CSFB Priority Service Handling via MME-HSS Information Exchange
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Solution Overview
Problem
In the CSFB mechanism, the network side fails to provide Enhanced Multimedia Priority Service (eMPS) to user equipment (UE) without prior knowledge of their priority access rights, leading to potential service rejections during network congestion, which can impact critical communications like emergency responses.
Innovation Solution
A method where the Mobility Management Entity (MME) acquires priority service information from the Home Subscriber Server (HSS) using a location update acknowledgment message and determines the UE's CSFB priority service right, enabling preferential access to the 2G or 3G network for voice services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network side uses conventional CSFB mechanism without priority information acquisition, then the network operation is simple, but the network side cannot provide eMPS service to priority users during network congestion
Solution Approach 1:
The patent applies preliminary action by acquiring priority service information from HSS in advance during the attachment process, before the actual CSFB service is needed. This allows the MME to have priority information ready when network congestion occurs, enabling reliable eMPS service provision without adding complexity during critical moments.
Solution Approach 2:
The patent uses the location update acknowledgment message as an intermediary to transfer priority service information from HSS to MME during the attachment process. This intermediary mechanism enables information exchange without requiring direct complex interactions between network entities during service delivery.
2Reliability
If the network side acquires priority information in advance during attachment process, then eMPS service can be provided reliably, but the signaling message complexity increases
Solution Approach 1:
The patent merges the priority information acquisition process with the existing attachment process by including priority service information in the location update acknowledgment message. This combination allows the MME to obtain priority information during routine attachment procedures without requiring separate signaling exchanges, thus minimizing additional message complexity.
3Productivity
If the MME determines priority rights without prior information, then the system operation is straightforward, but priority users may be rejected during network congestion
Solution Approach 1:
The patent implements preliminary action by having the MME acquire and store priority service information from HSS during the attachment process before any service request occurs. This preliminary information availability ensures that when network congestion happens, the MME can immediately identify priority users and provide eMPS service without rejection, maintaining both efficiency and reliability.
Data Source
AI summary
Embodiments of the present invention provide a method, an apparatus, and a system for processing an eMPS in a CSFB mechanism. The method in the embodiment of the present invention mainly includes: receiving a CSFB access request of a user equipment; determining that the user equipment has a CSFB priority service right according to acquired priority service information of the user equipment; and providing a CSFB access service preferentially for the user equipment with the CSFB priority service right.