Introduction to VoIP

Swale, R. P.

doi:10.1049/pbbt003e_ch1

Cited by 2 publications

(7 citation statements)

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“…Three models have been developed to provide a range of QoS in IP transport network. These are First in First out (FIFO) and two other models defined by the Internet Engineering Task Force (IETF), which are Integrated Service (IntServ), and Differentiated Services (DiffServ) [9], [10] i.…”

Section: E Ip Transport Differentiated Quality Of Services Conceptmentioning

confidence: 99%

“…IntServ architecture has been developed to extend and overcome the limitation of the existing IP architectural model (FIFO) to support both realtime and best-effort traffic flows. The key feature is to provide some control over the end-to-end packet delays in order to meet the real-time QoS [9], [10].…”

Section: First In First Out (Fifo)mentioning

confidence: 99%

“… Forwarding will be according to "Per-Hop-Behavior" or PHB specified for the particular packet class; such PHB is strictly based on class marking (no other header fields can be used to influence PHB).The DiffServ model also introduced two types of forwarding classes: Expedited Forwarding (EF) PHB and Assured Forwarding (AF) PHB [9], [10].…”

Section: First In First Out (Fifo)mentioning

confidence: 99%

“…Assured Forwarding (AF): behavior allows the operator to provide assurance of delivery as long as the traffic does not exceed some subscribed rate. Traffic that exceeds the subscription rate faces a higher probability of being dropped if congestion occurs [9], [10], [11].…”

Section: First In First Out (Fifo)mentioning

confidence: 99%

“…Therefore, each flow or each aggregated flow is handled selectively. Packet classification can be recognized based on many factors including DSCP, IP precedence, Source address and Destination address [9], [10].…”

Section: F Ip Services Componentsmentioning

confidence: 99%

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Improving QoS for Real-time Traffic using Multiple Low Latency Queueing Scheduling Mechanisms

Yousif¹,

Abdelrahman²,

Abbas³

2022

kuej

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In this work, a Multiple Low Latency Queuing scheduling mechanism model is developed to improve the QoS performance for real time and critical mission data traffic in LTE mobile networks. The main objective of this model is to achieve minimum delay and improve the QoS for real time applications (like Live Video and Voice over LTE). In addition, issues likestarvation of lower priority queues and bandwidth allocation are addressed. The model is composed of four components, first, classifier to classify the incoming traffic in router interface. Second, four Class Based Weighted Fair Queues (CBWFQ) scheduling mechanisms, with activation of strict priority feature in the first two queues. Third, two separate rate limiters (policers), one for each strict priority queue. Two scenarios are designed and simulated using Optimized Network Engineering Tool (OPNET). The results show that, in the case of Multiple Low Latency Queuing scheduling mechanism model, the real time traffic suffers less delay compared to the case of existing scheduling mechanisms like (Custom Queuing, Priory Queuing, CBWFQ and Low Latency Queuing). On the other hand, the model also addressed the starvation of lower-priority queuesproblem.

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Section: E Ip Transport Differentiated Quality Of Services Conceptmentioning

confidence: 99%

Section: First In First Out (Fifo)mentioning

confidence: 99%

Section: First In First Out (Fifo)mentioning

confidence: 99%

Section: First In First Out (Fifo)mentioning

confidence: 99%

Section: F Ip Services Componentsmentioning

confidence: 99%

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Improving QoS for Real-time Traffic using Multiple Low Latency Queueing Scheduling Mechanisms

Yousif¹,

Abdelrahman²,

Abbas³

2022

kuej

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Modeling and Evaluating NFV-Enabled Network Services under Different Availability Modes

Tola

Nencioni

Helvik

et al. 2019

2019 15th International Conference on the Design of Reliable Communication Networks (DRCN)

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Network and Telecom operators are continuously embracing the adoption of Network Function Virtualization (NFV) as a means to provide more agile, flexible and costefficient services. Many telecommunication services need to possess carrier-grade quality of service; therefore, future NFVenabled telecom services should present high levels of availability. In this paper, we present a composed availability model of NFV-enabled network services under different availability modes, namely Standard Availability, Cold Protection, and Hot Protection. We model and analyze the availability of NFV-enabled network services for each of the availability modes aiming at finding the best redundancy configuration to ensure carrier-grade quality. Through discrete-event simulation analysis we are able to identify the most suitable redundancy configuration for each of the availability modes.

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Introduction to VoIP

Cited by 2 publications

References 0 publications

Improving QoS for Real-time Traffic using Multiple Low Latency Queueing Scheduling Mechanisms

Improving QoS for Real-time Traffic using Multiple Low Latency Queueing Scheduling Mechanisms

Modeling and Evaluating NFV-Enabled Network Services under Different Availability Modes

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