UE Half-Duplex FDD Switching for Uplink/Downlink Coordination
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing radio resources based on different numerologies to meet the diverse requirements of enhanced mobile broadband, massive machine-type communication, and ultra-reliable and low-latency communication scenarios in next-generation wireless access networks, particularly for UEs that do not support simultaneous uplink and downlink transmission in FDD channels.
Innovation Solution
A method and device for transmitting and receiving signals in a half-duplex frequency division duplex (HD-FDD) scheme, where a UE or base station alternates between uplink and downlink operations based on received information, allowing for repeated transmissions or receptions in specific time or frequency resources to avoid collisions and enhance coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE in HD-FDD mode performs simultaneous uplink transmission and downlink reception in FDD channel, then data transmission rate is improved, but device complexity and configuration restrictions increase
Solution Approach 1:
The patent implements dynamic operation mode switching where the UE can transition between half-duplex mode (alternating uplink/downlink in time) and full-duplex mode (simultaneous uplink transmission and downlink reception) based on service requirements and channel conditions. This dynamic adaptability allows the system to optimize data transmission rate when full-duplex capability is available while maintaining compatibility with simpler half-duplex operation, thereby improving productivity without permanently increasing device complexity.
2Device complexity
If a UE alternates between uplink and downlink operations in HD-FDD mode, then device complexity is reduced, but loss of time occurs due to operation switching
Solution Approach 1:
The patent employs preliminary action by performing operation switching in advance based on predicted service patterns and channel conditions. The UE and base station exchange capability information and configure operation modes proactively before actual data transmission begins. This allows the system to pre-establish the optimal operation mode (half-duplex or full-duplex) and avoid frequent mode switching during active transmission, thereby reducing the time loss associated with operation changes while maintaining simplified device architecture.
3Reliability
If repeated transmissions are performed in specific time or frequency resources, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent applies local quality by implementing repeated transmissions selectively in specific time or frequency resources rather than uniformly across all transmissions. The system identifies particular resource locations where repetition is most beneficial for reliability (e.g., in challenging channel conditions or for critical data) and concentrates energy expenditure only at those locations. This localized approach to repetition improves reliability for critical communications while minimizing overall energy consumption by avoiding unnecessary repeated transmissions in good channel conditions.
Data Source
AI summary
Provided are a method and device for transmitting/receiving data in a half-duplex scheme. The method may include performing, as a first operation, one of signal transmission through an uplink and signal reception through a downlink in an FDD channel environment, receiving information indicating, as a second operation, the other of the signal transmission through the uplink and the signal reception through the downlink while performing the first operation, and stopping the first operation and performing the second operation according to the reception of the information.