Wireless Message Flooding via Selective NACK Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently flooding messages to all network nodes without unnecessary retransmissions, particularly in device-to-device communication, where resource utilization and latency are critical.
Innovation Solution
A method involving the use of specific common channels for message flooding, where nodes check reception of a flooding message and respond with ACK or NACK signals, allowing retransmissions only upon explicit request and canceling them if not detected, thereby minimizing collisions and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message flooding is performed without explicit retransmission requests, then message delivery reliability is improved, but resource utilization deteriorates due to unnecessary retransmissions
Solution Approach 1:
The patent implements a feedback mechanism where receiving nodes send NACK signals to transmitting nodes when message reception fails. This feedback loop allows the transmitting node to identify which nodes require retransmission and send targeted retransmission messages only to those nodes, avoiding unnecessary retransmissions to nodes that successfully received the original message.
Solution Approach 2:
Instead of performing complete retransmissions to all nodes regardless of actual reception status, the patent applies partial action by sending retransmission messages only to the subset of nodes that explicitly requested them through NACK signals. This reduces the excessive action of universal retransmission while maintaining sufficient coverage for nodes that actually need the message.
2Speed
If all nodes retransmit messages automatically, then message flooding speed is improved, but device complexity increases due to collision management requirements
Solution Approach 1:
The patent applies preliminary action by having nodes prepare their retransmission status in advance through the NACK signal mechanism. Before actual retransmission occurs, nodes signal their reception status, allowing the transmitting node to pre-plan which nodes will receive retransmission messages. This eliminates the need for complex real-time collision detection and management during the retransmission process.
Solution Approach 2:
The NACK signal provides feedback information that simplifies the retransmission process. Instead of nodes needing to complexly coordinate their retransmission timing to avoid collisions, the feedback mechanism allows the transmitting node to simply send retransmission messages to specific identified nodes, greatly reducing the complexity of collision management.
3Productivity
If retransmission is performed without detection, then productivity is improved, but loss of time increases due to undetected transmission failures
Solution Approach 1:
The patent uses feedback signals (NACK) to detect transmission failures at the node level. When a node fails to receive the original message, it sends a NACK signal back to the transmitting node, enabling detection of transmission failures without requiring complex centralized monitoring. This feedback mechanism allows for timely detection and correction of transmission issues.
Solution Approach 2:
The receiving nodes perform self-detection of message reception status and autonomously generate NACK signals when failures occur. This self-service detection mechanism eliminates the need for external monitoring systems, allowing nodes to detect and report their own reception status efficiently, thereby detecting transmission failures without significant time loss.
Data Source
AI summary
The present disclosure relates to a method for message flooding in a wireless communication system, and is characterized in that it includes the steps of: broadcasting, by a transmission node, a flooding message to a surrounding node through a first common channel; checking, by a reception node, whether the first common channel has received the flooding message; transmitting, by the reception node, an ACK signal through a second common channel or a NACK signal through a third common channel, based on a result of the check; and determining, by the transmission node, whether the second common channel or the third common channel has detected a signal, to determine whether to re-transmit the flooding message.