一种新型数据链MAC协议及其信道占用研究

Research on a New Data Link MAC Protocol andits Channel Occupancy

根据Ad Hoc网络中MAC协议对系统性能的影响,针对传统MAC协议的不足,首先研究了一种基于优先级概率统计的多址接入(SPMA)协议,对SPMA协议的运行机制及特点进行详细阐述。然后,提出信道占用率的概念并提出了一种基于收发脉冲的信道占用统计算法。最后,在上述算法的基础上实现SPMA协议对信道的接入控制。仿真结果表明,在无线Ad Hoc网络场景中,基于该统计算法的无反馈MAC协议可以为高优先级业务提供QoS服务保证,即高优先级分组成功概率不低于99%,端到端时延不超过2ms。

According to the impact of MAC protocol in Ad Hoc network on system performance, and for the shortcomings of the traditional MAC protocol, firstly, we studied the statistic priority-based multiple access protocol and explained the operating mechanism and characteristics of SPMA protocoldetailedly. Then, the concept of channel occupancy rate and a channel occupancy statistics algorithm based on pulse-send and receive pulses were proposed. Finally, on the basis of this algorithm, the access control of the channel by the SPMA protocol was implemented. Simulation results show that in the wireless Ad Hoc network scenario, the non-feedback MAC protocol based on the statistical algorithm can provide QoS service guarantee for high-priority services, that is, the probability of success of high -priority packets is not less than 99%, and the end-to-end delay is not more than 2ms.