Idle State Measurement Reporting for 5G Dual Connection Signaling Reduction
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Solution Overview
Problem
In 5G mobile communication, the transition from LTE to NR in dual connection mode faces challenges with high signaling overhead and data loss due to bearer changes, especially when adding a secondary Node (SN) node based on measurement results, which requires additional RRC signaling and changes in bearer type.
Innovation Solution
A method where a terminal device measures and reports signal quality of cells in an idle or inactive state, using indication information broadcasted by the network to determine target cells meeting specific thresholds, thereby reducing the need for RRC signaling and avoiding data loss by configuring the dual connection mode before establishing a dedicated bearer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device enters non-DC mode first to establish a bearer before adding SN node, then the security activation can be performed, but additional RRC signaling is needed and bearer type change may cause data loss
Solution Approach 1:
The terminal device performs measurement and reports measurement information while in idle or inactive state, before entering connected mode. The network device pre-determines the SN node based on this reported information, so that when the terminal transitions to connected mode, the SN node is already configured and no additional RRC signaling is needed for SN addition, eliminating bearer type changes and potential data loss
Solution Approach 2:
The measurement information reported by the terminal in idle/inactive state serves as an intermediary that allows the network to pre-determine the SN node. This intermediary information enables the network to prepare the dual connection configuration in advance, bridging the gap between security activation requirements and SN node addition without requiring sequential mode transitions
2Reliability
If the terminal device enters non-DC mode first to establish a bearer before adding SN node, then the security activation can be performed, but data loss may occur due to bearer change
Solution Approach 1:
The terminal device performs measurement and reports measurement information while in idle or inactive state, before entering connected mode. The network device pre-determines the SN node based on this reported information, so that when the terminal transitions to connected mode, the SN node is already configured and no additional RRC signaling is needed for SN addition, eliminating bearer type changes and potential data loss
Solution Approach 2:
By determining the SN node in advance based on measurement information reported in idle/inactive state, the network prepares the dual connection configuration before the terminal enters connected mode. This beforehand preparation cushions against potential data loss by ensuring the SN node is ready and no bearer reconfiguration is needed during the transition
3Adaptability or versatility
If additional RRC signaling is used for adding SN node, then the SN node can be added based on measurement results, but signaling overhead increases
Solution Approach 1:
The terminal device performs measurement and reports measurement information while in idle or inactive state, before entering connected mode. The network device pre-determines the SN node based on this reported information, so that when the terminal transitions to connected mode, the SN node is already configured and no additional RRC signaling is needed for SN addition
Solution Approach 2:
The invention extracts the measurement reporting function from the connected mode RRC signaling process and moves it to the idle/inactive state. By taking out the measurement information collection and SN node determination steps from the connected mode flow, the patent eliminates the need for additional RRC signaling overhead while maintaining the ability to add SN nodes based on measurement results
Data Source
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AI summary
Provided are a method for reporting measurement information, a method for configuring a terminal device, and a device. The method for reporting measurement information is applied to a terminal device in an idle state or an inactive state. The method comprises: the terminal device measures the signal quality of at least one cell; the terminal device reports measurement information according to the signal quality of each of the at least one cell. In the embodiments of the present application, the terminal device in an idle state or an inactive state directly measures the signal quality of a cell and reports the measurement information, thereby avoiding operations that the terminal device first enters an active state and then a network device configures an auxiliary network device or an auxiliary serving cell for the terminal device on the basis of the reported measurement result and an established bearer. Time delay can be effectively decreased and signaling overhead can also be reduced.