RedCap UE SSB Detection via CORESET Parameter Reinterpretation
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Solution Overview
Problem
Reduced capability user equipment (RedCap UEs) in NR networks face compatibility issues with synchronization signal blocks (SSBs) and control resource sets (CORESETs) configured with 30 kHz subcarrier spacing, as their bandwidth is smaller than that required, leading to difficulties in accessing the network when these configurations are not compatible.
Innovation Solution
The RedCap UEs determine the type of SSB and configure a compatible CORESET by analyzing parameters such as subcarrier spacing, resource blocks, and frequency offsets, allowing them to detect or search for a cell-defining SSB within compatible frequency ranges, even if the initial SSB is not compatible, by reinterpreting broadcast information and adjusting resource configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RedCap UEs use smaller bandwidth to reduce cost and complexity, then device cost and complexity are reduced, but compatibility with SSBs with 30 kHz SCS is lost
Solution Approach 1:
The patent changes the parameter interpretation by redefining what SSB index values represent for RedCap UEs. Specifically, it maps SSB indices to different frequency offsets suitable for RedCap bandwidths, allowing the same SSB configuration to serve both non-RedCap and RedCap UEs with different capability sets
Solution Approach 2:
The patent segments the SSB detection process into two paths: one for non-RedCap UEs that can handle full bandwidth SSBs, and another for RedCap UEs that detect SSBs with frequency offsets within their limited bandwidth. This segmentation allows each UE type to use appropriate detection methods without interfering with the other
2Productivity
If network uses 30 kHz SCS configuration for SSBs, then network performance is improved, but RedCap UEs cannot access the network
Solution Approach 1:
The patent makes the SSB configuration universal by designing it to serve multiple UE types simultaneously. The same SSB transmission can be interpreted differently by non-RedCap UEs (as cell-defining SSBs) and RedCap UEs (as non-cell-defining SSBs with frequency offsets), allowing one configuration to support multiple functions and device categories
Solution Approach 2:
The patent introduces an intermediary interpretation layer where the network transmits SSBs with configurations that act as a mediator between full-capability and reduced-capability UEs. The SSB index and frequency offset information serve as intermediaries that guide RedCap UEs to the correct frequency positions without requiring separate dedicated SSB transmissions
3Use of energy by moving object
If RedCap UEs search for cell-defining SSB with limited bandwidth, then device power consumption is reduced, but detection capability is reduced
Solution Approach 1:
The patent applies preliminary action by having RedCap UEs use information from non-cell-defining SSBs to pre-determine the frequency offsets and search spaces for cell-defining SSBs. This preliminary detection phase allows UEs to narrow down the search area before performing full cell-defining SSB detection, reducing both power consumption and detection difficulty
Data Source
AI summary
The present application relates to methods and apparatus for SSB detection. One embodiment of the present disclosure provides a user equipment (UE), which includes: a processor configured to: determine at least one of a value of a first parameter and a configuration of a first control resource set (CORESET) associated with a first synchronization signal block (SSB); determine a type of the first SSB based on at least one of the value of the first parameter and the configuration of the first CORESET; and determine a cell defining SSB for the UE based on the type of the first SSB; or determine a frequency range for searching the cell defining SSB for the UE based on the type of the first SSB.