Index Modulation HARQ Codebook for Sidelink Feedback
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Solution Overview
Problem
Current wireless communication systems face interference issues in 5G NR sidelink communications, leading to performance degradation due to increased demand for mobile broadband access and congested networks, which existing technologies have not adequately addressed.
Innovation Solution
Implementing an index modulation-based hybrid automatic repeat request (HARQ) codebook over a sidelink feedback channel, allowing user equipment (UE) to transmit feedback messages efficiently across multiple sub-channels using a single sidelink feedback channel waveform without power splitting, thereby improving reliability and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs transmit feedback for multiple sub-channels using separate sidelink feedback channel waveforms with power splitting, then feedback coverage is provided, but transmit power is reduced and performance is degraded
Solution Approach 1:
The patent combines multiple feedback messages for multiple sub-channels into a single feedback message transmitted over one sidelink feedback channel waveform. This merging approach allows the UE to transmit all feedback information in one unified transmission, avoiding power splitting across multiple waveforms and thereby maintaining full transmit power for reliable feedback delivery.
Solution Approach 2:
The single sidelink feedback channel waveform is designed to carry multiple feedback messages simultaneously, making it multi-functional. This universal waveform structure can handle feedback for any number of sub-channels, eliminating the need for separate dedicated waveforms for each sub-channel and ensuring consistent power transmission regardless of the number of feedback messages.
2Loss of information
If separate sidelink feedback channel waveforms are used for each sub-channel, then feedback for each transmission is provided, but device complexity and resource overhead increase
Solution Approach 1:
Multiple feedback messages that would otherwise require separate waveforms are merged into a single feedback message structure. This consolidation reduces the number of feedback channel resources needed and simplifies the management overhead, while still preserving complete feedback information for all sub-channels through the unified message format.
3Reliability
If power splitting is used to transmit feedback across multiple waveforms, then feedback coverage is achieved, but interference increases and performance degrades
Solution Approach 1:
By merging multiple feedback transmissions into a single waveform, the patent eliminates the interference that arises from power splitting across multiple waveforms. The unified transmission approach ensures that the full transmit power is concentrated in one waveform, reducing inter-waveform interference and improving overall feedback transmission reliability.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support an index modulation (IM)-based acknowledgement codebook so use with sidelink feedback. In a first aspect, a first UE receives at least one sidelink transmission from a second UE with a sidelink control information (SCI) message that triggers least one IM-based feedback message codebook. The first UE may determine an IM-based feedback message sequence, determine, based on the feedback sequence, a resource for transmission of the IM-based feedback message, wherein a resource index corresponds to the determined feedback message sequence. The first UE may then transmit the IM-based feedback message codebook on the determined resource to the second UE over the sidelink. Other aspects and features are also claimed and described.