WO2014067165A1

WO2014067165A1 - Method, device and system for transmitting session request

Info

Publication number: WO2014067165A1
Application number: PCT/CN2012/084104
Authority: WO
Inventors: 王爽; 乔伟华; 夏旭
Original assignee: 华为技术有限公司
Priority date: 2012-11-05
Filing date: 2012-11-05
Publication date: 2014-05-08
Also published as: CN103931155A

Abstract

The embodiments of the present invention provide a method, device and system for transmitting a session request, and relate to the communications field, so that a Gx session request message and an Rx session request message that carry the same address can be accurately received in the case where an NAT device is configured in a PCRF network, so as to accurately bind the Rx session and Gx session. The method comprises: after receiving a first Gx session request message carrying a UE address, a DRA sending a second Gx session request message carrying a first address to the PCRF, the first address being the UE address or a UE address obtained after NAT conversion; and then the DRA receiving a firsr Rx session request message carrying the UE address obtained after NAT conversion, and sending, when the DRA determines to send a second Rx session request message to the PCRF, the second Rx session request message carrying the first address to the PCRF.

Description

Method, device and system for transmitting session request

The present invention relates to the field of communications, and in particular, to a method and a device system for transmitting a session request.

Background technique

In 3GPP (The 3rd Generation Partnership Project), the core network uses the PCC (Policy Control and Charging) architecture to implement QoS (Quality of Service) control for packet data services. Billing. In the PCC architecture, the PCRF (Policy Control and Charging Rules Function) is based on related entities in the core network, such as PCEF (Policy and Charging Enforcement Function) and AF (Application). The information provided by the function, the application function entity, and the like is used to formulate a suitable PCC rule for the UE (User Equipment), and the PCC rule is sent to the PCEF for execution. The PCRF communicates with the PCEF through a Gx interface. The connection relationship between the PCRF and the PCEF is called a Gx session, and the PCRF and the AF communicate through the Rx interface. The connection relationship between the PCRF and the AF is called an Rx session.

In actual network deployment, multiple PCRFs exist in the same domain, which are responsible for formulating different PCC rules for different user equipments. The PCC rules need to use the information of the same UE transmitted by PCEF and AF. The correctness of the rules needs to ensure that the PCRF can receive Gx sessions and RX sessions sent by the PCEF and AF for the same UE. Currently, the session binding technology is used, and the PCRF can bind the Gx session and the Rx session under the same UE according to the same UE address carried in the received Gx session and the Rx session.

If the network address translation (NAT) device is deployed after the PCEF, the address carried in the Gx session request sent by the PCEF to the PCRF through the DRA (diameter router agent) is XI. . The address carried in the Rx session request sent by the AF to the PCRF by the AF is the address X2 after the NAT, which will cause the PCRF to fail to correctly correct the Rx session and Gx under the UE. Sessions are tied together. Summary of the invention

An embodiment of the present invention provides a method, an apparatus, and a system for transmitting a session request, which can enable a PCRF to correctly receive a Gx session request message and an Rx session request message carrying the same address when the NAT device is deployed in the network. Then correctly bind the Rx session and the Gx session.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

In one aspect, a method for transmitting a session request is provided, including:

The diameter routing agent DRA receives the first Gx session request message, where the first Gx session request message includes the user equipment UE address;

The DRA sends a second Gx session request message to the policy control and charging rule function entity PCRF, where the second Gx session request message includes a first address, the first address is the UE address or a NAT-converted UE address corresponding to the UE address; the DRA receives the first Rx session request message, where the first Rx session request message includes the NAT-transformed UE address;

Determining, by the DRA, a second Rx session request message to the PCRF according to the NAT translated UE address;

The DRA sends the second Rx session request message to the PCRF, where the second Rx session request message includes the first address.

In a first possible implementation, the DRA determines to send a second Rx session request message to the PCRF according to the NAT translated UE address, including:

Determining, by the DRA, the UE address according to the NAT translated UE address; the DRA determining to send the second Rx session request message to the PCRF according to the stored correspondence between the UE address and the PCRF . With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the DRA determines the UE address according to the NAT translated UE address, including: the DRA according to the NAT The converted UE address acquires the UE address from the NAT device. In a third possible implementation, the DRA determines to send a second Rx session request message to the PCRF according to the NAT translated UE address, including:

The DRA determines to send the second Rx session request message to the PCRF according to the stored correspondence between the NAT translated UE address and the PCRF.

With reference to the first aspect, and the third possible implementation manner of the first aspect, in a fourth possible implementation, the DRA acquires the NAT translated UE address from a NAT device according to the UE address;

And the DRA stores the correspondence between the NAT translated UE address and the PCRF according to the stored correspondence between the UE address and the PCRF. With reference to the first aspect, and the first, second, third, and four possible implementation manners of the first aspect, in a fifth possible implementation manner, the Gx session request message is sent by the policy and charging execution entity PCEF, The Rx session request message is sent by the application function entity AF. The UE address is an IP address of the UE, and the NAT-transformed UE address is a NAT-transformed IP address corresponding to the IP address of the UE or a NAT-transformed IP corresponding to the IP address of the UE. Address and port number.

In a second aspect, a diameter routing agent DRA is also provided, including:

a Gx receiving unit, configured to receive a first Gx session request message, where the first Gx session request message includes a user equipment UE address;

a Gx sending unit, configured to send a second Gx session request message to the policy control and charging rule function entity PCRF, where the second Gx session request message includes a first address, where the first address is the UE address or a NAT translated UE address corresponding to the UE address;

An Rx receiving unit, configured to receive a first Rx session request message, where the first Rx session request message includes the NAT translated UE address, and a processing unit, configured to receive, according to the Rx receiving unit, the The NAT converted UE address in the first Rx session request message determines to send a second Rx session request message to the PCRF;

And an Rx sending unit, configured to send a second Rx session request message to the PCRF, where the second Rx session request message includes the first address. In a first possible implementation manner, the processing unit includes: a first processing subunit and a second processing subunit;

The first processing subunit, configured to determine, according to the NAT translated UE address, the UE address;

The second processing sub-unit is configured to determine, according to the stored correspondence between the UE address and the PCRF, the second Rx session request message to be sent to the PCRF.

In a second possible implementation, the first processing sub-unit is specifically configured to acquire the UE address from a NAT device according to the NAT translated UE address.

In a third possible implementation manner, the processing unit includes: a third processing subunit;

And the third processing sub-unit is configured to determine, according to the stored correspondence between the NAT translated UE address and the PCRF, the second Rx session request message to the PCRF.

With reference to the second aspect, and the third possible implementation manner of the second aspect, in a fourth possible implementation, the third processing sub-unit is further configured to acquire the NAT translation from the NAT device according to the UE address The subsequent UE address stores the correspondence between the NAT-converted UE address and the PCRF according to the stored correspondence between the UE address and the PCRF.

With reference to the second aspect and the first, second, third and fourth possible implementation manners of the second aspect, in a fifth possible implementation manner, the Gx session request message is sent by the policy and charging execution entity PCEF, The Rx session request message is sent by the application function entity AF. The UE address is an IP address of the UE, and the NAT-transformed UE address is a NAT-transformed IP address corresponding to the IP address of the UE or a NAT-transformed IP corresponding to the IP address of the UE. Address and port number.

In a third aspect, a diameter routing agent DRA is provided, including: a receiver, a transmitter, a memory, and a processor respectively connected to the receiver, the transmitter, and the memory, the memory storing a set of program codes, The processor invokes program code in the memory for performing the operations provided by the first aspect.

In a fourth aspect, a system is provided, including: user equipment UE, policy, and charging execution Entity PCEF, Diameter Routing Agent DRA, Policy and Charging Rules Function Entity PCRF, Network Address Translation NAT Device, Application Function Entity AF;

The DRA is the foregoing DRA; the NAT device is configured to allocate the NAT-transformed UE address to the UE; the PCEF is configured to send the first Gx session request message to the DRA; The first Rx session request message is sent to the DRA; the PCRF is configured to receive a second Gx session request message and the second Rx session request message sent by the DRA. In a fifth aspect, a method for transmitting a session request is provided, including:

The diameter routing agent DRA receives the first Gx session request message sent by the policy and the charging execution entity PCEF, wherein the first Gx session request message includes a user equipment UE address; the DRA sends a first Gx session response to the PCEF The first Gx session response message carries the first address and the address of the PCRF, where the first address is the UE address or the NAT translated UE address corresponding to the UE address, so that the The PCEF sends a second Gx session request message including the first address to the PCRF; the DRA receives a first Rx session request message sent by the application function entity AF, where the first Rx session request message includes the The NAT-converted UE address; the DRA determines to redirect the first Rx session request to the PCRF according to the NAT translated UE address;

The DRA sends a first Rx session response message to the AF, where the first Rx session response message includes the first address and an address of the PCRF, so that the AF sends the PCRF to the PCRF. The second Rx session request message of the first address.

In a first possible implementation manner, the DRA, according to the NAT translated UE address, determines to redirect the first Rx session request to the PCRF, including:

Determining, by the DRA, the UE address according to the NAT translated UE address; the DRA determining to redirect the first Rx session request to the foregoing according to the stored correspondence between the UE address and the PCRF PCRF.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation, the determining, by the DRA, the UE address according to the NAT translated UE address, including: The DRA acquires the UE address from a NAT device according to the NAT translated UE address.

In a third possible implementation manner, the DRA, according to the NAT translated UE address, determines to redirect the first Rx session request to the PCRF, including:

And determining, by the DRA, to redirect the first Rx session request to the PCRF according to the stored correspondence between the NAT translated UE address and the PCRF. With reference to the fifth aspect, and the third possible implementation manner of the fifth aspect, in a fourth possible implementation, the DRA acquires the NAT translated UE address from a NAT device according to the UE address;

And the DRA stores the correspondence between the NAT translated UE address and the PCRF according to the stored correspondence between the UE address and the PCRF. With reference to the fifth aspect and the first, second, third and fourth possible implementation manners of the fifth aspect, in a fifth possible implementation manner, the UE address is an IP address of the UE, and the NAT converted UE The address is a NAT-transformed IP address corresponding to the IP address of the UE or a NAT-converted IP address and port number corresponding to the IP address of the UE.

In a sixth aspect, a diameter routing agent DRA is also provided, including:

a Gx receiving unit, configured to receive a first Gx session request message sent by the policy and the charging execution entity PCEF, where the first Gx session request message includes a UE address;

a Gx sending unit, configured to send a first Gx session response message to the PCEF, where the first Gx session response message carries an address of a first address and a PCRF, where the first address is the UE address or Determining, by the UE address, the NAT translated UE address, so that the PCEF sends a second Gx session request message including the first address to the PCRF;

An Rx receiving unit, configured to receive a first Rx session request message sent by the application function entity AF, where the first Rx session request message includes the NAT translated UE address, and a processing unit, configured to perform, according to the NAT conversion The subsequent UE address determines to redirect the first Rx session request to the PCRF;

An Rx sending unit, configured to send a first Rx session response message to the AF, where the An Rx Session Response message includes the first address and an address of the PCRF to cause the AF to send a second Rx Session Request message including the first address to the PCRF.

In a first possible implementation manner, the processing unit includes: a first processing subunit and a second processing subunit;

The second processing sub-unit is configured to determine to redirect the first Rx session request to the P C RF according to the stored correspondence between the UE address and the PCRF.

The third processing sub-unit is configured to determine to redirect the first Rx session request to the PCRF according to the stored correspondence between the NAT translated UE address and the PCRF. With reference to the fourth aspect, and the third possible implementation manner of the fourth aspect, in a fourth possible implementation, the third processing sub-unit is further configured to acquire, by the NAT device, according to the received UE address The NAT-converted UE address is used to store the correspondence between the NAT-converted UE address and the PCRF according to the stored correspondence between the UE address and the PCRF.

With reference to the sixth aspect, and the first, second, third, and fourth possible implementation manners of the sixth aspect, in a fifth possible implementation manner, the UE address is an IP address of the UE, and the NAT converted UE The address is a NAT-transformed IP address corresponding to the IP address of the UE or a NAT-converted IP address and port number corresponding to the IP address of the UE. In a seventh aspect, a diameter routing agent DRA is provided, including: a receiver, a transmitter, a memory, and a processor respectively connected to the receiver, the transmitter, and the memory, the memory storing a set of program codes, The processor invokes program code in the memory for performing the operations provided by the fifth aspect. In an eighth aspect, a system is provided, including: user equipment UE, policy, and charging execution Entity PCEF, Diameter Routing Agent DRA, Policy and Charging Rules Function Entity PCRF, Network Address Translation NAT Device, Application Function Entity AF;

The DRA is the DRA of the sixth aspect; the NAT device is configured to allocate the NAT-transformed UE address to the UE; and the PCEF is configured to send the first Gx session request message to the DRA. Receiving, by the DRA, the first Gx session response message; the AF is configured to send the first Rx session request message to the DRA, and receive the first Rx session response message from the DRA; The PCRF is configured to receive a second Gx session request message that is sent by the PCEF and that includes the first address, and a second Rx session request message that is sent by the AF and that includes the first address.

The GX session request message carrying the first address and the Rx session request message carrying the first address are sent to the PCRF by the DRA, so that the PCRF receives the Gx. After the session request message and the Rx session request message, the Rx session is correctly bound to the Gx session according to the first address carried by the session request message. Or sending, by the DRA, the response message carrying the first address and the PCRF address to the PCEF and the AF, respectively, so that the PCEF sends the Gx session request message carrying the first address to the PCRF, so that the AF will carry The Rx session request message with the first address is sent to the PCRF, so that after receiving the Gx session request message and the Rx session request message, the PCRF correctly binds the Rx session to the Gx session according to the first address carried by the PCRF. Together.

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 creative work. Figure 1 is a schematic diagram of actual network deployment under the PCC architecture;

2 is a schematic flowchart of a method for transmitting a session request according to Embodiment 1; 3 is a structural block diagram of a DRA provided in Embodiment 1; FIG. 4 is a structural block diagram of another DRA provided in Embodiment 1;

5 is a structural block diagram of another DRA provided in Embodiment 1;

6 is a structural block diagram of another DRA provided by Embodiment 1. FIG. 7 is a schematic diagram of a communication flow of a system for transmitting a session request according to Embodiment 1. FIG. 8 is another transmission session request provided by Embodiment 1. Schematic diagram of the communication process of the system;

9 is a schematic flowchart of a method for transmitting a session request according to Embodiment 2; FIG. 10 is a structural block diagram of a DRA provided in Embodiment 2;

FIG. 11 is a structural block diagram of another DRA provided in Embodiment 2; FIG. 12 is a structural block diagram of another DRA provided in Embodiment 2;

13 is a structural block diagram of another DRA provided by Embodiment 2. FIG. 14 is a schematic diagram showing a communication flow of a system for transmitting a session request according to Embodiment 2.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. As shown in FIG. 1 , the actual network deployment is performed. Optionally, the session binding process in the prior art is: the PCEF 15 allocates a message to the UE 14 after receiving the IP-CAN session establishment request message by the UE 14 . IP address XI, establish an IP-CAN session. At the same time, the PCEF 15 provides the DRA 13 with the information such as the IP address of the UE 14 so that the DRA 13 selects a PCRF, such as the PCRF1, and sends a Gx session request message to the selected PCRF1, and after the PCRF1 returns a response message indicating that the request is successful, the Gx session is established. The DRA 13 stores the correspondence between the IP address of the UE 14 and the PCRFl address. Thereafter, when the AF17 request establishes an Rx session with the PCRF under the DRA 13, the DRA 13 selects the IP address of the UE 14 to be carried as XI. The Rx session request of the AF, and forwards the Rx session request of the AF to the PCRF11 corresponding to the IP address, so that the PCRF11 establishes the Rx session, and binds to the Gx session of the established UE whose IP address is XI. together. In the actual network, when the NAT device 16 is deployed after the PCEF15, the address carried in the Rx session request message sent by the AF17 to the DRA is the address X2 after the NAT translation, and the method provided by the embodiment of the present invention needs to be applied. And the device, that the Gx session request message and the Rx session request message received by the PCRF for the same UE carry the same address. In the embodiment of the present invention, the DRA is logically a Diameter node that implements the Diameter protocol proxy function. There are two forms, one is a proxy DRA, and the proxy DRA is used to forward the PCEF and the AF and the corresponding PCRF. The communication service information; the other is to redirect the DRA, the redirect DRA is used to direct the PCRF for the PCEF and the AF, and ensure that the PCEF and AF send communication service information to the correct PCRF. Embodiment 1 The embodiment of the present invention provides a method for transmitting a session request, where the method is applied to a proxy DRA. As shown in FIG. 2, the method includes the following steps:

201. The diameter routing proxy DRA receives the first Gx session request message, where the first Gx session request message includes a user equipment UE address.

After the UE is connected to the network, the IP-CAN session request is initiated. After receiving the IP-CAN session establishment request initiated by the UE, the PCEF allocates an IP address to the UE, and the IP address is called in the embodiment of the present invention. UE address. The UE obtains the IP address, and then establishes an IP-CAN session.

After the PCEF allocates an IP address to the UE, the DRA sends a first Gx session request message carrying the UE address, and the DRA receives the first Gx session request message carrying the UE address.

202. The DRA sends a second Gx session request message to the policy control and charging rule function entity PCRF, where the second Gx session request message includes a first address of the UE, where the first address may be The UE address or a NAT-converted UE address corresponding to the UE address.

After receiving the first Gx session request message carrying the UE address, the DRA selects one of the PCRFs under the DRA management according to the first Gx session request message. Corresponding PCRF. The corresponding relationship between the UE address and the selected PCRF may be stored in the DRA, for example, the correspondence between the UE address and the PCRF address is stored. The NAT device in the network system can perform address translation on the UE address carried in the received service data of the UE. In the embodiment of the present invention, when the service data of the UE is transmitted to the NAT device through the PCEF, the user service information of the carried UE is the UE address, and the NAT device receives the service data of the UE. The UE address carried by the address is then translated. The translated address is called the NAT translated UE address. The user service information of the UE carried in the service data transmitted to the other device, such as the AF, by the NAT device is the NAT translated UE address. In the embodiment of the present invention, the UE address is an IP address of the UE, and the NAT-transformed UE address is a NAT-transformed IP address corresponding to the IP address of the UE or is an IP address with the UE. Corresponding NAT-converted IP address and port number The NAT device may store a correspondence between the UE address and the NAT-converted UE address. In a case that the first address included in the second Gx session request message sent by the DRA to the PCRF is the NAT translated UE address, the DRA may perform the following steps A1 and A2 to store the NAT after the NAT translation. Correspondence between the UE address and the PCRF:

A1. The DRA acquires the NAT translated UE address from the NAT device according to the UE address. The DRA may send an address query request carrying a UE address to the NAT device. After receiving the address query request, the NAT device queries and returns a NAT-converted UE address corresponding to the UE address to the DRA.

A2: The DRA stores a correspondence between the NAT-converted UE address and the PCRF according to the stored correspondence between the UE address and the PCRF.

In the case that the first address included in the second Gx session request message is the UE address, the steps A1 and A2 may not be performed, and the DRA may directly forward the second Gx including the UE address to the PCRF. Session request message. After receiving the second Gx session request message, the PCRF may send a response message of the second Gx session request message to the PCEF by using the DRA, and the Gx session is established. The PCEF and the PCRF may perform a Gx session through the DRA. When the Gx session is performed, the user service information of the UE carried in the Gx session data is the First address.

203. The DRA receives a first Rx session request message, where the first Rx session request message includes the NAT translated UE address.

After the UE accesses the network and allocates the address to the UE, the UE performs a SIP (Session Initiation Protocol) registration (Register), and the UE passes through the NAT device when registering with the AF, so the AF receives the UE. The user service information carried in the registration request may be the NAT translated UE address converted by the NAT device. The user service information carried in the first Rx session request message sent by the AF may be the NAT translated UE address when the AF is requested to perform the Rx session to provide the UEF with the user service information of the UE.

204. The DRA determines to send a second Rx session request message to the PCRF according to the NAT translated UE address.

When the step 204 is performed, if the DRA has performed the steps A1 and A2, the mapping between the NAT-converted UE address and the PCRF is already stored in the DRA, and the DRA may be directly based on the DRA. The correspondence determines that the second Rx session request message is sent to the PCRF.

If the DRA does not perform steps A 1 and A2, the DRA may perform the following steps B1 and B2 to determine to send a second Rx session request message to the PCRF according to the NAT translated UE address.

B1. The DRA determines the UE address according to the NAT translated UE address. The DRA may acquire the UE address from the NAT device according to the NAT translated UE address. The DRA may send an address query request carrying the NAT-transformed UE address to the NAT device, and the NAT device may query and return the UE address to the DRA after receiving the address query request.

B2. The DRA determines to send the second Rx session request message to the PCRF according to the stored correspondence between the UE address and the PCRF.

The DRA may determine to send the second Rx session request message to the PCRF according to the already stored relationship between the UE address and the PCRF and the UE address corresponding to the NAT translated UE address. 205. The DRA sends the second Rx session request message to the PCRF, where the second Rx session request message includes the first address. The DRA determines to send the second Rx session request message to the PCRF, and sends a second Rx session request message carrying the first address to the PCRF.

After receiving the second Rx session request message carrying the first address, the PCRF sends a response message of the second Rx session request message to the AF through the DRA to establish an Rx session. The PCEF and the PCRF may perform an Rx session through the DRA. When the Rx session is performed, the user service information of the UE carried in the data is the first address. In this way, the PCRF associates the Gx session carrying the same first address with the Rx session, which ensures that the PCRF receives the information about the same UE provided by the PCEF and the AF, thereby ensuring the PCRF. Choose the correct PCC rules.

Of course, any DRA can modify its own properties to proxy DRA to perform the steps described in the above method. A method for transmitting a session request is provided by the embodiment of the present invention, and the Gx session request message and the Rx session request message carrying the same first address are sent to the PCRF by using the DRA, so that the PCRF will perform the Gx session under the same UE. Bind with the Rx session to select the correct PCC rules. The embodiment of the present invention further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments, which is applied to the DRA. As shown in FIG. 3, an apparatus for transmitting a session request according to an embodiment of the present invention includes: a Gx receiving unit 301, a Gx sending unit 302, an Rx receiving unit 303, a processing unit 304, and an Rx sending unit 305.

The Gx receiving unit 301 is configured to receive a first Gx session request message, where the first Gx session request message includes a user equipment UE address. The UE address is an IP address of the UE, or the UE address is an IP address of the UE and a port number of the UE.

The Gx sending unit 302 is configured to send a second Gx session request message to the policy control and charging rule function entity PCRF, where the second Gx session request message includes a first address, where the first address is the UE address Or a NAT-converted UE address corresponding to the UE address. The UE address may be an IP address of the UE, and the NAT-transformed UE address is a NAT-transformed IP address corresponding to the IP address of the UE; or The address may be an IP address of the UE and a port number of the UE or a NAT-translated IP address and port number corresponding to the IP address of the UE.

After the Gx receiving unit 301 of the DRA receives the first Gx session request message carrying the UE address, the processing unit 304 of the DRA may use the first Gx session request message in several PCRFs under the DRA management. Select a corresponding PCRF. The DRA may store a correspondence between the UE address and a PCRF address, for example, may be stored in the processing unit 304 or the Gx transmitting unit 302.

The Rx receiving unit 303 is configured to receive the first Rx session request cancellation, where the first Rx session request message includes the NAT translated UE address.

The processing unit 304 is configured to determine, according to the NAT translated UE address in the first Rx session request message received by the Rx receiving unit, to send a second Rx session request message to the PCRF.

The Rx sending unit 305 is configured to send the second Rx session request message to the PCRF, where the second Rx session request message includes the first address.

As shown in FIG. 4, the processing unit 304 may include: a first processing subunit 3041 and a second processing subunit 3042; the first processing subunit 3041, configured to determine, according to the NAT translated UE address The second processing sub-unit 3042 is configured to determine to send the second Rx session request message to the PCRF according to the stored correspondence between the UE address and the PCRF. The first processing sub-unit 3041 may be specifically configured to acquire the UE address from the NAT device according to the NAT translated UE address.

Alternatively, as shown in FIG. 5, the processing unit 304 may include: a third processing sub-unit 3043; the third processing sub-unit 3043, configured to: according to the stored NAT translated UE address and the PCRF Correspondingly, determining to send the second Rx session request message to the PCRF. The third processing sub-unit is further configured to acquire the NAT-transformed UE address from the NAT device according to the UE address, and store the NAT after the mapping according to the stored correspondence between the UE address and the PCRF. Correspondence between the UE address and the PCRF.

In hardware implementation, the above various sending units may be transmitters or transceivers, and the above various receiving units may be receivers or transceivers, and the sending unit and the receiving unit may be integrated to form a transceiver unit, corresponding to hardware implementation. For the transceiver. The above processing unit can The hardware form or software form is embedded in the processor of the base station. The processor can be a central processing unit or a single chip microcomputer.

FIG. 6 is a schematic structural diagram of an apparatus for transmitting a session request according to an embodiment of the present invention. The device can be implemented on the DRA. The apparatus includes a transmitter 61, a receiver 62, a memory 63, and a processor 64 coupled to the transmitter 61, the receiver 62, and the memory 63, respectively. Of course, the DRA may also include a common component such as an antenna, an input/output device, and the like, and the embodiment of the present invention is not limited herein.

The memory 63 stores a set of program codes, and the processor 64 is configured to call the program code stored in the memory 63 for performing the following operations:

The processor 64 receives the first Gx session request message by the receiver 62, where the first Gx session request message includes a UE address; the processor 64 sends a second Gx session request message to the PCRF through the transmitter 61, The second Gx session request message includes a first address of the UE, and the first address is the UE address or a NAT translated UE address corresponding to the UE address. The UE address is an IP address of the UE, and the NAT-transformed UE address is a NAT-transformed IP address corresponding to the IP address of the UE or a NAT-transformed IP corresponding to the IP address of the UE. Address and port number.

After the receiver 62 of the DRA receives the first Gx session request message carrying the UE address, the processor 64 of the DRA selects among several PCRFs under the DRA management according to the first Gx session request message. A corresponding PCRF. The processor 64 of the DRA may store a correspondence between the UE address and a PCRF address. The transmitter 61 of the DRA sends a second Gx session request message to the PCRF.

The processor 64 receives the first Rx session request message by the receiver 62, where the first Rx session request message includes the NAT translated UE address; the processor 64 is configured according to the NAT converted UE. The address determination sends a second Rx session request message to the PCRF; and sends the second Rx session request message to the PCRF by using the transmitter 61, where the second Rx session request message includes the first address.

The determining, by the processor, the sending, by the UE, the second Rx session request message to the PCRF according to the NAT translated UE address may include:

The processor 64 determines the UE address according to the NAT translated UE address; the processor 64 determines, according to the stored correspondence between the UE address and the PCRF, Sending the second Rx session request message to the PCRF. The determining, by the processor, the UE address, according to the NAT translated UE address, may include:

The processor 64 acquires the UE address from the NAT device according to the NAT translated UE address. Or the determining, by the processor 64, the sending, by the NAT, the second Rx session request message to the PCRF according to the NAT translated UE address, the processor 64: the processor 64 according to the stored NAT translated UE address and the Corresponding relationship of the PCRF, determining to send a second Rx session request message to the PCRF. The processor 64 may acquire the NAT-converted UE address from the NAT device according to the UE address, and store the NAT-transformed UE address and location according to the stored correspondence between the UE address and the PCRF. The correspondence between PCRFs. The foregoing first Gx session request message may be sent by the PCEF, and the first Rx session request message may be sent by the AF. The embodiment of the present invention further provides a system for transmitting a session request. As shown in FIG. 7, the system includes UE71, PCEF72, DRA73, PCRF74, NAT device 75, and AF76. The DRA 73 is the DRA described in the foregoing embodiment shown in FIG. 3 to FIG. 6; the NAT device 75 is configured to allocate the NAT-transformed UE address to the UE 71; The DRA 73 sends a first Gx session request message; the AF 76 is configured to send a first Rx session request message to the DRA 73; the PCRF 74 is configured to receive the second Gx session request that is sent by the DRA 73 and includes the first address And a message and a second Rx session request message including the first address.

Specifically, the communication process between the devices may include the following steps:

701. The PCEF 72 assigns the UE address to the UE 71.

After the UE 71 is attached to the network, the IP-CAN session request is initiated. After receiving the IP-CAN session establishment request initiated by the UE, the PCEF 72 allocates an IP address to the UE. The IP address is referred to as a UE address in the embodiment of the present invention. For example, the PCEF allocates an IP address XI to the UE. The UE obtains the assigned address and establishes an IP-CAN session.

702. The PCEF 72 sends a first Gx session request message to the DRA 73. After the IP address is assigned to the UE 71, the PCEF 72 initiates a Gx session establishment request, and sends a first Gx session request message to the DRA 73. The first Gx session request message carries the UE address.

703, DRA73 select PCRF.

The DRA 73 selects a PCRF 74 in the domain in which the DRA is located according to the UE address XI carried in the received first Gx session request message. The DRA 73 can store the correspondence between the address of the PCRF 74 (e.g., F1) and the UE address. The correspondence between the stored PCRF and the UE address is achieved by storing the correspondence between the address of the PCRF 74 and the UE address. Optionally, steps 704-706 can be performed at this time.

704. The DRA 73 sends an address query request to the NAT device 75.

The DRA 73 sends an address query request to the NAT device 75, which carries the UE address, such as XI.

705. The NAT device 75 queries and returns a NAT translated UE address corresponding to the UE address.

The NAT device 75 can perform address translation on the address of the UE carried in the received service data of the UE. When the service data of the UE is transmitted to the NAT device 75 through the PCEF, the user service information of the carried UE is the UE address, and after receiving the service data of the UE, the NAT device 75 will The carried UE address is used for address translation, and the translated address is called a NAT translated UE address. The NAT device 75 can query and return the NAT-converted UE address corresponding to the UE address to the DRA 73 according to the UE address in the received address query request. For example, the UE address XI corresponding to the NAT converted UE address is the IP address Y1, or the IP address Y1 and the port number P l.

706. The DRA 73 establishes a binding relationship.

After receiving the NAT-converted UE address returned by the NAT device 75, the DRA 73 establishes a binding of the address of the PCRF 74, the UE address, and the NAT-converted UE address according to the NAT-transformed UE address. Relationship (ie correspondence). For example, the correspondence between F 1, XI, and Y1, or the correspondence between Fl, XI, and (Yl, P1).

707. The DRA 73 sends a second Gx session request message to the PCRF 74, and the PCRF 74 returns. The second Gx session response message.

The DRA 73 sends a second Gx session request message carrying the first address to the PCRF 74, where the first address is the UE address or a NAT-converted UE address corresponding to the UE address. After receiving the second Gx session request message, the PCRF 74 returns a response message of the second Gx session request message to the DRA 73. If the steps 704 to 707 are performed, the first address carried in the second Gx session request message sent by the DRA 73 to the PCRF 74 may be a UE address or a NAT-converted UE corresponding to the UE address. The address, if the steps 704 to 707 are not performed, the first address carried in the second Gx session request message sent by the DRA 73 to the PCRF 74 is the UE address.

708. The DRA 73 sends the first Gx session response message to the PCEF.

After receiving the second Gx session response message, the DRA 73 sends a first Gx session response message to the PCEF 72. At this point, the Gx session is established. The PCEF 72 and the PCRF 74 may perform a Gx session through the DRA 73. When the Gx session is performed, the user service information of the UE 71 carried in the data is the first address.

709. The UE 71 performs information registration on the AF76.

The UE accesses the network, and after the UE is allocated to the UE, the SIP is registered with the AF 76, and the UE passes the NAT device when registering with the AF, so the user service information of the UE registered in the AF is as described above. NAT translated NAT address after NAT conversion.

710. The AF 76 sends a first Rx session request message to the DRA 73.

The AF 76 sends a first Rx session request message to the DRA 73 when the user requests the RX session to provide the UEF with the user service information of the UE, where the first Rx session request message carries the NAT translated UE address. .

71 1. The DRA 73 determines to send a second Rx Session Request message to the PCRF 74.

After the DRA 73 receives the first Rx session request message sent by the AF 76, if the DRA 73 performs steps 704 706 to 706, the mapping between the NAT translated UE address and the PCRF is already stored in the DRA. At this time, the DRA 73 may determine, according to the correspondence, that the second Rx session request message is sent to the PCRF, where the second Rx session request message carries the first address.

If the DRA 73 does not perform steps 704-706, steps 71a and 71 lb may be performed to enable the DRA 73 to determine the PCRF 74 according to the NAT translated UE address. Sending the second R x session request message:

71 1a, DRA73 obtains the UE address from NAT75.

The DRA 73 acquires the UE address from the NAT device 75 according to the NAT translated UE address. The DRA 73 may send an address query request carrying the NAT-converted UE address to the NAT device 75, and the NAT device 75 may query and return the UE address to the DRA 73 after receiving the address query request.

71 1b, the DRA 73 establishes a binding relationship.

After receiving the UE address returned by the NAT device 75, the DRA 73 establishes a binding relationship between the address of the PCRF, the UE address, and the NAT-converted UE address. The address of the PCRF is the address of the corresponding PCRF 74 selected by the DRA for the UE according to the first Gx session request message carrying the UE address.

712. The DRA 73 sends a second Rx session request message carrying the first address to the PCRF 74, and the PCRF 74 returns a second Rx session response message to the DRA 73.

713. The DRA 73 sends a first Rx session response message to the AF76.

The DRA 73 sends a first Rx session response message to the AF 76, and the Rx session is established.

714. The PCRF 74 binds the Gx session to the Rx session.

The PCRF 74 establishes a Gx session with the PCEF 72, and after establishing an Rx session with the AF 76, binds the Gx session to the Rx session.

Optionally, any other attribute DRA can automatically modify its own attributes to proxy DRA. As shown in Figure 8, add step 888:

888: The DRA automatically modifies its own attributes to the proxy DRA. The execution of step 888 is not limited to that shown in FIG. 8 after step 706, before 707. In fact, when the DRA learns the existence of the NAT device 75 by acquiring configuration data or performing message interaction with other network elements, the attribute modification can be performed. When processing the Gx session request message, when the attribute of the DRA is the proxy DRA, the DRA can process the received Gx session request message and send it to the PCRF. The remaining steps are the same as in FIG. Method, device and system for transmitting session request provided by embodiment of the present invention, by DRA The Gx session request message and the Rx session request message carrying the same first address are sent to the PCRF, so that the PCRF binds the Gx session and the Rx session under the same UE, and then selects the correct PCC rule.

Embodiment 2 This embodiment of the present invention provides a method for transmitting a session request. As shown in FIG. 9, the method includes the following steps:

901. The diameter routing agent DRA receives the first Gx session request message sent by the policy and charging execution entity PCEF, where the first Gx session request message includes the user equipment UE address.

After the UE is connected to the network, the IP-CAN session request is initiated. After receiving the IP-CAN session establishment request initiated by the UE, the PCEF allocates an IP address to the UE, and the IP address is called in the embodiment of the present invention. UE address. The IP address can be an IP address that is visible on the network. The UE obtains the UE address, and then establishes an IP-CAN session.

After the PCEF allocates the UE address to the UE, the DRA sends a first Gx session request message carrying the UE address, and the DRA receives the first Gx session request message carrying the UE address.

902. The DRA sends a first Gx session response message to the PCEF, where the first Gx session response message carries an address of a first address and a PCRF, where the first address includes the UE address or The NAT-transformed UE address corresponding to the UE address, so that the PCEF sends a second Gx session request message including the first address to the PCRF. After receiving the first Gx session request message carrying the UE address, the DRA selects a corresponding PCRF among the plurality of PCRFs managed by the DRA according to the first Gx session request message. A correspondence between the UE address and the selected PCRF may be stored in the DRA, for example, a correspondence between the UE address and the PCRF address is stored.

The NAT device in the network system can perform address translation on the address of the UE carried in the service data of the received UE. In the embodiment of the present invention, when the service data of the UE is transmitted to the NAT device through the PCEF, the user service information of the carried UE is the UE address, and the NAT device receives the service data of the UE. The UE address carried by the address is then translated. The translated address is called the NAT translated UE address. After the NAT device transmits the user industry of the UE carried in the service data of other devices such as the AF The service information is the UE address after NAT conversion. In the embodiment of the present invention, if the UE address is an IP address of the UE, the NAT-transformed UE address is a NAT-transformed IP address corresponding to the IP address of the UE or is related to the UE. IP address and port number after NAT translation corresponding to the IP address. The NAT device may store a correspondence between the UE address and the NAT-converted UE address. In a case that the first address included in the first Gx session response message sent by the DRA to the PCEF is the NAT translated UE address corresponding to the UE address, the DRA may perform the following steps C1 and C2. The correspondence between the NAT address and the PCRF is stored:

C1. The DRA obtains the NAT converted UE address obtained from the NAT device according to the UE address. The DRA may send an address query request carrying a UE address to the NAT device. After receiving the address query request, the NAT device queries and returns a NAT-converted UE address corresponding to the UE address to the DRA.

C2: The DRA stores a correspondence between the NAT translated UE address and the PCRF according to the stored correspondence between the UE address and the PCRF. In a case that the first address included in the first Gx session response message sent by the DRA to the PCEF is the UE address, the steps C1 and C2 may not be performed, and the DRA may directly send to the PCEF. A first Gx session response message including the first address.

After receiving the first Gx session response message, the PCEF directly sends a second Gx session request message including the first address to the PCRF, where the PCRF receives the second Gx session request message. A response message will be returned to the PCEF. At this point, the Gx session is established. The PCEF and the PCRF may not have to make a Gx session through the DRA. When the Gx session is performed, the user service information of the UE carried in the data is the first address.

903. The DRA receives a first Rx session request message sent by the application function entity AF, where the first Rx session request message includes the NAT translated UE address.

After the UE accesses the network, after the IP address is allocated, the UE registers with the AF, and the UE passes through the NAT device when registering with the AF, so the UE received by the AF The user service information carried in the registration message is the NAT translated UE address converted by the NAT device. The user service information carried in the first Rx session request message sent to the DRA is the NAT translated UE address when the AF is requested to perform the Rx session to provide the PCRF with the user service information of the UE.

904. The DRA determines to redirect the first Rx session request message to the PCRF according to the NAT translated UE address.

When the step 904 is performed, if the DRA has performed the steps C1 and C2, the corresponding relationship between the NAT-converted UE address and the PCRF is already stored in the DRA, and the DRA may be directly based on the DRA. The correspondence, redirecting the first Rx session request message to the PCRF, that is, the final recipient of the Rx session request message for the UE is the PCRF. If the DRA does not perform steps C1 and C2 when performing step 902, the DRA may perform the following steps D1 and D2 to redirect the Rx session request to the PCRF according to the NAT translated UE address. .

D1. The DRA determines the UE address according to the NAT translated UE address. Optionally, the DRA obtains the UE address from the NAT device according to the NAT translated UE address. The DRA may send an address query request carrying the NAT-converted UE address to the NAT device, and the NAT device may query and return the UE address to the DRA after receiving the address query request.

D2. The DRA determines to redirect the first Rx session request message to the P CRF according to the stored correspondence between the UE address and the PCRF.

The DRA redirects the first Rx session request message to the PCRF according to the stored correspondence between the UE address and the PCRF and the UE address corresponding to the NAT translated UE address, that is, the The ultimate recipient of the UE's Rx Session Request message is the PCRF.

905. The DRA sends a first Rx session response message to the AF, where the first Rx session response message includes the first address and an address of the PCRF, so that the AF sends the PCRF to the PCRF. The second Rx session request message of the first address. Determining, by the DRA, that an Rx Session Request message for the UE is redirected to the After the PCRF, the first Rx session response message carrying the first address and the address of the PCRF is sent to the PCEF.

After receiving the first Rx session response message, the AF directly sends a second Rx session request message including the first address to the PCRF, where the PCRF receives the first address carrying the first address. After the second Rx session request message, the response message of the second Rx session request message is sent to the AF by the DRA, and an Rx session is established. The AF and the PCRF may directly perform an Rx session without going through the DRA. When the Rx session is performed, the user service information of the UE carried in the data is the first address. In this way, the PCRF associates the Gx session carrying the same first address with the Rx session, which ensures that the PCRF receives the information about the same UE provided by the PCEF and the AF, thereby ensuring the PCRF. Choose the correct PCC rules. The method for transmitting a session request according to the embodiment of the present invention, the first Gx session response message carrying the same first address and the PCRF address and the first Rx session response message are respectively sent to the AF and the PCEF by using the DRA, so that the The AF and the PCEF respectively send a second Gx session request message and a second Rx session request message carrying the same first address to the PCRF, so that the PCRF binds the Gx session and the Rx session under the same UE. Determine, and then choose the correct PCC rules. The embodiment of the present invention further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments, which is applied to the DRA. As shown in FIG. 10, an apparatus for transmitting a session request according to an embodiment of the present invention may be implemented on a DRA. The apparatus includes: a Gx receiving unit 1001, a Gx transmitting unit 1002, an Rx receiving unit 1003, a processing unit 1004, and an Rx transmitting unit 1005.

The Gx receiving unit 1001 is configured to receive a first Gx session request message sent by the policy and charging execution entity PCEF, where the first Gx session request message includes a UE address.

The Gx sending unit 1002 is configured to send a first Gx session response message to the PCEF, where the first Gx session response message carries an address of a first address and a PCRF, where the first address is the UE address or The NAT-transformed UE address corresponding to the UE address, so that the PCEF sends a second Gx session request message including the first address to the PCRF.

The UE address is an IP address of the UE, and the NAT translated UE address is The NAT-transformed IP address corresponding to the IP address of the UE or the NAT-transformed IP address and port number corresponding to the IP address of the UE. After the Gx receiving unit 1001 of the DRA receives the first Gx session request message carrying the UE address, the processing unit 1004 of the DRA may use the first Gx session request message in several PCRFs under the DRA management. Select a corresponding PCRF. The DRA may store a correspondence between the UE address and a PCRF address, for example, may be stored in the processing unit 1004 or the Gx session sending unit 1002.

The Rx receiving unit 1003 is configured to receive a first Rx session request message sent by the application function entity AF, where the first Rx session request message includes the NAT translated UE address.

The processing unit 1004 is configured to determine to redirect the first Rx session request to the PCRF according to the NAT translated UE address in the first Rx session request message received by the Rx receiving unit.

The Rx sending unit 1005 is configured to send a first Rx session response message to the AF, where the first Rx session response message includes the first address and an address of the PCRF, so that the AF is sent to the PCRF Sending a second Rx session request message including the first address.

As shown in FIG. 11, the processing unit 1004 may include: a first processing sub-unit 1041 and a second processing sub-unit 1042; the first processing sub-unit 1041, configured to perform, according to the NAT translated UE address Determining the UE address; the second processing sub-unit 1042, configured to determine to redirect the first Rx session request message to the PCRF according to the stored correspondence between the UE address and the PCRF. The first processing sub-unit 1041 may be configured to obtain the UE address from a NAT device according to the NAT translated UE address.

Alternatively, as shown in FIG. 12, the processing unit 1004 may include: a third processing subunit 1043; the third processing subunit 1043, configured to: according to the stored NAT translated UE address and the PCRF Correspondingly, determining to redirect the first Rx session request message to the PCRF. The third processing sub-unit 1043 is further configured to acquire the UE address from the NAT device according to the received UE address, and store the NAT after the mapping according to the stored correspondence between the UE address and the PCRF. Correspondence between the UE address and the PCRF.

In hardware implementation, the above various transmitting units may be transmitters or transceivers, The receiving unit may be a receiver or a transceiver, and the transmitting unit and the receiving unit may be integrated to form a transceiver unit, which is implemented as a transceiver corresponding to hardware. The above processing unit may be embedded in the processor of the base station in hardware or software. The processor can be a central processing unit or a single chip microcomputer. FIG. 13 is a schematic structural diagram of an apparatus for transmitting a session request according to an embodiment of the present invention. The device can be implemented on the DRA. The apparatus includes a transmitter 131, a receiver 132, a memory 133, and a processor 134 coupled to the transmitter 131, the receiver 132, and the memory 133, respectively. Of course, the DRA may also include a common component such as an antenna, an input/output device, and the like, and the embodiment of the present invention is not limited herein. The memory 133 stores a set of program codes, and the processor 134 is configured to call the program code stored in the memory 133 for performing the following operations: The processor 134 receives the first Gx session request message through the receiver 132, where The first Gx session request message includes a UE address, and the processor 134 sends a first Gx session response message to the PCEF by using the transmitter 131, where the first Gx session response message carries the first address and the PCRF. Address, the first address is the UE address or a NAT-converted UE address corresponding to the UE address, so that the PCEF sends a second Gx session request including the first address to the PCRF. Message. The UE address is an IP address of the UE, and the NAT-transformed UE address is a NAT-transformed IP address corresponding to the IP address of the UE or a NAT-transformed IP corresponding to the IP address of the UE. Address and port number. After the receiver 132 of the DRA receives the first Gx session request message carrying the UE address, the processor 134 of the DRA selects among the PCRFs under the DRA management according to the first Gx session request message. A corresponding PCRF. The processor 134 of the DRA may store a correspondence between the UE address and a PCRF address. The transmitter 131 of the DRA sends a first Gx session response message to the PCEF. The processor 134 receives the first Rx session request message by the receiver 132, where the first Rx session request message includes the NAT translated UE address; the processor 134 is configured according to the NAT converted UE. The address determination redirects the first Rx session request message to the PCRF; and sends, by the transmitter 131, a first Rx session response message to the AF, where the first Rx session response message includes the An address and an address of the PCRF, such that the AF sends a second Rx Session Request message including the first address to the PCRF. The determining, by the processor 134, to redirect the first Rx session request message to the PCRF according to the NAT translated UE address may include:

The processor 134 determines the UE address according to the NAT translated UE address; the processor 134 determines to determine the first Rx session request message according to the stored correspondence between the UE address and the PCRF. Redirect to the PCRF.

The determining, by the processor 134, the UE address according to the NAT translated UE address may include:

The processor 134 acquires the UE address from the NAT device according to the NAT translated UE address. Alternatively, the determining, by the processor 134, the redirecting the first Rx session request message to the PCRF according to the NAT translated UE address may include: the processor 134 according to the stored NAT converted UE Corresponding relationship between the address and the PCRF, determining to redirect the first Rx session request message to the PCRF. The processor 134 may acquire the NAT-converted UE address from the NAT device according to the UE address, and store the NAT-transformed UE address and location according to the stored correspondence between the UE address and the PCRF. The correspondence between PCRFs. The embodiment of the present invention further provides a system for transmitting a session request. As shown in FIG. 14, the UE141, PCEF142, DRA143, PCRF 144, NAT device 145, and AF146 in the system. The DRA is the DRA described in the foregoing embodiment shown in FIG. 9 to FIG. 12; the NAT device 145 is configured to allocate the NAT-transformed UE address to the UE 141; and the PCEF 142 is configured to The DRA 143 sends the first Gx session request message, and receives the first Gx session response message from the DRA 143. The AF 146 is configured to send the first Rx session request message to the DRA 143, and receive the location from the DRA 143. a first Rx session response message; the PCRF 144 is configured to receive a second Gx session request message that is sent by the PCEF 142 and that includes the first address, and a second that includes the first address that is sent by the AF 146 Rx session request message.

Specifically, the communication process between the devices may include the following steps: 1401. The PCEF 142 allocates the UE address to the UE 141.

After the UE 141 is attached to the network, the IP-CAN session request is initiated, and the PCEF 142 is connected. After receiving the IP-CAN session establishment request initiated by the UE, the UE is assigned an IP address such as XI, and the UE obtains the assigned address and establishes an IP-CAN session.

1402. The PCEF 142 sends a first Gx session request message to the DRA 143.

After assigning the IP address to the UE 141, the PCEF 142 initiates a Gx session establishment request, and sends a first Gx session request message to the DRA 143, where the first Gx session request message carries the UE address.

1403. DRA143 selects PCRF.

The DRA 143 selects a PCRF 144 in the domain in which the DRA is located according to the UE address XI carried in the received first Gx session request message. The DRA 143 may store the correspondence between the address (e.g., F1) of the PCRF 144 and the UE address. The correspondence between the stored PCRF and the UE address is achieved by storing the correspondence between the address of the PCRF 144 and the UE address.

Optionally, steps 1404 to 1406 can be performed at this time.

1404. The DRA 143 sends an address query request to the NAT device 145, where the address query request carries a UE address.

The DRA 143 sends an address query request to the NAT device 145, where the address query request carries a UE address, such as XI.

1405. The NAT device 145 queries and returns a NAT translated UE address corresponding to the UE address.

The NAT device 145 can perform address translation on the address of the UE carried in the received service data of the UE. When the service data of the UE is transmitted to the NAT device 145 through the PCEF, the user service information of the carried UE is the UE address, and the NAT device 145 carries the service data of the UE after receiving the service data. The address of the UE is translated, and the translated address is called the UE address after NAT conversion.

The NAT device 145 may query and return the NAT-converted UE address corresponding to the UE address to the DRA 143 according to the UE address in the received address query request. For example, the UE address XI corresponds to the NAT translated UE address, such as the IP address Y1, or the IP address XI and the port number P1.

1406. The DRA 143 establishes a binding relationship. After receiving the NAT-converted UE address returned by the NAT device 145, the DRA 143 establishes a binding relationship between the PCRF address, the UE address, and the NAT-converted UE address according to the NAT-transformed UE address. (ie correspondence). For example, the correspondence between F 1 , XI and Y1 , or the correspondence between Fl, XI and (Yl , P1 ).

1407. The DRA 143 returns a first Gx session response message to the PCEF 142.

The DRA 143 returns a response message of the first Gx session request message to the PCEF 142, where the first Gx session response message carries a first address and an address of the PCRF 144, where the first address includes a UE address or a NAT converted UE address.

1408. PCEF142 establishes a Gx session with PCRF 144.

After receiving the address of the PCRF 144, the PCEF 142 may directly send a second Gx session request message carrying the first address to the PCRF 144 without redirecting the DRA 143. The PCRF 1414 directly requests the message according to the second Gx session request message. The PCEF sends a second Gx session response message, and no longer passes the redirected DRA 143, and the PCRF 144 and the PCEF 142 directly establish a Gx session.

1409. The UE 141 registers information with the AF 146.

The UE 141 accesses the network, and after being assigned to the UE address, performs SIP registration (Register) to the AF 146, and the UE passes through the NAT device when registering with the AF, so the user service information registered by the UE 141 in the AF 146 is The NAT converted UE address after the NAT conversion.

1410. The AF 146 sends a first Rx session request message to the DRA 143.

The AF 146 sends a first Rx session request message to the DRA 143, and the user service information carried in the first Rx session request message is a NAT translation, when the user is requested to perform the Rx session to provide the PCRF with the user service information of the UE. After the UE address.

1411. The DRA 143 determines to redirect the first Rx session request message to the PCRF.

After the DRA 73 receives the first Rx session request message sent by the AF 76, if the DRA 144 performs steps 1404 to 1406, the mapping between the NAT translated UE address and the PCRF is already stored in the DRA. At this time, the DRA may directly redirect the Rx session request for the UE 141 to the PCRF according to the correspondence, that is, Determining the AF requires sending an Rx Session Request message to the PCRF. If the DRA 73 does not perform steps 1404 to 1406, the DRA needs to perform the following steps 1411a and 141 1b to redirect the Rx session request to the PCRF according to the NAT translated UE address.

1411a, DRA143 obtains the UE address from NAT145. The DRA 143 obtains the UE address from the NAT device 145 according to the NAT translated UE address. The DRA 143 may send an address query request carrying the NAT-converted UE address to the NAT device 145, and the NAT device 145 may query and return the UE address to the DRA 143 after receiving the address query request.

141 lb, the DRA 73 establishes a binding relationship.

After receiving the UE address returned by the NAT device 145, the DRA 143 establishes a binding relationship between the address of the PCRF, the UE address, and the NAT-converted UE address. The address of the PCRF is the address of the corresponding PCRF 144 selected by the DRA according to the Gx session request message carrying the UE address.

1412. The DRA 143 returns a first Rx session response message to the AF 146.

The DRA 143 returns a response message of the first Rx session request message to the AF 146, where the response message carries the address of the first address and the PCRF 144, where the first address includes a UE address or a NAT converted UE address.

1413. The AF 146 establishes an Rx session with the PCRF 144.

After receiving the address of the PCRF 144 and the first address, the AF 146 may directly send the second Rx session request message carrying the first address to the PCRF 1414 without redirecting the DRA 143. The PCRF 144 directly according to the The second Rx session request message sends a second Rx session response message to the AF 1414, and no longer passes the redirected DRA 143, and the PCRF 144 and the AF 146 directly establish an Rx session.

1414. The PCRF 144 binds the Gx session to the Rx session.

The PCRF 144 establishes a Gx session with the PCEF 142, and after establishing an Rx session with the AF 1414, the Gx session is bound to the Rx session. Method, device and system for transmitting session request provided by embodiment of the present invention, by DRA Transmitting, to the AF and the PCEF, a first Gx session response message and a first Rx session response message carrying the same first address and a PCRF address, respectively, so that the PCEF and the AF respectively send the same to the PCRF The second Gx session request message and the second Rx session request message of the first address, so that the PCRF binds the Gx session and the Rx session under the same UE, thereby selecting the correct PCC rule.

The above method embodiments, device embodiments, and system embodiments belong to the same inventive concept. To accurately understand the contents of the present specification, the descriptions between the various embodiments may be mutually referred to and complement each other.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A method for transmitting a session request, comprising:

The method according to claim 1, wherein the DRA determines to send a second Rx session request message to the PCRF according to the NAT translated UE address, including:

Determining, by the DRA, the UE address according to the NAT translated UE address; the DRA determining to send the second Rx session request message to the PCRF according to the stored correspondence between the UE address and the PCRF .

The method according to claim 2, wherein the determining, by the DRA, the UE address according to the NAT translated UE address, includes:

The DRA acquires the UE address from the NAT device according to the NAT translated UE address.

The method according to claim 4, further comprising: the DRA acquiring the NAT-converted UE address from a NAT device according to the UE address; the DRA is based on the stored UE address and Corresponding relationship between the PCRF and the correspondence between the UE address after the NAT conversion and the PCRF.

The method according to any one of claims 1 to 5, wherein the Gx session request message is sent by a policy and charging execution execution entity PCEF, and the Rx session request message is sent by an application function entity AF. of.

The method according to any one of claims 1 to 6, wherein the UE address is an IP address of the UE, and the NAT converted UE address is a NAT translation corresponding to the IP address of the UE. The subsequent IP address is either a NAT-converted IP address and port number corresponding to the IP address of the UE.

8. A diameter routing agent DRA, comprising:

And an Rx sending unit, configured to send the second Rx session request message to the PCRF, where the second Rx session request message includes the first address.

The DRA according to claim 8, wherein the processing unit comprises: a first processing subunit and a second processing subunit; The first processing subunit, configured to determine the UE address according to the NAT translated UE address;

The DRA according to claim 9, wherein the first processing sub-unit is specifically configured to acquire the UE address from a NAT device according to the NAT translated UE address.

The DRA according to claim 8, wherein the processing unit comprises: a third processing subunit;

The DRA according to claim 1 , wherein the third processing sub-unit is further configured to acquire, according to the UE address, the NAT-transformed UE address from a NAT device, according to the stored UE. Corresponding relationship between the address and the PCRF, and storing a correspondence between the NAT translated UE address and the PCRF.

The DRA according to any one of claims 8 to 12, wherein the Gx session request message is sent by a policy and charging execution execution entity PCEF, and the Rx session request message is sent by an application function entity AF. of.

The DRA according to any one of claims 8 to 13, wherein the UE address is an IP address of the UE, and the NAT converted UE address is a NAT translation corresponding to the IP address of the UE. The subsequent IP address is either a NAT translated IP address and a port number corresponding to the IP address of the UE.

15. A diameter routing agent DRA, comprising: a receiver, a transmitter, a memory, and a processor coupled to the receiver, the transmitter, and the memory, respectively, the memory storing a set of program codes, The processor calls the program code in the memory for performing the operations of any one of claims 1 to 7.

16. A system, the system comprising: a user equipment UE, a policy and charging execution entity PCEF, a diameter routing agent DRA, a policy and a charging rule function entity a PCRF, a network address translation NAT device, an application function entity AF; the DRA is the DRA according to any one of claims 8 to 14;

The NAT device is configured to allocate the NAT-transformed UE address to the UE; the PCEF is configured to send the first Gx session request message to the DRA; and the AF is used to send the location to the DRA The first Rx session request message is used by the PCRF to receive the second Gx session request message and the second Rx session request message sent by the DRA.

A method for transmitting a session request, comprising: a diameter routing proxy DRA receiving policy and a first Gx session request message sent by a charging execution entity PCEF, wherein the first Gx session request message includes a user equipment The first address is the address of the first address and the PCRF, and the first address is the address of the UE or the location of the first Gx session response message. Determining a NAT-converted UE address corresponding to the UE address, so that the PCEF sends a second Gx session request message including the first address to the PCRF; the DRA receives a first Rx session sent by the application function entity AF a request message, where the first Rx session request message includes the NAT translated UE address;

Determining, by the DRA, the first Rx session request message to the PCRF according to the NAT translated UE address;

The method according to claim 17, wherein the determining, by the DRA, the redirecting the first Rx session request to the PCRF according to the NAT translated UE address comprises:

Determining, by the DRA, the UE address according to the NAT translated UE address; the DRA determining to redirect the first Rx session request message to the location according to the stored correspondence between the UE address and the PCRF Said PCRF.

The method according to claim 18, wherein the determining, by the DRA, the UE address according to the NAT translated UE address, includes: The DRA acquires the UE address from a NAT device according to the NAT translated UE address.

The method according to claim 17, wherein the determining, by the DRA, the first Rx session request to be redirected to the PCRF according to the NAT translated UE address, includes:

And determining, by the DRA, to redirect the first Rx session request to the PCRF according to the stored correspondence between the NAT translated UE address and the PCRF.

The method according to claim 20, further comprising:

Determining, by the DRA, the NAT translated UE address from a NAT device according to the UE address;

And the DRA stores the correspondence between the NAT translated UE address and the PCRF according to the stored correspondence between the UE address and the PCRF.

The method according to any one of claims 17 to 21, wherein the UE address is an IP address of the UE, and the NAT converted UE address is a NAT translation corresponding to the IP address of the UE. The subsequent IP address is either a NAT translated IP address and a port number corresponding to the IP address of the UE.

23. A diameter routing agent DRA, comprising:

An Rx receiving unit, configured to receive a first Rx session request message sent by the application function entity AF, where the first Rx session request message includes the NAT converted UE address, and a processing unit, configured to receive according to the Rx Determining, by the unit, the NAT converted UE address in the first Rx session request message to cancel the first Rx session request Redirected to the PCRF;

An Rx sending unit, configured to send a first Rx session response message to the AF, where the first Rx session response message includes the first address and an address of the PCRF, so that the AF sends the PCRF to the PCRF The second Rx session request message of the first address.

The DRA according to claim 23, wherein the processing unit comprises: a first processing subunit and a second processing subunit;

The second processing sub-unit is configured to determine to redirect the first Rx session request message to the PCRF according to the stored correspondence between the UE address and the PCRF.

The DRA according to claim 24, wherein the first processing sub-unit is specifically configured to acquire the UE address from a NAT device according to the NAT translated UE address.

The DRA according to claim 23, wherein the processing unit comprises: a third processing subunit;

The third processing sub-unit is configured to determine to redirect the first Rx session request message to the PCRF according to the stored correspondence between the NAT translated UE address and the PCRF.

The DRA according to claim 26, wherein the third processing sub-unit is further configured to acquire the NAT-transformed UE address from the NAT device according to the received UE address, according to the stored location. Corresponding relationship between the UE address and the PCRF, and storing a correspondence between the NAT translated UE address and the PCRF.

The DRA according to any one of claims 23 to 27, wherein the UE address is an IP address of the UE, and the NAT-transformed UE address is a NAT translation corresponding to the IP address of the UE. The subsequent IP address is either a NAT translated IP address and a port number corresponding to the IP address of the UE.

29. A diameter routing agent DRA, comprising: a receiver, a transmitter, a memory, and a processor coupled to the receiver, the transmitter, and the memory, respectively, the memory storing a set of program codes, The processor calls the program code in the memory for The operation of any one of claims 17 to 22 is performed.

30. A system, wherein the system comprises: a user equipment UE, a policy and charging execution entity PCEF, a diameter routing proxy DRA, a policy and charging rule function entity PCRF, a network address translation NAT device, an application function entity The DRA is the DRA according to any one of claims 23 to 28;

The NAT device is configured to allocate the NAT-transformed UE address to the UE; the PCEF is configured to send the first Gx session request message to the DRA, and receive the first Gx session from the DRA a response message: the AF is used to send the first Rx session request message to the DRA, and receive the first Rx session response message from the DRA; the PCRF is configured to receive the content sent by the PCEF a second GX session request message of the first address and a second Rx session request message that is sent by the AF and includes the first address.