Configured Grant Uplink HARQ Feedback Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in increasing the reliability and reducing latency of uplink transmissions, particularly in configured grant operations, due to the lack of explicit HARQ feedback and potential collisions in non-orthogonal resource allocation.
Innovation Solution
The introduction of explicit HARQ feedback for configured uplink transmissions allows the UE to autonomously manage repetition bundles, reduce unnecessary repetitions, and flush the HARQ buffer earlier, enabling more reliable and timely packet transmission by determining the optimal transmission occasion based on network indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE repeats the transport block across multiple slots in configured grant operation, then the reliability of transmission is improved, but the latency and overhead increase
Solution Approach 1:
The patent introduces explicit HARQ feedback mechanisms for configured grant transmissions. The network sends HARQ acknowledgments to indicate successful reception or need for retransmission, allowing the UE to stop repeating transmissions unnecessarily and reduce latency while maintaining reliability through targeted retransmissions only when needed.
Solution Approach 2:
The patent enables dynamic adjustment of transmission behavior based on HARQ feedback. The UE can transition from static repetition modes to dynamic transmission control, adjusting whether to continue repeating or stop based on network indications, thereby optimizing the balance between reliability and latency for each specific transmission scenario.
2Device complexity
If the UE transmits without explicit HARQ feedback, then the overhead is reduced, but the ability to manage transmission reliability and reduce unnecessary repetitions is compromised
Solution Approach 1:
The patent implements HARQ feedback mechanisms that provide network status information to the UE. This feedback loop enables the UE to manage transmission reliability effectively by knowing whether transmissions were successful, allowing the system to maintain reliability management capabilities while controlling overhead through efficient feedback protocols.
3Productivity
If the UE uses the same HARQ process for multiple transmission occasions, then the productivity is improved, but the risk of collision in non-orthogonal resource allocation increases
Solution Approach 1:
The patent uses HARQ feedback to coordinate multiple transmissions using the same HARQ process. The feedback mechanism allows the network to indicate when resources are still needed or when transmissions can proceed, reducing collision risks in non-orthogonal resources while maintaining high productivity through efficient resource utilization and coordinated access.
Data Source
AI summary
A configured-grant configuration can be transmitted. The configured-grant configuration can configure periodic plurality of UL repetition bundles, each UL repetition bundle including a number of PUSCH repetitions. The periodic plurality of UL repetition bundles can include a plurality of transmission occasions. A first TB can be received in UL resources corresponding to at least a portion of an UL repetition bundle of the periodic plurality of UL repetition bundles. An indication can be determined and transmitted. A second TB can be received in a transmission occasion. The second TB can include different data from the first TB. The transmission occasion can be determined based on the indication and among the plurality of transmission occasions of the periodic plurality of uplink repetition bundles.