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The current and future IEEE 802.11 deployment could potentially offer wireless Internet connectivity to mobile users. The limited AP radio coverage forces mobile devices to perform frequent handovers while current operating systems lack efficient mechanisms to manage AP transition. Thus we propose an anticipation-based handover solution that uses a Kalman filter to predict the short term evolution...
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...
We present testbed experiments of multi-source mobile video streaming that jointly exploits mobility and throughput prediction to prefetch video data in caches located at hotspots that the mobile will encounter and device-to-device (D2D) communication to opportunistically obtain parts of a video from neighboring mobile devices. A contribution of this paper includes a procedure to efficiently utilize...
High quality video streaming for mobile users is difficult to achieve in some areas of the world due to poor broadband capacity and sparse network coverage. We propose a bandwidth-sharing scheme to allow users with limited uplink bandwidth to borrow idle bandwidth from nearby access points and provide these users the opportunity to experience higher quality video than what their own bandwidth could...
IEEE 802.11ah task group is working on a new amendment of the IEEE 802.11 standard, suitable for high density WLAN networks in the sub 1 GHz band. It is expected to be the prevalent standard in many Internet of Things (IoT) and Machine to Machine (M2M) applications where it will support long-range and energy-efficient communication in dense network environments. Therefore, significant changes in the...
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...
The work in this paper studies the performance of Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) medium access control (MAC) mechanism in IEEE 802.11 DCF. From studying the propagation delay and clock synchronization differences between terminals, it is concluded that the slight timing differences, effectively a relative jitter, contributes to reducing the probability of collisions after...
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...
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...
In recent years, wireless networks (including WLANs and cellular networks) have been widely deployed in enterprise, public areas and homes. In wireless networks, users are observed to act collaboratively rather than arriving or leaving independently. In this paper, we have analysed real WiFitraces deployed in an enterprise in 2012 and cellular network traces from a urban areas in China in 2013. We...
The evolution of wireless networks and the low cost of WiFi technology, have enabled a promising scenario for deployment of these kind of networks in rural areas, as an effective alternative to interconnect distanced sites above tens kilometers. This work presents the results of the performance evaluation of a network with WiLD technology, based on simulation and a deployment in the Andean region...
As a part of Fourth Generation (4G) wireless communication system, a user can associate with any radio access technology (RAT) when there are multiple RATs available and can move seamlessly among them. To handle the explosive growth of traffic in cellular network, the idea of mobile data traffic offloading to Wireless Fidelity (WiFi) has been proposed. In this paper, we focus on mobile data offload...
Handheld and non-handheld devices, which are simultaneously online, constitute the regular clients of the campus wireless local area networks (WLAN). It is necessary to understand the patterns of the user distribution and the user behavior, and adopt better strategies to optimize the service, as well as to understand the students' daily life. This paper introduces a approach of understanding how campus...
Public areas, such as train stations and airports, providing wireless Local Area Network (WLAN) services are increasing and expanding because of the rapid development of WLANs based on IEEE 802.11 standard. Moreover, because of the advances in smartphone tethering technology, portable access points (APs) such as mobile Wi-Fi routers are being utilized more frequently. Consequently, there are increasing...
The CPqD Cognitive Mesh Network (CCMN) has been developed with traditional cognition elements, such as energy detection based sensing and with the ability to switch the data channel to take advantage of any available channels on a given radio-electric spectrum band. Many of the solutions that utilize cognitive mesh networks are based on the fact that it uses a common control channel (CCC) to manage...
Wireless mesh network (WMN) has been proposed to extend wireless coverage by using multi-hop communication to enable network service for mobile devices via densely deployed mesh APs. While modern wireless devices are capable of using multiple WiFi interfaces, the Multipath TCP (MPTCP) protocol has been employed to make full use of the capacity of multiple radios. A key question of MPTCP communication...
The performance of MAC layer protocol in wireless network is the main factor that determines the efficiency in sharing and utilizing the limited bandwidth resources. In this paper, a practicable distributed backoff algorithm, which is named Adaptive Contention Window Backoff (ACWB) for IEEE 802.11 wireless LAN is presented. ACWB algorithm tunes the Contention Window size in a distributed manner at...
Agile providing Internet connectivity to the victims right after a disaster occurs is essential to mitigate loss and save people. It is hard, however, to quickly recover communication infrastructures due to many difficulties such as reach ability to the destroyed areas, heavy and wide-area damages requiring a huge amount of resources and human power to recover, and so forth. WiFi based multihop access...
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...
WiFi is currently the most widely used communication standard over wireless LAN . Facing the trend that broad band and networking quality are emphasized, the IETF SIGTRAN working group and IEEE 802.11standards working groups proposed a new-generation communication protocol, stream control transmission protocol (SCTP) and wireless LAN communication standard, IEEE 802.11ac/VHT for transport layer and...
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