Sidelink COT Reservation Using FDM Interlace Separation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel occupancy times (COTs) for sidelink communications, particularly in unlicensed spectra, leading to interference and inefficient resource utilization.
Innovation Solution
Implementing frequency division multiplexing (FDM) channel access and out-of-COT resource reservation techniques to manage sidelink communications, allowing UEs to reserve and utilize COT resources outside the reserved periods and avoid conflicts by using different interlaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs reserve COT resources for sidelink communications in unlicensed spectra, then resource utilization is improved, but interference and resource conflicts increase
Solution Approach 1:
The patent segments the frequency spectrum into multiple interlaces (first interlace and second interlace) and assigns different UEs to different interlaces for COT reservations. This segmentation allows multiple UEs to reserve COT resources simultaneously without interference, as each UE operates on a dedicated frequency interlace. The segmentation resolves the contradiction by enabling higher resource utilization through parallel reservations while preventing interference through frequency isolation.
2Productivity
If multiple UEs reserve COT resources simultaneously, then communication efficiency is improved, but resource conflicts increase
Solution Approach 1:
The patent assigns different local frequency qualities (different interlaces) to different UEs for COT reservations. Each UE is granted exclusive access to its assigned interlace during its COT period, creating localized frequency domains with unique characteristics. This local quality differentiation enables multiple UEs to operate simultaneously with high efficiency while avoiding resource conflicts through spatial-frequency isolation.
3Use of energy by moving object
If UEs use the same frequency resources for COT reservations, then frequency efficiency is improved, but interference between UEs increases
Solution Approach 1:
The patent transitions from one-dimensional time-based COT reservations to two-dimensional time-frequency COT reservations by introducing the interlace dimension. UEs are allocated specific frequency interlaces in addition to time slots, creating a two-dimensional resource allocation space. This dimensional expansion allows the system to maintain frequency efficiency through structured spectrum usage while eliminating interference through frequency separation in the additional dimension.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances resource utilization and reduces interference by enabling efficient sidelink communication scheduling and conflict avoidance in unlicensed spectra.
Implementation Method 1
using frequency division multiplexing (FDM) channel access, or transmitting a communication, via the one or more slots associated with the first COT resource, using a different interlace than an interlace that is associated with the first COT resource
Data Source
AI summary
In some aspects, a user equipment (UE) may receive, via a sidelink communication, an indication that another UE has reserved a first channel occupancy time (COT) resource of a plurality of COT resources. The UE may reserve a second COT resource of the plurality of COT resources via one or more slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or transmit a communication, via the one or more slots associated with the first COT resource, using a different interlace than an interlace that is associated with the first COT resource. Numerous other aspects are described.