Inter-RAT Cell Reselection Using SIB Priority and Threshold Data
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Solution Overview
Problem
Current NB-IoT technology lacks support for inter-Radio Access Technology (RAT) mobility, leading to devices being stuck in poor radio conditions and high power consumption during cell selection or reselection, and there is a need for efficient inter-RAT cell selection or reselection processes to improve coverage and power efficiency.
Innovation Solution
Implementing a system information block (SIB) that includes inter-RAT information, allowing devices to perform cell selection or reselection without measurements, using historical data and event triggers, and configuring measurement parameters based on device power sensitivity and coverage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-RAT cell selection or reselection process is implemented, then connectivity and coverage are improved, but power consumption increases
Solution Approach 1:
The network node pre-configures measurement parameters, frequency lists, and priority information in SIB messages before the device needs to perform measurements. This allows the device to have measurement guidelines ready in advance, reducing the time and power needed when actual cell selection or reselection is triggered
Solution Approach 2:
Different measurement parameters and frequency lists are provided for different device types (e.g., high mobility devices vs. power-sensitive devices). The network can tailor the measurement configuration to match specific device characteristics and service requirements, optimizing power consumption for each device category
2Measurement precision
If extensive measurements are performed for inter-RAT cell selection, then cell selection accuracy is improved, but measurement time and processing overhead increase
Solution Approach 1:
The patent extracts and provides only the necessary measurement parameters and frequency information relevant to inter-RAT cell selection in SIB messages. By providing targeted frequency lists and measurement configurations rather than requiring full-spectrum measurements, the device can focus measurements on specific frequencies and cells, improving accuracy while reducing measurement time
Solution Approach 2:
Measurement configurations including frequency lists, priority information, and threshold values are pre-provided by the network in SIB messages. This preliminary provision of measurement parameters allows the device to perform focused measurements rather than exhaustive scanning, reducing measurement time while maintaining selection accuracy
3Adaptability or versatility
If multiple frequency lists and measurement parameters are provided, then inter-RAT mobility support is improved, but signaling overhead increases
Solution Approach 1:
The SIB messages are designed to carry multiple types of information (frequency lists, priority information, measurement parameters, thresholds) in a unified structure that serves multiple purposes. This multi-functional signaling approach provides comprehensive inter-RAT mobility support while consolidating information delivery to reduce overall signaling overhead
Data Source
AI summary
Techniques are described for facilitating an inter-Radio Access Technology (RAT) selection or measurement process for a dual-mode or a multi-mode device. For example, a wireless communication method includes a network node transmitting to a communication node a system information block (SIB) that includes information about Radio Access Technologies (RATs). The information includes any one or more of a first carrier priority value and a first threshold value of a serving frequency associated with a RAT, a second carrier priority value and a second threshold value of a serving cell associated with the RAT, an indicator to indicate existence of one or more additional RATs, carrier information for the one or more additional RATs, and access information to access the one or more additional RATs.