Radio Link Failure Reporting With Secondary Cell Group Status
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Solution Overview
Problem
Existing wireless communication systems lack adequate failure reporting procedures for secondary cell group (SCG) status in radio link failure (RLF) reports, leading to potential loss of critical SCG measurement information when the master cell group (MCG) or secondary node is suspended or deactivated.
Innovation Solution
A method for a wireless device to store and transmit information related to MCG and SCG failures, including the status of the SCG at the time of RLF, allowing the network node to optimize SCG configuration and determine whether to activate, deactivate, or configure fast MCG link recovery based on the reported information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device transmits MCG failure information via the SCG, then fast MCG recovery can be achieved, but the SCG status may be suspended or deactivated causing loss of critical SCG measurement information
Solution Approach 1:
The wireless device performs preliminary actions by storing SCG measurement information locally before potential SCG suspension or deactivation occurs. This ensures that even if the SCG is suspended or deactivated during failure reporting, the critical measurement information is preserved and can be included in the MCG failure information transmitted via the SCG, thus preventing information loss while maintaining fast recovery capability.
2Use of energy by moving object
If the network node suspends or deactivates the SCG to reduce battery consumption, then energy efficiency is improved, but SCG measurement information may be lost during RLF reporting
Solution Approach 1:
The wireless device stores SCG measurement information locally in advance before the network node suspends or deactivates the SCG. This preliminary storage action ensures that when the SCG is suspended or deactivated for energy saving purposes, the measurement information is already preserved and can be retrieved to include in MCG failure reports, thus preventing information loss while maintaining the energy efficiency benefits of SCG suspension.
3Measurement precision
If the wireless device includes SCG status information in RLF reports, then network configuration accuracy is improved, but the complexity of failure reporting procedures increases
Solution Approach 1:
The patent merges the SCG status information reporting with the existing MCG failure information transmission procedure. By combining these two functions into a single integrated process where the wireless device simultaneously transmits MCG failure information and includes SCG status information in the same failure report, the solution improves measurement precision without significantly increasing procedural complexity, as the device leverages existing transmission mechanisms and storage capabilities.
Data Source
AI summary
A method, system and apparatus are disclosed. A wireless device (WD) configured to communicate with a network node is described. The WD is configured with a dual connectivity (DC) configuration including one or more parameters usable by the WD to communicate using a master cell group (MCG) and a secondary cell group (SCG). The WD is configurable with a fast MCG link recovery configuration and is configured to determine a failure of the MCG has occurred and determine a failure of an MCG recovery procedure has occurred. The WD is further configured to, in response to determining the failure of the MCG recovery procedure has occurred, store information related to a reason for the failure of the MCG recovery procedure and cause transmission of the stored information to the network node.