UE CGI Reading via SMTC Configuration in 5G NR
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR networks, determining the Cell Global Identity (CGI) of a target cell is challenging due to ambiguities in SIB1 reading, especially when SSB and CORESET multiplexing patterns 2/3 are used, as the UE needs to decode SIB1 before identifying the SSB period, creating a deadlock in implementation.
Innovation Solution
The solution involves configuring SMTC by the serving cell to the UE for target cell detection, allowing the UE to interrupt connections and use SMTC duration or MIB repetition periodicity to assume SIB1 repetition periodicity, enabling CGI reading without prior SIB1 decoding, and providing default periodicities for SIB1 and MIB reading in various multiplexing patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE decodes SIB1 to read CGI information, then the CGI can be obtained, but the UE cannot decode SIB1 without knowing the SSB period first, creating a deadlock
Solution Approach 1:
The patent applies preliminary action by having the UE acquire SSB period information through SMTC configuration or MIB repetition periodicity before attempting to decode SIB1. This preliminary knowledge of the SSB period allows the UE to determine the correct timing for SIB1 transmissions without being in a deadlock situation, enabling successful CGI acquisition.
Solution Approach 2:
The patent introduces an intermediary element - the SMTC configuration or MIB repetition periodicity - that mediates between the UE and the SSB period information. Instead of directly requiring the UE to know the SSB period, the system uses SMTC or MIB as an intermediary carrier that provides the necessary timing information, which then enables SIB1 decoding.
2Reliability
If the UE continuously monitors for SIB1 transmissions, then CGI reading reliability improves, but power consumption and time delay increase
Solution Approach 1:
The patent applies periodic action by having the UE monitor SIB1 transmissions at specific periodic intervals determined by the SSB period and SIB1 repetition periodicity. Instead of continuous monitoring, the UE only needs to check at predetermined time points when SIB1 is expected to be transmitted, significantly reducing time loss and power consumption while maintaining reliable CGI acquisition.
Solution Approach 2:
The system enables self-service by allowing the UE to autonomously determine the SIB1 monitoring timing based on SMTC configuration or MIB repetition periodicity. The UE uses its own acquired information to schedule its monitoring activities, eliminating the need for continuous network assistance or broadcasting, thereby reducing time delay and improving efficiency.
3Measurement precision
If the network provides detailed SIB1 transmission timing information, then UE decoding accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent applies universality by making the SMTC configuration or MIB repetition periodicity serve multiple functions. It not only provides SSB period information for SIB1 decoding timing but also serves as a general timing reference for other cell detection and measurement operations. This multi-functionality reduces the need for separate dedicated signaling for SIB1 timing, thereby reducing signaling overhead while maintaining decoding accuracy.
Data Source
AI summary
Methods and apparatus are provided for a UE to determine a cell global identity (CGI) of a target cell.