CN101483826B - Method and apparatus for selecting policy and fee charging rule functional entity - Google Patents

Abstract

A method and apparatus for selecting a policy and charging rules functional entity are disclosed. A method includes: in a non-roaming scenario, the DRA receives a message transmitted by a network device that needs to establish a session with the PCRF, and the DRA determines that the PCRF needs to be selected according to the information carried in the message, and then determines according to the stored PCRF information or a predetermined policy. The PCRF is generated, and a message carrying the determined PCRF information is returned to the network device or forwarded to the determined PCRF. Another method includes: in a roaming scenario, the home network DRA receives the message transmitted by the visited network, determines the home network PCRF, and returns a message carrying the determined home network PCRF information to the visited network or sends a message to the visited network. The determined home network PCRF forwards the message. The embodiment of the present invention clarifies the specific implementation process of selecting PCRF, and improves the PCRF selection mechanism.

Description

Method and device for selecting policy and charging rule functional entity

technical field

The invention relates to the technical field of network communication, in particular to a method and a device for selecting policy and charging rule functional entities.

Background technique

In an evolved network such as a network where mobile communication networks and broadband wireless access technologies are integrated, a PCRF Realm (PCRF domain, Policy and Charging Rule Function, policy and charging rule functional entity) can contain multiple PCRFs. PCRF Realm is managed by DRA (Diameter Routing Agent, Diameter routing agent). In the process of establishing a session between network devices such as GW (gateway) and AF (application server) and PCRF, GW and AF need to select PCRF through DRA.

In the process of realizing the present invention, the inventors found that: Regarding the selection of PCRF, only some high-level descriptions are specified at present, and there is no specific implementation method for network devices such as GW and AF to obtain PCRF from DRA. The specific implementation process of network equipment selecting PCRF through DRA needs to be further improved.

Contents of the invention

The embodiments of the present invention provide a method and device for selecting policy and charging rule functional entities, which can select PCRF in various ways, clarify the specific implementation process of selecting PCRF, and improve the implementation mechanism of selecting PCRF. In addition, the routing process to the Diameter routing agent is also specified.

A method for selecting a policy and charging rule functional entity provided by an embodiment of the present invention includes:

In a non-roaming scenario, the Diameter routing agent receives a message transmitted by a network device, and the network device is a network device that needs to establish a session with the selection policy and charging rule functional entity PCRF;

After the Diameter routing agent receives the message transmitted by the network device, it determines the PCRF according to the stored PCRF information or the predetermined strategy, and returns a message carrying the determined PCRF information to the network device or sends the determined PCRF information to the network device. The PCRF forwards the message.

The embodiment of the present invention also provides a method for selecting a policy and charging rule functional entity, including:

In the roaming scenario, the home network Diameter routing agent receives the message transmitted by the visited network;

After receiving the message transmitted by the visited network, the home network Diameter routing agent determines the home network PCRF, and returns a message carrying the determined home network PCRF information to the visited network or sends a message to the determined home network The PCRF forwards the message.

The embodiment of the present invention also provides a Diameter routing agent, including:

The first module is configured to receive a message transmitted by the network device; the message includes: in a non-roaming scenario or in a roaming scenario, the Diameter routing agent where the first module is located is located in the visited network, and the network device is in the same relationship with the PCRF or the home network PCRF Messages transmitted during session establishment;

The second module is configured to determine the PCRF or the visited network PCRF according to the stored PCRF information or the predetermined strategy after the first module receives the message transmitted by the network device;

The third module is configured to return a message carrying the PCRF or visited network PCRF information determined by the second module to the network device, or forward the information received by the first module to the determined PCRF or visited network PCRF said message.

The embodiment of the present invention also provides a Diameter routing agent, including:

The fourth module is configured to receive a message transmitted by the visited network; the message includes: in a roaming scenario, a message transmitted by the visited network during session establishment;

The fifth module is used to determine the home network PCRF after the fourth block receives the message transmitted by the visited network;

The sixth module is configured to return a message carrying the determined home network PCRF information to the visited network or forward the message received by the fourth module to the determined home network PCRF.

Embodiments of the present invention also provide a routing method to a Diameter routing agent, including:

Obtain the packet data network PDN information from the access point name APN;

Acquiring the domain information where the Diameter routing agent is located according to the PDN information;

Routing the message to the Diameter routing agent according to the acquired domain information.

From the description of the above technical solution, it can be seen that in a non-roaming scenario, the Diameter routing agent can return the determined PCRF information to the network device, and can also forward the message transmitted by the network device to the determined PCRF, which defines the Diameter routing agent. It can be used as a Redirect server or an information query server, or as a Proxy agent; in a roaming scenario, the home network Diameter routing agent can return the determined home network PCRF information to the visited network, and can also forward the visit to the determined home network PCRF The message transmitted by the network also clarifies that the Diameter routing agent can be used as a Redirect server or an information query server, or as a Proxy agent; the embodiment of the present invention clarifies the specific implementation process of selecting PCRF in a non-roaming scenario and a roaming scenario, The implementation mechanism of selecting PCRF has been improved. In addition, the embodiment of the present invention also clarifies the routing process to the Diameter routing agent.

Description of drawings

Fig. 1 is the flow chart of the method for selecting PCRF of embodiment one of the present invention;

Fig. 2 is the flow chart of the method for selecting PCRF of embodiment 2 of the present invention;

3 is a flowchart of a method for selecting a PCRF according to Embodiment 3 of the present invention;

4 is a flowchart of a method for selecting a PCRF according to Embodiment 4 of the present invention;

5 is a flowchart of a method for selecting a PCRF according to Embodiment 5 of the present invention;

6 is a flowchart of a method for selecting a PCRF according to Embodiment 6 of the present invention;

7 is a flowchart of a method for selecting a PCRF according to Embodiment 7 of the present invention;

8 is a flowchart of a method for selecting a PCRF according to Embodiment 8 of the present invention;

FIG. 9 is a schematic diagram of a Diameter routing agent according to an embodiment of the present invention.

Detailed ways

In the embodiment of the present invention, the DRA responsible for selecting the PCRF in the evolved network may route the received message to the PCRF instead of routing the received message to the PCRF after selecting the PCRF, That is, the DRA responsible for selecting the PCRF can act as a Redirect server or an information query server, or as a Proxy agent.

In a non-roaming application scenario, the DRA corresponding to the network device that needs to establish a session is responsible for selecting a PCRF. In the roaming application scenario, the DRA responsible for selecting the PCRF may be only the home network DRA, or may be the visited network DRA and the home network DRA. The network device in the embodiment of the present invention is a network device that needs to establish a session with PCRF. The network device can be GW or AF. Of course, it can also be other network devices. GW can be Serving GW (Serving Gateway), PDN GW (packet data network gateway), aGW (access Gateway, access gateway) of non-3GPP network, etc. Among them, when the non-3GPP network is WIMAX, the non-3GPP aGW can be ASN GW (Access Service Network Gateway, access service gateway); when the non-3GPP network is CDMA2000 HRPD (High Rate Packet Data network, high-speed packet data network), the non-3GPP 3GPP aGW can be PDSN (Packet Data Serving Node, packet data service node); when the non-3GPP network is IWLAN (Interworking Wireless Local Access network, supporting interworking wireless local access network), the non-3GPP aGW can be ePDG (evolved Packet Data Gateway, Evolved Packet Data Gateway). The embodiment of the present invention does not limit the specific expression form of the network device.

The technical solution for selecting a PCRF provided by the embodiment of the present invention can be applied in a 3GPP system, and can also be applied in a non-3GPP access system. Moreover, it can be applied in the session establishment process of Initial Attach (initial attachment), can also be applied in the session establishment process of handover (handover), and of course, can also be applied in other processes that need to establish a session.

When the technical solution for selecting PCRF provided by the embodiment of the present invention is applied in the 3GPP initial Attach process, and the Serving GW and PDN GW are based on IETF, the Serving GW, PDN GW, and AF need to establish a Session (session) with PCRF, that is, Serving GW, PDN GW and AF all need to interact with DRA to obtain corresponding PCRF information. In the above case, the GW described below for the accompanying drawings includes: Serving GW and PDN GW.

When the technical solution for selecting PCRF provided by the embodiment of the present invention is applied in the 3GPP initial Attach process, and the Serving GW and the PDN GW are based on the GTP protocol, only the PDN GW and the AF need to establish a Session with the PCRF, that is, the PDN GW and the AF need Interact with DRA to obtain corresponding PCRF information. In the above case, the GW described below for the accompanying drawings includes: PDN GW.

When the technical solution for selecting PCRF provided by the embodiment of the present invention is applied in the handover process from other networks to 3GPP, and the Serving GW and the PDN GW are based on IETF, when the Serving GW changes, the PCRF needs to be reset. Select, at this time, the Serving GW needs to interact with the DRA to obtain the corresponding PCRF information. In the above case, the GW described below for the accompanying drawings includes: Serving GW.

When the technical solution for selecting PCRF provided by the embodiment of the present invention is applied in the non-3GPP initialAttach process, and the terminal is roaming or non-roaming based on S2 (the interface between the non-3GPP aGW and the PDN GW), the non-3GPP aGW (access Gateway, access gateway), PDN GW and AF all need to establish a session with PCRF, that is, non-3GPP aGW, PDN GW and AF all need to interact with DRA to obtain PCRF information. In the above case, the GW described below for the accompanying drawings includes: non-3GPP aGW, PDN GW. The non-3GPP aGW can be ePDG, ASN GW, PDSN, etc.

When the technical solution for selecting PCRF provided by the embodiment of the present invention is applied in the non-3GPP initialAttach process, and the terminal roams based on the S8 (interface between Serving GW and PDN GW) interface, that is, when the terminal roams based on the S2+S8 interface, the non-3GPP aGW, PDN GW, Serving GW, and AF all need to establish a session with PCRF, that is, non-3GPP aGW, PDN GW, Serving GW, and AF all need to interact with DRA to obtain PCRF information. In the above case, the GW described below for the accompanying drawings includes: non-3GPP aGW, Serving GW, and PDN GW. Non-3GPP aGW such as ePDG, ASN GW, PDSN, etc.

When the technical solution for selecting PCRF provided by the embodiment of the present invention is applied in the handover process from other networks to non-3GPP, and the terminal roams based on S2, only the non-3GPP aGW may change, that is, the non-3GPP aGW needs to re-select PCRF to establish a new session. In the above case, the GW described below for the accompanying drawings includes: non-3GPP aGW.

When the technical solution for selecting PCRF provided by the embodiment of the present invention is applied in the handover process from other networks to non-3GPP, and the terminal roams based on the S2+S8 interface, both the non-3GPP aGW and the ServingGW may change, that is, the non-3GPP aGW and the ServingGW may change. Serving GW may need to re-select PCRF to establish a new session. In this case, the GW described below for the accompanying drawings includes: any one or both of the non-3GPP aGW and the Serving GW.

The flow of the method for selecting a PCRF provided in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings for different application scenarios.

In an application scenario where the DRA serves as the Redirect server and the terminal is not roaming, the process of selecting a PCRF is shown in Figure 1.

In Figure 1, step 1, GW/AF (GW or AF) determines that it needs to establish a session binding with the corresponding PCRF, and GW/AF sends a session establishment request to DRA according to routing information (such as default routing configuration information) to request Establish a session between GW/AF and PCRF. The session establishment request message can carry terminal identification information, terminal address information, and APN (Access Point Name, service access point name), etc.; or the session establishment request message can carry PDN ID, terminal address information, etc. In addition, the GW/AF may also route the session establishment request message according to the NAI or other information.

After step 2, DRA receives session establishment request message, according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN etc., or according to PDN ID, terminal address information etc.) Selected PCRF information; if the selected PCRF information is saved, the saved PCRF information is obtained directly; if the selected PCRF is not saved, DRA selects a PCRF according to a predetermined local policy (such as DRA according to load sharing, etc. The strategy selects a most suitable PCRF), and saves the selected PCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and PCRF information. The PCRF information saved by the DRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 3. The DRA returns the selected PCRF information to the GW/AF in a redirection notification message.

Step 4. After receiving the redirection notification message returned by the DRA, the GW/AF obtains the PCRF information from the redirection notification message, and sends a session establishment request to the PCRF according to the PCRF information, that is, the GW/AF directly initiates the session establishment process to the PCRF .

Step 5: After receiving the session establishment request sent by the GW/AF, the PCRF returns a session establishment response message to the GW/AF.

The session establishment request in Step 1 of Figure 1 above can also be a query request message, that is, the process in Figure 1 can also be: when GW/AF needs to establish a session with PCRF, it actively sends a query request message to DRA to obtain the corresponding PCRF information; after receiving the query request message, the DRA can select the PCRF using the content described in step 2 of Figure 1 above, and then, the DRA returns the selected PCRF information to the GW/AF in the query response message; after that, the GW/AF Obtain PCRF information from the query response message, and send a session establishment request to the PCRF according to the PCRF information. At this time, the DRA acts as an information query server.

In an application scenario where the DRA serves as the Redirect server and the terminal is roaming, an embodiment process of selecting a PCRF is shown in FIG. 2 . In this embodiment, both vDRA (visited network DRA) and hDRA participate in PCRF selection, that is, both vDRA and hDRA are responsible for PCRF selection; there is an intercommunication interface between vPCRF (visited network PCRF) and hDRA for the connection between vPCRF and hDRA message transmission between.

In Figure 2, in step 1, GW/AF determines that a session binding needs to be established with hPCRF (home network PCRF) in the home network, and GW/AF sends a message to vDRA in the visited network according to routing information (such as default routing configuration information) A session establishment request is used to request establishment of a session between the GW/AF and the hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, GW/AF can also perform routing according to NAI or other information.

Step 2. After vDRA receives the session establishment request message, it judges whether to save the existing The vPCRF information in the selected visited network; if the selected vPCRF information is saved, the saved vPCRF information is obtained directly; if the selected vPCRF information is not saved, vDRA selects a vPCRF according to a predetermined local policy (such as vDRA Select a most suitable vPCRF according to policies such as load sharing), and save the selected vPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and vPCRF information. The vPCRF information saved by vDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 3. The vDRA returns the selected vPCRF information to the GW/AF in a redirection notification message. In addition, the redirection notification message may also carry NAI information or home domain information.

Step 4: After receiving the redirection notification message returned by vDRA, GW/AF obtains vPCRF information from the redirection notification message, and sends a session establishment request to vPCRF according to the vPCRF information, that is, GW/AF directly initiates the session establishment process to vPCRF .

Step 5. After receiving the session establishment request, the vPCRF sends a session establishment request to the hDRA in the home network according to routing information (such as default routing configuration information), so as to request to establish a session with hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, vPCRF can also perform routing according to NAI or other information. The process for vPCRF to send a session establishment request to hDRA can be as follows: when the destination address of the redirection notification message received by vPCRF points to vPCRF (for example, the host name in the redirection notification message points to vPCRF), and the domain name points to the visited network, then vPCRF uses the terminal identifier obtain the user's home network information, and modify the domain name in the destination address of the session establishment request message to point to the home network, and then, the vPCRF sends the session establishment request.

Step 6: After hDRA receives the session establishment request message, it judges whether to save the existing information according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN, etc., or according to PDN ID, terminal address information, etc.) The hPCRF information in the selected home network; if the selected hPCRF information is saved, the saved hPCRF information is directly obtained; if the selected hPCRF is not saved, hDRA selects a hPCRF according to a predetermined local strategy (such as hDRA Select a most suitable hPCRF according to strategies such as load sharing), and save the selected hPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and hPCRF information. The hPCRF information stored by hDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 7: The hDRA returns the selected hPCRF information to the vPCRF in a redirection notification message.

Step 8: After receiving the redirection notification message returned by the hDRA, the vPCRF sends a session establishment request message to the hPCRF information according to the hPCRF information carried in the redirection notification message. The process for the vPCRF to send the session establishment request message may be: modifying the host name in the destination address of the redirect notification message returned by the hDRA to point to the home network hPCRF.

Step 9: After receiving the session establishment request message, the hPCRF returns a session establishment response message to the vPCRF.

Step 10, vPCRF forwards the received session establishment response message to GW/AF. Thus, the session establishment process between the GW/AF and the hPCRF is completed.

The session establishment request in Step 1 and Step 5 of Figure 2 above can also be a query request message, that is, the process in Figure 2 can also be: when GW/AF needs to establish a session with PCRF, it actively sends a query request message to vDRA to Obtain the corresponding vPCRF information; after vDRA receives the query request message, it can use the content described in step 2 of Figure 2 to select a vPCRF, and return the selected vPCRF information to the GW/AF in the query response message; after that, the GW/ AF obtains vPCRF information from the query response message, and sends a session establishment request to vPCRF according to the vPCRF information; after receiving the session establishment request, vPCRF sends a query request message to hDRA to obtain the corresponding hPCRF information; hDRA receives the query request message Finally, the content described in step 6 of Figure 2 above can be used to select hPCRF, and the selected hPCRF information will be carried in the query response message and returned to vPCRF; vPCRF obtains hPCRF information from the received query response message, and sends hPCRF information to hPCRF Send a session establishment request, and the subsequent steps are as described in steps 9 and 10 in Figure 2. At this time, the DRA acts as an information query server.

In an application scenario where the DRA serves as the Redirect server and the terminal is roaming, the flow of another embodiment of selecting a PCRF is shown in FIG. 3 . In this embodiment, both vDRA and hDRA participate in PCRF selection, that is, both vDRA and hDRA are responsible for PCRF selection; there is an intercommunication interface between vDRA and hDRA for message transmission between vDRA and hDRA.

In Figure 3, in step 1, GW/AF determines that a session binding needs to be established with hPCRF in the home network, and GW/AF sends a session establishment request to vDRA in the visited network according to routing information (such as default routing configuration information) to Request to establish a session between GW/AF and hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, GW/AF can also perform routing according to NAI or other information.

Step 2. After receiving the session establishment request, the vDRA determines that the PCRF that needs to establish the session is in the home realm, and then the vDRA forwards the session establishment request message to the hDRA.

After step 3, hDRA receives session establishment request message, according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN etc., or according to PDN ID, terminal address information etc.) The hPCRF information in the selected home network; if the selected hPCRF information is saved, the saved hPCRF information is directly obtained; if the selected hPCRF is not saved, hDRA selects a hPCRF according to a predetermined local strategy (such as hDRA Select a most suitable hPCRF according to strategies such as load sharing), and save the selected hPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and hPCRF information. The hPCRF information stored by hDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 4: The hDRA returns the selected hPCRF information to the vDRA in a redirection notification message.

Step 5. After vDRA receives the redirection notification message, it judges whether to save the existing information according to the information carried in the redirection notification message (such as according to the terminal identification information, terminal address information and APN, etc., or according to the PDN ID, terminal address information, etc.) The vPCRF information in the selected visited network; if the selected vPCRF information is saved, the saved vPCRF information is obtained directly; if the selected vPCRF information is not saved, vDRA selects a vPCRF according to a predetermined local policy (such as vDRA Select a most suitable vPCRF according to policies such as load sharing), and save the selected vPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and vPCRF information. The vPCRF information saved by vDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 6. The vDRA adds the selected vPCRF information to the redirection notification message it receives, and forwards the redirection notification message to the GW/AF.

Step 7: GW/AF acquires hPCRF information and vPCRF information from the received redirection notification message, and sends a session establishment request message to vPCRF according to the vPCRF information, and the session establishment request message carries hPCRF information. In the embodiment of the present invention, hPCRF information may be carried in the session establishment request message by extending a new AVP (Attribute-Value Pairs, attribute-value pair) in the session establishment request message.

Step 8. The vPCRF acquires hPCRF information from the AVP of the received session establishment request message, and forwards the session establishment request message to hPCRF.

Step 9: The hPCRF returns a session establishment response message to the vPCRF.

Step 10, the vPCRF forwards the session establishment response message to the GW/AF. Thus, the session establishment process between the GW/AF and the hPCRF is completed.

The session establishment request in Step 1 and Step 2 of Figure 3 above can also be a query request message, that is, the process in Figure 3 can also be: when GW/AF needs to establish a session with PCRF, it actively sends a query request message to vDRA to Obtain the corresponding vPCRF information; after receiving the query request message, vDRA sends a query request message to hDRA to obtain the corresponding hPCRF information; after receiving the query request message, hDRA can use the content described in step 3 of Figure 3 to select hPCRF , and carry the selected hPCRF information in the query response message and return it to vDRA; vDRA can use the content described in step 5 of Figure 3 to select vPCRF, and carry the hPCRF information and the selected vPCRF information in the query response message and return it to GW/ AF; after that, GW/AF obtains vPCRF information from the query response message, and sends a session establishment request to vPCRF according to the vPCRF information, and the session establishment request carries hPCRF information; after vPCRF receives the session establishment request, according to the session establishment request The hPCRF information in the hPCRF forwards the session establishment request message to the hPCRF, and the subsequent steps are as described in steps 9 and 10 in FIG. 3 . At this time, the DRA acts as an information query server.

In an application scenario where the DRA serves as the Redirect server and the terminal is roaming, the flow of another embodiment of selecting a PCRF is shown in FIG. 4 . In this embodiment, vDRA (visited network DRA) does not participate in PCRF selection, and hDRA participates in PCRF selection, that is, vDRA does not have the responsibility for PCRF selection, but hDRA has the responsibility for PCRF selection; there is an intercommunication interface between vPCRF and hDRA to perform vPCRF Message transmission with hDRA.

In Fig. 4, in step 1, the GW/AF determines that a session binding needs to be established with the hPCRF in the home network, and the GW/AF sends a session establishment request message to the vPCRF. The GW/AF may send a session establishment request message to a pre-configured vPCRF, and the GW/AF may also select a vPCRF according to a predetermined local policy and send a session establishment request message to the selected vPCRF.

Step 2. After receiving the session establishment request, the vPCRF sends a session establishment request to the hDRA in the home network according to routing information (such as default routing configuration information), so as to request to establish a session with hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, the vPCRF may also route the session establishment request message according to the NAI or other information. The process for vPCRF to send a session establishment request to hDRA can be as follows: when the destination address of the redirection notification message received by vPCRF points to vPCRF (for example, the host name in the redirection notification message points to vPCRF), and the domain name points to the visited network, then vPCRF uses the terminal identifier obtain the user's home network information, and modify the domain name in the destination address of the session establishment request message to point to the home network, and then, the vPCRF sends the session establishment request.

After step 3, hDRA receives session establishment request message, according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN etc., or according to PDN ID, terminal address information etc.) The hPCRF information in the selected home network; if the selected hPCRF information is saved, the saved hPCRF information is directly obtained; if the selected hPCRF is not saved, hDRA selects a hPCRF according to a predetermined local strategy (such as hDRA Select a most suitable hPCRF according to strategies such as load sharing), and save the selected hPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and hPCRF information. The hPCRF information stored by hDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 4: The hDRA returns the selected hPCRF information to the vPCRF in a redirection notification message.

Step 5. The vPCRF acquires hPCRF information from the received redirection notification message, and sends a session establishment request message to the hPCRF according to the hPCRF information. The process for the vPCRF to send the session establishment request message to the hPCRF may be: the vPCRF modifies the hostname in the destination address of the redirection notification message to hPCRF.

Step 6: After receiving the session establishment request message, the hPCRF returns a session establishment response message to the vPCRF.

Step 7. The vPCRF forwards the received session establishment response message to the GW/AF. Thus, the session establishment process between the GW/AF and the hPCRF is completed.

The session establishment request in step 2 of Figure 4 above can also be a query request message, that is, the process in Figure 4 can also be: GW/AF sends a session establishment request message to vPCRF when it needs to establish a session with PCRF; vPCRF receives After the session establishment request message, send a query request message to hDRA to obtain the corresponding hPCRF information; after receiving the query request message, hDRA can use the content described in step 3 of Figure 4 to select hPCRF, and carry the selected hPCRF information in The query response message is returned to vPCRF; the subsequent steps are described in steps 5, 6, and 7 in Figure 4. At this time, the DRA acts as an information query server.

In an application scenario where the DRA acts as a Proxy and the terminal is not roaming, the process of selecting a PCRF is shown in Fig. 5 .

In Figure 5, step 1, GW/AF (GW or AF) determines that it needs to establish a session binding with the corresponding PCRF, and GW/AF sends a session establishment request to DRA according to routing information (such as default routing configuration information) to request Establish a session between GW/AF and PCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, the GW/AF may also route the session establishment request message according to the NAI or other information.

After step 2, DRA receives session establishment request message, according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN etc., or according to PDN ID, terminal address information etc.) Selected PCRF information; if the selected PCRF information is saved, the saved PCRF information is obtained directly; if the selected PCRF is not saved, DRA selects a PCRF according to a predetermined local policy (such as DRA according to load sharing, etc. The strategy selects a most suitable PCRF), and saves the selected PCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and PCRF information. The PCRF information saved by the DRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 3. The DRA forwards the session establishment request message to the selected PCRF.

Step 4: After receiving the session establishment request message, the PCRF establishes a session binding with the GW/AF, and returns a session establishment response message to the DRA.

Step 5. The DRA forwards the session establishment response message to the GW/AF.

In an application scenario where the DRA acts as a Proxy and the terminal is roaming, an embodiment process of selecting a PCRF is shown in FIG. 6 . In this embodiment, both vDRA (visited network DRA) and hDRA participate in PCRF selection, that is, both vDRA and hDRA are responsible for PCRF selection; there is an intercommunication interface between vPCRF (visited network PCRF) and hDRA for the connection between vPCRF and hDRA message transmission between.

In Figure 6, in step 1, GW/AF determines that a session binding needs to be established with hPCRF (home network PCRF) in the home network, and GW/AF sends a message to vDRA in the visited network according to routing information (such as default routing configuration information) A session establishment request is used to request establishment of a session between the GW/AF and the hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, the GW/AF may also route the session establishment request message according to the NAI or other information.

Step 2. After vDRA receives the session establishment request message, it judges whether to save the existing The vPCRF information in the selected visited network; if the selected vPCRF information is saved, the saved vPCRF information is obtained directly; if the selected vPCRF information is not saved, vDRA selects a vPCRF according to a predetermined local policy (such as vDRA Select a most suitable vPCRF according to policies such as load sharing), and save the selected vPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and vPCRF information. The vPCRF information saved by vDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 3. The vDRA forwards the session establishment request message to the selected vPCRF.

Step 4. After receiving the session establishment request, the vPCRF sends a session establishment request to the hDRA in the home network according to routing information (such as default routing configuration information), so as to request to establish a session with hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, the vPCRF may also route the session establishment request message according to the NAI or other information.

After step 5, hDRA receives session establishment request message, according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN etc., or according to PDN ID, terminal address information etc.) The hPCRF information in the selected home network; if the selected hPCRF information is saved, the saved hPCRF information is directly obtained; if the selected hPCRF is not saved, hDRA selects a hPCRF according to a predetermined local strategy (such as hDRA Select a most suitable hPCRF according to strategies such as load sharing), and save the selected hPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and hPCRF information. The hPCRF information stored by hDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 6: The hDRA forwards the session establishment request message to the selected hPCRF.

Step 7: After receiving the session establishment request message, the hPCRF establishes a session binding with the GW/AF, and returns a session establishment response message to the hDRA.

Step 8: The hDRA forwards the received session establishment response message to the vPCRF.

Step 9: The vPCRF forwards the received session establishment response message to the vDRA.

Step 10, vDRA forwards the received session establishment response message to GW/AF. Thus, the session establishment process between the GW/AF and the hPCRF is completed.

In an application scenario where the DRA acts as a Proxy and the terminal is roaming, the flow of another embodiment of selecting a PCRF is shown in FIG. 7 . In this embodiment, vDRA does not participate in PCRF selection, and hDRA participates in PCRF selection, that is, vDRA does not bear PCRF selection responsibility, and hDRA both bears PCRF selection responsibility; there is an intercommunication interface between vDRA and hDRA to perform message transmission.

In Figure 7, in step 1, GW/AF determines that a session binding needs to be established with hPCRF in the home network, and GW/AF sends a session establishment request to vDRA in the visited network according to routing information (such as default routing configuration information) to Request to establish a session between GW/AF and hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, GW/AF can also perform routing according to NAI or other information.

Step 2. After receiving the session establishment request, the vDRA determines that the PCRF that needs to establish the session is in the home realm, and then the vDRA forwards the session establishment request message to the hDRA.

After step 3, hDRA receives session establishment request message, according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN etc., or according to PDN ID, terminal address information etc.) The hPCRF information in the selected home network; if the selected hPCRF information is saved, the saved hPCRF information is directly obtained; if the selected hPCRF is not saved, hDRA selects a hPCRF according to a predetermined local strategy (such as hDRA Select a most suitable hPCRF according to strategies such as load sharing), and save the selected hPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and hPCRF information. The hPCRF information stored by hDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 4: The hDRA forwards the session establishment request message to the selected hPCRF.

Step 5, hPCRF returns a session establishment response message to hDRA.

Step 6: The hDRA returns a session establishment response message to the vDRA.

Step 7. The vDRA forwards the session establishment response message to the GW/AF. Thus, the session establishment process between the GW/AF and the hPCRF is completed.

In an application scenario where the DRA acts as a Proxy and the terminal is roaming, the flow of another embodiment of selecting a PCRF is shown in FIG. 8 . In this embodiment, vDRA does not participate in PCRF selection, and hDRA participates in PCRF selection, that is, vDRA does not bear the responsibility of PCRF selection, and hDRA bears the responsibility of PCRF selection; there is an intercommunication interface between vPCRF and hDRA to perform communication between vPCRF and hDRA message transmission.

In Fig. 8, in step 1, the GW/AF determines that a session binding needs to be established with the hPCRF in the home network, and the GW/AF sends a session establishment request message to the vPCRF. The GW/AF may send a session establishment request message to a pre-configured vPCRF, and the GW/AF may also select a vPCRF according to a predetermined local policy and send a session establishment request message to the selected vPCRF.

Step 2. After receiving the session establishment request, the vPCRF sends a session establishment request to the hDRA in the home network according to routing information (such as default routing configuration information), so as to request to establish a session with hPCRF. The session establishment request message may carry terminal identification information, terminal address information, and APN, etc.; or the session establishment request message may carry PDN ID, terminal address information, etc. In addition, the vPCRF may also route the session establishment request message according to the NAI or other information.

After step 3, hDRA receives session establishment request message, according to the information carried in the session establishment request message (such as according to terminal identification information, terminal address information and APN etc., or according to PDN ID, terminal address information etc.) The hPCRF information in the selected home network; if the selected hPCRF information is saved, the saved hPCRF information is directly obtained; if the selected hPCRF is not saved, hDRA selects a hPCRF according to a predetermined local strategy (such as hDRA Select a most suitable hPCRF according to strategies such as load sharing), and save the selected hPCRF information, and the saved format may be: the corresponding relationship between terminal identifier, terminal address, APN and hPCRF information. The hPCRF information stored by hDRA can be one or more of PCRF ID, PCRF IP Address, and PCRF FQDN.

Step 4: The hDRA forwards the session establishment request message to the selected hPCRF.

Step 5, hPCRF returns a session establishment response message to hDRA.

Step 6: The hDRA returns a session establishment response message to the vDRA.

Step 7. The vDRA forwards the session establishment response message to the GW/AF. Thus, the session establishment process between the GW/AF and the hPCRF is completed.

In each of the embodiments described above, the route to the DRA (including the DRA in the non-roaming scenario, and the visited network DRA or the home network DRA in the roaming scenario) may require PDN information (such as PDN ID), that is, use the auxiliary PDN information to implement routing to the DRA. Since there are multiple implementation processes for selecting the PCRF, the operating entity that executes the routing to the DRA is also different. The entity may be the GW/AF, or the vPCRF, or the vDRA. In practical applications, the Realm (domain) where the PCRF is located can be divided according to the PDN ID. In this case, the implementation process of obtaining PDN information can include the following processes:

Before performing Diameter routing, the operating entity that executes the routing to DRA needs to obtain the corresponding PDN information from the APN, such as PDN ID, and then obtain the Realm where the corresponding DRA is located according to the PDN information. Obtaining the Realm where the corresponding DRA is located according to the PDN information can be achieved by: directly extracting the Realm information from the PDN information; or: obtaining the Realm information according to the information configured on the network entity that needs to access the DRA. The configuration here Information such as: PDN information and the mapping table of the Realm where the DRA is located. The embodiment of the present invention does not limit the specific form of the network entity that accesses the DRA.

After acquiring the Realm information where the corresponding DRA is located, the operating entity that executes the routing to the DRA uses the acquired Realm information where the DRA is located as the Destination Realm for routing.

The DRA provided in the embodiments of the present invention will be described below with reference to the accompanying drawings.

Accompanying drawing 9 is a schematic diagram of DRA, and the DRA in Fig. 9 may include: a first module, a second module, a third module, a fourth module, a fifth module, a sixth module and a seventh module. It should be noted that, when the terminal is in a non-roaming situation, or when the terminal is in a roaming state and the DRA is in a visited network, through the operations of the first module, the second module and the third module, or through the first module, the second The operations of the module, the third module and the seventh module can successfully select the PCRF or the home network PCRF. When the terminal is in the roaming state and the DRA is in the home network, through the operations of the fourth module, the fifth module and the sixth module, the home network PCRF can be successfully selected.

The first module receives the message transmitted by the network device. That is, in the non-roaming scenario, the network device needs to establish a session with the PCRF, the network device sends a message to the DRA, and the first module receives the message sent by the network device; in the roaming scenario, the network device needs to establish a session with the hPCRF, the network device A message is sent to the vDRA, and the first module receives the message sent by the network device. The message that the first module receives can be the session establishment request message that is used to set up session, and at this moment, the DRA where the first module is located has acted as the role of Redirect server or Proxy agent; The message that the first module receives also can be information inquiry request message, at this time, the DRA where the first module is located acts as an information query server.

In a non-roaming scenario, the second module can determine whether PCRF needs to be selected by using the information carried in the message received by the first module. For example, the second module determines that the message received by the first module is a session establishment request message or an information query request. After receiving the message, it is determined that PCRF needs to be selected. If it is judged that PCRF needs to be selected, then the second module uses the PCRF information stored in the DRA to determine the PCRF, or the second module selects the PCRF according to a predetermined policy, for example, the second module determines that the PCRF information stored in the DRA does not match the first module After the information carried in the received message matches the PCRF, a predetermined policy is used to select the PCRF. The PCRF information stored in the DRA may be the correspondence relationship information between terminals and PCRFs. The PCRF information stored in the DRA can be set through static configuration or dynamic configuration. In the dynamic configuration mode, for example, the second module in the DRA allocates the PCRF according to a predetermined policy, and after the allocation is completed, the DRA stores the allocated PCRF information.

In the roaming scenario, the second module can determine whether to select vPCRF by using the information carried in the message received by the first module. For example, the second module determines that the message received by the first module is a session establishment request message or an information query request message. After that, it is determined that vPCRF needs to be selected. If it is judged that vPCRF needs to be selected, then the second module uses the vPCRF information stored in vDRA to determine vPCRF, or the second module selects vPCRF according to a predetermined strategy, for example, the second module determines that the vPCRF information stored in vDRA does not match the first module After the information carried in the received message matches the vPCRF, a predetermined policy is used to select the vPCRF. The vPCRF information stored in the DRA may be the correspondence relationship information between the terminal and the vPCRF. The vPCRF information stored in the vDRA can be set through static configuration or dynamic configuration. In a dynamic configuration mode, for example, the second module in the vDRA allocates the vPCRF according to a predetermined policy, and after the allocation is completed, the vDRA stores the allocated vPCRF information.

After the second module determines the PCRF or vPCRF, the third module may return a message carrying the PCRF information or vPCRF information determined by the second module to the network device, or forward the first message to the PCRF or vPCRF determined by the second module. The message received by the module. When the message received by the first module is a session establishment request message, the third module may return a redirection notification carrying PCRF information or vPCRF information to the network device (such as step 3 in FIG. 1 and step 3 in FIG. 2 above), or The session establishment request message is forwarded to the determined PCRF or vPCRF (such as step 3 in FIG. 5 and step 3 in FIG. 6 ). When the message received by the first module is an information query request message, the third module may return an information query response message carrying PCRF information or vPCRF information to the network device.

In the roaming scenario, when the DRA where the first module, the second module, and the third module are located is a vDRA, and the vDRA is responsible for selecting PCRF, the first module, the second module, and the third module execute as above Described operation. In the case that the vDRA is not responsible for selecting the PCRF, it is enough for the vDRA to directly forward the message transmitted by the network device to the hDRA (step 2 in Figure 7).

In a roaming scenario where the DRA is in the home network, the visited network will send a message to the DRA in the home network (hDRA) when the network device needs to establish a session with the hPCRF. For example, the PCRF in the visited network sends a message to The hDRA sends a message, and another example is that the vDRA in the visited network sends a message to the hDRA. The fourth module in the hDRA receives the message sent by the visited network. The message received by the fourth module may be a message sent by the network device forwarded by the visited network, or a new message generated by the visited network after receiving the message sent by the network device, such as an information query request message. The scene of the fourth module receiving the message sent by the visited network is as described above in step 5 in FIG. 2, step 2 in FIG. 3, step 2 in FIG. 4, step 4 in FIG. 6, step 2 in FIG. Step 2 in 8 etc.

After the fourth module receives the message sent by the visited network, the fifth module judges whether the hPCRF needs to be selected according to the information carried in the message, and determines the hPCRF after judging that the hPCRF needs to be selected. The process of determining the hPCRF by the fifth module may be: the fifth module determines the hPCRF by using the PCRF information stored in the hDRA, or the fifth module selects the hPCRF according to a predetermined strategy. After the information carried in the message received by the fourth module matches the hPCRF, the hPCRF is selected using a predetermined strategy. The hPCRF information stored in the hDRA may be the correspondence relationship information between terminals and PCRFs. The hPCRF information stored in the hDRA can be set through static configuration or dynamic configuration. In the dynamic configuration mode, for example, the fifth module in hDRA allocates hPCRF according to a predetermined policy, and after the allocation is completed, hDRA stores the allocated hPCRF information.

After the fifth module determines the hPCRF, the sixth module may return a message carrying the hPCRF information determined by the fifth module to the visited network, or forward the message received by the fourth module to the hPCRF determined by the fifth module. When the message received by the fourth module is a session establishment request message, the sixth module may return a redirection notification carrying hPCRF information to the visited network (such as step 7 in FIG. 2 above, step 4 in FIG. 3 , and step 4 in FIG. 4 ), The session establishment request message may also be forwarded to the determined hPCRF (such as step 6 in FIG. 6 , step 4 in FIG. 7 , and step 4 in FIG. 8 ). When the message received by the fourth module is an information query request message, the sixth module may return an information query response message carrying hPCRF information to the visited network.

When the DRA where the seventh module is located is located in the visited network, that is, the seventh module is located in the vDRA, and the vDRA participates in vPCRF selection, the seventh module receives the message directly transmitted by hDRA, or the seventh module receives the message transmitted by hDRA through vPCRF .

The second module can determine whether vPCRF needs to be selected by using the information carried in the message received by the seventh module, as shown in Figure 3, step 5, after the second module determines that the message sent by hDRA is a redirection notification message according to the information carried in the message , it is determined that vPCRF needs to be selected. If the second module determines that vPCRF needs to be selected, then the second module uses the vPCRF information stored in vDRA to determine vPCRF, or the second module selects vPCRF according to a predetermined policy, for example, the second module determines that there is no vPCRF information stored in vDRA. After the information carried in the message received by the seventh module matches the vPCRF, a predetermined policy is used to select the vPCRF. The vPCRF information stored in the DRA may be the correspondence relationship information between the terminal and the vPCRF. The vPCRF information stored in the vDRA can be set through static configuration or dynamic configuration. In a dynamic configuration mode, for example, the second module in the vDRA allocates the vPCRF according to a predetermined policy, and after the allocation is completed, the vDRA stores the allocated vPCRF information.

After the second module determines the PCRF, the third module may return a message carrying the vPCRF information determined by the second module to the network device. When the message received by the seventh module is a redirection notification (such as step 4 in Figure 6 above), the third module may carry the vPCRF information determined by the second module in the redirection notification message, and return the redirection to the network device Notification message (as in step 6 in Figure 3 above).

Although the present invention has been described by way of example, those of ordinary skill in the art know that there are many variations and changes in the present invention without departing from the spirit of the invention, and the claims of the application document of the present invention include these variations and changes.

Claims (16)

1. A method for selecting a policy and charging rule functional entity, comprising: In the roaming scenario, the Diameter routing agent of the home network receives the message transmitted by the visited network; After receiving the message transmitted by the visited network, the home network Diameter routing agent determines the home network PCRF, and returns a message carrying the determined home network PCRF information to the visited network or sends a message to the determined home network The PCRF forwards the message. 2. The method according to claim 1, wherein the message transmitted by the visited network comprises: a query message for obtaining PCRF information or a session establishment request for requesting establishment of a session between the network device and the PCRF; The returned message includes: a query response message corresponding to the query message or a redirect notification corresponding to the session establishment request; the forwarded message includes: the session establishment request. 3. The method according to claim 1, wherein the step of receiving the message transmitted by the visited network by the Diameter routing agent of the home network comprises: The Diameter routing agent in the home network receives the message transmitted by the PCRF of the visited network; or the Diameter routing agent in the home network receives the message transmitted by the Diameter routing agent in the visited network. 4. The method according to claim 3, wherein the step of receiving the message transmitted by the visited network PCRF by the Diameter routing agent of the home network comprises: The visited network Diameter routing agent determines that the visited network PCRF needs to be selected according to the message transmitted by the network device, and the visited network Diameter routing agent determines the visited network PCRF and returns the visited network PCRF information to the network device; The network device sends a message to the visited network PCRF according to the received visited network PCRF information, and the visited network PCRF forwards the received message to the home network Diameter routing agent, or the visited network PCRF generates a new message according to the received message Send to the home network Diameter routing agent; The network device is a network device that needs to establish a session with the home network PCRF. 5. The method according to claim 3, wherein the step of receiving the message transmitted by the visited network PCRF by the Diameter routing agent of the home network comprises: The visited network PCRF receives the message transmitted by the network device and forwards it to the Diameter routing agent in the home network, or generates a new message according to the message transmitted by the network device and sends it to the Diameter routing agent in the home network. 6. The method according to claim 5, wherein the step of receiving, by the visited network PCRF, the message transmitted by the network device and forwarding it to the home network Diameter routing agent comprises: After determining that the destination address of the message transmitted by the network device is the visited network PCRF, and the destination domain name points to the visited network, the visited network PCRF determines the attribution network information according to the user equipment information carried in the message, and modifies the destination domain name of the message transmitted by the network device To point to the home network, and forward to the home network Diameter routing agent. 7. The method according to claim 4 or 5, wherein the step of returning the selected PCRF information to the visited network comprises: The home network Diameter routing agent returns the determined home network PCRF information to the visited network PCRF, and the visited network PCRF uses the home network PCRF information to establish a session. 8. The method of claim 3, wherein, The step of receiving the message transmitted by the Diameter routing agent in the home network from the Diameter routing agent in the visited network includes: After receiving the message transmitted by the network device, the Diameter routing agent of the visited network forwards the received message to the Diameter routing agent of the home network, or the Diameter routing agent of the visited network generates a new message based on the received message and sends it to the Diameter routing agent; The network device is a network device that needs to establish a session with the home network PCRF. 9. The method according to claim 8, wherein the step of returning the selected PCRF information to the visited network comprises: The home network Diameter routing agent returns the determined home network PCRF information to the visited network Diameter routing agent; and the method further includes: The visited network Diameter routing agent determines the visited network PCRF, and transmits the visited network PCRF information and the home network PCRF information to the network device; The network device sends a session establishment request to the visited network PCRF according to the visited network PCRF information and the home network PCRF information, and the visited network PCRF sends a session establishment request to the home network PCRF according to the home network PCRF information carried in the session establishment request to establish a session. 10. The method according to claim 3, wherein the step of receiving the message transmitted by the visited network PCRF by the Diameter routing agent of the home network comprises: The visited network Diameter routing agent determines that PCRF needs to be selected according to the message transmitted by the network device, the visited network Diameter routing agent determines the visited network PCRF, and forwards the message to the visited network PCRF, and the visited network PCRF sends the home network Diameter The routing agent forwards the message; The network device is a network device that needs to establish a session with the home network PCRF. 11. The method according to claim 4, 8 or 10, wherein the message transmitted by the network device includes: a query message for obtaining the PCRF information of the visited network or a request for establishing the PCRF between the network device and the home network The session establishment request of the session between them; the returned message includes: a query response message corresponding to the query message or a redirect notification corresponding to the session establishment request. 12. The method according to claim 4 or 5 or 9 or 10, wherein the step of determining the visited or home network PCRF comprises: The visiting or home network Diameter routing agent determines whether there is matching PCRF information stored; If there is matching PCRF information stored, then determining the matching PCRF information as the visited or home network PCRF; If no matching PCRF information is stored, determine the visited or home network PCRF according to a predetermined policy; When the visited or home network Diameter routing agent determines the visited or home network PCRF according to a predetermined policy, the visited or home network Diameter routing agent stores the determined visited or home network PCRF information. 13. A Diameter routing agent, characterized in that, comprising: The first module is configured to receive a message transmitted by the network device; the message includes: in a roaming scenario and the Diameter tour agent is located in the visited network, the network device establishes a session with the PCRF or the home network PCRF incoming messages; The second module is configured to determine the PCRF or the visited network PCRF according to the stored PCRF information or the predetermined strategy after the first module receives the message transmitted by the network device; The third module is configured to return a message carrying the PCRF or visited network PCRF information determined by the second module to the network device, or forward the information received by the first module to the determined PCRF or visited network PCRF said message. 14. A Diameter routing agent, characterized in that, comprising: The fourth module is configured to receive a message transmitted by the visited network; the message includes: in a roaming scenario, a message transmitted by the visited network during session establishment; The fifth module is used to determine the home network PCRF after the fourth block receives the message transmitted by the visited network; The sixth module is configured to return a message carrying the determined home network PCRF information to the visited network or forward the message received by the fourth module to the determined home network PCRF. 15. Diameter routing agent as claimed in claim 14, is characterized in that, also comprises: The first module is configured to receive a message transmitted by the network device; the message includes: in a non-roaming scenario or in a roaming scenario, the Diameter routing agent where the first module is located is located in the visited network, and the network device is in the same relationship with the PCRF or the home network PCRF Messages transmitted during session establishment; The second module is used to determine the PCRF or visited network PCRF according to the stored PCRF information or predetermined strategy after the first module receives the message transmitted by the network device; The third module is configured to return a message carrying the PCRF or visited network PCRF information determined by the second module to the network device, or forward the information received by the first module to the determined PCRF or visited network PCRF said message. 16. Diameter routing agent as claimed in claim 14, is characterized in that, also comprises: The seventh module receives the message returned by the Diameter routing agent of the home network; The second module is used to determine that the visited network PCRF needs to be selected according to the information carried in the message received by the seventh module when the Diameter routing agent where it is located is located in the visited network and participates in PCRF selection, and then according to the stored PCRF information or The predetermined strategy determines the visited network PCRF; A third module, configured to return a message carrying the PCRF information of the visited network determined by the second module to the network device. the

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