Abstract
When the blocking probability of the traffic between nodes is to be estimated in the free access network with selective circuits, the loss generated by the channel mismatch between the originating/terminating node and the circuit group must be considered. This paper proposes a method of estimating the mismatch probability, considering the properties of the free access network construction. The estimation method is proposed with the following features: (1) the effect of mismatch on the joint connection distribution for the circuit group and all nodes is considered; (2) the number of simultaneous connections and connection probability on more than one circuit is considered; and (3) the different mismatch probability is considered for each originating and terminating node pair. Based on the actual result of estimation, the effects of the network construction conditions (number of time slots, number of circuits, and the number of access devices) as well as the time-slot selection method in channel assignment are examined. The effect of the mismatch for the case of multitraffic is evaluated by traffic simulation. A method is proposed to improve the blocking probability for the high-speed calls, considering the mismatch condition. The effect also is evaluated by the traffic simulation.
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