Modified ARQ HARQ Grouping for Wireless Feedback Efficiency
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Solution Overview
Problem
Existing ARQ/HARQ procedures in wireless communication are inefficient, particularly in unlicensed radio frequency bands, due to the need for immediate acknowledgement and the potential for unnecessary retransmissions caused by delayed processing capabilities of user equipment.
Innovation Solution
A modified ARQ/HARQ procedure that organizes messages into predetermined groups, allowing independent transmission without waiting for acknowledgement of previous groups. The receiving device stores acknowledgements until specified by control parameters and triggers their transmission in a single message, including acknowledgements for both initial and retransmitted messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If immediate acknowledgement is required in traditional ARQ/HARQ procedures, then transmission reliability is improved, but network efficiency deteriorates due to unnecessary retransmissions caused by delayed processing
Solution Approach 1:
The patent segments the acknowledgement feedback into two types: immediate acknowledgement for critical messages and delayed acknowledgement for non-critical messages. This segmentation allows the system to maintain transmission reliability for important data while improving network efficiency by avoiding unnecessary immediate retransmissions for less critical data, thus resolving the contradiction between reliability and productivity
Solution Approach 2:
The patent introduces dynamic acknowledgement timing where the acknowledgement delay is adjusted based on message priority, channel conditions, and processing status. High-priority messages receive immediate acknowledgement to ensure reliability, while low-priority messages can tolerate delayed acknowledgement to improve overall network efficiency, making the system adaptive to different operational requirements
2Measurement precision
If wait-and-stop ARQ/HARQ procedure is used, then transmission accuracy is improved, but processing time increases due to waiting for acknowledgements before continuing
Solution Approach 1:
The patent implements preliminary action by allowing the transmitting device to prepare and queue multiple messages in advance based on their priority levels and expected acknowledgement timing. High-priority messages are transmitted immediately with expected immediate acknowledgement, while lower-priority messages are queued for later transmission, eliminating the need to wait for acknowledgements before preparing subsequent messages, thus reducing processing time while maintaining accuracy through selective waiting
3Reliability
If retransmission is performed immediately upon missing acknowledgement, then message delivery reliability is improved, but resource waste increases due to potential unnecessary retransmissions
Solution Approach 1:
The patent applies preliminary anti-action by implementing a timeout mechanism and message priority system that prevents premature retransmissions. Instead of immediately retransmitting upon missing an acknowledgement, the system waits for a predetermined timeout period or checks message priority before initiating retransmission, thereby avoiding unnecessary retransmissions of messages that may have been successfully received, thus reducing resource waste while maintaining delivery reliability
Solution Approach 2:
The patent enables self-service by allowing the receiving device to autonomously determine whether retransmission is necessary based on local processing status and message importance. The receiving device can send a selective acknowledgement indicating whether the message was successfully processed, eliminating the need for the transmitting device to perform blind retransmissions, thus reducing resource waste while maintaining reliability through intelligent, context-aware retransmission decisions
Data Source
AI summary
This disclosure describes implementations of a modified ARQ/HARQ procedure that deviates from normal wait-and-stop ARQ/HARQ procedure. In particular, a series of messages to be transmitted may be organized in a predetermined number of message groups. By using various control parameters, the different groups of messages may be independently transmitted without having to wait for acknowledgement of another group of messages. In addition, within each of the message groups, the receiving device is allowed to store and hold acknowledgement of messages until a later time specified through control messages. A control message may trigger transmission of stored acknowledgement for one or more message groups identified. Multiple pending acknowledgements of multiple groups of messages may be triggered and subsequently transmitted in a single acknowledgement message. The pending acknowledgements may include acknowledgements for successful receipt of both initially transmitted message and retransmitted message.