Power Headroom Reporting for Multi-TRP PUSCH Repetition
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Solution Overview
Problem
Current power management solutions in wireless communication systems, such as LTE and 5G NR, lack a standardized procedure for user equipment (UE) to report power headroom to a base station, particularly in scenarios involving multiple transmit and receive points (TRPs) and multi-panel schemes.
Innovation Solution
A user equipment (UE) processor determines the appropriate transmission control indicator (TCI) state and configured maximum transmission power to accurately transmit power headroom reports (PHRs) based on real PUSCH transmissions, even in multi-panel and multi-TRP configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standardized power headroom reporting procedure is implemented across all UEs, then power management efficiency is improved, but device complexity increases due to multi-panel and multi-TRP configuration requirements
Solution Approach 1:
The patent applies local quality by making the PHR reporting behavior specific to local configuration conditions. The UE determines whether to report based on local configuration parameters (multi-panel capability, multi-TRP configuration, PUSCH repetition settings) and local transmission state (whether real PUSCH transmission occurs). This allows the system to maintain standardized reporting procedures while adapting to different device capabilities and network configurations through localized decision-making at the UE level.
2Measurement precision
If power headroom reports are transmitted for all PUSCH transmissions in multi-TRP configurations, then measurement precision is improved, but loss of information increases due to ambiguous TCI state associations
Solution Approach 1:
The patent applies inversion by reversing the conventional approach: instead of always reporting PHR for all PUSCH transmissions, the system inverts the logic to report only when specific conditions are met (when the PHR MAC CE slot does not coincide with real PUSCH transmission, or when TCI state association is unambiguous). This inverted approach prevents information loss by avoiding reports that would be ambiguous, while still maintaining measurement precision for valid reports.
3Adaptability or versatility
If multiple TCI states are supported for PUSCH transmissions, then adaptability is improved, but device complexity increases due to multiple configured maximum transmission powers
Solution Approach 1:
The patent applies dynamics by making the PHR reporting behavior dynamic rather than static. The UE dynamically determines whether to transmit PHR MAC CE based on the coincidence of timing slots between PHR transmission and real PUSCH transmission. This dynamic approach allows the system to adapt to varying transmission conditions without requiring complex static configurations for multiple TCI states, thereby supporting multi-TRP adaptability while managing device complexity through runtime decision-making.
Data Source
AI summary
A power headroom report (PHR) procedure is described for a user equipment (UE) in a wireless system. A UE can determine that i) a first MAC entity is not configured with a mode providing two PHRs or ii) the first MAC entity is configured with the mode and a first serving cell to which the first MAC entity belongs is configured with multiple TRP physical uplink shared channel (PUSCH) repetition. The UE determines whether there is at least one real PUSCH transmission at a slot where a PHR MAC CE element is transmitted, determines whether a first TCI state is associated with the at least one real PUSCH transmission, obtain a configured maximum transmission power associated with the first TCI state and transmit, via the first MAC entity, the PHR MAC CE based on at least the obtained configured maximum transmission power associated with the first TCI.