Uplink HARQ Retransmission Using Feedback-Derived Process IDs
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Solution Overview
Problem
In New Radio (NR) systems operating on unlicensed spectrum, increased data transmission latency occurs due to the network side's inability to decode uplink data packets, leading to unknown HARQ process IDs and subsequent retransmission delays when UE cannot send data on scheduled UL resources.
Innovation Solution
A method where a terminal receives feedback information from a network side device to determine the HARQ process ID for unsuccessful uplink data, allowing for retransmission scheduling and data retransmission with the HARQ process ID included.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network side fails to decode the UL data packet and cannot know the HARQ process ID, then the network side cannot index the uplink data to schedule retransmission, but the UE has to wait for the network side to perform retransmission scheduling again, resulting in increased retransmission latency
Solution Approach 1:
The terminal determines the HARQ process ID in advance based on feedback information before retransmission is scheduled. This preliminary determination allows the terminal to prepare the retransmission data with the correct HARQ process ID, enabling the network side to immediately schedule retransmission without waiting for terminal calculation, thus reducing retransmission latency while maintaining scheduling capability
Solution Approach 2:
The network side provides feedback information to the terminal that enables the terminal to determine the HARQ process ID. This feedback mechanism allows the terminal to autonomously identify the correct HARQ process for retransmission, resolving the contradiction between the network side needing to know the HARQ process ID for scheduling and the terminal needing to quickly perform retransmission
2Ease of operation
If the UE calculates the HARQ process ID based on time and cannot send data during retransmission on the UL resources scheduled by the base station, then the UE has to wait for the network side to perform the retransmission scheduling again, but this waiting process increases the retransmission latency
Solution Approach 1:
The terminal uses feedback information from the network side to autonomously determine the HARQ process ID for retransmission. This self-service capability allows the terminal to independently identify the correct HARQ process and prepare retransmission data without waiting for network side scheduling, enabling faster retransmission while the network side retains scheduling authority
Solution Approach 2:
The terminal determines the HARQ process ID in advance using feedback information before the retransmission scheduling decision is made. This preliminary action allows the terminal to have the HARQ process ID ready when retransmission is scheduled, eliminating the time delay that would occur if the terminal had to calculate it after scheduling
Data Source
AI summary
This disclosure provides an information transmission method, a terminal and a network side device. The method includes: receiving, from a network side device, feedback information for a first uplink data; determining, according to the feedback information, an identifier of a first hybrid automatic repeat request (HARQ) process corresponding to the first uplink data not successfully received by the network side device; and performing data retransmission according to the identifier of the first HARQ process, where the retransmission data includes the identifier of the first HARQ process.