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Validation of 3GPP TR 38.901 Indoor Hotspot Path Loss Model Based on Measurements Conducted at 6.75, 16.95, 28, and 73 GHz for 6G and Beyond

Hitesh Poddar, Tomoki Yoshimura, Art Ishii

TL;DR

The paper validates the 3GPP TR 38.901 Indoor Hotspot path loss model for LOS and NLOS across the 7-24 GHz band (and the broader 0.5-100 GHz range) using NYU WIRELESS measurements at 6.75, 16.95, 28, and 73 GHz. It derives FI parameters at 6.75/16.95 GHz and ABG parameters for the 7-24 GHz and 0.5-100 GHz bands, comparing them to the TR 38.901 equations: $PL^{FI} = \alpha + 10\beta\log_{10}(d_{3D}) + \sigma_{SF}$ and $PL^{ABG} = \beta + 10\alpha\log_{10}(d_{3D}) + 10\gamma\log_{10}(f_c) + \sigma_{SF}$. The results show close agreement between measured data and the TR model (key parameters within small tolerances) and confirm the model’s validity for Indoor Hotspot propagation in the tested bands, while highlighting sensitivity of ABG parameters to frequency sampling and the need for broader data across environments. Overall, the study informs 6G standardization by validating the TR 38.901 InH model and outlining directions for more robust ABG/FI tuning and broader validation across frequencies and environments.

Abstract

This paper presents a thorough validation of the Third Generation Partnership Project (3GPP) Technical Report (TR) 38.901 indoor hotspot (InH) path loss model, as part of the 3GPP Release 19 study on "Channel model validation of TR 38.901 for 7-24 GHz," for 6G standardization. Specifically, we validate the 3GPP TR 38.901 path loss model for the InH scenario in both line of sight (LOS) and non line of sight (NLOS) channel conditions, using the floating intercept (FI) and alpha-beta-gamma (ABG) path loss models. The validation focuses on specific frequencies, including 6.75 GHz and 16.95 GHz, as well as the broader 7-24 GHz and 0.5-100 GHz frequency ranges. The validation is based on real-world measurements conducted at 6.75 GHz, 16.95 GHz, 28 GHz, and 73 GHz by NYU WIRELESS using a 1 GHz wideband time domain based sliding correlation channel sounder in the InH scenario for both LOS and NLOS channel conditions. Our results confirm that the 3GPP TR 38.901 path loss model for the InH scenario remains valid for the 7-24 GHz range in both LOS and NLOS conditions and provide valuable input for 6G standardization efforts.

Validation of 3GPP TR 38.901 Indoor Hotspot Path Loss Model Based on Measurements Conducted at 6.75, 16.95, 28, and 73 GHz for 6G and Beyond

TL;DR

The paper validates the 3GPP TR 38.901 Indoor Hotspot path loss model for LOS and NLOS across the 7-24 GHz band (and the broader 0.5-100 GHz range) using NYU WIRELESS measurements at 6.75, 16.95, 28, and 73 GHz. It derives FI parameters at 6.75/16.95 GHz and ABG parameters for the 7-24 GHz and 0.5-100 GHz bands, comparing them to the TR 38.901 equations: and . The results show close agreement between measured data and the TR model (key parameters within small tolerances) and confirm the model’s validity for Indoor Hotspot propagation in the tested bands, while highlighting sensitivity of ABG parameters to frequency sampling and the need for broader data across environments. Overall, the study informs 6G standardization by validating the TR 38.901 InH model and outlining directions for more robust ABG/FI tuning and broader validation across frequencies and environments.

Abstract

This paper presents a thorough validation of the Third Generation Partnership Project (3GPP) Technical Report (TR) 38.901 indoor hotspot (InH) path loss model, as part of the 3GPP Release 19 study on "Channel model validation of TR 38.901 for 7-24 GHz," for 6G standardization. Specifically, we validate the 3GPP TR 38.901 path loss model for the InH scenario in both line of sight (LOS) and non line of sight (NLOS) channel conditions, using the floating intercept (FI) and alpha-beta-gamma (ABG) path loss models. The validation focuses on specific frequencies, including 6.75 GHz and 16.95 GHz, as well as the broader 7-24 GHz and 0.5-100 GHz frequency ranges. The validation is based on real-world measurements conducted at 6.75 GHz, 16.95 GHz, 28 GHz, and 73 GHz by NYU WIRELESS using a 1 GHz wideband time domain based sliding correlation channel sounder in the InH scenario for both LOS and NLOS channel conditions. Our results confirm that the 3GPP TR 38.901 path loss model for the InH scenario remains valid for the 7-24 GHz range in both LOS and NLOS conditions and provide valuable input for 6G standardization efforts.

Paper Structure

This paper contains 8 sections, 4 equations, 3 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Overview of Measurement
  3. Large-scale path loss models
  4. FI Path Loss Models
  5. ABG Path Loss Models
  6. ABG Path Loss Model Parameters for 7-24 GHz
  7. ABG Path Loss Model Parameters for 0.5-100 GHz
  8. Conclusion

Figures (3)

  • Figure 1: InH FI path loss scatter plots and models in both LOS and NLOS channel conditions for measured data and 3GPP path loss model over a distance range of 1 m to 100 m for V-V polarization. The NLOS FI path loss model fit for 3GPP is shown for Option1 in \ref{['3gppInHNLos']}. Orange squares and green diamonds represent the measured LOS and NLOS omnidirectional path loss values.
  • Figure 2: InH ABG path loss scatter plots and models for measured data over a distance range of 1 m to 100 m for V-V polarization.
  • Figure 3: InH ABG path loss scatter plots and models for measured data over a distance range of 1 m to 100 m for V-V polarization.