Reduced Capability UE Initial Cell Access via Segmented SIB1
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting user equipment (UE) with reduced capability for maximum bandwidth during initial cell access in 3GPP-based wireless communication systems, as they require distinct system information blocks (SIB1) and scheduling information that differ from those of standard UEs.
Innovation Solution
The method involves a UE receiving a physical broadcast channel (PBCH) signal and system information block 1 (SIB1) scheduling information in a first control resource set (CORESET), with the option to receive a second type of SIB1 that is different from the standard, using specific time or frequency offsets, and transmitting these signals through a physical downlink shared channel (PDSCH), allowing for efficient initial cell access even with reduced capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distinct SIB1 and scheduling information are provided for reduced capability UEs, then initial cell access efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by providing different SIB1 configurations and scheduling information specifically tailored for reduced capability UEs while maintaining standard configurations for regular UEs. The base station transmits multiple SIB1 messages with different parameters (such as different subcarrier spacings, cyclic prefix lengths, and resource allocations) to match different UE capabilities, thereby optimizing initial cell access for each UE type without imposing unnecessary complexity on the system as a whole.
Solution Approach 2:
The patent segments the system information by creating distinct SIB1 messages for different UE types. Instead of using a single unified SIB1 configuration, the system divides the information into multiple segments with different parameters optimized for specific UE capabilities. This segmentation allows reduced capability UEs to efficiently access only the information relevant to their capabilities while standard UEs continue to use the conventional access method.
2Adaptability or versatility
If multiple SIB1 configurations are transmitted, then compatibility with different UE types is improved, but signaling overhead increases
Solution Approach 1:
The patent implements universality by designing a multi-functional SIB1 transmission mechanism that serves both standard UEs and reduced capability UEs through the same base station infrastructure. The base station transmits multiple SIB1 configurations that can be universally received by all UE types, with each UE selecting the appropriate configuration based on its capabilities. This approach enhances compatibility across different UE types while managing signaling overhead through efficient resource allocation and configuration selection.
Data Source
AI summary
A terminal performing initial cell access, according to an embodiment of the present disclosure, receives a PBCH signal through an SSB, receives SIB1-scheduling information for a first CORESET on the basis of the PBCH signal, and receives an SIB1 through a PDSCH, wherein the terminal is a second type terminal with reduced capability to support a maximum bandwidth smaller than that of a first type terminal among different types of terminals supported in a 3GPP-based wireless communication system, and even though the PBCH signal received by the terminal is set to be the same as a PBCH signal received by the first type terminal, the SIB1 received by the terminal may include a second type SIB1 different from a first type SIB1 that the first type terminal receives.