支持混合业务传输的蜂群无人机自组网多路访问控制协议

A Novel Media Access Control Protocol for Multiple Priority Services in FANETs

针对蜂群无人机自组网多优先级业务并行传输,以及高优先级业务低时延、高可靠的服务质量(QoS)需求,提出一种支持混合业务传输的多路访问控制(MAC)协议。该协议针对混合业务的QoS需求,对最高优先级业务采用多信道随机接入策略,其余优先级采用多信道忙闲接入策略,根据阈值和信道占用度对未超时分组的接入权限实时控制,并通过基于信道忙闲感知的多优先级退避机制,为各优先级业务提供了QoS保障能力。进一步综合运用排队理论、Markov建模、离散Laplace变换推导出了系统各项性能的数学表达式和各优先级业务信道接入阈值。仿真结果表明,该协议在重负载下能够有效保障高优先级业务低时延(<2 ms)、高可靠(> 99%)的QoS需求及稳定的系统容量(> 10 Mbit/s),性能优于区分优先级自适应抖动的多信道MAC协议和基于传输时隙分配和即时访问的混合MAC协议。

A media access control protocol for multiple priority services is proposed for the quality of ser- vice (QoS) demands of multiple priority services parallel transmission and low latency, high reliability of the high priority service in flying ad hoc networks (FANETs). According to the QoS demands for many types of services, the protocol adopts a multi-channel random access strategy for the highest priority traffic and the multi-channel busy/idle access strategy for other priority traffic, so the access authority for different priorities can be availably controlled by the residual life, threshold and channel occupancy rate in real time. A multi priority backoff mechanism based on channel busy/idle sensing is also used in this protocol so that the QoS guarantee can be provided for each priority. The protocol performance expressions and access thresholds are deduced by using queuing theory, Markov model, and discrete Laplace transformation. The simulated result shows that the protocol can effectively guarantee the QoS demand of low latency (<2 ms), high reliability (>99%) and stable system capacity(>10 Mbit/s) under heavy load, and its performance is better than the prioritized adaptive jitter based media access control protocol and the hybrid media access control protocol based on pre-allocation of transmission time slots and random immediate access.