RIS-Aware Transmission Power Control for UE Communication Links
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Solution Overview
Problem
In wireless communications systems with reconfigurable intelligent surfaces (RIS), user equipment (UE) faces challenges in determining appropriate transmission power controls due to the presence of RISs affecting communication characteristics like pathloss, especially when RISs are proximal to the UE.
Innovation Solution
The UE calculates transmission power based on a selected power control configuration from a set of configurations, considering the communication state, which is determined by the communication link, presence of RISs, and whether RISs assist the UE or another UE, receiving power control configurations from a network entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional transmission power control methods are used without RIS awareness, then the power control mechanism remains simple, but the UE cannot accurately manage interference and communication quality when RISs are present
Solution Approach 1:
The patent segments the power control configurations into multiple distinct types (first power control configuration for direct Uu link, second power control configuration for RIS-assisted Uu link, third power control configuration for sidelink). Each configuration is associated with specific communication scenarios and RIS presence conditions, allowing the UE to select the appropriate configuration based on current communication state without requiring a completely complex unified system.
Solution Approach 2:
The patent implements dynamic power control configuration selection where the UE transitions between different power control configurations based on real-time detection of RIS presence and communication link requirements. The UE monitors whether RISs are present within proximity and whether they are assisting the transmission, then dynamically switches between configured power control modes to optimize communication quality while managing complexity.
2Productivity
If the UE monitors RIS presence and communication state to select appropriate power control configurations, then transmission power can be optimized for each scenario, but the UE processing complexity increases
Solution Approach 1:
The network entity provides the UE with multiple pre-configured power control configurations before the actual transmission occurs. Each configuration is pre-associated with specific communication scenarios (direct link, RIS-assisted uplink, sidelink) and RIS presence conditions. The UE simply needs to monitor current conditions and select the pre-configured option that matches, avoiding the need for complex real-time power calculation algorithms.
Solution Approach 2:
The system implements feedback mechanisms where the UE reports communication state information including RIS presence detection and assistance status to the network entity. This feedback enables the network to provide appropriate power control configurations and allows the UE to verify whether selected configurations are being applied correctly, simplifying the UE's processing by using feedback-driven configuration selection rather than autonomous complex optimization.
3Adaptability or versatility
If multiple power control configurations are provided for different communication scenarios, then the system adapts to RIS presence and communication state, but the control message and configuration management become more complex
Solution Approach 1:
The patent applies local quality by associating different power control configurations with specific local communication scenarios and RIS presence conditions. Each configuration is tailored to specific local conditions (e.g., RIS assisting first UE, RIS assisting second UE, direct link) rather than using a uniform configuration for all cases. This allows fine-grained adaptation to local communication states while managing complexity through scenario-specific configuration association.
Solution Approach 2:
The patent implements universality by designing a unified power control configuration framework that handles multiple communication scenarios (Uu link, sidelink, RIS-assisted, RIS-non-assisted) within a single system architecture. The network entity provides a comprehensive set of configurations that can be applied across different scenarios, and the UE uses a consistent selection process based on communication state, reducing overall system complexity while maintaining versatility.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein may enable transmission power control (TPC) for user equipments (UEs) supporting reconfigurable intelligent surfaces (RISs). For example, a first UE may receive a control message indicating multiple parameter sets associated with calculating a transmission power for a transmission. Each parameter set may be associated with a communication link, a presence of one or more RISs, and whether the one or more RISs are assisting the first UE or a second UE. The UE may transmit signaling in accordance with a calculated transmission power based on selecting a first parameter set from the multiple parameter sets, where the first parameter set is selected based on a communication link associated with the transmission, a presence of one or more RISs during the transmission, and whether the one or more RISs are assisting the first UE or the second UE.