Cellular system information capacity change at higher frequencies due to propagation loss and system parameters

In this paper, mathematical analysis supported by computer simulation is used to study cellular system information capacity change due to propagation loss and system parameters (such as path loss exponent, shadowing and antenna height) at microwave carrier frequencies greater than 2 GHz and smaller cell size radius. An improved co-channel interference model, which includes the second tier co-channel interfering cells is used for the analysis. The system performance is measured in terms of the uplink information capacity of a time-division multiple access (TDMA) based cellular wireless system. The analysis and simulation results show that the second tier co-channel interfering cells become active at higher microwave carrier frequencies and smaller cell size radius. The results show that for both distance-dependent: path loss, shadowing and effective road height the uplink information capacity of the cellular wireless system decreases as carrier frequency increases and cell size radius R decreases. For example at a carrier frequency fc = 15.75 GHz, basic path loss exponent α = 2 and cell size radius R = 100, 500 and 1000m the decrease in information capacity was 20, 5.29 and 2.68%

Minimum cell size for information capacity increase in cellular wireless network

In this paper results of mathematical analysis supported by simulation are used to find a theoretical limit for cell size reduction in mobile communication systems. Information capacity approach is used for the analysis. Attention is given to the active co-channel interfering cells. Because at microwave frequencies beyond 2 GHz, co-channel interfering cells beyond the first tier becomes dominant as the cell size reduces. We show that when the cell size limit is reached any further reduction in cell size will not increase the information capacity of the cellular network. A formula is derived for calculating the number of co-channel cells in subsequent tiers

Sensitivity of information capacity of land mobile cellular system to propagation loss parameters at higher microwave frequencies

In this paper, results of mathematical analysis supported by simulation are used to investigate the impact of propagation loss on the performance and information capacity of cellular wireless network at higher microwave carrier frequencies (beyond 2 GHz). At higher microwave carrier frequencies co-channel interfering cells beyond the first six co-channel cell becomes active as the cell size reduces. It is shown that the second tier co-channel interfering cell is more dominant at lower (below 2.5) path loss exponent

Sensitivity of information capacity of land mobile cellular system to the base station antenna height at higher microwave frequencies

In this paper, mathematical analysis, supported by simulations is used to study the impact of base station antenna height on the performance of land mobile cellular network. The performance is evaluated in terms of the uplink information capacity of the cellular wireless network, when both the first six co-channel interfering cells (first tier) and those beyond it are considered to be dominant. It is shown that at microwave frequencies beyond 2 GHZ as the antenna height increases the area spectrum efficiency of the land mobile cellular network decreases

Impact of vehicular traffic on information capacity of cellular wireless network at carrier frequencies greater than 3 GHz

In this paper we describe a simulation study of the impact of vehicular traffic on the performance of cellular wireless network at microwave carrier frequencies above 3 GHz and up to 15 GHz, where the first and subsequent tiers co-channel interfering cells are active. The uplink information capacity of the cellular wireless network is used for the performance analysis. The simulation results show that vehicular traffic causes a decrease in the information apacity of a cellular wireless network. Results also show that for both light and heavy vehicular traffic environment, the nclusion of subsequent tier co-channel interferences caused a decrease of between 3 - 12% in the information capacity of the cellular wireless network as compared to the case, when only the first tier co-channel interferences are active