NTN Access Control Using Timing-Frequency Offset Restrictions
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Solution Overview
Problem
In non-terrestrial networks (NTN) with high-altitude base stations and high mobility, large delays and high Doppler shifts degrade communication quality, leading to potential user access failures, and traditional terrestrial networks fail to meet the diverse requirements of different types of base stations.
Innovation Solution
An access control method and apparatus that includes determining whether to access a network based on an access configuration message, considering factors like position, speed, timing-frequency offset, and user capabilities, and implementing access restrictions to ensure compliance with network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If base stations operate at high altitude with high mobility in NTN, then coverage area is expanded, but communication quality degrades due to large delay and high Doppler shift
Solution Approach 1:
The base station performs preliminary access restriction determination before allowing user access. By evaluating whether the base station meets access conditions (such as timing-frequency offset thresholds) in advance, the system prevents communication quality degradation from occurring, rather than reacting after degradation happens.
Solution Approach 2:
The access restriction mechanism dynamically adapts to different base station scenarios. The base station determines access conditions based on its specific situation (NTN or terrestrial network, high altitude or ground-based), allowing the system to flexibly adjust access control parameters according to operational context rather than using fixed rules.
2Device complexity
If traditional terrestrial network access control mechanisms are used, then implementation is simple, but they cannot satisfy diverse requirements of different types of base stations in spatial three-dimensional network
Solution Approach 1:
The access control mechanism is segmented into different determination branches based on base station type. The base station first determines whether it is an NTN base station or terrestrial base station, then applies appropriate access control rules for each segment. This segmentation allows simple implementation within each segment while achieving overall versatility across different base station types.
Solution Approach 2:
The access control mechanism is designed to serve multiple functions across different network types. A single unified mechanism handles both NTN and terrestrial base stations by incorporating conditional determination logic, eliminating the need for separate access control systems for different base station types while maintaining adaptability to their diverse requirements.
3Reliability
If users access the network without access restriction, then access success rate increases, but network performance degrades when delay and Doppler shift exceed tolerance range
Solution Approach 1:
The base station provides feedback to users regarding access conditions through system information broadcasting. Users receive information about timing-frequency offset thresholds and other access requirements, allowing them to determine whether they meet the conditions before attempting access. This feedback loop prevents unsuccessful access attempts that would degrade network performance.
Solution Approach 2:
The system takes preliminary anti-action by restricting access before communication quality degradation can occur. By evaluating access conditions (such as whether timing-frequency offset is within threshold) before user access attempts, the system prevents harmful communication scenarios from developing, thereby maintaining both access success rate and network performance.
Data Source
AI summary
Provided are an access control method and apparatus, and a device and a storage medium. The access control method includes: receiving an access configuration message transmitted by a second communication node; and determining whether to access a network according to the access configuration message.