Dynamic Transmission Direction Indication in FDD Wireless Systems
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Solution Overview
Problem
In FDD wireless communication systems, terminals lack the ability to dynamically acquire information for indicating transmission direction, limiting their flexibility and ability to support various services, especially with emerging applications like virtual reality and vehicle-to-vehicle communication.
Innovation Solution
A data transmission method where a base station sends target information for indicating transmission direction to a terminal through physical layer channels, allowing the terminal to determine uplink and downlink data transmission directions based on pre-configured detection times and indication unit allocation information, enabling dynamic adaptation in FDD mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed uplink and downlink time slot allocation method is used in FDD system, then system stability is maintained, but flexibility and adaptability to support more service types deteriorates
Solution Approach 1:
The patent introduces dynamic slot format indication through GC-PDCCH signaling, allowing the network to flexibly configure uplink and downlink slot allocations in real-time. This enables the FDD system to adapt to different service requirements (e.g., VR, V2V) without changing the fundamental FDD architecture, thus improving adaptability while maintaining manageable system complexity through standardized dynamic signaling mechanisms.
2Adaptability or versatility
If resources are reserved on both downlink and uplink carriers for future technologies, then system extendibility is ensured, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent enables dynamic reconfiguration of reserved resources through slot format indication signaling. Resources that were traditionally reserved and left idle can now be dynamically allocated to uplink or downlink based on actual service demands. This allows the system to maintain extendibility for future technologies while significantly improving resource utilization efficiency by activating reserved resources when needed.
3Reliability
If terminal uses traditional FDD mode with separate uplink and downlink carriers, then transmission reliability is maintained, but ability to acquire dynamic transmission direction information deteriorates
Solution Approach 1:
The patent extends the functionality of GC-PDCCH in FDD mode to carry slot format indication information, which traditionally was only used in TDD mode. This multi-functional use of existing control channels allows terminals in FDD mode to acquire dynamic transmission direction information without compromising the reliability of separate uplink and downlink carrier transmissions. The existing FDD architecture remains intact while gaining new capabilities.
Data Source
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AI summary
The present disclosure provides a data transmission method, device, and system, and relates to the field of wireless communications technologies. The method includes: a base station acquiring target transmission direction indication information, the target transmission direction indication information being used by a terminal to determine uplink data transmission and downlink data transmission directions in a target mode, and the target mode being a mode in which the terminal performs, on the basis of different carriers, uplink data transmission and downlink data transmission respectively; the base station sending the target transmission direction indication information to the terminal; and the terminal determining, on the basis of the target transmission direction indication information, uplink data transmission and downlink data transmission directions in the target mode. The present disclosure solves the problem in which a terminal cannot acquire dynamic transmission direction indication information in a target mode, such as an FDD mode, such that the terminal can acquire the dynamic transmission direction indication information in the target mode, thereby completing data transmission in the target mode. The disclosure is used in data transmission.