CRC-Masked Control Information for Fast 5G NR User Identification
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Solution Overview
Problem
In 5G wireless communication systems, particularly in NR systems, there is a need for efficient methods to transmit and receive control information to identify users, especially in scenarios requiring high reliability and low latency, such as URLLC services, where existing technologies do not adequately support repetitive transmission modes within a slot or beyond, leading to challenges in detecting control information quickly and reliably.
Innovation Solution
The method involves adding cyclic redundancy check (CRC) bits to control information and masking some of these bits with the identifier of the receiving user equipment (UE) or the transmitting device, allowing for accurate identification and decoding of downlink or sidelink control information, thereby enhancing reliability and latency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is transmitted without user identification masking, then transmission simplicity is maintained, but user identification accuracy and reliability deteriorate
Solution Approach 1:
The patent extracts the user identification function from the control information payload and implements it through CRC masking. Specifically, the identifier bits are separated and used to mask only the CRC portion, allowing the control information to be transmitted with embedded identification capability without requiring separate identification fields or complex signaling mechanisms
Solution Approach 2:
The patent merges the user identification function with the error detection function by using the same CRC bits for both purposes. The identifier bits mask the CRC, so that the CRC serves dual roles: detecting transmission errors and identifying the target user equipment, thereby reducing overall system complexity while improving reliability
2Measurement precision
If full CRC masking with identifier is applied, then user identification accuracy is improved, but processing overhead and latency increase
Solution Approach 1:
The patent applies partial CRC masking rather than masking the entire CRC with the full identifier. Specifically, only a portion of the CRC bits are masked with the identifier bits, which provides sufficient user identification accuracy while reducing the computational complexity and processing time required for CRC calculation and verification compared to full masking
3Reliability
If repetitive transmission modes are implemented for high reliability, then control information detection reliability is improved, but system complexity and resource consumption increase
Solution Approach 1:
The patent enables receiving UEs to self-identify and filter control information intended for them through CRC masking verification. Each UE uses its own identifier to check the masked CRC portion of received control information, automatically determining whether the control information is meant for it without requiring complex scheduling assignments or dedicated signaling, thereby simplifying the overall transmission system while supporting repetitive transmission modes
Data Source
AI summary
The present disclosure relates to a method of transmitting control information for identifying a user in a wireless communication system, and a method, performed by a transmitting device, of transmitting control information includes: adding cyclic redundancy check (CRC) bits to the control information; masking some of the CRC bits with at least one of an identifier of a receiving user equipment (UE) or an identifier of the transmitting device; and transmitting the control information to the receiving UE, wherein the control information includes downlink control information (DCI) or sidelink control information (SCI).