Statistical QoS Provisionings for Wireless Unicast/Multicast of Multi-Layer Video Streams
Statistical QoS Provisionings for Wireless Unicast/Multicast of Multi-Layer Video Streams
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DOI：
10.1109/jsac.2010.100413
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发表时间：
2010-04-01
影响因子：
16.4
通讯作者：
Zhang, Xi
中科院分区：
文献类型：
--
作者：
Du, Qinghe;Zhang, Xi
由于无线信道时变，无线网络中多层视频的实时传输往往难以保证确定性的服务质量（QoS）。因此，统计QoS保证已成为支持实时视频传输的重要替代方案。在本文中，我们提出了一个有效的框架，从QoS指数、有效带宽/容量和延迟约束违反概率三个方面对无线衰落信道上多层视频传输的统计延迟QoS保证进行建模。其中，每个视频层保持单独的队列，各层设置相同的延迟边界和相应的违规概率阈值。通过对传入视频流的有效带宽/容量分析，我们得到了一组所有视频层的QoS指数，以有效地表征这种延迟QoS需求。然后，我们开发了一套最优的自适应传输方案，以最大限度地减少资源消耗，同时满足各种场景下的不同QoS要求，包括具有和/或不具有损失容忍的视频单播/多播。仿真结果也证明了统计QoS提供对我们提出的自适应传输方案的资源分配的影响。
Due to the time-varying wireless channels, deterministic quality of service (QoS) is usually difficult to guarantee for real-time multi-layer video transmissions in wireless networks. Consequently, statistical QoS guarantees have become an important alternative in supporting real-time video transmissions. In this paper, we propose an efficient framework to model the statistical delay QoS guarantees, in terms of QoS exponent, effective bandwidth/capacity, and delay-bound violation probability, for multi-layer video transmissions over wireless fading channels. In particular, a separate queue is maintained for each video layer, and the same delay bound and corresponding violation probability threshold are set up for all layers. Applying the effective bandwidth/capacity analyses on the incoming video stream, we obtain a set of QoS exponents for all video layers to effectively characterize this delay QoS requirement. We then develop a set of optimal adaptive transmission schemes to minimize the resource consumption while satisfying the diverse QoS requirements under various scenarios, including video unicast/multicast with and/or without loss tolerance. Simulation results are also presented to demonstrate the impact of statistical QoS provisionings on resource allocations of our proposed adaptive transmission schemes.