Study On Handover Schemes Of Lte Radio Service Based On Context Aware

With the continuous development of network technology,4G LTE technology is maturing and will soon be put into use. With the LTE becoming the most important wireless technology in the network of the next-generation mobile communication system, voice service will still be one of the most significant businesses. LTE has the advantages of high spectrum efficiency, anti-fading, high bandwidth, high capacity, so it is very suitable for carrying the IP-based voice data. Since it will adopt dot deployed measure in the initial deployment of4G networks, so the.communication quality in LTE border will decline significantly, and business continuity does not meet the requirements of the subscribers. The best way to solve this problem is to look for a traditional network as the destination network through handover technology.This article focuses on two research aspect, one is which network is the best one to handover, and the other one is how to implement this approach.Through the analysis of the context aware, we designed a scheme which uses the communication multipath delay parameters in physical layer to perceive the location and surrounding of the terminal. In order to achieve this program, we use a VLSI variable length structure adaptive channel equalizer. This equalizer adapts its own taps orders and coefficients to suit and match with the changing of the environmental information. Plenty of researches show that the tap orders of an equalizer and multi-path delay in a certain environment are closely related. By an associated database of tap orders and the multipath delay, the terminal can intelligently specific its surrounding, thereby achieving the optimization of the network selection for terminal. Based on the above analysis, we propose the optimal network selection model based on BSAEQ context-aware programs.When LTE users need to handover to other networks because of going out of the LTE network, the above-mentioned method can help them select the optimal network. Generally, the optimal network will always be WLAN or 2G/3G mobile communication network. When the destination network is2G/3G network, SRVCC mechanism designed for LTE handover to2G/3G network switching should be applied. This article studies SRVCC mechanism and focuses on the collaborative handover scheme containing not only packet system but also circus system service. Considering the inadequacies of the traditional method of cell reselection and the knowledge of the PS in mobile system core network, we combine the utilization of cell signal strength and the SGSN and come up with a novel cell selection scheme called ES (Evolved S Criteria). According to the deployment phases of LTE networks, we analyze all the possible service switching sub-scenes for improved cell selection scheme and classified them into two:the traditional S criterion (S Criteria) and the ES (Evolved S Criteria) algorithm program. By simulation, we can find that ES algorithm is better than the traditional S criterion when applying a small received signal power. In the last of this article, we conclude the final improved cell selection processes in SRVCC scene.