Ankit Saxena and Ravi Sindal
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LTE, link adaptation, EUTRAN, open-loop uplink power control(OLUPC), closed-loop uplink power control (CLUPC)
The evolution in mobile access technology improves radio resources utilization. In a wireless network, power constraints are observed at both links of communication, uplink (UL) towards the base station and downlink (DL) towards user equipment (UE). In DL, there are multiple sources of power available, but towards UL, there are limited power sources, that is, batteries. In this paper, we evaluate the performance of an open-loop and a closed-loop power control for LTE, through a comprehensive simulation with the help of key performance indicators (KPIs), and identify an optimum solution. We measure different KPIs such as inter-cell interference, signal- to-interference noise ratio (SINR), reference signal received power (RSRP), throughput, spectral efficiency and power spectral density (PSD) for typical networks. As per our results, the performance of open-loop uplink power control (OLUPC) is better for an edge or boundary UE in comparison with closed-loop uplink power control (CLUPC). Furthermore, for the optimal solution in CLUPC, we tuned the value of the compensation factor (α) to meet the trade-off between high UL throughput and SINR. The conclusion of this work is that the best optimum solution can be obtained by selecting values of α near 0.95 for CLUPC and that this optimum solution gives better results in terms of good radio signal condition and UL throughput.
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