Make-Before-Break Handover for Latency-Sensitive Wireless Services
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving zero or minimal interruption time during handover operations in dual connectivity scenarios, which is crucial for maintaining seamless service, especially for latency-sensitive services like URLLC.
Innovation Solution
The implementation of a make-before-break (MBB) handover method, where user equipment (UE) maintains connections with both the source and target network entities, allowing for a seamless transition by continuing to communicate via established data radio bearers (DRBs) until the source connection is released, thereby minimizing latency and interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional handover operations are used, then the handover process is simpler, but interruption time and latency increase during the transition
Solution Approach 1:
The patent applies preliminary action by establishing the connection with the target network entity before breaking the connection with the source network entity. The UE is configured with dual connectivity to both source and target entities simultaneously, allowing data transmission to continue through the target entity while the source connection is still active, thereby eliminating handover interruption time
Solution Approach 2:
The patent uses an intermediary approach by maintaining both source and target network entity connections during the transition period. The UE acts as an intermediary that can route data through either entity, allowing seamless transition without interruption by keeping both communication paths active simultaneously
2Reliability
If connection with source network entity is maintained during handover, then service continuity is improved, but connection management complexity increases
Solution Approach 1:
The patent applies universality by designing the UE with multi-functionality to handle dual connectivity simultaneously. The UE can maintain active connections with both source and target network entities, managing multiple data radio bearers and routing data through either entity based on current network conditions, thereby ensuring service continuity while handling the complexity through unified multi-functional architecture
3Speed
If data transmission continues via source network entity during handover, then latency is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent applies dynamics by enabling flexible and dynamic resource allocation during handover. The UE can dynamically switch data transmission between source and target network entities based on real-time network conditions, maintaining high data transmission speed by keeping the source connection active while gradually transitioning resources to the target entity
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to performing a handover on a per-data radio bearer (DRB) basis. In some examples, the disclosure is directed to indicating, to a source network entity, a make-before-break (MBB) handover capability of the UE, the MBB handover capability supporting MBB handovers for one or more DRBs identified by the source network entity. In some examples, the disclosure describes receiving, from the source network entity, configuration information for a handover from the source network entity to a target network entity, the configuration information identifying the one or more DRBs supported for the MBB handover.