In this paper , we mainly focus on the support capability and qos technology of streaming traffic on ( e ) gprs radio access network , such as qos parameters and control architecture followed both new and old gprs technology specification 本论文主要研究( e ) gprs无线接入网络中流式数据业务的传输支持及其qos技术,包括新旧规范下的qos指标和管理控制。
Today the main commercial implementation of voip is the version of " pstn - ip - pstn " : users still call everyone by their traditional phone , while the actual change lies in internal backbone of the network 当前voip商用的主要模式是“ pstn ip pstn ” ，即由电信运营商在内部使用internet网络承载话音数据，用户通过普通电话经传统的pstn接入网络使用voip服务。
The integrating heterogeneous wireless technologies based on wireless access and software defined radio may be the efficient solution to provide seamless radio connectivity to different radio access networks within a small physical distance 无线接入技术与软件无线电技术( softwaredefinedradio ， sdr )的融合被认为是实现不同无线接入网络整合通信的有效解决方案之一。
Thus , it is very important how to ensure the subscribers " benefits and permit them enjoy the network resource , how to prohibit no license users access the network , how to maintain subscribers " communication during handoff 而如何保证只有签约用户才能接入网络享受网络资源，如何保障合法用户移动过程中通信的连续性，是本课题的一个关键技术，也是本文的核心任务。
Furthermore , the defect of the currently used single key mechanism in access network is discovered in this thesis . the advantages and feasibility of public - key authentication are demonstrated , based on which an authentication solution for mobile communication is brought forward 另外，分析了目前移动通信系统采用单钥体制进行接入网络认证的缺点，采用公钥密码进行认证的优势和可行性。
As a contrast , the loops linking customer terminals with the central offices are mostly traditional cupreous twisted - pairs , on which a data stream can only be transferred at a rate of no more than 64kb / s using an analog modem 随着光纤技术的迅速普及，尤其是密集波分复用技术的大力采用，我国骨干传输网的带宽瓶颈问题已经基本得到解决。然而，在用户终端到电信端局的接入网络上，绝大多数接入介质还是传统的铜双绞线。
With the rapid development of information all over the world , hfc network becomes one of the preferable kinds of broadband access network because of its broad band , rich frequency resource , convenient access measure and low rebuild expenses 随着世界范围内信息高速公路建设的迅速发展， hfc网络作为一种宽带接入网络，越来越显示出其特有的优势：极宽的传输频带、丰富的频率资源、方便的接入手段和相对较低的技术改造费用。
Simulation results show that abf - csma / ca protocol can realize space - division - multiple - access ( sdma ) and provide very high channel utilization . chapter 3 considers employing smart antennas in the central access point ( cap ) of wireless internet access networks 第三章研究了智能天线在internet无线接入网络中的应用，主要考虑使用智能天线对抗同信道干扰与多径衰落，增加覆盖范围，并在mac层实现智能天线与网络的有机结合。
