mobile network testing challenges of 5g site testing · 5g nr network architecture options option 3...

► Mobile Network Testing

Arnd Sibila

Technology Marketing MNT

(Peter Busch / MNT Expert)

Rohde & Schwarz

CHALLENGES OF 5G SITE TESTING

Rohde & Schwarz

AGENDA► Technology Overview

Dual connectivity NSA (Sib 2 LTE ….)

SSB, Beams, TDD

► Deployment setups (different antennas)

RRH with detached antenna

Integrated active antenna

► Site acceptance / troubleshooting procedure

► Functional tests

Download/Upload/Speed test

► Spectrum analyzer measurements

OBW – or simple power measurement

SSB in time domain

Separating uplink from downlink with gated trigger

► 5G Site testing solution receiver measurements

Automated Channel Detection (ACD)

List of received cells and beams (PCI, SSB)

LTE anchor cell, RF-Power Scan

► Learnings and Conclusions

2 Challenges of 5G Site TestingDec 2019

5G TECHNOLOGY OVERVIEWDUAL CONNECTIVITY NSA (SIB 2 LTE ….)SSB, BEAMSTIME DIVISION MULTIPLEX (TDD)

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5G NR NETWORK ARCHITECTURE OPTIONSOPTION 3 IS PRIORITY 1 IN 3GPP, FOLLOWED BY OPTION 2

EPC

eNB gNB

MME SGW

Option 3:DC EN: E-UTRA-NR

Data

Control

Option 2: Standalone

NGC

AMF UPF

gNB

eNB is the

Master Node


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NON-STAND ALONE (NSA) MODEOPTION 3


3GPP Rel. 15:

“upperlayerindication”: UE

has entered in 5G coverage

area

System information block

(SIB) 2

LTE

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TIME DIVISION MULTIPLEX (TDD)


UL DL DL DL DLUL UL UL

DEPLOYMENT SETUPS (DIFFERENT ANTENNAS)RRH WITH DETACHED ANTENNAINTEGRATED ACTIVE ANTENNA

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DEPLOYMENT SETUPS RRH WITH SEPARATE ANTENNA


► Installations with separate Antennas allow

conducted measurements.

►Reflection and Distance To Fault (DTF)

measurements, either in cabling or the

antenna, are possible.

► Identification of the specific broken component

(RRH, Cable or Antenna) possible.

►Over The Air (OTA) measurements possible.

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DEPLOYMENT SETUPS INTEGRATED ACTIVE ANTENNA


►Fully integrated installations allow only

Over The Air (OTA) measurements.

► Indication of reflection can be checked

by OSS counter only.

SITE ACCEPTANCE/ TROUBLE SHOOTING PROCEDURE

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SITE ACCEPTANCE / TROUBLE SHOOTING PROCEDURE


Mobile phone

Functional tests PING RTT

Upload

Download

Spectrum

analyzer OTA

measurements Is there a signal?

Are there SSBs?

Is there external

Interference?

Receiver

Signal decoding ACD

Bands

EARFCN -

NR-ARFCN

LTE anchor cell

PCI, SIB2

5G cell

PCI, SSBACD = Automatic Channel Detection

FUNCTIONAL TESTSDOWNLOAD/UPLOAD/SPEED TEST

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FUNCTIONAL TESTSWHAT FOR?

When a 5G site is installed, functional tests verify the correct connection to the network and

the site build integrity

Integrity

Integrity testing usually contain these three tests:

► Ping: Measuring latency (RTT round trip time).

► Download: Measuring throughput of a HTTP download

test.

► Upload: Measuring throughput of a HTTP upload test

Dec 2019 Challenges of 5G Site Testing13

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FUNCTIONAL TESTSREQUIRED EQUIPMENT

► For performing these functional tests, we can use any Android smartphone with R&S

QualiPoc Android application installed.


Android 5G smartphone QualiPoc application & license5G SIM card

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QUALIPOC ANDROID - INTEGRATION LEVELS

15

COTS

COTS (with external

diagnostic port)

Rooted(fully integrated

device with internal

diagnostic port)

COTS: Commercial Off The Shelf

Dec 2019 Challenges of 5G Site Testing

Rohde & Schwarz

► Using a smartphone (COTS) with an open diagnostic port

plus the R&S NRP CompuStick

provides all RF trace information to QualiPoc

Available parameters e.g.

for LTE technology including DL and UL:

MCC/MNC, TAC, Cell Id, eNB/Sector ID

DL EARFCN, PCI, Bandwidth

RSRP, RSRQ and RSSI

CA information

for 5G NR:

RF Band, SSB NR-ARFCN

PCI,

SS-RSRP, SS-RSRQ, SS-SINR

and many more…

QUALIPOC ANDROID – INTEGRATION LEVELSCOTS (WITH EXTERNAL DIAGNOSTIC PORT)


R&S NRP

CompuStick

Power Bank

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FUNCTIONAL TESTSPING

►Ping test on QualiPoc measures

the latency to a defined host.

►It verifies that the connection

from this site to the network is

established.


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FUNCTIONAL TESTSDOWNLOAD TEST

► QualiPoc offers multiple downlink tests.

FTP download

HTTP download (single thread)

Capacity download (FTP or HTTP multiple, parallel threads)

► These tests give high-level confirmation that the downlink of this site is

working and performing as expected.

► Particularly by using the Capacity DL test, the multiple parallel DL

threads will try to squeeze the best possible throughput out of the

network.


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FUNCTIONAL TESTSUPLOAD TEST

► QualiPoc offers multiple uplink tests.

FTP upload

HTTP upload (single thread)

Capacity upload (FTP or HTTP multiple, parallel threads)

► These tests give high-level confirmation that the uplink of this site is

working and performing as expected.

► Particularly by using the Capacity UL test, the multiple parallel UL

threads will try to squeeze the best possible throughput out of the

network.


SPECTRUM ANALYZER OTA MEASUREMENTS

OBW – OR SIMPLE POWER MEASUREMENT

SSB IN THE TIME DOMAIN MASKING UPLINK WITH GATED TRIGGER

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SPECTRUM ANALYZER OTA MEASUREMENTS TEST SET UP


For OTA Measurements with a Spectrum

Analyzer, a directional antenna with line of

sight is necessary.

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SPECTRUM ANALYZER MEASUREMENTSOBW – OR SIMPLE POWER MEASUREMENT

If the functional test fails

to show the expected

results, the first question

is: Is there a 5G signal in

the air? To answer that, a

spectrum analyzer can be

used.

Yellow Trace = Max Hold

Green Trace = Clear/Write


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SPECTRUM ANALYZER MEASUREMENTSOCCUPIED BAND WIDTH (OBW)

Using the Max Hold

function of the spectrum

Analyzer and the OBW

function. The occupied

bandwidth can then be

measured.

Yellow Trace = Max Hold


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SPECTRUM ANALYZER MEASUREMENTSSSB IN TIME DOMAIN

Setting the centre

frequency to the

centre of the SSB

block and switching to

Zero Span, the SSBs

can be seen using a

video trigger.


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SPECTRUM ANALYZER MEASUREMENTSSEPARATING UPLINK FROM DOWNLINK WITH GATED TRIGGER


Trigger Free Run

(Down Link

and Uplink)

Gated Trigger

(only Uplink)

Interference

5G SITE TESTING SOLUTION RECEIVER MEASUREMENTS

AUTOMATED CHANNEL DETECTION (ACD)

TOP N POOL WITH PCI AND SSBLTE ANCHOR CELLRF-POWER SCAN

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5G SITE TESTING SOLUTION RECEIVER MEASUREMENTSTEST SET UP DIAGRAM

For the receiver measurements,

including decoding of PCI/SSBs,

a simple omnidirectional antenna

in sufficient.

The antenna can even be placed

in the bag.

The receiver unit need to have

adequate sensitivity and a special

algorithm to adjust the dynamic

window very fast.


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5G SITE TESTING SOLUTION RECEIVER MEASUREMENTSAUTOMATED CHANNEL DETECTION (ACD)

► Using the Rohde & Schwarz

5G Site Testing Solution,

demodulation and decoding

can be added to the

spectrum measurements.

► Automated Channel

Detection (ACD) is used to

show all LTE and 5G signals.

► Automatic identification of

channel frequency and SSB

position.


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5G SITE TESTING SOLUTION RECEIVER MEASUREMENTSLIST OF RECEIVED CELLS AND BEAM (PCI, SSB)

► By filtering, for example via

Band, PCI, MNC/MCC or

SSB, you can select the

signal of interest and check

the availability of

beams/PCIs, boundaries of

beams/sectors, as well as

side lobes.

► The results will be shown in a

so called Top-N view (list of

received cells and beams,

highest signal in front) or as a

graph in a value over time

chart


5G NR LTE

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5G SITE TESTING SOLUTION RECEIVER MEASUREMENTSLTE ANCHOR CELL


► Key parameter like SS-RSRP

or SS-SINR can be displayed

as graphs, as well.

► In parallel, the LTE anchor

cell is measured with it’s key

parameter.

5G NR

LTE

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LEARNINGS AND CONCLUSION

► To detect the presence of a 5G network, it is necessary to locate the SSB as it is the only

always-on signal

► Functional tests performed by a smartphone-based tool are reflecting very well on whether

the gNB is working properly and about its basic performance.

► Important to verify the SSB index distribution in the field is in accordance with expectation.

► Verification of LTE anchor cell is important in NSA configuration.

► In case the UE is not performing in accordance with expectation, a receiver with decoding

(PCI/SSB) functionality is very important.

► There is not one tool, you should use for everything. A set of instruments,

deployment/situation tailored, seems to be the most efficient, cost effective solution.


► Mobile Network Testing

Thank You

Questions?

www.rohde-schwarz.com/mnt

CHALLENGES OF 5G SITE ACCEPTANCE

mobile network testing challenges of 5g site testing · 5g nr network architecture options option 3...

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