The Design And Realization Of Handover Subsystem In UMTS

Mobile communication has already permeated people's work and living. Expecting more and more to mobile communication, people hope to be offered higher speed and more services. Wireless communication technology has made the important break-through, growing from FDMA and TDMA to present CDMA. It makes the transfer rate of the wireless interface improve greatly and has created conditions for satisfying people's request. 3GPPs establish the third generation of the standards of mobile communications. It adopts the core network of services layer separate from control layer and control layer separate from bear layer, and adopts the wireless technology of CDMA. These standards meet the present requisition on mobile communication.Basing on the standards of UMTS that were established by 3GPP and the reality of the communication network, this article studies the design and realization of the handover subsystem in the 3G_MSC_Server. This article introduces the whole UMTS network and expounds 3G_MSC_Server position and function in the network. Then it analyses the purpose of handover, the type of handover, handover strategy and handover performance index. It offers the theory for the design of the handover subsystem. Then it recommends overall design of the handover subsystem in detail, analyses the concrete flow of handover. It puts forward many kinds of design plans on the key place of the flow realization, and chooses the best.During the process of realizing the handover subsystem, this article puts forward the following achievement that innovates: The independent design of the subsystem, reduce the coupling between the handover module and the module of other functions. It is easy to update the module; Putting forward the control flow between handover subsystem and bearer; The signaling reserved strategy; The management of the handover subsystem about channel; The trigger mechanism of messages, etc.