PUSCH Retransmission Parameter Alignment for Grant-Free Uplink
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Solution Overview
Problem
The existing 5G NR system faces issues with transmission collisions due to differing performance characteristics between initial grant-free and dynamic scheduling retransmissions of PUSCH, leading to inconsistent reliability and latency.
Innovation Solution
A method and device that determine a unified parameter set for retransmission by combining ConfiguredGrantConfig and PUSCH-Config parameters to ensure consistent performance across both initial and retransmission phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If grant-free transmission is used for initial PUSCH transmission and dynamic scheduling is used for retransmission, then uplink transmission latency is reduced, but transmission collision occurs due to different configuration parameters
Solution Approach 1:
The patent combines configuration parameters from both grant-free (ConfiguredGrantConfig) and dynamic scheduling (PUSCH-Config) into a unified parameter set for retransmission. This merging approach ensures that retransmission uses consistent configuration parameters while maintaining the low-latency benefit of grant-free initial transmission.
Solution Approach 2:
The patent dynamically adjusts configuration parameters based on transmission phase. For initial transmission, grant-free parameters are used; for retransmission, a hybrid parameter set is formed by selecting appropriate parameters from both grant-free and dynamic scheduling configurations, thereby adapting to different transmission requirements.
2Adaptability or versatility
If different configuration parameters are used for grant-free initial transmission and dynamic scheduling retransmission, then transmission flexibility is improved, but performance inconsistency occurs between initial and retransmission phases
Solution Approach 1:
The patent applies different configuration parameters locally to different transmission phases. Initial transmission uses grant-free parameters optimized for low latency, while retransmission uses a hybrid parameter set that combines elements from both grant-free and dynamic scheduling configurations, ensuring each phase has optimal parameters for its specific requirements.
Solution Approach 2:
The patent implements dynamic parameter selection based on transmission phase. The configuration parameters are not fixed but are dynamically adjusted: grant-free parameters for initial transmission and a hybrid parameter set for retransmission, allowing the system to adapt to different operational requirements while maintaining performance consistency within each phase.
Data Source
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AI summary
Provided are a data retransmission method and device, and a terminal. The method includes: acquiring a radio resource control (RRC) signaling, wherein the RRC signaling at least comprises a first configuration field and a second configuration field; the first configuration field is a configured grant (ConfiguredGrantConfig) field, and the second configuration field is a physical uplink shared channel configuration (PUSCH-config) field; in the case that a base station dynamically schedules the terminal to perform a retransmission of a PUSCH, determining a parameter set for the retransmission according to a configuration parameter comprised in the first configuration field and a configuration parameter comprised in the second configuration field; and performing the retransmission of the PUSCH according to the determined parameter set.