Saturday, October 23, 2010

Liu Yunjie Chinese Academy of Engineering: "Soft exchange untimely"

As the IMS and HSDPA, HSUPA rapid development, makes the soft exchange value and life cycle greatly reduced. Softswitch untimely, to this point, operators should be fully estimated.

We are talking about NGN, NGN we have defined four areas: the first is based on packet switching technology, most of IP technology; the second is to provide telecommunications services, including all business, including, for example video services; The third is to separate hosts and operational control, and bearing all the bandwidth to provide a QoS guarantee requirements; the fourth is to ask the user can select any operator, not the subject of a certain operator. Should be based on the definition of these four aspects, in accordance with the objectives of such direction to the NGN.

NGN concept is the development of the telecommunications industry for many years the concept of accumulation is the goal for many years. Background is a long time, the network is the traditional telecom industry, one a business network is separate, but the industry has been pursuing a goal, can you separate the network into a comprehensive unified network platform to evolve. 70 years from the last century the pursuit of ISDN, to the 80's B-ISDN, then 90 years of the Internet, do not achieve the intended purpose. Now we talk about the NGN, the ultimate goal is to achieve multi-service, to achieve network convergence.

To achieve this goal, from the perspective of the telecommunications sector has to face and solve four problems: the first is the load problems; second is how to achieve network bearer network integration; third, MAN and How to access the network in accordance with the concept of NGN deployment; the fourth is how realization of NGN network architecture business goals.

What to do with technology bearer network, which is plagued us for years, because it can provide routers and ATM bearer network is the two technologies, but the two technologies do not adapt. In addition to the other two technologies, there is no third technology? Router technology why not? In short, the time when the network failure, network routers and other nodes in the network took place less than perceived status, this is because the router does not test, no interaction network information function. ATM's problem is not the ability to handle IP, and now more than 90% of applications are all IP applications, so we come to a dead end that the ATM is gone, in fact, if coupled with IP-ATM processing capacity, or have applied prospects.

The second challenge, how in a variety of online business hosting? Solutions proposed by the industry through the design of the logic of virtual private network over the region, each private network has a business, every business has its own routing table, have their own QoS level, and between these logical networks mutual isolation, which would address reliability issues. This program provides a way to integrate the three networks, it is all in the pursuit of goals.

The third issue is to realize NGN, how to achieve integration in the MAN architecture? MAN to make some new architecture and standards, no new structure and standards, MAN will not meet the requirements of the next generation.

Now in the access network side, we note that the problem is UMA, is license-free mobile access. The question now is, cable network bandwidth is unlimited, bandwidth capacity increases, but the wireless network bandwidth is always limited, because by the frequency limitations. But the wireless applications from the current view of almost unlimited, and now wireless applications varied, scenic side is fine, we all moving in mobile aspects of development, this is a reality. This is a great contradiction between the two: one is the limited resources, the application of infinite; one is unlimited resources, applications, has many constraints. How these two technologies together like this is always the issues of foreign and domestic should follow up studies in this area.

Fourth, on operational integration issues. IMS and softswitch is now in the country yet there is no unified understanding and views, of course, very difficult. My view is that IMS softswitch with the biggest difference is that, IMS can provide more services for the application. Softswitch every business should have its own set of design, IMS is not only in the planning can be unified, in fact, can be done in the QoS context unification is not only a bearer and control separated, you can separate the user interface, all access into the way, whether mobile or fixed way means can be achieved. IMS data can also be centralized. From the business point of convergence, IMS has great appeal and advantages. In addition to providing voice softswitch outside the big problem is in the application have great limitations.

Softswitch and IMS architecture choice between, is the troubled telecommunications company, in doubt, look unclear. However, IMS will replace the soft switch, which has a global consensus.

As the IMS and HSDPA, HSUPA rapid development, makes the soft exchange value and life cycle greatly reduced. For this, operators should be fully estimated. My personal view is that the soft switching untimely.

Softswitch is five or six years ago, emerging technologies, just five or six years ago, the telecommunications, IT industry downturn, continue to go trough the process, which makes the soft switch has yet to push the use of, or application is not universal. When the IT industry began to rise from the bottom, when, IMS rapid development, makes the soft-switching will be relatively short life cycle.

Operating companies in the choice of soft-switching and IMS, if you consider the deployment of IMS architectures, requires network support HSDPA and HSUPA, and the related QoS mechanisms. Because IMS is not on, is not the standard into a mature, standards will change the future. Not on HSDPA, HSUPA, the IMS may, however, can only provide part of the business, can not provide all of the business.

In addition, IMS support for VoIP and multimedia services, the IMS is certainly risky, but the risks and benefits is the co-existence. Assess the risk, if the IMS can be successful, avoid the soft switch investment. Because these investments can not be completely smooth transition to IMS, there is always some equipment can also play a role though, but do not throw no good, do not throw good. If you do not have the above conditions, soft switching, then we must take into account the smooth transition to the IMS feasibility and long-term coexistence of the problem.

Fixed network operators to replace the current soft-switching PSTN is so urgent? I personally doubt. PSTN is now applied very well, did not say growth may be very large, there is no need to use new technology to replace. Now the problem is that PSTN can not provide more new business, I think that the provision of new services with IMS softswitch more than the advantages. With the maturity of IMS, network and application will do more.

So I think that telecom operators and equipment manufacturers should spend more energy on research and development of the use of IMS.

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