WO2011006414A1 - Système de commande de politique et procédé de commande de politique dans un système de communication - Google Patents

Système de commande de politique et procédé de commande de politique dans un système de communication Download PDF

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Publication number
WO2011006414A1
WO2011006414A1 PCT/CN2010/074266 CN2010074266W WO2011006414A1 WO 2011006414 A1 WO2011006414 A1 WO 2011006414A1 CN 2010074266 W CN2010074266 W CN 2010074266W WO 2011006414 A1 WO2011006414 A1 WO 2011006414A1
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Prior art keywords
keep
alive
policy
module
network element
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PCT/CN2010/074266
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English (en)
Chinese (zh)
Inventor
吴中华
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中兴通讯股份有限公司
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Publication of WO2011006414A1 publication Critical patent/WO2011006414A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Definitions

  • the present invention relates to policy control techniques, and more particularly to a policy control method and system for implementing a policy control center to uniformly manage a keep alive policy. Background technique
  • PCC Policy Control and Charging
  • IP Internet Protocol
  • PCC Policy Control and Charging
  • the PCC is used to complete resource admission control. It mainly implements certain quality of service control and charging policy control for the characteristics of the mobile access network.
  • the main functions provided by PCC include: The user's customized information implements policy control and service data flow based charging control.
  • the PCC is located between the service control layer and the access layer, or between the service control layer and the bearer layer, and shields the service control layer from the specific technology and topology information of the access layer or the bearer layer.
  • the PCC receives the service-related Quality of Service (QoS) authorization parameters from the service control layer, and then combines the QoS authorization parameters with the admission control policy, the network topology information, and the QoS authorization parameters related to the service. It is converted into IP QoS parameters, and then the converted IP QoS parameters are provided to the relevant access layer or bearer layer node and service gateway node.
  • QoS Quality of Service
  • IP QoS parameters IP QoS parameters
  • FBC Flow Based Charging
  • IMS IP Multimedia System
  • P-CSCF Packet Control Function
  • PCEF Policy and Charging Enforcement Function
  • billing execution function entity the bearer control device
  • PCRF Policy and Charging Rule Function
  • the policy of keeping the same IMS call between the two network devices is inconsistent, it may cause the normal IMS call to be misidentified as invalid, thereby erroneously releasing related resources.
  • the PCRF when the IMS call is ongoing, the PCRF expects the PCEF to request the PCRF to refresh the relevant PCC rules every 3 minutes, and the PCEF is configured to request it every 5 minutes. Obviously, this inconsistency will cause the PCRF to think that the IMS call is abnormal and released.
  • Related resources eventually causing the IMS call to abort. For example, the Gx interface session of the same call is saved once every 5 minutes, but the corresponding Rx interface session is kept live every 1 minute.
  • the technical problem to be solved by the present invention is to provide a policy control method and a policy control system in a communication system to solve the problem of call loss risk and efficiency degradation caused by the inconsistency caused by the decentralized customization of the keep-alive strategy in the prior art.
  • an aspect provides a policy control method in a communication system, where the method includes the following steps:
  • the policy control center generates a keep-alive policy according to the information used to formulate the keep-alive policy; the policy control center distributes the generated keep-alive policy to the corresponding network element; the network element receives the keep-alive policy, and Checking the keep-alive body in the keep-alive policy; when the keep-alive body is the network element itself, the network element performs the keep-alive policy; or
  • the network element transmits the keep-alive policy to the keep-alive body, and the keep-alive body executes the keep-alive policy.
  • Another aspect provides a policy control system that includes:
  • a policy control center configured to generate a keep-alive policy according to information used to formulate a keep-alive policy; and distribute the keep-alive policy;
  • a network element connected to the policy control center, configured to receive the keep-alive policy, and check the keep-alive body in the keep-alive policy; when the keep-alive body is the network element itself, The network element performs the keep-alive policy; or when the keep-alive body is not the network element itself, the network element transmits the keep-alive policy to the keep-alive body, and the keep-alive body Perform the keep-alive strategy.
  • a policy control system comprising:
  • a policy and charging rule function entity configured to generate a keep-alive policy according to information used to formulate a keep-alive policy; and distribute the keep-alive policy;
  • the policy and charging execution function entity communicates with the policy and charging rule function entity through the Gx interface, and is configured to receive the keep-alive policy, and check the keep-alive body in the keep-alive policy; When the subject is itself, the keep-alive policy is executed; or when the keep-alive body is not itself, the keep-alive policy is delivered to the keep-alive body, and the keep-alive body performs the guarantee Live strategy; and Applying a functional entity, communicating with the policy and charging rule function entity through the Rx interface, for receiving the keep-alive policy, and checking the keep-alive body in the keep-alive policy; when the keep-alive body is itself And executing the keep-alive policy; or when the keep-alive body is not itself, the element transmits the keep-alive policy to the keep-alive body, and the keep-alive body executes the keep-alive policy.
  • the policy control method and the policy control system in the communication system of the present invention uniformly formulate a keep-alive strategy through a policy control center (such as a PCRF), and centrally manage and distribute the keep-alive strategy by a policy control center (such as a PCRF), thereby avoiding the prior art.
  • a policy control center such as a PCRF
  • the keep-alive policy is generated and distributed by the policy control center (such as PCRF)
  • the modification of the keep-alive strategy has also become easier.
  • FIG. 1 is a structural block diagram of a policy control system of the present invention
  • FIG. 2 is a schematic structural diagram of an embodiment of a policy control system applied to an IP multimedia system by a policy control system according to the present invention
  • FIG. 3 is a flowchart of a method for controlling a policy in a communication system according to the present invention.
  • FIG. 5 is a flow chart of message interaction signaling of a VoIP service call flow according to Embodiment 2 of a policy control method in a communication system according to the present invention
  • FIG. 6 is a flow chart of message interaction signaling of the VoIP service keep-alive policy triggered by the network management triggering in the communication system of the present invention. detailed description
  • the present invention provides a method and system for controlling a policy in a communication system.
  • the policy control system uniformly generates and delivers a keep-alive strategy to avoid the risk of loss of call loss and efficiency.
  • the keep-alive strategy is composed of the following:
  • Policy name Used to uniquely identify a keep-alive policy
  • the main body of the keep-alive is the implementer of the keep-alive strategy, which is generally a kind of network equipment, such as PCRF, which can uniquely identify a keep-alive subject by "type + identification";
  • Keep-alive object is the implementer of the keep-alive strategy. Generally, it is a kind of network equipment, such as PCEF.
  • the "type + logo" can uniquely identify a keep-alive object.
  • the keep-alive body and the keep-alive object are relative.
  • the PCRF can be used as a keep-alive body in one keep-alive strategy and as a keep-alive object in another keep-alive strategy.
  • the protection object is an association between the protection subject and the keep-alive object. There may be multiple keep-alive objects between the keep-alive subject and the keep-alive object. For example, the PCRF and the PCEF can be accessed for each UE. Establish a Gx interface IPC AN (network camera) session, and each bearer can establish multiple bearers in each IPC AN session. Each bearer can implement multiple PCC rules.
  • the keep-alive object can be a link, a session, a bearer, a media stream, etc., and the keep-alive object is identified by a certain identifier and method, such as a link number, a session identifier, a media stream classifier, and the like.
  • a "guarantee object" can be uniquely identified by "type + identification";
  • Keep-alive method is a way for the keep-alive body to let the keep-alive object know that it still maintains a protected object. There are two types of keep-alive methods:
  • Active keep-alive method The characteristic of such a method is that the keep-alive subject should actively interact with the keep-alive object, so that the other party knows that he still maintains a keep-alive object, for example, the keep-alive entity actively sends the protected object to the keep-alive object.
  • the keep-alive message, the keep-alive body can periodically send such keep-alive messages, or can send such keep-alive messages periodically after no other service messages need to be sent, when the keep-alive object receives the keep-alive subject for a certain period of time After the business message or keep-alive message of the keep-alive object, it is considered The keep-alive body is still maintaining a keep-alive object.
  • Passive keep-alive method The characteristic of such a method is that the keep-alive entity passively interacts with the keep-alive object, for example, the keep-alive entity passively responds to the keep-alive request message of the keep-alive object and sends a keep-alive response message, when the keep-alive object is a certain
  • the keep-alive object can still assume that the keep-alive subject is still alive when it receives the keep-alive response message of the keep-alive subject within a certain period of time after issuing the keep-alive request.
  • the method of measurement is the method by which the keep-alive body determines whether the keep-alive object continues to survive.
  • the method of measuring live can also be divided into two categories:
  • Active measurement method The characteristic of this method is that the keep-alive subject should actively interact with the keep-alive object periodically, or periodically check the status of the keep-alive object to the third party to determine whether the keep-alive object is still alive.
  • Passive measurement method The characteristic of such method is that the keep-alive entity passively waits for the keep-alive object or the third party to notify the keep-alive object to be inactivated, or the keep-alive subject finds that the keep-alive object does not interact with it for a certain period of time. The message can be considered that the keepalive object has been inactivated.
  • the inactivation processing method is a processing method after the keep-alive subject detects that the keep-alive object has been deactivated, for example, releasing related resources, or alarming, recording an abnormal log, and the like.
  • the keep-alive method and the measurement method in the keep-alive strategy should describe the parameters required for the implementation of the method. For example, when using the active keep-alive method that periodically sends the keep-alive message, the time period for keeping the keep-alive message is explained, and the periodicity is used. When detecting a passive measurement method in which the keep-alive object interacts with the keep-alive subject, the detection period is explained.
  • the policy control system for centralized management of the keep-alive strategy of the present invention is described in detail below.
  • the policy control system in the communication system includes a policy control center 1 and a network element 2.
  • FIG. 1 is a structural block diagram of a policy control system according to the present invention.
  • the policy control system includes a policy control center 1 configured to generate a keep-alive policy according to information used to formulate a keep-alive policy; and distribute the keep-alive policy.
  • the network element 2 connected to the policy control center 1, for receiving the keep-alive policy, and checking the keep-alive body in the keep-alive policy; when the keep-alive entity is the network When the element itself, the network element executes the keep-alive policy; or when the keep-alive body is not the network element itself, the network element transmits the keep-alive policy to the keep-alive host And the keep-alive body executes the keep-alive policy.
  • the policy control center includes:
  • the obtaining module 101 is configured to obtain the service information of the call, the user access information, the user subscription information, the bearer link information, the network load information, and the rule policy configured by the PCRF itself.
  • the policy setting module 102 is connected to the obtaining module 101. And for formulating a keep-alive strategy according to the information acquired by the obtaining module;
  • the policy sending module 103 is connected to the policy setting module 102, and is configured to send a keep-alive policy formulated by the policy formulating module to the neighboring network element.
  • the policy control center 1 further includes:
  • the keep-alive module 104 is connected to the policy formulation module 102, and is configured to implement the keep-alive method specified in the keep-alive strategy according to the established keep-alive policy;
  • the activity measurement module 105 is connected to the policy formulation module 102, and is configured to implement a measurement method specified in the keep-alive strategy according to the established keep-alive policy;
  • the deactivation processing module 106 is connected to the policy formulation module 102 and the measurement module 105, and is configured to implement a keep-alive strategy to implement an inactivation processing method specified in the keep-alive strategy.
  • the network element 2 includes:
  • a reporting module 201 configured to report, to the policy control center, information used to formulate a keep-alive policy
  • the receiving module 202 is configured to receive a keep-alive policy from the policy control center.
  • the network element keep-alive module 203 is connected to the receiving module 202, and is configured to implement a keep-alive method of the network element specified in the keep-alive policy according to the received keep-alive policy;
  • the network element measurement module 204 is connected to the receiving module 202, and configured to implement a living method of the network element specified in the keep-alive policy according to the received keep-alive policy;
  • the network element deactivation processing module 205 is connected to the receiving module 202 and the measurement and activity module 204, and is connected to the receiving module 202 by using the transmitting module 206, and is used to keep the keep-alive body received by the receiving module from its own keep-alive strategy. Passed to the corresponding keep-alive body.
  • the policy control system according to the present invention is applied in an IP multimedia system to implement centralized management of the keep alive policy.
  • the embodiment of the present invention expands the existing PCC architecture.
  • PCRF can construct a keep-alive strategy
  • Rx, Gx, Gxx interfaces can transmit keep-alive strategies
  • AF, PCRF, PCEF can execute Keep alive strategy.
  • the policy control system includes AF, PCRF, PCEF, and PCRF and PCEF communicate through the Gx interface, and PCRF and AF communicate through the Rx interface.
  • the extended PCC architecture of the embodiment of the present invention is described in detail below.
  • FIG. 2 it is an embodiment of a policy control system applied to an IP multimedia system of the policy control system of the present invention, that is, a schematic structural diagram of an extended PCC architecture.
  • the PCRF formulates and distributes the keep-alive policy of each network element.
  • Other network elements such as AF, PCEF, and UE, receive or forward the keep-alive policy, and each network element performs a keep-alive policy assigned by the PCRF to itself.
  • the control system includes:
  • PCRF Policy and Charging Rules Function Entity
  • the policy and charging execution function entity 20 communicates with the policy and charging rule function entity 10 through the Gx interface, and is configured to receive the keep-alive policy and check the keep-alive body in the keep-alive policy; When the keep-alive body is the network element itself, the network element performs the keep-alive policy; or when the keep-alive body is not the network element itself, the network element uses the keep-alive policy Passed to the keep-alive body, and the keep-alive body performs the keep-alive strategy; and
  • the PCRF 10 includes:
  • the first obtaining module 11 is configured to obtain service information of the call, user access information, user subscription information, bearer link information, network load information, and a rule policy configured by the PCRF, and the information used to formulate a keep-alive policy;
  • the policy making module 12 is connected to the first obtaining module, and configured to formulate a keep-alive policy according to the information acquired by the first acquiring module;
  • the policy sending module 13 is connected to the policy making module, and is configured to send a keep-alive policy formulated by the policy making module to the neighboring network element.
  • the PCRF 10 further includes:
  • the first keep-alive module 14 is connected to the policy-making module, and is configured to implement a keep-alive method of the policy and charging rule function entity specified in the keep-alive policy according to the established keep-alive policy;
  • the live module 15 is connected to the policy formulation module, and is configured to implement a method for measuring the policy and charging rule function entity specified in the keep-alive policy according to the established keep-alive policy; and the first inactivation processing module 16 And the policy-making module and the first measurement module are connected, and the activity-preserving policy is used for formulating, and the deactivation processing method of the policy and charging rule function entity specified in the keep-alive policy is implemented.
  • the PCEF 20 includes:
  • the first reporting module 21 is configured to report information to the policy and charging rule function entity 10; the first receiving module 22 is configured to receive a keep-alive policy from the policy and charging rule function entity 10;
  • the second keep-alive module 23 is connected to the receiving module 22, and is configured to implement a policy for keeping a policy and a charging execution function of the charging execution function entity according to the received keep-alive policy;
  • the second measurement module 24 is connected to the receiving module 22, and is configured to implement a policy for determining a policy and a charging execution function entity in the keep-alive policy according to the received keep-alive policy;
  • the second inactivation processing module 25 is connected to the first receiving module 22 and the second measuring module 24, and is configured to implement the policy and the charging execution function entity specified in the keep-alive policy according to the received keep-alive policy. Live processing method.
  • the first delivery module 26 is connected to the first receiving module 22, and is configured to transmit the keep-alive policy received by the first receiving module to the corresponding keep-alive body.
  • the AF30 includes:
  • the second reporting module 31 is configured to report information to the policy and charging rule function entity 10;
  • the second receiving module 32 is configured to receive a keep-alive policy from the policy and charging rule function entity 10;
  • the third keep-alive module 33 is connected to the receiving module 32, and is configured to implement a keep-alive method of the application function entity specified in the keep-alive policy according to the received keep-alive policy;
  • the third measurement module 34 is connected to the second receiving module 32, and is configured to implement a measurement method of the application function entity specified in the keep-alive policy according to the received keep-alive policy;
  • the third inactivation processing module 35 is connected to the second receiving module 32 and the third measuring module 34, and is configured to implement a deactivation processing method of the application function entity specified in the keep-alive policy according to the received keep-alive policy.
  • the second delivery module 36 is connected to the second receiving module 32, and is configured to transmit the keep-alive policy received by the second receiving module to the corresponding keep-alive body.
  • the PCRF comprehensively decides various keep-alive strategies based on device information, user information, service information, network load conditions, and application-specific policies, and distributes them to the corresponding keep-alive objects. That is, when the PCRF and the neighboring network element are chained, the PCRF can distribute the keepalive policies at the network element level and the link level to neighboring network elements. For example, when the PCRF and the P-CSCF are connected to each other, the keep-alive policy of the Rx interface is transmitted, and the keep-alive policy of the Gx interface is transmitted to the PCRF and the PCEF when the link is established.
  • the embodiment of the present invention is The Gx interface and the Rx interface of the PCC architecture are extended, so that the PCRF can transmit the keep-alive policy including the keep-alive body, the keep-alive object, the keep-alive object, the keep-alive method, the living method, and the inactivation processing method to the PCEF and AF.
  • the PCRF can not only formulate the keep-alive policy of the neighboring network element and the adjacent link. Further, the PCRF can transmit the keep-alive to the non-contiguous network element by the neighboring network element.
  • the policy for example, the PCRF formulates the policy of keeping the PCEF to the UE, and distributes it to the PCEF. At the same time, the PCRF formulates the policy of keeping the UE's PCEF on the PCEF and transmits it to the UE through the PCEF. In this way, the policy of maintaining the activity between the NEs is ensured. consistency.
  • a method for centrally managing a keep-alive policy is provided, which is applied to an application entity (AF), a policy and a charging rule function entity (PCRF), a policy and a charging execution function entity (PCEF).
  • AF application entity
  • PCRF charging rule function entity
  • PCEF charging execution function entity
  • FIG. 3 a flow chart of a policy control method in the communication system of the present invention. The following steps are included in the figure:
  • Step 41 The policy control center (that is, the PCRF in this example) collects call related information, and generates a keep-alive strategy according to the information used to formulate the keep-alive policy;
  • Step 42 After receiving the keep-alive policy from the PCRF, the related network element AF and the PCEF check whether the keep-alive body of the keep-alive policy is itself (step 420), and if yes, the related gateway performs a keep-alive policy (step 421), otherwise, Passing the forwarding keep-alive policy to the corresponding keep-alive body, performing the keep-alive policy by the keep-alive body, and notifying the PCRF of the installation result and the delivery forwarding result of the keep-alive policy (step 422).
  • the related network element AF and the PCEF can receive the keep-alive policy from the PCRF by using one of the following methods: (1) The related network element AF and the PCEF send a policy request message or an authorization request message to the PCRF, and the policy control center protects according to the policy request message. The live policy is delivered, and the relevant network element receives the PCRF. The keep-alive policy returned (pull mode); (2) the related network element AF, PCEF receives the keep-alive policy actively issued by the PCRF (Push mode;);
  • the keepalive parameters of the respective external interface protocols can be translated and forwarded according to the content of the keep-alive policy, and the format and content of the original keep-alive policy of the PCRF are not necessarily required.
  • the PCRF can centrally formulate, distribute, and manage the keep-alive policy of the IMS network, and solve the problems of call loss, efficiency, and difficulty in adjusting the keep-alive strategy caused by the inconsistent dispersion of the keep-alive policies in the prior art.
  • the keep-alive policy assigned by the PCRF takes precedence over the local default keep-alive policy.
  • the related network element cannot perform the keep-alive policy assigned by the PCRF, the execution of the keep-alive policy should be reported to the PCRF.
  • the PCRF can adjust the keep-alive policy. , or allow related NEs to execute the local default keepalive policy. That is, the method further includes the following steps: After the network element fails to perform the keep-alive policy, the keep-alive body returns a report indicating that the keep-alive policy fails to the PCRF.
  • the AF When the terminal initiates a new IMS call, the AF requests the PCRF to perform authorization and resource reservation for the IMS call.
  • the PCRF determines the IMS session and the media stream according to the call information while authorizing and reserving the IMS call. Keep the policy and bring the keep-alive policy back to AF in the response message. Based on this, the AF determines how to measure and maintain the IMS session and the media stream therein.
  • the terminal establishes or modifies the media plane channel with the bearer device.
  • the bearer device of the media plane needs to obtain various policies for establishing or modifying a media channel from the PCRF, including a QoS policy, a charging policy, a keep-alive policy, and the like.
  • the bearer device on the media side can obtain these policies in two ways. One way is that the PCRF actively sends these policies to the bearer device, which is called Push mode. The other way is that the PCRF responds to the request of the bearer device and puts these policies under the policy. Send to the bearer device and become the Pull mode. After obtaining the policies, the bearer device performs QoS control, charging control, and protection on the new IMS call and the media therein according to the policy content. Live control, etc.
  • the call related information collected by the PCRF includes: (1) service information: a service category to which the call belongs, a media parameter to be established, and the PCRF can obtain the information from the AF; (2) user access information, user name identifier, IP The address, etc., the PCRF can obtain the information from the SPR; (3) User subscription information: the service category and service level that the user and the operator subscribe to, the PCRF can obtain the information from the SPR; (4) bearer link information: bearer The service classifier, the bearer usage, the QoS level of the bearer, etc., the PCRF can obtain the information from the PCEF; (5) the network load situation, the PCRF can obtain the information from neighboring network elements such as PCEF and AF; (6) the operator's The policy is preset and stored in the PCRF. The PCRF combines this information to develop a policy for the survival of the call.
  • FIG. 4 it is a flow chart of message interaction signaling of the user online process in the embodiment 1 of the policy control method in the communication system of the present invention. As shown in Figure 4, the method includes:
  • Step S401 The UE is attached to the network, and the UE sends a request message, and the default bearer is established between the request and the PCEF.
  • Step S402 The PCEF sends an authorization request message to the PCRF for the UE to request to establish a new IPC AN session with the PCRF.
  • Step S403 The PCRF finds that there is no subscription information of the user locally, and requests the subscription information of the user from the SPR.
  • Step S404 the SPR returns the subscription information of the user to the PCRF
  • Step S405 The PCRF authenticates and authorizes the user, determines the QoS policy, the charging policy, and the keep-alive policy of the default bearer, and sends the policy to the PCEF.
  • the keep-alive strategies issued by the PCRF to the PCEF include:
  • keep alive strategy KA_DEFAULT_BEARER_GX_PCEF, for PCEF to Gx The default bearer PCC rules of the interface IPCAN session are kept and live. Since the default bearer is the first bearer established by the IPCAN session and the last bearer before the IPCAN session is deleted, the keepalive of the default bearer is equivalent to the IPCAN.
  • the keepalive of the session, the strategy is defined as follows:
  • Keep-alive object ⁇ type: BEARER, ID: DEFAULT-BEARER-ID>
  • Keep-alive method active keep-alive: When there is no PCC rule on the default bearer, CCR message is sent to the PCRF every 60 seconds, and the PCC rule of the default bearer is reported. status;
  • Measurement method passive measurement: no signal is received within 3 minutes without any signaling from the PCRF regarding the default bearer of the IPCAN session.
  • the keep-alive policy KA_DEFAULT_BEARER_PCEF is used to keep the live bearer and the live bearer established between the PCEF and the UE.
  • the policy is defined as follows:
  • Measurement method Passive measurement: It is considered to be inactive when no signal is received from the UE for the default bearer within 3 minutes.
  • the keep-alive policy KA_DEFAULT_BEARER_UE is used for the keep-alive and measurement of the default bearer established between the UE and the PCEF: Strategy name: KA-DEFAULT-BEARER-UE
  • Keep-alive subject ⁇ type: UE, logo: UE-ID>
  • Measurement method Passive measurement: It is considered to be deactivated when no signal is received for the default bearer within 3 minutes.
  • Step S406 in the previous step, the PCRF simultaneously generates its own keep-alive policy KA_DEFAULT_BEARER_GX_PCRF for the default bearer of the IPC AN session, and starts to execute the keep-alive policy;
  • the keep-alive policy KA_DEFAULT_BEARER_GX_PCRF is used by the PCRF to keep the live bearer and the live bearer of the IPC AN session.
  • the policy is defined as follows:
  • CCR request passive measurement: PCEF not received within 3 minutes
  • the default CCR request of the IPC AN session is considered to be deactivated
  • Inactivation processing method terminate the IPCAN session and notify the relevant network element
  • Step S407 The PCEF receives the default bearer QoS policy and the keep-alive policy formulated by the PCRF, installs and executes the policies, notifies the UE that the default bearer is successfully established, and receives the keep-alive host as
  • the UE's keep-alive policy KA_DEFAULT_BEARER_UE is delivered to the UE. That is, the relevant network element judges After the keep-alive body is not itself, the keep-alive policy is passed to the keep-alive host UE. Therefore, the PCRF formulates a keep-alive policy for the UE, and transmits the policy to the UE through the PCEF. Consistency.
  • Step S408 the PCEF starts to execute the keep-alive policy of the IPCAN session KA_DEFAULT_BEARER_GX_PCEF and the default-protected policy KA_DEFAULT_BEARER_PCEF.
  • Step S409 The UE receives the default bearer setup success response, and starts to execute the keep-alive policy KA-DEFAULT-BEARER-UE.
  • the present invention implements a policy control method for the user to go online in the Pull mode.
  • Performing a keep-alive strategy in the above process may include:
  • the keep-alive PCEF, the UE, and the PCRF may periodically send a keep-alive message related to the keep-alive object to the keep-alive object according to an active keep-alive method in the keep-alive policy; or according to the passive keep-alive method in the keep-alive policy,
  • a CCA message is sent, such as a CCR request of the PCEF.
  • keep-alive PCEF the UE, and the PCRF periodically send the activity-test message related to the keep-alive object to the keep-alive object according to the active activity measurement method in the keep-alive policy; or according to the passive measurement method in the keep-alive policy
  • the keep-alive body waits for the keep-alive object to notify the keep-alive object to be inactivated, for example, the PCRF considers that the PCRF does not receive the CCR request for the default bearer of the IPC AN session within 3 minutes, and is considered to be inactive.
  • the method of measurement uses the passive method.
  • FIG. 5 is a flow chart of message interaction signaling of a VoIP service call flow according to Embodiment 2 of a policy control method in a communication system according to the present invention.
  • AF and PCEF use a Pull mode to receive a keep-alive policy from a PCRF, including the following. Steps:
  • Step S501 The UE sends a request message to the AF to establish a transmission of the VoIP service.
  • Step S503 The PCRF configures the subscription verification, the admission control, and the reserved resource for the VoIP service requested by the AF according to the user subscription information and the rules of the user, and generates an Rx session keep-alive policy. After the authorization and resource reservation are successful, the PCRF sends the AF to the AF. Sending an authorization success response message, and carrying a keep-alive policy KA_RX_SESSION_AF of the Rx session that the AF should perform;
  • the keep-alive policy KA_RX_SESSION_AF is used for AF to keep and measure the Rx session.
  • the policy is defined as follows:
  • Keep-alive method Active keep-alive: Send AAR request message to PCRF every 60 seconds when there is no service signaling
  • Measurement method passive measurement: no signal is received for the Rx session within 3 minutes.
  • Inactivation processing method terminate the call, notify the relevant network element, release the Rx session
  • Step S504 in the previous step, the PCRF simultaneously generates a keep-alive policy KA_RX_SESSION_PCRF of the Rx session that should be implemented by itself, and starts to execute the keep-alive policy;
  • the keep-alive policy KA_RX_SESSION_PCRF is used by the PCRF to keep and test the Rx session.
  • the policy is defined as follows:
  • Inactivation processing method release Rx session related resources, notify related network elements
  • Step S505 After receiving the authorization success response message, the AF notifies the UE that the media parameter of the VoIP service transmission has been negotiated;
  • Step S506 The AF parses the keep-alive policy KA_RX_SESSION_AF that needs to be executed by itself from the authorization success response message of the PCRF, and installs and executes the keep-alive policy;
  • Step S507 The UE initiates a request message for establishing a VoIP service bearer to the PCEF.
  • Step S509 the PCRF generates a QoS policy, a charging policy, and a keep-alive policy for the VoIP bearer, and sends the QoS policy to the PCEF.
  • KA_VOIP_BEARER_PCEF used for PCEF to keep and measure VoIP bearers.
  • the policy is defined as follows:
  • Keep-alive subject ⁇ type: UE, logo: UE-ID>
  • Keep-alive method passive keep-alive: Send bearer response message in response to UE's bearer request signaling
  • Measurement method passive measurement: considered to be inactive when no signal is received for the bearer within 1 minute
  • Inactivation processing method release VOIP bearer related resources, notify related network elements
  • the keep-alive policy KA_VOIP_BEARER_UE is used by the UE to keep the VoIP bearer alive and live: Strategy name: KA_VOIP_BEARER_UE
  • Keep-alive subject ⁇ type: UE, logo: UE-ID>
  • Keep-alive method Active keep-alive: Send bearer keep-alive request to PCEF every 20 seconds when there is no service signaling
  • Measurement method passive measurement: considered to be inactive when no signal is received for the bearer within 1 minute
  • Inactivation processing method termination VOIP
  • Keep-alive method Active keep-alive: Send CCR message to PCRF every 20 seconds when there is no service signaling, report the PCC rule status on the VoIP bearer;
  • Measurement method passive measurement: no signal is received within 1 minute when any signaling from the PCRF on the VoIP 7 of the IPC AN session is considered
  • Inactivation processing method terminate IPCAN session and terminate default bearer
  • Step S510 in the previous step, the PCRF simultaneously generates a keep-alive policy for the VoIP bearer, and starts to execute the keep-alive policy;
  • the keep-alive policy KA_VOIP_BEARER_GX_PCRF is used by the PCRF to keep and measure the VOIP bearer of the IPC AN session:
  • Keep-alive method passive keep-alive: CCA message is sent in response to PCEF's CCR request.
  • Measurement method passive measurement: It is considered to be deactivated when PCCE does not receive a CCR request for VoIP bearer of the IPC AN session within 1 minute.
  • Inactivation processing method terminate the IPCAN session and notify the relevant network element
  • Step S511 the PCEF receives the QoS policy of the VoIP bearer, the charging policy, the keep-alive policy, installs and implements the QoS policy and the charging policy, notifies the UE that the VoIP bearer has been established, and transmits the keep-alive policy KA_VOIP_BEARER_UE that the UE should perform in the response message. That is, after the relevant network element judges that the keep-alive body is not itself, the keep-alive policy is transmitted to the keep-alive host UE, and thus, the PCRF formulates a keep-alive policy for the UE, and transmits it to the UE through the PCEF, thereby ensuring Consistency of the keepalive strategy between NEs.
  • Step S512 PCEF installs and implements its own keep-alive strategy KA-VOIP-BEARER-PCEF and KA_VOIP_BEARER_GX_PCEF;
  • Step S513 the UE receives the response message that the VoIP 7 is successfully established, and starts to activate the transmission of the VoIP service flow.
  • Step S514 the UE installs and executes a keep-alive policy KA_VOIP_BEARER_UE.
  • a policy control method for a user to initiate a VoIP service in the Pull mode is implemented.
  • Performing a keep-alive strategy in the above process may include:
  • the keep-alive PCEF, the UE, and the PCRF may periodically send a keep-alive message related to the keep-alive object to the keep-alive object according to an active keep-alive method in the keep-alive policy; or according to the passive keep-alive method in the keep-alive policy,
  • the keep-alive body responds by receiving a keep-alive request message sent to the keep-alive object, for example, the PCRF sends a CCA message in response to the CCR request of the PCEF.
  • the keep-alive PCEF, the UE, and the PCRF are based on an active measurement method in the keep-alive policy. And periodically transmitting, to the keep-alive object, a measurement activity message related to the keep-alive object; or according to the passive measurement method in the keep-alive policy, the keep-alive body waits for the keep-alive object to notify the keep-alive object to be inactivated,
  • the PCRF is considered to be deactivated when it does not receive a CCR request from the PCEF for the VoIP bearer of the IPC AN session within 1 minute. In this case, the method of measurement uses the passive method.
  • FIG. 6 is a flow chart of message interaction signaling of a network management triggering modification VoIP service keep-alive policy according to Embodiment 3 of the policy control method in the communication system according to the present invention.
  • the PCRF uses Push mode to push the modified keep-alive policy. , including the following steps:
  • Step S601 The network management system adjusts the VoIP service keep-alive policy requirement by the operator, and triggers the PCRF to adjust the keep-alive period and the measurement period of the VoIP service, and respectively doubles;
  • Step S602 the PCRF actively sends a keep-alive policy adjustment request to the AF, and carries the modified keep-alive policy KA_RX_SESSION_AF;
  • Step S603 the AF receives the keep-alive policy modification request, adjusts the keep-alive policy KA_RX_SESSION_AF, and reports the policy adjustment result to the AF;
  • Step S604 the AF starts to perform the adjusted keep-alive policy KA_RX_SESSION_AF;
  • Step S605 the PCRF receives the adjustment result of the keep-alive policy KA_RX_SESSION_AF of the AF report, confirms that the keep-alive policy is successfully adjusted, starts to adjust and executes its own keep-alive strategy KA-RX - SESSION - PCRF;
  • Step S606 the PCRF sends a keep-alive policy adjustment request to the PCEF, carrying the modified keep-alive policy KA_VOIP_BEARER_GX_PCEF, KA_VOIP_BEARER_PCEF, KA_VOIP_BEARER_UE;
  • Step S607 the PCEF delivers the modified keep-alive policy KA_VOIP_BEARER_UE to
  • Step S608 the UE installs the modified keep-alive policy KA_VOIP_BEARER_UE, and reports the policy adjustment result to the PCEF;
  • Step S609 the UE starts to perform the adjusted keep-alive policy KA_VOIP_BEARER_UE;
  • Step S610 the PCEF reports the adjustment result of the keep-alive policy KA_VOIP_BEARER_GX_PCEF, KA_VOIP_BEARER_PCEF, KA_VOIP_BEARER_UE;
  • Step S611 the PCRF confirms that the keep-alive policy KA_VOIP_BEARER_GX_PCEF, KA_VOIP_BEARER_PCEF, KA_VOIP_BEARER_UE is successfully adjusted, and starts to perform the adjusted keep-alive policy KA_VOIP_BEARER_GX_PCRF;
  • a policy control method for modifying a VoIP service keep-alive policy initiated by the network management in the Push mode is implemented.
  • the keep-alive strategy in the above embodiment is as described in the above embodiment, and the process of the keep-alive and the measurement of the specific execution strategy is the same as that described in Embodiment 2 above.
  • the PCRF centrally generates and distributes a keep-alive strategy, which solves the inconsistency caused by the decentralized customization of the keep-alive strategy in the prior art, and the resulting loss of call loss risk and efficiency, and enhances the policy control. Ability, and make it easy to modify the keep-alive strategy.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé de commande de politique dans un système de communication, comprenant les opérations suivantes : le centre de commande de politique génère une politique d'entretien selon les informations utilisées pour la formulation de la politique d'entretien; le centre de commande de politique délivre la politique d'entretien générée aux éléments de réseau correspondants; les éléments de réseau reçoivent la politique d'entretien, et vérifient le corps principal d'entretien dans la politique d'entretien; si le corps principal d'entretien est l'élément de réseau lui-même, l'élément de réseau exécute la politique d'entretien; ou si le corps principal d'entretien n'est pas l'élément de réseau lui-même, l'élément de réseau transmet les politiques d'entretien au corps principal d'entretien, et le corps principal d'entretien exécute la politique d'entretien. La présente invention décrit également un système de commande de politique de mise en œuvre du procédé mentionné ci-dessus. La politique d'entretien de la présente invention est générée et délivrée de façon intensive par le centre de commande de politique (par exemple, PCRF), de telle sorte que la modification de la politique d'entretien devient plus facile.
PCT/CN2010/074266 2009-07-16 2010-06-22 Système de commande de politique et procédé de commande de politique dans un système de communication WO2011006414A1 (fr)

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