DL HARQ Timing Control for TDD-FDD Joint Operation
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Solution Overview
Problem
Current wireless communication systems lack a standardized method for controlling Downlink (DL) Hybrid Automatic Repeat Request (HARQ) timing in TDD-FDD joint operation, which is essential for efficient carrier aggregation and dual connectivity, leading to suboptimal data transmission rates due to asymmetric resource allocation and interference management.
Innovation Solution
A method and apparatus are introduced to configure and control DL HARQ timing in a base station that supports TDD-FDD joint operation by transmitting TDD-FDD CA configuration information to User Equipment (UE), allowing for efficient ACK/NACK signal processing and transmission, thereby optimizing DL resource utilization and enhancing data transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD-FDD joint operation is implemented to support carrier aggregation, then data transmission rate is improved, but DL HARQ timing control becomes complex and undefined
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting DL HARQ timing parameters (k values) based on the duplex mode configuration. When FDD mode is detected for the secondary cell, the system applies FDD-specific HARQ timing parameters (k=4) instead of TDD parameters, thereby resolving the timing control complexity while maintaining high data transmission rates in TDD-FDD joint operation
Solution Approach 2:
The patent segments the HARQ timing control into mode-specific configurations: TDD mode uses TDD-specific timing parameters while FDD mode uses FDD-specific parameters. This segmentation allows independent optimization of each mode's timing characteristics, simplifying the overall control mechanism while supporting carrier aggregation across different duplex modes
2Productivity
If carrier aggregation is adopted to utilize wide frequency bands, then data transmission rate is improved, but resource allocation asymmetry increases
Solution Approach 1:
The patent implements dynamic resource allocation by detecting the duplex mode (TDD or FDD) of each serving cell and applying appropriate HARQ timing configurations accordingly. This dynamic adaptation allows the system to optimize resource allocation for each cell's specific mode, reducing asymmetry management complexity while maintaining high aggregate data rates across multiple component carriers
3Reliability
If standardized DL HARQ timing control is implemented for TDD-FDD joint operation, then system performance is improved, but implementation complexity increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously detect whether the secondary cell operates in FDD or TDD mode and automatically apply the corresponding HARQ timing configuration without requiring complex standardized procedures. This self-configuration approach improves system performance through proper timing control while minimizing implementation complexity by leveraging existing mode detection capabilities
Data Source
AI summary
The present disclosure relates to an apparatus and method for controlling a downlink (DL) Hybrid Automatic Repeat reQuest (HARQ) timing in a system supporting a TDD-FDD joint operation and an FDD-TDD joint operation environment. A base station transmits a PDSCH and a UE transmits an HARQ response in response to the PDSCH. In the TDD-FDD joint operation, the interval between the PDSCH transmission and the HARQ response may be determined based on an FDD mode configuration when the PDSCH is transmitted through a TDD-based primary serving cell.