In wireless network, real time flows are prioritized over non-real time flows. Because of this prioritization, non-real time flows endures starvation. Furthermore, real time flows are handled quite generally as no specification is given to emergency flows. To consider all these difficulties, we propose a service differentiated call admission control mechanism for next generation wireless networ...

This paper proposes a new advanced Call Admission Control (CAC) strategy involving for the first time, a bandwidth reservation scheme that is influenced by the direction attribute of a mobile terminal (MT). Aside from the Quality-of-Service (QoS) parameters, the direction attribute plays a key role in efficiently reserving resources for MTs supporting multimedia communications for different QoS...

VBR compressed video is known to exhibit significant, multiple-time-scale rate variability. A number of researchers have considered transmitting stored video from a server to a client using smoothing algorithms to reduce this rate variability. These algorithms exploit client buffering capabilities and determine a “smooth” rate transmission schedule, while ensuring that a client buffer neither o...

Call Admission Control (CAC) policies in mobile cellular wireless networks give priority to handoff requests over new call requests. In the guard channel policy, an integer number of channels are reserved for handoff calls, while the fractional guard channel policy rejects new calls with a probability that varies with the current channel occupancy. The effect of reservations on new and handoff ...

La gestion des ressources radio (GRD) joue un rôle majeur dans la fourniture de Qualité de service (QS) pour les systèmes de communication sans fil. La performation des techniques de GRD a un impact direct sur la performance de chaque usager et celle du réseau globalement. Les appels entrants (nouveaux ou transferts intercellulaires) voient leur accès au réseau accordé/refusé par le processus d...

Given a network together with a set of connection requests, call admission control is the problem of deciding which calls to accept and which ones to reject in order to maximize the total profit of the accepted requests. We consider call admission control problems with advance reservations in star networks. For the most general variant we present a constant-factor approximation algorithm resolv...

Conventional call admission control (CAC) methods generally accept (or reject) new call arrivals on the basis of measured information such as the signal-to-interference ratio (SIR) or the total received power in the individual cells. However, this paper proposes a novel approach which combines the CAC and power control mechanisms and operates in a centralized control manner. The essence of the ...

Call admission control (CAC) plays a significant role in providing the desired quality of service in wireless networks. Many CAC schemes have been proposed. Analytical results for some performance metrics such as call blocking probabilities are obtained under some specific assumptions. It is observed, however, that due to the mobility, some assumptions may not be valid, which is the case when t...

Analysis of Joint Call Admission Control Strategies for Heterogeneous Cellular Networks Olabisi Falowo (University of Cape Town, South Africa); H. Anthony Chan (University of Cape Town, South Africa); “This paper investigates three joint call admission control algorithms (JCAC) for heterogeneous cellular networks. These algorithms are random-selectionbased, service-based, and load-based JCAC al...

As universal mobile telecommunications system (UMTS) and wireless local area network (WLAN) have complementary characteristics, convergence of UMTS and WLAN offer seamless wireless access service to users. In a converged UMTS/WLAN enhancing quality of service (QoS) for different services require call admission control and load balancing. This paper analyses the performance of wideband power bas...