); but will have the capability of offering transmission rates up to 2 Mbps. Thus, the picocell coverage will reach mainly the of- fice and home environment. 7.8.2.1 Upper Bound Examples FDD To illustrate the radio network dimensioning based on the assumptions and principles of the preceding sections, here we take the upper bound values shown in Table 7.11. Thus, using the figures from the aforementioned table we can deduce average data volume, per subscriber, at busy hour, on the DL as shown in Table 7.13. Table 7.13 Data Volumes for PS and CS Traffic Average PS* traffic per subscriber at BH (DL) Average CS traffic per subscriber at BH (DL) Average total voice CS traffic per subscriber at BH (DL) We assume LCD 144 as packet for the CN. To have a concrete point of reference in terms of coverage area and number of sites we illustrate values for an existing 17 2G 1800 MHz GSM network. In such a network, if we can assume that about 70% of sites can be re-used, then we will have co-siting of GSM and UMTS sites. The remaining sites would then be UMTS sites only. Table 7.14 illus- trates hypothetical values as examples. Note that the three sector sites with 1 + 1 + 1 carrier configuration; however, some dense areas may need 2 + 2 + 2 or 3 + 3 + 3. On the other hand, it is believed that capacity will not be an issue at the introduction of UMTS. Table 7.14 Reference Scenario for 75% Coverage Sites GSM sites usable for UMTS New UMTS sites (D-urban and urban for capacity): New sites replacing GSM sites not capable of support- ing UMTS Total Cells RF carriers Sites in urban Sites in suburban Sites in rural Total 17 A reference network for illustration only The UMTS Network and Radio Access Technology To calculate the multi-service link budget we use the WCDMA parameters assumed in Table 7.15. Table 7.15 Selected Link Budget Parameters for WCDMA FDD dedicated parameters Downlink Upling Chip rate 3.8 Mch/s 3.8 Mch/s Path loss imbalance Averaged PSCH Ec/It synchronization channels -15 dB Activity factor in synchronization chan