102 research outputs found
CAC and Traffic Modeling for Integrated Macrocell/Femtocell Networks
Dense femtocells and the integration of these femtocells with the macrocell
are the ultimate goal of the femtocellular network deployment. Integrated
macrocell/femtocell networks surely able to provide high data rate for the
indoor users as well as able to offload huge traffic from the macrocellular
networks to femtocellular networks. Efficient handling of handover calls is the
key for the successful macrocell/femtocell integration. An appropriate traffic
model for the integrated macrocell/femtocell networks is also needed for the
performance analysis measurement. In this paper we presented a call admission
control process and a traffic model for the integrated macrocell/femtocell
networks. The numerical and simulation results show the important of the
integrated macrocell/femtocell network and the performance improvement of the
proposed schemes.Comment: International Conference on Ubiquitous and Future Networks (ICUFN),
July 2012, Thailan
Priority based Interface Selection for Overlaying Heterogeneous Networks
Offering of different attractive opportunities by different wireless
technologies trends the convergence of heterogeneous networks for the future
wireless communication system. To make a seamless handover among the
heterogeneous networks, the optimization of the power consumption, and optimal
selection of interface are the challenging issues for convergence networks. The
access of multi interfaces simultaneously reduces the handover latency and data
loss in heterogeneous handover. The mobile node (MN) maintains one interface
connection while other interface is used for handover process. However, it
causes much battery power consumption. In this paper we propose an efficient
interface selection scheme including interface selection algorithms, interface
selection procedures considering battery power consumption and user mobility
with other existing parameters for overlaying networks. We also propose a
priority based network selection scheme according to the service types. MN's
battery power level, provision of QoS/QoE in the target network and our
proposed priority parameters are considered as more important parameters for
our interface selection algorithm. The performances of the proposed scheme are
verified using numerical analysis.Comment: 7 pages, 7 figure
Handover Management in Highly Dense Femtocellular Networks
For dense femtocells, intelligent integrated femtocell/macrocell network
architecture, a neighbor cell list with a minimum number of femtocells,
effective call admission control (CAC), and handover processes with proper
signaling are the open research issues. An appropriate traffic model for the
integrated femtocell/macrocell network is also not yet developed. In this
paper, we present the major issue of mobility management for the integrated
femtocell/macrocell network. We propose a novel algorithm to create a neighbor
cell list with a minimum, but appropriate, number of cells for handover. We
also propose detailed handover procedures and a novel traffic model for the
integrated femtocell/macrocell network. The proposed CAC effectively handles
various calls. The numerical and simulation results show the importance of the
integrated femtocell/macrocell network and the performance improvement of the
proposed schemes. Our proposed schemes for dense femtocells will be very
effective for those in research and industry to implement
Adaptive Resource Management for Multimedia Applications in Femtocellular and Macrocellular Networks
The increasing demands of various high data rate wireless applications have
been seen in the recent years and it will continue in the future. To fulfill
these demands, the limited existing wireless resources should be utilized
properly or new wireless technology should be developed. Therefore, we propose
some novel idea to manage the wireless resources and deployment of
femtocellular network technology. The study was mainly divided into two parts:
(a) femtocellular network deployment and resource allocation and (b) resource
management for macrocellular networks. The femtocellular network deployment
scenarios, integrated femtocell/macrocell network architectures, cost-effective
frequency planning, and mobility management schemes are presented in first
part. In the second part, we provide a CAC based on adaptive bandwidth
allocation for the wireless network in. The proposed CAC relies on adaptive
multi-level bandwidth-allocation scheme for non-real-time calls. We propose
video service provisioning over wireless networks. We provide a QoS adaptive
radio resource allocation as well as popularity based bandwidth allocation
schemes for scalable videos over wireless cellular networks. All the proposed
schemes are verified through several numerical and simulation results. The
research results presented in this dissertation clearly imply the advantages of
our proposed schemes.Comment: PhD Dessertatio
Service Aware Fuzzy Logic Based Handover Decision in Heterogeneous Wireless Networks
The ubiquitous services of wireless communication networks are growing
rapidly by the development of wireless communication technologies. While a user
is roaming from one cell to another cell, an intelligent decision mechanism and
network selection is extremely crucial to maintain the quality of service (QoS)
during handover. Handover decision must be made precisely to avoid any
unnecessary phenomenon like ping-pong, corner effect, call blocking, and call
dropping etc. This work considered service types like voice, video, and data
and their QoS requirements for handover decision using fuzzy logic in
heterogeneous network environment. Service is an important factor for the users
and particular service requires respective QoS. This paper provides all the
cases of handover decisions between macrocell and femtocell networks
considering service type. The proposed system models regarding these handover
decisions using fuzzy logic considering several input parameters e.g. received
signal strength indicator (RSSI), data rate, user's velocity, and interference
level (signal-to-noise plus interference ratio) to make handover from femtocell
to macrocell, macrocell to femtocell or femtocell to femtocell. The performance
of different parameters are shown based on service type are analyzed.Comment: International Conference on Electrical, Computer and Communication
Engineering (ECCE), Feb. 2017, Cox's Bazar, Banglades
Interference Declination for Dynamic Channel Borrowing Scheme in Wireless Network
In modern days, users in the wireless networks are increasing drastically. It
has become the major concern for researchers to manage the maximum users with
limited radio resource. Interference is one of the biggest hindrances to reach
the goal. In this paper, being deep apprehension of the issue, an efficient
dynamic channel borrowing scheme is proposed that ensures better Quality of
Service (QoS) with interference declination. We propose that if channels are
borrowed from adjacent cells, cell bifurcation will be introduced that ensures
interference declination when the borrowed channels have same frequency band.
We also propose a scheme that inactivates the unoccupied interfering channels
of adjacent cells, instead of cell bifurcation for interference declination.
The simulation outcomes show acceptable performances in terms of SINR level,
system capacity, and outage probability compared to conventional scheme without
interference declination that may attract the considerable interest for the
users.Comment: International Conference on Informatics, Electronics & Vision
(ICIEV), May 2014, Dhaka, Banglades
Radio Resource Management for Dynamic Channel Borrowing Scheme in Wireless Networks
Provisioning of Quality of Service (QoS) is the key concern for Radio
Resource Management now-a-days. In this paper, an efficient dynamic channel
borrowing architecture has been proposed that ensures better QoS. The proposed
scheme lessens the problem of excessive overall call blocking probability
without sacrificing bandwidth utilization. If a channel is borrowed from
adjacent cells and causing interference, we also propose architecture that
diminishes the interference problem. The numerical results show comparison
between the proposed scheme and the conventional scheme before channel
borrowing process. The results show a satisfactory performance that are in
favor of the proposed scheme, in case of overall call blocking probability,
bandwidth utilization and interference management.Comment: International Conference on Informatics, Electronics & Vision
(ICIEV), May 2014, Dhaka, Banglades
On Demand Cell Sectoring Based Fractional Frequency Reuse in Wireless Networks
In this paper, a dynamic channel assigning along with dynamic cell sectoring
model has been proposed that focuses on the Fractional Frequency Reuse (FFR)
not only for interference mitigation but also for enhancement of overall system
capacity in wireless networks. We partition the cells in a cluster into two
part named centre user part (CUP) and edge user part (EUP). Instead of huge
traffic, there may be unoccupied channels in the EUPs of the cells. These
unoccupied channels of the EUPs can assist the excessive number of users if
these channels are assigned with proper interference management. If the number
of traffic of a cell surpasses the number of channels of the EUP, then the cell
assigns the channels from the EUP of other cells in the cluster. To alleviate
the interference, we propose a dynamic cell sectoring scheme. The scheme
sectors the EUP of the cell which assigns channels that the assigned channels
are provided to the sectored part where these channels receive negligible
interference. The performance analysis illustrates reduced call blocking
probability as well as better signal to interference plus noise ratio (SINR)
without sacrificing bandwidth utilization. Besides, the proposed model ensures
lower outage probability
Group Handover Management in Mobile Femtocellular Network Deployment
The mobile femtocell is the new paradigm for the femtocellular network
deployment. It can enhance the service quality for the users inside the
vehicles. The deployment of mobile femtocells generates lot of handover calls.
Also, number of group handover scenarios are found in mobile femtocellular
network deployment. In this paper, we focus on the resource management for the
group handover in mobile femtocellular network deployment. We discuss a number
of group handover scenarios. We propose a resource management scheme that
contains bandwidth adaptation policy and dynamic bandwidth reservation policy.
The simulation results show that the proposed bandwidth management scheme
significantly reduces the handover call dropping probability without reducing
the bandwidth utilization.Comment: International Conference on Ubiquitous and Future Networks (ICUFN),
July 2012, Thailand. arXiv admin note: substantial text overlap with
arXiv:1412.432
Call Admission Control based on Adaptive Bandwidth Allocation for Multi-Class Services in Wireless Networks
Due to the fact that Quality of Service (QoS) requirements are not as
stringent for non-real-time traffic types, as opposed to real-time traffic,
more calls can be accommodated by releasing some bandwidth from the existing
non-real-time traffic calls. If the released bandwidth to accept a handover
call is larger than to accept a new call, then the probability of dropping a
call is smaller than the probability of blocking a call. In this paper we
propose an efficient Call Admission Control (CAC) that relies on adaptive
multi-level bandwidth-allocation scheme for non-real-time calls. The features
of the scheme allow reduction of the call dropping probability along with the
increase of the bandwidth utilization. The numerical results show that the
proposed scheme is able to attain negligible handover call dropping probability
without sacrificing bandwidth utilization.Comment: International Conference on ICT Convergence (ICTC), Nov. 2010, Jeju,
Korea,pp. 358-36
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