=Paper=
{{Paper
|id=Vol-2403/paper9
|storemode=property
|title=Multi-Criteria Decision Making Approaches for Choice of
Wireless Communication Technologies for IoT-Based Systems
|pdfUrl=https://ceur-ws.org/Vol-2403/paper9.pdf
|volume=Vol-2403
|authors=Hanna Krapivina,Yuriy Kondratenko,Galyna Kondratenko
|dblpUrl=https://dblp.org/rec/conf/icteri/KrapivinaKK19
}}
==Multi-Criteria Decision Making Approaches for Choice of
Wireless Communication Technologies for IoT-Based Systems==
https://ceur-ws.org/Vol-2403/paper9.pdf
Multi-Criteria Decision Making Approaches for Choice of
Wireless Communication Technologies for IoT-Based
Systems
Hanna Krapivina[0000-0002-3568-7944], Yuriy Kondratenko[0000-0001-7736-883X],
Galyna Kondratenko[0000-0002-8446-5096]
Intelligent Information Systems Department, Petro Mohyla Black Sea National University,
68th Desantnykiv Str., 10, Mykolaiv, 54003, Ukraine,
anya.krapivina@gmail.com, yuriy.kondratenko@chmnu.edu.ua,
halyna.kondratenko@chmnu.edu.ua
Abstract. In this paper, several methods and approaches for multi-criteria selec-
tion of wireless communication technologies for Internet of Things (IoT) sys-
tems are analyzed. Their comparative analysis allows to choose the most appro-
priate multi-criteria method for increasing the efficiency of decision-making for
different input data and various functioning conditions of IoT-based systems.
The multi-criteria task of choosing a wireless communication technologies is
definitely complicated and important because the decision-making process can
be influenced by various types of criteria. Authors discuss in detail the simula-
tion results and advantages of multi-criteria selection of wireless communica-
tion technologies based on the methods of linear, Max-Min and multiplicative
convolution and the ideal point method with different metrics (Euclidean,
Hamming and Chebyshev) with the study of the influence of current methods on
the decision making efficiency.
Keywords: wireless communication technology, IoT, decision-making, multi-
criteria approach, ideal point method.
1 Introduction
Decision-making always involves choosing one of the possible options making deci-
sions. These possible options are called alternatives. Problem situations must have at
least two options. That is, at least two alternatives are needed to create a decision-
making task. Independent alternatives are alternatives, actions which do not affect the
quality of other alternatives. Dependent alternatives are decisions on one of them af-
fect the other [1-3].
Sometimes all alternatives are given in advance and you just have to select from
them. The peculiarity of such tasks lies in a closed and non-expanded number of alter-
natives. But there are tasks in which all alternatives or part of them are not formed
before the decision is made. Often on the basis of such alternatives in the process of
selection, new alternatives or a set of requirements to existing alternatives arise. This
task class calls tasks with constructive alternatives [1].
When there are many alternatives, the decision maker (DМ) cannot devote enough
time and attention to analyze each of them. So there is a need for tools to support
choosing (making) decisions. In the modern decision-making theory, it is considered
that variants of solutions are characterized by various types of their attractiveness for
DM [1, 2, 4]. These indicators are called attributes, factors or quality metrics. All of
them serve as criteria for choosing a solution. The number of criteria are usually more
than one in different theoretical constructions and decision methods. Modern methods
of decision-making take into account all the special qualities of alternatives that sig-
nificantly brings formal schemes to the real world. Therefore, now a multi-criteria
description is becoming more popular in use. Usually, evaluation criteria are not given
at the beginning of the analysis of the problem. They are established by DM and ex-
perts [1].
2 Related Works and Problem Statement
Recently, wireless data transmission has become increasingly popular. The wide-
spread use of wireless networks is due to the fact that they can be used not only on
personal computers, but also on phones, tablets and laptops, at a reasonable price,
convenience and provide sufficient data transfer speeds for most applications. The
main advantage of wireless networks is the permission to implement a network project
in the short term and reduce the cost of creating a system [5, 6].
The task of choosing a wireless data transfer (communication) technology is defi-
nitely relevant as the decision-making process can be influenced by various types of
criteria, in particular, the quality and power of the data signal, the security of the tech-
nology, energy efficiency, etc. In most cases, the choice of wireless data technology is
reduced to a comparative analysis of their capabilities and pricing policies. In this
case, IoT developers often prefer well-known wireless data technologies, without
taking into account the criteria (factors) that may affect the development, mainte-
nance, updating, reliability, security and scaling of developed IoT systems in the fu-
ture. Incorrectly selected technology can lead to various losses [5, 7, 8].
Let's consider several wireless communication technologies: ZigBee ( E1 ), Wi-Fi
( E2 ), Bluetooth ( E3 ), Z-Wave ( E4 ), WiMAX ( E5 ), Classic WaveLAN ( E6 ). Each of
these technologies has its advantages and disadvantages.
ZigBee ( E1 ) technology for wireless sensory and personal networks. The ZigBee
technology provides low power consumption and data transfer at a non-licensed 2.4
GHz frequency (different countries may vary in frequency) up to 250 KB / s, up to 75
meters in direct line of sight. One of the advantages and disadvantages of technology
at the same time is its complexity [9, 10].
Wi-Fi ( E2 ) is a trademark of the Wi-Fi Alliance association, which is a standard
set of standards for IEEE 802.11 for broadband radio communications. Depending on
the standard, Wi-Fi uses a data bandwidth of 2.4 GHz or 5 GHz. The main disad-
vantage of Wi-Fi compared with competitors is relatively higher power consumption
[5, 11, 12].
Bluetooth ( E3 ) low-bandwidth radio communication technology (typically up to
200 meters) in the unlicensed frequency band (ISM range: 2.4-2.4835 GHz). One of
the easiest ways to connect two devices. To communicate between devices, only a
Bluetooth adapter is required. Relative versatility is both an advantage and a lack of
Bluetooth [6, 13-15].
Z-Wave ( E4 ) is a compatible wireless technology for managing and monitoring
applications for residential and commercial environments [4]. The main purpose of
Z - Wave is to provide reliable transmission of short messages from the control unit
to other network nodes [10]. The Z-Wave network allows you to use the full-type
topology without the need for a coordinator [5, 17, 18].
LTE ( E5 ) is a standard for wireless broadband communication, based on the
GSM/EDGE and UMTS/HSPA technologies. It increases the capacity and speed using
a different radio interface together with core network improvements. Its main features
are peak download rates up to 299.6 Mbit/s and upload rates up to 75.4 Mbit/s de-
pending on the user equipment category (with 4×4 antennas using 20 MHz of spec-
trum); five different terminal classes have been defined from a voice-centric class up
to a high-end terminal that supports the peak data rates; all terminals will be able to
process 20 MHz bandwidth; support of at least 200 active data clients in every 5 MHz
cell [5, 6, 10].
Classic WaveLAN ( E6 ) is used to organize local networks (a wireless alternative
to wired networks Ethernet and Token Ring). Data transmission is carried out in the
frequency range of 900 MHz or 2.4 GHz, while the transmission speed is up to 2
Mbps [19-21].
The following criteria for choosing a wireless data technology were selected.
Data transfer rate ( Q1 ). The average number of bits, characters, or units transmit-
ted per unit time between two corresponding data transfer system devices [5].
Frequency Range ( Q2 ). Frequency band limited by certain values [6].
Technology Definition ( Q3 ). Alert for unauthorized access or damage to IoT de-
vices using a wireless network [8, 10].
Number of nodes ( Q4 ). The typical wireless network infrastructure consists of
several access nodes. These nodes are connected to the network by means of wires
and form the hidden-minded users of cities for wireless clients. Wireless clients are
client devices (say, laptops, desktops, or pocket computers) [5, 11].
Range of action ( Q5 ). Maximum distance between transmitter and receiver [10].
Energy Efficiency ( Q6 ). Effective (rational) use of energy reserves. Wireless sen-
sor networks can be used to monitor energy efficiency [13].
The multi-criteria problem can be formulated on the basis of developed criteria
and a set of alternative solutions, and can be solved by one of the appropriate methods
of multi-acceptance of pinning, in particular by the methods of coagulation (linear,
Max-Min, multiplicative) and the ideal point method [1-3, 22, 23].
3 Methods of Multi-criteria Selection of Wireless
Communication Technology
The analysis of many real practical problems naturally led to the emergence of a class
of multi-criteria problems. The solution of the corresponding problems is through the
use of such methods as selection of the main criterion, linear, multiplicative and Max-
Min convolutions, the ideal point method, the method of sequential concessions, lexi-
cographic optimization. Most of the methods of multi-criteria decision-making pro-
vide a multi-criteria problem for a one-tiered one, which greatly simplifies the deci-
sion-making process [1, 24-26].
The task of choosing a wireless data technology can be presented in the following
form (decision matrix):
Q1 E1 Q1 E2 Q1 Em
Q E Q2 E2 Q2 Em
Q Ei 2 1 ; E E; i 1, 2,, m; j 1, 2,, n , (1)
i
Qn E1 Qn E2 Qn Em
where Q Ei is the vector criterion of quality of the i-th alternative; Q j Ei is the
j-th component of the vector criterion of quality Q Ei .
The evaluation of the i-th alternative for the j-th criterion Q j Ei has a well-
defined scale of evaluation and is formed by experts based on their experience,
knowledge and experimental research in the field of wireless data transfer technology
between devices in IoT networks [1-3, 25, 27].
To solve the problem of choosing a wireless data technology, you need to find the
best alternative E * based on the input data (1):
E * Arg max Q Ei , Ei E; i 1, 2,..., 6 . (2)
i 1,2,, m
All methods for solving multi-criteria optimization problems are based on the con-
struction of an initial problem with a vector criterion to an optimization problem with
a scalar criterion. The methods themselves differ only by the mechanism of realization
of such an assembly. Let's consider the convolution methods: linear, max-min, and
multiplicative of partial criteria [1, 3, 27-29].
The simplest and most widespread way of combining the original criteria is based
on the use of a linear convolution that has the form [1, 30]:
n n
Q Ei j Q j Ei Max; Ei E; j 0; j 1; i 1, 2,, m , (3)
j 1 j 1
where j is the weight coefficient reflecting the relative importance of the j-th criteri-
on Q j Ei .
Most methods of multi-criteria decision-making are based precisely on the applica-
tion of this method. The reasons for this are the simplicity and visibility of the meth-
od. Weights can be considered as indicators of the relative importance of each criteri-
on [1, 25, 29, 30].
More versatile, from the point of view of the application area is the Max-Min con-
volution, which has the form [1, 25]:
n
Q Ei min j Q j Ei Max; Ei E; j 0; j 1 . (4)
i 1,2,...,m
j 1
Another variant of the scalarization of the criteria is the multiplicative convolution
[1, 3, 25, 30]:
Q Ei Q j Ei Max; Ei E; j 0; j 1; i 1, 2,, m .
n n
j
(5)
j 1 j 1
In this case, the main feature of the application of these methods is the choice of a
method for the formation of weight coefficients j . This significantly influences the
choice of the optimal solution E * [30-32].
The name of the method of an ideal point is due to the fact that when it imple-
ments, the DM specifies certain target values for each partial criterion. Within the
framework of the method, the assumption is made that the so-called "ideal point" ex-
ists in the space of the criteria [1, 3, 30]:
Q*j max Q j Ei ; Ei E; i 1, 2,m; j 1, 2,n , (6)
i1,2,,m
where Q *j is the optimal solution of the j-th criterion.
These optimal solutions will serve as coordinates of the ideal point in the criteria
space [1, 30]:
Q* Q1* , Q2* ,, Qn* , (7)
where Q * is an ideal point.
If the ideal point is permissible (but this happens very rarely), the decision is con-
sidered to be received. Otherwise, it is necessary to determine the distance to the ideal
point. To do this, you need to select a metric, and finally solve one criterion problem
of finding a point from the set of permissible solutions, which is closest to the ideal
[1]. The optimization task looks like this:
d p Ei p Q Ei Q* Min; Ei E; i 1, 2,m, (8)
where d p Ei is the distance between the ideal point and the i-th alternative Q Ei ;
p is the metric of distance measurement.
If the Euclidean metric is chosen, then distance (8) has the form [1]:
Q E Q Min; E E; i 1, 2,m, j 1, 2,n .
n
d p Ei j i
* 2
j i (9)
j 1
If the Heming Metric is selected, then distance (8) has the form [1, 4]:
n
d p Ei Q j Ei Q*j Min; Ei E ; i 1, 2,m, j 1, 2,n . (10)
j 1
If the Chebyshev metric is chosen, then distance (8) has the form [1, 30]:
d p Ei max Q j Ei Q*j Min; Ei E; i 1, 2, m, j 1, 2, n . (11)
i 1,2,, m
4 An Example of Multi-criteria Choice of Wireless
Communication Technology Using Convolution Methods and
Ideal Point Method
Experts are encouraged to evaluate alternative solutions according to the indicated
criteria using the 10-point rating scale (from 1 to 10), where 10 points correspond to
the largest (better) value of the alternative solution by the criterion [30]. Consider an
example of expert assessments for this task in Table 1.
For this example, we use the direct evaluation method, that is, the expert himself
determines the importance of each criterion. Table 2 shows the weight coefficients for
each criterion using simple ranking method [1, 30].
Table 1. The decision matrix for the choice of wireless communication technology
E1 E2 E3 E4 E5 E6
Q1 6 9 8 9 10 8
Q2 8 8 7 9 8 6
Q3 7 8 6 8 6 7
Q4 9 4 9 7 7 9
Q5 10 7 8 5 8 6
Q6 8 9 4 8 10 9
Table 2. Weight coefficients ( j ) of criteria
Q1 Q2 Q3 Q4 Q5 Q6
j 0.28 0.22 0.22 0.07 0.14 0.07
Calculate with a linear convolution method (3):
Q E1 6 0.28 8 0.22 7 0.22 9 0.07 10 0.14 8 0.07 7.57;
Q E2 9 0.28 8 0.22 8 0.22 4 0.07 7 0.14 9 0.07 7.93;
Q E3 8 0.28 7 0.22 6 0.22 9 0.07 8 0.14 4 0.07 7.13;
(12)
Q E4 9 0.28 9 0.22 8 0.22 7 0.07 5 0.14 8 0.07 8.01;
Q E5 10 0.28 8 0.22 6 0.22 7 0.07 8 0.14 10 0.07 8.19;
Q E6 8 0.28 6 0.22 7 0.22 9 0.07 6 0.14 9 0.07 7.2.
In this way (12), the best alternative is E5 (LTE).
Calculate with Max-Min convolution (4). In this case (Table 3), the best alterna-
tive is E6 (Classic WaveLAN).
Table 3. Results of using Max-Min convolution
E1 E2 E3 E4 E5 E6
Q Ei 0.56 0.28 0.28 0.49 0.49 0.63
Calculate using multiplicative convolution (5). In this case (Table 4), the best al-
ternative is E5 (LTE).
Q E1 60.28 80.22 70.22 90.07 100.14 80.07 7.46;
Q E2 90.28 80.22 80.22 40.07 70.14 90.07 7.79;
Q E3 80.28 70.22 60.22 90.07 80.14 40.07 7.0;
(13)
Q E4 90.28 90.22 80.22 70.07 50.14 80.07 7.87;
Q E5 100.28 80.22 60.22 70.07 80.14 100.07 8.04;
Q E6 80.28 60.22 70.22 90.07 60.14 90.07 7.12.
Calculate using ideal point method. Find the coordinates of the ideal point as the
maximum values (6) of all the criteria.
Consequently, the ideal point (7) in the criterion space has the following coordi-
nates:
Q* Q1* , Q2* , Q3* , Q4* , Q5* , Q6* 10,9,8,9,10,10 .
The ideal point is not equivalent to any of the alternative solutions; therefore, it is
necessary to find the distance between the alternatives and the ideal point (8) using the
different metrics. An alternative with the smallest distance will be optimal.
Calculate the distance using the Euclidean metric (9) from the E1 to Q * :
d p E1 6 10 8 9 7 8 9 9 10 10 8 10 4, 69 .
2 2 2 2 2 2
Calculate the distance using the Heming metric (10) from the E1 to Q * :
d p E1 6 10 8 9 7 8 9 9 10 10 8 10 8.0 .
Calculate the distance using the Chebyshev Metric (11) from the E1 to Q * :
d p E1 Max 6 10 , 8 9 , 7 8 , 9 9 , 10 10 , 8 10 4.0 .
The distances for all alternatives are given in Table 4.
Table 3. Comparison of the distances for all alternatives based on the metrics of Euclidean,
Haming and Chebyshev
E1 E2 E3 E4 E5 E6
Euclidean metric 4.69 6.08 7.21 5.83 3.61 5.57
Heming metric 8 11 14 10 7 11
Chebyshev metric 4 5 6 5 2 4
According to Table 3 the minimum distances are 3.61, 7 and 2. All indicators refer
to the alternative E5 (LTE).
So, the results by the convolution methods (3), (4), (5) and the ideal point method
with different metrics (9), (10), (11) lead to the optimal alternative E5 (LTE).
5 Conclusions
Nowadays, there are many varieties of wireless communication technologies, both
in terms of typology and in terms of their personal capabilities, characteristics. There
is a problem of rational choice of technology for a certain IoT system taking into ac-
count the criteria (factors) that affect the result of the evaluation. This technique
avoids various losses in the subsequent work of the IoT system due to improperly
chosen technology.
In this paper, such methods as linear, Max-Min, and multiplicative convolutions
and the ideal point method with different metrics (Euclidean, Hamming and Cheby-
shev) were considered.
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