Network quality parameters
For the UE, LTE network quality mainly depends on three parameters: RSRP, SINR, RSRQ.
RSRP is a reference signal received power, in the range: -44 ~ -140dBm, the better the value.
SINR signal to noise ratio index, in the range: 0 ~ 30, the better the value.
RSRQ reference signal received quality, range: -3 to -19.5, the better the value.
China Mobile testing requirements
Excellent Point: RSRP> -85dBm; SINR> 25
good point: RSRP -85 ~ -95dBm =; SINR : 16-25
midpoint: RSRP = -95 ~ -105dBm; SINR : 11-15
handicap: RSRP = -105 ~ -115dBm; SINR: 3-10
poor point: RSRP <-115dB; SINR <3
RSRP
RSRP (Reference Signal Receiving Power) is the received carrier signal power to the average of all RE Reference Signal in a Symbol.
In LTE RSRP and RxLev 2G, 3G almost, is the network signal strength indicator, is also on the cell phone signal bar is mainly based on RSRP to display.
SINR
SINR, signal to interference plus noise ratio (Signal to Interference plus Noise Ratio) is the ratio of the intensity of the received useful signal intensity of the received interference signals (noise and interference).
Speaking SINR, I would say CQI. CQI (channel quality indication) obtained by measuring the UE, then report to the eNodeB. LTE PDSCH supports three encoding: QPSK, 16QAM, 64QAM. The CQI is an important condition eNodeB judge decided which type of encoding used. Specifically,
1 <= CQI <= 6，采用QPSK
7 <= CQI <= 9, a 16QAM
10 <= CQI <= 16, using 64QAM
SINR CQI and the downlink reference signal is not relevant, and also the sensitivity of the receiver UE concerned. Therefore, in the case of the same RSRP, SINR have a decisive influence on the Internet speed.
RSSI
RSSI (Received Signal Strength Indicator) signal is received at all in this the Symbol (including pilot signal and a data signal, neighboring cell interference signals, noise signals, etc.) the average power.
RSRQ
RSRQ (Reference Signal Receiving Quality) is the ratio of RSRP and RSSI, of course, since both the bandwidth of the measurement is based may be different, to be adjusted by a coefficient, i.e. RSRQ = N * RSRP / RSSI.
UE will encounter the situation of poor channel quality, signal strength may be due to relatively small, SINR may be relatively poor, it may be a combination of both. Therefore, the need to gather accurate information about the SINR or signal strength, so as to timely trigger a handover. Acquiring signal strength measurements performed by RSRP, and for the definition measured RSRQ RSRP / (E-UTRAN Carrier RSSI), the supplementary information can be obtained about the level of interference. Furthermore, RSRP of measurement accuracy can be further improved trigger switch, thereby reducing the number of transmissions of measurement reports, to improve the quality of handover.
Therefore, based on RSRP and E-UTRA carrier RSSI measured on these two parameters, the parameters increase RSRQ, better able to help with the same frequency and inter-frequency switching operation of the LTE network.
