NTN Transmission Timing Using Collision Ambiguity Periods
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Solution Overview
Problem
In non-terrestrial networks, uplink and downlink transmissions between a terminal device and a network device experience resource collisions due to time advance mismatches, leading to communication performance issues and resource wastage.
Innovation Solution
Determine a collision ambiguity period based on relative motion information between the network device and the terminal device to avoid collisions by cancelling uplink or downlink transmissions during specific intervals, optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed time advance value is used for uplink transmission timing, then the transmission timing is simple to manage, but resource collisions occur between uplink and downlink due to satellite motion
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed time advance value to a dynamic collision ambiguity period that adapts to satellite motion. The collision ambiguity period is determined based on relative motion information between the network device and terminal device, allowing the system to adjust transmission timing parameters dynamically to prevent resource collisions while maintaining manageable complexity.
2Reliability
If the collision ambiguity period is extended to ensure collision avoidance, then resource collision probability decreases, but resource wastage increases due to cancelled transmissions
Solution Approach 1:
The patent applies parameter changes by optimizing the collision ambiguity period length based on relative motion information. Instead of using a fixed extended period, the system dynamically adjusts the period parameter to match the actual satellite motion characteristics, thereby minimizing resource wastage while maintaining adequate collision avoidance probability.
3Reliability
If uplink transmission is cancelled during the collision ambiguity period, then downlink reception quality is improved, but uplink throughput decreases
Solution Approach 1:
The patent applies partial action by implementing collision avoidance only during the optimized collision ambiguity period rather than continuously. This partial cancellation approach balances downlink reception quality improvement with uplink throughput maintenance, avoiding excessive resource wastage while still protecting downlink signals during critical collision-prone intervals.
Data Source
AI summary
A method for wireless communications includes: determining, by a terminal device based on relative motion information between a network device and the terminal device, a collision ambiguity period for uplink transmission, where the collision ambiguity period is configured as a period of cancelling the uplink transmission. Alternatively, the method includes: determining, by a network device based on relative motion information between the network device and a terminal device, a collision ambiguity period for downlink reception, where the collision ambiguity period is configured as a period of cancelling the downlink reception. The collision ambiguity period for uplink transmission is determined based on the relative motion information between the network device and the terminal device, thereby preventing substantial resource wastage while avoiding collisions between uplink transmission and downlink reception.