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enhanced distributed channel access

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Saturation Throughput of IEEE 802.11e EDCA Based on Mean Value Analysis: The IEEE 802.11-based wireless LANs have been widely deployed for local area high-speed data access. The IEEE 802.11e amendment aims at providing QoS provisioning to support real-time multimedia traffic in WLANs. The Enhanced Distributed Channel Access EDCA is a QoS extension of the Distributed Coordination Function DCF in IEEE 802.11a/b/g....; Tags: University Of British Columbia, IEEE, Analysis, Enhanced Distributed Channel Access, Wireless LANs, LANs, Wi-Fi, Wireless, Networking; White papers 2006-01-21

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A Distributed Channel Access Scheme With Guaranteed Priority and Enhanced Fairness: Although the IEEE 802.11e Enhanced Distributed Channel Access EDCA can differentiate high priority traffic such as real-time voice from low priority traffic such as delay-tolerant data, it can only provide statistical priority, and is characterized by inherent short-term unfairness. This paper proposes a new distributed channel access scheme through minor...; Tags: Microsoft Access, Traffic, IEEE, Microsoft Office, Telecommunications, Databases, Office Suites, Software, Enterprise Software, Data Management; White papers 2006-03-28
Performance Analysis of QoS Supported by Enhanced Distributed Channel Access (EDCA) Mechanism in IEEE 802.11e: With fast deployment of Wireless Local Area Networks WLANs, the ability of WLAN to support real time services with stringent Quality of Service QoS requirements has come into fore. This paper evaluates the capability of QoS support in Enhanced Distributed Channel Access EDCA mechanism of the IEEE 802.11e standard, which...; Tags: QoS, Performance, WLAN, IEEE, Jamia Millia Islamia, Wireless LANs, LANs, Wireless, Networking; White papers 2007-02-13
Comparison of Modified Dual Queue and EDCA for VoIP Over IEEE 802.11 WLAN: The popular IEEE 802.11 WLAN today does not provide any Quality-of-Service QoS because of its contention-based channel access nature of the Medium Access Control MAC. Therefore, this paper proposes a simple software upgrade-based solution, called a dual queue scheme, to provide QoS to real-time services such as Voice-over-IP VoIP in...; Tags: Contention, IEEE 802.11, Seoul National University, QoS, MAC, Telephony, Wireless LANs, VOIP, Telecommunications, Networking, Wireless; White papers 2006-03-20
A Self-Managed Distributed Channel Selection Algorithm for WLANs: This paper considers the problem of a wireless LAN selecting a channel to minimise interference with other WLANs. The focus is on interfering infrastructure-mode networks, where each Access Point AP or base station has a wired backhaul link. The paper introduces a new fully distributed and self-managed channel selection algorithm...; Tags: Algorithm, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Networking; White papers 2005-12-15

48-Bit Absolute Internet and Ethernet Host Numbers: Xerox internets and Ethernet local computer networks use 48"bit absolute host numbers. This paper describes how the host numbering scheme was designed in the context of an overall internet-work and distributed systems architecture. The Ethernet local computer network is a multi-access, packet-switched communications system for carrying digital data among locally...; Tags: Xerox Corp., Ethernet, Network Technology, Networking, Internet; White papers 2007-08-24
Queueing Delay Analysis of IEEE 802.11e EDCA: The majority of analytical work on the performance of IEEE 802.11 focuses on predicting the throughput and the mean delay of only the medium access, although higher layer applications and protocols are interested in the total performance of the MAC layer. Seen in this perspective, surprisingly little focus has been...; Tags: Telenor, IEEE, Analysis, Z-transform, Performance Management, Wireless LANs, Human Resources, Workforce Management, Wireless; White papers 2005-11-06
Distributed Load Balancing Algorithm for Adaptive Channel Allocation for Cognitive Radios: The problem of channel allocation has been extensively studied in the context of cellular networks. There is a substantial amount of work in the field of dynamic frequency assignment for WLANs and mesh networks as well. The growing interest in the cognitive radio technology and its capability to offer more...; Tags: Algorithm, Load Balancing, Radio, Allocation, Advertising & Promotion, Mesh Networking, Marketing, Networking; White papers 2007-08-01
Impact of 802.11e EDCA on Mixed TCP-Based Applications: There has been an explosive growth in the use of wireless LANs WLANs to support network applications ranging from web-browsing and file-sharing to voice calls. It is difficult to optimally con-figure WLAN components, such as access points APs, to meet the quality-of-service requirements of the different applications, as well as...; Tags: QoS, WLAN, TCP, Tcp/Ip, Wireless LANs, LANs, Wi-Fi, Wireless, Networking; White papers 2006-06-27
Adaptive Channel Selection Through Collaborative Sensing: Proper channel selection is essential to exploit the benefits of multi-channel systems by distributing conflicting transmissions across non-interfering channels. Critical to channel selection is the channel quality metric. This paper proposes a Busy Time Ratio BTR metric that captures channel contention and user traffic load under a variety of network...; Tags: Channel Selection, Wireless LANs, Engineering, Networking, Wi-Fi, Wireless; White papers 2006-03-02
An Analytic Study of Tuning Systems Parameters in IEEE 802.11e Enhanced Distributed Channel Access: This paper derives, based on the analytical model developed by Cali et al., a multi-class model to study how to adaptively tune all the parameters in IEEE 802.11e EDCA and support service differentiation in WLANs. Through analytical modeling, it demonstrates that by assigning appropriate different transmission probabilities (or contention window...; Tags: University Of Illinois, Parameter, Microsoft Access, IEEE, Construction, Research & Development, Wireless LANs, LANs, Business Operations, Wireless, Networking; White papers
Throughput and Transmission Capacity of Ad Hoc Networks With Channel State Information: This paper develops a general framework for deriving the spatial throughput and transmission capacity of spatially Poisson distributed ad hoc networks for random (e.g., fading) channels, and random transmission distances. In both of these scenarios the randomness of the channels and ranges invariably lowers both throughput and transmission capacity assuming...; Tags: Channel, Advertisement, Throughput, Transmission Capacity, Networking; White papers 2006-07-05
Admission Region of Multimedia Services for EDCA in IEEE 802.11e Access Networks: This paper presents a simulation analysis for the evaluation of the admission region of a IEEE 802.11e network adopting the EDCA Enhanced Distributed Channel Access mechanism. In particular, this paper gives an estimate of the number of QoS-aware applications, namely videoconference and Voice over IP VoIP, that can be admitted...; Tags: Multimedia, QoS, Microsoft Access, Network, IEEE, Telephony, VOIP, Telecommunications, Networking; White papers 2004-12-22
Supporting QoS in IEEE 802.11e Wireless LANs: In the emerging IEEE 802.11e MAC protocol, the Enhanced Distributed Channel Access EDCA is proposed to support prioritized QoS; however, it cannot guarantee strict QoS required by real-time services such as voice and video without proper network control mechanisms. To overcome this deficiency, an analytical model is built to derive...; Tags: QoS, WLAN, IEEE, Wireless LANs, LANs, Wireless, Networking; White papers 2005-09-15
The 802.11 MAC Protocol Leads to Inefficient Equilibria: Wireless Local Area Networks WLANs based on the family of 802.11 technologies are becoming ubiquitous. In non-cooperative environments such as public hot-spots or WLANs operated by different enterprises that are physically close to each other, individual nodes attempt to maximize their achieved throughput by adjusting the data rate or frame...; Tags: IEEE 802.11, MAC, Massachusetts Institute Of Technology, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Networking; White papers
C-MAC: A Cognitive MAC Protocol for Multi-Channel Wireless Networks: A number of algorithmic and protocol assumptions taken for granted in the design of existing wireless communication technologies need to be revisited in extending their scope to the new Cognitive Radio CR paradigm. The fact that channel availability can rapidly change over time and the need for coordinated quiet periods...; Tags: MAC, Network, Wireless Communication, Wireless Network, Wi-Fi, Wireless; White papers 2007-02-16
Performance of Space-Time Block Coded OFDM in Time-Selective Macrocell Channel Environments: Space-time coding was first introduced based on the quasi-static fading channel assumption. In this paper, this assumption is not used as it is assumed that the channel is time-selective Rayleigh fading. As such the orthogonality between subcarries in time-selective channel will not hold, resulting in interchannel interference ISI. To combat...; Tags: Channel, Performance, Environment, IEEE, OFDM, Wireless; White papers 2006-09-26
CRM User Adoption Rate Soars From 50% to 90% After Quantum Implements Salesforce: Quantum required new solution to support renewed focus on channel sales efforts & processes. The solution must be easily deployed across the U.S., EMEA, & AsiaPac. Quantum needed CRM solution to be capable of tracking channel sales results. The company selected salesforce.com over conventional client/server software. They Quickly upgraded to...; Tags: Salesforce.com Inc., Quantum Corp., CRM, Sales Strategy, Sales Force Management, Sales; Case studies
An Enhancement to the IEEE 802.11e EDCA Providing QoS Guarantees: One of the challenges that must be overcome to realize the practical benefits of ad hoc networks is Quality of Service QoS. However, the IEEE 802.11 standard, which undeniably is the most widespread wireless technology of choice for WLANs and ad hoc networks, does not address this issue. In order...; Tags: QoS, IEEE, Lund University, Wireless LANs, Wi-Fi, Wireless; White papers
On Channel Selection Strategies for Multi-Channel MAC Protocols in Wireless Ad Hoc Networks: Multi-channel Medium Access Control MAC protocols have recently been proposed to improve the performance of the Transmission Control Protocol TCP in IEEE 802.11 wireless ad hoc networks. This paper uses ns-2 network simulations to study the impact of channel selection techniques on multi-channel MAC protocol performance, particularly for the Bi-directional...; Tags: MAC, Network, University Of Calgary, Wireless, Tcp/Ip, Strategy, Networking, Management; White papers 2006-04-11

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