www.ijatir.org ISSN 2348–2370 Vol.08,Issue.23, December-2016, Pages:4566-4574 Copyright @ 2016 IJATIR. All rights reserved. Study and Analyze WCDMA Cell Site Coverage Planning for the Case of Hawassa City LAMESSA DINGETA 1 , GELAYE GERESU 2 , SALIVENDRA SUBRAHMANYA SASTRY 3 1 HOD, Dept of ECE, Asossa University, Ethiopia, E-mail: [email protected]. 2 Dept of ECE, Asossa University, Ethiopia, E-mail: [email protected]. 3 Assistant Professor, Dept of ECE, Asossa University, Ethiopia, E-mail: [email protected]. Abstract: The main aim of the thesis is to study and analyze WCDMA cell site coverage planning for the case of Hawassa city. It is the intension of the work to understand the different modeling approaches, input and output parameters in WCDMA coverage dimensioning. In cellular 3G network, there are sequential steps for radio network planning. These steps start from simple analysis to computer aided mathematical computation; i.e., from nominal planning state to detail planning and then optimization. In fact, the entire planning problem is decomposed into three sub-problems: the cell site planning subproblem, the access network planning sub problem and the core network planning subproblem. Coverage estimation is the critical step in RAN(Radio Access Network) planning, specially for the system to be deployed. Nominal radio network planning is done basically using link budget calculation to estimate the cell size. In most cases, since the simplicity of this stage is needed the coverage estimation is done with a general propagation model which doesn’t incorporate the actual geographical information (terrain model). Thus, the major problem in the obtained result is its closeness to the real coverage results. In order to make this RAN planning stage more accurate, the inclusion of the terrain model has to be considered in simple manners, so that improvement in the result is obtained while the simplicity of the process is still maintained. In general, to resolve this problem proper design of network planning is necessary. Keywords: Hawassa, WCDMA, RAN, Sub Problem. I. INTRODUCTION 3G refers to the 3rd generation of mobile telephony (that is cellular) technology.The 3 rd generation as the name suggests, follow two earlier generations. The 1st generation (1G) began in the early 80’s with commercial development of Advanced Mobile Phone Service (AMPS) cellular networks. Early AMPS network used Frequency Division Multiple Access (FDMA) to carry analog voice over channels in the 800MHZ frequency band. The 2 nd generation (2G) emerged in the 90’s when mobile generators deployed two competing digital voice standards. In the North America, some operators adopted IS-95, which uses CDMA to multiplex up to 64 calls per channel in the 800MHZ band. Across the world, many operators adopted the Global System for Mobile communication (GSM) standard, which used the Time Division Multiple Access (TDMA) technique to multiplex up to 8 calls per channel in the 900MHZ and 1800MHZ spectrum bands. The International Tele- communication Union (ITU) defined the 3rd generation (3G) of mobile telephony standards IMT-2000 to facilitate growth, increase bandwidth and support more diverse applications. Some of the limitations of 2G systems are; it’s only voice oriented, it has limited data capabilities, no worldwide (WW) roaming and incompatible system in different countries. Despite the extension of 2G system i.e. 2.5G such as GPRS and EDGE, which provides the enhanced facilities and much improved data rates, but there are still incompatibility issues and WW-roaming problems. Therefore, there is a need of a system that could provide more advanced services. Some new requirements of the 3G systems are: Bit rates up to 2Mbps Variable bit rate to offer bandwidth on demand Multiplexing of services with different Qos requirements on a single connection Quality requirements from 10% frame error rate to 10-6 bit error rate. Co-existence with different systems and inter-system handovers for coverage enhancements and loading balancing Uplink and downlink asymmetry e.g. web browsing causes more loading to downlink than to uplink. High spectrum efficiency Co-existence of FDD (Frequency Division Duplex) and TDD (Time Division Duplex) modes The target of any radio network operator is to minimize the Capital Expenditure (CAPEX) of the equipment required for an operational radio network. In turn, a lesser amount of radio network equipment typically results in lower Operational Expenditure (OPEX). From the technical point of view, the radio interface planning process of a cellular mobile communication system targets providing the required network coverage, system capacity, and sufficient Quality of Service (QoS) with minimum economic constraints. The
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www.ijatir.org
ISSN 2348–2370
Vol.08,Issue.23,
December-2016,
Pages:4566-4574
Copyright @ 2016 IJATIR. All rights reserved.
Study and Analyze WCDMA Cell Site Coverage Planning for the Case
of Hawassa City LAMESSA DINGETA
1, GELAYE GERESU
2, SALIVENDRA SUBRAHMANYA SASTRY
3
1HOD, Dept of ECE, Asossa University, Ethiopia, E-mail: [email protected].
2Dept of ECE, Asossa University, Ethiopia, E-mail: [email protected].
3Assistant Professor, Dept of ECE, Asossa University, Ethiopia, E-mail: [email protected].
Abstract: The main aim of the thesis is to study and
analyze WCDMA cell site coverage planning for the case
of Hawassa city. It is the intension of the work to
understand the different modeling approaches, input and
output parameters in WCDMA coverage dimensioning. In
cellular 3G network, there are sequential steps for radio
network planning. These steps start from simple analysis
to computer aided mathematical computation; i.e., from
nominal planning state to detail planning and then
optimization. In fact, the entire planning problem is
decomposed into three sub-problems: the cell site planning
subproblem, the access network planning sub problem and
the core network planning subproblem. Coverage estimation
is the critical step in RAN(Radio Access Network) planning,
specially for the system to be deployed. Nominal radio
network planning is done basically using link budget
calculation to estimate the cell size. In most cases,
since the simplicity of this stage is needed the coverage
estimation is done with a general propagation model which
doesn’t incorporate the actual geographical information
(terrain model). Thus, the major problem in the obtained
result is its closeness to the real coverage results. In order
to make this RAN planning stage more accurate, the
inclusion of the terrain model has to be considered in
simple manners, so that improvement in the result is
obtained while the simplicity of the process is still
maintained. In general, to resolve this problem proper
design of network planning is necessary.
Keywords: Hawassa, WCDMA, RAN, Sub Problem.
I. INTRODUCTION
3G refers to the 3rd generation of mobile telephony (that is
cellular) technology.The 3rd
generation as the name suggests,
follow two earlier generations. The 1st generation (1G)
began in the early 80’s with commercial development of
Advanced Mobile Phone Service (AMPS) cellular networks.
Early AMPS network used Frequency Division Multiple
Access (FDMA) to carry analog voice over channels in the
800MHZ frequency band. The 2nd
generation (2G) emerged
in the 90’s when mobile generators deployed two competing
digital voice standards. In the North America, some
operators adopted IS-95, which uses CDMA to multiplex up
to 64 calls per channel in the 800MHZ band. Across the
world, many operators adopted the Global System for
Mobile communication (GSM) standard, which used the
Time Division Multiple Access (TDMA) technique to
multiplex up to 8 calls per channel in the 900MHZ and
1800MHZ spectrum bands. The International Tele-
communication Union (ITU) defined the 3rd generation (3G)
of mobile telephony standards IMT-2000 to facilitate
growth, increase bandwidth and support more diverse
applications. Some of the limitations of 2G systems are; it’s
only voice oriented, it has limited data capabilities, no
worldwide (WW) roaming and incompatible system in
different countries. Despite the extension of 2G system i.e.
2.5G such as GPRS and EDGE, which provides the
enhanced facilities and much improved data rates, but there
are still incompatibility issues and WW-roaming problems.
Therefore, there is a need of a system that could provide
more advanced services. Some new requirements of the 3G
systems are:
Bit rates up to 2Mbps
Variable bit rate to offer bandwidth on demand
Multiplexing of services with different Qos
requirements on a single connection
Quality requirements from 10% frame error rate to 10-6
bit error rate.
Co-existence with different systems and inter-system
handovers for coverage enhancements and loading
balancing
Uplink and downlink asymmetry e.g. web browsing
causes more loading to downlink than to uplink.
High spectrum efficiency
Co-existence of FDD (Frequency Division Duplex) and
TDD (Time Division Duplex) modes
The target of any radio network operator is to minimize
the Capital Expenditure (CAPEX) of the equipment required
for an operational radio network. In turn, a lesser amount of
radio network equipment typically results in lower
Operational Expenditure (OPEX). From the technical point
of view, the radio interface planning process of a cellular
mobile communication system targets providing the required
network coverage, system capacity, and sufficient Quality of
Service (QoS) with minimum economic constraints. The