一种SPMA协议的动态阈值设置方法

doi:10.19665/j.issn1001-2400.2022.05.005

Abstract

Abstract:

The Statistical Priority-based Multiple Access (SPMA) protocol appears in the TTNT (Tactical targeting network technology) data link,which is an access mode based on random competition.In this protocol,time domain and frequency domain resources are used together,and the upper layer traffic is divided into priority.By comparing the threshold and channel occupation,the channel access status is evaluated and the access behavior of each priority traffic is controlled.However,the fixed threshold setting method in the SPMA protocol cannot flexibly deal with the changes of communication services,resulting in the waste of time-frequency resources and the difficulty in guaranteeing the quality of service of heterogeneous services.Therefore,this paper proposes a dynamic threshold setting method based on the frame successful transmission probability.This method uses the frame successful transmission probability to reflect the real-time load of the network.By comparing the current frame successful transmission probability with the frame successful transmission probability of the highest priority service,it dynamically adjusts the threshold of each priority,so that each priority service can access the channel on demand.In order to maintain the stability of network throughput,on the premise of improving channel utilization,it is ensured that the access delay of high priority services is less than 2ms and the transmission success rate is not less than 99%.

Key words: MAC access protocol, statistical priority-based multiple access, dynamic threshold

CLC Number:

TN919

DING Feng,SHI Yan,ZHAO Xiongwang. Approach to the adjustment of the dynamic threshold of the SPMA protocol[J].Journal of Xidian University, 2022, 49(5): 37-46.

Figures/Tables 15

References 20

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仿真参数	值
网络拓扑范围/(km×km)	10×10
跳频点数	5
发送占空比/%	15
突发长度/bit	120
编码速率	1/3
突发传输速率/(Mbit·s^-1)	40
优先级队列/个	8
各优先级数据帧到达间隔	指数分布
动态调整标准值为ξ	0.99

业务优先级	业务Ⅰ强度/%	业务Ⅱ强度/%
7	12.5	5
6	12.5	10
5	12.5	10
4	12.5	10
3	12.5	10
2	12.5	10
1	12.5	15
0	12.5	30

Approach to the adjustment of the dynamic threshold of the SPMA protocol

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