减少无线自组网簇间通信冲突的MAC协议

MAC Protocol for Reducing Inter-cluster Communication Conflict in Wireless Ad Hoc Network

多个无人飞行器编队在执行协同任务时,不但要保证编队间指挥和协同数据的优先传输,还要保证编队内的高速通信。为此,提出一种可减少无线自组网簇间通信冲突的MAC协议。该协议设计优先保证编队间关键数据传输的混合接入机制,编队间的通信均须经过簇首,簇首采用载波侦听多路存取接入方式。编队内可以直接通信,采用时分复用接入方式。对簇首节点分配2个相邻的子时隙,在簇间通信时发送相同的数据。双时隙的使用可以保证当某个簇向其他簇发送数据时,其他簇首的内部通信数据只影响第1个时隙发送的数据,而载波侦听则能使第2个时隙发送的数据不会与其他簇首产生内部通信冲突。仿真结果表明,该协议能有效减小簇内通信对簇间通信产生的干扰。提高通信成功率。

There are two issues should be satisfied when multiple unmanned aircraft groups implementing cooperative task. First, the command and cooperation data should be transmitted preferentially among the groups. Second, the inner group transmission rate should be fast. To solve these problems, a cluster-based MAC protocol Double Slots Hybrid Protocol（DSHP） is presented. The hybrid access protocol DSHP sets the key data transmission among groups as top target. The inter-group communication is processed through cluster head with Carrier Sense Multiple Access（CSMA） access protocol. The nodes in the same group can communicate directly with each other with Time Division Multiple Access（TDMA） access protocol. The cluster head is assigned two successive time slots. The two time slots send the same data during inter-cluster communication. The double slots can make sure that the inner-group data of other Cluster heads only collide with the inter-group data in the first time slot, and the carrier sensing can make sure that the transmitted data in the second time slot won＇t ruined by any inner-group data. Simulation results show that this protocol can prevent the inter-group communication from the interference of inner-group communication and improve the success rate of communication.