Open-loop Power Control for Multi-TRP Uplink PUSCH
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Solution Overview
Problem
Current power control methods for uplink PUSCH in multi-TRP scenarios are inefficient, leading to wasted transmission power and increased interference due to the lack of precise power boosting control, especially when URLLC and eMBB services conflict, as terminals cannot determine the specific TRPs causing interference without SRI indication.
Innovation Solution
An open-loop power control method is introduced, where a network device sends indication information for open-loop power boosting values specific to each TRP, allowing terminals to configure and determine corresponding power control parameters for each TRP direction, optimizing power boosting even in the absence of SRI indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP cooperation is used to improve coverage and service quality, then transmission reliability is improved, but power control precision deteriorates due to lack of TRP-specific power boosting control
Solution Approach 1:
The patent segments the power control parameters by TRP, introducing separate open-loop power boosting parameters (P0-NR) for each TRP. This allows independent power control for each transmission reception point, enabling precise power allocation to different TRPs while maintaining overall transmission reliability through multi-TRP cooperation.
Solution Approach 2:
The patent applies local quality by configuring power control parameters specifically for each TRP based on local channel conditions. The network device can assign different P0-NR values to different TRPs, allowing each TRP to operate with optimized power levels tailored to its specific propagation environment and service requirements.
2Area of stationary object
If open-loop power boosting is applied to all TRPs, then transmission coverage is improved, but transmission power is wasted due to inability to differentiate TRP-specific interference conditions
Solution Approach 1:
The patent enables differentiated power control by configuring distinct open-loop power boosting parameters for each TRP. The network device can assess local interference conditions and channel quality for each TRP, then assign appropriate P0-NR values, ensuring power is allocated efficiently based on local requirements rather than applying uniform boosting across all TRPs.
Solution Approach 2:
The patent changes the power control parameters dynamically by introducing TRP-specific P0-NR parameters that can be independently adjusted. This allows the system to modify power levels for individual TRPs based on changing channel conditions, interference levels, and service requirements, optimizing both coverage and energy efficiency.
3Measurement precision
If SRI indication field is used to identify interfering TRPs, then power control accuracy is improved, but signaling overhead increases due to additional indication fields
Solution Approach 1:
The patent segments the power control indication by integrating TRP identification directly into the power control parameter configuration rather than using separate SRI indication fields. Each TRP's power control parameters are configured independently, allowing the terminal to determine the interfering TRP through the parameter set index without requiring additional signaling overhead for explicit TRP identification.
4Reliability
If multi-TRP cooperation is deployed to reduce handover latency, then service continuity is improved, but power allocation complexity increases due to multiple TRP power control parameters
Solution Approach 1:
The patent applies universality by using a unified power control framework that handles both single-TRP and multi-TRP scenarios through the same mechanism. The terminal uses the same power control calculation formula and parameter interpretation methods regardless of whether one or multiple TRPs are involved, simplifying the overall system complexity while supporting service continuity through multi-TRP cooperation.
Data Source
AI summary
An open-loop power control (OLPC) method for an uplink physical uplink shared channel (PUSCH) is performed by a network device. The method includes: sending first indication information, wherein the first indication information indicates an open-loop power boosting value used when the PUSCH is sent based on multi-transmission reception point (multi-TRP) cooperation, and the open-loop power boosting value used when the PUSCH is sent corresponds to different cooperative TRPs to which the PUSCH is sent; and in response to an absence of a sounding reference signal (SRS) resource indication (SRI) indication field in the first indication information, configuring and determining an OLPC parameter of one or more transmission reception points (TRPs) used by a terminal when the terminal sends the PUSCH to multiple TRPs in a cooperation manner, the OLPC parameter comprising a corresponding open-loop power boosting value.