Research Paper (postgraduate), 2012
Abstract —Mobile Ad-hoc network popularly known as MANETs, consists of mobile nodes without any fixed infra-structure, where each node actively participates in routing a multi-rate network employs nodes with different data rates, radio range and bandwidth. A heterogeneous MANET has various kinds of mobile nodes. Thus to deliver message from source to destination or to have per-to-peer communication it not only requires a route establishment but also to ensure minimum delay.
we attempt to analyze various delays involving in packet transmission with mathematical formulation and conditions subjected to certain assumption .This mathematical modeling proves to be sufficient to answer the QoS demands like finding the path with minimum delay among the available paths from source to destination, taking into consideration the route parameters like geographic distance and data rate. Another application is the packetizing (or) packet/cell framing to utilize other paths whose data rates may be degraded, this increase the utility and efficiency of overall network. Minimum delay routing protocol (MDRP) can also be used to determine the routes having same delay though they may differ in terms of geographical distances and data rates. Such approach will efficient in multimedia transmission over parallel links with minimum delay jitters. Various critical situations have been solved using proposed techniques as examples to validate the protocol.
Keywords-multi-rate MANETS, Bandwidth, processing-delay, queuing-delay, transmission-delay, propogation delay, gerogarpic-distance, data-rate, mutimedia QoS conditions.
A mobile Ad-hoc network  consists of mobile nodes, making the network topology to change rapidly and randomly. Routing between nodes that are not directly within each other’s transmission range is performed by the intermediate mobile nodes which are connected by wireless links with maximum coverage up to 2000 meters [2,3],since MANETs have no centralized administrative support. Examples of such networks are note-book computers, personal data assistances (PDAs) in a conference, rescue operations, disaster management etc., where a speedy communication is desired. The specific characters of MANETs include mobility of nodes, bandwidth availability and battery operated intermediate nodes. Moreover, the 802.11 a/b/g/e standards have data rates ranging from 1 to 54 Mbps. However to use these multi-rate capabilities, the routing protocol must be aware of such network information .The present routing algorithms can be broadly classified into two categories, Position based routing protocols and Topology based routing protocols .The position based routing protocols are efficient in the sense that they have a lower route discovery overhead as compared to proactive and reactive topology based protocol, which floods the network. The route from source to destination is established by utilizing location Service of the GPS modems attached to each node which helps the node to be aware of its position and position of neighboring nodes. In greedy forwarding based protocol a route from source to destination is assigned in terms of shortest geographical distance between source and destination without conforming the compatibility of assigned route for message size which is to be sent from source to destination.
Our proposed technique focuses on Position based geometric routing, where the source nodes knows the position of the destination node. To establish a route with minimum delay, we will calculate End-to-end delay with its mathematical formulation. The analysis of such formulation will be used to assign routes for an efficient multimedia transmission via parallel links and efficient framing of the data to utilize the available paths effectively reducing the power consumption.
The rest of the paper is organized as follows. Section 2, gives an overview of related work. Section 3 presents our proposed approach. In Section 4, we deal with some topologies to validate our approach. Conclusion is presented in Section 5.
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