Multi-Purpose Reference Signal for V2X Sidelink
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Solution Overview
Problem
The existing LTE V2X technology faces challenges in efficiently managing reference signals for resource occupancy sensing, Automatic Gain Control (AGC), frequency offset estimation, and channel estimation due to fixed symbol durations and high overhead, which becomes even more complex with the introduction of 5G NR and unicasting communication modes.
Innovation Solution
A reference signal transmission method that allows for the achievement of multiple functions such as resource occupancy sensing, AGC, frequency offset estimation, channel state information measurement, and channel estimation through a single Multi-Purpose Reference Signal (MP-RS), which has a flexible duration and subcarrier spacing, thereby reducing system design complexity and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate signals are introduced to meet NR V2X unicasting requirements (resource occupancy sensing, frequency offset estimation, channel measurement), then the functionality and reliability are improved, but the system design complexity and signaling overhead increase
Solution Approach 1:
The patent applies multi-functionality by designing a single reference signal that can serve multiple purposes: resource occupancy sensing, frequency offset estimation, channel measurement, and channel estimation. This eliminates the need for multiple separate signals while maintaining all required functionalities for NR V2X unicasting communication.
Solution Approach 2:
The patent merges multiple separate reference signals into a single unified reference signal structure. By combining the functions of resource occupancy sensing, frequency offset estimation, and channel measurement into one signal, the system reduces design complexity and signaling overhead while preserving all necessary communication capabilities.
2Adaptability or versatility
If multiple separate signals are introduced to meet NR V2X unicasting requirements, then the functionality is improved, but the signaling overhead increases
Solution Approach 1:
The patent implements universality by creating a reference signal that performs multiple functions simultaneously - resource occupancy sensing, frequency offset estimation, channel measurement, and channel estimation - thereby supporting NR V2X unicasting communication without requiring multiple separate signals, thus reducing signaling overhead.
Solution Approach 2:
The patent combines multiple reference signal functions into a single signal structure, reducing the quantity of signaling overhead while maintaining adaptability for unicasting communication. The unified reference signal replaces what would otherwise require multiple separate signals.
3Ease of manufacture
If fixed symbol duration is used for AGC or GP, then the implementation simplicity is improved, but the adaptability to different scenarios is worsened
Solution Approach 1:
The patent applies dynamics by making the reference signal duration flexible rather than fixed. The reference signal can adapt its duration based on different scenarios and requirements, allowing the system to maintain implementation simplicity while achieving scenario adaptability through dynamic configuration.
Solution Approach 2:
The patent changes the parameter of reference signal duration from fixed to variable. By allowing the duration parameter to be adjusted based on different scenarios (such as different subcarrier spacings or communication requirements), the system achieves both implementation simplicity and scenario adaptability.
Data Source
AI summary
A reference signal transmission method and a reference signal transmission device are provided. The reference signal transmission method for a V2X system includes: receiving, by a first device, a first reference signal transmitted by another device via a sidelink; and performing, in accordance with the first reference signal transmitted by the other device, at least two of: a resource occupancy sensing process, an Automatic Gain Control (AGC) process, a Frequency Offset Estimation (FOE) process, a Channel State Information (CSI) measurement process, and a channel estimation process.