Multiplexed Feedback Control Channel for PLC Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in industrial IoT settings, face challenges in achieving low latency and high reliability for data transmission between Programmable Logic Controllers (PLCs) and sensors/actuators, with existing technologies struggling to maintain reliability and reduce latency in control channels.
Innovation Solution
The proposed solution involves a method where a base station receives feedback from a PLC in an uplink control channel, multiplexed with feedback for other devices, and transmits retransmissions of data to ensure reliable communication by utilizing multiplexed feedback in control channels, thereby improving latency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback is transmitted separately in uplink and downlink control channels, then communication reliability is improved, but latency increases due to additional transmission time
Solution Approach 1:
The patent combines uplink control information (UCI) and downlink control information (DCI) into a single control channel transmission. The base station multiplexes both feedback types together, allowing the wireless device to receive both uplink and downlink feedback simultaneously in one reception event, thereby reducing latency while maintaining communication reliability through comprehensive feedback delivery
2Loss of time
If multiplexed feedback is used in control channels, then latency is reduced through simultaneous transmission, but device complexity increases due to multiplexing operations
Solution Approach 1:
The patent introduces a base station as an intermediary that performs the multiplexing of uplink and downlink control information before transmission. This centralizes the complex multiplexing operations at the base station rather than requiring complex multiplexing capabilities at the wireless device, thereby reducing device complexity while still achieving simultaneous feedback transmission and reduced latency
3Reliability
If retransmission is implemented based on multiplexed feedback, then communication reliability reaches 99.9999%, but use of energy increases due to additional transmission activities
Solution Approach 1:
The patent implements a feedback-driven retransmission mechanism where multiplexed control information enables the base station to accurately determine which transmissions require retransmission. By consolidating feedback information, the system can make more informed retransmission decisions, achieving high reliability through targeted retransmissions rather than blanket retransmission strategies, thereby reducing overall energy consumption compared to less efficient feedback mechanisms
Data Source
AI summary
A wireless device, such as a PLC, receives data from at least one wireless device. The wireless device transmits first feedback for the data in a downlink control channel to the at least one wireless device and transmits second feedback for the data in an uplink control channel to a base station. The base station receives the feedback in an uplink control channel and transmits a retransmission of the data to the wireless device in response to receiving the feedback.