Литература / UMTS-Report

12.4 System Level Simulation Results (UDD384)

System level simulations were conducted for the UDD384 packet services. The simulations were conducted in accordance with 0402 and SMG2 G18/97. A satisfied user is therefore defined as one in which a throughput of 10 % of the target bit rate can be maintained. Calls with packet services are never dropped. In a similar way to the circuit switched services a look up table is used to derive the block (or packet) error rate from the raw BER.

12.4.1 Outdoor to Indoor and Pedestrian A

System results for the UDD 384 services (Mode B) are shown in Figure 55 for the uplink and downlink. These results are for a system bandwidth of 3.2 MHz. The results are therefore likely to increase for the case of 15 MHz due to the availability of more channels and consequent decrease in blocking. The results are summarised in Table 15.

Table 15 UDD 384 Pedestrian Simulation Summary

12.5 System Level Simulation Results (UDD2048)

12.5.1 Indoor Office A

Preliminary results for the UDD 2048 services (Mode B) are shown in Figure 56 for the uplink and downlink. It is important to note that these are preliminary results and that the system parameters have not yet been optimised to yield the best performance. These results are for a system bandwidth of 15 MHz and a system with only one floor. The results are summarised in Table 16.

14.Annex

15.Annex

15.1 System Level Simulation Updates

During the preparation of the evaluation report new results with longer simulation time were carried out for the system level simulation. This annex contains the latest results achieved.

15.1.1 Vehicular A - LCD 384

This section contains new simulation results for the LCD 384 service in the Vehicular A environment, the corresponding chapter is 12.3.1.

Figure 57 shows the downlink system performance for the LCD 384 service in Vehicular A environment with different simulation times. It can be seen that the results produced by the 1200 second simulation produce higher system load figure than those with the 120 second simulation.

Figure 57 Downlink simulation system performance with different simulation time

15.1.2 Speech

This section contains new simulation results for the speech service in the Vehicular A environment, the corresponding chapter is 12.2.2.

Figure 58 shows the system performance of the speech service with 15 MHz bandwidth, Vehicular A environment and 480 seconds observation time. The call duration has also been reduced to 40 seconds.

System Load [kbps/cell/MHz]

Figure 58 System load performance (Speech) with longer observation time (480 s)

As can be seen from these results the longer simulation time causes a smoother load curved to be produced due to the improved statistics of the simulation results. What is more important, however, is that system load for 98 % satisfied user is higher (increase of 10%) for the longer simulation time. This indicates that the results shown in the Evaluation report are pessimistic.

15.1.3 UDD 384 - Pedestrian A

This section contains new simulation results for the UDD384 service in the Pedestrian/Indoor to Outdoor environment, the corresponding chapter is 12.4.1.

These are initial result for the downlink for mode A of UDD services.

The simulation has not terminated to the 98% user satisfaction, but the performance of mode A are better than for mode B.

The PDF graphs shown in Figure 61, Figure 62, Figure 63 are shown for three different loads 420, 290 and 155 kbit/s respectively. The two vertical lines indicate the PDF at 10 % of the of the target bit rate (38.4 kbit/s ) and 100 % of the target bit rate (384 kbit/s).

Figure 61 - PDF of mean bit rate at system load of 420 kbit/s/MHz/cell

Figure 62 PDF of mean bit rate for system load of 290 kbit/s/MHz/Cell

Figure 63 PDF of mean bit rate for system load of 155 kbit/s/MHz/Cell