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Modelling Restricted Accessibility for Wireless Multi-service Systems

Modelling Restricted Accessibility for Wireless Multi-service Systems,10.1007/11750673_8,Villy Bæk Iversen

Modelling Restricted Accessibility for Wireless Multi-service Systems   (Citations: 8)
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Some fundamental aspects of restricted availability and accessibility for multi-rate traffic are clarified. In classical teletraffic models all connections have the same bandwidth demand. In service-integrated systems each service has individual bandwidth requirement. For example in CDMA systems we may experience blocking (outage) even if the nominal capacity of a cell has not been fully used, because the actual capacity depends on interference from neighboring cells. Therefore, calls will experience individual accessibility. This paper presents a new theory and model for this problem. The model preserves the reversibility and insensitivity and generalizes the basic knowledge of classical teletraffic models. The theory is illustrated by a WCDMA traffic model.
Conference: EuroNGI - Network of Excellence - EURONGI , pp. 93-102, 2005
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    • ...The same results was obtained by a different approach for multi-rate traffic in [9]...

    Villy B. Iversen. Evaluation of Multi-service CDMA Networks with Soft Blocking

    • ...For a d-slot call, we have to choose the acceptance probability in state x as a function of the number of unit channels currently occupied and the bandwidth request as follows [5]:...
    • ...The process is reversible as the flow clockwise equals the flow counter-clockwise [5]...
    • ...Reference [5] extended the Delbrouck’s algorithm to include state-dependent blocking as shown in Fig. 1. If we consider a system with C unit channels and L traffic streams...
    • ...The relative global state probabilities q(x) for multi-rate loss systems with statedependent blocking can be calculated in a generalized recursion formula expressed as follows [5]:...
    • ...The carried traffic Yi of stream i measured in unit channels is given by [5]:...

    Hua Wanget al. Teletraffic Performance Analysis of Multi-class OFDM-TDMA Systems with...

    • ...The generalized recursion formula for multi-rate loss systems by Iversen [7] can be combined with the above model and we find the general formula:...
    • ...This is a natural requirement, and it can be shown to be a necessary and sufficient condition for maintaining the reversibility of the process [7]...
    • ...It is in principle easy to express all state probabilities by state zero, and then normalize [7]...

    Villy Bæk Iversen. Reversible Fair Scheduling: The Teletraffic Theory Revisited

    • ...A theoretical study of this phenomena can be done by means of teletraffic models taking into account the probability of soft blocking [1],[2]...
    • ...This is exact for special cases when blocking probabilities are chosen so that the process is reversible [2]...

    Villy Bæk Iversenet al. Dimensioning of Multiservice Links Taking Account of Soft Blocking

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