WO2011020419A1 - 控制pcrf实体负载均衡的实现方法、系统及dra - Google Patents

控制pcrf实体负载均衡的实现方法、系统及dra Download PDF

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Publication number
WO2011020419A1
WO2011020419A1 PCT/CN2010/075949 CN2010075949W WO2011020419A1 WO 2011020419 A1 WO2011020419 A1 WO 2011020419A1 CN 2010075949 W CN2010075949 W CN 2010075949W WO 2011020419 A1 WO2011020419 A1 WO 2011020419A1
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Prior art keywords
entity
dra
pcrf
pcrf entity
diameter
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PCT/CN2010/075949
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English (en)
French (fr)
Inventor
周成
周晓云
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中兴通讯股份有限公司
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Publication of WO2011020419A1 publication Critical patent/WO2011020419A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/08Load balancing or load distribution
    • H04W28/088Load balancing or load distribution among core entities
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/10Protocols in which an application is distributed across nodes in the network
    • H04L67/1001Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/10Protocols in which an application is distributed across nodes in the network
    • H04L67/1001Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1036Load balancing of requests to servers for services different from user content provisioning, e.g. load balancing across domain name servers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18Service support devices; Network management devices

Definitions

  • the communication field of the present invention in particular, a method and a system for implementing load balancing of a Policy and Charging Rules Function (PCRF), and a Diameter Routing Agent (DRA).
  • PCRF Policy and Charging Rules Function
  • DAA Diameter Routing Agent
  • the EPS of the 3rd Generation Partnership Project (3GPP) consists of the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), the Mobility Management Entity (MME), and the service.
  • Gateway Single Gateway, S-GW), Packet Network Network Gate (P-GW), Home Subscriber Server (HSS), 3GPP Authentication, Authorization, Accounting, AAA , PCRF entity and other supporting nodes.
  • the S-GW is an access gateway device connected to the E-UTRAN, and forwards data between the E-UTRAN and the P-GW, and is responsible for buffering paging waiting data;
  • the P-GW is an EPS and a packet data network.
  • the border gateway of the Packet Data Network is responsible for accessing the PDN and forwarding data between the EPS and the PDN.
  • the PCRF entity obtains service information through an interface between the Rx interface and the operator's Internet Protocol (IP) service network.
  • IP Internet Protocol
  • it is connected to the gateway device in the network through the Gx/Gxa/Gxc interface, and is responsible for initiating the establishment of the IP bearer, guaranteeing the quality of service (QoS) of the service data, and performing charging control.
  • QoS quality of service
  • the Policy and charging enforcement function (PCEF) entity exists in the P-GW.
  • the PCRF entity can complete all functions control by connecting with the P-GW.
  • the PCRF entity and The P-GW exchanges information through the Gx interface.
  • PMIP Proxy Mobile IP
  • BBERF Bearer Binding and Event Report Function
  • S- The GW and the PCRF entity exchange information through the Gxc interface.
  • the trusted non-3GPP network accesses the trusted non-3GPP access gateway also resides in the BBERF entity, and the trusted non-3GPP network access gateway and the PCRF entity exchange information through the Gxa interface.
  • the S9 interface serves as the interface between the home PCRF entity and the visited PCRF entity. Meanwhile, the application function (AF) entity that provides the service for the UE is sent to the PCRF entity through the Rx+ interface.
  • PCC Policy and Charging Control
  • the Diameter protocol is designed to provide authentication, authorization, and accounting structures for applications such as network access or IP mobility, and is improved by the Remote Authentication Dial In User Service (RADIUS) protocol.
  • RADIUS Remote Authentication Dial In User Service
  • PCRF entity nodes there are multiple PCRF entity nodes in a Public Land Mobile Network (PLMN) of EPS, and all PCRF entity nodes belong to one or more Diameter (PCRF) domains, in the same Diameter (PCRF) domain. All PCRF entities have the same capabilities.
  • PLMN Public Land Mobile Network
  • PCRF Diameter
  • PCRF Diameter
  • All PCRF entities have the same capabilities.
  • a UE-to-PDN network connection is called an IP Connectivity Access Network (IP-CAN) session.
  • IP-CAN IP Connectivity Access Network
  • the EPS introduces a logical functional module in each Diameter (PCRF) domain, ie Diameter Diameter Routing Agent (DRA), as shown in Figure 1, 2, and 3, where Figure 1 is the roaming architecture diagram of the EPS route of the home, and Figure 2 is the local grooming of the EPS and the IP service provided by the home network operator.
  • the roaming architecture diagram, Figure 3 is a roaming architecture diagram of the EPS localization and the IP network service provided by the visited network operator.
  • the DRA selects a PCRF entity for the IP-CAN session, and the PCEF entity, the BBERF entity, and the AF entity associated with the IP-CAN session are collectively referred to as a client. , is associated with the selected PCRF entity by the DRA.
  • the PCEF entity, the BBERF entity, and the AF entity respectively establish a Diameter session with the selected PCRF entity, and transmit policies and service information for controlling the IP-CAN session through these Diameter sessions.
  • the DRA maintains information that uniquely identifies the IP-CAN session and the corresponding PCRF entity identity or IP address, identifying the IP-CAN session.
  • the information includes the NAI of the UE, the IP address of the UE, and the APN to which the UE accesses the PDN.
  • the information about the Diameter session established by the PCEF entity, the BBERF entity, or the AF entity and the PCRF entity may be saved in the DRA, such as the session identifier of the established Diameter session. This allows the DRA to know which Diameter session it manages for the IP-CAN session.
  • the DRA may delete the information of the Diameter session (such as the session identifier).
  • the DRA deletes all Diameter sessions managed by an IP-CAN session, the DRA deletes all information for that IP-CAN session.
  • DRA DRA
  • (1) Redirect mode When the PCEF entity, the BBERF entity, and the AF entity send a Diameter Session Establishment Request message to the PCRF entity, the message is first sent to the DRA. If the DRA does not already have this IP-CAN session related information, the DRA will select a PCRF entity for this IP-CAN session. The identifier or address of the selected PCRF entity is returned to the sender. If there is already information related to this IP-CAN session in the DAR, the DRA returns the identity or address of the corresponding PCRF entity to the sender. After the sender obtains the address or identifier of the PCRF entity, it sends a Diameter session establishment request message to the selected PCRF entity.
  • the proxy DRA selects the PCRF entity when creating the DRA binding, which is random, and does not guarantee load balancing between the respective PCRF entities. Without changing the existing architecture, a method is needed to enable the DRA to obtain PCRF physical load information, calculate dynamic load factors, and regulate PCRF physical load balancing. Summary of the invention
  • the technical problem to be solved by the present invention is to provide an implementation method and an implementation system for controlling the load balancing of the PCRF entity to implement load balancing of the PCRF entity.
  • the present invention provides an implementation method for controlling physical load balancing of a PCRF, the method comprising:
  • Diameter routing agent DRA from the DRA binding point to the policy and charging rule function PCRF entity obtains the current load status information of the PCRF entity;
  • the PCRF entity selection step the DRA selects a lower load PCRF entity for the newly created diameter session according to the current load state information of all the PCRF entities obtained.
  • the method further includes: creating, verifying, or deleting the DRA binding step, where the step of creating, verifying, or deleting the DRA binding includes:
  • the DRA sends a Diameter session message to the PCRF entity, where the Diameter session message carries a query indication of the status of the PCRF entity;
  • the PCRF entity After receiving the query indication, the PCRF entity returns a response message to the DRA, where the response message carries current load status information of the PCRF entity;
  • the DRA receives the response message, and obtains current load status information of the PCRF entity.
  • the DRA is configured to query a timer of each PCRF entity or all the PCRF entities.
  • the method further includes the entity status query indication, and carries the identifier in the Diameter session message.
  • the PCRF entity status query indication after receiving the response message sent by the PCRF entity, the DRA restarts the query timer of the PCRF entity.
  • the DRA After receiving the response message, the DRA deletes the load status information in the response message, and then forwards the information to the network element related to the diameter session, where the related network element includes policy and charging execution.
  • Function PCEF entity bearer binding and event reporting function BBERF entity or application function AF entity network element.
  • the Diameter session message is a Diameter session request message and a Diameter session update message. Message, or Diameter session termination message.
  • the method is applicable to roaming scenes and non-roaming scenes.
  • the present invention further provides an implementation system for controlling PCRF physical load balancing, the system includes a connected Diameter routing proxy DRA and a plurality of PCRF entities, where: the DRA includes a connected information processing module, a PCRF entity selection module and a messaging module connected to the information processing module, where
  • the information processing module is configured to: insert a load status query indication into the diameter message sent by the PCRF entity pointed to by the DRA binding, and parse the current load status information returned by the PCRF entity;
  • the PCRF entity selection module is configured to: use a dynamic load balancing algorithm to direct the newly created diameter session to a lower load PCRF entity according to the obtained current load state information of all PCRF entities;
  • the messaging module is configured to: send a diameter message to the PCRF entity and receive a response message returned by the PCRF entity;
  • the PCRF entity is configured to: receive a diameter message sent by the DRA, and return a response message carrying the current load status information to the DRA according to the load status query indication.
  • the DRA further includes a timing module connected to the information processing module,
  • the timing module is configured to: notify the information processing module when the timing time arrives; the information processing module is further configured to: determine that the timer expires, and the PCRF entity status query is not sent to the PCRF entity within the timing period and after the timeout period When the indication is received, the PCRF entity status query indication is carried in the Diameter message; after receiving the response message sent by the PCRF entity, the timing module is restarted.
  • the information processing module is further configured to: delete the current load status information from the response message returned by the PCRF entity,
  • the message sending and receiving module is further configured to: send or receive a diameter message to the diameter session related network element;
  • the related network element includes a policy and charging execution function PCEF entity, a bearer binding, and an event reporting function, a BBERF entity or an application function AF entity.
  • the information processing module is configured to: insert the load status query indication in a Diameter session request, update, or termination message sent to the PCRF entity;
  • the PCRF entity is configured to send its own current load status information to the DRA through a response message.
  • the present invention also provides a Diameter Routing Agent (DRA), wherein the DRA includes a connected information processing module, a policy and charging rule function (PCRF) entity selection module, and a message transceiving module connected to the information processing module, wherein ,
  • DRA Diameter Routing Agent
  • PCRF policy and charging rule function
  • the information processing module is configured to: insert a load status query indication into the diameter message sent by the PCRF entity pointed to by the DRA binding, and parse the current load status information returned by the PCRF entity;
  • the PCRF entity selection module is configured to: use a dynamic load balancing algorithm to direct the newly created diameter session to a lower load PCRF entity according to the obtained current load state information of all PCRF entities;
  • the message sending and receiving module is configured to: send a diameter message to the PCRF entity, and receive a response message returned by the PCRF entity; the response message is returned by the PCRF entity to the DRA according to the load status query indication, and carries the PCRF The current load status information of the entity.
  • the DRA further includes a timing module connected to the information processing module,
  • the timing module is configured to: notify the information processing module when the timing time arrives; the information processing module is further configured to: determine that the timer expires, and the PCRF entity status query is not sent to the PCRF entity within the timing period and after the timeout period When the indication is received, the PCRF entity status query indication is carried in the Diameter message; after receiving the response message sent by the PCRF entity, the timing module is restarted.
  • the information processing module is further configured to: delete the current load status information from the response message returned by the PCRF entity,
  • the messaging module is further configured to: send or receive a diameter message to a diameter session related network element; the related network element includes a policy and charging execution function (PCEF) entity, a bearer binding and event reporting function (BBERF) entity or Application Function (AF) Entity NE.
  • PCEF policy and charging execution function
  • BBERF bearer binding and event reporting function
  • AF Application Function
  • the information processing module is configured to: insert the load status query indication in a Diameter session request, update or termination message sent to the PCRF entity.
  • the method and system of the present invention obtains the current load state information of the PCRF entity by the DRA, and obtains the free capacity ratio of all PCRF entities according to the dynamic algorithm, and directs the newly created diameter session to the PCRF entity with lower load, thereby realizing the DRA. Load balancing between multiple PCRF entities under control.
  • Figure 1 is a roaming architecture diagram of EPS's home route
  • FIG. 2 is a roaming architecture diagram of IP localization provided by the home network operator of the EPS
  • FIG. 3 is a roaming architecture diagram of the IP service provided by the local network operator and the visited network operator
  • FIG. 4 is a diagram of controlling the PCRF physical load of the present invention.
  • FIG. 5 is a flowchart of Embodiment 2 of a method for controlling load balancing of a PCRF entity according to the present invention
  • FIG. 6 is a flowchart of Embodiment 3 of a method for controlling load balancing of a PCRF entity according to the present invention
  • FIG. 7 is a flowchart of Embodiment 4 of a method for controlling load balancing of a PCRF entity according to the present invention
  • FIG. 5 is a flowchart of Embodiment 2 of a method for controlling load balancing of a PCRF entity according to the present invention
  • FIG. 6 is a flowchart of Embodiment 3 of a method for controlling load balancing of a
  • FIG. 8 is a flowchart of Embodiment 5 of a method for controlling load balancing of a PCRF entity according to the present invention
  • FIG. 9 is a flow chart for controlling a PCRF physical load according to the present invention
  • FIG. 10 is a schematic diagram of an implementation system for controlling PCRF physical load balancing according to the present invention. Preferred embodiment of the invention
  • the method for controlling the load balancing of the PCRF entity of the present invention comprises the following steps:
  • the Diameter routing agent DRA obtains the current load status information of the PCRF entity from the PCRF entity pointed to by the DRA binding;
  • the PCRF entity selection step the DRA obtains the free capacity ratio of all the PCRF entities according to the current load state information of all the PCRF entities obtained, and directs the newly created diameter session to the PCRF entity with lower load.
  • the foregoing information collection step is performed after the DRA binding is created, verified, or deleted, and may be obtained by sending a separate message to the PCRF entity.
  • the present invention recommends not changing the existing architecture.
  • the implementation of the method includes: sending, by the DRA, a Diameter session request, an update, or a termination message to the PCRF entity, where the PCRF entity status query indication is sent; after receiving the query indication, the PCRF entity returns a response message to the DRA. And carrying the current load status information of the PCRF entity; the DRA receiving the response message, and acquiring current load status information of the PCRF entity.
  • the DRA can be configured to query the timers of the PCRF entities or all the PCRF entities to periodically trigger the DRA to query the load status of a PCRF entity.
  • the DRA sends the Diameter session request, update, or termination message to the PCRF entity, when the timer expires and the PCRF entity status query indication is not sent to the PCRF entity within the timing period and after the timeout, the Diameter is The session request, the update, or the termination message carries the PCRF entity status query indication.
  • the DRA restarts the query timer of the PCRF entity.
  • the DRA only acts as a forwarding function and does not perform any processing or analysis on the diameter message.
  • the DRA needs to insert a PCRF entity status query indication when forwarding each new/modify/terminate diameter session request message, and parse the response message replied by each PCRF entity to obtain the PCRF entity status. information.
  • the DRA After receiving the response message, the DRA deletes the load status information and forwards the information to the network element such as a PCEF entity, a BBERF entity, or an AF entity related to the diameter session.
  • the network element such as a PCEF entity, a BBERF entity, or an AF entity related to the diameter session.
  • the technical solution provided by the present invention implements a BBERF entity in a roaming or non-roaming scenario
  • load balancing between multiple PCRF entities can be implemented by DRA.
  • the embodiment considers the following scenarios: (1) In a non-roaming scenario, the proxy DRA controls the low-load PCRF entity to establish a diameter session, as in the first embodiment; (2) in the roaming scenario, the proxy DRA controls the low-load PCRF entity to establish a diameter session. For example, in the non-roaming scenario, the proxy DRA obtains the PCRF entity load state information in the process of terminating the dialog session, as in the third embodiment; (4) in the roaming scenario, the proxy DRA obtains the PCRF entity in the process of terminating the diameter session.
  • the proxy DRA obtains the PCRF entity load status information, as in the fifth embodiment; (6) the modified dialog session initiated by the V-PCRF in the roaming scenario, and the roxy DRA obtains the PCRF entity load status information, as in the sixth embodiment.
  • the PCEF entity, BBERF entity, and AF entity are collectively referred to as client in the following process.
  • Step 401 The client of the proxy DRA receives an external trigger (for example, an IP-CAN session establishment request), and needs to establish a diameter session with the PCRF entity;
  • an external trigger for example, an IP-CAN session establishment request
  • Step 402 The client sends a diameter establishment request with user information (such as UE-NAI) to the proxy DRA.
  • user information such as UE-NAI
  • Step 403 The DRA saves the user information and checks whether there is currently a DRA binding corresponding to the user. If it does not exist, DRA will create a dynamic DRA binding (ie assign one PCRF entity to each UE or each IP-CAN). The DRA assigns the PCRF entity to select the PCRF entity with the lowest load based on the load ratio of each PCRF entity in the network. In this embodiment, the DRA selects the PCRF entity -1;
  • Step 404 The proxy DRA forwards the diameter request message to the PCRF entity -1.
  • the DRA should also add a PCRF entity status query indication to the diameter request message;
  • Step 405 Detect the status query indication in the diameter request message, and the PCRF entity-1 returns a diameter response message (including the current status information of the PCRF entity -1, such as idle capacity, etc.) to the DRA;
  • Step 406 The Proxy DRA parses the diameter response message of step 405, obtains the status information of the PCRF entity -1, and deletes the part from the message, and then forwards the message to the client. DRA restarts the status query timer of the PCRF entity -1;
  • Step 407 If PA2 is configured, the client may store the address of the PCRF entity-1. And the subsequent diameter session message is skipped to the PCR DRA and sent directly to the PCRF entity-1.
  • the configuration of the PA2, that is, the DRA sends the acknowledgment message returned by the PCRF entity to the PCEF entity, the BBERF entity or the AF entity. .
  • the PCEF entity, BBERF entity or AF entity interacts directly with the PCRF entity without going through the DRA.
  • the DRA updates the load information of the PCRF entity -1, and then calculates the relative idle ratio of the PCRF entity according to the load status of all PCRF entities in the network, and selects the PCRF entity with lower load for the diameter session of the newly created IP-CAN session.
  • This embodiment describes a signaling procedure in which a visited PCRF entity locates a home PCRF entity via a home proxy DRA, and establishes a signaling session of the diameter session, wherein the DRA obtains the PCRF entity load information and controls the establishment of the diameter session to the PCRF entity with a lower load.
  • each step is described as follows:
  • Step 501 The visited V-PCRF entity receives an external trigger (for example, a session establishment request on the s9 interface), and needs to establish a diameter session with the home H-PCRF entity;
  • an external trigger for example, a session establishment request on the s9 interface
  • Step 502 The V-PCRF entity sends a diameter establishment request with user information (such as UE-NAI) to the home H-DRA.
  • user information such as UE-NAI
  • Step 503 The H-DRA saves the user information and checks whether there is currently a DRA binding corresponding to the user. If it does not exist, DRA will create a dynamic DRA binding (ie assign one PCRF entity to each UE or each IP-CAN). The H-DRA assigns the PCRF entity to select the PCRF entity with the lowest load based on the load ratio of each PCRF entity in the home network. In this embodiment, the H-DRA selects the H-PCRF entity -1;
  • Step 504 The proxy H-DRA forwards the diameter request message to the H-PCRF entity -1.
  • the H-DRA shall also add a PCRF entity status query indication to the diameter request message.
  • Step 505 Detect the status query indication in the diameter request message, and the H-PCRF entity-1 returns a diameter response message to the H-DRA (including the current status information of the H-PCRF entity-1, such as Free capacity, etc.);
  • Step 506 The H-DRA parsing step 505 of the diameter response message acquires the status information of the H-PCRF entity -1, and deletes the part from the message, and then forwards the message to the V-PCRF entity. H-DRA restarts the state query timer of the H-PCRF entity-1;
  • Step 507 If PA2 is configured, the V-PCRF entity may store the address of the H-PCRF entity -1, and skip the subsequent diameter session message to the proxy DRA and directly send it to the H-PCRF entity -1;
  • the H-DRA updates the load information of the H-PCRF entity-1, and then calculates the relative idle ratio of the PCRF entity according to the load status of all PCRF entities in the home network, and selects a lower load for the diameter session of the newly created IP-CAN session. PCRF entity.
  • This example describes the process of the client DRA client terminating the session.
  • the DRA obtains the load information of the PCRF entity through the client.
  • This embodiment is also applicable to the scenario where the visited client terminates the diameter session by visiting the DRA. As shown in Figure 6, the description of each step is as follows:
  • Step 601 The client of the proxy DRA receives an external trigger (for example, an IP-CAN session termination request initiated by the UE or the PCRF entity), and needs to terminate the diameter session with the PCRF entity;
  • an external trigger for example, an IP-CAN session termination request initiated by the UE or the PCRF entity
  • Step 602 The client sends a diameter termination request to the proxy DRA, and the message uses the same Session-ID AVP (session identification ID) as the established diameter session between the client and the PCRF entity-1.
  • Session-ID AVP session identification ID
  • Step 603 By checking the Session-ID AVP of the message of step 602, the Proxy DRA verifies that there is a DRA binding for the IP-CAN session (pointing to the PCRF entity -1);
  • Step 604 The proxy DRA forwards the radius termination request message to the PCRF entity-1.
  • the DRA should also add a PCRF entity status query indication to the diameter termination request message;
  • Step 605 Detect a status query indication in the diameter termination request message, the PCRF entity -1 terminates the corresponding session and returns a diameter response message to the DRA (including the current state information of the PCRF entity-1, such as idle capacity, etc.);
  • Step 606 The Proxy DRA marks the diameter session as terminated. If the DRA binding is created for each IP-CAN session, and all the diameter sessions under the IP-CAN session have been terminated, or created for each UE if the DRA is bound, and all of the UE's diameters The session has been terminated, then the DRA binding will be deleted;
  • Step 607 The DRA parses the diameter response message of step 605, obtains the state information of the PCRF entity -1, and deletes the part from the message, and then forwards the message to the client. DRA restarts the status query timer of the PCRF entity -1.
  • the proxy DRA updates the load information of the PCRF entity -1, and then calculates the relative idle ratio of the PCRF entity according to the load status of all PCRF entities in the network, and selects the PCRF entity with lower load for the diameter session of the newly created IP-CAN session.
  • Step 701 The visited V-PCRF entity receives an external trigger (for example, a session termination request requested by a BBERF entity or a PCEF entity), and needs to terminate the diameter session with the home H-PCRF entity;
  • Step 702 The V-PCRF entity sends a diameter termination request to the home proxy H-DRA, and the message uses the same Session-Id AVP as the established diameter session between the client and the PCRF entity-1;
  • Step 703 By checking the Session-ID AVP of the message of step 702, the H-DRA verifies that there is a DRA binding for the IP-CAN session (pointing to the H-PCRF entity -1);
  • Step 704 The H-DRA forwards the radius termination request message to the target H-PCRF entity -1. At this time, if the query timer of the H-PCRF entity-1 in the H-DRA has timed out, and the H-DRA has not issued the query request, the H-DRA shall also add a PCRF entity status query indication in the diameter termination request message;
  • Step 705 Detect the status query indication in the diameter termination request message, H-PCRF Body -1 terminates the corresponding session and returns an S9 diameter response message to the H-DRA (including current status information of the H-PCRF entity-1, such as free capacity, etc.);
  • Step 706 The H-DRA marks the corresponding diameter session as terminated. If the UE's diameter session has been terminated, the DRA binding will also be deleted;
  • Step 707 The S9 diameter response message of the H-DRA parsing step 705 obtains the status information of the H-PCRF entity -1, and deletes the part from the message, and then forwards the message to the V-PCRF entity of the visited place. H-DRA restarts the status query timer of H-PCRF entity -1.
  • the proxy H-DRA updates the load information of the H-PCRF entity-1, and then calculates the relative idle ratio of the PCRF entity according to the load status of all PCRF entities in the home network, and selects the load for the diameter session of the newly created IP-CAN session. Low PCRF entity.
  • This embodiment describes the signaling process of modifying the diameter session by performing PA1 in the non-roaming scenario (that is, the client always interacts with the PCRF entity through the proxy DRA).
  • This embodiment is also applicable to the scene where the visiting client modifies the diameter session through the visited DRA. As shown in Figure 8, the steps are described as follows:
  • Step 801 The client of the proxy DRA receives an external trigger (for example, an IP-CAN session modification request), and needs to send a modified diameter request message to the corresponding PCRF entity;
  • an external trigger for example, an IP-CAN session modification request
  • Step 802 The client sends a modify diameter request message to the proxy DRA.
  • Step 803 The Proxy DRA verifies that there is a step 802 requesting the DRA binding associated with the session.
  • Step 804 The DRA forwards the diameter request message to the target PCRF entity -1.
  • the DRA should also add a PCRF entity status query indication to the diameter request message;
  • Step 805 The status query indication in the diameter request message is detected, and the PCRF entity-1 returns a diameter response message (including current status information of the PCRF entity -1, such as idle capacity, etc.) to the DRA;
  • Step 806 The DRA parses the diameter response message of step 805 to obtain the PCRF entity-1. Status information, and remove this part from the message, and then forward the message to the client. The DRA restarts the status query timer of the PCRF entity-1.
  • the proxy DRA updates the load information of the PCRF entity -1, and then calculates the relative idle ratio of the PCRF entity according to the load status of all PCRF entities in the network, and selects the PCRF entity with lower load for the diameter session of the newly created IP-CAN session.
  • the PA1 is performed, and the visited V-PCRF entity interacts with the home H-PCRF entity through the home proxy H-DRA to modify the signaling process of the diameter session.
  • the steps are described as follows:
  • Step 901 The V-PCRF entity receives an internal or external trigger, and needs to send a diameter message to the home PCRF entity on the S9 interface.
  • Step 902 The V-PCRF entity sends a message of a diameter session update (for example, an S9 session modification request) on the S9 interface, and is received by the local proxy H-DRA.
  • a diameter session update for example, an S9 session modification request
  • Step 903 The Proxy H-DRA verifies that there is a DRA binding associated with the session requested in step 902 (pointing to the H-PCRF entity -1);
  • Step 904 The H-DRA forwards the diameter session update message to the target H-PCRF entity -1. At this time, if the query timer of the H-PCRF entity-1 in the H-DRA has timed out, and the H-DRA has not issued the query request, the H-DRA shall also add a PCRF entity status query indication in the diameter session update message;
  • Step 905 Detecting the status query indication in the diameter session update message, the H-PCRF entity -1 returns a diameter response message (including the current status information of the H-PCRF entity -1, such as idle capacity, etc.) to the H-DRA;
  • Step 906 The H-DRA parses the diameter response message of step 905, obtains the state information of the H-PCRF entity -1, and deletes the part from the message, and then forwards the message to the V-PCRF entity of the visited place. H-DRA restarts the status query timer of H-PCRF entity -1.
  • the proxy H-DRA updates the load information of the H-PCRF entity-1, and then calculates the relative idle ratio of the PCRF entity according to the load status of all PCRF entities in the home network.
  • the diameter session of the IP-CAN session selects the lower load PCRF entity.
  • the present invention further provides an implementation system for controlling physical load balancing of a PCRF.
  • the system includes a connected Diameter routing agent DRA100 and a plurality of PCRF entities 101, wherein:
  • the DRA 100 includes a connected information processing module 1001, a PCRF entity selection module 1002, a timing module 1003 connected to the information processing module, and a messaging module 1004 connected to the information processing module, where
  • the information processing module 1001 is configured to insert a load status query indication into the diameter message sent by the PCRF entity 101 directed to the DRA 100 binding, parse the current load status information returned by the PCRF entity 101, and delete the PCRF entity load status from the PCRF entity 101.
  • the information processing module 1001 inserts the load status query indication in a Diameter session request, update or termination message sent to the PCRF entity 101, and the PCRF entity 101 sends current load status information to the DRA 100 through a response message.
  • the PCRF entity selection module 1002 is configured to apply a dynamic load balancing algorithm according to the current load state information of all PCRF entities obtained, and direct the newly created diameter session to the PCRF entity with low load.
  • the module defaults all the PCRF entities to zero load;
  • the timing module 1003 is configured to notify the information processing module 1001 when the timing time arrives, and the information processing module 1001 determines that the timer expires and the timing period
  • the PCRF entity status query indication is carried in the Diameter request, update, or termination session message when the PCRF entity status query indication is not sent to the PCRF entity 101, and is also used to receive the PCRF entity sending After the response message, the timing module 1003 is restarted.
  • the message sending and receiving module 1004 is configured to send or receive a diameter message to a diameter session related network element and a PCRF entity, where the network element includes a policy and charging execution function PCEF entity, a bearer binding, and an event reporting function BBERF entity, and the application function AF Physical network element.
  • the network element includes a policy and charging execution function PCEF entity, a bearer binding, and an event reporting function BBERF entity, and the application function AF Physical network element.
  • the PCRF entity 101 is configured to receive a diameter message sent by the DRA, and return a response message carrying the current load status information to the DRA according to the load status query indication therein.
  • the present invention also provides a Diameter Routing Agent (DRA), wherein the DRA includes a connected information processing module, a policy and charging rule function (PCRF) entity selection module, and a message transceiving module connected to the information processing module, wherein ,
  • DRA Diameter Routing Agent
  • PCRF policy and charging rule function
  • the information processing module is configured to: insert a load status query indication into the diameter message sent by the PCRF entity pointed to by the DRA binding, and parse the current load status information returned by the PCRF entity;
  • the PCRF entity selection module is configured to: use a dynamic load balancing algorithm to direct the newly created diameter session to a lower load PCRF entity according to the obtained current load state information of all PCRF entities;
  • the message sending and receiving module is configured to: send a diameter message to the PCRF entity, and receive a response message returned by the PCRF entity; the response message is returned by the PCRF entity to the DRA according to the load status query indication, and carries the PCRF The current load status information of the entity.
  • the DRA further includes a timing module connected to the information processing module,
  • the timing module is configured to: notify the information processing module when the timing time arrives; the information processing module is further configured to: determine that the timer expires, and the PCRF entity status query is not sent to the PCRF entity within the timing period and after the timeout period When the indication is received, the PCRF entity status query indication is carried in the Diameter message; after receiving the response message sent by the PCRF entity, the timing module is restarted.
  • the information processing module is further configured to: delete the current load status information from the response message returned by the PCRF entity,
  • the messaging module is further configured to: send or receive a diameter message to a diameter session related network element; the related network element includes a policy and charging execution function (PCEF) entity, a bearer binding and event reporting function (BBERF) entity or Application Function (AF) Entity NE.
  • PCEF policy and charging execution function
  • BBERF bearer binding and event reporting function
  • AF Application Function
  • the information processing module is configured to: insert the load status query indication in a Diameter session request, update or termination message sent to the PCRF entity.
  • the method and system of the present invention obtains the current load state information of the PCRF entity by the DRA, and obtains the free capacity ratio of all PCRF entities according to the dynamic algorithm, and directs the newly created diameter session to the PCRF entity with lower load, thereby realizing the DRA.
  • the method and system of the present invention obtains the current load state information of the PCRF entity by the DRA, and obtains the free capacity ratio of all PCRF entities according to the dynamic algorithm, and directs the newly created diameter session to the PCRF entity with lower load, thereby realizing the DRA. Load balancing between multiple PCRF entities under control.

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Abstract

本发明公开了一种控制策略和计费规则功能(PCRF)实体负载均衡的实现方法,该方法包括:信息收集步骤,Diameter路由代理(DRA)从DRA绑定指向的策略和计费规则功能(PCRF)实体获取所述PCRF实体当前负载状态信息; 以及PCRF实体选择步骤, 所述DRA根据获取的所有PCRF实体当前负载状态信息,为新建的diameter会话选择负载较低的PCRF实体。本发明还公开了相应系统及DRA。本发明实现了在DRA调控下实现多个PCRF实体之间的负载均衡。

Description

控制 PCRF实体负载均衡的实现方法、 系统及 DRA
技术领域
本发明通信领域, 尤其是一种控制策略和计费规则功能 (Policy and Charging Rules Function, PCRF ) 实体负载均衡的实现方法、 系统及 Diameter 路由代理(DRA ) 。
背景技术
第三代合作伙伴计划 ( 3rd Generation Partnership Project, 3GPP ) 的 EPS 由演进的通用地面无线接入网 (Evolved Universal Terrestrial Radio Access Network, E-UTRAN )、移动管理实体( Mobility Management Entity, MME ) 、 服务网关 ( Serving Gateway, S-GW ) 、 数据网络网关 (Packet Data Network GateWay, P-GW)、 归属用户服务器( Home Subscriber Server, HSS ) 、 3GPP 认证授权计费( Authentication、 Authorization、 Accounting , AAA )服务器, PCRF 实体及其他支撑节点组成。其中, S-GW是与 E-UTRAN相连的接入网关设备, 在 E-UTRAN和 P-GW之间转发数据, 并且负责对寻呼等待数据进行緩存; P-GW则是 EPS与分组数据网( Packet Data Network , PDN )的边界网关, 负 责 PDN的接入、 在 EPS与 PDN间转发数据等; PCRF实体通过 Rx接口与运 营商互联网协议(Internet Protocol, IP )业务网络接口, 获取业务信息, 另一 边它通过 Gx/Gxa/Gxc接口与网络中的网关设备相连, 负责发起 IP承载的建 立, 保证业务数据的服务质量(Quality of Service, QoS ) , 并进行计费控制。
EPS之间的 3GPP 网络中, 策略和计费执行功能 (Policy and charging enforcement function, PCEF ) 实体存在于 P-GW中, PCRF实体只要与 P-GW 连接即可完成所有功能的控制, PCRF实体与 P-GW间通过 Gx接口交换信息。 当 P-GW与 S-GW间的接口基于代理移动 IP( Proxy Mobile IP, PMIP )时, S-GW 中存在承载绑定和事件报告功能 ( Bearer Binding and Event Report Function, BBERF ) 实体, S-GW与 PCRF实体之间通过 Gxc接口交换信息。 当可信任 非 3GPP网络接入时, 可信任非 3GPP接入网关中也驻留 BBERF实体, 可信 任非 3GPP网络接入网关与 PCRF实体之间通过 Gxa接口交换信息。 用户设 备( User Equipment, UE ) 漫游时 , S9接口作为归属地 PCRF实体和拜访地 PCRF实体的接口, 同时, 为 UE提供业务的应用功能 (Application Function, AF)实体通过 Rx+接口向 PCRF实体发送用于生成策略计费控制 (Policy and Charging Control, PCC )策略的业务信息。
Diameter协议是为诸如网络访问或 IP移动等应用程序提供认证, 授权 和计费结构所设计的 ,由远程用户拨号认证系统( Remote Authentication Dial In User Service, RADIUS )协议改进而来。
EPS的一个公共陆地移动电话网 ( Public Land Mobile Network, PLMN ) 中存在多个 PCRF 实体节点, 并且所有的 PCRF 实体节点属于一个或多个 Diameter (PCRF)域, 同一个 Diameter ( PCRF )域中的所有 PCRF实体具有 相同的能力。 一个 UE 到 PDN 网络的连接称为一个 IP 连接接入网 (IP Connectivity Access Network, IP-CAN )会话。 一个 IP-CAN会话的 PCC策略 只由一个 PCRF决定。为了确保一个 IP-CAN会话相关的所有 PCEF或 BBERF 以及为这个 IP-CAN会话提供业务的 AF都关联到同一个 PCRF, EPS在每个 Diameter ( PCRF ) 域中引入了一个逻辑功能模块, 即 Diameter路由代理 ( Diameter Routing Agent, DRA ) , 如图 1、 2、 3所示, 其中, 图 1为 EPS 的家乡路由的漫游架构图, 图 2为 EPS的本地疏导并家乡网络运营商提供 IP 业务的漫游架构图,图 3为 EPS的本地疏导并拜访地网络运营商提供 IP业务 的漫游架构图。
UE要建立到一个 PDN的 IP-CAN会话时, 由 DRA为这个 IP-CAN会话 选择一个 PCRF实体, 与这个 IP-CAN会话相关的 PCEF实体、 BBERF实体 和 AF实体, 统称为客户端( client ) , 由 DRA来关联到所选择的 PCRF实体 上。 PCEF实体、 BBERF实体和 AF实体分别与选中的 PCRF实体建立 Diameter 会话, 并通过这些 Diameter会话传送对 IP-CAN会话进行控制的策略和业务 信息等。 为了确保 DRA正确地将 PCEF实体、 BBERF实体和 AF实体关联到 一个 PCRF实体, DRA要保存能够唯一标识这个 IP-CAN会话相关的信息和 对应的 PCRF实体标识或者 IP地址, 标识 IP-CAN会话的信息有 UE的 NAI, UE的 IP地址以及 UE要接入 PDN的 APN等。 当同一个 IP-CAN会话的 PCEF 实体、 BBERF实体和 AF实体在建立与 PCRF实体的 Diameter会话时,向 DRA 提供这些信息, DRA查找保存的信息,就可以为其选择同一个 PCRF实体了。 DRA中可以保存 PCEF实体、 BBERF实体或 AF实体与 PCRF实体建立的 Diameter会话的信息,如建立的 Diameter会话的会话标识等。这样 DRA就能 知道它为 IP-CAN会话所管理的 Diameter会话。 当 PCEF实体、 BBERF实体 或 AF实体与 PCRF实体建立的 Diameter会话删除时, PCEF实体、 BBERF 实体或 AF实体要通知 DRA该 Diameter删除, DRA可以删除该 Diameter会 话的信息(如会话标识)。当 DRA为某个 IP-CAN会话管理的所有的 Diameter 会话删除后, DRA将删除该 IP-CAN会话的所有信息。
DRA具体实现可以有三种方式:
( 1 ) Redirect方式。 当 PCEF实体、 BBERF实体和 AF实体向 PCRF实 体发送 Diameter会话建立请求消息时, 该消息首先被发送给 DRA。 若 DRA 还没有这个 IP-CAN会话相关的信息时, DRA会为这个 IP-CAN会话选择一 个 PCRF实体。并将所选择的 PCRF实体的标识或地址返回给发送方。若 DAR 中已经有这个 IP-CAN会话相关的信息, 则 DRA将对应的 PCRF实体的标识 或地址返回给发送方。 发送方获得 PCRF实体的地址或标识后再向所选择的 PCRF实体发送 Diameter会话建立请求消息。
( 2 ) Proxy方式。 当 PCEF实体、 BBERF实体和 AF实体向 PCRF实体 发送 Diameter会话建立请求消息时, 该消息首先被发送给 DRA。 若 DRA还 没有这个 IP-CAN会话相关的信息时, DRA会为这个 IP-CAN会话选择一个 PCRF实体, 并将该消息转发给所选择的 PCRF实体。 若 DRA中已经有这个 IP-CAN会话相关的信息, 则 DRA将该消息转发给对应的 PCRF实体。 PCRF 实体的确认消息也通过 DRA转发给 PCEF实体、 BBERF实体或 AF实体。
( 3 ) Proxy方式的变形。 与 Proxy方式类似, 不同点在于 DRA在转发 PCRF实体返回的确认消息时会把 PCRF实体的地址也发送给 PCEF实体、 BBERF实体或 AF实体。 这样在随后的消息交互中, PCEF实体、 BBERF实 体或 AF实体可以直接与 PCRF实体交互而不需要经过 DRA。
对于方式( 2 )和( 3 ) , 目前标准中 proxy DRA在创建 DRA绑定时选 择 PCRF实体是随机的, 并不保证各个 PCRF实体之间的负载均衡。 在不改 变现有架构的条件下, 需要有一种方法来使 DRA获取 PCRF实体负载信息, 计算动态负载因子并调控 PCRF实体负载均衡。 发明内容
本发明要解决的技术问题是提供一种控制 PCRF实体负载均衡的实现方 法和实现系统, 以实现 PCRF实体的负载均衡。
为解决以上技术问题, 本发明提供了一种控制 PCRF实体负载均衡的实 现方法, 该方法包括:
信息收集步骤, Diameter路由代理 DRA从 DRA绑定指向的策略和计费 规则功能 PCRF实体获取所述 PCRF实体当前负载状态信息; 以及
PCRF实体选择步骤, 所述 DRA根据获取的所有 PCRF实体当前负载状 态信息, 为新建的 diameter会话选择负载较低的 PCRF实体。
所述信息收集步骤之前,该方法还包括创建、验证或删除所述 DRA绑定 步骤, 所述创建、 验证或删除所述 DRA绑定步骤包括:
所述 DRA向 PCRF实体发送 Diameter会话消息, 所述 Diameter会话消 息中携带 PCRF实体状态的查询指示;
所述 PCRF实体收到查询指示后, 向所述 DRA返回响应消息, 所述响应 消息中携带所述 PCRF实体当前负载状态信息; 以及
所述 DRA接收所述响应消息, 获取所述 PCRF实体当前负载状态信息。 所述 DRA设置针对各个 PCRF实体或所有 PCRF实体查询定时器, 所述 DRA向所述 PCRF实体发送所述 Diameter会话消息前,该方法还包 实体状态查询指示时, 在所述 Diameter会话消息中携带所述 PCRF实体状态 查询指示; 所述 DRA收到所述 PCRF实体发送的响应消息后, 重新启动所述 PCRF实体的查询定时器。
所述 DRA收到所述响应消息后,将所述响应消息中的所述负载状态信息 删除, 再转发给与所述 diameter会话相关的网元, 所述相关的网元包括策略 和计费执行功能 PCEF实体、承载绑定和事件报告功能 BBERF实体或应用功 能 AF实体网元。
所述 Diameter会话消息是 Diameter会话请求消息、 Diameter会话更新消 息、 或 Diameter会话终结消息。
所述方法适用于漫游场景及非漫游场景。
为解决以上技术问题, 本发明还提供了一种控制 PCRF实体负载均衡的 实现系统, 该系统包括相连的 Diameter路由代理 DRA及若干个 PCRF实体, 其中: 所述 DRA包括相连接的信息处理模块、 PCRF实体选择模块以及与所述 信息处理模块连接的消息收发模块, 其中,
所述信息处理模块设置为: 在向 DRA绑定指向的 PCRF 实体发送的 diameter消息中插入负载状态查询指示,以及解析所述 PCRF实体返回的当前 负载状态信息;
所述 PCRF实体选择模块设置为: 根据获取的所有 PCRF实体当前负载 状态信息, 使用动态负载均衡算法, 将新建的 diameter会话定向到负载较低 的 PCRF实体;
所述消息收发模块设置为: 向所述 PCRF实体发送 diameter消息及接收 所述 PCRF实体返回的响应消息;
所述 PCRF实体设置为: 接收所述 DRA发送的 diameter消息, 以及根据 所述负载状态查询指示向所述 DRA返回携带当前负载状态信息的响应消息。
所述 DRA还包括与所述信息处理模块连接的定时模块,
所述定时模块设置为: 在定时时间到达时通知所述信息处理模块; 所述信息处理模块还设置为: 判断定时器超时且定时周期内及超时后没 有向所述 PCRF实体发送 PCRF实体状态查询指示时, 在所述 Diameter消息 中携带所述 PCRF实体状态查询指示; 收到所述 PCRF实体发送的响应消息 后, 重新启动所述定时模块。
所述信息处理模块还设置为: 从 PCRF实体返回的响应消息中删除当前 负载状态信息,
所述消息收发模块还设置为: 向 diameter会话相关网元发送或接收 diameter消息; 所述相关网元包括策略和计费执行功能 PCEF实体、承载绑定 和事件报告功能 BBERF实体或应用功能 AF实体网元。 所述信息处理模块是设置为: 在发送给所述 PCRF实体的 Diameter会话 请求、 更新或终结消息中插入所述负载状态查询指示;
所述 PCRF实体是设置为:通过响应消息向所述 DRA发送自身当前负载 状态信息。
本发明还提供了一种 Diameter路由代理(DRA ) , 所述 DRA包括相连 接的信息处理模块、 策略和计费规则功能(PCRF )实体选择模块与所述信息 处理模块连接的消息收发模块, 其中,
所述信息处理模块设置为: 在向 DRA绑定指向的 PCRF 实体发送的 diameter消息中插入负载状态查询指示,以及解析所述 PCRF实体返回的当前 负载状态信息;
所述 PCRF实体选择模块设置为: 根据获取的所有 PCRF实体当前负载 状态信息, 使用动态负载均衡算法, 将新建的 diameter会话定向到负载较低 的 PCRF实体;
所述消息收发模块设置为: 向所述 PCRF实体发送 diameter消息及接收 所述 PCRF实体返回的响应消息; 所述响应消息由 PCRF实体根据所述负载 状态查询指示向所述 DRA返回, 并携带 PCRF实体当前负载状态信息。
所述 DRA还包括与所述信息处理模块连接的定时模块,
所述定时模块设置为: 在定时时间到达时通知所述信息处理模块; 所述信息处理模块还设置为: 判断定时器超时且定时周期内及超时后没 有向所述 PCRF实体发送 PCRF实体状态查询指示时, 在所述 Diameter消息 中携带所述 PCRF实体状态查询指示; 收到所述 PCRF实体发送的响应消息 后, 重新启动所述定时模块。
所述信息处理模块还设置为: 从 PCRF实体返回的响应消息中删除当前 负载状态信息,
所述消息收发模块还设置为: 向 diameter会话相关网元发送或接收 diameter消息; 所述相关网元包括策略和计费执行功能(PCEF ) 实体、 承载 绑定和事件报告功能(BBERF ) 实体或应用功能(AF ) 实体网元。
所述信息处理模块是设置为: 在发送给所述 PCRF实体的 Diameter会话 请求、 更新或终结消息中插入所述负载状态查询指示。 本发明方法和系统通过由 DRA主动获取 PCRF 实体的当前负载状态信 息, 并根据动态算法得到所有 PCRF实体的空闲容量比例,将新建的 diameter 会话定向到负载较低的 PCRF实体,从而实现了在 DRA调控下实现多个 PCRF 实体之间的负载均衡。 附图概述
图 1为 EPS的家乡路由的漫游架构图;
图 2为 EPS的本地疏导并家乡网络运营商提供 IP业务的漫游架构图; 图 3为 EPS的本地疏导并拜访地网络运营商提供 IP业务的漫游架构图; 图 4为本发明控制 PCRF实体负载均衡的实现方法实施例一的流程图; 图 5为本发明控制 PCRF实体负载均衡的实现方法实施例二的流程图; 图 6为本发明控制 PCRF实体负载均衡的实现方法实施例三的流程图; 图 7是本发明控制 PCRF实体负载均衡的实现方法实施例四的流程图; 图 8是本发明控制 PCRF实体负载均衡的实现方法实施例五的流程图; 图 9是本发明控制 PCRF实体负载均衡的实现方法实施例六的流程图; 图 10是本发明控制 PCRF实体负载均衡的实现系统的示意图。 本发明的较佳实施方式
本发明控制 PCRF实体负载均衡的实现方法, 包括以下步骤:
信息收集步骤, Diameter路由代理 DRA从 DRA绑定指向的 PCRF实体 获取所述 PCRF实体当前负载状态信息;
PCRF实体选择步骤, 所述 DRA根据获取的所有 PCRF实体当前负载状 态信息, 根据动态算法得到所有 PCRF 实体的空闲容量比例, 将新建的 diameter会话定向到负载较低的 PCRF实体。
以上信息釆集步骤在创建、验证或删除所述 DRA绑定后执行,可以通过 发送独立的消息向 PCRF实体获取, 优选地, 本发明推荐在不改变现有架构 的条件下实现 , 具体包括: 所述 DRA向 PCRF实体发送 Diameter会话请求、 更新或终结消息, 其中携带 PCRF实体状态查询指示; 所述 PCRF实体收到 查询指示后, 向所述 DRA返回响应消息, 其中携带所述 PCRF实体当前负载 状态信息; 所述 DRA接收所述响应消息, 获取所述 PCRF实体当前负载状态 信息。
为了适当控制 DRA向 PCRF实体查询的频率, 可以在 DRA设置查询针 对各个 PCRF实体或所有 PCRF实体的定时器, 以周期性的触发 DRA查询某 个 PCRF实体的负载状态。 所述 DRA向所述 PCRF实体发送所述 Diameter 会话请求、 更新或终结消息前, 判断定时器超时且定时周期内及超时后未向 所述 PCRF实体发送 PCRF实体状态查询指示时,在所述 Diameter会话请求、 更新或终结消息中携带所述 PCRF 实体状态查询指示; 所述 DRA收到所述 PCRF实体发送的响应消息后, 重新启动所述 PCRF实体的查询定时器。 不满 足上述条件时, DRA仅充当转发职能, 不对 diameter消息进行任何加工或解 析。 另外, 如果不使用所述定时器, 则需要 DRA在转发每条新建 /修改 /终结 diameter会话请求消息时,插入 PCRF实体状态查询指示,并且解析每条 PCRF 实体回复的响应消息, 获取 PCRF实体状态信息。
所述 DRA收到所述响应消息后,将其中的所述负载状态信息删除,再转 发给与所述 diameter会话相关的 PCEF实体、 BBERF实体或 AF实体等网元。
本发明提供的技术方案实现了在漫游或非漫游场景下, BBERF 实体、
PCEF实体或 AF实体在与 PCRF实体之间建立 Diameter会话时,可以由 DRA 调控实现多个 PCRF实体之间的负载均衡。
下面结合附图对本发明所述方法进一步详细说明。
实施例考虑如下的场景: ( 1 )在非漫游场景下 proxy DRA控制到低负载 PCRF实体建立 diameter会话, 如实施例一; ( 2 )在漫游场景下 proxy DRA 控制到低负载 PCRF实体建立 diameter会话, 如实施例二; ( 3 )非漫游场景 下 proxy DRA在终结 diameter会话流程中获取 PCRF实体负载状态信息, 如 实施例三; ( 4 )漫游场景下 proxy DRA在终结 diameter会话流程中获取 PCRF 实体负载状态信息,如实施例四; ( 5 )非漫游场景下 client发起的修改 diameter 会话流程, proxy DRA获取 PCRF实体负载状态信息, 如实施例五; (6 )漫 游场景下 V-PCRF发起的修改 diameter会话流程, roxy DRA获取 PCRF实 体负载状态信息, 如实施例六。
以下流程中将 PCEF实体、 BBERF实体和 AF实体统称为 client。
实施例一
本实施例描述了 client和 proxy DRA以及 PCRF实体均在归属地网络时, 由外部事件触发 diameter会话建立流程,并由 DRA获取 PCRF实体负载信息 并控制 diameter会话建立到负载较低的 PCRF实体。 本实施例同样适用于所 有图 4所示网元都在拜访地网络的场景。 如图 4所示, 各步骤描述如下: 步骤 401: proxy DRA的 client收到外部触发(例如 IP-CAN会话建立请 求) , 需要与 PCRF实体建立一条 diameter会话;
步骤 402: Client向 proxy DRA发送带有用户信息(如 UE-NAI )的 diameter 建立请求;
步骤 403: DRA将用户信息保存下来, 并检查当前是否存在对应该用户 的 DRA绑定。 如果不存在, DRA会创建一条动态 DRA绑定(即为每个 UE 或者每个 IP-CAN指派一个 PCRF实体 ) 。 DRA指派 PCRF实体是基于网络 中各 PCRF实体的负载比例选择负载最低的 PCRF实体, 本实施例中, DRA 选择了 PCRF实体 -1 ;
步骤 404: proxy DRA向 PCRF实体 -1转发 diameter请求消息。此时如果 DRA中的 PCRF实体 -1的查询计时器已经超时, 并且 DRA尚未发出查询请 求 , 则 DRA还应在 diameter请求消息中加带 PCRF实体状态查询指示;
步骤 405: 检测到 diameter请求消息中的状态查询指示, PCRF实体 -1向 DRA返回 diameter响应消息(包含 PCRF实体 -1的当前状态信息,如空闲容量 等);
步骤 406: Proxy DRA解析步骤 405的 diameter响应消息, 获取 PCRF实 体 -1 的状态信息, 并从消息中删除这一部分, 再将消息转发给 client。 DRA 重新启动 PCRF实体 -1的状态查询计时器;
步骤 407: 如果配置了 PA2, client可将 PCRF实体 -1的地址存储起来, 并将后续的 diameter会话消息跳过 proxy DRA, 直接发给 PCRF实体 -1; 配置 PA2即 DRA在转发 PCRF实体返回的确认消息时会把 PCRF实体的 地址也发送给 PCEF实体、 BBERF实体或 AF实体。 在随后的消息交互中, PCEF实体、 BBERF实体或 AF实体直接与 PCRF实体交互而不需要经过 DRA。
至此, DRA更新了 PCRF实体 -1的负载信息,此后根据网络中所有 PCRF 实体的负载状况计算出 PCRF实体相对空闲比例, 为新建的 IP-CAN会话的 diameter会话选择负载较低的 PCRF实体。
实施例二
本实施例描述了拜访地 PCRF实体经归属地 proxy DRA定位归属地 PCRF 实体, 建立 diameter会话的信令流程, 其中 DRA获取 PCRF实体负载信息并 控制 diameter会话建立到负载较低的 PCRF实体。 如图 5所示, 各步骤描述 下:
步骤 501 : 拜访地 V-PCRF实体收到外部触发(例如 s9接口上的会话建 立请求) , 需要与归属地 H-PCRF实体建立一条 diameter会话;
步骤 502: V-PCRF实体向归属地 H-DRA发送带有用户信息(如 UE-NAI ) 的 diameter建立请求;
步骤 503: H-DRA将用户信息保存下来, 并检查当前是否存在对应该用 户的 DRA绑定。 如果不存在, DRA会创建一条动态 DRA绑定(即为每个 UE或者每个 IP-CAN指派一个 PCRF实体 )。 H-DRA指派 PCRF实体是基于 归属网络中各 PCRF实体的负载比例选择负载最低的 PCRF实体, 本实施例 中, H-DRA选择了 H-PCRF实体 -1 ;
步骤 504: proxy H-DRA向 H-PCRF实体 -1转发 diameter请求消息。此时 如果 DRA中的 H-PCRF实体 -1的查询计时器已经超时, 并且 H-DRA尚未发 出查询请求,则 H-DRA还应在 diameter请求消息中加带 PCRF实体状态查询 指示;
步骤 505: 检测到 diameter请求消息中的状态查询指示, H-PCRF实体- 1 向 H-DRA返回 diameter响应消息(包含 H-PCRF实体 -1的当前状态信息, 如 空闲容量等);
步骤 506: H-DRA解析步骤 505的 diameter响应消息, 获取 H-PCRF实 体 -1的状态信息, 并从消息中删除这一部分, 再将消息转发给 V-PCRF实体。 H-DRA重新启动 H-PCRF实体 -1的状态查询计时器;
步骤 507: 如果配置了 PA2, V-PCRF实体可将 H-PCRF实体 -1的地址存 储起来, 并将后续的 diameter会话消息跳过 proxy DRA, 直接发给 H-PCRF 实体 -1 ;
至此, H-DRA更新了 H-PCRF实体 -1的负载信息, 此后根据归属网络中 所有 PCRF 实体的负载状况计算出 PCRF 实体相对空闲比例, 为新建的 IP-CAN会话的 diameter会话选择负载较低的 PCRF实体。
实施例三
本实施例描述的是 proxy DRA的 client终结 diameter会话的流程, 其中 DRA通过 client获取到 PCRF实体的负载信息。 本实施例同样适用于拜访地 client通过拜访地 DRA终结 diameter会话的场景。 如图 6所示, 各步骤描述 下:
步骤 601 : proxy DRA的 client收到外部触发 (例如 UE或 PCRF实体发 起的 IP-CAN会话终结请求) , 需要与 PCRF实体终结 diameter会话;
步骤 602: Client向 proxy DRA发送 diameter终结请求,消息使用与 client 和 PCRF实体 -1之间已建立的 diameter会话相同的 Session-ID AVP (会话标 识 ID ) ;
步骤 603: 通过检查步骤 602消息的 Session-ID AVP, Proxy DRA验证到 有一条针对该 IP-CAN会话的 DRA绑定(指向 PCRF实体 -1 ) ;
步骤 604: proxy DRA向 PCRF实体 -1转发 diameter终结请求消息。此时 如果 DRA中的 PCRF实体 -1的查询计时器已经超时, 并且 DRA尚未发出查 询请求,则 DRA还应在 diameter终结请求消息中加带 PCRF实体状态查询指 示;
步骤 605: 检测到 diameter终结请求消息中的状态查询指示, PCRF实体 -1终结对应的会话并向 DRA返回 diameter响应消息(包含 PCRF实体 -1的当 前状态信息, 如空闲容量等);
步骤 606: Proxy DRA将 diameter会话标记为已终结。 如果 DRA绑定是 针对每个 IP-CAN会话创建的,并且所有该 IP-CAN会话下的 diameter会话都 已被终结, 或者如果 DRA绑定时针对每个 UE创建的, 并且所有该 UE的 diameter会话都已被终结, 那么 DRA绑定就会被删除;
步骤 607: DRA解析步骤 605的 diameter响应消息, 获取 PCRF实体 -1 的状态信息, 并从消息中删除这一部分, 再将消息转发给 client。 DRA重新 启动 PCRF实体 -1的状态查询计时器。
至此, proxy DRA更新了 PCRF实体 -1的负载信息, 此后根据网络中所 有 PCRF实体的负载状况计算出 PCRF实体相对空闲比例, 为新建的 IP-CAN 会话的 diameter会话选择负载较低的 PCRF实体。
实施例四
本实施例描述了拜访地 PCRF实体通过归属地 proxy DRA与归属地 PCRF 实体交互, 终结 diameter会话的信令流程。 如图 7所示, 各步骤描述如下: 步骤 701 :拜访地 V-PCRF实体收到外部触发(例如 BBERF实体或 PCEF 实体请求的会话终结请求), 需要与归属地 H-PCRF实体终结 diameter会话; 步骤 702: V-PCRF实体向归属地 proxy H-DRA发送 diameter终结请求, 消息使用与 client和 PCRF实体 - 1之间已建立的 diameter会话相同的 Session-Id AVP;
步骤 703: 通过检查步骤 702消息的 Session-ID AVP, H-DRA验证到有 一条针对该 IP-CAN会话的 DRA绑定(指向 H-PCRF实体 -1 ) ;
步骤 704: H-DRA向目标 H-PCRF实体 -1转发 diameter终结请求消息。 此时如果 H-DRA中的 H-PCRF实体 -1的查询计时器已经超时, 并且 H-DRA 尚未发出查询请求,则 H-DRA还应在 diameter终结请求消息中加带 PCRF实 体状态查询指示;
步骤 705: 检测到 diameter终结请求消息中的状态查询指示, H-PCRF实 体 -1终结对应的会话并向 H-DRA返回 S9 diameter响应消息(包含 H-PCRF实 体 -1的当前状态信息, 如空闲容量等);
步骤 706: H-DRA将相应的 diameter会话标记为已终结。 如果该 UE的 diameter会话都已被终结, 那么 DRA绑定也会被删除;
步骤 707: H-DRA解析步骤 705的 S9 diameter响应消息, 获取 H-PCRF 实体 -1 的状态信息, 并从消息中删除这一部分, 再将消息转发给拜访地的 V-PCRF实体。 H-DRA重新启动 H-PCRF实体 -1的状态查询计时器。
至此, proxy H-DRA更新了 H-PCRF实体 -1的负载信息, 此后根据归属 网络中所有 PCRF实体的负载状况计算出 PCRF实体相对空闲比例, 为新建 的 IP-CAN会话的 diameter会话选择负载较低的 PCRF实体。
实施例五
本实施例描述了非漫游场景下,执行 PA1 (即 client总是通过 proxy DRA 与 PCRF实体交互) , 修改 diameter会话的信令流程。 本实施例同样适用于 拜访地 client通过拜访地 DRA修改 diameter会话的场景。 如图 8所示, 各步 骤描述如下:
步骤 801: proxy DRA的 client收到外部触发 (例如 IP-CAN会话修改请 求) , 需要向相应 PCRF实体发送修改 diameter请求消息;
步骤 802: Client向 proxy DRA发送修改 diameter请求消息;
步骤 803: Proxy DRA验证到有一条步骤 802请求会话关联的 DRA绑定
(指向 PCRF实体 -1 ) ;
步骤 804: DRA向目标 PCRF实体 -1转发 diameter请求消息。 此时如果 DRA中的 PCRF实体 -1的查询计时器已经超时, 并且 DRA尚未发出查询请 求 , 则 DRA还应在 diameter请求消息中加带 PCRF实体状态查询指示;
步骤 805: 检测到 diameter请求消息中的状态查询指示, PCRF实体- 1 向 DRA返回 diameter响应消息(包含 PCRF实体 -1的当前状态信息, 如空闲 容量等);
步骤 806: DRA解析步骤 805的 diameter响应消息, 获取 PCRF实体 -1 的状态信息, 并从消息中删除这一部分, 再将消息转发给 client。 DRA重新 启动 PCRF实体 -1的状态查询计时器。
至此, proxy DRA更新了 PCRF实体 -1的负载信息, 此后根据网络中所 有 PCRF实体的负载状况计算出 PCRF实体相对空闲比例, 为新建的 IP-CAN 会话的 diameter会话选择负载较低的 PCRF实体。
实施例六
本实施例描述了漫游场景下, 执行 PA1 , 拜访地 V-PCRF实体通过归属 地 proxy H-DRA与归属地 H-PCRF实体交互,修改 diameter会话的信令流程。 如图 9所示, 各步骤描述如下:
步骤 901: 拜访地 V-PCRF实体收到内部或外部触发, 需要在 S9接口上 向归属地 PCRF实体发送 diameter消息;
步骤 902: V-PCRF实体在 S9接口上发出 diameter会话更新(例如 S9会 话修改请求 ) 消息, 并由归属地的 proxy H-DRA接收到;
步骤 903: Proxy H-DRA验证到有一条与步骤 902请求的会话关联的 DRA 绑定(指向 H-PCRF实体 -1 ) ;
步骤 904: H-DRA向目标 H-PCRF实体 -1转发 diameter会话更新消息。 此时如果 H-DRA中的 H-PCRF实体 -1的查询计时器已经超时, 并且 H-DRA 尚未发出查询请求,则 H-DRA还应在 diameter会话更新消息中加带 PCRF实 体状态查询指示;
步骤 905: 检测到 diameter会话更新消息中的状态查询指示, H-PCRF 实体 -1向 H-DRA返回 diameter响应消息(包含 H-PCRF实体 -1的当前状态信 息, 如空闲容量等);
步骤 906: H-DRA解析步骤 905的 diameter响应消息, 获取 H-PCRF实 体 -1 的状态信息, 并从消息中删除这一部分, 再将消息转发给拜访地的 V-PCRF实体。 H-DRA重新启动 H-PCRF实体 -1的状态查询计时器。
至此, proxy H-DRA更新了 H-PCRF实体 -1的负载信息, 此后根据归属 网络中所有 PCRF实体的负载状况计算出 PCRF实体相对空闲比例, 为新建 的 IP-CAN会话的 diameter会话选择负载较低的 PCRF实体。
为了实现以上方法、 流程, 本发明还提供一种控制 PCRF实体负载均衡 的实现系统, 如图 10所示, 该系统包括相连的 Diameter路由代理 DRA100 及若干个 PCRF实体 101 , 其中:
所述 DRA100 包括相连接的信息处理模块 1001、 PCRF 实体选择模块 1002、与所述信息处理模块连接的定时模块 1003以及与所述信息处理模块连 接的消息收发模块 1004, 其中,
所述信息处理模块 1001用于在向 DRA 100绑定指向的 PCRF实体 101 发送的 diameter消息中插入负载状态查询指示, 解析所述 PCRF实体 101返 回的当前负载状态信息, 以及从中删除 PCRF实体负载状态信息;
所述信息处理模块 1001在发送给 PCRF实体 101的 Diameter会话请求、 更新或终结消息中插入所述负载状态查询指示, 所述 PCRF实体 101通过响 应消息向所述 DRA100发送当前负载状态信息。
所述 PCRF实体选择模块 1002, 用于根据获取的所有 PCRF实体当前负 载状态信息, 套用动态负载均衡算法, 将新建的 diameter会话定向到负载较 低的 PCRF实体。 初始化的状态下, 该模块均默认所有 PCRF实体为零负载; 所述定时模块 1003 , 用于在定时时间到达时通知所述信息处理模块 1001 ,所述信息处理模块 1001判断定时器超时且定时周期内及超时后没有向 所述 PCRF实体 101发送 PCRF实体状态查询指示时,在所述 Diameter请求、 更新或终结会话消息中携带所述 PCRF实体状态查询指示; 还用于收到所述 PCRF实体发送的响应消息后, 重新启动所述定时模块 1003。
所述消息收发模块 1004用于向 diameter会话相关网元及 PCRF实体发送 或接收 diameter消息, 所述网元包括策略和计费执行功能 PCEF实体、 承载 绑定和事件报告功能 BBERF实体, 应用功能 AF实体网元。
所述 PCRF实体 101 , 用于接收所述 DRA发送的 diameter消息, 以及根 据其中的负载状态查询指示向所述 DRA返回携带当前负载状态信息的响应 消息。 本发明还提供了一种 Diameter路由代理(DRA ) , 所述 DRA包括相连 接的信息处理模块、 策略和计费规则功能(PCRF )实体选择模块与所述信息 处理模块连接的消息收发模块, 其中,
所述信息处理模块设置为: 在向 DRA绑定指向的 PCRF 实体发送的 diameter消息中插入负载状态查询指示,以及解析所述 PCRF实体返回的当前 负载状态信息;
所述 PCRF实体选择模块设置为: 根据获取的所有 PCRF实体当前负载 状态信息, 使用动态负载均衡算法, 将新建的 diameter会话定向到负载较低 的 PCRF实体;
所述消息收发模块设置为: 向所述 PCRF实体发送 diameter消息及接收 所述 PCRF实体返回的响应消息; 所述响应消息由 PCRF实体根据所述负载 状态查询指示向所述 DRA返回, 并携带 PCRF实体当前负载状态信息。
所述 DRA还包括与所述信息处理模块连接的定时模块,
所述定时模块设置为: 在定时时间到达时通知所述信息处理模块; 所述信息处理模块还设置为: 判断定时器超时且定时周期内及超时后没 有向所述 PCRF实体发送 PCRF实体状态查询指示时, 在所述 Diameter消息 中携带所述 PCRF实体状态查询指示; 收到所述 PCRF实体发送的响应消息 后, 重新启动所述定时模块。
所述信息处理模块还设置为: 从 PCRF实体返回的响应消息中删除当前 负载状态信息,
所述消息收发模块还设置为: 向 diameter会话相关网元发送或接收 diameter消息; 所述相关网元包括策略和计费执行功能(PCEF ) 实体、 承载 绑定和事件报告功能(BBERF ) 实体或应用功能(AF ) 实体网元。
所述信息处理模块是设置为: 在发送给所述 PCRF实体的 Diameter会话 请求、 更新或终结消息中插入所述负载状态查询指示。
本发明方法和系统通过由 DRA主动获取 PCRF 实体的当前负载状态信 息, 并根据动态算法得到所有 PCRF实体的空闲容量比例,将新建的 diameter 会话定向到负载较低的 PCRF实体, 从而实现了在 DRA调控下的多个 PCRF 实体之间的负载均衡。
工业实用性
本发明方法和系统通过由 DRA主动获取 PCRF 实体的当前负载状态信 息, 并根据动态算法得到所有 PCRF实体的空闲容量比例,将新建的 diameter 会话定向到负载较低的 PCRF实体,从而实现了在 DRA调控下实现多个 PCRF 实体之间的负载均衡。

Claims

权 利 要 求 书
1、 一种控制策略和计费规则功能(PCRF ) 实体负载均衡的实现方法, 该方法包括:
信息收集步骤, Diameter路由代理( DRA )从 DRA绑定指向的策略和计 费规则功能(PCRF ) 实体获取所述 PCRF实体当前负载状态信息; 以及
PCRF实体选择步骤, 所述 DRA根据获取的所有 PCRF实体当前负载状 态信息, 为新建的 diameter会话选择负载较低的 PCRF实体。
2、 如权利要求 1所述的方法, 其中, 所述信息收集步骤之前, 该方法还 包括创建、验证或删除所述 DRA绑定步骤,所述创建、验证或删除所述 DRA 绑定步骤包括:
所述 DRA向 PCRF实体发送 Diameter会话消息, 所述 Diameter会话消 息中携带 PCRF实体状态的查询指示;
所述 PCRF实体收到所述查询指示后, 向所述 DRA返回响应消息, 所述 响应消息中携带所述 PCRF实体当前负载状态信息; 以及
所述 DRA接收所述响应消息, 获取所述 PCRF实体当前负载状态信息。
3、 如权利要求 2所述的方法, 其中, 所述 DRA设置针对各个 PCRF实 体或所有 PCRF实体查询定时器,
所述 DRA向所述 PCRF实体发送所述 Diameter会话消息前,该方法还包 实体状态查询指示时, 在所述 Diameter会话消息中携带所述 PCRF实体状态 查询指示; 所述 DRA收到所述 PCRF实体发送的响应消息后, 重新启动所述 PCRF实体的查询定时器。
4、 如权利要求 2所述的方法, 其中, 所述 DRA收到所述响应消息后, 将所述响应消息中的所述负载状态信息删除, 再转发给与所述 diameter会话 相关的网元, 所述相关的网元包括策略和计费执行功能(PCEF ) 实体、 承载 绑定和事件报告功能(BBERF ) 实体或应用功能(AF ) 实体网元。
5、如权利要求 2至 4中任一项所述的方法, 其中, 所述 Diameter会话消 息是 Diameter会话请求消息、 Diameter会话更新消息、 或 Diameter会话终结 消息。
6、 如权利要求 2至 4中任一项所述的方法, 其中, 所述方法适用于漫游 场景及非漫游场景。
7、 一种控制策略和计费规则功能(PCRF ) 实体负载均衡的实现系统, 该系统包括相连的 Diameter路由代理( DRA )及若干个 PCRF实体, 其中: 所述 DRA包括相连接的信息处理模块、 PCRF实体选择模块以及与所述 信息处理模块连接的消息收发模块, 其中,
所述信息处理模块设置为: 在向 DRA绑定指向的 PCRF 实体发送的 diameter消息中插入负载状态查询指示,以及解析所述 PCRF实体返回的当前 负载状态信息;
所述 PCRF实体选择模块设置为: 根据获取的所有 PCRF实体当前负载 状态信息, 使用动态负载均衡算法, 将新建的 diameter会话定向到负载较低 的 PCRF实体;
所述消息收发模块设置为: 向所述 PCRF实体发送 diameter消息及接收 所述 PCRF实体返回的响应消息;
所述 PCRF实体设置为: 接收所述 DRA发送的 diameter消息, 以及根据 所述负载状态查询指示向所述 DRA返回携带当前负载状态信息的响应消息。
8、 如权利要求 7所述的实现系统, 其中, 所述 DRA还包括与所述信息 处理模块连接的定时模块,
所述定时模块设置为: 在定时时间到达时通知所述信息处理模块; 所述信息处理模块还设置为: 判断定时器超时且定时周期内及超时后没 有向所述 PCRF实体发送 PCRF实体状态查询指示时, 在所述 Diameter消息 中携带所述 PCRF实体状态查询指示; 收到所述 PCRF实体发送的响应消息 后, 重新启动所述定时模块。
9、 如权利要求 7所述的实现系统, 其中,
所述信息处理模块还设置为: 从 PCRF实体返回的响应消息中删除当前 负载状态信息,
所述消息收发模块还设置为: 向 diameter会话相关网元发送或接收 diameter消息; 所述相关网元包括策略和计费执行功能(PCEF ) 实体、 承载 绑定和事件报告功能(BBERF ) 实体或应用功能(AF ) 实体网元。
10、 如权利要求 7至 9中任一项所述的实现系统, 其中, 所述信息处理模块是设置为: 在发送给所述 PCRF实体的 Diameter会话 请求、 更新或终结消息中插入所述负载状态查询指示;
所述 PCRF实体是设置为:通过响应消息向所述 DRA发送自身当前负载 状态信息。
11、 一种 Diameter路由代理(DRA ) , 所述 DRA包括相连接的信息处 理模块、 策略和计费规则功能(PCRF )实体选择模块与所述信息处理模块连 接的消息收发模块, 其中,
所述信息处理模块设置为: 在向 DRA绑定指向的 PCRF 实体发送的 diameter消息中插入负载状态查询指示,以及解析所述 PCRF实体返回的当前 负载状态信息;
所述 PCRF实体选择模块设置为: 根据获取的所有 PCRF实体当前负载 状态信息, 使用动态负载均衡算法, 将新建的 diameter会话定向到负载较低 的 PCRF实体;
所述消息收发模块设置为: 向所述 PCRF实体发送 diameter消息及接收 所述 PCRF实体返回的响应消息; 所述响应消息由 PCRF实体根据所述负载 状态查询指示向所述 DRA返回, 并携带 PCRF实体当前负载状态信息。
12、 如权利要求 11所述的 DRA, 其中, 所述 DRA还包括与所述信息处 理模块连接的定时模块,
所述定时模块设置为: 在定时时间到达时通知所述信息处理模块; 所述信息处理模块还设置为: 判断定时器超时且定时周期内及超时后没 有向所述 PCRF实体发送 PCRF实体状态查询指示时, 在所述 Diameter消息 中携带所述 PCRF实体状态查询指示; 收到所述 PCRF实体发送的响应消息 后, 重新启动所述定时模块。
13、 如权利要求 11所述的 DRA, 其中,
所述信息处理模块还设置为: 从 PCRF实体返回的响应消息中删除当前 负载状态信息,
所述消息收发模块还设置为: 向 diameter会话相关网元发送或接收 diameter消息; 所述相关网元包括策略和计费执行功能(PCEF ) 实体、 承载 绑定和事件报告功能(BBERF ) 实体或应用功能(AF ) 实体网元。
14、 如权利要求 11所述的 DRA, 其中,
所述信息处理模块是设置为: 在发送给所述 PCRF实体的 Diameter会话 请求、 更新或终结消息中插入所述负载状态查询指示。
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