Inter-UE Coordination in Groupcast Sidelink Transmissions
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Solution Overview
Problem
Current wireless communication systems, particularly in sidelink communications, face challenges in efficient resource allocation and coordination among terminal devices in vehicle-to-everything (V2X) networks, leading to potential collisions and suboptimal resource usage in scenarios like groupcast communications.
Innovation Solution
The implementation of a hybrid automatic repeat request (HARQ) process with feedback mechanisms allows terminal devices to coordinate resource allocation efficiently, enabling them to transmit inter-UE coordination requests and manage monitoring based on acknowledgments, thereby optimizing resource usage and resolving conflicts in sidelink groupcast communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal devices use sidelink communication for groupcast transmissions, then communication efficiency and direct vehicle-to-vehicle connectivity are improved, but resource allocation conflicts and collisions occur leading to suboptimal resource usage
Solution Approach 1:
The patent implements a feedback mechanism where receiving terminal devices send feedback information to the transmitting terminal device about resource allocation status. This feedback loop enables the transmitting device to adjust its resource allocation decisions, thereby resolving conflicts and improving both communication efficiency and resource allocation reliability in sidelink groupcast transmissions.
2Speed
If terminal devices transmit without coordinated resource allocation, then transmission speed and simplicity are improved, but collisions and resource conflicts increase
Solution Approach 1:
The patent employs preliminary action by having terminal devices perform sensing and resource allocation coordination before actual transmission. The transmitting device selects resources based on feedback information received in advance, and receiving devices prepare acknowledgment signals beforehand, enabling collision-free transmissions while maintaining high transmission speed.
3Productivity
If terminal devices implement comprehensive feedback mechanisms for resource coordination, then resource usage optimization is improved, but device complexity and overhead increase
Solution Approach 1:
The patent applies local quality by implementing feedback mechanisms selectively - only for resources that require coordination and only when collision risk is detected. The feedback information structure is optimized to include only essential fields (such as resource indicator and acknowledgment status), reducing overhead while maintaining effective resource allocation optimization.
Data Source
AI summary
Apparatus and method for inter-UE coordination in groupcast transmissions are provided. Solution comprises communicating (400) with a group of apparatuses in a group communication utilising sidelink transmission, where the group of apparatuses comprises a second apparatus configured to coordinate resource allocation for the group communication and at least one other first apparatus: transmitting (402), utilising a designated hybrid automatic repeat request process, an inter-UE coordination request. Positive or negative hybrid automatic repeat request acknowledgements are received (404) from the group of apparatuses in response to transmitting the inter-UE coordination request and monitoring of inter-UE coordination requests of the at least one other first apparatus are monitored (406) based on the received acknowledgements from the at least one other first apparatus