Multi-TRP PUCCH Power Control Using Separate P0 and PL-RS Sets
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Solution Overview
Problem
Existing wireless communication systems in NR Release-15 support only single TRP DL transmission, lacking enhancements for multiple TRPs, which necessitate improved power control mechanisms for PUCCH transmissions to multiple TRPs to ensure reliable and robust uplink communications.
Innovation Solution
Implementing a power control mechanism that includes configuring multiple P0 values and PL-RSs for PUCCH transmissions, using DCI format 2_2 with TPC-PUCCH-RNTI, to enable separate power control for each TRP, with PUCCH groups and CORESET groups associated with specific power control parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs DL MIMO transmission is implemented, then reliability and robustness are improved, but device complexity increases due to need for multiple power control parameter sets
Solution Approach 1:
The patent segments the power control parameters by creating separate parameter sets for different TRPs. Each TRP has its own P0 values and PL-RS configurations, allowing independent power control optimization for each transmission point while maintaining overall system reliability
Solution Approach 2:
The patent introduces a new dimension to power control by adding TRP-specific parameter sets. Instead of a single power control mechanism, the system now operates in multiple dimensions with separate P0-sets and PL-RS-sets indexed by TRP identifier, enabling sophisticated multi-TRP coordination
2Measurement precision
If separate power control for each TRP is implemented, then power control precision is improved, but device complexity increases due to multiple P0 values and PL-RSs
Solution Approach 1:
The patent applies local quality by configuring power control parameters specifically tailored to each TRP's characteristics. Each TRP receives customized P0 values and PL-RS configurations based on its specific propagation conditions, antenna characteristics, and coverage requirements, achieving precise local optimization
Solution Approach 2:
The patent changes parameters by introducing multiple P0 values (P0-sets) and multiple PL-RS configurations (PL-RS-sets) that can be selectively applied based on the active TRP. The system dynamically adjusts power control parameters according to TRP-specific conditions, enabling precise power adaptation
3Adaptability or versatility
If multiple PUCCH transmissions are supported for multiple TRPs, then adaptability is improved, but device complexity increases due to enhanced power control requirements
Solution Approach 1:
The patent achieves universality by creating a generalized power control framework that can handle multiple TRPs, multiple PUCCH transmissions, and various transmission scenarios. The same mechanism with indexed parameter sets serves multiple functions including single-TRP operation, multi-TRP coordination, and dynamic TRP selection
Data Source
AI summary
Methods, a remote unit and abase unit are disclosed. According to one embodiment, a method at abase unit, comprising: transmitting, to a remote unit, multiple power control parameters for physical uplink control channel (PUCCH) by higher layers signaling; and transmitting, to the remote unit, a transmit power control (TPC) command with downlink control information (DCI) format 2_2 scrambled by transmit power control-physical uplink control channel-radio network temporary identity (TPC-PUCCH-RNTI), wherein the power control parameters include more than 8 P0 values and more than 4 pathloss reference signals (PL-RSs).