Same-Time Sidelink CSI-RS Beams for Faster Beam Training
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Solution Overview
Problem
Existing beam management processes in wireless communication systems are inefficient for device-to-device scenarios like V2X communication, as existing SL CSI-RS cannot be effectively applied for SL beam management.
Innovation Solution
Sending multiple CSI-RSs using different beams within the same time unit, allowing for faster beam fine-tuning and improved SL beam management efficiency by increasing the number of training beams without increasing the number of beam sweeping times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CSI-RSs are sent using different beams within the same time unit, then beam training speed and SL beam management efficiency are improved, but beam management complexity increases
Solution Approach 1:
The patent segments the beam management process by dividing beam sweeping into multiple independent CSI-RS transmissions within the same time unit. Each CSI-RS carries information for a specific beam, allowing parallel measurement and comparison of multiple beams without sequential sweeping, thus improving training speed while managing complexity through structured segmentation
Solution Approach 2:
The patent introduces a new dimension to beam management by transmitting multiple CSI-RSs in the same time unit rather than sequentially in different time units. This temporal dimensionality change allows simultaneous beam measurements across multiple spatial directions, significantly accelerating beam training while the standardized measurement framework controls the associated complexity
2Adaptability or versatility
If the number of training beams is increased, then beam management coverage and accuracy are improved, but implementation complexity increases
Solution Approach 1:
The patent segments the increased number of training beams into multiple independent CSI-RS transmissions, where each CSI-RS corresponds to one or more specific beams. This segmentation allows the system to handle a larger total number of beams by distributing them across multiple structured transmission instances within the same time unit, improving coverage while maintaining manageable implementation complexity through standardized procedures
Solution Approach 2:
The patent creates a universal measurement framework where the same CSI-RS measurement and comparison procedures can be applied regardless of the number of beams. This multi-functionality allows the system to scale from a small number to a large number of training beams using the same fundamental process, improving adaptability and coverage without proportionally increasing implementation complexity
3Measurement precision
If beam fine-tuning is performed more frequently, then beam alignment accuracy is improved, but communication delay increases
Solution Approach 1:
The patent enables continuous beam fine-tuning by allowing multiple CSI-RS transmissions within the same time unit, creating a continuous measurement process rather than discrete periodic measurements. This continuity allows the system to perform frequent beam alignment checks and adjustments without introducing additional communication delays, as the measurements occur in parallel within the existing time framework
Solution Approach 2:
The patent performs preliminary beam measurements by transmitting multiple CSI-RSs before actual data transmission begins within the same time unit. This preliminary action allows the system to complete beam fine-tuning and alignment in advance, ensuring accurate beam selection is already established before communication starts, thereby eliminating delay between measurement and transmission
Data Source
AI summary
The present disclosure relates to communication methods, apparatuses, and systems. One example method includes sending first sidelink control information (SCI), where the first SCI indicates to send M channel state information reference signals (CSI-RSs), and M is a positive integer greater than or equal to 2, and sending the M CSI-RSs, where the M CSI-RSs belong to a same time unit, the M CSI-RSs include a first CSI-RS and a second CSI-RS, the first CSI-RS is sent by using a first beam, the second CSI-RS is sent by using a second beam, and the first beam and the second beam correspond to different spatial domain parameters.