scholarly journals Digital Radio Networks Centralized Elements Synchronization Model with Random Multiple Access to the CSMA/CA Type Medium

2020 ◽  
pp. 128-154
Author(s):  
Maksim Peregudov ◽  
Anatoliy Steshkovoy
Keyword(s):  
Communication Networks ◽  
Analytical Model ◽  
Multiple Access ◽  
Radio Networks ◽  
Packet Transmission ◽  
Theoretical Research ◽  
Radio Network ◽  
Radio Communication ◽  
Digital Radio ◽  
Research Results

Currently, there is a great interest in digital radio network centralized elements synchronization with random multiple access to the CSMA/CA type , the effectiveness of which determines the process of establishing a communication session. At the same time, there was no assessment effectiveness digital radio communication network centralized elements synchronization with random multiple access to the CSMA/CA type. Also, there was no assessment made the contribution of potential destructive actions by the attacker to the reduction in the effectiveness of such synchronization. This paper presents digital radio networks centralized elements synchronization analytical model with random multiple access to the CSMA/CA type medium. In this model the theoretical resulting indicator is the probability of successful delivery of a synchronization package, and a package frequency of successful delivery is used in experimental indicator evaluation . The model takes into account the potential destructive effects of the attacker in analytical expressions for known probabilistic indicators. An digital radio network  centralized elements synchronization with random multiple access to a CSMA/CA type experimental study an environment is also presented. The most common network of digital radio standard IEEE 802.11 (Wi-Fi) is considered as such network. The experimental research results differ from the theoretical research results slightly, which indicates the adequacy of the developed analytical model. It was established, firstly, that the successful delivery probability of a synchronization packet does not depend on number of subscriber terminals in digital radio communication networks, secondly, with an average duration of a data packet transmission by such terminal less than 0.85 ms, it is advisable to use non-random, and the reserved multiple access to the environment, and, thirdly, centralized synchronization is resistant to destructive influences. The model is applicable in the design of digital radio networks with random multiple access to the medium such as CSMA/CA, as well as in optimizing the operation of such networks.

scholarly journals Digital Radio Networks Centralized Elements Synchronization Model with Random Multiple Access to the CSMA/CA Type Medium

2020 ◽  
Vol 19 (1) ◽  
pp. 128-154 ◽  
Author(s):  
Maksim Peregudov ◽  
Anatoliy Steshkovoy
Keyword(s):  
Communication Networks ◽  
Analytical Model ◽  
Multiple Access ◽  
Radio Networks ◽  
Packet Transmission ◽  
Theoretical Research ◽  
Radio Network ◽  
Radio Communication ◽  
Digital Radio ◽  
Research Results

Currently, there is a great interest in digital radio network centralized elements synchronization with random multiple access to the CSMA/CA type , the effectiveness of which determines the process of establishing a communication session. At the same time, there was no assessment effectiveness digital radio communication network centralized elements synchronization with random multiple access to the CSMA/CA type. Also, there was no assessment made the contribution of potential destructive actions by the attacker to the reduction in the effectiveness of such synchronization. This paper presents digital radio networks centralized elements synchronization analytical model with random multiple access to the CSMA/CA type medium. In this model the theoretical resulting indicator is the probability of successful delivery of a synchronization package, and a package frequency of successful delivery is used in experimental indicator evaluation . The model takes into account the potential destructive effects of the attacker in analytical expressions for known probabilistic indicators. An digital radio network  centralized elements synchronization with random multiple access to a CSMA/CA type experimental study an environment is also presented. The most common network of digital radio standard IEEE 802.11 (Wi-Fi) is considered as such network. The experimental research results differ from the theoretical research results slightly, which indicates the adequacy of the developed analytical model. It was established, firstly, that the successful delivery probability of a synchronization packet does not depend on number of subscriber terminals in digital radio communication networks, secondly, with an average duration of a data packet transmission by such terminal less than 0.85 ms, it is advisable to use non-random, and the reserved multiple access to the environment, and, thirdly, centralized synchronization is resistant to destructive influences. The model is applicable in the design of digital radio networks with random multiple access to the medium such as CSMA/CA, as well as in optimizing the operation of such networks.

scholarly journals Centrally Reserved Access Model to the Medium in Digital Radio Communication Networks

2020 ◽  
Vol 19 (6) ◽  
pp. 1332-1356
Author(s):  
Maksim Peregudov ◽  
Anatoliy Steshkovoy
Keyword(s):  
Ieee 802.11 ◽  
Communication Networks ◽  
Data Transmission ◽  
Multiple Access ◽  
Model Development ◽  
Transmission Channel ◽  
Radio Communication ◽  
Digital Radio ◽  
Relationship Of ◽  
Sequential Relationship

Currently, centrally reserved access to the medium in the digital radio communication networks of the IEEE 802.11 family standards is an alternative to random multiple access to the environment such as CSMA/CA and is mainly used in the transmission voice and video messages in real time. Centrally reserved access to the environment determines the scope of interest in it from attackers. However, the assessment of effectiveness of centrally reserved access to the environment under the conditions of potentially possible destructive impacts was not carried out and therefore it is impossible to assess the contribution of such impacts to the decrease in the effectiveness of such access. Also, the stage establishing of centrally reserved access to the environment was not previously taken into account. Analytical model development of centrally reserved access to the environment under the conditions of destructive influences in digital radio communication networks of the IEEE 802.11 family standards. A mathematical model of centrally reserved access to the environment has been developed, taking into account not only the stage of its functioning, but also the stage of formation under the conditions of destructive influences by the attacker. Moreover, in the model the stage of establishing centrally reserved access to the medium displays a sequential relationship of such access, synchronization elements in digital radio communication networks and random multiple access to the medium of the CSMA/CA type. It was established that collisions in the data transmission channel caused by destructive influences can eliminate centrally reserved access to the medium even at the stage of its establishment. The model is applicable in the design of digital radio communication networks of the IEEE 802.11 family of standards, the optimization of such networks of the operation, and the detection of potential destructive effects by an attacker.

scholarly journals Evaluation of Efficiency of Random Multiple Access to ALOHA Type Environment with Voice Connections, Transfer of Service Commands, Text Messages and Multimedia Files in Destructive Impact Conditions

2019 ◽  
Vol 18 (4) ◽  
pp. 887-911
Author(s):  
Maksim Peregudov ◽  
Ivan Semchenko
Keyword(s):  
Multiple Access ◽  
Text Message ◽  
Radio Networks ◽  
Radio Network ◽  
Radio Communications ◽  
Digital Radio ◽  
Communications Networks ◽  
Data Packets ◽  
Multimedia File ◽  
Degree Of Filling

Assessing the security of digital radio networks in destructive impact conditions is an important task. However, such an assessment for random multiple access to the ALOHA-type environment in digital radio networks was not carried out. The paper presents an analytical model of random multiple access for the environment of digital radio networks of the ALOHA type in destructive impact conditions. In this model, acomplex measure, including the probability of a successful voice connection, the transfer of a service command, a text message or a multimedia file, the degree of filling and the degree of overflow of digital radio network data packets, serves as the resultant indicator for evaluating the effectiveness of random multiple media access. The new complex indicator of the probability of a successful voice connection, the transfer of a service command, a text message or a multimedia file takes into account the known probabilities of successful delivery of data packets, creation of a collision and a free channel, as well as new average transmission times for a sequence of data packets and a collision formed during such transmission. New indicators are the degree of filling and the degree of overflow of digital radio communications network data packets. They determine in saturated and supersaturated data networks of such a network how close (far) to maximum is the probability value of a successful voice connection, transmission of a service command, test message or multimedia file. The model takes into account the potential destructive effects of the attacker by refining the analytical expressions for the known probabilistic and new temporal characteristics. First, a quantitative relationship between the probability of a successful voice connection, the transfer of a service command, a text message or a multimedia file and the average duration of a data channel collisions is established./ Secondly, for guaranteed disabling a digital radio network with random multiple access to the medium ALOHA type attacker must constantly carry out a destructive impact. The results are applied in design of digital radio communications networks operating under destructive impacts, as well as in development of automatic systems for optimizing the operation of digital radio communications networks and protecting them from such impacts.

scholarly journals Performance of Base Stations in Railway Digital Radio Communication Networks

2021 ◽  
Vol 19 (2) ◽  
pp. 41-48
Author(s):  
Yu. V. Nemtsov ◽  
I. V. Seryogin ◽  
P. I. Volnov
Keyword(s):  
Communication Network ◽  
Communication Networks ◽  
Base Station ◽  
Base Stations ◽  
Radio Communication ◽  
Radio Communications ◽  
Digital Radio ◽  
Cargo Transportation ◽  
Assess Quality

Base station (BS) is a terminal device of a radio communication network, while railway radio communications play an important role in ensuring safety of passenger and cargo transportation.A proposed method for calculating the performance of base stations in railway digital radio communication networks is intended to calculate for the BS the probabilities of being in certain state.BS was decomposed and such functional elements as circuit groups and a radio frequency path were identified, as well as the central module ensuring the exchange of information with elements of this BS and with other BSs. A detailed study of each element has increased accuracy of the proposed method. Following the Markov model, BS is presented as a system in which all possible states are considered. Models for BS with two and three circuit groups have been constructed. The parameters of each functional element of the model can be obtained through observation over a certain period. The solution of the system of equations for each of the models presented in the article will allow obtaining the values of the system being in a certain state. The obtained characteristics can be used to calculate the reliability of the entire radio communication network, and then to assess quality of service provided to the users of this network.Conclusions are made about the possibilities of using the obtained models when designing new railway communication networks and when calculating quality indices of existing ones. The proposed models can be applied not only to railway radio communication networks but also to mobile communication networks of commercial operators. 

scholarly journals Development of a simulation model for a special purpose mobile radio network capable of self-organization

2021 ◽  
Vol 5 (2(61)) ◽  
pp. 49-54
Author(s):  
Oleg Sova ◽  
Andrii Shyshatskyi ◽  
Oleksii Nalapko ◽  
Oleksandr Trotsko ◽  
Nadiia Protas ◽  
...  
Keyword(s):  
Simulation Model ◽  
Communication Systems ◽  
Radio Networks ◽  
Mobile Radio ◽  
Routing Algorithms ◽  
Self Organization ◽  
Radio Network ◽  
Radio Communication ◽  
Mobile Radio Network ◽  
The Impact

The object of research is the military radio communication system. Effective operation of routing protocols is possible only if there is reliable information about the network topology for each of the network nodes. Construction of special purpose radio networks with the possibility of self-organization is possible only in the presence of adequate and reliable models of their work in different applications and the impact nature. It necessitates the development of new and adequate algorithms (methods, techniques) for modeling routing algorithms in special purpose radio networks with the possibility of self-organization. This work solves the problem of developing a simulation model of a mobile radio network for special purposes with the possibility of self-organization. In the course of the research, the authors used the main provisions of the queuing theory, the theory of automation, the theory of complex technical systems and general scientific methods of cognition, namely analysis and synthesis. This simulation model was developed to assess the effectiveness and adequacy of the developed scientific and methodological apparatus for routing management in special purpose radio networks with the possibility of self-organization. The research results will be useful in: ‒ development of new routing algorithms; ‒ substantiation of recommendations for improving the efficiency of the route selection process in networks with the possibility of self-organization; ‒ analysis of the electronic situation during hostilities (operations); ‒ while creating promising technologies to increase the efficiency of mobile radio networks; ‒ assessment of adequacy, reliability, sensitivity of routing algorithms; ‒ development of new and improvement of existing simulation routing models. Areas of further research will focus on the development of a methodology for the operational management of interference protection of intelligent military radio communication systems.

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