Power Control for Simultaneous PUSCH to Multiple TRPs
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Solution Overview
Problem
Current communication systems, particularly in 5G New Radio (NR), face challenges in efficiently managing power headroom reports (PHRs) in multi-TRP operations, which affect resource allocation and power control, leading to suboptimal performance in wireless communication systems.
Innovation Solution
A method where a User Equipment (UE) determines and transmits two power headroom reports (PHRs) within a MAC control element (MAC CE) for a physical uplink shared channel (PUSCH), allowing for accurate power headroom reporting across multiple transmission/reception points (TRPs), enabling better resource allocation and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE transmits separate PHR for each TRP independently, then the power headroom information for each TRP can be reported accurately, but the signaling overhead and resource allocation complexity increase
Solution Approach 1:
The patent combines multiple Power Headroom Reports (PHRs) for different Transmission/Reception Points (TRPs) into a single MAC Control Element (MAC CE). This merging approach allows the UE to report power headroom information for multiple TRPs simultaneously in one transmission, reducing signaling overhead and simplifying resource allocation while maintaining accurate per-TRP power headroom reporting.
2Productivity
If the UE includes multiple PHRs in a single MAC CE, then the signaling overhead is reduced and resource allocation is simplified, but the MAC CE structure becomes more complex
Solution Approach 1:
The patent segments the MAC CE into distinct fields, each carrying PHR information for a specific TRP. This segmentation allows the MAC CE to efficiently accommodate multiple PHRs with clear structure and organization, improving reporting efficiency while managing the complexity through systematic field division rather than monolithic structure.
3Productivity
If the base station receives detailed per-TRP power headroom information, then resource allocation decisions can be optimized for each TRP, but the processing and management overhead at the base station increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports power headroom information for multiple TRPs in an organized MAC CE structure, enabling the base station to receive comprehensive per-TRP power status information efficiently. This feedback allows the base station to make optimized resource allocation decisions for each TRP based on actual power headroom conditions without excessive processing overhead, as the information is structured and ready for direct utilization.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines to send a first power headroom report (PHR) and a second PHR. The UE receives a resource allocation for a physical uplink shared channel (PUSCH). The UE includes the first PHR and the second PHR in a MAC control element (MAC CE). The UE transmits the PUSCH including the MAC CE.