Dual-Bearer SCG Measurement Reporting for SpCell Degradation
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Solution Overview
Problem
In wireless communication systems using multi-radio dual connectivity (MR-DC), there is a challenge in reliably reporting secondary cell group (SCG) measurements when the SCG SpCell degrades, leading to potential SCG failures and service disruptions.
Innovation Solution
The system is configured to send SCG measurement reports to both the master node (MN) and the secondary node (SN) via SRB3, even if the SpCell of the SCG begins to degrade, ensuring that the SN is informed of the degradation and can perform necessary handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SCG measurement reports are sent only when SpCell quality is good, then reporting reliability is improved, but responsiveness to degradation is worsened
Solution Approach 1:
The system sends SCG measurement reports to both MN and SN proactively before SpCell degradation becomes severe. By performing the reporting action in advance when conditions are still favorable, the system ensures the SN receives timely information to initiate handover procedures before the degradation leads to service disruption, thus resolving the contradiction between reliability and responsiveness.
2Speed
If SCG measurement reports are sent to both MN and SN, then system responsiveness is improved, but signaling overhead is worsened
Solution Approach 1:
The system applies different reporting strategies for different network nodes based on their specific roles. The SN receives SCG measurement reports directly for immediate handover decisions, while the MN receives reports for overall connection management. This localized differentiation of reporting quality and destination reduces unnecessary signaling while ensuring each node receives the information it specifically needs for its function.
3Measurement precision
If measurement reports are sent via SRB3, then reporting accuracy is improved, but vulnerability to SpCell degradation is worsened
Solution Approach 1:
The system uses the MN as an intermediary for forwarding SCG measurement reports from the UE to the SN when direct transmission via SRB3 is not available or when the SpCell is degrading. The MN receives the reports via SRB1 or SRB2 (which are more reliable under degradation conditions) and then forwards them to the SN, thus maintaining reporting accuracy while bypassing the vulnerability of direct SRB3 transmission over the degrading SpCell.
Data Source
AI summary
Systems and methods for ultra reliable reporting of secondary cell group (SCG) measurements to a secondary node (SN) used in multi-radio dual connectivity (MR-DC) operation that specifically account for the possibility of SCG special cell (SpCell) degradation are disclosed herein. A user equipment (UE) may establish a signaling radio bearer (SRB) 3 with the SN. The UE may then identify that a handover condition (which may be associated with SCG SpCell degradation) for the SCG SpCell is met, and accordingly send an SCG measurement report over each of the SRB3 and an SRB1 between the UE and a master node (MN) used in the MR-DC operation. Such information received at the MN is forwarded to the SN. Accordingly, the reception of SCG measurement reports (to enable handover to a new SpCell by the SN) is not solely dependent messages on the SpCell of the SCG alone (using SRB3), improving reliability.