Dropping probability of handoff calls and blocking probability of new calls are two important QoS measures for cellular networks. Call admission policies, such as fractional guard channel and uniform fractional guard channel policies are used to maintain the pre-specified level of QoS. Since the parameters of network traffics are unknown and time varying, the optimal number of guard channels is...

Abstrcrct-When designing the call admission control algorithm for multi-traffic mobile communication system, two priorities must be taken into account: one is the priority between the traffics; other is the priority for handoff call. I n this paper, an analytical model, a two-dimension Markov chain is proposed to investigate the performance of the call admission control scheme, which is based o...

A multi-level dynamic guard channels (MLDGC) scheme to efficiently provide priority access for handoff calls over new calls in cellular systems is proposed. The switch between levels is controlled by the number of dropped calls. Each additional level has an increasing number of guard channels as triggered by the number of dropped calls. An analytical formulation of the steady state probabilitie...

In this paper we propose a new wireless network architecture based on the integration of cellular with ad hoc relay technologies and ad hoc network with group mobility. In the traffic congestion environment, the conventional call admission control (CAC) scheme is not efficiently predict group mobility and is not feasible to support a burst call traffic due to group mobility. In this paper, we p...

In the present paper, we develop an adaptive algorithm for call admission control in wireless networks. The algorithm is built upon the concept of guard channels and it uses an adaptation algorithm to search automatically the optimal number of guard channels to be reserved at each base station. The quality of service parameters used in our study are the new call blocking probability and the han...

User mobility management is one of the important components of mobile multimedia environments. That is, mobile users should obtain network resources after handoff for seamless service supports. So, an adaptive handoff scheme has been proposed to minimize the connection dropping probability for handoff connections. This paper shows the comparative performance analysis for the adaptive QoS handof...

Dropping probability of handoff calls and blocking probability of new calls are two important QoS measures for cellular networks. Since the dropping probability of handoff calls is more important, call admission policies are used to maintain the upper bound of dropping probability of handoff calls. The fractional channel policy (FC) is a general call admission policy and includes most prioritiz...

The known channel allocation schemes in Personal Communications Service (PCS) operating with fixed guard channels for handoff calls can lead to fail in utilizing the limited channels such a wasting or lacking the number of guard channels, since the handof traflcs which depend on mobility of users are always not stationary. In this paper, we use F u z y Logic Controller (FLC) to generate proper ...

Call admission control (CAC) is important for cellular wireless networks to provide quality-of-service (QoS) requirements to users. Static and adaptive CAC schemes, respectively, make unrealistic assumptions about the distributions of the handoff call arrival process and the number of users in a cell. Handoff arrivals are usually assumed to follow Poisson process in static CAC schemes for Poiss...

A call admission control (CAC) algorithm used for WCDMA prioritized uplink for UMTS, which combines QoS tolerance and service differentiation by priority for voice, data, multimedia. This CAC algorithm gives preferential treatment to high priority calls, such as soft handoff calls, by reserving some bandwidth margin (soft guard channel), Power consumption, no. of users (load) to reduce handoff ...