Drive Test and Optimization Tutorial - I.pdf

Drive Test Tutorial
Part I
represented by :
Osama Ashraf
1

Drive Test Required Tools
Drive Test Measured Radio KPIs and Activities
Drive Test Field Problems and Troubleshooting
Drive Test Optimization and Trails
Outlines
2

Introduction:-
• The Drive Test is used for checking coverage criteria of a cell
site with RF drive test tool. This is where an actual test is
done in a vehicle while on a call in order to test the
network. The data collected by the drive test tool is
analyzed to evaluate various RF parameters of the network.
• The Drive Route and Site Data for the sites to be driven to is
taken from the customer.
• Drive Test LOG File of the specified Drive Route/Site. It is
then saved and the same will be handed over to customer
at the end of the day. DT (drive test) Resources identify
routine field optimization issues like cable swapping, missing
neighbors etc., and rectify the same with the help of the
customer.
3

4

Drive Test Required Tools:-
5
• Laptop.
• GPS NMEA (Global Positioning Device).
• Smart Phones that support LTE like Samsung S20, Sony
Xperia Xz … etc. (Download , Upload large files , ping
test and CSFB test).
• TEMS investigation (Software used to generate logfile).
• Inverter (charger of the laptop and Smart phones).
• TEMS Pocket (for indoor tests).
• Speed test Application (to test Download , Upload and
Ping).
• TEMS Discovery, MapInfo (Analysis Tools).

6

Drive Test Measured Radio KPIs
7
DT measured Radio Parameters:
2G Radio Parameters
Cell Name: Name of the serving cell and neighbor cells
BSIC: Base Station Identity Code BSIC = NCC (Network color
code [0 >7]) + BCC (Base Station Color Code [0 > 7]).
ARFCN: Absolute Radio Frequency Number >> BCCH Carrier of
the cell
Rxlev: Measured signal strength (-10 > -115)
RxQual: Voice quality (0 > 7) depend on BER (bit error rate)
C/I: Carrier to Interference ratio
Rxlev:
RxQual:
C/I:

8
3G Radio Parameters
Cell Name: Name of cells according to loaded cell file.
SC (Scrambling code): Each cell in the network is assigned a
Primary Scrambling Code. (Integer value 0-511) It is important
to avoid CO-UARFCN CO-Scrambling Code use in the same
geographic area.
UARFCN: (UTRA Absolute Radio Frequency Channel Number).
These are used to identify frequencies in the UMTS frequency
bands.
CPICH RSCP: Common Pilot Channel Received Signal Code
Power Received power (dbm) of common pilot channel.
Ec/No: The Primary Common Pilot Channel (CPICH) received
Energy per Chip (Ec) to Noise (No) ratio. Used to measure the
received quality of the Primary Common Pilot Channel (CPICH).
CQI: Channel quality index.
CPICH RSCP:
Ec/No:
CQI:

9
4G Radio Parameters
RSRP: Reference signal received the average power received
from a single Reference signal, and Its typical range is around -
44dbm (good) to -140dbm (bad).
RSRQ: Reference Signal Received Quality Indicates quality of
the received signal, and its range is typically -19.5dB(bad) to -
3dB (good)
RSSI: Represents the entire received power including the
wanted power from the serving cell as well as all co-channel
power and other sources of noise and it is related to the above
parameters
SINR: is the reference value used in the system simulation and
can be defined: Wide band SINR for a specific sub-carriers (or
for a specific resource elements)All measured over the same
bandwidth.
RSRP:
SINR:
CQI:

Drive Test Measured Radio KPIs – 2G
10
• GSM Serving + Neighbors:
In this window you will follow the serving cell that
appearance in first row on this window, neighbors
cells ,BSIC’S(network color code+ base station color code),
for all cells serving and neighbors, BCCH for each cell, RX
Lev for each cell also and C1(cell selection offset) with
C2(cell reselection offset) that appearance in idle mode
test only.

11
• GSM Current Channel:
This window include a lot of important things that related
with your work, time, cell name CGI (MCC, MNC, LAC, CI),
Band, BCCH, TCH’S, BSIC (network color code+ base
station color code), Mode (dedicated, idle or packet) and
time slot when the mobile is dedicate etc…

12
• GSM Radio Parameters: :
Rx lev: Measured signal strength (-10 > -115), Rx Qual:
Voice quality (0 > 7) depend on BER (bit error rate), FER
(Frame Erasure Rate): Percentage of frames being
dropped, BER actual: (Number of bit errors / Number of
bit transmitted), SQI: Speech Quality Index, MS Power
control level: Power control (0 > 8) depend on network
design, DTX: Discontinuous Transmission, TA: Timing
advance (0 > 63) Enable MS to advance its transmission to
compensate the propagation delay 0: 500m 1: 1 K, and so
on and we will show on the sub only.

13
• GSM Hopping:
In this window appearance the all frequency hopping on your
sector (GSM, DCS) with RXLev for each frequency and C/I
(carrier to interference ratio) that in coming from co-channel
interference or adjacent-channel interference, you can know
there is a cross feeder in GSM or DCS from levels that
appearance on this window and cross sector in DCS when
sector is concentric only when you find different in levels
between frequencies between GSM and DCS.

14
• WCDMA Serving/active set + Neighbors :
Use it when act measurements related with 3G to know serving cell and neighbors cells , know SC for
each cell , cell ID for each cell , carrier for each cell (first carrier or second carrier) , EC/NO for each cell,
RSCP for each cell and detected problems.
On this window appearance 4 types that:
SC: idle mode.
AS: dedicated mode.
MN: Monitoring neighbor.
DN: Detected neighbor.

15
• HSDPA/HSUPA Analysis:
You use this window when you act HSDPA measurement; you
look on HS Serving Cell, HS Serving Cell Name, CQI (channel
quality index) and the main parameter you must show it is
DSCH Throughput by kb/s to know the rate this parameter
depend on numbers of E1’s and dual stack in any site.

16
• WCDMA Radio Parameter:
We use this window to show the power of the antenna in 3G
(Tx Power) and UTRA Carrier RSSI.
• WCDMA Serving Cell:
We use this window to know serving Cell SC and Serving DL
UARFCN etc…

17
• WCDMA Speech Quality:
We are using this window when we need check SQI speech
quality index (Voice Quality).

18
• LTE Serving/Neighbor Cell:
We use this window when we act measurement’s for LTE to
know serving + neighbor PCI (Physical Cell Identity), RSRP=RSCP
in 3G, RSRQ=EC/NO in 3G and EARFCN =UARFCN in 3G.
• LTE/WCDMA/GSM Serving Cell Line Chart:
We use this window when we need to check handover from
EUTRAN to UTRAN with dedicated mode (download session).

19
• LTE Serving Cell:
We follow this window to know Cell Identity, Cell Name …etc,
when we make test for 4G.
• LTE Radio Parameter:
We are using this window to check the modulation and UE Tx
power.

20
• LTE Throughput Line Chart:
We use this window when we need to know the physical
throughput in downlink (PDSCH) or in uplink (PUSCH) in 4G.
• LTE Downlink line chart(Chart3):
We are using this window to monitor CQI.

Drive Test Measured Radio KPIs – General
21
• Events:
It includes events that act while you are in the work such as
Call attempt, call established, call end, handover, dropped call,
and blocked call etc….
• Layer 3 massages:
We are using this window to check the modulation and UE Tx
power.

Drive Test Measured Radio KPIs – DT Activities
22
1. New Site Acceptance:
2G Acceptance DT procedures
 In Idle mode, for all sectors the following are checked:
o Each sector is serving with satisfactory level in its expected service area.
o Cell reselection from site to neighbors.
o Cell reselection from neighbors to site.
o Cell reselection between site sectors in a clockwise and anti-clockwise manner.
 In Dedicated mode, for all sectors the following are checked:
o Each sector is serving with satisfactory quality in its expected service area.
o Cell handover from neighbors to site.
o Handover between site sectors in a clockwise and anti-clockwise manner.
o Level difference between the hopping channels should not exceed 15 dbm, otherwise we have a hardware problem
and faulty TRX should be replaced.
 The following tests are also done for every cell in the site:
o Ten voice calls : Blocked and dropped calls.
o An SMS sent and received : To check SMS success
o Logging-on to the internet : To check PDP (Packet Data Protocol)

• In Idle mode, the following are checked:
o Each cell is serving with satisfactory level.
o Cell reselection from site to neighbors.
o Cell reselection from neighbors to site.
• In Dedicated mode, the following are checked:
o Each cell is serving with satisfactory RSCP and Ec/No
o Soft handover between site and neighbors.
• The following tests are also done for each sector.
o Five voice calls (60-30)
o Two terminating calls.
o Three video calls.
o An SMS sent and received to check SMS success.
o IRAT test (Hand over from 3G to 2G).
o Reselection from 2G to 3G.
o Logging-on to the internet.
23

24
 Static Test
o Attach/detach 5 attempts.
o Ping.
o FTP Download & Upload.
o UDP Download & Upload.
o Smart phone browsing
o CSFB MO/MT IDLE.
o CSFB MO/MT CONNECTED.
o IRAT from 4G to 3G.
 Mobility Test (Both tests will be performed simultaneously in the same DT) & check cross
o UL Coverage.
o DL Coverage.

25
LTE Drive test parameters:
1-RSRP: Reference signal received the average power received from a single Reference signal, and Its typical range is around -
44dbm (good) to -140dbm (bad).
2-RSRQ: Reference Signal Received Quality Indicates quality of the received signal, and its range is typically -19.5dB(bad) to -
3dB (good).is defined as the ratio N×RSRP/(E-UTRA carrier RSSI), N is the number of RB’s of the E-UTRA carrier RSSI
measurement bandwidth.
3- RSSI: Represents the entire received power including the wanted power from the serving cell as well as all co-channel
power and other sources of noise and it 4-SINR: is the reference value used in the system simulation and can be defined:
Wide band SINR for a specific sub-carriers (or for a specific resource elements)All measured over the same bandwidth.

26
 Static Test
o Attach/detach
In this test we have to connect/disconnect for 5 times using our UE (USB modem) check add core or not.

27
 Static Test
o Ping (avg. time<35ms): To check end to end connection.(user to destination). Open CMD prompt using RUN command.

28
 Static Test
o Ping (avg. time<35ms): To check end to end connection.(user to destination). Open CMD prompt is used run command.

29
 Static Test
o Upload/Download server: To check maximum & Average rate for cell. For 10MHZ carrier (Download (avg.>55 Mbps)/
Upload (avg.>17 Mbps)

30
 Static Test
o CSFB MO/MT: Mobile data and initiate MOC then CSFB occurs from 4G to 3G and call is established, terminate the call and
wait until the cell reselection occurs to 4G. Repeat the same process by MTC.

31
 Static Test
o IRAT from 4G to 3G: Ensure the UE in “NOT LOCKED” mode with weak 4G signal of respective cell. Now attenuate the UE so
that the UE technology is handed-over to 3G (IRAT HANDOVER OCCURS).

32
2. Cluster Perform:
This test is mainly used to check network accessibility (Blocking) and retainability (quality).
To check Accessibility: Short Calls (Using sequence control) (EX: 30 (call duration) , 10 (duration between calls). Sequence
To check Retainability: Long call (Don’t forget ending the call before the hour and starting new Call).
Ex: Marina cluster

Thanks
represented by :
Osama Ashraf
33

Drive Test and Optimization Tutorial - I.pdf

More Related Content

What's hot (20)

Similar to Drive Test and Optimization Tutorial - I.pdf (20)

Recently uploaded (20)

Drive Test and Optimization Tutorial - I.pdf