摘要
在卫星移动通信系统基础上,实现集群通信组呼功能。当前卫星组呼通信采用固定频率方式,组呼成员在一个频率下进行通信,实用性差。针对组呼用户身份转换竞争上行信道的过程,为降低用户碰撞概率,提出一种针对媒体接入控制层(Medium Access Control,MAC)的一键通(Push To Talk,PTT)竞争回退策略,并仿真给出了各优先级的用户的概率曲线。仿真结果表明,竞争策略能够很好地保证优先级高的用户有较大的PTT竞争成功的概率。
In this paper,the group call function of trunked communication is implemented based on mobile satellite communication system. The current satellite group-call communication adopts a fixed frequency mode,and the group-call members communicate in a same frequency,which is not practical. This paper puts forward a fallback strategy for the push-to-talk（ PTT） competitive conflict at medium access control（ MAC） layer to lower conflict probability during a group call,and the simulation is performed to present the probability curve of all priority users. The simulation results show that the competition strategy has higher probability of success in PTT competition.
出处
《无线电工程》
2016年第3期12-14,共3页
Radio Engineering
基金
国家部委基金资助项目
关键词
卫星移动通信
组呼
PTT竞争
mobile satellite communication
group call
PTT competition
