Mobile Switching Node Circuit Switching Paging Selection
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Solution Overview
Problem
In wireless communication networks, the current methods for selecting a terminal device to handle circuit switching calls are inefficient, leading to high failure rates due to the inability to distinguish between terminal devices sharing the same mobile subscriber international ISDN/PSTN number, as they may not all support voice call services, resulting in blind selection by mobile switching nodes.
Innovation Solution
Implementing a method where mobile switching nodes store and verify the circuit switching call capability of terminal devices before sending paging requests to mobility management nodes, ensuring that only devices supporting circuit switching are selected for voice calls, thereby reducing the failure rate of circuit switching calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the mobile switching node selects a terminal device blindly based on subscriber number only, then the selection process is simple, but the call failure rate increases because some terminal devices may not support circuit switching call function
Solution Approach 1:
The mobile switching node performs preliminary actions by storing capability indications of terminal devices in advance (received from mobility management node during location update or attach procedures). Before initiating a circuit switching call, the node queries this stored information to determine which terminal device supports the call function, avoiding blind selection and reducing call failure rate.
2Reliability
If the mobile switching node stores capability information for multiple terminal devices sharing the same MSISDN, then the call success rate improves, but the information storage and management complexity increases
Solution Approach 1:
The capability indication information is extracted from the mobility management node and stored separately in the mobile switching node's database. This extracted information is maintained independently from other terminal device data, allowing efficient querying and management without increasing overall system complexity significantly.
Solution Approach 2:
The mobility management node acts as an intermediary that collects capability information from terminal devices during attach or location update procedures and transfers it to the mobile switching node. This intermediary mechanism simplifies the information collection process for the mobile switching node, which only needs to receive and store the pre-collected capability indications.
3Reliability
If the system queries capability information from mobility management node for each call attempt, then the call success rate improves, but the signaling overhead and time delay increase
Solution Approach 1:
The capability indication information is obtained and stored in advance by the mobile switching node during location update or attach procedures, rather than querying it at the moment of call initiation. This preliminary action eliminates the need for real-time queries during call setup, reducing signaling overhead and time delay while ensuring accurate capability information is available when needed.
Data Source
AI summary
The present disclosure relates to a mobile switching node and a mobility management node to page a terminal device. The present disclosure may provide a method for a mobile switching node to page a terminal device. The method includes: storing (S201) an indication of whether a terminal device supports a circuit switching call function; receiving (S202) a request to implement the circuit switching call function, in regard to a subscriber number corresponding to the terminal device; and sending (S203), to a mobility management node, a circuit switching paging request for the terminal device, in response to that the indication shows the terminal device supports the circuit switching call function.