室内Li-Fi和RF混合网络中接入节点分配方法

针对室内可见光无线通信(Li-Fi)与射频(RF)无线通信混合网络切换即接入节点(AP)分配问题,基于用户位置和用户数量随机改变的动态应用场景,引入依据转换阈值为用户确定服务AP的思想,在考虑交接负载的条件下,提出了动态转换阈值和最小数据率约束两种改进的AP分配方法.仿真实验表明,在相同应用场景下,相比固定阈值的AP分配方法,提出的两种方法在中断概率性能方面分别改善4.66%和8.50%;并且其1%中断数据率分别提高3.21 Mb/s和9.09 Mb/s.此外,仿真分析表明数据率要求和随机生成用户数量上限能够显著地影响系统的中断概率性能.

Access Point Assignment Method for Indoor Li-Fi and RF Hybrid Networks

Access point assignment for indoor Li-Fi and Radio Frequency (RF) hybrid networks is studied. Based on the dynamic application scenario with the movement of users and the changes in the number of users, a conversion threshold is introduced to determine the allocation of APs. Two improved methods of AP allocations, dynamic threshold and minimum data rate constraint, are proposed under the condition of considering the handover overhead. The experimental results show that in the same application scenario, the proposed AP allocation methods improve the outage probability performance by 4.66% and 8.50%, respectively, and improve 1% outage data rate by 3.21 Mb/s and 9.09 Mb/s, respectively, when compared with the AP allocation method with fixed threshold. In addition, the simulation analysis shows that the data rate requirements and the maximum number of randomly generated users can significantly affect the outage probability performance.