IEEE 802.11 Resources on ZDNet

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Airport Express, holding up the revolution?: With Apple's announcement of the MacBook Air they've clearly stated that the future is wire free and that hard wired connections are dead. The MBA Apple has done away with the traditional Ethernet port that's graced almost every previous Apple portable. Sure, you can add Ethernet with...; Tags: Apple AirPort Express, IEEE 802.11, Home Stereo, IEEE 802.11n, Apple Inc., MBA Apple, Wireless LANs, Ethernet, Wi-Fi, Wireless, Networking, Jason D. O\'Grady; Blog posts 2008-01-28
Capacity Coverage & Deployment Considerations for IEEE 802.11g: 802.11g is an exciting new technology that offers additional performance, while providing investment protection for 802.11b clients through backward compatibility. By using previous technologies and economies of scale, 802.11g devices are available at little or no additional cost relative to 802.11b. As such, there are many reasons to begin migrating...; Tags: IEEE 802.11, IEEE 802.11g, Wi-Fi, Wireless, Wireless LANs; White papers 2007-12-01
Calling the i-Mate Ultimate 9502 a PDA is like calling Rolex a watch: Here at CTIA I've just seen a demo of the i-Mate Ultimate 9502, a forthcoming (think by end of this year) high-end Windows Mobile-powered device. Looks like a PDA but that's like saying that the Rolex tells time. Just a few...; Tags: PDA, IEEE 802.11, Video, Camera, PDAs, Wireless LANs, Corporate Communications, 3G, Wi-Fi, Handhelds, Keyboards, Wireless, Hardware, Marketing, Cellular Phones, Consumer Electronics, Personal Technology, Peripherals, Russell Shaw; Blog posts 2007-10-24
Extended Abstract: Understanding the Effect of Access Point Density on Wireless LAN Performance: This paper presents a systematic experimental study of the effect of inter-cell interference on IEEE 802.11 performance. With increasing penetration of WiFi into residential areas and usage in ad hoc conference settings, chaotic un-planned deployments are becoming the norm rather than an exception. These networks often operate many nearby access...; Tags: IEEE 802.11, New Jersey, WLAN, Access Point, Wireless LANs, Wireless, Wi-Fi; White papers 2007-09-14
An Experimental Study on the Capture Effect in 802.11a Networks: In wireless networks, a frame collision does not necessarily result in all the simultaneously transmitted frames being lost. Depending on the relative signal power and the arrival timing of the involved frames, one frame can survive the collision and be successfully received by the receiver. Using the IEEE 802.11a wireless...; Tags: IEEE 802.11, Network, Frame, Collision, Association For Computing Machinery, Wireless Network, Wireless LANs, Wi-Fi, Wireless, Networking; White papers 2007-09-10

On the Performance of IEEE 802.11 Under Jamming: This paper studies the performance of the IEEE 802.11 MAC protocol under a range of jammers that covers both channel-oblivious and channel-aware jamming. The paper studies two channel-oblivious jammers: a periodic jammer that jams deterministically at a specified rate, and a memoryless jammer whose signals arrive according to a Poisson...; Tags: IEEE 802.11, Northeastern University, Performance, Wireless LANs, Performance Management, Wi-Fi, Wireless, Human Resources, Workforce Management; White papers 2007-07-08
Optimizing Aggregate Throughput of Upstream TCP Flows Over IEEE 802.11 Wireless LANS: This paper via analysis and simulation revisits the interaction between MAC contention and TCP congestion control over IEEE 802.11 WLANs, misled in the previous efforts. The results reveal that the effective number of contending wireless stations is not proportional to the number of wireless stations with an upstream TCP flow...; Tags: IEEE 802.11, TCP, Tcp/Ip, Wireless LANs, Networking, Wi-Fi, Wireless; White papers 2007-07-04
The role of 802.11n in the Enterprise: As the 802.11n standard gets closer to final ratification, Enterprises are beginning to wonder how this may impact their Wireless LAN strategy in the coming year and beyond. For organizations that may choose to deploy 802.11n, it will have serious upgrade implications for both the infrastructure and the client side...; Tags: Networking, Mobile/Wireless, Intel, Infrastructure, Hardware, Desktop; Blog posts 2007-06-19
Project: Wireless Throughput: There have been different opinions on what happens when a person adds an 802.11b device to an 802.11g access point that is supporting other 802.11g devices. What really is the truth on this subject? The project discussed in this paper looks at what happens to the bandwidth as a direct...; Tags: IEEE 802.11, IEEE 802.11g, East Carolina University, Wi-Fi, Wireless, Wireless LANs; White papers 2007-04-12
TCP Dynamics in 802.11 Wireless Local Area Networks: In 802.11 wireless links with disabled MAC retries, data and ACK packets within a TCP session collide resulting in packet losses. This paper shows that in this situation, certain popular optimizations of TCP (fast-recovery) worsen the performance by causing deadlocks that terminate with timeouts. The performance of optimized TCP versions...; Tags: IEEE 802.11, LAN, Network, WLAN, TCP, Wireless, Tcp/Ip, Networking; White papers 2007-03-01
Beacon-Stuffing: Wi-Fi Without Associations: This paper presents beacon-stuffing, a low bandwidth communication protocol for IEEE 802.11 networks that enables APs to communicate with clients without association. This enables clients to receive information from nearby APs even when they are disconnected, or when connected to another AP. The scheme is complimentary to 802.11 association and...; Tags: IEEE 802.11, Associated Press, Association, Wireless LANs, Wi-Fi, Wireless; White papers 2007-02-10
Proactive Scan: Fast Handoff With Smart Triggers for 802.11 Wireless LAN: It has been a challenging problem to support VoIP-type delay sensitive applications in an 802.11 wireless LAN because the standard handoff procedure implemented in many current 802.11 products occurs a delay deem unacceptable to VoIP users. To reduce this delay, the authors have developed a fast handoff scheme called Proactive...; Tags: Technique, 802.11 Wireless LAN, IEEE 802.11, Handoff, Wireless LANs, Wi-Fi, Wireless, Productivity; White papers 2007-01-29
802.11n - The consequences of abandoning the 5 GHz frontier: When 802.11b first started getting popular in late 2000, no one imagined that it would still be the most dominant standard 6 years later and continue to dictate the design of the latest wireless LAN products because it is the lowest common denominator. As with any technology that is...; Tags: Infrastructure, Mobile/Wireless, Networking, News, Hardware, IEEE 802.11; Blog posts 2007-01-24
Distributed Channel Assignment in Multi-Radio 802.11 Mesh Networks: To increase the utilization of the available frequency channel space in 802.11-based wireless mesh networks, recent work has explored solutions based on multi-radio stations. This paper reports on the design and experimental study of a distributed, self-stabilizing mechanism that assigns channels to multi-radio nodes in wireless mesh networks. It takes...; Tags: IEEE 802.11, Network, Mesh Networking, Wireless LANs, Wi-Fi, Wireless, Networking; White papers 2007-01-04
Link-Layer Fragmentation and Retransmission Impact on TCP Performance in 802.11-Based Networks: The objective of this paper is to examine the behavior of TCP in 802.11-based networks. The focus of this work is mainly on the effect of the fragmentation and frames retransmission handled at the MAC layer on the TCP end-to-end performance. The packet loss rate and the end-to-end delay of...; Tags: IEEE 802.11, Network, TCP, Tcp/Ip, Networking; White papers 2007-01-01
Queue Management Strategies to Improve TCP Fairness in IEEE 802.11 Wireless LANs: Wireless Local Area Networks (WLANs) based on the IEEE 802.11 technology have become increasingly popular and ubiquitous. The 802.11 standard allows each station in a WLAN equal opportunity to access the wireless channel, which can result in unfair sharing of network bandwidth between upstream and downstream TCP flows at an...; Tags: Strategy, IEEE 802.11, Network, University Of Calgary, WLAN, TCP, Wireless LANs, LANs, Wi-Fi, Tcp/Ip, Wireless, Networking; White papers 2007-01-01
Wireless Virtualization on Commodity 802.11 Hardware: This paper describes specific challenges in virtualizating a wireless network and multiple strategies to address them. Among different possible wireless virtualization strategies, the current work in this domain is focussed on a Time-Division Multiplexing (TDM) approach. Hence, the paper presents the experiences in the design and implementation of such TDM-based...; Tags: IEEE 802.11, University Of Wisconsin-Madison, Wireless Virtualization System, Virtualization, Wi-Fi, Wireless, Storage Management, Utility Computing, Hardware, Storage; White papers 2006-12-29
Modeling and Analysis of TCP Dynamics Over IEEE 802.11 WLAN: Today, IEEE 802.11 Wireless LAN (WLAN) is a prevailing solution for the wireless Internet access while Transport Control Protocol (TCP) is the dominant transport protocol in the Internet. It is known that, in the infrastructure WLAN with multiple long-lived TCP flow stations, the actual number of contending TCP stations is...; Tags: IEEE 802.11, Seoul National University, Station, WLAN, TCP, Analysis, Modeling, Wireless LANs, LANs, Wi-Fi, Wireless, Internet, Networking; White papers 2006-12-01
Free hardware code a bad hack: Free hardware code a bad hackCan you find a backer?> I happen to think that, with good GPL code, > an 802.11 router would make an excellent > application platform, in medical monitoring, > home automation, and home inventory > applications. The problem isn't just that > hardware makers don't...; Tags: Wireless LANs, Home networking, Network technology, hardware, open source, Linksys Inc., IEEE 802.11, router; Discussion threads 2006-11-02
Evaluating TCP With Corruption Notification in an IEEE 802.11 Wireless LAN: Reliable transport protocols like TCP perform very well on wired computer networks; packet loss is primarily caused by congestion and much less frequently due to physical or link layer problems. On the other hand, in wireless links TCP performance is degraded due to excessive packet loss on the physical layer,...; Tags: IEEE 802.11, Congestion, TCP, Tcp/Ip, Networking; White papers 2006-11-01