I wrote some test code to pull some more data out of the device and I'm finding that when the device does manage to see the network it's reporting a good RSRP (-80 to - 70dBm) but a low RSRQ (-16dBm or lower). We are beginning to manufacture the product and our manufacturer is finding they they are unable to get the device to establish a network connection in their facility. It's been certified by Verizon and the FCC with no issues. * In this calculation Antenna Gain, Feeder Loss, Path Loss was not taken into account, you can refer to RSRP tag for details.My company makes a device that utilizes an LTE CatM1 cell module that operates only on B13.

Let’s assume that all RE powers are same like Rx Power (RSRP). Power in each subcarrier: 20000mW / 1200 = 16.66mW (milliWatt)īased on calculation, transmission power for each Resource Element is 16.66mW. 100 PRB and 1200 subcarriers are exist in 20Mhz). N: number of PRB in certain bandwidth (e.g. RSRP (Rx) = Reference Signal Received Power: average received power of reference signal which is carried on Resource Element (RE).

RSSI = Received Signal Strength Indication: total received power in the certain bandwidth including traffic channel power, control channel power, thermal noise and etc… In this example we will see theoretical calculation of RSRQ:

Regarding to the negative value of RSRQ, then let’s have a look following basic calculation: RSRQ value might be used for some scenarios such as cell selection, cell reselection and handover. But, how do we see the RSRQ value as negative in drive-test tools and why do we need RSRQ ? Here the “received signal” is reference signal (RSRP).

Reference Signal Received Quality or with abbreviated version RSRQ is quality of the received signal.

Rsrp rsrq