The GSMOBA system was presented as the solution to provide GSM connectivity in flights. Several tests concerning the viability of the satellite interface were conducted. In the tests, a real satellite link (Inmarsat) was established and a satellite simulator was used. It was the first time such tests have been performed. With the satellite simulator it was possible to vary the packet error rate (PER), delay and jitter to analyse their impact on the system. It was observed that the delay has no influence on changes in the PER. The jitter could be an increasing factor for the PER, however, for the analyzed values, this was not observed. From the point of view of voice quality the system was evaluated with a subjective test, the Mean Opinion Score, which presented reasonable results: The MOS results have shown that, for a real deployment of the GSMOBA system, the satellite link will not be an impairment since the PER can be maintained at reasonable values (less than 5%). Also it could be identified that the MOS has a direct dependency on the average PER. The GSMOBA system is under European standardization by the European Telecommunications Standards Institute (ETSI) who is responsible to develop a Harmonized Standard (HS) for the GSMOBA system. The HS was approved by public enquiry in November 2007 and is currently on vote. If the vote is successful, the HS will be published by end of April 2008.
GSM onboard aircrafts (GSMOBA): Satellite link tests
GSM an Bord von Flugzeugen (GSMOBA): Satellitenübertragungstest
2008
6 Seiten, 5 Bilder, 3 Tabellen, 10 Quellen
Conference paper
English
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