and (700 MHz) has a higher uplink SINR due to better signal propagation since the uplink performance is limited by the UE output power. Figure 10.68 System-level reliability evaluation. SINR distribution in system level Control channel Data channel link linkperformance performance Impact of HARQ Impact of HARQ retransmission retransmission System-level radio reliability performance 10 5G Performance PDCCH link performance 1.0E-01 - Aggregation 16 Aggregation 8 Aggregation 4 1.0E-02 1.0E-03 1.0E-04 1.0E-05 1.0E-06 SINR [dB] Figure 10.69 Physical Downlink Control Channel (PDCCH) performance. The link performance of the PDCCH is shown in Figure 10.69, where the performance for the aggregation levels of 4, 8, and 16 are shown. The results show that the link-level reliability can be improved by higher aggregation levels. The simulations use a 39-bit payload on one OFDM symbol with precoder cycling at 4 GHz. The link performance of the PDSCH/PUSCH was simulated for mini-slots with four and seven OFDM symbols per slot using a 30 kHz subcarrier spacing using a non-LOS channel (363 ns delay spread). The results are shown in Figure 10.70. The number of data bits per slot was 256 bits (32 bytes, cyclic redundancy check [CRC] overhead not con- sidered) for four symbols per slot and 288 bits (36 bytes, with CRC overhead) for seven symbols per slot. The results show that the seven-symbol mini-slot with a longer trans- mission time has better performance than the four-symbol mini-slot. The 1 ms latency requirement with URLLC can be met with these four- and seven symbol mini-slots. From these results, we can see that an SINR of at least 5.4 dB is required to achieve a BLER of less than 10-5 with seven symbols/slot. With seven symbols/slot, an SINR of at least 7.6 dB is required. These values provide a lower bound for data channel reliability, as control channel reliability is also taken into account. The total reliability is calculated by using the methodology where the effects of the control and data channel reliability are com