Random Access Time Window Adjustment for NTN Signal Delay
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Solution Overview
Problem
In non-terrestrial network (NTN) systems, the increased signal propagation delay due to satellite communication poses challenges for efficient random access, as conventional time windows are not suitable for varying signal delays between terminal devices and satellites.
Innovation Solution
A method for random access that determines a time window for a terminal device based on first and second information. The second information represents the distance between the terminal device and a network device, and the first information includes an adjustment parameter to adjust the nominal value of the time parameter of the time window, which includes duration and/or offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed time window is used for random access response monitoring, then the terminal device can simply monitor the window, but the signal propagation delay variation in NTN systems causes the terminal device to miss the RAR message
Solution Approach 1:
The patent changes the time window parameters (duration and offset) from fixed values to dynamically adjustable values based on distance information. The network device configures different time window parameters for terminal devices at different distances, ensuring that each terminal can correctly monitor the RAR message despite varying signal propagation delays in NTN systems.
2Reliability
If the time window duration is extended to cover all possible signal delays, then all terminal devices can receive the RAR message, but the message monitoring becomes inefficient and consumes excessive time
Solution Approach 1:
The patent applies local quality by configuring different time window parameters for terminal devices based on their specific distance characteristics. Each terminal device receives customized time window configuration suited to its location, rather than using a uniform extended time window for all devices. This optimizes the monitoring time for each terminal while ensuring reliable RAR reception.
3Productivity
If the time window offset is adjusted for each terminal device based on distance, then the RAR message can be received efficiently, but the system requires additional distance information and configuration complexity
Solution Approach 1:
The patent introduces distance information as an intermediary parameter that mediates between the terminal device's location and the appropriate time window configuration. The network device uses this intermediate distance information to determine and configure the optimal time window offset and duration for each terminal, enabling efficient random access without direct complex coordination.
Data Source
AI summary
A method for random access and a communication device are provided. The method includes the following. A time window used by a terminal device for reception of a downlink (DL) message during random access is determined according to first information and/or second information. The second information represents a distance between the terminal device and a network device. The first information includes an adjustment parameter, the adjustment parameter is used for adjusting a nominal value of a time parameter of the time window, and the time parameter includes a duration and/or an offset of the time window.