无线-光纤宽带接入网对多媒体通信网络的影响及关键技术分析.docx

重庆邮电大学研究生堂下考试答卷2013-2014学年第2学期考试科目多媒体通信技术姓名年级2013级专业信息与通信工程 2014 年6月10日无线-光纤宽带接入网对多媒体通信网络的影响及关键技术分析（重庆邮电大学，重庆 400065）摘要：近年来，随着多媒体业务的增长，通信网络对接入网的要求越来越来高。无线-光纤宽带接入网络（WOBAN）作为一种混合型的接入方案，能够发挥光纤接入和无线接入技术的优势为用户提供更为理想的网络服务，但同时仍有一些需要解决的技术难题。本文介绍了一种用于无线-光纤宽带接入网络（WOBAN）下视频服务的无线保护切换方案，该方案引进了用于多服务应用程序的无线功能的ONU（称为WONU），并使用无线资源来保护网络免受光纤故障。在最后一段光纤链路被切断时，无线保护方案会建立跨ONU通信的两个WONU之间的无线链路保护来恢复服务。且在WOBAN测试平台上的实验结果表明，该方案能有效地使用无线资源保护的视频服务。关键词：多媒体通信网；视频服务；无线-光纤宽带接入网（WOBAN）；服务质量（QoS）；光网络单元（ONU）The impact of Wireless-OpticalBroadband Access Networkon multimedia and key technology analysisXIAO Yong-xing, Student ID:S130101193(Multimedia Communications Research Laboratory,The Chongqing University of Posts and Telecommunications, Chongqing 400065)Abstract:In recent years, with the growth of multimedia services, the requirements of the access network become increasingly high. Wireless - Optical broadband access network (WOBAN), as a hybrid access network, can take advantage of optical access and wireless access technology to provide users with more ideal network service. However, there are still some technical problems that have to be solved. The paper proposes a wireless protection switching scheme for video service in Optical-Wireless Broadband Access Network, which introduces the ONU with wireless function (called WONU) for multiple service applications, and uses the wireless resource to protect the network from fiber failure.It establishes the wireless protect link between two WONU for the inter-ONU communication to restore the service when the last-drop fiber is cut. The results of the experiment ona WOBAN test-bed indicate that this scheme could effectively protect the video service by using the wireless resource.Key Words: multimedia communication network； video service； Wireless-OpticalBroadband Access Network (WOBAN)；Quality of Service (QoS)；Optical Network Unit (ONU)0.引言在最近几年，多媒体数据服务的全球需求以惊人的速度增长。由于多媒体分发服务的进步，多媒体数据服务需求在未来将以更快的步伐增长，网络容量和网络覆盖必须跟上需求。由于骨干网一般采用光纤结构，传输速度快，因此，接入网便成为了整个多