In this paper we developed the method for determination of output power of base station as the function of distribution of users' density in one GSM cell. The method consists of several steps: determination of the function of density distribution (PDF) and function of distribution (CDF) of distance between user and base station, finding PDF of output power of one GSM channel. In order to prove calculated results, we developed the program for simulating seizure and release channels in one GSM cell. It is necessary that inverse function of CDF of distance between user and base station exists in order to implement this program. This simulation program can be used to estimate CDF of total emission power of base station. Calculation of CDF of total emission power is, except in simplest cases, pretty complicate.

In this paper we calculate the distribution of output power of traffic channels of base station in GSM network depending on the traffic load. The principle of the calculation is to find the distribution of the output power of one traffic channel, and then to combine this distribution with the distribution of the number of busy traffic channels. Numerical example refers to the simplest distributions, but the principle can be implemented on the more complicate distributions.Key words: GSM network, BTS, Output power, Telephone traffic, Probability density function Proračun funkcije raspodjele srednje izlazne snage bazne stanice u GSM-u. U radu se izračunava raspodjela izlazne snage bazne stanice u GSM mreži u ovisnosti o prometu. Princip računanja je nalaženje raspodjele izlazne snage jednog prometnog kanala, a zatim kombiniranje ove raspodjele s raspodjelom broja zauzetih prometnih kanala. Brojčani se primjeri odnose na najjednostavnije raspodjele, ali se princip može primijeniti i na složenije.

In this paper we analyze the influence of the connections between users, belonging to the same cell, on the increase of traffic loss. The utilization of Erlang model in this case gives underestimated loss. We calculate some simple examples in the case of GSM. Several numerical examples prove that traffic loss increases with the increase of intra-cell traffic in total traffic and with the increase of the number of channels in the group. The results are confirmed by the computer simulation.

In this paper we analyze the influence of users' density distribution in one cell of CDMA mobile network (ie adjusted power control on the forward link) on base station emission power. This influence is analyzed for different circles radii around base station within which same emission power is generated for all mobile users, and for different values of propagation loss coefficient. It is proved that emission power in this cell must be increased comparing to the similar cell, which uses complete power control. The power increase is greater when greater number of users are situated near base station, and for greater values of propagation loss coefficient. The results are presented, illustrated by numerical examples and verified by simulation for three users' density distributions: uniform, decreasing and increasing density from the base station to the cell rim. The simulation process, which is based on random traffic process, is presented briefly.

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