RIS Downlink Configuration Conflict Detection for UE Beam Recovery
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Solution Overview
Problem
In wireless communications systems, UEs face challenges in determining whether a transmission configuration state is properly configured for direct or indirect communication with a base station using reconfigurable intelligent surfaces (RIS), leading to potential beam failure and high power consumption due to misalignment between configured and actual communication paths.
Innovation Solution
A UE receives a configuration for a transmission configuration state indicating a quasi-co-location source associated with transmission via a reconfigurable intelligent surface (RIS) and determines conflicts, allowing it to adjust its communication path accordingly, either through RIS-assisted or non-RIS-assisted links, and communicates this to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses RIS-assisted communication with a configured transmission configuration state, then communication reliability is improved, but power consumption increases due to misalignment between configured and actual communication paths
Solution Approach 1:
The UE monitors the actual communication path and compares it with the configured transmission configuration state. When a mismatch is detected (e.g., the quasi-co-location source is not actually transmitted via RIS), the UE provides feedback to the base station by transmitting an indication message. This feedback mechanism enables dynamic adjustment of the configuration to match actual conditions, resolving the contradiction between maintaining reliable RIS-assisted communication and avoiding unnecessary power consumption from misaligned configurations.
2Productivity
If the UE monitors and detects conflicts between transmission configuration state and quasi-co-location source, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The UE autonomously performs monitoring of the actual communication path and self-detects conflicts between the configured transmission configuration state and the actual quasi-co-location source. The UE also self-generates and transmits indication messages to the base station without requiring complex external control systems. This self-service approach improves communication efficiency through rapid conflict detection while keeping device complexity manageable by leveraging existing UE capabilities.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration for a transmission configuration state for receiving downlink channel transmissions from a base station via a configurable surface. The transmission configuration state may indicate a quasi-co-location source associated with transmission via the configurable surface. The UE may receive a downlink channel transmission via the configurable surface based on the transmission configuration state and the quasi-co-location source. The UE may be capable of determining whether the transmission configuration state conflicts with the quasi-co-location source indicated by the transmission configuration state. The UE may transmit an indication to the base station that the configuration for the transmission configuration state conflicts with the quasi-co-location source. The indication may include a beam failure indication or a measurement report. The UE may fall back to a transmission configuration state previously activated at the UE.