We are proud to announce that the new ITU-T Recommendation G.1027 is now in force.

The title of this new Recommendation already explains quite well what it is about: "Quality of service metrics for the assessment of the impact of fixed geographic structures on telephony quality and call stability".

In short, this standard uses existing Speech Quality metrics (currently, POLQA but not restricted to it) and applies it to situations experienced in (typically) rail travel. A fixed geographic object is, mostly, a tunnel but in can also be something else with impact on network coverage, such as a ravine or a noise protection structure.  

G.1027 can be understood as extension to already-existing Rec. G.1034 ("Quality of experience metrics for mobile telephony communication during rail travel "), which came into force in January 2020 and introduced a novel way to predict call stability in rail travel situations.

As a side note: Linking speech quality to call stability is also done in the concept of “soft drops”. This describes the well-known situation where technically the connection is stable but speech quality is so bad that parties agree to end the call. 

With G.1027, the portfolio of spatially resolved QoS in available standards has been further expanded, with more to come for packet-data services with an even broader scope, i.e. “continuity of service” and a framework for network capacity assessment methodologies.

Feel free to contact us directly if you are looking for more information on these topics: wolfgang.balzer@focus-infocom.de

Focus Infocom is a Member of ETSI and Associate Member in ITU-T SG12

ETSI membership ITU Associate