QCL Parameter Indication in NR-U SSB-SIB1 Association
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Solution Overview
Problem
In New Radio (NR)-based access to unlicensed spectrum (NR-U) systems, determining the Quasi-Co-Located (QCL) relationship between Synchronization Signal Blocks (SSBs) is challenging when an SSB is not associated with System Information Block 1 (SIB1), as existing methods require occupying bits in the SSB-SubcarrierOffset and pdcch-ConfigSIB1 information fields, complicating the indication of the QCL parameter.
Innovation Solution
The network device determines an indication manner for the QCL parameter based on whether the SSB is associated with SIB1, using specific bit configurations in the PBCH fields to indicate the QCL parameter and the frequency-domain position of a second SSB, ensuring correct reception of QCL information by the terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If bits in SSB-SubcarrierOffset and pdcch-ConfigSIB1 information fields are occupied to bear QCL parameter Q, then the QCL relationship can be indicated, but the frequency-domain position indication of second SSB associated with SIB1 is lost when SSB is not associated with SIB1
Solution Approach 1:
The patent applies dynamics by making the indication manner adaptive based on SSB-SIB1 association status. When SSB is associated with SIB1, the QCL parameter Q is indicated using bits in SSB-SubcarrierOffset and pdcch-ConfigSIB1 information fields. When SSB is not associated with SIB1, the indication manner switches to use other available bits to indicate both the frequency-domain position of the second SSB and the QCL parameter, ensuring both functions can be performed without conflict
Solution Approach 2:
The patent changes the parameter configuration dynamically based on the association relationship. The bit field allocation and indication manner are adjusted according to whether the SSB is associated with SIB1, allowing the system to switch between different indication schemes to accommodate both QCL parameter indication and frequency-domain position indication requirements
2Ease of operation
If a unified indication manner is used for QCL parameter regardless of SSB-SIB1 association, then the indication process is simplified, but the terminal device cannot correctly receive QCL parameter when SSB is not associated with SIB1 due to bit field conflicts
Solution Approach 1:
The patent implements a dynamic indication mechanism where the network device determines the appropriate indication manner based on the SSB-SIB1 association relationship. This dynamic approach ensures that when SSB is not associated with SIB1, the terminal device can correctly identify and receive the QCL parameter without bit field conflicts, while maintaining a relatively simple overall process through clear conditional logic
Data Source
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AI summary
Provided are a wireless communication method, a network device, and a terminal device. The network device may indicate a Quasi-Co-Located (QCL) parameter in different indication manners according to whether a Synchronization Signal Block (SSB) is associated with System Information Block 1 (SIB1), which is favorable for ensuring that the terminal device correctly receives QCL indication information. The method includes that: a network device determines SIB1 association indication information of a first SSB, the SIB1 association indication information being configured to indicate whether the first SSB is associated with SIB1; the network device determines whether the first SSB bears indication information of a QCL parameter and/or an indication manner for the QCL parameter in the first SSB based on whether the first SSB is associated with SIB1; and the network device sends the first SSB.