MobiCom poster: video transport over ad-hoc networks with path diversity
MobiCom poster: video transport over ad-hoc networks with path diversity
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MobiCom 海报：通过具有路径多样性的自组织网络进行视频传输
DOI：
10.1145/881978.881996
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
S. Panwar
中科院分区：
文献类型：
--
作者：
S. Mao;Yao Wang;Shunan Lin;S. Panwar
ad-hoc网络是一个移动的节点的集合，这些节点将“在运行中”创建网络。ad-hoc网络和传统蜂窝技术之间的主要区别是ad-hoc网络内缺乏集中式管理以及独立于预先存在的基础设施。因此，在ad-hoc网络中，除了在衰落周期期间具有相当高的传输误码率之外，网络拓扑可能频繁且不可预测地改变，这使得通过ad-hoc网络的视频传输比通过传统无线网络更具挑战性。另一方面，由于ad-hoc网络中的所有节点可以以任意方式动态连接，因此通常可以在源和目的地之间建立多条路径，给定其网状拓扑。许多自组织路由协议（例如，DSR [1]）本质上提供源节点和目的地节点之间的多条路径。视频编码和传输方案可以利用多条路径的可用性来对抗传输错误。文献[2][3]提出了在多媒体数据传输中利用路径分集的思想，主要考虑图像传输。最近，已经提出了几种差错恢复视频编码和传输控制技术，用于使用路径分集的视频传输，特别是在ad-hoc网络环境中。在[4]中，提出了一种用于多路径视频传输的基于反馈的参考图片选择（RPS）方案。通过根据路径状况的预测状态和正确解码的图像选择参考图像（这又取决于反馈消息），该方案可以在编码效率方面以适度的代价实现高的差错恢复。在[5]中提出了与选择性ARQ传输方案（LC+ARQ）相结合的分层编码，其中基础层和增强层分组在不同路径上传输，并且仅允许基础层分组被重传。
An ad-hoc network is a collection of mobile nodes that will create the network "on the fly". The main differences between ad-hoc networks and conventional cellular technology are the lack of a centralized administration within ad-hoc networks and the independence from pre-existing infrastructure. Consequently, in an ad-hoc network, besides having quite high transmission bit error rates during fading periods, the network topology may change frequently and unpredictably, which makes video transmission over ad-hoc networks more challenging than over conventional wireless networks. On the other hand, since all nodes in an ad-hoc network can be connected dynamically in an arbitrary manner, it is usually possible to establish more than one path between a source and a destination, given their mesh topology. Many ad-hoc routing protocols (e.g., DSR [1]) essentially provide multiple paths between the source node and the destination node. A video coding and transmission scheme could take advantage of the availability of multiple paths for combating transmission errors. The idea of utilizing path diversity in multimedia data transmission was proposed in [2][3], which mainly considered image transmission. Recently, several error resilient video coding and transport control techniques have been proposed for video transmission using path diversity, especially in an ad-hoc network environment. In [4], a feedback-based reference picture selection (RPS) scheme for video transmission over multiple paths was proposed. By selecting reference pictures according to the predicted status of the paths' condition and the correctly decoded pictures, which in turn depends on the feedback message, the scheme can achieve high error resilience at moderate cost in coding efficiency. Layered coding combined with a selective ARQ transport scheme (LC+ARQ) was proposed in [5], in which base and enhancement layer packets are transmitted over different paths and only a base layer packet is allowed to be retransmit-