ACK/NACK Error Signaling for Wireless Retransmission Control
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Solution Overview
Problem
Wireless communication systems experience inefficiencies due to ACK to NACK (A2N) and NACK to ACK (N2A) errors, leading to unnecessary retransmissions, increased latency, and resource wastage.
Innovation Solution
Implementing mechanisms to detect and correct A2N and N2A errors by adjusting transmit power and signaling for retransmissions, and reporting such events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACK/NACK signals are transmitted at standard power levels, then energy consumption is optimized, but transmission reliability deteriorates due to A2N and N2A errors
Solution Approach 1:
The patent dynamically changes the transmit power parameter for ACK/NACK signals based on detected A2N/N2A error events. When errors are detected, the system transitions from standard power levels to enhanced power levels, thereby improving transmission reliability while managing energy consumption through conditional power adjustment rather than continuous high-power transmission
Solution Approach 2:
The system implements dynamic power adjustment where ACK/NACK transmit power is not fixed but adapts based on real-time detection of acknowledgment errors. The power level changes from a static standard level to a dynamic level that responds to channel conditions and error events, optimizing the trade-off between reliability and energy consumption
2Reliability
If retransmissions are performed for all NACK signals, then data reliability is improved, but communication latency increases due to unnecessary retransmissions
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device detects A2N/N2A errors and sends corrective signaling back to the transmitting device. This feedback allows the transmitter to distinguish between genuine transmission failures requiring retransmission and erroneous NACK/ACK signals, thereby avoiding unnecessary retransmissions and reducing latency while maintaining reliability
Solution Approach 2:
The patent introduces corrective signaling as an intermediary mechanism between the ACK/NACK exchange and the retransmission decision. This intermediary layer provides additional information that mediates the retransmission process, allowing the system to make informed decisions about whether retransmission is actually needed, thus reducing unnecessary delays
3Reliability
If transmit power is increased to prevent A2N/N2A errors, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent changes the transmit power parameter dynamically based on detected error events rather than maintaining a constantly high power level. The system transitions from a static high-power mode to a dynamic power adjustment mode where power is increased only when A2N/N2A errors are detected, thereby improving reliability when needed while minimizing energy loss during normal operation
Solution Approach 2:
The patent applies partial power increase rather than continuous excessive power transmission. Power is elevated above standard levels only partially - specifically when and where A2N/N2A errors occur - rather than applying excessive power universally and continuously, thus achieving the necessary reliability improvement without unnecessary energy consumption
Data Source
AI summary
Aspects of the disclosure are directed to a wireless node configured to detect and respond to acknowledgement-to-negative acknowledgement (A2N) events. In some examples, the wireless node is configured to output a first control signal configured to acknowledge that a first data signal has been obtained, wherein the first control signal is output for transmission at a first transmit power. In some examples, the wireless node is configured to obtain, after outputting the first control signal, first signaling indicative of retransmission of the first data signal and further indicative of a first acknowledgment to negative acknowledgment (A2N) event. In some examples, the wireless node is configured to, after obtaining the first signaling, output corrective signaling indicative of the first A2N event.