Dual Connectivity PSCell Preparation via Addition Request
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Solution Overview
Problem
Dual connectivity mobile communication systems face challenges in efficiently managing primary secondary cell changes between master and secondary nodes, particularly in preparing and configuring available cells for seamless handovers and communication transitions.
Innovation Solution
The system implements mechanisms for a master node to send addition requests to target secondary nodes, specifying the maximum number of primary secondary cells to prepare, and for the target nodes to determine and indicate the prepared cells, enabling efficient primary secondary cell change processes through message sequences and RRC reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master node requests preparation of multiple primary secondary cells for PSCell change, then the availability and success rate of handovers is improved, but the signaling overhead and processing complexity between nodes increases
Solution Approach 1:
The invention applies preliminary action by having the target secondary node prepare multiple candidate primary secondary cells in advance before the actual handover occurs. The addition request message triggers the target node to pre-configure multiple PSCell options with their respective cell IDs, so that when handover is needed, the user device can immediately switch to a prepared cell without additional preparation delay, thereby improving handover reliability while the signaling complexity is managed through efficient message structures.
2Adaptability or versatility
If the target secondary node prepares more primary secondary cells, then the flexibility and adaptability of the dual connectivity system is improved, but the resource consumption and processing load at the secondary node increases
Solution Approach 1:
The invention applies partial action by having the target secondary node prepare a limited but sufficient number of primary secondary cells based on the maximum number indicated in the addition request message. Rather than preparing all possible cells, the system prepares an optimal subset that provides adequate flexibility for handover scenarios while constraining the processing load and resource consumption at the secondary node to manageable levels.
3Measurement precision
If the system implements detailed tracking and reporting of prepared cells between nodes, then the measurement precision and control accuracy is improved, but the information overhead and message complexity increases
Solution Approach 1:
The invention applies the extraction principle by isolating the essential handover control information into dedicated message fields. The addition request message extracts and transports only the critical parameters (maximum number of PSCells to prepare, cell IDs, configuration information) needed for cell preparation, while the change required message extracts and reports only the actual preparation status. This selective extraction of necessary information achieves precise tracking without the overhead of transmitting complete system state data.
Data Source
AI summary
An apparatus, method and computer program is described including sending an addition request from a master node of a dual connectivity mobile communication system to a target secondary node of the dual connectivity mobile communication system, wherein each addition request includes information relating to a maximum number of primary secondary cells that can be prepared for primary secondary cell change by said target secondary node; and receiving a response to the addition request from the target secondary node indicating how many primary secondary cells have been prepared by said target secondary node in response to said addition request.