| With the coming of information era, higher expectations and demands are placed on the mobile communication. Consumers need not only the stable voice communication, but also different modes of the data and multimedia communication. Because of thirst for the new communication services, the improvement of the communication technology and the high development of the mobile communication in domestic market, users have urged the telecommunication companies to develop and invest new mobile communication services. As major technology of the wireless communication, 3G and WLAN are placed in the foreland of the field of Mobil communication. 3G and WLAN own the different technique characteristics and the market position. From the comprehensive factors such as area coverage, rate of transmission, basic service type, roaming, mobile velocity, frontward expand evolution etc, 3G and WLAN compete only in a part of area, most of the time, they complement and convergent with each other as well as develop jointly. The convergence of 3G and WLAN makes the telecommunication companies to obtain wider overlay and higher-speed data deliver, adapt to the continuous increase of the mobile multimedia and other new services, Along with country informationization continue to progress, it is become important step for"Wireless-City"that has been impossible direction. Due to telecom recombined and Wireless-City progress promoted, network construct of 3G and wireless market has presented an unprecedented development of the situation thus, the author has done a Henan Unicom 3G and WLAN integration of the construction program in order to give an aid to the telecommunication operators on the programming and design of 3G network for the future.The 3rd Generation Partner Project(3GPP) puts forward IMS(the IP Multimedia Subsystem) in the NO.5 release of the 3G standard. Based on this technique, this paper makes a systematic research on the key technique and application of 3G and WLAN convergence, and established tightly-coupled interworking solution of 3G and WLAN convergence based on IMS, and according to the development trend of the mobile network currently, Author has done specific programs about that 3G and WLAN networks to carry out the planning and design of the building and the development of specific programs. First of all, this article provides an overview of 3G and WLAN integration of the study of historical development, research and broad prospects. Then study of 3G and WLAN architecture as well as the characteristics,and then elaborated on the core 3G network construction and evolution, and the systematic research about 3G and WLAN with the integration of key technologies. carries on concrete argument on the foundation and fulfillment of converged the 3G and WLAN networks. Finally, the integration of WLAN and 3G network technologies and modes of thought, and the design and planning, established the construction program.. |
