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In this paper, we propose Floating Band D2D, an adaptive framework to exploit the full potential of Device-to-Device (D2D) transmission modes. We show that inband and outband D2D modes exhibit different pros and cons in terms of complexity, interference, and spectral efficiency. Moreover, none of these modes is suitable as a one-size-fits-all solution for today's cellular networks, due to diverse...
Physical layer capture is one of the main causes of unfairness in IEEE 802.11 Wireless LANs. While existing work have analyzed the impact of physical layer capture on the total system throughput of a cell, we analyze the unfairness among users as result of capture. Since this unfairness is related to the relative location of users, we call it as spatial unfairness. Our analysis characterizes the relative...
Interference management (RF management) remains one of the main challenges facing the design and deployment of large-scale WLAN. RF management involves the detection, estimation and control of power level, channel allocations and link schedules, to improve the performance of the wireless network. Among interfering links, one can find different types of dependencies. While some of these types can be...
Nowadays, trying to obtain better coverage and performance, and allowed by the low-hardware prices, it is common to deploy a large number of IEEE 802.11 devices in offices, meeting rooms or auditoriums configuring the so called high-density networks. In such a scenario, the shared nature of the transmission medium causes interference problems. Some physical-layer- and link-layer-adaptation mechanisms...
Oil and gas refineries can be a dangerous environment for numerous reasons, including heat, toxic gasses, and unexpected catastrophic failures. In order to augment how human operators interact with this environment, a mobile robotic platform is developed. This paper focuses on the use of WiFi for communicating with and localizing the robot. More specifically, algorithms are developed and tested to...
Software-Defined Networking promises to deliver more flexible and manageable networks by providing a clear decoupling between control plane and data plane and by implementing the latter in a logically centralized controller. However, if such principles are to be applied also to wireless networks, new primitives and abstractions capable of providing programmers with a global view of the network capturing...
Collisions due to interference at MAC layer limit the throughput of Ad Hoc networks using IEEE 802.11 protocol at medium and high load conditions. The proposed MAC layer MAC-CPI-A (Collision Prevention due to Interference) protocol prevents collisions due to interference completely. In the proposed protocol every node refrains from beginning its transmission if any node within its ‘maximum interference...
Energy constrained devices, operating on short-range wireless networking standards such as IEEE802.15.4 and IEEE802.11x, are expected to be deployed for the IoT (Internet of Things) applications. However, co-located deployment of such devices based on different standards using the same 2.4 GHz license free Industrial, Scientific and Medical (ISM) spectrum, introduces coexistence issues, specifically...
The size of data exchanged via the Internet and the number of Wi-Fi devices have been increasing, and the amount of data traffic will continue to increase in the future. Thus, ensuring the communication capacity of wireless LANs is one of the most important issues. By reducing communication coverage of each wireless LAN access point (AP) and densely deploying APs, it is possible to improve the communication...
In this paper, a medium access protocol suitably adapted for the operation of Long term evolution (LTE) in unlicensed band (LTE-U) is proposed. The MAC design considers the impact of LTE-U on the devices operating in unlicensed band, such as WiFi and legacy LTE. The LTE-U design differences from the legacy LTE system, an inherently a synchronized, tightly controlled system are explored. The performance...
With the increasing demand of the high quality service applications the 802.11 WLAN (Wireless Local Area Network) performance becomes the important issue. This paper proposes a Channel Management Algorithm to enhance the network performance by balance the load on access points (APs) to maximize the efficiency of available channels. By managing network channels the overall throughput gets maximized...
The femtocell — Wi-Fi integration is a promising approach to solve the problem of inter-tier or intra-tier interference in heterogeneous networks. In this paper, multimode femtocell base stations are deployed which form a Wi-Fi mesh network to communicate between themselves while deploying cellular technology (e.g., LTE) for communications with mobile users, thus ensuring ultimately connectivity between...
This paper proposes an improved mesh path selection protocol for QoS support in wireless mesh network, while avoiding the inherent problems of proactive and reactive path selection elements. The proposed ‘Advanced Selective Greedy’ (SelG+) path selection protocol operates in two phases. In the first phase it constructs a set of potential forwarders for every mesh stations. In the second phase during...
Thanks to the smart device revolution, modern wireless devices have increased computational/storage capabilities and can also support for multiple network interfaces such as cellular and WiFi interfaces. Intelligent utilization of multiple network interfaces can address the problem of cellular traffic congestion and it can also increase the frequency resources of cellular networks. Cooperative content...
In indoor scenarios where conventional macro BS coverage can be poor, femto cells present a promising solution for high quality wireless access. They are randomly deployed by the user and share the customer broadband connection for cellular core connectivity. Furthermore, this sharing can creates severe capacity and reliability issues. Traditional solutions like Line-of-Sight (LoS), microwave link...
Facing the challenge of providing sufficient network capacity for wireless data, the industry is currently debating how to take advantage of hundreds of megahertz of unlicensed spectrum. One specific proposal being considered by the 3GPP is to retool and deploy Long Term Evolution (LTE) technologies in unlicensed bands. This paper studies the fundamental questions of whether and how the unlicensed...
Microwave Oven (MWO) is a potential source of interference to Wi-Fi Networks, operating within same frequency range. This experiment investigates different aspects of the effects of operation of microwave oven on Wi-Fi Network. It has been observed that the interference caused by microwave is most adverse when microwave is at same height as the transmitter and receiver and when it is closer to one...
The rate control mechanism is an effective way to improve the overall system performance in IEEE 802.11 multi-rate networks. However, in dense environments, due to the large number of contending nodes, the packet collisions trigger unfairly the rate control mechanism to decrease the transmission data rate. In this work, we address the performance degradation problem of rate control caused by these...
Wireless Local Area Networks (WLAN), using IEEE 802.11, and Wireless Personal Area Networks (WPAN), using IEEE 802.15.4/Zigbee standard, share the same unlicensed 2.4 GHz Industrial Scientific Medical band. Co-existence between such wireless technologies within the same frequency spectrum is crucial to ensure that each wireless technology guarantees the desired performance requirements. In this paper...
Device-to-Device (D2D) is considered as a promising technique to improve resource utilization and provide new application in future wireless networks. This paper addresses the problem of radio resource allocation for D2D communication. Basically, resource allocation can be carried out in centralized or distributed manner. In this paper we discuss the mechanisms of distributed resource allocation and...
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