User Guide

11TEMS
™
AUTOMATIC 8.1
SQI
Speech Quality Index also assesses speech quality as perceived by a
mobile station user, and is computed by an algorithm that mimics the prefer-
ences of participants in standardized listening tests. The SQI values are based
on bit error and frame erasure rates and their respective distributions, as well
as handover events, DTX percentage, and the choice of speech codec. SQI is
expressed in the MOS scale. TEMS Automatic also now supports AMR-WB.
C/I measurements
TEMS Automatic can also measure C/I, another important parameter
when assessing radio network performance. C/I is the ratio between the
signal strength of the current serving cell and the signal strength of interfer-
ing signal components. C/I is measured in real time in idle, dedicated, and
packet mode, and can also be measured in frequency hopping networks.
The measured average C/I can be presented for each frequency used, and
this data makes it possible to identify frequencies exposed to high levels of
radio interference.
Frequency scanning
Using the handset, the RTU can perform both GSM and WCDMA scanning.
In GSM scan mode, the handset can scan any channels including BSIC decoding.
In WCDMA scan mode, the handset can perform CPICH scanning on up to 12
carriers (UARFCNs), as well as request layer 3 decoding. It is also possible to
connect an external scanner and have the data uploaded via the RTU.