Comb and Partial-Interlace Sidelink Feedback for OCB Compliance
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Solution Overview
Problem
Wireless communications systems face challenges in maintaining signal integrity and efficiency, particularly in complex and dynamic environments, where regulatory bandwidth requirements and UE multiplexing capacity are not adequately met by traditional sidelink feedback channel resources.
Innovation Solution
Implementing a partial interlace-based and comb-based structure for sidelink feedback channels that occupy a frequency domain with at least two resource blocks, allowing for multi-bit feedback transmission while satisfying Occupied Channel Bandwidth (OCB) constraints and enhancing UE multiplexing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional sidelink feedback channel resources are used, then device simplicity is maintained, but regulatory bandwidth requirements cannot be satisfied
Solution Approach 1:
The feedback channel resource is segmented into multiple resource blocks arranged in a comb pattern across the frequency domain. This segmentation allows the channel to occupy a distributed bandwidth that satisfies regulatory OCB requirements while maintaining manageable complexity through structured resource allocation.
Solution Approach 2:
The feedback channel transitions from a time-domain or single-frequency resource to a multi-frequency resource distributed across the frequency dimension. This dimensional change enables satisfaction of bandwidth occupancy requirements by spreading resources across multiple frequency points rather than concentrating them.
2Quantity of substance
If more feedback bits are transmitted, then data carrying capacity is improved, but signaling overhead increases
Solution Approach 1:
Multiple feedback bits are merged into a single composite feedback message transmitted through the partial interlace resource. This combining approach enables efficient transmission of multiple acknowledgment bits (e.g., for multiple HARQ processes) without requiring separate signaling channels for each bit, thereby reducing overall signaling overhead.
Solution Approach 2:
The feedback channel resource is designed to serve multiple functions simultaneously: it carries acknowledgment bits for multiple data transmissions, supports different feedback scenarios (ACK, NACK, DTX), and satisfies regulatory bandwidth requirements. This multi-functionality increases data carrying capacity without proportionally increasing signaling overhead.
3Reliability
If feedback channel resources are increased, then reliability is improved, but power consumption increases
Solution Approach 1:
Instead of allocating full interlace resources for feedback transmission, the patent uses partial interlaces that provide sufficient reliability for feedback purposes. This partial action approach achieves the minimum required reliability for acknowledgment transmission without the excessive power consumption that would result from using complete interlace resources.
4Productivity
If comb-based structure is used, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The comb-based structure changes the frequency domain parameters of the feedback channel by distributing resource blocks at regular intervals across the available bandwidth. This parameter change improves spectral efficiency by better utilizing frequency resources while the regular comb pattern maintains manageable complexity through predictable resource allocation.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for techniques for providing sidelink feedback. Certain aspects provide a method for wireless communication by a first user equipment (UE). The method generally includes receiving, from a second UE, one or more sidelink data messages and transmitting, to the second UE, via a first sidelink feedback channel resource, a first feedback message comprising one or more feedback bits associated with the one or more sidelink data messages, wherein: the first sidelink feedback channel resource comprises a first partial interlace group of a first interlace group of resource blocks, and the first partial interlace group comprises at least two first resource blocks.