Research of Quality of Service (QoS) in Telecommunication Networks with Packet Switching

2007 ◽  
Author(s):  
Roman Burachok ◽  
Myhaylo Klymash ◽  
Hanna Laba
Keyword(s):  
Quality Of Service ◽  
Packet Switching ◽  
Telecommunication Networks

scholarly journals Dynamic Wavelength Grouping for Quality of Service in Optical Packet Switching

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Hafsa Bibi ◽  
Farrukh Zeeshan Khan ◽  
Muneer Ahmad ◽  
Anum Naseem ◽  
Tomasz Holynski ◽  
...  
Keyword(s):  
Quality Of Service ◽  
Packet Switching ◽  
Optical Packet Switching

scholarly journals Analisa Perbandingan Quality of Service Voice Over IP dengan Pengujian Codec Menggunakan Algoritma Low Latency Queuing

2017 ◽  
Vol 3 (2) ◽  
pp. 249-254
Author(s):  
Darmawan Darmawan ◽  
Yayan Syafriyatno
Keyword(s):  
Quality Of Service ◽  
Packet Loss ◽  
Packet Switching ◽  
Voice Over Ip ◽  
Low Latency ◽  
Delay Jitter

Voice over IP (VoIP) adalah solusi komunikasi suara yang murah karena menggunakan jaringan IP dibanding penggunaan telephone analog yang banyak memakan biaya. Dalam penerapannya, VoIP mengalami permasalahan karena menggunakan teknologi packet switching yang mana penggunaannya bersamaan dengan paket data sehingga timbul delay, jitter, dan packet loss.  Pada penelitian ini, algoritma Low Latency Queuing (LLQ) diterapkan pada router cisco. Algoritma LLQ merupakan gabungan dari algoritma Priority Queuing (PQ) dan Class Based Weight Fair Queuing (CBWFQ) sehingga dapat memprioritaskan paket suara disamping paket data. Algoritma LLQ ini diujikan menggunakan codec GSM FR, G722, dan G711 A-law. Hasil pengujian didapatkan nilai parameter yang tidak jauh berbeda dan memenuhi standar ITU-T.G1010. Nilai delay rata - rata terendah yaitu ketika menggunakan codec G722 sebesar 20,019 ms tetapi G722 memiliki rata - rata jitter yang terbesar yaitu 0,986 ms.  Codec dengan jitter rata – rata terkecil adalah G711 A-law sebesar 0,838 ms. Packet loss untuk semua codec yang diujikan adalah 0%.  Throughput pada paket data terbesar saat menggunakan codec GSM FR yaitu 18,139 kbps. Codec yang direkomendasikan adalah G711 A-law karena lebih stabil dari segi jitter dan codec GSM FR cocok diimplementasikan pada jaringan yang memiliki bandwitdh kecil.

scholarly journals Customer-Oriented Quality of Service Management Method for the Future Intent-Based Networking

2020 ◽  
Vol 10 (22) ◽  
pp. 8223
Author(s):  
Mykola Beshley ◽  
Peter Veselý ◽  
Andrii Pryslupskyi ◽  
Halyna Beshley ◽  
Marian Kyryk ◽  
...  
Keyword(s):  
Quality Of Service ◽  
Quality Management ◽  
Service Quality ◽  
Quality Of Experience ◽  
Service Management ◽  
Customer Experience ◽  
Telecommunication Networks ◽  
Service Quality Management ◽  
Management Method

The rapid development and spread of communication technologies is now becoming a global information revolution. Customers have a need for communication services, which could be flexibly configured in accordance with their Quality of Experience (QoE) requirements. Realizing the close connection between customer experience and profitability, the service provider has been placing more and more attention on customer experience and QoE. The traditional quality of service management method based on SLA (Service Level Agreement) is not sufficient as a means to provide QoE-related contracts between service providers and customers. The current SLA method is mostly limited and focused on technical aspects of QoS (Quality of Service). Furthermore, they do not follow on the network the principles and semantic approach to the QoS specification for a communication service using QoE parameters. In this paper, we propose a customer-oriented quality of service management method for future IBN (Intent-Based Networking). It is based on a new QoE metric on a scale from 1 to 5, which allows one to take into account the commercial value of e-services for customers. Based on this approach, the network configuration and functionality of network equipment automatically changes depending on customer requirements. To implement the new method of service quality management, an algorithm for routing data packets in the network was developed, taking into account the current load of the forecast path. The algorithm of billing system functioning in conditions of customer-oriented quality management in telecommunication networks has been created. To investigate the effectiveness of the proposed method of service quality management with the traditional SLA method, we developed a simulation network model with the implementation of two approaches. By conducting a simulation, it was determined that the proposed method gives an average gain of 2–5 times for the criterion of the number of customers who require high quality of experience of the service.

Multilayered Quality of Service

2002 ◽  
pp. 106-122
Author(s):  
Luiz A. DaSilva
Keyword(s):  
Quality Of Service ◽  
Real Time ◽  
Packet Switching ◽  
High Efficiency ◽  
Heterogeneous Traffic ◽  
Statistical Multiplexing ◽  
Best Effort ◽  
Switched Networks ◽  
Treat All

Today’s networks support applications that deliver text, audio, images and video, often in real time and with a high degree of interactivity, using a common infrastructure. More often than not, traffic is carried over packet-switched networks that treat all data the same, under what is known as best-effort service. Packet switching can achieve very high efficiency through statistical multiplexing of data from numerous sources; however, due to the very nature of packet switching, one should expect fluctuations in throughput, delay, reliability, etc., for any given flow. The greater the statistical multiplexing capabilities, the greater the efficiency and also the greater the variability of achieved performance; in this sense, best-effort service provides maximum efficiency with highly unpredictable service quality. Clearly, not all traffic flows are created equal. Interactive web-based applications tend to be very sensitive to throughput, while real-time voice and video are sensitive to delay and jitter, and traditional data applications such as e-mail and file transfers are fairly insensitive to fluctuations in performance. The concept of quality of service (QoS) has evolved from the realization that in networks that carry heterogeneous traffic it makes sense to treat specific classes of traffic according to their specific needs.

scholarly journals Evaluating Psychoacoustic Parameters and Quality of Transmitted Speech Over Wireless Networks

2019 ◽  
Vol 4 (2) ◽  
pp. 1-6
Author(s):  
A. Olatubosun ◽  
Patrick Olaniyi Olabisi
Keyword(s):  
Wireless Networks ◽  
Quality Of Service ◽  
Quality Factor ◽  
Telecommunication Networks ◽  
Perceptual Quality ◽  
Loudness Level ◽  
Original Speech ◽  
Loudness Model ◽  
Psychoacoustic Parameter

Psychoacoustic parameter of sound known as loudness is a major quality factor for assessing the perceptual quality of service of speech signals transmitted through telecommunication networks. The Zwicker and Fastl loudness model is a preferred loudness model and in this work has been programmed to obtain both loudness and loudness level of speeches transmitted over wireless. Here,the best maximum instantaneous loudness of the transmitted speeches is 42.55% of that of the original speech. While the best maximum instantaneous loudness level of the transmitted speeches is 87.06% of that of the original speech. These showed an intuitive and innovative representation of the degradation suffered by the transmitted speeches with respect to the original speech.

scholarly journals Νέες μέθοδοι για τον έλεγχο προσπέλασης σε δίκτυα ευρείας ζώνης

2002 ◽  
Author(s):  
Ελένη-Αικατερίνη Λελίγκου
Keyword(s):  
Quality Of Service ◽  
Wavelength Division Multiplexing ◽  
Service Differentiation ◽  
Telecommunication Networks ◽  
Large Set ◽  
Functional Requirements ◽  
Implementation Cost ◽  
Time Service ◽  
New Methods

The information volume and the application variety is constantly increasing imposing new demands on the telecommunication networks. The emerging technologies intend to offer new broadband services to the end users, extending the access opportunities in wider areas and broader user groups. The next step includes the development of new methods to control access that will maximize the utilization providing at the same time service differentiation, efficient switching techniques and new systems to cover the new functional requirements. The demand for Quality of Service becomes imperative nowadays with the multi-media services spreading around. The solution is pursued in the study, development and implementation of new dynamic and flexible mechanisms embedded in every networking component. Addressing this need, the dissertation investigates access mechanisms for three different systems and focuses on the service strategy and the design of the controller, which is responsible for allocating the resources satisfying a set of requirements. The first system dealt with is this of a Hybrid Fiber Co-axial network of tree-topology, where the Medium Access Controller is allocating the upstream channel slots. The MAC controller governs this distributed queuing system collecting requests from the modems and issuing transmission permits. The dissertation presents an innovative algorithm, which is aligned with the Differentiated Services architecture, to efficiently allocate the resources and provide different Quality of Service levels. The connections are grouped/aggregated in four different classes with different Quality of Service guarantees and are dynamically serviced on request basis. The implementation cost is assessed while the performance evaluation is based on results of a large set of tests that were carried out on the corresponding laboratory demonstrator system using either traffic generators boards or real applications to inject traffic in the system. A wavelength division multiplexing (WDM) ring covering metropolitan areas is the second system that is referenced. Every node attached to this ring is allowed to transmit in slots of fixed duration in multiple wavelengths at 10Gbps. A dynamic access algorithm based on the empty slot protocol is proposed to offer service differentiation. The execution of the algorithm is performed in a distributed way and is based on the information circulating in one wavelength, which carries control information. The basic scheme is this of the class reservation instead of individual node reservation. The functional requirements are analyzed while the implementation architecture is presented to certificate that the algorithm is executable in less than a slot time (1 μs) and with very little hardware resources, while backing different node’s configurations in terms of number of tunable and fixed transceivers. Finally, the access to the processing engines and to the output path of a protocol processor implemented as system on a chip is addressed. The dissertation proposes a scheme for the task and the traffic schedulers which employs flow classification and aggregation in scheduling queues and allows them to operate on the same structures -eliminating the cost- while satisfying the very different requirements imposed on them. The main result is the design of a task scheduler that supports processing throughput of 2,5Gbps and capable of implementing different service algorithms and, on the other hand, the design of a traffic scheduler which performs peak rate shaping for the transmission of both fixed size packets (e.g. ATM cells) or variable length packets (as in the case of IP networks). The implementation requirements and cost are also analyzed. The dissertation presents new methods to control access in different systems, which prove to be efficient and flexible while their implementation cost and performance is analyzed. The target has in all systems be the maximization of the utilization and the service differentiation, while their impact on the system scalability is also presented.

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