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802.11e HCCA (Hybrid coordination function Controlled Channel Access) exhibits good QoS provisioning for constant bit rate (CBR) video streams in a single collision domain. However, its performance degrades significantly for variable bit rate (VBR) video streams particularly in multi-collision domains. In addition, HCCA has the disadvantage of high complexity. In this paper, we introduce a deterministic...
One of the key targets for LTE/SAE is 100 Mbps peak data rate in downlink. While compared to the lined data rate, the wireless data rate is still a bottleneck. This means if there is no flow control in aGW; packets will be buffered in eNB. While the buffer in eNB is limited, packets may be dropped. To reduce the harm to the performance of the TCP based application from packet loss, flow control is...
Real-time streaming over wireless networks is a challenging proposition due to the highly variable nature of wireless links and the resource-poor nature of mobile device. In such a context, transmission control schemes have to dynamically adapt both to the application requirements and to the channel conditions. In this paper, we propose an adaptive cross-layer quality-of-service (QoS) scheme for wireless...
The efficient scheduling is crucial to QoS (quality of service) provisioning for multimedia flows. In this paper, we study on the scheduling algorithms for mobile WiMAX (worldwide interoperability for microwave access) based on IEEE 802.16e. Considering the states of queues, the channel conditions and the QoS requirements of service classes, we propose a cross-layer designed scheduling algorithm called...
This paper details the design, implementation, simulation, and testing of the Smart Radio Channel Change Protocol (CCP), a primary user avoidance technique for dynamic spectrum sharing cognitive radios in wireless communication networks. The CCP enables a digital cognitive radio to detect the presence of legacy analog or digital radios, and to facilitate channel-change procedures to use an alternate,...
This work considers the transmission of multimedia streams over broadband networks using the latest video coding standard H.264/SVC. The scalable video coding for heterogeneous media delivery allows temporal, spatial and SNR scalability in video flows, adapting and optimizing the quality of the received media according to the wireless channel conditions. In this paper an evaluation platform combining...
Wireless local area networks (WLANs) are increasingly popular because of their flexibility. This spreading of WLANs comes with an increasing use of multimedia applications. Such applications are bandwidth sensitive and require a quality of service (QoS) that guarantees high performance transmission of continuous data. This requirement is the focus of the new enhanced IEEE 802.11e standard protocol...
The emerging broadband wireless access (BWA) technology based on IEEE 802.16 is one of the most promising solutions to provide ubiquitous wireless access to the broadband service at low cost. This paper proposes an efficient uplink bandwidth request-allocation algorithm for variable-rate realtime services in IEEE 802.16 BWA networks. In order to minimize bandwidth wastage without degrading quality...
The fundamental medium access control mechanism in IEEE 802.11 wireless LANs (WLANs)-distributed coordination function (DCF) only supports the best-effort service and does not support quality-of-service (QoS) differentiation. Enhanced distributed channel access (EDCA) in IEEE 802.11e supports delay differentiation. A new approach, EDCA+ , is proposed to enhance QoS over WLANs. It simultaneously achieves...
We propose a fast and efficient end-to-end QoS measurement scheme. It collects distributed QoS information which is autonomously measured at each network segment in the backbone networks, and estimates the end-to-end QoS parameters from the collected data. It does not require sending the probe packets and statistical analysis for some duration, the proposed method provides the end-to-end QoS information...
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