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Method and system for realizing circuit switched fallback (CSFB) service in EPS

A technology of circuit switching fallback and implementation method, applied in the direction of electrical components, wireless communication, etc., can solve the problem that the same cannot be guaranteed, and achieve the effect of prolonging the service access time

Inactive Publication Date: 2013-06-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0040] As described in step 203, the E-UTRAN determines the target cell for fallback based on the radio signal quality reported by the UE. There is no guarantee that the MSC served by the target cell for the UE to fall back is the same MSC as the MSC that the UE jointly registers for in the EPS network.

Method used

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  • Method and system for realizing circuit switched fallback (CSFB) service in EPS
  • Method and system for realizing circuit switched fallback (CSFB) service in EPS
  • Method and system for realizing circuit switched fallback (CSFB) service in EPS

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Experimental program
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Embodiment 1

[0086] image 3 It is an embodiment where the target UTRAN network is under the jurisdiction of the MSC where the user jointly registers. The user terminal initiates a call on the EPS network, and the MME notifies the E-UTRAN to drop the user back to the UTRAN network. The target UTRAN network is within the jurisdiction of the MSC jointly registered by the user, including the following steps:

[0087] Step 301, the UE accesses the E-UTRAN network and successfully jointly registers with the MSC, the user initiates a call, and the UE finds that the current network cannot implement the call service of the CS network, then sends an enhanced service request message to the MME through the E-UTRAN network, The CSFB indication is carried in the message, which is used to notify the MME to handover the UE to the CS network;

[0088] Step 302. According to the CSFB instruction, the MME sends a notification CSFB message to the E-UTRAN, instructing the E-UTRAN to handover the UE to the CS...

Embodiment 2

[0111] Figure 4 is an embodiment where the target UTRAN network is not within the jurisdiction of the MSC where the user is jointly registered. The user terminal initiates a call on the EPS network, and the MME notifies the E-UTRAN to drop the user back to the UTRAN network. The target UTRAN network is not within the jurisdiction of the MSC that the user jointly registered, including the following steps:

[0112] Steps 401-407 are the same as 301-307;

[0113] In this embodiment, the MSC jointly registered by the UE is called a source MSC, and the MME sends a handover request to the source MSC.

[0114] Step 408, the source MSC selects the target MSC according to the target cell in the handover request message received, and sends a mobile application part (Mobile Application Part, MAP for short) message to the target MSC, indicating no bearer handover in the message;

[0115] The source MSC determines the target UTRAN to which the target cell belongs according to the target...

Embodiment 3

[0133] Figure 5 The target UTRAN network is within the jurisdiction of the MSC where the user jointly registers, the called embodiment. When the user terminal receives the called page on the EPS network (that is, the user terminal receives the page as the called party), the user terminal sends an enhanced service request to the MME through E-UTRAN, indicating CSFB, and the MME notifies E-UTRAN to drop the user back to UTRAN Network, the target UTRAN network is within the MSC jurisdiction of the user's joint registration, including the following steps:

[0134] Step 501, MSC receives remote PSTN address initial request;

[0135] Step 502, MSC sends a paging request to UE through MME;

[0136] Step 503, after the UE receives the paging request, the UE sends an enhanced service request message to the MME through the E-UTRAN network, and the message carries a CSFB indication;

[0137] Steps 504-512 are the same as steps 302-310;

[0138] Step 513, UE switches to the wireless ...

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Abstract

The present document discloses a method and system for enabling a Circuit Switched Fallback (CSFB) service in an Evolved Packet System (EPS). The method may include, after accessing an EPS network, the User Equipment (UE) triggering the CSFB service when it executes the Circuit Switching (CS) network service, and the UE transmitting a CS network service request carrying a CSFB indication to a Mobility Management Entity (MME). The method may also include, after receiving the CS network service request carrying the CSFB indication transmitted by the UE, the MME indicating an Evolved Universal Mobile Telecommunication System Radio Access Network (E-UTRAN) to switch the UE to the CS network, and the E-UTRAN initiating the switching to switch the UE to the CS network through an MME and the Mobile Switching Center (MSC) with which the UE jointly registers when accessing the EPS network.

Description

technical field [0001] The present invention relates to the field of mobile communication, and in particular to a method and system for a terminal to perform Circuit Switched Fallback (CSFB for short) under EPS (Evolved Packet Domain System) network access. Background technique [0002] In order to maintain the strong competitiveness of the third generation mobile communication system standardization project (3rd Generation Partnership Project, referred to as 3GPP) in the field of mobile communication, 3GPP is currently working on research on the packet switched core network (Packet Switched Core, referred to as PS Core) and the evolution of the Universal Mobile Telecommunication System RadioAccess Network (UTRAN for short), the purpose is to enable the evolved PS Core (EPC for short) to provide higher transmission rates and shorter transmission delays, And support E-UTRAN (EvolvedUTRAN, evolved UTRAN), GERAN (GSM EDGE radio access network, GSM EDGE wireless access network, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/00H04W64/00
CPCH04W36/14H04W36/0022
Inventor 陶全军
Owner ZTE CORP