What is Quality of Service

The United Nations Consultative Committee for International Telephony and Telegraphy (CCITT) Recommendation E.800, has defined QoS as: “The collective effect of service performance which determines the degree of satisfaction of a user of the service”. This is a widely accepted definition. But in the VANET context, QoS refers to different notions at different networking layers. At the physical layer, QoS refers to the data rate and packet loss on the wireless links, which is a function of the channel quality. At the MAC layer, QoS is related to the fraction of time, a node is able to successfully access and transmit a packet. At the routing layer, end-to-end QoS metrics would depend on the metrics at each hop of a multi-hop route. The routing layer must try to compute and maintain routes that satisfy the QoS requirement for the lifetime of a connection. Learn more in: An Adaptive Fuzzy-Based Service-Oriented Approach with QoS Support for Vehicular Ad Hoc Networks

The measurement of the network characteristics seen by a user by using quantitative measures. Learn more in: Studying Quality of Experience (QoE) over Wireless Networks

Designs the achievable performances that a system, an application or a service is expected to deliver to its consumers. Learn more in: Pervasive Grids: Challenges and Opportunities

The ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow. Learn more in: Grid Analysis of Radiological Data

The evaluation of the performance of the service perceived or measured by the clients. Learn more in: Quality of Service of Data Broadcasting Algorithms on Erroneous Wireless Channels

The range or agreed boundaries within which the overall output performance that is delivered to the end user has to remain in order that minimum requirements for satisfactory service are maintained in the consumer environment. Learn more in: Quality of Service Monitoring Strategies in Service Oriented Architecture Environments using Processor Hardware Performance Metrics

This is a measure of network performance that reflects the network's transmission quality and service availability. QoS can come in the form of traffic policy in which the transmission rates are limited which guarantees a certain amount of bandwidth will be available to applications. Learn more in: The Internet of Things

Ability to offer greater quality assurance for applications in a specific area of work. Learn more in: WSARCH: A Service-Oriented Architecture with QoS

The overall performance of a telephony or computer network. Learn more in: Advances in QoS/E Characterization and Prediction for Next Generation Mobile Communication Systems

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It is defined as the measurement of the overall performance/throughput of network system. Learn more in: Self-Managed System for Distributed Wireless Sensor Networks: A Review

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Providing cloud services to the clients without violating the conditions provided in the SLA document. Learn more in: Energy Management in Cloud Computing

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The optimal design of networks for telemedicine should meet technical aspects such as transmission bandwidth, delay, jitter, data loss, and so forth (quality of service). Learn more in: VEMH: Virtual Euro-Mediterranean Hospital for Evidence-Based Medicine in The Euro-Mediterranean Region

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Concerns with the ability of a network to provide a data transmission service according to the client requirements. Learn more in: Quality of Service and Radio Management in Biomedical Wireless Sensor Networks

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An objective characterisation of the performance levels delivered to users by a system or service. Ideally, a system should maintain QoS at or above some minimum level. Learn more in: Low-Overhead Development of Scalable Resource-Efficient Software Systems

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It is a generic term referring to the level of quality of a certain service. QoS definition depends on the specific service quality parameters (e.g., jitter, delay, errors). Learn more in: Exploiting P2P Solutions in Telecommunication Service Delivery Platforms

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The collective effect of service performance which determines the degree of satisfaction of a user of the service Learn more in: Performance Evaluation of Quality of Service in IEEE 802.15.4-Based Wireless Sensor Networks

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A set of characteristics of a networking service that can be interpreted as representatives of its quality. Learn more in: Research Challenges in Multimedia WiMAX

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Refers to the capability of a system to provide services to customers within the expected limits of user preference. Learn more in: Virtualization as the Enabling Technology of Cloud Computing

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A measure of network performance that reflects the network's transmission quality and service availability. QoS can come in the form of traffic policy in which the transmission rates are limited which guarantees a certain amount of bandwidth will be available to applications. Learn more in: Software Piracy

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It can provide different priority to different users or data flows, or guarantee a certain level of performance to a data flow in accordance with requests from the application program or the Internet service provider policy. Learn more in: Adaptive Retransmission Scheme for Video Streaming Applications

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The ability to provide specific guarantees to traffic flows regarding the network characteristics, such as packet loss, delay, and jitter experienced by the flows. Learn more in: Mobile Ad Hoc Networks (MANETs) for Multimedia Transmission

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The overall description of the performance of a cloud service. Learn more in: A Collaborative Ranking Approach for Discovery and Selection of Cloud Services

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The perceived quality level of the structure that learner has about the involved technical components within technology-supported learning environments. Learn more in: An Exploratory Analysis of the Role of Emotions in E-Learning

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