and direction. In complicated planning situations there are some ways to enhance the coverage. These tricks are best to use during the planning phase, because it is more complicated and costly to do it later. These tricks do not reduce the importance of careful planning, as there is no way to find a better location of incorrectly located base stations except to change it to a better position. One method to enhance the coverage is to optimise the link budget parameters within the given range, using as high BTS powers as possible and having high gain antennas. Another method is to use supplementary hardware for coverage enhancement. A booster amplifies the BTS transmission and in this way strengthens downlink. A mast head amplifier strengthens uplink by giving more sensitivity to BTS and enables the reception of weaker signals. The coverage and capacity requirements are important to meet but at the same time planning has to target clear cell dominance areas. BTS powers and antenna heights need to be considered and downtilts (both electrical and mechanical) used when needed. As already mentioned, in the planning phase the coverage calculation range has to be wide in order to detect interfering reflections. It is specified that the BTS and MS must measure the received signal level within the range of - 110 dBm to -48 dBm. The measured signal levels are averaged while mapped to RXLEV (received level) values, which are between 0 and 63. The signal levels are reported as RXLEV values. The mapping is presented in Table 2.10. The radio link measurements also include received signal quality measurements. In a similar way to signal level measurements the measured signal quality is averaged and mapped to the RXQUAL (received quality) value. There are eight RXQUAL categories and the mapping table is gevin in Table 2.11. Table 2.11 BER mapping to RXQUAL RXQUAL BER range RXQUAL 0 BER < 0.2 9 % RXQUAL 1 0.2% < BER < 0.4% RXQUAL 2 0.4% < BER < 0.8% RXQUAL 3 0.8% < BER < 1.6% RXQUAL 4 1.6% < BER < 3.2% RXQUAL 5 3.2% < BER < 6.4% R