Terminal Power Headroom Reporting for Multi-Panel Uplink Control
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Solution Overview
Problem
In future radio communication systems, the unclear reporting and calculation of Power Headroom (PHR) during multi-panel simultaneous uplink transmission lead to inappropriate transmission control, reducing communication throughput.
Innovation Solution
A terminal equipped with a receiving section for power configuration per panel or cell and a control section to manage both actual and independent PHRs based on single-panel transmission, enabling appropriate transmission power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-panel simultaneous UL transmission is supported to improve UL throughput, then communication throughput is improved, but PHR reporting and calculation becomes unclear leading to inappropriate transmission control
Solution Approach 1:
The patent segments the PHR reporting mechanism by introducing separate PHR fields for each panel (first PHR field for first panel, second PHR field for second panel). This segmentation allows independent power headroom calculation and reporting for each panel, resolving the ambiguity in multi-panel simultaneous transmission while maintaining improved UL throughput.
2Reliability
If multi-panel simultaneous UL transmission is supported, then UL reliability is improved, but device complexity increases due to multiple PHR management
Solution Approach 1:
The patent merges multiple PHR information into a single MAC CE (Medium Access Control Control Element) structure. By combining first PHR field, second PHR field, and necessary indicators into one unified PHR MAC CE, the patent reduces signaling overhead and management complexity while maintaining independent panel power control for improved reliability.
3Measurement precision
If separate PHR reporting per panel is implemented, then transmission power control accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent creates a universal PHR MAC CE structure that can handle both single-panel and multi-panel transmission scenarios. The same MAC CE format accommodates different numbers of panels through configurable fields (first PHR field, second PHR field, indicators), providing multi-functionality that reduces signaling overhead while maintaining precise power control accuracy.
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives a configuration of a restriction related to transmission power per panel or per cell, when uplink (UL) simultaneous transmission from multi-panel is supported; and a control section that controls, based on the configuration, transmission of at least one of a first power headroom report (PHR) based on actual physical uplink shared channel (PUSCH) transmission and a second PHR independent of actual PUSCH transmission. At least one of the first PHR and the second PHR is based on single-panel transmission. According to one aspect of the present disclosure, it is possible to appropriately perform transmission power control.