TWI566552B - Method, device and communication system for reversed single radio voice call continuity handover - Google Patents

Description

Reverse single wireless voice call continuity switching method, device and communication system

The present invention relates to the field of communication technologies, and in particular to a reverse single wireless voice call continuity switching method, apparatus, and communication system.

In the existing mobile communication services, according to the network bearer mechanism, it can be divided into: 1. Services carried by the CS (Circuit Switch) domain, such as voice calls, short messages, and supplementary services; 2. Packet switching (PS, Packet Switch) The services carried by the domain include the data service and the session service. The session service can also be called the Voice over Internet Protocol (VoIP) service. The voice service can be carried in the CS domain or in the CS domain. In the PS domain, voice services sometimes switch between the CS domain and the PS domain due to problems such as signal coverage and network load. For example, when a user makes a voice call in a 2G or 3G CS domain, the call needs to be switched from the CS domain to the LTE or UTRAN due to the load of the CS network. This process is called reverse single wireless voice call continuity ( Reverse Single Radio Voice Call Continuity, rSRVCC ), the rSRVCC switch is essentially a CS domain to PS domain switch.

The PS domain is further divided into a home network PS domain (PS (h)) and a visited network PS domain (PS (v)), and is switched to a PS (v) domain or a PS in the CS domain ( h) When the domain is used, it is easy to cause sound delay in voice communication, and the sound delay to switch to the PS(v) domain is the most serious. In the document of 3GPP-TR23.885 [2], it is mentioned that the sound delay can not exceed 300 ms in roaming or non-roaming conditions, but the current situation is that voice resources are often established because of the network. Busy and long delays, especially in roaming conditions.

In view of the above, an object of the embodiments of the present invention is to provide a reverse single wireless voice call continuity switching method, apparatus, and communication system for reducing voice delay of rSRVCC handover.

To achieve the above object, an embodiment of the present invention provides a reverse single wireless voice call continuity rSRVCC handover method, which is applied to a first mobility management entity MME (v) in a visited network packet PS (v) domain, the method The method includes: receiving an rSRVCC pre-request message from the mobile switching center MSC; establishing an rSRVCC voice resource path according to the pre-request message; and sending a notification message including the voice resource path information to the MSC, to provide the voice resource path by using the MSC The information is sent to the user terminal UE, so that the UE acquires the voice resource according to the provided voice resource path.

Preferably, the pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain, and confirms that the UE can perform the request message sent after the rSRVCC handover.

Preferably, the step of establishing an rSRVCC voice resource path according to the pre-request message Specifically, the method includes: sending the pre-request message to a first IP multimedia system IMS (v) in the PS (v) domain; receiving a response message of the IMS (v), the response message including whether the IMS (v) can provide Information of the voice resource; according to the response message, notifying the first service gateway SGW (v) in the PS (v) domain and the first packet data gateway PGW (v) to establish an rSRVCC voice resource path.

Preferably, the step of establishing an rSRVCC voice resource path according to the pre-request message further comprises: sending the pre-request message to the second mobility management entity MME(h) in the home network packet PS(h) domain to a second IP multimedia system IMS(h) in the PS(h) domain; after the IMS (h) sends a response message to the second MME (h), the first MME (v) transmits the second MME (h) Notifying the second serving gateway SGW(h) and the second packet data gateway PGW(h) in the PS(h) domain to establish an rSRVCC voice resource path.

The embodiment of the present invention further provides a reverse single wireless voice call continuity rSRVCC handover method, which is applied to a second mobility management entity MME(h) in a home network packet PS(h) domain, and the method includes: receiving access An rSRVCC pre-request message of the first mobility management entity MME (v) in the network packet PS (v) domain; pre-establishing an rSRVCC voice resource path according to the rSRVCC pre-request message; transmitting the voice through the first MME (v) The notification message of the resource path information is sent to the mobile switching center MSC to provide the voice resource path information to the user terminal UE through the MSC, so that the UE acquires the voice resource according to the provided voice resource path.

Preferably, the resource request message is a request message that the first MME (v) responds to the MSC pre-request message; the MSC pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain and confirms that the UE can be executed. The request message sent after the rSRVCC switch.

Preferably, the step of pre-establishing the rSRVCC voice resource path according to the resource request message comprises: sending the pre-request message to the second IP in the PS (h) domain. a media system IMS (h); receiving a response message of the IMS (h), the response message including information about whether the IMS (h) can provide voice resources; and, according to the response message, notifying the second in the PS (h) domain The service gateway SGW(h) and the second packet data gateway PGW(h) establish an rSRVCC voice resource path.

The embodiment of the present invention further provides a reverse single wireless voice call continuity rSRVCC handover method, which is applied to a mobile switching center MSC, and the method includes: sending an rSRVCC pre-request message to a mobility management entity MME, so that the MME is based on the pre- The request message establishes a rSRVCC voice resource path, and receives a first notification message of the MME, where the first notification message includes the voice resource path information established by the MME, saves the voice resource path information, and receives a second notification message of the BS, where The second notification message includes the third information that the UE requests the rSRVSS switch. According to the second notification message, the voice resource path information is sent to the UE, so that the UE obtains the voice resource by using the voice resource path information.

Preferably, the step of sending the rSRVCC pre-request message to the mobility management entity MME further includes an acknowledgment step, which specifically includes: receiving a third notification message from the BS, where the third notification message includes the connection between the BS and the UE. After receiving the third notification message, the second information of the UE is obtained by the home subscriber system HSS; and according to the second information, whether the UE can perform rSRVSS handover is confirmed.

Preferably, the MME comprises a first mobility management entity MME (v) in the access network packet PS (v) domain and a first mobility management entity MME (h) in the home network packet PS (h) domain; the sending The step of the rSRVCC pre-request message to the mobility management entity MME, so that the MME establishes the rSRVCC voice resource path according to the pre-request message, specifically includes: sending an rSRVCC pre-request message to the first MME (v) to transmit the first MME ( v) notifying the first service gateway SGW (v) and the first packet data gateway SGW (v) in the PS (v) domain Establishing an rSRVCC voice resource path; receiving a fourth notification message of the first MME (v), where the fourth notification message includes voice resource path information of the SGW/PGW (v).

Preferably, the step of transmitting the rSRVCC pre-request message to the mobility management entity MME, so that the MME establishes the rSRVCC voice resource path according to the pre-request message, further comprising: sending the rSRVCC pre-request message by sending the first MME (v) Giving the second MME (h) to notify the second serving gateway SGW (h) and the second packet data gateway SGW (h) in the PS (h) domain to establish rSRVCC voice through the second MME (h) a resource path; receiving, by the first MME (v), a fifth notification message of the second MME (h), where the fifth notification message includes voice resource path information of the SGW (h) / SGW (h).

The embodiment of the present invention further provides a mobility management entity MME, which is applied to the access network packet PS (v) domain, the device includes: a first receiving module, an establishing module, and a first sending module, where: a receiving module, configured to receive a reverse single wireless voice call continuity rSRVCC pre-request message from the mobile switching center MSC; and a setup module, configured to establish an rSRVCC voice resource path according to the pre-request message; the first sending module, And sending, by the MSC, the voice resource path information to the user terminal UE, so that the UE acquires the voice resource according to the provided voice resource path.

Preferably, the pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain, and confirms that the UE can perform the request message sent after the rSRVCC handover.

Preferably, the establishing module further includes a second sending module, a second receiving module, and a first notification module, wherein: the second sending module is configured to send the pre-request message to the PS (v) domain The first IP multimedia system IMS(v); the second receiving module is configured to receive the IMS (v) response message, where the response message includes information about whether the IMS (v) can provide voice resources; a notification module, configured to notify the response message according to the response message The first serving gateway SGW(v) in the PS(v) domain and the first packet data gateway PGW(v) establish an rSRVCC voice resource path.

Preferably, the establishing module further includes a third sending module and a second notifying module: the third sending module is configured to pass the second mobility management entity MME in the home network packet PS(h) domain ( h) sending the pre-request message to the second IP multimedia system IMS (h) in the PS (h) domain; the second notification module is configured to send the IMS (h) to the second MME (h) After the response message, the second MME(h) notifies the second serving gateway SGW(h) and the second packet data gateway PGW(h) in the PS(h) domain to establish an rSRVCC voice resource path.

An embodiment of the present invention further provides a mobility management entity MME, which is applied to a home network packet PS(h), where the apparatus includes: a first receiving module, configured to receive a first mobile in a PS (v) domain of an access network packet The rSRVCC pre-request message of the MME (v); the establishing module, pre-establishing the rSRVCC voice resource path according to the pre-request message; and the first sending module, configured to send, by using the first MME (v) The notification message of the voice resource path information is sent to the mobile switching center MSC to provide the voice resource path information to the user terminal UE through the MSC, so that the UE acquires the voice resource according to the provided voice resource path.

Preferably, the resource request message is a request message that the first MME (v) responds to the MSC pre-request message; the MSC pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain and confirms that the UE can be executed. The request message sent after the rSRVCC switch.

Preferably, the establishing module further includes a second sending module, a second receiving module, and a notification module, wherein: the second sending module is configured to send the received resource request message to the PS (h) a second IP multimedia system IMS (h) in the domain; the second receiving module is configured to receive the response message of the IMS (h), the response message including the IMS (h) Providing information about the voice resource; the notification module is configured to notify the second service gateway SGW(h) and the second packet data gateway PGW(h) in the PS(h) domain to establish rSRVCC according to the response message Voice resource path.

The embodiment of the present invention further provides a mobile switching center MSC, where the apparatus includes: a first sending module, configured to send an rSRVCC pre-request message to the mobility management entity MME, so that the MME establishes an rSRVCC voice resource path according to the pre-request message. The first receiving module is configured to receive the first notification message of the MME, where the first notification message includes the voice resource path information established by the MME, and the saving module is configured to save the voice resource path information; a module, configured to receive a second notification message of the BS, where the second notification message includes the third information that the UE requests the rSRVSS switch; and the second sending module is configured to send the voice according to the second notification message. The resource path information is sent to the UE, so that the UE acquires the voice resource through the voice resource path information.

Preferably, the device further includes a third receiving module, an obtaining module, and a confirming module, wherein: the third receiving module is configured to receive a third notification message from the BS, where the third notification message includes the BS and the The UE establishes the first information of the connection; the obtaining module is configured to obtain the second information of the UE through the home subscription user system HSS after receiving the third notification message; the confirmation module is configured to use, according to the first Second, confirm whether the UE can perform rSRVSS handover.

Preferably, the MME comprises a first mobility management entity MME (v) in the access network packet PS (v) domain and a second mobility management entity MME (h) in the home network packet PS (h) domain; A transmitting module includes a third sending module and a fourth receiving module, wherein: the first sending module includes a third sending module and a fourth sending module, wherein: the third sending module is configured to send rSRVCC pre-request message to the first MME (v) to notify the first serving gateway SGW (v) and the first packet in the PS (v) domain through the first MME (v) The data gateway SGW (v) establishes an rSRVCC voice resource path; the fourth sending module is configured to send an rSRVCC pre-request message to the second MME (h) through the first MME (v) to transmit the second MME (h) Notifying the second serving gateway SGW(h) and the second packet data gateway SGW(h) in the PS(h) domain to establish an rSRVCC voice resource path.

Preferably, the first sending module further includes a fourth receiving module and a fifth receiving module, wherein: the fourth receiving module is configured to receive a fourth notification message of the first MME (v), where the The fourth notification message includes the voice resource path information of the SGW/PGW (v); the fifth receiving module is configured to receive, by using the first MME (v), the fifth notification message of the second MME (h), the fifth The notification message includes voice resource path information of SGW/PGW(h).

The embodiment of the present invention further provides a communication system, including: a first mobility management entity MME (v), a second mobility management entity MME (h), and a mobile switching center MSC, wherein: the MSC is configured to send an rSRVCC pre- Requesting a message to the first MME (v) and the second MME (h), so that the first MME (v) and the second MME (h) establish an rSRVCC voice resource path according to the pre-request message; and receive the first MME (v) a first notification message, the first notification message includes the voice resource path information established by the first MME (v) and the second MME (h); the voice resource path information is saved; and the second notification message of the BS is received, The second notification message includes the third information that the UE requests the rSRVSS switch; and, according to the second notification message, the voice resource path information is sent to the UE, so that the UE obtains the voice resource by using the voice resource path information; The first MME (v) is configured to receive an rSRVCC pre-request message of the MSC in the access network packet PS (v) domain; establish an rSRVCC voice resource path according to the pre-request message; and send the path information including the voice resource Notification message to the MSC; The second MME (h) serves the home network packet PS (h) domain, and is configured to receive the rSRVCC pre-request message forwarded by the first MME (v); and pre-establish an rSRVCC voice resource path according to the resource request message; Sending, by the first MME (v), a notification message containing the voice resource path information to the MSC.

Preferably, the first MME (v) is further configured to send the pre-request message to the first IP multimedia system IMS (v) in the PS (v) domain according to the pre-request message; receive the IMS (v) a response message, the response message including information about whether the IMS (v) can provide voice resources; and, according to the response message, notifying the first service gateway SGW (v) and the first packet data in the PS (v) domain The gateway PGW(v) establishes the rSRVCC voice resource path.

Preferably, the second MME (h) is further configured to send the pre-request message to the second IP multimedia system IMS (h) in the PS (h) domain according to the pre-request message; receive the IMS (h) a response message including information on whether the IMS (h) can provide a voice resource; according to the response message, notifying the second service gateway SGW (h) and the second packet data in the PS (h) domain The gateway PGW(h) establishes the rSRVCC voice resource path.

Preferably, the system further includes an evolved base station eNB, and after the UE is connected to the eNB, the voice resource of the IP multimedia system IMS is obtained according to the voice resource path information.

The rSRVCC handover method, apparatus, and system according to the embodiment of the present invention, when confirming that the UE is connected to the BS of the CS domain, that is, the MSC sends a pre-request message of the rSRVCC to the MME, so that the MME notifies the SGW and the PGW to establish a voice resource path in advance, so When the UE needs to switch from the CS domain to the PS domain (ie, the rSRVCC switchover), the IMS voice resource can be quickly obtained by using the pre-established voice resource path to complete the rSRVCC handover, thereby effectively reducing the voice delay of the rSRVCC handover, and the practice shows that With the above scheme, the delay time of rSRVCC roaming can be approximated by the delay time of non-roaming rSRVCC.

Compared with the existing mode, the embodiment of the present invention reduces the complexity and signaling data of the rSRVCC handover by using the voice resource path in advance, improves the execution success rate of the handover, and effectively reduces the voice delay of the rSRVCC handover, especially the roaming state. The voice delay of the rSRVCC switch.

The invention is described in detail below with reference to the accompanying drawings and specific embodiments.

100‧‧‧Communication system

110‧‧‧MSC

112‧‧‧First MME(v), MME

114‧‧‧Second MME(h), MME

1120, 1142, 1100‧‧‧ storage unit

1122, 1144, 1102‧‧ ‧ processing unit

1124, 1146‧‧‧ communication unit

1126, 1148, 1108‧‧‧ first receiving module

1128, 1150‧‧‧Building modules

1130, 1152, 1106‧‧‧ first transmission module

1132, 1154, 1114‧‧‧ second transmission module

1134, 1156, 1112‧‧‧ second receiving module

1136, 1158‧‧‧ first notification module

1138, 1106A‧‧‧ third transmission module

1140‧‧‧second notification module

1104‧‧‧Signal transmission module

1110‧‧‧Save module

1116A‧‧‧3rd receiving module

1116B‧‧‧Get Module

1116C‧‧‧Confirmation module

1106B‧‧‧fourth transmission module

1108A‧‧‧4th receiving module

1108B‧‧‧ fifth receiving module

It should be noted that the above modules may use the same name, but the connotations are not necessarily the same. For example, the first receiving module 1130 and the first receiving module 1106 are not the same, and the content of each module should be understood by It depends on the description in the embodiment.

1 is a block diagram of a communication system according to an embodiment of the present invention.

Figure 2 is a network architecture diagram of rSRVCC handover in the roaming state.

FIG. 3 is a flow chart showing the operation of the rSRVCC switching in the roaming state of the communication system according to the embodiment of the present invention.

4 is a functional block diagram of an MME according to an embodiment of the present invention.

FIG. 5 is a functional block diagram of an MME according to another embodiment of the present invention.

FIG. 6 is a functional block diagram of an MME according to another embodiment of the present invention.

FIG. 7 is a functional block diagram of an MSC according to another embodiment of the present invention.

FIG. 8 is a workflow diagram corresponding to the MSC of FIG. 7.

FIG. 9 is a functional block diagram of an MSC according to another embodiment of the present invention.

FIG. 10 is a workflow diagram corresponding to the MSC of FIG. 9.

FIG. 11 is a flowchart of a rSRVCC switching method according to an embodiment of the present invention.

FIG. 12 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention.

FIG. 13 is a flow chart corresponding to the switching method of FIG. 12 in a system environment.

FIG. 14 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention.

FIG. 15 is a corresponding working flow chart of the switching method of FIG. 14 in a system environment.

FIG. 16 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention.

FIG. 17 is a flow chart corresponding to the switching method of FIG. 16 in a system environment.

FIG. 18 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention.

FIG. 19 is a flow chart corresponding to the switching method of FIG. 18 in a system environment.

Technical terms and their abbreviations that may be involved in this embodiment: Base station: BS, Base Station

Evolved base station: eNB, Evolved NodeB

Circuit bearer domain: CS, Circuit Switch

Packet bearer domain: PS, Packet Switch

Home Subscriber System: HSS, Home Subscriber System

IP-based multimedia system: IMS, IP Multimedia System

Mobility Management Entity: MME, Mobile Management Entity

Mobile Switching Center: MSC, Mobile Switching Center

Packet data gateway: PGW/PDNGW, Packet Data Network Gateway

Service gateway: SGW, Serving Gateway

GPRS service support node: SGSN, Serving GPRS Support Node

Reverse Single Wireless Voice Call Continuity: rSRVCC, Reverse Single Radio Voice Call Continuity

User terminal: UE, User Equipment

Home network: (h), Home network

Visit the network: (v), Visit network

Roaming: roaming

For the convenience of those skilled in the art, the communication system for the rSRVCC handover is first introduced. FIG. 1 is a structural diagram of the communication system 100 of the present embodiment. The communication system 100 includes an MSC 110 and a first MME (v) 112. a second MME (v) 114, and an eNB, wherein: the MSC 110 is configured to send an rSRVCC pre-request message to the first MME (v) 112 and the second MME (h) 114, so that the first MME (v) And the second MME (h) 114 establishes an rSRVCC voice resource path according to the pre-request message; and receives a first notification message of the first MME (v) 112, where the first notification message includes the first MME (v) 112 and the The second MME (h) 114 establishes the voice resource path information; saves the voice resource path information; receives the second notification message of the BS, where the second notification message includes the third information that the UE requests the rSRVSS switch; and, according to the a second notification message, the voice resource path information is sent to the UE, so that the UE obtains a voice resource by using the voice resource path information; the first MME (v) 112 serves to access the network packet PS (v) domain, Receiving an rSRVCC pre-request message of the MSC 110; sending the pre-request message to The PS(v) domain The first IP multimedia system IMS (v); receiving the IMS (v) response message, the response message including information about whether the IMS (v) can provide voice resources; and notifying the PS (v) domain according to the response message The first service gateway SGW(v) and the first packet data gateway PGW(v) establish an rSRVCC voice resource path; send a notification message containing the voice resource path information to the MSC 110; the second MME (h) 114, serving in the home network packet PS (h) domain, for receiving the rSRVCC pre-request message forwarded by the first MME (v) 112; sending the pre-request message to the second in the PS (h) domain An IP multimedia system IMS (h); receiving a response message of the IMS (h), the response message including information about whether the IMS (h) can provide a voice resource; and, according to the response message, notifying the first in the PS (v) domain A service gateway SGW (v) and a first packet data gateway PGW (v) establish an rSRVCC voice resource path; and send, by the first MME (v) 112, a notification message containing the voice resource path information to the MSC 110.

After the UE accesses the eNB, the voice resource of the IP multimedia system IMS is obtained according to the voice resource path information.

The workflow of the communication system 100 in the roaming state will be described below in conjunction with FIGS. 2 and 3 to facilitate a clearer understanding of the working principle of the communication system 100 by those skilled in the art.

Figure 2 is a network architecture diagram of rSRVCC handover in the roaming state. That is, when the UE accesses the CS (h) domain of the home network, it may switch to the PS (v) domain of the access network, or may switch to the PS (h) domain of the home network through the PS (v) domain. 3 is a flow chart showing the operation of the communication system 100 for rSRVCC switching in the UE roaming state. It should be noted that, for clarity of presentation, multiple external devices may be involved, which are described first.

Step S110: The UE accesses the BS. Step S112: The BS notifies the MSC that the UE has been accessed. In step S114, the MSC sends a request message to the HSS to obtain related information of the UE from the HSS. Step S116: The MSC receives the feedback from the HSS. a message, the feedback message includes whether the UE can perform rSRVCC handover; in step S118, the MSC sends an rSRVCC pre-request message to the first MME (v); in step S120, the first MME (v) sends the pre-request message to the IMS (v) IMS (v) determines whether there is available voice resource; step S122, the first MME (v) receives the IMS (v) feedback message; step S124, the first MME (v) also forwards the pre-request message to the second MME (h); step S126, the second MME (h) sends the pre-request message to the IMS (h), the IMS (h) determines whether there is available voice resources; step S128, the second MME (h) receives the IMS (h) The feedback message is sent; in step S130, the first MME (v) and the second MME (h) establish a voice resource path of the rSRVCC roaming through the respective SGW (v), PGW (v), SGW (h), and PGW (h). Step S132, notifying the MSC of the established voice resource path information; in step S134, the MSC waits for the handover request of the rSRVCC of the BS to start the handover of the rSRVCC roaming; In step S136, switching of rSRVCC roaming is performed.

After the rSRVCC roaming handover is completed, the UE can access the IMS (v) and IMS (h) voice resources through the path of the SGW/PGW (v) and the SGW/PGW (h) through the eNB of the PS (v).

In the embodiment of the present invention, the MSC may be replaced by other network elements, such as the SGSN; the PWG may also be replaced by the PDN-GW, or replaced by other devices, and the present invention is not limited to the devices listed above.

FIG. 4 is a functional block diagram of the MME 112 according to an embodiment of the present invention. The MME 112 is applied to the access network packet PS(v) domain and includes a storage unit 1120, a processing unit 1122, and a communication unit 1124. The MME 112 further includes a first receiving module 1126, an establishing module 1128, and a first sending module 1130. The module is configured to be executed by one or more processors (the processing unit 1122 in this embodiment) to complete this invention. In the embodiment of the present invention, the module referred to as 1126~1130 is a computer program segment that performs a specific function, and is stored in the storage unit 1120. The first receiving module 1126 is configured to receive an rSRVCC pre-request message of the MSC. In this embodiment, the pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain, and confirms that the UE can perform the request message sent after the rSRVCC handover; the pre-request message further includes the number of the UE in the CS domain. News.

The module 1128 is configured to establish an rSRVCC voice resource path according to the pre-request message. In this embodiment, after receiving the pre-request message, a request is sent to the IMS in PS(v) and PS(h) to confirm whether voice resources are available, and after obtaining a positive response, the interface is notified. Establish a connection tunnel, that is, a voice resource path. It should be noted that multiple connection tunnels can be established and the quality of each connection tunnel can be detected.

The first sending module 1130 is configured to send a notification message including the voice resource path information to the MSC, to provide the voice resource path information to the user terminal UE through the MSC, so that the UE according to the provided voice resource path Get voice resources. In this embodiment, after the voice resource path information is sent to the MSC, the MSC temporarily stores the voice resource information and waits for the UE to request the packet. When the UE requests to switch from the CS domain to the PS domain, the MSC provides the information. For the UE, the UE quickly obtains the IMS voice resource through the eNB according to the voice resource path information, thereby reducing the voice delay of the rSRVCC handover and the delay in time.

FIG. 5 is a functional block diagram of an MME 112 according to another embodiment of the present invention. The MME 112 is applied to the access network packet PS(v) domain and includes a storage unit 1120, a processing unit 1122, and a communication unit 1124. The MME 112 further includes a first receiving module 1126, an establishing module 1128, and a first sending module 1130. The establishing module 1128 includes a second sending module 1132, a second receiving module 1134, and a first notification module 1136. The third sending module 1138 and the second notification module 1140. The module is configured to be executed by one or more processors (the processing unit 1122 in this embodiment) to complete the present invention. In the embodiment of the present invention, the module referred to as 1126~1140 is a computer program segment that performs a specific function, and is stored in the storage unit 1120. The first receiving module 1126 is configured to receive an rSRVCC pre-request message of the MSC. In this embodiment, the pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain, and confirms that the UE can perform the request message sent after the rSRVCC handover; the pre-request message further includes the number of the UE in the CS domain. News.

The module 1128 is configured to establish an rSRVCC voice resource path according to the pre-request message. The establishing module 1128 specifically includes: a second sending module 1132, a second receiving module 1134, a first notification module 1136, a third sending module 1138, and a second notification. Module 1140.

It should be noted that the second sending module 1132, the second receiving module 1134, and the first notification module 1136 are configured to enable the UE to acquire IMS (v) voice resources in the PS (v) domain of the access network; The sending module 1138 and the second notification module 1140 are configured to enable the UE to acquire IMS (h) voice resources in the home network PS (h) domain. The voice service provided by the IMS (h) voice resource in the home network PS (h) domain has a lower delay.

The second sending module 1132 is configured to send the pre-request message to the first IP multimedia system IMS (v) in the PS (v) domain. In this embodiment, after receiving the pre-request message, the IMS (v) detects whether the access network has available voice resources, that is, whether the VOIP (Voice over Internet Protocol) service can be provided, and responds with the detection result. MME 112.

The second receiving module 1134 is configured to receive the IMS (v) response message, where the response message includes information about whether the IMS (v) can provide voice resources.

The first notification module 1136 is configured to notify the first serving gateway SGW (v) and the first packet data gateway PGW (v) in the PS (v) domain to establish an rSRVCC voice resource path according to the response message. In this embodiment, the first notification module 1136 can establish a plurality of rSRVCC voice resource paths according to the number of interfaces between the SWG (v) and the PGW (v).

The third sending module 1138 is configured to send the pre-request message to the second IP multimedia in the PS (h) domain by using a second mobility management entity MME (h) in the home network packet PS (h) domain System IMS (h). In this embodiment, after receiving the pre-request message, the IMS (h) detects whether there is available voice resource in the home network, that is, whether the VOIP (Voice over Internet Protocol) service can be provided. The detection result is responsive to the MME 112.

The second notification module 1140 is configured to notify the second service gateway in the PS (h) domain through the second MME (h) after the IMS (h) sends a response message to the second MME (h) The SGW(h) and the second packet data gateway PGW(h) establish an rSRVCC voice resource path. In this embodiment, the second notification module 1140 can establish a plurality of rSRVCC voice resource paths according to the number of interfaces between the SWG(h) and the PGW(h).

The MME 112 in the implementation of the present invention further includes a first sending module 1130, configured to send a notification message including the rSRVCC voice resource path resource information established by the first notification module 1136 and the second notification module 1140 to the MSC. The voice resource path information is provided to the user terminal UE through the MSC, so that the UE acquires the voice resource according to the provided voice resource path. In this embodiment, after the voice resource path information is sent to the MSC, the MSC temporarily stores the voice resource information and waits for the UE to request the packet. When the UE requests to switch from the CS domain to the PS domain, the MSC provides the information. For the UE, the UE quickly obtains the voice resource of the IMS (v) or the IMS (h) through the eNB according to the voice resource path information, and preferentially acquires the voice resource of the IMS (h), thereby reducing the voice delay of the rSRVCC handover, that is, the time. The delay on.

FIG. 6 is a functional block diagram of an MME 114 according to another embodiment of the present invention. The MME 114 is applied to the access network packet PS(h) domain and includes a storage unit 1142, a processing unit 1144, and a communication unit 1146. The MME 114 further includes a first receiving module 1148, an establishing module 1150, and a first sending module 1152. The establishing module 1148 specifically includes a second sending module 1154, a second receiving module 1156, and a first notification module. 1158. The module is configured to be executed by one or more processors (processing unit 1144 in this embodiment) to complete the present invention. In the embodiment of the present invention, the module referred to as 1148~1158 is a computer program segment that performs a specific function, and is stored in the storage unit 1142. among them: The first receiving module 1148 is configured to receive an rSRVCC pre-request message of the first mobility management entity MME(v) 112 in the access network packet PS(v) domain. In this embodiment, the resource request message is a request message that the first MME (v) 112 responds to the MSC 110 pre-request message; the MSC pre-request message is that the MSC 110 learns that the UE is connected to the CS domain of the CS domain and It is confirmed that the UE can execute the request message sent after the rSRVCC handover. The pre-request message also includes information such as the number of the UE in the CS domain.

The module 1150 is established, and the rSRVCC voice resource path is pre-established according to the pre-request message. In this embodiment, after receiving the pre-request message, a request is sent to the IMS (h) in the PS (h) to confirm whether voice resources are available, and after a positive response is received, a connection is established between the notification interfaces. Tunnel, the voice resource path. It should be noted that multiple connection tunnels can be established and the quality of each connection tunnel can be detected. The establishing module 1148 specifically includes a second sending module 1154, a second receiving module 1156, and a first notification module 1158. The second sending module 1154 is configured to send the received resource request message to the second IP multimedia system IMS(h) in the PS(h) domain, and the second receiving module 1156 is configured to receive the IMS ( a response message of the h), the response message includes information about whether the IMS (h) can provide a voice resource; the first notification module 1158 is configured to notify the second service gate in the PS (h) domain according to the response message The track SGW (h) and the second packet data gateway PGW (h) establish an rSRVCC voice resource path.

The first sending module 1152 is configured to send, by using the first MME (v) 112, a notification message containing the voice resource path information to the mobile switching center MSC 110, to provide the voice resource path information to the user terminal through the MSC 110. The UE, so that the UE acquires voice resources according to the provided voice resource path. In this embodiment, after the voice resource path information is sent to the MSC 110, the MSC 110 temporarily stores the voice resource information and waits for the request packet of the UE. When the UE requests to switch from the CS domain to the PS domain, the MSC provides The information is sent to the UE, and the UE quickly obtains the voice resource of the IMS (h) according to the voice resource path information, thereby reducing the voice delay of the rSRVCC handover, that is, the delay in time.

FIG. 7 is a functional block diagram of an MSC 110 according to another embodiment of the present invention. FIG. 8 is a workflow diagram corresponding to the MSC of FIG. 7. The MSC 110 includes a storage unit 1100, a processing unit 1102, and a signal transmission unit 1104. The MSC 110 further includes a first sending module 1106, a first receiving module 1108, a saving module 1110, a second receiving module 1112, and a second sending module 1114. The module is configured to be executed by one or more processors (the processing unit 1102 in this embodiment) to complete the present invention. In the embodiment of the present invention, the module referred to as 1106~1114 is a computer program segment that performs a specific function, and is stored in the storage unit 1100.

The first sending module 1106 is configured to send an rSRVCC pre-request message to the mobility management entity MME 112, so that the MME establishes an rSRVCC voice resource path according to the pre-request message; of course, sending the pre-request message is confirming that the UE supports the rSRVCC switch. As a premise, the UE supports the handover from the CS domain to the PS domain.

The first receiving module 1108 is configured to receive the first notification message of the MME 112, where the first notification message includes the voice resource path information established by the MME. In this embodiment, after receiving the pre-request message of the first sending module 1106, the MME 112 notifies the SGW and the PGW to establish a voice resource resource path in advance, and after the establishment is completed, sends the established path information. To the MSC 110, the MSC is received by the first receiving module 1108.

The saving module 1110 is configured to save the voice resource path information. In this embodiment, the save module 1110 can be a variety of types of memory, and can also be a register or the like.

The second receiving module 1112 is configured to receive a second notification message of the BS, where the second notification message includes third information that the UE requests rSRVSS switching. That is, the rSRVCC handover request is awaiting. Specifically, when the BS detects that the UE wants to perform handover, the BS sends a handover request packet, that is, a second notification message, and the MSC 110 receives the second notification message through the second receiving module 1112.

The second sending module 1114 is configured to send the voice resource path information to the UE according to the second notification message, so that the UE obtains the voice resource by using the voice resource path information. The second sending module 1114 sends the voice resource path information in the save module 1110 to the UE, and the UE quickly obtains the voice resource of the IMS through the eNB according to the voice resource path information, thereby reducing the voice delay of the rSRVCC handover, that is, the time. The delay on.

FIG. 9 is a functional block diagram of an MSC 110 according to another embodiment of the present invention. FIG. 10 is a workflow diagram corresponding to the MSC of FIG. 9. The MSC 110 includes a storage unit 1100, a processing unit 1102, and a signal transmission unit 1104. The MSC 110 further includes a third receiving module 1116A, an obtaining module 1116B, a confirming module 1116C, a first sending module 1106, a first receiving module 1108, a saving module 1110, a second receiving module 1112, and a second The sending module 1114 includes a third sending module 1106A and a fourth sending module 1106B. The first receiving module 1108 further includes a fourth receiving module 1108A and a fifth receiving module 1108B. . The module is configured to be executed by one or more processors (the processing unit 1102 in this embodiment) to complete the present invention. In the embodiment of the present invention, the module referred to as 1106~1116 is a computer program segment that performs a specific function, and is stored in the storage unit 1100.

It should be noted that the third receiving module 1116A, the obtaining module 1116B, and the confirming module 1116C, the above three functional modules are used to confirm whether the UE supports rSRVCC switching in advance. In the roaming state, there will be a roaming process, such as from the access network PS (v) domain to the home network PS (h) domain, thus involving the first MME (v) 112 in the PS (v) domain and The second MME (h) 114 in the PS (h) domain.

The third receiving module 1116A is configured to receive a third notification message from the BS, where the third notification message includes the first information that the BS and the UE establish a connection.

The obtaining module 1116B is configured to obtain the second information of the UE through the home subscription user system HSS after receiving the third notification message.

The confirmation module 1116C is configured to confirm, according to the second information, whether the UE can perform rSRVSS switching.

The first sending module 1106 is configured to send an rSRVCC pre-request message to the mobility management entity MME, where the first sending module 1106 includes a third sending module 1106A and a fourth sending module 1106B: a third sending module 1106A Sending an rSRVCC pre-request message to the first MME (v) to notify the first serving gateway SGW (v) and the first packet data gateway in the PS (v) domain through the first MME (v) The SGW (v) establishes an rSRVCC voice resource path; the fourth sending module 1106B is configured to send an rSRVCC pre-request message to the second MME (h) by sending the first MME (v) to transmit the second MME (h) The second service gateway SGW(h) and the second packet data gateway SGW(h) in the PS(h) domain are notified to establish an rSRVCC voice resource path.

The first receiving module 1108 is configured to receive a first notification message of the MME, where the first notification message includes the voice resource path information established by the MME. The first receiving module 1108 further includes a fourth receiving module 1108A and a fifth receiving module 1108B. The fourth receiving module 1108A is configured to receive a fourth notification message of the first MME (v), the fourth notification. The message includes the voice resource path information of the SGW/PGW (v); the fifth receiving module The first notification message is sent by the first MME (v), and the fifth notification message includes the voice resource path information of the SGW/PGW (h).

The save module 1110 is configured to save the voice resource path information received by the fourth receiving module 1108A and the fifth receiving module 1108B. In this embodiment, the save module 1110 can be a variety of types of memory, and can also be a register or the like.

The second receiving module 1112 is configured to receive a second notification message of the BS, where the second notification message includes third information that the UE requests rSRVSS switching. That is, the rSRVCC handover request is awaiting. Specifically, when the BS detects that the UE wants to perform handover, the BS sends a handover request packet, that is, a second notification message, and the MSC 110 receives the second notification message through the second receiving module 1112.

The second sending module 1114 is configured to send the voice resource path information to the UE according to the second notification message, so that the UE obtains the voice resource by using the voice resource path information. The second sending module 1114 sends the voice resource path information in the save module 1110 to the UE, and the UE quickly obtains the voice resource of the IMS through the eNB according to the voice resource path information, thereby reducing the voice delay of the rSRVCC handover, that is, the time. The delay on.

FIG. 11 is a flowchart of a rSRVCC switching method according to an embodiment of the present invention. It should be noted that the embodiment of the present invention is mainly described by the MME 112. When understanding the present embodiment, reference may be made to the corresponding embodiment of FIG.

Step S210: Receive an rSRVCC pre-request message from the mobile switching center MSC 110. The pre-request message is that the MSC 110 learns that the UE is connected to the base station BS of the CS domain, and confirms that the UE can perform the request message sent after the rSRVCC handover; the pre-request message further includes the number information of the UE in the CS domain.

Step S212: Establish an rSRVCC voice resource path according to the pre-request message. In this embodiment, after receiving the pre-request message, a request is sent to the IMS in PS(v) and PS(h) to confirm whether voice resources are available, and after obtaining a positive response, the interface is notified. Establish a connection tunnel, that is, a voice resource path. It should be noted that multiple connection tunnels can be established and the quality of each connection tunnel can be detected.

Step S214: Send a notification message including the voice resource path information to the MSC 110 to provide the voice resource path information to the user terminal UE through the MSC 110, so that the UE acquires the voice resource according to the provided voice resource path. In this embodiment, after the voice resource path information is sent to the MSC 110, the MSC temporarily stores the voice resource information and waits for the UE to request the packet. When the UE requests to switch from the CS domain to the PS domain, the MSC provides the The information is sent to the UE, and the UE quickly obtains the IMS voice resource through the eNB according to the voice resource path information, thereby reducing the voice delay and time delay of the rSRVCC handover.

FIG. 12 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention. It should be noted that the embodiment of the present invention is mainly described by the MME 112 in the PS (v) domain of the access network. When the present embodiment is understood, reference may be made to the embodiment corresponding to FIG. 5.

Step S310, receiving an rSRVCC pre-request message from the mobile switching center MSC 110.

Step S312, sending the pre-request message to the first IP multimedia system IMS (v) in the PS (v) domain.

Step S314: Receive a response message of the IMS (v), where the response message includes information about whether the IMS (v) can provide voice resources.

When it is determined according to the information of step S314 that voice resources can be provided, the process proceeds to step S316. Step S316, according to the response message, notifying the first serving gateway SGW (v) in the PS (v) domain and the first packet data gateway PGW (v) to establish an rSRVCC voice resource path.

When it is determined according to the information of step S314 that the voice resource cannot be provided, the process proceeds to step S318: step S318, the second mobility management entity MME(h) in the home network packet PS(h) domain is sent, and the pre-request message is sent to the PS. (h) a second IP multimedia system IMS (h) in the domain; step S320, after the IMS (h) sends a response message to the second MME (h), the first MME (v) transmits the second MME ( h) Notifying the second serving gateway SGW(h) and the second packet data gateway PGW(h) in the PS(h) domain to establish an rSRVCC voice resource path.

After the rSRVCC voice resource path is established in step S316 or S320, the process proceeds to step S322: step S322, the notification message including the voice resource path information is sent to the MSC 110, to provide the voice resource path information to the user terminal UE through the MSC 110. So that the UE acquires voice resources according to the provided voice resource path.

In order to make the embodiments of the present invention more clear, a flow chart of operations in a specific environment as shown in FIG. 13 is provided for reference. In addition, the above S310 to S322 are merely an example for explaining the present invention, and are not intended to limit the present invention. For example, in actual operation, the exclusion condition may be deleted, and the voice resource resource path is simultaneously established in parallel in PS(v) and PS(h).

FIG. 14 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention. It should be noted that the embodiment of the present invention is applied to the second in the PS(h) domain of the home network packet. The mobility management entity second MME (h) 114 is explained as a main body. When understanding the present embodiment, reference may be made to the embodiment corresponding to FIG. 6.

Step S410: Receive an rSRVCC pre-request message of the first mobility management entity MME(v) 112 in the access network packet PS(v) domain. The resource request message is a request message that the first MME (v) 112 responds to the MSC 110 pre-request message; the MSC 110 pre-request message is that the MSC 110 learns that the UE is connected to the base station BS of the CS domain and confirms that the UE can A request message sent after the rSRVCC switch is performed.

Upon receiving the rSRVCC pre-request message, the rSRVCC voice resource path is pre-established. The specific steps are as follows: Step S412: Send the pre-request message to the second IP multimedia system IMS(h) in the PS(h) domain. In this embodiment, after receiving the pre-request message, the IMS (h) detects whether the access network has available voice resources, that is, whether the VOIP (Voice over Internet Protocol) service can be provided, and responds with the detection result. MME 114.

Step S414: Receive a response message of the IMS (h), where the response message includes information about whether the IMS (h) can provide voice resources.

Step S416, according to the response message, notifying the second serving gateway SGW(h) and the second packet data gateway PGW(h) in the PS(h) domain to establish an rSRVCC voice resource path. In this embodiment, multiple rSRVCC voice resource paths can be established according to the number of interfaces between SWG(h) and PGW(h).

Step S418, sending, by the first MME (v) 112, the notification MSC 110 that includes the voice resource path information, to provide the voice resource path information to the user terminal UE through the MSC 110, so that the UE is based on the provided voice resource. Path to obtain voice resources . In this embodiment, after the voice resource path information is sent to the MSC 110, the MSC 110 temporarily stores the voice resource information and waits for the request packet of the UE. When the UE requests to switch from the CS domain to the PS domain, the MSC provides The information is sent to the UE, and the UE quickly obtains the voice resource of the IMS (h) through the eNB according to the voice resource path information, thereby reducing the voice delay of the rSRVCC handover, that is, the delay in time.

In order to make the embodiments of the present invention more clear, a flow chart of operations in a specific environment as shown in FIG. 15 is provided for reference.

FIG. 16 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention. FIG. 17 is a flow chart corresponding to the switching method of FIG. 16 in a system environment. It should be noted that, in this embodiment, the MSC 110 is mainly used for the description. When the present embodiment is understood, reference may be made to the embodiments corresponding to FIGS. 7 and 8.

Step S510: Send an rSRVCC pre-request message to the MME, so that the MME establishes an rSRVCC voice resource path according to the pre-request message. In this embodiment, the transmission of the pre-request message is based on the premise that the UE supports the rSRVCC handover, that is, the UE supports the handover from the CS domain to the PS domain.

Step S512: Receive a first notification message of the MME, where the first notification message includes the voice resource path information established by the MME. In this embodiment, after receiving the pre-request message, the MME may notify the SGW and the PGW to establish a voice resource resource path in advance, and after the establishment is completed, feedback the established voice resource path path information.

Step S514, saving the voice resource path information. In this embodiment, a variety of types of memory may be used, or a temporary register or the like may be used.

Step S516, receiving a second notification message of the BS, where the second notification message includes third information that the UE requests rSRVSS handover. That is, waiting for the rSRVCC handover request, specifically, When the BS detects that the UE wants to perform handover, the BS sends a handover request packet, that is, a second notification message.

Step S518: Send the voice resource path information to the UE according to the second notification message, so that the UE acquires the voice resource by using the voice resource path information. The voice resource path information is sent to the UE, and the UE quickly obtains the voice resource of the IMS through the eNB according to the voice resource path information, thereby reducing the voice delay of the rSRVCC handover, that is, the time delay.

FIG. 18 is a flowchart of a rSRVCC switching method according to another embodiment of the present invention. FIG. 19 is a flow chart corresponding to the switching method of FIG. 18 in a system environment. It should be noted that, in this embodiment, the MSC 110 is mainly used for the description. When the present embodiment is understood, reference may be made to the embodiments corresponding to FIG. 9 and FIG.

In the roaming state, there will be a roaming process, such as from the access network PS(v) domain to the home network PS(h) domain, thus involving the first MME(v) 112 and PS in the PS(v) domain. (h) The second MME (h) 114 in the domain, the method is intended to disclose the method of rSRVCC handover in the roaming state.

Step S610: Receive a third notification message from the BS, where the third notification message includes the first information that the BS and the UE establish a connection. Step S612, after receiving the third notification message, obtain the information through the home subscription user system HSS. The second information of the UE; step S614, according to the second information, confirm whether the UE can perform rSRVSS switching.

Step S616, sending an rSRVCC pre-request message to the first MME (v), to notify the first serving gateway SGW (v) and the first packet data gate in the PS (v) domain through the first MME (v) The SGW (v) establishes an rSRVCC voice resource path; Step S618, receiving a fourth notification message of the first MME (v), where the fourth notification message includes voice resource path information of the SGW (v) / PGW (v).

Step S620: Send an rSRVCC pre-request message to the second MME (h) by sending the first MME (v) to notify the second serving gateway SGW in the PS (h) domain through the second MME (h) (h) establishing a rSRVCC voice resource path with the second packet data gateway SGW(h); step S622, receiving, by the first MME (v), a fifth notification message of the second MME (h), the fifth notification message The voice resource path information including SGW(h)/SGW(h).

Step S624, saving the voice resource path information. In this embodiment, a variety of types of memory may be used, or a temporary register or the like may be used.

Step S626: Receive a second notification message of the BS, where the second notification message includes third information that the UE requests rSRVSS handover. That is, waiting for the rSRVCC handover request, specifically, when the BS detects that the UE wants to perform handover, the BS sends a handover request packet, that is, a second notification message.

Step S628: Send the voice resource path information to the UE according to the second notification message, so that the UE obtains the voice resource by using the voice resource path information.

It should be noted that the execution conditions may be set before steps S620 and S622. If the voice resource path information is not obtained in step S618, S620 and S622 are performed.

It should be noted that the above-described embodiments do not constitute a limitation on the scope of the invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

S210~S214‧‧‧Steps

Claims (19)

A reverse single wireless voice call continuity rSRVCC handover method is applied to a first mobility management entity MME (v) in a visited network packet PS (v) domain, the method comprising: receiving an rSRVCC pre-from a mobile switching center MSC And the requesting message, according to the pre-request message, establishing the rSRVCC voice resource path, specifically: sending the pre-request message to the first IP multimedia system IMS (v) in the PS (v) domain; receiving the response of the IMS (v) a message, the response message including information about whether the IMS (v) can provide voice resources; and, according to the response message, notifying the first service gateway SGW (v) and the first packet data gateway PGW in the PS (v) domain (v) establishing a rSRVCC voice resource path; sending a notification message including the voice resource path information to the MSC, to provide the voice resource path information to the user terminal UE through the MSC, so that the UE according to the provided voice resource path Get voice resources. The method of claim 1, wherein the pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain, and confirms that the UE can perform the request message sent after the rSRVCC handover. The method of claim 1, wherein the step of establishing an rSRVCC voice resource path according to the pre-request message further comprises: transmitting, by the second mobility management entity in the PS(h) domain of the home network packet MME (h), sending the pre-request message to the second IP multimedia system IMS (h) in the PS (h) domain; after the IMS (h) sends a response message to the second MME (h), the first The MME (v) notifies the second serving gateway SGW (h) and the second packet data gateway in the PS (h) domain through the second MME (h) PGW(h) establishes the rSRVCC voice resource path. A reverse single wireless voice call continuity rSRVCC handover method is applied to a second mobility management entity MME(h) in a home network packet PS(h) domain, the method comprising: receiving an access network packet PS(v) domain The rSRVCC pre-request message of the first mobility management entity MME(v); pre-establishing the rSRVCC voice resource path according to the rSRVCC pre-request message, specifically: sending the pre-request message to the second in the PS(h) domain The IP multimedia system IMS (h); receiving the response message of the IMS (h), the response message includes information about whether the IMS (h) can provide voice resources; and according to the response message, notifying the first in the PS (h) domain The second service gateway SGW (h) and the second packet data gateway PGW (h) establish an rSRVCC voice resource path; send, by the first MME (v), a notification message containing the voice resource path information to the mobile switching center MSC, The voice resource path information is provided to the user terminal UE through the MSC, so that the UE acquires the voice resource according to the provided voice resource path. The method of claim 4, wherein the resource request message is a request message that the first MME (v) responds to the MSC pre-request message; the MSC pre-request message is that the MSC learns that the UE is connected. The base station BS of the CS domain confirms that the UE can perform the request message sent after the rSRVCC handover. A reverse single wireless voice call continuity rSRVCC handover method is applied to a mobile switching center MSC, the method comprising: sending an rSRVCC pre-request message to a mobility management entity MME, so that the MME is configured according to the MME The pre-request message establishes a rSRVCC voice resource path, and receives a first notification message of the MME, where the first notification message includes the voice resource path information established by the MME, saves the voice resource path information, and receives a second notification message of the BS. The second notification message includes the third information that the UE requests the rSRVSS switch, and sends the voice resource path information to the UE according to the second notification message, so that the UE obtains the voice resource by using the voice resource path information; The first mobility management entity MME (v) in the access network packet PS (v) domain and the first mobility management entity MME (h) in the home network packet PS (h) domain; the sending rSRVCC pre-request message to The step of the mobility management entity MME, so that the MME establishes the rSRVCC voice resource path according to the pre-request message, specifically includes: sending an rSRVCC pre-request message to the first MME (v), to notify the PS by using the first MME (v) (v) a first serving gateway SGW (v) in the domain and a first packet data gateway PGW (v) establishing an rSRVCC voice resource path; receiving a fourth notification message of the first MME (v), the fourth notification The message includes SGW(v)/P GW(v) voice resource path information. The method of claim 6, wherein the step of transmitting the rSRVCC pre-request message to the mobility management entity MME further comprises the step of confirming, comprising: receiving a third notification message from the BS, the third notification message And including the first information that the BS and the UE establish a connection; after receiving the third notification message, acquiring the UE by using the home subscription subscriber system HSS The second information; according to the second information, confirm whether the UE can perform rSRVSS switching. The method of claim 6, wherein the sending the rSRVCC pre-request message to the mobility management entity MME, so that the MME establishes the rSRVCC voice resource path according to the pre-request message, further comprising: transmitting the The first MME (v) sends an rSRVCC pre-request message to the second MME (h) to notify the second serving gateway SGW (h) and the second in the PS (h) domain through the second MME (h) The packet data gateway SGW(h) establishes an rSRVCC voice resource path; and receives, by the first MME (v), a fifth notification message of the second MME (h), where the fifth notification message includes SGW(h)/SGW(h) ) voice resource path information. A mobility management entity MME is applied to the access network packet PS(v) domain, the MME includes: a first receiving module, configured to receive a reverse single wireless voice call continuity rSRVCC pre-request message from the mobile switching center MSC And establishing a module, configured to establish an rSRVCC voice resource path according to the pre-request message; the establishing module further includes a second sending module, a second receiving module, and a first notification module, where: the second sending mode a group, configured to send the pre-request message to the first IP multimedia system IMS (v) in the PS (v) domain; the second receiving module is configured to receive the IMS (v) response message, the response message The first notification module is configured to notify the first service gateway SGW (v) and the first group in the PS (v) domain according to the response message, including information about whether the IMS (v) can provide voice resources. The data gateway PGW(v) establishes a rSRVCC voice resource path; and a first sending module, configured to send a notification message including the information of the voice resource path to the MSC, to provide the voice resource path information to the user terminal UE through the MSC, so that the UE obtains according to the provided voice resource path Voice resources. The MME of claim 9, wherein the pre-request message is that the MSC learns that the UE is connected to the base station BS of the CS domain, and confirms that the UE can perform the request message sent after the rSRVCC handover. The MME of claim 9, wherein the establishing module further comprises a third sending module and a second notifying module: the third sending module is configured to use the home network packet PS(h) The second mobility management entity MME(h) in the domain sends the pre-request message to the second IP multimedia system IMS(h) in the PS(h) domain; the second notification module is used for the IMS (h) after transmitting the response message to the second MME (h), notifying the second serving gateway SGW (h) and the second packet data gateway PGW in the PS (h) domain through the second MME (h) ( h) Establish a rSRVCC voice resource path. A mobility management entity MME is applied to a home network packet PS(h), the MME includes: a first receiving module, configured to receive a first mobility management entity MME (v) in a visited network packet PS (v) domain The rSRVCC pre-request message is set up, and the rSRVCC voice resource path is pre-established according to the pre-request message, the establishing module further includes a second sending module, a second receiving module, and a notification module, wherein: the second sending a module, configured to send the received resource request message to a second IP multimedia system IMS (h) in the PS (h) domain; the second receiving module is configured to receive the IMS (h) response Message, the response message includes the Whether the IMS (h) can provide information of the voice resource; the notification module is configured to notify the second service gateway SGW (h) and the second packet data gateway PGW in the PS (h) domain according to the response message (h) establishing a rSRVCC voice resource path; and the first sending module, configured to send, by using the first MME (v), a notification message containing the voice resource path information to the mobile switching center MSC, to provide the voice resource through the MSC The path information is sent to the user terminal UE, so that the UE acquires the voice resource according to the provided voice resource path. The MME of claim 12, wherein the resource request message is a request message that the first MME (v) responds to the MSC pre-request message; the MSC pre-request message is that the MSC learns that the UE is connected. The base station BS of the CS domain confirms that the UE can perform the request message sent after the rSRVCC handover. A mobile switching center MSC, the MSC includes: a first sending module, configured to send an rSRVCC pre-request message to the mobility management entity MME, so that the MME establishes an rSRVCC voice resource path according to the pre-request message; the first receiving module, a first notification message for receiving the MME, the first notification message includes the voice resource path information established by the MME, a saving module, configured to save the voice resource path information, and a second receiving module, configured to receive the a second notification message of the BS, the second notification message includes a third information that the UE requests the rSRVSS switch, and a second sending module, configured to send the voice resource path information to the UE according to the second notification message, so that Obtaining, by the UE, the voice resource by using the voice resource path information, where the MME includes a first mobility management entity MME (v) in the visited network packet PS (v) domain and a second in the home network packet PS (h) domain Mobility management entity MME(h); the first issue The sending module includes a third sending module and a fourth sending module, wherein: the third sending module is configured to send an rSRVCC pre-request message to the first MME (v) to transmit the first MME (v) Notifying the first service gateway SGW (v) in the PS (v) domain and the first packet data gateway SGW (v) to establish an rSRVCC voice resource path; the fourth sending module is configured to pass the first MME ( v) transmitting an rSRVCC pre-request message to the second MME (h) to notify the second serving gateway SGW (h) and the second packet data gateway in the PS (h) domain through the second MME (h) The SGW(h) establishes an rSRVCC voice resource path. The MSC of claim 14, wherein the MSC further includes a third receiving module, an obtaining module, and a confirming module, wherein: the third receiving module is configured to receive a third notification from the BS. The third notification message includes the first information that the BS and the UE establish a connection. The acquiring module is configured to obtain the second information of the UE by using the home subscription user system HSS after receiving the third notification message. The confirmation module is configured to confirm, according to the second information, whether the UE can perform rSRVSS switching. The MSC of claim 14, wherein the first sending module further includes a fourth receiving module and a fifth receiving module, wherein: the fourth receiving module is configured to receive the first MME (v) a fourth notification message, the fourth notification message includes voice resource path information of the SGW/PGW (v); the fifth receiving module is configured to receive the second MME by using the first MME (v) h) a fifth notification message including voice resource path information of the SGW/PGW (h). A communication system, comprising: a first mobility management entity MME (v), a second mobility management entity MME (h), and a mobile switching center MSC, wherein: the MSC is configured to send an rSRVCC pre-request message to the An MME (v) and a second MME (h), so that the first MME (v) and the second MME (h) establish an rSRVCC voice resource path according to the pre-request message; and receive a first notification of the first MME (v) a message, the first notification message includes the voice resource path information established by the first MME (v) and the second MME (h); the voice resource path information is saved; and the second notification message of the BS is received, the second notification message And the third information that is sent by the UE to the rSRVSS, and the voice resource path information is sent to the UE according to the second notification message, so that the UE obtains the voice resource by using the voice resource path information; the first MME (v Serving the rSRVCC pre-request message of the MSC in the access network packet PS (v) domain; establishing an rSRVCC voice resource path according to the pre-request message; sending a notification message including the voice resource path information to the MSC; the second MME (h) serving the attribution The network packet PS(h) field is configured to receive the rSRVCC pre-request message forwarded by the first MME (v); pre-establishing an rSRVCC voice resource path according to the resource request message; and transmitting, by using the first MME (v) a notification message of the voice resource path information to the MSC; wherein the first MME (v) is further configured to send the pre-request message to the first IP multimedia system in the PS (v) domain according to the pre-request message IMS (v); receiving the IMS (v) response message, the response message including information about whether the IMS (v) can provide voice resources; and, according to the response message, notifying the first service gate in the PS (v) domain The track SGW (v) and the first packet data gateway PGW (v) establish an rSRVCC voice resource path. The system of claim 17, wherein the second MME (h) is further For transmitting the pre-request message to the second IP multimedia system IMS(h) in the PS(h) domain according to the pre-request message; receiving the IMS (h) response message, the response message including the IMS ( h) Whether information of the voice resource can be provided; according to the response message, the second service gateway SGW(h) and the second packet data gateway PGW(h) in the PS(h) domain are notified to establish an rSRVCC voice resource path. The system of any one of the preceding claims, wherein the system further comprises an evolved base station eNB, and the UE is connected to the eNB, and obtains a voice resource of the IP multimedia system IMS according to the voice resource path information. .