车载异构网络中基于多维属性融合的垂直切换方法

Handoff strategy based on multi-dimensional attributes fusion in vehicle heterogeneous network

针对车辆在异构网络重叠区易发生频繁切换导致通信性能降低的问题,提出车载异构网络中基于多维属性融合的垂直切换方法。通过异构网络的属性参数,选取最优接入网络,并对网络的可切换区进行判决。根据切换区滞留时间,计算切换的时间阈值。建立三维属性融合的垂直切换判决模型,进行异构网络间的垂直切换。数值结果表明,该方法不仅能保证车辆在稳定的通信性能下运行,而且与基于RSSI方法以及多属性加权方法相比,能减少乒乓效应,提高车载通信的服务质量。

When the vehicle moves in the heterogeneous wireless networks, it needs vertical handoffs. However, it is easy for vehicles to handover frequently in the overlap area and thus leading to low communication performance. In order to overcome this problem, a new vertical handoff method with multi-dimensional attributes fusion is proposed. First, through the attribute parameters of the heterogeneous network, the optimal access network is selected, and the switchable area of the optimal access network is determined. And then, based on the switching area retention time, the time threshold of handover is calculated. Finally, a vertical handoff decision of three-dimensional attribute fusion was established to carry out vertical handover between heterogeneous networks. Numerical results show that, in comparison with the algorithm based on received signal strength indication(RSSI) and multi attribute simple additive weighting(MA-SAW), the proposed method can not only ensure that the vehicle operating with stable communication performance, but also effectively reduce the ping-pong effect. Moreover, the quality of service(QoS) of communication is improved.