Conditional Secondary Node Change Coordination
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Solution Overview
Problem
SN-initiated conditional SN change procedures in wireless communication systems face challenges in coordination between master nodes and candidate nodes due to unsupported protocols and complex condition formatting, leading to potential failures and inefficiencies in handover processes.
Innovation Solution
Implementing a method where the master node receives an SN Change Required message from the source SN, including candidate cell information and conditions, and assigns configuration IDs to facilitate communication with the candidate SN, allowing the UE to connect only when conditions are met, thereby enhancing coordination and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If immediate SN addition/change procedures are used, then the procedure execution speed is fast, but the failure probability increases due to messaging latency and lack of condition checking
Solution Approach 1:
The patent applies preliminary action by having the UE check conditions (such as signal quality thresholds) before executing the SN addition or change procedure. The network configures conditional procedures with specific conditions that must be satisfied beforehand, ensuring that the procedure only executes when appropriate, thus reducing failure probability while maintaining efficient execution when conditions are met
2Reliability
If conditional procedures with condition checking at UE are implemented, then the procedure reliability improves, but the complexity of coordination between network nodes increases
Solution Approach 1:
The patent uses the UE as an intermediary that performs local condition checking and decision-making. Instead of complex coordination between all network nodes, the UE autonomously evaluates configured conditions and executes procedures when appropriate. This simplifies network node coordination while maintaining high reliability through distributed intelligence at the UE side
3Device complexity
If legacy immediate procedures without condition checking are used, then the system complexity is low, but the latency increases and procedure failures become more probable
Solution Approach 1:
The patent applies preliminary action by pre-configuring conditional procedures with all necessary conditions and parameters before execution. The UE checks these pre-configured conditions locally without requiring additional messaging latency during execution. This approach maintains low system complexity while eliminating runtime coordination overhead and reducing overall procedure latency
Data Source
AI summary
A base station can perform various methods for supporting a secondary node (SN) procedure. In one example, a first base station, operating as (i) a source SN. (ii) a target SN, or (iii) a candidate SN for the SN procedure, performs a method including: communicating a message with a second base station, operating as a master node (MN), to perform the SN procedure; and determining, based on whether the SN procedure is a conditional procedure or a non-conditional procedure, whether to start a timer in response to the communicating.


