Table 1 Potential parametrization of a 5G radio access network using different frequency bands
From: 5G transport network requirements for the next generation fronthaul interface
Parameter | Symbol | Unit | 4G | 5G | ||
|---|---|---|---|---|---|---|
LTE | Sub-6 | Low mmWave | High mmWave | |||
Carrier frequency | f C | GHz | 2 | 2 | 30 | 70 |
Channel size | BW | MHz | 20 | 100 | 250 | 500 |
Sampling rate | f S | MHz | 30.72 | 150 | 375 | 750 |
# antennas | N A | – | 4 | 96 | 128 | 256 |
# ADC/DAC chains/layers | N L | – | 4 | 16 | 12 | 10 |
Overhead (control, line coding) | γ | – | 1.33 | 1.33 | 1.33 | 1.33 |
Quantizer resolution time domain | N Q,T | bit | 15 | 15 | 12 | 10 |
Quantizer resolution frequency domain | N Q,F | bit | 9 | 9 | 8 | 7 |
Modulation order | M MCS | – | 64 | 1024 | 256 | 64 |
Max. code rate | R C,MCS | – | 0.85 | 0.85 | 0.85 | 0.85 |
Frame duration | T F | ms | 1 | 1 | 1 | 1 |
FFT size | N FFT | – | 2048 | 2048 | 2048 | 2048 |
# active subcarriers | N SC,act | – | 1200 | 1300 | 1300 | 1300 |
# data symbols per frame | N Sy | – | 14 | 70 | 150 | 300 |
Peak utilization | μ | – | 1 | 1 | 1 | 1 |
Resulting requirements | ||||||
Channel coherence time at v = 3 km/h (2) | T C,3 | ms | 76.17 | 76.17 | 5.08 | 2.18 |
Channel coherence time at v = 50 km/h (2) | T C,50 | ms | 4.57 | 4.57 | 0.30 | 0.13 |
Channel coherence time at v = 500 km/h (2) | T C,500 | ms | 0.46 | 0.46 | 0.03 | 0.01 |
Delay accuracy (3) | T J | ns | 65 | 13.33 | 5.33 | 2.67 |
Peak data rate split A (1) | D A | Gbps | 4.9 | 95.8 | 143.6 | 199.5 |
Peak data rate split B (4) | D B | Gbps | 1.6 | 34.9 | 49.8 | 72.6 |
Peak data rate split C (5) | D C | Gbps | 0.46 | 16.5 | 21.2 | 26.5 |