Reference Signal Carrying Sidelink Feedback in 5G NR
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Solution Overview
Problem
In 5G new radio (NR) technology, the incompatibility between sending feedback information through a control or data channel and a physical sidelink feedback channel (PSFCH) leads to reduced transmission efficiency, as existing mechanisms require puncturing or rate matching, affecting the original transmission efficiency of control or data channels.
Innovation Solution
A method where a reference signal carries sidelink feedback information, allowing terminals to send feedback without occupying the control or data channel, thereby avoiding puncturing or rate matching operations and ensuring compatibility between control/data channel transmission and PSFCH feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information is sent through control channel or data channel, then feedback can be transmitted, but puncturing or rate matching must be performed which reduces transmission efficiency
Solution Approach 1:
The patent introduces a reference signal as an intermediary carrier to transmit feedback information. Instead of directly embedding feedback in control or data channels (which causes puncturing/rate matching), the feedback is modulated onto reference signal resources. This mediator approach allows feedback transmission without disrupting the original control/data channel transmission efficiency.
2Reliability
If feedback information is sent through PSFCH, then dedicated feedback channel is used, but incompatibility arises when both control/data channel and PSFCH need to send feedback in same slot
Solution Approach 1:
The patent makes the reference signal multi-functional by enabling it to carry both its original purpose (channel estimation/reference) and feedback information simultaneously. This universal approach allows the same signal resource to serve multiple functions, eliminating the need for separate PSFCH resources and resolving the incompatibility issue when multiple channels need to transmit feedback in the same slot.
3Loss of information
If puncturing or rate matching is performed on control or data channel, then feedback information can be included, but original transmission efficiency is affected
Solution Approach 1:
The patent extracts the feedback information from the control or data channel and places it onto separate reference signal resources. By taking out the feedback content and relocating it to a dedicated reference signal carrier, the original control/data channel transmission remains intact without requiring puncturing or rate matching operations, thus preserving transmission efficiency while still delivering feedback information.
Data Source
AI summary
A feedback information sending method and an apparatus are provided. A first communications apparatus may determine sidelink feedback information, and send a reference signal to a second communications apparatus, where the reference signal carries the sidelink feedback information. In this way, terminals can send and receive the sidelink feedback information by using the reference signal, to improve transmission efficiency of the sidelink feedback information. When the terminal needs to send both a control channel or a data channel and feedback information in a same slot, this method avoids a problem that the terminal needs to simultaneously send two channels, e.g., the control channel (or the data channel) and a feedback channel, avoids reducing original transmission efficiency of the control channel or the data channel, and implements compatibility between sending through the control channel (or the data channel) and feedback through the feedback channel.