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Foreseen as an effective transparent interconnection of heterogeneous, wired and wireless, networks with critical requirements on bandwidth, 4G telecommunication infrastructures are a challenge for the design of transmission optimization. In this paper, the IST FP6 PHOENIX project system, which was shown allowing an optimized allocation of resources for multimedia transmission over wired/wireless links is presented, and its architectural choices are analyzed, with a particular focus on the signalling used for joint source channel coding, and the optimization modules called joint controllers. The analysis and optimization of the achieved performance is done with respect to four critical issues: cost of the control/signalling overhead, reaction time of joint controller placed at application level, effect of loss or delay of feedback information and impact of crossing multiple wireless hops.
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