The Research Of Delay And QoS In Softswitch

With the constant development of the telecommunication service, the new business emerges in an endless stream, the portfolio of the data expands rapidly, in some economic developed countries, the portfolio of the data has already exceeded speech portfolio. New pronunciation compress technology used widely among communication system already, development of the technology of the computer and increase of the interconnection demand of the computer, making the network which exchange the data in groups develop, the new technical revolution represented by Internet is changing the concept and system of traditional telecommunications deeply. The International Telecommunications Union call this kind of network "Next Generation Network"(NGN), which can offer the telecommunication service and is on the basis of dividing into groups, NGN can offer the ability of many kinds of broadband and conveyance technology which is of QoS assurance, its business relevant function and its convey technological phase independence. NGN makes the users insert different business providers freely, and supports the moving in common use. The softswitch technology will be the focus of solutions of the speech communication of next generation network. Though traditional PSTN network can offer the business with the speed of 64kbit/s, the business and control are all finished by the exchanger. Though this kind of technology guarantees that there is fine quality in the pronunciation, it needs longer cycle to the offering of the new business; in the face of the competitive market, it exposes its obvious deficiency. To compare with speech communication, the communication of network which is based on IP has an incredible growth speed; it has a much higher increasing speed than speech communication on the uses of bandwidth, so launch the speech business progressively in IP network in order to lower costs. But the greatest difference between pronunciation transmission and data transmission is the demand of real-time character of pronunciation transmission. How to guarantee the service quality (QoS) is a very complicated problem for speech business. Though the speech business has already no longer taken main share in all communication amounts, it is still the main source of revenue of the service providers. So, QoS has already become the hot question to which the service provider and equipment manufacturer of telecommunication circle at home and abroad all paid close attention. This text proceeds with definition of the next generation network, introduces the background and its characteristic, and the definition of softswitch ,agreement and standard,also introduces the main functions and business offered of softswitch, according to the present domestic and international state of development, analyses the existing problem of QoS of softswitch, and also analyses how the data delivery of softswitch influences QoS. According to the problem of the quality assurance of softswitch, consults PSTN network operation experience, does a large number of discussions in network planning and construction, proposes many kinds of the network's organize scheme, combines with the examples in operation, verify the solution of softswitch in next generation network in further.