Definitions

Published on 11.10.2005 / Updated on 24.01.2006

MOS	Mean Opinion Score - Audio quality rate of an end-to-end type of communication. Its value is 0 when there is no communication and 5 when the communication is perfect. Values 0 and 5 are only theoretical and thus never appear on the measurements. The data presented refers to average values per call.
Routed calls:	Telephone calls successfully established on the network and between the two relevant ends (?The call reached the called terminal?).
Dropped During the Conversation	Telephone calls successfully established on the network but dropped during the conversational phase.
Normal Termination	Telephone calls successfully established on the network and terminated normally.
Not Routed Calls	Telephone calls not established between the two relevant ends (?The call did not reach the called terminal?).
Dropped Calls:	Calls that were dropped, either in the establishment phase or in the conversational phase.
Call Ending Causes:	Reasons leading to the communications drop.
No Service	Out of service (no signal).
Congestion	Network congestion.
Radio Link Failure	Failure in the Radio link between the mobile terminal and the base station. It may occur when crossing a shadow zone of the relevant network.
Other	Other causes for call dropping.
RSSI Signal Level (dBm)	Received Signal Strength Indication ? Informs on the strength of the signal received at the mobile terminal.
BCCH	Broadcast Control Channel ? Transports information to all mobile terminals (MSs) served by a certain BTS (Base Transceiver Station). It is downlinked and carries several parameters, such as: CI (Cell Identity), LAC (Local Area Code), MCC (Mobile Country Code), MNC (Mobile Network Code), FH (Frequency Hopping) Algorithm.
FTS	Fixed Telephone Service.
PSTN	Public Switched Telephone Network.