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The UAVs (Unmanned Aerial Vehicles) market is projected to grow, sustained by the technological progress in different domains related to UAVs and by the emergence of new civilian applications. However, this economical development might be held back due to increased regulation constraints. A major concern of public authorities is to ensure a safe sharing of the airspace, especially over populated areas...
Transmission control protocol (TCP), a widely used transport layer protocol provides reliable service and end-to-end congestion control. Performance of TCP is satisfactory in wired networks but fails to perform well in wireless networks. It is because in wireless networks two types of packet losses are important. Congestion loss and transmission loss. Transmission loss can be ignored in wired networks...
This paper proposes a methodical approach to improve the Quality of Service (QoS) evaluation in wireless and mobile networks. The approach uses the fuzzy logic tools and techniques to map the traditional QoS parameters into a unified value to quantify the QoS levels of these networks. Extensive simulation studies are conducted to examine the effectiveness of this method. The results show that our...
Most of the existing back off algorithms adjust the Contention Window (CW) only after the occurrences of collision in wireless networks. To prevent/ reduce further collisions, this paper proposes a sliding CW approach, to be done, after each successful transmission. Based on the current channel status measured by channel utilization and contention ratio, sliding factors are determined to adjust both...
In this paper, the potential QoS performance improvement gained by applying application-based QoS control in wireless networks is investigated. Two important performance metrics, i.e. queuing delay and packet drop, are approximately modeled and derived for the QoS control at the base stations using a simplified queuing model. Based on it, the performance comparison between the approaches of application-based...
With the rapid development of wireless networks and mobile terminals (MTs), cooperation among MTs in heterogeneous wireless networks is currently widely investigated. Cooperation among MTs has a lot of advantages such as increasing network throughput, decreasing file download time, saving energy. Traffic distribution, which means how to distribute the traffic to the cooperating MTs, is a key issue...
Because of the explosive development of different wireless technologies, mobile users can now access multiple wireless networks simultaneously. In this environment, a multiple path scheduling algorithm can improve the performance of the wireless networks and ensure high quality of video streaming for mobile users. This may not be the case, however, for TCP flows. One key reason is the occurrence of...
Voice over Internet Protocol is a technology that enables to transport voice over Internet Protocol. The growth of this technology is due to the integration of voice and data traffic over wireless infrastructure. The low cost of voice usage on internet and wide spread of wireless technology has an advantage to implement VoIP system in today IP network. This study investigates the performance of VoIP...
Nowadays, networks are large heterogeneous systems in which efficient and effective support for multi-access technologies is imperative. The enhanced performance and availability of various technologies like WiFi, WiMax, and UMTS have motivated network users towards increased utilization. In these heterogeneous networks, a seamless connectivity with acceptable level of quality should be maintained...
In order to improve the performance of existing multicast congestion control mechanisms applied to wireless networks, in this paper, we propose an expert-control-based intelligent multicast congestion control mechanism for wireless networks, termed ECMCC. ECMCC detects the network congestion state according to network relative queuing delay and packet loss, feedbacks information to multicast source...
With the emerging IEEE 802.11n standard, the WLAN is poised as a promising ubiquitous networking technology to support multimedia applications where providing QoS becomes imperative. However, the 802.11 WLAN is not designed to support delay sensitive traffic. This problem is magnified during a handover and typically results in excessive handover latency and packet loss. In addition, a 802.11 WLAN...
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