Multi-Panel Power Headroom Reporting in 5G Uplink
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Solution Overview
Problem
The existing power headroom reporting (PHR) methods in 5G wireless communication systems, particularly in multi-panel scenarios, are inefficient as they are designed for single-panel cases and do not effectively handle the complexities introduced by the introduction of multiple panels, leading to increased overhead and reduced spectral efficiency.
Innovation Solution
A method that involves receiving and transmitting information sets indicating reference signal resource sets, with the target signal comprising power differences associated with these sets, allowing for the determination of power headroom reports based on the characteristics of the Physical Uplink Shared Channel (PUSCH) and the use of overlapping sub-signals in the time-frequency domain to optimize power control reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing Power Headroom Reports (PHRs) designed for single-Panel case are used in multi-Panel scenarios, then the reporting structure remains simple, but the overhead increases and spectral efficiency decreases
Solution Approach 1:
The patent segments the PHR reporting by introducing separate power headroom indicators for each panel (first PHR for first panel, second PHR for second panel). Each PHR is associated with specific reference signal resource sets, allowing independent power control reporting for each panel while maintaining overall system efficiency
Solution Approach 2:
The patent adds a new dimension to PHR reporting by introducing panel-specific reporting mechanisms. Instead of a single unified PHR, the system now reports power headroom across multiple dimensions (panels, reference signal resource sets), enabling more granular power control without excessive overhead
2Reliability
If multiple panels are configured for simultaneous transmission, then spatial diversity gain is improved, but power control complexity increases
Solution Approach 1:
The patent applies local quality by configuring different power control parameters for different panels and their associated reference signal resource sets. Each panel can have its own pathloss reference signals, power offsets, and PHR reporting configurations, allowing optimized power control tailored to each panel's specific channel conditions and transmission requirements
Solution Approach 2:
The patent introduces dynamic power control mechanisms where the UE can selectively activate or deactivate panels based on channel conditions, and dynamically adjust power headroom reporting frequency and content for each panel. The network can dynamically configure which panels report PHR and under what conditions, adapting to changing spatial diversity requirements
3Measurement precision
If pathloss measurement is performed using CSI-RS and SSB in 5G NR, then uplink power control accuracy is improved, but measurement and reporting overhead increases
Solution Approach 1:
The patent makes reference signal resource sets universal by allowing the same reference signal resources to serve multiple purposes: downlink channel quality measurement, uplink power control pathloss estimation, and PHR triggering. This multi-functionality reduces the need for dedicated measurement resources while maintaining measurement precision
Solution Approach 2:
The patent merges the pathloss measurement function with existing downlink reference signals (CSI-RS and SSB) that are already configured for other purposes. By combining multiple functions into existing signal structures, the system avoids additional overhead while achieving accurate pathloss measurement for power control
Data Source
AI summary
The node firstly receives a first information set, the first information set indicating a first reference signal resource set and a second reference signal resource set; and then transmits a target signal, the target signal comprising a second information set; the second information set comprises a first power difference, or comprises a second power difference and a third power difference; the first power difference is associated with the first reference signal resource set or the second reference signal resource set; the second power difference and the third power difference are respectively associated with the first reference signal resource set and the second reference signal resource set; the target signal is used to determine whether the second information set comprises the first power difference or comprises both the second power difference and the third power difference. This application improves uplink power control for multi-panel terminals to increase system flexibility.