The document discusses various parameters used in LTE drive testing including: - RSRP, RSRQ, SINR, RSSI, CQI, PCI, BLER, and throughput which provide information on signal strength, quality, and performance. Phone-based drive testing allows monitoring of these parameters and correlation with data performance. MIMO and handovers between LTE and other technologies can also be evaluated. Key metrics include coverage, capacity, and end-user experience.

1. LTE DRIVE TEST PARAMETERS
RSRP :- Reference signal receive power.
• RSRP (dBm) = RSSI (dBm) -10*log (12*N)
where RSSI = Received Signal Strength Indicator
N: number of RBs across the RSSI is measured and depends on the BW
Significance :
RSRP is the most basic of the UE physical layer measurements and is the linear average power
(in watts) of the downlink reference signals (RS) across the channel bandwidth for the Resource
elements that carry cell specific Reference Signals.
Knowledge of absolute RSRP provides the UE with essential information about the strength of
cells from which path loss can be calculated and used in the algorithms for determining the
optimum power settings for operating the network. Reference signal receive power is used
both in idle and connected states
Range :- -44 to -140 dBm
• RSRP term is used for coverage same as RSCP in 3G
RSRQ :Reference signal receive quality
RSRQ = RSRP / (RSSI / N)
N is the number of resource blocks over which the RSSI is measured
RSSI is wide band power, including intra cell power, interference and noise.
Significance :-
It provides the Indication of Signal Quality . Measuring RSRQ becomes particularly important
near the cell edge when decisions need to be made, regardless of absolute RSRP, to perform a
handover to the next cell. Reference signal receive quality is used only during connected states
Range :- -3 to -19.5 dB
RSRQ term is used for Quality same as Ec/No in 3G.
* SINR :-Signal to Noise Ratio.
SINR = S / I + N
S -- Average Received Signal Power
I -- Average Interference power
N -- Noise Power
Significance : Is a way to measure the Quality of LTE Wireless Connections. As the energy of
signal fades with distance i.e Path Loss due to environmental parameters ( e.g. background
noise , interfering strength of other simultaneous transmission)
RSSI :- Received Signal Strength Indicator.
• RSSI = wideband power = noise + serving cell power + interference power
• RSSI=12*N*RSRP
• RSSI per resource block is measured over 12 resource elements.
N: number of RBs across the RSSI is measured and depends on the BW

2. Based on the above:
RSRP (dBm) = RSSI (dBm) -10*log (12*N)
Significance :– RSRP Is the parameter represents the entire received power
including the wanted power from the serving cell as well as all the co channel
power & other sources of noise
CQI :- Channel Quality Indicator
Range :- 1 to 15
Significance:
CQI is a measurement of the communication quality of wireless channels i.e. it indicates the
downlink mobile radio channel quality as experienced by the UE .CQI can be a value
representing a measure of channel quality for a given channel. Typically, a high value CQI is
indicative of a channel with high quality and vice versa.
CQI is measured in the Dedicated mode only.
CQI depends on the RF conditions.
Better the CQI better the throughput will get and vice versa.
PCI :- Physical Cell Id
Range :- 0 to 503
Significance - PCI used to identify the cell & is used to transmit the data
PCI = PSS + 3*SSS
PSS is Primary Synchronization Signal ( Identifies Cell Id ).
PSS value can be 0, 1 & 2
SSS is Secondary Synchronization Signal ( identifies Cell Id group).
SSS value can be 0 to 167.
BLER :- Block Error Rate
Block Error Ratio is defined as the ratio of the number of erroneous blocks received to
the total number of blocks transmitted
Significance: A simple method by which a UE can choose an appropriate CQI value could
be based on a set of Block Error Rate (BLER) thresholds . The UE would report the CQI
value corresponding to the Modulation Coding Schemes that ensures BLER ≤ 10% based
on the measured received signal quality
BLER is Calculated using Cyclic Redundancy error Checking method
High BLER leads to loss of Peak rates & efficiency
BLER threshold should be low i.e. ≤ 10%
Downlink Throughput
- n E-UTRAN may use a maximum of 2 Tx antennas at the ENodeB and 2 Rx antennas at the UE (
MIMO ).

3. Significance: Target for averaged user throughput per MHz, 3 to 4 times
Release 6 HSDPA i.e Higher user throughput as compared to 3G ( Over 300 Mbps downlink as
compared to 14 Mbps in UMTS)
The supported user throughput should scale with the spectrum bandwidth.
Uplink Throughput
-I n E-UTRAN uses a maximum of a single Tx antenna at the UE and 2 Rx antennas at the E
Node B.
- Greater user throughput should be achievable using multiple Tx
antennas at the UE ( MIMO )
Significance: Target for averaged user throughput per MHz, 2 to 3 times Release 6 Enhanced
Uplink i.e Higher user throughput as compared to 3G (Over 50 Mbps Uplink as
compared to 5.76 Mbps in UMTS).The user throughput should scale with the
spectrum bandwidth provided that the maximum transmit power is also scaled.
Phone-Based Drive Test for LTE
Phone-based drive test systems are useful for evaluating basic network performance and are
essential to characterizing the end-user experience while using the network. Phone-based
systems address the need to verify network settings such as cell selection and re-selection
boundaries and to measure the voice and data application performance in the live network.
Most modern mobile phones chipsets have engineering measurement capabilities built into
them, which were used during the mobile phone’s design process.
These same parameters are exploited in drive test software to provide new value to the RF
engineers rolling out the final network.
With radio resource management taking place in the eNB, suitably instrumented phones can be
used to monitor the performance of the physical layer including modulation schemes, access
procedures, synchronization, and power control.
The same types of parameters are measured for LTE as for other cellular technologies. Beyond
the essential protocol log, which provides visibility of the fundamental interaction with the
network, the initial focus is on RF coverage and quality. Figure 3 identifies the main
measurements that are made. In LTE, these equate to reference signal received power (RSRP)
and reference signal received quality (RSRQ), which are measures of the strength and quality of
reference signals. These two results are the major components of network-based decisions to
keep a UE on its current cell or hand it over to an adjacent cell.
Additional measurements used to assess the link quality include call quality index (CQI) and
block error rates (BLER). While RSRQ is the 3rd Generation Partnership Project (3GPP)-defined
measure of signal-to-noise ratio (S/N), which all mobiles must make and report, many LTE UEs
are also making custom carrier-to-noise ratio (C/N) measurements, which they use internally to
assess channel quality. These additional carrier-to-interference (C/I) measurements are not
reported back to the network, but they are available within the drive test logs and can be used
by RF engineering teams to get extra insight as to how
the mobiles perceive the RF environment.

4. Instrumented phones can also report the measured channel state information (CQI, pre-matrix
indicator [PMI], and rank indicator [RI]) and hybrid automatic repeat request (HARQ) statistics.
The number of resource blocks assigned to a device at a particular time, together with the
modulation and coding scheme applied, can be used to evaluate the eNB scheduler
performance. These types of tests are of particular interest during early stages of deployment
of a new network but also must be monitored as network loading increases and true end-user
traffic patterns establish
One of the most interesting LTE network features to RF optimization engineers is the impact
that multiple input multiple output (MIMO) with spatial multiplexing and antenna diversity
brings to the end-user performance. Drive-test-enabled devices can log the current rank,
number of transmit and receive paths in active use, together with the reported availability of
antennas. They can also individually report the signal strength and quality from each of the
device’s antennas. This information can be correlated with
the measured data application performance to establish the impact MIMO has on network
performance.
Because full MIMO is a feedback system, an instrumented mobile that is part of the active
channel is the only way to evaluate the true impact that this technology can make.
As LTE networks are deployed alongside existing cellular networks, cellular operators are
particularly interested in the efficient use of each network resource and the transition between
the network technologies. Drive testing is used extensively to monitor the handover points
between LTE and legacy technologies. The signal strength, quality, cell ID, and neighbor
information both before and after a handover are analyzed and optimized. The length of time it
takes to complete an initiated handover, success rates, and the end-user data-interruption time
(during the actual transition between technologies) are key performance indicators that are
closely monitored.
End-user data throughput performance and latency are the two key measures of a network’s
optimization. If the network is not achieving the expected data performance, it is important to
be able to analyze the signaling performance and settings at each signaling layer, including the
radio resource control (RRC), radio link control (RLC), and media access control (MAC).
Monitoring the resources allocated to a UE together with the measured network conditions,
available neighbor cells. and power levels will allow troubleshooting and optimization of
network settings

5. Header (computing)
From Wikipedia, the free encyclopedia
In information technology, header refers to supplemental data placed at the beginning of a
block of data being stored or transmitted. In data transmission, the data following the header
are sometimes called the payload or body.
It is vital that header composition follow a clear and unambiguous specification or format, to
allow for parsing.
Examples
•E-mail header: The text (body) is preceded by header lines indicating sender, recipient,
subject, sending time stamp, receiving time stamps of all intermediate and the final mail
transfer agents, and much more. See RFC 5322 for details. Similar headers are used in Usenet
(NNTP) messages, and HTTP headers.
•In a data packet sent via the Internet, the data (payload) are preceded by header information
such as the sender's and the recipient's IP addresses, the protocol governing the format of the
payload and several other formats. The header's format is specified in the Internet Protocol.
•In data packets sent by wireless communication, and in sectors of data stored on magnetic
media, typically the header begins with a syncword to allow the receiver to adapt to analog
amplitude and speed variations and for frame synchronization.
•In graphics file formats, the header might give information about an image's size, resolution,
number of colors, and the like.
•In Archive file formats, the file header might serve as a fingerprint or signature to identify the
specific file format and corresponding software utility.
•In some programming languages (for example C and C++) the functions are declared in header
files.
GSM Interview Question -Answer
1. What is the function of SDCCH & SACCH?

6. Ans. (a) SDCCH---- Slow Dedicated Control Channel.
Function:
a) Location updates
b) SMS
c) Ciphering Initiation
d) Equipment Validation
e) Subscriber authentation
f) Call set up signaling
(b) SACCH---Slow Associated Control Channel.
Function:
(a) Timing advance data
(b) Transmit power control
(c) transmission of signaling data
(d) radio link supervision measurements
2. What are the reasons for Hand Overs?
(Ans) . (a) Signal Strength (RX LEVEL)
(b) Signal Quality (RX Qual)
(c) Power Budget
(d) Timing Advance.
(e) Interference
3. What are the shortcomings in handovers?
a) Call Dropping.
b) Ping- Pong handover
c) Far- Away cell effect
4. What is intelligent hand over?
Ans a) Fuzzy logic
b) Neutral networks
5. What are internal & external hand over?
Ans
1) INTERNAL HANDOVER
a) ( INTER BTS): Transfer between two channels (time slot) in same cell.
b) ( INTRA BSC ( BTS –BTS):
1 . transfer between BTS under control of same Bsc
2 . Measuring the quality of radio connection
3 . Power levels
2). EXTERNAL HANDOVER.
a) INTER BSC (BSC_ BSC):

7. 1. Transfer between BTS under the control of diff BSC
2. BSC TO BSC
3 . NSS to attends the hand over
4. MSC controls.
b) INTER MSC ( MSC- MSC) ----1. transfer between cell under the control of diff MSC
6.What is the frequency Hopping?
• It is defined as sequential change of carrier frequency on the radio link between
mobile & base station.
• Two types of freq hopping: 1. Base band freq hopping.
2. synthesized frequency hopping.
7. Explain the major difference between BBH & SFH?
Ans
• In BBH the number of hopping freq is same as number of TRX.
• In SFH the number of Hoping freq can be in the range of 1 to 63.
8. what are the advantages of Frequency Hopping?
1. Frequency Diversity
2. Interference Averaging
3. increase the network capacity
9. How in frequency hopping there is enhancement of network capacity?
• Freq hopping implement will enable more aggressive freq reuse pattern, that leads to better
spectrum efficiency.
• It can add more transceiver in the existing sites , while maintaing the net work quality/
• Freq hopping compressing the available spectrum to make room for extra capacity
.
10. Define the freq. hopping parameters?
Frequency Hopping Parameters
GSM defines the following set of parameters:
- Mobile Allocation (MA): Set of frequencies the mobile is allowed to hop over.
Maximum of 63 frequencies can be defined in the MA list.
- Hopping Sequence Number (HSN): Determines the hopping order used in the cell. It is
possible to assign 64 different HSNs. Setting HSN = 0 provides cyclic hopping sequence
and HSN = 1 to 63 provide various pseudo-random hopping sequences.
- Mobile Allocation Index Offset (MAIO): Determines inside the hopping sequence,
which frequency the mobile starts do transmit on. The value of MAIO ranges between
0 to (N-1) where N is the number of frequencies defined in the MA list. Presently
MAIO is set on per carrier basis.

8. Motorola has defined an additional parameter, FHI.
Hopping Indicator (FHI): Defines a hopping system, made up by an associated set of
frequencies (MA) to hop over and sequence of hopping (HSN). The value of FHI varies
between 0 to 3. It is possible to define all 4 FHIs in a single cell.
Motorola systemallows to define the hopping systemon a per timeslot basis. So
different hopping configurations are allowed for different timeslots. This is very useful
for interference averaging and to randomize the distribution of errors.
11. What are the effects of freq hopping?
(Ans)
1 Handovers:
2 Call setup:
3 Frame Erasure Rate (FER):
12 .Explain in brief what is FER.
FER= Number of erased blocks total no of blocks *100
It is the right measure of voice quality.
FER is performed on speech& signaling frames
FER: 0 to 4%, GOOD.
4 to 15% , slightly degraded
> than 15%, useless
13. What happens when speech frames discarded in FER?
System will interpolate.
14. What happens when signaling frames discarded in FER?
MS is instructed to resend.
15. What is TCH_ TCH Interference? How it is measured.
• When TCH carries are reused that leads to co-channel interference.
• When TCH carrier have call activity.
• This is measured by delta measurement: 1. BCCH carries are diff
2. TCH carriers of both cell 1& cell2 are same
AFRCN TCH
16. Define the terms?
• BER:The number of erroneous bits received
Total no of bits received.
• RBER: 1. Residual bit error rate
2. It is performed on demodulated speech frames that are not mark corrupt
*BFI : Bad frame indication.
17. Explain the parameters in TEMS POCKET mobile.

9. L BC BS RXLEV
L TC TS TX
C/I RQ FE
TA DSC CHM
RH CiMd
MCC MNC LAC
RA CI
1.
2. Llcell BCCH ARFCN
3.
4.
5.
Logical channel.----- BCCH
Logical channel ----- TCH
-- serving cell BCCH AFRCN.
-- base station identity code.
- recieved signal strength
-- traffic channel
- time slot number.
- transmit power
-- Carrier to interference ratio in db
-- Receive bit error rate
–frame erasure rate.
-- Timing advance

10. --C hannel Mode
-- cell reselction Hystresis
—Ciphering mode
– Routing area code.
—Location area code.
18. Explain the analysis behind RX Qual.?
RX Qual is the basic measure. It reflects the average BER over the certain period of time (0.5s)
RX QUAL done over 104 TDMA frames.
Limitation of RXQUAL: 1. The distributions of bit error over time.
2. Frame erasure
3. Hand over.
19. What are type of interference occur?
1. Co- channel interference.
2. Adj-channel interference.
3. Near end- Far end interference.
20. What is ERLANG?
One ERLANG is one channel occupied continuously for one hour.
1E = 64Kbps.
21. what do you mean by GOS?
It is the probabity of having a call blocked during busiest hour.
Ex GOS=0.05 means one call in 20 will be blocked call during busiest hour because of
insufficient capacity.
22. What are the technique GSM offers which combat Multipath fading?
Channel coding
23. What are control &traffic channels?
CONTROL CHANNEL.:1. BCH
2. CCCH
3. DCCH.

11. TRAFFIC CHANNEL: Half rate
Full rate
EFR == Enhanced full rate.
24. What are BCH, CCH, DCCH channels?
BCH-- 1. BCCH
2 .FCCH
3. SCH
CCCH. --- 1.PCH
2. AGCH
3. RACH
DCCH---- 1.SDCCH.
2. SACCH
3. FACCH
25. What are types of bursts?
Normal Burst
Frequency Correction Burst
Synchronization Burst.
Dummy Burst
Access Burst.
26. What is adjacent channel separation in GSM?
Urban Environment-------- 200khz
Sub Urban Environment ---- 400khz
Open environment ----- 800khz
27. What is the watt to dBm conversions?
Power in dBm = 10 log( watts *100)
0 dBm= 1mili watt
1watt = 30dbm
28. What are the optimizations you have done during Drive Test?
What are samples in gsm?
Which modulation take place in GSM
In one TRU how many frames are there?
What is the value RXLEV of neighboring cell?
What do you mean by VAD?

12. What is BFI, where it is use?
2929. Define the hopping parameters in detail?
The MA is a list of hopping frequencies transmitted to a mobile every time it is assigned to a
hopping physical channel. The MA-list is a subset of the CA list. The MA-list is automatically
generated if the baseband hopping is used. If the network utilises the RF hopping, the MA-lists
have to be generated for each cell by the network planner. The MA-list is able to point to 64 of
the frequencies defined in the CA list. However, the BCCH frequency is also included in the CA
list, so the practical maximum number of frequencies in the MA-list is 63. The frequencies in the
MA-list are required to be in increasing order because of the type of signaling used to transfer
the MA-list.
1.1 Hopping Sequence Number
The Hopping Sequence Number (HSN) indicates which hopping sequence of the 64 available is
selected. The hopping sequence determines the order in which the frequencies in the MA-list
are to be used. The HSNs 1 - 63 are pseudo random sequences used in the random hopping
while the HSN 0 is reserved for a sequential sequence used in the cyclic hopping. The hopping
sequence algorithm takes HSN and FN as an input and the output of the hopping sequence
generation is a Mobile Allocation Index (MAI) which is a number ranging from 0 to the number
of frequencies in the MA-list subtracted by one. The HSN is a cell specific parameter. For the
baseband hopping two HSNs exists. The zero time slots in a BB hopping cell use the HSN1 and
the rest of the time slots follow the HSN2 as presented in Error! Reference source not found..
All the time slots in RF hopping cell follow the HSN1 as presented in Error! Reference source not
found..
1.2 Mobile Allocation Index Offset
When there is more than one TRX in the BTS using the same MA-list the Mobile Allocation Index
Offset (MAIO) is used to ensure that each TRX uses always an unique frequency. Each hopping
TRX is allocated a different MAIO. MAIO is added to MAI when the frequency to be used is
determined from the MA-list. Example of the hopping sequence generation is presented in
Error! Reference source not found.. MAIO and HSN are transmitted to a mobile together with
the MA-list. In Nokia solution the MAIOoffset is a cell specific parameter defining the MAIOTRX for
the first hopping TRX in a cell. The MAIOs for the other hopping TRXs are automatically
allocated according to the MAIOstep -parameter introduced in the following section.
30. What is the effect of frequency hopping in RXQual?
Frequency hopping causes some changes in the RXQUAL distribution. Also, there are some
differences in a way the RXQUAL distribution should be interpreted.
The Frame Erasure Ratio (FER) is a ratio of discarded speech frames compared to all the
received speech frames. A speech frame is generally discarded if after the decoding and error
correction process any of the category 1a bits is found to be changed based on the three parity
bits following them in a speech frame.
FER is a measure of how successfully the speech frame was received after the error
correction process and it is thus a better indication of the subjective speech quality compared
to the RXQUAL which gives an estimate of the link quality in terms of BER. The RXQUAL doesn’t

13. indicate how the bit errors were distributed in a speech frame. The bit error distribution affects
the ability of the channel decoding to correct the errors.
The following table gives an idea of the correlation between RXQUAL and FER and between
subjective speech quality and different FER classes.
31. What is the relation link between RXQUAL& FER?
Table 1. RXQUAL vs. FER comparison according to the laboratory tests.
The relation of downlink FER and RXQUAL was measured during a FH trial. The relation is clearly
different in the hopping case compared to the non-hopping case. The distributions of FER in
each RXQUAL class are presented in Error! Reference source not found. and Error! Reference
source not found.. One clear observation can be made; in the non-hopping case there are
significant amount of samples indicating deteriorated quality (FER>10%) in RXQUAL class 5
while in the hopping case the significant quality deterioration (FER>10%) happens in RXQUAL
class 6. Thus, it may be concluded that in the frequency hopping networks significant quality
deterioration starts at RXQUAL class 6 while in non-hopping network this happens at RXQUAL
class 5.
This improvement of FER means that the higher RXQUAL values may be allowed in a frequency
hopping network. RXQUAL thresholds are used in the handover and power control decisions.
Because of the improvement in the relative reception performance on the RXQUAL classes 4-6,
the RXQUAL thresholds affecting handover and power control decisions should be set higher in
a network using frequency hopping network. In a frequency hopping network RXQUAL classes
0-5 are indicating good quality.

14. Typically, the share of the RXQUAL classes 6 and 7 may increase after FH is switched on, even if
no other changes have been made. This may seem to be surprising since it is expected that
frequency hopping improves the network quality. However, in most cases the quality is actually
improved, but the improvement is more visible in the call success ratio. The improved tolerance
against interference and low field strength in FH network means that it is less likely that the
decoding of SACCH frames fails causing increment in the radio link timeout counter. Thus, it is
less likely that a call is dropped because of the radio link timeout. Instead, the calls generating
high RXQUAL samples tend to stay on. This may lead to increase in the share of RXQUAL 6-7.
However, at the same time the call success rate is significantly improved.
In the Error! Reference source not found., there are presented some trial results of a DL
RXQUAL distribution with different frequency allocation reuse patterns. As can be seen from
the figures, the tighter the reuse becomes, the less samples fall in quality class 0 and more
samples fall in quality classes 1-6. There’s bigger difference in downlink than in uplink direction.
This difference is a consequence of interference and frequency diversities that affect the
frequency hopping network. Because of these effects, the interference or low signal strength
tend to occur randomly, while in a non-hopping network it is probable that interference or low
field strength will affect several consecutive bursts making it harder for the error correction to
actually correct errors. The successful error correction leads to less erased frames and thus
improves the FER.
32. What do you understand by idle channel measurement?
When a new call is established or a handover is performed, the BSC selects the TRX
and the time slot for the traffic channel based on the idle channel interference measurements.
The frequency hopping has a significant effect on the idle channel interference measurement
results.
When the frequency hopping is used, the frequency of a hopping logical channel is changed
about 217 times in a second. The frequency of the idle time slots changes according to the
same sequence.
In a case of the random hopping, this means that the measured idle channel interference is
likely to be the same for all the TRXs that use the same MA-list. If the interference is averaged
over more than one SACCH frame, the averaging effect is even stronger. However, normally the
interferers are mobiles located in interfering cells. In this case, there are probably differences in
the measured idle channel interferences between different time slots in the cell. This happens,
because the interfering mobiles are only transmitting during the time slot that has been
allocated to them. This is illustrated in Figure Error! No text of specified style in document.-1.
If the cyclic hopping sequence is used, there might occur differences on the measured idle
channel interference levels between the TRXs on the same time slot as explained in the
following section.

15. Figure Error! No text of specified style in document.-1. Idle channel interference in a case of the
random RF hopping
33 .what are types of handover?
There are four different types of handover in the GSM system, which involve transferring a call
between:
Channels (time slots) in the same cell
Cells (Base Transceiver Stations) under the control of the same Base Station
Controller (BSC),
Cells under the control of different BSCs, but belonging to the same Mobile
services Switching Center (MSC), and
Cells under the control of different MSCs.
34. what are important parameter of power saving in GSM
Discontinuous transmission
Minimizing co-channel interference is a goal in any cellular system, since it allows better service
for a given cell size, or the use of smaller cells, thus increasing the overall capacity of the
system. Discontinuous transmission (DTX) is a method that takes advantage of the fact that a
person speaks less that 40 percent of the time in normal conversation [22], by turning the
transmitter off during silence periods. An added benefit of DTX is that power is conserved at
the mobile unit.
The most important component of DTX is, of course, Voice Activity Detection. It must
distinguish between voice and noise inputs, a task that is not as trivial as it appears, considering
background noise. If a voice signal is misinterpreted as noise, the transmitter is turned off and a
very annoying effect called clipping is heard at the receiving end. If, on the other hand, noise is
misinterpreted as a voice signal too often, the efficiency of DTX is dramatically decreased.
Another factor to consider is that when the transmitter is turned off, there is total silence heard
at the receiving end, due to the digital nature of GSM. To assure the receiver that the
connection is not dead, comfort noise is created at the receiving end by trying to match the
characteristics of the transmitting end's background noise.
Discontinuous reception
Another method used to conserve power at the mobile station is discontinuous reception. The
paging channel, used by the base station to signal an incoming call, is structured into sub-
channels. Each mobile station needs to listen only to its own sub-channel. In the time between
successive paging sub-channels, the mobile can go into sleep mode, when almost no power is
used.
All of this increases battery life considerably when compared to analog
: What is Tri-band and Dual-band?
A: A tri-band phone operates at three supported frequencies, such as 900/1800/1900 MHz or
850/1800/1900 MHz. A dual-band phone operates at two frequencies, such as 850/1900 MHz
or 900/1800

16. RF Optimization and Log File Analysis in GSM
Optimization and Log File Analysis in GSM
1. INTRODUCTION
Every Network needs to be under continues control to maintain/improve the
performance. Optimization is basically the only way to keep track of the network by
looking deep into statistics and collecting/analyzing drive test data. It is keeping an eye
on its growth and modifying it for the future capacity enhancements. It also helps
operation and maintenance for troubleshooting purposes.
Successful Optimization requires:
• Recognition and understanding of common reasons for call failure
• Capture of RF and digital parameters of the call prior to drop
• Analysis of call flow, checking messages on both forward and reverse
links to establish “what happened”, where, and why.
Optimization will be more effective and successful if you are aware of what you are
doing. The point is that you should now where to start, what to do and how to do.
1.1. Purpose and Scope of Optimization
The optimization is to intend providing the best network quality using available
spectrum as efficiently as possible. The scope will consist all below;
• Finding and correcting any existing problems after site implementation and
integration.
• Meeting the network quality criteria agreed in the contract.
• Optimization will be continuous and iterative process of improving overall
network quality.
• Optimization can not reduce the performance of the rest of the network.
• Area of interest is divided in smaller areas called clusters to make optimization
and follow up processes easier to handle.
1.2. Optimization Process
Optimization process can be explained by below step by step description:
1.2.1. Problem Analysis
Analyzing performance retrieve tool reports and statistics for the worst
performing BSCs and/or Sites
Viewing ARQ Reports for BSC/Site performance trends
Examining Planning tool Coverage predictions
Analyzing previous drive test data
Discussions with local engineers to prioritize problems
Checking Customer Complaints reported to local engineers
1.2.2. Checks Prior to Action

17. Cluster definitions by investigating BSC borders, main cities, freeways,
major roads
Investigating customer distribution, customer habits (voice/data usage)
Running specific traces on Network to categorize problems
Checking trouble ticket history for previous problems
Checking any fault reports to limit possible hardware problems prior to
test
1.2.3. Drive Testing
Preparing Action Plan
Defining drive test routes
6
Collecting RSSI Log files
Scanning frequency spectrum for possible interference sources
Re–driving questionable data
1.2.4. Subjects to Investigate
Non–working sites/sectors or TRXs
In–active Radio network features like frequency hopping
Disabled GPRS
Overshooting sites – coverage overlaps
Coverage holes
C/I, C/A analysis
High Interference Spots
Drop Calls
Capacity Problems
Other Interference Sources
Missing Neighbors
One–way neighbors
Ping–Pong Handovers
Not happening handovers
Accessibility and Retainability of the Network
Equipment Performance
Faulty Installations
7
1.2.5. After the Test
Post processing of data
Plotting RX Level and Quality Information for overall picture of the driven
area
Initial Discussions on drive test with Local engineers
Reporting urgent problems for immediate action
Analyzing Network feature performance after new implementations
Transferring comments on parameter implementations after new changes
1.2.6. Recommendations
Defining missing neighbor relations
Proposing new sites or sector additions with Before & After coverage plots

18. Proposing antenna azimuth changes
Proposing antenna tilt changes
Proposing antenna type changes
BTS Equipment/Filter change
Re–tuning of interfered frequencies
BSIC changes
Adjusting Handover margins (Power Budget, Level, Quality, Umbrella
HOs)
Adjusting accessibility parameters (RX Lev Acc Min, etc..)
Changing power parameters
Attenuation Adds/Removals
MHA/TMA adds
8
1.2.7. Tracking
Re–driving areas after implementing recommendations
Create a tracking file to follow–up implementation of recommendations
1.2.8. Other Optimization Topics
Verifying performance of new sites
Verifying handovers
Verifying data after Re–Homes
Investigating GPRS performance
Verifying Sectorizations
Collecting DTI Scan files
Verifying coverage
Verifying propagation model by importing DTI scan files to Planet
Periodic Consistency Checks
Frequency Planning Check
Analyzing cell access parameters
Analyzing Handover parameters
Analyzing Power control parameters
Analyzing Frequency Hopping parameters (HSN, MAIO)
Implementing/analyzing optional features
Keep helping local engineers with emergency cases
Benchmarking
9
1.3. Before Starting
This document was prepared with TEMS screen shots from live examples of previous
experiences to guide RF Engineers on how to define/analyze problems or cases and optimize
network. After each case/problem demonstration, specific step to be taken will be defined and
appropriate recommendation will be given.
The document will be focusing on Drive Testing part of the Optimization Process and give
definitions on basic GSM principals, features and parameters when needed.
The readers of this document are considered to have basic knowledge of cell planning and
TEMS

19. Investigation usage. Only little information will be given just to remember TEMS interface.
10
2. DRIVE TESTING
Drive testing is the most common and maybe the best way to analyze Network performance by
means of coverage evaluation, systemavailability, network capacity, network retainibility and
call quality. Although it gives idea only on downlink side of the process, it provides huge
perspective to the service provider about what’s happening with a subscriber point of view.
The drive testing is basically collecting measurement data with a TEMS phone, but the main
concern is the analysis and evaluation part that is done after completition of the test.
Remember
that you are always asked to perform a drive test for not only showing the problems, but also
explaining them and providing useful recommendations to correct them. Please note that a
successful analysis should be supported by handling of network statistics from a statistics tool
(Metrica/NetDoc–NMS/SRP–OSS, etc..) and careful evaluation of coverage predictions from a
cell planning tool (Planet, DB–Planner, TEMs Cell Planner, etc..). Please see Figure 1 for a usual
view from TEMS.
Dharmendra Kumar Singh
Email id:hidharmendrasingh@gmail.com
Mobile No: *************
Passport No: ********
0BJECTIVES
To work in high engineering & skilled environment with positive attitude, seeking assignments
in Project management / Networking / Telecom with an organization of repute in the Telecom
sector, to hold a position of responsibility in an organization with an opportunity of growth of
the organization along with having a long-term relationship and to conduct myself in such a
manner so as to uphold the dignity of profession.
PR0FESSI0NAL SYN0PSIS
Presently 2G / 3G / RF/Telecom Consultant/Corporate Telecom Trainer in United Telecom
Limited (UTL Technologies Limited) since July 2012 to Till Date. Ability to perform quality work
within deadlines with or without direct supervision and always work with confidence and hard
work. Excellent written and oral communications, interpersonal, analytical, abstract reasoning
and organizational skills. Extensive knowledge of 2G,3G & Strong knowledge on RF Engineering
EMPL0YMENT RECITAL
United telecom Ltd Associate Telecom
Consultant
July 2012 to Till Date

20. Teleysia Network Pvt. Ltd. RF PR0JECT C0-
0RDINAT0R
Jan 2012- June 2012
Metrotel Works (Akrosh) Pvt Ltd SR.RF ENGINEER DEC 2010-Dec-2011
Metrotel (Akrosh Consultants
Pvt Ltd)
RF ENGINEER OCT 2009- NOV 2010
CURRENT J0B RESP0NSIBILITIES
Prepare, schedule and perform training of new hires. Keep knowledge of branch products
Offer on-going training to existing Telecom/RF employees including Practical Training on RF
Engineering.
Coordinate and implement all activities related to several training courses offered including
course and sending out invitations to participants, instructor scheduling, maintaining sign-in
records, ensuring correct room set-up and equipment, creating or ordering materials and
maintaining inventory.
Recommends research and develops training courses for Telecom Engineers & Provide support
for mentoring program for new employees and Foreign
Current Company Job Profile:
At UTL Group, our expertise across multiple domains along with stable partnerships has been
our driving force. We are continuously looking to extend our business horizons beyond Indian
shores. Today, our footprint extends over 60-plus nations across South Asia, Africa, America
and Europe.
Our international business presence in strategic locations has enabled us to deliver highly
reliable solutions, quickly and cost-effectively. Our credibility is established by our ability to
work effectively with some of the biggest players across various industries. Some of the
business conglomerates and technology partners we work with include Cisco, ZTE, Duratel, UT-
Starcom, Polycom and Emerson.
While we are rapidly expanding as one of India's leading business houses, our overriding vision
remains unchanged – to offer the best-in-class solutions and services that significantly improve
the lifestyles of our customers.
PREVIOUS J0B RESP0NSIBILITIES
3G-3.5G / UMTS DT (RF Drive Test), DATA ANALYSER, C0-0rdination & FIELD
OPTIMIZATION
Optimization of UMTS sites based on Coverage_RSCP, Quality_Ec/Io, Pilot pollution,

21. Missing neighbors, Soft Handover using drive test data’s. Optimize to improve Ec/Io (Reduce Pilot
Pollution) by improving RSCP of dominant cells and reducing coverage (Interference) of less
dominant sectors through antenna Tilt changes and power changes, thus rectify the
overshooting sectors issues.
Checking Co scrambling code issues. Adding missing 3G-3G neighbors and deleting the long
neighbors using scanner measurements.2G GSM 900/1800 DRIVE TEST, DATA ANALYSER &
FIELD OPTIMIZATION: Physical optimization of existing sites. Finding out the Interference
problem & rectify the same. Identify the reasons for TCH Blocking, TCH Drop & Handover
failures.
Primary verification of drive data and taking necessary corrective measures, like Neighbour
addition and deletion and interference analyasis.Providing appropriate Tilts (Electrical
/Mechanical) to reduce the interference or improve the coverage.3.5G DRIVE TEST - HSDPA &
HSUPA drive testing for checking throughput in Network.HSDPA parameters like CQI,
Modulation etc.
2G-GSM,RF DATA ANALYSER, C0-0rdinati0n & FIELD OPTIMIZATION
Optimization of GSM sites based on Coverage_Rx Level, Quality_Ec/Io, Pilot pollution
Proposing new sit after analysis of coverage issue. Coverage by skewing sectors, down tilt/Up tilt,
power increase/decrease by using better antenna gain
Site Auditing and Verifying Hardware, Tilt, Antenna height and Orientation, According to the site
database
Analyzed the Drive test log files using TEMS Investigation. Find the swap, Interference in the sites
during the optimization & resolve the swap .Missing neighbors, Soft Handover using drive test
data’s.
C0MPLETED PR0JECT
PR0JECT:
1) UNINOR-2G:-
ALCATEL LUCENT, ORISSA, INDIA
Duration: Oct 2009 to JAN 2010
2) VIDEOCON-2G
NSN, TAMILNADU, INDIA
Duration: FEB2010 to DEC 2010
3) AIRCEL 3G –
HUWEAI, KERALA, INDIA
Duration:
4) TATA 3G
HUWEAI, KERALA, INDIA
Duration:
5) IDEA 3G –
NSN, KERALA, INDIA
Duration:

22. Tools worked Upon:
TEMS Investigation 8,9,10 & 11
ACTIX
NEMO Outdoor 4 & 5.
ZENEX Probe 2.x & 3.x
Rhodes & Schwartz TSMQ scanner
PCTEL Scanner
MapInfo Professional 8.0, 8.5
MCOM
Technical Skills
Computer Proficiency: Have a good command over MS Office
Operating Systems: WINDOWS 98, XP, WINDOW 7
Skills, Knowledge and Abilities:
Proven ability to motivate others to study and excel
Ability to work with all levels of bank employees and maintain credibility,
trust, and cooperation
Resolve conflict and handle sensitive employee situations
Strong oral communication and presentation skills with ability to teach
adults
Strong professional image
Excellent at PC applications to develop training materials and manuals
Demonstrated organizational skills and implementing multiple priorities and
plans
Professional & Scholastic Qualifications
Standard University/School Year Percentage
B.E. (Electronics & Communication
Engineering)
(R.G.P.V.)
Shri RamCollege of
Engineering &
Management Gwalior
M.P. India.
2009 70.5%
XII
(Bihar. Board)
Maharaja College, Ara. Bihar
India.
2003 58.0%
X
(Bihar. Board)
R.N.P.High School, Ara, Bihar
India.
2001 69.0%
PERS0NAL PR0FILE:
Brief Profile: I am a Committed, gracious and enthusiastic person.
Strengths: Flexibility, Competitiveness, Cooperativeness
Date of Birth: ***********

23. Father’s name: *************
Gender: Male
Marital Status: Single
Language Known: Hindi, English
Nationality: Indian
Declaration:
I hereby declare that all the information furnished above is true to the best
of my knowledge and belief. I shall be responsible for any action if any of the above statements
are incorrect at any stage in future.
Place: Bangalore
Date-08/01/2013
(Dharmendra Kumar Singh)
GSM,WCDMA,RF ,RF Optimization Interview Objective Question
Level 2-3 NPO Questions
(RF Planning & Optimisation Engg)
In the following questions, please select one alternative which you think is the best answer for
the particular question.
Q1. SMS broadcast is done over which channel
1. SDCCH
2. BCCH
3. TCH
4. A & C
Q2. The parameter number of Slot Spread Trans (SLO)(BTS) is used to allocate a number of CCCH blocks
for .
a) Paging Channel (PCH)
b) Random Access Channel (RACH)
c) Access Grant Channel (AGCH)

24. d) Traffic Channel
Q3. Which of the following comment is true?
a) MAIO step is used to avoid intra-cell interference where as HSN is used to avoid inter-cell
interference
b) HSN is used to avoid intra-cell interference where as MAIO step is used to avoid inter-cell
interference
c) Both MAIO step and HSN are used to avoid intra-cell interference.
d) Both MAIO step and HSN are used to avoid inter-cell interference
Q4. Timer T200 is related with which KPI
a) SDCCH Completion rate
b) Paging success rate
c) TCH assignment success rate
d) All of the above
Q5. Which parameter defines how often paging messages are sent to MS?
a) No of Multi-frames between Paging (MFR)
b) Max No of Retransmission (RET)
c) No of Slots Spread Transmission (SLO)
d) No of Blocks for Access Grant (AG)
Q6. Which parameter is used as a margin to prevent ping-pong location updates?
a) PLMN-Permitted (PLMN)
b) Rx Level Access Minimum (RXP)
c) Cell Reselect Hysteresys (HYS)
d) Handover Margin Level (LMRG)
Q7. Which Parameter describes the minimum received field strength required by an MS to get any
service from the network in that cell in Idle mode?
a) PLMN-Permitted (PLMN)
b) Rx Level Access Minimum (RXP)
c) Cell Reselect Hysteresis (HYS)
d) Direct Access Level (DAL)

25. Q8. When is location updates carried out?
a) Every time an MS changes its location area under one MSC.
b) Every time an MS changes between two different MSCs
c) On a periodic basis set by a timer
d) All of the above
Q9. Increasing Radio Link Time Out (RLT) from 16 to 24 will improve following KPI
a) SDCCH Completion rate
b) TCH Completion rate
c) Paging Success rate
d) All of the above
Q10. If a cell is having TCH congestion, which of the following is true?
a) It is having TCH blocking
b) It may have TCH blocking.
c) It is having TCH Drop.
d) All of the above
Q11. Which of the parameter is set to zero for cyclic hopping?
a) BTS Hopping (HOP)
b) Hopping sequence number (HSN)
c) MAIO Offset (MAIO)
d) All of the above
Q12. What is directed retry?
a) A feature that allows a recovery system to restore a BCCH to its original TRX after fault has been
eliminated.
b) It is designed to control the traffic load of a frequency hopping radio network in which frequencies
are reused tightly.
c) It is used in call set up to assign a TCH to an MS from a cell outside the serving cell due to TCH
congestion
d) None of the above

26. Q13. Which of the following is measured as BER?
a) Received Signal Quality (RX QUAL)
b) Speech Quality Index (SQI)
c) Voice Quality
d) All of above
Q14. Polarization is characterized by
1. Direction of Magnetic Field
2. Direction of Electric Field
3. Direction of Electromagnetic Field
4. None of Above.
Q15 Which one is correct for TMA, TMB and Repeater?
1. Amplifies U/L, Amplifies D/L, and Amplifies both.
2. Amplifies D/L, Amplifies U/L, and Amplifies both.
3. Amplifies U/L, Amplifies D/L, and Amplifies U/L.
4. Amplifies U/L, Amplifies D/L, and Amplifies D/L.
Q16 Define Beam width of Antenna?
1. Angular distance between the points on two opposite sides of the peak direction where
the radiation intensity drops to the 1/2 of the peak intensity.
2. Angular distance between the points on two opposite sides of the peak direction where
the radiation intensity drops to the 1/3 of the peak intensity.
3. Angular distance between the points on two opposite sides of the peak direction where
the radiation intensity drops to the 1/4 of the peak intensity.
4. Angular distance between the points on two opposite sides of the peak direction where
the radiation intensity drops to the 1/8 of the peak intensity.
Q17 From which technique we cancel the effect of Rayleigh Fading?

27. 1. Antenna Hoping.
2. Frequency Hoping.
3. Antenna Diversity.
4. MAIO.
Q18 If HLR=5 Million subs, VLR/HLR=0.7,mErl/Sub=30.Then how much Capacity is required to
cater the subscriber in RF for 70% utilized Network.
1. 150 K Erl
2. 300 K Erl
3. 135 K Erl
4. 165 K Erl
Q19 Electrical Tilt antenna limits coverage through?
1. Tilting of Dipoles.
2. Inserting Phase Shift.
3. Inserting attenuation.
4. None of the above.
Q20 Which Antenna has the highest front to back Ratio?
1. Loop
2. Yagi
3. Dipole
4. Parabolic
Q21 Select relation between forward power and Reflected Power if load is not connected?
1. VSWR=1
2. VSWR=∞
3. VSWR=0
4. VSWR=1/2
Q22 What is the difference between splitter and coupler?
1. Even Distribution of Power in coupler and uneven distribution in splitter.
2. Uneven Distribution of Power in coupler and even distribution in splitter.
3. Even Distribution of Power in both.
4. Uneven Distribution of Power in both.

28. Q23. What are mobility management states in GPRS?
1. Idle,Standby,Ready
2. Dedicated,Standby,Ready
3. Idle,Dedicated,Standby
4. None of above
Q24. Which modulation is used for EDGE above MCS-4
1. QPSK
2. GMSK
3. 8PSK
4. PSK
Q25. What does SGSN stands for?
1. Serving Gateway Support node
2. Serving GPRS Support node
3. Serving GMSC Support node
4. None of the above
Q26 In dedicated mode, SMS comes on which channel?
a) SDCCH.
b) SACCH.
c) FACCH.
d) None of the above.
Q27 In Dedicated Mode, MS receives which system info. Messages?
1. System Info 1, 2, 3.
2. System Info 1, 2, 3,4,13.
3. System Info 5, 6.
4. None of the above.
Q28 Freq used in Uplink of Satellite communication is higher while in GSM it is lower. Why?
1. Loss α freq.
2. Loss α 1/freq.
3. Loss α sqr(freq)

29. 4. None of the above.
Q29 AMR is used to improve?
1. SQI
2. Downlink quality.
3. Uplink Quality
4. None of the Above.
Q30 In Idle Mode, MS receives which systeminfo. Messages?
a) System Info 1, 2,3.
b) System Info 1, 2, 3,4,13.
3. System Info 5, 6.
d) None of the above
Q31 The Common Control channel multiframe consists of?
1. 51 time slots.
2. 50 timeslots
3. 4 Time slots
4. 9 Time slots
Q32 Which of the following are true?
1. Type 1 Paging: can address up to 2 mobiles using either IMSI or TMSI.
2. Type 2 Paging: can address up to 3 mobiles, one by IMSI and the other 2 by TMSI.
3. Type 3 Paging: can address up to 4 mobiles using the TMSI only.
4. All of the above.
Q33 In GSM while performing handover
1. The MS breaks connection from source cell and then tunes on the target cell.
2. The MS continues connection from the source, tunes on the target and then releases
the source cell.
3. MS gets paging message from the target and replies it on its RACH and gets TCH
allocated.
4. MS gets paging message from the target and replies it on its RACH and gets SDCCH
allocated.
Q34 If E-RACH is used then which of the following is true?

30. 1. GSM range will increase beyond 35Km
2. It will increase no of RACH channels and release congestion on RACH.
3. SDCCH assignment will improve.
4. All above are false.
Q35 In dedicated mode the BTS receives handover command on?
1. TCH
2. SDCCH
3. SACCH
4. FACCH
Q36 The duration of a single timeslot is?
1. 4.615 ms
2. 1250 ms
3. 0.577 ms
4. 156.25 ms
Q37 Modulation used in GSM radio interface is?
1. Phase shift keying (PSK)
2. Gaussian Minimum shift Keying (GMSK)
3. Frequency modulation.
4. 8PSK.
Q38 TIE stands for?
1. Terminal Equipment identifier
2. Transcoder Input Erlang
3. TRX identifier for Edge TRX
4. None of the above
Q39 As per GSM Standard in case of frequency hopping the C/I value should be at least?
1. 3 dB
2. 6 dB
3. 9 dB
4. 12 dB
Q40 In inter BSC handover the handover is controlled by?

31. 1. GMSC
2. MSC
3. Source BSC
4. Target BSC
Q41 The maximum no of neighbors that can be defined with a cell is?
1. 8
2. 16
3. 32
4. 64
Q42 The permissible value of VSWR for feeder cable is?
1. < 1.3
2. >1.3
3. > 1
4. <2
Q43 The function of Transcoder is
1. To convert 64 kbps speech channel on A interface to 16 kbps speech channel on A-ter
Interface and vice versa.
2. To convert 16 kbps speech channel on A interface to 64 kbps speech channel on A-ter
Interface and vice versa.
3. To convert analogue speech signal from MSC to Digital signal for use of BSC
4. To convert analogue speech signal from BSC to Digital signal for use of MSC
Q44 TSC stands for
1. Time Synchronized Channel
2. Temporary subscriber code
3. Transcoder Signaling Controller
4. Training Sequence Code
Q45 If Cell bar is set to “yes” on a cell then

32. 1. It will reject new calls as well as handover calls
2. It will reject new call assignment but will receive calls by Handover
3. It will reject Handover but allow new call to come
4. The BTS will go into locked state.
Q46 DAP stands for
1. Dual Abis pool
2. Dynamic Allocation protocol
3. Dynamic Abis Pool
4. None of the above
Q47 Who can initiate the GPRS detach
1. The MS only
2. The SGSN only
3. Both the MS and the SGSN
4. None of the above
Q48 The mapping of logical name/Host name to IP addresses in the GPRS network is done by
1. Border Gateway
2. SGSN
3. GGSN
4. DNS
Q49 Where is the mobility management context established in GPRS
1. In the MSC
2. In the SGSN
3. In the GGSN
4. All of the above
Q50 Which layer uses the functionality of Uplink State Flag (USF)?
1. RLC Layer
2. Physical Layer
3. MAC Layer
4. All of the above

33. Q51 How many TDMA frames are there in a PDCH multiframe?
1. 51
2. 52
3. 26
4. 8
Q52 Which coding scheme does not use Forward Error Correction (FEC)?
1. CS-1
2. CS-2
3. CS-3
4. CS-4
Q53 Which new area is defined in GPRS compared to GSM?
1. Location Area
2. Routing Area
3. Both a and b
4. None of the above
Q54 Which layer is responsible for segmentation and reassembly of LLC PDUs and backward
error correction (BEC) procedures?
1. Physical Layer
2. Application Layer
3. RLC Layer
4. MAC Layer
Q55 Which coding scheme has adopted the same coding as used for SDCCH?
1. CS-1
2. CS-2
3. CS-3
4. CS-4
Q56 What is the single timeslot data rate for coding scheme CS-2

34. 1. 7.8 Kbit/s
2. 10.4 Kbit/s
3. 13.4 Kbit/s
4. 21.4 Kbit/s
Q57. Combiner works in
a) Downlink direction
b) Uplink direction
c) In both direction
d) As a Amplifier
Q58 Number of AMR codec modes used only in FR?
1. 6
2. 4
3. 2
4. 8
Q59 During conference call which channel is used to establish another call-
1. SACCH
2. SDCCH
3. FACCH
4. TCH
Q60 What is Duplex spacing.
1. Difference between first frequency of Uplink and last frequency of Downlink.
2. Difference between first frequency of Downlink and first frequency of Uplink.
3. Difference between last frequency of Downlink and first frequency of Uplink.
4. None of the above.
Q61 What does MSRN stands for ….
1. Mobile Station Registration Number
2. Mobile System Registration Number
3. Mobile Station Roaming Number

35. 4. Mobile Station Register Number.
Q62. If my MCC=404, MNC=05, LAC=100, CI = 14011, then what will be CGI for same??
1. 4040510014011
2. 404056436BB
3. 4040514433273
4. 4040510033273
Q63. Which information is there in Handover Access Command in Layer 3 Message?
1. BCCH & BSIC of Source
2. BCCH & BSIC of Target
3. Handover Reference Value
4. All of above.
Q64 What is the use of Immediate Assignment Extended Command?
1. Allocate AGCH for 2 Mobiles
2. Allocate SDCCH for 3 Mobiles
3. Allocate SDCCH for Call and SMS simultaneously.
4. None of Above.
Q65. What is the cause value for normal call release?
1. 16
2. 3
3. 14
4. 45
Q66. Location Update Request falls under which management system?
1. RRM
2. CM
3. CRM
4. MM
Q67. Which systeminformation message contains NCC Permitted Values?
1. SI 6
2. SI 2
3. All of Above.
4. None of Above.

36. Q68. When timer T3212 expires which process is initiated?
1. Cell Update
2. RAC Update
3. LAC Update
4. Handover
Q69. If AMR FR & AMR HR is enabled in network, then what will be the formula for counting
GSM FR Traffic with help of EOSFLX KPI Reports ?
1. Total Traffic – AMR FR Traffic
2. Total Traffic – AMR FR Traffic - AMR HR Traffic
3. Total Traffic – GSM HR Traffic – AMR FR Traffic – AMR HR Traffic
4. None of Above.
Q70. By reducing value of RET parameter it will help to improve which KPI?
1. TCH Drop
2. SDCCH Drop
3. HO Success
4. None of above.
Q71. What is the range of AMH TRHO PBGT Margin parameter?
1. -6 to +6, 255
2. -24 to +24, 255
3. -6 to +24, 255
4. +6 to +24, 255
Q72. What is the relation between HO Load Factor and HO Priority Level?
1. Load Factor > Priority Level
2. Load Factor >= Priority Level
3. Load factor < Priority Level
4. Load Factor <=Priority Level
Q73. Which are the basic features helps to distribute traffic in nearby cells?
1. DR
2. IDR
3. AMH
4. All of above

37. Q74. Using Multi BCF Common BCCH feature operator can expand how many numbers of TRX
in one segment without using another BCCH?
1. 16
2. 24
3. 30
4. 36
Q75. While Using Path loss Criterion C2 which parameter should be made “0” so that this
particular cell have higher C2 Value even though having poor C1?
1. CRO
2. TEO
3. Penalty Time
4. None of above.
Q76. Common BCCH feature is implemented in network, then which feature will help to access
the secondary freq. spectrum directly?
1. DR
2. DADB
3. DADL
4. All of above
Q77. Which types of GSM Reports are generated by Nemo Analyzer?
1. GSM Performance Report
2. GSM Benchmark Report
3. All of above
4. None of above
Q78. What is the range of parameter PMRG?
1. -24to +63
2. -24 to +24
3. -63 to +63
4. 0 to +63

38. Q79. How many maximum uplink TBF can be there per RTSL?
1. 6
2. 7
3. 8
4. 9
Q80. What should be minimum value of CDED (%) to have 1 RTSL as dedicated GPRS Timeslot
considering 2 TRX as GPRS TRX?
1. 0
2. 1
3. 8
4. 10
Q81. What does TRP Value = 3 means?
1. TCH allocation from BCCH TRX for non-amr user and from beyond BCCH TRX for amr
USER
2. TCH allocation from beyond BCCH TRX for non-amr user and from BCCH TRX for amr
USER
3. All of above
4. None of Above
Q82. How many basic EGPRS MCS Families are there?
1. 1
2. 2
3. 3
4. 4
Q83. Which is / are the main factors affecting the Radio Accessibility for TBF in UL/ DL?
1. Coverage
2. Capacity
3. Interference
4. All of above.
Q84. Which parameter setting can help to increase the TBF Retainability?
1. UL Power Control
2. DL Power Control
3. All of above.
4. None of above.

39. Q85. What should be SDCCH GOS when compared to TCH GOS?
1. SD GOS = TCH GOSDTX
2. SD GOS = 1/2(TCH GOS)
3. SD GOS = 1/4(TCH GOS)
4. SD GOS = 2(TCH GOS)
Q86. Which feature/technique is not used to reduce blocking / congestion?
1. Directed Retry
2. Traffic Reason Handover
3. Dynamic SDCCH
4. Intra Cell Handover
Q87. Rx Quality = 3 means BER =?
1. 0.2 - 0.4
2. 6.4 - 12.8
3. 1.6 - 3.2
4. 0.8 - 1.6
Q88. Following is false when using Dynamic SDCCH.
1. SDCCH Handover cannot be used.
2. Free TCH is used when SDCCH is required.
3. SDCCH carrying CBCH cannot be used.
4. Every SDCCH request can be fulfilled by Dynamic SDCCH.
Q89. In Link Budget; what has the least importance?
1. GSM Antenna Gain
2. Path Loss
3. Feeder Loss
4. MS Antenna Gain
Q90. When 2 calls are made from different TRXs of same cell having 1*1 RF hopping; what plays
important role to neglect C/I?
1. MAL ID
2. HSN
3. MAIO Step
4. MAIO Offset
Q91. Frame loss can be reduced by:
1. Speech Coding
2. Channel Coding
3. Interleaving

40. 4. Burst Formatting
Q92. What can be done to overcome combiner loss when cell is upgraded from 2 TRX to 3 TRX?
1. Remove Combiner
2. Air-Combining
3. HOP = OFF
4. TMA Implementation
Q93. What is the Basic feature amongst below:
1. SAIC
2. STIRC
3. AMR Progressive Power Control
4. Freq. Hopping
Q94. Out of following channels which one is common channel?
1. AGCH
2. SACCH
3. TCH-FR
4. FACCH
Q95. Out of following channels which one is the answer to RACH?
1. SDCCH
2. AGCH
3. FACCH
4. SACCH
Q96. In Air-interface TDMA time-slot means how many Seconds?
1. 576.9us
2. 4.615ms
3. 6.12sec
4. 480ms
Q97. Which type of antenna is used in MS?
1. Dipole
2. Omni
3. Loop
4. Cross-polar
Q98. Choose the correct Erlang Formula?
1. x Erlang= (calls per hour) * (average call duration)/3600 Sec
2. x Erlang= (no. of user)*(3600 sec)/ (calls per hour)
3. x Erlang= (no. of calls)*(no. of user)/ (average call duration)
4. x Erlang= (calls per hour)*(no. of users)/3600 sec

41. Q99. If GOS of an N/W is 3%, what does it mean?
1. 3 out of 100 calls may fails
2. average call duration is 3min
3. at a time 3% of total users can make a call
4. 3% blocking in the N/W is permitted
Q100. Which type of message is "Identity Request”?
1. Mobility Management
2. Radio Resource Management
3. Call Control
4. Call related SS message
Q101. Paging message type 2 contains.
1. Paging message for 3 mobiles
2. Paging message for 2 mobiles
3. Paging message for 4 mobiles
4. Paging message for >4 mobiles
Q102. Out of following which one is not a part of NSS?
1. Mobility Management
2. Connection Management
3. Radio Resource Management
4. Charging
Q103. In L3 messages, out of following Info messages which one carries Dedicated Mode
Information?
1. System Info 2
2. System Info 4
3. System Info 5
4. System Info 13
Q104. Which one out of following is not a part of AMR Codec Modes?
1. 4.6
2. 5.9
3. 7.4
4. 12.2
Q105. Frequency Hopping…
1. Eliminates the problem of fading dips
2. Eliminates the problem of ISI
3. is part of channel coding
4. spreads the problem of fading dips to many mobile stations

42. Q106. ISI is caused by:
1. fading dips
2. the Viterbi equalizer
3. reflection
4. interleaving
Q107. Maximum data throughput / tsl possible incase of GPRS is: X`
1. 18.8kbps
2. 27.2kbps
3. 29.2kbps
4. 21.4kbps
Q108. Out of following which element/s in the GSM N/W can not initiate HO?
1. BSC
2. BTS
3. MSC
4. None of Above
Q109. Out of following, which type of antenna has highest directivity?
1. Dipole
2. Helical
3. Log-Periodic
4. Yaagi-Uda
Q110. When we say the output power of a Transmitter is 30dBm, how many watts does it
mean?
1. 3W
2. 1W
3. 1mW
4. 30mW
Q111. Out of following which one is a passive device?
1. Repeater
2. Cross Polar Antenna
3. TMA (Tower Mount Amplifier)
4. TRX
Q112. Out of following which can not be observed during Drive-test?
1. Rx Quality
2. Location Update
3. Paging Load

43. 4. GPRS Attach
Q113. If a cell is EDGE capable, how much Downlink Throughput can we guarantee to
customer?
1. 59.2kbps
2. 473.6kbps
3. 236.8kbps
4. can't guarantee
Q114. How many blocks of AGCH are reserved in non combined mode?
1. 1-7
2. 0-2
3. 0-7
4. None of Above.
Q115. What are the contents of authentication triplets?
1. A3,A5,A8
2. SRES,RAND,Kc
3. RAND,A3,A8
4. SRES,Kc,A8
Q116 Frequency hopping in a network:
1. May or may not be implemented
2. Does not provide optimal gain if the hopping frequencies are less than 4
3. Both above are correct.
4. None of the above.
Q117 .Which of the following functions is not done by SDCCH CHANNEL:
1. Authentication
2. Transmission of short messages
3. Adaptive power control information from BTS to MS only
4. Assignment of traffic channel to MS.
Q118 How many TS can be used at the most with HSCSD?
1. 2
2. 4
3. 6

44. 4. 8
Q119 What should be the value of C/I when you are in hopping mode?
1. Above 9
2. Above 12
3. Less than 9
4. All of the above are correct
Q120 Which value of level and quality should be considered for analysis in a DT log
1. Full
2. Sub
3. Both
4. None of the above is correct.
Q121 What are the coding schemes observerd in UL/ DL after implementing EDGE in your
Network:
1. CS1-CS4
2. MCS1-MCS6
3. MCS5-MCS9
4. MCS1-MCS9
Q122 What does DAP stand for?
1. Dynamic Abis Pool
2. Dynamic Access Pool
3. Dynamic Access Protocol
4. None of the above
Q123 How many codec’s can be defined for AMR HR
1. 5
2. 2
3. 6
4. 4
Q124 How many TRX’s can be accommodated max on a single E1 where DAP pool is assigned
for 4 TS in a Ultra site

45. 1. 12
2. 16
3. 18
4. 24
Q125 How much traffic will be offered by a sector having 4 TRX with GOS of 2%
1. 24Erlangs
2. 21.03Erlangs
3. 23.56Erlangs
4. 22.12 Erlangs
Q126 Which ND report would you refer in order to find the discrepancy for Handovers?
1. Report 163
2. Report 166
3. Report 153
4. Report 208
Q127 On what basis would an optimizer decide whether the site serving is overshooting:
1. On the basis of TA
2. From ND report 232
3. Physically verifying whether the cell is having up tilt
4. All of the above
Q128 BBH is generally implemented where:
1. For dense network
2. For small capacity network
3. For cells where tight frequency reuse is required
4. None of the above
Q129 In case of Directed retry HO:
1. HO is performed from TCH of serving to TCH of Adjacent cell
2. HO is performed from SDCCH of serving to TCH of adjacent cell

46. 3. HO is performed from TCH of Serving to SDCCH of adjacent cell
4. HO is performed from SDCCH of serving to SDCCH of adjacent cell
Q130 Which alarm indicates the TRX faulty operation in the system:
1. 7601
2. 7602
3. 7725
4. 7745
Q131 C/I estimation during a DT can be done in:
1. U/L
2. D/L
3. Both A&B
4. Cannot be estimated.
Q132 Which is the unique feature in TEMS for analsing speech quality:
1. Rx qual Full
2. Rx Qual Sub
3. SQI
4. Rx Qual.
Q133 Drop calls due to Handovers can be caused basically due to:
1. Neighbors with Co-BSIC
2. Neighbor with Co-BCCH
3. Neighbors with Co-BCCH and Co-BSIC
4. All of the above.
Q134 Consider a cell where the no calls are happening, the probable causes would be
1. Wrong definition of LAC,CI
2. DMAX=0
3. Only A is correct
4. Both A&B are correct.
Q135 What should be the value of Rxlev Access min set:

47. 1. -47dbm
2. -110dm
3. -65dbm
4. -85dbm
Q136 What would be the output of a cell with parameter setting as
MstxPwrmax=0db,BsTxPWrMax =30db
1. Cell will carry max.no of calls
2. Cell will carry very few calls
3. Cell will not be latched
4. Cell with a correct parameter setting.
Q137 What would be the power loss after using a combiner in a sector:
1. -2db
2. -1db
3. -3db
4. -4db
Q138 What will happen in case where GTRX=Y(Non Edge TRX),EDGE=Y:
1. TRX will be unlocked
2. System will not allow the TRX to be unlock
3. TRX will go in Block state
4. Both B&C are correct.
Q139 Which report would give you the total payload for GPRS:
1. 232
2. 208
3. 228
4. 226.
Q140 In a Flexi BTS 1 physical TRX would logically represent how many Trx:
1. 1
2. 2

48. 3. 3
4. None of the above.
Q141 ‘Booster ’ becomes a solution in case of :
1. Capacity
2. Coverage
3. A & B Both
4. None of the above
Q142 Recommended value of ITCF is :
1. 2
2. 0
3. 1
4. 4
Q143. Which ND report gives the data for RACH rejection on cell level?
5. 134
6. 132
7. 188
8. 111.
Q144. Which ND report would you refer in order to find the discrepancy for Handovers?
5. Report 163
6. Report 166
7. Report 153
8. Report 208
Q145.On what basis would an optimizer decide whether the site serving is overshooting:
5. On the basis of TA
6. From ND report 232
7. Drive test logs
8. All of the above
Q146.Which ND report would give you the total payload for GPRS:
5. 232
6. 208
7. 228
8. 226.
Q147 What is a Command to check active alarms on bts:

49. 1. ZERO
2. ZEQO
3. ZEOL
4. ZELO
Q148 Value of BSC Timers can be checked by command:
1. ZEFO
2. ZEDO
3. ZEHO
4. ZEGO
Q149 ND Report 71 Tells:
1. Adjacencies having highest success rate
2. Adjacencies having highest failure rate
3. All adjacencies
4. None of the above
Q150.Which report gives value of dedicated data time slots:
1. 051
2. 053
3. 061
4. 063.
Q151. Which is ND Report number for AMR Parameters?
1. 051
2. 111
3. 216
4. 053
Q152. Which report shows percentage of HO attempts happening due to GPRS?
1. 150
2. 151
3. 153
4. 154

50. Q153 Which ND report gives detailed analysis of a cell?
1. 204
2. 216
3. 186
4. 226
Q154 In which ND report we can see hourly Traffic Profile for a cell?
1. 180
2. 181
3. 182
4. 186
Q155. In which ND report we can see hourly call drops due to TCH_RF_NEW_HO counter?
1. 216
2. 213
3. 163
4. 166
Q156. In which ND report we can see adjacency discrepancy between neighbor definitions?
1. 061
2. 060
3. 067
4. 073
Q157. Which are the Coverage Enhancement Features of NSN System?
1. ICE
2. Reverse ICE
3. Smart Radio Concept(SRC)
4. All of Above
Q158. Which ND Report shows Paging Success Rate per LA?
1. 213
2. 216
3. 186
4. 222
Q159. Which ND report shows EGPRS KPI?
1. 230
2. 226

51. 3. 229
4. 228
Q160 Which counter shows DL multislot assignment in percentage?
1. msl_13
2. msl_14
3. msl_15a
4. msl_16a
Q161. How many 64 Kbps DAP TSLs are required if MS is using MCS 9 (consider: dedicated data
timeslot = 4, single data user attached)?
1. 2
2. 4
3. 6
4. 8
Q162. How many maximum Abis timeslots can be handle by PCU ?
1. 64
2. 128
3. 256
4. 264
Q163. What is the Maximum output power of Metrosite BTS in terms of Watt?
1. 5
2. 10
3. 20
4. 40
Q164. What is the maximum number of TRX’s can created per BCSU in BSC 3i with version S12?
1. 110
2. 200
3. 100
4. 220
Q165. Which interface is required to implement combine paging (Voice + Data)
1. Gs
2. DPM ( Dual Paging Mode)
3. Gn
4. DPT ( Dual Paging Transmission)

52. Q166. In which ND report we can see TRHO Handovers attempt and success?
1. 153
2. 154
3. 155
4. 156
Q167. How many TRX’s can be handled by 1 BB2F Card in Ultra Site BTS?
1. 2
2. 3
3. 4
4. 6
Q168. Which of the following BTS Type do not have combiner in-built in them?
1. Ultra Site
2. Metro Site
3. Flexi BTS
4. None of above
Q169. Which report will help to see EDAP Congestion?
1. 280
2. 281
3. 128
4. 082
Q170. In which ND report we can see paging deletion counts for cell level?
1. 180
2. 181
3. 182
4. 186
Q171 Out of following, which is true as per NSN Specification?
1. CDED<=CDEF
2. CDED>CDEF
3. CDED=CDEF+CMAX
4. CDEF=CDED+CMAX

53. Q172. What should be minimum value of CDED(%) to have 1 RTSL as dedicated GPRS Timeslot
considering 2 TRX as GPRS TRX?
1. 0
2. 1
3. 8
4. 10
Q173 Which report shows Intra Cell Handover Statistics?
1. 150
2. 153
3. 154
4. 158
Q174 What is the maximum data throughput/timeslot can be achieved in case of MCS 9?
1. 64 Kbps
2. 59.2 Kbps
3. 118 Kbps
4. 230.4 Kbps
Q175 Which BTS Type does not support Rx Diversity (RDIV) parameter?
1. Flexi Edge BTS
2. Ultra BTS
3. Metro BTS
4. Talk Family BTS
Q176 In case of EDGE which of the following CS offers highest coverage?
1. MCS 1
2. MCS 9
3. MCS 5
4. CS 1
Q177 Which ND Report shows Trx vise quality distribution?
1. 180
2. 269
3. 196
4. 169
Q178 ND Report gives radio timeslot configuration?
1. 111
2. 222
3. 121

54. 4. 051
Q179 Noise separation feature can be implemented in?
1. TCSM
2. BSC 3i
3. Flexi BTS
4. TRX
Q180 Which of the following is not a feature of GSM network alone, but also feature of analog
mobile communication network?
1. Digital transmission of user data in air interface
2. Possibility of full international roaming in any country
3. Better speech quality
4. Fully digitized switching exchange
Q181 which of the following is parameter affecting cell sites while planning the network
1. Antenna height
2. MS power
3. BTS Power
4. None Of Above
Q182 What is E interface?
1. MSC-MSC
2. MSC-VLR
3. MSC-HLR
4. HLR-VLR
Q183 In GSM which type of handover occurs?
1. Hard
2. Soft
3. Both of the above
4. Make before break
Q184 Choose the correct bit pattern of a flag in LAP-D format ?
1. 01111110
2. 11111111
3. 10101010.
4. 01010101.
Q185 Mobile identity is a part of?

55. 1. Physical layer Info
2. Lap-D Info
3. BSSMAP Info
4. GSM L3 Info
Q186 Maximum PLMN Permitted can be ?
a) 7
b) 8
c) 1
d) 2
Q187 how many BSIC possible if NCC=4, no of BCCH ARFCN =8 ?
a) 32
b) 64
c) 256
d) 1024
Q188 DTX helps in
a) Reducing TCH congestion
b) Reducing SDCCH congestion
c) Reducing interference
d) Improving paging success
Q189. BSSAP needs the services of SCCP to
a) Analyze A subscriber data
b) To perform Connectionless signaling with the MSC
c) Send MAP messages to HLR via the MSC
d) To make a virtual connection between the MS and the MSC
Q190. Which of the following is true?
a) MAP stands for Mobile Access Part
b) LAP-D protocol is used to communicate between MSC and BSC
c) MAP is used for communication between MSC and HLR
d) BSSAP is used for communicating between BSC and MS

56. Q191. If an inter MSC handover occurs during a call, the decision to make
a handover is done by
a) BSC controlling the target cell
b) MSC controlling the target cell
c) BSC controlling the current cell
d) MSC controlling the current cell
Q192. Which of the following is not an advantage of the GSM network
Compared to other networks which use the same frequency band?
a) Lower Carrier to Interference Ratio for signal reception
b) Use of MAP signaling
c) Frequency reuse is more efficient than in other networks
d) Lower bit rate for voice coding
Q193. The basic principle of speech coding in a GSM Mobile Station is
a) A-Law PCM with 8 bits per sample
b) -Law PCM at 104Kbits/s
c) A-Law PCM with special filtering at 13Kbits/s
d) None of the above
Q194. Authentication verification is carried out in
a) HLR
b) MSC
c) VLR
d) Authentication Centre
Q195. No calls initiating in a cell, handover traffic is present
1. wrong neighbor defined
2. CGI creation problem
3. Same BCCH Allocated in neighbor
4. None of above
Q196. Which of the following facility is not supported by Net monitor?
1. Neighbor Cell Id
2. DTX Status

57. 3. Ciphering status
4. HSN
Q 197. In a cell configured with phase diversity, with air combining, what should be ideal
distance between two antennas of same sector?
1. At least λ/4 separated
2. At least λ/10 separated
3. 0 distance
4. None of above
Q198. Which of the following is supported by remote tune combiner?
1. BB Hopping
2. RF Hopping
3. Cyclic Hopping
4. All of above
Q199. Which of the following is affecting SDCCH capacity on Abis Interface?
1. TRX Signaling Size
2. No of TCH in sector
3. EDAP Pool
4. OMU Signaling
Q200. Alarm no. 2993 indicates
1. TCH Drop on Abis Interface
2. TCH Drop on Ater Interface
3. TCH Drop on Air Interface
4. TCH Drop on A Interface