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layer adaptation

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Impact of Upper Layer Adaptation on End-to-End Delay Management in Wireless Ad Hoc Networks: A good amount of research has been developed to support QoS issues in IEEE 802.11 ad hoc networks, such as QoS routing, MAC layer QoS support, and cross-layer QoS design. However, QoS solution at upper layers for real-time multimedia applications is overlooked. This paper investigates impact of the adaptation mechanisms...; Tags: QoS, Middleware, Wireless, Layer Adaptation, Middleware Adaptor; White papers 2006-02-03

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Adaptation of Scalable Media at Network Layer Using Cross-Layer Information: To build a media delivery framework that can utilize scalable media codecs for local adaptation requires intelligent adaptation functionalities. It is required to provide detailed information about the media to be forwarded not only to the application layer, but to lower layers as well. This information allows e.g. the network...; Tags: Network, Media, Adaptation, Association For Computing Machinery, Advertising & Promotion, Networking, Marketing; White papers 2006-09-20
Experimental Evaluation of Application Performance With 802.11 PHY Rate Adaptation Mechanisms in Diverse Environments: This paper examines the impact of physical layer rate adaptation mechanisms on the performance of real applications over 802.11 wireless links in diverse channel environments. The evaluations are based on a testbed with real wireless devices equipped with commodity 802.11 hardware and a hardware channel emulator. The paper considers two...; Tags: IEEE 802.11, Performance, Environment, Hardware, Adaptation Mechanism, Wireless LANs, Wi-Fi, Wireless, Performance Management, Human Resources, Workforce Management; White papers 2006-08-18
Implementing Network Management on ATM Interfaces: This paper provides a single reference on how to gather network management data on an ATM interface through the use of Simple Network Management Protocol SNMP. It focuses specifically on Cisco router ATM interfaces. ATM comprises a three-layer stack: an ATM Adaptation Layer AAL, an ATM layer, and a physical...; Tags: Network, Network Management, ATM, Network Technology, Networking; White papers 2005-10-19
Delay-Constrained Rate Adaptation for Robust Video Transmission Over Home Networks: This paper considers rate adaptation for robust transmission of high-quality video over home networks, in particular IEEE 802.11 wireless LANs. The approach includes on-line estimation of the time-varying bandwidth available at the application-/transport-layer. The paper proposes a delay-constrained rate adaptation algorithm to select an optimal bit rate, subsequently enforced by...; Tags: Georgia Institute Of Technology, Network, Home Network, Adaptation, Video, Corporate Communications, Marketing; White papers 2005-05-11

TCP Over CDMA2000 Networks: A Cross-Layer Measurement Study: Modern cellular channels in 3G networks incorporate sophisticated power control and dynamic rate adaptation which can have a significant impact on adaptive transport layer protocols, such as TCP. Though there exists studies that have evaluated the performance of TCP over such networks, they are based solely on observations at the...; Tags: Network, TCP, Springer Science+Business Media, Tcp/Ip, Networking; White papers 2007-02-09
Quality-of-Service Driven Power and Rate Adaptation for Multichannel Communications Over Wireless Links: This paper proposes a Quality-of-Service QoS driven power and rate adaptation scheme for multichannel communications systems over wireless links. In particular, the paper uses multichannel communications to model the conceptual architectures for either diversity or multiplexing systems, which play a fundamental role in physical-layer evolutions of mobile wireless networks. By...; Tags: QoS, Adaptation, IEEE, Wi-Fi, Wireless; White papers 2006-07-10
Cross-Layer Adaptation of MPEG4 Video Streaming Over Wireless Networks Using Unequal Error Protection and MC-CDMA: A novel methodology for the efficient multiplexing and streaming of MPEG4 video over wireless networks is presented and discussed. The proposed cross-layer adaptation jointly exploits Variable-BitRate VBR Multi-Carrier Code-Division Multiplexing (MC-CDM) and MPEG4 Fine-Grain-Scalability FGS in order to provide unequal error protection to the transmitted video stream. A shared bandwidth...; Tags: Bandwidth, University Of Trento, Network, MPEG-4, Wireless Network, Digital Video, Digital Media, Wireless, Personal Technology, Consumer Electronics; White papers 2005-11-01
Providing Professional Quality VoWLAN Using DECT: This paper presents a novel approach for providing professional quality telephony over WLANs. The approach is to merge the upper layers of the DECT protocol stack with the WLAN physical layer and MAC layer technology, using a protocol adaptation layer PAL. This allows retaining many of the professional quality features...; Tags: ETH Zurich, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Networking; White papers 2004-11-15
Scalability Analysis of Rate Adaptation Techniques in Congested IEEE 802.11 Networks: An ORBIT Testbed Comparative Study: Recent real-world measurements in dense congested radio environments have pointed out the inefficiency of frame error-based bit-rate adaptation mechanisms, which significantly reduce network capacity by misinterpreting frame errors due to collisions. These effects are likely to be amplified with the heavy use of media applications. Fortunately, traditional SNR-based rate adaptation,...; Tags: Technique, IEEE 802.11, New Jersey, Environment, Scalability, Collision, Adaptation, Wireless LANs, Performance Management, Wi-Fi, Wireless, Human Resources, Workforce Management; White papers 2007-04-26
TCP Performance Dynamics and Link-Layer Adaptation Based Optimization Methods for Wireless Networks: Almost a decade long research on the performance of TCP in wireless networks has resulted in many proposals and solutions to the problem of TCP throughput degradation. Several of these measures, however, have their share of drawbacks. With the continuing emergence of wireless technologies ever since the work on TCP...; Tags: Network, TCP, Wireless Network, Tcp/Ip, Networking, Wi-Fi, Wireless; White papers 2007-04-01
Advances in Wireless Video Delivery: This paper reviews practical video delivery technologies, examining existing mobile networks, commercialized or standardized transport, and coding technologies. Compression efficiency, power dissipation, and error control are intrinsic issues in wireless video delivery. Among these issues, error control technologies are evaluated at four layers: layer-1/2 transport; end-to-end transport layer such as...; Tags: Wireless Video, Video, Corporate Communications, Wireless, Marketing; White papers 2005-01-01
Link Adaptation and Cross-Layer Signaling for Wireless Video-Streaming in a Shared Medium: Changes in the quality of wireless links impose great demands on video codecs and underlying network layers when seamless video-streaming is to be achieved. Moreover, it is not enough that only the video codec or only the radio adapts to these changes; the efforts should be applied in both layers,...; Tags: Codec, Streaming Video, Video, Video Codec, Web Site Development, Web Technology, Digital Video, Corporate Communications, Wireless, Internet, Personal Technology, Marketing; White papers 2005-06-04
TCP-Aware Resource Allocation in CDMA Networks: TCP is the dominant transport protocol over both wired and wireless links. It is however, well known that TCP is not suitable for wireless networks and several solutions have been proposed to rectify this shortcoming. The work discusses in this paper explores cross-layer optimization of the rate adaptation feature of...; Tags: Aware, CDMA, TCP, Allocation, Tcp/Ip, Wi-Fi, Networking, Wireless; White papers 2006-09-26
Fast-Responsive Link Adaptation for IEEE 802.11 WLANs: This paper proposes a truly-adaptive fast-responsive link adaptation scheme for IEEE 802.11 WLANs Wireless LANs. The key idea is to direct the transmitter station's rate-increasing attempts in a controlled manner such that the responsiveness of the link adaptation scheme can be guaranteed with minimum number of rate-increasing attempts. Since the...; Tags: IEEE 802.11, Transmitter, Adaptation, Idea, Wireless LANs, Wi-Fi, Wireless; White papers 2005-09-15
DISAS: A DISelect-Based Middleware for Building Adaptive Systems: The paper presents DISAS, a middleware software that can be used to enable adaptation in existing web-based applications and legacy information systems. The proposed system provides an intermediate layer between the user and the data source that monitors system conditions, intercepts content streams, and adapts them on the fly, leveraging...; Tags: DISAS, Middleware, Java, Enterprise Software, Software, Programming Languages, Software Development, Software/Web Development; White papers 2006-05-19
Utility-Based Joint Physical-MAC Layer Optimization in OFDM: In this paper, joint physical-MAC layer optimization in OFDM systems using adaptive modulation and subcarrier allocation is investigated based on utility theory. Since utility qualifies the level of users' satisfaction derived from the radio resources they occupy, it is ideal for a network optimization metric. The paper formulates cross-layer optimization...; Tags: Optimization, Radio, Allocation, OFDM, Wireless; White papers
Joint Congestion Control and OFDMA Scheduling for Hybrid Wireline-Wireless Networks: This paper considers joint congestion control and multiuser scheduling in a hybrid wireline and wireless network, where the air interface of wireless links is based on Orthogonal Frequency Division Multiplexing OFDM. For static channels, the paper formulates this cross-layer design as a Network Utility Maximization NUM problem with both wireline...; Tags: Congestion, University Of Minnesota, OFDMA, OFDM, Wi-Fi, Wireless; White papers 2006-12-13
Fast 802.11 Link Adaptation for Real-Time Video Streaming by Cross-Layer Signaling: The quality of real-time video streaming over wireless links is significantly reduced due to packet losses and delays caused by rapid changes of the link conditions. This problem is resolved by two solutions. In the first place, a responsive MAC adaptation method is developed using SNR and packet loss statistics....; Tags: Solution, IEEE 802.11, MAC, Codec, Streaming Video, Video, Web Site Development, Web Technology, Digital Video, Corporate Communications, Wireless LANs, Wi-Fi, Wireless, Internet, Personal Technology, Marketing; White papers 2005-02-08
Peer Group-Based Dependency Management in Service-Oriented Peer-to-Peer Architectures: Dependency management in service-Oriented peer-to-Peer architectures aims at handling functional dependencies between a public service hosted by a service providing peer and all consumer peers that rely on that service. The analysis of dependencies on consumer peers is important for supporting the adaptation of a public service. The uncoordinated adaptation...; Tags: Adaptation, Dependency, Service, Peer To Peer (P2P), Internet; White papers 2005-09-30

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