Mobility Management Unit ISR Deactivation Logic
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Solution Overview
Problem
The existing technologies face challenges in synchronizing bearer deletion and network element states during Idle mode Signaling Reduction (ISR) deactivation scenarios, leading to errors and resource wastage due to asynchronous states and conflicting deletion requests between mobility management units.
Innovation Solution
A method is introduced where one mobility management unit determines whether to initiate a bearer deletion by the Serving Gateway (S-GW) based on the deactivation reason, sending a request message with an identifier to instruct the S-GW to delete the bearer from the other mobility management unit, or notifying the other unit to perform deactivation, depending on the cause of deactivation such as user equipment power-off, network element shift, or network detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the S-GW deletes bearers for all mobility management units when receiving a bearer deletion request from one mobility management unit, then the bearer deletion is simplified, but it causes unnecessary resource deletion and service interruption when the deactivation reason is network detachment
Solution Approach 1:
The patent applies local quality by making the S-GW's bearer deletion behavior context-dependent. Instead of a uniform deletion approach, the S-GW selectively deletes bearers from the other mobility management unit only when the deactivation reason indicates UE power-off or location change, while preserving bearers when the reason is network detachment. This localized differentiation resolves the contradiction between simplification and service continuity.
2Adaptability or versatility
If the mobility management unit sends a bearer deletion request to the S-GW for every ISR deactivation, then the deactivation process is standardized, but it causes unnecessary signaling overhead and resource wastage when the deactivation reason is network-initiated detachment
Solution Approach 1:
The patent applies partial action by having the mobility management unit send bearer deletion requests to the S-GW only when necessary (UE power-off or location change), rather than for all ISR deactivation scenarios. This selective approach reduces unnecessary signaling overhead while maintaining proper deactivation handling for cases that require it.
3Stability of the object's composition
If the S-GW maintains bearer information for both mobility management units after ISR deactivation, then service continuity is preserved, but it causes resource wastage and state asynchrony when the ISR function should be fully deactivated
Solution Approach 1:
The patent applies preliminary action by having the S-GW proactively delete bearer information from the other mobility management unit immediately after confirming the deactivation reason warrants full ISR deactivation. This prevents the persistence of stale bearer information and associated resource wastage while maintaining service continuity during the transition period.
Solution Approach 2:
The patent implements feedback through the S-GW's selective bearer deletion mechanism. The S-GW receives deactivation notifications from mobility management units, processes the deactivation reason, and provides feedback by selectively deleting bearers from the other mobility management unit. This feedback loop ensures resource synchronization and prevents wastage of network resources associated with deactivated ISR states.
Data Source
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AI summary
The present invention discloses a method for deactivating ISR and a mobility management unit. Wherein the above method includes: when an ISR deactivation is needed to be performed, the mobility management unit judging whether to perform the following operation by the S-GW according to reasons of the ISR deactivation: the mobility management unit sends a request message of deleting bearer to the S-GW, and carries, in the request message, an identifier which is used to instruct the S-GW to initiate the bearer deletion to the other mobility management unit associated with the ISR function activation; or the mobility management unit notifies the other mobility management unit associated with the ISR function activation to perform the ISR deactivation. The synchronization between the bearer deletion and the network element state in the ISR function deactivation scenarios can be realized by the above technical scheme.