Unified Timing Parameter Transmission for NTN RAR Window Delays
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Solution Overview
Problem
In non-terrestrial network communication, large round-trip delays result in insufficient scheduling, feedback, and timing delays, necessitating multiple timing-related parameter transmissions that increase signaling overheads.
Innovation Solution
A terminal device determines timing offsets based on received time parameters to adjust scheduling and feedback delays without additional signaling, using formulas involving round-trip delays, common timing advance values, and RAR window durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device transmits multiple timing-related parameters to the terminal device to resolve insufficient scheduling delay, feedback delay, or timing delay, then the timing problems are resolved, but the signaling overhead increases
Solution Approach 1:
The patent combines multiple timing-related parameters (first timing offset for scheduling delay, second timing offset for feedback delay, third timing offset for configuration effectiveness) into a single time parameter field in the downlink control information. This merging approach allows the terminal device to derive all necessary timing adjustments from one parameter, resolving the contradiction between providing comprehensive timing control and minimizing signaling overhead.
Solution Approach 2:
The single time parameter field serves multiple functions simultaneously: it provides the first timing offset for uplink scheduling delay, the second timing offset for feedback delay adjustment, and the third timing offset for downlink configuration effectiveness timing. This multi-functionality eliminates the need for separate parameter transmissions while maintaining all necessary timing control capabilities.
2Duration of action of moving object
If the network device sends multiple timing-related parameters to adjust scheduling delay, feedback delay, and configuration timing, then sufficient timing is provided for NTN communication, but the signaling overhead becomes high
Solution Approach 1:
The patent merges three distinct timing adjustments (scheduling delay, feedback delay, configuration timing) into a single time parameter transmission. The terminal device calculates each specific timing offset based on this unified parameter, reducing the number of signaling messages while maintaining the necessary duration for NTN communication operations.
Solution Approach 2:
The network device transmits the time parameter in advance within the downlink control information, allowing the terminal device to pre-calculate all necessary timing offsets before actual communication occurs. This preliminary action eliminates the need for subsequent additional signaling messages to provide timing adjustments.
Data Source
AI summary
Embodiments of this application provide a parameter transmission method and an apparatus, and relate to the field of wireless communication technologies. In the method, the terminal device may receive first information. The first information may include a time parameter. The time parameter may be used to determine a timing offset. The timing offset includes a second timing offset, and the second timing offset indicates a delay of activation of configuration information. The terminal device determines a delay start duration of a random access response (RAR) window based on the second timing offset.