the latter phase where the subscriber base approaches the predicted numbers for 2005 in Table 7.1 when adding the 2G subscribers, i.e. ~1500K subscribers. 7.6.3 Circuit Switched Data Calls Assumptions From [1] for 64 kbps UDI we, assumed that 25% of the UMTS subscribers will also be CS data subscribers. We also assume that 50% of the calls will be UL + DL, 25% of the calls will be UL only and 25% of the calls will be DL only. This means, that one call will occupy two channels (one for DL and one for UL) but with a 75% usage each. CS data users may use multimedia with the following traffic mix: 1 data call per 24 h, with a duration of 30 min. We assume that 50% of these calls occur during busy hour (BHCA=0.5); 3% of the CS data users use this service; 1 data call per 3 h, with a duration of 5 min. It is assumed that 67% of these calls are done during busy hour (BHCA=0.67); 6% of the CS data users use this service. CS Data users may use other UDI services with the following traffic: 1 data call per 3 h, with a duration of 5 min. It is assumed that 67% of these calls are done during busy hour (BHCA=0.67); 3% of the CS data users use this service. 7.6.4 Packet Switched Applications Packet data traffic will have different requirements on delays, packet loss, etc. The rec- ommended classes include streaming, conversational, interactive and background. On this basis Table 7.6 illustrates the traffic mix of users and total traffic that may be applied. Table 7.6 Packet Traffic Mix Scenario Traffic classes % Users % Traffic Traffic BH (kbytes) Total Background Interactive Streaming Conversational Total * Note that each subscriber may use several applications. Deploying 3G Networks 7.6.5 Characteristic of CDMA Cells The factors affecting CDMA cell size, capacity, and co-channel parameters in the for- ward and reverse links include same cell interference and other cell interference. These events also have impact on the link power budgets. 7.6.5.1 Theoretical Capacity Here we look at capacity from the user interference side. 