基于定向天线的移动自组网TDMA协议研究

Research on TDMA Protocol of MANET Based on Directional Antenna

传统的移动自组网大多采用全向天线组网,为提高传输距离、减少时隙冲突、提高时隙利用率,因此在组网过程中引入定向天线。为解决移动自组网中因引入定向天线带来的时隙冲突问题,论文从研究较为成熟的DTRA协议出发,通过在帧结构中增加随机微时隙的方式来减少时隙冲突。为给网络中各节点提供高效、公平的时隙分配策略,论文改进了DTRA协议中的时隙预留过程,提出了基于节点自身缓存队列数分配不同优先级时隙数目的动态时隙分配算法。通过提出的DTDMA协议与DTRA协议进行的对比仿真,验证了提出的DTDMA协议能够有效减少时隙冲突,且协议在保证高优先级节点可多申请数据时隙的前提下,改善了节点接入信道的公平性。

Most traditional MANET adopt omnidirectional antennas,in order to improve transmission distance,reduce slot conflicts and improve slot utilization,directional antenna is introduced in the networking process.To solve the time slot conflict problem caused by directional antenna in MANET,this paper starts from the relatively mature DTRA protocol and adds random micro time slots to the frame structure to reduce the time slot conflicts.In order to provide an efficient and fair slot allocation strategy for each node in the network,this paper improves the time slot reservation process in DTRA protocol,and proposes a dynamic slot allocation algorithm which allocates time slots to nodes with different priorities according to the number of their own cache queues.By comparing the proposed DTDMA protocol with DTRA protocol,it is verified that the proposed DTDMA protocol can effectively reduce slot conflicts,and the protocol can improve the fairness of the access channel on the premise of ensuring that high-priority nodes can apply for more data slots.