On the Effects of Short Data Service-Transport Layer Message Length in QoS Metrics of Tetra Networks

This paper presents the results of a measurement survey on the effects of short data service-transport layer (SDS- TL) message length in QoS metrics of TETRA networks. We developed a novel software measurement platform that runs over the TETRA peripheral equipment interface (PEI), generates SDS-TL traffic, performs measurements and presents statistics of QoS metrics. Measurements were taken for SDS-TL sizes varying from 10 to 190 bytes (excluding the TL header) with an increment of 5 bytes. For each SDS-TL size, 1500 messages were exchanged through the measurement platform between TETRA mobile terminals positioned in different cells. Results obtained include the end- to-end transmission delay (mean and standard deviation) and the percentage of lost SDS-TL versus the message size.