Wireless systems in NGN, will integrate different network access technologies, e.g. wireless Local Area Network (WLAN), UMTS Terrestrial Radio Access Network ( UTRAN), and WiMax, Moreover, this integrated wireless system, will have to handle diverse types of traffics, such as data traffics ( e-mail, web browsing, ftp), voice traffic (VOIP), and multimedia traffics ( video conferencing, Online T...

We are living in a society of information, where the users wish more in getting, supplying, sharing and interacting through information and services anywhere, any time with any device. Then some items should be assured such as: mobility and interactivity, on an environment where the technological convergence takes place and, of course, the End-to-End QoS is assured. One of the biggest challenge...

System QoS maintenance is the activity intended to maintain the system QoS at acceptable levels. The activity consists of continuously measuring the system QoS characteristics and adjusting the system parameters that affect them. This paper introduces a model-driven approach to the maintenance of QoS characteristics in heterogeneous networks that support geographically distributed processing se...

Internet service providers usually express the quality of network services through a set of values determined according to several network performance parameters periodically collected or measured. However, for common end-users, these values do not give an overall idea of the quality of the network services as they stand for different units and evaluate different perspectives of each service qu...

In this paper, an IEEE 802.15.6 wireless body area networks (WBAN) medium access control protocol is developed to support a wireless USB (WUSB) application as a protocol adaptation layer (PAL). However, current WBAN protocol still does not have well-defined QoS mapping and resource allocation mechanisms to support multimedia streams with requested QoS parameters. To solve this problem, we propo...

quality of service (qos) refers to a set of rules or techniques that help the network administrators use the available network resources optimally to manage the effects of congestion and to treat the applications according to their needs. the differentiated services architecture (diffserv) allows providing quality of service to users. the major diffserv premise is that individual flows with sim...

In this paper we describe the design of a QoS driven communications stack in a microkernel operating system environment. The paper focuses on resource management aspects of the design and in particular we deal with CPU scheduling, network resource management and memory management issues. We describe an API at which QoS parameters are supplied by users and present an architecture able to guarant...

Most of the centralized QoS mechanisms for WLAN MAC layer are only able to guarantee QoS parameters for CBR video traffic effectively. On the other hand, the existing distributed QoS mechanisms are only able to differentiate between various traffic streams without being able to guarantee QoS. This paper addresses these deficiencies by proposing a new distributed QoS scheme that guarantees QoS p...

Wireless Local Area Networks (WLANs) are one of the fastest growing wireless access technologies. The IEEE 802.11 Standard doesn’t support any QoS mechanisms. IEEE 802.11 MAC layer supports two basic access mechanisms, DCF (Distributed Coordination Function) and PCF (Point Coordination Function). The EDCA mechanism of the IEEE 802.11e standard provides QoS support through service differentiatio...

In this study, we discuss some technical QoS parameters with definitions. Relative merits and demerits of the same are compared as well in view of their effectiveness in different cellular scenarios. Finally, the behavior of those QoS parameters are interpreted in the context of various channel allocation schemes.