The Research On Tracking Area List Management In LTE System

Tracking mobile users while reducing the signaling overhead which is composed of tracking area update overhead and paging overhead is an important aspect of the location management in mobile communication system. The flexibility and automatic reconfiguration are two important characteristics of the LTE system. In order to overcome the defects of the traditional location area management, the new concept of tracking area list is introduced in 3GPP R8, which is composed of a plurality of flexible configuration of tracking area to reduce the signaling overhead for location management. There is need to balance the tracking area update and paging overhead in tracking area list management. The larger the tracking area list is, the less the tracking area update have. At the same time, when the network pages the mobile user which will carry on in the whole tracking area list, it will increase the network paging overhead. Vice versa, the smaller the tracking area list is, the more the tracking area update have. But this will cause tracking area update.so there is need to exploit a kind of optimization strategies to configure tracking area list, which can reduce the network load as much as possible and get better network performance.The thesis focus on the design of tracking area list in LTE system and has finished the following work:First, location management, the LTE system architecture and tracking area update signaling process are introduced. Meanwhile, the research on tracking area list at home and abroad is analyzed.Second, the thesis presents a novelty tracking area list designing method based on the correlation of tracking area. The correlation table of each tracking area from the UE history moving path is established. When the tracking area update message occurs, the network provide the last visit tracking area and the current tracking area in the message. Taking this as the start point, two hop tracking area correlation is used to establish tracking area correlation table. The method can vary with different last access tracking area dynamically allocating tracking area list. Meanwhile, the aspect of paging is also considered.Third, the thesis presents a user movement path accessing scheme which is derived by configuring special tracking area list. When the user moves from one tracking area to another, it will trigger tracking area update request. Then user movement path is collected.Fourth, the method’s algorithm module and core code is finished by using python speech in LTE protocol stack.Fifth, the hardware and software of LTE system is built, then using the Lisbon downtown network data compare one simple and effective tracking area list method ―rule of thumb‖ and currently optimal location area design in 3G ―optimal conventional TA‖ with our method in signaling overhead in a day. The results show that our method in reducing the signaling overhead for location management accordingly raised by 9.8% and 15.2%.