NTN Sidelink Timing Offset for Reliable PUCCH Alignment
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Solution Overview
Problem
Existing technologies do not provide effective solutions for enhancing the timing relationships between uplink and sidelink transmissions in non-terrestrial network (NTN) systems, particularly in scenarios where the terminal device is configured with SL resource allocation mode 1, leading to inefficiencies and reduced reliability of sidelink and physical uplink control channel transmissions.
Innovation Solution
The terminal device determines a starting time unit for sidelink (SL) and/or physical uplink control channel (PUCCH) transmissions based on a first offset and the moment of receiving a physical downlink control channel (PDCCH) indication, ensuring that the SL and PUCCH transmissions start from a time unit that is not earlier than a first moment, thereby aligning with network scheduling and improving transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses conventional timing relationships for SL and PUCCH transmissions in NTN systems, then the transmission can proceed with standard protocols, but the reliability of transmission is reduced due to large propagation delays
Solution Approach 1:
The patent applies parameter changes by introducing a first offset parameter that modifies the timing relationship between PDCCH reception and SL/PUCCH transmission. The starting time unit is determined as not earlier than a first moment calculated based on this offset, thereby compensating for large propagation delays in NTN systems and improving transmission reliability without requiring fundamental protocol changes
2Productivity
If the terminal device determines SL transmission starting time based on conventional methods, then the scheduling process is simple, but the alignment with network scheduling is poor leading to resource utilization inefficiency
Solution Approach 1:
The patent implements preliminary action by pre-determining the first offset parameter and the corresponding first moment before the actual transmission occurs. The terminal device uses these pre-calculated values to automatically determine the correct starting time unit for SL and PUCCH transmissions, ensuring alignment with network scheduling decisions while maintaining relatively simple implementation through the use of predefined timing parameters
Data Source
AI summary
There are provided a communication method, a terminal device, and a medium. The method includes: determining, by a terminal device, a starting time unit of a sideline (SL) transmission and/or a starting time unit of a physical uplink control channel (PUCCH) transmission, wherein a serving cell of the terminal device includes a non-terrestrial network (NTN) cell, wherein determining, by the terminal device, the starting time unit of the SL transmission includes: determining, by the terminal device based on a first offset and a moment when the PDCCH is received, the starting time unit of the SL transmission indicated/scheduled by a physical downlink control channel (PDCCH).