Abstract
With the increasing development of Mobile Ad Hoc Network usage, there will be more need to have a transport protocol with an appropriate throughput in end to end transport. Because of the design nature of TCP protocol for wired Networks, its application in Mobile Ad-hoc Networks causes a reduction in efficiency, performance and throughput.Protocols such as SCTP with sufficient validity and reliability in data transfer are proposed as solution for increasing throughput. However, in order to provide the above quality, sacrifice factors such as Network balance. In the present paper, two optimized transporting algorithm are introduced. These algorithm act based on retransmission timeout control and selective acknowledgement number for transmissions in SCTP protocol. The offered algorithms using implemented NS-2 simulator and throughput improvement and reduction of packet delay time are compared with former protocols.
Highlights
Considering an increase in Ad-hoc Networks usage, applications such as file transmission and web reviewer, are used in mobile Ad-hoc Networks under TCP Protocol broadly
In other words, when several simultaneous connections are used, there is a capability for transmitting some objects with a high speed through other simultaneous connections which is called head-of-line Blocking (HOL) method
Transmission by several simultaneous connections would cause a higher transmission speed, it could be followed by balance decrease and network delay time increase
Summary
Considering an increase in Ad-hoc Networks usage, applications such as file transmission and web reviewer, are used in mobile Ad-hoc Networks under TCP Protocol broadly Since this protocol is designed more for wired networks, and it is not appropriate for wireless networks such as Ad-hoc Networks, there are some problems like not following balance for transmission of several data streams and a through put reduction of flows. Transmission by several simultaneous connections would cause a higher transmission speed, it could be followed by balance decrease and network delay time increase Another basic problem is route failure in Ad-hoc networks appeared by nodes movement causing TCP congestion control mechanism stimulation and as a result sever reduction of performance and excessive increase in TCP flow delay. The offered algorithm includes two parts: fix RTO and dynamic sack whose implementation is done by the help of NS-2 simulator and throughput parameters and packet loss delay are proposed in the from of standard diagrams, and are compared in the from of standard diagrams, and are compared with previous methods and the results are set forth
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