ROF路-车系统中的切换预留算法性能分析

Performance Analysis of Handover Reservation Scheme for Road Vehicle Communication System in ROF Networks

提出了将切换优先信道预测预留方案应用于ROF路车通信系统以解决信道分配的方案.根据M/M/c排队模型理论,采用数值分析方法,调整车辆运行速度及网络通信负载,得到不同条件下预测区在整个小区中所占比例的最优值,并分析了预测预留方案对越区切换掉话率的改善程度.数值结果表明:该方案不仅适用于车辆运行速度较低、通信负载较大的城市交通系统,而且对通信负载量较大的高速公路通信系统,其越区切换的掉话率也能得到较明显地改善.

Predictive channel reservation （PCR） scheme for handover prioritization is applied in road vehicle communication system, which is based on radio over fiber technique, to solve the problem of the channel allocation. According to the theory of M/M/e queue model, the network traffic load and the speed of vehicles are ajusted by numerical analysis method to obtain the best size of the pre-reservation area under different situations. Also, the improvement of the probability of dropping handovers is anlyzed, which dues to the PCR scheme. The results show that the PCR scheme is not only suitable for urban area with high traffic load and low mobility, but also can significantly reduce the probability of dropping handovers for the freeway system, of which the traffic load is considerably high.