Abstract
The International Civil Aviation Organization is currently developing Draft Standards and Recommended Practices for the VHF air/ground (A/G) digital communications system using time division multiple access (TDMA). This system provides up to four time slots that can be configured in a number of ways to meet differing voice and data communications requirements. This paper reports on a simulation of the data communications delay performance with a two-voice, two-data (2V2D) configuration. The simulation includes a model of the media access control layer with priority queuing for air traffic service data communications between ground and airborne stations. Simulation results show that the performance of the digital channel is improved by combining polling with prioritized message queuing. Furthermore, downlink message delays are reduced significantly by balancing the utilization factors of random access slots and interlayer priority queue management.
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