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Spectrum Master™ MS2720T Spectrum Analyzer Features

LTE FDD/TDD Measurements (Option 883)

RF Measurements

Channel Spectrum

Channel Power

Occupied Bandwidth

Power vs. Time (TDD only)

Frame View

Sub-Frame View

Total Frame Power

DwPTS Power

Transmit Off Power

Cell ID

Timing Error

ACLR

Spectral Emission Mask

Category A or B (Opt 1)

RF Summary

Modulation Measurements

Power vs. Resource Block (RB)

RB Power (PDSCH)

Active RBs, Utilization %

Channel Power, Cell ID

Constellation

QPSK, 16 QAM, 64 QAM

Modulation Results

Ref Signal Power (RS)

Sync Signal Power (SS)

EVM – rms, peak, max hold

Frequency Error – Hz, ppm

Carrier Frequency

Cell ID

Control Channel Power

Bar Graph or Table View

RS, P-SS, S-SS

PBCH, PCFICH

PHICH, PDCCH (FDD only)

Total Power (Table View)

Modulation Results

Tx Time Alignment (FDD only)

Modulation Summary

Antenna Icons

Detects active antennas (1 or 2)

Over-the-Air Measurements (OTA)

Scanner - six strongest signals

Cell ID (Group, Sector)

S-SS, RSRP, RSRQ, SINR

Dominance

Modulation Results – On/Off

Tx Test

Scanner - three strongest signals

RS Power of MIMO antennas

Cell ID, Average Power

Delta Power (Max-Min)

Graph of Antenna Power

Modulation Results – On/Off

Mapping

On-screen

S-SS, RSRP, RSRQ, or SINR

Pass/Fail (User Editable)

View Pass/Fail Limits

All, RF, Modulation

Available Measurements

Channel Power

Occupied Bandwidth

ACLR

Frequency Error

Carrier Frequency

Dominance

EVM peak, rms

RS Power

SS, P-SS, S-SS Power

PBCH Power

PCFICH Power

Cell, Group, Sector ID

Frame Power

DwPTS Power

Transmit Off Power

Timing Error

LTE FDD/TDD Signal Measurements

The Spectrum Master features three LTE

measurement modes:

• RF Measurements

• Modulation Measurements

• Over-the Air Measurements (OTA)

The goal of these measurements is

to increase data rate and capacity by

accurate power settings, ensuring low

out-of-channel emissions, and good signal

quality. These attributes help to create a

low dropped call rate, a low blocked call

rate, and a good customer experience.

Cell site technicians or RF engineers can

make measurements Over-the-Air (OTA)

to spot-check a transmitter’s coverage

and signal quality without taking the cell

site off-line. When the OTA test results are

ambiguous one can directly connect to the

base station to check the signal quality

and transmitter power.

Adjacent Channel Leakage Ratio (ACLR)

measures how much BTS signal gets into

neighboring RF channels. ACLR checks the

closest (adjacent) and the second closest

(alternate) channels. Poor ACLR can lead

to interference with adjacent carriers

and legal liability. It also can indicate

poor signal quality which leads to low

throughput.

Cell ID (Sector ID, Group ID)

Cell ID indicates which base station is

being measured OTA. The strongest base

station at your current location is selected

for measurement. Wrong values for Cell ID

lead to inability to register. If the cause is

excessive overlapping coverage, it also will

lead to poor EVM and low data rates.

Pass/Fail Test

Set up common test limits, or sets of

limits, for each instrument. Inconsistent

settings between base stations, leads to

inconsistent network behavior.

EVM

High values will create larger areas of

cell-to-cell interference and create lower

data rates near cell edges.

Mapping

On-screen mapping allows field technicians

to quickly determine the downlink

coverage quality in a given geographic

location. Plot S-SS Power, RSRP, RSRQ or

SINR with five user definable thresholds.

All parameters are collected for the

three strongest signals and can be saved

as *.kml and *.mtd (tab delimited)

for importing to third party mapping

programs for further analysis.

Modulation Quality – Power vs. Resource Block

A high utilization of the Resource Blocks would indicate

a cell site in nearing overload and it may be appropri-

ate to start planning for additional capacity.

Modulation Quality – Control Channels

High values will create larger areas of cell-to-cell

interference and create lower data rates near cell

edges. Low values affect in-building coverage.

Over-the-Air Measurements – Tx Test

By looking at the reference signals of MIMO antennas

one can determine if MIMO is working properly. If the

delta power is too large, there is an issue.

Over-the-Air On-screen Mapping

With Map Master™ import map area on instrument

screen to drive test downlink coverage of S-SS Power,

RSRP, RSRQ, or SINR.

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Atomic ACLR-AC Guía para resolver problemas Pagina 13

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