CS Domain Registration Notification via HSS Mediator
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Solution Overview
Problem
In telecommunications networks, application servers are not adequately notified when user equipment (UE) re-registers only with the circuit-switched (CS) domain, leading to a lack of awareness about available non-data-related services, as existing systems prioritize data-related services upon re-registration with the packet-switched (PS) domain.
Innovation Solution
The system generates a subscribe-notifications-request (SNR) with attribute value pairs to notify the application server when the UE re-registers only with the CS domain, using a push-notification-request (PNR) from the Home Subscriber Server (HSS) to inform the application server of the CS domain registration, ensuring notification without initial PS domain registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the system prioritizes notification for PS domain registration, then data-related services are efficiently delivered, but the application server remains unaware of UE registration in CS domain only
Solution Approach 1:
The notification system is segmented into domain-specific notification paths: one for PS domain registration and another for CS domain registration. The HSS generates separate notification messages (LOCATION_REPORTING_CONTROL) for each domain, allowing the application server to receive targeted notifications based on the specific domain where UE registered, thus eliminating information loss without requiring a single complex unified notification system
Solution Approach 2:
The HSS acts as an intermediary that receives location information from both PS and CS domains and generates appropriate notification messages for the application server. It mediates between the domain-specific registration processes and the application server, ensuring that the server is notified of UE registration regardless of which domain (PS or CS) the UE registered in
2Reliability
If the system notifies application server for all UE re-registrations, then complete service availability is achieved, but notification overhead increases
Solution Approach 1:
The notification system applies local quality by sending different types of notifications based on the specific domain where UE registered. The HSS analyzes the registration domain and generates location reporting control messages with domain-specific information, allowing the application server to process only relevant notifications for the services it provides, reducing unnecessary processing overhead while maintaining complete service availability
Solution Approach 2:
The system performs partial action by notifying the application server only when UE registers in a domain relevant to the services the server provides. The HSS determines whether notification is necessary based on the registration domain and service type, avoiding excessive notifications for unrelated domains while ensuring all potentially relevant notifications are sent
Data Source
AI summary
A system and method for registering a user equipment (UE) to a circuit-switching (CS) domain only is discussed herein. An application server (AS) generates a subscribe-notifications-request (SNR) and transmits the SNR to a node of a network, such as a home subscriber server, to request a change in user data when a user equipment (UE) registers only with the CS domain after reconnection to the network. The SNR includes an attribute value pair (AVP) to generate a notification that the UE is registered with the CS domain without requiring initial registration with a packet-switched (PS) domain. The HSS, which receives notification of registration of the UE to the CS domain from a home location register (HLR) a mobile switching center/visitor location register (MSC/VLR), generates a push-notification-request (PNR) to notify the AS of the change in user data.