Full-Duplex HARQ Feedback for Faster UE Channel Reconfiguration
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Solution Overview
Problem
In wireless communication systems, the interworking operation between user equipment (UE) and a base station (BS) is hindered by self-interference in full duplex radio (FDR) environments, leading to significant delays in applying new configurations due to large Hybrid Automatic Repeat reQuest (HARQ) Round Trip Time (RTT), which reduces UE performance.
Innovation Solution
A method for transmitting and receiving signals in a wireless communication system involves receiving HARQ-ACK/NACK feedback and determining interference cancellation success or failure for every slot, with information transmitted in a next slot, allowing for timely channel configuration adjustments based on bitmap formats or data channel headers, and using fixed cyclic shift values for sounding reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interworking operation between the UE and the BS is performed according to the existing HARQ procedure, then the communication protocol is maintained, but a lot of time is consumed until a new configuration is applied to the UE for use in a system having a large HARQ RTT delay
Solution Approach 1:
The UE transmits interference cancellation information in advance in the uplink physical channel before the HARQ-ACK/NACK feedback is fully processed. This preliminary transmission of interference status allows the BS to prepare configuration changes proactively, reducing the overall time until new configuration is applied while maintaining protocol reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the UE reports interference cancellation information (success/failure) to the BS through uplink physical channels. This feedback enables the BS to make informed decisions about configuration adjustments, allowing faster adaptation to interference conditions while maintaining reliable communication through structured feedback loops.
2Speed
If interference cancellation information is transmitted for every slot, then the timing for configuration adjustment is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the essential interference cancellation information (success/failure status) for transmission in the uplink physical channel, rather than transmitting complete interference measurement data. This selective extraction reduces signaling overhead while providing sufficient information for the BS to make timely configuration adjustments.
Solution Approach 2:
The interference cancellation information is transmitted with different priorities and formats depending on the specific slot conditions and interference severity. Critical interference status information is transmitted with higher priority and more frequent updates, while normal conditions use standard reporting intervals, optimizing the balance between adjustment speed and signaling overhead.
Data Source
AI summary
The present document relates to a method by which a terminal transmits and receives a signal in a wireless communication system. Disclosed is a method for transmitting and receiving a signal, comprising the steps of: receiving a signal through a first slot from a base station; transmitting, to the base station, information including hybrid automatic repeat and request acknowledgment/negative-acknowledgement (HARQ-ACK/NACK) feedback for the signal through an uplink physical channel; and receiving, from the base station, channel configuration information on the basis of the information, wherein the information includes information on whether interference cancellation of the signal succeeds, whether or not the interference cancellation of the signal succeeds is determined for every slot, and the information is transmitted from a slot next to the first slot.