Multicast Feedback Mode Segmentation for Signaling Overhead
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Solution Overview
Problem
Current wireless communication systems face issues with data loss and reduced transmission reliability due to incorrect reception of Sidelink Control Information (SCI) in multicast communication, as receivers may not feedback correctly, leading the transmitter to mistakenly believe data was successfully received and not retransmit.
Innovation Solution
A communication feedback method where a target subset of multicast receivers is identified based on channel quality, with the first feedback mode instructing them to acknowledge correct data receipt and negative acknowledge incorrect receipt, while other receivers employ a second mode that only feeds back on errors, reducing signaling overhead and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If all multicast receivers employ the second feedback mode (feedback only on error), then signaling overhead is reduced, but transmission reliability deteriorates because receivers that fail to decode SCI cannot feedback NACK and the transmitter cannot detect the failure
Solution Approach 1:
The patent applies local quality by differentiating feedback behaviors for different receiver groups. Receivers in the target subset (those that successfully decoded SCI) employ the second feedback mode (feedback only on error) to reduce signaling overhead, while receivers outside the target subset (those that failed to decode SCI) employ the first feedback mode (feedback both ACK and NACK) to ensure reliability. This localized differentiation resolves the contradiction by optimizing each group's feedback behavior according to its specific condition.
2Reliability
If all multicast receivers employ the first feedback mode (feedback both ACK and NACK), then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the multicast receiver population into two distinct groups: a target subset that successfully decoded the SCI and non-target receivers that failed to decode it. This segmentation allows the system to apply different feedback modes to different segments, thereby reducing overall signaling overhead while maintaining reliability where needed. The target subset uses the more efficient second mode, while the non-target subset uses the more reliable first mode.
3Productivity
If the transmitter does not receive NACK feedback, then it assumes successful transmission and avoids retransmission, but data loss occurs when receivers failed to decode SCI
Solution Approach 1:
The patent enhances the feedback mechanism by having receivers outside the target subset (those that failed to decode SCI) employ the first feedback mode to send NACK feedback. This ensures that the transmitter receives explicit negative acknowledgment when data transmission fails, enabling it to detect transmission failures and perform retransmissions. This feedback mechanism resolves the contradiction by ensuring reliability through proper feedback while maintaining efficiency through selective application.
Data Source
AI summary
The disclosure provides a communication feedback method including the following. A target subset is determined from a set of multicast receiving devices. A first control signaling is transmitted. The first control signaling is for instructing the target multicast receiver in the target subset to employ a first feedback mode. The first feedback mode is for feeding an ACK back when communication data transmitted by the multicast transmitter is received correctly and for feeding a NACK back when communication data transmitted by the multicast transmitter is not received correctly. The first control signaling is for instructing other multicast receivers outside the target subset to employ a second feedback mode. The second feedback mode is for not feeding back when communication data transmitted by the multicast transmitter is received correctly and for feeding the NACK back when communication data transmitted by the multicast transmitter is not received correctly.