y parameter planning is required for the CI-based positioning methods. The basic CI method is founded on serving-cell identity information and base station coordinates. The SMLC has to be able to find explicitly the correct cell, so the parameters enabling this need to be set to the SMLC. In GSM, in addition to CI, the cell identification parameters are for example LAC (Location Area Code) and BSIC (Base Station Identity Code). When considering the enhancing features for the CI methods, both GSM and WCDMA, there are more essential parameters. In this case the location estimate is no longer the coordinates of the base station and is common for all of the BTS sectors. More cell-level information needs to be given for the SMLC to increase the accuracy of the location estimation. The parameter settings in SMLC are vendor-specific (depending on the algorithms), but in the following can be found some ideas of relevant information both for CITARx and CI + RTT: antenna direction, antenna beam width, antenna height, BTS transmission power and terrain type. For the A-GPS method, network planning includes on both LMU unit location planning and parameter planning for the assistance of data delivery and context. The LMU unit locations need to be planned so that the LMU coverage is adequate but the number of used LMU units is kept as low as possible. It is question of balancing the costs (hardware and installation costs) and the coverage (assistance availability). Parameter planning for A-GPS is necessary when defining the conditions for the assistance of delivery. If fine-tuning is used (i.e. the MS receives one location estimate to get more specific instructions to create a second and more accurate estimate), then also needed are cell parameters to decrease the area where the MS location can be searched. The E-OTD method requires also LMU and parameter planning. Again the LMU plan- ning has to be cost-efficient. The first planning rule for the E-OTD method is: the MS has to be able to receive signals from at least three diff