Multi-TRP Power Headroom Reporting for 5G Beam Failure Prevention
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in accurately reporting power headroom across multiple Transmission/Reception Points (TRPs), leading to inefficient power control and potential beam failure events, especially in high-speed vehicular scenarios and dense deployment environments.
Innovation Solution
The implementation of a method for User Equipment (UE) to generate a multi-TRP Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element, which distinguishes and reports power headroom levels for each TRP, enabling precise power control and reducing beam failure occurrences by calculating Type 1 and Type 2 power headroom based on actual and reference PUSCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single Power Headroom Reporting (PHR) mechanism is used for multiple TRPs, then the reporting structure is simple, but power control accuracy deteriorates
Solution Approach 1:
The patent segments the PHR mechanism by introducing separate Type 1 PH and Type 2 PH reporting structures. Type 1 PH reports power headroom for actual PUSCH transmissions on specific TRPs, while Type 2 PH reports power headroom for reference PUSCH transmissions across multiple TRPs. This segmentation allows the system to maintain simple reporting procedures while achieving accurate per-TRP power control through dedicated measurement types.
2Measurement precision
If per-TRP power headroom reporting is implemented, then power control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic PHR reporting where the UE selectively reports Type 1 or Type 2 PH based on actual transmission conditions. When actual PUSCH transmissions occur on specific TRPs, Type 1 PH is reported for those TRPs. When only reference transmissions are configured, Type 2 PH is reported. This dynamic approach adapts the reporting complexity to actual network conditions, providing per-TRP accuracy only when needed.
Solution Approach 2:
The patent applies local quality by differentiating reporting granularity at the TRP level. For TRPs with active PUSCH transmissions, detailed Type 1 PH reporting is used. For TRPs without active transmissions or where reference-based reporting suffices, Type 2 PH is used. This localized differentiation optimizes power control accuracy for each TRP based on its specific operational context rather than applying a uniform reporting mechanism across all TRPs.
3Stability of the object's composition
If reference PUSCH transmission reporting is used for all TRPs, then reporting consistency is improved, but power control reliability deteriorates
Solution Approach 1:
The patent uses preliminary action by configuring reference PUSCH transmissions in advance for TRPs where actual transmissions may occur later. Type 2 PH reporting based on these pre-configured reference transmissions provides consistent reporting structure. When actual PUSCH transmissions do occur, Type 1 PH reporting provides reliable, transmission-specific power headroom measurements. This combination ensures both consistency through pre-configured references and reliability through actual transmission measurements.
Data Source
AI summary
A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives an uplink (UL) grant. The UL grant is indicative of a first Physical Uplink Shared Channel (PUSCH) transmission on a first Transmission/Reception Point (TRP) of a first cell. The UL grant is not indicative of a PUSCH transmission on a second TRP of the first cell. The UE transmits a Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element (CE). Based on the UL grant, the PHR MAC CE is indicative of a first power headroom (PH), associated with the first TRP, based on a real PUSCH transmission, and is indicative of a second PH, associated with the second TRP, based on a reference PUSCH transmission.