About Frame Summary (LTE)

The Frame Summary trace shows the EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format., power, modulation format, number of resource blocks occupied, and Radio Network Temporary Identifier (RNTI Radio Network Temporary Identifier) for the channels and signals that are present in the Measurement Interval.

Manual user mappings for downlink users (PDSCH Physical Downlink Shared Channel), uplink users (PUSCH Physical Uplink Shared Channel and PUCCH Physical Uplink Control Channel), and uplink PRACH Physical Random Access Channel and SRS Signaling Reference Signal are specified in the LTE Allocation Editor.

Downlink control channel and signal parameters are specified in the Downlink Control Channel Properties dialog.

Frame Summary shows information for only the data in the Measurement Interval.

Channel	EVM(%rms)	Power (dB)	Mod. Fmt.	Num. RB Resource Block	RNTI	PID
Downlink: C-RS MBSFN-RS Non-alloc PBCH PCFICH PDCCH PDSCH PDSCH_MUST - UserN PHICH PMCH P-RS P-SS S-SS UE-RS Uplink: Non-alloc PRACH -ResourceN PUCCH PUCCH_DMRS PUSCH PUSCH _DMRS PUSCH_SCMA SRS	EVM is the RMS value of error vector magnitudes for the channel. The Report EVM in dB parameter affects the units of this data result. Non-alloc EVM is normalized with respect to the entire LTE Long Term Evolution signal's average power per subcarrier, since dividing by the reference vector's magnitude (0 in this case) would cause the result to be undefined. EVM can be Averaged using RMS (Video), RMS (Video) Exponential, or Continuous Peak Hold averaging.	Power is the per-subcarrier power received at the reference measurement channel, averaged over all the subcarriers belonging to the physical channel. For PDSCH channels, the Power data result also shows the average power for each layer. The Report Relative Power Levels parameter affects the units of this data result. Non-alloc does not show a power value because the power value is normally zero, and even small values would result in a very large negative dB value. This data result can be Averaged using RMS (Video), RMS (Video) Exponential, or Continuous Peak Hold averaging.	Mod. Fmt. is the modulation format of the channel. The modulation format for Non-alloc signals is not shown. When a channel contains more than one modulation format, Mod. Fmt. will show "Mixed" for that channel.	Num. RB shows the number of resource blocks (1 RB x 1 slot) within the Measurement Interval that contain subcarriers belonging to the channel. Num. RB is not shown for Non-alloc signals. When Averaging is enabled, Num. RB shows the total number of resource blocks included in the average for each channel.	RNTI shows the Radio Network Temporary Identifier that a PDSCH transmission is intended for. The RNTI is used to scramble the CRC Cyclic Redundancy Check of PDCCH Physical Downlink Control Channel transmissions so that a UE User Equipment (e.g. cell phone) only needs to decode PDCCH transmissions which have a CRC that can be unscrambled using the RNTIs assigned to the UE. The RNTI column is only visible when RB Auto Detect Mode is set to Decoded PDCCH.	PID shows the Preamble ID of detected active PRACH Resource allocations. This result is auto-detected when parameter Preamble Auto-detect = ON. The PRACH Resource PID results column is only visible when parameter Format > Sync Type is set to PRACH.

Channel

EVM(%rms)

Power (dB)

Mod. Fmt.

Num. RB Resource Block

RNTI

PID

Downlink:

Uplink:

EVM is the RMS value of error vector magnitudes for the channel.

The Report EVM in dB parameter affects the units of this data result.

Non-alloc EVM is normalized with respect to the entire LTE Long Term Evolution signal's average power per subcarrier, since dividing by the reference vector's magnitude (0 in this case) would cause the result to be undefined.

EVM can be Averaged using RMS (Video), RMS (Video) Exponential, or Continuous Peak Hold averaging.

Power is the per-subcarrier power received at the reference measurement channel, averaged over all the subcarriers belonging to the physical channel.

For PDSCH channels, the Power data result also shows the average power for each layer.

The Report Relative Power Levels parameter affects the units of this data result.

Non-alloc does not show a power value because the power value is normally zero, and even small values would result in a very large negative dB value.

This data result can be Averaged using RMS (Video), RMS (Video) Exponential, or Continuous Peak Hold averaging.

Mod. Fmt. is the modulation format of the channel.

The modulation format for Non-alloc signals is not shown.

When a channel contains more than one modulation format, Mod. Fmt. will show "Mixed" for that channel.

Num. RB shows the number of resource blocks (1 RB x 1 slot) within the Measurement Interval that contain subcarriers belonging to the channel.

Num. RB is not shown for Non-alloc signals.

When Averaging is enabled, Num. RB shows the total number of resource blocks included in the average for each channel.

RNTI shows the Radio Network Temporary Identifier that a PDSCH transmission is intended for.

The RNTI is used to scramble the CRC Cyclic Redundancy Check of PDCCH Physical Downlink Control Channel transmissions so that a UE User Equipment (e.g. cell phone) only needs to decode PDCCH transmissions which have a CRC that can be unscrambled using the RNTIs assigned to the UE.

The RNTI column is only visible when RB Auto Detect Mode is set to Decoded PDCCH.

PID shows the Preamble ID of detected active PRACH Resource allocations. This result is auto-detected when parameter Preamble Auto-detect = ON.

The PRACH Resource PID results column is only visible when parameter Format > Sync Type is set to PRACH.

Querying summary table data results programmatically

To programmatically query the Trace Summary Table data results using the Summary() and SummaryUnit() methods in the MeasurementData object.

See the How To Query Summary Table Data Results topic for more information.

Syntax: app.Display.Traces.SelectedItem.DataName = "Demod Frame Summary1";

The indexes of the Frame Summary data values change depending on the uplink/downlink setting and RB Auto Detect settings, as well as which channels are enabled in the Profile tab of the LTE demodulation properties dialog box. Instead of using hardcoded indexes to retrieve the data values, you can use a data result name to query the data value.

The data result names for this summary table are a concatenation of a channel/signal name with the name of a measurement. Below are three tables, the first two tables (uplink and downlink) have the list of channel/signal names and the third has a list of measurement names.

Example

To find the EVM of user 02's downlink data signal, you would query the data result named "PDSCHUser02" + "EVM" = "PDSCHUser02EVM"

To get data specific to a layer, append the layer number to the end of the data result name. For example, when RB Auto Detect is cleared, you can get the PDSCH EVM for user 1 on layer 2 by querying a data result named "PDSCHUser01" + "EVM" + "2" = "PDSCHUser01EVM2".

Uplink Channels/Signals
Channel/Signal Name	Description
RB Auto Detect = selected
PUSCHQPSK PUSCH16QAM PUSCH64QAM	Primary Uplink Shared Channel user allocations (grouped by modulation type)
PUSCHRS	PUSCH Demodulation Reference Signal (PUSCH-DMRS)
PUCCHUser01	Primary Uplink Control Channel
PUCCHRS	Primary Uplink Control Channel Demodulation Reference Signal (PUCCH-DMRS)
SRSUser01	Sounding Reference Signal (SRS)
PRACHUser01	Physical Random Access Channel (PRACH)

RB Auto Detect = cleared
PUSCHUsernn*	Primary Uplink Shared Channel for user nn
PUSCHRSUsernn*	PUSCH Demodulation Reference Signal for user nn
PUCCHUsernn*	Primary Uplink Control Channel for user nn
PUCCHRSUsernn*	Primary Uplink Control Channel Demodulation Reference Signal (PUCCH-DMRS) for user nn
SRSUsernn*	Sounding Reference Signal (SRS) for user nn
PRACHUsernn*	Physical Random Access Channel (PRACH) for user nn

Inactive	Collection of subcarriers that could be allocated to PUSCH or PUCCH but are not.

Downlink Channels/Signals
Channel/Signal Name	Description
PSS	Primary Synchronization Signal
SSS	Secondary Synchronization Signal
PBCH Physical Broadcast Channel	Physical Broadcast Channel
PCFICH Physical Control Format Indicator Channel	Physical Control Format Indicator Channel
PDCCH	Physical Downlink Control Channel
PHICH Physical Hybrid ARQ Indicator Channel	Physical Hybrid ARQ Automatic Repeat Request 1) A distinct unit of data that is carried on an ARQ-enabled connection. Such a unit is assigned a sequence number, and is managed as a distinct entity by the ARQ state machines. Block size is a parameter negotiated during connection establishment. 2) automatic retransmission request - A signal used in digital communications systems used to signal the transmitting device to retransmit a block of data. Indicator Channel
RS	Downlink Cell-specific Reference Signal
PRS	Positioning Reference Signal
MBSFNRS	Multicast/Broadcast Single Frequency Network Reference Signal
PMCH Physical Multicast Channel	Physical Multicast Channel
PDSCHQPSK PDSCH16QAM PDSCH64QAM	Autodetected Primary Downlink Shared Channels (when RB Auto Detect Mode is set to Power Based)
PDSCHUsernn	Primary Downlink Shared Channel user allocations (nn = user allocation number)
PDSCHUsernnUERS	Primary Downlink Shared Channel UE-specific Reference Signal (nn = user allocation number)
Inactive	Non-Alloc signals

Available Measurements
Measurement Name	Description
EVM	Error Vector Magnitude (%rms)
Power	Power of the channel/signal (unitless - ratio in dB of the channel/signal power to the average data subcarrier power)
ModFmt	Modulation format
NumRb	Number of resource blocks containing the channel
RNTI	Radio Network Temporary Identifier for PDSCH allocations.