n this calculation. TDD is assumed to have three downlink slots followed by one slot with a 10-symbol uplink, 10.3 Practical Data Rates 2-symbol guard and 2-symbol uplink part, and one full uplink slot. The downlink peak rates with these assumptions are 111 Mbps for sub-1-GHz, 1.80 Gbps for 3.5 GHz, and 5.2 Gbps for 28 GHz with a coding rate of 0.93. The corresponding uplink rates are 42, 104 and 803 Mbps. A coding rate of 1.0 means no coding, and the downlink peak rates would be 120 Mbps, 1.95 Gbps, and 5.6 Gbps. The relative data rates in the downlink and in uplink can be adjusted according to the downlink-uplink ratio in TDD. Practical Data Rates 10.3.1 User Data Rates at 2.5-5.0 GHz Practical user data rates will be lower than the theoretical peak rates. The data rates depend on a number factors including bandwidth, signal levels, inter-cell interference levels, and on the number of simultaneous users. We illustrate example data rates with a 3.5 GHz urban deployment using 100 MHz bandwidth and massive MIMO three-sector antennas with 100 W maximum output power. The inter-site distance is 500 m, and the base station (BTS) antennas are located on rooftops 25 m above ground level. The time allocation between the downlink and uplink in TDD is 4:1. UEs are assumed to have four receive antennas. 80% of UEs are located indoors and 20% outdoors. The traffic model is 0.5 MB file transfer. The results are illustrated in Figure 10.2 for the downlink and in Figure 10.3 for the uplink both for average data rates and for cell edge data rates. Three different loading levels are shown: 16, 32, and 48 UE arrivals per second. The rate of 16 UEs each with 0.5 MB download corresponds to a cell throughput of 64 Mbps, which is relatively low loading. The average data rate in downlink is 400-500 Mbps with low load- ing with 16TRX and 64TRX. The corresponding cell edge data rate is 130-140 Mbps. When the loading increases, the data rates decrease. With 48 UE arrivals per second, User throughput in downlink 64TRX 16TRX 64TRX 16TRX 64T