NR-Light UE Initial Access via SSB Offset Detection
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Solution Overview
Problem
Legacy parameters for initial access may not be detected by reduced capability NR devices (NR-Light UEs) due to their narrow bandwidth, leading to issues with synchronization and access configuration detection.
Innovation Solution
A method for NR-Light UEs to detect synchronization signal blocks (SSBs) and determine subcarrier offset values within specific ranges, using indications in the master information block (MIB) to identify valid access configurations, and if necessary, locate additional SSBs to acquire necessary information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If legacy parameters for initial access are transmitted in a broad bandwidth, then comprehensive access information is provided, but reduced capability NR devices cannot detect these parameters due to their narrow bandwidth
Solution Approach 1:
The patent segments the initial access information by transmitting different SSBs with different subcarrier offset values. Each SSB contains access configuration parameters suitable for specific bandwidth ranges, allowing NR-Light UEs to detect parameters within their narrow bandwidth while legacy UEs can access parameters from SSBs matching their broader bandwidth capabilities
Solution Approach 2:
The patent changes the subcarrier offset parameter in different SSBs to indicate different bandwidth scenarios. By varying the subcarrier offset value, the system enables NR-Light UEs to identify and acquire access configurations appropriate for their narrow bandwidth operation, resolving the detection issue caused by bandwidth mismatch
2Adaptability or versatility
If multiple SSBs are transmitted to cover different bandwidth scenarios, then compatibility with both legacy and reduced capability UEs is improved, but system complexity increases
Solution Approach 1:
The patent makes the SSB transmission system universal by designing SSBs that can serve both legacy UEs and NR-Light UEs. Each SSB contains a subcarrier offset indicator that enables different UE types to interpret the same transmission structure according to their capabilities, achieving multi-functionality without requiring completely separate transmission systems
Solution Approach 2:
The patent performs preliminary action by pre-configuring SSBs with specific subcarrier offset values that correspond to different UE capability scenarios. This allows UEs to quickly identify suitable access configurations without complex real-time negotiations, reducing system complexity while maintaining versatility
Data Source
AI summary
Embodiments of the present application relate to a method and an apparatus for initial access of a user equipment (UE). According to an embodiment of the present application, a method can include: a method may include: detecting, at a first UE, a first synchronization signal block (SSB); determining whether a subcarrier offset value indicated by the first SSB is within a first range or a second range; and determining whether the first SSB has a valid access configuration for the first UE based on an indication in master system information (MIB) of the first SSB. Embodiments of the present application can facilitate the NR-Light UE to detect the initial access parameters, thereby implementation of the initial access procedure for the NR-Light UE.