Dynamic Secondary-Connection Threshold Control for Dual Connectivity
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Solution Overview
Problem
In dual-connectivity scenarios, the SN-addition process can fail due to high uplink noise, preventing successful communication between the UE and the SN, even when strong downlink coverage is detected.
Innovation Solution
The master node (MN) dynamically adjusts the measurement threshold for UE coverage evaluation, requiring stronger downlink SN coverage to ensure a corresponding strong uplink receive signal strength, thereby facilitating successful SN-addition for dual connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the measurement threshold for UE coverage evaluation is set to allow SN-addition, then dual-connectivity service can be established, but SN-addition failures occur due to high uplink noise
Solution Approach 1:
The measurement threshold is made dynamic rather than fixed. The network device adjusts the threshold based on detected SN-addition failure rates, increasing it when failures occur and decreasing it when successes are achieved. This dynamic adaptation resolves the contradiction by allowing the system to balance between establishing dual-connectivity services and maintaining reliable SN-addition.
Solution Approach 2:
A feedback mechanism is implemented where the network device monitors SN-addition failure rates and uses this information to adjust the measurement threshold. The threshold adjustment is triggered when the failure rate exceeds a threshold, creating a closed-loop control system that continuously optimizes the balance between service establishment and reliability.
2Ease of operation
If a fixed measurement threshold is used for UE coverage evaluation, then the system is simple to operate, but it cannot adapt to varying uplink noise conditions causing SN-addition failures
Solution Approach 1:
The system transitions from a static fixed threshold to a dynamic adjustable threshold. The network device automatically adjusts the measurement threshold based on detected SN-addition failure rates, eliminating the need for manual intervention while maintaining operational simplicity. This resolves the contradiction by providing adaptive behavior without increasing operational complexity.
Solution Approach 2:
The system performs self-optimization by automatically detecting SN-addition failures and adjusting the measurement threshold without external intervention. The network device monitors its own performance and makes autonomous adjustments, maintaining ease of operation while improving reliability through adaptive behavior.
3Reliability
If the measurement threshold is increased to require stronger downlink coverage, then uplink random-access signaling success improves, but dual-connectivity service establishment becomes more difficult
Solution Approach 1:
The measurement threshold dynamically adjusts based on SN-addition failure rates rather than remaining fixed at a high value. When failures occur, the threshold increases to improve uplink success; when successes are achieved, the threshold decreases to facilitate dual-connectivity establishment. This dynamic behavior resolves the contradiction by balancing both requirements over time.
Solution Approach 2:
The system changes the measurement threshold parameter adaptively based on observed performance. By modifying this key parameter in response to SN-addition outcomes, the system optimizes the balance between ensuring reliable uplink random-access signaling and maintaining the ability to establish dual-connectivity services under varying conditions.
Data Source
AI summary
A mechanism for controlling configuration of secondary-connectivity for dual connectivity service in a system including a first access node and a second access node. The first access node or another entity detects occurrence of a threshold extent of secondary-connection addition failures involving the second access node, each secondary-connection addition failure comprising failure of a respective attempt to set up secondary air-interface connectivity between a user equipment device (UE) and the second access node for use in dual-connectivity service of the UE. And responsive to at least the detecting, a measurement threshold that the first access node will impose for use in UE evaluation of coverage of the second access node for dual-connectivity setup is dynamically increased from a first coverage-strength value to a stronger second coverage-strength value so as to require stronger coverage of the second access node as a condition for adding secondary-connectivity with the second access node.