Information and controlling system 45 Copyright © 2022, Authors. This is an open access article under the Creative Commons CC BY license POINT COORDINATION MECHANISM BASED MOBILE AD HOC NETWORK INVESTIGATION AGAINST JAMMERS Shayma W. Nourildean Corresponding author Master of Engineering, Lecturer Department of Computer Technical Engineering University of Technology – Iraq Alsinaa str., Baghdad, Iraq, 00964 E-mail: Shayma.w.nourildean@uotechnology.edu.iq Sabbar I. Jasim Master of Engineering, Lecturer Department of Computer Technical Engineering Dijlah University Durah Masafi str., Baghdad, Iraq, 00964 May T. Abdulhadi Master of Engineering, Assistant Lecturer Iraqi Commission for Computers and Informatics Almansour str., Baghdad, Iraq, 00964 Mustafa Musa Jaber PhD, Lecturer Institute of Informatics and Computing in Energy, Universiti Tenaga Nasional Jl. Ikram-Uniten, Selangor, Malaysia, 43000 Al-Farahidi University Qetr Alnada str., Baghdad, Iraq, 10020 In this paper, a jamming attack (a kind of Denial-of-Service attack) was investigated, which interfered with the normal operation of a Mobile Ad Hoc network, which is more vulnerable to various attacks because of its self-configura- tion, dynamic characteristics, therefore, jammers would affect the network QoS parameters by reducing the throughput and increasing the delay. This problem is solved in this study by enabling the Point Coordination Function, which is a media access mechanism specified by the IEEE standard in some selected MANET nodes (guard nodes) to improve the deficiency of MANET’s performance. The Riverbed modeler was utilized as a simulation tool. In this study, six jammers with two different transmission power values had been applied. In a number of different simulation scenarios with and without jammers, the estimated results sho- wed that the jammers affected the network perfor- mance by increasing the delay to 3.0658 sec and decreasing the throughput to 120200.59 bits/sec. After enabling the PCF mechanism in a number of selected nodes, the results allowed the user to solve the problem by improving the network defi- ciency so that the throughput had been increased to 137478.32 bits/sec and the delay had been decreased to 0.7556 sec. It can be concluded that PCF is a good improvement for different levels of jammer transmission power such as 0.01 W and 0.001 W, and PCF also improved the network’s delay and throughput when the number of PCF enabled nodes had been increased to 10 nodes and 12 nodes, respectively. The improvement is also increased. This study can be used in practice for any ad hoc network when attacked by jammers Keywords: MANET, Riverbed, point coor- dination, routing protocols, jamming attacks, delay, throughput UDC 004 DOI: 10.15587/1729-4061.2022.265779 How to Cite: Nourildean, S. W., Jasim, S. I., Abdulhadi, M. T., Jaber, M. M. (2022). Point coordination mechanism based mo- bile ad hoc network investigation against jammers. Eastern-European Journal of Enterprise Technologies, 5 (9 (119)), 45–53. doi: https://doi.org/10.15587/1729-4061.2022.265779 Received date 09.08.2022 Accepted date 12.10.2022 Published date 27.10.2022 1. Introduction Wireless networks have recently become a major topic in the wireless communications area. These networks can be used in a variety of technological domains, including industry, the military and personal area networks. In contrast to wired networks, wireless networks such as Wi-Fi, satellite commu- nication systems, and cellular phone networks do not require established infrastructure. They consist of a collection of mo- bile and wireless nodes that dynamically exchange data with- out the use of infrastructure such as a base station or an access point. A network node has two functions: it serves as a client and vendor of data packets, as well as a router for data packets sent to other nodes [1]. MANET nodes can join and exit the network at any time. In the event that the source node is not immediately accessible to the destination node, these nodes can employ multi-hop communication. The collaboration of intermediary nodes is required for node dependability. As a result, MANET designs are vulnerable to a variety of as- saults [2]. MANET manages a variety of sensitive data from a variety of applications in a variety of industries, making it more vulnerable to diverse attacks owing to its dynamic na- ture. The nodes in the network are self-configuring, therefore, they can travel from one location area to another freely with- out the need for centralized management [3]. Therefore, the studies that are devoted to improving MANET against jam- mers utilizing PCF are scientifically relevant in the modern times for the study or design of any ad hoc network because the self-organized nature of MANET made it valnerable to jammers, which cause network deficiency. So, the results of these studies could improve the quality of service parameters of the network performance. 2. Literature review and problem statement In [4], the performance of mobile ad hoc networks under jamming was studied. This project contains a high-mobility