Inter-UE Coordination via On-Demand Sensing for V2X Resource Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in inter-UE coordination, particularly in resource selection for vehicle-to-everything (V2X) communications, due to the hidden terminal problem and half-duplex issues, which lead to resource conflicts and inefficiencies in mode 2 of the 3GPP Release 16 standard.
Innovation Solution
The implementation of inter-UE coordination (IUC) in mode 2 of the 3GPP Release 17 standard, where a UE can assist other UEs in resource selection through on-demand sensing and signaling via a PC5 link, using types A, B, and C of inter-UE coordination, and various subscription models to mitigate resource conflicts and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensing-based resource selection is used in mode 2, then UEs can autonomously select resources without network coverage, but resource conflicts and collisions occur due to hidden terminal problem and half-duplex issues
Solution Approach 1:
The patent introduces a coordinating UE as an intermediary that mediates resource selection between transmitting and receiving UEs. The coordinating UE performs sensing on behalf of other UEs and provides resource selection assistance information, acting as a mediator to resolve the hidden terminal problem and reduce collisions without requiring continuous network coverage.
Solution Approach 2:
The patent implements preliminary sensing and resource evaluation by the coordinating UE before actual transmission. The coordinating UE performs sensing in advance, identifies suitable resources, and provides resource selection assistance information to transmitting UEs, allowing them to make informed resource selections before transmission occurs, thereby reducing collisions.
2Reliability
If UEs perform continuous sensing for resource selection, then resource conflicts are reduced, but power consumption and processing complexity increase
Solution Approach 1:
The patent implements partial sensing where the coordinating UE performs sensing instead of all UEs performing full sensing. The sensing scope is partially distributed to the coordinating UE, which provides resource selection assistance information to multiple UEs, reducing the overall sensing burden and power consumption while maintaining resource selection accuracy.
Solution Approach 2:
The coordinating UE performs multiple functions: it acts as a receiving UE for certain transmissions, performs sensing, generates resource selection assistance information, and serves multiple transmitting UEs simultaneously. This multi-functionality reduces redundant sensing operations and lowers overall power consumption in the system.
3Reliability
If inter-UE coordination is implemented to reduce collisions, then resource allocation reliability improves, but signaling overhead and system complexity increase
Solution Approach 1:
The patent extracts the sensing and resource evaluation functions from individual transmitting UEs and concentrates them in a coordinating UE. This extraction reduces the coordination signaling complexity by having a single coordinating UE perform sensing and generate assistance information, rather than requiring complex interactions between multiple UEs.
Solution Approach 2:
The coordinating UE creates resource selection assistance information that represents the sensing results and resource availability. This copied information is then distributed to multiple transmitting UEs, allowing them to make informed decisions without each UE needing to perform its own complex sensing and coordination procedures.
Data Source
AI summary
Disclosed are embodiments for a request and response signaling between first and second user equipment (UE) via a PC5 link for configuring inter-UE coordination. In some embodiments, request signaling entails a first UE identifying a transmit resource pool of the first UE to be sensed or evaluated by the second UE; instructing the second UE to report information indicating a quantity of resources; and instructing the second UE to evaluate the resources to be reported. In other embodiments, response signaling entails a first UE receiving from the second UE a request signal for inter-UE coordination; indicating a set of one or more resources, in which the set is indicated as corresponding to whitelist, blacklist, or collision list; and providing a validity time for resources indicated.