SINR - Signal to Interference plus Noise Ratio
Signal to Interference plus Noise Ratio (SINR) is measured by UE on Resource Block (RB) basis.
UE computes SINR on each RB, converts it to CQI and reports it to eNodeB where it is used to select the most suitable MCS for user data transmission in particular RB. SINR value defines the MCS to be used for a RB i.e. the number of bits per modulation symbol to be sent i.e. throughput to be achieved for that particular RB as well as the number of RBs to be allocated by eNodeB to user. SINR can be defined as the ratio of the signal power to the summation of the average interference power from the other cells and the background noise.
CQI - Channel Quality Indicator
CQI is a quantized and scaled version of the experienced SINR. The process of adapting MCS depending on current channel conditions is termed as Link Adaptation. If the SINR is good, higher order MCS (e.g. 64QAM) can be selected implying that more bits per modulation symbol can be transmitted and higher throughput can be achieved. If the SINR is poor, lower order MCS (i.e. QPSK) should be selected implying fewer bits per symbol are transmitted which in turn results in lower throughput.
RSRP - Received Signal Received Power
Reference Signal Received Power (RSRP) is a cell-specific signal strength related metric that is used as an input for cell resection and handover decisions. For a particular cell, RSRP is defined as the average power (in Watts) of the Resource Elements (REs) that carry cell-specific Reference Signals (RSs) within the considered bandwidth.
RSRP measurement, normally expressed in dBm, is utilized mainly to make ranking among different candidate cells in accordance with their signal strength. Generally, the reference signals on the first antenna port are used to determine RSRP, however, the reference signals sent on the second port can also be used in addition to the RSs on the first port if UE can detect that they are being transmitted
RSRQ - .Reference Signal Received Quality
Reference Signal Received Quality (RSRQ) measurement is a cell-specific signal quality metric. Similar to the RSRP measurement, this metric is used mainly to provide ranking among different candidate cells in accordance with their signal quality. This metric can be employed as an input in making cell reselection and handover decisions in scenarios (for example) in which the RSRP measurements are not sufficient to make reliable cell-reselection/handover decisions.
It is defined as
RSRQ = ( N.RSRP )/(LTE Carrier RSSI )
where, N is the number of Resource Blocks (RBs) of the LTE carrier Received Signal Strength Indicator (RSSI) measurement bandwidth.
RSSI - Received Signal Strength Indicator
Received Signal Strength Indicator (RSSI) is the linear average of the total received power observed only in OFDM symbols carrying reference symbols by UE from all sources, including co-channel non-serving and serving cells, adjacent channel interference and thermal noise, within the measurement bandwidth over N RBs. RSSI is used as an input to compute the LTE RSRQ measurement discussed above.
Reference- http://airccse.org/journal/jwmn/7415ijwmn09.pdf
Signal to Interference plus Noise Ratio (SINR) is measured by UE on Resource Block (RB) basis.
UE computes SINR on each RB, converts it to CQI and reports it to eNodeB where it is used to select the most suitable MCS for user data transmission in particular RB. SINR value defines the MCS to be used for a RB i.e. the number of bits per modulation symbol to be sent i.e. throughput to be achieved for that particular RB as well as the number of RBs to be allocated by eNodeB to user. SINR can be defined as the ratio of the signal power to the summation of the average interference power from the other cells and the background noise.
CQI - Channel Quality Indicator
CQI is a quantized and scaled version of the experienced SINR. The process of adapting MCS depending on current channel conditions is termed as Link Adaptation. If the SINR is good, higher order MCS (e.g. 64QAM) can be selected implying that more bits per modulation symbol can be transmitted and higher throughput can be achieved. If the SINR is poor, lower order MCS (i.e. QPSK) should be selected implying fewer bits per symbol are transmitted which in turn results in lower throughput.
RSRP - Received Signal Received Power
Reference Signal Received Power (RSRP) is a cell-specific signal strength related metric that is used as an input for cell resection and handover decisions. For a particular cell, RSRP is defined as the average power (in Watts) of the Resource Elements (REs) that carry cell-specific Reference Signals (RSs) within the considered bandwidth.
RSRP measurement, normally expressed in dBm, is utilized mainly to make ranking among different candidate cells in accordance with their signal strength. Generally, the reference signals on the first antenna port are used to determine RSRP, however, the reference signals sent on the second port can also be used in addition to the RSs on the first port if UE can detect that they are being transmitted
RSRQ - .Reference Signal Received Quality
Reference Signal Received Quality (RSRQ) measurement is a cell-specific signal quality metric. Similar to the RSRP measurement, this metric is used mainly to provide ranking among different candidate cells in accordance with their signal quality. This metric can be employed as an input in making cell reselection and handover decisions in scenarios (for example) in which the RSRP measurements are not sufficient to make reliable cell-reselection/handover decisions.
It is defined as
RSRQ = ( N.RSRP )/(LTE Carrier RSSI )
where, N is the number of Resource Blocks (RBs) of the LTE carrier Received Signal Strength Indicator (RSSI) measurement bandwidth.
RSSI - Received Signal Strength Indicator
Received Signal Strength Indicator (RSSI) is the linear average of the total received power observed only in OFDM symbols carrying reference symbols by UE from all sources, including co-channel non-serving and serving cells, adjacent channel interference and thermal noise, within the measurement bandwidth over N RBs. RSSI is used as an input to compute the LTE RSRQ measurement discussed above.
Reference- http://airccse.org/journal/jwmn/7415ijwmn09.pdf
