基于令牌的短波地空IP网络接入控制协议

Access control protocol based on token in high frequency ground-to-air IP network

针对空中节点快速移动以及短波地空之间通信成功率较低的特点,在短波令牌协议(high frequency token protocol,HFTP)基础上,运用簇的思想,空中节点通过预约从地面节点获取令牌,设计出适用于短波地空IP网络媒体访问控制(media access control,MAC)层的带预约短波令牌协议(high frequency token protocol with reserve,HFTPR)。详细描述了协议的网络初始化过程、令牌丢失后的恢复机制和网络节点管理方法;提出了空中节点通信质量评分(air node communication quality score,AN-CQS)算法,能在信道质量变差时根据令牌重发次数进行簇切换,保证令牌的接收成功率;利用OPNET平台对协议进行仿真,与其他MAC协议作了不同业务量条件下的性能对比。仿真结果表明,HFTP-R能快速完成网络初始化,提供较好的实时性、较高的网络吞吐量和业务传输成功率,还具有较强的稳健性,可满足网络的组网需求。

Aiming at the characteristic of air node＇s fast movement and low high frequency（ HF） communication success ratio between the air node and ground node,a new high frequency token protocol with reserve（ HFTP-R） for media access control（ MAC） layer of the HF ground-to-air IP network is designed based on high frequency token protocol（ HFTP） and the concept of cluster. The process of network initialization,token recovery mechanism after its lost and the way to manage nodes are described in detail. The AN-CQS（ air node communication quality score） algorithm,which makes it switch to another cluster according to the token lost time when the channel quality gets bad,is put forward at the same time and can ensure the success ratio of receiving token. Finally,the simulation framework of HFTP-R is developed by OPNET and comparison is made with other MAC protocols under different condition of business data. Simulation results show that,HFTP-R can finish network initialization faster,offer better real-time quality,higher network throughput and success ratio of traffic transmitting,and has strong robustness,which meets the requirement.