一种支持业务优先级的卫星网络信道动态接入策略

针对远程作战飞机接入卫星信道的业务具有优先级且高优先级业务存在突发性影响信道利用率与吞吐量的问题，提出了一种支持业务优先级的卫星网络信道动态接入策略。该接入策略通过引入认知无线电技术构建频谱池以共享信道，设置高优先级业务透明接入信道的同时通过预留信道保证低优先级业务成功接入信道，未接入信道的业务采用排队模型等待接入。仿真结果表明，该策略能够高效地保证高优先级业务接入信道的成功率，有效降低接入时延；同时较好地减小高优先级业务的突发性对低优先级业务接入的影响，有效地提升了卫星信道的综合利用率，降低了低优先级业务的接入时延，保证了低优先级业务接入卫星网络的吞吐效率。

Dynamic channel access strategy supporting service with priority for satellite communication network

In order to solve the problem of low channel utilization and throughput because of burstiness on high-priority service accessing the satellite channel on account of long-range combat aircraft transmitting different priority service when it accesses satellite channel, the paper proposed a dynamic channel access strategy supporting service with priority for satellite communication network. The access strategy constructed the spectrum pool to share channel through introducing the cognitive radio technology. It set the high-priority service accessing channel freely, meanwhile, it ensured low priority business access the channel successfully through reserving spare channel. When there is some service not accessing channel, the service uses the queuing model for access. The simulation results show that this strategy can effectively guarantee the successful ratio of high-priority service accessing channel, meanwhile, it effectively reduces the access delay. When the access strategy is applied, it can effectively reduce the impact of burstiness on high-priority service accessing the satellite channel , which leads to improving the comprehensive utilization rate of the satellite channel, reducing the access delay of low-priority service and guaranteeing the throughput on low-priority service accessing the satellite network.