doi: 10.1685/journal.caim.359

Optimized joint bandwidth and playout control for streaming-traffic over wireless-channels

Nicola Cordeschi, Tatiana Patriarca, Enzo Baccarelli


Media-streaming applications over time-varying faded wireless channels present mul- tiple still open challenges, mainly arising from the energy-limited nature of the wireless connections, as well as the delay and delay-jitter sensitive features of the conveyed media traffic. In this paper, we recast the challenges to be tackled in the form of a suitable non- linear constrained optimization problem involving finite-capacity G/G/1 queues at both transmit and receive nodes of the considered connection. Afterwards, we develop an opti- mized scheduling policy that seeks to improve media-streaming performance by building up adaptive joint control of the media source rate (e.g., the connection bandwidth), chan- nel rate (e.g., transmit rate) and delivery rate (e.g., playout rate). Formally speaking, the objective that we consider is the maximization of the average transmit rate, when con- straints on the: i) allowed average and peak energies; ii) maximum connection bandwidth (e.g., maximum source rate); and: iii) buffer’ capacities are simultaneously present. Fur- thermore, to properly cope with the jitter-sensitive feature of media-streaming, we also require that the joint controller to be developed is able to guarantee jitter values below any desired target limit. The joint controller we derive as solution of the described opti- mization problem works in an adaptive (e.g., time-varying) and Cross-Layer (CL) way, and requires synergic cooperation of the Application (APP), Data Link (DL) and Phys- ical (PHY) layers of the underlying protocol stack. The presented numerical results give insight about the attained optimized tradeoff among transmit rate, delay and delay-jitter.

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Communications in Applied and Industrial Mathematics
ISSN: 2038-0909