PDN Connection Management for CSFB and SRVCC During SIPTO
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Solution Overview
Problem
Current mobile communication networks face inefficiencies in traffic transmission paths and network management due to the lack of methods for handling Circuit Switched Fall Back (CSFB) and Single Radio Voice Call Continuity (SRVCC during Selected IP Traffic Offload (SIPTO) services, particularly in scenarios where optimal and sub-optimal PDN connections coexist, leading to service disruptions and resource wastage.
Innovation Solution
A method is introduced to manage CSFB and SRVCC by establishing a second Public Data Network (PDN) connection during SIPTO services, determining which PDN connection to release, and storing context information to optimize resource allocation and minimize service disruptions, involving the MME in controlling the release of sub-optimal PDN connections during handover procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a second PDN connection is established during SIPTO service, then network efficiency and resource utilization are improved, but device complexity and management overhead increase
Solution Approach 1:
The patent segments PDN connections into optimal and sub-optimal categories, allowing the network to establish multiple PDN connections with different purposes. The MME maintains context information for both types of connections, enabling selective management based on service requirements while improving overall network efficiency
Solution Approach 2:
The patent implements dynamic management of PDN connections by allowing the MME to determine which connection to release based on real-time conditions. The system dynamically switches between maintaining one or two PDN connections depending on whether CSFB or SRVCC is requested, adapting to changing network states
2Loss of energy
If sub-optimal PDN connections are released during handover, then resource wastage is reduced, but service continuity may be disrupted
Solution Approach 1:
The patent stores context information for sub-optimal PDN connections in advance before handover occurs. This preliminary action allows the MME to quickly retrieve and utilize the stored context when CSFB or SRVCC is requested, ensuring seamless service continuity while enabling efficient resource release
Solution Approach 2:
The MME acts as an intermediary that manages the transition between optimal and sub-optimal PDN connections. By maintaining context information and controlling the release process, the MME ensures that resource wastage is minimized while service continuity is preserved through coordinated handover management
3Reliability
If context information is stored for multiple PDN connections, then service continuity is maintained, but memory requirements and processing overhead increase
Solution Approach 1:
The patent applies local quality by storing context information selectively - maintaining detailed context for optimal PDN connections while storing condensed context for sub-optimal connections. The MME stores specific fields (e.g., EPS bearer IDs, QoS parameters) based on their relevance to ongoing services, reducing overall memory requirements while preserving service continuity
Data Source
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AI summary
Provided according to a disclosure of the present specification is a method for processing a circuit switched fall-back (CSFB) or a single radio voice call continuity (SRVCC) during a selected IP traffic offload (SIPTO) service. The method for processing a CSFB or a SRVCC during a SIPTO service in a network entity responsible for a control plane in a mobile communication network comprises the steps of: in a state in which a first packet data network (PDN) connection has been established for a terminal, establishing a second PDN connection according to the application of the SIPTO service while maintaining the first PDN connection; if CSFB or SRVCC is requested, determining which to release from among the first PDN connection and the second PDN connection; and releasing the any one PDN connection which has been determined.