Multi-SIM UE Mobility Procedure for Power Saving Mode Coordination
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Solution Overview
Problem
Current multi-SIM user equipment (UE) technologies face challenges in efficiently managing multiple subscriptions and network transitions, leading to sub-optimal performance and increased power consumption due to the lack of standardized support for simultaneous multi-SIM operations.
Innovation Solution
The proposed solution involves a method where a multi-SIM UE determines a periodic pattern for performing idle/inactive mode procedures in a second PLMN and communicates this information to the first PLMN, allowing the target network node to schedule the UE accordingly, thereby avoiding collisions and errors during inter-cell handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-SIM UE performs idle/inactive mode procedures in a second PLMN while connected to a first PLMN, then the UE can maintain multiple subscriptions, but network collisions and scheduling errors occur during handovers
Solution Approach 1:
The UE determines and communicates its periodic pattern for idle/inactive mode procedures in the second PLMN to the target network node before the handover is executed. This preliminary communication of timing information allows the network to prepare appropriate scheduling decisions and avoid collisions during the actual handover process.
2Reliability
If the UE continuously monitors both PLMNs, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The UE employs discontinuous reception (DRX) with configured periodic patterns to monitor the second PLMN while remaining connected to the first PLMN. Instead of continuous monitoring, the UE periodically wakes up at predetermined intervals to check for paging messages and system information, then returns to sleep mode, thereby maintaining communication reliability while significantly reducing power consumption.
3Speed
If the UE performs inter-cell handover in the first PLMN, then network mobility is improved, but collisions with idle/inactive procedures in the second PLMN occur
Solution Approach 1:
The UE provides feedback to the target network node about its periodic pattern for idle/inactive mode procedures in the second PLMN. This feedback mechanism enables the network to understand the UE's timing requirements and make informed scheduling decisions that avoid conflicts with the UE's multi-SIM operations, ensuring smooth handover execution without collisions.
Data Source
AI summary
According to some embodiments, a method is performed by a wireless device operating in a first network and a second network. The wireless device is in power saving mode in the second network. The method comprises: determining a first pattern for performing a set of power saving mode procedures in the second network; transmitting a first indication of the determined pattern to a first network node of the first network; receiving a mobility command to perform a mobility procedure from the first network node to a second network node of the first network; performing the mobility procedure to the second network node; and transmitting to the second network node a second indication of a second pattern for performing a set of power saving mode procedures in the second network.