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In favor of an enhanced network interface for multimedia services



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In favor of an enhanced network interface for multimedia services Department of Electrical Engineering and Computer Sciences University of California Paul Haskell Compression Labs Inc David G Messerschmitt University of California at Berkeley Berkeley California 94720 ABSTRACT The future will see networks that are increasingly heterogeneous in transport media such as wireless public telephone network Internet and broadband ATM terminals from desktop supercomputers to personal digital assistants with limited wireless bandwidth applications and network services including continuous media CM datatypes in addition to data Aside from seamlessly supporting this heterogeneity goals for a well thought out network architecture should include high traffic capacity especially on wireless links for example through joint source channel coding high subjective quality including low delay privacy by end to end encryption and enhanced connectivity including multicast and mobility Past attempts at defining an internetworking protocol suite for CM services have concentrated on resource reservation for delay guarantees This paper summarizes a number of other issues relating to CM services with particular emphasis on wireless access links pointing out that the highest subjective quality and traffic capacity cannot be obtained by simply adding wireless access to existing broadband networks and compression standards The simplistic approach of transcoding conversion from one compression standard to another has a number of undesirable characteristics among them a network infrastructure relatively closed to change and inconsistent with privacy We describe a framework based on decomposing CM video audio graphics animation into substreams at the network interface as proposed in standards like IPv6 and ST II in the Internet as well as at internetworking interfaces and propose other characteristics of this interface We point to new opportunities tailored to CM services like annihilation of stale



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