Reference Signal Transmission Method Reducing Resource Overhead
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Solution Overview
Problem
In communications systems using MIMO technology, the high overhead of resources occupied by reference signals due to the need for frequent configuration of reference signals in each OFDM symbol to compensate for phase noise, especially in systems with multiple ports, leads to inefficient service data transmission.
Innovation Solution
A method where the transmitting device configures reference signals based on specific configuration information that includes the location of a first time symbol and subcarriers within a bandwidth range, allowing for efficient resource allocation by reducing the number of reference signals required, thereby improving data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are configured in each OFDM symbol to compensate for phase noise, then phase noise compensation accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent segments the reference signal configuration by port group, where reference signals are configured only for the first port group (ports 0-3) rather than all ports. This segmentation allows phase noise compensation for the most critical ports while reducing overall resource overhead by excluding reference signals for less critical port groups.
Solution Approach 2:
The patent applies local quality by providing different reference signal configurations for different port groups. The first port group receives full reference signal coverage in each OFDM symbol for accurate phase noise compensation, while the second port group operates with reduced reference signal overhead, optimizing resources based on local port requirements.
2Measurement precision
If reference signals are configured for each port, then channel parameter estimation accuracy is improved, but resource overhead becomes unacceptably high
Solution Approach 1:
The patent divides ports into two groups: a first port group (ports 0-3) that receives reference signals in each OFDM symbol for accurate channel estimation, and a second port group that operates with reduced reference signal overhead. This segmentation resolves the contradiction by providing high estimation accuracy only where needed.
Solution Approach 2:
The patent applies partial action by providing reference signals for only the first port group rather than all ports. This partial coverage is sufficient to achieve acceptable channel parameter estimation accuracy while dramatically reducing resource overhead, especially in systems with many ports.
3Productivity
If reference signal overhead is reduced, then service data transmission efficiency is improved, but phase noise tracking capability deteriorates
Solution Approach 1:
The patent segments phase noise compensation resources by port group, ensuring that the first port group maintains full phase noise tracking capability through reference signals in each OFDM symbol, while the second port group accepts reduced tracking capability in exchange for improved overall service data transmission efficiency.
Solution Approach 2:
The patent changes the parameter of reference signal configuration from universal (all ports) to selective (first port group only). This parameter change optimizes the balance between phase noise tracking capability and service data transmission efficiency by adjusting reference signal density according to port group priorities.
Data Source
AI summary
This application provides a reference signal transmission method and an apparatus, to resolve a prior-art problem of relatively high overheads of resources occupied by transmitted reference signals in a communications system. The method includes: configuring, by a transmitting device, one reference signal group corresponding to one port in the first time symbol, and configuring one reference signal corresponding to the port in each of time symbols except the first time symbol. This reduces overheads of resources occupied by transmitted reference signals in the communications system and improves service data transmission efficiency while ensuring that a receiving device can obtain a channel parameter of the port.