RAN Buffering for Multi-USIM UE Data Loss During RRC Release
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Solution Overview
Problem
In wireless communication systems, particularly in those employing multiple universal subscriber identity modules (USIMs), there is a challenge in managing scheduling gaps that lead to downlink data loss when user equipment (UE) transitions between different radio access networks (RANs) or core networks, causing interruptions in data transmission and reducing network efficiency.
Innovation Solution
The implementation of a method where a radio access network (RAN) node buffers downlink data and activates a data buffering timer upon receiving a suspend request from a UE, allowing it to release the RRC connection and trigger the core network to buffer data, thereby minimizing data loss during transitions between different RANs or core networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE transitions between different RANs or core networks to support multi-USIM functionality, then the adaptability and versatility of the UE is improved, but downlink data loss occurs and network efficiency deteriorates
Solution Approach 1:
The RAN node performs preliminary actions by buffering downlink data before the UE actually transitions between RANs. The suspend request triggers immediate data buffering and timer activation, ensuring data is preserved before the connection release occurs, thus preventing data loss during the transition.
Solution Approach 2:
The RAN node acts as an intermediary between the core network and the UE during transitions. It buffers data and manages the suspension/resumption process, mediating the data flow to ensure continuous delivery even when the UE switches between different RANs or core networks.
2Reliability
If the RAN node buffers downlink data and activates a data buffering timer, then downlink data loss is reduced, but the device complexity and operational overhead increase
Solution Approach 1:
The system uses parameter changes, specifically the data buffering timer, to automatically manage the buffering process. The timer parameter controls when buffering starts and stops, providing a simple mechanism to manage complexity without requiring complex control logic.
Solution Approach 2:
The RAN node performs self-service by automatically buffering data and managing the suspension/resumption process based on the suspend request and timer activation. This automated approach reduces the need for complex manual management and intervention.
3Productivity
If the RRC connection is released upon suspend request, then network resources are freed for other users improving productivity, but the UE cannot receive downlink data during the suspended state
Solution Approach 1:
The RAN node performs preliminary data buffering before releasing the RRC connection. This ensures that even though the connection is released and resources are freed, the buffered data is preserved and can be delivered when the UE resumes, maintaining data transmission continuity.
Solution Approach 2:
The buffered data acts as an intermediary, storing data temporarily between the core network and the suspended UE. This intermediary storage mechanism allows the RRC connection to be released while ensuring data is not lost, bridging the gap during the suspended state.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for suspending and resuming user plane downlink data for user equipments (UEs) equipped with multiple universal subscriber identity modules (USIMs).