Despite concerted efforts for relaying crucial situational information, disaster relief volunteers experience significant communication challenges owing to failures of critical infrastructure and longstanding power outages in affected areas. Researchers have proposed the use smartphones, working delay tolerant (DTN) mode, setting up a peer-to-peer network enabling post communication. However, due opportunistic contacts, intermittent connectivity constrained resources (mainly battery) mobile...

In this paper, we propose SAGE-PRoPHET, a security enhanced PRoPHET routing protocol that enables secure dissemination of post disaster situational messages using history group encounters. Post rescue and relief operations are essentially based, where volunteers workers, belonging to different groups, relay information relevant their respective camps, in multiple hops on peer-to-peer basis. Now, it is evidently better route information, destined for camp particular group, through or who has...

Throughput maximization problem is considered in this paper.Here, throughput analysis done for fixed allocation of channels.Fixed channels means number primary users allocated to a channel be but the different channels.Primary specific compete access and cognitive sense whether free or not.The transmission probabilities secondary are different.In paper we consider delay related users.We very large.Our objective find optimal maximize total users.

The Opportunistic Network Environment (ONE) simulator is a Java based intended for research in Delay Tolerant Networks (DTNs). Apart from allowing users to simulate different DTN scenarios rapidly and versatile manner, it also offers an easy way generate results the simulations performed. Although ONE widely accepted among community as standard simulator, supports only some limited features of DTN. current release (version 1.6.0) dissemination messages with textual content over unicast mode...

In this paper, throughput analysis is presented for random allocation of channels in a cognitive radio network. allocation, each primary user dynamically and randomly selects channel time slot. Secondary users are able to detect the idle slot compete access these channels. We develop model secondary users. A Poisson probability law utilized computation. The parameters such as traffic generation probability, fraction computed quantification throughput. Some specified number light maximum

Natural disasters take its toll on traditional communication infrastructure severely causing intermittent network connectivity due to partially or fully damaged infrastructure. Therefore, data dissemination is hampered and the volunteers different disaster management agencies find it difficult communicate among them. Fortunately, a sizeable population (around 35%-45%) these days owns various wireless devices like smart phones, tablets etc. with multiple interfaces (Bluetooth, Wi-Fi Direct)....

Opportunistic or Delay-tolerant networks (DTNs) may be used as a viable option for exchanging situational information during post-disaster communication in the absence of existing infrastructure. As opposed to traditional networks, dissemination DTNs depends on degree intermittent connectivity among mobile nodes. Higher implies smaller delay disseminate which results better knowledge sharing. The is influenced by mobility pattern nodes heterogeneous nature. In this work, we attempt formulate...

Delay-tolerant network (DTN) has been employed as a viable option for exchanging situational information during post-disaster communication. In contrast to stable network, reliability in DTN depends on the contact opportunities among nodes (both mobile and static). Higher degree of opportunity implies improved message delivery with reduced latency, which results enhanced reliability. order improve deployment static relay (Throwboxes) widely adopted. deploy Throwboxes effectively, prior...

In this paper we discuss throughput analysis for fixed allocation of channels in a cognitive radio network. number primary users allocated to channel is all the time. But different channels. The secondary or sense whether free not. sometimes when access then arrive and collision occurs. transmission probabilities are different. packet delay considered paper. Our objective find optimal maximize total users.

This research proposal investigates the promise of Opportunistic or Delay-tolerant networks (DTNs) for efficient and effective information dissemination in context natural disasters. Natural disasters affect traditional communication infrastructure thereby call different unconventional techniques to meet requirements. is because may get incapacitated due severity disaster lack power supply. Fortunately, majority population these days owns various wireless devices, such as smart phones...