Multicast Feedback Mechanism for V2X Retransmission Control
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Solution Overview
Problem
In wireless communication systems, particularly in peer-to-peer (D2D) communications like V2X, ensuring quality of service (QoS) without overusing resources is challenging due to concurrent transmissions that prevent devices from receiving and providing feedback, leading to unnecessary retransmissions and resource wastage.
Innovation Solution
A feedback-based retransmission mechanism where nearby devices detect and provide feedback to the transmitting device when another device is unable to receive a transmission, allowing retransmissions only when feedback is received, thereby avoiding blind retransmissions and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind retransmissions are performed without feedback, then reliability of multicast communications is improved, but resource consumption increases and power is wasted
Solution Approach 1:
The patent implements a feedback mechanism where receiving UEs send acknowledgments to transmitting UEs about successful packet reception. This feedback allows the transmitting UE to determine whether retransmissions are necessary, eliminating blind retransmissions and reducing power consumption while maintaining communication reliability.
2Reliability
If retransmissions are performed without feedback, then packet reception reliability is improved, but system resources are wasted
Solution Approach 1:
The patent employs feedback from receiving UEs to inform transmitting UEs about successful packet reception. This enables the system to perform retransmissions only when necessary, optimizing resource utilization while ensuring reliable packet delivery.
3Measurement precision
If feedback is transmitted by receiving devices, then retransmission accuracy is improved, but device complexity increases due to half-duplex constraints
Solution Approach 1:
The patent schedules feedback transmission in advance within predetermined time windows that are coordinated with the transmission timeline. This preliminary scheduling of feedback opportunities simplifies the half-duplex operation by providing clear temporal guidelines for when devices should transmit or receive, reducing the complexity of real-time decision-making.
4Loss of energy
If feedback mechanism is implemented, then unnecessary retransmissions are reduced, but device complexity increases
Solution Approach 1:
The patent pre-configures feedback time windows and transmission schedules, allowing devices to operate with simplified logic based on predetermined timing rather than complex real-time negotiations. This reduces the operational complexity while maintaining energy efficiency through targeted feedback.
5Reliability
If blind retransmissions are performed, then communication reliability is improved, but interference to other transmissions increases
Solution Approach 1:
The patent uses feedback from receiving UEs to determine whether retransmissions are actually needed. By transmitting feedback only when packets are successfully received or when retransmission is necessary, the system reduces unnecessary transmissions that would cause interference to other communications while maintaining reliability.
Data Source
AI summary
Aspects of the present disclosure propose a mechanism whereby a nearby device may detect scenarios where one device is unable to receive communications from a transmitting device. For example, the nearby device may detect that concurrent transmissions of a transmitting device and intended recipient prevent reception by the intended recipient and provide feedback to the transmitting device. Rather than blindly retransmitting, the transmitting device may only retransmit when it receives feedback from the nearby device, saving power and avoiding unnecessary transmissions.