Cross-Carrier Timing Alignment for Unsynchronized 5G Scheduling
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Solution Overview
Problem
Inaccurate timing occurs in cross-carrier scheduling scenarios where carriers are not synchronized, leading to inefficiencies in data transmission and feedback in 5G communication systems.
Innovation Solution
Determine a timing relationship between unsynchronized carriers to ensure accurate data transmission and feedback by adjusting the time domain positions based on time deviations between carriers, using indication information from the network device to align transmission and reception slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time deviation compensation is not performed in cross-carrier transmission, then the transmission system is simpler, but the received signal quality deteriorates due to time misalignment between carriers
Solution Approach 1:
The patent applies preliminary action by calculating and applying time deviation compensation before the actual signal transmission. The terminal device determines the time deviation between carriers and adjusts the second time domain position in advance, ensuring proper time alignment is established before data transmission occurs, thereby preventing time misalignment issues without adding complexity during transmission
Solution Approach 2:
The patent changes the time domain parameter by adjusting the second time domain position based on calculated time deviations. The system modifies temporal parameters (time deviation values) to achieve proper synchronization between first and second carriers, transforming the time alignment issue into a parameter adjustment problem that can be solved systematically
2Measurement precision
If time domain position is dynamically adjusted based on time deviation, then time alignment accuracy improves, but calculation complexity increases
Solution Approach 1:
The patent introduces time deviation as an intermediary parameter that mediates between the fixed time domain positions and the actual alignment requirements. By calculating time deviation values as intermediate steps and using these to determine adjusted time domain positions, the system achieves precise time alignment through a structured calculation approach rather than direct complex optimization
Data Source
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AI summary
Provided are a cross-carrier transmission method and apparatus, and a terminal device. The method comprises: a terminal device receiving a first channel on a first carrier and a first time domain position, and receiving or sending a second channel on a second carrier and a second time domain position, wherein the second time domain position is determined on the basis of at least one of the first time domain position, a first time deviation and a second time deviation, the first time deviation is the time deviation between the first carrier and the second carrier, and the second time deviation is the time deviation between a start time domain position of the first channel and a start time domain position of the second channel.