RIS Phase Continuity for DMRS Bundling Across Reconfiguration
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Solution Overview
Problem
Wireless communications systems face challenges in maintaining phase continuity when reconfigurable intelligent surfaces (RISs) change configurations or transmission parameters, affecting the ability of receiving devices to perform demodulation reference signal (DMRS) bundling and joint processing across transmissions.
Innovation Solution
RISs are designed to maintain phase continuity by indicating their capability to switch back to an original configuration within a threshold time, allowing devices to perform DMRS bundling and joint processing by adhering to reported conditions and timing offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RIS changes configuration or transmission parameters between transmissions, then the adaptability of the RIS is improved, but phase continuity is broken affecting DMRS bundling and joint processing
Solution Approach 1:
The RIS performs preliminary actions by switching back to an original configuration within a threshold time before transmissions occur, ensuring phase continuity is maintained. The capability indication mechanism allows the RIS to proactively inform wireless devices about its ability to maintain phase continuity, enabling them to perform DMRS bundling and joint processing.
Solution Approach 2:
The RIS dynamically adjusts its configuration switching behavior based on timing conditions. It can switch between different configurations but must return to the original configuration within a specified threshold time to maintain phase continuity. This dynamic time-based control allows the RIS to balance adaptability with phase continuity requirements.
2Reliability
If the RIS maintains the same configuration across transmissions, then phase continuity is maintained enabling DMRS bundling, but the adaptability and responsiveness of the RIS to changing channel conditions is reduced
Solution Approach 1:
The RIS employs periodic action by switching back to the original configuration at specific time intervals (within the threshold time) to maintain phase continuity. This periodic return to the original configuration ensures that phase continuity is restored before transmissions, while allowing intermediate configuration changes for adaptability.
Solution Approach 2:
The RIS changes its operational parameters (configuration switching behavior) based on the timing relationship between transmissions. It adjusts whether to switch configurations or maintain the original configuration based on whether the time interval falls within the threshold, thereby dynamically controlling phase continuity while maintaining adaptability.
3Speed
If the RIS switches between different configurations quickly, then the responsiveness to channel changes is improved, but the ability to maintain phase continuity within threshold time is compromised
Solution Approach 1:
The RIS performs preliminary switching actions to return to the original configuration within the threshold time before transmissions occur. This preliminary action ensures that even though the RIS can switch configurations quickly, it proactively restores phase continuity in time for the actual transmissions.
Solution Approach 2:
The capability indication mechanism provides feedback to wireless devices about the RIS's ability to maintain phase continuity. This feedback allows receiving devices to determine whether to perform DMRS bundling and joint processing based on the reported capability, creating a closed-loop system that adapts to the RIS's actual performance.
4Reliability
If the RIS maintains phase continuity capability indication, then the reliability of DMRS bundling is improved, but the device complexity increases due to capability reporting and condition monitoring
Solution Approach 1:
The RIS performs self-service by autonomously monitoring its own configuration switching behavior and determining whether it can maintain phase continuity within the threshold time. It then independently provides capability indications to wireless devices, eliminating the need for external entities to monitor and report this information.
Solution Approach 2:
The capability indication mechanism creates a feedback loop where the RIS reports its phase continuity capability to wireless devices, which then use this information to determine whether to perform DMRS bundling and joint processing. This feedback mechanism ensures that reliability is improved while keeping the complexity manageable through standardized reporting.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A reconfigurable intelligent surface (RIS) may indicate an ability to maintain phase continuity across transmissions. The RIS may transmit a capability information message and receive control signaling indicating one or more conditions under which the RIS may maintain phase continuity. For example, the RIS may maintain phase continuity when the separation time between consecutive transmissions may be long enough for the RIS to change to an original configuration or original set of transmission parameters. In other cases, the RIS may maintain phase continuity when the same configuration or set of transmission parameters are used between consecutive transmissions, and the time between the transmissions does not exceed a threshold. The RIS may relay signals based on the one or more conditions.