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Dual Band ICS Repeater User Manual
signal are at same signal strength.
4. When there is no way to find the GSM signal strength less or equal to the LTE signal
strength at the original donor antenna location, please relocate the donor antenna location.
5. If at the site, there is absolutely no way of finding a location or orientation with lower GSM
signal strength compared to the LTE signal strength or at least equal GSM signal strength
with the LTE signal strength, then the AGC alarm in the repeater would occur, the output
power of the repeater would be insufficient, and EVM would be deteriorated. All these
abnormal phenomena have nothing to do with the repeater; instead, they are caused by the
GSM signal within the repeater amplification LTE band.
1.5 Intra-band Interference Prevention
GSM and LTE systems
If GSM system and the LTE system are being amplified by the repeater within the same band,
the separation guard band between the 3GPP defined LTE bandwidth and the nearest GSM
channel must be at least 200KHz.
Note: The 3GPP defined LTE bandwidths are 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz.
GSM and WCDMA systems
If GSM system and the WCDMA system band are being amplified by the repeater within the
same band, the separation guard band between the effective signal bandwidth of the WCDMA
signal and the nearest the GSM channel must be at least 580KHz
Note: The effective bandwidth of the WCDMA channel is 3.84MHz.
LTE and WCDMA systems
If LTE system and the WCDMA system are being amplified by the repeater within the same
band, there is no separation guard band required between these two bands. But there are
prerequisites, the LTE band bandwidth must be 3GPP defined LTE bandwidth, and the WCDMA
channel bandwidth must be 3GPP defined WCDMA channel bandwidth
Note: The 3GPP defined LTE bandwidths are 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz.
Note
: 3GPP defined WCDMA channel bandwidth is 5MHz, which means 1 channel bandwidth is
5MHz, 2 channels bandwidth is 10MHz, 3 channels bandwidth is 15MHz, 4 channels bandwidth
is 20MHz.
1.6 Restrictions of ICS Repeaters
From the bandwidth perspective