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3 Poznan University of Technology Academic Journals. Electrical Engineering

3 2007

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Multi-rate overflow traffic modeling

100%

Głąbowski M. , Kubasik K. , Stasiak M.

tom No 54

49-56

The article proposes an analytical method for determining basic traffic characteristics of systems which are offered overflow traffic composed of multi-rate traffic streams. The described analytical model enables determination of parameters of traffic overflowed from primary groups for systems servicing single and multi-service switching networks with overflow traffic on the basis of Ka u f man-Roberts model for full-availability group with a Poisson requests distribution stream. Additionally, a method for determining a channel occupancy distribution in the alternative group with traffic overflowed from primary groups in their occupation state has been also presented. Analytical calculation results of blocking probability calculated using the presented methodology have been compared with the data obtained from the system simulation process.

Average bandwidth offered to the user of the UMTS-HSDPA

100%

Głąbowski M. , Hanczewski S. , Stasiak M.

tom No 54

41-48

The article discusses an analytical method of determining average bandwidth offered to the user in the UMTS system applying HSDPA (High-Speed Downlink Packet Access) technology. The application of HSDPA increases the transmission speed between the base station and the end-user's terminal in the UMTS networks. This has, in turn, made it possible for cellular systems operators to offer new services that require greater data flow in the downlink direction such as, e.g., broadband Internet access.

Modelling of the influence of connection handoff on UMTS traffic characteristics

100%

Głąbowski M. , Sobieraj M. , Stasiak M.

tom No 54

57-64

The paper presents a model of a group of cells, exploiting the effects of connection handoff between cells, aimed at increasing the traffic capacity of a system. The analytical model proposed is based on the model of limited-availability group, which makes it possible to determine basic traffic characteristics in the system under consideration. In the paper it is applied the generalized model of the limited-availability group, i.e. the group which consists of separated transmission links of various capacities. The results of analytical calculations of blocking probability in a group of UMTS cells were compared with simulation data, which confirmed high accuracy of the proposed method.