An optimal speed control scheme supported by media servers for low-power multimedia applications
An optimal speed control scheme supported by media servers for low-power multimedia applications
复制标题
低功耗多媒体应用媒体服务器支持的最佳速度控制方案
DOI：
10.1007/s00530-009-0153-5
复制
发表时间：
2009
影响因子：
3.9
通讯作者：
Ye Wang
中科院分区：
文献类型：
--
作者：
Wendong Huang;Ye Wang
在本文中，我们提出了一个新的概念，动态电压缩放（DVS）的低功耗多媒体解码在电池供电的移动的设备。大多数现有的DVS技术在实现能量效率的同时提供有保证的回放服务质量是次优的，这主要是由于仅客户端方法的固有限制。为了解决这个问题，在本文中，我们调查的可能性，媒体服务器支持的DVS技术与平滑机制。朝着这个新的方向，我们提出了一个通用的离线比特流分析框架和一个最佳的速度控制算法，实现了最大的能量节省所有可行的速度配置文件中给定的缓冲区。该方案使我们能够计算缓冲区大小的可行性条件，这是一个给定的媒体剪辑的缓冲区大小要求的理论下限。更重要的是，我们的计划从四个方面促进实际应用。首先，它不需要关于客户端配置的反馈信息。这使得我们的计划特别适合于广播或组播应用。第二，基于缓冲区大小的可行性条件的速度曲线可以提供令人满意的能量效率。第三，所需的缓冲区大小非常小，大多数移动的设备都可以满足。第四，附加的边信息（即，速度分布）与媒体内容的大小相比是可以忽略的。这些特性解决了媒体服务器支持的DVS方案的多样性问题和可行性问题。实验结果表明，与现有的代表性技术相比，我们的方案提高了DVS的性能显着。
In this paper, we present a new concept of dynamic voltage scaling (DVS) for low-power multimedia decoding in battery-powered mobile devices. Most existing DVS techniques are suboptimal in achieving energy efficiency while providing the guaranteed playback quality of service, which is mainly due to the inherent limitations of client-only approaches. To address this problem, in this paper, we investigate the possibility of media server supported DVS techniques with smoothing mechanisms. Towards this new direction, we propose a generic offline bitstream analysis framework and an optimal speed control algorithm which achieves the maximal energy savings among all feasible speed profiles for the given buffers. The proposed scheme enables us to compute the buffer sizes of feasibility condition, which are the theoretical lower bound of buffer size requirement for a given media clip. More importantly, our scheme facilitates practical applications from four aspects. First, it does not require feedback information on clients’ configuration. This renders our scheme particularly suitable for broadcast or multicast applications. Second, the speed profile based on buffer sizes of feasibility condition can provide satisfactory energy efficiency. Third, the required buffer sizes are so small that they can be met by most mobile devices. Fourth, additional side information (i.e., speed profile) of the proposed scheme is negligible compared to the size of media content. These properties solve the diversity issue and feasibility issue of media server supported DVS schemes. Experimental results show that, in comparison with the representative existing techniques, our scheme improves the performance of DVS significantly.