Uplink Transmission Mode Selection for Non-Terrestrial Networks
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Solution Overview
Problem
In non-terrestrial networks (NTN) communication, channel measurement results can be inaccurate due to the rapid movement of low Earth orbit satellites and the ultra-large time delay of geosynchronous Earth orbit satellites, especially for user equipment (UE) without a Global Navigation Satellite System (GNSS) function, and the complexity of channel conditions.
Innovation Solution
An electronic device determines an appropriate uplink transmission mode for UE based on its ability and channel conditions, selecting from open-loop, close-loop, and semi-open-loop modes to obtain uplink transmission parameters, allowing for more suitable transmission and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink parameters are calculated based on satellite mobility information and UE position, then system efficiency is improved, but measurement precision deteriorates due to rapid satellite movement and ultra-large time delay
Solution Approach 1:
The patent implements dynamic uplink parameter adjustment by continuously tracking satellite mobility information and UE position changes. The system adapts transmission parameters in real-time based on varying channel conditions caused by satellite movement, resolving the contradiction between maintaining measurement precision and improving system efficiency through adaptive rather than static parameter calculation
Solution Approach 2:
The patent changes physical parameters of uplink transmission by adjusting transmission power, timing advance, and frequency offset based on satellite mobility information and channel conditions. This allows the system to maintain accurate uplink synchronization and compensation despite rapid satellite movement and large time delays, thereby improving both measurement precision and system efficiency
2Device complexity
If uplink parameters are calculated only based on UE position and satellite mobility information, then device complexity is reduced, but reliability deteriorates due to channel complexity
Solution Approach 1:
The patent introduces feedback mechanisms where the base station measures uplink signal quality and provides correction information to the UE. This feedback loop allows the system to maintain reliable uplink transmission by compensating for channel complexities that cannot be predicted solely from satellite mobility information and UE position, thereby improving reliability without significantly increasing device complexity
Solution Approach 2:
The patent uses the base station as an intermediary to bridge the gap between simple parameter calculation and reliable transmission. The base station receives uplink signals, measures channel conditions, and provides correction commands to the UE, enabling reliable communication over complex NTN channels while keeping UE complexity low
3Adaptability or versatility
If multiple uplink transmission modes are supported, then adaptability is improved for different UE abilities and channel conditions, but device complexity increases
Solution Approach 1:
The patent implements dynamic transmission mode selection where the system adapts between different uplink transmission modes based on real-time assessment of UE capabilities and channel conditions. This dynamic adaptation allows the system to achieve high versatility while managing complexity through automated mode selection rather than requiring complex manual configuration
Data Source
AI summary
The present invention relates to an electronic device, a wireless communication method, and a computer readable medium. The electronic device for wireless communication according to one embodiment comprises a processing circuit. The processing circuit is configured to determine, according to the capability of a user equipment and/or a channel situation between the user equipment and a base station for non-terrestrial network communication, an uplink transmission mode for the user equipment from two or more uplink transmission modes respectively corresponding to different acquisition manners of an uplink transmission parameter. The processing circuit is further configured to perform control so as to perform uplink transmission from the user equipment to the base station on the basis of the determined uplink transmission mode.