NR Sidelink Resource Indication Using Time-Boundary Coordination
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Solution Overview
Problem
Existing 3GPP 5G and NR networks face challenges in efficiently coordinating sidelink resource allocation between user equipments (UEs) for V2X communication, particularly in Mode 2, leading to potential delays and inefficiencies in resource selection and transmission.
Innovation Solution
A method and apparatus for UE coordination, where one UE determines a time boundary based on received coordination information and transmits signaling indicating a set of resources before this boundary, ensuring timely resource allocation and selection, even in Mode 2 scenarios, with support for both Mode 1 and Mode 2 operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE transmits signaling indicating a set of resources after determining resources in Mode 2 sidelink allocation, then resource allocation flexibility is improved, but transmission timing synchronization and resource selection efficiency deteriorate due to lack of coordinated timing reference
Solution Approach 1:
The coordinating UE determines a time boundary for resource selection based on coordination information before the actual resource selection and transmission occur. This preliminary timing reference allows the target UE to prepare and transmit resource indication signaling at the correct time, avoiding delays while maintaining Mode 2 flexibility
Solution Approach 2:
The target UE provides feedback to the coordinating UE by transmitting signaling that indicates the determined set of resources. This feedback mechanism enables the coordinating UE to know which resources were selected, allowing for coordinated resource management while maintaining the autonomous Mode 2 operation
2Speed
If UE autonomously selects resources in Mode 2 without coordination, then resource selection speed is improved, but resource allocation efficiency and collision avoidance deteriorate
Solution Approach 1:
Coordination information acts as an intermediary between UEs in Mode 2 resource allocation. The coordinating UE provides timing references and resource pool information, enabling autonomous yet coordinated resource selection that maintains speed while improving efficiency through shared awareness
Solution Approach 2:
Each UE autonomously determines its resource selection window and selects resources independently based on coordination information received from other UEs. This self-service approach maintains the speed benefits of Mode 2 while the coordination information enables more efficient resource utilization through distributed coordination
3Ease of operation
If UE determines resource selection window without time boundary reference, then resource selection autonomy is improved, but timing synchronization and resource alignment deteriorate
Solution Approach 1:
The time boundary for resource selection is determined in advance based on coordination information from other UEs. This preliminary determination of the resource selection window timing provides a reference that maintains autonomy while ensuring synchronization with the coordinated resource pool
Solution Approach 2:
UEs exchange coordination information that includes timing references and resource pool parameters. This feedback loop enables each UE to autonomously determine its resource selection window with proper timing alignment, maintaining both autonomy and synchronization reliability
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for indicating a set of resources on a new radio (NR) sidelink under 3GPP (3rd Generation Partnership Project) 5G system. According to an embodiment of the present disclosure, a method includes: receiving coordination information from another UE; determining a time boundary in time domain based on the coordination information; and in response to successfully determining a set of resources in at least one domain of time and frequency domains and in response to successfully determining a resource in the time and frequency domains, transmitting, to the abovementioned another UE, signaling on the resource before the time boundary, wherein the signaling indicates the set of resources.