CRC-Masked Control Information for Fast UE Identification in 5G
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Solution Overview
Problem
Existing 5G communication systems face challenges in efficiently transmitting control information with high reliability and low latency, particularly for services like URLLC, due to varying channel and interference characteristics, and lack effective methods for identifying and decoding control information from specific user equipment in wireless communication systems.
Innovation Solution
The solution involves adding cyclic redundancy check (CRC) bits to control information and masking some of these bits with identifiers of the receiving user equipment or transmitting device, enabling accurate identification and decoding of control information, including downlink control information (DCI) or sidelink control information (SCI), in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is transmitted without user identification masking, then transmission complexity is reduced, but reliability of control information delivery to specific users deteriorates
Solution Approach 1:
The patent extracts the user identification function from the control information payload and implements it through CRC masking. Specifically, the RNTI (Radio Network Temporary Identifier) is used to mask the CRC bits, allowing the receiver to identify intended control information without adding complex identification fields to the control message structure itself.
Solution Approach 2:
The patent merges the error detection function (CRC) with the user identification function by using the same CRC bits that are masked with the RNTI. This combination allows a single CRC check to simultaneously verify data integrity and identify the intended recipient, eliminating the need for separate identification mechanisms.
2Measurement precision
If CRC masking with user identifiers is implemented, then user identification accuracy improves, but processing time increases
Solution Approach 1:
The patent implements self-service by having each user equipment (UE) independently calculate and compare CRC values using its own RNTI. The intended recipient can quickly identify its control information by performing a simple XOR operation between the received CRC and its RNTI, then comparing with the calculated CRC, without requiring centralized identification or complex matching processes.
3Reliability
If full CRC masking is applied to all control information, then reliability is maximized, but overhead increases
Solution Approach 1:
The patent applies partial masking by using only a portion of the RNTI (specifically 16 bits) to mask the CRC bits, rather than using the full RNTI length. This partial application provides sufficient user identification capability while minimizing the overhead added to the control information structure.
Data Source
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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).