VANET中基于约束区域中继的协作通信性能研究

Research on Performance of Cooperative Communication Based on Constrained Area Relay in VANET

研究了协作通信对车载自组织网络(VANET)性能的影响。中继节点参与通信会提高单链路传输的可靠性,然而大多数研究忽略了采取中继节点会扩大通信干扰范围的影响,从而带来的额外干扰也会影响其他链路的通信。为此,通过构建一个菱形的中继节点选择区域来限制增大干扰区域的不利影响,进而提出一种新的评估协作通信性能的方法,并得到中断概率和网络吞吐量的数学表达式。数值分析和仿真结果表明,协作通信能够显著降低通信中断概率,但其对整个网络的吞吐量性能并不总是有效的,合理地设置中继选择区域大小能有效提高网络吞吐量。

The effect of cooperative communication on network performance in wireless vehicular Ad Hoc network （VANET） was studied. Relay involved in the communication can enhance the reliability of the single-link transmission. However,most studies ignored the detrimental effect of the enlarged interference range due to relay transmissions. The enlarged interference range can block the transmission of its neighboring link. we constructed a diamond-shaped relay selection region to restrict the detrimental effect of the enlarged interference range due to relay transmissions, developed a theoretical performance analysis method for cooperation in VANET and obtained the mathematical expression of outage probability and network throughput. Numerical analysis and simulation results show that cooperative communication can significantly reduce the probability of communication outage, but it is not always beneficial for the throughput per- fonnance of the whole network. The size of relay selection region can be set to improve the network throughput.