Abstract - E-UTRAN Radio Access Bearer (ERA
important parameter in LTE Key Performance In
improvement on it. This parameter is formed by
S1 bearer and the corresponding radio bearer.
that this function is related to the E-RAB ID and
Identifier. The E-RAB ID parameter is used to d
ERAB on the S1 interface. In a mobile network,
that affect the quality of service, such as Bit Err
end to end delay. These values define the QCI
planned improvements are not easy; hence the
is composed of these different complex parame
ERAP and parameters related to the Handover
proposed solutions of the results. As a result fo
uplink, ERAB Call Drop Rate is 0.05 and 72.41,
Also, SINR Intra Frequency Handover is 337 an
respectively. All of these initiatives were succes
Keywords - Mobile network, LTE, radio access
optimization.
I. INTRODUCTION
he completion of 4G technology is calculat
earliest in 2015. For this reason, 3G techn
developed. Then, LTE technology is obtain
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these studies. While this technology is call
is stated that it is the last step in the field o
before 4G [1]. High-definition television ser
multiplayer comes from interactive gaming
requires an HD-TV 10 - 20Mbit / s commun
Mbit/s for Blue Ray standards). However, t
well above the capacity of the previous tec
This situation revealed the delay problem.
interactive gaming systems have great sen
In this low latency issue, LTE has a 10ms
simultaneous gamers has provided a comp
Considering that the HSPA has a latency o
seen how great it is.
The channel bandwidth increased from 1.2
MHz in LTE. One of the major deficiencies
communication systems used is the interru
communication and loss of data transmiss
high speeds. With 100Mbit/s with 4G data
1Gbit/s are expected [3]. Performance in a
communications depends on improvement
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system. Recently for effective communicat
system, such as high speed, high reliability
communications antenna technologies tha
organs are emerging. Nowadays, many tra
can be proposed to meet the increasing da
communication.
Spatial multiplexing has gained importance
conservation and power efficiency in LTE t
multiplexing requires the deployment of a w
antennas in the transmitter and receiver. In
can be transmitted simultaneously from all
increases the speed of the data in a very la
different layers with an equal number of tra
antennas. This is called multi-input multi-o
communications (MIMO). Furthermore, rel
transmission of high-speed data in the pow
can be improved by using more antennas
receiver. Transmission-reception differenc
spatial multiplexing can be classified into s
techniques that do not require channel info
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transmission. Another category is closed lo
technology that uses channel information i
[5].
In this paper, an effective and fast optimiza
obtained for solving network quality proble
network. These have been applied in the a
specific region and the effects of the optim
sites have been determined.
The rest of the paper is organized as follow
describes measurement methods and DT
provides the brief discussion of the results
before and after optimization to see perfor
and finally Section 4 provides our conclusi
II. MEASUREMENT AND DRIVE TEST
TEMS is mobile equipment (ME) to use in
communications by Ericsson that includes
information on uplink and downlink signals
interface. It covers all kinds of information
level and quality between the station and t
to determine the performance of the optim
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drive tests are performed before and after
(DT) tool is given in Figure 1. It should be n
block diagram is shown instead of the test
it is not allowed by the mobile operator. He
ME used in active and passive mode, USB
connection of laptop and ME, GPS receive
charger to determine location and coordina
for to obtain all frequencies in operating ba
An effective soluti
A.GENC1
1
Isparta University of Applied Science, Isp
T
International Conference on Engineering T
Konya, Turkey, October 25-27, 2019
E-ISBN: 978-605-68537-9-1
##
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Figure 1: Drive test tool and map
As the DT Methodology, DT is performed u
are 2 different measurement methods. All
made in Singapore. In Figure 3, the DT rou
problematic points determined during DT i
conducted according to the optimization st
Figure 2: Cluster DT route (Planned)
III. RESULTS
E-UTRAN Radio Access Bearer (ERAB) is
parameter in LTE KPI analysis. This param
combining the S1 bearer and the correspo
can be noted that this function is related to
Quality Class Identifier (QCI). The E-RAB
used to determine the ERAB on the S1 inte
network there are values that affect the qu
(QoS), such as Bit Error Rate (BER) and e
These values define the QCI in LTE.
Another issue that makes ERAB paramete
effect on RRC Success Rate in LTE. Here
Radio Resource Control. RRC Success Ra
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service of the mobile network. And a Beare
bearer is usually defined as Data QCI9 by
QCI1 as dedicated. As a result, Mostly ER
addition of the default bearers.
As seen in Figure 3, suspected handover (
PCI_85 to PCI_437 caused RRC connectio
request from UE that eNodeB rejected. So
abnormally. As a result of looking after nei
sites are neighbor each other and also H/O
PCI_85 is preceded correctly. The solution
to add site id to neighbor list to increase ac
mobile network in site of PCI_85.
International Conference on Engineering T
Konya, Turkey, October 25-27, 2019
E-ISBN: 978-605-68537-9-1
##
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Figure 3: ERAB Abnormal Rel. Analysis (DL Po
With point 2, also suspected H/O failure fro
site 3161 to PCI_86 in same site caused R
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reestablishment request that eNodeB rejec
released abnormally. Both sectors are neig
These two abnormal release are all related
strongly suspected having unknown proble
disconnection of RRC connection is increa
transmitter antenna to remain of received U
Figure 4: DL ERAB Abnormal Rel. Analysis (DL
Point suspected H/O failure from PCI_86 t
caused RRC connection reestablishment r
International Conference on Engineering T
Konya, Turkey, October 25-27, 2019
E-ISBN: 978-605-68537-9-1
##
______________________________________
eNodeB rejected. So that ERAB released a
result of looking after neighbor list, both sit
each other and also H/O from PCI_404 to
correctly. On site of PCI_404 the antenna
increased to prevent overshooting problem
Figure 5: UL ERAB Abnormal Rel. Analysis (UL
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During the UL Test, we faced up frequent U
problem. After the HW check, it is observe
connector problem on site. When the conn
with new one, UE disconnected problem is
point 4 in Figure 6.
Figure 6: UL ERAB Abnormal Rel. Analysis (UL
The Key Performance Indicators (KPI) of th
network is given Table 1. The optimization
proposed solutions have yielded good resu
conducted after optimization can be seen a
International Conference on Engineering T
Konya, Turkey, October 25-27, 2019
E-ISBN: 978-605-68537-9-1
##
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have improvement. The SINR Intra Freq H
ERAB Accessibility Rate, Intra Freq HO Su
ERAB Accessibility Rate have the 100% su
Therefore, it is seen that these parameters
results in the sites where optimization chan
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for downlink and uplink ERAB Call Drop R
72.41, respectively.
Table 1: Performance results overview after opt
Type of load way KPI
Statistics
Attempt Success Percentage
Download
Inter FreqHO Success Rate - - SINRIntra FreqHO Success Rate 337 337 100
ERAB Accessiblity Rate 34 34 100
Upload
Inter FreqHO Success Rate - - Intra FreqHO Success Rate 406 406 100
ERAB Accessiblity Rate 29 29 100
Type of load way Performance
ERAB
Abnormal
Release
ERAB
Setup
Success
Rate
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Download ERAB Call Drop Rate 2 34 0.05
Upload ERAB Call Drop Rate 21 29 72.41
Mobile operators attach importance to the
different departments listed in Figure 7 to a
for network quality. Although the regions a
which these various departments study are
directly affect each other's performance. F
should study efficiently within the boundary
instantly with other units. However, they sh
productively and result-oriented. This prov
power and time. Mobile technologies start
process. In this process, simulation softwa
planning and wave propagation is used. Th
station can be applied to which region is de
the planning stage, the location of the stati
target average signal level is determined fr
simulation. In the third stage of implementa
vendors make implementation of devices a
site. Then optimization engineers check th
making optimization to improve the quality
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Last they inform mobile operator the proce
Figure 7: DT route
IV. CONCLUSION
E-UTRAN Radio Access Bearer (ERAB) is
parameter in LTE KPI analysis. Also, it dire
RRC Success Rate of the mobile network.
engineers work with RF planners to improv
However, this improvement is not always e
immediately. Therefore, the optimization m
to the network should be as accurate and e
In this study, the solutions proposed in the
found to provide improvements in ERAB va
parameters. As a result The SINR Intra Fre
ERAB Accessibility Rate, Intra Freq HO Su
ERAB Accessibility Rate have the 100% su
Therefore, it is seen that these parameters
results in the sites where optimization chan
for downlink and uplink ERAB Call Drop R
72.41, respectively.
REFERENCES
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##
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Citations (2)
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Predicting the Accuracy of Accessibility of LTE Network Using ANN
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C2 – Vodafone Idea Internal
Bearer (ERAB) is an
rformance Indicator
is formed by combining the
adio bearer. It can be noted
RAB ID and Quality Class
is used to determine the
bile network, there are values
ch as Bit Error Rate and the
ine the QCI in LTE. The
y; hence the ERAB parameter
plex parameters. In this paper,
e Handover are improved by
s a result for downlink and
5 and 72.41, respectively.
ver is 337 and 406,
were successfully completed.
adio access network,
is calculated at the
, 3G technology is
gy is obtained as a result of
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logy is called 3.9G or Pre4G, it
n the field of communication
levision service (HD-TV) and
ive gaming service. This
/ s communication speed (18
However, this technology is
revious technology, HSPA.
y problem. Multi-player
e great sensitivity to delay [2].
as a 10ms latency for
ded a complete key feature.
a latency of 60ms, it can be
ed from 1.25 20 MHz to 100
eficiencies of the
s the interruptions in
transmission while moving at
h 4G data transfer rates of
mance in antenna
provements in an antenna
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ommunication in the 4G
gh reliability and long series
ologies that affect multiple
s, many transmission programs
creasing data rate needs of data
importance with bandwidth
cy in LTE technology. Spatial
yment of a wide range of
receiver. Independent currents
sly from all antennas [4]. This
in a very large number of
umber of transmit and receive
put multi-output
ermore, reliability in the
a in the power-down channels
antennas in the transmitter or
n difference and transmission
sified into space-time coding
hannel information in
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is closed loop multi-antenna
formation in the transmitter
ast optimization study is
ality problems in LTE
ied in the area serving a
f the optimization study on the
ed as follows: Section 2
ds and DT details; Section 3
the results, comparison of
see performance of this study,
ur conclusions.
) to use in mobile and cellular
at includes all the field
ink signals in the Airnformation about the signal
ation and the ME [8]. In order
f the optimization, two separate
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e and after the study. Drive test
should be noted that the
of the test tool in real time as
perator. Here, it can be seen
mode, USB Cable for
PS receiver, laptop and
nd coordinates. Scanner is used
perating band.
solution of ERAB pro
cience, Isparta/Turkey, abdullahgenc@isparta.
gineering Technologies (ICENTE'19)
2019
__________________________________________
C2 – Vodafone Idea Internal
performed using TEMS. There
ethods. All measurements are
the DT route is given. The
during DT in this region are
mization study of this paper.
r (ERAB) is an important
This parameter is formed by
e corresponding radio bearer. It
s related to the E -RAB ID and
he E-RAB ID parameter is
the S1 interface. In a mobile
fect the quality of service
BER) and end to end delay.
LTE.
B parameter important is its
LTE. Here the RRC is the
Success Rate is required for
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And a Bearer can do that. The
a QCI9 by default and VoLTE
Mostly ERAB is formed by the
handover (H/O) failure from
C connection reestablishment
ejected. So that ERAB released
ng after neighbor list, both
nd also H/O from PCI_437 to
he solution of this problem is
ncrease accessibility of
gineering Technologies (ICENTE'19)
2019
__________________________________________
lysis (DL Point1)
O failure from PCI_85 of
e caused RRC connection
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NodeB rejected. So that ERAB
ors are neighbor each other.
e all related to PIC_85 that
own problem. The redress of
on is increasing the power of
f received UE data in site 3161.
Analysis (DL Point2)
m PCI_86 to PCI_404
blishment request from UE that
gineering Technologies (ICENTE'19)
2019
__________________________________________
B released abnormally. As a
ist, both sites are neighbor
CI_404 to PCI_86 is preceded
e antenna down tilt is
ng problem.
Analysis (UL Point3)
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p frequent UE disconnected
is observed that there is
en the connector is changed
problem is solved for UL
Analysis (UL Point4)
s (KPI) of the mobile
ptimization study by applying
d good results. The statistics
n be seen and most of the KPIs
gineering Technologies (ICENTE'19)
2019
__________________________________________
ntra Freq HO Success Rate,
Freq HO Success Rate and
he 100% success rate.
parameters have high and good
zation changes are made. Also
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Call Drop Rate is 0.05 and
iew after optimization
37 337 100
6 100
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34 0.05
9 72.41
nce to the work of the
igure 7 to achieve KPI goals
e regions and methods in
ts study are different, they can
ormance. For this, each unit
e boundary and communicate
ver, they should work
. This provides ease of work,
ogies start with Design
tion software related to radio
is used. Thus, what kind of
region is determined. Then, in
of the stations according to the
termined from the map of
implementation the mobile
of devices and components to
rs check the performance of
the quality of related sites.
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r the process is done or not.
r (ERAB) is an important
Also, it directly effect of the
e network. So, optimization
s to improve this parameter.
ot always easy, and not
mization method to be applied
urate and effective as possible.
osed in the results section is
in ERAB value and HO
NR Intra Freq HO Success Rate,
Freq HO Success Rate and
he 100% success rate.
parameters have high and good
zation changes are made. Also
Call Drop Rate is 0.05 and
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Performance analysis of advanced
ure with multiple small cell
169-1190, 2017.
atika, vol. 57, pp. 774-781,
ptimizing the cellular
coverage using simulation, J.
9, 2013.
network planning and
vol. 23, pp. 118-125, 2016.
. Klein, Optimizing the radio
olution system using Taguchi's
. 60, pp. 3825-3839, 2011.
Quality of service assessment: a
ng of cellular network operators
Engineering & Computer
, G.F. Pedersen, Measurement of
llular Network Bands, IEEE
p. 2260-2263, 2018.
abi, GSM quality of service
onal Journal of Computer
gineering Technologies (ICENTE'19)
2019
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__________________________________________
IJCSEA), vol. 7, pp. 29-40,
a, M. Tomala, B. Gyula, B. Sebire,
GPP, IEEE Commun. Mag.,
produced by the radiated
em, IEEE Trans. Electromagn.
age Analysis of Mobile Network in
rsonal Communications, vol.
gineering Technologies (ICENTE'19)
2019
__________________________________________
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d voice transmission, reserved frequency bands for GSM is still in use due to its strengthen against multipath fading and it p
rk Operator...
performance. Optimization is basically the most effective way to monitor the network by examining statistics data in detail a
Cellular Network...
etwork operators to optimize their networks and to enter into new business models. We use geographically resolved cellular
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pends on large variety of factors. Because of that mobile operators are willing to timely and effectively evaluate provided Qu
ates and financial stability by constantly monitoring, analyzing and optimizing the radio network performance to provide bet
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B problems in LTE
c@isparta.edu.tr
__________________________________________
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nst multipath fading and it provides wider coverage area. Poor coverage problems caused by low signal level directly reduc
ing statistics data in detail and obtaining/analyzing drive test results. This enables network growth and capacity developme
graphically resolved cellular measurements from smartphones as defined since LTE Release 10 in 3GPP TS 37.320 for the
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ctively evaluate provided Quality of Service (QoS) in their networks. Nowadays the main tool for monitoring network state an
performance to provide better subscriber quality. A real time non-intrusive performance evaluation of the network allows th
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LTE
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w signal level directly reduce network performance and cause undesirable cases for voice transmission. The aim of this stu
wth and capacity development, problems in the operation and maintenance unit of the mobile network are ... [Show full abst
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