MME SMS Serving Node Registration via Subscriber Service Check
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Solution Overview
Problem
In wireless communications systems, when a combined attach or update request does not carry SMS only indication information, the Mobility Management Entity (MME) inaccurately requests the Home Subscriber Server (HSS/HLR) to register it as a serving node for short message services, leading to extra signaling interactions and resource wastage.
Innovation Solution
A method is introduced where the MME determines, based on the location update request and subscriber identity, whether the subscriber has subscribed to a CS domain service or if SMS is the only CS domain service, and accordingly registers itself as the serving node for SMS services with the HSS/HLR, avoiding unnecessary registrations and signaling interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the MME blindly requests the HSS/HLR to register it as a serving node for SMS without checking subscriber service subscriptions, then the SMS service can be provided through the PS domain, but extra signaling interactions occur between the MME and HSS/HLR when the registration is inaccurate
Solution Approach 1:
The MME performs preliminary determination of whether the subscriber has subscribed to CS domain services before requesting the HSS/HLR to register it as a serving node. This preliminary action prevents unnecessary registration requests and reduces signaling overhead between the MME and HSS/HLR.
Solution Approach 2:
The system uses feedback from the location update request and subscriber identity information to determine whether SMS-only registration is appropriate. This feedback mechanism ensures that the MME only registers with the HSS/HLR when necessary, avoiding unnecessary signaling interactions.
2Adaptability or versatility
If the MME requests HSS/HLR registration for all combined attach or update requests, then the SMS service can be provided through the PS domain, but the registration becomes inaccurate when the subscriber has other CS domain services
Solution Approach 1:
The patent applies different registration strategies based on the specific subscriber's service subscription characteristics. For subscribers with SMS-only CS services, the MME registers with the HSS/HLR for SMS provision through PS domain. For subscribers with other CS domain services, the MME does not perform this registration, maintaining registration accuracy.
Solution Approach 2:
The system changes the registration parameter based on the subscriber's service subscription type. When the subscriber has SMS-only CS services, the registration parameter is set to enable SMS through PS domain. When the subscriber has other CS domain services, the registration parameter is adjusted to prevent inaccurate registration.
3Loss of energy
If the MME determines subscriber service subscriptions before requesting HSS/HLR registration, then unnecessary signaling interactions are reduced, but the determination process adds complexity to the MME operations
Solution Approach 1:
The MME performs a partial determination process by checking specific indicators in the location update request and subscriber identity information rather than conducting a complete analysis of all subscriber services. This partial action reduces signaling resources while keeping the determination process relatively simple.
Data Source
AI summary
The present invention provides a method, a subscriber server and a mobility management entity for determining a serving node of a short message service. After receiving a location update request sent by an MME, an HSS/HLR determines services subscribed to by a subscriber. When determining that the subscriber has not subscribed to a CS domain service or there is only an SMS service in CS domain services subscribed to by the subscriber, the HSS/HLR registers the MME as a serving node that provides the SMS service for the subscriber.