RAB-Modification Rate Threshold for Dual Connectivity Stability
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Solution Overview
Problem
In cellular wireless networks supporting dual-connectivity, users experience frequent transitions between dual connectivity and standalone connectivity (ping-ponging) due to fluctuating RF interference or environmental changes, leading to inconsistent data throughput, increased battery drain, and elevated control-plane signaling loads.
Innovation Solution
A mechanism is implemented to detect a high rate of RAB-modification requests between access nodes and discontinue further requests, temporarily or until the user disconnects, to prevent continuous switching between dual connectivity and standalone connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system continuously transitions between dual connectivity and standalone connectivity in response to fluctuating RF interference, then the system adapts to changing environmental conditions, but user experience deteriorates due to inconsistent data throughput and increased battery drain
Solution Approach 1:
The system applies preliminary anti-action by implementing a threshold mechanism that prevents transitions when the benefit is insufficient. Before allowing a connectivity mode transition, the system evaluates whether the RF interference level exceeds a predetermined threshold, thereby preventing unnecessary transitions that would degrade user experience while still allowing transitions when truly needed.
2Adaptability or versatility
If the system frequently switches between dual connectivity and standalone connectivity modes, then it responds to environmental changes, but control-plane signaling load increases
Solution Approach 1:
The threshold mechanism serves as preliminary anti-action by blocking unnecessary signaling transitions. The system pre-establishes a threshold that must be exceeded before triggering a connectivity mode change, thereby preventing frequent back-and-forth transitions and the associated control-plane signaling overhead.
3Adaptability or versatility
If the system allows continuous RAB-modification requests between access nodes, then connectivity configuration remains flexible, but ping-ponging between connectivity modes occurs
Solution Approach 1:
The threshold mechanism applies preliminary anti-action by preventing RAB-modification requests that would trigger unnecessary connectivity mode transitions. By requiring the RF interference level to exceed a predetermined threshold before allowing mode changes, the system maintains connectivity stability while still permitting necessary reconfigurations.
Data Source
AI summary
A method and system to help address excessive RAB-modification requests as may happen when a UE is connected with and served by a first access node and the first access node repeatedly configures and de-configures dual connectivity for the UE where the UE would be connected with and served concurrently by the first access node and a second access node, with each configuring and de-configuring including a RAB-modification request to transfer a RAB of the UE between being anchored at the first access node and being anchored at a second access node. A computing system could detect that the rate of such RAB-modification requests is at least predefined threshold high and could cause the requests to be discontinued, such as by causing the first access node to at least temporary stop sending such requests.