WO2009026841A1

WO2009026841A1 - A system, apparatus and method for providing service to the user device

Info

Publication number: WO2009026841A1
Application number: PCT/CN2008/072108
Authority: WO
Inventors: Geng Wang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-08-23
Filing date: 2008-08-22
Publication date: 2009-03-05
Also published as: CN101374335A; CN101374335B

Abstract

A system, apparatus and method for providing service to a user device are provided, the said system includes a group access network, a mobile switching center of a circuit domain, a user device accessing wireless communication network through the group access network, and also includes a group access unit, which provides a signal channel between the group access network and the mobile switching center of the circuit domain and manages the media channel between the user device and the mobile switching center according to the requirement of the user device to establish the needed service; the user device performs a signal interaction for establishing service with the mobile switching center by the said signal channel through the group access network. Using the above system, apparatus and method, the user device covered by the group network can obtain service from the mobile switching center of the core network of the circuit domain through the group access network.

Description

System, device and method for providing service for user equipment. The present application claims to be submitted to the Chinese Patent Office on August 23, 2007, the application number is 200710145143.1, and the invention name is "a system, device and method for providing services for user equipment". The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of wireless communications, and in particular, to a system, apparatus, and method for providing services for user equipment. Background technique

There are many types of wireless networks available today, including GSM/WCDMA (Global System for Mobile Communications/Wireless Code Division Multiple Access), CDMA 2000 (Code Division Multiple Access 2000, code division). Multiple Access 2000) and TD-SCDMA (Time Division-Synchronous Code Division Multiple Access). Both can provide mobile services for users. They have similarities in architecture and business capabilities. Let's take WCDMA as an example to describe the architecture of wireless networks. FIG. 1 is a schematic diagram of a WCDMA network architecture in 3GPP TS23.002 V640. As shown in the figure, related entities in the architecture involving the present invention are:

MSC server (Mobile Switching Center server) and CS-MGW (Circuit Switch Media Gateway) in the CN (Core Network), which belong to the circuit domain core network; and SGSN (Serving) GPRS Support Node, Service GPRS Support Node; GPRS refers to General Packet Radio Service, General Packet Radio Service, and GGSN (Gateway GPRS Support Node), which belong to the packet domain core network.

The BSS (Base Station Subsystem) and the RNS (Radio Network Subsystem) belonging to the AN (Access Network) are shared by the circuit domain and the packet domain core network.

Among them, the core network plays a role of business control, which is used to check the signing of services and provide business logic. The access network provides access capabilities for users and provides basic signaling and media for users to obtain services. The transmission channel is the basis for the user to obtain the service.

In the circuit domain call service process, the UE (User Equipment) needs to make a call under the control of the MSC through the circuit domain access mode, and the circuit access network needs to provide a signaling channel (message transmission channel) and a bearer for the call. Channel, and provides routing functions for signaling messages.

SAE (System Architecture Evolution) is a packet network architecture. The main entities are MME (Mobility Management Entity), PDN GW (Packed Data Network Gateway), Packet Data Network Gateway M. PCRF (Policy Control) And Charging Rules Function, policy control and charging rules function, etc. SAE has roaming architecture and non-roaming architecture. SAE provides users with a relatively efficient packet transmission network, which can be used to provide users with VoIP (voice over IP, IP-based voice call) service.

The following uses a non-roaming architecture as an example to illustrate the network configuration of SAE. 2 is a schematic diagram of a non-roaming SAE architecture. As shown in the figure, the functions of the MME related to the present invention mainly include: mobility management, such as user attachment, establishment of participating user IP bearers. The functions of the PDN GW mainly include: IP address allocation management, bearer policy control, and packet filtering.

The inventor noticed in the course of the invention that in the prior art, the user can only obtain services (such as voice calls, data calls) from the MSC through the circuit domain access network. So far, the UE cannot obtain services from the MSC through a packet access network (such as SAE), such as VoIP service, data call service, short message service, and supplementary service. Summary of the invention

The embodiments of the present invention provide a system, an apparatus, and a method for providing a service for a user equipment, which are used to solve the problem that a UE that is covered by a packet network can obtain a service from an MSC in a circuit domain core network through a packet access network.

Embodiments of the present invention provide a system for providing services for user equipment, including a packet access network, a mobile switching center in a circuit domain, a user equipment accessing a wireless communication network via a packet access network, and a packet access unit. , configured to provide a signaling channel between the packet access network and the mobile switching center in the circuit domain;

The user equipment performs signaling interaction with the mobile switching center to establish a service through the packet access network via the signaling access network.

Further, the packet access unit includes a bearer channel management unit, configured to be used according to user equipment The required business requirements, management (such as establishing, modifying or releasing) the media channel between the user equipment and the mobile switching center for carrying the service;

The user equipment performs media transmission with the mobile switching center via the media channel via a packet access network.

The embodiment of the invention further provides a method for providing a service for a user equipment, including:

Establishing a signaling channel between the user equipment via the packet access network, the packet access unit, and the mobile switching center in the circuit domain;

The user equipment and the mobile switching center transmit the service related message through the signaling channel established by the packet access unit, and the mobile switching center provides the service to the user based on the signaling channel.

Further, the method may further include:

Establishing, modifying, or releasing media channels between the user equipment and the mobile switching center according to the service requirements established by the user equipment;

The embodiment of the invention further provides an apparatus for providing a service for a user equipment, including:

a packet access unit, configured to establish a signaling channel between the packet access network and the mobile switching center in the circuit domain;

The beneficial effects of the embodiments of the present invention are as follows:

When providing services for the user equipment, the embodiment of the present invention first establishes a signaling channel between the packet access network and the mobile switching center in the circuit domain; and then causes the user equipment to pass the signaling channel and the mobile switching center through the packet access network. The signaling interaction for establishing the service is performed, so that the user located in the packet domain can perform signaling interaction required for service establishment with the MSC in the circuit domain.

And further, according to the service requirement that the user equipment needs to establish, manage the service bearer channel between the user equipment and the mobile switching center for carrying the service; for example, when the user needs to perform the voice call service and the data call service, the user equipment is connected by the packet The network access service is performed by the service bearer channel and the mobile switching center, so that the packet network coverage is used to provide users with various services that can be obtained through the circuit domain access mode, and the packet network and the circuit domain core network are improved. The efficiency of use enables users to obtain services from the MSC through the packet network, which is beneficial for operators to fully utilize packet network coverage. To provide users with various services that can only be obtained through circuit domain access, it can significantly improve the efficiency of network usage. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic diagram of a WCDMA network architecture in the 3GPP TS23.002 V640 according to the prior art; FIG. 2 is a schematic diagram of a non-roaming SAE architecture in the background art;

3 is a schematic structural diagram of a system for providing a service to a user equipment according to an embodiment of the present invention; FIG. 4 is a schematic diagram of a bearer allocated by the MSC side according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of bearer allocated by the UE side according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of bearer allocated by the packet access unit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the packet access unit serving as a media information transmission agent according to an embodiment of the present invention; FIG. 8 is a schematic diagram of the instant message processing short message service according to an embodiment of the present invention;

FIG. 9 is a schematic flowchart of a method for implementing a service for a user equipment according to an embodiment of the present invention; FIG. 10 is a schematic diagram of a call flow process performed by a user as a calling party according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a call flow process in which a user makes a call when the UE side uses the SIP session mode according to the embodiment of the present invention;

FIG. 12 is a schematic diagram of a call flow of the user #zhang called in the embodiment of the present invention;

13 is a schematic diagram of a call flow process performed by a user when a UE side uses a SIP session mode according to an embodiment of the present invention;

FIG. 14 is a schematic flowchart of a user service change implementation process according to an embodiment of the present invention;

15 is a schematic flowchart of a supplementary service implementation process of the user in the embodiment of the present invention;

FIG. 16 is a schematic diagram of a flow of implementing a short message service of a user according to an embodiment of the present invention. detailed description

Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiments of the present invention need to solve how to access a user under a packet network network through a packet domain access network. The MSC of the circuit domain acquires the problem of services such as VoIP service, data call service, short message service, and supplementary service. Thereby enabling the UE to acquire traffic from the MSC through the packet access network. It is easy to understand that, as the embodiment of the present invention solves the problem, the user in the coverage of the packet network obtains the service from the MSC in the core network of the circuit domain. Therefore, the users in the coverage of the packet network in the embodiment of the present invention are not necessarily simultaneously. Located under the circuit domain coverage.

FIG. 3 is a schematic diagram of a system structure for providing services for user equipment. As shown in the figure, the system includes a packet access network in a packet domain, a mobile switching center in a circuit domain, and a user accessing a wireless communication network via a packet access network. The device further includes a packet access unit, which is respectively connected to the packet access network and the mobile switching center, and can be used to provide a signaling channel between the packet access network in the packet domain and the mobile switching center in the circuit domain, and can provide the UE and the MSC. The inter-message routing function can also provide an adaptation function for the UE that is compatible with the SIP as the session control protocol to obtain the service from the MSC;

The user equipment performs signaling interaction with the mobile switching center to establish a service through the packet access network via the packet access network.

The packet access unit may further include a bearer channel management unit, configured to manage a media channel between the user equipment and the mobile switching center for carrying the service according to the service requirement that the user equipment needs to establish; the user equipment passes through the packet access network. The media channel and the mobile switching center perform media transmission.

Packet access networks include, but are not limited to, legacy SAE or GPRS or CDMA2000 packet domain networks. As an enhancement, it is also possible to support providing the MSC with location information of the UE.

Packet Access Unit: It is a newly set entity. In implementation, it can be a logical entity or a physical entity. At present, the traditional MSC only supports access in the circuit domain mode, and does not support packet access. Since packet access and circuit access are two different access modes. Therefore, in order to provide a packet for accessing the MSC to provide services for the user, an embodiment of the present invention provides an entity between the packet access network and the MSC to implement the function. In the embodiment, the entity is referred to as packet access. Unit, the main function of the unit is to provide signaling channel between UE and MSC, dialog management, support for packet access bearer operation for MSC control, and possible packet bearer conversion, such as ATM (Asynchronous Transfer Mode) Conversion with IP. From an implementation point of view, the entity may be located in the MSC or may exist separately or in a packet access network. When integrated into the MSC, the legacy MSC and packet access unit can be considered together to form an enhanced MSC.

As shown in the figure, in the implementation, the MSC is connected to the packet access unit through the interface 1, and the packet access unit is connected to the packet access network through the interface 2, where: Interface 1:

The interface between the MSC and the packet access unit. The interface can be an external interface or an internal interface (if the packet access unit is integrated into the MSC, the access is an internal interface), and the interface can be an Iu interface, or an A interface, or other forms of interfaces. The connection relationship between the MSC and the packet access unit may be one-to-one, one-to-many, many-to-one or many-to-many. However, the one-to-many, many-to-one or many-to-many approach is not applicable to the case where the interface is an internal interface.

Interface 2:

An interface between a packet access unit and a packet access network. The interface may be in the form of a Gi/SGi interface, an Rx+/Rx interface, and one or a combination of interfaces added between the packet access unit and the mobility management entity, or may be an internal interface (if the packet access unit is merged) In the case of a packet access network, the access is an internal interface) or other form of interface. The connection relationship between the packet access unit and the packet access network may be one-to-one, one-to-many, many-to-one or many-to-many. However, the one-to-many, many-to-one or many-to-many approach is not applicable to the case where the interface is an internal interface.

That is, the implementing packet access unit is connected to the packet access network through the Gi/SGi interface, the Rx+/Rx interface, one of the newly added interfaces between the packet access unit and the mobility management entity, or through the analog Iu interface or The analog A interface is connected to the mobile switching center;

Or, the packet access unit is located in the packet access network, and is connected to the packet access network through an internal interface of the packet access network, and is connected to the mobile switching center through an analog Iu interface or an analog A interface;

Or, the packet access unit is located in the mobile switching center, and is connected to the packet access network through one or a combination of a Gi/SGi interface, an Rx+/Rx interface, and a new interface between the packet access unit and the mobility management entity. The internal interface of the mobile switching center is connected to the mobile switching center, as shown in the following figure, including but not limited to: X, or (X, Rx+/Rx), or Gi/SGi, or (Gi/SGi, Rx+) /Rx ), or (X, Gi/SGi, Rx+/Rx ).

The services provided for the UE may include: basic services (including telecommunication services, bearer services) and;

1. Voice call service (can be divided into telecommunication services);

Such as emergency call services and ordinary voice call services.

2. Data call service;

Such as fax (which can be divided into telecommunication services) and bearer services.

3. Short message service (can be divided into telecommunication services); 4. Supplementary business.

The specific embodiments of the present invention will be further explained from the message transmission channel, message routing, media negotiation and media bearer setup, dialog mechanism, paging processing, supplementary service, short message service, and call service message interaction.

First, the implementation of the message transmission channel (signaling channel):

1), implementation of the message transmission channel between the UE and the packet access unit:

The channel used for message transmission between the UE and the packet access unit can be implemented in the following two ways:

Manner 1: The IP bearer of the packet access network is used (including the default IP bearer established by the packet access network for the UE when the UE is attached to the packet access network; or the IP bearer established separately in the packet access network, For example, the dedicated bearer of the SAE and the bearer established by the GPRS using the PDP (Packet Data Protocol) context activation process). And using the external interface (such as Gi or SGi) interface provided by the packet data network gateway to form a message transmission channel between the UE and the packet access unit, the basic feature of the message transmission channel is that the channel passes through the packet data network gateway. The message transmission channel between the UE and the packet access unit can use a transmission protocol such as TCP or UDP or SCTP.

Manner 2: using the original message transmission channel between the UE and the mobility management entity in the packet access network, and adding an interface between the mobility management entity and the packet access unit to form a message transmission between the UE and the packet access unit aisle. The basic feature of the message transmission channel is that the channel passes through the mobility management entity.

2) Implementation of the establishment of a message transmission channel between the packet access unit and the MSC:

The channel used for message transmission between the packet access unit and the MSC may be provided by means of an analog Iu-CS or an analog A interface or a radio access network control interface of a network such as CDMA2000 or other forms of interface, if the MSC is connected to the packet When the unit is integrated, the channel is located in the internal interface. In this case, the implementation of the channel is not limited to the above form.

Second, the implementation of message routing:

The UE, the packet access unit, and the MSC need to deliver messages when performing services, and the routing of the interactive message process can be implemented as follows:

1. Message routing between the UE and the packet access unit.

1) A routing packet access unit determining module of the message sent by the UE to the packet access unit, configured to determine a target packet access unit of the message sent by the UE. Specifically, there are three ways for the UE to send a message to the packet access unit:

A. The message sent by the UE carries the address information of the packet access unit, and the information may be carried by the mobility management entity in the attach response message to the UE when the UE is attached to the packet access network, and the information may be from the UE. The mobility management entity itself, or from the packet data network gateway; or, when the bearer is established, the information is provided by the packet data network gateway to the mobility management entity through the bearer setup response message, and then provided by the mobility management entity The UE obtains the configuration information from the network through the DHCPv6 mode, and the address information of the packet access unit is configured in advance by the DHCP server in the network; or the information is configured in the UE (terminal or user card), and the packet is accessed in the network. The packet data gateway or mobility management entity routes the message from the UE to the packet access unit based on the address information.

B. When the message is sent to a packet data network gateway (e.g., PDN GW or GGSN), the packet access network unit determines the packet access unit and routes the message to the packet access unit. Packet Data The network gateway can pre-configure its correspondence with the packet access unit, and determine the target packet access unit based on the relationship. If the packet data gateway is connected to the plurality of packet access units, the packet data network gateway may determine the target packet access unit according to the location information or the user identity information of the UE, or determine the target packet access unit from a load uniform angle, or determine arbitrarily. A target packet access unit. Further, in order to send subsequent messages of the same user to the same MSC for processing, the packet access unit may achieve the purpose by using a method of recording the determination result, which may be completed when the user location is updated, and the recorded result is used in the call. .

C. The message is sent to the mobility management entity, which determines the packet access unit by the mobility management entity and routes the message to the packet access unit. The mobility management entity may pre-configure its correspondence with the packet access unit, and determine the target packet access unit based on the relationship. If the mobility management entity is connected to multiple packet access units, the mobility management entity may determine the target packet access unit according to the location information or the user identity information of the UE, or determine the target packet access unit from the perspective of load balancing, or The target group access ticket is arbitrarily determined. Further, in order to enable subsequent messages sent by the same user to the same MSC for processing, the mobility management entity may achieve this by using a method of recording the determination result, which may be completed when the user location is updated, and the recorded result is used at the time of the call. .

2) The packet access unit sends a route of the message to the UE.

The packet access unit may include a UE determining module, configured to determine target UE address related information, This is used to route messages. There are two specific ways:

A. The packet access unit routes the message to the UE via the packet data network gateway according to the IP address information of the UE.

The packet access unit acquires the IP address of the UE and can be implemented as follows:

The packet access unit first receives a message from the UE, and carries the IP address information of the UE in the message, so that the packet access unit acquires the IP address information of the UE. For example, the packet access unit receives the location update request message from the UE, and includes the address information of the UE in the location update message. The packet access unit may also send the message to the UE before receiving the message (for example, receiving the response from the MSC). Obtaining the address information of the UE from the packet access network by the paging message or the call setup message of the UE: The packet access unit may query the UE according to the configuration relationship of the mobility management entity (such as the MME) of the packet access network Address information. The configuration relationship may be the UE user identity or the correspondence between the location of the user and the mobility management entity. In this case, the packet access unit may obtain the address information of the UE from the mobility management entity corresponding to the UE. It can also be embodied as all the mobility management entity address information recorded by the packet access unit, and in this case, the packet access unit can query all the mobility management entities connected thereto to obtain the address information of the UE.

B. The packet access unit determines address information of the mobility management entity corresponding to the UE, and routes the message to the UE via the mobility management entity. The packet access unit may determine the target mobility management entity by using a UE user identity or a correspondence between the location of the user and the mobility management entity, or the packet access unit first receives a message from the mobility management entity about the UE. According to the mobility management entity address information in the message, the packet access unit records the mobility management entity corresponding to the UE, and the packet access unit determines the mobility management entity in this manner; the message between the mobility management entity and the UE The route can be the same as the existing one, such as the route of the attach response message between the UE and the mobility management entity.

2. Message routing between the packet access unit and the MSC.

1), the packet access unit sends a message to the MSC.

The packet access unit may include an MSC determining module for determining a target MSC in which the packet access unit sends a message:

Specifically, for the case where the MSC and the packet access unit are one-to-one or one-to-many, the packet access unit can determine the unique MSC, and the packet access unit can send the message by configuring the address information of the MSC in the packet access unit. Routing to the MSC;

If a packet access unit is connected to one or more MSCs, a packet access unit may select one The MSCs are the target MSCs, and the method for selecting the MSCs may be:

The packet access unit may pre-configure its correspondence with the packet access unit, and determine the target MSC based on the relationship. If the packet access unit is connected to the plurality of target MSCs, the packet access unit may determine the target MSC according to the location information or the user identity information of the UE, or determine the target MSC from a load uniform angle, or arbitrarily determine the target MSC, or obtain the target MSC first. The address information of the MSC (the method is the same as the method for the UE to obtain the address information of the packet access unit described above), the UE sends a message to the packet access unit to carry the address information of the MSC, and the packet access unit determines from the message. Target MSC. Further, in order to cause the user to send subsequent messages to the same MSC for processing, the packet access unit can achieve this by using the method of recording the determination result, which can be completed when the user position is updated, and the recorded result is used at the time of the call.

2) The MSC sends a message to the packet access unit.

The MSC may include a packet access unit determining module, configured to determine address related information of the target packet access unit of the message sent by the MSC, to perform message routing, as follows:

The packet access unit determining module determines the address information of the target packet access unit according to the location information of the UE, the mapping relationship between the location information and the packet access unit, to perform message routing.

Alternatively, the MSC first receives a UE related message from the packet access unit, and carries the address information of the packet access unit in the message, so that the MSC acquires the address information of the packet access unit corresponding to the UE. For example, the MSC receives a location update request message from the packet access unit, and the location update message contains the address information of the packet access unit. Further, the MSC may record the correspondence between the UE and the packet access unit when the user location is updated, and determine the target packet access unit when subsequently sending the message to the packet access unit.

Third, the implementation of media negotiation and bearer control:

If media communication is required in the service process (for example, if the user is performing a call service, a media channel needs to be established for media communication, but if the short message service is performed, it is not required), the UE and the network side are required at this time. The incoming unit and the MSC perform media negotiation and establish a service bearer channel for the call for media data transmission.

The process can be implemented as follows:

Media negotiation and media data transfer.

The bearer channel management unit includes a mobile switching center side management module and a packet access network side management module, where: The mobile switching center side management module allocates or reclaims the local bearer resources, establishes, modifies, or releases

Bearer on the MSC side;

The packet access network side management module manages bearers of the UE side (between the UE and the packet data network gateway). Further, the bearer channel management unit further includes a packet access unit management module, and manages the bearer of the packet access unit and the UE side and the MSC side. This is mainly applicable to the case where the MSC and the packet access unit use the ATM transmission mode, and can also be applied to the case where both the MSC and the packet access unit use the IP transmission mode.

The system may further include a media negotiating unit, configured to perform media negotiation information negotiation on the UE side and the MSC side. The media negotiation unit may include a user equipment side media negotiation module and a mobile switching center side media negotiation module, where:

a mobile switching center side media negotiation module, configured to send and receive media description information to and from the MSC direction;

The user equipment side media negotiation module is configured to send and receive media description information to and from the UE direction.

The user equipment side media negotiation module carries the media description information in a Setup (call setup) message when the UE makes a call, and carries the media description information on the call confirmation, ringing, and the call when the UE is called. Send a message in one of the connections;

The mobile switching center side media negotiation module carries the media description information in a message of one of call progress, ringing, and connection when the UE makes a call; when the UE is called, the media description information is carried. Sent in a message in one of Setup (Setup), Information, Notify, Facility.

The media negotiating unit may further comprise a packet access unit media negotiation module, configured to negotiate media description information between the packet access unit and the UE, and negotiate media description information between the packet access unit and the MSC.

The packet access unit media negotiation module may also send the media description information in the message to the MSC in the assignment completion message when receiving the message containing the media description information from the UE direction, or directly send the message from the MSC. The message in the UE direction containing the media description information is sent to the MSC, and the purpose of sending the media description information to the MSC may also be achieved.

The packet access unit media negotiation module, after the bearer conversion module allocates the same bearer as the UE side, provides the media description information corresponding to the bearer to the UE, and after the bearer conversion module allocates the same bearer as the MSC side, the The packet access unit media negotiation module compares the media description letter corresponding to the bearer The information is provided to the MSC.

The media negotiating unit adds a cell to the message to deliver the media description information, or includes the media description information along with a call control message (such as call setup, or call progress, ringing, answering, information, notification, etc.). The media description information is delivered in an IP data packet. The media description information may contain one or a combination of the following information: IP address and port, ATM address, codec type.

Specifically, when the media negotiates, the MSC provides MSC-side media information to the packet access side (the packet access unit and the UE), and the UE provides the UE-side media information to the network side (the packet access unit and the MSC), and the packet access unit It is also possible to provide media information to the UE and the MSC. The media information includes at least one of the following information: codec information of the media stream to be established, bearer information (IP address and port, or ATM address information) allocated by the UE side, the packet access unit, and the network side respectively for media transmission. ), media transmission protocol information.

After the media negotiation is completed, a data transmission channel between the UE and the MSC is established according to the result of the media negotiation, so that media data can be transmitted between the UE and the MSC.

1), establishment and implementation of MSC side bearers:

Before the MSC provides the MSC-side media information to the packet access side (the packet access unit and the UE), the MSC allocates the local resource, and obtains the address information (IP address and port, or ATM address information) of the 7-load resource. If the MSC is a separate architecture (i.e., the MSC is decomposed into an MSC server and an MGW), the bearer resources are located at the MGW (Media Gateway). Figure 4 is a schematic diagram of the bearer allocated on the MSC side. The allocated bearer resources are shown in circle 4 on the figure.

2), the implementation of the UE side bearer (from the packet data network gateway (boundary gateway) in the packet access network to the bearer between the UEs):

After the UE provides the media information of the UE side to the network side (the packet access unit and the MSC), the packet access unit initiates a UE side bearer setup procedure to the packet access network: the packet access unit provides the UE side bearer to the packet access network. Descriptive information, such as QoS-related parameters, and the IP address and port information of the UE, the packet access network establishes bearers on the UE side based on the information. The timing of establishing the start of the bearer is not limited to being after the packet access unit receives the assignment command of the MSC. FIG. 5 is a schematic diagram of a bearer allocated on the UE side, which is an allocated bearer resource as shown by a circle 1 in the figure.

3), the bearer access unit establishment implementation:

The bearer channel establishing module may further include a bearer switching submodule, configured to allocate the same bearer resource as the UE side and the MSC side when the media bearer of the UE side is inconsistent with the media bearer type of the MSC side, and perform bearer transfer. Change.

Specifically, if the MSC provides the bearer in the ATM mode and the UE uses the bearer in the IP mode, the packet access unit performs the IP bearer and the ATM bearer. The packet access unit allocates the IP bearer resource and the ATM bearer resource, obtains the address information of the IP bearer resource and the ATM bearer resource, and provides the IP bearer resource address and the port information to the UE, and provides the ATM bearer resource address information to the MSC (if the MSC Is a separate architecture, the ATM access link control application protocol provides ATM bearer information on the packet access unit side to the MGW). The data is transmitted between the UE and the packet access unit by means of the IP, and the data is transmitted between the packet access unit and the MSC by using the ATM mode, and the bearer of the packet access unit is connected to the bearer on both sides.

This method is also applicable to the case where the MSC provides an IP mode bearer.

Figure 6 is a schematic diagram of the bearer allocated by the packet access unit, which is the allocated bearer resource as shown in the circle of No. 2 and No. 3.

4), the packet access unit acts as an implementation of the media information transfer agent:

If both the MSC and the UE side use the bearer in the IP mode, the packet access unit transmits the bearer information (IP address and port) from the UE side to the MSC, and transmits the bearer information from the MSC side to the UE, so that the UE And the MSC sends the media data directly to the other party without the packet access unit. FIG. 7 is a schematic diagram of the packet access unit acting as a media information transmission agent, as shown in the figure: the UE and the MSC exchange the bearer information of the other party through the packet access unit, The media between the UE and the MSC does not have to go through the packet access unit.

5), the implementation of the media description information delivery method:

When the UE is making a call, the UE may attach the media information to the packet access unit by attaching the media information to the packet access unit. When the MSC uses the IP mode bearer, the UE accesses the Setup message or sends an assignment response message to the MSC. Providing the UE side media information to the MSC, and providing the address information of the ATM bearer established by the packet access network for the UE to the MSC through the access link control application protocol when the MSC adopts the ATM mode bearer (the MSC can use the unified one) Or separating the architecture, when the split architecture is used, the information is provided to the MGW, and the packet access unit provides the media information on the network side to the UE in a message of one of call progress, ringing, and connection;

When the UE is making a call, the UE may transmit the media information of the UE side to the Call Confirmed or Ringing or Connect message to the packet access unit, and the packet access unit confirms or rings or connects through the call. The message carries the bearer information, or carries the bearer in the assignment response message sent to the MSC. The information is provided to the MSC, and the packet access unit provides the network side media information to the UE in a Setup (Information Setup) or Information (Information) or Notify (Notification) or Facility (Device) message.

Specifically, the codec information in the media information can be transmitted in the original manner between the MSC and the UE. The rest of the information (address information, such as IP address and port, or ATM address, codec information, etc.) can be delivered via a separate message; it can also be passed in an additional manner on the call message between the original MSC and the UE.

If the latter method is used, the additional method may be: defining a cell in a call message (such as a Setup message), carried in the message, or as a piece of information juxtaposed with the original message, and encapsulated in the IP data together in the bag.

When the packet access unit provides media information to the MSC, there are two cases: First, if the MSC uses the IP mode bearer, the packet access unit may provide the UE side media information to the MSC through the Setup message. The packet access unit may also provide bearer information to the MSC when sending the assignment response message to the MSC. Second, if the MSC uses the ATM mode bearer, in this case, the ALCAP (Access Link Control Application) may be used. Protocol, Access Link Control Application Protocol) protocol description is done.

Implementation of the dialogue mechanism:

In the process of message interaction, the UE and the packet unit perform message delivery, and a dialogue mechanism is needed to associate each service-related message.

In the implementation, if the UE can only perform one service at a time, an IP connection for transmitting a message can be established between the UE and the packet access unit. The IP connection can be identified by the UE's IP address, port, and IP address and port assigned by the packet access unit. When the service is initiated, the IP address and port information of the other party can be exchanged by the two parties to establish the IP connection. The port information can also use the default agreement. In this case, the port information does not need to be exchanged. The UE and the packet access unit can use the IP connection to associate the sent and received messages with the service. Since there is only one IP connection for transmitting a message between a UE and a packet access unit, the UE does not end before the service ends. And the messages sent and received by the packet access unit using the IP connection can be related to the currently ongoing service.

If the UE is to be able to perform multiple services at the same time, a dialogue mechanism is needed to enable the UE and the packet access unit to associate the message with each parallel service. The mechanism of the dialogue can be implemented in the following two ways:

A. Establish a dedicated IP connection for each service. Only one service phase is delivered in one IP connection. Closed message. The IP connection is identified by the IP address, port, and IP address and port assigned by the packet access unit. When a call is initiated, the IP connection is established by exchanging the IP address and port information of the other party. In the implementation, an IP connection can be implemented by using a TCP/UDP/SCTP (Transmission Control Protocol) connection. Messages in the implementation of call hold services and call waiting services can be delivered in an IP connection along with the original call message.

B. Use an IP connection to transmit messages for multiple parallel services. This requires identifying the messages for each service to distinguish messages belonging to individual services. The method for identifying the service may be: when the initiating service initiates the service, the service is assigned an identifier for the service, and is provided to the other party. In the message interaction process of the current service, the information is carried in the message, and the two parties can Correspond to each business. The service ID is released after the call is completed. After the service is completed, the identity can be used for newly initiated services.

Another embodiment may be: when the other party receives the identifier assigned by the initiator, the other party also assigns an identifier to the service, and the two identifiers collectively represent the current service, and the two parties exchange the identification information assigned by the two parties. The message interaction process carries these two identifiers to associate the message with the service.

For example, the UE initiates a call to the packet access unit, the UE allocates the call identifier 1 , and after receiving the identifier, the packet access unit allocates the call identifier 1 , then [( UE: ) 1 , (group access unit: ) 1] is the present Identification of the secondary call; if the UE initiates another call in parallel, the UE allocates 2, the packet access unit 2, then [(UE: ) 2, (Packet Access Unit: ) 2] is the identity of the call; if the UE or The packet access unit initiates a call to the other party at the same time, and the UE allocates 3, and the identifier 3 of the packet access unit is occupied because it initiates a call to the UE, so the packet access unit allocates 4, therefore, [(UE: ) 3, (Packet Access Unit: ) 4] The identity of the call initiated by the UE, for the same reason, [(Packet Access Unit:) 4, (UE: ) 3] is the call initiated by the packet access unit Logo. The solution is suitable for all types of services, such as calling or short message services.

Another embodiment may be: the identifier is still assigned by the initiator, and is transmitted to the other party. In the subsequent message interaction process, the message sender carries the call initiator identifier in addition to the identifier, thereby distinguishing different call.

For example, when the UE initiates a call to the packet access unit, the call identifier 1 is assigned to the packet access unit, and when the UE sends the call message or the reverse send message to the packet access unit, the call identifier is carried. 1 and the "UE initiated" identity, the UE and the packet access unit are then able to find the call corresponding to the message. If the UE initiates the second call at the same time, the call identity 2 is assigned, then 2 and "UE initiated" can be used to identify the new call, and the receiver can associate the message with the call. The solution is applicable to all types of services, such as calling or short message services.

Fifth, the implementation of paging processing:

If the user conducts a call service or a short message service, when the user makes a call, the MSC will page the user according to the situation in which the UE accesses the MSC through the circuit domain.

If the user UE accesses the MSC through the packet access network for service, when the user makes a call, the MSC may not page the user. The MSC can determine, by the location information of the user, that the user is accessed through the packet access network, or the user carries an identifier to the MSC when the location is updated to transmit information that the user updates through the location of the packet access unit, and the MSC further performs The process of not paging the user is issued. Or, the MSC still pages the user, and when the packet access unit receives the message, it replies to the MSC with a page response message.

6. Implementation of supplementary services:

Through the established message interaction signaling channel and the existing supplementary service support capability of the MSC, the UE can perform supplementary service interaction with the MSC, thereby providing the user UE with the same supplementary service as the circuit domain access. The supplementary services include but are not limited to: calling/connected number display and restriction, call forwarding (unconditional forward/unable forward/no answer forward/busy forward), call deflection, call waiting, call Hold, explicit call forwarding, multi-party calling, and multi-call services.

VII. Implementation of short message service:

1), through the established message interaction signaling channel, and the existing short message support capability of the MSC, the UE can interact with the MSC for the short message service of the circuit domain, and then provide the same short message service when the user accesses through the circuit domain. .

2), the message service can also be implemented by other means, for example: the MSC can keep the processing of the short message service in the circuit domain unchanged, and the UE can use the SIP IM (Session Initiation Protocol Instant Message) processing method. In this case, only the packet access unit performs mutual conversion between the UE side SIP IM message and the message in the circuit domain short message service identifiable by the MSC. FIG. 8 is a schematic diagram of the instant message processing short message service, as shown in the figure. It is shown that if both the UE and the MSC use the SIP instant message format, the packet access unit does not need to perform a format conversion operation.

Eight, the implementation of call business message interaction: 1), the form of the call message:

If both the UE and the MSC use the circuit domain call setup message or the SIP (Session Initiation Protocol) session setup message, the packet access unit does not need to perform the format conversion operation.

However, if the MSC still maintains the processing mode of the circuit domain call, and the UE uses the SIP session establishment mode, the packet access unit needs to convert the SIP session establishment process on the UE side with the call establishment process of the MSC.

2), billing related processing:

When a user initiates a service through a packet access network, the operator may draw different rates for the call. In order for the MSC to perceive this, the MSC may use the location information of the UE or discover that the user is through the packet access network. The location change, and then the user is found to be a call initiated by the packet access network; the MSC can also discover that the user is a call initiated by the packet access network according to the fact that the call is from the packet access unit, which can be accessed through the MSC and the packet. The connection configuration between the units is found, and the UE or the packet access unit may carry an identifier in the message for initiating the call to indicate to the MSC that the user is a call initiated by the packet access network.

If the real-time charging is used, the MSC/SSP (Service Switching Point) also needs to provide the information that the user is a call initiated by the packet access network to the intelligent service processing function SCP (Service Control Point). , Service Control Point), MSC/SSP available at IDP ( Initial

Detection Poin, the initial detection point) The message carries the message to the SCP.

The present invention also provides a method for providing a service to a user equipment, and a specific implementation manner of the method will be described below with reference to the accompanying drawings.

FIG. 9 is a schematic flowchart of a method for implementing a service provided by a user equipment, as shown in FIG. 9, which may include the following steps:

Step 901: Establish a signaling channel between the user equipment, the packet access network, the packet access unit, and the mobile switching center in the circuit domain.

Step 902: The user equipment performs a signaling interaction between the user equipment and the mobile switching center through the signaling access network through the packet access network.

Step 903: Manage a service bearer channel used by the user equipment and the mobile switching center to carry the service according to the service requirement that the user equipment needs to establish;

Step 904: The user equipment passes the signaling channel and the possible service bearer through the packet access network. The road operates with the mobile switching center.

In the implementation, the media channel between the user equipment and the mobile switching center may be established, modified or released according to the service requirement that the user equipment needs to establish; the user equipment transmits the media through the media channel and the mobile switching center via the packet access network.

The establishing or modifying the media channel between the user equipment and the mobile switching center may include the following steps: the user equipment and the mobile switching center send media negotiation messages to each other;

Establishing, modifying, or releasing the user equipment to the mobile switching center media channel according to the media negotiation message.

In the implementation, the mobile switching center may also carry the bearer resource address related information in the media negotiation message to the user equipment after the local bearer resource is allocated or modified.

The user equipment may carry the bearer resource address related information in the media negotiation message to the mobile switching center.

In an implementation, the media channel between the user equipment and the mobile switching center may include a bearer between the user equipment and the packet data network gateway, and a bearer between the packet data network gateway and the mobile switching center, and the packet access unit may be according to the media. The media description information in the negotiation message controls the packet access network to establish, modify or release the bearer between the user equipment and the packet data network gateway, and the bearer between the mobile switching center and the packet data network gateway. That is, the packet access unit controls, according to the media description information in the media negotiation message, the packet access network to establish, modify, or release the bearer between the user equipment and the packet data network gateway, and the bearer between the mobile switching center and the packet data network gateway, The segment bearer constitutes the user equipment to the mobile switching center media channel.

The packet access unit may also separately allocate the bearer resources of the user equipment side and the mobile switching center side; and then carry the corresponding bearer resource address related information in the media negotiation message, and send the information to the user equipment direction and the mobile switching center respectively. That is, the grouping unit between the user equipment and the mobile switching center participates in the media negotiation, and the participation is performed by the group access unit separately assigning the bearer resources of the user equipment side and the mobile switching center side, and carrying the corresponding bearer resource address related information. The media negotiation message is sent to the user equipment direction and the mobile switching center respectively.

In the implementation, the packet access unit and the user equipment side send and receive SIP protocol messages, and the packet access unit and the mobile switching center side transmit and receive circuit domain service messages; the packet access unit performs protocol conversion on the SIP protocol of the user equipment, and obtains services from the MSC. . Services can include call services and/or messaging services.

In implementation, the packet access unit can be located in the mobile switching center, through the interior of the mobile switching center The interface establishes a signaling channel and a media channel; the packet access unit may also be located in the packet access network, and establish a signaling channel and a media channel through an internal interface of the packet access network. When the packet access unit and the mobile switching center are integrated to form an enhanced mobile switching center, the signaling channel and the media channel between the packet access unit and the mobile switching center are located at an internal interface of the enhanced mobile switching center; or The packet access unit is a separate physical entity; or the packet access unit is integrated with the packet access network to form an enhanced packet access network.

In the implementation, when the UE is the calling party, the media information is added to the MSC in the Setup message. When the MSC uses the IP mode bearer, the UE side media information is sent through the Setup message or when the assignment response message is sent to the MSC. Provided to the MSC, when the MSC adopts the ATM mode bearer, provides the UE side media information to the MSC through the access link control application protocol, and attaches the network side media information to the message progressing, ringing, and connecting one of the messages. Provided to the UE;

When the UE is called, the media information of the UE is added to the MSC in the call confirmation message, and the bearer information is carried in the call confirmation message, or the bearer response message sent to the MSC is carried in the bearer response message. To the MSC, the media information on the network side is attached to the UE in a Setup, Information or Notify or Facility message.

The embodiment of the invention further provides a device for providing a service for a user equipment, which is used for establishing a signaling channel between a packet access network and a mobile switching center in a circuit domain;

The user equipment performs a signaling interaction between the user and the mobile switching center through the packet access network through the packet access network.

The packet access unit establishes a signaling channel between the packet access network and the mobile switching center in the circuit domain, including establishing a signaling channel between the UE and the packet access unit and between the packet access unit and the MSC:

Manner 1: The IP bearer of the packet access network is used (including the default IP bearer established by the packet access network for the UE when the UE is attached to the packet access network; or the IP bearer established separately in the packet access network, For example, the dedicated bearer of the SAE and the bearer established by the GPRS using the PDP (Packet Data Protocol) context activation process). And using the external interface (such as Gi or SGi) interface provided by the packet data network gateway to form a message transmission channel (or called a signaling channel) between the UE and the packet access unit, the basic feature of the message transmission channel is that the channel is grouped. Data network turn off. The message transmission channel between the UE and the packet access unit may use a transmission protocol such as TCP or UDP or SCTP.

The device may further include a bearer channel management unit, configured to manage a media channel between the user equipment and the mobile switching center according to a requirement for the user equipment to establish a service; and the user equipment exchanges with the mobile device by using the media channel through the packet access network. The center conducts media delivery.

The implementation bearer channel management unit may include a mobile switching center side management module and a packet access network side management module, where:

a mobile switching center side management module, configured to allocate or reclaim bearer resources on the MSC side, establish, modify, or release a media channel between the packet data network gateway and the MSC in the packet access network;

The packet access network side management module is configured to establish, modify, or release a media channel between the UE and the packet data network gateway in the packet access network.

The bearer channel management unit may further include a bearer conversion module, configured to allocate the same 7-carrier resources as the UE side and the MSC side when the packet access network side is inconsistent with the 7-carrier type of the MSC side service channel, and perform bearer conversion.

The bearer channel management unit may further include a packet access network bearer control module, configured to control the packet access network side management module to establish, modify, or release the media channel between the UE and the packet data network gateway in the packet access network.

The apparatus may further include a media negotiating unit, configured to perform media description information negotiation between the UE side and the MSC side.

The media negotiation unit may include a user equipment side media negotiation module and a mobile switching center side media negotiation module, where:

User equipment side media negotiation module, configured to send and receive media from the MSC direction Describe the information and negotiate;

The mobile switching center side media negotiation module is configured to send and receive media description information to and from the UE direction.

The user equipment side media negotiation module may be further configured to: when the UE is called, carry the media description information in a Setup (call setup) message; when the UE is called, the media description information is carried. Transmitting in a call confirmation or ringing or connection message; and/or, the mobile switching center side media negotiation module is further configured to carry the media description information in a call progress, ringing or connection message when the UE is calling Transmitting; when the UE is called, the media description information is carried in a call setup, information, notification or device message.

The packet access unit media negotiation module may be further configured to: when receiving the message containing the media description information from the UE, carry the media description information in the message in the assignment completion message, and send the message to the MSC, or use the original The message describing the media description information sends the media description to the MSC.

The packet access unit media negotiation module may be further configured to: after the bearer conversion module allocates the same bearer as the UE side, provide the media description information corresponding to the bearer to the UE, where the bearer conversion module allocates the MSC side After the same bearer, the packet access unit media negotiation module provides the media description information corresponding to the bearer to the MSC.

The media negotiating unit adds a cell to the message to deliver the media description information, or the media description information is included in the IP data packet in parallel with the original message (call control message) to deliver the media description information.

The device may further include a protocol conversion module, configured to provide a protocol conversion for the terminal supporting the SIP protocol, and obtain the service from the MSC.

The protocol conversion module may be further configured to: when the service is a call service, convert the SIP session flow on the UE side with the circuit domain call flow on the MSC side; when the service is a message service, the protocol conversion module will use the UE The SIP instant message flow on the side is converted with the circuit domain short message flow on the MSC side.

The following is a concrete example to illustrate how to implement.

Embodiment 1 FIG. 10 is a schematic diagram of a call flow process performed by a user as a calling party. The core network in this embodiment is

For example, WCDMA R4, the packet access network uses SAE as an example. As shown in the figure, when the user makes a call, it can be implemented as follows:

Step 1001: The UE sends a CM service request (CM service request) message to the MSC server, where the message is encapsulated in an IP format. In order to be able to first route the message to the packet access unit, the message carries the packet access unit. The address, after receiving the message, the packet access unit sends the message to the MSC server.

Step 1002: The MSC server sends a CM service accept message to the UE, where the message arrives at the UE via the packet access unit.

Step 1003: The UE sends a Setup (Call Setup) message to the MSC server, where the message carries the IP address and port information of the UE side of the bearer to be established, and the codec information, and the message arrives at the MSC server through the packet access unit.

Step 1004: The MSC server sends a Call proceeding message to the UE, where the message arrives at the UE via the packet access unit.

Step 1005: The MSC server instructs the MGW to allocate the bearer resource, and the MSC server obtains the description information of the bearer resource.

Step 1006: The MSC server sends an Assignment message to the packet access unit. Step 1007: The packet access unit initiates establishment of a packet access bearer to the PCRF according to the Assignment message.

Step 1008: Establish a SAE dedicated load.

Step 1009: The PCRF returns a bearer setup response message to the packet access unit.

Step 1010: The packet access unit returns an Assignment complete message to the MSC server.

Step 1011: When the called party rings, the MSC server sends an Alerting message to the UE, where the message carries the IP address and port information of the bearer resource allocated by the network side (if the packet access unit participates in the transmission of the media data, Then, the network side corresponds to the packet access unit, and if the packet access unit does not participate in the transmission of the media data, the network side corresponds to the MGW).

Step 1012: When the called party answers, the MSC server sends a Connect message to the UE. Step 1013: The MSC server controls the MGW to adjust the bearer to a bidirectionally-on state.

Step 1014, the calling party initiates the operation of dismantling the call, and the Disconnect disconnects and Release. (release) message.

Step 1015: The MSC server controls the MGW to release the bearer.

Step 1016: The MSC server sends a Release (bearer release) message to the packet access unit. Step 1017: The packet access unit initiates release of the packet access bearer according to the PCRF.

Step 1018: Release the SAE dedicated bearer.

Step 1019: The PCRF returns a bearer release response message to the packet access unit.

Step 1020: The user and the other party interact with the Release complete message, and the call ends. In the above process, in the foregoing process, the MSC Server and the MGW can also be combined into an MSC, and the packet access unit can be integrated into the MSC, that is, the internal interface is used for mutual signaling, which can be regarded as enhancing the MSC, thereby forming An enhanced MSC capable of supporting packet access. The interaction between the MSC and the packet access unit in this embodiment is the internal interaction of the enhanced MSC. This internal interaction is no longer limited to the above implementation.

In step 1003, the process of the UE providing the bearer information (such as the IP address and the port information) to the network side by using the Setup message may also be implemented in the following manner, for example, may be performed in step 1010, that is, the assignment is performed when the assignment is completed. The completion message is provided to the MSC server; the information is also provided to the MSC server by using a CM service request message or a separate message (such as Notify or Information). In the implementation, if an ATM mode bearer is used between the MGW and the packet access unit, The packet access unit needs to complete the conversion between the UE side IP bearer and the MGW side ATM bearer. Specifically, in step 1006, when the packet access unit receives the assignment message, the packet access unit prepares and associates the ATM bearer resource with the MGW. And establishing an ATM bearer with the MGW through the ALCAP protocol; and preparing an IP bearer resource connected to the UE side for IP data transmission with the UE side.

If the operation of preparing the MGW bearer resource in step 1005 is completed before step 1004 (the MSC server sends a Call proceeding message to the UE), the process of providing the UE with the IP address and port information of the bearer resource allocated by the network side in step 1011 may be performed in step 1004. Come on. In this case, steps 1006 and 1010 may be further removed, that is, when the packet access unit receives the Call proceeding message, step 1007 may be directly performed.

This process can be used for voice or data services in the implementation.

If SAE is changed to GPRS (ie, PCRF is used as PDF and PDN GW is used as GGSN), it is easy to see that the above procedure is also applicable to the case where the GPRS network is a packet access network. Obviously, if different related functional entities are used in different networks to implement, this embodiment is also applicable to CDMA2000 or TD-SCDMA network.

In the embodiment, if the MSC Server and the MGW are regarded as MSCs, the illustrated service flow is also applicable to the case where the MSC does not use the separate architecture.

In an implementation, the packet access unit may carry information in the Setup message to indicate to the MSC that the call is initiated from the packet access network, and the MSC is further capable of recording the information that the call is initiated from the packet access network, and the MSC may It is recorded for billing processing. If the MSC supports online charging, the MSC can pass the information to the SCP through the IDP message.

FIG. 11 is a schematic diagram of a call flow process performed by a user in a SIP session mode when the UE side uses the SIP session mode. In the implementation, if the SIP session mode is used on the UE side, the process can be implemented as shown in FIG.

The key to the flow in this embodiment is how to convert the circuit domain call message with the SIP session message. Compared with the flow shown in Figure 10, the changes are mainly as follows:

SIP Invite messages are converted to Setu messages;

The Call proceeding message is converted into a SIP 183 message;

The Alerting message is converted into a SIP 180 message;

The Connect message is converted into a SIP 200 OK message;

The Disconnect message is converted into a SIP Bye message;

The Release complete message is converted to a SIP 200 OK message.

Possible PRACK messages are omitted from the figure, and those skilled in the art will readily appreciate that the message can be sent by the party that received the 183 message and the 180 message.

Embodiment 2

FIG. 12 is a schematic diagram of a call flow process performed by a user. The core network in this embodiment takes WCDMA R4 as an example, and the packet access network uses SAE as an example. As shown in the figure, when the user makes a call, the following may be used. Way to implement:

Step 1201: The MSC server sends a Paging message for the UE to the packet access unit.

Step 1202: The packet access unit returns a paging response message to the MSC server.

Step 1203: The MSC server sends a Setup message to the UE, and after receiving the message, the packet access unit sends the message to the UE.

Step 1204: The UE sends a Call confirmed message to the MSC server, where the message carries the IP address and port information of the UE side of the bearer to be established, and the message is accessed by the packet access unit. Arrive at the MSC server.

Step 1205: The MSC server instructs the MGW to allocate the bearer resource, and the MSC server obtains the description information of the bearer resource.

Step 1206: The MSC server sends an Assignment message to the packet access unit. Step 1207: The packet access unit initiates establishment of a packet access bearer to the PCRF according to the Assignment message, and sends an Information message to the UE to notify the UE of the IP address and port information of the bearer resource prepared by the network side (if the packet access unit participates in the media data) For the transmission, the network side corresponds to the packet access unit, and if the packet access unit does not participate in the transmission of the media data, the network side corresponds to the MGW).

Step 1208: Establish a SAE dedicated load.

Step 1209: The PCRF returns a bearer setup response message to the packet access unit.

Step 1210: The packet access unit returns an Assignment complete message to the MSC server.

Step 1211: When the called party rings, the UE sends an Alerting message to the MSC server. Step 1212: When the called party answers, the UE sends a Connect message to the MSC server. Step 1213: The MSC server controls the MGW to adjust the bearer to a bidirectionally-on state.

Step 1214: The calling party initiates the operation of tearing down the call, and the Disconnect disconnects and Release messages.

Step 1215: The MSC server controls the MGW to release the bearer.

Step 1216: The MSC server sends a Release (bearer release) message to the packet access unit.

Step 1217: The packet access unit initiates release of the packet access bearer according to the PCRF.

Step 1218: Release the SAE dedicated bearer.

Step 1219: The PCRF returns a bearer release response message to the packet access unit.

Step 1220: The user and the other party interact with the Release complete message, and the call ends. In implementation, in the above process, the packet access unit may be fused to the MSC, that is, through internal interface interaction signaling, which may be regarded as enhancing the MSC to form an enhanced MSC capable of supporting packet access. Then, the interaction between the MSC and the packet access unit given in this embodiment is enhanced.

The internal interaction of the MSC, this internal interaction is no longer limited to the above implementation.

In the implementation, the interaction process shown in step 1201 and step 1202 may not be performed, but the MSC server needs to discover that the UE is accessed through the packet access unit, and the MSC server may be based on the UE. This is found in the location area information, which in turn eliminates steps 1201 and 1202.

In the implementation, if the ATM mode bearer is used between the MGW and the packet access unit, the packet access unit needs to complete the conversion between the UE side IP bearer and the MGW side ATM bearer, which is specifically embodied in step 1206, when the packet access unit receives When the message is assigned, the packet access unit prepares the ATM bearer resource connected to the MGW, and establishes an ATM bearer with the MGW through the ALCAP protocol; and prepares the IP bearer resource connected to the UE side for use with the UE side. IP data transmission.

If the operation of preparing the MGW bearer resource is completed in step 1203 (the MSC server sends a Setup message to the UE), the process of providing the UE with the IP address and port information of the bearer resource allocated by the network side in step 1207 may be performed in the step. Step 1203 is performed without having to use a separate message (such as Information) to provide this information to the UE.

This process can be used for voice or data services in the implementation.

If SAE is changed to GPRS (ie, PCRF is used as PDF and PDN GW is used as GGSN), it is easy to see that the above procedure is also applicable to the case where the GPRS network is a packet access network. Obviously, different embodiments are used to implement different functional entities in different networks. This embodiment is also applicable to CDMA2000 or TD-SCDMA networks.

The same applies to the case where the MSC does not use a separate architecture.

FIG. 13 is a schematic diagram of a call flow of a user's called call when the UE side uses the SIP session mode. In the implementation, if the SIP session mode is used on the UE side, the process can be implemented as shown in FIG.

The key to the process in this embodiment is how to convert the circuit domain call message and the SIP session message. Compared with the process shown in Figure 12, the changes are mainly as follows:

SIP Invite messages are converted to Setu messages;

The SIP 183 message is converted into a Call confirmed message;

The SIP 180 message is converted into an Alerting message;

The SIP 200 OK message is converted into a Connect message;

The Disconnect message is converted into a SIP Bye message;

The Release complete message is converted to a SIP 200 OK message.

A possible PRACK message is omitted from the figure, and the message can be sent by one party that receives the 183 message and the 180 message.

Embodiment 3

FIG. 14 is a schematic diagram of a user service change implementation process. In this embodiment, a UE initiates a service change as an example. When the user has established a call and is talking to the other party, the change of the service may be implemented as follows: Step 1401: The user UE sends a Modify message to the MSC server.

Step 1402: The MSC server changes the bearer to the MGW as required.

Step 1403: The MSC server sends an Modify complete message to the UE. Step 1404: The MSC server instructs the packet access unit to update the bearer.

Step 1405: The packet access unit instructs the PCRF to update the bearer.

Step 1406: The PCRF control performs an update of the packet access bearer.

Step 1407: The PCRF returns a bearer update response to the packet access unit.

Step 1408: The packet access unit returns a bearer operation completion to the MSC server.

In the implementation, step 1403 may be in parallel with step 1404, step 1405, step 1406, step 1407, step 1408, or may be performed after these steps.

This embodiment is also applicable to the processing of network initiated service changes.

In the embodiment, the steps 1405 to 1407 are used to directly modify the packet access bearer, and the old bearer may be deleted first, and then the new bearer may be established according to the requirement of the UE to complete the modification of the bearer.

Embodiment 4

Figure 15 is a schematic diagram of a supplementary service implementation process of the user. In this embodiment, the call-holding service is taken as an example. As shown in the figure, when the user has established a call and is talking to the other party, the implementation of the supplementary service may include the following steps:

Step 151: The user UE sends a HOLD (Call Hold) message to the MSC through the packet access network and the packet access unit.

Step 1502: The MSC returns a HOLD ACKNOWLEDGE message to the UE.

In the implementation, the embodiment uses the message exchange signaling channel between the UE and the MSC established by the packet access unit to transmit the supplementary service related message to implement the supplementary service. The method is also applicable to other supplementary services that require message interaction between the UE and the MSC.

Embodiment 5

FIG. 16 is a schematic diagram of a short message service implementation process of a user. In this embodiment, a case where a short message is sent by a UE is taken as an example. As shown in the figure, the implementation of the short message service may be implemented as follows:

Step 1601: The user UE sends a short message to the MSC through the packet access network and the packet access unit. Ask for news.

Step 1602: The MSC returns a sending result report message to the UE.

This embodiment is also applicable to the case of a short message of a UE terminal.

As can be seen from the above implementation, the embodiment of the present invention performs signaling interaction between the user equipment and the mobile switching center by establishing a signaling channel between the packet access network in the packet domain and the mobile switching center in the circuit domain, thereby enabling the location The users in the packet area are able to perform the signaling interaction required for service establishment with the MSC in the circuit domain.

And the service bearer channel for carrying the service between the user equipment and the mobile switching center is managed to perform the service of the user equipment and the mobile switching center according to the service requirement that the user equipment needs to establish, thereby achieving the use of the packet network coverage to provide the user with each The current service that can be obtained through the circuit domain access method improves the use efficiency of the packet network and the circuit domain core network, and enables users to obtain services from the MSC through the packet network, which is beneficial for the operator to fully utilize the packet network coverage. Users can provide various services that can only be obtained through circuit domain access, which can significantly improve the efficiency of network usage.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above disclosure is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and thus equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims

Rights request

A system for providing services for user equipment, comprising a packet access network, a mobile switching center in a circuit domain, and a user equipment accessing a wireless communication network via a packet access network, and further comprising: packet access a unit, configured to establish a signaling channel between a user equipment in a packet access network and a mobile switching center in a circuit domain;

2. The system for providing a service to a user equipment according to claim 1, wherein the packet access unit further comprises:

a bearer channel management unit, configured to manage a media channel between the user equipment and the mobile switching center according to the requirement of the user equipment to establish a service;

3. The system for providing a service to a user equipment according to claim 2, wherein the loading channel management unit comprises:

a mobile switching center side management module, configured to allocate or reclaim bearer resources on the mobile switching center side, and establish, modify, or release a media channel between the packet data network gateway and the mobile switching center in the packet access network;

The packet access network side management module is configured to establish, modify, or release a media channel between the user equipment and the packet data network gateway in the packet access network.

4. The system for providing a service to a user equipment according to claim 3, wherein the loading channel management unit further comprises:

The bearer conversion module is configured to allocate the same bearer resources as the user equipment side and the mobile switching center side when the bearer access network side is inconsistent with the bearer type of the mobile switching center side media channel, and perform bearer conversion.

The system for providing a service to a user equipment according to claim 1, wherein the group access unit further comprises:

a media negotiating unit, configured to send and receive media description information to and from the user equipment; to send and receive media description information from the mobile switching center.

6. The system for providing a service to a user equipment according to claim 1, wherein the signaling channel between the user equipment and the mobile switching center is via a mobility management entity in the packet access network, or via a packet. Packet data network gateway in the access network.

The system for providing a service to a user equipment according to claim 1, wherein the packet access unit further comprises:

The protocol conversion module is configured to provide a protocol conversion for the user equipment supporting the session initiation protocol to obtain the service from the mobile switching center.

8. A method for providing a service to a user equipment, the method comprising:

And establishing a signaling channel between the packet access network and the mobile switching center in the circuit domain of the user equipment; the user equipment and the mobile switching center transmit the service message by using the signaling channel.

9. The method for providing a service for a user equipment according to claim 8, wherein the signaling channel between the packet access network and the mobile switching center in the circuit domain further passes through a packet access unit.

The method for providing a service for a user equipment according to claim 8 or 9, wherein the user equipment and the mobile switching center send a media negotiation message to the other party via the signaling channel; Modify or release the media channel between the user equipment and the mobile switching center.

11. The method of providing a service for a user equipment according to claim 10, further comprising:

The mobile switching center allocates or modifies the local bearer resources;

The bearer resource address related information is carried in the media negotiation message, and is sent to the user equipment.

12. The method of providing a service for a user equipment according to claim 10, further comprising:

The user equipment carries the bearer resource address related information in the media negotiation message and sends the information to the mobile switching center.

The method for providing a service for a user equipment according to claim 10, wherein the mobile switching center controls the packet access network to establish, modify, or release the user equipment and the mobile according to the media description information in the media negotiation message. Media channel between exchange centers.

The method for providing a service to a user equipment according to claim 10 or 9, wherein the packet access unit controls the packet access network to establish, modify, or release the user according to the media description information in the media negotiation message. Media channel between the device and the mobile switching center.

The method for providing a service to a user equipment according to claim 10 or 9, further comprising:

The packet access unit respectively allocates the bearer resources of the user equipment side and the mobile switching center side; the packet access unit carries the bearer resource address related information of the user equipment side in the media negotiation message, and sends the information to the user equipment, and the mobile switching center side The bearer resource address related information is carried in the media negotiation message and sent to the mobile switching center.

The method for providing a service for a user equipment according to claim 9, wherein the packet access unit and the user equipment send and receive a session initiation protocol message, and the packet access unit and the mobile switching center transmit and receive circuit domain service messages;

The packet access unit converts the session initiation protocol message of the user equipment with the circuit domain service message on the mobile switching center side.

A device for providing a service to a user equipment, the device comprising: a packet access unit, configured to establish a signaling channel between a user equipment in a packet access network and a mobile switching center in a circuit domain;

The user equipment sends a message to the mobile switching center through the signaling channel via a packet access network Make interaction.

The device for providing a service to a user equipment according to claim 17, wherein the device further comprises:

a bearer channel management unit, configured to establish, modify, or release a media channel between the user equipment and the mobile switching center;

The device for providing a service to a user equipment according to claim 18, wherein the bearer channel management unit comprises:

a mobile switching center side management module, configured to establish, modify, or release a media channel between the packet access unit and the mobile switching center;

The packet access network side management module is configured to establish, modify, or release a media channel between the user equipment and the packet access unit.

The device for providing a service to the user equipment according to claim 19, wherein the bearer channel management unit further comprises:

The bearer conversion module is configured to allocate the same bearer resources as the user equipment side and the mobile switching center side when the bearer access network side is different from the bearer type of the mobile switching center side media channel, and perform bearer conversion.

The device for providing a service to a user equipment according to claim 19, wherein the device further comprises:

a media negotiation unit, configured to transmit media description information with the user equipment and the mobile exchange;

The device for providing a service to the user equipment according to claim 21, wherein when the user equipment is calling, the media negotiation unit carries the media description information of the user equipment or itself in a call setup message and sends the message to the call setup message. The mobile switching center transmits the media description information of the mobile switching center or itself to the user equipment in a message of progressing, ringing, and connecting one of the messages; When the called party is called, the media negotiation unit sends the media description information of the mobile switching center or itself to the user equipment in a message of one of call confirmation, ringing, and connection, and describes the user equipment or the media of the user. The information is carried in a call setup, message, notification, device, one of the messages sent to the mobile switching center.

The device for providing a service to a user equipment according to claim 21, wherein the packet access unit is configured to: when receiving a message containing media description information from a user equipment, The media description information is sent to the mobile switching center in the assignment completion message, or the message containing the media description information is sent to the mobile switching center.

The device for providing a service to a user equipment according to claim 18, wherein the device further comprises:

The apparatus for providing a service to a user equipment according to claim 24, wherein the protocol conversion module is configured to: when the service is a call service, perform a session initial protocol session flow and a mobile exchange on a user equipment side. The circuit-side call flow of the central side is converted. When the service is a message service, the protocol conversion module converts the session initial protocol instant message flow on the user equipment side and the circuit domain short message flow on the mobile switching center side.

The apparatus for providing a service to a user equipment according to any one of claims 18 to 25, wherein the apparatus is separately configurable, or is disposed in a packet access network, or is disposed in a mobile switching center. .