Uplink Power Control via Base Station Configured Downlink Reference Signals
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Solution Overview
Problem
Current wireless communication systems face challenges in uplink power control, particularly in next-generation systems that lack cell-specific reference signals for pathloss estimation, leading to inefficiencies in transmission power determination and ambiguity in selecting downlink reference signals for uplink channel transmission.
Innovation Solution
A method for uplink power control that involves receiving a downlink reference signal, measuring path-loss using this signal, and determining transmission power for the uplink channel based on configuration information indicated by the base station, which can include specific downlink reference signals configured through Radio Resource Control (RRC) signaling, allowing for efficient power management and ambiguity reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell-specific reference signals are used for pathloss estimation in LTE system, then pathloss measurement is standardized and reliable, but the system cannot support next-generation requirements for flexible beam management and multi-TRP operations
Solution Approach 1:
The patent makes downlink reference signals (such as CSI-RS and SS/PBCH blocks) serve dual purposes: they function as beam management reference signals and simultaneously serve as pathloss estimation references for uplink power control. This eliminates the need for separate cell-specific reference signals while enabling both beam management flexibility and reliable pathloss measurement in next-generation systems.
2Productivity
If downlink reference signals are configured for pathloss estimation, then uplink power control can be performed, but ambiguity arises in selecting which downlink reference signal to use when multiple are available
Solution Approach 1:
The patent implements a feedback mechanism where the base station provides explicit configuration information to the user equipment indicating which specific downlink reference signal should be used for pathloss estimation. This configuration can be delivered through RRC signaling or MAC CE, ensuring the UE has clear guidance on reference signal selection without ambiguity.
Solution Approach 2:
The patent introduces configuration information as an intermediary that mediates between the multiple downlink reference signals and the pathloss estimation process. This configuration information acts as a selector or pointer that clearly identifies which reference signal should be used, eliminating selection ambiguity while maintaining the flexibility to use different reference signals for different purposes.
3Measurement precision
If base station provides configuration information through RRC signaling, then reference signal selection is precise and unambiguous, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent applies preliminary action by configuring downlink reference signals for pathloss estimation purposes in advance through RRC signaling or MAC CE before actual uplink transmission occurs. This pre-configuration approach ensures that when uplink power control is needed, the UE already has clear guidance on which reference signal to use, avoiding real-time decision complexity.
Data Source
AI summary
A method for uplink (UL) power control of a User Equipment (UE) in a wireless communication system according to one embodiment of the present invention comprises receiving a Downlink (DL) Reference Signal (RS); measuring DL path-loss by using the DL RS; determining transmission power for an UL channel by using the measured path-loss; and transmitting the UL channel, wherein the DL RS used for determining the transmission power for the UL channel is determined based on configuration information indicated by a base station.