Håvard Espeland
Håkon Kvale Stensland
Pål Halvorsen
ABSTRACT
The transport of streaming media data over TCP is hindered by TCP's probing behavior that results in the rapid reduction and slow recovery of the packet rates. On the other side, UDP has been criticized for being unfair against TCP connections, and it is therefore often blocked out in the access networks. In this paper, we try to benefit from a combined approach using a proxy that transparently performs transport protocol translation. We translate HTTP requests by the client transparently into RTSP requests, and translate the corresponding RTP/UDP/AVP stream into the corresponding HTTP response. This enables the server to use UDP on the server side and TCP on the client side. This is beneficial for the server side that scales to a higher load when it doesn't have to deal with TCP. On the client side, streaming over TCP has the advantage that connections can be established from the client side, and data streams are passed through firewalls. Preliminary tests demonstrate that our protocol translation delivers a smoother stream compared to HTTP-streaming where the TCP bandwidth oscillates heavily.
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Cross Ref
- Handley, M., Floyd, S., Padhye, J., and Widmer, J. TCP Friendly Rate Control (TFRC): Protocol Specification. RFC 3448 (Proposed Standard), Jan. 2003. Google ScholarDigital Library
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Index Terms
- Transparent protocol translation for streaming
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