PTRS Resource Mapping Across Service-Specific Subcarriers
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Solution Overview
Problem
The existing PTRS resource allocation methods in vehicle-mounted short-range wireless communication systems are not applicable, leading to poor channel estimation reliability due to the lack of PTRS resources for each noise reduction service, which is critical for low delay and high reliability requirements.
Innovation Solution
A method and apparatus that specify the time and frequency domain locations of reference signals to ensure each service has sufficient resources for channel phase tracking, using a flexible configuration of subcarriers and symbols based on predefined or configured integers, adapting to different channel conditions and modulation schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Wi-Fi PTRS resource allocation method is used, then the resource allocation is simple and standardized, but it cannot ensure that PTRS resources are configured for each noise reduction service in the vehicle-mounted short-range wireless communication system
Solution Approach 1:
The patent applies local quality by configuring PTRS resources specifically for each noise reduction service's allocated subcarriers rather than using a universal Wi-Fi approach. The PTRS subcarrier index is locally adapted to match the service's frequency domain resources, ensuring reliable channel estimation tailored to each service's specific resource allocation pattern.
Solution Approach 2:
The patent changes the parameter of PTRS resource configuration from the fixed Wi-Fi protocol specification to a dynamic configuration that adapts to the service-specific resource allocation. The PTRS subcarrier index parameter is modified to be derived from the service's allocated subcarriers, transforming the rigid parameter into a flexible one that ensures reliability for each service.
2Reliability
If PTRS resources are allocated for every service, then channel phase tracking reliability improves, but system complexity and resource overhead increase
Solution Approach 1:
The patent applies self-service by enabling each noise reduction service to automatically obtain its own PTRS resources based on its allocated subcarriers. The PTRS resource configuration is derived from the service's own resource allocation parameters, allowing the system to self-organize reliable channel tracking without external intervention or complex centralized management.
Solution Approach 2:
The patent achieves universality by using a unified PTRS resource allocation formula that works for all noise reduction services regardless of their specific resource allocations. The same mathematical relationship (PTRS subcarrier index derived from allocated subcarriers) serves all services, simplifying the overall system while ensuring each service has dedicated PTRS resources.
3Measurement precision
If more reference signal resources are allocated, then channel estimation precision improves, but available resources for other services decrease
Solution Approach 1:
The patent applies partial action by allocating PTRS resources only where needed - specifically on the subcarriers allocated to each noise reduction service. Rather than over-provisioning reference signals across the entire bandwidth, the system provides precise channel estimation resources exactly where the service data is transmitted, optimizing the balance between precision and resource efficiency.
Data Source
AI summary
Example reference signal transmission methods and apparatus are described. One example method includes that 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.