Carrier Frequency Tracking with Multi-TRP Reference Signals
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Solution Overview
Problem
In single frequency network (SFN) scenarios, data transmission performance of user equipment (UE) is poor due to the reliance on a single tracking reference signal from multiple transmission reception points (TRPs), limiting accurate carrier frequency tracking.
Innovation Solution
The UE receives and processes multiple tracking reference signals from different time-frequency resources, allowing it to select an appropriate carrier frequency for tracking, and optionally performs pre-compensation based on signal quality and distance to improve data transmission accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple transmission reception points send the same tracking reference signal on the same time-frequency resource, then device complexity is reduced, but measurement precision of carrier frequency deteriorates
Solution Approach 1:
The patent segments the tracking reference signal transmission by assigning different time-frequency resources to different transmission reception points. Each TRP transmits TRS on dedicated resources, allowing the UE to separately process and evaluate signals from multiple TRPs, thereby improving carrier frequency tracking accuracy without significantly increasing overall system complexity
Solution Approach 2:
The patent introduces an additional dimension of resource differentiation by allocating tracking reference signals across multiple time-frequency resources. This dimensional separation enables the UE to perform more accurate measurements by selecting the best TRS from multiple candidates, resolving the contradiction between simplified transmission and precise measurement
2Device complexity
If the terminal device uses a single tracking reference signal for carrier frequency tracking, then processing complexity is reduced, but data transmission performance deteriorates
Solution Approach 1:
The patent implements a dynamic selection mechanism where the UE evaluates multiple tracking reference signals from different TRPs and selects the most appropriate one based on signal quality metrics. This dynamic approach optimizes data transmission performance by adapting to varying channel conditions while maintaining manageable processing complexity through structured selection criteria
3Measurement precision
If multiple transmission reception points transmit tracking reference signals on different time-frequency resources, then measurement precision of carrier frequency is improved, but device complexity increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the UE reports measurement results of multiple tracking reference signals to the network. This feedback enables the network to optimize TRS allocation and assists the UE in selecting the best TRS for carrier frequency tracking, improving measurement precision while managing complexity through coordinated decision-making
Solution Approach 2:
The patent employs preliminary evaluation of multiple tracking reference signals before final carrier frequency tracking. The UE assesses signal quality metrics in advance and pre-selects the optimal TRS, which simplifies the subsequent tracking process and reduces overall processing complexity while maintaining high measurement precision
Data Source
AI summary
A carrier frequency tracking method, a signal transmission method, and a related apparatus. The carrier frequency tracking method includes: a terminal device receives a first tracking reference signal from a first transmission reception apparatus of a single frequency network cell; the terminal device receives a second tracking reference signal from a second transmission reception apparatus of the single frequency network cell, where the first tracking reference signal and the second tracking reference signal occupy different time-frequency resources; and the terminal device performs carrier frequency tracking based on at least one of the first tracking reference signal and the second tracking reference signal.