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  • Open Access


    Interference-Aware Transmission Scheduling for Internet of Vehicles

    Mohammad Zubair Khan1,*, Muhammad Awais Javed2, Hamza Ghandorh1, Omar H. Alhazmi1, Khalid S. Aloufi3

    Intelligent Automation & Soft Computing, Vol.33, No.1, pp. 305-315, 2022, DOI:10.32604/iasc.2022.024091

    Abstract Next-generation Intelligent Transportation Systems (ITS) use wirelessly connected vehicles for safety and non-safety applications such as autonomous driving, cooperative awareness, route guidance and multimedia transmissions. This network known as the Internet of Vehicles (IoVs) suffers from many challenges such as collisions due to hidden terminals, and interference from simultaneously transmitting vehicles. Moreover, the packet reception ratio of transmissions between vehicles is significantly reduced at high vehicle densities and severe fading scenarios. As safety applications require periodic broadcast of safety messages from each vehicle to all other vehicles in the neighborhood, the development of an efficient medium access technique is a… More >

  • Open Access


    An Efficient Medium Access Control Mechanism for Flying Ad-hoc Networks

    Muhammad Asghar Khan1,*, Fazal Noor2, Insaf Ullah3, Sajjad ur Rehman4, Shibli Nisar5, Mohaira Ahmad5

    Computer Systems Science and Engineering, Vol.38, No.1, pp. 47-63, 2021, DOI:10.32604/csse.2021.016430

    Abstract The Flying Ad-hoc Networks (FANETs) is characterized by the transition from a single large Unmanned Aerial Vehicle (UAV) to multiple small UAVs connected in an ad-hoc fashion. Since high mobility is the core feature of such networks, they are prone to route breaks within the links. The issue of connectivity loss can be coped with, to some extent, by making use of omnidirectional antennas. Such modification, however, curtails Quality-of-Service (QoS) requirements of networks in terms of bandwidth, media access delay, coverage and others. Alternately, directional antennas have advantages over omnidirectional antennas such as improved transmission range, spatial reuse and high… More >

  • Open Access


    A LoRaWAN Access Technology Based on Channel Adaptive Adjustment

    Li Ma, Meng Zhao*, Dongchao Ma, Yingxun Fu

    Journal of New Media, Vol.2, No.1, pp. 11-20, 2020, DOI:10.32604/jnm.2020.09715

    Abstract Low-power wide area network (LPWAN) has developed rapidly in recent years and is widely used in various Internet of Things (IoT) services. In order to reduce cost and power consumption, wide coverage, LPWAN tends to use simple channel access control protocols, such as the Aloha protocol. This protocol is simple with poor extension capability. In high-density environment, Aloha protocol will lead to low channel utilization, prolonged access and high conflict probability. Therefore, in order to solve the above problems, we propose an enhanced channel access control mechanism based on the existing LoRaWAN protocol, that is, a dynamic listening backoff mechanism.… More >

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