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RESEARCHES EFFICIENCY FUNCTIONING SYSTEMS PROCESSINGS INFORMATION FLOWS AUTOMOBILE SERVICES
DOI 10.24411/2072-8735-2018-10272
Bayram G. Ib^himov,
Azerbaijan Technical University (AzTU) Baku, Azerbaijan, i.bayram@mail.ru
Aziz M. Talibov,
Military Academy of the Armed Forces of the Republic of Azerbaijan, Baku, Azerbaijan, a.talibov@mail.ru
Keywords: information processing systems, reliability, performance, fault tolerance, quality of service, security risk, average queue length.
In this article, the subject research is the efficiency of the processing systems information flows automotive service based on the architectural concept subsequent communication network using modern information technologies. As a criterion for the effectiveness of the functioning of the systems, the performance information processing systems was chosen. The latter characterizes the following complex indicators as the capacity of the hardware and software system when exchanging various types messages, the probability-time characteristics useful and service transport traffic, the reliability of the automotive service systems, and the protection information from unauthorized access to subscriber communication lines. The purpose this work is to study and analyze the effectiveness of the functioning of the information processing systems automotive service using next generation network technologies. As a result of the study, a mathematical model was proposed, which takes into account the nature of the transm?tted transport traffic and the presence multiple network resources, based on the performance indicators of the information processing systems. Analytical expressions are obtained, allowing to evaluate the indicators quality of service, information security and fault tolerance of the functioning of the system during the transfer various traffic. Based on numerical calculations, a graphical dependence of the average queue length of packets on the value of the system load factor was constructed. The graphical dependencies showed that the availability network resources leads to a significant improvement in the performance characteristics information flow processing systems.
Information about authors:
Bayram G. Ibmhimov, Doctor of Technical Sciences, Professor, Department of " Telecommunication systems and information security", Azerbaijan Technical University, Baku, Azerbaijan
Aziz M. Talibov, Ph.D., Professor, Military Academy of the Armed Forces of the Republic of Azerbaijan, Baku, Azerbaijan
Для цитирования:
Ибрагимов Б.Г., Талыбов А.М. Исследования эффективности функционирования систем обработки информационных потоков автомобильных служб // T-Comm: Телекоммуникации и транспорт. 2019. Том 13. №5. С. 56-60.
For citation:
Ibrahimov B.G., Talibov A.M. (2019). Researches efficiency functioning systems processings information flows automobile services. T-Comm, vol. 13, no.5, pр. 56-60.
1. Introduction
At the present stage development of the network infrastructures of the digital economy and ihe creation strategic plans for the "Dtgitalization Roadmap" require rational organization and management of transport companies' resources, ensuring the efficiency processing information systems for automotive services lit 2].
As a criterion for ihe effectiveness of the functioning of the system, the performance of information processing systems was chosen, which characterizes the following complex indicators [3, 4,5]:
• Capacity of the hardware and software system when exchanging various messages;
• probability-time characteristics of useful and serv ice transport traffics;
• reliability of the automotive services system;
• protection of information from unauthorized access of subscriber communication lines.
Therefore, the task of analyzing the above indicators of the efficiency of the transmission system and the processing of information flows of automotive services, using advanced information technologies and next generation network concept protocols are the most relevant.
!ii |t, 3, 6|. methods for improving the characteristics of the bandwidth capabilities of a hardware and software system and algorithms for protecting information from unauthorized access were analyzed.
In [7, 8], the quality of functioning information processing systems automobile services was investigated using the architectural concept and next generation network technologies, and their main network ant! channel indicators were identified.
However, the task researching integrated indicators of the efficiency processing information systems automotive services in the exchange of useful and service transport tin flics has not yet been fully resolved.
in this paper, we consider the solutions of the problem formulated above- the study and evaluation of the efficiency of the processing systems information flow automotive services,
2. General formulation of the problem
and the construction of a mathematical model
To assess the performance indicators of the system for processing information flows of automotive services, it is necessary to develop a mathematical model (MM) that takes into account the nature of the transmitted traffic and Ihe presence of multiple network resources.
It was established (4, 9, 10. II) that the studied message processing systems are a queuing system (QS), which, according to Kendall coding, correspond to a common type M IGIM Nh
with one serving terminal server.
Assume that the incoming packet flow in the service system has Poisson oob ove distribution laws with a parameterA^ the
duration of the service of the traffic has an arbitrary distribution function B (t) with moments bj.
We assume that during critical loading pi <1. f=l,/i, the number of waiting places in the system is limited to /V,„ Then, the studied MM is a single-channel genera! type queuing system M IG /1 / N h with limited queues.
The investigated system performance is determined by the number transmitted traffic packet streams per unit time under the conditions of a given reliability and information security, which are functionally described by the following dependency:
en
where N^J A^ ) - the average waiting time of a packet in the service queue in the system, taking into account the raLe of incoming flow Af in processing the/—th traffic, / = ],/); PA A ) -system performance of hardware and software, taking into account the rate of incoming flow Xi during processing i - tli
traffic, / = ),«; K, - fault tolerance factor of hardware and software during stream processing ; - th traffic, / = I,n\Il - information security coefficient of the functioning of hardware and software when processing the (low th traffic. / - 1,n; C1 - band widths of system hardware and software during stream transmission I - th traffic, ( C = C, n№ ),/-!, n.
The mathematical formulation of the task of the proposed MM for assessing the performance indicators of the information processing systems of automotive services is described by the following functional traffic conversion:
U}
c <c,
I. < I
î— 1,/? i = 1,11
with the following restrictions
riiisrfu,), m)<P'""(A>, / = M
K. > K..
i = 1
(,/JV.
(2)
(3)
where paket delay time from Hie moment its arrival to
the moment of sending, taking into account the speed incoming llow ; A) — probability of a denial of service to a packet
of incoming traffic; Tdp"(A,),P'\ M^Aj), C;iV, K:pY
and / - respectively, the allowable Value of the packet delay
time, the probability failure, the average waiting time of a packet in the system service queue, throughput, fault tolerance, and information security of the software and hardware transport services when transmitting the / — th stream of packets, i — I, n.
Expressions (2) and (3) define the essence of the new approach under consideration, taking into account the intensity transport traffic, on the basis which MM is proposed to analyze the performance indicators of the information systems processing automotive services.
3. Research indicator fault tolerance of the information processing system In [6], it was revealed that one of the important performance criterion of information processing systems is the coefficient preserving the fault tolerance of the functioning of the system fi ., / = 1 determinant reliability indicators:
K, = F[PR,(Aj),P{\),PuAt.A)], i = \,n
(4)
Bused on the study [2, 6]. il was found that the fault tolerance indicators are determined by (lie choice means to ensure tlie reliability active functional blocks both switches and controllers using NGN protocols, firewalls, and network server groups. These are important and functional compositions hardware and software of the information flow processing system.
Consider one of the options foT assessing the reliability of the systems, consisting of a single network server that serves i - th traffic flow packets. The evaluation of the reliability of the systems is performed using a well-known mathematical apparatus |4|:
= (5)
f=i
where P p (/, A)- probability of system uptime, i =
A - failure rate of network switching nodes, (s1).
Expression (5) characterizes the fault tolerance of the functioning of the system with the failure rate A of the hardware and software of the system.
Therefore, if you know the density of the time distribution of a random process of changing parameters, the reliability of the system in the health domain in the time interval |0. Tj. then the probability P(A) failure during the lime T is determined by the
following integral ¡4, 9]j
r
P(^=\p,M)iit (6)
0
where p (/)- distribution density of the uptime of the system
hardware and software.
Given the number of switching nodes network and availability. the probability of failure of hardware and software while maintaining the functioning of the system, is expressed as follows:
where K, (A)- availability factors of the system hardware and software and is expressed as
Kr(\) = \hK\ + \h), (8)
Where A,, — the intensity of the recovery of the hardware and
software of the system.
Formula (7) and (S) characterizes one of the most important indicators of the system fault tolerance ratio Kf, i- 1,/; given the Load factors of the nodes of hardware and software when processing information flows of useful Ailt and service Ati traffic, which is the expression;
pt*ifiV(Mi , / = (9)
where - the rate of service of the go /-th traffic stream and is =
Expressions (9) also determine the coefficient of the effective use of the system's hardware and software when servicing the information i — th traffic flow automobile serv ices.
The numerical calculations of the parameters of the probability of failure-free operation of the hardware and software nodes with different system load factors p] =0,50 and p, =0,70.
Analysis of the calculation shows that in the case of an increase in the failure rate, when the intensity of the service channel load y(((jl)<0,40 Erlanq, probability failure
/'(A) =0,050, probability of system recovery P ~ 0,950 and C: =(155.....200)Mbps, the probability trouble-free operation of the system is significantly reduced.
It follows from the calculation that its noticeable change begins With the values A > 125 s"1.
Thus, from expression (5),...,(8} and the above calculations, it follows that an increase in the failure rate leads to a deterioration in the fault tolerance of the system /7 < 0,65, and thereby
worsens the protection information from unauthorized access subscriber and network lines communication m general.
4. Analysis and protection of information in the information processing system
It is known [2, 7] that the spread of information technology NGN has given a lot of new opportunities in transport, business, science and life. However, methods of fraud, theft and substitution of information have evolved along w ith this.
In a system with an increase in the number of information technologies, the need to ensure information security in the transfer of useful and service transport traffic is growing [2,5J.
Considering possible unauthorized access and cyber threats, the safety factor of software and hardware functioning If (At) when servicing the flow / - th traffic packets is expressed by:
/'u,) = = CO)
Where ifULf)- hazard ratio of the systems for serv icing the
first (low i - th traffic packets with intensity A., i - I, n.
Expression (10) assesses the level information protection against the likelihood of information security threats in case of unauthorized access in the systems.
5. Estimation average packct watting time in the service queue
Based on the analysis of the model M !G N h, it has been
revealed that one of the key characteristics for evaluating systems performance is the average waiting time for a package in the service queue E[.\' tJA:)] e in the sistem |t>, 10].
Taking into account the Polacek-Khinchin formula, the average waiting time of a packet in the service queue in the systems, taking into account the incoming How rate AI when processing /-th traffic, is determined by the following expression |7];
£[;V„„ (A,)] -- + ■ (UC;) • E[f, ]- i=~n (ID ' C ■ ¡j1 2(1 - pt) p
where C\ — the square of the variation coefficient of the packet transmission time and determines the structural complexity of the traffic, and is calculated as C\ = a\ I ml, m'h , rr,: - the value of the mathematical expectation of the packet transit time and its variance, respectively; average packct transmission
T-Comm Tом 13. #5-2019
time through system switching noiles, excluding waiting time in the queue.
Expression (It) defines one of the important probability-time characteristics of the transmitted useful and sen ice traffic and is an indicator of the QoS (QoS - Quality of Service) of transport services.
in addition, in (11), an important indicator is the load factor of the system's Software and hardware and is expressed as
A J-A, <1, i = TJi (12)
Figure I shows the graphical dependence of the average packet waiting time in the QS queue on the load factor of the serving hardware and software complex for a given switching nodes availability factor and system capacity Ct niK .
Analysis graphical dependence shows that with increasing load factor QS p > (0,65,...,0,85), meets the requirements of fault tolerance of operation and information security of the system when y, = (0,20,,..,0,40) Hrlanq, C; = 1,0 h
C/lls <(200.....l55)Mbps, the average queue length at the
network node is decreasing. Its noticeable change begins with the values p-> 0,65.
-----p,
Fig.l, Graph of average queue length packets on the value of the load factor OS
Thus, on the basis of the proposed model, analytical expressions are obtained, allowing to evaluate the performance indicators of the information processing system.
Conclusion
1. As a result of the study, MM was proposed, taking into account the presence multiple network resources, the nature useful and serv ice traffic of motor transport services, on the basis which performance indicators of the information processing system based on the NGN architectural concept using modern technologies were analyzed.
2. Based on the model, the obtained analytical expressions and the graphical dependencies shown showed that the availability network resources leads to a significant improvement in the performance characteristics information llow processing systems.
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T-Comm Vol.13. #5-2019
ИССЛЕДОВАНИЯ ЭФФЕКТИВНОСТИ ФУНКЦИОНИРОВАНИЯ СИСТЕМ ОБРАБОТКИ ИНФОРМАЦИОННЫХ ПОТОКОВ АВТОМОБИЛЬНЫХ СЛУЖБ
Ибрагимов Байрам Ганимат оглы, Азербайджанский Технический Университет (АзТУ), Баку, Азербайджан, i. bayram@mail.ru Талыбов Азиз Машаллах оглы, Военная Академия Вооруженных Сил Азербайджанской Республики, Баку, Азербайджан,
a.talibov@mail.ru
Аннотация
Предметом исследования является эффективность функционирования систем обработки информационных потоков автомобильных служб на базе архитектурной концепции последующих сетей связи (NGN, Next Generation Networks) с использованием современных информационных технологий. В качестве критерия эффективности функционирования системы выбрана производительность систем обработки информационных потоков. Последнее характеризует следующие комплексные показатели как пропускные способности системы аппаратно-программных средств, вероятностно-временные характеристики полезных и служебных транспортных трафиков, надежность функционирования системы автомобильных служб, так и защита информации от несанкционированного доступа. Целью данной работы является исследование и анализ эффективности функционирования систем обработки информационных потоков автомобильных служб. В результате исследования предложена математическая модель, учитывающая характер передаваемого транспортного трафика и наличие множества сетевых ресурсов,в основе которого были проанализированы показатели эффективности функционирования системы обработки информации. Получены аналитические выражения, позволяющие оценить показатели качества обслуживания, информационной безопасности и отказоустойчивости функционирования системы при передаче различных трафиков. На основе проведены численные расчеты и построен графической зависимости средней длины очереди пакетов от величины коэффициента загрузки системы. Графическая зависимость показал, что наличие сетевых ресурсов приводит к существенному улучшению характеристик производительности систем обработки информационных потоков.
Ключевые слова: обработки информационных потоков, надежность, производииельность, отказоустойчивость, качество обслуживания, угроза безопасности, средняя длина очереди.
Литература
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4. Ибрагимов Б.Г., Гасанов А.Г., Алиева А.А., Исаев А.М. Исследование показателей качества функционирования мультисервисных телекоммуникационных сетей на базе архитектурной концепции будущих сетей // Надежность и качества сложных систем. №1(25). 2019. С. 87-94.
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11. Bianchi G. Performance Analysis of the IEEE 802.1 1 Distributed Coordination Function // IEEE Journal on Selected Areas in Communications. Vol. 18. No.3. 2000, pp. 535-547.
Информация об авторах:
Ибрагимов Байрам Ганимат оглы, д.т.н., профессор кафедры "Телекоммуникационные системы и информационная безопасность", Азербайджанский Технический Университет, Баку, Азербайджан
Талыбов Азиз Машаллах оглы, к.т.н., профессор Военная Академия Вооруженных Сил Азербайджанской Республики, Баку, Азербайджан
