OPNET Based Simulation of Hybrid TDMA Protocol for Helicopters Datalink

doi:10.16182/j.issn1004731x.joss.21-0449

Abstract

Abstract:

For the current time slot allocation problem of the data link, an improved hybrid time slot allocation protocol based on grey relational analysis is proposed and implemented. Through the aggregation of throughput, delay and load of current message buffer by grey relational analysis, the comprehensive evaluation index is obtained, and the time slot is allocated dynamically. The fixed time slot allocation is also adopted to ensure that at least one time slot is available for nodes in the network.Simulation results show that compared with the fixed TDMA(time division multiple access) protocol and the P-TDMA(priority-TDMA) protocol, the proposed protocol not only reduces contention conflicts, but also guarantees a lower delay, a relatively high throughput and a high time slot utilization rate.

Key words: OPNET, Link-16, fixed TDMA (time division multiple access) protocol, mixed time slot allocation protocol, helicopters datalink

CLC Number:

TP391.9

Yanfang Fu, Nan Zhang, Jianing Wei, Shaochun Qu, Ying Lu, Chang Liu. OPNET Based Simulation of Hybrid TDMA Protocol for Helicopters Datalink[J]. Journal of System Simulation, 2022, 34(09): 1933-1940.

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节点	时延/s	吞吐量/(个/s)	缓冲区负载程度
1	2.54	26	0.30
2	2.12	23	0.36
3	2.37	26	0.17
4	1.98	20	0.41
5	2.03	18	0.23
6	2.24	24	0.12
7	1.72	16	0.37
8	1.68	21	0.22
9	1.84	24	0.20
10	2.17	28	0.33

节点	时延/s	吞吐量/(个/s)	缓冲区负载程度
1	1.00	0.83	0.62
2	0.51	0.58	0.82
3	0.80	0.83	0.17
4	0.34	0.33	1.00
5	0.41	0.17	0.38
6	0.65	0.67	0
7	0.05	0	0.86
8	0	0.42	0.34
9	0.19	0.67	0.28
10	0.57	1.00	0.72

节点	时延/s	吞吐量/(个/s)	缓冲区负载程度
1	0.22	0.15	0.12
2	0.11	0.11	0.16
3	0.18	0.15	0.03
4	0.08	0.06	0.19
5	0.09	0.03	0.07
6	0.14	0.12	0
7	0.01	0	0.17
8	0	0.08	0.07
9	0.04	0.12	0.05
10	0.13	0.18	0.14

指标	时延/s	吞吐量/(个/s)	缓冲区负载程度
信息熵H	0.868	0.905	0.889
权重W	0.391	0.281	0.328

节点	评分	节点	评分
1	0.168	6	0.088
2	0.126	7	0.059
3	0.122	8	0.045
4	0.110	9	0.065
5	0.067	10	0.147