Empirical Differences in LTE Open- and Closed-Loop power Control

Published

February 10, 2022

Author(s)

Azizollah Kord, Jason Coder, Aric Sanders

Abstract

We present the empirical Physical Uplink Shared Channel (PUSCH) radiated power of a User Equipment (UE) in a commercial Long-Term Evolution (LTE) frequency division duplex system. We measured the radiated PUSCH channel power while varying 28 different system factors. Of these 28 factors, 20 were related to the E-UTRAN Node B (eNB) settings, and eight were related to UE behavior (e.g., RSRP, network loading, UE use case, etc.). This experiment was performed to examine the impact of each of the 28 factors on the radiated emissions of LTE UEs. Here, we address only the impact of power control on the radiated UE emissions. Examining the results of two cases, RSRP equal to -78 dBm and -98 dBm, we show significant differences in UE emissions related to the power control algorithm. We discuss the difference in detail and note that the UE may not be following the power control equation in all cases. One limitation of this work is that only two serial numbers of one UE model were tested. Additional work would need to be done to characterize other UEs. The results can have implications for those looking to model or control LTE emissions.

Proceedings Title

2022 IEEE 19th Annual Consumer Communications & Networking Conference (CCNC)

Conference Dates

January 8-11, 2020

Conference Location

Taipei, TW

Pub Type

Conferences

Keywords

LTE, PUSCH, Power Control, Open Loop, Close Loop

Citation

Kord, A. , Coder, J. and Sanders, A. (2022), Empirical Differences in LTE Open- and Closed-Loop power Control, 2022 IEEE 19th Annual Consumer Communications & Networking Conference (CCNC), Taipei, TW (Accessed April 28, 2024)