At present, the fixed-line broadband subscriber market is showing rapid growth and expansion, and a variety of new broadband wireless access technology is the emergence of Internet-based business applications to bring the convenience.
Meanwhile, the use of the Internet platform has been demonstrated that a variety of attractive new business prospects arising. And, with the further development of Internet technologies, users and business to provide large capacity popularity rising, the future of the IMS network will provide business development has brought a lot of uncertainty.
IMS fate of the still suspense
2004 02ITU-TSG13 meeting after a heated debate, the definition of NGN is given: "NGN is a packet network, which provides telecommunications services, including including a variety of businesses, can use a variety of bandwidth and QoS capabilities with the delivery technology, business functions to achieve the separation of the underlying transmission technology; It provides users with different network service providers the freedom to access, and support the universal mobility for business users to use to achieve consistency and uniformity. "
NGN from this definition that the definition of the target launch requirements only and is not limited to the use of that technology.
The current development of the NGN system will be unified with the QoS capabilities of IP / MPLS bearer network supports a variety of services. 3GPP's IMS NGN will be used as a multimedia service control and network convergence platform. IMS is a multimedia PS domain control / call control platform in support of the session class and non-session class multimedia services, the core features of SIP protocol is used with the distributed nature of access to independent features and standard open service control interfaces.
The system has two characteristics: first operation can be managed in the IP network, the second is based on the client-server model.
IMS system is the traditional telecom operators along the IP evolution path to full development, to meet the traditional telecom network evolution towards all-IP needs to support mobile and fixed network convergence FMC, to support triple play Tripleplay. IMS architecture in a manageable IP professionals online, to support the existing telecom operators and billing model, the establishment of a carrier-oriented chain, just like today's China Monternet, as it can to ensure the interests of operators maximized. For businesses, large customers, VIP and other users, QoS, and security on the special requirements and be willing to pay higher fees, IMS might be a good choice, IMS to meet this market demand.
But for the majority of broadband consumers may not accept this model. Broadband consumers are now generally accepted monthly pattern, free ride on the Internet. IMS operators can be managed in the IP network, not to accept the open Internet, the concept of autonomy, thus losing the advantages of the Internet everywhere. IMS principles and monthly billing system is incompatible. Thus, broadband consumers (including the use of flat-rate broadband wireless access users) will not accept IMS.
The early shock
On the Internet in recent years the rapid development of P2P technology and applications, P2P-based VoIP and P2P Internet TV rapid development, the challenges of IP-based telephony and softswitch-based client server model of IPTV. The P2PSIP of development, that may correspond to the development of IMS's operations on the Internet-based P2P platform.
As we all know, Skype Internet telephony with its superior sound quality and reach, attracting customers, the current total of 2.5 billion downloads, and more than 5 million online, you can, and PSTN interoperability, and also introduced VoIP for business users business . Support Skype, Wi-Fi handsets and 3G mobile phones are also under development. Skype Internet telephony using P2P technology, and adoption of client / server model based on P2P, IP phones compared to great advantage, building operating costs low, such as Skype, hundreds of thousands of super-nodes occupy only a small amount of network and computing resources .
In 2004, China began to use P2P streaming technology on the Internet website of live television. Currently, there are more than 10 sites to use their own software development, P2P streaming media broadcast business, giving rise to an P2PInternetTV wave.
During the 2006 Spring Festival, China Central Television and the joint use of P2P CDN technology to synchronize the video broadcast to the world. Peak concurrent users was 46.7 million, including 75,000 from overseas. By the end of 2005 using PPLive software live to see "Super Girls 2005-2006 New Year's Eve concert," the number of users exceeded a million yuan, of which 30% came from overseas. The first application of P2P content copyright protection technology, users need to receive free "tickets." P2PInternetTV in a short period of time, the rapid development of more than a year, by the end of 2005 to reach 2.5 million registered users, showing great vitality.
P2P live streaming now the main properties of sheets as follows: the rate television programs generally 3-500Kbps, some channels have started to provide 800Kbps bit rate. Picture quality than VCD. In 20 seconds -1 minute to complete the data buffer, and start playing, you can provide users with stable, clear television programs, usually do not appear pause playback problems. With the internal network through the "UPNP function. Ensure that users within the network. 5Mb/s-10Mb/s server to use the bandwidth to support export of one million while the number of users online and have the authentication and accounting platform.
"Overlay" in the post-oriole
Current P2P systems showed great superiority. But it also has its limitations. For example, the limitations of Skype software is that it is closed software, the interface is proprietary, which limits the further development of space. Current P2P Internet TV is specialized software systems and operating platforms, is not conducive to development. The NGN / IMS-based SIP protocol is an open architecture that can support various multimedia services. But IMS is designed to run on managed IP network, a centralized server, construction and operating costs are high, and with the continuous reduction in broadband rates, IMS business if the tariff on the highest high, it will also lose the user's trust. As Monternet the same as China Mobile's "private network", an annual revenue of one billion yuan or so, but spent 50% -60% of the cost of services. I hope that IMS will not re-take the Monternet in the past.
In addition, the performance of the face of the Internet is everywhere, if the combination of P2P and SIP, without a central server, with distributed architecture, operating in the public Internet may open up a new way to meet the requirements of NGN.
The operation can be managed in the IP network, to client / server architecture of a modern telecommunications system, P2P Overlay should be a disruptive technology. Today SkypeP2P P2P Internet telephony and Internet TV a strong impact on modern telecommunications system, VoIP and IPTV, are likely to form operating in the public Internet, a platform based on P2P networks overlap with existing NGN / IMS counter. Both systems may exist in parallel for some time.
Although today's SIPP2P technology is still developing, but has been demonstrated in the public Internet to create a multimedia platform P2PSIP technology trends. This based on the public Internet, but also can play the Internet distribution of performance of the system to better meet the needs of the development of Internet, new media, but also more in line with the Internet business model needs.
Way of being to develop some overlapping distribution network management system to address overlapping P2P network security.
Given there is no shaping of technology and ideas for the realization of next-generation networks, and any ideas and technology to be successful for the next-generation networks must flow through the test of large-scale networks, for which the United States established a National Science Foundation research program "Global Network Innovation Environment" GENI plans to build a distributed network environment for innovation, expansion of a new generation of network research, the development of innovative technologies. This innovation would be more disruptive, to the architecture from the agreement would be new. The current overlapping networks such as PlanetLab experimental network will provide ideas and support.
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