Multi-Panel PHR Reporting for Accurate NR Power Control
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Solution Overview
Problem
In the New Radio (NR) system, existing PHR reporting methods fail to accurately reflect the actual transmit power headroom of terminals with multiple antenna panels, leading to incorrect power control adjustments by the network due to the inability to distinguish between power backoffs from individual panels.
Innovation Solution
A PHR reporting method that includes multiple power headroom and maximum power fields for each target transmission or parameter, allowing for precise power headroom reporting and power backoff value reporting through MAC CE or UCI, enabling accurate power control adjustments by the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PH value is calculated based on the maximum power limit of the terminal, then the reporting format is simple, but it cannot reflect the actual transmit power headroom of each panel in multi-panel transmission
Solution Approach 1:
The patent segments the power headroom reporting into multiple PH values, where each PH value corresponds to a specific panel or target transmission. This segmentation allows the network to obtain accurate power headroom information for each panel while maintaining a structured reporting format that can be systematically processed.
Solution Approach 2:
The patent introduces a new dimension to the reporting format by adding panel-specific identifiers (such as SRS resource set ID, TCI state, or CORESETPoolIndex) alongside each PH value. This dimensional expansion transforms the reporting from a single aggregate value to a multi-dimensional dataset that captures both power headroom and panel identification.
2Ease of operation
If power control is performed based on a single PH value, then the control mechanism is simple, but the network cannot correctly adjust power control parameters for multi-panel transmissions
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports multiple PH values along with their corresponding panel identifiers. The network uses this feedback to determine which panels require power adjustments and makes targeted power control decisions for each panel, improving the reliability of power control in multi-panel scenarios.
Solution Approach 2:
The patent changes the parameters being reported from a single power headroom value to multiple parameters including PH values, panel identifiers, and associations with power control parameters. This parameter expansion enables the network to make more informed and accurate power control adjustments for each panel.
3Measurement precision
If multiple PH values are reported with their corresponding panel identifiers, then the power headroom information is accurate, but the reporting format and processing complexity increase
Solution Approach 1:
The patent creates a universal reporting structure that can handle both single-panel and multi-panel scenarios. The same reporting format with multiple PH values and identifiers works whether the UE has one panel or multiple panels, making the solution broadly applicable without requiring format changes.
Solution Approach 2:
The patent introduces dynamic elements to the reporting format, where the number of PH values and their associations with power control parameters can vary based on the actual transmission scenario. This dynamic structure allows the reporting to adapt to different numbers of panels and transmission configurations.
Data Source
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AI summary
The present disclosure provides a PHR reporting method, a power backoff value reporting method and device, and UE. The method includes: reporting, by UE, a PHR; where the PHR includes: N1 power headroom (PH) fields, and N2 maximum power (Pcmax) field(s), N1 is an integer greater than or equal to 2, and N2 is an integer greater than or equal to 1. Each PH field is used to indicate a power headroom of corresponding target transmission; the N2 Pcmax fields are used to indicate maximum transmission powers corresponding to different target transmissions or different first parameters.