Recent IEEE 802.11 Headlines
IEEE Measuring Pulsed Interference in 802.11 Links
Wireless IEEE 802.11 links operate in unlicensed spectrum and so must accommodate other unlicensed transmitters that generate pulsed interference. We propose a new approach for detecting the presence of pulsed interference affecting 802.11 links and for estimating temporal statistics of this interference. This approach builds on recent work on distinguishing collision losses from noise losses in 802.11 links. When the intervals between interference pulses are i.i.d., the approach is not confined to estimat...
IEEE Cooperative Carrier Signaling: Harmonizing Coexisting WPAN and WLAN Devices
The unlicensed ISM spectrum is getting crowded by wireless local area network (WLAN) and wireless personal area network (WPAN) users and devices. Spectrum sharing within the same network of devices can be arbitrated by existing MAC protocols, but the coexistence between WPAN and WLAN (e.g., ZigBee and WiFi) remains a challenging problem. The traditional MAC protocols are ineffective in dealing with the disparate transmit-power levels, asynchronous time-slots, and incompatible PHY layers of such heterogeneo...
IEEE Experiences With a Centralized Scheduling Approach for Performance Management of IEEE 802.11 Wireless LANs
We present a centralized integrated approach for: 1) enhancing the performance of an IEEE 802.11 infrastructure wireless local area network (WLAN), and 2) managing the access link that connects the WLAN to the Internet. Our approach, which is implemented on a standard Linux platform, and which we call ADvanced Wi-fi Internet Service EnhanceR (ADWISER), is an extension of our previous system WLAN Manager (WM). ADWISER addresses several infrastructure WLAN performance anomalies such as mixed-rate inefficienc...
IEEE Mobile Data Offloading: How Much Can WiFi Deliver?
This paper presents a quantitative study on the performance of 3G mobile data offloading through WiFi networks. We recruited 97 iPhone users from metropolitan areas and collected statistics on their WiFi connectivity during a two-and-a-half-week period in February 2010. Our trace-driven simulation using the acquired whole-day traces indicates that WiFi already offloads about 65% of the total mobile data traffic and saves 55% of battery power without using any delayed transmission. If data transfers can be ...
IEEE Model-Driven Optimization of Opportunistic Routing
Opportunistic routing aims to improve wireless performance by exploiting communication opportunities arising by chance. A key challenge in opportunistic routing is how to achieve good, predictable performance despite the incidental nature of such communication opportunities and the complicated effects of wireless interference in IEEE 802.11 networks. To address the challenge, we develop a model-driven optimization framework to jointly optimize opportunistic routes and rate limits for both unicast and multi...
BBC Wi-fi shut down in Guantanamo alert
The US military's wireless internet service inside Guantanamo Bay has been shut down following threats by Anonymous hackers
The Register Aha, I see you switched on your mobile Wi-Fi. YOU FOOL!
PNL bug still leaving door open to hackers - security bod
Security expert Raul Siles has warned that years after it was first identified, the Preferred Networks List (PNL) Wi-Fi bug remains unaddressed on many an iPhone, Android phone, and Windows or BlackBerry handset.…
Network World Cisco Catalyst marries wired, wireless and SDN in one switch
Cisco this week unveiled a new Catalyst switch and WLAN controller designed to converge wired and wireless networks and centralize management of both environments.
Network World How to Stay Safe on Public Wi-Fi
Picture this: You're at a café with your laptop and latte in hand, getting ready to review new sales leads and the quarterly financial projections. First you hop on the free Wi-Fi that the shop's management provides. Then you connect your laptop to a projector so that the entire café can take a look, and finally you hand out some printed copies of your confidential product specifications to the other patrons so that they can follow along.
Network World How Wi-Fi attackers are poisoning Web browsers
Public Wi-Fi networks such as those in coffee shops and airports present a bigger security threat than ever to computer users because attackers can intercede over wireless to "poison" users' browser caches in order to present fake Web pages or even steal data at a later time. That's according to security researcher Mike Kershaw, developer of the Kismet wireless network detector and intrusion-detection system, who spoke at the Black Hat conference.
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