A New Backoff Algorithm for the IEEE 802.11 Distributed Coordination Function
White Papers This paper proposes a new backoff algorithm, termed the Linear/Multiplicative Increase and Linear Decrease (LMILD) backoff algorithm, for use with the IEEE 802.11 Distributed Coordination Function. In the IEEE 802.11 Wireless Local Area Networks...
[January 31, 2009, 6:23]
Evaluation of Quality of Service Schemes for IEEE 802.11 Wireless LANs
White Papers This paper evaluates four mechanisms for providing service differentiation in IEEE 802.11 wireless LANs, the Point Coordinator Function (PCF) of IEEE 802.11, the Enhanced Distributed Coordinator Function (EDCF) of the proposed IEEE 802.11e...
[March 16, 2009, 5:02]
A Queueing Model for Finite Load IEEE 802.11 Random Access MAC
White Papers This paper presents an analytic model for evaluating the MAC layer queueing delays at wireless nodes using the Distributed Coordination Function of IEEE 802.11 MAC specifications. The model is valid for finite loads and can account for arbitrary...
[November 8, 2006, 0:00]
Mitigating the Exposed Node Problem in IEEE 802.11 Ad Hoc Networks
White Papers The IEEE 802.11 Distributed Coordination Function (DCF) MAC protocol continues to suffer from the hidden and exposed node problems which characterize CSMA-based protocols. This paper describes enhancements to the IEEE 802.11 DCF MAC Protocol which...
[July 7, 2006, 0:00]
Performance Issues With IEEE 802.11 in Ad Hoc Networking
White Papers Thus, studies in wireless multi-hop networks, also called ad hoc networks often rely on the use of the IEEE 802.11 standard for the physical and MAC layers. Although 802.11 was initially designed for infrastructure-based networks, the Distributed...
[July 20, 2007, 6:07]
Protecting Wireless Networks Against a Denial of Service Attack Based on Virtual Jamming
White Papers The IEEE 802.11 MAC scheme may suffer from a number of vulnerabilities due to the use of the virtual carrier-sense function. This paper has proposed a NAV validation scheme to eliminate such vulnerabilities and to successfully defend against a...
[June 24, 2009, 16:02]
An Enhancement to the IEEE 802.11e EDCA Providing QoS Guarantees
White Papers In order to support applications with QoS requirements, the upcoming IEEE 802.11e standard enhances the original IEEE 802.11 MAC protocol by introducing a new coordination function which has both contention-based and contention-free medium access...
[May 12, 2006, 0:00]
Performance of Wireless LANs Based on IEEE 802.11 MAC Protocols
White Papers IEEE 802.11 MAC protocol has been the standard for Wireless LANs, and also adopted in many network simulation packages for wireless multi-hop ad hoc networks. However, it is well known that, as the traffic goes up, the performance of IEEE 802.11...
[January 18, 2006, 0:01]
Performance Analysis of IEEE 802.11 MAC Protocols in Wireless LANs
White Papers Tt is well known that, as the number of active stations increases, the performance of IEEE 802.11 MAC protocol in terms of delay and throughput degrades dramatically, especially when each station's load approaches its saturation state.
[January 18, 2006, 0:01]
Smart Power-Saving Mode for IEEE 802.11 Wireless LANs
White Papers Static PSM (Power-Saving Mode) schemes employed in the current IEEE 802.11 implementations could not provide any delay-performance guarantee because of their fixed wakeup intervals. First, it translates an arbitrary user-desired delay performance...
[January 20, 2006, 0:01]
Expected Data Rate: An Accurate High-Throughput Path Metric for Multi-Hop Wireless Routing
White Papers The transmission interference model also takes the non-optimality of IEEE 802.11 medium access scheduling into account. This paper constructs a realistic and practical transmission interference model by determining transmission contention degree of...
[August 23, 2007, 1:00]
HP ProCurve Wireless Edge Services zl Module review
Reviews The RP230 is a dual-radio IEEE 802.11 device that supports simultaneous 802.11a and b/g connections. The Radio Port 230 is a Power Over Ethernet (POE) device, so it need only be connected to the 8212zl switch by a single Ethernet cable in order to...
[December 18, 2007, 8:03]
Performance Analysis of the IEEE 802.11 Wireless LAN Standard
White Papers IEEE 802.11 is a relatively new standard for communication in a wireless LAN. This paper describes the results of the Discrete-Event Simulation of the Distributed Coordination Function (DCF) within the MAC sublayer.
[May 12, 2006, 1:00]
Modeling Signal Attenuation in IEEE 802.11 Wireless LANs - Vol. 1
White Papers The measurements were performed using off-the-shelf IEEE 802.11b hardware and with distances varying from 1 to 50 meters. Path loss models are used to approximate signal attenuation as a function of the distance between transmitters and receivers...
[February 7, 2006, 23:00]
