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American Journal of Engineering and Applied Sciences
Year: 2009  |  Volume: 2  |  Issue: 4  |  Page No.: 620 - 627

Error Resistant Real-Time Transport Control Protocol

S. Shahbazi, K. Jumari and M. Ismail    

Abstract: Problem statement: Real-time Transport Control Protocol (RTCP) protocol has been thesubject of various criticisms due its problematic performance in large-scale networks. S-RTCP is aprotocol with high potential as it has proved to be able to solve many problems of RTCP. It hasnumerous flaws on its own. This study aimed at dealing with flaws of S-RTCP and improving it interms of stability and packet loss.
Approach: A new proposed scheme was designed. Modificationsincluded designing multi-manager scheme, improving parent-seeking procedures, reducing distributionof request packets, reforming the design to be independent from TTL, adding methods to check on sanityof manager nodes. This study considered packet loss ratio of below 2% as desirable.
Results: ER-RTCPcomparing to legacy RTCP in terms of packet loss using NS-2 in four different scenarios revealedimprovements between 73 and 88% for various scenarios. It also kept packet loss rate below 2% for allscenarios. Comparison of ER-RTCP to S-RTCP showed that based on different α (stability of eachsingle manager) values, ER-RTCP was more stable as it showed more resistance to entire schemebreakdown (β). ER-RTCP's parent-seeking procedure, as modeled scenario revealed a packetgeneration reduction of 97%, compared to S-RTCP’s. In occurrence of parent AG leave or loss, ERRTCPreduced request packet generation by 95%. Allowance of AG dismissing in ER-RTCP, avoidedoccurrence of packet loss, as sample scenario showed S-RTCP experiencing packet loss of 3.5% whileER-RTCP kept packet loss at zero in theory.
Conclusion: Proposed design improved S-RTCP in termsof reduction of packet loss and stability.

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