Downlink Repetition Scheduling for NTN Coverage Enhancement
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Solution Overview
Problem
The coverage of downlink transmission in non-terrestrial network (NTN) communication systems is insufficient due to limited satellite link budget, necessitating coverage enhancement to improve system performance.
Innovation Solution
A communication method where a terminal device receives indication information from a network device to determine the repetition count and/or the number of time units for downlink transmission, allowing for multiple reception occasions and increased transmission duration, thereby enhancing downlink coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If downlink transmission uses a single time unit, then transmission time is reduced, but downlink coverage is insufficient
Solution Approach 1:
The patent implements repeated downlink transmissions within a periodicity, where the network device transmits the same downlink data multiple times across different time units. The terminal device receives and combines these repeated transmissions, improving coverage reliability while managing transmission time through structured periodic repetition patterns.
2Reliability
If downlink transmission repeats in next periodicity only, then transmission resources are saved, but coverage enhancement is limited
Solution Approach 1:
The patent performs preliminary repeated transmissions within the same periodicity before moving to the next periodicity. By arranging multiple reception occasions within one periodicity, the system prepares sufficient transmission opportunities in advance, reducing the need to wait for next periodicity and thereby decreasing access time loss while enhancing coverage.
3Productivity
If downlink transmission occupies only one time unit, then resource efficiency is high, but bit transmission capacity is limited
Solution Approach 1:
The patent extends transmission from a single time unit into multiple time units within one periodicity, adding a temporal dimension to the transmission structure. This allows the system to increase bit transmission capacity by distributing data across multiple time slots while maintaining resource efficiency through structured resource allocation and repetition patterns.
Data Source
AI summary
This application provides a communication method. In an example of the method, a terminal device receives indication information from a network device, where the indication information indicates a quantity of time units occupied by one time of downlink transmission and/or a repetition count of the downlink transmission in one periodicity; and the terminal device receives the downlink transmission from the network device based on the indication information.