Remote Spectrum Monitor™ MS27201A User Guide : LTE Measurements : LTE Demod Summary and Multi PCI
 
LTE Demod Summary and Multi PCI
LTE demod summary measurements are used for compliance testing of 3GPP LTE networks and can evaluate active antenna systems for dynamic physical layer attributes and received power levels of the transmitted signal.
Remote Spectrum Monitor can analyze a single physical-layer cell or multiple physical-layer cells at one time. The following considerations apply to each measurement.
Single PCI:
Better for conducted measurements, directional antenna measurements, or if only one cell is present.
Only one cell is reported. If multiple cells are present, the analysis may jump to different cells or not analyze any of the cells.
Multi PCI:
Better sync in over the air field conditions.
Multiple Cells can be reported and sorted on various measurement parameters.
LTE demodulation summary views present the same measurement parameters in both frequency division duplex (FDD) and time division duplex (TDD). FDD or TDD duplex type is selected using the SETUP Menu (LTE Demod Summary). This section illustrates several LTE FDD measurements using both single PCI and multi PCI analysis techniques.
LTE Demod Summary View
An example FDD LTE demod summary measurement is shown in Figure: LTE FDD Demod Summary Measurement.
LTE FDD Demod Summary Measurement
1. LTE Analyzer Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the MIMO antenna selection and status, sweep setting, and frequency and bandwidth configuration. See Status Panel (LTE Demod Summary).
2. PCI Summary: This area shows the physical cell ID, including the sector ID, cell group number, frequency error, time offset, and sync status. Sync status can indicate if there is a PSS or SSS failure, a Full Sync, or an Unknown condition. Also noted is the instrument’s reference clock accuracy of Internal, External, or GPS high accuracy (requires GPS).
3. Power Summary: Shows the received power for each of the following:
PBCH: Physical broadcast channel, the main purpose of which is to carry the broadcast master information block.
SS: Synchronization signal is used as a preamble sequence in LTE for synchronization purposes.
RS: Reference signal is used as a pilot subcarrier for channel estimation and tracking in LTE.
RS (0 through 3): Reference signal power of each of the MIMO antennas.
4. EVM Summary: Shows the RMS (%) of the error vectors between the reconstructed ideal signals and the received signals, divided by the RMS value of the ideal signals. The first column lists the average EVM (rms) value and the second column lists the peak measured value for each of the following as they are received:
PBCH (QPSK): Physical broadcast channel, the main purpose of which is to carry the broadcast master information block.
PDSCH (QPSK): Physical downlink shared channel (quadrature phase shift keying).
PDSCH (16-QAM, 64-QAM, 256-QAM): Physical downlink shared channel (quadrature amplitude modulation; 16, 64, and 256 states).
LTE Time Alignment Error (TAE) View
An example LTE time alignment error measurement is shown in Figure: LTE Time Alignment Error Measurement.
LTE Time Alignment Error Measurement 
1. LTE Analyzer Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the MIMO antenna selection and status, sweep setting, and frequency and bandwidth configuration. See Status Panel (LTE Demod Summary).
2. PCI SUMMARY: This area shows the physical cell ID, including the sector ID, cell group number, frequency error, time offset, and sync status. Sync status can indicate if there is a PSS or SSS failure, a Full Sync, or an Unknown condition. Also noted is the instrument’s reference clock accuracy of Internal, External, or GPS high accuracy (requires GPS).
3. Time Alignment Error: Measures the delay between the signals from two antennas at the antenna ports.
4. Power and EVM: Measures the power of the reference and secondary sync signals, and the PBCH peak and RMS EVM. (EVM will only display for specific antenna combinations of {0}, {0,1}, {0,1,2,3}. All other combinations will display a blank EVM value.)
 
LTE Resource Block View
An example LTE resource block measurement is shown in Figure: LTE Resource Block Measurement.
LTE Resource Block Measurement 
1. LTE Analyzer Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the MIMO antenna selection and status, sweep setting, and frequency and bandwidth configuration. See Status Panel (LTE Demod Summary).
2. PCI Summary: This area shows the physical cell ID, including the sector ID, cell group number, frequency error, time offset, and sync status. Sync status can indicate if there is a PSS or SSS failure, a Full Sync, or an Unknown condition. Also noted is the instrument’s reference clock accuracy of Internal, External, or GPS high accuracy (requires GPS).
3. Resource Block: Shows the number of active resource blocks, utilization (%), and the OFDM Symbol Transmit Power (OSTP) in dBm.
4. EVM: Shows the RMS (%) of the error vectors between the reconstructed ideal signals and the received signals, divided by the RMS value of the ideal signals for the average signal, QPSK, 16-QAM, 64-QAM, and 256-QAM.
 
SETUP Menu (LTE Demod Summary)
The SETUP menu is available in MEASURE > MEASUREMENT > Demod Summary > SETUP.
LTE SETUP Menu (LTE Demod Summary Measurement)
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ANTENNA
Sets the MIMO antenna number (0 to 3, or AUTO) to use during a measurement. AUTO will use the antenna with the highest received signal power.
CYCLIC PREFIX
Sets the cyclic prefix (or guard time interval) to Normal, Extended, or Auto. The cyclic prefix is a duplication of a fraction of the symbol end. This setting affects the OFDM symbol sensitivity to time dispersion.
DUPLEX TYPE
Selects either frequency division duplex (FDD) or time division duplex (TDD).
UL/DL CONFIG
Available only in TDD duplex type. Sets the uplink/downlink (UL/DL) configuration, or Frame Format. This selection determines which sub-frames are uplink sub-frames and which are downlink sub-frames, and where the transitions between uplink and downlink sub-frames occur.
CFI
Selects the control format indicator (CFI) which indicates how many OFDM symbols are used for carrying the control channel at each sub-frame. CFI1 uses the first symbol at the sub-frame for PDCCH allocation. CFI2 uses the first and the second symbol for PDCCH. CFI3 uses the first three symbols for PDCCH.
PRESET SETUP
Presets the SETUP menu to default settings.
Status Panel (LTE Demod Summary)
The status panels illustrated in this section are unique to the current analyzer and to the particular measurement and view that is selected.
Figure: Status Panel (LTE Demod Summary Measurement) shows the LTE status panel that covers the LTE demod summary measurements.
Status Panel (LTE Demod Summary Measurement) 
 
MIMO ANTENNAS: Toggles the current MIMO antenna setting between AUTO or to select one of the available antennas. When a single antenna is selected, a blue underscore will appear below the antenna icon. The antenna icon is highlighted green when receiving a signal.
SWEEP: Toggles the current sweep setting between continuously or sweep once.
SWEEP ONCE
When sweep is set to single sweep, SWEEP ONCE updates the measurement display. Data continues to be captured in the background.
CHANNEL BW
Sets the measurement channel bandwidth.
CENTER FREQUENCY
Sets the center frequency of the measurement channel.
FREQ REFERENCE
Indicates the current frequency reference source of Internal, External, or GPS Hi Accuracy (requires GPS). The instrument automatically selects the frequency reference in the following order of priority: external, GPS, then the internal time base.
LTE Multi PCI
The following measurement is set up to display LTE Multi PCI data. The multi PCI displays the measurement results of every detected beam in a single, sortable table with a bar graph of the selected measurement.
LTE Multi PCI
1. LTE Analyzer Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the measurement frequency and band configuration. See Status Panel (LTE Multi PCI).
2. Sort: Sets the selected measurement sort order of Descending or Ascending.
3. Bar Graph Measurement: Selects which measurement is plotted on the bar graph (RSRP, RSRQ, SINR, PCI, SSPower).
4. SETUP Menu: The control channel measurement settings are configured in the SETUP menu. See SETUP Menu (LTE Multi PCI).
5. Table Display: fields show the beam index value of the corresponding physical-layer cell ID.
PCI: These fields show the physical-layer cell ID number. When PCI is selected for the bar graph measurement, the values can be sorted in ascending or descending order by tapping the sort button in the bar graph header.
S-SS (dBm): These fields show the secondary synchronization signal power of the corresponding physical-layer cell ID, measured in dBm. When SSPower is selected for the bar graph measurement, the values can be sorted in ascending or descending order by tapping the sort button in the bar graph header.
RSRP (dBm): These fields show the reference signal received power, the average power of resource elements (RE) that carry cell-specific reference signals (RS) over the entire bandwidth. When RSRP is selected for the bar graph measurement, the values can be sorted in ascending or descending order by tapping the sort button in the bar graph header.
RSRQ (dB): These fields show the reference signal received quality, which provide additional information when RSRP is not sufficient to make a reliable handover or cell reselection decision. RSRQ is the ratio between RSRP and RSSI measured in dB. When RSRQ is selected for the bar graph measurement, the values can be sorted in ascending or descending order by tapping the sort button in the bar graph header.
SINR (dB): These fields show the signal-to-noise and interference ratio of the corresponding physical-layer cell ID, measured in dB. When SINR is selected for the bar graph measurement, the values can be sorted in ascending or descending order by tapping the sort button in the bar graph header.
AVG EVM (%): Shows the dominant cell’s AVG EVM of all of the error vectors between the reconstructed ideal signals and the received signals, divided by the RMS value of the ideal signals.
PEAK EVM (%): Shows the dominant cell’s peak EVM of all of the error vectors between the reconstructed ideal signals and the received signals, divided by the RMS value of the ideal signals.
FREQ ERROR (Hz and PPM): This is the difference between the measured carrier frequency and the specified carrier frequency of the dominant cell. This number is only as accurate as the frequency reference that is used, and is typically only useful with a good external frequency reference or GPS.
DOMINANCE (dB): Dominance is the ratio of the dominant cell’s power for the largest signal to the sum of all other signals found, measured in dB.
6. Bar Graph Display: Shows the selected measurement as a bar graph with the current value at the top of the graph.
SETUP Menu (LTE Multi PCI)
The SETUP menu is available in MEASURE > MEASUREMENT > Multi PCI > SETUP.
LTE SETUP Menu (LTE Multi PCI)
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CYCLIC PREFIX
Sets the cyclic prefix (or guard time interval) to Normal, Extended, or Auto. The cyclic prefix is a duplication of a fraction of the symbol end. This setting affects the OFDM symbol sensitivity to time dispersion.
DUPLEX TYPE
Selects either frequency division duplex (FDD) or time division duplex (TDD).
UL/DL CONFIG
Available only in TDD duplex type. Sets the uplink/downlink (UL/DL) configuration, or Frame Format. This selection determines which sub-frames are uplink sub-frames and which are downlink sub-frames, and where the transitions between uplink and downlink sub-frames occur.
CFI
Selects the control format indicator (CFI) which indicates how many OFDM symbols are used for carrying the control channel at each sub-frame. CFI1 uses the first symbol at the sub-frame for PDCCH allocation. CFI2 uses the first and the second symbol for PDCCH. CFI3 uses the first three symbols for PDCCH.
PRESET SETUP
Presets the SETUP menu to default settings.
Status Panel (LTE Multi PCI)
The status panels illustrated in this section are unique to the current analyzer and to the particular measurement and view that is selected.
Figure: Status Panel (LTE Multi PCI Measurement) shows the LTE status panel that covers the LTE Multi PCI measurements.
Status Panel (LTE Multi PCI Measurement) 
 
SWEEP: Toggles the current sweep setting between continuously or sweep once.
SWEEP ONCE
When sweep is set to single sweep, SWEEP ONCE updates the measurement display. Data continues to be captured in the background.
CHANNEL BW
Sets the measurement channel bandwidth.
CENTER FREQUENCY
Sets the center frequency of the measurement channel.
FREQ REFERENCE
Indicates the current frequency reference source of Internal, External, or GPS Hi Accuracy (requires GPS). The instrument automatically selects the frequency reference in the following order of priority: external, GPS, then the internal time base.