Sidelink Feedback Signaling Through CRC Piggybacking
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Solution Overview
Problem
Existing communication systems lack an efficient mechanism for providing feedback in broadcast-based sidelink (SL) communications, particularly in D2D and V2X scenarios, which affects reliability and resource usage without increasing complexity.
Innovation Solution
A communication device that modifies a conventional check value, such as a CRC, to signal acknowledgement/non-acknowledgement feedback without requiring additional resources by piggybacking this information on subsequent transmissions, using reversible operations to maintain error detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback mechanisms are introduced in broadcast-based sidelink communication, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines feedback information with existing check values (CRC) by merging the acknowledgment status into the check value computation. The transmitting device computes a check value that includes both error detection functionality and feedback information (ACK/NACK), thereby eliminating the need for separate feedback channels and reducing overall system complexity while improving reliability.
Solution Approach 2:
The check value is given multiple functions: it serves both as an error detection mechanism and as a feedback carrier. By making the check value universal, the patent eliminates the need for dedicated feedback channels, thus reducing device complexity while maintaining improved reliability through the feedback mechanism.
2Reliability
If additional channels are introduced for feedback transmission, then feedback reliability is improved, but bandwidth overhead increases
Solution Approach 1:
The patent merges feedback transmission with the existing data channel by incorporating acknowledgment information into the check value of the data transmission. This eliminates the need for separate feedback channels, thereby reducing bandwidth overhead while maintaining feedback reliability through the integrated mechanism.
Solution Approach 2:
The check value is made multi-functional, serving both as error detection and feedback transmission medium. This universality allows the system to convey feedback without requiring additional dedicated bandwidth, thus reducing overall bandwidth overhead while preserving feedback reliability.
3Quantity of substance
If conventional check values are modified to carry feedback, then bandwidth overhead is reduced, but error detection capability may be compromised
Solution Approach 1:
The patent segments the check value into two functional parts: one portion maintains error detection capability while another portion carries feedback information. By segmenting the check value computation, the system ensures that both error detection and feedback functions are preserved without compromising either, thus reducing bandwidth overhead while maintaining measurement precision.
Solution Approach 2:
The patent changes the parameters of the check value computation to accommodate both error detection and feedback information. By modifying how the check value is calculated and interpreted, the system maintains error detection capability while incorporating feedback, thereby reducing bandwidth overhead without compromising measurement precision.
Data Source
AI summary
Communication devices are provided that facilitate receiving information units and providing feedback to other communication devices.