Analysis of back propagation and radial basis function neural networks for handover decisions in wireless communication

International Journal of Electrical and Computer Engineering (IJECE)
Vol. 10, No. 5, October 2020, pp. 4835~4843
ISSN: 2088-8708, DOI: 10.11591/ijece.v10i5.pp4835-4843  4835
Journal homepage: http://ijece.iaescore.com/index.php/IJECE
Analysis of back propagation and radial basis function neural
networks for handover decisions in wireless communication
Payal Mahajan, Zaheeruddin
Department of Electrical Engineering, Jamia Millia Islamia University, India
Article Info ABSTRACT
Article history:
Received Apr 8, 2019
Revised Mar 13, 2020
Accepted Mar 31, 2020
In mobile systems, handoff is a vital process, referring to a process of
allocating an ongoing call from one BS to another BS. The handover
technique is very important to maintain the Quality of service. Handover
algorithms, based on neural networks, fuzzy logic etc. can be used for
the same purpose to keep Quality of service as high as possible.
In this paper, it is proposed that back propagation networks and radial basis
functions may be used for taking handover decision in wireless
communication networks. The performance of these classifiers is evaluated
on the basis of neurons in hidden layer, training time and classification
accuracy. The proposed approach shows that radial basis function neural
network give better results for making handover decisions in wireless
heterogeneous networks with classification accuracy of 90%.
Keywords:
Back propagation networks
Handover
Neural networks
Quality of service
Radial basis functions Copyright © 2020 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Payal Mahajan,
Department of Electrical Engineering,
Jamia Millia Islamia University,
New Delhi, India.
Email: payal27mahajan@gmail.com
1. INTRODUCTION
Introduction to wireless communication. Wireless communication now a days is the part and parcel
of our lives since it offers elasticity and freedom of moving from place to a different while not losing
connectivity to the network. New interactive program services request rate of up to hundreds of megabits per
second and so bigger bands of frequencies are needed to keep up these new elevated data rate services.
On the contrary, to make mobile nodes move problem free, seamless handover is very important in these
networks [1]. VHO (vertical handover) algorithms are necessary for the development of the next Generation
HetNets i.e. heterogeneous networks [2]. Web consumers are assumed to possess worldwide affiliation
within the future web supported Next Generation networks. The ascension in the user request for knowledge
access actuated the employees too looked for improved Radio Access Technologies for delivering services to
the consumers additional expeditiously at higher speed. The well-established Third Generation network like
Universal Mobile Telecommunications System created it attainable to supply elevated quality level with
giant coverage however might supported solely low to medium rate that is insufficient to accomplish
applications that desires continuous internet connection [3].
For wireless communication, because of restricted information measure and getting a good service,
it's vital to lift the channel reuse ratio, thus an accessible and effective handover formula ought to be
developed [4]. Next gen wireless communication networks ought to guarantee the perpetually best connected
(ABC) to mobile user. The performance of wireless network is improved by using well-ordered handover
technologies once user is moving from one cell to a different [5]. This new era of communication involves
the interworking of the many technologies to confirm that the user is often connected with the world.
Relying upon the sort of application the user is running, different handover decisions are taken as an example
if a user is sharing knowledge on a social networking website, he would like to urge connected with

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Int J Elec & Comp Eng, Vol. 10, No. 5, October 2020 : 4835 - 4843
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the technology that give him with the identical facility with less latency and permit him to use the services
ceaselessly equally once he desires to hold an ongoing call he would like to urge connected to those
service [6]. Thus to permit the user to enjoy the continual services an improved handoff mechanism
is needed. Figure drawn below shows the interworking of various technologies. A new design concept,
i.e. the Heterogeneous Networks, was introduced in LTE to meet demand for both cellular network capacity
and coverage. HetNets ' idea is the deployment of several smaller cells under macro cell area to extend
coverage or increase capacity in some high - demand areas.
HetNets is a major change in the design of cellular networks, offering increase in network capacity
and enhanced coverage. HetNets refers to multi - access networks with the same UE (i.e. LTE with Wi-Fi)
and may refer to hierarchical sector structures where multiple cell structures with the same radio access
standards are used (macro cell). Recently, due to the rapid development of the current Internet and mobile
communications industry, mobile networking systems have been designed with greater infrastructure
complexity and greater diversity of associated devices and resources, as well as more dynamic networking
formations. In such emerging heterogeneous mobile networks (HetNets), there are a large number of
technical challenges over the complicated system resources focusing on the efficient management,
organization. The working of the efficient wireless communication system is the main focus these days.
Many authors have contributed in the improvement and innovation of the wireless communication systems.
In this work, we have suggested the use of Radial Basis and Back propagation neural tools for making
handover decisions. The results are deduced from the Matlab functions and it is seen that RBF works
efficiently than BPNN for making handover decisions in wireless heterogeneous networks. These three
features are covered by the Heterogenous wireless Networks:
- Intelligent and seamless network - wide access — HetNet can improve the network switching procedures
to deliver a seamless movement experience as users move between different Heterogeneous wireless
networks. Furthermore, HetNets can provide devices with the necessary network information to enable
authentication and access to various networks.
- Consistent Network Experience Quality — HetNets allow different networks to exchange information on
loads such as data traffic and latency. Such capabilities enable a mobile device to identify the network
that best suits the user's mobility needs. This results in a consistent quality of user experience across
multiple networks and better distribution of loads across different networks.
- Innovative and Dynamic Resource Management — two types of intelligence are involved in dynamic
resource management: spectrum agility and service agility. Reconfigurable radio with cognitive functions
and opportunistic access to the spectrum needs spectrum agility. On the other hand, service agility
requires virtualization techniques to circumvent computational networking issues. Collectively, dynamic
resource management allows scalable, re - configurable and adaptable networks.
A structure of diverse wireless access networks is Heterogeneous Wireless Network is shown in
Figure 1. With regard to coverage of network, technology, bandwidth, capacity, and network operator, VHO
is done [7]. A Vertical Handoff (VHO) occurred in such an atmosphere where a mobile terminal (MT) with
a number of network interfaces leave a wireless network and connects to other wireless network [8]. But on
what basis to perform, where to perform, when to perform the Vertical Handover are the key questions that
must be determined to carry out an efficient VHO for maximizing the supposed QoS (Quality of Service) and
QoE (quality of experience) perceived by the user [1]. Selection of suitable handover decision attribute and
assessment method play a vital role in this regard.
Figure 1. Heterogeneous wireless networks

Int J Elec & Comp Eng ISSN: 2088-8708 
Analysis of back propagation and radial basis function neural networks for handover .... (Payal Mahajan)
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Handover refers to the procedure when an Mobile Terminal(MT) change its attachment point from
one access point(AP) to other, as shown in Figure 2.
- Horizontal Handover
- Vertical Handover
Horizontal handover occur when a MT (mobile terminal) moves within the same wireless network
from one cell to another. Horizontal handoffs [9] can also be known as Inter-BSC handoff, Intra-BSC
handoff and Inter-Msc handoff in the cellular wireless system. The reasons for which horizontal handovers
are done are: poor signal quality (RSS) or signal loss, assignment of bandwidth, load balancing and Mobile
Terminal speed. The HHO (horizontal handover) process consists of three foremost steps: initiation of
the handoff, assignment of the channel, and execution of the handover / connection transfer [4].
Vertical handover can be done in three phases called Network discovery, Handover decision,
and execution of Handover. Network discovery is a process of finding the appropriate network in such a way
that the network meets user preferences with the required service quality [2]. Too early handover results in
redundant handover, while service quality is reduced as a result of late handover. Lastly, the transfer should
be executed at an optimal time. Several algos have been anticipated for vertical handover (VHO) mechanisms
on the basis of number of parameters, namely the received signal strength (RSS), connection costs, available
bandwidth, and speed of the mobile station, service quality, and signal to interference noise ratio, guarantee
delay of handover and battery consumption. The objective of the next generation communication systems is
to offer users, a large range of options [10].
Figure 2. Handover in heterogeneous networks
2. RELATED WORK
Many authors have contributed in the field of wireless communication. Some of the work which
helped us in this work are shown here. In [11], the authors gave a method by which selection of the optimum
target network from the available networks can be done. This approach is designed to maximize the degree
of customer satisfaction by selecting the "best" network among numerous candidate networks as
the handover target network. In [12], the authors showed that for smooth connectivity in heterogeneous
wireless networks, the main objective of handoff is choosing the best target network from the existing
network. To accomplish this goal, they designed a target network selection algorithm to improve the degree
of customer satisfaction. The technique focuses on a dwell time and estimation of the received
signal strength.
In [13], the authors suggested a DS-CDMA cellular network traffic model combining both soft
capacity and soft handover. Network output is then measured for the blocking of calls. In [14], the authors
showed that based on a pre-processed understanding of the performance profiles of the links, neural networks
essentially make important handoff choices with the assessment of the quality of the links, instead of
comparing the relative intensity of the signal. The results of the study and simulations showed that
the suggested algorithm enhances user-perceived quality in a VoIP application communication environment
by reducing both the amount of packet lost and unwanted handoffs. In [15], a handover algorithm is
proposed, and its output is studied in paper. Handoff decisions are usually based on signal strength, and many
artificial intelligence techniques such as Fuzzy Logic, ANN and so on are utilized lately.

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3. INTRODUCTION TO NEURAL NETWORKS TOOLS USED FOR HANDOVER DECISION
MECHANISM
In this paper, a comparison of handoff mechanism using different tools of neural networks is
presented. Here, Back propagation and Radial Basis Functions tools of neural networks are used and
a comparison between the efficiency of both the tools is presented depending upon their role in taking
the handover decisions with the use of matlab coding. In this section, an introduction to both the tools is
given and then in the next section a comparison between them is presented.
3.1. Back propagation neural network
Back propagation, a compression for "in reverse proliferation of errors", is a typical strategy to
train the artificial neural systems. From a perfect output, the system gains from various information sources
i.e. inputs, just like the manner in which a child figures out a way to acknowledge a dog. BPNN i.e. back
propagation neural network is a supervised learning strategy, and is a speculation of the delta rule.
BPNN needs a dataset of the perfect output for a few inputs that makes up the training set. It is most
useful for feed forward systems. Back propagation necessitates the activation operate used by artificial
neurons (or "hubs") be differentiable [9]. The target of a supervised learning algorithmic program is to
search a function which suits best, a collection of input to its precise output. Variety of input (i/p) and output
(o/p) pattern is effortlessly well-read by single-layer neural networks additionally referred to as perceptrons.
Though, these perceptrons can't be trained for many relatively simple patterns for example those who are
linearly indivisible. For instance, a human being will classify an picture of an animal by recognizing many
characteristics like the feel of the skin, (whether it's feathered, furry, scaled), number of limbs, the animal
size and lots of alternative characteristics [16].
A single-layered neural network, however must learn a function that outputs a label exclusively
using the intensity of the pixels within the image. A multi-layered network overcome this constraint because
it will turn out inner representations and get trained for various characteristics in every layer [1]. The primary
layer can be responsible for learning the orientations of lines victimisation the inputs from the each single
picture element within the image [17]. The second layer might join the options or characteristics learned
within the 1st
layer and obtain trained to acknowledge shapes like circles. With every higher layer, it learns
additional characteristics. The target and inspiration for development of the rear propagation algorithm
(BPNN) is to seek out a way to coach multi-layered neural networks such it will learn any random mapping
of input to output Differentiable activation functions [18].
The BPNN search the least value of the error function in weight space by using the gradient descent
method. The amalgamation of weights that reduces the error function is supposed to be an answer of
the learning problem. As the method needs calculation of the error function gradient at every step of iteration,
one should ensure the permanence and differentiability of error function. Apparently one need to utilize
a type of activation function apart from the step function which is used in perceptrons, because the composite
function created by consistent perceptrons is irregular. Out of all, the popular activation functions for back
propagation networks is sigmoid function [19]. sc: given by the expression
𝑠𝑐 (𝑥) =
1
1+𝑒−𝑐𝑥
The constant c may be chosen indiscriminately and its reciprocal 1/c is known as the temperature
parameter in random neural networks. The shape of the sigmoid changes in step when the value of c
increases. The higher the values of c, it brings the sigmoid shape like that of the step function and with
the limit c=1, the sigmoid converge to step function at origin.
Figure 3 shows architecture of back propagation. Multi-layer, Feed forward networks have
the features such as: They must have in any case one hidden layer. It should have units which are non-linear.
All layers must be connected between units in two sequential layers .It is not required that output units must
have input units equal in number. Number of Hidden units per layer does not depend upon the number of
input or output units [20].
3.1.1. Learning in back propagation networks
a. Learning in back propagation networks
Learning in back propagation networks: Weights initially take small and random values for each
training pair (input / output). Each input unit transmits its value to every hidden unit. Every hidden unit sets
its input signal and activates its output signal calculation function.

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b. Back propagation stage
Each output calculates its term of error, its own term of weight correction and its term of correction
and sends it down to the layer below. Every hidden unit sums up its delta input from above and multiplies by
its activation function derivative; it also calculates its own weight correcting and bias correcting term.
c. Adjusting the weights
Each output (o/p) unit updates firstly its weights and then bias and every hidden unit updates its
weights and then bias term. Every training sequence is known as an epoch. The weights are reorganised in
every cycle
Figure 3. Architecture of back propagation
3.2. Introduction to radial basis functions
Moody and Darken and Broom head and Lowe, were the first persons to make use of the radial basis
function (RBF) in the system of neural networks (NN). RBF networks are the feed-forward networks
practiced with the use of supervised training algorithm. These are mostly well-ordered with an individual
hidden layer of units whose activation function is carefully selected among a cluster of functions known as
basis function. Though they are similar to BPNN in many structures, Radial Basis Function networks has
a number of advantages. They generally learn faster than BPNN. Radial basis functions are recent ways of
approximating several multi variable functions. They have been recognized, examined and tested for several
years now [21]. The hidden units offer functions that situate a random base for the input design [22]. There is
a non-linear conversion from input space to hidden unit and linear conversion from hidden unit to the output
unit. The hidden layer functions produce significant non-zero response only at times the input drops within
a slightly limited region of the input [23]. Every hidden unit has its separate receptive field in input
space [24]. The architecture of Radial Basis Functions is displayed in the following Figure 4.
Figure 4. Architecture of radial basis function

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The main features of RBF are [25]:
- These are two layered feed-forward networks.
- The hidden nodes provide a set of Radial Basis Functions (e.g. Gaussian functions).
- The output nodes provide linear concise functions as in BPNN.
- The network training have two stages: firstly the weights from the input layers to hidden layer are
specified, and then the weights from the hidden layer to output layer are specified. The training is really
fast. These networks are better for doing interpolation.
3.3. Difference between the two tools
Comparison in the performance of BPNN and RBF networks fascinated the thoughtfulness of
the many researchers. Many researchers found that the RBF defeated the BPNN in recognition of voice while
some other researchers found that Multi-layer perceptron i.e. BPNN is superior to RBF in fault tolerance and
allocation of resources applications [26]. Additionally approving the very fact that BPNN with sigmoid
activation function is superior for classification applications [27]. BPNN with sigmoid activation didn’t
solely attain the simplest mean sq. error, however conjointly wished the minimum training time in on-line
learning in all datasets [28]. Apart from the similarities of topologies, RBF networks and BPNN performs in
a unique way. RBF networks are modest than BPNN which might have more than 3 layers, so the training
method is usually quicker than BPNN. It is vital to fix accurate early states for RBF networks whereas BPNN
use arbitrarily created parameters primarily [21]. The classification procedures for RBF networks and BPNN
are totally different. The RBF network primarily based models are linear in parameters and thus assure
convergence to their ideal values for specific network architecture. Growth of the RBF network model so
needs fewer samples and fault and thus, a smaller amount of time and effort, than that desired by BP
approach [29].
4. PROPOSED APPROACH
In this paper, handover technique based on two different tools of neural networks is shown and
the best among them is selected. When the results for both the tools were drawn, it was seen that RBF is
better than Back propagation of neural networks in many aspects. Let us explain this from the results and
simulations of the tools. We are using two methods of neural networks i.e. Back propagation neural networks
(BPNN) and radial basis function (RBF) neural network method for handover decisions in wireless
communication networks.
Results of implementation have been summarized in the Table 1. From the Table 1, it is seen that
classification accuracy and training time increases with increase in number of neurons in hidden layer in case
of both BPNN and RBFNN. Table 1 show that classification accuracy of RBFNN is better than BPNN but
the time taken by RBF is more than that of BPNN. When number of hidden layer neurons are 50 for given
dataset of 2500 training input samples, corresponding classification accuracy for BPNN is 88% and training
time is only 0.32 minutes and accuracy of RBFNN is 58% , training time is 0.06 minutes . But when number
of hidden layer neurons increases to 500, classification accuracy for BPNN is 83% and training time
increases gradually to 2 minutes and 27 seconds corresponding accuracy in case of RBFNN is 90 and time
taken is 11 minutes and 55 seconds. When number of hidden layer neurons increases to 500, accuracy of
RBFNN increases and its corresponding value of MSE decrease (0.03). The results for the neural network
tools are calculated after running the MATLAB codes assigned to back propagation and Radial Basis
functions respectively. These codes are given in the appendix. Table 1 gives the performance of both
the tools discussed above.
Table 1. Showing comparison between the training times calculated using RBF and back propagation
Serial
number
number of
neurons
Accuracy
BPNN (%)
Accuracy
RBF (%)
Training time
BPNN in minutes
Training Time
RBF in minutes
1 50 80 58 00:32 00:06
2 100 79 64 00:50 00:11
3 150 81 68 00:56 00:19
4 200 83 71 01:07 00:28
5 250 79 78 01:18 01:57
6 300 87 81 01:30 03:53
7 350 82 85 01:42 05:43
8 400 79 86 01:53 07:42
9 450 83 88 02:15 09:55
10 500 83 90 02:17 11:55

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Figure 5 shows an important parameter which helps in deciding the best handover decisions. In this
era where all the technologies are interworking time management in handover decisions is very important.
As the user today wants to enjoy the uninterrupted services while moving from one place to another.
The graph drawn above proves that the time taken by RBF in handover is practically not realisable as there is
a pause of up to twelve minutes for 500 neurons. In the meantime, all the services to which the user is
connected are at a halt whereas the maximum time taken by the BPNN networks for maximum number of
neurons is four minutes for 500 neurons. Though the efficiency provided by RBF is much more than that of
BPNN but the fact cannot be neglected that the time taken by RBF is very large.
Figure 5. Training time for BPNN and RBF
The Figure 6 shows the comparison between the accuracy of RBF and BPNN and it is clearly shown
that the efficiency of RBF is better than that of BPNN. For 500 neurons the accuracy for RBF reaches up to
90% whereas that of BPNN is just 83%.In taking handover decisions, accuracy plays a vital role. Accuracy in
case of handover means how accurately the handover decisions are taken when user enters the coverage area
of new base station or the user intends to make use of other services rather than that service which he is
currently using.
Figure 6. Graph between classification accuracy of RBF, BPNN v/s number of neurons
5. CONCLUSION
The handover decisions can be taken using conventional sources and soft computing techniques.
In this paper, it is shown that when the neural network tools BPNN and RBF are used for taking handover
decisions, RBF networks is proved to be better than BPNN in terms of accuracy but time taken by RBF is
much more than that of BPNN. The performance of these classifiers is evaluated on the basis of number of

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neurons in hidden layer, training time and classification accuracy. This paper shows that RBF neural network
gives better results for handover decision in wireless communication networks with classification accuracy of
90%. Thus, it can be concluded that though RBF provides more accuracy but it takes a huge time for making
the decisions. The future work suggested in this paper are other neural network techniques which can
practically make possible the use of neural networks in handover decisions and these techniques can be C4.5
decision tree, Nave Bayes, Bayes net.
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BIOGRAPHIES OF AUTHORS
Payal Mahajan, Research Scholar in Department of Electrical Engineering, Jamia Millia
Islamia University. Research interests: fuzzy logic, wireless communication, mobile networks,
neural networks, optimization techniques. Email: payal27mahajan@gmail.com
Prof. Zaheeruddin, Senior professor in Department of Electrical Engineering, Jamia Millia
Islamia University. Research interests: fuzzy logic, soft computin, mobile networks, artificial
Intelligence neural networks, optimization techniques. Email: zaheeruddin@jmi.ac.in

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