Dynamic HARQ Timing Selection for TDD LTE Frame Switching
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Solution Overview
Problem
The existing 3GPP standard for TDD LTE systems has a minimum varying period of SIB information of 640 ms, making it impossible to dynamically allocate the frame structure in time, and existing solutions for HARQ compatibility result in reduced HARQ processes, higher transmission time delay, and performance loss.
Innovation Solution
A method and device that select corresponding HARQ timing for each data sub-frame during dynamic frame structure switching in TDD LTE systems by searching for downlink and uplink data sub-frames with maximum control channel resolution in the TDD LTE frame structure table, ensuring compatibility with existing HARQ timing and improving ACK/NACK resolution and real-time performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HARQ timing of PDSCH complies with the frame structure having a maximum downlink frame proportion, then the HARQ timing is compatible with existing standards, but the quantity of HARQ processes is reduced
Solution Approach 1:
The patent applies dynamics by making the HARQ timing adaptable to different frame structures. Instead of fixing the HARQ timing to one frame structure, the system dynamically selects the appropriate HARQ timing based on the actual frame structure being used, allowing the HARQ process quantity to vary according to the downlink-uplink configuration while maintaining compatibility through proper timing selection.
Solution Approach 2:
The patent changes the parameter of HARQ timing configuration to match different frame structures. By adjusting the HARQ timing parameters according to the actual downlink-uplink configuration, the system can maintain compatibility with existing standards while optimizing the number of HARQ processes for each specific frame structure scenario.
2Reliability
If the uplink A/N is fed back in accordance with a default frame structure, then the HARQ timing is compatible with existing standards, but the A/N resolution is reduced
Solution Approach 1:
The patent changes the A/N feedback timing parameter to align with the actual frame structure rather than a default frame structure. This allows the A/N resolution to be optimized for the specific downlink-uplink configuration while maintaining compatibility through proper timing relationships, enabling accurate A/N feedback without being constrained by default frame structure limitations.
3Adaptability or versatility
If the UE observes a downlink channel in the actual uplink sub-frame, then the system maintains backward compatibility, but unnecessary power loss occurs
Solution Approach 1:
The patent applies dynamics by making the uplink-downlink configuration adaptable rather than fixed. The system dynamically configures frame structures to match actual traffic needs, allowing uplink sub-frames to be truly used for uplink transmission rather than being forced into downlink observation roles for compatibility reasons. This eliminates unnecessary power consumption while maintaining compatibility through proper configuration signaling.
Data Source
AI summary
The present disclosure discloses method for Hybrid Automatic Repeat Request (HARQ) of a dynamic frame structure, including: determining, by a system device, that a predefined sub-frame of a current frame contains Downlink Control Information (DCI) indicating a frame structure; in all Time Division Duplexing (TDD) LTE frame structures, selecting a corresponding HARQ timing for each data sub-frame between the predefined sub-frame of the current frame and the predefined sub-frame of a next frame; and receiving or sending a HARQ feedback according to the selected HARQ timing. The present disclosure also discloses a HARQ device of a dynamic frame structure. Through the solution of the present disclosure, during switching the dynamic frame structure of a TDD LTE system, a corresponding HARQ timing can be selected for each data sub-frame in each frame, thus increasing A/N resolution and real-time performance, ensuring a quantity of a HARQ process, and reducing transmission delay and blocking rate.