Relay Transmission HARQ-ACK Monitoring for BLER-Aware Channel Switching
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in data transmission due to higher Block Error Rates (BLER) on direct links between source and remote nodes, leading to increased data retransmissions and reduced spectrum utilization.
Innovation Solution
A method involving monitoring Hybrid Automatic Repeat reQuest (HARQ)-ACK on channel sets, using the number of continuous HARQ Discontinuous Transmissions (DTXs) to determine channel thresholds for data retransmission, and adjusting radio bearers and HARQ-ACK monitoring based on these thresholds to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is performed through a relay node, then transmission reliability is improved, but transmission efficiency deteriorates due to increased retransmissions
Solution Approach 1:
The patent dynamically switches between relay transmission mode and direct transmission mode based on real-time channel quality assessment. When direct link quality exceeds a threshold, the system transitions to direct transmission to improve efficiency; when quality deteriorates, it switches back to relay transmission to maintain reliability, thus dynamically optimizing the contradiction between these two modes
Solution Approach 2:
The system changes the transmission mode parameter based on channel quality conditions. By monitoring BLER values and switching between relay and direct transmission modes according to channel quality thresholds, the system adapts the transmission parameter to resolve the contradiction between reliability and efficiency under different network conditions
2Measurement precision
If HARQ-ACK monitoring is performed on all channels, then link quality detection accuracy is improved, but signaling overhead increases
Solution Approach 1:
Instead of monitoring HARQ-ACK on all channels, the patent implements partial monitoring by only monitoring channels where DTX count is less than a threshold. This partial action approach reduces signaling overhead while maintaining sufficient link quality detection accuracy for effective transmission mode selection
Solution Approach 2:
The patent extracts and monitors only the essential HARQ-ACK information from among all channels. By identifying and monitoring only the critical channels (where DTX < threshold), the system extracts sufficient link quality information without the overhead of monitoring all channels, thus resolving the contradiction between measurement precision and information loss
3Productivity
If direct link transmission is used, then transmission efficiency is improved, but BLER increases
Solution Approach 1:
The patent uses HARQ-ACK feedback mechanisms to continuously monitor transmission quality on direct links. When BLER exceeds a threshold or HARQ-ACK indicates failures, the system receives feedback and switches to relay transmission mode, creating a closed-loop control that resolves the contradiction between efficiency and reliability through adaptive feedback-driven mode selection
Data Source
AI summary
A first node transmits a first physical-layer signaling and a first Medium Access Control (MAC) Protocol Data Unit (PDU) via an air interface. The first MAC PDU comprises a first MAC header and a first MAC Service Data Unit (SDU). The first node monitors a first Hybrid Automatic Repeat reQuest Acknowledgment (HARQ-ACK) on each channel in a first channel set, and the first HARQ-ACK indicates whether the first MAC PDU is correctly decoded. The first physical-layer signaling comprises scheduling information of the first MAC PDU. The first channel set comprises Q channel(s), Q being a non-negative integer. The condition of whether a number of continuous HARQ DTXs reaches a first threshold is used to determine Q. The first MAC SDU is transmitted through a first radio bearer, and the first radio bearer is unrelated to whether the number of the continuous HARQ DTXs reaches the first threshold.