Power Control for Multiple TRPs Using Pathloss Reference Linking
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing bandwidth and resource allocation across multiple technologies and releases, particularly in heterogeneous networks with a mix of old and new technology devices.
Innovation Solution
The implementation of advanced bandwidth management techniques, including the use of bandwidth parts (BWPs) and carrier aggregation, along with dynamic configuration of control resource sets and power control mechanisms based on pathloss reference linking, to optimize resource utilization and adapt to varying traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission reception points are used to improve network coverage and capacity, then data rates and reliability are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent segments the uplink power control process by introducing separate pathloss reference signals for different transmission reception points (TRPs). Each TRP has its own pathloss reference signal (e.g., CSI-RS or SSB) that the UE measures independently, allowing separate power control adjustments for each TRP. This segmentation enables the system to handle multiple TRPs without requiring complete redesign of the power control mechanism.
Solution Approach 2:
The patent adds a new dimension to power control by introducing pathloss reference linking across multiple TRPs. Instead of single-dimension power control for a single TRP, the system now operates in multiple dimensions by establishing relationships between pathloss references of different TRPs. This allows the UE to determine uplink transmit power for each TRP based on measurements of pathloss reference signals from multiple TRPs, effectively adding spatial dimensionality to the power control process.
2Measurement precision
If pathloss reference linking is configured for multiple transmission reception points, then power allocation accuracy is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring pathloss reference linking relationships between multiple TRPs through higher-layer signaling (RRC or MAC CE). These configurations are established before actual data transmission, so that when uplink transmission occurs, the UE already has the necessary pathloss reference associations to calculate accurate transmit power. This preliminary configuration avoids the need for real-time signaling during data transmission.
Solution Approach 2:
The patent uses copying by reusing existing pathloss reference signal structures (CSI-RS or SSB) for multiple TRPs. Instead of creating entirely new reference signal types for multi-TRP operations, the system copies and adapts existing pathloss reference mechanisms, establishing relationships between these copied references and uplink channels for different TRPs. This approach leverages existing standardized structures rather than introducing completely new signaling elements.
Data Source
AI summary
A wireless device receives configuration parameters comprising pathloss reference linking indicators for SRS resource sets of a first cell associated with one or more TRPs, wherein each SRS resource set of the SRS resource sets comprises SRS resources, and each SRS resource set is associated with a respective pathloss reference linking indicator of the pathloss reference linking indicators, indicating a cell index identifying a pathloss reference cell. The wireless device transmits, via SRS resources of a first SRS resource set of the SRS resource sets in the first cell, SRSs with a transmission power determined based on a first pathloss RS of a first pathloss reference cell, wherein the first pathloss reference cell is indicated by a first pathloss reference linking indicator, of the pathloss reference linking indicators, associated with the first SRS resource set.