Title: ENCAPSULATION OF REAL TIME COMMUNICATIONS OVER RESTRICTIVE ACCESS NETWORKS

Issue Number: Vol. 6, No. 3
Year of Publication: Jul - 2016
Page Numbers: 173-183
Authors: Rolando Herrero
Journal Name: International Journal of Digital Information and Wireless Communications (IJDIWC)
- Hong Kong
DOI:  http://dx.doi.org/10.17781/P002071

Abstract:


The mechanisms of firewall traversal used to overcome the problems that impact Real Time Communications (RTC) in restrictive access networks introduce, among other impediments, excessive latency that results in degraded media quality when frames are dropped by playout buffers running at the application layer. In this paper we summarize the main mechanisms that are used to traverse firewalls through a comparative analysis that concludes with an extensive overview of media encapsulation technologies. One drawback of tunneling, however, is that it involves stream based transport, that is incompatible with datagram based media. Under this scenario and to evaluate how both, speech and video, are ultimately affected by latency and loss typical of mobile networks we use state-of-the-art quality metrics. Moreover, in order to mitigate these negative effects in the context of tunneled traffic, we introduce and assess two separate methods that are optionally applied on top of regular stream based encapsulation.