RIS TCI State Control for Dynamic Interference Management
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing interference effectively using reconfigurable intelligent surfaces (RISs), particularly in determining optimal operation modes to enhance signal reception and mitigate interference.
Innovation Solution
A device receives a physical downlink shared channel transmission using multiple TCI states, performs reference signal measurements, determines interference levels, and adjusts RIS modes based on these measurements to activate or deactivate specific TCI states for improved signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If RIS operates in reflection mode to enhance signal reception, then signal quality is improved, but interference level increases
Solution Approach 1:
The RIS dynamically switches between reflection mode and absorption mode based on real-time interference level measurements. When interference exceeds a threshold, the system transitions from reflection to absorption mode, and vice versa, optimizing the balance between signal enhancement and interference mitigation
Solution Approach 2:
The system changes the operational parameter of the RIS by switching between different modes (reflection/absorption) depending on the measured interference level. This parameter change allows the RIS to adapt its behavior to minimize harmful interference while maintaining signal quality
2Adaptability or versatility
If multiple TCI states are configured for RIS operation modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The TCI state management is segmented into distinct sets: first TCI states associated with base station operations and second TCI states associated with RIS operation modes. This segmentation allows independent management and simplifies the activation/deactivation process for each mode
Solution Approach 2:
The system uses feedback from reference signal measurements to determine interference levels, which then triggers appropriate TCI state activations or deactivations. This feedback mechanism automates the complexity management by making decisions based on measured conditions rather than manual configuration
3Object-generated harmful factors
If RIS absorbs interference to reduce interference level, then interference is mitigated, but signal reception is weakened
Solution Approach 1:
The RIS dynamically switches between reflection mode (for signal enhancement) and absorption mode (for interference mitigation) based on real-time conditions. This dynamic adaptation allows the system to optimize between signal reception and interference reduction depending on the operational context
Data Source
AI summary
Control information and transmission configuration indicator (TCI) are provided for reconfigurable intelligent surfaces (RISs). A wireless transmit/receive unit (WTRU) may receive a first physical downlink shared channel (PDSCH) transmission using a first TCI state associated with a base station and using a second TCI state associated with a first RIS mode. The WTRU may perform a reference signal measurement associated with an RIS. The WTRU may determine an interference level based on the reference signal measurement. The WTRU may determine a second RIS mode based on the interference level. The WTRU may send a message to the base station, wherein the message indicates the second RIS mode. The WTRU may receive an indication of a third RIS mode associated with a third TCI state associated with the base station. The WTRU may receive a second PDSCH transmission using the third TCI state.