Relay Node Downlink Retransmission via Segmentation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in downlink retransmissions by relay nodes, particularly due to the need for end-to-end retransmissions of payloads when a second wireless node fails to receive a communication, which results in significant overhead and latency.
Innovation Solution
Implementing a method where a relay node autonomously determines or receives an indication of a second wireless node's failure to receive a communication and retransmits the payload, reducing the need for end-to-end retransmissions by buffering and retransmitting the communication based on feedback or capability modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If end-to-end retransmission is performed when a second wireless node fails to receive a communication, then reliability is improved, but overhead and latency increase significantly
Solution Approach 1:
The patent segments the retransmission process by introducing an intermediate relay node that handles local retransmissions independently. Instead of a single end-to-end retransmission from the first wireless node to the second wireless node, the communication path is divided into segments: the relay node receives the original communication, detects failures, and performs localized retransmissions to the second wireless node, thereby reducing the latency of full end-to-end retransmissions while maintaining reliability.
Solution Approach 2:
The relay node acts as an intermediary between the first wireless node and the second wireless node. It monitors the reception status of communications, detects when the second wireless node fails to receive a communication, and autonomously initiates retransmissions. This intermediary function eliminates the need for the first wireless node to perform lengthy end-to-end retransmissions, thus reducing latency while ensuring reliable delivery.
2Reliability
If end-to-end retransmission is performed when a second wireless node fails to receive a communication, then reliability is improved, but overhead increases significantly
Solution Approach 1:
The relay node segments the communication and retransmission processes, handling local retransmissions independently. This segmentation prevents the need for repeated end-to-end retransmissions of the entire payload from the first wireless node, thereby reducing the quantity of data transmitted overhead while maintaining reliable delivery through localized retry mechanisms.
Solution Approach 2:
The relay node serves as an intermediary that absorbs the retransmission overhead locally. By monitoring reception status and autonomously retransmitting failed communications to the second wireless node, the relay node prevents the first wireless node from incurring the overhead of multiple end-to-end retransmissions, thus reducing overall system overhead while ensuring reliability.
3Productivity
If the relay node autonomously manages retransmissions based on feedback, then productivity is improved, but device complexity increases
Solution Approach 1:
The relay node implements a feedback mechanism where the second wireless node sends reception status information (ACK/NACK) to the relay node. Based on this feedback, the relay node autonomously determines whether retransmission is needed and executes the retransmission. This feedback-driven approach improves throughput by enabling efficient local retransmissions without requiring complex end-to-end retransmission protocols, balancing productivity gains with manageable device complexity.
Solution Approach 2:
The relay node performs self-service by autonomously monitoring reception status, determining the need for retransmission, and executing retransmissions without requiring direct intervention from the first wireless node. This self-service capability improves productivity by enabling rapid local retransmissions while keeping device complexity relatively low, as the relay node uses standard communication protocols and feedback mechanisms already present in the system.
Data Source
AI summary
This disclosure provides systems, methods, and apparatuses for retransmission of a communication by a relay node based on a failure of a target node to receive the communication. In some aspects, the relay node may determine that the second wireless node has failed to receive the second communication, or an upstream wireless node (such as a distributed unit) may determine that the target node has failed to receive the communication. The relay node may retransmit the communication based on such a determination. In some aspects, the relay node may buffer the communication or information used to generate the communication, and may retransmit the buffered communication. In some aspects, a configuration for the retransmission may be modified based on a capability of the relay node or another concern.