What is the part1. NGN?
1.1 Introduction NGN Next Generation Networking is a network characterized by business driver, peeling out from the bearer network, flexibly build on a unified open platform, due to the openness and standardity of the platform, the future Business developers may be operators, or third parties, so that the type of business can be greatly enriched.
NGN should be a comprehensive, fully open network platform system that can provide various services such as voice, data, multimedia, etc., as one of the core technologies of the next generation of business networks - soft exchange (Softswitch) is currently universal. stand by. SoftSwitch thinks for the long family of IP, ATM, IN and TDM, forming a hierarchical fully open system architecture, making each operator can use the Softswitch system products according to their own needs, all of them with the SoftSwitch system, adopting their own Network Solutions Find your own network footpoint while leaving existing resources.
1.2 NGN characteristics First, NGN's network structure pair voice and data adopts a packet-based transmission mode and adopts a unified protocol. It separates the functional modules of the traditional switch into independent network components, which are interconnected by standard open interfaces, which make the original telecommunications networks to open, operators can freely combine the functions of each part according to the needs of the business. Products to form new networks. Standardization of the part between the components can realize interworking of various heterogeneous networks.
Second, NGN is also a network that is independent of the network, and implements relatively independent business systems through business and call control and call control and bearer separation, allowing business and networks to provide and independently develop, providing flexible and effective business creation, business applications. And business management functions, support different bandwidth, real-time or non-real-time media services, allowing business and applications with greater flexibility, to meet the business needs of users to develop updates, making the network have The ability and competitiveness of sustainable development.
Third, NGN implements interworking with existing networks, such as PSTN, ISDN, and GSM, etc. through the gateway device, and NGN also supports existing terminals and IP intelligent terminals, including analog telephones, fax machines, ISDN terminals, mobile phones, GPRS terminals. , SIP terminal, H248 terminal, MGCP terminal, Ethernet telephone, cable modem, etc. by PC.
1.3 NGN functional model NGN is a comprehensive big network that combines existing various network environments and peripheral access devices and end products. We can divide it into four layers from the perspective of functionality. The service layer, the control layer, the media layer, and the transmission access layer. Table 1. Four major functional levels
Function Hierarchical Function Service Transport Access Layer Connect users to the network, centralized user services to deliver them to destination, including various access methods; media layers convert information format to the information format that can be passed on the network. For example: split voice signals into an ATM cell or IP package. In addition, the media layer can route information to the destination. The control layer contains call intelligence; this layer determines the service received by the user and can control the processing of low-layer network elements to traffic flow. The network service layer provides additional services on the basis of call establishment, such as value-added services, intelligent services. In the geographical model, NGN is divided into a 4-stage model of backbone network, metro network, access network, and user station network. The backbone network is a network connected to the city and the city. The metropolitan area network is a network connected to a number of business spots connected to the city. The access network solves the last kilometer (from the business sink to the building, community, campus, etc.). The user's station network is a network in the building, community, and campus.
What is PART2. NGN brought? It is popular that the next generation network is a combination of traditional voice services and data multimedia services and cable television networks. Although the industry has aware of the concept of the next generation network, people have reached a consensus: the next generation network combines the telecommunications network, computer network and cable TV network, allowing telecommunications and TV and data business into one. Composition can provide new networks available on three networks, data, video, and various services provided on three networks. The application of these different natures should also be optimized, and the use of network resources is efficient, reasonable, thus achieving maximum extent of network resources. Three-network combination, therefore, you can: pass NGN, allowing the fixed phone to have a personalized and roaming function like the phone. Going out, as long as you enter a local area network, the call will automatically transfer to your local phone when others call this number. You can set the office phone, home phone, and mobile phones, so that no matter what phone calls, what is the phone call, you will go to you smoothly. When traveling, the phone can provide you with the actual geographic location information through NGN. ............ 2. NGN provides new business NGN to increase many of its own business forms on the basis of the original PSTN, ISDN, intelligent network, etc.
Business Name Business Content 1) The entry service is mainly for the user's terminal environment, providing monitoring, coordination, etc., and provides users with a personalized business environment. It is the basic component of Vhe (Virtual Home Environment, a virtual home environment). 2) The enhanced multimedia session business maintains multi-multimedia sessions without terminating sessions because there is a session manner to add or leave the session. 3) Video can be built in mobile / fixed, mobile / moving, fixed / fixed calls. 4) Web conferencing business can organize multimedia meetings through web browsing.
5) Enhanced session Waiting to allow users to process real-time calls (such as real-time calls, etc.). 6) The speech recognition service automatically identifies the voice and the corresponding operation of standard or prior user settings. 7) Support for text to voice bidirectional conversion.
8) The basic positioning business is mainly used on the phone to provide the actual location. 9) Personal routing strategy different times, the system control user's routing policy is selected to transfer the incoming call to a different phone. 10) VOD video on demand service, users can subscribe to different video stream services as needed. 11) The enhanced call function is involved in the increasing call type of call, so that the transfer of the corresponding call / session transfer has also been strengthened. At the same time, the session merge function is also added, that is, two calls or incoming calls can be integrated into a triplet session.
Development and Prospect of Part3. NGN
3.1 Outlook of NGN Application
A soft exchange, IPv6, etc. can provide multimedia integrated business such as voice, video, data, using open, standard architecture, and can provide rich business NGN emergence and become a hot spot for people.
3.2 NGN historical background
The background of the next generation network, one is a large change in traffic and external environment, and the telecommunications industry tries to adapt to the latest technical achievements, and proposes the overall ideas and ideas of the next generation network development, and a series of results programs. NGN is like a big umbrella, many areas, the most important of which is five areas. First, the next generation of switched networks. The most important feature is soft exchange. The second is the next generation of access network, including WLAN, etc. The third area is next generation transfer network, including a new generation of MSTP, Asom, the fourth next-generation Internet, IPv6, the fifth is the next generation of mobile network, 3G
.
3.3 NGN, spring is coming
Next-generation network, as current operators and equipment manufacturers are actively discussing hot technology, and many standardized organizations and forums abroad, including ITU-T, 11th and 16 Workings, IETF IP Telephony Working Group, Signaling Transfer Work Group, Media Gateway Control Working Group, ETSI Tiphon, International Softswitch Association, MPLS Forum, ATM Forum, DSL Forum, Parlay, etc. ITU-T believes that NGN is the specific implementation of GII, which represents the global infrastructure GII. The development trend of network fusion is a variety of diverse, network interoperability and business interoperability are key content of NGN research. Existing networks have problems. ITU-T 13th Study Group will complete the definition stage of NGN standardization project in December 2002, and fully define the Connotation of NGNs, related network architectures and implementation guides in 2004.
In China, the construction of the next generation network has also been in full swing. my country Network and Exchange Standard Research Group and IP Research Group began related criteria for NGN networks in 2000.
On July 6, 2001, my country's high-speed interconnected test network passed the national identification in Tsinghua University. my country has made a major breakthrough in the field of next-generation Internet research and construction, achieving the international next-generation Internet. BISC / Siemens will use our world's leading NGN solution SURPASS to China Telecom Architecture NGN network, providing integration of voice, data, image, etc., including multiple access methods NGN end-to-end overall solutions; China Telecom The Group has cooperated with the Nortel Network in Beijing, Shanghai, Guangzhou and Shenzhen Deploying Nortel Network Succession NGN solution; in October 2002, the 2nd "NGN Technology Forum" in China from October 2002, from the information industry, education, finance, telecommunications, etc. About 280 experts from domestic and foreign experts, surrounded the development trend of "NGN technology", launched a warm discussion, with the gradual advancement of NGN construction process, the world's traditional network will become faster and faster, we It is completely reason to believe that NGN's spring is coming.
Standard and Technology of NGN
4.1 NGN core
4.1.1
Soft exchange is the core technology of NGN. As a packet switched network, a new solution for conventional PSTN networks, SoftSwitch (soft exchange) combines PSTN's reliability and the flexibility of the data network, which is a new technological means of emerging operators into the voice market. The traditional voice network is evolved to a split voice. At present, SOFTSwitch has been accepted and adopted by more and more operators as the core components of the next generation network (NGN).
4.1.2
What is SoftSwitch?
SoftSwitch is a functional entity that provides call control and connection control functions for services with real-time requirements for the next generation network NGN, which is the core of the next generation of network calls and control. Simply put, SoftSwitch is an entity that implements the "call control" function of the traditional program-controlled switch, but the traditional "call control" function is different from the business combined, the call control functions required by different business needs, and SoftSwitch is The business is independent, which requires the call control function provided by SoftSwitch to be basic call control for various services. 4.1.3
Basic elements of SoftSwitch
SoftSwitch technology is the most significant feature of other technologies, and the three basic elements of their core ideas are: open business generating interfaces; integrated equipment access capabilities; policy-based operational support systems. The currently more common views believe that the SoftSwitch system should consist of the following equipment:
Table 3. SoftSwitch's architecture composition
Component part name (Chinese)
Component
Soft exchange control device
SoftSwitch Control Device
business platform
Service Platform
Signaling gateway
Signaling Gateway
Media gateway
Media Gateway
IP terminal
IP Terminal
Other support equipment
Others
4.2 Other support technologies of NGN At present, the main technologies of the global support NGN have IPv6, fiber high-speed transmission technology, optical exchange and intelligent optical network, broadband access, metro network, soft exchange,
3G
Overhead
3G
, IP terminal, network security technology. IPv6: Expand the address space, improve the overall throughput of the network, the quality of service is greatly improved, security has a better guarantee, support plug and play and mobility, and achieve multicast function.
Are you far from NGN?
5.1 NGN brings the ideological conversion of the business model of the traditional network is very simple, all based on the call time (by mou). In this case, the value chain of the business is relatively short. Operators pay attention to how to expand the capacity of the network and increase the call market, and the development of the business is at the secondary status.
Compared with the value chain of traditional networks, NGN's value chain is longer, involving more, need to participate in ISP, ICP, software developers, terminal manufacturers, etc. These services attract users by content, not communication skills. Therefore, the number of business, the development and supply of business, and the speed replacement of the bearer network becomes the core competitiveness of the operator.
Developing new services from third parties becomes a trend of NGN. The revolutionary change brought by NGN is: In the value chain of NGN, the operator's task no longer only looks for users, but how to create a suitable environment, soil, allowing all kinds of services to be able to come.
5.2 A market that requires NGN We can clearly see the broad market in information, and the traditional switch has a lot of weaknesses in new business development. Therefore, NGN's softswitch equipment gradually replaces traditional switches and become the main equipment of network construction. The trend is obvious. As a fixed telephone operator, China Telecom starts to test NGN, namely the possibility of ngn to the NGN domestic implementation from qualitative to quantitative tests. In summary of NGN test in Shanghai, Hangzhou, Guangzhou, Shenzhen, China Telecom Group Corporation, said China Telecom will invest millions of yuan in R & D NGN, and increase its network cost, increase Business revenue, develop new business strategic new ways. NGN will be China Telecom's main strategic transformation task in the next 10 ~ 15 years, and NGN's commercial sailing is ie. 5.3 A new industrial chain forms a wide range of network service providers will benefit from the IPv6 unlimited application prospects. More profitable and more professional applications will grow the strength of service providers. Due to network capacity and transmission speed improvement, various videos, multimedia applications will have a large income of network service providers like the current SMS and online games. . NGNs are greatly improved due to capacity and speed, there are more more valuable services, establish new business models, new business relationships, new value chains. With the in-depth of IPv6's commercialization, IPv6's industrial chain finally go to mature, and the promoters of each link on the industry chain will also become the last winner. Reference
* Mobile communication online media http://www.mc21st.com/techsubject/subjects/NGN * "China NGN Commercial Syroctive Safe" Mobile Communications National Engineering Research Center 2004.3 * "2004 Global NGN Summit Forum" Topics Speech "China Telecom Group General Engineer Wei Leping 2004.4 Appendix
Some professional terms
Term Name Interpretation 248 / Megaco Media Gataway Control Protocal, ITF, ITU-T Developed Media Gateway Control Protocol, used for communication between media gateway controllers and media gateways; H.248 protocol is also known as Megaco / H.248 ISDN Integrated business digital network GSM based on traditional telephone network GSM current largest digital cellular communication system GPRS universal packet wireless service
3G
The third generation mobile communication ITU International Telecommunication Alliance ITF Internet Engineering PSTM A circuit switching network based on analog technology, and the channel is connected to a number of telephone switches.
