基于多因素决策的LTE系统HAMF切换算法研究

LTE HAMF Handover Algorithm Research Based on Multi-Factors

摘要: 考虑网络负载，通过最佳无线利用率的概念引入对LTE小区资源及负荷的定量描述。结合小区的信号质量电平，综合评估用户终端的移动性，以及开展业务存在差异化的QCI，提出了一种基于多因素决策的LTE切换算法。从层三滤波入手，通过加权因子解决了将信号质量电平、小区负荷有机组合的问题。对切换迟滞系数进行基于用户速率和QCI的修正，增加切换算法对影响因素的敏感性，从而保证LTE网络能够因为网络状况和用户行为进行更及时的差异化切换。同时，切换算法预留了扩容门限，能够动态添加需要考虑的任何因素，具备良好的扩充性能。

Abstract: Considering the network load, this paper described LTE cell resource status based on cell optimum utilization. Then, combined with signal level, comprehensive assessment of user terminal’s mobility and differentiate QCI during operations, this paper proposed a new LTE handover algorithm based on multi-factor decision called HLMF (Handover Algorithm base on Multi-Factors). Through layer-3 filtering, this algorithm made it possible to unite important factors such as signal level, cell load, etc. HLMF also modified the hysteresis co-efficient according to user mobility and QCI rectification, which improved the sensitivity of algorithm to various factors, and guaranteed the promptness of LTE system handover caused by network conditions and user behaviors. Meanwhile, HLMF reserved expansion threshold, so it could be added any factors to consider and had a good expansion ability.