Multi-SIM Data Session Shifting During VoLTE Tune-Away
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Solution Overview
Problem
In dual-SIM dual-standby (DSDS) devices with ENDC support, VoLTE calls on one SIM cause frequent RF transceiver tune-aways, leading to RF blackouts and data loss on the second SIM, resulting in low throughput and network resource wastage due to unacknowledged transmissions and retransmissions.
Innovation Solution
The multi-SIM UE identifies VoLTE calls on one SIM and shifts ongoing data sessions to a secondary cell group (SCG) bearer configuration, using UEAssistanceInformation or MAC CE messages to convert split bearers to SCG-only bearers, and sends cumulative ACKs upon tune-back, ensuring data continuity and reducing retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF transceiver is tuned away for VoLTE packets transmission on first SIM, then voice call quality is maintained, but data transmission on second SIM experiences blackouts and data loss
Solution Approach 1:
The patent segments the data transmission path by introducing a relay node that receives data from the network on the first SIM and forwards it to the second SIM. This segmentation allows the RF transceiver to be tuned away for VoLTE without causing complete data loss, as the relay node maintains data availability during tune-away periods.
Solution Approach 2:
The relay node acts as an intermediary between the network and the second SIM. It buffers data during VoLTE tune-away periods and forwards it when the transceiver is available, mediating between the conflicting requirements of voice call quality and data transmission continuity.
2Speed
If RF transceiver frequently tunes away for VoLTE packets, then voice packets are transmitted without delay, but throughput on second SIM is reduced due to retransmissions
Solution Approach 1:
The relay node performs preliminary actions by receiving and buffering data from the network before the transceiver needs to tune away for VoLTE. This preliminary data acquisition ensures that data is ready to be forwarded immediately after tune-away, reducing retransmissions and maintaining throughput.
Solution Approach 2:
The relay node ensures continuity of useful action by maintaining data buffering and forwarding operations continuously, even during VoLTE tune-away periods. This continuous operation prevents interruptions in data transmission to the second SIM, maintaining productivity despite frequent voice call interruptions.
3Device complexity
If LTE transceivers are shared for both VoLTE call and ENDC data session, then device complexity is reduced, but data transmission reliability deteriorates during tune-away periods
Solution Approach 1:
The relay node serves as an intermediary that compensates for the reliability issues caused by shared transceivers. It ensures data transmission reliability during tune-away periods by buffering and forwarding data, allowing the system to maintain simple shared transceiver architecture without sacrificing reliability.
Data Source
AI summary
Embodiments herein disclose a method for managing a data session of a user equipment (UE) including multiple subscriber identity modules (SIMS) in a dual-connectivity wireless network. The method includes identifying, by the UE, initiation of a voice call over a first network on a first SIM of the multiple SIMs while at least one data session is ongoing on the first network associated with a second SIM of the multiple SIMS, the second SIM being connected with the first network and a second network included in the dual-connectivity wireless network. Further, the method includes shifting, by the UE, the at least one data session to the second network associated with the second SIM in response to identifying that the voice call over the first network on the first SIM is initiated, identifying, by the UE, whether the voice call over the first network initiated on the first SIM is ended, and shifting, by the UE, the at least one data session to the first network associated with the second SIM, in response to identifying that the voice call over the first network initiated on the first SIM is ended.