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Special issue on amateur drone and UAV communications and networks
Jamalipour, Abbas,Kaleem, Zeeshan,Lorenz, Pascal,Choi, Wan Editorial Department of Journal of Communications 2018 Journal of communications and networks Vol.20 No.5
<P>The development of the mini-drones, formally called unmanned air vehicles (UAVs) have captured the attention of hobbyists and the investors due to their enormous applications. Drones have endless commercial applications as well due to the irrelatively small size and ability to fly without an on-board pilot such as in agriculture, photography, surveillance, and numerous public services. The use of drones for achieving high speed wireless communication is one of the most significant applications for next generation communication system (5G). Indeed, drone-based communication network offers encouraging solution to provide wireless connectivity for devices without infrastructure coverage due to e.g., severe shadowing by urban or mountainous terrain, or damage to the communication infrastructure caused by natural disasters.</P>
A Traffic Congestion Avoidance Scheme for LEO Satellite Networks by Using Traffic Detour Technique
Mashimo, Daisuke,Taleb, Tarik,Jamalipour, Abbas,Kato, Nei,Nemoto, Yoshiaki 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
Given that wired network infrastructure is not yet ready in more than half of the world, satellite networks attrack attention as an important choice to build global communication networks. Satellite networks must deal by a communication demand of different quantity in every area due to most of the world people live around the equator or in middle latitude area. In addition, distribution of traffic becomes more unbalanced due to population density is different in a city and a district. As a result, the congestion occurs in some satellites, while others are not used at all. The problem about traffic engineering in satellite networks can be solved by scattering traffic over underutilized links. Therefore, this paper proposes a traffic congestion avoidance scheme using Traffic Detour Technique (TDT) which is based on traffic information about a satellite of next hop on the remainder of the path to the destination. The satellite where traffic was concentrated transmits a signaling packet to its neighboring satellites to decrease their sending rate before congestion occurs or packets drop. Neighboring satellites follow it and look for alternate paths of the others which do not include the satellite where a problem occurred. The performance of the proposed scheme is evaluated by simulations. And from the results, this scheme achieves a better traffic distribution and decreases the number of packet drops.
Nishiyama, Hiraki,Taleb, Tarik,Nemoto, Yoshiaki,Jamalipour, Abbas,Kato, Nei The Korea Institute of Information and Commucation 2006 Journal of communications and networks Vol.8 No.4
With the on-going wireless access technologies, the Internet has become accessible anytime anywhere. In wireless networks, link errors significantly degrade the performance of the transmission control protocol (TCP). To cope with this issue, this paper improves the recently-proposed terrestrial REFWA (T-REFWA) scheme by adding a new error recovery mechanism to its original design. In the T-REFWA scheme, senders are acknowledged with appropriate sending rates at which an efficient and fair utilization of network resources can be achieved. As the feedback values are computed independently of link errors, senders can keep transmitting data at high rates even in case of link error occurrences. Using this feature, the proposed error recovery mechanism can achieve high throughput in environments with high bit error rates. The throughput is further improved by disabling the exponential back-off algorithm of TCP so that long idle times are avoided in case of link errors. We show through simulations that the proposed method improves TCP performance in high bit error rates. Compared with several TCP variants, the proposed error recovery scheme exhibits higher link utilization and guarantees system fairness for different bit error rates.
ENERGENT: An Energy-Efficient UAV-Assisted Fog-IoT Framework for Disaster Management
Shirin Abkenar, Forough,Iranmanesh, Saeid,Bouguettaya, Athman,Raad, Raad,Jamalipour, Abbas 한국통신학회 2022 Journal of communications and networks Vol.24 No.6
In this paper, we propose ENergy-efficient disastERmanaGmENT (ENERGENT) as a novel framework for disastermanagement in the unmanned aerial vehicle (UAV)-assisted Fog-Internet of things (IoT) networks. ENERGENT optimizes theenergy consumption of the terminal nodes (TNs), as well asthe UAVs, using three proposed algorithms. The first algorithmoptimally adjusts the 3D placement of the UAVs such that thesenodes consume the minimum energy to reach the desired clusterof the TNs. Besides, the transmit power and the transmissionrate of the TNs are set in a way that their energy consumptionis minimized and the outage probability requirements are metin the network. In the second algorithm, we propose an optimaltask offloading scheme where tasks are offloaded to the UAVsin order to meet the network delay constraints. Finally, thethird algorithm takes advantage of wireless power transfer totransfer energy to the TNs when their remaining energy degradesa predefined threshold. This scheme guarantees a minimumthroughput for all TNs within a cluster by which the totalnetwork throughput is maximized. Simulation results revealthat ENERGENT outperforms the existing methods in terms ofoptimized network energy consumption, delay, and throughput.