Abstract
In this study, available spectrum parts in GSM900, LTE800, LTE900, GSM1800, LTE1800, UMTS2100 and LTE2600 were determined. The measurement campaigns were performed at 115 different locations in Samsun city center at the most active time of a day using RF Explorer 6G Combo analyzer device. The spectrum utilization rates were determined using energy detection technique (EDT), and average spectrum occupancy technique (ASOT). The thresholds were chosen manually as -40, -45, -50, -55, -60, -65, -70, -75 dBm, and as 10-dB above the noise floor, as recommended by International Telecommunication Union (ITU), and spectrum utilization was evaluated through EDT and ASOT. Obtained results show that at most of the measurement locations spectrum occupancy percentages calculated via EDT and ASOT very close to each other. Based on the results UMTS2100 band showed the highest average spectrum occupancy i.e. 33.91% and the overall average spectrum occupancy rate was found to 22.72%. Additionally, at 50% of the measurement locations occupancy percentage was below 33% for all services. The average occupancy over GSM900 band was between 0,87% - 66.61% according to the predetermined threshold. It was also found that the bands LTE1800 and LTE2600 were mostly occupied for the thresholds below -60 dBm whereas the measured spectrum was mostly vacant for -40 dBm. This led us to infer that there is a great potential for share some of UHF band for cognitive radio applications and future 5G systems.
Highlights
I n order to meet the growing demand for wireless communication systems and applications, operators are pushed to establish new techniques to solve the shortage of radio spectrum resources problem
In order to detect available parts of the spectrum, detailed measurements were conducted within cellular frequency bands, techniques that described in the previous section have been applied
Energy detection and average spectrum occupancy techniques were used for spectrum sensing
Summary
I n order to meet the growing demand for wireless communication systems and applications, operators are pushed to establish new techniques to solve the shortage of radio spectrum resources problem. Available Television White Space (TVWS) spectrums in Samsun were determined in [5] with the aid of measurements conducted within 470 MHz -790 MHz band at 73 different locations. Multi-band and multi-location spectrum measurements campaign conducted in Nigeria in 80-2200 MHz frequency range in [7], and it was shown that the actual spectral occupancy in Nigeria was less than 10.00%. It was evaluated through spectral occupancy measurements conducted in Konya, Turkey from 30 to 3000MHz frequency range that many frequency bands are suitable for CR [8].
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