Sidelink Reference Signals for Reflective Device CSI Training
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Solution Overview
Problem
Current techniques for determining the channel state in sidelink communication involving reflective devices are inadequate, as they only support a single sidelink reference signal, which is insufficient for accurately determining transmission parameters and training the reflective device.
Innovation Solution
The use of two or more types of sidelink reference signals (SL-RSs) is proposed, one based on an active operational state of the reflective device and the other based on an inactive state, along with corresponding channel state information (CSI) reports for more accurate determination of transmission parameters and reflective device training.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sidelink reference signal is used in current techniques, then the system complexity is reduced, but the measurement precision and transmission parameter determination accuracy deteriorate
Solution Approach 1:
The patent segments the reference signal into two distinct types: first SL-RS for when the reflective device is active, and second SL-RS for when the reflective device is inactive. This segmentation allows each reference signal type to be optimized for its specific operational context, improving measurement precision without requiring a single complex universal reference signal structure.
Solution Approach 2:
The patent implements dynamic selection between first and second SL-RS based on the operational state of the reflective device. The system adapts which reference signal type is used according to whether the reflective device is currently active, allowing the reference signal structure to dynamically adjust to operational conditions rather than remaining static.
2Reliability
If multiple types of sidelink reference signals are implemented, then the transmission parameter determination accuracy improves, but the device complexity increases
Solution Approach 1:
The system dynamically selects between first and second SL-RS types based on the reflective device's operational state. This dynamic approach ensures that the appropriate reference signal is used for each communication scenario, improving reliability by matching the reference signal characteristics to the actual channel conditions while avoiding the need to maintain multiple simultaneously active reference signal structures.
Solution Approach 2:
The patent changes key parameters of the reference signal based on the operational state: the first SL-RS uses parameters optimized for reflective device active scenarios, while the second SL-RS uses parameters optimized for inactive scenarios. This parameter adaptation allows the system to maintain high reliability across different operational conditions without requiring a permanently complex multi-type reference signal structure.
3Reliability
If reflective device training is performed accurately, then the communication reliability improves, but the time required for training increases
Solution Approach 1:
The patent performs preliminary action by having the receiving UE measure and report channel state information for both first and second SL-RS types in advance. This allows the transmitting UE to have transmission parameters determined before actual data transmission begins, reducing the time required for adaptive adjustments during active communication while maintaining accurate reflective device training.
Solution Approach 2:
The system implements feedback mechanisms where the receiving UE measures the reference signals and reports channel state information back to the transmitting UE. This feedback loop enables accurate determination of transmission parameters and reflective device training without requiring extended training periods, as the feedback provides real-time channel conditions for rapid parameter optimization.
Data Source
AI summary
A first user equipment (UE) for wireless communication may be configured to send, to a second UE, a plurality of sidelink reference signals (SL-RSs), wherein the first UE and the second UE are configurable to communicate with a network entity, and wherein the plurality of SL-RSs includes a first SL-RS corresponding to a first operational state of the network entity. The first UE may receive, from the second UE, one or more channel state information (CSI) reports, wherein each CSI report of the one or more CSI reports corresponds to a respective SL-RS of the plurality of SL-RSs.