RSRP and RSRQ
Reference Signals Received Power (RSRP) and Reference Signal Received Quality (RSRQ) are key measures of signal level and quality for modern LTE networks. In cellular networks, when a mobile device moves from cell to cell and performs cell selection/reselection and handover, it has to measure the signal strength/quality of the neighbor cells. In the procedure of handover, the LTE specification provides the flexibility of using RSRP, RSRQ, or both.
RSRP – Reference Signal Received Power is an RSSI type of measurement. It is the power of the LTE Reference Signals spread over the full bandwidth and narrowband. A minimum of -20 dB SINR (of the S-Synch channel) is needed to detect RSRP/RSRQ.
RSRQ – Reference Signal Received Quality: Quality considering also RSSI and the number of used Resource Blocks (N) RSRQ = (N * RSRP) / RSSI measured over the same bandwidth. RSRQ is a C/I type of measurement and it indicates the quality of the received reference signal. The RSRQ measurement provides additional information when RSRP is not sufficient to make a reliable handover or cell reselection decision.
|>= -80 dBm||Excellent||Strong signal with maximum data speeds|
|-80 dBm to -90 dBm||Good||Strong signal with good data speeds|
|-90 dBm to -100 dBm||Fair to poor||Reliable data speeds may be attained, but marginal data with drop-outs is possible. When this value gets close to -100, performance will drop drastically|
|<= -100 dBm||No signal||Disnonnection|
|>= -10 dB||Excellent||Strong signal with maximum data speeds|
|-10 dB to -15 dB||Good||Strong signal with good data speeds|
|-15 dB to -20 dB||Fair to poor||Reliable data speeds may be attained, but marginal data with drop-outs is possible. When this value gets close to -20, performance will drop drastically|
|<= -20 dB||No signal||Disconnection|