A Bandwidth Variation Pattern-Differentiated Rate Adaptation for HTTP Adaptive Streaming Over an LTE Cellular Network
A Bandwidth Variation Pattern-Differentiated Rate Adaptation for HTTP Adaptive Streaming Over an LTE Cellular Network
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LTE 蜂窝网络上 HTTP 自适应流的带宽变化模式-差分速率自适应
DOI：
10.1109/access.2017.2788057
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Xiang Gao
中科院分区：
文献类型：
--
作者：
Haipeng Du;Qinghua Zheng;Weizhan Zhang;Xiang Gao
目前，HTTP自适应流（HAS）是用于移动的视频流的最先进技术。HAS的速率适配已经被设计为在两个对比要求之间进行权衡，即，通过在视频回放会话期间在不同的视频比特率之间自适应地切换来增强视频的质量并降低视频冻结的概率。当移动到长期演进（LTE）蜂窝网络时，由于无线信道的不稳定性质，该过程变得更具挑战性。在本文中，我们提出了LTE蜂窝网络的带宽变化模式区分速率自适应（BVPDRA）算法。与以往的工作，BVPDRA不罢工之间的稳定性和响应性的比特率切换的带宽容量变化的情况下的平衡。BVPDRA将LTE蜂窝网络的带宽变化模式区分为恒定带宽波动或瞬时带宽跳变。因此，BVPDRA以双重特性操作：对于恒定带宽波动，BVPDRA执行平滑带宽预测和保守速率切换以最小化视频质量版本振荡;对于瞬时带宽跳变，BVPDRA执行正带宽预测和积极速率切换以最大化带宽利用率并最小化回放停顿的风险。我们经验评估的性能BVPDRA的LTE蜂窝网络测试平台。结果表明，BVPDRA实现了更高的平均比特率，和更低的再缓冲率与降低的比特率切换频率。
Currently, HTTP adaptive streaming (HAS) is the state-of-the-art technology for mobile video streaming. The rate adaptation of HAS has been designed to make a trade-off between two contrasting requirements, i.e., enhancing the quality of a video, and reducing the probability of video freezes, by adaptively switching between different video bitrates during a video playback session. This process becomes more challenging when moving onto an long term evolution (LTE) cellular network due to the unstable nature of the wireless channel. In this paper, we propose the bandwidth variation pattern-differentiated rate adaptation (BVPDRA) algorithm for LTE cellular networks. Unlike prior works, BVPDRA does not strike a balance between the stableness and responsiveness of bitrate switching in the case of bandwidth capacity variations. BVPDRA differentiates between bandwidth variation patterns of the LTE cellular network as either constant bandwidth fluctuations or instantaneous bandwidth hopping. Accordingly, BVPDRA operates with a dual character: for the constant bandwidth fluctuations, BVPDRA performs smoothed bandwidth prediction and conservative rate switching to minimize video quality version oscillations; for the instantaneous bandwidth hopping, BVPDRA performs positive bandwidth prediction and aggressive rate switching to maximize the bandwidth utilization and minimize the risk of playback stalling. We empirically evaluate the performance of BVPDRA on an LTE cellular network testbed. The results demonstrate that BVPDRA achieves a higher average bitrate, and lower rebuffering ratio with a reduced bitrate switching frequency.
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