RxLevAccessMin Parameter is decide to allow mobile to access Network.its also used to reduce access on any BTS.
RxLevAccessMin = Mobile Sensitivity + Body loss + Multipath loss + Interference Margin
Mobile Sensitivity = -104 for GSM900 and -102 for DCS1800
Body loss :
= 3 dB recommended by ETSI and 5 dB for GSM 900 by Various Vendor
= 3 dB recommended by ETSI and 3 dB for DCS 1800 by Various Vendor
Multipath loss = Signal loss from base station due to reflection by buildings, etc before reaching mobile.
Normally the Multipath loss is around 3 dB but can be overcome by Antenna Diversity which has gain around 3 dB too.
(Space diversity = 3 dB, 90 degrees polarized diversity = 3 dB, 45 degrees slant polarized diversity = 4.5 dB)
Interference Margin = Margin allocated to overcome C/I and C/N, the recommended value is 2 dB
RxLevAccessMin = Mobile Sensitivity + Body loss + Multipath loss + Interference Margin
RxLevAccessMin = -104 + 3 + 0 + 2 (for GSM 900 with ETSI standard)
= – 99 dBm
RxLevAccessMin = -104 + 3 + 0 + 2 (for DCS 1800)
= – 99 dBm