基于协议序列平均分配算法的VANET信道接入机制  

Channel access mechanism based on equally allocation of protocol sequence for VANET

作　　者：徐哲鑫[1] 蔡苓玲 林潇[1] 吴怡[1] 

机构地区：[1]福建师范大学光电与信息工程学院,福建福州350007

出　　处：《通信学报》2016年第4期74-86,共13页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61571128);教育部高等学校博士学科点专项科研(新教师类)基金资助项目(No.20133503120003);福建省自然科学基金资助项目(No.2013J01224);福建省科技厅工业科技计划重点基金资助项目(No.2014H0019)~~

摘　　要：为了提高VANET中节点的吞吐量性能,提出基于协议序列平均分配算法的信道接入机制。在高速公路场景下,规划IEEE 802.11p业务信道与竞争区段的映射,并根据用户保障序列的特性设计帧结构。通过少量反馈确定竞争区段的节点数,并提出循环轮流分配法实现平均意义上非整数个序列的分配。仿真结果证明了理论分析的有效性,在实际路况中均分法与经典方法相比吞吐量性能明显改善,并且节点越稀疏、物理层数据传输速率越高,吞吐量性能提升越明显,同时可保持较低的网络开销和较好的信道接入公平性。In order to improve the throughput performance in VANET, a channel access mechanism based on equally allocation（EA） of protocol sequence was proposed. For highway scenery, the proposed mechanism re-planed the mapping of traffic channel allocation of IEEE 802.11 p to competition zone. In addition, the frame structure was also redesigned according to the characteristic of user irrepressible protocol sequence. A few bits of data were used to find out the number of nodes in the competition zone. Cyclic polling allocation was proposed to allocate the protocol sequences under average meaning. The theoretical throughput expression is derived and proved to be correct by simulation. It is also verified that the throughput of EA is more superior to classical method in a sparser distributed network or a higher PHY data rate. Equally importantly, EA can also keep relative low network overhead and available fairness about channel access of the nodes.

关 键 词：车载自组织网 全球导航卫星系统 平均分配 信道接入 IEEE 802.11p 

分 类 号：TN929.52[电子电信—通信与信息系统]