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Probabilistic Forwarding of Coded Packets on Networks

Kumar, BRV and Kashyap, N (2021) Probabilistic Forwarding of Coded Packets on Networks. In: IEEE/ACM Transactions on Networking, 29 (1). pp. 234-247.

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Official URL: https://dx.doi.org/10.1109/TNET.2020.3031467

Abstract

We consider a scenario of broadcasting information over a network of nodes connected by noiseless communication links. A source node in the network has some data packets to broadcast. It encodes these data packets into n coded packets in such a way that any node in the network that receives any k out of the n coded packets will be able to retrieve all the original data packets. The source transmits the n coded packets to its one-hop neighbours. Every other node in the network follows a probabilistic forwarding protocol, in which it forwards a previously unreceived packet to all its neighbours with a certain probability p. We say that the information from the source undergoes a 'near-broadcast' if the expected fraction of nodes that receive at least k of the n coded packets is close to 1. The forwarding probability p is chosen so as to minimize the expected total number of transmissions needed for a near-broadcast. We study how, for a given k , this minimum forwarding probability and the associated expected total number of packet transmissions varies with n. We specifically analyze the probabilistic forwarding of coded packets on two network topologies: binary trees and square grids. For trees, our analysis shows that for fixed k , the expected total number of transmissions increases with n. On the other hand, on grids, a judicious choice of n significantly reduces the expected total number of transmissions needed for a near-broadcast. Behaviour similar to that of the grid is also observed in other well-connected network topologies such as random geometric graphs and random regular graphs. © 1993-2012 IEEE.

Item Type: Journal Article
Publication: IEEE/ACM Transactions on Networking
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Binary trees; Network coding; Packet networks; Probability; Topology, Connected networks; Forwarding probabilities; Network topology; Number of transmissions; Packet transmissions; Probabilistic forwarding; Random geometric graphs; Random regular graph, Broadcasting
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 11 Mar 2021 09:32
Last Modified: 11 Mar 2021 09:32
URI: http://eprints.iisc.ac.in/id/eprint/68197

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