MME Paging Priority Handling for CS Services in LTE
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Solution Overview
Problem
The LTE system lacks a scheme to handle paging for Circuit Switched (CS) services when a Paging procedure for Packet Switched (PS) services is ongoing, particularly for User Equipment (UE) in idle mode, leading to difficulties in prioritizing and managing CS service requests.
Innovation Solution
The proposed solution involves preferentially handling paging for CS services by setting a priority indicator in page messages, allowing the Mobility Management Entity (MME) and Evolved Node B (eNB) to interrupt and prioritize the ongoing PS paging procedure to initiate CS paging, ensuring timely and effective handling of CS service requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LTE system uses a predefined paging procedure for PS services, then the paging procedure can be completed, but CS service requests cannot be handled simultaneously
Solution Approach 1:
The patent applies dynamics by making the paging procedure adjustable and flexible. The MME can dynamically switch between PS paging and CS paging modes based on the type of service request received. When a CS service request is detected during PS paging, the system dynamically adapts the paging procedure to handle CS services with higher priority, allowing simultaneous handling of both service types through dynamic procedure modification.
Solution Approach 2:
The patent segments the paging procedure into distinct PS paging and CS paging handling paths. By separating the handling of PS services and CS services into different procedural segments, the system can manage each type independently and prioritize CS services when needed, enabling both services to be handled without complete procedural conflict.
2Loss of time
If CS service requests are prioritized during ongoing PS paging, then service delay is reduced, but paging procedure complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the MME monitors the type of service request and adjusts the paging procedure accordingly. When a CS service request is detected, the system provides feedback by modifying the paging procedure to prioritize CS handling. This feedback-driven adjustment allows the system to reduce service delay for CS requests while managing procedure complexity through automated decision-making.
Solution Approach 2:
The patent applies preliminary action by preparing the paging procedure in advance to handle CS service priorities. The MME is configured to automatically identify and prioritize CS service requests before they are fully processed, allowing preemptive adjustment of the paging procedure. This preliminary preparation enables reduced service delay without requiring complex real-time procedural changes.
3Productivity
If the system allows simultaneous paging for PS and CS services, then service handling capability improves, but resource management becomes more difficult
Solution Approach 1:
The patent applies local quality by assigning different handling characteristics to different service types within the same paging procedure. PS services and CS services are treated with different local qualities - CS services receive higher priority and specialized handling when detected during PS paging. This localized differentiation allows simultaneous handling of both service types while maintaining manageable resource allocation through service-type-specific processing rules.
Data Source
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AI summary
Provided is a method for paging a User Equipment (UE) in an idle state by a Mobility Management Entity (MME) in a wireless communication network in which a Packet Switched (PS) domain and a Circuit Switched (CS) domain coexist. The method includes receiving a CS page message for paging the UE in a CS domain; and upon receiving the CS page message, sending a PS page message for paging the UE in a PS domain, the PS page message including a priority indicator, to an Evolved Node B (ENB) where the UE is located.