Random Access Selection Using GNSS Accuracy in NTN Links
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Solution Overview
Problem
In non-terrestrial networks, the accuracy of satellite positioning information provided by GNSS can be unreliable, leading to inefficiencies and unreliability in the random access procedure due to inaccurate pre-compensation of propagation delay and frequency offset.
Innovation Solution
A device determines the accuracy of satellite positioning information and selects an appropriate random access procedure, such as a 2-step or 4-step RA, based on the estimated accuracy to ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a 2-step random access procedure is used with inaccurate satellite positioning information, then access speed is improved, but communication reliability deteriorates due to failed pre-compensation of propagation delay and frequency offset
Solution Approach 1:
The system dynamically selects between 2-step and 4-step random access procedures based on the estimated accuracy of satellite positioning information. When positioning accuracy is high, the faster 2-step procedure is used; when accuracy is low, the more reliable 4-step procedure is used. This dynamic adaptation resolves the contradiction by allowing the system to optimize for speed when conditions permit and for reliability when conditions require.
Solution Approach 2:
The system changes the parameter of random access procedure type based on the accuracy parameter of satellite positioning information. By monitoring the accuracy estimate and switching between different procedure types (2-step vs 4-step), the system adjusts its behavior to match current conditions, thereby resolving the contradiction between speed and reliability.
2Reliability
If a 4-step random access procedure is used with accurate satellite positioning information, then communication reliability is improved, but access efficiency deteriorates due to additional steps
Solution Approach 1:
The system dynamically adapts the random access procedure based on real-time accuracy estimates of satellite positioning information. When accuracy is high, it employs the efficient 2-step procedure; when accuracy is low, it switches to the reliable 4-step procedure. This dynamic selection optimizes the balance between efficiency and reliability based on actual conditions.
Solution Approach 2:
The system changes the random access procedure parameter based on the positioning accuracy parameter. This parameter-driven selection allows the system to choose the optimal procedure type (2-step or 4-step) according to the quality of available positioning information, thereby resolving the contradiction between efficiency and reliability.
3Speed
If the system always uses the 2-step random access procedure, then access speed is maximized, but reliability deteriorates when satellite positioning information is inaccurate
Solution Approach 1:
The system uses feedback from accuracy estimates of satellite positioning information to adjust its random access procedure selection. By continuously monitoring the accuracy parameter and using this feedback to switch between 2-step and 4-step procedures, the system maintains both speed and reliability according to actual conditions.
Solution Approach 2:
The system transitions from a static always-2-step approach to a dynamic conditional selection approach. Based on real-time accuracy estimates, the system adapts its behavior by selecting either the fast 2-step procedure or the reliable 4-step procedure, thereby resolving the contradiction between speed and reliability.
4Reliability
If the system always uses the 4-step random access procedure, then communication reliability is maximized, but access efficiency deteriorates
Solution Approach 1:
The system uses feedback from positioning accuracy estimates to optimize its random access procedure selection. When accuracy is high, the feedback mechanism enables the system to switch to the more efficient 2-step procedure; when accuracy is low, it maintains the reliable 4-step procedure. This feedback-driven adaptation resolves the contradiction between reliability and efficiency.
Solution Approach 2:
The system changes its random access procedure parameter based on the positioning accuracy parameter. This parameter-driven dynamic selection allows the system to optimize both reliability and efficiency by choosing the appropriate procedure type according to the quality of available satellite positioning information.
Data Source
AI summary
Various example embodiments relate to performing random access to a communication network. An apparatus may determine satellite positioning information comprising a location of the apparatus and/or time information. The apparatus may determine an estimate of the accuracy of the satellite positioning information and select a type of random access procedure accordingly. Apparatuses, methods, and computer programs are disclosed.