Dual-CRC Control Message Reception for Lower Blind-Decoding False Alarms
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Solution Overview
Problem
In mobile wireless cellular systems, the high rate of false-alarm events during blind decoding of control information messages leads to errors in data reception and transmission, disrupting ultra-reliable and low-latency communication (URLLC) performance.
Innovation Solution
The introduction of a second CRC word, jointly FEC-encoded with the control packet and transmitted, enhances error detection capabilities. This second CRC word is checked in addition to the conventional first CRC word at the receiver, ensuring the validity of control messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single CRC word is used for error detection in control messages, then the device complexity is low, but the false alarm rate is high which reduces reliability
Solution Approach 1:
The single CRC check is segmented into two independent CRC checks (first CRC and second CRC). Each CRC checks different aspects of the control message, dividing the error detection task into multiple stages to reduce false alarms while maintaining manageable complexity at each stage
Solution Approach 2:
The first CRC acts as an intermediary check between the received control message and the final validation. It performs preliminary error detection before the second CRC check, filtering out obviously erroneous messages and reducing the burden on the final validation stage
2Reliability
If multiple blind decoding attempts are performed for each PDCCH candidate, then the reliability of control message reception improves, but the power consumption increases
Solution Approach 1:
The first CRC check is performed as a preliminary action before the second CRC check. This preliminary validation quickly identifies and discards obviously erroneous control messages, allowing the system to avoid performing full blind decoding attempts for invalid candidates and thus reducing overall power consumption
3Reliability
If the number of DCI sizes is increased to reduce false alarms, then the reliability improves, but the number of blind decoding attempts increases which worsens power consumption
Solution Approach 1:
Instead of increasing the number of DCI sizes, the error detection is segmented into two CRC checks. This approach achieves false alarm reduction through improved validation methodology rather than through brute-force multiplication of decoding attempts, thereby avoiding the associated power consumption increase
Data Source
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AI summary
The invention relates to a transmitting device (100) and a receiving device (300) for reliable reception of control messages such as downlink control information. The transmitting device (100) forms a control message (510) which comprises control information, a first CRC word (W1) and a second CRC word (W2). The control message (510) is sent to the receiving device (300) which obtains a first CRC check outcome based on performing a first CRC check on the control message (510), and a second CRC check outcome based on performing a second CRC check on the control message (510). Thereby, more reliable reception of control messages (510) is possible. Furthermore, the invention also relates to corresponding methods and a computer program.