Dual-Connectivity RRC Synchronization for Secondary Cell Changes
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Solution Overview
Problem
In heterogeneous wireless communication networks, there is a challenge in ensuring seamless communication between anchor and booster nodes, particularly in managing the addition, modification, and removal of secondary cells due to latency issues and the inability of user equipment (UE) to transmit uplink signaling once a secondary cell is removed, leading to inefficiencies in resource management and communication.
Innovation Solution
The implementation of an anchor-booster network architecture that supports dual connectivity, where the anchor eNB handles control plane signaling and delay-sensitive traffic, while the booster eNB manages delay-tolerant user-plane traffic, with improved backhaul technologies and signaling mechanisms to coordinate the addition, modification, and removal of secondary cells, ensuring efficient resource allocation and UE communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual connectivity with anchor and booster nodes is implemented, then mobility robustness and quality of service are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The system segments the network into anchor nodes and booster nodes with distinct functional roles. Anchor nodes handle control plane signaling and delay-sensitive traffic, while booster nodes manage delay-tolerant user-plane traffic. This segmentation allows complex dual connectivity functionality to be distributed across multiple specialized nodes, improving mobility robustness while managing device complexity through clear role differentiation.
Solution Approach 2:
The anchor node acts as an intermediary between the UE and booster nodes. The anchor node receives RRC messages from the core network, processes them, and forwards appropriate messages to the booster node for execution. This intermediary role simplifies the UE's complexity by providing a centralized control point while enabling sophisticated dual connectivity operations.
2Productivity
If secondary cell removal is implemented to manage resource allocation, then resource management efficiency is improved, but communication reliability deteriorates due to UE inability to transmit uplink signaling
Solution Approach 1:
The system performs preliminary actions by maintaining the secondary cell in a suspended state rather than completely removing it. The secondary cell's configuration is preserved, and the UE maintains the ability to transmit uplink signaling even when the cell is not actively used for data transmission. This preliminary preservation of cell functionality allows rapid reactivation without communication interruptions.
Solution Approach 2:
Instead of permanently discarding the secondary cell when resource allocation changes, the system recovers and retains the cell configuration. The secondary cell can be quickly reactivated when needed by sending a simple activation command to the UE, avoiding the need for complete reconfiguration and maintaining communication reliability while achieving resource management goals.
Data Source
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AI summary
A user equipment (UE) operable to support dual connectivity, the UE comprising computer circuitry configured to receive (610) a radio resource control (RRC) reconfiguration message from a macro evolved node B (MeNB), the RRC reconfiguration message indicating to modify radio resource information of a secondary cell associated with a secondary eNB (SeNB); send (620) a dedicated preamble to the SeNB indicating that the UE has completed an RRC reconfiguration procedure and that the secondary cell has been modified; and perform (630) an uplink transmission to the SeNB having modified radio resource information, the UE supporting dual connectivity to the MeNB and the SeNB.