Sidelink Feedback Interlacing for Higher UE Power and Capacity
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving optimal channel bandwidth occupancy and transmission power efficiency in sidelink feedback channels, leading to suboptimal capacity utilization and power limitations.
Innovation Solution
The solution involves transmitting sidelink feedback information using a configurable quantity of interlaced resource blocks (IRBs) across the sidelink feedback channel, allowing for increased transmission power and optimizing the distribution and pattern of IRBs to avoid power spectral density limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If UEs transmit feedback via a single resource block in sidelink feedback channel, then resource utilization is simple and device complexity is low, but transmission power is limited and capacity utilization is suboptimal
Solution Approach 1:
The feedback channel resources are segmented into multiple interlaced resource blocks (IRBs) distributed across different frequency subcarriers. Instead of using a single contiguous resource block, the system divides the feedback transmission into multiple separated RBs that are interlaced in the frequency domain, allowing UEs to transmit feedback across multiple resources simultaneously, thereby increasing transmission power and capacity utilization while maintaining manageable complexity through standardized interlacing patterns
Solution Approach 2:
The patent transitions from single-dimension (single RB) feedback transmission to multi-dimension feedback transmission by distributing feedback signals across multiple frequency subcarriers and time slots. The interlaced resource block structure creates a multi-dimensional resource allocation pattern where feedback can be transmitted simultaneously on multiple frequency resources, effectively adding a frequency diversity dimension to the feedback channel
2Reliability
If UEs use contiguous resource blocks for feedback transmission, then transmission power concentration is high, but interference sensitivity increases and channel bandwidth occupancy is suboptimal
Solution Approach 1:
The feedback channel is segmented into multiple interlaced resource blocks distributed across the frequency spectrum. This segmentation separates the feedback transmission from concentrated interference sources and distributes the signal across multiple frequency slots, reducing sensitivity to localized interference while maintaining efficient channel occupancy through the interlaced structure
Solution Approach 2:
Different interlaced resource blocks are assigned to different UEs or feedback types based on local channel conditions and interference patterns. The system applies local quality optimization by allowing UEs to select or be assigned specific IRBs that have favorable channel conditions, thereby improving reliability without sacrificing overall channel capacity
3Power
If UEs transmit feedback on common interlace resources, then resource allocation is simple, but power spectral density limits are exceeded and transmission power efficiency is reduced
Solution Approach 1:
The common interlace resources are segmented and assigned to multiple UEs in a distributed manner. Instead of all UEs transmitting on the same frequency resources simultaneously, the system divides the interlaced RBs among different UEs or uses time-division multiplexing within the interlace structure, allowing each UE to transmit at efficient power levels without exceeding PSD limits while maintaining simple resource allocation through standardized interlacing patterns
Solution Approach 2:
The system dynamically assigns interlaced resource blocks to different UEs based on channel conditions, traffic load, and power availability. This dynamic resource allocation within the interlace structure allows flexible power management where UEs can be assigned different IRBs or different time slots within the interlace, optimizing transmission power efficiency without requiring complex per-UE resource configuration
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for a user equipment (UE) to transmit feedback information via a configurable quantity of interlaced resource blocks (IRBs) in one or more interlaces of a sidelink feedback channel. For example, the UE may transmit feedback via multiple IRBs of an interlace. The UE may determine which IRBs to use in accordance with a configuration, which may indicate a quantity of IRBs, a distribution of the IRBs, a pattern of the IRBs, or any combination thereof. Additionally, or alternatively, the UE may determine to transmit feedback via multiple IRBs of an interlace that is different from a common interlace.