Dual CRC Control Message Validation for False-Alarm Reduction
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Solution Overview
Problem
In wireless communication systems, especially in URLLC, false-alarm events due to residual errors in control information messages are disruptive, leading to interference and delays, as conventional solutions lack effective error detection mechanisms to minimize these events.
Innovation Solution
A transmitting device uses a second CRC word, encoded with a different generator polynomial, to enhance error detection, which is embedded within the control message, allowing the receiving device to autonomously detect its presence without increasing message size, thereby reducing false-alarm rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single CRC word is used for error detection in control messages, then the message size remains small, but false-alarm events occur due to residual errors
Solution Approach 1:
The error detection mechanism is segmented into two independent CRC checks: a first CRC word (e.g., 24 bits) and a second CRC word (e.g., 16 bits). Each CRC word uses a different generator polynomial and checks different aspects of the control message, dividing the error detection task into multiple specialized components that together provide superior false-alarm reduction
Solution Approach 2:
The patent combines two different CRC codes with distinct generator polynomials into a composite error detection scheme. This composite approach leverages the strengths of both CRC polynomials, creating an error detection mechanism that is more robust against residual errors than either individual CRC would be alone
2Productivity
If message size is kept minimal, then transmission efficiency is high, but error detection capability is insufficient to prevent false-alarm events
Solution Approach 1:
The patent applies partial redundancy by using two CRC words of different lengths (e.g., 24 bits and 16 bits) rather than a single longer CRC. This partial approach provides sufficient error detection capability to prevent false-alarm events while keeping the total overhead minimal, achieving the right balance between validation strength and transmission efficiency
3Use of energy by moving object
If blind decoding attempts are reduced to save UE power, then energy consumption decreases, but the ability to detect control messages accurately is compromised
Solution Approach 1:
The dual CRC scheme provides enhanced feedback for validation: the first CRC offers initial error detection while the second CRC provides additional verification. This layered feedback mechanism enables the UE to confidently validate control messages with fewer blind decoding attempts, reducing power consumption while maintaining high detection accuracy
Data Source
AI summary
A transmitting device and a receiving device for reliable reception of control messages such as downlink control information is provided. The transmitting device forms a control message which comprises control information, a first CRC word (W1) and a second CRC word (W2). The control message is sent to the receiving device which obtains a first CRC check outcome based on performing a first CRC check on the control message, and a second CRC check outcome based on performing a second CRC check on the control message. Thereby, more reliable reception of control messages is possible. Furthermore, the present application also relates to corresponding methods and a computer program.