Beam Change Instruction Detection Beyond CRC in mmWave DCI
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Solution Overview
Problem
In wireless communication systems, particularly in mmW systems, beam changes between a base station and user equipment can be interfered by cyclic redundancy check (CRC) processes, making it difficult for the user equipment to reliably detect beam change instructions.
Innovation Solution
Implementing a mechanism for the base station to more reliably determine whether the user equipment has detected a beam change instruction by enhancing the communication process to mitigate interference from CRC processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses CRC check to determine UE detection of beam change instruction, then error detection capability is improved, but detection accuracy deteriorates due to false negative indications
Solution Approach 1:
The patent segments the detection mechanism into two independent parts: CRC check for error detection and separate detection indication for accuracy verification. The beam change detection is divided into CRC-based error checking and explicit indication-based confirmation, allowing each to perform its specialized function without interfering with the other.
Solution Approach 2:
The patent introduces an intermediary detection indication mechanism that mediates between the CRC check and the final detection determination. This intermediary layer provides additional verification information that resolves the conflict between relying solely on CRC (which causes false negatives) and needing accurate detection confirmation.
2Ease of operation
If the base station transmits beam change instruction in DCI, then beam switching control is improved, but communication reliability deteriorates due to CRC failure interference
Solution Approach 1:
The patent segments the beam change instruction transmission into control functionality (DCI for beam switching) and reliability verification (separate detection indication). This allows the DCI to maintain its ease of operation for beam switching while the separate indication mechanism ensures communication reliability by providing CRC-independent confirmation.
Solution Approach 2:
The detection indication acts as an intermediary that verifies the successful reception of beam change instructions independently of the CRC check. This intermediary confirmation ensures that beam switching control operations are reliably executed even when CRC fails, preventing false negative determinations.
3Adaptability or versatility
If the system uses standard DCI transmission for beam change instruction, then protocol compatibility is improved, but detection reliability deteriorates due to CRC interference
Solution Approach 1:
The patent segments the detection reliability function from the standard DCI transmission protocol. The standard DCI transmission maintains protocol compatibility while the segmented separate detection indication mechanism provides enhanced reliability by independent verification that does not depend on CRC outcomes.
Solution Approach 2:
The patent implements a multi-functional approach where the detection indication serves multiple purposes: it confirms beam change instruction reception, provides CRC-independent verification, and maintains compatibility with standard DCI transmission. This universal mechanism resolves the conflict between protocol compatibility and detection reliability.
Data Source
Figure 1
Figure 2A~2D
Figure 3
AI summary
In a process of beam change, the base station transmits a beam change instruction to a user equipment to confirm a change from a current beam to another beam. The base station determines to change from a first beam to a second beam. The base station generates a beam change instruction to indicate the determination to change from the first beam to the second beam. The base station transmits, to a UE, the beam change instruction in a downlink control information (DCI). The base station determines whether or not the beam change instruction is detected by the UE.