arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1110.0147cs.NIcs.MM
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无线网络多媒体通信的跨层协议

Cross-Layer Protocols for Multimedia Communications over Wireless Networks

Jaydip Sen

摘要:

在过去的几年里,互联网的吞吐量,使用率和可靠性几乎呈指数级增长。宽带无线移动自组织网络(MANDON)和蜂窝网络的引入以及增加的计算能力已经为待创建的新种类的应用(即,实时多媒体应用)打开了大门。在复杂的网络(如Internet)上传输实时多媒体流量是一项特别具有挑战性的任务,因为这些应用对带宽、延迟和延迟抖动有严格的服务质量(QoS)要求。传统的基于IP的尽力而为服务已经不能满足这些严格的要求。无线信道的时变性质和资源受限的无线设备使得该问题更加困难。为了提高终端用户在无线互联网上感知的媒体质量,QoS支持可以在不同的层中解决,包括应用层、传输层和链路层。跨层设计是实现这种适应的一种众所周知的方法。在跨层设计中,考虑到来自物理无线介质的挑战和来自应用的QoS需求,使得在物理(PHY)层的速率、功率和编码可以适应于满足给定当前信道和网络条件的应用的要求。文献中存在许多跨层设计的提议。在本章中,我们对这些结合了应用层、传输层和链路层控制的跨层体系结构进行了广泛的回顾。特别是,像信道估计技术,自适应控制在应用层和链路层的能源效率,基于优先级的调度,传输层的传输速率控制,自适应自动重传请求(ARQ)的问题进行了详细讨论。

英文摘要:

In the last few years, the Internet throughput, usage and reliability have increased almost exponentially. The introduction of broadband wireless mobile ad hoc networks (MANETs) and cellular networks together with increased computational power have opened the door for a new breed of applications to be created, namely real-time multimedia applications. Delivering real-time multimedia traffic over a complex network like the Internet is a particularly challenging task since these applications have strict quality-of-service (QoS) requirements on bandwidth, delay, and delay jitter. Traditional Internet protocol (IP)-based best effort service is not able to meet these stringent requirements. The time-varying nature of wireless channels and resource constrained wireless devices make the problem even more difficult. To improve perceived media quality by end users over wireless Internet, QoS supports can be addressed in different layers, including application layer, transport layer and link layer. Cross layer design is a well-known approach to achieve this adaptation. In cross-layer design, the challenges from the physical wireless medium and the QoS-demands from the applications are taken into account so that the rate, power, and coding at the physical (PHY) layer can adapted to meet the requirements of the applications given the current channel and network conditions. A number of propositions for cross-layer designs exist in the literature. In this chapter, an extensive review has been made on these cross-layer architectures that combine the application-layer, transport layer and the link layer controls. Particularly, the issues like channel estimation techniques, adaptive controls at the application and link layers for energy efficiency, priority based scheduling, transmission rate control at the transport layer, and adaptive automatic repeat request (ARQ) are discussed in detail.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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