Conditional Secondary Node Change With Multiple Target SNs
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Solution Overview
Problem
Existing SN addition or change procedures in wireless communication systems suffer from latency and high failure probability due to the lack of condition-based checks, leading to inefficiencies in determining the target secondary node for user equipment (UE) connectivity.
Innovation Solution
Implementing a method for managing conditional secondary node changes by allowing the master node (MN) and source secondary node (S-SN) to exchange information about multiple target SNs with specific conditions, using information elements (IEs) to determine the appropriate connection after conditions are met, thereby reducing complexity and improving connectivity reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If immediate SN addition or change procedure is used, then the procedure can be executed quickly, but latency increases and failure probability increases due to lack of condition-based checks
Solution Approach 1:
The patent applies preliminary action by having the network node prepare multiple candidate target SNs and their corresponding conditions in advance before the UE needs to connect. The network node identifies potential target SNs, establishes conditions for connecting to each, and prepares configuration information beforehand, so that when the UE needs to connect, it can quickly select from pre-prepared options rather than searching from scratch, thus reducing both latency and failure probability
Solution Approach 2:
The patent implements feedback mechanisms where the network node receives feedback from UEs about their connection conditions and uses this information to dynamically adjust and optimize the selection of target SNs. The system continuously monitors connection conditions, evaluates multiple candidates based on real-time feedback, and selects the most appropriate target SN, thereby improving reliability while maintaining quick execution through intelligent decision-making
2Reliability
If multiple target SNs with conditions are managed, then connectivity reliability improves, but message complexity and processing overhead increase
Solution Approach 1:
The patent applies segmentation by dividing the complex task of managing multiple target SNs into distinct, modular components. Each candidate target SN is treated as a separate entity with its own unique condition set and configuration information. This segmentation allows the system to manage complexity through structured organization, where each segment can be independently evaluated, stored, and selected based on specific conditions, thereby improving reliability without overwhelming processing overhead
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting selection criteria based on varying network conditions. Instead of using fixed complex rules, the system changes parameters such as signal strength thresholds, latency requirements, and load conditions to evaluate multiple target SNs. This approach allows flexible adaptation to different scenarios while maintaining manageable message complexity through parameter-based decision-making rather than rigid structural complexity
Data Source
AI summary
A master mode (MN) provides, with a source secondary node (S-SN), a dual connectivity (DC) connection to a user equipment (UE). A method in the MN includes receiving, from the S-SN, a first message indicating that a change in the SN is required for the UE, the message including a plurality of information elements (IBs) for a plurality of target SNs, to one of which the UE connects after a respective condition is satisfied, each of the IBs including an identifier of a respective one of the plurality of target SNs; and transmitting, to the S-SN, a second message indicating that the change in the SN is confirmed.