Spectrum occupancy analysis over band GSM 850 on Bogotá
Authors: Juan Carlos Martínez Quintero, José de Jesús Rugeles Uribe, Edith Paola Estupiñan Cuesta
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This paper evidence a channels use analysis and the spectral occupancy measurement for the downlink in Bogota, Colombia, over GSM-850 band. Two test scenarios are defined. First, we select a path of 2.96 Km over North Zone Bogotá to realize the channels search and spectrum detection. The results show parameters like: BSIC, NCC, LAI, MNC, LAC, CI, BCCH channel, uplink frequency, power level received for a mobile telephony operator. Rohde & Schwarz Qualipoc was used to perform the measurements. The Qualipoc equipment found a coverage of 17 cells on the path with a reconnection state in two cells previously identified. After the analysis, we concluded that the GMSK modulation is the most used, reporting stable power level for mobile stations as specified in 3GPP GSM05.05 statement. Finally, the spectrogram measurement indicated the coexistence of different mobile technologies, and the GSM use in several frequency channels and temporal spaces, with 95.2% spectrum occupancy.