Sidelink Resource Grid Framework for Unlicensed Spectrum Allocation
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Solution Overview
Problem
The resource allocation frameworks for sidelink communication on unlicensed/shared spectrum (SL-U) are not adequately addressed, given the differences between legacy NR unlicensed (NR-U) and SL frameworks, necessitating a new design to ensure effective operation on unlicensed spectrum.
Innovation Solution
A resource allocation framework is developed for sidelink communication on unlicensed spectrum, involving SL-U component carriers with bandwidth parts divided into resource pools and guard bands, with resource blocks further divided into sets and interlaces, allowing for both contiguous and interlace-based transmissions, and indicated through sub-channels using System Information Block, Radio Resource Control, and MAC Control Elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a new resource allocation framework is designed for SL-U, then resource allocation efficiency and flexibility are improved, but system complexity increases due to multiple division levels (RPs, RB sets, interlaces, sub-channels)
Solution Approach 1:
The patent applies segmentation by dividing the SL-U bandwidth into multiple hierarchical levels: Resource pools (RPs) are first-level divisions, each containing Resource Block (RB) sets as second-level divisions, which are further divided into interlaces and sub-channels. This multi-level segmentation allows efficient resource management and allocation while maintaining systematic organization, resolving the contradiction by structuring complexity in a manageable hierarchical manner.
Solution Approach 2:
The patent implements dynamic resource allocation where the number and configuration of RPs, RB sets, interlaces, and sub-channels can be flexibly adjusted based on transmission requirements. The framework supports both CRB-based and IRB-based transmissions with configurable parameters, enabling the system to adapt dynamically to different service types and channel conditions, thus improving efficiency without being constrained by fixed complex structures.
2Adaptability or versatility
If multiple transmission modes (CRB-based and IRB-based) are supported, then transmission flexibility is improved, but resource allocation complexity increases
Solution Approach 1:
The patent creates a universal resource allocation framework that can handle both Contiguous Resource Block (CRB) based and Interlace Resource Block (IRB) based transmissions through the same hierarchical structure. The framework uses common elements (RPs, RB sets, interlaces, sub-channels) that can be configured differently to support various transmission modes, achieving multi-functionality without requiring separate allocation mechanisms for each mode.
Solution Approach 2:
The patent employs parameter changes to switch between transmission modes by adjusting configuration parameters such as the number of RBs per set, interlace patterns, and sub-channel mappings. By changing these parameters within the unified framework, the system can adapt between CRB-based and IRB-based transmissions, maintaining flexibility while avoiding the need for fundamentally different allocation structures.
3Reliability
If guard bands are inserted between RPs and RB sets, then interference protection is improved, but usable resource bandwidth is reduced
Solution Approach 1:
The patent applies local quality by strategically placing guard bands only where interference protection is most critical - between adjacent resource pools and within RB sets. The guard band placement and width are locally optimized based on the specific resource allocation pattern and interference conditions, providing necessary protection while minimizing the overall impact on usable bandwidth across the entire spectrum.
Data Source
AI summary
A method can include determining a resource allocation framework for sidelink communication, allocating resources in a resource grid for PSCCH, PSSCH, or PSFCH based on the framework, and transmitting at least one sub-channel index and at least one RB set index to indicate resource allocation information of PSCCH, PSSCH, or PSFCH over an SL-U spectrum, wherein the resource allocation framework comprising at least one SL-U CC including an SL-U BWP including X indexed RBs, the SL-U BWP being divided into Y indexed RPs and at least one inter-RP GB when Y being an integer greater than 1, each RP being divided into N indexed RB sets and at least one intra-cell GB when N being an integer greater than 1, K indexed interlaces configured to map the RBs cyclically per BWP, and sub-channels configured to map the interlaces per RB set and cyclically across different RB set per RP.