IP网络视频会议的QoS技术研究与实现
摘要
随着IP网络与Internet在当今使用得越来越广泛,基于IP网络的视频会议系统也越来越为广大的消费者所接受而召开网络视频会议最重要的就是要保证有良好的音视频质量。现阶段IP网络的状况是比较复杂的,带宽参差不齐、时延大、不稳定。如何在IP网络上保证用户信息传输的质量就成为一个不容忽视的重要问题,为解决这一问题,网络服务质量(QoS,Quality of Service)便应运而生。QoS是网络与用户之间以及网络上互相通信的用户之间关于信息传输与共享的质的约定,例如,传输时延允许时间、最小传输画面失真度以及声像同步等。对于由QoS控制来实现QoS保证,IETF(Internet Engineering Task Force)组织提出了集成模型(IntServ)、区分业务模型(DiffServ)、多协议标签交换(MPLS)技术、流量工程(Traffic Engineering)等多种控制和管理方案。
当前盐城地税现有主干MSTP线路和备份SDH线路,为更好的利用现有网络的增值应用,盐城地税实施IP方式视频会议项目,为不影响税务征收管理的主体应用,同时要保证视频会议使用质量。本文就盐城地税的IP视频会议系统如何在现有的网络中保证它的应用效果和质量展开研究和讨论,通过策略路由、网络带宽调整、音视频同步等方法来达到理想的效果。
Currently, with the widely use of IP network and Internet, the video conference system based on IP network is accepted by more and more consumer. So It' s very important for holding a network video conference to assure its good audio and video quality. There are some problem for current IP network, such as irregular network bandwidth , big time delay , instability, hence, how to guarantee user information transmission quality in IP network become an indispensable problem. In order to solve this problem, Quality of service emerges as it requires. QOS is an contract about information transmission and share quality between either network and user or users who communicate with each other, for example, transmission latency allowing time, the minimal image degree of distortion and synchronization of voice and image. IETF puts forward several control and manage QoS schemes which include Integrated Service , Differential service, Multi-Protocol label switching and traffic engineering
Today, YanCheng local taxation bureau have main MSTP and backup SDH, IP video conference project is implemented in YanCheng Local taxation bureau for making better use of network value-added application. Under the condition of not influencing the main application of Tax collection management, the thesis researches and discusses how to assure the impact and quality of service in IP video conference system based on current IP network, the perfect effect is obtained by taking policy route , adjusting network band and synchronizing audio and video.
当前盐城地税现有主干MSTP线路和备份SDH线路,为更好的利用现有网络的增值应用,盐城地税实施IP方式视频会议项目,为不影响税务征收管理的主体应用,同时要保证视频会议使用质量。本文就盐城地税的IP视频会议系统如何在现有的网络中保证它的应用效果和质量展开研究和讨论,通过策略路由、网络带宽调整、音视频同步等方法来达到理想的效果。
Currently, with the widely use of IP network and Internet, the video conference system based on IP network is accepted by more and more consumer. So It' s very important for holding a network video conference to assure its good audio and video quality. There are some problem for current IP network, such as irregular network bandwidth , big time delay , instability, hence, how to guarantee user information transmission quality in IP network become an indispensable problem. In order to solve this problem, Quality of service emerges as it requires. QOS is an contract about information transmission and share quality between either network and user or users who communicate with each other, for example, transmission latency allowing time, the minimal image degree of distortion and synchronization of voice and image. IETF puts forward several control and manage QoS schemes which include Integrated Service , Differential service, Multi-Protocol label switching and traffic engineering
Today, YanCheng local taxation bureau have main MSTP and backup SDH, IP video conference project is implemented in YanCheng Local taxation bureau for making better use of network value-added application. Under the condition of not influencing the main application of Tax collection management, the thesis researches and discusses how to assure the impact and quality of service in IP video conference system based on current IP network, the perfect effect is obtained by taking policy route , adjusting network band and synchronizing audio and video.
引文
1 何宝宏.IP虚拟专用网络.人民邮电出版社,2002
2 曹蓟光.多媒体业务服务质量相关问题的研究.现代电信科技,2004
3 带宽管理.http://www.iet.unipi.it/～luigi/ip_dummynet
4 Eric Osborne.基于MPLS的流量工程.人民邮电出版社,2003
5 王岩编译.无线多媒体服务质量协议——关乎生活的技术.计算机世界网,2005:4-22
6 钟玉琢,杨军.视频信号处理系统结构概况.现代计算机技术博览,2003
7 杨行峻等.语音信号数字处理.北京电子工业出版社,2004
8 胡晓峰.多媒体系统原理与应用.北京人民邮电出版社,2006
9 高文.多媒体数据压缩技术.北京电子工业出版社,2003
10 Almquist,P Type of Service in the Internet Protocol Suite.RFC 1349.2002
11 Braden,R.,Clark,D.and S.Shenker.Integrated Services in the Internet Architecture:An Overview.RFC 1633,2004
12 S.Blake,D.Black,M.Carlson,E.Davies,Z.Wang An Architecture for Differentiated Services,RFC2475,1998
13 下一代网络的服务质量保证(QoS)体系.新浪网2004全球NGN高峰论坛专题.http://tech.sina.com.cn/
14 Bell LabMethod for providing QoS for delay sensitive traffic over IP network.U.S Patent,US 6529499 B1.Mar4,2003
15 赵德宽,王京,张震,刘红旗.IP QoS结构与SLA保证研究.数据通信,2004(1)
16 汪澍.企业VoIP网络的呼叫控制网络世界.No.15,2003.5
17 赵慧玲,徐向辉.支持QoS的下一代网络结构框架的研究,http://www.chinatelecom.com
18 童晓渝,李安渝,方旭明,陆斌.软交换技术与实现成都:西南交通大学出版社,2004(4)
19 刘树林,邱菀华.多属性决策基础理论研究.系统工程理论与实践.2003,18(1):38-43
20 王海涛,郑少仁.IP QoS服务模型及其相关问题的探讨,http://www.btxx.cn.net/china-tc/200103/200103_09.htm
21 杨胜文,史美林.一种支持QoS约束的Web服务发现模型.计算机学报.2005,28(4):589-594
22 Cristina Aurrecoechea,Andrew T.Campbell,Linda Hauw.A survey of QoS architectures Multimedia system.1998 vol.16:138-151
23 F.Cheong,R.Lai.QoS specification and mapping for distributed multimedia system:A survey of issues,The Journal of System and Software,1999,No.45:127-139
24 G.Lu.Issue and technologies for supporting multimedia communications over the Internet,Computer Communication,2000,No.23,1323-1335
25 L.A.Guedes P.C.Oliveira,L.F.Faina,E.Cardozo.An agent-base approach for supporting quality of service in distributed multimedia systems Computer Communication,1998,No.21:1269-1278
26 N.Wakamiya,M.Murata,H.Miyahara.On video coding algorithms with application leve QoS guarantees.Computer Communication,,2000,No.23:1459-1469
27 N.Yeadon et al Continuous Media Filters for heterogeneous Internetworking,Proc.SPIE.,1996 Vol.2667:246-257
28 ITEF working Group On Integrated Service
29 ITEF working Group On Differentiate Service
30 Horlait Eric Rouhana Nicolas.Differentiated Services and Integrated Services Use of MPLS.Fifth IEEE Symposium on Computers and Communications(ISCC 2000)July 04-06 2000 Antibes,France.:194
31 Awduche D Berger L.RSVP-TE:Extensions to RSVP for LSP Tunnels.RFC 3209http://www.faqs.org/rfcs/rfc3209.html Dec.2001
32 Bernet Y et al.A framework for Integrated Services Operation over Diffserv Networks.RFC 2998.http://www.faqs.org/rfcs/rfc2998.html.Nov.2000
33 Classifying VoIP Signaling and Media with DSCP for QoS http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ft_dscp.pdf
34 Heinanen J,Baker F.Assured Forwarding PHB Group,RFC-2597,Jun-99
35 Faucheur F Le,et al Multi-protocol Label Switching(MPLS)Support of Differentiated Services.RFC 3270 May-02
36 RFC 1633 Integrated Services in the Internet Architecture:An Overview
37 RFC 2474 Definition of the Differentiated Services Field(DSField)in the IPv4 and IPv6 Headers
38 RFC 2475 An Architecture for Differentiated Services
39 RFC 2702 Requirements for Traffic Engineering Over MPLS
40 Liu SL,Qiu WH.Studies on the basic theories for MADM Systems.Engineering Theory & Practice.1998,18(1):38-43(in abstract).Chinese with English
41 Ran S.A model for Web services discovery with QoS.ACM SIGCOM Exchanges 2003,4(1):1-10
42 Shibata Y,Gonad Y.Extension of de Bruijn graph and Kautz graph.Computers Mathematic Application.1995,30(9):51-61
2 曹蓟光.多媒体业务服务质量相关问题的研究.现代电信科技,2004
3 带宽管理.http://www.iet.unipi.it/～luigi/ip_dummynet
4 Eric Osborne.基于MPLS的流量工程.人民邮电出版社,2003
5 王岩编译.无线多媒体服务质量协议——关乎生活的技术.计算机世界网,2005:4-22
6 钟玉琢,杨军.视频信号处理系统结构概况.现代计算机技术博览,2003
7 杨行峻等.语音信号数字处理.北京电子工业出版社,2004
8 胡晓峰.多媒体系统原理与应用.北京人民邮电出版社,2006
9 高文.多媒体数据压缩技术.北京电子工业出版社,2003
10 Almquist,P Type of Service in the Internet Protocol Suite.RFC 1349.2002
11 Braden,R.,Clark,D.and S.Shenker.Integrated Services in the Internet Architecture:An Overview.RFC 1633,2004
12 S.Blake,D.Black,M.Carlson,E.Davies,Z.Wang An Architecture for Differentiated Services,RFC2475,1998
13 下一代网络的服务质量保证(QoS)体系.新浪网2004全球NGN高峰论坛专题.http://tech.sina.com.cn/
14 Bell LabMethod for providing QoS for delay sensitive traffic over IP network.U.S Patent,US 6529499 B1.Mar4,2003
15 赵德宽,王京,张震,刘红旗.IP QoS结构与SLA保证研究.数据通信,2004(1)
16 汪澍.企业VoIP网络的呼叫控制网络世界.No.15,2003.5
17 赵慧玲,徐向辉.支持QoS的下一代网络结构框架的研究,http://www.chinatelecom.com
18 童晓渝,李安渝,方旭明,陆斌.软交换技术与实现成都:西南交通大学出版社,2004(4)
19 刘树林,邱菀华.多属性决策基础理论研究.系统工程理论与实践.2003,18(1):38-43
20 王海涛,郑少仁.IP QoS服务模型及其相关问题的探讨,http://www.btxx.cn.net/china-tc/200103/200103_09.htm
21 杨胜文,史美林.一种支持QoS约束的Web服务发现模型.计算机学报.2005,28(4):589-594
22 Cristina Aurrecoechea,Andrew T.Campbell,Linda Hauw.A survey of QoS architectures Multimedia system.1998 vol.16:138-151
23 F.Cheong,R.Lai.QoS specification and mapping for distributed multimedia system:A survey of issues,The Journal of System and Software,1999,No.45:127-139
24 G.Lu.Issue and technologies for supporting multimedia communications over the Internet,Computer Communication,2000,No.23,1323-1335
25 L.A.Guedes P.C.Oliveira,L.F.Faina,E.Cardozo.An agent-base approach for supporting quality of service in distributed multimedia systems Computer Communication,1998,No.21:1269-1278
26 N.Wakamiya,M.Murata,H.Miyahara.On video coding algorithms with application leve QoS guarantees.Computer Communication,,2000,No.23:1459-1469
27 N.Yeadon et al Continuous Media Filters for heterogeneous Internetworking,Proc.SPIE.,1996 Vol.2667:246-257
28 ITEF working Group On Integrated Service
29 ITEF working Group On Differentiate Service
30 Horlait Eric Rouhana Nicolas.Differentiated Services and Integrated Services Use of MPLS.Fifth IEEE Symposium on Computers and Communications(ISCC 2000)July 04-06 2000 Antibes,France.:194
31 Awduche D Berger L.RSVP-TE:Extensions to RSVP for LSP Tunnels.RFC 3209http://www.faqs.org/rfcs/rfc3209.html Dec.2001
32 Bernet Y et al.A framework for Integrated Services Operation over Diffserv Networks.RFC 2998.http://www.faqs.org/rfcs/rfc2998.html.Nov.2000
33 Classifying VoIP Signaling and Media with DSCP for QoS http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ft_dscp.pdf
34 Heinanen J,Baker F.Assured Forwarding PHB Group,RFC-2597,Jun-99
35 Faucheur F Le,et al Multi-protocol Label Switching(MPLS)Support of Differentiated Services.RFC 3270 May-02
36 RFC 1633 Integrated Services in the Internet Architecture:An Overview
37 RFC 2474 Definition of the Differentiated Services Field(DSField)in the IPv4 and IPv6 Headers
38 RFC 2475 An Architecture for Differentiated Services
39 RFC 2702 Requirements for Traffic Engineering Over MPLS
40 Liu SL,Qiu WH.Studies on the basic theories for MADM Systems.Engineering Theory & Practice.1998,18(1):38-43(in abstract).Chinese with English
41 Ran S.A model for Web services discovery with QoS.ACM SIGCOM Exchanges 2003,4(1):1-10
42 Shibata Y,Gonad Y.Extension of de Bruijn graph and Kautz graph.Computers Mathematic Application.1995,30(9):51-61