NB-IoT Uplink Gap Configuration for Non-GEO Satellite Synchronization
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Solution Overview
Problem
In non-terrestrial communication networks (NTN) with non-geostationary earth orbit (GEO) scenarios, the predefined uplink gaps in NB-IoT networks are not suitable due to the continuous change in wireless signal transmission delay caused by satellite movement, leading to inconsistent channel quality and interference issues.
Innovation Solution
Adaptive configuration of uplink gaps for NB-IoT terminals based on real-time network conditions, allowing for timing advance (TA) pre-compensation or adjustment to maintain synchronization and frequency offset compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If predefined uplink gaps are used in NB-IoT networks, then terminal devices can perform synchronous tracking and frequency offset compensation, but the channel quality becomes inconsistent and interference issues occur in non-GEO NTN networks due to continuous transmission delay changes caused by satellite movement
Solution Approach 1:
The patent transitions from static predefined uplink gap configurations to dynamic configurations that adapt to changing satellite positions and transmission delays. The network device determines uplink gap configurations based on real-time satellite orbital parameters and transmission delay variations, allowing the system to maintain synchronization and channel quality consistency despite continuous satellite movement in non-GEO NTN networks
Solution Approach 2:
The patent modifies the uplink gap configuration parameters dynamically based on satellite transmission delay changes. By calculating transmission delays using satellite orbital parameters and adjusting uplink gap timing accordingly, the system adapts to varying channel conditions caused by satellite motion, maintaining consistent channel quality and reducing interference
2Adaptability or versatility
If uplink gap configurations are optimized for non-GEO NTN networks with moving satellites, then transmission delay changes are compensated, but the complexity of configuration management increases due to different orbital altitudes and geographic positions
Solution Approach 1:
The patent implements a feedback mechanism where the network device calculates transmission delays based on satellite orbital parameters and provides corresponding uplink gap configurations to terminal devices. The system continuously monitors satellite position changes and adjusts configurations accordingly, creating a closed-loop control system that manages complexity through automated feedback-based adaptation rather than manual configuration
Solution Approach 2:
The patent enables terminal devices to automatically apply uplink gap configurations received from the network device without requiring manual intervention. The devices self-adjust their transmission timing based on the provided configurations, which are generated considering satellite orbital parameters and transmission delay variations, thereby reducing configuration management complexity while maintaining adaptability
Data Source
AI summary
Embodiments of the present disclosure provide a wireless communication method, a terminal device, and a network device. The method includes: obtaining configuration information of an uplink gap; and transmitting, based on the configuration information of the uplink gap repeatedly, uplink information on an uplink channel. The uplink gap is used for a terminal device to perform TA pre-compensation or TA adjustment on the uplink gap.