CN102111740A - Multi-access supported policy charging controlling method and system - Google Patents
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Abstract
The invention discloses a multi-access supported policy charging controlling method and system. The method is as follows: a visit policy and charging rule function (vPCRF) reports access network information corresponding to an internet protocol (IP) connecting access network (IP-CAN) conversation to a home PCRF (hPCRF), wherein the hPCRF establishes a policy and charging control (PCC) rule for the IP-CAN conversation according to the access network information. In the method, the access network information is corresponding to the IP-CAN conversation, so that the hPCRF can establish the PCC rules and quality of service (QoS) rules according to the access network information corresponding to different IP-CAN conversations. Furthermore, the conventional protocol is little changed, so the practical application is facilitated.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a policy charging control method and system supporting multiple accesses.
Background
The Policy and Charging Control (PCC) architecture of 3GPP (3rd Generation Partnership Project) is a functional framework that can be applied to multiple Access technologies, for example, it can be applied to a Terrestrial Radio Access Network (UTRAN) of a Universal Mobile Telecommunications System (UMTS), a Global System for Mobile communications (GSM)/GSM Enhanced Data Evolution (EDGE) Radio Access Network, an interworking wireless local area Network (I-WLAN), and an Evolved Packet System (EPS), etc.
Fig. 1 is a diagram of a related art Rel-8PCC non-roaming architecture, and various logical functional entities and interface functions thereof in the PCC architecture are described below with reference to fig. 1: an Application Function entity (AF) provides access points for service applications, and network resources used by the service applications need to be dynamically policy-controlled. When the service plane performs parameter negotiation, the AF transfers relevant service information to a Policy and charging Rules Function (Policy and charging Rules Function, abbreviated as PCRF). If the service information is consistent with the policy of the PCRF, the PCRF accepts the negotiation; otherwise, the PCRF refuses the negotiation and simultaneously gives out the service parameters acceptable by the PCRF in the feedback. The AF may then return these parameters to the User Equipment (UE for short). Wherein, the interface between the AF and the PCRF is an Rx interface.
A policy control and charging rules function (PCRF) is the core of the PCC and is responsible for policy decisions and the formulation of charging rules. The PCRF provides network Control rules based on traffic data flows, which include detection of traffic data flows, Gating (Gating Control), quality of Service (QoS) Control, and charging rules based on traffic data flows. The PCRF sends the Policy and charging rules formulated by the PCRF to a Policy and charging enforcement Function (Policy and charging enforcement Function, abbreviated as PCEF) for enforcement, and meanwhile, the PCRF needs to ensure that the rules are consistent with the subscription information of the user. The basis for the PCRF to formulate the policy and charging rules comprises the following steps: acquiring information related to the service from the AF; acquiring Subscription information with user policy charging control from a Subscription database (Subscription Profile Repository, abbreviated as SPR); information of a bearer-related network is acquired from a PCEF.
A policy and charging enforcement function entity (PCEF), typically located in a gateway (Gate-Way, abbreviated as GW), enforces policy and charging rules formulated by the PCRF at the bearer plane. The PCEF detects the service data flows according to the service data flow filters in the rules sent by the PCRF, and then executes the policy and charging rules formulated by the PCRF on the service data flows. When the load is established, the PCEF carries out QoS authorization according to the rule sent by the PCRF, and carries out gating control according to the execution of the AF. According to the charging rules sent by the PCRF, the PCEF performs a corresponding service data flow charging operation, and the charging may be either online charging or offline charging. In case of Online Charging, the PCEF needs to perform credit management together with an Online Charging System (OCS). During Offline Charging, relevant Charging information is exchanged between the PCEF and an Offline Charging System (OFCS). The interface between the PCEF and the PCRF is a Gx interface, the interface between the PCEF and the OCS is a Gy interface, and the interface between the PCEF and the OFCS is a Gz interface. The PCEF is typically located at a Gateway of the network, such as a GPRS Gateway Support Node (GGSN) in GPRS and a Packet Data Gateway (PDG) in I-WLAN.
The functions of a Bearer Binding and Event reporting function entity (BBERF) include Bearer Binding, verification of uplink Bearer Binding, and Event reporting. When UE is accessed through E-UTRAN and PMIPv6 protocol is adopted between Serving Gateway (S-GW) and Packet Data network Gateway (P-GW), BBERF is located at S-GW, when UE is accessed through trusted non-3 GPP access system, BBERF is located at trusted non-3 GPP access Gateway, when UE is accessed through untrusted non-3 GPP access system, BBERF is located at Evolved Packet Data Gateway (ePDG). At this point, the PCEF no longer performs the bearer binding function.
The subscriber subscription database (SPR) stores subscriber policy charging control subscription information relating to policy control and charging. The interface between the SPR and the PCRF is an Sp interface.
The Online Charging System (OCS) and the PCEF together control and manage the user credit in an online charging mode.
And the offline charging system (OFCS) and the PCEF together complete the charging operation in the offline charging mode.
The PCC architecture implements policy charging control on an IP connectivity access Network (IP-CAN) session established by the UE for accessing a Packet Data Network (PDN) through the above functional entities.
In the current technology, the protocols adopted in the PCC architecture are Diameter application protocols developed on the basis of Diameter Base protocols (Diameter Base protocols), for example, application protocols applied to a Gx interface, application protocols applied to an Rx interface, application protocols applied to a Gxx interface (including Gxa and Gxc interfaces), application protocols applied to a roaming interface S9, and the like. Messages, commands, and AVPs (Attribute Value Pairs) for the PCC, etc. are defined in these application protocols. The Diameter sessions established with these protocols may become a Gx session, a gateway control session (Gxx session), an Rx session, and an S9 session, respectively. And each PCC functional entity carries out policy charging control on the PDN connection established by the UE access network through the sessions.
Fig. 2 and fig. 3 are architecture diagrams of PCC in two roaming scenarios, home routing and local breakout, respectively. The PCRF of the Home (i.e. HPLMN, Home Public Land Mobile Network) is an hPCRF (Home policy control and charging rules function entity), and the PCRF of the visited (i.e. VPLMN, Visit Public Land Mobile Network, visited Public Land Mobile Network) is a vpcr (visited policy control and charging rules function entity). Under the home and country routing scene, the PCEF is at the home, and if the BBERF exists, the BBERF is at the visit place. In the local breakout roaming scenario, the PCEF is at the visited place, and if there is a BBERF, the BBERF is also at the visited place.
Currently, the scheme for implementing the S9 roaming interface is that for each UE, the vrpcrf terminates the Gx session and the gateway control session (Gxx session) existing in the visited network for all IP-CAN sessions established by the UE, and uses one S9 session to transmit information on the Gx session and the gateway control session (Gxx session) for all IP-CAN sessions, instead of terminating the Rx session in the visited network for all IP-CAN sessions, only forwards the information of the Rx session to the hPCRF, and uses the vrpcrf as a Proxy (Proxy). When the user roams, the information related to the access network that the user currently accesses is transmitted through the S9 session for policy decision making of the PCRF at the home, and since the information related to the access network is associated with the user, the S9 session CAN only transmit the information related to the access network that all IP-CAN sessions are consistent.
In a multi-access scenario, due to the defect that the S9 session CAN only transmit the access network related information that all IP-CAN sessions of one user are consistent, the hPCRF cannot make different policies for different IP-CAN sessions established by the user through different access networks according to different access network capabilities.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a policy charging control method and system supporting multiple accesses, and solve the problem that in a multiple access scene, an hPCRF cannot make different policies for different IP-CAN sessions established by users through different access networks according to different access network capabilities.
In order to solve the above technical problem, the present invention provides a policy charging control method supporting multiple accesses, including:
a visiting policy control and charging rule function entity (vPCRF) reports access network information corresponding to an IP connection access network (IP-CAN) session to a hometown policy control and charging rule function entity (hPCRF);
and the hPCRF formulates a Policy and Charging Control (PCC) rule for the IP-CAN session according to the access network information.
Further, the method can also have the following characteristics:
the access network information includes an IP-CAN type and/or a Radio Access Type (RAT).
Further, the method can also have the following characteristics:
the hPCRF also formulates PCC rules according to subscription data and/or network policies.
Further, the method can also have the following characteristics:
in the step of reporting the access network information corresponding to the IP-CAN session to the hPCRF,
and the vPCRF encapsulates the access network information corresponding to the IP-CAN session in the S9 sub-session corresponding to the IP-CAN session, sends the access network information to the hPCRF and reports the access network information corresponding to the IP-CAN session.
Further, the method can also have the following characteristics:
in the step of reporting the access network information corresponding to the IP-CAN session to the hPCRF,
the vPCRF identifies access network information corresponding to the IP-CAN session by using a BBERF address corresponding to the IP-CAN session, and the vPCRF encapsulates the BBERF address corresponding to the IP-CAN session in an S9 sub-session corresponding to the IP-CAN session, sends the BBERF address to the hPCRF and reports the access network information corresponding to the IP-CAN session.
Further, the method can also have the following characteristics:
the hPCRF further formulates quality of service (QoS) rules according to the PCC rules.
In order to solve the technical problem, the invention provides a policy charging control system supporting multiple accesses, which comprises a vPCRF and an hPCRF,
the vPCRF is used for reporting access network information corresponding to the IP-CAN session to the hPCRF;
the hPCRF is used for making a PCC rule for the IP-CAN conversation according to the access network information.
Further, the system can also have the following characteristics:
the access network information includes an IP-CAN type and/or a RAT.
Further, the system can also have the following characteristics:
the hPCRF is further used for formulating PCC rules according to subscription data and/or network policies.
Further, the system can also have the following characteristics:
and the vPCRF is further used for encapsulating the access network information corresponding to the IP-CAN session in the S9 sub-session corresponding to the IP-CAN session, sending the encapsulated access network information to the hPCRF and reporting the access network information corresponding to the IP-CAN session.
Further, the system can also have the following characteristics:
the vPCRF is further used for identifying access network information corresponding to the IP-CAN session by using a BBERF address corresponding to the IP-CAN session, encapsulating the BBERF address corresponding to the IP-CAN session in an S9 sub-session corresponding to the IP-CAN session, sending the BBERF address to the hPCRF, and reporting the access network information corresponding to the IP-CAN session;
the hPCRF is further used for acquiring access network information corresponding to the IP-CAN session according to the received BBERF address.
Further, the system can also have the following characteristics:
the hPCRF is further configured to formulate a QoS rule according to the PCC rule.
The invention provides that the access network information corresponds to the IP-CAN conversation, so that the hPCRF CAN formulate a PCC rule and a QoS rule according to the access network information corresponding to different IP-CAN conversations. The invention has little change to the existing protocol and is convenient for practical application.
Drawings
FIG. 1 is a prior art architecture diagram of PCC without roaming;
fig. 2 is an architecture diagram of a PCC home route roaming scenario of the prior art;
fig. 3 is an architecture diagram of a PCC local breakout roaming scenario of the prior art;
fig. 4 is a multiple access schematic;
FIG. 5 is a flow chart of a first embodiment of the present invention;
FIG. 6 is a flowchart of a second embodiment of the present invention.
Detailed Description
In the prior art, since a UE is usually accessed from only one access gateway for an IP-CAN session, the hPCRF makes a default policy for the IP-CAN session according to access network information associated with the UE. However, if the UE accesses from multiple access gateways to establish multiple IP-CAN sessions, the hPCRF cannot make different policies for different IP-CAN sessions established by the UE through different access networks according to different access network capabilities.
The multi-access supports the UE to access multiple PDNs through different P-GWs or the same P-GW through multiple access networks. As shown in fig. 4, the UE accesses PDN1 and PDN2 through the non-3 GPP IP access network and the 3GPP access network under the coverage of both non-3 GPP and 3GPP accesses.
In the invention, the access network information is associated with each IP-CAN session, so that the hPCRF CAN establish the PCC rules and the QoS rules according to the access network information corresponding to different IP-CAN sessions.
Specifically, in the invention, the vPCRF reports access network information corresponding to the IP-CAN session to the hPCRF; and the hPCRF formulates a PCC rule for the IP-CAN conversation according to the access network information.
The Access network information includes an IP-CAN Type and/or a RAT (Radio Access Type).
The hPCRF can also make PCC rules according to subscription data and/or network policies.
Preferably, the vPCRF encapsulates the access network information corresponding to the IP-CAN session in the S9 sub-session corresponding to the IP-CAN session, sends the access network information to the hPCRF, and reports the access network information corresponding to the IP-CAN session; or,
preferably, the vprf identifies the access network information corresponding to the IP-CAN session by using a BBERF address corresponding to the IP-CAN session, and the vprf encapsulates the BBERF address corresponding to the IP-CAN session in an S9 sub-session corresponding to the IP-CAN session, sends the BBERF address to the hPCRF, and reports the access network information corresponding to the IP-CAN session.
Preferably, the hPCRF further formulates QoS rules according to the PCC rules.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example one
This embodiment describes a flowchart of a UE accessing and establishing an IP-CAN session through a trusted non-3 GPP access gateway in a roaming scenario of a home route, where a PMIPv6 protocol is used between the access gateway and a P-GW, and the specific steps are as follows:
step S501, BBERF receives the request message for establishing IP-CAN session, the message carries user identification NAI (Network Access Identifier), PDN identification APN (Access Point Name );
step S502, BBERF sends a request message for establishing a gateway control session to vPCRF, wherein the message contains a user identifier NAI, a PDN identifier APN, a BBERF address, an IP-CAN type and/or an RAT type. The message requests that the established Diameter session be denoted as gateway control session (Gxx session) 1;
step S503, the vPCRF judges that the user is a roaming user according to the NAI and judges that no S9 is established for the user, so the vPCRF sends an S9 session establishment indication message to the hPCRF and requests to establish a sub-session 1. The message carries a user identifier, a PDN identifier, an IP-CAN type and/or an RAT type, wherein the IP-CAN type and/or the RAT type are contained in the subscription 1;
other methods may also be employed to implement: for example, the IP-CAN type and/or RAT type are identified by the BBERF address during the transmission, and then the BBERF address is included in the session1, so that the hPCRF CAN determine the IP-CAN type and/or RAT type of the IP-CAN session.
Step S504, if the hPCRF does not have the subscription information related to the user, the hPCRF and SPR acquire the subscription information in an interactive manner;
step S505, the hPCRF makes a policy decision according to one or more of the following information: the subscription information obtained from SPR, the information reported from BBERF (such as access network information (including IP-CAN type and/or RAT type) and the information pre-configured by PCRF (such as network policy) make default policy PCC rules and corresponding QoS rules for the IP-CAN session requested to be established by UE, because the access network information is related to the IP-CAN, PCRF CAN make different policies for different IP-CAN sessions established by UE according to different access network information, the hPCRF returns S9 session establishment confirmation message to vPCRF, and the QoS rules are contained in Subsession 1;
step S506, the vPCRF sends the QoS rule to the BBERF through a gateway control session establishment confirmation message. BBERF installs QoS rule;
step S507, the gateway where the BBERF resides sends a request message for establishing the IP-CAN session to the gateway where the PCEF resides, wherein the message carries the NAI and the APN;
step S507 may be transmitted simultaneously with step S502.
Step S508, the gateway where the PCEF resides allocates an IP address to the IP-CAN session requested to be established by the UE. The PCEF sends an IP-CAN session establishment indication message to the hPCRF, wherein the message carries the NAI, the APN and the IP address. The Diameter session that the message requests to establish is denoted Gx session 1;
in step S509, the hPCRF associates Gx session1 with subscription 1 according to the NAI and the APN. The hPCRF sends the PCC rule formulated in step S505 to the PCEF;
step S510, the PCEF installs the PCC rules. The gateway where the PCEF resides returns an IP-CAN session establishment response message to the BBERF;
step S511, the BBERF returns a response message for establishing the IP-CAN session;
when the UE decides to initiate the establishment of a second IP-CAN session,
in a multi-access scenario, a BBERF 'of another access network sends a gateway control session establishment request message (a Diameter session requested to be established is a gateway control session 2) to a vPCRF, where the message carries an NAI, an APN', a BBERF address ', an IP-CAN type', and/or an RAT type ', and the vPCRF sends an S9 session modification indication message to an hPCRF, and requests to establish a sub-session subscription 2, where the IP-CAN type' and/or the RAT type 'are included in the sub-session 2 and identified by the BBERF address'. The hPCRF determines the policy of the second IP-CAN session according to the subscription information, the network policy, the IP-CAN type 'and/or the RAT type', and sends the policy of the second IP-CAN session to the vprf via the session2 of the S9 session modification message. And the vPCRF sends the QoS rule to the BBERF' through a gateway control session establishment confirmation message of the Gxx session 2.
Similarly, other methods may be used to: for example, IP-CAN type ' and/or RAT type ' are identified by BBERF address when they are transmitted, and then BBERF address ' is included in the session1, so that hPCRF CAN determine IP-CAN type ' and/or RAT type ' of the second IP-CAN session.
Example two
This embodiment describes a flowchart of establishing an IP-CAN session by accessing a 3GPP access gateway by a UE in a local breakout roaming scenario, which includes the following specific steps:
step S601, a gateway where PCEF resides receives the established IP-CAN session request message and allocates an IP address for the IP-CAN session;
step S602, the PCEF sends an IP-CAN session establishment indication message to the vPCRF, wherein the message carries an NAI, an APN, a PCEF address, an IP-CAN type, a RAT type and/or an IP address. The Diameter session that the message requests to establish is denoted Gx session 1;
step S603, the vPCRF judges that the user is a roaming user according to the NAI and does not establish an S9 session for the user, so that the vPCRF sends an S9 session establishment indication message to the hPCRF and requests to establish a sub-session 1, and the IP-CAN type and/or the RAT type are contained in the sub-session 1;
step S604, if the hPCRF does not have the subscription information related to the user, the hPCRF interacts with SPR to acquire the subscription information;
step S605, the hPCRF makes a policy decision according to one or more of the following information: the subscription information obtained from SPR, the information reported from PCEF (such as access network information (including IP-CAN type and/or RAT type) and the information pre-configured by PCRF (such as network policy) CAN be used for making default policy PCC rule and corresponding QoS rule for the IP-CAN session requested to be established by UE, because the access network information is related to IP-CAN, PCRF CAN make different policies for different IP-CAN sessions established by UE according to different access network capability information, the hPCRF returns S9 session establishment confirmation message to vPCRF, and the PCC rule is contained in Subsession 1;
step S606, the vPCRF sends the PCC rule to the PCEF through the IP-CAN session establishment confirmation message of Gx session1, and the PCEF installs the PCC rule;
step S607, the gateway where the PCEF resides returns a response message for establishing the IP-CAN session.
In a multi-access scenario, a PCEF 'sends an IP-CAN session establishment request message (a Diameter session requested to be established is Gx session 2) to a vppcrf, where the message carries an NAI, an APN', an IP-CAN type 'and/or a RAT type', and the vpcf sends an S9 session modification indication message to the hPCRF and requests to establish a sub-session subscription 2, where the IP-CAN type 'and/or the RAT type' are included in the subscription 2. The hPCRF determines the policy of the second IP-CAN session according to the subscription information, the network policy, the IP-CAN type 'and/or the RAT type', and sends the policy of the second IP-CAN session to the vprf via the session2 of the S9 session modification message. The vPCRF sends the policy to the PCEF' through an IP-CAN session establishment confirmation message of Gx session 2.
The policy charging control system supporting multi-access of the embodiment of the invention comprises a vPCRF and an hPCRF,
the vPCRF is used for reporting access network information corresponding to the IP-CAN session to the hPCRF;
the hPCRF is used for making a PCC rule for the IP-CAN conversation according to the access network information.
Preferably, the access network information includes an IP-CAN type and/or a RAT type.
Preferably, the hPCRF is further configured to formulate PCC rules according to subscription data and/or network policies.
Preferably, the vppcrf is further configured to encapsulate the access network information corresponding to the IP-CAN session in the S9 sub-session corresponding to the IP-CAN session, send the encapsulated access network information to the hPCRF, and report the access network information corresponding to the IP-CAN session.
Preferably, the vprf is further configured to identify access network information corresponding to an IP-CAN session by using a BBERF address corresponding to the IP-CAN session, encapsulate the BBERF address corresponding to the IP-CAN session in an S9 sub-session corresponding to the IP-CAN session, send the BBERF address to an hPCRF, and report the access network information corresponding to the IP-CAN session; the hPCRF is further used for acquiring access network information corresponding to the IP-CAN session according to the received BBERF address.
Preferably, the hPCRF is further configured to formulate QoS rules according to the PCC rules.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A policy charging control method supporting multiple accesses includes:
a visiting policy control and charging rule function entity (vPCRF) reports access network information corresponding to an IP connection access network (IP-CAN) session to a hometown policy control and charging rule function entity (hPCRF);
and the hPCRF formulates a Policy and Charging Control (PCC) rule for the IP-CAN session according to the access network information.
2. The method of claim 1,
the access network information includes an IP-CAN type and/or a Radio Access Type (RAT).
3. The method of claim 1,
the hPCRF also formulates PCC rules according to subscription data and/or network policies.
4. The method according to any one of claims 1 to 3,
in the step of reporting the access network information corresponding to the IP-CAN session to the hPCRF,
and the vPCRF encapsulates the access network information corresponding to the IP-CAN session in the S9 sub-session corresponding to the IP-CAN session, sends the access network information to the hPCRF and reports the access network information corresponding to the IP-CAN session.
5. The method according to any one of claims 1 to 3,
in the step of reporting the access network information corresponding to the IP-CAN session to the hPCRF,
the vPCRF identifies access network information corresponding to the IP-CAN session by using a BBERF address corresponding to the IP-CAN session, and the vPCRF encapsulates the BBERF address corresponding to the IP-CAN session in an S9 sub-session corresponding to the IP-CAN session, sends the BBERF address to the hPCRF and reports the access network information corresponding to the IP-CAN session.
6. The method according to any one of claims 1 to 3,
the hPCRF further formulates quality of service (QoS) rules according to the PCC rules.
7. A policy charging control system supporting multi-access comprises a vPCRF and an hPCRF, and is characterized in that,
the vPCRF is used for reporting access network information corresponding to the IP-CAN session to the hPCRF;
the hPCRF is used for making a PCC rule for the IP-CAN conversation according to the access network information.
8. The system of claim 7,
the access network information includes an IP-CAN type and/or a RAT.
9. The method of claim 7,
the hPCRF is further used for formulating PCC rules according to subscription data and/or network policies.
10. The system according to any one of claims 7 to 9,
and the vPCRF is further used for encapsulating the access network information corresponding to the IP-CAN session in the S9 sub-session corresponding to the IP-CAN session, sending the encapsulated access network information to the hPCRF and reporting the access network information corresponding to the IP-CAN session.
11. The system according to any one of claims 7 to 9,
the vPCRF is further used for identifying access network information corresponding to the IP-CAN session by using a BBERF address corresponding to the IP-CAN session, encapsulating the BBERF address corresponding to the IP-CAN session in an S9 sub-session corresponding to the IP-CAN session, sending the BBERF address to the hPCRF, and reporting the access network information corresponding to the IP-CAN session;
the hPCRF is further used for acquiring access network information corresponding to the IP-CAN session according to the received BBERF address.
12. The system according to any one of claims 7 to 9,
the hPCRF is further configured to formulate a QoS rule according to the PCC rule.
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| CN104853332A (en) * | 2014-02-17 | 2015-08-19 | 中兴通讯股份有限公司 | Visit policy control method and device |
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| CN104853332A (en) * | 2014-02-17 | 2015-08-19 | 中兴通讯股份有限公司 | Visit policy control method and device |
| WO2015120731A1 (en) * | 2014-02-17 | 2015-08-20 | 中兴通讯股份有限公司 | Visit policy control method and device |
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