CN111918412A

CN111918412A - Communication system, service processing method and device

Info

Publication number: CN111918412A
Application number: CN201910388384.1A
Authority: CN
Inventors: 张增涛; 马圆圆; 楚彬
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-11-10
Anticipated expiration: 2039-05-10
Also published as: CN111918412B

Abstract

The invention discloses a communication system, a service processing method and a device, wherein the system comprises: the system comprises an Internet protocol multimedia subsystem (IMS) and at least one Evolved Packet Core (EPC) communicated with the IMS; the network segments of the IP addresses of any two EPCs in the plurality of EPCs are different; any EPC in the EPCs is used for allocating an IP address to the UE attached under the EPC, and the IP address of the UE is the same as the network segment of the IP address of the EPC.

Description

Communication system, service processing method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a communication system, a service processing method, and an apparatus.

Background

In a Voice over Long Term Evolution (VoLTE) network, when User Equipment (UE) performs Voice communication, if one party is in an idle state and the other party initiates a Voice call to the idle user equipment, an IP Multimedia Subsystem (IMS) communicates a received Voice call request with each network element in an Evolved Packet Core (EPC) through a Policy Control and Charging Rules Function (PCRF). The action of completing the voice call by the EPC network.

At present, VOLTE high-definition communication formed by IMS and EPC basically has the characteristics of closed space and discrete distribution of working areas in use scenes. In an enterprise with many working areas, it may be necessary to deploy a network element of EPC in each working area for UE access.

Due to the fact that the IMS system is complex, the EPCs are distributed discretely, the deployment of the IMS system and the networking of the EPCs involves multiple network elements and interfaces, the network resource reservation process is more complex, and network risks are increased.

Disclosure of Invention

The embodiment of the invention provides a communication system, a service processing method and a service processing device, which are used for solving the dependence of each working area in VOLTE (voice over long term evolution) communication service and the complexity in a network resource reservation process and avoiding the networking dependence among multiple sets of EPCs (evolved packet cores).

The embodiment of the invention provides a communication system, which comprises an Internet protocol multimedia subsystem IMS and at least one Evolved Packet Core (EPC) communicated with the IMS;

the network segments of the IP addresses of any two EPCs in the plurality of EPCs are different;

any EPC in the EPCs is used for allocating an IP address to the UE attached under the EPC, and the IP address of the UE is the same as the network segment of the IP address of the EPC.

The embodiment of the invention provides a service processing method, a device and a communication system, wherein the system comprises an Internet protocol multimedia subsystem (IMS) and at least one Evolved Packet Core (EPC) communicated with the IMS; the VOLTE call method for networking one IMS and a plurality of EPCs is realized. The network segments of the IP addresses of any two EPCs in the plurality of EPCs are different; any EPC in the EPCs is used for distributing an IP address for the UE attached to the EPC, the IP address of the UE is the same as the network segment of the IP address of the EPC, the corresponding EPC selected by the IMS in the VOLTE call can be reserved for network resources, and because the network segments of the IP addresses of any two EPCs in the EPCs are different, networking dependency among multiple sets of EPCs is avoided, and complexity in a network resource reservation process is reduced.

In one possible implementation, any one of the EPCs is provided with a corresponding public data network GateWay (PDN GateWay, P-GW).

In one possible implementation, the network connection is established between the EPCs through a routing device.

Network connection is established through the routing equipment, so that network intercommunication can be realized among EPCs, the establishment of a link is directly initiated among EPCs, and networking dependency is reduced.

The embodiment of the invention provides a service processing method, which comprises the following steps:

the IMS determines the IP address of the first UE;

the IMS determines a first EPC attached to the first UE according to the IP address of the first UE; the first UE is the same as a network segment of the first EPC; the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS;

the IMS sends a request to establish a bearer to the first EPC.

The first EPC can be directly determined by attaching the IP address of the first EPC through the first UE, so that the second EPC can initiate a bearer establishment request to the first EPC, and networking dependency among multiple sets of EPCs is avoided.

One possible implementation manner, where the IMS determines an IP address of the first UE, includes:

the IMS determines the IP address of the first UE based on a Session Description Protocol (SDP) negotiation response fed back by the first UE;

the IMS sends a bearer establishment request to the first EPC, and the bearer establishment request comprises the following steps:

the IMS sends an Authentication and Authorization Request (AAR) message to the first EPC for media resource reservation, so that the first UE establishes a called bearer with the first EPC.

receiving an attach request of a first UE by a first EPC;

the first EPC allocates an IP address for the first UE, the IP address of the first UE is the same as the IP address of the first EPC in network segment, and the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS.

In one possible implementation, the method further includes:

the first EPC obtains a bearer establishment request sent by the IMS; the bearer establishment request is sent by the IMS to a first EPC to which the first UE is attached according to the IP address of the first UE.

A possible implementation manner, where the request for establishing a bearer includes: an AAR message, configured to reserve media resources, so that the first UE establishes a called bearer with the first EPC; the bearer establishment request is sent by the IMS to the first EPC after the first UE sends a Session Description Protocol (SDP) negotiation response to the IMS; the SDP negotiation response is used by the IMS to determine an IP address of the first UE.

An embodiment of the present invention provides a service processing apparatus, where the apparatus includes:

a processing unit for determining an IP address of a first UE; determining a first EPC attached by the first UE according to the IP address of the first UE; the first UE is the same as a network segment of the first EPC; the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS;

a transceiving unit, configured to send a bearer establishment request to the first EPC.

a transceiving unit, configured to receive an attach request of a first UE;

a processing unit, configured to allocate an IP address to the first UE, where the IP address of the first UE is the same as a network segment of the IP address of the first EPC, and the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS.

An embodiment of the present invention provides a network element, including:

a processor;

a memory; and a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor, the computer program comprising instructions for performing the method of any of the above embodiments.

Embodiments of the present invention provide a computer-readable storage medium storing computer instructions, which when executed by a processor implement a method as in any one of the above embodiments.

Drawings

Fig. 1a is a schematic diagram of a communication system according to an embodiment of the present invention;

fig. 1b is a schematic flow chart of a service processing method according to an embodiment of the present invention;

fig. 2a is a schematic diagram of a communication system according to an embodiment of the present invention;

fig. 2b is a schematic flow chart of a service processing method according to an embodiment of the present invention;

fig. 3a is a schematic diagram of a communication system according to an embodiment of the present invention;

fig. 3b is a schematic flow chart of a service processing method according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a service processing apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a service processing apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a network element according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a network element according to an embodiment of the present invention.

Detailed Description

The technical scheme provided by the embodiment of the application can be applied to various systems. For example, the applicable system may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) system, a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a universal microwave Access (WiMAX) system, a 5G NR system, and the like. These various systems include terminal devices and network devices.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. The names of the terminal devices may also be different in different systems, for example, in a 5G system, the terminal devices may be referred to as User Equipments (UEs). Wireless terminal devices, which may be mobile terminal devices such as mobile telephones (or "cellular" telephones) and computers with mobile terminal devices, e.g., mobile devices that may be portable, pocket, hand-held, computer-included, or vehicle-mounted, communicate with one or more core networks via the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to interconvert received air frames with Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) or a Code Division Multiple Access (CDMA), may also be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may also be an evolved network device (eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station in a 5G network architecture (next generation system), and may also be a home evolved node B (HeNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like, which are not limited in the embodiments of the present application.

To provide VOLTE calls, there is an establish media bearer interface Rx (media resource reservation uses AAR/AAA messages of the Rx interface) between IMS and EPC. IMS configures EPC address to establish Rx link, and transmits AAR and AAA command on Rx link.

Taking the LTE system as an example, as shown in fig. 1a, an embodiment of the present invention provides a network architecture in a one-to-one form of IMS and EPC, including an internet protocol multimedia subsystem IMS, and an evolved packet core EPC communicating with the IMS.

The EPC Network includes main Network element entities such as a Packet Data Network Gateway (Packet Data Gateway, P-GW), a Serving Gateway (SGW), a Mobility Management Entity (MME), a Home Subscriber Server (HSS), and a PRCF.

In a mobile communication wireless Network in LTE, an Access Network part is an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). The E-UTRAN consists of a plurality of enodebs (Evolved nodebs), which are interconnected with each other through an X2 interface, with the enodebs and the EPC through an S1 interface, and with the UEs through LTE-Uu.

For a network architecture in a form of one-to-one IMS and EPC, as shown in fig. 1b, an embodiment of the present invention provides a service processing method, including:

step 101, a calling UE initiates a session request to a called UE to an IMS system;

the called UE A is in an idle state, the session request can be an SDP negotiation, and the SDP negotiation carries media coding and decoding information supported by the calling UE and IP port information of the calling UE; the IP port information may be an IP address and a port used by the calling UE for receiving the media stream. When the IP port information of the UE is that the UE is attached to the EPC, the EPC is allocated to the UE.

102, an IMS system receives a session request sent by calling UE and forwards the session request to called UE;

specifically, the IMS forwards the received SDP negotiation information initiated by the calling UE to the called UE.

103, the called UE returns a session response to the IMS;

specifically, the called UE performs media codec negotiation with the calling UE according to the session request, and returns a negotiation result and IP port information of the called UE to the IMS through a session response.

Step 104, the IMS sends a request for establishing a called bearer to the EPC network, and triggers a procedure for creating a dedicated bearer, which is used for carrying a voice service between the calling UE and the called UE.

Specifically, the IMS initiates an AAR message to the EPC for establishing a media bearer on the called side;

step 105, EPC returns a called bearer establishment response to IMS;

specifically, the bearer establishment response may be an AAA command, and is used to establish a media bearer with the called side.

In the specific implementation process, the UE is called by the EPC network through the communication between the PCRF and the EPC network element. PCRF forwards the received voice call request to P-GW, when receiving the voice call request, P-GW sends voice call trigger message to SGW, when SGW receives the voice call trigger message, according to the indication of IMS in the voice call trigger message, the SGW triggers a bearer establishment request for bearing voice service to MME.

Step 106, the IMS sends the session response to the calling UE;

specifically, the session response includes media codec information negotiated by the calling UE and the called UE.

Step 107, the IMS initiates a request for establishing a calling bearer to the EPC;

specifically, the bearer establishment request may be an AAR message, which is used to establish a media bearer at a calling side;

step 108, EPC returns the response of establishing calling bearing to IMS;

specifically, the bearer establishment response may be an AAA command, configured to establish a media bearer with the calling side;

at this point, the media bearer establishment is completed, and the media stream between the calling UE and the called UE can be forwarded through the EPC.

Due to the needs of application scenarios, a network architecture in a one-to-one form of IMS and EPC cannot meet network requirements, and the network architecture needs to deploy multiple sets of EPCs, for example, because working areas are relatively discrete, in order to ensure network performance, one set of EPC needs to be deployed in each working area, that is, one IMS and multiple sets of EPCs are networked.

Based on this, as shown in fig. 2a, an embodiment of the present invention provides a communication system, including an IMS, at least one EPC communicating with the IMS; e.g., EPC1 and EPC 2; wherein the EPC1 is provided with a P-GW. The EPC1 is used to allocate IP port information for UEs attached under the at least one EPC, where the IP port information may be an IP address and a port number used for transporting media streams. That is, EPC1 allocates IP port information to UEs in EPC1 and EPC 2. For example, UE1 accesses EPC1 through E-UTRAN1, EPC1 allocates IP port information for UE 1; UE2 accesses EPC2 through E-UTRAN2, EPC2 communicates with EPC1 such that EPC1 allocates IP port information for UE 1. One possible implementation, Rx link establishment between IMS and EPC1, may take the form of fixed address configuration.

As shown in fig. 2b, an embodiment of the present invention provides a service processing method for the above network architecture, including:

step 201: UE1 initiates a session request to IMS;

specifically, the session request may be an SDP negotiation, and the SDP negotiation carries media codec information supported by the UE1 and IP port information of the UE 1. The IP port information of the UE1 may be an IP address and a port number used by the UE1 for transmitting the media stream.

Step 202: the IMS forwards the session request to the UE 2;

specifically, the IMS forwards the SDP negotiation information received from the UE1 to the UE2 through the EPC 2;

step 203: the UE2 sends a session response to the IMS;

the session response includes the negotiation result of the media codec negotiation performed by the UE2 and the UE1 and the IP port information of the UE 2. The IP port information of the UE2 may be an IP address and a port number used by the UE2 for transmitting the media stream.

Step 204: IMS initiates a request for establishing called bearing to EPC1, and is used for establishing the reservation of media resources of the called side;

step 205: EPC1 forwards the called bearer request to EPC2 according to the called bearer request;

step 206: EPC2 returns a called bearer response to EPC1, where the called bearer response is used to determine media resource reservation of UE 2;

step 207: EPC1 sends the called bearer response to IMS;

step 208: the IMS forwards the session response received to the UE2 to the UE1 through the EPC1, for sending the IP port information of the UE 2;

specifically, the IMS replaces the address of the SDP negotiation information of the session response received from the EPC2 with the address of the EPC1 to the intranet, so as to forward the session response to the EPC 1;

step 209: the IMS initiates a request for establishing a calling bearer to the EPC1, and is used for establishing the reservation of media resources on the calling side;

step 210: EPC1 determines the reservation of media resource of UE1 and sends the calling bearer response to IMS;

so far, after the bearer between the UE1 and the UE2 is established, the media stream may be forwarded through the EPC1 and the EPC 2;

this approach increases the dependency and networking complexity between EPCs. When the first EPC fails, other EPCs and IMS cannot independently perform VOLTE call service, which is not beneficial to reducing network risk.

In order to further reduce networking dependency among a plurality of EPCs and reduce service dependency among EPCs, the embodiment of the invention provides a communication system, which comprises an IMS and at least one EPC communicated with the IMS; the network segments of the IP addresses of any two EPCs in the EPCs are different; any EPC in the EPCs is used for allocating IP port information to the UE attached under the EPC, and the IP address of the UE is the same as the network segment of the IP address of the EPC.

For example, as shown in fig. 3a, the EPCs include a first EPC, a second EPC; the network segments of the IP addresses of the first EPC and the second EPC are different; the first EPC is used for allocating IP port information to a first UE attached under the first EPC; the IP port information may include, among other things, an IP address and a port number for the media stream. The IP address of the first UE is the same as the network segment of the IP address of the first EPC; the second EPC is used for allocating IP port information to a second UE attached under the second EPC; the IP address of the second UE is the same as the network segment of the IP address of the second EPC.

In the embodiment of the application, a solution for networking one IMS and a plurality of EPCs is provided, and the IMS can select the corresponding EPCs to reserve media resources under the standard VOLTE call flow. The method can realize no dependence between EPCs and simple networking, and each EPC can independently carry out networking work with an IMS. Because the network segments of the IP addresses of any two EPCs in the plurality of EPCs are different; when the IMS sends the AAR message, the AAR message can be directly sent to the corresponding EPC without being sent to the first EPC, network resources of other EPCs are reserved by the first EPC, and service dependence among the EPCs is effectively reduced. When the first EPC fails, other EPCs and the IMS can also independently carry out VOLTE call service, and network risks are effectively reduced.

Based on the network architecture, in one possible implementation manner, any one of the EPCs is provided with a corresponding P-GW.

Based on the network architecture, an embodiment of the present invention provides a service processing method, including:

step one, a first EPC receives an attachment request of a first UE;

step two, a first EPC allocates IP port information for the first UE, the IP address of the first UE is the same as the network segment of the IP address of the first EPC, and the network segments of the first EPC and a second EPC are different; the second EPC is another EPC in communication with the IMS.

According to the network architecture, as shown in fig. 3b, an embodiment of the present invention provides a service processing method, including:

step 301: the second UE sends a session request to the IMS;

specifically, the second UE may send a session request to the IMS through the second EPC; the session request may be an SDP negotiation; the SDP negotiation carries media coding and decoding information supported by the first UE and IP port information of the first UE. The IP port information of the first UE may be an IP address and a port number used by the first UE for transmitting the media stream.

Step 302: the IMS determines the IP address of the first UE;

in the specific implementation process, the method comprises the following steps:

the IMS determines the IP port information of the first UE based on the SDP negotiation response returned by the second UE;

step 303: the IMS determines a first EPC attached to the first UE according to the IP port information of the first UE;

specifically, the IMS may determine, according to the IP address of the first UE, a network segment of the IP address of the first EPC;

step 304: the IMS sends a request for establishing the bearer to the first EPC.

The bearer establishment request may be a bearer establishment request for establishing a called bearer;

in a specific implementation process, the IMS sends an AAR message to the first EPC for media resource reservation, so that the first UE establishes a called bearer with the first EPC.

Step 305: and the first EPC performs media resource reservation for the first UE according to the bearer establishment request sent by the IMS.

The following describes a procedure of initiating a call to the IMS by the UE specifically, including:

step one, the second UE initiates SDP negotiation, the SDP negotiation carries the media coding and decoding information supported by the second UE and the IP port information of the second UE.

Step two, the IMS forwards the received SDP negotiation information initiated by the second UE to the first UE.

And step three, the first UE carries out media coding and decoding negotiation with the second UE and returns a negotiation result and IP port information of the first UE to the IMS.

Step four, the IMS determines a first EPC according to the IP port information of the first UE;

step five, the IMS sends an AAR message to the first EPC for reserving media resources for the first UE;

step six, the IMS sends the media coding and decoding information negotiated by the first UE and the second UE to the second UE.

Step seven, the IMS determines a second EPC according to the IP port information of the second UE;

step eight, the IMS sends an instruction to the second EPC for sending an AAR message to the second UE for reserving the media resources;

and when the bearer establishment between the first UE and the second UE is finished, the media stream is forwarded through the first EPC and the second EPC.

In the VOLTE call, the IMS sends a bearer establishment request to the corresponding EPC according to the IP address of the UE so that the corresponding EPC can reserve resources for the UE, thereby not only ensuring the compatibility with the standard EPC, but also reducing the networking complexity, reducing the complexity of resource reservation, removing the dependence between the EPCs and meeting the requirement that any EPC and IMS operate independently.

Based on the same inventive concept, as shown in fig. 4, an embodiment of the present invention provides a service processing apparatus, where the apparatus includes:

a processing unit 401, configured to determine an IP address of a first UE; determining a first EPC attached by the first UE according to the IP address of the first UE; the first UE is the same as a network segment of the first EPC; the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS;

a transceiving unit 402, configured to send a bearer establishment request to the first EPC.

In a possible implementation manner, the processing unit 401 is specifically configured to: determining an IP address of the first UE based on a Session Description Protocol (SDP) negotiation response fed back by the first UE;

the transceiving unit 402 is specifically configured to: sending an AAR message to the first EPC for media resource reservation, so that the first UE establishes a called bearer with the first EPC.

Based on the same inventive concept, as shown in fig. 5, an embodiment of the present invention provides a service processing apparatus, where the apparatus includes:

a transceiving unit 501, configured to receive an attach request of a first UE;

a processing unit 502, configured to allocate an IP address to the first UE, where the IP address of the first UE is the same as a network segment of the IP address of the first EPC, and the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS.

In a possible implementation manner, the transceiving unit 402 is specifically configured to: acquiring a bearer establishment request sent by the IMS; the bearer establishment request is sent by the IMS to a first EPC to which the first UE is attached according to the IP address of the first UE.

A possible implementation manner, where the request for establishing a bearer includes: an AAR message, configured to reserve media resources, so that the first UE establishes a called bearer with the first EPC; the bearer establishment request is sent by the IMS to the first EPC after the first UE feeds back a Session Description Protocol (SDP) negotiation response to the IMS; the SDP negotiation response is used by the IMS to determine an IP address of the first UE.

Based on the same inventive concept, as shown in fig. 6, an embodiment of the present invention provides a network element, where the network element includes: a processor 601; a memory 602; a transceiver 603; and a computer program; wherein the computer program is stored in the memory and configured to be executed by the processor 601 to:

determining an IP address of a first UE; determining a first EPC attached by the first UE according to the IP address of the first UE; the first UE is the same as a network segment of the first EPC; the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS;

a transceiver 603 configured to send a request to establish a bearer to the first EPC.

In one possible implementation, the processor 601 is specifically configured to: determining an IP address of the first UE based on a Session Description Protocol (SDP) negotiation response fed back by the first UE;

the transceiver 603 is specifically configured to: sending an AAR message to the first EPC for media resource reservation, so that the first UE establishes a called bearer with the first EPC.

Where in fig. 6 the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors represented by the processor 601 and various circuits of the memory represented by the memory 602, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 603 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 601 is responsible for managing the bus architecture and general processing, and the memory 602 may store data used by the processor 601 in performing operations.

Based on the same inventive concept, as shown in fig. 7, an embodiment of the present invention provides a network element, where the network element includes: a processor 701; a memory 702; a transceiver 703; and a computer program; wherein the computer program is stored in the memory and configured to be executed by the processor 701 to:

allocating an IP address for the first UE, wherein the IP address of the first UE is the same as the IP address of the first EPC in network segment, and the network segments of the first EPC and the second EPC are different; the second EPC is another EPC in communication with the IMS.

A transceiver 701 configured to receive an attach request of a first UE.

In one possible implementation, the transceiver 703 is specifically configured to: acquiring a bearer establishment request sent by the IMS; the bearer establishment request is sent by the IMS to a first EPC to which the first UE is attached according to the IP address of the first UE.

Wherein in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 701, and various circuits, represented by memory 702, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 703 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 701 in performing operations.

When user equipment carries out VOLTE call through different EPC network elements, when IMS initiates reservation of media resources of called user equipment, SDP negotiation information IP port information in an SDP negotiation result initiated by the called user equipment needs to be converted into pre-configured intranet IP port information of EPC to realize called bearing so as to obtain the called bearing;

in order to realize high-quality voice, video and data services EPC, the EPC is basically deployed in each working area, so that the links of network nodes are reduced, and the performances of conversation and data services are improved.

The processor 1102 is responsible for managing the bus architecture and general processing, and the memory 1101 may store data used by the processor 1102 in performing operations.

The processor 1102 in this embodiment of the Application may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD).

It should be noted that any memory mentioned in the embodiments of the present application may include a Read Only Memory (ROM) and a Random Access Memory (RAM), and provide the processor with program instructions and data stored in the memory. In the embodiments of the present application, the memory may be used for storing a program of any one of the methods provided by the embodiments of the present application. The processor is used for executing any method provided by the embodiment of the application according to the obtained program instructions by calling the program instructions stored in the memory.

Based on the same concept, embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to enable a computer to execute any one of the foregoing handover methods.

The computer-readable storage medium can be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

The above method process flow may be implemented by a software program, which may be stored in a storage medium, and when the stored software program is called, the above method steps are performed.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

Claims

1. A communication system comprising an internet protocol multimedia subsystem, IMS, at least one evolved packet core, EPC, in communication with said IMS;

any two EPCs in the plurality of EPCs have different network segments of the Internet protocol IP addresses;

any EPC in the EPCs is used for allocating an IP address to User Equipment (UE) attached under the EPC, and the IP address of the UE is the same as the network segment of the IP address of the EPC.

2. The system of claim 1, wherein any one of the plurality of EPCs is provided with a corresponding public data network gateway (P-GW).

3. The system of claim 1, wherein the network connections between the plurality of EPCs are established via a routing device.

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

the IMS determines the IP address of the first UE;

the IMS sends a request to establish a bearer to the first EPC.

5. The method of claim 4, wherein the IMS determines an IP address of the first UE, comprising:

and the IMS sends an Authentication Authorization Request (AAR) message to the first EPC for reserving media resources so that the first UE establishes a called bearer with the first EPC.

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

receiving an attach request of a first UE by a first EPC;

7. The method of claim 6, further comprising:

8. The method of claim 7, wherein the request to establish the bearer comprises: an AAR message, configured to reserve media resources, so that the first UE establishes a called bearer with the first EPC; the bearer establishment request is sent by the IMS to the first EPC after the first UE feeds back a Session Description Protocol (SDP) negotiation response to the IMS; the SDP negotiation response is used by the IMS to determine an IP address of the first UE.

9. A traffic processing apparatus, characterized in that the apparatus comprises:

10. A traffic processing apparatus, characterized in that the apparatus comprises:

a transceiving unit, configured to receive an attach request of a first UE;

11. A network element, comprising:

a processor;

a memory; and a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor, the computer program comprising instructions for performing the method of any of claims 4 to 5 or any of the methods of 6-8.

12. A computer-readable storage medium storing computer instructions which, when executed by a processor, implement the method of any one of claims 4 to 8.