Reference Signal Mapping for Reliable Channel Phase Tracking
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Solution Overview
Problem
The existing resource allocation methods for PTRS in vehicle-mounted short-range wireless communication systems fail to ensure that each service has a PTRS resource for channel phase tracking, leading to poor channel estimation reliability due to mismatched frequency and time domain resource allocations compared to Wi-Fi and NR technologies.
Innovation Solution
A method and apparatus that specify the time and frequency domain locations of reference signals for each service, allowing flexible configuration of reference signal resources to meet low delay and high reliability requirements, including mapping to specific subcarriers and symbols within the transmission resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Wi-Fi PTRS resource configuration method is used, then the resource allocation is simple and standardized, but it cannot ensure that each service has a PTRS resource for channel phase tracking in vehicle-mounted short-range wireless communication systems
Solution Approach 1:
The patent applies local quality by configuring PTRS resources specifically for each service's frequency domain resources rather than using a universal configuration. The PTRS frequency domain resources are locally adapted to match each service's data frequency domain allocation, ensuring that each service has appropriate PTRS resources for accurate channel phase tracking while maintaining system-wide coordination through the base station's centralized management.
2Measurement precision
If PTRS resources are allocated for every service, then channel estimation precision is improved, but resource overhead and system complexity increase
Solution Approach 1:
The patent implements universality by using a unified PTRS resource configuration approach that serves multiple services simultaneously. The base station configures PTRS resources that can be applied across different services with similar characteristics, reducing redundant configuration overhead while ensuring each service receives appropriate PTRS resources for accurate channel estimation.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting PTRS frequency domain resource parameters based on service requirements and channel conditions. The configuration parameters such as frequency domain spacing and resource allocation patterns are adaptively modified to optimize the balance between channel estimation precision and resource overhead for different service types and transmission scenarios.
Data Source
AI summary
This application discloses a reference signal transmission method and apparatus, and may be applied to the field of autonomous driving, intelligent driving, or short-range communications. The method includes: A first node maps a reference signal to a first transmission resource and sends the reference signal. The first transmission resource is included in a second transmission resource used by the first node to send data, and the second transmission resource includes a first symbol and at least one subcarrier corresponding to the first symbol. The first transmission resource includes at least one of an Mth subcarrier or an Nth-to-last subcarrier in the at least one subcarrier corresponding to the first symbol, and M and N are preset, specified in a protocol, or configured. The reference signal is used to determine phase information of a channel.