Joint Handover of User Equipment and Secondary Cell Group in LTE Dual Connectivity
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Solution Overview
Problem
In wireless communication networks, especially in 3GPP LTE systems with dual connectivity, handover processes between different network nodes result in significant signaling overhead and latency due to the disconnection and reconnection of user equipment (UE) from secondary nodes, which is inefficient and resource-intensive.
Innovation Solution
Implementing a joint handover process that keeps the UE and secondary nodes connected, allowing them to be handed over together from one master node to another without disconnecting and reconnecting, thereby reducing signaling overhead and latency by eliminating separate handover and reconnection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover process is used in dual connectivity, then handover can be completed, but signaling overhead and latency increase due to disconnection and reconnection of UE from secondary nodes
Solution Approach 1:
The patent merges the handover of UE with the handover of secondary nodes by maintaining the SCG connection throughout the handover process. Instead of disconnecting and reconnecting the UE to secondary nodes separately, the secondary nodes are handed over together with the UE to the target master node, combining multiple handover operations into a single unified process that reduces signaling overhead and latency.
2Reliability
If traditional handover process is used in dual connectivity, then handover can be completed, but network efficiency decreases due to separate handover and reconnection processes
Solution Approach 1:
The patent combines the handover of UE and secondary nodes into a single operation where the SCG connection is maintained. This merging eliminates the need for separate handover and reconnection processes, thereby improving network efficiency by reducing the number of signaling interactions and processing steps required.
Solution Approach 2:
The patent ensures continuous connectivity between the UE and secondary nodes during handover by maintaining the SCG connection. This continuity allows the useful action of data transmission to proceed without interruption or reconnection, thereby improving network efficiency and reducing the burden on the radio access network and core infrastructure.
Data Source
AI summary
Systems and methods provide a joint handover process wherein a user equipment (UE) and at least one secondary node remain connected to each other and are handed over together from a first master node to a second master node. Thus, a re-establishment procedure with the at least one secondary node is avoided.