Abstract-In this paper, we investigate possible timecorrelation of answered call arrivals in sets of real GSM telephone traffic data. Instead of attempting to model the empirical distribution of the call interarrival time, as done in several previous works in literature, we emphasize results obtained by the Modified Allan Variance (MAVAR), a widely used time-domain quantity with excellent capability of discriminating power-law noise types. The call arrival rate exhibits a diurnal trend, with peak hours in the morning and late afternoon. Besides this diurnal rate change, the number of call arrivals in a second is found perfectly uncorrelated to the number of arrivals in other seconds and Poisson distributed, with good consistency by X 2 -test evaluation. Uniform and accurate whiteness of call arrivals per second is verified in all hours, regardless the time of the day. In all series analyzed, the empirical statistics of both originated and terminated call arrivals proves excellent consistency with the ideal Poisson model with diurnal variable rate λ(t). This study may be valuable to researchers concerned about realistic traffic modelling in planning and performance evaluation of cellular networks.
Congestion control is required in ATM (Asynchronous Transfer Mode) networks to fairly allocate network resources to the various service types and mixes carried out by the high speed wide area networks. Admission control is one of the congestion control mechanisms to be executed at the virtual call set-up. Access nodes decide to accept or reject a connection request based on a description of the traflc anticipated by the bursty source and of the traflc load encountered by the connection along the network route. To each new connection an appropriate bandwidth is assigned in order to ensure that the cell transport performance (cell losses and delay) remains at a satisfactory level for all users.This paper reports some simulation results for mixes of bursty traffic on a network employing a proposed mechanism for bandwidth assignment called "Class Related Rule". The allocation of virtual calls into a trunk group of ATM links using this bandwidth assignment mechanism is further investigated via simulation in order to ensure given virtual call blocking objectives (call losses).
Congestion control is required in ATM (Asynchronous Transfer Mode) networks to fairly allocate network resources to the various service types and mixes carried out by the high speed wide-area networks. Admission control is one of the congestion control mechanisms to be executed at the virtual call set up. Access nodes decide to accept or reject a connection request based on a description of the traffic anticipated by the bursty source and of the traffic load encountered by the connection along the network route. To each new connection an equivalent bandwidth is allocated in order to ensure that the cell transport objectives (cell losses and delay) remain at a satisfactory level for all users.This paper investigates the concepts of the equivalent bandwidth of bursty traffic and reports some simulation results of statistical multiplexing of homogeneous and heterogeneous bursty sources. The simulation tests show that in many significant traffic mixes the defined equivalent bandwidth value results to be rather constant. 318.6.2.
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