SCI-Based Sidelink Reference Signals for Device Positioning
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Solution Overview
Problem
Existing 5G wireless networks lack efficient methods for device-to-device positioning using sidelink channels, which are crucial for applications like V2X communications and IIoT devices, due to insufficient configuration and resource allocation for sidelink reference signals.
Innovation Solution
Configuring sidelink resources for sidelink reference signals (SL RSP) by repurposing PSSCH/PSCCH resources, using explicit or implicit indication through SCI, and employing bitmaps to allocate dedicated slots and symbols for SL RSP transmission, enabling precise device positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sidelink resources are configured for SL RSP transmission by repurposing PSSCH/PSCCH resources, then device positioning accuracy is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies multi-functionality by enabling PSSCH and PSCCH resources to serve dual purposes: traditional data/control transmission and SL RSP transmission for positioning. Configuration indications in SCI messages dynamically specify whether resources are allocated for data or SL RSP, allowing the same physical channels to fulfill multiple functions without requiring separate dedicated positioning channels.
Solution Approach 2:
The patent changes resource allocation parameters through SCI configuration messages that indicate whether specific time-frequency resources are allocated for SL RSP transmission. By dynamically adjusting the interpretation of resource allocation parameters in SCI, the system can switch between data transmission and positioning signal transmission modes, resolving the contradiction between positioning accuracy and resource complexity.
2Productivity
If explicit or implicit indication through SCI is used to allocate sidelink resources for SL RSP, then resource utilization efficiency is improved, but signaling overhead increases
Solution Approach 1:
The SCI message format is designed to serve multiple functions: it indicates both data resource allocation and SL RSP resource allocation using the same signaling structure. The resource indication fields in SCI can be interpreted differently based on configuration, allowing a single signaling mechanism to handle both data transmission and positioning signal transmission without requiring separate signaling channels.
Solution Approach 2:
The system uses existing SCI messaging infrastructure to self-configure SL RSP resource allocation without requiring additional dedicated positioning signaling channels. The SCI messages carry resource allocation information that devices can interpret based on pre-configured parameters, allowing the signaling system to serve positioning functions using its own existing structure.
3Reliability
If dedicated slots and symbols are allocated for SL RSP transmission using bitmaps, then positioning reliability is improved, but resource flexibility decreases
Solution Approach 1:
The patent uses pre-configured bitmap patterns that define valid SL RSP resource locations in advance. These bitmap configurations are established through higher-layer signaling before actual SL RSP transmission, allowing devices to reliably identify allocated resources without real-time negotiation. The pre-defined bitmap structures ensure consistent resource allocation while maintaining flexibility through configurable parameters.
Solution Approach 2:
While bitmaps provide structured resource allocation for reliability, the system maintains flexibility through dynamic SCI indications that can override or specify particular resource instances within the bitmap framework. The combination of static bitmap configurations and dynamic SCI signaling allows the system to balance reliability (through predefined patterns) with adaptability (through real-time adjustments).
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to configure and use reference signals for positioning in device-to-device communications (e.g., sidelink communications between two UEs). Configuration information can be generated for a device and can indicate sidelink resources in a resource pool configured to be used for a reference signal for positioning. In the time domain, the configuration can be at a slot level or a symbol level. The configured sidelink resources can be indexed in the time domain and the frequency domain. Control information can be transmitted to indicate a next transmission of a reference signal for positioning. This control information can implicitly or explicitly indicate a configured sidelink resource to be used in the next transmission.