On-Demand Multicast Routing Protocol in Multihop Wireless Mobile Networks

An ad hoc network is a dynamically reconfigurable wireless network with no fixed infrastructure or central administration. Each host is mobile and must act as a router. Routing and multicasting protocols in ad hoc networks are faced with the challenge of delivering data to destinations through multihop routes in the presence of node movements and topology changes. This paper presents the On-Demand Multicast Routing Protocol (ODMRP) for wireless mobile ad hoc networks. ODMRP is a mesh-based, rather than a conventional tree-based, multicast scheme and uses a forwarding group concept; only a subset of nodes forwards the multicast packets via scoped flooding. It applies on-demand procedures to dynamically build routes and maintain multicast group membership. ODMRP is well suited for ad hoc wireless networks with mobile hosts where bandwidth is limited, topology changes frequently, and power is constrained. We evaluate ODMRP performance with other multicast protocols proposed for ad hoc networks via extensive and detailed simulation.     

WiMAX系统中QoS机制研究

文章分析了WiMAX系统QoS机制的主要内容:业务流管理、QoS保证算法,探讨了QoS机制对主动授权、实时查询、非实时查询和尽力而为等数据业务的支持.为了让不同业务的QoS得到保证,文章重点探讨了基于信道状态的分组调度算法(CSDPS)、基于业务类型排队(CBQ)的CSDPS调度算法和通用处理器共享策略,并给出了相应的算法模型.     

VC Management for Heterogeneous QoS Multicast Transmissions

A crucial component of the interaction between ATM's and the Internet's Quality of Service (QoS) architectures is the efficient mapping of RSVP (Resource reSerVation Protocol) as the Internet's signalling protocol onto the according ATM mechanisms. In particular, this article focuses on one of the most contrary characteristics of RSVP and ATM signalling. This is the support for heterogeneous reservations by RSVP over the ATM subnetwork, taking into account that ATM only allows for a homogeneous QoS within a single Virtual Circuit (VC). We present previous approaches to the solution of this problem and argue for more sophisticated and efficient approaches to manage ATM VCs taking into consideration ATM tariffs and resource consumption.     

GSM系统的业务量控制

通信网中的业务量控制是维持正常操作所必不可少的技术 ,本文介绍了当今使用较多的GSM数字移动通信系统在业务量控制上所采取的一些基本方法。     

ASON中的GMPLS协议简介

对通用多协议标记交换（GMPLS）协议的三个组成部分（路由协议、信令协议和链路管理协议）的功能分别作了简要介绍.     

CDMA2000系统中的广播和多播业务

在下一代移动通信系统中,CDMA2000有着广泛应用,其广播业务和多播业务又是整个系统的一个亮点。文章详细讨论了CDMA2000移动系统中的广播和多播业务的设计方式,重点讨论了设计中的网络、信令等方面内容,采用这种设计方式可实现不同内容点到多点的高效、可扩展的传送。指出了设计中可能遇到的问题,提出了相应解决方案。     

基于计算机电话集成技术的校园管理信息系统研究

介绍目前一种新型的校园管理系统，它是将计算机电话集成（CTI）技术应用于计算机校园管理系统之中，使系统的信息检索和查询范围得到极大的扩展。文章介绍了整个系统的设计思想和实现方法。     

不对称数字用户线上的多播视频传送

集中讨论了基于不对称数字用户线上多播视频业务的特性、体系结构及开发多播业务的几种关键技术，对目前用于传送的几种接入体系结构进行了分析比较。     

一种支持分级服务和最小带宽保证的改进TCP算法

本文提出了一种支持分级服务和最小带宽保证的改进TCP算法－DSAS－TCP，通过对TCP算中慢启动阈值和最小拥塞窗口的分级设置来使不同等级连接的平均吞吐量产生分级，并保证用户的最小带宽需求。通过理论分析和仿真实验验证了该算法的有效性。     

Energy-Efficient Broadcast and Multicast Trees in Wireless Networks

The wireless networking environment presents formidable challenges to the study of broadcasting and multicasting problems. In this paper we focus on the problem of multicast tree construction, and we introduce and evaluate algorithms for tree construction in infrastructureless, all-wireless applications. The performance metric used to evaluate broadcast and multicast trees is energy-efficiency. We develop the Broadcast Incremental Power (BIP) algorithm, and adapt it to multicast operation by introducing the Multicast Incremental Power (MIP) algorithm. These algorithms exploit the broadcast nature of the wireless communication environment, and address the need for energy-efficient operation. We demonstrate that our algorithms provide better performance than algorithms that have been developed for the link-based, wired environment.