QoS Architecture of WiMAX

2010 ◽  
pp. 42-56
Author(s):  
Rath Vannithamby ◽  
Muthaiah Venkatachalam
Keyword(s):  
Access Network ◽  
Radio Link ◽  
The Novel ◽  
Qos Provisioning ◽  
Broadband Wireless ◽  
Traffic Demand ◽  
Air Interface ◽  
Wireless Access Network ◽  
End To End

WiMAX technology, based on the IEEE 802.16 standard, is a promising broadband wireless technology for the upcoming 4G network. WiMAX has excellent QoS mechanisms to enable differentiated Quality of service of various applications. QoS in broadband wireless access network such as WiMAX is a difficult and complicated task, as it adds unpredictable radio link, user and traffic demand. WiMAX supports end-to-end QoS provisioning to allow various applications and services. This chapter aims to provide a detailed overview of the QoS in WiMAX, the current and the future. Various air-interface and network mechanisms that enable the end-to-end QoS provisioning are then discussed. Finally, the novel mechanisms to improve the QoS provisioning in the next generation WiMAX system are also discussed.

Multicommodity-Based Delay Analysis for Heterogeneous Wireless Services in Core Network

2012 ◽  
Vol 198-199 ◽  
pp. 1733-1738
Author(s):  
Xiao Wei Qin ◽  
Feng Chen
Keyword(s):  
Access Network ◽  
Core Network ◽  
Wireless Applications ◽  
Core Networks ◽  
Service Delay ◽  
Wireless Access Network ◽  
The Cost ◽  
Mathematics Problem ◽  
Minimal Cost Flow

With the explosive growth of wireless applications, the subscribers’ requirements of QoS (Quality of Service) are increasing as well. In this paper, the upper bound of the tolerant delay of services in wireless access network is investigated, by mapping core network onto a cost-variable directed graph, where the cost is construed as the average service delay of the flows traveling in core network that depends on the current load. A multicommodity minimal cost flow mathematics problem is then derived and solved by Price-directive Decomposition and Lagrangian Relaxation. Simulations are carried out in two typical core networks and some valuable conclusions are gained.

scholarly journals Optical Transport Network to support Digital Communications

2021 ◽  
Vol 12 (4) ◽  
pp. 1418-1433
Author(s):  
Marco Rosario Villareal, Et. al.
Keyword(s):  
Access Network ◽  
Data Communication ◽  
Transport Network ◽  
Telecommunication Services ◽  
Optical Transport Network ◽  
Optimum Speed ◽  
Wireless Access Network ◽  
Adequate Quality ◽  
Optical Transport

The objective of this work is to propose a solution to the problem of the lack of telecommunication services, with adequate quality of service and coverage, in the town of Choclococha, Huancavelica-Peru. For this purpose, the design and evaluation of an optical link as a backbone network and a wireless access network is presented. It is an applied and experimental research in which performance parameters were evaluated. The independent variable is the optical transport network and the dependent variable is data communication. The latter is defined by two indicators: throughput and signal reception power at the users. Both indicators were measured in a sample of the population, obtaining results that were validated with respect to the expected values according to specifications and regulations. Thus, the measured throughput exceeds the 40% data rate guaranteed by the telecommunications operator. As for the reception power, it exceeds the sensitivity level of the receiving equipment. Therefore, it is concluded that the proposed solution supports communications with optimum speed and coverage.

Quality of Service (QoS) Routing in Mobile Ad Hoc Networks

2010 ◽  
pp. 464-496
Author(s):  
R. Asokan ◽  
A. M. Natarajan
Keyword(s):  
Quality Of Service ◽  
Ad Hoc ◽  
Qos Routing ◽  
Qos Provisioning ◽  
Mobile Nodes ◽  
Delay Jitter ◽  
End To End Delay ◽  
Mobile Ad Hoc ◽  
End To End

A Mobile Ad hoc NETwork (MANET) consists of a collection of mobile nodes. They communicate in a multi-hop way without a formal infrastructure. Owing to the uniqueness such as easy deployment and self-organizing ability, MANET has shown great potential in several civil and military applications. As MANETs are gaining popularity day-by-day, new developments in the area of real time and multimedia applications are increasing as well. Such applications require Quality of Service (QoS) evolving with respect to bandwidth, end-to-end delay, jitter, energy etc. Consequently, it becomes necessary for MANETs to have an efficient routing and a QoS mechanism to support new applications. QoS provisioning for MANET can be achieved over different layers, starting from the physical layer up to the application layer. This chapter mainly concentrates on the problem of QoS provisioning in the perception of network layer. QoS routing aims at finding a feasible path, which satisfies QoS considering bandwidth, end-to-end delay, jitter, energy etc. This chapter provides a detailed survey of major contributions in QoS routing in MANETs. A few proposals on the QoS routing using optimization techniques and inter-layer approaches have also been addressed. Finally, it concludes with a discussion on the future directions and challenges in QoS routing support in MANETs.

Quality of Service Issues in Micro Mobility Enabled Wireless Access Networks

2010 ◽  
pp. 238-256
Author(s):  
A. Dev Pragad ◽  
Vasilis Friderikos ◽  
A. Hamid Aghvami
Keyword(s):  
Quality Of Service ◽  
Mobile Networks ◽  
Mobility Management ◽  
Access Network ◽  
Wireless Access ◽  
Wireless Access Networks ◽  
Handover Delay ◽  
Wireless Access Network ◽  
Micro Mobility

Provision of Quality of Service (QoS) and Micro Mobility management is imperative to delivering content seamlessly and efficiently to the next generation of IP based mobile networks. Micro mobility management ensures that during handover the disruption caused to the live sessions are kept to a minimum. On the other hand, QoS mechanisms ensure that during a session the required level of service is maintained. Though many micro mobility and QoS mechanisms have been proposed to solve their respective aspects of network operation, they often have interaction with each other and can lead towards network performance degradation. This chapter focuses specifically on the issues of interaction between micro mobility and QoS mechanisms. Special focus is given to the relatively unexplored area of the impact Mobility Agents can have on the wireless access network. Mobility Agents play a central role in providing micro mobility support. However, their presence (location and number) can affect the routing as well as the handover delay. Through an example network this issue is highlighted. Following which an optimization framework is proposed to deploy Mobility Agents optimally within a micro mobility enabled wireless access network to minimise both the routing overhead as well as the handover delay. Results show considerable improvements in comparison to deploying the Mobility Agents arbitrarily.

Analysis of VoIP Traffic over the IEEE 802.16 Protocol

2014 ◽  
pp. 239-259
Author(s):  
Luis Ortiz ◽  
Victor Rangel ◽  
Javier Gomez ◽  
Miguel Lopez-Guerrero
Keyword(s):  
Theoretical Model ◽  
Access Network ◽  
Ieee 802.16 ◽  
Access Networks ◽  
Mobile Systems ◽  
Wireless Access ◽  
The Internet ◽  
Broadband Wireless ◽  
Wireless Access Network ◽  
Radio Resources

Voice over Internet Protocol (VoIP) is one of the fastest growing applications for the Internet today and is a very important service because mobile users can utilize voice services more cheaply compared with most mobile systems. A crucial application over these networks is VoIP over the Worldwide Interoperability for Microwave Access (WiMAX), which is one of the technologies in Broadband Access Networks based on IEEE 802.16 standards. It provides high throughput broadband connections over long distances, which supports Point to Multi-Point (PMP) wireless access. A hurdle, however, is the number of voice connections that can be supported. Since VoIP requires short end-to-end delays, supporting as many VoIP users as possible in a mobile broadband wireless access network, considering limited radio resources, becomes a very important issue. In this chapter, the authors use a theoretical model and an algorithm to evaluate the performance of some of the most important VoIP codecs.

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