基于上下文感知和移动位置预测的切换机制

Handoff Mechanism Based on Context-aware and Mobile Location Prediction

切换机制是无线通信系统中为用户提供无缝移动应用服务的一项关键技术,切换成功与否直接影响着用户业务体验和使用。提出了基于上下文感知和移动位置预测的切换机制,即采用多种类型上下文信息并利用修正证据理论预测移动用户的准确位置。提出的方法能够避免"乒乓切换",缩短切换延迟,提前预留资源,为快速、准确和可靠的切换判决提供依据,显著地改善了网络服务质量。理论分析和仿真结果表明,该方法位置预测更接近用户真实的运动轨迹,位置预测的均方根误差较小,大大提高了切换成功率。

The handoff mechanism is a key technology which can provide user with seamless mobile application services in wireless communication system. It also has very important impact on user oriented service experience and application. In this paper, a context-aware and mobile location prediction based handoff mechanism was proposed, which uses the modified Dempster-Shafer theory together with a variety of context information to predict the location of mobile users. The proposed method can not only efficiently avoid ＂ping-pong＂ handoff, but also shorten handoff delay, and provide basis for fast, accurate and reliable decisions, and reserve resources in advance. Thus, it can significantly improve the QoS （Quality of Service）of network. Theoretical analysis and simulation results show that location prediction is closer to user＇s real trajectory. The RMSE of position is smaller,which means the success rate of handoff is largely improved.