Method to Reduce the Overflow of Rtcp Packets While Transmitting Multimedia Components over Internet
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Abstract
This paper presents the design and performance analysis of Real-time Transport Control Protocol. RTP, the Real Time Transport Protocol, has been used as the transport protocol for voice and video on the Internet. Its companion control protocol, is the Real Time Control Protocol (RTCP). Together theseprotocols provide controlled delivery of multimedia traffic over the Internet. RTCP is used for loose session control, QoS reporting, and media synchronization, delay, jitter and packet loss calculations. The RTP specification describes an algorithm for determining the RTCP packet transmission rate at a host participating in a multicast RTP session. This algorithm was designed to allow RTP to be used in sessions with anywhere from one to a million members. However, we have discovered several problems with this algorithm when used with very large groups with rapidly changing group membership. One problem is the flood of RTCP packets which occurs when many users join a multicast RTP session at nearly the same time. To solve this problem, this paper proposed a novel adaptive timer algorithm called timer revaluation algorithm. This paper demonstrate that it performs extremely well, reducing the congestion problem by several orders of magnitude.
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Keywords: RTCP, QoS, RTP, NTP, SR, RR
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