WiMAX RS (relay station) is investigated for the purpose of saving overall cost by decreasing the number of RS to cover the territory of base station. relay stations in communication free ppt download
Cost Effectively Deploying
Relay Stations (RS) in
IEEE 802.16m (WiMAX-2)ABSTRACT
In this thesis the WiMAX RS (relay station) is investigated for the
purpose of saving overall cost by decreasing the number of RS to
cover the territory of base station and also to provide the services to
mobile users out of the range of base station.
Secondly, the throughput and delay matrices have been taken to
enhance the system performance.
In addition to cost effective deployment of RS and evaluation of
throughput and delay using relay station, the third factor which is
with comparison of QoS classes is also made in order to see the
overall performance of WiMAX network.
Simulation Tool Used: OPNET 16.0Thesis Aims
The aim of the thesis is to cost effectively
deploy the RS in a WiMAX network and
also to takes measures to enhance the
QoS and conduct an analysisContinued….
• To acquire detail knowledge of WiMAX and WiMAX2 technology
• To investigate different methods and techniques for RS deployment in order
to cut down the costs.
• To understand the different problems in maintaining cost effective
deployment of RS.
• To investigate and analyse different QoS characteristics such as throughput,
delay, and network load.
• To investigate and evaluate different techniques to improve overall system
performance which provides guaranteed QoS.
• To assess published major approaches (through literature review) on WiMAX
RS planning and optimization.
• To investigate advance antenna technology and MIMO to further improve
coverage and throughput in WiMAX2.
• To investigate and implement an efficient way to reduce delay and enhance
throughput to meet the QoS standard in 802.16m.Introduction to WiMAX-2
WiMAX2 or IEEE 802.16m is the advance version of WiMAX
which is based on its
previous version IEEE 802.16e .
it supports 300 Mbps data rates.
WiMAX forum has name IEEE 802.16m as WiMAX2.
WiMAX2 uses the OFDM (orthogonal frequency division
multiplex) and other advance antenna technology like MIMO
(multiple inputs and multiple outputs) for better performance.
The main purpose of IEEE 802.16m WiMAX standard is to
improve spectral efficiency, improve VoIP capacity, handover,
and speed coverage range.
The IEEE 802.16m works with the radio frequency range from
2 to 6 GHz as well as it also supports scalable bandwidth of
range 5 to 20MHzRelay Stations in WiMAX
Relay stations enhance the capacity, throughput and coverage area
of BS (Base station) in the technologies like WiMAX and LTE.WiMAX Relay Stations Types and
Deployment ScenariosProposed Solution
• In order to provide guaranteed QoS to the users out of the range
of BS, four RS are
• used in rural areas to cover the territory of the BS. Each RS
cover additional cell radius
• to boost the BS signals to the end users which are out of the
To provide better QoS and minimizing the cost can be
achieved by dividing the cell into three sectors and
deploying a RS in each sector at QPSK ¾ zones
which can be inside the boundary of the cell.
• Deploying RS at QPSK ¾ zone, the signal strength
and SNR will be more as compare to cell edge area
or QPSK ½ zones. However, three RS can consider
not enough to cover all of the territory of BS as
compare to four RS.Simulation Parameters Relay StationsDeployment with three RS
• The main aspect of network planning is to estimate the number of users that
each BS may serve and how the bandwidth is allocated to the user’s
connections is typically left to operator configuration, which means it
depends on the configuration of operators that how much bandwidth they
allocate for each end user.Relay station Deployment with Adaptive
modulation and codingTopology based on different environmentsRS PositionRESULTSThroughput comparisons with four and three RSThe average throughput of three nodes placed
at different anglesAverage load using three and four RSAverage delay three and four RSReferences
1 J Elgered, A.S Moghaddam, and B Vedder, “How Quality of Service (QoS) is
achieved in WiMAX (IEEE 802.16)”
2 D Ghosh, a Gupta, P Mohapatra “Adaptive Scheduling of Prioritized Traffic in
IEEE 802.16j wireless networks” IEEE International Conference 2009
3 F.G Sanchez and L Zhao “Efficient Mobile WiMAX Capacity Estimations in a
Multihop Environment” November 2008, pp. 1640 -1646.
4 R. Balakrishnan, X. Yang, M. Venkatachalam and Ian F. Akyildiz “Mobile
Relay and Group Mobility for 4G WiMAX Networks” IEEE 2011
5 Y Wang and H Li – “Full Rate and Full Diversity STBC in Decode-and- Forward
Relay Systems”. 2010 International Conference
6 H. Dahmouni, H. El Ghazi, D. Bonacci, B. Sansò and A. Girard “Improving
QoS of all-IP Generation of Pre WiMAX Networks Using Delay-Jitter Model”
VOLUME 2, ISSUE 2, MAY 2010
7 B AK Can, H Yomo and E De Carvalho “Link Adaptation and Selection Method
for OFDM Based Wireless Relay Networks” VOL. 9, NO. 2, JUNE 2007