The Real Time Protocol (RTP) provides a well established mechanism for media transmission that typically relies on the packetization on top of the User Datagram Protocol. One serious problem of datagram based trafﬁc, however, is that highly restrictive ﬁrewalls prevent their traversal making Real Time Communication not possible. The alternative of transporting RTP on top of the Transport Control Protocol , while reliable, it is not effective as ever-present network packet loss introduces latency that degrades media quality and negatively affects user experience. In this paper, a scheme that relies on multiplexing media frames over multiple streams is proposed. This mechanism is analyzed through a novel analytical model that links application and network packet loss in the context of wireless multiple stream transport. The model is later validated by means of an experimental framework that relying on state of the art speech codecs and quality metrics quantiﬁes its advantages. Keywords RTC TCP Multiplexing Firewall traversal Packet loss 1 Introduction network layers; an outer or external one and an inner or internal one as shown in Fig. 1. Note that the outer net- Media transmission in the context of RTC is based on RTP work layer,
Wireless Networks – Springer Journals
Published: May 28, 2018
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