HARQ Feedback Reset for 5G Unlicensed Spectrum Reliability
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Solution Overview
Problem
In the 5G NR-U communication system, terminal devices face challenges in effectively processing and transmitting HARQ information on unlicensed spectrum due to uncertainty in channel usage, leading to potential multiple transmissions before successful receipt by the network device.
Innovation Solution
A method and device for HARQ information feedback are provided, where the terminal device determines HARQ information for a channel group and resets it upon receiving a second channel meeting specific conditions or receiving indication information for resetting, thereby optimizing HARQ information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device transmits HARQ information multiple times due to channel uncertainty, then the reliability of HARQ information reception is improved, but the transmission time and channel resources are consumed
Solution Approach 1:
The terminal device performs preliminary actions by resetting HARQ information before transmission and using indication information to prepare for potential retransmissions. The network device sends indication information in advance to signal when HARQ information should be reset, allowing the terminal to prepare appropriately without waiting for failed transmission attempts.
Solution Approach 2:
The system implements feedback mechanisms where the network device sends indication information to the terminal device about the status of HARQ information transmission. This feedback loop allows the terminal to know when to reset HARQ information based on actual transmission status, optimizing the balance between reliability and time consumption.
2Reliability
If the terminal device maintains HARQ information for multiple channel groups, then the completeness of feedback is improved, but the device complexity increases
Solution Approach 1:
The system segments HARQ information by channel group, allowing the terminal device to manage different channel groups independently. Each channel group has its own HARQ information that can be processed and reset separately, reducing the complexity of managing all channel groups simultaneously while maintaining complete feedback.
Solution Approach 2:
Different channel groups are treated with different qualities of attention based on their specific characteristics and transmission status. The terminal device applies local reset strategies for each channel group based on indication information specific to that group, rather than applying a uniform complex management approach to all groups.
3Duration of action of stationary object
If the terminal device transmits HARQ information without timely resetting, then the transmission continuity is improved, but the bit overhead increases
Solution Approach 1:
The terminal device performs preliminary reset actions based on indication information received from the network device. Instead of maintaining HARQ information indefinitely, the device prepares for timely resetting by monitoring indication signals, which optimizes the retention duration and reduces unnecessary bit overhead.
Solution Approach 2:
The system changes the parameter of HARQ information retention based on transmission status and indication information. The terminal device adjusts the effective retention duration dynamically, extending it when needed for reliability and reducing it when reset is indicated, thereby optimizing bit overhead.
Data Source
AI summary
Provided are an HARQ information feedback method and device, capable of performing effective processing on HARQ information corresponding to each channel group, thereby implementing transmission of HARQ information on an unlicensed band. The method comprises: a terminal device determines HARQ information corresponding to a first channel group; after receiving a second channel satisfying a preset condition, and/or receiving first instruction information for instructing to reset the HARQ information, the terminal device resets the HARQ information corresponding to the first channel group, wherein the preset condition comprises that the HARQ process number of the second channel is the same as the HARQ process number of a first channel in the first channel group, and/or the group number of the channel group to which the second channel belongs is the same as the group number of the first channel group.