ISR (Interrupt Service Routine) processing method, device and system in CSFB scenario

Abstract

The embodiment of the invention relates to an ISR (Interrupt Service Routine) processing method in a CSFB scenario, belonging to the communication field. The method comprises the following steps of: receiving a routing area refresh request message of CSFB-activated user equipment (UE); confirming whether the location area of the UE is changed or not; and if so, indicating that the UE does not activate the ISR. The embodiment of the invention also relates to ISR processing device and system in a CSFB scenario and realizes that an SGSN (Service GPRS Supporting Node) can accurately judge whetherto activate the ISR based on the condition that whether the location area is changed or not, solves the problem that the SGSN accurately decides whether to activate the ISR when the UE initiates a single RAU (Remote Access Unit) in the CSFB scenario, improves the ISR performance in the CSFB scenario, and ensures the service experience of users.

Description

technical field [0001] The present invention relates to the field of communication technology, and in particular to a method, device and system for processing idle mode signaling reduction (ISR, Idle mode signaling reduction) in a circuit switched domain service back to traditional network processing (CSFB, CS fallback) scenario. Background technique [0002] In an evolved packet system (EPS, Evolved Packet System) network, when a user equipment (UE, User Equipment) is about to initiate a Circuit Switched (CS, Circuit Switched) domain originating (MO, Mobile Originating) service, the UE needs to first transfer Go to the General Packet Radio Service (GPRS, General Packet Radio Service) / Universal Mobile Telecommunications System (UMTS, Universal Mobile Telecommunications System) network, choose a 2G / 3G cell to camp on, and then start the MO service. When the mobile switching center (MSC, Mobile SwitchCenter) receives a terminal call (MT, Mobile Terminated) service, the MSC sen...

AI Technical Summary

Problems solved by technology

[0005] When the UE performs a separate RAU process, the UE sends a RAU Request message to the Serving GPRS Support Node (SGSN, Serving GPRS Support Node), and the message carries the CSFBcapability indication. At this time, the SGSN cannot confirm whether the SGs association will be released

Therefore, the SGSN cannot make an accurate decision on whether to activate the ISR. If the SGSN chooses not to activate the ISR at this time, it may affect the performance of the ISR in the CSFB scenario. For example, if the SGs are not released, the actual situation is that the ISR can continue to be maintained Activated state; if the SGSN chooses to activate ISR at this time, it may cause interruption of CS domain services and affect user service experience. E-UTRAN network, according to the principle of ISR, idle state UE will not trigger the joint tracking area update process (Combined TAUProcedure)

At this time, if the MSC receives a called service in the CS domain, since the SGs association is released, the MSC can only page the UE on the GERAN / UTRAN network, but the UE is currently camped on the E-UTRAN network and cannot receive paging from the MSC. message, eventually resulting in paging failure and circuit service interruption

[0006] From the above analysis, it can be found that in the CSFB scenario, when the UE executes a separate RAU process, the SGSN cannot accurately determine whether to activate the ISR, which seriously affects the user's service experience, including affecting the performance of the ISR or causing CS service interruption, etc.

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