中文摘要：

将IEEE802．11DCF用于双向路车载网络通信将极大地提高车载网络的可实现性，但会面临严重的公平性问题，现有的公平性解决采略无法很好的适用于双向路车载网络，通过仿真分析了双向通信流间距离与公平性的关系，并在不修改802．11协议的基础上，提出了基于功率调整的双向路车载网络公平性解决方法。仿真结果表明，在业务流短时相遇时，采用功率调整的方法进行通信，可以解决两个流竞争公平性问题。

英文摘要：

Expanding application of IEEE 802.11 distributed coordination function （DCF） protocol to vehicle networks（VANETs） will greatly quicken the development of Vehicle networks. However, 802.11 DCF endures severe fairness problem in some scenarios, which would limit it＇s performance in vehicle networks. Most existing fairness solutions aim at long term fairness issue but not the short term fairness problem which is more popular in vehicle network. In this paper we discuss how the distance between two pairs commnicating vehicles affect the short term fairness. By simultaion we validate that the two-way road communication exhibite fairness problem only under two situations. Based on this result, a power adjusting scheme is proposed. The simulation results show that the fairness problem is solved by our power adjusting strategy.