 on HSPA. These tools include a detailed simulation of the users within multiple cells. The fast fading is explicitly modeled for each user according to the ITU Vehicular-A profile. Regarding the methodology, this kind of quasistatic simulator is based on descriptions in [3]. A wraparound multi-cell layout modeling several layers of interference is utilized in this study. The main parameters used in the system simulation are summarized in Table 10.4, where UE moving speeds other than 3 kmph are mostly applied to investigate the effect of the mobility on the performance of the DL. © 2009 by Taylor & Francis Group, LLC Long Term Evolution: 3 GPP LTE Radio and Cellular Technology Table 10.4 Simulation Parameters Settings Parameter Value System Configuration Inter-site distance 2.8 km Cell configuration ITU Veh-A, macrocell Voice call mean length 60 seconds UE speed 3 (30, 50, 90) kmph Outage observation window length 10 seconds Cell outage threshold Residual FER HSUPA Specific Configuration Receiver 2 antenna RAKE with MRC combining Frame size 2 ms/10 ms Channels E-DCH/DPCCH Number of HARQ channels 8 (2ms TTI)/4 (10ms TTI) Max number of L1 transmissions 4 (2ms TTI)/2 (10ms TTI) Uplink delay budget 80 ms Scheduling algorithm Non-scheduled HSDPA Specific Configuration Receiver 1 antenna RAKE with MRC combining Frame size Channels HS-DSCH/CPICH/HS-DPCCH Number of HARQ channels Max number of L1 transmissions Max code-multiplexing users Number of codes Total BS transmission power HS-DSCH power Downlink delay budget 80 ms 10.7.1.2 Simulation Results and Analysis VolP performance in HSUPA The UL capacities for VoIP over HSUPA are presented to evaluate the performance of some advanced solutions as described in Section 10.6.1.1. For the 2 ms TTI without UL packet bundling, Figure 10.16 shows UE power distribution for 60 UEs/cell for gat- ing DPCCH and continuous DPCCH. It may be noted that there can be huge power savings by applying DPCCH gating. The exact power savings level would depend © 2009 by Taylor & Francis Group, LL