VPLMN Network Node Roaming Feedback Mechanism
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Solution Overview
Problem
In the 5G NR network, user equipment in a roaming environment often fails to recognize Steering of Roaming (SoR) information, which is crucial for network selection, leading to uncertainties in network operation and user equipment situation recognition.
Innovation Solution
A network node in the Visited Public Land Mobile Network (VPLMN) is configured with a receiving unit to receive SoR information from the Home Public Land Mobile Network (HPLMN), a transmitting unit to send this information to user equipment, and a control unit to respond to the HPLMN if the user equipment fails to receive the information, enabling the network to recognize the user equipment's situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SoR information is transmitted to user equipment in roaming environment, then network selection control is improved, but reliability of information delivery deteriorates when user equipment fails to receive the information
Solution Approach 1:
The patent implements a feedback mechanism where the network node receives acknowledgment from user equipment regarding successful reception of SoR information. When no acknowledgment is received within a predetermined time, the network node determines that the information was not successfully delivered and can take appropriate actions (such as retransmission or alternative routing). This feedback loop ensures reliable information delivery in roaming environments by allowing the network to detect and respond to delivery failures.
2Ease of operation
If the network transmits SoR information to user equipment, then network management capability is improved, but the complexity of the transmission and acknowledgment process increases
Solution Approach 1:
The patent employs preliminary action by setting up predetermined time thresholds and acknowledgment protocols before actual SoR information transmission occurs. The network node is pre-configured with timing parameters and decision rules that automatically trigger upon information transmission. This preliminary setup simplifies the actual transmission process by eliminating the need for complex real-time decision-making, as the system already has predetermined rules in place for handling acknowledgments and timing.
Data Source
AI summary
A network node is a first network node in a VPLMN (Visited Public land mobile network), the network node including a receiving unit configured to receive information relating to network selection, from a second network node in an HPLMN (Home Public land mobile network); a transmitting unit configured to transmit the information relating to network selection, to a user equipment; and a control unit configured to transmit, to the second network node, a response indicating that the user equipment was unable to receive the information relating to network selection, when a response, with respect to the information relating to network selection transmitted to the user equipment, is not received from the user equipment.