Multi-TRP Power Headroom Reporting via Unified MAC Control Element
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power headroom reports (PHRs) in scenarios with multiple transmission reception points (TRPs), leading to suboptimal resource allocation and potential interference due to varying transmission powers across different TRPs.
Innovation Solution
A method and apparatus are developed to enable user equipment (UE) to generate and transmit a medium access control (MAC) control element (CE) for multiple TRPs, allowing the base station (BS) to obtain and manage power headroom (PH) for each TRP, facilitating improved scheduling and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PHR mechanism is used for multiple TRPs, then the system complexity is reduced, but the power management precision and scheduling accuracy deteriorate
Solution Approach 1:
The patent segments the PHR mechanism by introducing separate PHR fields for each TRP (first PHR for first TRP, second PHR for second TRP). This allows independent power headroom measurement and reporting for each TRP, improving measurement precision while maintaining manageable system complexity through structured segmentation.
2Measurement precision
If separate PHR reporting is implemented for each TRP, then the power management accuracy is improved, but the signaling overhead and message length increase
Solution Approach 1:
The patent merges multiple PHR reports for different TRPs into a single MAC CE message. The MAC CE includes multiple PHR fields (first PHR, second PHR) and corresponding TRP indication fields, allowing simultaneous reporting of power headroom for multiple TRPs in one transmission, thereby reducing signaling overhead compared to separate messages.
Solution Approach 2:
The MAC CE structure is designed with universal applicability for multiple TRPs. The message includes TRP indication fields that can identify different TRPs, and PHR fields that can report power headroom for any configured TRP, making the same message structure adaptable to varying numbers of TRPs without requiring separate specialized messages.
3Productivity
If power headroom is aggregated across multiple TRPs, then the scheduling efficiency is improved, but the interference management capability deteriorates
Solution Approach 1:
The patent applies local quality by providing separate PHR values for each TRP, allowing the base station to understand the specific power headroom condition at each TRP location. This enables differentiated scheduling and interference management decisions for each TRP based on its local power conditions, rather than treating all TRPs uniformly.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal is provided, the method including receiving, from a base station, a radio resource control (RRC) message including information associated with a power headroom report (PHR) of multiple transmission and reception points (TRPs), in case that a PHR is triggered, obtaining a first power headroom (PH) of a first TRP and a second PH of a second TRP, generating a medium access control (MAC) control element (CE) for the multiple TRPs including the first PH of the first TRP and the second PH of the second TRP, and transmitting, to the base station, the MAC CE for the multiple TRPs.