Half-Duplex Resource Exclusion for V2X Packet Repetitions
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Solution Overview
Problem
Half duplex-based communication systems, such as vehicle-to-anything (V2X) networks, face inefficiencies due to packet loss and increased network resource utilization from repetitive transmissions, leading to reduced network throughput and interference.
Innovation Solution
UEs in the network communicate reserved resources for redundancy versions of packets, allowing other UEs to exclude conflicting resources, thereby reducing collisions and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetitions of transmissions are sent to ensure receipt in half duplex systems, then reliability is improved, but network resource utilization increases and throughput decreases
Solution Approach 1:
The patent applies preliminary action by having the transmitting UE indicate reserved resources for future repetitions before actually transmitting them. The UE sends control information specifying which time resources will be reserved for redundancy versions, allowing receiving UEs to exclude these resources from their own transmission schedules in advance, thereby preventing collisions before they occur.
Solution Approach 2:
The patent introduces an intermediary mechanism through control information messages that carry reserved resource indications. This intermediary layer of communication between transmitting and receiving UEs enables coordination without requiring direct simultaneous transmission, allowing the system to manage half-duplex constraints more efficiently and reduce unnecessary repetitions.
2Reliability
If repetitions of transmissions are sent to ensure receipt in half duplex systems, then reliability is improved, but interference in the network increases
Solution Approach 1:
The patent applies preliminary action by having the transmitting UE indicate reserved resources for future repetitions before actually transmitting them. The UE sends control information specifying which time resources will be reserved for redundancy versions, allowing receiving UEs to exclude these resources from their own transmission schedules in advance, thereby preventing collisions before they occur.
3Device complexity
If UEs transmit without coordinating reserved resources, then device complexity is reduced, but resource collisions and packet loss increase
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously manage their own transmission resources by receiving and processing reserved resource indications from other UEs. Each UE independently excludes conflicting resources from its transmission schedule based on control information it receives, eliminating the need for centralized coordination while improving packet receipt reliability.
Data Source
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AI summary
Methods, apparatuses, and computer-readable mediums for wireless communication by a user equipment (UE) includes transmitting a packet on a first resource, determining one or more repetition resources on which to send one or more redundancy versions of the packet, wherein the one or more repetition resources are at a time subsequent to the first resource, transmitting repetition resource information identifying the one or more repetition resources to one or more neighboring UEs, and transmitting the one or more redundancy versions of the packet on respective ones of the one or more repetition resources.