Air Traffic Management VoIP Plugtests 2

The Single European Sky initiative, aimed at creating a single upper airspace, is in a similar situation to that faced by GSM™ in the early 90’s which sought and succeeded to create a single means of mobile communication.
The ultimate goal is to accelerate the process of providing ATM VoIP products to the market as contributions to the implementation of the future European ATM system from 2010, as defined in the framework of Single European Sky ATM Research (SESAR).

The ATM VoIP Industry needed access to published and validated base specifications for their product development; ANSPs need to be able to measure the maturity of the new technology to be deployed.
This EUROCAE Plugtests™ Interoperability Event on VoIP for ATM (Air Traffic Management) held at the ETSI headquarters in Sophia Antipolis between 25th March and 3rd April 2009 had the scope of progressing onwards from the first Plugtests™ event that covered the simpler Stage 1 interoperability tests held in April 2008 to the more complex Stage 2 interoperability tests that had the scope of performing further mandatory SIP Telephone and Radio interface interoperability tests as defined by the draft EUROCAE ED-139 document in order to verify their correct functionality over a Local Area Network. Following on from the formal approval of EUROCAE Documents (ED) 136, 137 and 138 documents by the EUROCAE council in February 2009, the second Plugtests™ event also had the scope of providing feedback to issues regarding signalling protocol definition, parameter configuration and Air Traffic Service feature functionality defined within ED Telephone and Radio documents that appear to require further clarification in order to make the interworking between systems more robust.


Feedback on Base Specification:
A list of recommendations to be considered for the enhancement of the ED137 Part 1 Radio and ED137 Part 2 Telephone has been produced. These recommendations have been taken into account by the EUROCAE WG67 review team with the scope of enhancing future editions of the document.
Feedback on Maturity of Products:
The results of the multiple interoperability test scenarios achieved by the European (7 Voice Communication System and 4 Ground Radio Station) suppliers have demonstrated a high rate of success:
Interoperability VCS-VCS: 95,7% (423 tests OK for 442 run)
Interoperability VCS-GRS: 95,6% (483 tests OK for 505 run)

These results show that the VoIP call types and the wide range of ATS (Air Traffic Services) features specified by ED 137, supporting the Operational and Technical Requirements defined by ED 136 have been developed and implemented by the main European VCS and Radio Suppliers with a high level of interoperability achieved. This will lead to ATM VoIP VCS and GRS deployment by ANSPs (Air Navigation Service Providers) in the very near future for operational use in the framework of the Single European Sky (SES).

During the event, it was observed that Interoperability was well achieved. In a few cases, however there was conformity issues with the ED and relevant RFCs observed.