Sidelink Resource Allocation Using Interlace-Based SCI Signaling
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Solution Overview
Problem
Existing sidelink communication methods are limited in flexibility and efficiency when applied to unlicensed spectrum, hindering effective communication in fifth-generation cellular systems.
Innovation Solution
A user equipment and base station system that determines the size of frequency resource assignments based on interlace parameters within a sidelink bandwidth part, enabling efficient allocation of frequency domain resources for sidelink communication over unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing sidelink communication methods are applied to unlicensed spectrum, then communication can be established, but flexibility and efficiency are limited
Solution Approach 1:
The patent changes the parameter of frequency resource assignment by introducing interlace-based allocation instead of traditional contiguous resource block allocation. This allows the system to adapt to unlicensed spectrum requirements while maintaining efficient resource utilization. The frequency resource assignment field now indicates interlace indices and offsets rather than continuous resource blocks, providing flexibility for listen-before-talk procedures and coexistence with other systems.
Solution Approach 2:
The patent segments the frequency resources into multiple interlaces, where each interlace consists of non-contiguous resource blocks distributed across the bandwidth. This segmentation allows for more flexible resource allocation and better adaptation to unlicensed spectrum conditions, enabling the system to skip certain resources for listen-before-talk while utilizing others for data transmission.
2Productivity
If existing sidelink communication methods are applied to unlicensed spectrum, then communication can be established, but efficiency is limited
Solution Approach 1:
The patent modifies the frequency resource assignment parameters to include interlace index and offset information instead of traditional resource block assignments. This parameter change enables more efficient resource utilization in unlicensed spectrum by allowing selective access to different interlaces based on channel conditions and listen-before-talk outcomes, thereby improving communication efficiency.
Solution Approach 2:
The patent introduces dynamic interlace-based resource allocation where the specific resources used can vary based on channel access success and traffic requirements. The frequency resource assignment field dynamically indicates which interlaces and offsets are being used, allowing the system to adapt efficiently to changing unlicensed spectrum conditions while maintaining manageable complexity through standardized signaling formats.
3Adaptability or versatility
If interlace-based frequency resource assignment is implemented, then flexibility and efficiency are improved, but signaling complexity increases
Solution Approach 1:
The patent segments the frequency resources into multiple interlaces and uses compact indexing to represent resource allocations. Instead of signaling individual resource blocks, the system signals interlace indices and offsets, significantly reducing signaling overhead while maintaining the flexibility to allocate resources across the entire bandwidth. This segmentation approach allows efficient representation of complex resource patterns with minimal signaling.
Solution Approach 2:
The patent uses partial signaling by only indicating the necessary interlace index and offset information rather than fully specifying each resource allocation. This partial action approach provides sufficient information for the receiving device to determine the actual resources while minimizing signaling overhead, achieving a balance between flexibility and signaling efficiency.
Data Source
AI summary
A method by a user equipment (UE) is described. The method includes receiving a sidelink (SL) resource pool configuration included in a pre-configuration or from a base station, the SL resource pool configuration indicating a SL resource pool in a SL bandwidth part (BWP), the SL resource pool including a first number of one or more RB sets; and control unit configured to determine a second number of one or more sub-channels at least based on a third number of interlaces and a first parameter, the first parameter indicating a fourth number of interlaces to be included in a sub-channel, and to determine a size of a frequency resource assignment field in a SCI format as (X+Y) bits, X bits providing sub-channel allocation, Y bits providing RB set allocation, wherein a value of the X is determined based on the determined second number, a value of the Y is determined based on the first number.