system we implements multipacket reception . so that  receiver will receive files  more fastly with multipacket reception This becomes even more evident in sparsely distributed MANETs, in which nodes meet disruptively
EXISTING TECHNIQUE:- PDRS PROTOCOL	PROPOSED TECHNIQUE:- PCS PROTOCOL
TECHNIQUE DEFINITION:- In PDRS, a node replicates files interested by its neighbors that have less storage resource than itself. However, as the replicas are not shared in the whole group,PDRS only renders a slight performance improvement over SAF protocol	TECHNIQUE DEFINITION:- PCS has smaller average delay than PDRS protocol. This further proves the correctness of our analysis through the trace-driven simulation.
DRAWBACKS:- Higher delay High communication cost	ADVANTAGES:- Smaller delay. Low communication cost.