Sidelink Timer Adaptation for NTN Transmission Delay
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Solution Overview
Problem
In non-terrestrial networks (NTN), the mismatch between the sidelink discontinuous reception (SL-DRX) mechanism and the large transmission delay causes communication failures between terminal devices and network devices.
Innovation Solution
The method involves determining timers for sidelink communication that align with the transmission delay in NTN, improving the matching between SL-DRX mechanisms and transmission delays, and using indication information to adjust communication parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SL-DRX mechanism uses default timer durations, then the mechanism can operate with simple configuration, but the timer duration does not match the large transmission delay in NTN, causing communication failures
Solution Approach 1:
The patent makes the timer duration dynamic by associating it with the transmission delay parameter. The terminal device determines the first timer duration based on the actual transmission delay in NTN, allowing the timer to adapt to varying delay conditions rather than using a fixed default value. This dynamic adjustment resolves the contradiction by maintaining communication reliability across different delay scenarios without requiring complex manual configuration for each case.
Solution Approach 2:
The patent changes the parameter of timer duration from a fixed default value to a variable that depends on the transmission delay parameter. By establishing a relationship between the first timer duration and the transmission delay, the system automatically adjusts the timer parameter to match the actual network conditions, thereby improving communication success rate without increasing configuration complexity.
2Reliability
If the timer duration is extended to accommodate large transmission delay, then communication reliability improves, but the timer duration becomes excessively long for normal conditions, reducing efficiency
Solution Approach 1:
The patent applies parameter changes by making the timer duration variable rather than fixed. The first timer duration is determined based on the actual transmission delay parameter, allowing the system to use shorter timers when delay is small and longer timers when delay is large. This resolves the contradiction by avoiding excessively long timers in normal conditions while ensuring sufficient duration when needed for NTN communication.
3Reliability
If the SL-DRX mechanism is enhanced for NTN, then communication reliability in NTN improves, but the mechanism becomes more complex and less compatible with existing protocols
Solution Approach 1:
The patent introduces dynamics into the SL-DRX mechanism by making the timer duration adaptable to NTN conditions through association with the transmission delay parameter. This allows the existing SL-DRX framework to be enhanced for NTN without fundamentally redesigning the mechanism, maintaining compatibility while improving reliability through parameter adaptation rather than structural complexity.
Solution Approach 2:
The patent enhances the SL-DRX mechanism for NTN by changing the timer duration parameter from a fixed value to one that is determined based on the transmission delay. This parameter change allows the existing mechanism to work effectively in NTN without requiring complex structural modifications, thereby improving reliability while minimizing increases in mechanism complexity.
Data Source
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AI summary
Provided are a sidelink communication method, a terminal device, and a network device. The method comprises: a first terminal device determines a first timer for sidelink communication, a first duration of the first timer being associated with a transmission delay of a non-terrestrial network (NTN) where the first terminal device is located. The first duration is associated with the transmission delay of the NTN, so that the matching degree between a duration of the first timer and the transmission delay of the NTN can be improved, or the matching degree between a duration of a timer in an SL-DRX mechanism and the transmission delay of the NTN can be improved, thereby improving the success rate of communication between a first terminal device and a network device under the NTN.