A Cross-Layer Approach for an Efficient Delivery of TCP/RTP-Based Multimedia Applications in Heterogeneous Wireless Networks
A Cross-Layer Approach for an Efficient Delivery of TCP/RTP-Based Multimedia Applications in Heterogeneous Wireless Networks
复制标题
DOI：
10.1109/tvt.2008.918727
复制
发表时间：
2008-02
影响因子：
6.8
通讯作者：
T. Taleb;K. Kashibuchi;A. Leonardi;S. Palazzo;K. Hashimoto;N. Kato;Y. Nemoto
中科院分区：
文献类型：
--
作者：
T. Taleb;K. Kashibuchi;A. Leonardi;S. Palazzo;K. Hashimoto;N. Kato;Y. Nemoto
电信业最近的趋势是发展无处不在的信息系统，在这种系统中，无论时间和空间的限制，提供过多的高级多媒体服务都是可能的。在各种类型的无线网络上高效和无缝地提供多媒体服务仍然是一项具有挑战性的任务。潜在的困难在于每种网络类型上的带宽可用性差异。事实上，对异类无线网络中的切换现象的基本挑战包括有效地探测新网络的带宽可用性，随后迅速调整数据递送速率。本文提出了一种跨层的方法，包括物理层、数据链路层、应用层、网络层和传输层。前三个层用于预测切换发生并定位到网络的新附着点。根据它们的反馈，然后使用传输层来使用低优先级的伪包来探测新网络的资源。作为目前应用最广泛的多媒体传输协议，本文介绍了基于传输控制协议和实时传输协议的多媒体应用。讨论了整个跨层体系结构的设计，并对两种协议进行了改进。通过大量的仿真，对改进的TCP和RTP的性能进行了评估，并与现有的方案进行了比较。研究结果对多媒体业务在异质无线网络中的传输具有良好的参考价值和应用前景。
Recent trends in the telecommunication industry have been moving toward the development of ubiquitous information systems, where the provision of a plethora of advanced multimedia services should be possible, regardless of time and space limitations. An efficient and seamless delivery of multimedia services over various types of wireless networks is still a challenging task. The underlying difficulty consists of the disparity in the bandwidth availability over each network type. Indeed, the fundamental challenge upon a handoff phenomenon in a heterogeneous wireless network consists of an efficient probing of the bandwidth availability of the new network, followed by a prompt adjustment of the data delivery rate. This paper presents a cross-layer approach that involves five layers, namely, physical, data link, application, network, and transport layers. The three former layers are used to anticipate the handoff occurrence and to locate the new point of attachment to the network. Based on their feedback, the transport layer is used then to probe the resources of the new network using low-priority dummy packets. Being the most widely used protocol for multimedia delivery, this paper addresses multimedia applications based on the Transmission Control Protocol (TCP) and the Real-time Transport Protocol (RTP). The design of the whole cross-layer architecture is discussed, and enhancements to the two protocols are proposed. The performance of the enhanced TCP and the RTP are evaluated and compared against existing schemes through extensive simulations. The obtained results are encouraging and promising for the delivery of multimedia services in heterogeneous wireless networks.