Sidelink Reference Signal Allocation in V2X Terminals
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Solution Overview
Problem
In vehicle-to-everything (V2X) communication systems, there is a challenge in efficiently transmitting sidelink reference signals to improve throughput, particularly in non-orthogonal multiple access technologies like Sparse Code Multiple Access (SCMA) and Low Density Signature (LDS) systems.
Innovation Solution
A sidelink communication method where a terminal device receives sidelink control information (SCI) to obtain information about sidelink reference signals, using various indication methods such as resource indication fields, scrambling code sequences, or predefined formats to determine the time-frequency resources for sidelink reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals are transmitted on sidelink to improve throughput, then channel measurement capability is improved, but the complexity of signal transmission and resource allocation increases
Solution Approach 1:
The patent segments the reference signal transmission into distinct components: physical sidelink control channel (PSCCH) for control information and physical sidelink shared channel (PSSCH) for data and reference signals. This segmentation allows independent optimization of control and data transmission, improving throughput while managing complexity through structured resource allocation.
Solution Approach 2:
The patent employs preliminary actions by transmitting reference signals before actual data communication to enable channel measurement and quality assessment. This allows the receiving terminal to evaluate channel conditions and provide feedback, enabling adaptive transmission parameters that improve throughput without requiring complex real-time signal processing.
2Measurement precision
If multiple reference signals are transmitted simultaneously to enhance channel measurement, then measurement precision is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by transmitting different reference signals (first reference signal on PSCCH, second reference signal on PSSCH) with different characteristics suited to their specific functions. The first reference signal is optimized for control channel measurement while the second is optimized for data channel measurement, allowing precise channel characterization without requiring all signals to have identical properties, thus simplifying resource allocation.
Solution Approach 2:
The patent achieves universality by designing the sidelink reference signal mechanism to serve multiple functions: channel measurement, quality assessment, and throughput improvement. The same reference signal transmission framework supports both control channel and data channel measurements, eliminating the need for separate dedicated reference signals for each function and reducing overall resource allocation complexity.
3Productivity
If channel measurement is performed based on reference signals to select transmission parameters, then transmission efficiency is improved, but the time required for measurement and feedback increases
Solution Approach 1:
The patent implements continuity of useful action by integrating reference signal transmission into the continuous sidelink communication process. Reference signals are transmitted periodically and continuously on both PSCCH and PSSCH, allowing the receiving terminal to perform channel measurement without interrupting the data transmission flow. This continuous measurement approach improves transmission efficiency while minimizing time loss compared to periodic or one-time measurement methods.
Data Source
AI summary
Disclosed in embodiments of the present disclosure are a sidelink communication method and a terminal device. The method includes a first terminal device receives sidelink control information (SCI) transmitted from a second terminal device; and the first terminal device obtains information of a sidelink reference signal according to the SCI.