CN101784089A

CN101784089A - Service processing method and related equipment

Info

Publication number: CN101784089A
Application number: CN200910005545A
Authority: CN
Inventors: 陈中平; 于益俊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-01-19
Filing date: 2009-01-19
Publication date: 2010-07-21

Abstract

The invention provides a service processing method and related equipment. The method comprises the following steps: obtaining the information about whether the indicated visit place supports circuit switched domain services over evolved packet switched access (CSoEPS); and determining whether the inter working function (IWF) serving user equipment (UE) is IWF of the visit place or the home according to the information about whether the indicated visit place supports CSoEPS and adopting the determined IWF to carry out service processing. The technical scheme provided by the invention can determine whether IWF serving UE is IWF of the visit place or the home according to the information about whether the visit place supports CSoEPS.

Description

Service processing method and related equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a service processing method and a related device.

Background

The CS (Circuit Switched) domain mainly handles voice services, and the signaling plane control entity of the CS domain is MSC (Mobile Switch Center)/VLR (Visitor location register). A Radio Access Network element BSS (Base Station Subsystem) in a GERAN (GSM EDGE Radio Access Network ) Network is connected to the MSC through an a interface, and a Radio Access Network element RNC (Radio Network Controller) in a UTRAN (UMTS terrestrial Radio Access Network, universal mobile telecommunications system terrestrial Radio Access Network) Network is connected to the MSC through an Iu-CS interface.

In order to meet the challenge of wireless broadband technology, a Long Term Evolution (LTE) plan is made, and a new architecture of a mobile communication network is correspondingly defined, where the architecture only reserves a Packet domain and is therefore called an Evolved Packet network (EPS), and a core network of the network mainly includes three logic functions, namely, an MME (Mobility Management Entity), an S-GW (Serving Gateway), and a PDN GW (PDN Gateway).

Because many services of an operator operate in a circuit domain, in order to reuse the existing CS service in LTE, a csoe (CS domain services over evolved PS access) architecture is proposed, the architecture connects an EPS network with a CS domain through IWF, and uplink signaling or data of the CS domain sent by UE is sent to MSC through IWF (Inter Working Function); the downlink signaling or data sent by the MSC is transmitted to the UE through the IWF, and the signaling or data interaction between the UE and the IWF is transmitted through the eNodeB and the S-GW/PDN-GW.

The UE is attached to the visited place and requests to establish an IP channel of the IWF of the visited place, but if the visited place does not support CSoEPS, the subsequent UE cannot perform service processing through the IP channel, namely the established IP channel has no meaning, and the waste of network resources is caused.

Or, the UE has already registered in the IWF of the home location, and if the UE is handed over to the visited location, the UE may cause interruption of voice communication during subsequent handover.

Disclosure of Invention

The embodiment of the invention provides a business processing method and related equipment, which are used for determining IWFs capable of serving UE and utilizing the determined IWFs to process business.

In view of this, the embodiment of the present invention provides:

a service processing method comprises the following steps:

acquiring information indicating whether a visited place supports circuit domain services to access CSoEPS through an evolved packet domain;

and determining whether the interworking function IWF serving the UE is the IWF of the visited place or the IWF of the home place according to the information indicating whether the visited place supports CSoEPS, and performing service processing by adopting the determined IWF.

A method for processing service, the method comprising:

receiving a Packet Data Network (PDN) connection request message sent by UE;

determining whether an interworking function IWF serving the UE is a visited place IWF or a home place IWF according to whether the visited place supports circuit domain services to access CSoEPS through an evolved packet domain;

and sending a PDN connection receiving message to the UE, wherein the PDN connection receiving message comprises the determined IWF information for providing service for the UE, so that the UE adopts the determined IWF to perform service processing.

A user equipment, comprising:

an indication information acquisition unit, configured to acquire information indicating whether a visited place supports circuit domain services to access the csoesps through an evolved packet domain;

a first determining unit, configured to determine, according to the information indicating whether the visited place supports csoess, whether an interworking function IWF serving for the UE is an IWF of the visited place or an IWF of the home place;

and the processing unit is used for carrying out service processing by adopting the determined IWF.

A mobility management network element comprising:

a message receiving unit, configured to receive a packet data network PDN connection request message sent by a UE;

a second determining unit, configured to determine, after receiving the PDN connection request message sent by the UE, whether an interworking function IWF serving the UE is a visited IWF or a home IWF;

and a message sending unit, configured to send a PDN connection acceptance message to the UE, where the PDN connection acceptance message includes the determined IWF information for providing the service for the UE, so that the UE performs service processing using the determined IWF.

The embodiment of the invention acquires the information indicating whether the visited place supports the CSoEPS to know whether the visited place supports the CSoEPS and determines whether the IWF serving the UE is the IWF of the visited place or the IWF of the home according to whether the visited place supports the CSoEPS, so that the UE can utilize the determined IWF to process the service, and the resource waste or service interruption caused by the fact that the UE determines the IWF which cannot provide the service for the UE is avoided.

Drawings

Fig. 1 is a csoesps architecture diagram.

Fig. 2 is a flowchart of a service processing method according to an embodiment of the present invention;

fig. 3 is a flowchart of a service processing method according to a second embodiment of the present invention;

fig. 4 is a flowchart of a service processing method provided by the third embodiment of the present invention;

fig. 5 is a flowchart of a service processing method provided by the fourth embodiment of the present invention;

fig. 6 is a flowchart of a service processing method provided in the fifth embodiment of the present invention;

fig. 7 is a structure diagram of a ue according to a sixth embodiment of the present invention;

fig. 8 is a diagram of a mobility management network element structure according to a seventh embodiment of the present invention.

Detailed Description

To make the embodiment of the present invention more clear, a csoess architecture is briefly described first, as shown in fig. 1, a PDN GW in an EPS network is connected to an MSC of a traditional CS core network through an IWF, and the IWF has the capability of simulating an Iu-CS/a interface. The EPS network is connected with the CS domain by the IWF. Under the above architecture, the UE performs signaling and data interaction with the IWF through Z1. Logically, the UE sends uplink signaling or data of the CS domain from Z1 to IWF, which simulates Iu-CS/a interface, that is, simulates the function of BSS/RNS (Radio Network Subsystem) to send uplink signaling or data to MSC; the processing of the downlink signaling is similar, the MSC sends the downlink signaling or data to the IWF, and the IWF sends the downlink signaling or data of the CS domain to the UE from Z1. For the MSC, the IWF it sees is actually considered to be a BSS/RNS. In practice, the signaling or data interaction between the UE and the IWF is carried over the user plane tunnel (IP tunnel) of the EPS network, so their true delivery is between the UE, the eNodeB, the S-GW/PDN-GW, and the IWF.

The first embodiment is as follows:

an embodiment of the present invention provides a service processing method, where the method includes:

determining whether an interworking function IWF serving the UE is an IWF of the visited place or an IWF of the home place according to the information indicating whether the visited place supports CSoEPS;

and performing service processing by using the determined IWF.

Wherein, the execution subject of the method can be UE.

Wherein, the service processing by adopting the determined IWF comprises the following steps: if the IWF serving the UE is determined to be the IWF of the visited place, sending a registration request to the IWF of the visited place; and if the IWF serving the UE is determined to be the IWF of the attribution, sending a registration request to the IWF of the attribution. If the IWF serving the UE is determined to be the IWF of the visited place, sending a registration request to the IWF of the visited place; if the IWF serving the UE is determined to be the IWF of the attribution, maintaining the registration of the IWF of the attribution; uplink signaling or data of a CS domain sent by subsequent UE is sent to the MSC through the determined IWF; and downlink signaling or data sent by the MSC is transmitted to the UE through the IWF.

In the first embodiment of the present invention, whether the visited place supports the csoess is obtained by obtaining the information indicating whether the visited place supports the csoess, and whether the IWF serving the UE is the visited place IWF or the home IWF is determined according to whether the visited place supports the csoess, so that the UE can perform service processing by using the determined IWF, thereby avoiding interruption of voice communication due to failure during subsequent handover.

For the following embodiments to be clearly understood, a simple introduction is first made to the LBO (Local Breakout) bearer and the HRO (Home Routed) bearer:

when the UE accesses in the visited place, if the visited place supports csoess and the PDNGW and IWF serving the UE are both located in the visited place, the bearer between the UE and the PDN GW in the visited place is called LBO (local triggered) bearer;

when the UE accesses the visited place, the PDN GW and the IWF serving the UE are both located in the Home location, and the bearer between the UE and the PDN GW in the Home location is called an HRO (Home Routed) bearer.

Example two:

referring to fig. 2, an embodiment of the present invention provides a service processing method, where when a UE is powered on and attached to a visited place, the UE acquires information indicating whether the visited place supports csoess, and determines whether an IWF serving the UE is an IWF of the visited place or an IWF of a home location according to the information indicating whether the visited place supports csoess, where the method includes:

a1, UE sends non-access stratum NAS Request message to MME of visited place, which can be Attach Request or TAU Request.

A2, MME sends NAS accept message to UE, where the message carries information indicating whether the visited place supports csoesps, where the information indicating whether the visited place supports csoesps may be an indication cell, such as a csoesps Supported cell or a csoess Indicator cell, or may be a special bit, such as 0 indicating that the visited place does not support csoesps, and 1 indicating that the visited place supports csoesps.

A3, UE sends a packet data network PDN connection Request message (PDN Connectivity Request) to MME, the message carries APN (Access Point name) information, wherein the APN information is used for notifying which network the PDN connection leads to; if the visited support supports CSoEPS, determining that the IWF serving the UE is the IWF of the visited place, wherein a PDN connection request message sent by the UE to the MME carries information indicating establishment of LBO mode bearer, such as an LBOIdicator; if the visited place does not support csoess, it is determined that the IWF serving the UE is the IWF of the Home place, and the PDN connection request message sent by the UE to the MME carries information indicating establishment of an HRO bearer, such as a Home Routed Indicator.

In this step, the purpose that the UE determines whether the IWF serving itself is the IWF of the visited place or the IWF of the home place is achieved, and the UE sends the PDN connection request message to the MME to request the MME to establish an IP tunnel to the IWF serving the UE.

A4, MME selects P-GW through APN, and establishes exclusive load with S-GW/P-GW.

If the PDN connection request message carries information indicating establishment of LBO mode bearing, the MME selects P-GW of the visited network, and if the PDN connection request message carries information indicating establishment of HRO mode bearing, the MME selects P-GW of the home network.

A5, MME replies PDN connection accept message (PDN Connectivity Response) to UE.

The PDN connection establishment procedure, which is a prerequisite for the UE to complete the IWF registration and to complete the CS domain registration, has been completed so far. The PDN connection is actually established for the UE to the IWF as an IP tunnel. The signaling interaction between the UE and the IWF and the signaling or data interaction between the UE and the MSC through the IWF are realized through the channel.

A6, UE sends registration request message to IWF serving UE through the above IP channel.

In this step, there are at least two ways for the UE to send a registration request message to the IWF serving it, one of which is: in the PDN connection establishment process, a network side (MME or P-GW) provides the address information of IWF for UE; UE sends register request message to IWF through IP channel according to address information of IWF; the other is as follows: in the PDN connection establishment procedure, the network side (MME or P-GW) sends a server address (which may be carried by a PDN connection acceptance message) to the UE, and it needs to be noted that the network side learns, through a PDN connection request message, whether the UE indicates establishment of an LBO bearer or an HRO bearer, and therefore the network side knows whether the address of the server at the visited location or the address of the server at the home location should be sent to the UE; the UE requests the address information of the IWF from the server sent by the network side, and directly sends the registration request message to the IWF through an IP channel according to the address information of the IWF.

A7, the IWF serving the UE replies to the UE with a registration accept message. To this end, the UE completes the procedure to IWF registration.

The above steps A6-A7 are the registration process of the UE to the IWF, the steps A3-A5 are the precondition of the UE completing the registration, and the steps A3-A7 can be regarded as a complete registration process in the present invention.

The UE will then register with the MSC and subsequent traffic can be passed between the UE, eNodeB, S-GW/PDN-GW, IWF and MSC. The method specifically comprises the following steps: UE sends the up signaling or data of CS domain to IWF, IWF simulates Iu-CS/A interface to send up signaling or data to MSC; MSC sends downlink signaling or data to IWF, IWF sends downlink signaling or data to UE, signaling or data interaction between UE and IWF is transmitted through eNodeB, S-GW/PDN-GW.

In this embodiment, the UE obtains the information indicating whether the visited place supports the csoesps from the network side through the NAS accept message, and the UE may also obtain the information indicating whether the visited place supports the csoesps in other manners, for example, the UE uses a broadcast message sent by the visited base station to indicate whether the visited place supports the csoesps, and knows whether the visited place supports the csoesps according to the broadcast message. The broadcast message sent by the visited base station is used to indicate whether the visited base station supports csoesps, which may be, but is not limited to, the following two ways:

the first mode is as follows: the broadcast message carries information indicating whether the visited place supports csoesps, that is, whether the visited place supports csoesps is indicated by using a certain cell or a special bit.

The second mode is as follows: if the visit support supports the information of the CSoEPS, the broadcast message carries the information indicating that the visit support supports the CSoEPS, if the visit place does not support the CSoEPS, the broadcast message does not carry the information indicating whether the visit place supports the CSoEPS, and the UE can default to the visit place not supporting the CSoEPS.

The second UE of the embodiment of the invention acquires the information indicating whether the visited place supports the CSoEPS or not to know whether the visited place supports the CSoEPS or not, and decides whether to register the IWF of the visited place or to register the IWF of the home place according to whether the visited place supports the CSoEPS or not, thereby avoiding the waste of network resources caused by establishing an IP channel between the UE and the IWF of the visited place when the visited place does not support the CSoEPS, and simultaneously avoiding the interruption of subsequent voice communication when the visited place is switched due to the fact that the relevant flow of registering the IWF of the visited place is not executed when the visited place supports the CSoEPS.

It should be noted that: the second embodiment is described in a scenario where the UE starts to attach to the visited place, if the UE has already registered to an IWF (IWF of the visited place) in the home place, and then switches to the visited place, the UE knows whether the visited place supports csoesps in an NAS flow or a broadcast message of a base station, and if the visited place supports csoess, sends a PDN connection request indicating to establish an LBO method to the MME, the MME establishes a bearer with a PDN GW of the visited place to provide an IP channel for the IWF of the UE to the visited place, and then the UE registers to the IWF of the visited place; if the visited place does not support CSoEPS, the registration of the IWF at the home place is continuously maintained.

Example three:

referring to fig. 3, a third embodiment of the present invention provides a service processing method, which is different from the second embodiment in that a UE further obtains information indicating whether to allow establishment of an LBO bearer for the UE at a visited place, and determines whether an IWF serving the UE is an IWF of the visited place or an IWF of a home according to the information indicating whether the visited place supports a csoess and the information indicating whether to allow establishment of an LBO bearer for the UE at the visited place, where the method includes:

b1, the UE sends NAS Request message to the MME of the visited place, where the NAS Request message may be Attach Request or TAU Request.

B2, MME knows whether the visited place supports CSoEPS according to the preset information, and determines whether LBO mode bearing is allowed to be established for the UE at the visited place according to the preset information or the subscription data or roaming protocol acquired from HSS, and sends NAS receiving information to the UE, wherein the information carries the strategy information for establishing voice bearing; the strategy information for establishing the voice bearer comprises the following steps: the information indicating whether the visited place supports CSoEPS and the information indicating whether LBO mode bearing is allowed to be established for the UE at the visited place.

Specifically, the policy information for establishing the voice bearer may carry a "csoes Supported and LBO Supported" cell to indicate that the visited location supports csoes, and support establishment of an LBO bearer for the UE at the visited location.

B3, UE sends a PDN connection request message to MME, the message carries APN information, when the visit supports CSoEPS and allows to establish LBO mode bearing for the UE at the visit place, the UE determines that the IWF serving for the UE is the IWF of the visit place, the PDN connection request message carries information indicating the establishment of LBO mode bearing, such as LBO Indicator; if the visited place does not support CSoEPS, the UE determines that the IWF serving for the UE is the IWF of the Home place, and the PDN connection request message carries information indicating establishment of HRO mode bearer, such as a Home Routed Indicator; if the visited support supports CSoEPS, but the UE is not allowed to establish the LBO mode bearer at the visited place, the UE determines that the IWF serving for the UE is the IWF of the home place, and the PDN connection request message carries information indicating establishment of the HRO mode bearer.

B4, MME selects P-GW through APN and creates special load with S-GW/P-GW.

B5, MME replies PDN connection acceptance message to UE, the message carries the addressing information of IWF corresponding to the bearing mode.

B6, UE sends register request message to IWF through the IP channel according to IWF addressing information, the message carries UE ID IMSI (International Mobile subscriber identity Number), UE current cell information and so on.

B7, IWF processes the register request of UE, and replies register acceptance message to UE, the message carries the related information of IWF.

The UE will then register with the MSC and subsequent voice traffic can be transferred between the UE, the eNodeB, the S-GW/PDN-GW, the IWF, and the MSC.

In the third embodiment of the present invention, the UE acquires the information indicating whether the visited place supports csoess and the information indicating whether the LBO bearer is allowed to be established in the visited place for the UE, so as to obtain the information indicating whether the visited place supports csoess and the information indicating whether the LBO bearer is allowed to be established in the visited place, and determine whether to register to the IWF of the visited place or to register to the IWF of the home place according to the two information indicating, thereby avoiding the waste of network resources and the delay of service development caused by establishing an IP channel between the UE and the IWF of the visited place when the visited place does not support csoess, and avoiding the interruption of voice communication when the visited place is switched due to the fact that the IP channel between the UE and the IWF of the visited place is not required to be established when the visited place supports csoess and the IWF of the visited place cannot be completed.

It should be noted that: the third embodiment is described in a scenario where the UE starts to attach to the visited place, if the UE has already registered to an IWF (IWF of the visited place) in the home place, and then switches to the visited place, the UE learns in the NAS flow whether the visited place supports csoess and allows to establish a bearer in an LBO manner for the UE in the visited place, and if the visited place supports csoess and allows to establish a bearer in an LBO manner for the UE in the visited place, sends a PDN connection request indicating establishment of the bearer in the LBO manner to the MME, the MME establishes a bearer with a PDN GW of the visited place to provide an IP channel for the IWF of the UE to the visited place, and then the UE registers with the IWF of the visited place; if the visited place does not support CSoEPS or the visited place supports CSoEPS but does not allow establishing LBO mode bearing for the UE at the visited place, continuing to maintain the registration of the IWF at the home place.

Example four:

referring to fig. 4, a fourth embodiment of the present invention provides a service processing method, where when a UE is powered on and attached to a visited place, or the UE is switched from a home location to the visited place, an MME determines whether an IWF serving the UE is an IWF of the visited place or an IWF of the home location, where the method includes:

c1, the UE sends a PDN connection request message to the MME, where the message carries a standardized APN to indicate that the PDN connection is for carrying a voice service, or carries an APN and indication information corresponding to the APN, where the indication information is used to indicate that the PDN connection corresponding to the APN is for carrying a voice service.

C2, MME knows whether the visited place supports CSoEPS according to the preset information, determines the IWF serving the UE, if the visited place supports CSoEPS, determines the IWF serving the UE as the IWF of the visited place; if the visited place does not support CSoEPS, determining that the IWF serving the UE is the IWF of the home place; further, it can also know whether the visited place supports csoess according to the preset information, and according to the preset information or the subscription data or roaming protocol acquired from HSS, determine whether to allow to establish a LBO mode bearer for the UE at the visited place, when the visited place supports csoess and supports to establish a LBO mode bearer for the UE at the visited place, determine that the IWF serving the UE is the IWF of the visited place, should establish a LBO mode bearer for the UE, select the P-GW visiting the network according to APN, and establish an IP channel with S-GW/P-GW; when the visited place does not support CSoEPS, determining that the IWF serving the UE is the IWF of the home place, and establishing HRO mode bearing for the UE; when the visit support supports CSoEPS but does not support establishing LBO mode bearing for the UE in the visit place, determining that the IWF serving for the UE is the IWF of the home location, establishing HRO mode bearing for the UE, selecting P-GW of the home network according to APN, and establishing an IP channel between the P-GW and S-GW/P-GW.

If the default visit supports the csoess, it is determined that the IWF serving the UE is the IWF of the visited place or the IWF of the home location according to whether the visited place supports the csoess, and specifically: when CSoEPS is supported by visit, determining that the IWF serving the UE is the IWF of the visit place; when the visited place does not support CSoEPS, determining that the IWF serving the UE is the IWF of the home place.

C3, MME replies PDN connection acceptance message to UE, the message carries the related information of IWF corresponding to the bearing mode. That is, if the IWF serving the UE is determined to be the IWF of the home, the PDN connection accept message carries the relevant information of the IWF of the home; and if the IWF serving the UE is determined to be the IWF of the visited place, carrying the relevant information of the IWF of the visited place in the PDN connection acceptance message.

C4, UE sends register request message to IWF through the IP channel, the message carries UE ID IMSI, UE current cell information and so on.

Wherein, the relevant information of the IWF in step C3 may be address information of the IWF, and in this step, the UE directly sends a registration request message to the IWF through the IP channel according to the address information of the IWF; or, the above-mentioned information related to the IWF is the address of a server capable of allocating the IWF, the UE requests the address information of the IWF from the server, and the UE directly sends the registration request message to the IWF through the IP channel according to the address information of the IWF.

C5, IWF processes UE register request, and replies register acceptance message to UE, the message carries IWF relative information.

In the fourth embodiment of the present invention, the MME determines whether the IWF serving the UE is the IWF of the visited place or the IWF of the home place according to whether the visited place supports the csoess and whether the LBO mode is allowed to be established for the UE in the visited place, so as to determine whether the bearer of the LBO mode or the bearer of the HRO mode is established for the UE, thereby avoiding the waste of network resources caused by establishing the IP channel between the UE and the IWF of the visited place when the visited place does not support the csoess; while avoiding subsequent interruption of voice communication at visitor handover due to non-execution of associated procedures for registration to visitor IWF while visitor supporting csoess.

Example five:

referring to fig. 5, a fifth embodiment of the present invention provides a service processing method, where when a UE is powered on and attached to a visited place, an IWF in a home informs the UE of whether an IWF serving the UE is the IWF in the visited place or the IWF in the home place, where the method specifically includes:

d1, UE sends PDN connection request message to MME, the message carries APN information and information for indicating establishment of HRO mode bearing.

The message may not carry information indicating establishment of the bearer in the HRO mode, and the MME defaults to establishment of the bearer in the HRO mode.

D2, MME selects P-GW1 in the home network according to APN, and establishes connection to P-GW1 and S-GW.

D3, MME sends PDN connection acceptance message to UE, the message carries the related information of IWF1 (home IWF) corresponding to HRO mode bearer.

D4, the UE uses the HRO mode to carry the relevant information of the corresponding IWF1, and sends a registration request to the IWF1, where the registration request carries the IMSI of the UE, the current cell information of the UE, and a PLMN (public land Mobile Network) message.

In this step, other relevant registered messages may be used instead of the registration request, which does not affect the implementation of the present invention.

D5, IWF1 determines that the UE is in the visited place according to the current cell information or PLMN information of the UE, knows whether the visited place supports CSoEPS or not according to the configuration of an operator, if the visited place does not support CSoEPS, IWF1 replies a registration acceptance message to the UE, and IWF1 is the IWF serving the UE; if CSoEPS is supported by the visit, the IWF1 determines that IWF2 (the IWF of the visited place) is the IWF serving the UE and sends a registration transfer message to the UE carrying the address information (e.g., IP address information) of the IWF2 of the visited place and its corresponding indication to inform the UE that this is the IWF of one of the visited places.

It should be noted that: the step may also be configured according to an operator, to learn whether to allow establishing an LBO mode bearer for the UE in the visited place, and when the visited place supports csoess and allows establishing an LBO mode bearer for the UE in the visited place, determine that an IWF serving the UE is an IWF2 (IWF of the visited place), and send a registration transfer message to the UE; when the visited place does not support the CSoEPS, or when the visited place supports the CSoEPS but does not allow the LBO mode bearer to be established for the UE at the visited place, the IWF1 replies a registration acceptance message to the UE, and the IWF1 is the IWF serving the UE;

this embodiment assumes that the IWF1 sends a registration transfer message to the UE.

D6, UE initiates PDN connection request message in visit place again, the message carries APN information and information of indicating establishing LBO mode bearing.

D7, MME selects PDN GW2 of the visited place according to APN, and establishes a special bearer with S-GW/PDN GW 2.

D8, MME sends a PDN connection acceptance message to the UE.

To this end, the UE establishes an IP tunnel to the IWF 2.

D9, UE sends registration request to IWF 2.

The D10, IWF2 replies to the UE with a registration accept message.

The UE then performs a registration procedure with the MSC, and subsequent voice traffic can be transferred between the UE, the eNodeB, the S-GW/PDN-GW2, the IWF2, and the MSC.

It should be noted that: the visited IWF2 address provided by the home IWF1 may be a default IWF address, and when the UE registers with the default IWF2 at the visited place, if the IWF2 cannot serve the UE, the IWF2 may provide the UE with address information of the IWF3 of the UE which can be served in the visited place, and the UE then initiates a registration request to the IWF 3.

In the fifth embodiment of the present invention, when the UE sends the registration request to the IWF of the home location, the IWF of the home location finds that the UE is in the visited network, and according to the configuration of the operator, if the visited network supports csoess, the IWF of the home location provides the IWF of the visited location to the UE, the UE knows that the visited network supports csoess, and can select the IWF of the visited location to serve itself. Subsequently, the PDN connection request sent by the UE to the MME carries information indicating establishment of an LBO mode bearer, the bearer between the MME and the PDN GW of the visited place provides an IP channel for the IWF from the UE to the visited place, and then the UE registers with the IWF of the visited place, so that the interruption of subsequent voice communication during switching at the visited place due to the fact that CSoEPS is supported at the visited place but the IWF of the visited place is not registered is avoided.

Example six:

referring to fig. 6, a sixth embodiment of the present invention provides a service processing method, where a UE already registers with an IWF (IWF of a home location) at a home location, the UE switches from the home location to a visited location, and the IWF of the home location notifies the UE whether the IWF serving the UE is the IWF of the visited location or the IWF of the home location, where the method specifically includes:

the UE accesses the visited place from the home, and due to the change of the location information, the UE performs a procedure of registering update with the IWF-home IWF1 for which it is served.

E1, UE sends a registration update request to the home IWF1, the registration request carries the IMSI of the UE, the current location information (for example: cell information) of the UE, and the PLMN information.

E2, IWF1 determines that the UE is in the visited place according to the current position information or PLMN information of the UE, knows whether the visited place supports CSoEPS or not according to the configuration of an operator, if the visited place does not support CSoEPS, IWF1 determines that the UE continues to serve for the UE and replies a registration update acceptance message to the UE; if CSoEPS is supported by visit, the IWF1 determines that IWF2 (visited IWF) can serve the UE, and sends a registration transfer message to the UE, wherein the message carries the address information (for example: IP address information) of the visited IWF2 and the corresponding indication, and the indication is used for informing the UE that the IWF is the visited IWF.

It should be noted that: the step may also be configured according to an operator, to learn whether to allow establishing an LBO mode bearer for the UE in the visited place, and when the visited place supports csoess and allows establishing an LBO mode bearer for the UE in the visited place, determine that an IWF serving the UE is an IWF2 (IWF of the visited place), and send a registration transfer message to the UE; when the visited place does not support the CSoEPS, or when the visited place supports the CSoEPS but does not allow to establish an LBO mode bearer for the UE at the visited place, the IWF1 replies a registration update acceptance message to the UE, and the IWF1 is an IWF serving the UE;

E3, UE initiates PDN connection request message in visit place again, the message carries APN information and information indicating establishment of LBO mode bearing.

E4, MME selects PDN GW2 of the visited place according to APN, and establishes a special bearer with S-GW/PDN GW 2.

E5, MME sends PDN connection acceptance message to UE.

To this end, the UE establishes an IP tunnel to the IWF 2.

E6, UE sends a registration request to IWF 2.

E7, IWF2 replies to the UE with a registration accept message.

In the sixth embodiment of the present invention, when the UE sends a registration update request to the IWF of the home location, the IWF of the home location finds that the UE is in the visited network, and according to the configuration of the operator, if the visited network supports csoess, the IWF of the home location sends the address of the IWF of the visited location to the UE, the UE knows that the visited network supports csoess, and can select the IWF of the visited location to serve itself. Subsequently, the PDN connection request sent by the UE to the MME carries information indicating establishment of the LBO mode bearer, the bearer established between the MME and the PDN GW of the visited place provides an IP channel for the IWF from the UE to the visited place, and then the UE registers with the IWF of the visited place, so that interruption of subsequent voice communication during handover at the visited place caused by the fact that the registration of the IWF to the visited place is not executed when the CSoEPS is supported at the visited place and the LBO mode bearer is allowed to be established for the UE is avoided.

In the above embodiments of the present invention, in order for the UE to complete the registration with the IWF, the UE first needs to establish an IP channel to the IWF (e.g., the logical interface Z1 shown in fig. 1). This is a precondition, otherwise the registration to the IWF cannot be completed. The embodiment of the invention takes an EPS network as an example, and the establishment of the IP channel from the UE to the IWF is completed by executing the PDN connection establishment process. The invention does not exclude that other ways of establishing a channel to the IWF are used to complete the registration to the IWF. For example, in a UMTS (Universal Mobile telecommunications system) network, a UE initiates a PDP (Packet Data Protocol) session activation to an IP tunnel between IWFs (Serving GPRS Support Node) to an SGSN (Serving GPRS Support Node).

Example seven:

referring to fig. 7, a seventh embodiment of the present invention provides a user equipment, including:

an indication information obtaining unit 701, configured to obtain information indicating whether a visited place supports a circuit domain service to access the csoesps through an evolved packet domain;

a first determining unit 702, configured to determine, according to the information indicating whether the visited place supports csoess, whether an interworking function IWF serving for the UE is an IWF of the visited place or an IWF of the home place;

a processing unit 703, configured to perform service processing by using the determined IWF.

The indication information obtaining unit 701 is a broadcast message receiving unit, and is configured to receive a broadcast message sent by a base station of a visited place, where the broadcast message indicates whether the visited place supports cseps;

alternatively, the instruction information acquisition unit 701 includes: an NAS request message sending unit, configured to send an NAS request message to the MME in the visited place; a NAS accept message receiving unit, configured to receive a NAS accept message sent by the MME, where the NAS accept message carries information indicating whether the visited place supports csoesps.

Alternatively, the instruction information acquisition unit 701 includes: a registration-related message sending unit, configured to send a registration-related message to an IWF of a home location; and the response message receiving unit is used for receiving a response message sent by the IWF of the home location, and determining that the visited place supports CSoEPS if the response message carries the information of the IWF of the visited place.

Specifically, the first determining unit 702 is configured to determine that the IWF serving the UE is an IWF of the visited place when the information indicating whether the visited place supports csoess indicates that the visited place supports csoess; when the information indicating whether the visited place supports the CSoEPS indicates that the visited place does not support the CSoEPS, determining that the IWF serving the UE is the IWF of the home.

The apparatus further comprises: a bearer mode obtaining unit, configured to obtain information indicating whether to allow establishing an LBO mode bearer for the UE in a visited place; optionally, the first determining unit 702 is configured to determine that the IWF serving the UE is the IWF of the visited place when the information indicating whether the visited place supports the csoess indicates that the visited place supports the csoess, and when the information indicating whether the LBO bearer is allowed to be established for the UE at the visited place indicates that the LBO bearer is allowed to be established for the UE at the visited place; when the information indicating whether the visited place supports CSoEPS indicates that the visited place supports CSoEPS and the information indicating whether the LBO mode bearing is allowed to be established for the UE at the visited place indicates that the LBO mode bearing is not allowed to be established for the UE at the visited place, determining that the IWF serving the UE is the IWF of the home place; when the information indicating whether the visited place supports the CSoEPS indicates that the visited place does not support the CSoEPS, determining that the IWF serving the UE is the IWF of the home.

Wherein, if the first determining unit 702 determines that the IWF served by the UE is the IWF of the visited place, the processing unit 703 is configured to send a registration request to the IWF of the visited place;

or,

when the UE is attached at a visited place and the first determining unit 702 determines that the IWF serving the UE is the IWF of the home, the processing unit 703 is configured to send a registration request to the IWF of the home.

The user equipment further comprises: a connection request sending unit, configured to send, to an MME in a visited place, a PDN connection request carrying an indication to establish a local trigger LBO bearer when the first determining unit 702 determines that the IWF serving the UE is the IWF in the visited place; when the first determining unit 702 determines that the IWF serving the UE is the IWF of the home location, a PDN connection request carrying an instruction to establish a home routing HRO mode bearer is sent to the MME of the visited location.

In the seventh embodiment of the present invention, the UE acquires the information indicating whether the visited place supports csoesps, to know whether the visited place supports csoesps, and determines whether to register with the IWF of the visited place or with the IWF of the home location according to whether the visited place supports csoesps, so as to avoid the waste of network resources and the delay of service development caused by executing a relevant procedure of registering to the IWF of the visited place when the visited place does not support csoesps, and avoid the interruption of voice communication caused by subsequent switching at the visited place when the visited place does not support the IWF of the visited place.

Example eight:

referring to fig. 8, an eighth embodiment of the present invention provides a mobility management network element, including:

a message receiving unit 801, configured to receive a PDN connection request message sent by a UE;

a second determining unit 802, configured to determine, after receiving the PDN connection request message sent by the UE, whether an IWF serving the UE is a visited IWF or a home IWF;

a message sending unit 803, configured to send a PDN connection acceptance message to the UE, where the PDN connection acceptance message includes the determined IWF information for providing services for the UE, so that the UE performs service processing using the determined IWF.

Wherein, the second determining unit 802 is configured to determine, when the visited support supports csoess, that the IWF serving the UE is a visited IWF; and when the visiting place does not support CSoEPS, determining that the IWF serving the UE is the IWF of the home place.

Optionally, the second determining unit 802 is configured to determine that an IWF serving for the UE is an IWF of a visited place when the UE supports csoess in a visited place and allows an LBO bearer to be established for the UE in the visited place; when the visited place does not support CSoEPS, or the visited place supports CSoEPS and does not allow to establish LBO mode bearing for the UE at the visited place, determining that the IWF serving the UE is the IWF of the home place.

The mobility management network element in the eighth embodiment of the invention determines whether to establish a channel to the IWF of the visited place or a channel to the IWF of the home place for the UE according to whether the visited place supports CSoEPS, thereby avoiding the waste of network resources caused by that the UE requests to establish an IP channel to the IWF of the visited place when the visited place does not support CSoEPS; meanwhile, the interruption of voice communication caused by the fact that the UE does not request to establish an IP channel to the IWF of the visited place when the CSoEPS is supported by the visited place and the registration of the IWF of the visited place cannot be completed is avoided.

It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware that is instructed to implement by a program, and the program may be stored in a computer-readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like.

The service processing method and the related device provided by the embodiment of the present invention are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for processing a service, comprising:

2. The method of claim 1,

the information indicating whether the visited place supports cseps is specifically acquired as follows:

the method comprises the steps that UE receives a broadcast message sent by a base station of a visited place, wherein the broadcast message is used for indicating whether the visited place supports CSoEPS or not;

or,

UE sends a non-access stratum NAS request message to a mobility management entity MME of a visited place;

receiving an NAS receiving message sent by the MME, wherein the NAS receiving message comprises information indicating whether the visited place supports CSoEPS;

or,

UE sends request message to IWF of home location;

and receiving a response message sent by the IWF of the home location, and determining that the visited place supports CSoEPS if the response message carries the information of the IWF of the visited place.

3. The method of claim 2,

the determining whether the interworking function IWF serving the UE is the IWF of the visited place or the IWF of the home place is specifically:

when the information indicating whether the visited place supports CSoEPS indicates that the visited place supports CSoEPS, determining that the IWF serving the UE is the IWF of the visited place;

or,

when the information indicating whether the visited place supports the CSoEPS indicates that the visited place does not support the CSoEPS, determining that the IWF serving the UE is the IWF of the home.

4. The method of claim 2,

before determining whether an interworking function (IWF) serving the UE is an IWF of a visited place or an IWF of a home place, the method further comprises:

acquiring information indicating whether to allow a local trigger LBO mode bearer to be established for the UE in a visited place;

said step of determining whether an interworking function IWF serving said UE is an IWF of a visited place or an IWF of a home place comprises:

when the information indicating whether the visited place supports CSoEPS indicates that the visited place supports CSoEPS and the information indicating whether the indication allows the LBO mode bearer to be established for the UE at the visited place indicates that the LBO mode bearer to be established for the UE at the visited place, determining that the IWF serving the UE is the IWF of the visited place;

or,

when the information indicating whether the visited place supports CSoEPS indicates that the visited place supports CSoEPS and the information indicating whether the LBO mode bearing is allowed to be established for the UE at the visited place indicates that the LBO mode bearing is not allowed to be established for the UE at the visited place, determining that the IWF serving the UE is the IWF of the home place;

or,

5. The method according to claim 3 or 4,

after determining that the IWF serving the UE is the IWF of the visited place, before performing service processing using the determined IWF, the method further includes:

and sending a request carrying an instruction for establishing the LBO mode bearer to the MME of the visited place.

6. The method according to claim 3 or 4,

after determining that the IWF serving the UE is the IWF of the home location, before performing service processing using the determined IWF, the method further includes:

and sending a request carrying an instruction for establishing a home routing HRO mode bearer to the MME of the visited place.

7. The method according to any one of claims 1 to 4,

if the UE is attached to the visited place, the service processing by adopting the determined IWF comprises the following steps:

if the IWF serving the UE is determined to be the IWF of the visited place, sending a registration request to the IWF of the visited place; and if the IWF serving the UE is determined to be the IWF of the attribution, sending a registration request to the IWF of the attribution.

8. The method according to any one of claims 1 to 4,

if the UE is switched from the home location to the visit location, the service processing by adopting the determined IWF comprises the following steps:

if the IWF serving the UE is determined to be the IWF of the visited place, sending a registration request to the IWF of the visited place; maintaining the registration of the IWF at the home location if it is determined that the IWF serving the UE is the IWF of the home location.

9. A method for processing a service, the method comprising:

receiving a Packet Data Network (PDN) connection request message sent by UE;

10. The method of claim 9,

the determining whether the IWF serving the UE is the visited IWF or the home IWF specifically includes:

when the visited support supports CSoEPS, determining that the IWF serving the UE is the IWF of the visited place;

and when the visiting place does not support CSoEPS, determining that the IWF serving the UE is the IWF of the home place.

11. The method of claim 9,

when the visited support supports CSoEPS and the LBO mode bearer is allowed to be established for the UE at the visited place, determining that the IWF serving the UE is the IWF of the visited place;

when the visited place does not support CSoEPS, or the visited place supports CSoEPS and does not allow to establish LBO mode bearing for the UE at the visited place, determining that the IWF serving the UE is the IWF of the home place.

12. The method of claim 9, 10 or 11,

prior to determining whether an IWF serving the UE is a visited IWF or a home IWF, the method further comprises:

and determining that the APN carried in the PDN connection request message is the APN for identifying and establishing the voice service bearer.

13. A user device, comprising:

14. The apparatus of claim 13,

the indication information acquisition unit is a broadcast message receiving unit and is used for receiving a broadcast message sent by a base station of a visited place, and the broadcast message indicates whether the visited place supports CSoEPS or not;

or,

the indication information acquisition unit includes:

an NAS request message sending unit, configured to send an NAS request message to the MME in the visited place;

an NAS accept message receiving unit, configured to receive an NAS accept message sent by the MME, where the NAS accept message includes information indicating whether the visited place supports csoesps;

or,

the indication information acquisition unit includes:

a register related message sending unit, which is used for sending a request message to the IWF of the home location;

and the response message receiving unit is used for receiving a response message sent by the IWF of the home location, and determining that the visited place supports CSoEPS if the response message carries the information of the IWF of the visited place.

15. The apparatus of claim 14,

the first determining unit is configured to determine that the IWF serving the UE is an IWF of a visited place when the information indicating whether the visited place supports csoess indicates that the visited place supports csoess; when the information indicating whether the visited place supports the CSoEPS indicates that the visited place does not support the CSoEPS, determining that the IWF serving the UE is the IWF of the home.

16. The apparatus of claim 14,

the apparatus further comprises: a bearer mode obtaining unit, configured to obtain information indicating whether to allow a local trigger LBO mode bearer to be established for the UE in a visited place;

when the information indicating whether the visited place supports CSoEPS indicates that the visited place supports CSoEPS and the information indicating whether LBO mode bearing is allowed to be established for the UE at the visited place indicates that the LBO mode bearing is allowed to be established for the UE at the visited place, the first determining unit determines that the IWF serving for the UE is the IWF of the visited place; when the information indicating whether the visited place supports CSoEPS indicates that the visited place supports CSoEPS and the information indicating whether the UE is allowed to establish LBO mode bearing at the visited place indicates that the UE is not allowed to establish LBO mode bearing at the visited place, the first determining unit determines that the IWF serving the UE is the IWF of the home; when the information indicating whether the visited place supports CSoEPS indicates that the visited place does not support CSoEPS, the first determining unit determines that the IWF serving the UE is the IWF of the home place.

17. The apparatus according to claim 15 or 16, characterized in that the apparatus further comprises:

a connection request sending unit, configured to send a PDN connection request carrying an indication to establish an LBO bearer to an MME in a visited place when the first determining unit determines that the IWF serving the UE is the IWF in the visited place; or when the IWF serving the UE is determined to be the IWF of the home location, sending a PDN connection request carrying an instruction for establishing the home routing HRO mode to the MME of the visited location.

18. The apparatus of claim 13, 14, 15 or 16,

if the first determining unit determines that the IWF serving the UE is the IWF of the visited place, the processing unit is configured to send a registration request to the IWF of the visited place;

or,

when the UE is attached at a visit place and the first determination unit determines that the IWF serving the UE is the IWF of the home place, the processing unit is used for sending a registration request to the IWF of the home place.

19. A mobility management network element, comprising:

20. The network element of claim 19,

the second determining unit is used for determining that the IWF serving the UE is the IWF of the visited place when the CSoEPS is supported by the visited place; and when the visiting place does not support CSoEPS, determining that the IWF serving the UE is the IWF of the home place.

21. The network element of claim 19,

the second determining unit is used for determining that the IWF serving the UE is the IWF of the visited place when the CSoEPS is supported by the visited place and the LBO mode bearer is allowed to be established for the UE at the visited place; when the visited place does not support CSoEPS, or the visited place supports CSoEPS and does not allow to establish a local trigger LBO mode bearer for the UE at the visited place, determining that the IWF serving the UE is the IWF of the home place.