家庭网关技术探讨.ppt

UTStarcom Confidential,1,家庭网关技术探讨,Product discussionUTSI-NJTC-2006xxxx v0.1,UTStarcom Confidential,2,家庭网关技术探讨,引言,家庭网关 概念历史新的延伸,UTStarcom Confidential,3,家庭网关技术探讨,中国电信项目计划,UTStarcom Confidential,4,家庭网关技术探讨,中国电信家庭产品规划,UTStarcom Confidential,5,家庭网关技术探讨,中国电信对家庭网关的看法和定义规范体系架构,中国电信家庭网关设备技术要求总体要求（V1.1暂行）中国电信家庭网关技术要求基于TriplePlay业务的家庭网关（V1.0）已经发布中国电信家庭网关设备技术要求基本型家庭网关（V1.0暂行）中国电信家庭网关设备技术要求增强型家庭网关（V1.0暂行）中国电信家庭网关设备技术要求企业型家庭网关（V1.0暂行）中国电信家庭网关设备测试要求基本型家庭网关（V1.0暂行）中国电信家庭网关设备测试要求增强型家庭网关（V1.0暂行）中国电信家庭网关设备测试要求企业型家庭网关（V1.0暂行）中国电信终端综合管理系统技术要求（暂行）已经发布家庭网关与终端综合管理系统接口技术要求（暂行）已经发布,UTStarcom Confidential,6,家庭网关技术探讨,中国电信对家庭网关的看法和定义网关形态定义,网关总体要求 是家庭网关产品总体的技术要求 通过升版满足未来技术和业务的需要 网关形态 目前根据网关的功能侧重及适用场景分三种形态 基本型 增强型 企业型总体要求与各形态网关规范的关系各形态网关规范是总体技术要求的子集各形态网关产品适用于不同场景和业务需求,UTStarcom Confidential,7,家庭网关技术探讨,中国电信对家庭网关的看法和定义网关功能点,UTStarcom Confidential,8,家庭网关技术探讨,中国电信对家庭网关的看法和定义网关形态分类,基本型网关定义在中国电信网络中使用的，ADSL2或LAN上联，具备高速上网、IPTV、家庭监控、家庭存储、信息安全等功能，支持WLAN，不支持VoIP、VPN的家庭网关设备。增强型网关定义在中国电信网络中使用的，ADSL2或LAN上联，具备高速上网、VoIP、IPTV、家庭监控、家庭存储、信息安全等功能，支持WLAN，不支持VPN的家庭网关设备。企业型网关定义在中国电信网络中使用的，ADSL2或LAN上联，具备高速上网、VoIP、视频监控、信息安全、VPN、打印共享、信息安全等功能，支持WLAN的家庭网关设备。,UTStarcom Confidential,9,家庭网关技术探讨,中国电信对家庭网关的看法和定义家庭网关定制,思路：开发三款典型的家庭网关产品（基础型和增强型）,UTStarcom Confidential,10,家庭网关技术探讨,中国电信对家庭网关的看法和定义ITMS,终端综合管理系统规定了终端综合管理系统的总体功能要求、系统构架、模块功能、系统运行流程、软硬件要求、安全要求、性能要求及与其他相关系统或平台的接口要求。终端综合管理系统是宽带业务管理平台的一个子系统，通过与BOSS及其他业务系统的交互，实现对宽带终端的集中管理和业务的统一部署。终端综合管理系统内部功能模块可分为资源管理模块、日常工作计划管理模块、网元管理模块、系统管理模块及外部服务接口模块。,UTStarcom Confidential,11,家庭网关技术探讨,中国电信对家庭网关的看法和定义ITMS内容,UTStarcom Confidential,12,家庭网关技术探讨,中国电信对家庭网关的看法和定义ITMS与网关接口,ITMS,设备认证注册模块,参数监控模块,参数配置模块,软件升级模块,测试诊断模块,HGW,代理接口模块,GM,GM1,GM2,GM3,GM4,GM5,GM6,UTStarcom Confidential,13,家庭网关技术探讨,中国电信对家庭网关的看法和定义开发计划,中国电信家庭网关定制进度计划：中国电信家庭网关综合管理系统定制计划（supportsoft）：,UTStarcom Confidential,14,家庭网关技术探讨,ADSL2/ADSL2+介绍ADSL不足,ADSL is defined by ITU-TG.992.1G.992.2Deployment problemInteroperation problem CPE compatibilityRates 8M/800KReach 3KmPower Fixed power outputStability/Performance Against noise condition and interferenceLoop condition Bridge tap/RFIManagement EOC Channel,Less Capacity,UTStarcom Confidential,15,家庭网关技术探讨,ADSL2/ADSL2+介绍ADSL2,Standard as G.992.3(ADSL.Bis)TargetImprove performanceImprove InteroperabilityHigher the data rate(128-196kbps on downstream,32-64kbps on upstream on most loops)Long reach（0.5-1kfts on most loops)DiagnosticsPower ManagementFeature overviewEnhanced and optimized modulationOLR(Online Reconfiguration)Improve Rate and ReachPower ManagementLine DiagnosticsFast Startup(O)new applications,services,and deployment scenarios.Compatible to TR-048,UTStarcom Confidential,16,家庭网关技术探讨,ADSL2/ADSL2+介绍ADSL2 ANNEX,UTStarcom Confidential,17,家庭网关技术探讨,ADSL2/ADSL2+介绍ADSL2+,Standard G.992.5(G.Bisplus)Doubles the downstream bandwidth,Extend to 2.2MhzInherits from ADSL2Meeting the high data rate requirements up to 26Mbps,UTStarcom Confidential,18,家庭网关技术探讨,ADSL2/ADSL2+介绍ADSL2+feature overview,Programmable Downstream PSD Mask(Downstream Only)、Bandplan can be programmable in both CPE and CO sideWindowing at the transmitter Up to 3 ReedSolomon codewords per symbol,to enable the higher data rates in downstream The total aggregate ADSL2plus transmit power is the same as the total aggregate ADSL/ADSL2 transmit power and shall be no more than 20.4 dBm The mask defined in G.992.5 above 1.1 MHz is spectrally compatible with the VDSL band plan 997 and 998.Automode is a feature that enables devices that support multiple standards in ADSL2 family to select the best mode of operation.For example,a device that supports ADSL2 Annex A,ADSL2 Annex L(RE-ADSL2)and ADSL2+Annex A,will be able to probe the line and select the mode of operation that provides the highest data rate for the user.In general,ADSL2 Annex A will work best on medium length lines(between 8-15 kft),RE-ADSL2 will work best on long lines(16 kft)and ADSL2+Annex A will work best on short lines(8 kft).,UTStarcom Confidential,19,家庭网关技术探讨,VOIP介绍why VOIP,Voice over IP(VoIP)is getting popular in the market.It enables a telecommunication company to cut costs by allowing a single network to transmit both data and voice traffic.Offers inexpensive rate for long distance calls.Voice quality resulting from packets transmitted over the IP network is comparable to the voice quality in Public Switched Telephone Network(PSTN).Separation of media and call controllingMedia conversion close to the traffic source and sinkThe call-handling functions is centralized.A call agent(media gateway controller-MGC)can control multiple gateways.New features can be added more quickly.,UTStarcom Confidential,20,家庭网关技术探讨,VOIP介绍VOIP architectures,H.323 based architectureGatewayGatekeeperMGCP/MEGACO based architectureMGC(master)MG(slave):termination,context,streamSIP based architectureSIP serverRegistrarProxy/redirect serverLocation serverUA,UTStarcom Confidential,21,家庭网关技术探讨,VOIP介绍MGC/MG based protocol history,UTStarcom Confidential,22,家庭网关技术探讨,VOIP介绍Megaco connection model,Based on 3 concepts:TerminationIdentifies an end point for media flowsImplements Signals,and generates EventsCan appear in at most one context.Permanent(provisioned)terminations can exist outside a contextContextDefines communication between Terminations,acts as a mixing bridgeContains 1 or more TerminationsSupports multiple streamsStreamA context can have multiple streams,each typically for a medium,e.g.audio,video,etcThe MGC specifies which streams a given termination supports,UTStarcom Confidential,23,家庭网关技术探讨,VOIP介绍what is SIP,Developed in IETFOld standard RFC 2543,February 1999Current standard:RFC 3261,June 2002An application-layer control(signaling)protocol for creating,modifying,and terminating sessions with one or more participants.Can be used for voice,video,instant messaging,gaming,etc.Text-based Messages,User id:SIP:,600610.4.41.210,UTStarcom Confidential,24,家庭网关技术探讨,VOIP介绍what is SIP,Network,Application,Data Link,Transport,UTStarcom Confidential,25,家庭网关技术探讨,VOIP介绍SIP advantages,SIP is a part of the IETF toolkitIt can be used with other IETF protocols to build a complete multimedia architecture.(RTP,SDP)Separation between establishing and describing a sessionIt can now be used together with SDP,for instance,to establish Voice over IP(VOIP)sessions.Intelligence in the end system:end-to-end protocolSIP servers have an equally well-defined task:routing SIP requests based on the Request-URI and responses based on Via headers.InteroperabilityNegotiation guarantees real interoperability between all the SIP users in the network.Scalability SIP pushes the intelligence to the end system and obviates the need to store state information inside the network during a session.SIP as a platform for service creation This is the most important feature of SIP.,UTStarcom Confidential,26,家庭网关技术探讨,VOIP介绍SIP architecture,UTStarcom Confidential,27,家庭网关技术探讨,VOIP介绍SIP methods,SIP is based on the Web protocol HTTP and like HTTP,is a request/response protocol.User Agent Client(UAC)-The User Agent(UA)sending requests.User Agent Server(UAS)-The User Agent(UA)returning responses.A SIP request,together with the responses it triggers,is referred to as a SIP transaction.,UTStarcom Confidential,28,家庭网关技术探讨,VOIP介绍SIP methods,INVITE Requests a sessionACK-Acknowledge the final response to the INVITECANCEL Cancels a pending transaction.BYE Terminates a sessionREGISTER Sends users address to serverOPTIONS Ask for server capabilities,UTStarcom Confidential,29,家庭网关技术探讨,VOIP介绍SIP methods,INVITE Requests a sessionACK-Acknowledge the final response to the INVITECANCEL Cancels a pending transaction.BYE Terminates a sessionREGISTER Sends users address to serverOPTIONS Ask for server capabilities,UTStarcom Confidential,30,家庭网关技术探讨,VOIP介绍voice coding,Coding implementationDSPhost CPUCoding methodsG.711a/u:64kbps,10ms frame length,107.2bps bandwidth occupied(IP packet overhead:0.432)G.729a/b:10kbps,10ms frame length,53.2kbps bandwidth occupiedG.726:40kbps,32kbps,24kbps,16kbps,10ms frame length,75.2kbps bandwidth occupiedG.723.1:5.3kbps or 6.4kbps,30ms frame length,19.5 or 20.8kbps bandwidth occupiedQuality key pointecho cancellation length:usually at least 16msjitter buffer:usually at least 500ms,UTStarcom Confidential,31,家庭网关技术探讨,WLAN介绍概述,WLAN指以无线信道作为传输介质的计算机局域网。无线通信只要求两台计算机之间能传输数据无线网络要求以无线方式相连的计算机能共享资源，具有有线网络系统所支持的各种功能。WLAN的三大技术IEEE 802.11xETSI HiperLANASTM DSRC（交通、道路、运输）,UTStarcom Confidential,32,家庭网关技术探讨,WLAN介绍拓扑结构,UTStarcom Confidential,33,家庭网关技术探讨,WLAN介绍拓扑结构,UTStarcom Confidential,34,家庭网关技术探讨,WLAN介绍802.11与WIFI,IEEE 802.11特点提供异频和限时发送服务多屏显示传递服务网络管理服务注册和认证电源管理宽带安全性寻址什么是Wi-Fi?“Wireless Fidelity”(无线相容性认证)IEEE 802.11a、802.11b、802.11g无线连接计算机网络通常用来访问Internet,UTStarcom Confidential,35,家庭网关技术探讨,WLAN介绍物理层关键技术,DSSS调制技术（直接序列扩频）DBPSK：1Mbps数据速率下采用。DQPSK：2Mbps的数据速率采用，这种方法每次处理两个比特码元。基于CCK的QPSK：是11b标准采用的基本数据调制方式。它采用了补码序列与直序列扩频技术，传输速率分为1，2,5.5和11Mbps。CCK通过与接收端的Rake接收机配合使用，能够在高效率的传输数据的同时有效的克服多径效应。但这几种技术都无法实现在更高速率下的通信。,UTStarcom Confidential,36,家庭网关技术探讨,WLAN介绍物理层关键技术续,OFDM技术OFDM技术是在频域内将给定信道分成许多正交子信道，在每个子信道上使用一个子载波进行调制，并且各子载波并行传输，从而有效的抑制无线信道的时间弥散所带来的ISI。由于在OFDM系统中各个子信道的载波相互正交，于是它们的频谱是相互重叠的，这样不但减小了子载波间的相互干扰，同时又提高了频谱利用率。PBCC调制技术PBCC调制技术是由TI公司提出的,已作为802.11g的可选项被采纳。PBCC也是单载波调制,但它与CCK不同,它使用了更多复杂的信号星座图。PBCC采用8PSK,而CCK使用BPSK/QPSK；另外PBCC使用了卷积码，而CCK使用区块码。PBCC可以完成更高速率的数据传输，其传输速率为11，22和33Mbps。,UTStarcom Confidential,37,家庭网关技术探讨,WLAN介绍802.11MAC,802.11MAC设计目标单个MAC支持多个PHY抗干扰能力强处理隐藏节点问题支持限时服务、QoS重载下可扩展并且稳定提供节能模式提供私密性和访问控制,UTStarcom Confidential,38,家庭网关技术探讨,WLAN介绍802.11标准比较802.11a,物理层:采用OFDM（正交频分多路复用）技术工作频段是5GHz的ISM数据速率为54Mbps采用了54个频率，48个用于数据，4个用于同步控制MAC层与其他802.11标准相同,UTStarcom Confidential,39,家庭网关技术探讨,WLAN介绍802.11标准比较802.11b,2001被IEEE批准，2003正式发布物理层：采用HR-DSSS(高速率直接序列扩频)技术工作频段是2.4GHz数据速率为1、2、5.5Mbps/11Mbps覆盖范围是11a的7倍产品已经发展到第四或第五代大部分缺陷已经得到解决16Mbps的吞吐量能满足多种应用的需求,UTStarcom Confidential,40,家庭网关技术探讨,WLAN介绍802.11标准比较802.11g,2001被IEEE批准，2003正式发布物理层采用OFDM（正交频分多路复用）技术工作频段是2.4GHz数据速率最大为54Mbps兼备802.11a和802.11b的特点比802.11a的功耗小、传输距离长、穿透力强,UTStarcom Confidential,41,家庭网关技术探讨,WLAN介绍综合比较,信道数量802.11a在美国可提供8个无重叠的信道802.11b/802.11g则共享3个带宽吞吐量会因距离、障碍和干扰而产生很大的变化802.11a和802.11b带宽之间的差距理论上是43Mbps，而实际上只有30Mbps频带802.11b/g所用的2.4GHz频带正日益拥挤5.8GHz系统的相互干扰要比2.4GHz系统低,UTStarcom Confidential,42,家庭网关技术探讨,WLAN介绍标准系列,802.11a 50m,54 Mbps802.11b 100m,11Mbps802.11g 100m,54Mbps802.11c 用于改进设备之间的互操作802.11d 扩充802.11无线局域网在其他国家应用。802.11e 改进和管理WLAN的服务质量。802.11f 实现不同厂商无线局域网之间的互操作。802.11h 增强5GHz波段的802.11MAC规范以及802.11b高速物理层规范。802.11i 增强WLAN的安全和鉴别机制。802.11s 无线MESH机制802.1x Authentication、Authorization、Auditing,UTStarcom Confidential,43,Thanks！,WBU2006-04,