RMSI-CORESET and SSB Multiplexing for LBT Reliability
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Solution Overview
Problem
In Release 15 of 3GPP new radio (NR) specifications, the non-co-location of Remaining Minimum System Information-Control Resource Set (RMSI-CORESET) with its associated Synchronization Signal Block (SSB) leads to reduced transmission opportunities due to listen-before-talk (LBT) failures, causing gaps in downlink transmissions and potential spectrum access by other devices.
Innovation Solution
Multiplexing RMSI-CORESET adjacent to its associated SSB, allowing for more flexible positioning within the same or adjacent OFDM symbols, thereby increasing transmission opportunities and preventing gaps in downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RMSI-CORESET is non-co-located with SSB, then frequency flexibility is improved, but transmission reliability deteriorates due to LBT failures causing gaps in downlink transmissions
Solution Approach 1:
The patent merges RMSI-CORESET with SSB by co-locating them in the same time-frequency resources. Specifically, the RMSI-CORESET is configured to occupy the same OFDM symbols and subchannels as the associated SSB, ensuring they are transmitted together in a single LBT opportunity. This combining approach eliminates transmission gaps and improves reliability while maintaining frequency flexibility through configurable resource allocation.
2Adaptability or versatility
If RMSI-CORESET is transmitted separately from SSB, then resource allocation flexibility is improved, but spectrum access efficiency deteriorates due to multiple LBT opportunities required
Solution Approach 1:
The patent combines RMSI-CORESET transmission with SSB transmission in the same LBT opportunity. By configuring RMSI-CORESET to be co-located with SSB in time and frequency, the system achieves spectrum access efficiency through a single LBT procedure while maintaining resource allocation flexibility through configurable parameters such as subchannel allocation and OFDM symbol positioning.
3Reliability
If RMSI-CORESET is co-located with SSB, then transmission reliability is improved, but frequency flexibility deteriorates due to constrained positioning options
Solution Approach 1:
The patent implements dynamic frequency flexibility through configurable RMSI-CORESET resource allocation parameters. While RMSI-CORESET is co-located with SSB in time, the frequency resources (subchannels, bandwidth) can be dynamically configured through RRC parameters. This allows the system to adapt frequency positioning based on channel conditions and interference patterns while maintaining reliable co-located transmission.
Solution Approach 2:
The patent utilizes parameter changes to maintain frequency flexibility. Through RRC configuration parameters such as frequencyOffset, subchannelAllocation, and bandwidth, the RMSI-CORESET can be positioned at different frequency locations relative to the SSB. This parameter-based configuration allows frequency adaptation while preserving the reliability benefits of co-located transmission in the same LBT opportunity.
Data Source
AI summary
Embodiments of the present disclosure describe methods and apparatuses for multiplexing control information of discovery reference signals.