Studying specifics of MAC algorithms realization in mobile self-organizing communications networks

Systems, networks and telecommunication devices


Аuthors

Bakhtin A. A.1*, Volkov A. S.2**, Baskakov A. E.1***

1. National Research University of Electronic Technology, 1, sq. Shokina, Moscow, Zelenograd, 124498, Russia
2. National Research University of Electronic Technology "MIET", 1, Shokin Square, Zelenograd, Moscow, 124498, Russia

*e-mail: bah@miee.ru
**e-mail: leshvol@mail.ru
***e-mail: 79999924816@ya.ru

Abstract

With account for the trends of mobile self-organizing communications networks development, the number of technologies and communication systems employing the principle of infrastructure building without the use base station will increase in subsequent years. Thus, more and more tasks, which should be solved on a data link layer of the system developed, are being revealed. A base station absence in the network topology generates the tasks of organizing the message delivery route selecting, which is especially important in mobile self-organizing communications networks. The concept of mobility itself, i. e. nodes’ permanent spatial motion imposes additional restrictions on the communication system. Thus, the problem of transmitting the service and information frames in conditions of a non-constant connection between nodes occurs. Currently, one of the most widely used algorithms for the environment accessing is the CSMA\CA algorithm. Stations and subscribers of the 802.11 network, that is, Wi-Fi networks are operating on its base. The algorithm is based on the principle of transferring the service frames of the RTS-CTS-DATA-ACK format. Using this algorithm allows solving the problems of a hidden node. The MACA algorithm lies at the heart of the implementation of CSMA\CA and is distinguished by the use of RTS-CTS-DATA service frames, without delivery confirmation. These algorithms have disadvantages, such as a large number of service frames in the communication channel and a possible non-delivery of the service frame with a changing network topology.

To solve these problems, an algorithm MMAC was developed. Application of this algorithm implies the presence of two or more communication channels by each node: separate communication channels for the transmission of service frames and for the transmission of data frames. Since this imposes additional costs on the implementation of the second channel, the algorithm has been modified. The LCM MAC algorithm employs the principle of separate transmission of service and information frames in different time slots.

A study of their efficiency was performed by simulating these algorithms in the software environment of Network Simulator 3. Analysis of simulation results revealed that the access algorithms for the MMAC and LCM MAC algorithms demonstrate the best packet delivery rate and network bandwidth compared to the MOCA and CSMA\CA algorithms (at the average by 20% and 500 bit / s, respectively). Based on the performed work, it was revealed that the actual task of research and development of a mobile self-organizing communication system, namely its data link layer, is the solution of a number of tasks:

  • overflow of service frames;

  • significant decrease in network bandwidth with increasing number of nodes;

  • possible non-delivery of packets with increasing number of nodes;

  • impossibility of simultaneous listening of service frames and transmission of information frames without involvement of additional channels;

  • unused information from other layers of the OSI model.

Keywords:

MAC, access algorithm, Ad-Hoc

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