Dual-Connectivity Target-Node Selection Using Arrival-Probability Forwarding
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Solution Overview
Problem
In dual-connectivity wireless communications, the source secondary node lacks sufficient information to perform selective early data forwarding to target secondary nodes, leading to increased signaling overhead due to indiscriminate resource allocation.
Innovation Solution
The master node provides the source-secondary node with information on the estimated arrival probability of a cell change to target-secondary nodes, enabling the source-secondary node to selectively perform early data forwarding only to nodes with a higher likelihood of access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source secondary node performs early data forwarding to all candidate target secondary nodes, then data transmission continuity is improved, but signaling overhead and resource allocation increase
Solution Approach 1:
The patent segments the set of candidate target secondary nodes into multiple groups based on estimated arrival probability. Instead of treating all candidate nodes uniformly, the source secondary node divides them into high-probability groups and low-probability groups, performing early data forwarding only to high-probability groups. This segmentation reduces the number of nodes requiring signaling interactions while maintaining data transmission continuity.
Solution Approach 2:
The patent applies different quality levels of early data forwarding to different candidate target secondary nodes based on their estimated arrival probability. High-probability nodes receive full early data forwarding with complete resource allocation, while low-probability nodes receive reduced or no early data forwarding. This local differentiation optimizes the balance between reliability and signaling overhead.
2Reliability
If early data forwarding is performed to all target secondary nodes, then handover reliability is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent performs preliminary estimation of arrival probability for each candidate target secondary node before executing early data forwarding. Based on this preliminary assessment, the source secondary node pre-selects which nodes will receive early data forwarding resources. This preliminary action prevents wasteful resource allocation to nodes with low handover probability while ensuring adequate resources are allocated to high-probability nodes.
Solution Approach 2:
The patent changes the parameter of resource allocation based on the estimated arrival probability parameter. Instead of allocating fixed resources to all candidate nodes, the system dynamically adjusts the amount of early data forwarding resources allocated to each node according to its probability score. This parameter-based allocation improves resource efficiency while maintaining handover reliability for likely targets.
3Device complexity
If the source secondary node lacks arrival probability information, then system complexity is reduced, but the ability to perform selective data forwarding deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism where the master node provides estimated arrival probability information to the source secondary node. This intermediary information flow enables the source secondary node to make informed decisions about selective early data forwarding without requiring the source node itself to perform complex probability calculations, thus maintaining relatively simple system architecture while gaining adaptability.
Data Source
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AI summary
According to example embodiment, a method may include transmitting, by a master node (MN) to a target-secondary node (T-SN), a request for the target-secondary node (T-SN) to prepare a set of one or more candidate target primary cells of a secondary cell group (candidate target PSCells) for a conditional PSCell change for the user device; and transmitting, by the master node (MN) to a source-secondary node (S-SN) that provides dual connectivity for a user device, information indicating or relating to an arrival probability of a cell change for the user device to the target-secondary node (T-SN).