Sidelink Resource Allocation Using DCI Fields for SL-PRS Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in resource and positioning allocation for sidelink communications, particularly in UE-to-UE ranging and orientation determination, which are essential for supporting relative positioning applications across various vertical services.
Innovation Solution
Implementing a method and apparatus for allocating sidelink resources based on field information, where a first field in downlink control information indicates whether resources are allocated for sidelink positioning reference signal (SL-PRS) or physical SL shared channel (PSSCH) transmissions, enabling efficient scheduling of SL-PRS resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sidelink resources are allocated without explicit indication of SL-PRS transmission purpose, then resource allocation flexibility is maintained, but positioning accuracy and QoS awareness deteriorate
Solution Approach 1:
The resource allocation is segmented by purpose: SL-PRS resources are explicitly indicated through a dedicated field in DCI, separating positioning resources from general data resources. This segmentation enables the gNB to track and manage positioning-specific QoS requirements independently, improving positioning accuracy without overwhelming the overall resource allocation system.
Solution Approach 2:
The DCI format is preliminarily configured to include a specific field indicating SL-PRS transmission purpose before actual resource allocation occurs. This preliminary indication allows the UE to prepare for positioning measurements in advance, ensuring that positioning accuracy requirements are met while the gNB can pre-plan resource allocation strategies.
2Productivity
If SL-PRS resources are allocated without explicit indication, then DCI format simplicity is maintained, but QoS awareness and resource efficiency deteriorate
Solution Approach 1:
A dedicated field in the DCI format acts as an intermediary carrier for SL-PRS indication information. This intermediary element enables the gNB to convey positioning resource allocation details and QoS requirements to the UE without complicating the overall DCI structure, thereby improving resource allocation efficiency while preserving critical QoS information.
3Measurement precision
If a field indicating SL-PRS transmission is added to DCI, then positioning resource allocation accuracy is improved, but DCI overhead increases
Solution Approach 1:
The DCI format is designed with multi-functionality, where the added field for SL-PRS indication serves multiple purposes: identifying positioning resources, conveying QoS requirements, and enabling UE-side resource preparation. This universal approach improves positioning resource allocation accuracy while minimizing the increase in DCI information quantity by consolidating multiple functions into a single field.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for allocating resources based on field information. One method (700) includes receiving (702), at a user equipment (“UE”), downlink control information (“DCI”) that allocates sidelink (“SL”) resources. The DCI includes a first field indicating whether the SL resources are allocated for a SL positioning reference signal (“PRS”) (“SL-PRS”) transmission. The method (700) includes, in response to the first field indicating that the SL resources are allocated for the SL-PRS transmission, performing (704) the SL-PRS transmission based at least partly on the DCI. The method (700) includes, in response to the first field indicating (706) that the SL resources are not allocated for the SL-PRS transmission, initiating a physical SL shared channel (“PSSCH”) transmission.