Sidelink Feedback Channel Capacity Using Eight-Level CDM
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing sidelink feedback channels, particularly in managing feedback resources to enhance capacity and improve data communication in devices such as UEs.
Innovation Solution
Implementing an eight-level code division multiplexing (CDM) scheme, multiple sub-physical-resource-block (sub-PRB) interlaces, and time domain orthogonal cover code (TD-OCC) schemes for configuring and transmitting feedback communications over sidelink feedback channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional feedback resource allocation is used in sidelink channels, then device complexity is reduced, but feedback channel capacity is insufficient
Solution Approach 1:
The feedback channel resources are segmented into multiple interlaces, where each interlace contains multiple physical resource blocks (PRBs). This segmentation allows for more granular allocation and increases the overall feedback channel capacity by enabling multiple UEs to be multiplexed within the same interlace using different PRBs and orthogonal cover codes.
Solution Approach 2:
The patent introduces an additional dimension for resource allocation by implementing eight-level code division multiplexing (CDM) using orthogonal cover codes (OCCs) across multiple PRBs within interlaces. This dimensional expansion from traditional single-PRB allocation to multi-PRB interlace-based CDM significantly increases feedback channel capacity while maintaining manageable complexity through structured code sequences.
2Quantity of substance
If feedback resources are increased to enhance capacity, then feedback channel capacity improves, but resource allocation complexity increases
Solution Approach 1:
The patent changes key parameters of the feedback resource structure by defining interlaces with specific PRB spacing patterns and assigning orthogonal cover codes with different lengths (e.g., length-2, length-4 OCCs). These parameter changes enable systematic capacity enhancement through mathematical relationships in the code structures, allowing capacity scaling without proportional increases in configuration complexity.
Solution Approach 2:
The interlace-based resource structure serves multiple functions simultaneously: it provides frequency diversity through PRB distribution, enables code division multiplexing through OCC application, and supports flexible capacity scaling by adjusting the number of interlaces and PRBs per interlace. This multi-functionality allows a single resource configuration framework to address multiple capacity requirements.
3Productivity
If multiple UEs are multiplexed in the same feedback resource, then resource utilization improves, but interference management becomes more difficult
Solution Approach 1:
The patent applies preliminary actions by pre-assigning orthogonal cover codes to different UEs before feedback transmission. These OCCs are designed to be orthogonal to each other, which preliminarily establishes interference isolation mechanisms. When UEs transmit feedback using their assigned OCCs on the same physical resources, the orthogonality property ensures that signals from different UEs do not interfere with each other, enabling efficient multiplexing.
Solution Approach 2:
The orthogonal cover codes act as intermediaries between multiple UEs sharing the same feedback resources. By embedding UE-specific OCC sequences in the feedback transmissions, the system mediates the interaction between multiple UEs, allowing their signals to coexist on the same physical resources without mutual interference. The receiver uses the known OCC sequences to separately decode each UE's feedback information.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration of a feedback resource associated with a sidelink feedback channel, wherein the feedback resource is associated with an eight-level code division multiplexing (CDM) scheme. The UE may transmit a feedback communication associated with a sidelink data communication using the feedback resource, wherein transmitting the feedback communication is based at least in part on using the eight-level CDM scheme to generate the feedback communication. Numerous other aspects are described.