CONCLUSION
AND DISCUSSION
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8.
CONCLUSION AND DISCUSSION
8.1.
Measurement analysis
Analysis of the measurements has been appropriately and sequentially divided into:
• CQI and link adaptation
• RSRP analysis
• RSRQ analysis
• SNR analysis
• Throughput analysis
CQI and link adaptation analysis initially give the radio status of the channel and indi-
cates how the UE has adapted to the channel variation. Interdependence of CQI and
Link adaptation in a closed loop can be seen in the analysis. Variation of CQI with the
varying distance and link adaptation is shown clearly.
RSRP analysis is directly related to the radio signal power in LTE. The reference signal
power measured at UE degrades along with the CQI and modulation order. The loss of
signal power comes from the free space model but not entirely. The other factors affect-
ing the signal loss are diffraction, scattering, slow and fast fading and interference.
RSRP measured has been compared with the theoretical value from link budget to find
the difference in the estimated path loss. The measure of attenuation a signal bears be-
ing associated with the particular cell gives the cell dominance. RSRQ, which gives the
signal quality, has also been studied for both of the bands.
SNR and throughput are important planning parameters for network planners. For a
particular band, the analysis of SNR or SINR gives the measure of effect of noise and
interference to the signal power. The downlink throughput measured has been compared
with the Shannon’s theoretical limits with peak throughputs ranging from 48 Mbps ap-
prox. and 36 Mbps at max. for two sites. Threshold throughput of 1 Mbps has been
maintained in the border of both cells. Cell edge throughput thresholds defined by the
service provider also limits the cell edge SINR. These throughput and SINR limits can
also be considered as the performance border lines in the measurement data. The com-
parison clearly indicates that the coverage radius is almost half for LTE 1800 compared
to LTE 800 in all of the perspectives taken for the analysis.
A comparison of LTE 800 with the UMTS network was also done although limited by
the parameters matched for comparison. RSCP was compared with the RSRP and the
downlink throughputs were also compared.
CONCLUSION AND DISCUSSION
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