Multi-TRP Uplink Power Control via Segmented SRI Fields
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing power control for multi-TRP uplink transmission, particularly in accurately determining and applying transmit power for Physical Uplink Shared Channels (PUSCH) across multiple Transmission/Reception Points (TRPs) in 5G networks, which affects data throughput and reliability.
Innovation Solution
The proposed solution involves a method where User Equipment (UE) receives configuration for multiple sets of power control information, using Downlink Control Information (DCI) with distinct Sounding Reference Signal Resource Indicators (SRI) fields to determine specific power control IDs, enabling precise transmit power derivation for PUSCH transmission across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single SRI field is used for power control indication, then the device complexity is reduced, but the measurement precision of power control information is insufficient for multi-TRP transmission
Solution Approach 1:
The DCI structure is segmented into multiple SRI fields (first SRI field and second SRI field) with different sizes, where each field corresponds to different power control information sets. This segmentation allows precise indication of power control parameters for multiple TRPs while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent introduces an additional dimension by using fields of different sizes (first SRI field larger than second SRI field) to encode power control information. This dimensional approach enables more granular power control indication for multi-TRP scenarios without linearly increasing overall complexity.
2Reliability
If separate power control information sets are used for each TRP, then the reliability of multi-TRP transmission is improved, but the device complexity increases due to multiple SRI fields
Solution Approach 1:
Different portions of the DCI structure are assigned different qualities - the first SRI field (larger size) provides more granular power control information for certain TRPs, while the second SRI field (smaller size) provides streamlined information for other TRPs. This local differentiation optimizes reliability where needed while controlling overall complexity.
3Manufacturing precision
If larger SRI field size is used, then the manufacturing precision of power control parameter indication is improved, but the loss of information in control signaling increases
Solution Approach 1:
The patent changes the parameter of SRI field size dynamically - using a larger first SRI field when precise power control is needed for certain TRPs, and a smaller second SRI field for other TRPs where less precision is required. This parameter variation optimizes the balance between indication precision and signaling overhead.
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a User Equipment (UE) in a wireless communication system. The method can include receiving a configuration for a first set of power control information and a second set of power control information, receiving a Downlink Control Information (DCI) scheduling one or more Physical Uplink Shared Channels (PUSCHs), wherein the DCI comprises a first Sounding Reference Signal Resource Indicator (SRI) field and a second SRI field, determining a first Identifier (ID) directly based on value indicated by the first SRI field, wherein the first ID is a power control information ID in the first set of power control information, determining a second ID based on a value indicated by the second SRI field and the number of layers, and transmitting the one or more PUSCHs based on transmit power derived from the power control information of the first ID or the power control information of the second ID.