IAB Node SSB RMSI Periodicity Determination
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Solution Overview
Problem
The existing methods for determining the periodicity of SSB/RMSI for initial access and measurement in IAB nodes differ from those used by Rel-15 UEs, necessitating a solution for determining the appropriate periodicity for effective system performance.
Innovation Solution
The proposed methods involve an IAB node assuming a predetermined or default SSB transmission periodicity for initial access, with options to adjust based on actual periodicity information, frequency band, or signaled values, and allowing for separate periodicities for SSB and RMSI transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If IAB nodes use the same SSB/RMSI periodicity determination methods as Rel-15 UEs, then device complexity is reduced, but system performance and access efficiency deteriorate due to different operational requirements
Solution Approach 1:
The patent applies parameter changes by defining distinct periodicity determination methods for IAB nodes versus Rel-15 UEs. Specifically, it establishes different SSB periodicity values (e.g., 5ms, 10ms, 20ms, 40ms, 80ms, 160ms) and different RMSI periodicity values for IAB nodes compared to traditional UE methods, allowing optimized performance while maintaining separate operational characteristics for each device type
2Adaptability or versatility
If separate periodicities are configured for SSB and RMSI in IAB nodes, then system adaptability improves, but device complexity increases due to additional configuration parameters
Solution Approach 1:
The patent applies segmentation by separating the periodicity configuration into distinct parameters for SSB (synchronization signal block) and RMSI (remaining minimum system information). This allows independent optimization of each signal type's transmission periodicity, enabling the network to separately control synchronization accuracy and system information update frequency without mutual interference
Solution Approach 2:
The patent implements dynamics by allowing flexible configuration of different periodicity values for SSB and RMSI based on network conditions and service requirements. The system can dynamically adjust these parameters to balance between access speed, power consumption, and system information freshness, adapting to varying operational scenarios
Data Source
AI summary
An IAB node performs a method for determining a periodicity of a SSB and/or a RMSI for use in an IAB backhaul link. The method may comprise one or more of: using a predetermined periodicity value; determining a periodicity value based on at least one different parameter; receiving a signaling message indicating a periodicity value and using the indicated periodicity value for the IAB backhaul link; and selecting a periodicity value from a plurality of permitted periodicity values.