MME Paging Message Handling for Idle State Signalling Reduction
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Solution Overview
Problem
In the context of radio communications, when a VLR sets up a SGs interface with an MME, there is a possible absence of a signalling connection between the VLR and the radio access network node, leading to discarded response messages and wastage of network resources at the MME-SGSN interface, GERAN/UTRAN air interface, and MSC/VLR.
Innovation Solution
A method and device for processing paging messages in an ISR-activated state, where the MME receives a paging message from an MSC/VLR and determines if it is from a default VLR intended for SMS, and if so, does not transmit the message to an SGSN, and the SGSN discards CS Paging Indication messages without paging a UE in UTRAN/GERAN if triggered by a default MSC/VLR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MME transmits paging messages to the SGSN for all paging requests from MSC/VLR, then the UE can be reliably paged for both CS and SMS services, but unnecessary paging signalling is generated when the MSC/VLR is a default VLR, wasting network resources
Solution Approach 1:
The MME performs preliminary identification of whether the MSC/VLR is a default VLR before transmitting the paging message to the SGSN. By checking the VLR type in advance, the system avoids unnecessary paging transmissions to the SGSN when the MSC/VLR is a default VLR, thus preventing waste of network resources while maintaining reliable paging for non-default VLRs
Solution Approach 2:
The patent applies different paging handling strategies based on the local quality (type) of the MSC/VLR. For default VLRs, the MME suppresses paging message transmission to the SGSN, while for non-default VLRs, normal paging transmission is performed. This localized differentiation resolves the contradiction by tailoring the paging behavior to the specific VLR type
2Reliability
If the SGSN pages the UE in UTRAN/GERAN upon receiving CS Paging Indication from MME, then the UE can be reached for CS services, but unnecessary paging signalling occurs when the paging is triggered by a default MSC/VLR for SMS
Solution Approach 1:
The SGSN performs preliminary identification of whether the CS Paging Indication message is triggered by a default MSC/VLR before initiating paging in UTRAN/GERAN. By checking the trigger source in advance, the system avoids unnecessary paging transmissions when the trigger comes from a default VLR, thus reducing signalling complexity while maintaining CS service accessibility for non-default VLRs
Solution Approach 2:
The patent applies different paging responses based on the local quality (trigger source) of the CS Paging Indication message. When triggered by a default VLR, the SGSN suppresses paging transmission; when triggered by a non-default VLR, normal paging is performed. This localized differentiation resolves the contradiction by adapting the paging behavior to the specific trigger source
Data Source
AI summary
The present invention discloses a method and device for processing paging message when Idle State Signalling Reduction (ISR) is active. The method includes the following step: a Mobility Management Entity (MME) determines that a Mobile Switching Center (MSC)/Visited Location Register (VLR) is a default MSC/VLR and the paging message is used for a Short Message Service (SMS), the MME does not send the paging message to a Serving General Packet Radio Service (GPRS) Support Node (SGSN). The present invention can reduce the unnecessary paging signalling in an Evolved Packet System (EPS) and the 2nd Generation (2G)/3rd Generation (3G), therefore avoiding the network resource waste occurred in the interface of the MME and the SGSN, in the air interface of a General Packet Radio Service/Enhanced Data Rate for Global System for Mobile communication Evolution Radio Access Network (GERAN)/Universal Terrestrial Radio Access Network (UTRAN), and in the MSC/VLR.