Secondary Node SCG SRB Handover Control
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Solution Overview
Problem
In conventional LTE dual-connectivity (DC) handover procedures, the master node bears a heavy load for radio resource management (RRM) processing, leading to increased signaling overhead and potential data interruption during handovers, as the secondary node lacks independent control and direct communication capabilities.
Innovation Solution
The secondary node is enabled to independently generate RRC protocol data units and configure a dedicated SCG SRB, allowing it to participate in handover management and reduce the RRM load on the master node by directly communicating with the UE and controlling handover procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the master node independently manages handover procedures in conventional LTE DC, then handover control is centralized and simple, but the master node bears heavy RRM processing load and signaling overhead increases
Solution Approach 1:
The patent segments the handover management function by enabling the secondary node to independently generate RRC protocol data units and configure dedicated SCG SRB. This divides the previously centralized master node control into distributed control between master and secondary nodes, reducing the master node's RRM processing load while maintaining coordinated handover management.
2Device complexity
If the secondary node lacks independent control capabilities in conventional LTE DC, then system structure is simple, but handover efficiency decreases and data interruption increases
Solution Approach 1:
The patent implements self-service by enabling the secondary node to independently generate RRC protocol data units and configure dedicated SCG SRB without requiring constant master node intervention. This allows the secondary node to autonomously participate in handover management, improving handover efficiency and reducing data interruption while maintaining reasonable system complexity.
3Device complexity
If the secondary node uses common SRB 0 for uplink random access only, then resource allocation is simple, but direct RRC message transmission is impossible requiring X2 interface coordination
Solution Approach 1:
The patent applies multi-functionality by configuring a dedicated SCG SRB on the secondary node that can handle both uplink random access and direct RRC message transmission. This transforms the SRB from a single-function random access channel to a multi-functional channel that also supports direct control plane communication, eliminating the need for X2 interface coordination for RRC messages and reducing handover coordination time.
Data Source
AI summary
Provided are a method, a device, equipment and a storage medium for managing a mobile handover. When the method for managing the mobile handover is applied to a source secondary base station, the method includes: in response to determining to switch a set user equipment (UE) to a target base station, sending a handover request message to the target base station; and in response to receiving a handover request acknowledgement message sent by the target base station, sending a handover command message to the UE by using a signaling radio bearer (SCG SRB) of a source secondary base station side to trigger the UE to perform a random access attempt on a serving cell under the target base station.