Håkan Olofsson

Multiple reuse patterns for frequency planning in GSM networks

Providing high capacity in GSM networks at low costs using existing macrocells is of increasing importance in the near future due to the competition between operators. This paper shows that by applying frequency hopping in combination with an advanced frequency planning method, multiple reuse patterns, very high traffic levels in the existing macrocells can be supported. Field experience from live networks shows that an average frequency reuse factor as low as 7.5 is possible without negatively affecting the network quality. Thus, the network capacity can be doubled compared to a non hopping network with reuse 4/12 using 10 MHz frequency spectrum. In a macrocell, it is possible to carry as much as 43 Erlang at 2% blocking.

A test system for evaluation of the WCDMA technology

Wideband CDMA (WCDMA) has been selected as the radio access technology for UMTS/IMT-2000 in Europe and Japan. Detailed specification is under discussion in standardization bodies throughout the world. This paper presents and discusses performance results derived with a WCDMA based test system in laboratory and field experiments. The test system is employed to study and demonstrate wireless multimedia applications. Extensive investigations of the performance of the WCDMA technology have been conducted. Our performance results verify that WCDMA is a mature access technology, ready to meet the requirements defined for third-generation mobile radio.

Cell search performance in UTRA

The performance of the cell search algorithm proposed in UTRA has been evaluated using Monte Carlo simulations. Results indicate that for a handover scenario, synchronisation can in average be achieved within 110 ms for all evaluated environments when the average power of the synchronisation channel equals 0.5 percent of the total transmission in the target cell.