NR-U HARQ Process Status Control for LBT-Failed Uplink Data
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Solution Overview
Problem
In NR-U technology, when uplink data transmission fails due to LBT failures, the HARQ process remains pending, causing the data to be stored in the buffer and preventing subsequent transmissions, leading to inefficient data handling.
Innovation Solution
The terminal determines the initial status of HARQ processes and sets them to a not pending status using RRC signaling or DCI activation commands, allowing new transmissions to proceed even after LBT failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HARQ process remains in pending status after LBT failure, then the uplink data is preserved in the buffer, but the HARQ process cannot be reused for new transmissions, leading to resource inefficiency
Solution Approach 1:
The patent applies preliminary action by introducing a pending status that is set in advance when LBT failure occurs, before the data is overwritten. This pending status acts as a preliminary marker that prevents premature reuse of the HARQ process, ensuring data preservation while enabling future retransmission opportunities when the status is subsequently cleared
Solution Approach 2:
The patent implements dynamics by making the HARQ process status changeable between pending and non-pending states. The status is dynamically updated based on LBT success/failure and retransmission outcomes, allowing the system to adapt between preserving data (pending state) and reusing resources (non-pending state) according to actual transmission conditions
2Device complexity
If the terminal cannot determine the initial status of HARQ processes, then the system simplifies state management, but new transmissions cannot proceed because the terminal lacks knowledge of available HARQ processes
Solution Approach 1:
The patent applies self-service by having the terminal autonomously determine the initial status of HARQ processes through predefined rules rather than requiring external network configuration. The terminal independently assesses whether HARQ processes are in pending or non-pending status based on local state information, enabling seamless transmission initiation without increasing network-side complexity
Data Source
AI summary
Embodiments of this application provide a HARQ process-based data transmission method and a terminal, and relate to communication technologies, to determine an initial status of a HARQ process and further perform uplink transmission by using a HARQ process that is in a not pending status. A specific solution includes: A terminal sets one or more HARQ processes that are associated with a first configured grant CG configuration on a first bandwidth part BWP to be in a not pending status, where the first CG configuration includes one or more CG configurations configured by a network device for the terminal on the first BWP, and the first BWP is a currently activated BWP of the terminal; and the terminal sends uplink data to the network device by using the HARQ process that is associated with the first CG configuration and that is in the not pending status.