Sidelink Inter-UE Coordination for Low-Overhead V2X Resource Allocation
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Solution Overview
Problem
Existing inter-UE coordination in sidelink (SL) communications face challenges in efficiently managing resource allocation requests, particularly in terms of latency and overhead, which affect the performance of vehicle-to-everything (V2X) SL communications.
Innovation Solution
A UE requesting assistance in resource allocation can send a request via a physical sidelink feedback channel (PSFCH)-based physical channel, a first sidelink control information (1st SCI) signal, a second SCI signal, or a medium access control (MAC) control element (CE)-based physical data channel, using configured resources and considering quality of service requirements to derive preferred time and frequency resources for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-UE coordination messages are sent frequently to improve resource allocation performance, then communication performance is improved, but latency and overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring resource pools and pre-establishing coordination mechanisms between UEs. Instead of negotiating resources in real-time, UEs are pre-assigned resource pools and coordination rules, allowing them to autonomously select resources without frequent messaging, thus reducing latency while maintaining allocation performance.
Solution Approach 2:
The patent implements partial action by sending coordination messages only when necessary (e.g., when resource conflicts are detected or conditions change), rather than continuously. This selective messaging reduces overhead and latency while maintaining sufficient coordination for performance improvement.
2Reliability
If inter-UE coordination messages are sent frequently to improve resource allocation performance, then communication performance is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts essential coordination information from full coordination messages by identifying and transmitting only the critical parameters needed for resource allocation (e.g., resource pool indicators, conflict resolution bits). This extraction reduces message size and overhead while retaining sufficient information for effective coordination.
Solution Approach 2:
The patent implements partial action by sending coordination messages only when necessary (e.g., when resource conflicts are detected or conditions change), rather than continuously. This selective messaging reduces overhead and latency while maintaining sufficient coordination for performance improvement.
3Adaptability or versatility
If multiple request message formats are supported to meet different QoS requirements, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a unified request message framework that can accommodate different QoS requirements through configurable parameters and optional fields. A single message structure serves multiple purposes (unicast, groupcast, broadcast) and different service types, reducing the need for multiple specialized message formats while maintaining adaptability.
Solution Approach 2:
The patent segments the request message into hierarchical components (mandatory fields, optional fields, QoS-specific parameters) that can be selectively included or excluded based on requirements. This segmentation allows the system to handle simple cases with minimal messages and complex cases with extended messages, managing complexity through modular structure.
Data Source
AI summary
Various examples and schemes pertaining to inter-user equipment (UE) coordination for enhancement of sidelink (SL) communications are described. A first UE transmits a first message via sidelink control information (SCI) signaling to a second UE. In response to the transmitting, the first UE receives a second message from the second UE. Then, the first UE transmits data using a resource derived based on a preferred resource indicated by inter-UE coordination information in the second message.