Wireless Communication

Samina Mansuri ¹, Hemal Shah ², Yogeshwar Kosta ³

Affiliations
1 Ganpat University, Kherva, Mehsana, Gujarat, IN
2 U. V. Patel College of Engineering, Ganpat University, Kherva, Mehsana, Gujarat, IN
3 Marwadi Education Foundation, Rajkot, Gujarat, IN

Abstract

Delay Tolerant Networks are the networks providing communication services where end to end delay is very long and connectivity is intermittent. In order to achieve data delivery in such challenging networking environments, researchers have proposed the use of store-carry-and-forward mechanism based protocols: there, a node may store a message in its buffer and carry it along for periods of time, until an appropriate contact opportunity arises. Additionally, multiple message replicas are often propagated to increase delivery probability. This combination of long-term storage and replication creates a high storage overhead on mobile nodes. In real world scenarios nodes are having finite buffer storage capacity. Thus, efficient buffer management policies i.e. drop and scheduling are necessary. This paper presents basic aspects of Buffer Management in terms of DTN and narrates the various policies, algorithms, advantages and disadvantages. Finally brief table is presented showing comparative studies of all existing drop and scheduling policies.

Keywords

Buffer Management, DTN, Drop Policies, Scheduling Policies.

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Samina Mansuri ¹, Hemal Shah ², Yogeshwar Kosta ³

Affiliations
1 Ganpat University, Mehsana, IN
2 U. V. Patel College of Engineering, Ganpat University, Mehsana, IN
3 Marwadi Education Foundation, Rajkot, IN

Abstract

Delay Tolerant Networks enable communication in challenged environments where resources like buffer, bandwidth power are limited. Due to the limitation of buffer storage a proper buffer management policy is required which includes the proper drop and scheduling policy. In this paper the buffer management architecture for Delay Tolerant Networks is proposed which segregates the incoming traffic into different queues. This includes policy based admission control, message segregation into queues and scheduling. In scenario of over flow, message gets drop based on different drop policy. Also, forwarding of message upon next contact opportunity is carried with round robin scheduler to ensure fairness. It is planned to implement the proposed work using ONE simulator and do performance analysis.

Keywords

Buffer Management Architecture, DTN, Drop Policy, Scheduling Policy.

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Hemal Shah ¹, Yogeshwar P. Kosta ², Nisha Patel ¹

Affiliations
1 Ganpat University, Gujarat, IN
2 Marwadi Education Foundation, Rajkot, IN

Abstract

In this paper is a precipitate of various applications/projects concerning delay tolerant networks. Our study summarizes each of the applications independently, aspects consisting of purpose, network type, environment, and network setup and data collection methodology. This study is primarily done to discover common parameters that will help in generalization, pin down niches which need to be addressed in the context to attempt unification amongst different project application and also propose best technique for specialized application. Further, this paper will serve as quick reference base to summarize the details.

Keywords

Adhoc Network, DTN, Routing, Wireless Networks.

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Hemal Shah ¹, Yogeshwar P. Kosta ²

Affiliations
1 Ganpat University, Gujarat, IN
2 Marwadi Education Foundation, Rajkot, IN

Abstract

A communications network that withstands long delays or outages and is capable of storing packets temporarily stationed in intermediate nodes, until an end-to-end route is re-established or regenerated is known as a delay tolerant network or in short DTN. This paper aims to consolidate general & basic aspects relating to information needs to efficiently execute DTN routing. We start by presenting the evolution of some routing protocols, spotting few routing schemes relevant to us, discuss their groups and classifications, their operating network environment, and through critical study and observation, to identify specific parameters that are common across relevant schemes associated with routing that helps to bring out the advantage and disadvantage associated with them in an attempt to establishing some possible future extensions-of-the-existing through consolidation - accomplished by capturing, organizing and showcasing the same in metrics and proposing new schemes as well. This leads us to identify specific schemes and techniques that will help us to exploit the delay and utilize the time judiciously to improve the over all efficiency of information exchange in a DTN network. The essence of this study being; to utilize efficiently the temporal period (delay) by opportunistically establishing connectivity - in a strategic manner, to help exchange information across by locally distributed resources, thus making optimal use of available network resources and enhancing the efficiency of information exchange.

Keywords

Forwarding, Replication, Single-Copy, Multiple-Copy, Relay, Delivery Ratio, Delay, Throughput, Local Resource, Routing Techniques, Routing Efficiencies, Protocol Introduction.

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