PTRS Configuration via Implicit Signaling for 5G Overhead Reduction
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Solution Overview
Problem
Current 5G communication systems face challenges with high resource overheads and inflexibility in reference signal configuration, particularly due to fixed time and frequency domain densities, which are not adaptable to varying phase noise levels and mobility speeds.
Innovation Solution
The proposed solution involves a method to configure reference signals by implicitly indicating their time-frequency location based on the modulation and coding scheme, bandwidth, and subcarrier spacing, thereby reducing explicit signaling overheads and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed time domain density and frequency domain density are used for reference signals, then configuration is simple, but adaptability to different phase noise levels and mobility speeds is poor
Solution Approach 1:
The patent applies dynamics by making the reference signal configuration adaptive rather than fixed. The time domain density and frequency domain density are dynamically adjusted based on channel conditions, phase noise levels, and mobility speeds. This allows the system to optimize reference signal overhead for different scenarios while maintaining configuration simplicity through automated adaptation.
Solution Approach 2:
The patent changes the parameters of reference signal configuration (time domain density, frequency domain density, resource element positions) based on detected channel conditions. By modifying these parameters dynamically, the system achieves adaptability to different phase noise levels and mobility speeds without requiring complex manual configuration for each scenario.
2Quantity of substance
If explicit signaling is used to indicate reference signal time-frequency location, then configuration flexibility is high, but signaling overhead increases
Solution Approach 1:
The patent extracts the reference signal time-frequency location indication from explicit signaling and derives it implicitly from existing uplink scheduling information. This removes the need for separate explicit signaling while maintaining the ability to indicate different time-frequency locations based on scheduling decisions, thus reducing overhead while preserving flexibility.
Solution Approach 2:
The patent uses uplink scheduling information as an intermediary to convey reference signal configuration. Instead of direct explicit signaling, the scheduling information serves as a mediator that implicitly indicates the reference signal time-frequency location, achieving both overhead reduction and configuration flexibility through this indirect mechanism.
3Measurement precision
If reference signal density is increased to improve phase noise estimation accuracy, then estimation precision improves, but resource overhead increases
Solution Approach 1:
The patent applies local quality by adjusting reference signal density locally according to specific channel conditions rather than using uniform high density everywhere. In scenarios with high phase noise or mobility, higher local density improves estimation accuracy, while in better conditions, lower density reduces overhead. This localized adaptation optimizes the balance between precision and resource consumption.
Data Source
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AI summary
Embodiments of the present invention provide a reference signal configuration method, an apparatus, and a system. The method includes: mapping a phase tracking reference signal (PTRS) to one or more OFDM symbols based on information about a correspondence between the PTRS and one or more of a modulation and coding scheme (MCS), a subcarrier spacing (SC), and a bandwidth (BW); and sending the one or more OFDM symbols to which the PTRS is mapped to a receive device. In the embodiments of the present invention, a correspondence between the PTRS and the subcarrier spacing or the modulation and coding scheme or the bandwidth is used to implicitly indicate a time-frequency location of the PTRS. In comparison with the prior art, no explicit indication is required, and signaling overheads are reduced.