Uplink Power Headroom Reporting for Multi-TRP 5G Systems
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G, face challenges in effectively reporting uplink power headroom (PHR) across multiple transmission and reception points (TRPs), which affects the efficient utilization of resources and service provision in advanced communication scenarios.
Innovation Solution
A method and apparatus that determine whether a power headroom reporting (PHR) is triggered, identify relevant PH values for physical uplink shared channels (PUSCH) corresponding to specific resource indices, and transmit PHR medium access control control elements (MAC CE) via these channels, enabling effective communication between terminals and base stations across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power headroom reporting is performed in traditional single TRP systems, then reporting simplicity is maintained, but reporting accuracy and resource allocation efficiency deteriorate in multi-TRP scenarios
Solution Approach 1:
The patent segments the power headroom reporting by associating separate PH values with different TRPs (Transmission Reception Points). Each PH value is linked to a specific TRP through a TRP indicator, allowing the system to report power headroom information separately for each TRP. This segmentation enables accurate power reporting per TRP while maintaining a structured reporting format that manages complexity through organized information separation.
2Productivity
If multiple PH values are reported for multiple TRPs, then resource allocation efficiency improves, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent merges multiple PH values and their associated TRP indicators into a single PHR MAC CE (Medium Access Control Control Element) structure. Instead of transmitting separate reporting messages for each TRP, the system combines all power headroom information for multiple TRPs into one consolidated MAC CE, reducing the number of individual signaling transmissions while still providing detailed per-TRP power information for efficient resource allocation.
Solution Approach 2:
The PHR MAC CE structure is designed with multi-functionality to handle both single-TRP and multi-TRP scenarios. The same MAC CE format can accommodate one or multiple PH values depending on the configuration, with universal fields that can represent different TRPs. This universal structure reduces signaling overhead by using a single reporting mechanism for various TRP configurations rather than requiring separate specialized reporting formats.
3Reliability
If power headroom information is aggregated across multiple TRPs, then overall system performance improves, but loss of specific TRP power information occurs
Solution Approach 1:
The patent adds a new dimension to power headroom reporting by introducing TRP indicators that associate each PH value with a specific TRP identity. Instead of merely aggregating power values, the reporting structure includes dimensional information (TRP identifiers) that maintains the relationship between each PH value and its corresponding TRP. This dimensional enhancement allows the system to preserve specific TRP power information while still achieving overall system performance improvement through comprehensive multi-TRP power awareness.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment of the disclosure, a method performed by a terminal in a communication system includes determining whether a power headroom reporting (PHR) is triggered; identifying at least one of a first power headroom (PH) value for a first physical uplink shared channel (PUSCH) corresponding to a first resource index or a second PH value for a second PUSCH corresponding to a second resource index based on a determination that the PHR is triggered; identifying a PHR medium access control control element (MAC CE) related to at least one of the first PH value or the second PH value; and transmitting the PHR MAC CE via at least one of the first PUSCH or the second PUSCH.