48 research outputs found

    Adaptive admission/congestion control policy for hybrid TDMA/MC-CDMA integrated networks with guaranteed QoS

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    Future networks are expected to have the ability to accommodate variety of users, each with its own transmission characteristics and QoS requirements to be maintained. Compatible multiaccess system should provide the means to control (i.e. admission/congestion) the flow of traffic and at the same time maintain the QoS requirements. This paper investigates the performance of a novel measurement-based admission/congestion control policy over a hybrid TDMA/MC-CDMA platform. The practicality and several performance measures of the new system shall be analyzed analytically under a wide range of expected traffic characteristics (bit rate, transmission activities, etc.) for the future wireless networks. The adaptive admission/congestion control policy has effectively maintained the required QoS. It is worth to emphasize here that our proposed admission/congestion control polices apply preventive admission control as well as reactive congestion control

    Performance of Heterogeneous Traffic in Roaming Based Sharing Multi-Operator WCDMA Networks

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    Today, sharing radio resources is very important to reduce the cost of network infrastructure. Mobile companies can buy a certain capacity of the shared network depending on their budget and number of subscribers that they can handle. In this way, the subscribers of each operator connect to the same radio access network and can be differentiated through roaming based mechanisms. The analysis of voice traffic and video streaming for shared networks has been discussed in the literature. In this paper, an extended work has been done to study the effect of heavy data traffic like www and FTP on the shared network and how the radio resources with roaming based mechanism may be allocated to the sharing operators. One particular mechanism based on radio resource management (RRM) with preemptive priority queuing in admission control is discussed in details. The results show the effectiveness of the dynamically prioritization mechanism for allocating radio resources to the requested service. Also, it shows an outstanding performance for RT users compared with non preemptive scheme with little degradation for NRT users

    Performance of Heterogeneous Traffic in Roaming Based Sharing Multi-Operator WCDMA Networks

    Get PDF
    Today, sharing radio resources is very important to reduce the cost of network infrastructure. Mobile companies can buy a certain capacity of the shared network depending on their budget and number of subscribers that they can handle. In this way, the subscribers of each operator connect to the same radio access network and can be differentiated through roaming based mechanisms. The analysis of voice traffic and video streaming for shared networks has been discussed in the literature. In this paper, an extended work has been done to study the effect of heavy data traffic like www and FTP on the shared network and how the radio resources with roaming based mechanism may be allocated to the sharing operators. One particular mechanism based on radio resource management (RRM) with preemptive priority queuing in admission control is discussed in details. The results show the effectiveness of the dynamically prioritization mechanism for allocating radio resources to the requested service. Also, it shows an outstanding performance for RT users compared with non preemptive scheme with little degradation for NRT users

    Use of anticoagulants and antiplatelet agents in stable outpatients with coronary artery disease and atrial fibrillation. International CLARIFY registry

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    Malaria endemicity and co-infection with tissue-dwelling parasites in Sub-Saharan Africa: a review

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