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- Contention-Aware Analysis of Routing Schemes for Mobile Opportunistic Networks
- A large body of work has theoretically analyzed the performance of routing schemes for mobile opportunistic networks. But a vast majority of these prior studies have ignored wireless contention. This paper analyzes the performance of routing schemes under contention. To model contention the paper uses the recently-proposed analytical framework which...
- Tags: Contention, Aware, Mobile, Network, Scheme, Analysis, Advertising & Promotion, Wi-Fi, Wireless, Networking, Marketing
- White papers 2007-06-11
- Memory and Network Bandwidth Aware Scheduling of Multiprogrammed Workloads on Clusters of SMPs
- Symmetric Multiprocessors SMPs, combined with modern interconnection technologies are commonly used to build cost-effective compute clusters. However, contention among processors for access to shared resources, as is the main memory bus and the NIC can limit their efficiency significantly. This paper first provides an experimental demonstration of the effect of...
- Tags: Algorithm, Contention, Aware, Bandwidth, Network, Memory, IEEE, Engineering, Networking, Processors, Semiconductors, Hardware, Components
- White papers 2006-07-26
- 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
- Performance Analysis of Contention Based Medium Access Control Protocols
- This paper studies the performance of contention based Medium Access Control MAC protocols. This paper provides a simple and accurate method for estimating the throughput of IEEE 802.11 DCF and IEEE 802.11e EDCA. The method is based on a rigorous analysis of the Markov chain associated with the back-off process...
- Tags: Method, Contention, IEEE 802.11, MAC, Performance, Protocol, Wireless LANs, Wi-Fi, Wireless
- White papers 2006-01-02
- Z-MAC: A Hybrid MAC for Wireless Sensor Networks
- This paper presents the design, implementation and performance evaluation of a hybrid MAC protocol, called Z-MAC, for wireless sensor networks that combines the strengths of TDMA and CSMA while offsetting their weaknesses. Like CSMA, Z-MAC achieves high channel utilization and low-latency under low contention and like TDMA, achieves high channel...
- Tags: Contention, MAC, Performance, Network, TDMA, Sensor, Association For Computing Machinery, Z-MAC, Performance Management, Cellular Phones, Wi-Fi, Wireless, Human Resources, Workforce Management, Consumer Electronics, Personal Technology
- White papers 2005-11-04
- Say 'no thanks' the right way with this sample rejection letter
- One of the least pleasant aspects of the hiring process is conveying to candidates your decision to pass them over. But if you've decided to eliminate someone from contention for a particular spot, it's professional courtesy to let that person know. It's also a good business practice to handle the...
- Tags: job, hiring, friendly, respect, contention
- Download resources 2005-09-29
- On Lower Bounds for MAC Layer Contention in CSMA/CA-Based Wireless Networks
- Wireless LANs operating within unlicensed frequency bands require random access schemes such as CSMA/CA, so that wireless networks from different administrative domains for example wireless community networks may co-exist without central coordination, even when they happen to operate on the same radio channel. Yet, it is evident that this lack...
- Tags: Contention, MAC, Network, Wireless Network, Wi-Fi, Wireless
- White papers 2005-09-02
- Understanding 802.11e Contention-Based Prioritization Mechanisms and Their Coexistence With Legacy 802.11 Stations
- The IEEE 802.11e task group has reached a stable consensus on two basic contention-based priority mechanisms to promote for standardization: usage of different arbitration interframe spaces and usage of different minimum/maximum contention windows. The goal of this paper is to provide a thorough understanding of the principles behind their operation....
- Tags: Contention, IEEE 802.11, Performance, IEEE, Performance Management, Human Resources, Workforce Management
- White papers 2005-07-01
- TechNet Webcast: SQL Server 2005 Series (Part 3 of 10): Achieving Greater Concurrency (Level 200)
- SQL Server 2005 provides enhancements to enable greater concurrency and significantly reduce lock contention. The presenter of this webcast shows how to use Snapshot Isolation to reduce currency contention. The attendee will gain an understanding of database snapshots and replication for scaling and read-only views, and learn how Dynamic Management...
- Tags: Contention, Webcast, Microsoft SQL Server, Microsoft SQL Server 2005, Microsoft TechNet, Databases, Digital Media, Storage, Enterprise Software, Software, Data Management, Consumer Electronics, Personal Technology, Hardware
- Webcasts
- Bandwidth Contention With Backpressure Scheme Over VDSL Network
- Bandwidth Contention in VDSL network occurs whenever the demand of bandwidth consumption exceeds the network capacity per se, causing lower throughputs and higher traversal time delays. If the bandwidth contention cannot be ease nor appropriately controlled, some sessions transported by the network may not meet their Quality-of-Services QoS. An existing...
- Tags: Contention, QoS, VDSL, Network, DSL, Networking, Telecommunications, Personal Technology
- White papers 2006-02-01
- Memory Bandwidth Aware Scheduling for SMP Cluster Nodes
- Clusters of SMPs are becoming increasingly common. However, the shared memory design of SMPs and the consequential contention between system processors for access to main memory can limit their efficiency significantly. This paper first provide experimental evidence that contention on the shared memory bus can have major impact on the...
- Tags: Contention, Aware, Memory, Memory Bandwidth, IEEE, Flash Memory, Processors, Semiconductors, Hardware, Components
- White papers 2006-07-26
Additional Resources
- Monitoring Internet Bandwidth and Contention Ratio provided by ISP:
- If you are using VSAT,How can you tell that your Internet Service Provider is actually giving you the bandwith within and which they claim, includes the contention ratio you are siited on Grouped in if using KU-Band shared.
- Tags: Internet service providers (ISPs), margaretk4@..., monitoring
- Discussion threads 2007-04-03
- TCP Contention Control: A Cross Layer Approach to Improve TCP Performance in Multihop Ad Hoc Networks
- It is well known that one of the critical sources of TCP poor performance in multihop ad hoc networks lies in the TCP window mechanism that controls the amount of traffic sent into the network. This paper proposes a novel cross layer solution called "TCP Contention Control" that dynamically adjusts...
- Tags: TCP, Tcp/Ip, Networking
- White papers 2007-01-02
- Evaluating and Improving TCP Performance Against Contention Losses in Multihop Ad Hoc Networks
- Default TCP treats all losses as congestion since it was designed and optimized to work in networks with low non-congestion losses. In this paper first it is shown that the dominant cause of packet drops in multihop ad hoc network is medium access contention and congestion losses, are very rare....
- Tags: City University, Loss, TCP, Default TCP, Tcp/Ip, Networking
- White papers 2005-06-29
- 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
- RAIN: A Reliable Wireless Network Architecture
- Despite years of research and development, pioneering deployments of multihop wireless networks have not proven successful. The performance of routing and transport is often unstable due to contention-induced packet losses, especially when the network is large and the offered load is high. This paper proposes RAIN, a reliable wireless network...
- Tags: Network, Wireless Network, RAIN Network, Wi-Fi, Wireless, Networking
- White papers 2008-01-01
- Performance Evaluation of an Adaptive Backoff Scheme for WLAN
- In this paper, a simple self-adaptive contention window adjustment algorithm for 802.11 Wireless Local Area Networks WLAN is proposed and analyzed. Numerical results show that the new algorithm outperforms the standard 802.11 window adjustment algorithm. Compared with the standard and previously proposed enhancement algorithms, a salient feature of the algorithm...
- Tags: Algorithm, Performance, Window, WLAN, Performance Evaluation, Window Adjustment Algorithm, Wireless LANs, LANs, Engineering, Construction, Wi-Fi, Wireless, Networking
- White papers 2004-11-25
- A New Backoff Algorithm for the IEEE 802.11 Distributed Coordination Function
- In the IEEE 802.11 Wireless Local Area Networks WLANs, network nodes experiencing collisions on the shared channel need to backoff for a random period of time, which is uniformly selected from the Contention Window CW. This contention window is dynamically controlled by the Binary Exponential Backoff BEB algorithm. The BEB...
- Tags: Algorithm, IEEE 802.11, Syracuse University, Wireless LANs, Engineering, Wi-Fi, Wireless
- White papers
- Performance Enhancement in OBS Network With Flow Control and Edge Delay Method
- This paper examines burst contention resolution problems in Optical Burst Switching OBS networks. Since burst contentions take place when the network is congested by increased input traffic, or two or more bursts demand the same wavelength exactly at the same time even though there is no congestion. From these insights,...
- Tags: Algorithm, Performance, Burst, Engineering
- White papers 2006-03-17
- Distributed Flow Control and Medium Access in Multihop Ad Hoc Networks
- Recent studies have shown that the performance of wireless multihop ad hoc networks is very poor. This paper demonstrates that one important reason of the poor performance is the close coupling between medium contention and network congestion. Therefore, it presents a framework of distributed flow control and medium access control...
- Tags: Microsoft Access, MAC, Network, University Of Florida, Network Congestion, Networking
- White papers 2006-04-04
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