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On Optimization Of CSMA/CA Based Wireless LANs: Part I - Impact Of Exponential Backoff
White Papers This paper considers optimization of CSMA/CA based wireless networks such as IEEE 802.11 Wireless LANs. A fundamental component of the MAC layer functionality in such networks is the Binary Exponential Backoff (BEB) of contending nodes which serves...
[January 1, 1970, 0:59]
Enhanced Backoff Scheme In CSMA/CA For IEEE 802.11
White Papers An enhanced CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol to be used in the Medium Access Control (MAC) layer of the IEEE 802.11 standard for Wireless Local Area Networks (wireless LANs) is proposed in this paper.
[January 1, 1970, 0:59]
On Lower Bounds For MAC Layer Contention In CSMA/CA-Based Wireless Networks
White Papers 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...
[January 1, 1970, 0:59]
On Optimization Of CSMA/CA Based Wireless LANs: Part II - Mitigating Efficiency Loss
White Papers Most current deployments of IEEE 802.11 based wireless LANs suffer from various inefficiencies arising from the interactions of MAC and Physical layers. These inefficiencies often limit network users from reaping the full potential of the high...
[January 1, 1970, 0:59]
Performance Analysis Under Finite Load And Improvements For Multirate 802.11
White Papers Automatic rate adaptation in Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) wireless networks may cause drastic throughput degradation for high-speed bit rate STAtions (STAs). The CSMA/CA medium access method guarantees equal long...
[January 1, 1970, 0:59]
Uplink Medium Access Control For WLANs With Multi-Beam Access Point
White Papers This paper considers the CSMA/CA based uplink Medium Access Control (MAC) protocol design for a Wireless Local Area Network (WLAN) with the use of multi-beam directional antennas at the access point. Since all nodes including the access point run...
[January 1, 1970, 0:59]
Modeling The 802.11 Distributed Coordination Function With Heterogenous Finite Load
White Papers Analysis of the 802.11 CSMA/CA mechanism has received considerable attention recently. Bianchi presents an analytic model under a saturated traffic assumption. Bianchi's model is accurate, but typical network conditions are non-saturated and...
[January 1, 1970, 0:59]
Experimental Evaluation Of 802.11e EDCA For Enhanced Voice Over WLAN Performance
White Papers The 802.11e MAC protocol extends the 802.11 CSMA/CA contention mechanism by allowing the adjustment of MAC parameters that were previously fixed. While the 802.11e protocol has been extensively studied, the work discussed in this paper is almost...
[January 1, 1970, 0:59]
A Stochastic Model For Optimizing Physical Carrier Sensing And Spatial Reuse In Wireless Ad Hoc Networks
White Papers In IEEE 802.11 WLANs, Distributed Coordination Function (DCF) or CSMA/CA uses carrier sensing to determine if the shared medium is available before transmitting. Two types of carrier sensing are supported by DCF: mandatory Physical Carrier Sensing...
[January 1, 1970, 0:59]
Collision-Aware Channel Monitoring At The Link Layer Of A Wireless Network
White Papers This paper investigates and proposes a method to address the problem of estimating channel quality at the Medium Access Control (MAC) layer for a CSMA/CA type of wireless LAN that is subject to time-varying impairments.
[January 1, 1970, 0:59]
Joint PHY/MAC Based Link Adaptation For Wireless LANs With Multipath Fading
White Papers However, due to packet overheads and contention times introduced by the CSMA/CA multiple access protocol, effective throughput is much less than the nominal data rates. Wireless local area networks offer a range of transmitted data rates that are...
[January 1, 1970, 0:59]
Performance Analysis Of The IEEE 802.11 Wireless LAN Standard
White Papers To date, detailed performance measures for this CSMA/CA protocol are not known. IEEE 802.11 is a relatively new standard for communication in a wireless LAN. Its need arose from the many differences between traditional wired and wireless LANs and...
[January 1, 1970, 0:59]
A Cross-Layer Framework For Wireless LAN QoS Support
White Papers These technologies are based on CSMA/CA media access with a positive MAC layer acknowledgement and a retransmission mechanism that aids noisy channel propagation condition and eventual undetected collisions.
[January 1, 1970, 0:59]
Analysis Of 802.11 DCF With Heterogeneous Non-Saturated Nodes
White Papers The various physical layer standards that comprise the 802.11 family of protocols all rely upon the same medium access control (MAC) protocol, which is based on CSMA/CA. The successful deployment of IEEE 802.11 Wireless LANs has generated much...
[January 1, 1970, 0:59]
Packet Frame Grouping
White Papers Then the Packet Frame Grouping scheme is presented, which is shown to improve the throughput and reduce the latency over MAC protocols based on CSMA/CA. This paper presents a scheme to improve the performance of radio MAC protocols in the case of...
[January 1, 1970, 0:59]
Which WLAN Technology Is Best?
White Papers The reasons for this are built into the underlying communications process referred to as CSMA/CA. If you've recently installed 802.11g or added it to your existing wireless networks, you've probably discovered that you're not getting anywhere near...
[January 1, 1970, 0:59]
Bidirectional Optical Ring Network Having Enhanced Load Balancing And Protection
White Papers OTDM technology is used for statistical traffic multiplexing while reservation-based, token-rotation, and CSMA/CA with a backpressure control techniques can be used for access to the shared medium at the link layer.
[July 10, 2008, 1:01]
Adaptive CSMA For Scalable Network Capacity In High-Density WLAN: A Hardware Prototyping Approach
White Papers It is argued that the CSMA/CA parameters in 802.11 MAC protocol need to be adaptive to the changing network topology, traffic and interference. Fast proliferation of 802.11 devices has led to the emergence of High-Density WLAN where 100s-1000s...
[January 1, 1970, 0:59]
Joint Route And Power Assignment In Asynchronous Multi-Hop Wireless Networks
White Papers Numerical comparisons suggest that allowing a controlled level of interference may lead to better utilization of available spectrum than prohibiting interference via CSMA/CA. The paper considers constructive techniques for joint route and transmits...
[January 1, 1970, 0:59]
Comparing Energy-Saving MAC Protocols For Wireless Sensor Networks
White Papers This paper present a study on the energy saved by two MAC protocols optimized for wireless sensor networks, S-MAC and T-MAC, in comparison to standard CSMA/CA. Applications for wireless sensor networks have notably different characteristics and...
[January 1, 1970, 0:59]
