Multi-Modal UE Mobility Through Synchronized Joint Handovers
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring synchronization and seamless mobility for multiple UEs associated with multi-modal services, such as XR and VR, during inter-cell handovers, which can lead to packet delays and service interruptions.
Innovation Solution
Implement network signaling for grouped UEs by introducing common requests and responses between CUs, DUs, and other network entities to manage context modifications and handovers collectively, ensuring synchronized data delivery and resource allocation for multiple UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual handover procedures are executed for each UE separately, then mobility management for each device is precise and controlled, but synchronization between multiple UEs is lost and service interruptions occur
Solution Approach 1:
The patent merges individual handover procedures into a joint handover procedure where multiple UEs are handled collectively. The CU-CP receives handover requests for multiple UEs, coordinates the handover with the target DU, and manages context transfers in a unified manner, thereby maintaining synchronization information across all involved UEs while ensuring reliable handover execution.
Solution Approach 2:
The CU-CP and CU-UP entities are designed to handle both individual UE handovers and joint handovers for multiple UEs. The system maintains universal functionality by supporting separate handover procedures for individual UEs while also enabling coordinated joint handover procedures that maintain synchronization, allowing the network to adapt to different service requirements.
2Reliability
If joint handover procedures are implemented for multiple UEs, then synchronization is maintained and service continuity is improved, but signaling complexity and processing overhead increase
Solution Approach 1:
The joint handover procedure is segmented into distinct functional stages: handover request reception at CU-CP, coordination with target DU, context transfer management, and execution coordination. This segmentation allows the complex joint handover process to be managed through modular, organized steps, reducing signaling complexity while maintaining service continuity.
Solution Approach 2:
The CU-CP acts as an intermediary that coordinates between multiple UEs and the target DU during joint handover. It manages the collective handover requests, coordinates with the target DU, and oversees context transfers, thereby simplifying the overall signaling complexity by centralizing coordination functions rather than requiring direct peer-to-peer signaling between all entities.
3Productivity
If context transfers are performed for each UE individually during handover, then resource allocation is optimized for each device, but data delivery synchronization and resource efficiency deteriorate
Solution Approach 1:
The patent merges context transfer operations for multiple UEs into a unified joint context transfer process. The source CU-UP and target CU-UP exchange context information collectively for all involved UEs in a single coordinated operation, rather than performing separate context transfers for each UE. This approach maintains resource allocation efficiency while preventing data retransmissions and ensuring synchronization, thereby reducing energy loss.
Data Source
AI summary
An apparatus at a CP of a CU associated with a plurality of wireless devices associated with a first multi-modal service configured to output, for a target distributed unit (DU) associated with a joint handover procedure for the plurality of wireless devices, a first request relating to a first context of a first wireless device in the plurality of wireless devices, wherein the first request comprises a first identifier of at least a second wireless device in the plurality of wireless devices associated with the joint handover procedure; and output, for the target DU, a second request relating to a second context of the second wireless device in the plurality of wireless devices, wherein the second request comprises a second identifier of at least the first wireless device.