实时业务

• Focus on the characteristics of this network , such as dynamic topology , self - organized network and service diversity , this thesis puts forward a diff - service handover algrithm based on traditional handover algrithms . in this algrithm , mobile users with realtime traffic use mobile controlled handover ( mcho ) algrithm combined with some method to avioding ping pong effect , while mobile users with non - realtime traffic imploy mobile assisted handover ( maho ) algrithm associated with some strategies to reduce network cost and guarentee route optimization . in addition , an algorithm is proposed that can realize smooth handover via creating system buffers
  针对“动中通”系统网络结构动态性、自组织性、业务多样性等特点,本论文借鉴传统的切换管理思想,结合具体业务模型,设计了区分业务的切换触发算法,即实时业务采用移动台控制( mobilecontrolledhandover ,简称mcho )的切换方式,并辅以避免乒乓切换的措施;非实时业务采用移动台辅助( mobileassistedhandover ,简称maho )的切换方式,并辅以减少系统开销和路由优化的措施。
• This article mainly discusses the basic theories and related protocol and technology of speech sound communication based on ip . the key discuss is the support of real - time services that is provided by the current ip network , codec and the acoustic - echo cancellation , as well as the dynamic monitor of network communication quality of service . it gains some conclusion by compare the merit and shortcoming between the h . 323 protocol and sip protocol and analyzing their bases : rtp / rtcp protocol
  本文主要论述基于ip的语音通信所涉及的基本理论和相关的协议与技术，重点论述当前ip数据网络对实时业务提供的支持、语音编码、回声消除和网络通信服务质量的动态监测，在协议的分析上比较h . 323和sip协议之间的优缺点，并具体分析这两个协议的基础： rtp rtcp协议。
• A novel routing protocol for ad hoc network - dsarp ( delay sensitive adaptive routing protocol ) is presented in this paper . according to dsarp , the reliable route for delay sensitive traffic can be supplied and the route can be selected based on the constrained condition - - " the shortest route and the lowest average delay " . therefore , the " hotspot " on the shortest path can be avoided
  因此dsarp是在保持最短路径的约束条件下，增加了“平西安电子科技大学博士学位论文:移动adhoc网络关键技术研究均最短时延”的约束条件，从而不仅可以为实时业务(即时延敏感的业务)提供可靠的路由，同时还能根据网络节点当前的业务流量，动态的选择最佳路径，降低了网络的平均时延，是一种新型的有qos保证的路由协议。
• We divide traffic into two kinds : real - time and non - real - time , and present a new packet scheduling algorithm . the simulation results show that this algorithm not only provide different qos ( quality of service ) guarantees for real - time traffic ( voice ) and non - real - time traffic ( data ) , but also can assign bandwidth fairly in long term
  我们提出一种符合统计时分复用( stdm )概念的分组调度算法，将业务源按实时和非实时分为两种固定优先级，在优先确保语音业务的实时性的情况下，对非实时业务源动态的分配带宽，并通过彷真表明该算法的实用性。
• Therefore , the constraint olsr routing protocol is needed . and also , the paper adds the constraint olsr to swan , a simple but available qos model . the swan has two important measures to realize the qos service , one is rate _ controller for best - effort traffic , the other is admission _ controller for real - time traffic
  在此基础上本文结合了移动adhoc网络的一种简单的qos模型? ? swan模型,采用了该模型对实时业务的接入控制机制和对尽力而为业务的速率控制机制,以实现在该网络中提供qos服务。
• The software system provides the switch with the ability to support each user monopolize lombps bandwidth , through which the user can use vod , voip and other digital services , and it also allows the switch to support multicasting , trunk , and traffic isolation . this thesis consists of five parts . the first chapter introduces ethernet access technologies and requirements for the switches
  通过软件系统的配置，接入交换机能够使用户独享10mbps带宽，使用视频点播、 voip等实时业务，支持组播以提高网络带宽的利用率，支持链路聚合，在互连交换机的多条可用的物理链路间实现自动的负载均衡。
• Simulation is operated with ns2 under linux , and the simulation results show that , the presented algorithm is simpler and more practical , while it can improve the fairness index of ad hoc network to a large extent compared with the ieee802 . 11 binary exponential backoff ( beb ) algorithm . it can make better use of the wireless channel by dynamically adjusting its backoff timer according to the network ' s contest situation . in addition , service differentiation can be achieved among flows with different qos requirements and thus the qos for medium access control in ad hoc network is improved
  通过在linux系统下利用networksimulator ( ns2 )仿真工具对算法进行计算机仿真分析,结果表明,与ieee802 . 11标准采用的二进制指数退避( beb )算法相比,该文所提算法更简单、高效,它能在很大程度上提高adhoc网络信道接入的公平性,并能动态地提供服务区分,保障对多媒体等多种实时业务的传输需求,同时,算法可以根据网络当前具体的竞争激烈情况,动态调整退避时间值,从而提高信道的利用率。
• All means of modeling and simulating in this paper are based on these theories . a new admission controlling algorithm , based on benefit equation , which we call quixote algorithm , is brought out in the second chapter . this algorithm remarkably improves the performance of network systems dealing with soft real - time admission control
  本文所提出的quixote算法，正是一种新的软实时应用的接纳允许控制和qos控制方法，在一些软实时业务的qos关键指标上，如系统的接纳允许率、 qos的稳定性和整个系统的综合利用率，比较传统算法有显著的提高。
• Beacause apon ’ s efficiency is low and epon could not provide quality assurance for real - time services , network inspection , operation management and network control , gpon was proposed by fsan in september 2002 , which can provide gigabit speed , high efficiency , transparent transmission of multi - services and specific quality of service . at present , the gpon standards , g . 984 . 1 , g . 984 . 2 , g . 984 . 3 and g . 984 . 4 , have been established by itu - t
  Fsan组织考虑到apon的低效率和epon的无法对传送实时业务提供质量保证、缺乏电信级的网络监测和业务管理等方面的不足,于2002年9月提出了具有gbit / s级的高速率、高效率,支持多业务透明传输,能够提供明确的服务质量保证和服务级别,具有电信级的网络监测和业务管理能力的光纤接入网gpon 。