Design, Deployment and Performance of 4G-LTE Networks: A Practical Approach

6.7 LTE Throughput and Capacity Analysis

6.7.1 Served Physical Layer Throughput Calculation

The DL and UL capacities (achievable throughput) are impacted by the total BW (1.4, 3, 5, 10, 15, and 20 MHz), the total overheads, and the spectral efficiency, which is determined by the DL SINR. In the LTE system, the UL capacity is divided between control channels and signals (SRS, DM-RS, PRACH) and the traffic channel, that is, PUSCH. Based on the RE/RB definition in this chapter, we can define the following:

1. One RB = 84 RE, one subframe contains 168 RE, and one subframe contains two RB.
2. Then one subframe = 12 (subcarriers) × 7 symbols × 2 (Slot) = 168 RE (normal CP)
3. The MCS is defined as , then the served physical layer UL throughput can be estimated based on the following formula
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4. assuming the control channels/signals in the UL consumes 24 RE and is the number of RB in the UL.
5. Similarly, the served physical layer DL throughput can be calculated according to the following formulas:
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6. Assuming the control channels in DL consume 36 RE and the RSs in DL occupy 12 RE. The MG is ...