Quality of Service
The interpretation and definition of service quality and its classes is first presented. While there are four classes of service in Fixed WiMAX (unsolicited granted service, real-time polling service, non-real-time polling service and best effort) in Mobi
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Quality of Service Ramjee Prasad and Fernando J. Velez
Abstract The interpretation and definition of service quality and its classes is first presented. While there are four classes of service in Fixed WiMAX (unsolicited granted service, real-time polling service, non-real-time polling service and best effort) in Mobile WiMAX there is an extra class: extend real-time polling service. The Quality of Service (QoS) architecture is presented for the point-to-multipoint (PtM) mode. Packets originated at the SS are classified by the connection classifier based on the connection ID (CID) and are forwarded to the appropriate queue for the communication with the BS. The discussion of details on the architecture includes aspects of UL and DL scheduling. QoS provisioning and the object model for service quality are also discussed. Finally, the authorization module is addressed as well as service flow types and creation.
4.1
Introduction
Quality of Service (QoS) refers to the ability of the network to provide better service to selected network traffic over various technologies. The goal of QoS technologies is to provide priority that is required by some real-time and interactive traffic, while making sure that the traffic on the other paths does not fail. Compared with existing high-speed Internet services, new broadband services, such as interactive television and multimedia telephony, demand different user expectations, such as high service availability, flicker free video quality and smooth voice communication. In order to ensure such a user- centric broadband experience
R. Prasad (*) Center for TeleInFrastruktur (CTIF), Aalborg University, Niels Jernes Vej 12, DK–9220 Aalborg Øst, Denmark e-mail: [email protected]
R. Prasad and F.J. Velez, WiMAX Networks, DOI 10.1007/978-90-481-8752-2_4, # Springer ScienceþBusiness Media B.V. 2010
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becomes a reality, the broadband wireless access networks must meet a number of Quality of Service (QoS) requirements, including guaranteed throughput, and low delay, jitter and packet loss, for such new services in demand. Today in broadband wireless access (BWA) the perception is that as adoption grows, so does the need for guaranteeing QoS. The issue of QoS, therefore, has become a critical area of concern for suppliers of broadband wireless access equipment and their customers. Enforceable QoS is an essential foundation for widespread acceptance of broadband wireless, since it allows for more efficient sharing of the operator’s infrastructure, as demand for capacity increases with subscriber take-up. The recent explosive growth of the Internet has given rise to demands for higher capacity, higher data rate, and more advanced multimedia services to residential and small business customers. The IEEE 802.16 standard is designed to support these demands and specifies the WirelessMAN air interface [1, 2]. IEEE 802.16 can support multiple communication services (data, voice, video) with different QoS requirements. IEEE 802.16 Media Access Control (MAC), wh
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