5.
PERFORMANCE INDICATORS
There are various aspects for the assessment of the coverage of LTE Network denoted
here as the performance indicators. These various factors are studied and measured to
verify the coverage scenario in the radio environment for the LTE test network.
5.1.
Link adaptation
Adaptive link modulation is employed to better utilize the current channel quality. This
feature depends upon the Channel Quality Indicator (CQI). UE performs the channel
estimate and reports the eNodeB. UE normally reports back the highest CQI index asso-
ciated with the Modulation Coding Scheme (MCS) for which the DL transport layer
Block Error Rate (BLER) does not exceed 10%. The CQI index is reported between 1
and 15 or a CQI index of 0 if the transport BLER exceeds 10%. [17] The modulation
schemes available are 64-QAM, 16-QAM and QPSK respectively on the decreasing
order of channel quality.
Table 5.1: CQI values and their modulation range
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