Multi-TRP Power Headroom Reporting for PUSCH Retransmission
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Solution Overview
Problem
Existing wireless communication systems struggle to effectively manage power headroom reports (PHRs) in scenarios involving multiple transmission reception points (TRPs), particularly in carrier aggregation (CA) and dual connectivity (DC), leading to inefficiencies in scheduling and uplink transmission power control.
Innovation Solution
A method for performing power headroom reports (PHRs) considering multiple TRPs, involving operations such as identifying PHR triggering conditions, obtaining and transmitting power headrooms for activated serving cells, and configuring cell groups to enable PHRs for multiple TRPs, along with corresponding base station operations to receive and determine PHR configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power headroom reports are performed for multiple TRPs in carrier aggregation and dual connectivity scenarios, then uplink transmission quality and scheduling accuracy are improved, but system complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the power headroom reporting process by introducing separate reporting mechanisms for different TRP scenarios. It divides the reporting into single-TRP reports and multi-TRP reports, with each having specific triggering conditions and reporting formats. This segmentation allows the system to handle multiple TRPs without requiring complete redesign of the existing single-TRP reporting framework, thus improving reliability while managing complexity.
Solution Approach 2:
The patent implements dynamic reporting behavior where the UE adapts its PHR reporting based on current transmission conditions. The reporting is triggered dynamically based on whether single-TRP or multi-TRP PUSCH repetition is being performed, and the report content changes accordingly. This dynamic approach ensures accurate power headroom information is provided when needed without continuously increasing system complexity.
2Measurement precision
If separate power headroom reporting for single-TRP and multi-TRP PUSCH repetition is implemented, then scheduling accuracy is improved, but signaling overhead and processing burden increase
Solution Approach 1:
The patent applies local quality by providing different reporting characteristics for different TRP scenarios. For single-TRP PUSCH repetition, one reporting format is used, while for multi-TRP PUSCH repetition, a different reporting format with additional TRP-specific power headroom information is used. This localized differentiation ensures scheduling accuracy for each scenario without requiring the same level of detailed reporting in all cases, thus reducing overall signaling overhead.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The method of UE comprises: receiving RRC message comprising cell group configuration information for configuring a first cell group and a second cell group; determining whether a PHR triggering condition is satisfied; determining whether multiple TRPs-based PUSCH repetition related to a serving cell is configured for an arbitrary activated serving cell included in the first cell group and the second cell group, and whether a serving cell group to which the activated serving cell belongs is configured to enable the PHR for the multiple TRPs; obtaining two pieces of power headroom related to the arbitrary activated serving cell; and transmitting a PHR MAC CE comprising the two pieces of power headroom related to the arbitrary activated serving cell to the base station.