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With the rapid growth of smart devices such as smartphones, tablets, and laptops, traffic demands in IEEE 802.11 wireless local area networks (WLANs) has been increased exponentially. To meet the demand, in recent years, numerous access points (APs) have been deployed in many places such as residential areas, shopping malls, airports, office and campus buildings. As the density of 802.11 WLAN increases,...
The robots having 3G/LTE capability can cooperate with others by using link-aggregation when one needs to send unexpected huge data in high bandwidth to the remote center office. To do so, the robot distributes its data to other robots with IEEE802.11 WLAN. They can move close to the robot to prevent from the situation where the WLAN communication becomes a bottleneck because they are too far to get...
IEEE 802.11 WLANs use carrier sense multiple access with collision avoidance (CSMA/CA) to initiate the Request to Send / Clear to Send (RTS/CTS) handshaking mechanism that solves the hidden node problem. However RTS/CTS also causes the exposed node problem where a node is unnecessarily prevented from accessing the wireless channel even when such access will not disrupt another nodes ongoing transmission...
In dense wireless deployments, such as Enterprise WLANs (EWLANs) and home WLANs, interference may occur because of neighbouring WLANs sharing the same unlicensed spectrum. Mechanisms to centrally manage WLAN deployments cannot effectively mitigate the interference caused by hidden terminals (HTs) in WLANs that belong to different organisations. Furthermore, the impact of interference is amplified...
In this work, we introduce a powerful hardware-based rogue access point (PrAP), which can relay traffic between a legitimate AP and a wireless station back and forth, and act as a man-in-the-middle attacker. Our PrAP is built of two dedicated wireless routers interconnected physically, and can relay traffic rapidly between a station and a legitimate AP. Through extensive experiments, we demonstrate...
The recently released IEEE 802.11ac standard has implemented enhancements including higher maximum transmission rate and larger maximum packet payload length. In wireless local area networks (WLANs) where the latest 802.11ac nodes and the legacy ones coexist, nevertheless, the effects of the enhancements on the data rate performance remain largely unknown. In this paper, we tackle this open problem...
Wireless systems have migrated into the automotive domain very fast in the recent years. Car passengers expect to have seamless integration of their consumer electronic devices in their cars. IEEE 802.11 systems are popular for entertainment services inside the car, however due to the fact that IEEE 802.11 use the unlicensed industrial, scientific and medical (ISM) radio bands, the wireless coexistence...
One of the promising techniques to enhance MAC efficiency is orthogonal frequency division multiple access (OFDMA). Even though OFDMA-based WLAN allows multi-user transmissions, it requires a careful design of resource management particularly in densely deployed WLANs. To address this problem, we propose a two-phase resource allocation (TPRA) algorithm. In TPRA, an access points (AP) determines its...
The increase of wireless devices due to the implementation of wireless sensor networks, cyber-physical systems with wireless communication interfaces and mobile monitoring as well as the installation of diagnosis applications into the shop floor improves real-time transparency of machine conditions and production processes. For a minimal invasive integration of such technologies into the brownfield...
For connected vehicles, vehicle ad-hoc network is capable to support various communication-based applications. Specially, WLAN-based vehicular Internet access can be a complementary and cost-effective solution considering the cost of cellular service. For WLAN-based Internet connected vehicles, we propose an efficient load-aware association mechanism which allocates vehicles to roadside APs properly,...
Presently, wireless local area networks (WLANs) are experiencing a tremendous increase of wireless bandwidth hungry devices and the increasing deployment of cloud-based enterprise networks. Additionally, mobile operators with heavily congested cellular networks are exploring the strategy of offload traffic from their cellular networks to WiFi hotspots. Technologies that were originally proposed for...
This paper deals with the problem of severe wireless performance degradation when multiple wireless technologies are concurrently utilized in a same user device. This type of usage is already frequent in most smartphones and laptops, such as streaming Bluetooth audio while using a Wi-Fi download, and is more intensifying with IoT device deployment which triggers the coexistence of heterogeneous wireless...
A heavy deployment of IEEE 802.11 Wireless LANs and limited number of orthogonal channels make lots of Access Points (APs) overlap their interference regions, which greatly increases interferences between APs and stations. In order to cope with the performance degradation caused by the interferences, we propose Co-Fi, a centralized Wi-Fi architecture that effectively coordinates downlink transmissions...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
In this work we implement features for IEEE 802.11ac in the NS-3 simulator, in particular wider channels and bit-error calculations for higher modulation coding schemes. We also implement four wireless LAN deployment scenarios from the 802.11ax working group scenario document, and evaluate their performance under different operating conditions. Our simulation results demonstrate that many nodes in...
We consider a collocated WLAN with Nac 802.11ac users using dynamic 20/40 MHz channel access and Nl 802.11a/n legacy users operating in the secondary 20 MHz channel. Under ideal channel conditions, we seek to characterise the saturation throughput performance of the 802.11ac users and the legacy users. We propose an analytical model based on a decoupling approximation for saturation throughput analysis...
We conduct in this work a comparative study betweena greedy versus limited proposals for resource aggregationin the backhaul of wireless local area networks. We consider asetting with several access points, some with excess backhaulcapacity (providers), and others in shortage of it (beneficiaries) and investigate two approaches for the distribution of resourcesbetween them: a greedy one wherein each...
In IEEE 802.11 based wireless local area networks (WLANs), channel induced errors and collisions cause transmission failures which waste bandwidth and energy. To improve the energy efficiency of battery powered mobile devices we propose a scheme which mitigates channel induced errors and collisions by using two ideas namely, backoff-free fragment retransmission and collision-free transmission schedules,...
A user in IEEE 802.11(Wi-Fi) system must associate to a particular Access Point (AP) to communicate through the Internet. According to the current association method which is based on Receive Signal Strength Index(RSSI), the user first identify its convenient APs and associate with the strongest AP, excluding the fact whether that AP is overloaded or not. In current scenario, the wireless network...
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