Performance Evaluation of Tcp Over Multi-Path Routing Protocol Using Tcp-Door-Ts Algorithm in Mobile Ad Hoc Networks
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Date
2008-01
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Addis Ababa University
Abstract
Mobile ad hoc networking is a concept in computer communications, which means that if users want to communicate with each other, they can form a temporary network with out any pre-existing communication infrastructure. Each node participating in the networks acts as host and router in order to transmit, receive and forward packets.
In mobile ad hoc networks [MANETs], the wireless mobile nodes may dynamically enter the network as well as leave the network. Due to the dynamic nature of MANET, nodes are typically distinguished by their high degree of mobility and route failure due to frequent link breakages, which affects the end-to-end transmission of data. In order to increase the reliability of data transmission and to reduce delay due to route re-computation, some routing protocols, such as Temporally Ordered Routing Algorithm (TORA), maintain multiple routes between a sender-receiver pair, and use multi-path route to transmit packets. In such a case, packets coming from different paths may not arrive at the receiver in order. Since TCP receiver is not aware of multi-path route, it would misinterpret such out-of-order packet arrivals as a sign of network congestion. TCP performs poorly in this environment, because TCP was previously designed for reliable wired network in which all packet losses are assumed to be due to network congestion.
In this thesis by implementing TCP Detection of Out-of-Order and Response with Time Stamp (TCP-DOOR-TS) algorithm, the performance degradation of TCP has been overcome, and it is confirmed that out-of- order packet is really delivered due to multi-path routing protocol. The
simulation results have shown that, TCP-DOOR-TS algorithm has a higher throughput and good put than TCP-SACK. For two different simulation scenarios a throughput of 13 % and 7.45 % and a good put of 12.7% and 7.45 % improvements have been achieved.
Keywords: Mobile ad hoc networks, TCP-SACK, TCP-DOOR-TS, out-of-
order packet.
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Keywords
Mobile Ad Hoc Networks, Tcp-Sack, Tcp-Door-Ts, Out-of- Order Packet