RX 16TRX Loading [UE arrivals/s] Average Cell edge Figure 10.2 User data rates in the downlink with 3.5 GHz spectrum and 100 MHz bandwidth. 10 5G Performance User throughput in uplink 64TRX 16TRX 64TRX 16TRX 64TRX 16TRX Loading [UE arrivals/s] Average Cell edge Figure 10.3 User data rates in the uplink with 3.5 GHz spectrum and 100 MHz bandwidth. the average user throughput is 180-240 Mbps, which is an approximately 50% lower data rate than with 16 UE arrivals per second. The cell edge throughput drops relatively more with a higher loading than does the average throughput. With 48 UE arrivals per second, the cell edge throughput is 35-50 Mbps, which is a 70% lower data rate than with 16 UE arrivals per second. The reason for this is that a higher inter-cell interfer- ence has a relatively larger impact on the cell edge data rates than on the average data rates. Uplink data rates are substantially lower than downlink data rates mainly because the downlink is allocated four times more time than the uplink in this simulation. The aver- age uplink data rate is 90 Mbps with 64TRX and drops to 50 Mbps with 16TRX and higher loading. We note that the difference between the average and cell edge through- put in the uplink is 8-10 times while in the downlink it is 3-5 times. The reason for this is that the uplink data rates are mainly noise limited in macro cells, and the UE trans- mission power is the limiting factor in the uplink cell edge data rates. The downlink data rates are mainly interference limited. 10.3.2 User Data Rates at 28 GHz The data rate discussion above focused on frequencies below 6 GHz. The following sim- ulations in urban micro cells consider data rates with 28 GHz spectrum. The assump- tion is that all UEs are outdoors, the inter-site distance is 50-100 m, the base station antenna height is 10 m, and the base station power is 6 W with an 8 8 antenna con- figuration. The results are shown in Figure 10.4. The simulations show a median data rate of 1.6 Gbps, a peak rate of 6 Gbps, and at the cell edge 0