User Terminal Half-Duplex Slot Format Control
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Solution Overview
Problem
Legacy LTE systems face challenges in controlling half-duplex communication, particularly in configuring slot formats at the symbol unit level in future radio communication systems like NR, which requires precise management of transmission and reception directions across multiple cells.
Innovation Solution
A user terminal is equipped with a reception section to receive slot format information and a control section that instructs transmission and reception based on specific methods for each cell, allowing flexible configuration of transmission and reception directions to manage half-duplex communication effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slot format is configured to flexible at symbol unit level, then adaptability of transmission/reception configuration is improved, but control complexity of half-duplex communication increases
Solution Approach 1:
The patent divides the control of transmission/reception into cell-specific configurations. Each cell can have its own slot format configuration (flexible, uplink, or downlink), allowing independent control of transmission directions per cell while maintaining overall system coordination through the network side's scheduling decisions.
Solution Approach 2:
The patent introduces dynamic slot format switching capability where the network side can dynamically indicate whether a flexible slot should be used for uplink or downlink transmission. This allows the system to adapt transmission directions in real-time based on traffic demands while maintaining clear control mechanisms.
2Adaptability or versatility
If transmission and reception are controlled in multiple cells with flexible slot formats, then operational flexibility is improved, but risk of transmission/reception conflicts increases
Solution Approach 1:
The patent implements a control mechanism where the network side provides explicit indications to user terminals about the intended transmission direction for each flexible slot in each cell. This feedback loop ensures that user terminals can correctly interpret whether to transmit or receive in each cell, preventing conflicts arising from ambiguous configurations.
Solution Approach 2:
The patent allows different transmission/reception characteristics to be applied to different cells individually. Each cell can be configured with specific slot formats and transmission directions tailored to local requirements, enabling the system to optimize each cell's operation while maintaining overall coordination.
Data Source
AI summary
To appropriately control half-duplex communication in a future radio communication system, one aspect of a user terminal according to the present disclosure includes: a reception section that receives slot format information that indicates a slot format of a cell; and a control section, when transmission and reception in transmission directions are instructed, performs control to perform transmission and reception in a given cell and to not perform transmission and reception in another cell based on a method for instructing transmission and reception in each cell, the transmission directions being different between a plurality of cells for which slot formats are configured to flexible.