Reduction of the broadcast redundancy by location awareness in mobile ad hoc networks

In this paper, a reachability-guaranteed approach for reducing broadcast storms in MANET is proposed. The approach is based on location awareness of each node, which means each node in the network needs to equip the positioning device like GPS and exchanges location information in the HELLO message with its neighbors. Three mechanisms are included in the proposed approach: Relay Set (RS), Neighbor Coverage (NC), and Transmission Order (TO). RS is a sender-based mechanism in which the sending node of the broadcast message determines the relay set of its neighbors for rebroadcast according to the radio coverage of the neighbors. The idea of the received-based NC is: a node receiving a broadcast message does not have to rebroadcast the message if all its neighbors have received the same message. TO mechanism requires a farther neighbor node away from the sending node to rebroadcast the message earlier than closer nodes so that a closer node may have more chances to save the rebroadcast. Simulation results have shown that the proposed approach ‘RS+NC+TO’ has a better performance than existing solutions like threshold-based schemes and angle-based scheme in terms of 100% reachability, more saved rebroadcast, and shorter average latency.     

A reliability enhanced density adaptive data dissemination scheme for VANETs

In this paper, a reliability enhanced and density adaptive data disseminating scheme is proposed for Vehicular Ad hoc NETworks (VANETs). The distributed on demand inquiring and re-sponding mechanism is employed to get nodes’ connectivity information. The announcing-listening process is also designed to find the nodes with bigger additional degree to rebroadcast, by which the relaying node is selected freely from density’s influence. Simultaneously, a reliability parameter is de-signed to choose redundant relays for each hop. According to the importance of the broadcast, the parameter is set by the source node properly. Simulation results show that the scheme has achieved good performances such as low forwarding ratio, short latency and low load. The broadcast coverage ratio is ensured against the influence of key link errors and relaying nodes failure by paying suitable additional communication.     

基于移动通讯网络的流媒体播放系统设计方案

流媒体主要是指在网络系统中,使用流动式的传输方式和传输技术连续的进行播放的一种及时性媒体,也就是在互联网系统中,以数据流的形式对信息进行实时的发布和播放视频多媒体信息。在这里所说的流媒体技术就是将连续的影像和声音经过必要的压缩和处理之后,将其放在网络的服务器上,保证能够在视频和资讯的浏览者一般收看信心资讯一边实现在线下载,而不再需要等到多个媒体文件下载完成之后不就可以即时的进行观看的一种技术。在流媒体发展过程中,移动流媒体技术就是把流媒体技术和移动通信设网络技术相互结合,让移动用户能够通过移动终端浏览多媒体信息的一种新技术。本文主要对移动流媒体的系统设设计方案进行了必要的分析和研究,并就该系统中的各项功能进行了详细的分析和研究,针对移动流媒体的特性就本系统采用的编码标准进行了详细的分析,希望通过本次研究对更好的促进=移动通信网络流媒体播放系统的设计有一定的帮助。     

无线传感器网络中带消息恢复机制的PBC广播认证协议

为了在无线传感器网络(WSN)中保证安全等级的情况下最小化通信和计算成本,提出了一种带消息恢复机制的基于配对密码学的广播认证协议。该机制不需要同时传输原始签名信息和新生成的签名信息,认证/消息恢复过程能自动恢复原始签名信息。首先初始化系统,基站产生系统参数;然后用户从基站获取密钥,访问WSN;最后当用户需要广播消息给WSN时,用户使用包含消息恢复机制的身份签名(IBS)协议写下签名消息,生成签名后进行消息广播。实验性能分析表明,与IMBAS和IDBAS相比,本文协议的广播消息大小分别减少了30%和22.3%,在112比特位安全等级,总能耗至少减少30%左右,在80比特位安全等级至少可降低15%的总能耗。     

基于流媒体技术的企业在线监控系统设计方案

流媒体技术是一种在互联网络上以流的方式传输多媒体信息的技术.随着宽带网络的发展和用户对网络多媒体技术需求的不断扩大,流媒体技术以及相关的应用得到越来越多的关注,被认为是未来高速宽带网络的主流应用技术之一.介绍了流媒体技术的概念和原理,并提供了一种利用流媒体技术和相关设备面向企业实现在企业内部网和远程在线监控的设计方案.     

4K超高清播出系统信息安全等级保护方案设计

为确保广东广播电视台4K超高清播出系统的安全性,按照国家广电总局信息系统安全等保的要求,需要设计一套完整的安全解决方案,防止外界非法操作对业务系统进行试探和攻击。广东广播电视台4K超高清电视安全以播出需求为基础,为适应全媒体时代下的电视节目的生产、播出,需要全面整合广东广播电视台的现有超高清、高清、标清系统资源,重构电视播出业务生产流程,对系统进行安全加固,满足当前电视播出信息系统安全等级保护的要求。     

新型自台广播质量保证系统在广播发射台的应用

对播出节目人工开路收测是各广播发射台常用的收测方式,收测效果受不确定因素影响较大,无法实时保证广播电台的安全播出工作,本文介绍了一种新型自台广播质量保证系统,设计理念先进,功能强大,能够完全满足广播电台信息化发展的需要。     

广播电视网络发展和运营研究

从介绍我国广播电视网络发展现状入手 ,分析了广播电视网络的基本运营特点 ,总结了广播电视网络的发展规律 ,指出了现阶段广播电视网络运营中存在的问题 ,并针对问题提出了具体的解决方案——建立运营服务平台、转变广播电视网络业务模式、利用业务和技术手段整合广播电视网络等 .最后对我国广播电视网络未来的发展作出了展望