NB-IoT Cell Reselection Core Network Data Buffering
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Solution Overview
Problem
Current Narrowband Internet of Things (NB-IoT) networks face challenges in maintaining mobility in connected mode, leading to high power consumption due to frequent handover procedures and potential downlink data loss during cell changes or reselections.
Innovation Solution
A core network device processes data by obtaining an indication message for terminal cell changes or reselections and sends downlink data to a target base station, implementing timers to manage data storage and transmission, ensuring data continuity and reducing storage burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs measurement and measurement result reporting in connected mode to support handover decision-making, then handover capability is improved, but power consumption of the terminal increases
Solution Approach 1:
The core network device performs preliminary actions by pre-configuring measurement parameters and thresholds before the terminal performs measurements. The network device prepares measurement configurations in advance, so when handover is needed, the terminal can quickly report results without extensive processing, reducing power consumption while maintaining handover capability.
2Reliability
If the core network device stores downlink data during cell reselection to prevent data loss, then data continuity is improved, but storage burden increases
Solution Approach 1:
The core network device performs preliminary actions by buffering downlink data before the terminal completes cell reselection. The data is stored in advance in the core network device, and only after the terminal successfully connects to the target base station is the data forwarded. This preliminary buffering ensures data continuity without requiring long-term storage, reducing overall storage burden.
Solution Approach 2:
The core network device acts as an intermediary between the data source and the terminal during cell reselection. It temporarily holds downlink data and forwards it to the target base station after successful handover, mediating the data transfer to ensure continuity while minimizing storage requirements through timely forwarding.
3Productivity
If the core network device sends downlink data to the target base station after cell reselection, then data delivery is improved, but data loss may occur during the transition
Solution Approach 1:
The core network device performs preliminary actions by buffering downlink data before the terminal completes cell reselection. This preliminary storage ensures that data is ready to be sent immediately after handover, improving data delivery while preventing loss during the transition period.
Solution Approach 2:
The core network device maintains continuous data availability by buffering downlink data throughout the cell reselection process. The data remains in the buffer continuously, ensuring uninterrupted delivery to the target base station once handover completes, thereby preventing data loss while maintaining productivity.
Data Source
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AI summary
Embodiments of this application provide a cell obtaining method and a terminal to reduce power consumption of the terminal. Technical solutions provided in the embodiments of this application are as follows: When a terminal is connected to a current source serving cell, the terminal obtains a first quality parameter of the current source serving cell; if the first quality parameter is less than a first preset threshold, the terminal determines a measurement cell set; the terminal measures each measurement cell in the measurement cell set to obtain each corresponding second quality parameter; and the terminal determines a target serving cell based on the second quality parameter.