WO2018035741A1 - 策略控制方法、网元、系统及存储介质 - Google Patents

策略控制方法、网元、系统及存储介质 Download PDF

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Publication number
WO2018035741A1
WO2018035741A1 PCT/CN2016/096511 CN2016096511W WO2018035741A1 WO 2018035741 A1 WO2018035741 A1 WO 2018035741A1 CN 2016096511 W CN2016096511 W CN 2016096511W WO 2018035741 A1 WO2018035741 A1 WO 2018035741A1
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Prior art keywords
network element
policy
plane network
connection
forwarding
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PCT/CN2016/096511
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English (en)
French (fr)
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李永翠
倪慧
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华为技术有限公司
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Priority to CN201680081964.0A priority Critical patent/CN108702655B/zh
Priority to PCT/CN2016/096511 priority patent/WO2018035741A1/zh
Priority to EP16913765.0A priority patent/EP3487215B1/en
Priority to CN202010578930.0A priority patent/CN112218345B/zh
Priority to EP21168280.2A priority patent/EP3920591A1/en
Publication of WO2018035741A1 publication Critical patent/WO2018035741A1/zh
Priority to US16/283,198 priority patent/US11240711B2/en
Priority to US17/561,509 priority patent/US11825356B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0894—Policy-based network configuration management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0895—Configuration of virtualised networks or elements, e.g. virtualised network function or OpenFlow elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/24—Accounting or billing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels

Definitions

  • the present invention relates to the field of communications, and in particular, to a policy control method, a network element, a system, and a storage medium.
  • the Evolved Packet System is divided into two parts: the access network and the core network.
  • the system architecture in the non-roaming scenario is shown in Figure 1.
  • Its radio access network is an evolved Evolved Universal Terrestrial Radio Access Network (E-UTRAN) for implementing wireless access related functions.
  • E-UTRAN evolved Evolved Universal Terrestrial Radio Access Network
  • the Evolved Packet Core (EPC) key logical network elements include a Mobility Management Entity (MME), a Serving Gateway (S-GW), and a Packet Data Network Gateway (Packet Data Network Gateway). P-GW), Home Subscriber Server (HSS).
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Packet Data Network Gateway Packet Data Network Gateway
  • HSS Home Subscriber Server
  • the MME mainly performs processing of signaling plane functions, such as user authentication, handover, mobility management of idle state terminals, user context, and bearer management.
  • the HSS stores user subscription information.
  • the S-GW is a user plane functional entity, completes the routing and forwarding of packet data, and acts as a data anchor in the 3GPP system to terminate the E-UTRAN interface. At the same time, it is also localized in the E-UTRAN handover scenario in a certain geographical area.
  • the P-GW is a gateway that connects to an external data network and is a user plane anchor between the 3GPP access network and the non-3GPP access network.
  • a User Equipment can access an external PDN by establishing a Packet Data Network (PDN) connection by connecting to the P-GW.
  • PDN Packet Data Network
  • PDNs may be the Internet, a virtual private network (VPN), an IP Multi-media Service (IMS) network, or a Wireless Application Protocol (WAP) network provided by an operator.
  • VPN virtual private network
  • IMS IP Multi-media Service
  • WAP Wireless Application Protocol
  • the logical network elements S-GW and P-GW may be separated or combined. Except for individual cases (such as roaming), the logical network elements S-GW and P-GW are all deployed in one.
  • the network protocol (IP) address of the user equipment is provided by the P-GW. Therefore, after the UE moves, the IP address and the uplink and downlink path of the UE service flow need to be anchored at the P-GW to ensure the continuity of the IP. as shown in picture 2.
  • IP network protocol
  • Uplink, UL and downlink (DL) paths of the service flow of the UE after the mobile are long, and the delay is long, resulting in low user experience quality.
  • the existing EPS system supports multiple PDN access, that is, the UE can simultaneously access multiple PDNs through multiple P-GWs or one P-GW, and the EPS support UE can simultaneously access the same PDN through multiple P-GWs. .
  • FIG. 2a is a schematic diagram of multiple PDN connections after the UE moves.
  • the forwarding plane network element may be a PGW or other IP anchor point in the EPC network.
  • the PDN connection 1 and the PDN connection 2 are PDN connections after the UE moves, that is, after the UE moves, access the PDN network through the PDN connection 1, or access the PDN network through the PDN connection 2.
  • PDN connection 3 is a newly created PDN connection. The UE implements the optimization of the uplink and downlink paths of the new service through the newly established PDN connection 3.
  • DMM Distributed Mobility Management proposes that multiple IP connections can be established nearby, that is, multiple PDN connections are established, so that different forwarding planes are selected nearby.
  • the element is connected to the same PDN network to optimize the routing path.
  • the location of the anchor gateway of each PDN connection is different, and the policy and charging enforcement function (PCEF) is located at the anchor gateway.
  • PCEF policy and charging enforcement function
  • the same UE has multiple policy and charging function execution points, which may result in some policies that need to be controlled across PDN connections, such as APN-AMBR and UE granular charging policies. That is, when multiple PDN connections are established between the UE and the PDN, and the PDNs are connected to the PDN through different forwarding planes, how to control the multi-PDN connection granularity of the user packets, the prior art does not Give a solution.
  • the embodiments of the present invention provide a policy control method, a network element, a system, and a storage medium to implement certain policies that need to be controlled across PDN connections.
  • a policy control method in a first aspect, establishes, by the UE, a first data network (DN) connection with the first forwarding plane network element as an anchor point; when the control plane network element receives The handover notification message of the UE determines whether the second forwarding plane network element serves the UE, or when the control plane network element establishes the second DN connection with the second forwarding plane network element as the anchor point for the UE, the control plane network element is updated.
  • the forwarding path of the first DN connection is such that the forwarding path of the updated first DN connection passes through the second forwarding plane network element, and the second forwarding plane network element performs policy control on the packet of the first DN connection.
  • control plane network element updates the forwarding path of the first DN connection by using the forwarding path migration, so that the updated forwarding path of the first DN connection passes through the second forwarding plane network element, and the second forwarding plane network element Policy control is performed on the packets of the first DN to implement multi-PDN connection granularity control on the packets of the UE.
  • the control plane network element updates the forwarding path of the first DN connection, and after the updated forwarding path of the first DN connection passes the second forwarding plane network element, the control plane network element forwards to the second forwarding.
  • the network element sends a session establishment request message or a redirect response message, and the session establishment request message or the redirect response message is used to indicate that the second forwarding plane network element obtains the first service corresponding to the updated first DN connection from the policy decision network element.
  • the policy rule is used to control the policy of the updated first DN connection according to the first service policy rule; or the control plane network element obtains the first service policy rule corresponding to the updated first DN connection from the policy decision network element.
  • the control plane network element sends the first service policy rule to the second forwarding plane network element, and the first service policy rule is used to perform policy control on the updated first DN connected packet.
  • the second forwarding plane network element obtains the first service corresponding to the updated first DN connection.
  • a policy rule for performing policy control on the updated first DN-connected packet according to the first service policy rule that is, the policy enforcement point is located on the forwarding plane network element that is closer to the UE, and when the UE initiates a new DN connection, All the DNs of the UE are connected to the same forwarding plane network element, so that the UE performs multi-DN connection granularity policy control.
  • the control plane network element instructs the second forwarding plane network element to obtain the updated first service policy corresponding to the first DN connection from the policy decision network element.
  • rule When the policy control session exists between the control plane network element and the policy decision network element, the control plane network element obtains the first service policy rule corresponding to the updated first DN connection from the policy decision network element, and the first service policy is adopted. The rule is sent to the second forwarding plane network element.
  • the control plane network element sends a session establishment request message or a redirect response message to the second forwarding plane network element, where the session establishment request message or the redirect response message is used to indicate the second forwarding plane network element
  • the policy decision network element obtains the second service policy rule corresponding to the second DN connection, and performs policy control on the second DN connected message according to the second service policy rule; or the control plane network element obtains the second DN connection from the policy decision network element Corresponding second service policy rule; the control plane network element sends the second service policy rule to the second forwarding plane network element, and the second service policy rule is used to perform policy control on the packet of the second DN connection.
  • the second forwarding plane network element in the process of establishing the second DN connection, is further configured to obtain the second service policy rule corresponding to the second DN connection, so as to connect to the second DN according to the second service policy rule.
  • the message is controlled by the policy.
  • the control plane network element establishes a policy control session with the policy decision network element, and obtains, by using a policy control session, the first service corresponding to the updated first DN connection from the policy decision network element.
  • the policy rule and the second service policy rule corresponding to the second DN connection; or, the control plane network element establishes two policy control sessions with the policy decision network element, and controls the session from the policy decision by using one of the two policy control sessions.
  • the network element obtains the first service policy rule corresponding to the updated first DN connection, and acquires the second service policy rule corresponding to the second DN connection by using another policy control session in the two policy control sessions.
  • the control plane network element obtains the service policy rule corresponding to the multiple connections by using a policy control session with the policy decision network element, which can reduce the signaling overhead caused by the maintenance policy control session and save the channel transmission resource.
  • the control plane network element obtains a service policy rule corresponding to the connection by using a policy control session with the policy decision network element, and can flexibly obtain the service policy rule.
  • the control plane network element sends a first policy control session establishment request message to the policy decision network element, where the first policy control session establishment request message carries the connection identifier of the first DN connection and the second DN connection. And the first service policy rule corresponding to the updated first DN connection and the second service policy rule corresponding to the second DN connection sent by the received policy decision network element according to the first policy control session establishment request message.
  • the service policy rule corresponding to multiple connections is obtained through a policy control session, thereby reducing the message caused by the maintenance policy control session. Make overhead and save channel transmission resources.
  • the control plane network element sends a second policy control session establishment request message to the policy decision network element, where the second policy control session establishment request message carries the connection identifier of the second DN connection; the receiving policy decision network And the second service policy rule corresponding to the second DN connection sent by the session control request message according to the second policy; the policy control session request message is sent to the policy decision network element, where the policy control session request message carries the connection of the first DN connection The first policy policy rule corresponding to the updated first DN connection sent by the receiving policy decision network element according to the policy control session request message.
  • a policy control session establishment request message carries a DN connection first.
  • the connection identifier is received, and then the connection identifier of the other DN connection is carried in the policy control session request message, so that the service policy rule corresponding to the multiple connections is obtained through a policy control session, which can reduce the signaling overhead caused by the maintenance policy control session. Save channel transmission resources.
  • the control plane network element sends a third policy control session establishment request message to the policy decision network element, where the third policy control session establishment request message carries the connection identifier of the first DN connection; the receiving policy decision network Transmitting, by the third policy, a first service policy rule corresponding to the updated first DN connection sent by the session establishment request message, and sending a fourth policy control session establishment request message to the policy decision network element, where the fourth policy controls the session establishment request
  • the message carries the connection identifier of the second DN connection, and the receiving policy decision network element controls the second service policy rule corresponding to the second DN connection sent by the session establishment request message according to the fourth policy.
  • control plane network plane carries the connection identifier of one DN connection in one policy control session establishment request message, and carries the connection identifier of another DN connection in another policy control session establishment request message, thereby implementing control
  • the surface network element obtains a service policy rule corresponding to the connection through a policy control session between the policy decision network element, and can flexibly obtain the service policy rule.
  • the first service policy rule includes the indication identifier or the tunnel information, where the indication identifier or the tunnel information is used to indicate that the second forwarding plane network element receives the downlink packet from the first forwarding plane network element.
  • the flow detection is performed according to the IP quintuple in the tunnel.
  • the first service policy rule is the service policy rule corresponding to the updated first DN connection, and the updated first DN connection passes through the first forwarding plane network element and the second forwarding plane network element
  • the first service plane rule includes the indication identifier or the tunnel information, and indicates that the second forwarding plane network element performs flow detection on the downlink packet received from the first forwarding plane network element according to the IP quintuple in the tunnel, so that the correct pair Downstream messages are used for policy control.
  • the control plane network element sends a session establishment request message to the second forwarding plane network element, where the session establishment request message is used to indicate that the second forwarding plane network element is established between the first forwarding plane network element and the first forwarding plane network element.
  • the session establishment request message is used to indicate that the second forwarding plane network element is established between the first forwarding plane network element and the first forwarding plane network element.
  • a packet forwarding path corresponding to the first DN connection and indicating that the second forwarding plane network element establishes, by the control plane network element, a packet forwarding path corresponding to the first DN connection between the base station serving the UE .
  • the control plane network element sends a session establishment request message to the second forwarding plane network element, and instructs the second forwarding plane network element to update the forwarding path of the first DN connection, so that the updated first The forwarding path of the DN connection passes through the second forwarding plane network element, which makes the UE
  • the DN is connected to the forwarding plane network element that is closer to the UE.
  • the control plane network element sends a first packet forwarding policy to the first forwarding plane network element, and sends a second packet forwarding policy to the second forwarding network element, and sends the second packet forwarding policy to the base station serving the UE.
  • the third packet forwarding policy, the first packet forwarding policy, the second packet forwarding policy, and the third packet forwarding policy are used to establish a first forwarding plane network element and a second forwarding plane network element corresponding to the first DN connection The packet forwarding path between the packet and the packet forwarding path between the second forwarding plane network element and the base station.
  • the control plane network element sends a packet forwarding policy to the first forwarding plane network element, the second forwarding plane network element, and the base station serving the UE, and updates the forwarding path of the first DN connection, so that the forwarding path of the first DN connection is updated.
  • the forwarding path of the updated first DN connection passes through the second forwarding plane network element.
  • the DN connection of the UE passes through the forwarding plane network element that is closer to the UE.
  • the DN is connected to the same forwarding plane network element to control the multi-DN connection granularity of the UE.
  • control plane network element receives the policy control session deletion request message sent by the policy decision network element, and the policy control session deletion request message is used to delete the policy control between the control plane network element and the policy decision network element.
  • the control plane network element sends a service policy rule deletion request message to the first forwarding plane network element according to the received policy control session deletion request message, where the service policy rule deletion request message is used to indicate that the first forwarding plane network element deletes the first DN. Connect the corresponding third business policy rule.
  • the control plane network element obtains the first service policy rule corresponding to the updated first DN connection from the policy decision network element. After that, the policy control session between the control plane network element and the policy decision network element for the first DN connection before the update is also deleted; the control plane network element controls the session deletion request message according to the received policy to the first forwarding network.
  • the meta-transmission service policy rule deletion request message instructs the first forwarding plane network element to delete the third service policy rule corresponding to the first DN connection, so that one DN connection has only one policy enforcement point, and multiple DN connections are implemented through the policy enforcement point.
  • the second aspect provides a policy control method, where the UE has a first DN connection with the first forwarding plane network element as an anchor point, and the second forwarding plane network element updates the forwarding path of the first DN connection, so that the updated The forwarding path of a DN connection passes through the second forwarding plane network element; the second forwarding plane network element is updated.
  • the message of the first DN connection is controlled by the policy.
  • the second forwarding plane network element updates the forwarding path of the first DN connection by using the forwarding path migration, so that the updated forwarding path of the first DN connection passes through the second forwarding plane network element, and the second forwarding plane
  • the network element performs policy control on the packets of the first DN connection to implement policy control for multi-PDN connection granularity of the UE's packets.
  • the second forwarding plane network element receives the session establishment request message or the redirect response message sent by the control plane network element, and obtains the update from the policy decision network element according to the session establishment request message or the redirect response message.
  • the first DN of the first DN is connected to the first service policy rule, and the policy of the first DN connection is updated according to the first service policy rule.
  • the second forwarding plane network element when the policy control session exists between the forwarding plane network element and the policy decision network element, obtains the updated first DN from the policy decision network element according to the indication of the control plane network element.
  • the policy execution point is located on the forwarding plane network element that is closer to the UE, when the UE initiates a new
  • all the DNs of the UE are connected to the same forwarding plane network element, thereby performing policy control on the multi-DN connection granularity of the UE.
  • the second forwarding plane network element receives the first service policy rule corresponding to the updated first DN connection sent by the control plane network element, and the second forwarding plane network element is configured according to the first service policy rule.
  • the updated message of the first DN connection is controlled by the policy.
  • the second forwarding plane network element when the policy control session exists between the control plane network element and the policy decision network element, receives the first service policy rule sent by the control plane network element, and the first service policy rule The second forwarding plane network element performs a policy on the updated first DN connected packet according to the first service policy rule, in order to control the service policy rule corresponding to the updated first DN connection obtained by the plane network element from the policy decision network element.
  • Control that is, the policy enforcement point is located on the forwarding plane network element that is closer to the UE.
  • the UE further has a second DN connection with the second forwarding plane network element as an anchor point, and the second forwarding plane network element receives the session establishment request message or redirect sent by the control plane network element. And responding to the message, the second service policy rule corresponding to the second DN connection is obtained from the policy decision network element according to the session establishment request message or the redirect response message, and the policy of the second DN connected message is controlled according to the second service policy rule.
  • the second forwarding plane network element obtains the second service policy rule corresponding to the second DN connection from the policy decision network element according to the indication of the control plane network element, so as to connect the packet of the second DN according to the second service policy rule. Conduct policy control.
  • the second forwarding plane network element receives the second service policy rule corresponding to the second DN connection sent by the control plane network element, and the second forwarding plane network element performs the second DN according to the second service policy rule.
  • the connected packets are controlled by policies.
  • the second forwarding plane network element receives the second service policy rule corresponding to the second DN connection sent by the control plane network element,
  • the second service policy rule is that the control plane network element obtains the second service policy rule corresponding to the second DN connection from the policy decision network element, so as to perform policy control on the second DN connected message according to the second service policy rule.
  • the second forwarding plane network element establishes a policy control session with the policy decision network element, and obtains, by using a policy control session, the updated first DN connection from the policy decision network element.
  • a business policy rule and a second business policy rule corresponding to the second DN connection are established.
  • the forwarding plane network element obtains the service policy rule corresponding to the multiple connections by using a policy control session between the policy decision network element, and the signaling overhead caused by the maintenance policy control session is reduced, and the channel transmission resource is saved.
  • the second forwarding plane network element establishes two policy control sessions with the policy decision network element, and the one of the two policy control sessions obtains the updated information from the policy decision network element.
  • the first DN connects the corresponding first service policy rule, and obtains the second service policy rule corresponding to the second DN connection by using another policy control session in the two policy control sessions.
  • the forwarding plane network element obtains a service policy rule corresponding to the connection by using a policy control session with the policy decision network element, and can flexibly obtain the service policy rule corresponding to the multiple connections.
  • the second forwarding plane network element sends a first policy control session establishment request message to the policy decision network element, where the first policy control session establishment request message carries the connection identifier of the first DN connection and the second a connection identifier of the DN connection; the first service policy rule corresponding to the updated first DN connection and the second service policy rule corresponding to the second DN connection sent by the receiving policy decision network element according to the first policy control session establishment request message .
  • the service policy rule corresponding to multiple connections is obtained through a policy control session, thereby reducing the message caused by the maintenance policy control session. Make overhead and save channel transmission resources.
  • the second forwarding plane network element sends a second policy control session establishment request message to the policy decision network element, where the second policy control session establishment request message carries the connection identifier of the second DN connection;
  • the decision network element controls the second service policy rule corresponding to the second DN connection sent by the session establishment request message according to the second policy; and sends a policy control session request message to the policy decision network element, where the policy control session request message carries the first DN connection
  • the connection identifier is determined by the receiving policy decision network element according to the policy control session request message and the first service policy rule corresponding to the updated first DN connection.
  • connection control identifier of the DN connection is carried in the policy control session establishment request message, and then the connection identifier of another DN connection is carried in the policy control session request message, so that multiple connections are obtained through one policy control session.
  • Corresponding service policy rules can reduce the signaling overhead caused by the maintenance policy control session and save channel transmission resources.
  • the second forwarding plane network element sends a third policy control session establishment request message to the policy decision network element, where the third policy control session establishment request message carries the connection identifier of the first DN connection;
  • the decision network element controls the first service policy rule corresponding to the updated first DN connection sent by the session establishment request message according to the third policy; sends a fourth policy control session establishment request message to the policy decision network element, and the fourth policy control session
  • the connection request message carries the connection identifier of the second DN connection
  • the receiving policy decision network element controls the second service policy rule corresponding to the second DN connection sent by the session establishment request message according to the fourth policy.
  • the forwarding plane network carries a connection identifier of a DN connection in a policy control session establishment request message, and carries a connection identifier of another DN connection in another policy control session establishment request message, thereby implementing forwarding.
  • the network element obtains a service policy rule corresponding to the connection through a policy control session between the network and the policy decision network element, and can flexibly obtain the service policy rule corresponding to multiple connections.
  • the second forwarding plane network element receives the session establishment request message sent by the control plane network element, and establishes, according to the session establishment request message, the first DN connection corresponding to the first forwarding plane network element.
  • a packet forwarding path, and a packet forwarding path corresponding to the first DN connection between the base station and the base station serving the UE is established by the control plane network element.
  • the forwarding plane network element updates the first DN connection according to the indication of the control plane network element.
  • the corresponding packet forwarding path is implemented to implement the forwarding path migration.
  • the DN connection of the UE passes through the forwarding plane network element that is closer to the UE.
  • all the DN connections of the UE are the same. Forwarding the face network element, thereby performing policy control on the multi-DN connection granularity of the UE.
  • the second forwarding plane network element receives the second packet forwarding policy sent by the control plane network element, so that the second forwarding plane network element is configured according to the second packet forwarding policy and the first forwarding plane network.
  • the packet forwarding path between the first forwarding plane network element and the second forwarding plane network element corresponding to the first DN connection is established according to the first packet forwarding policy received from the control plane network element; the second forwarding plane network And the base station serving the UE according to the second packet forwarding policy, according to the third packet forwarding policy received from the control plane network element, establishing a report between the second forwarding plane network element corresponding to the first DN connection and the base station Text forwarding path.
  • the forwarding plane network element updates the packet forwarding path corresponding to the first DN connection according to the packet forwarding policy sent by the control plane network element, so as to implement the forwarding path migration, in this manner, the DN connection of the UE passes the distance UE.
  • the UE initiates a new DN connection, all the DNs of the UE are connected to the same forwarding plane network element, thereby performing multi-DN connection granularity policy control on the UE.
  • the first forwarding plane network element receives the policy decision network element and sends the The policy control session deletion request message is used to delete the policy control session between the first forwarding plane network element and the policy decision network element, and the first forwarding plane network element deletes the first according to the policy control session deletion request message.
  • the third service policy rule corresponding to the DN connection is used to delete the policy control session between the first forwarding plane network element and the policy decision network element, and the first forwarding plane network element deletes the first according to the policy control session deletion request message.
  • the second forwarding plane network element when the policy control session exists between the forwarding plane network element and the policy decision network element, the second forwarding plane network element obtains the updated first service policy corresponding to the first DN connection from the policy decision network element. After the rule, the first forwarding plane network element deletes the policy control session corresponding to the first DN connection before the update and the service policy rule corresponding to the first DN connection before the update according to the instruction of the policy decision network element.
  • the first forwarding plane network element receives the control plane network element and sends the The service policy rule deletion request message is used to indicate that the first forwarding plane network element deletes the third service policy rule corresponding to the first DN connection, and the first forwarding plane network element deletes the request message according to the service policy rule deletion request message.
  • a third service policy rule corresponding to a DN connection is used to indicate that the first forwarding plane network element deletes the third service policy rule corresponding to the first DN connection, and the first forwarding plane network element deletes the request message according to the service policy rule deletion request message.
  • the second forwarding plane network element when the policy control session exists between the control plane network element and the policy decision network element, the second forwarding plane network element obtains the updated first service policy corresponding to the first DN connection from the policy decision network element. After the rule, the first forwarding plane network element deletes the service policy rule corresponding to the first DN connection before the update according to the indication of the control plane network element.
  • a third aspect provides a policy control method, where the UE has a first data network DN connected with a first forwarding plane network element as an anchor point, and the policy decision network element receives the control plane network element or the second forwarding plane network element.
  • the first policy control session establishment request message where the first policy control session establishment request message carries the connection identifier of the first DN connection; the policy decision network element controls the session establishment request message according to the first policy to the second forwarding plane network element or the control plane.
  • the network element sends a first service policy rule corresponding to the first DN connection, where the first service policy rule is used to perform policy control on the message connected by the first DN.
  • the policy decision network element sends the first service policy rule corresponding to the updated first DN connection to the second forwarding plane network element or the control plane network element, so that the second forwarding plane network element is based on the first service policy.
  • the rule controls the policy of the updated first DN connection.
  • the first policy control session establishment request message further carries a connection identifier of the second DN connection, and the second DN connection uses the second forwarding plane network element as an anchor point; the policy decision network element is according to the first
  • the policy control session establishment request message sends a second service policy rule corresponding to the second DN connection to the second forwarding plane network element or the control plane network element, where the second service policy rule is used to perform policy control on the second DN connected packet.
  • the policy decision network element obtains the service policy rule corresponding to the multiple connections by using a policy control session between the control plane network element or the forwarding plane network element, which can reduce the signaling overhead caused by the maintenance policy control session. Save channel transmission resources.
  • the policy decision network element receives the policy control session request message sent by the second forwarding plane network element or the control plane network element, where the policy control session request message carries the second DN connection identifier;
  • the request message sends a second service policy team corresponding to the second DN connection to the second forwarding plane network element or the control plane network element, and the second service policy rule is used to perform policy control on the second DN connected packet.
  • connection control identifier of the DN connection is carried in the policy control session establishment request message, and then the connection identifier of another DN connection is carried in the policy control session request message, so that multiple connections are obtained through one policy control session.
  • Corresponding service policy rules can reduce the signaling overhead caused by the maintenance policy control session and save channel transmission resources.
  • the policy decision network element receives the second forwarding plane network element or controls The second policy control session establishment request message sent by the surface network element, the second policy control session establishment request message carrying the connection identifier of the second DN connection; controlling the session establishment request message to the second forwarding plane network element or controlling according to the second policy
  • the network element sends a second service policy rule corresponding to the second DN connection, and the second service policy rule is used to perform policy control on the second DN connected message.
  • a policy control session establishment request message carries a connection identifier of a DN connection
  • another policy control session establishment request message carries a connection identifier of another DN connection, thereby implementing a policy decision network element.
  • a policy control session between the control plane network element and the forwarding plane network element obtains a service policy rule corresponding to the connection, and can flexibly obtain the service policy rule corresponding to multiple connections.
  • the policy decision network element sends the first service policy rule corresponding to the first DN connection to the second forwarding plane network element or the control plane network element according to the first policy control session establishment request message.
  • the policy decision network element sends a policy control session deletion request message to the first forwarding plane network element or the control plane network element, where the policy control session deletion request message is used to delete the policy control between the first forwarding plane network element and the policy decision network element. Session or delete a policy control session between the control plane network element and the policy decision network element.
  • the policy decision network element sends a policy control session deletion request message to the first forwarding plane network element or the control plane network element, where the policy control session deletion request message is used to delete the first forwarding plane network element and the policy decision network element.
  • the policy control session between the control plane or the policy control session between the control plane network element and the policy decision network element, and the third forwarding plane network element is instructed to delete the third service policy rule corresponding to the first DN connection, thereby making a DN connection
  • the embodiment of the present invention provides a control plane network element, where the control plane network element can implement the functions performed by the control plane network element in the foregoing method example, where the function can be implemented by hardware or by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • control plane network element includes a processor and a communication interface configured to support the control plane network element to perform a corresponding function in the above method.
  • the communication interface is used to support communication between the control plane network element and other network elements.
  • the control plane network element can also include a memory for coupling with the processor to store program instructions and data necessary for the control plane network element.
  • an embodiment of the present invention provides a forwarding plane network element, where the forwarding plane network element can be implemented.
  • the function performed by the forwarding plane network element in the foregoing method embodiment may be implemented by using hardware or by executing corresponding software through hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the structure of the forwarding plane network element includes a processor and a communication interface, and the processor is configured to support the forwarding plane network element to perform a corresponding function in the foregoing method.
  • the communication interface is used to support communication between the forwarding plane network element and other network elements.
  • the forwarding plane network element can also include a memory for coupling with the processor to store program instructions and data necessary for the forwarding plane network element.
  • the embodiment of the present invention provides a policy decision network element, where the policy decision network element can implement the function performed by the policy decision network element in the foregoing method embodiment, where the function can be implemented by hardware or by hardware. Perform the appropriate software implementation.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the structure of the policy decision network element includes a processor and a communication interface, the processor being configured to support the policy decision network element to perform a corresponding function in the above method.
  • the communication interface is used to support communication between the policy decision network element and other network elements.
  • the policy decision network element can also include a memory for coupling with the processor that holds the program instructions and data necessary for the policy decision network element.
  • an embodiment of the present invention provides a policy control system, where the system includes the control plane network element, the forwarding plane network element, and the policy decision network element.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the control plane network element, including a program designed to perform the above aspects.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the forwarding plane network element, including a program designed to perform the above aspects.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the policy decision network element, including a program designed to perform the above aspects.
  • the solution provided by the embodiment of the present invention specifically provides a policy control method in a multi-connection scenario, in which, when the user moves the handover process, it is determined that the new forwarding plane network element serves the UE.
  • the control plane network element controls the session migration through the policy, so that the user packet passes the latest forwarding plane network element, and the user packet is controlled by the forwarding plane network element; or in the process of establishing the PDN connection, the policy is controlled.
  • Migration of sessions and/or forwarding paths to make all PDN connections The user packet passes through the same forwarding plane network element and performs policy control through the forwarding plane network element.
  • FIG. 1 is a schematic diagram of a system architecture of an EPC system
  • FIG. 2 is a schematic diagram of a path after a UE moves in the system architecture shown in FIG. 1;
  • 2a is a schematic diagram of multiple PDN connections after a UE moves
  • FIG. 3 is a schematic diagram of a possible system architecture for implementing the present invention.
  • FIG. 4 is a schematic diagram of another possible system architecture for implementing the present invention.
  • FIG. 5 is a schematic diagram of an application scenario according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of another application scenario according to an embodiment of the present disclosure.
  • FIG. 7 is a signal flow diagram of a policy control method according to Embodiment 1 of the present invention.
  • Embodiment 8 is a signal flow diagram of a policy control method according to Embodiment 2 of the present invention.
  • Embodiment 9 is a signal flow diagram of a policy control method according to Embodiment 3 of the present invention.
  • FIG. 10 is a signal flow diagram of a policy control method according to Embodiment 4 of the present invention.
  • FIG. 11 is a signal flow diagram of a policy control method according to Embodiment 5 of the present invention.
  • FIG. 12 is a signal flow diagram of a policy control method according to Embodiment 6 of the present invention.
  • FIG. 13 is a signal flow diagram of a policy control method according to Embodiment 7 of the present invention.
  • FIG. 14 is a signal flow diagram of a policy control method according to Embodiment 8 of the present invention.
  • FIG. 15 is a structural diagram of a control plane network element according to an embodiment of the present invention.
  • FIG. 16 is a structural diagram of a forwarding plane network element according to an embodiment of the present disclosure.
  • FIG. 17 is a structural diagram of a policy decision network element according to an embodiment of the present invention.
  • FIG. 18 is a structural diagram of another control plane network element according to an embodiment of the present invention.
  • FIG. 19 is a structural diagram of another forwarding plane network element according to an embodiment of the present invention.
  • FIG. 20 is a structural diagram of another policy decision network element according to an embodiment of the present invention.
  • FIG. 21 is a structural diagram of a policy control system according to an embodiment of the present invention.
  • the network architecture and the service scenario described in the embodiments of the present invention are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present invention, and are not limited to the technical solutions provided by the embodiments of the present invention.
  • the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.
  • the system mainly includes the following network elements: a UE, an access network (AN), a control plane network element, a forwarding plane network element, and a policy decision network element.
  • the UE refers to a network terminal device, including but not limited to a mobile phone, a network access terminal device, an Internet of Things terminal device, and the like.
  • AN refers to devices that provide wireless access to terminal devices, including but not limited to evolved base stations (eNodeBs), wireless fidelity (Fireless-Fidelity, WiFi) access points (APs), and fifth-generation mobile communication technologies.
  • the control plane network element refers to a network element responsible for mobility management and/or forwarding path management in a mobile network, such as a Mobility Management Entity (MME), a Gateway Controller (GW-C), and a software-defined network. (Software Define Network, SDN) controller or a mobile gateway controller formed by combining all or part of the functions of the network element.
  • the forwarding plane network element is a network element that forwards service packets to the user.
  • the policy decision network element is responsible for policy control and/or charging control of the mobile network, and may be a PCRF in the EPC network.
  • the policy control session is located between the forwarding plane network element and the policy decision network element.
  • FIG. 4 is a schematic diagram of another possible system architecture for implementing the present invention.
  • the difference between the system architecture shown in FIG. 4 and the system architecture shown in FIG. 3 is that the policy control session in the system architecture diagram shown in FIG. 3 is located between the forwarding plane network element and the policy decision network element; the system shown in FIG.
  • the policy control session in the architecture diagram is located between the control plane network element and the policy decision network element.
  • a DN Data Network
  • the UE establishes a session connection with the DN network, which is called a DN connection.
  • the DN connection may be a PDN (Packet Data Network) connection.
  • the policy control session refers to a signaling connection between a control plane network element or a forwarding plane network element and a policy decision network element, and is used to control a plane network element or a forwarding plane network element to determine a DN. Connect the corresponding business policy rules.
  • FIG. 5 is a schematic diagram of an application scenario according to an embodiment of the present disclosure, where the scenario is based on the system architecture shown in FIG. 3.
  • a communication connection may be established between the control plane network element and the BS and the forwarding plane network element, and a policy control session may be established between the policy decision network element and the forwarding plane network element. Only the communication connection between the control plane network element and BS1, and the communication connection between the control plane network element and the forwarding plane network element 1, and the policy between the policy decision network element and the forwarding plane network element 1 are shown in FIG. Control the session.
  • FIG. 6 is a schematic diagram of another application scenario according to an embodiment of the present disclosure, where the scenario is based on the system architecture shown in FIG. 4.
  • the communication between the control plane network element and the BS and the forwarding plane network element may be established, and a policy control session may be established between the policy decision network element and the control plane network element.
  • Only the communication connection between the control plane network element and BS1 and the communication connection between the control plane network element and the forwarding plane network element 1 are shown in FIG. Referring to FIGS. 5 and 6, the UE performs a handover during a move. For example, when the UE moves in the direction of the arrow in the figure, it switches from BS1 to BS2, and accesses the DN through DN connection 1 or DN connection 2.
  • the UE may also establish a new DN connection with the DN to implement optimization of the UE's new service route. For example, when the UE is located at BS2, a new DN connection establishment procedure is initiated, and the DN is accessed through the DN connection 3.
  • the DN connection 1 uses the forwarding plane network element 1 as an anchor point; the DN connection 2 uses the forwarding plane network element 1 as an anchor point, and the forwarding path passes through the forwarding plane network element 2 and the forwarding plane network element. 1; DN connection 3 uses forwarding plane network element 2 as an anchor point.
  • the basic idea of the present invention is that, in the process of user mobile handover, when the new forwarding plane network element is determined to serve the UE, the control plane network element controls the session migration through the policy, so that the user packet passes the new forwarding plane network element.
  • the policy of the user is controlled by the network element of the forwarding plane.
  • the policy is used to control the migration of the session and/or the forwarding path, so that the user packets on all DN connections are forwarded the same. Face network elements, and policy control of user packets through the forwarding plane network element.
  • the policy control session refers to a signaling connection between the control plane network element or the forwarding plane network element and the policy decision network element, and is used to control the plane network element or the forwarding plane network element to determine the service policy rule corresponding to the DN connection.
  • the forwarding path migration refers to updating the forwarding path of the UE, so that all the DN connections of the UE pass through the same forwarding plane network element, and the multi-DN connection granularity policy control is performed on the user packet through the forwarding plane network element. For example, as shown in FIG. 5a, after the UE moves, the DN is connected. The DN network is connected to the DN network, and the new DN connection of the UE is connected to the DN network through the DN connection 3.
  • the UE has two policy enforcement points, that is, the forwarding plane network element 1 controls the user packets on the DN connection 1.
  • the forwarding plane network element 2 performs policy control on the user packet on the DN connection 2, and the DN connection 1 does not go through the forwarding plane network element 2, and the forwarding path between the BS2 and the forwarding plane network element 1 is performed through the forwarding path migration.
  • the migration is performed between the BS2 and the forwarding plane network element 2, and between the forwarding plane network element 2 and the forwarding plane network element 1.
  • FIG. 7 is a signal flow diagram of a policy control method according to an embodiment of the present invention.
  • the method mainly includes: a UE, a BS, a control plane network element, a first forwarding plane network element, and a second forwarding plane network element.
  • Policy decision network element The control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE, and when the control plane network element receives the handover notification message of the UE, determining that the second forwarding plane network element serves the UE Update the forwarding path and perform policy control session migration.
  • This embodiment is directed to the system architecture shown in FIG. 4 and the application scenario shown in FIG. 6, that is, the policy control session is located between the control plane network element and the policy decision network element.
  • the BS (source BS) that is accessed before the UE moves in FIG. 7 is the BS1 in FIG. 6
  • the BS (target BS) that is accessed after the UE moves is the BS 2 in FIG. 6
  • the first forwarding plane network element is FIG. 6
  • the forwarding plane network element 1 and the second forwarding plane network element are the forwarding plane network element 2 in FIG.
  • the specific scenario is described as follows: when the UE is located under the coverage of the source BS, the control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE; when the UE moves to the target BS, the update is performed.
  • the forwarding path of a DN connection is such that it accesses the DN through the DN connection 2 shown in FIG.
  • the policy triggered by the scenario controls the migration process of the session.
  • the method includes:
  • step 400 the UE moves and switches from the source BS to the target BS.
  • Step 401 The control plane network element receives the handover notification message of the target BS.
  • Step 402 The control plane network element determines that the second forwarding plane network element serves the UE.
  • Step 403 The control plane network element updates the forwarding path of the first DN connection, so that the forwarding path of the first DN connection passes through the second forwarding plane network element.
  • the step 403 may include: the control plane network element sends a first packet forwarding policy to the first forwarding plane network element, and sends a second packet forwarding policy to the second forwarding network element to provide services for the UE.
  • the base station sends a third packet forwarding policy, where the first packet forwarding policy, the second packet forwarding policy, and the third packet forwarding policy are used to establish a location corresponding to the first DN connection. a packet forwarding path between the first forwarding plane network element and the second forwarding plane network element, and a packet forwarding path between the second forwarding plane network element and the base station.
  • the method further includes a process of the second forwarding plane network element determining the first service policy rule corresponding to the first DN connection.
  • the first service policy rule includes an indication identifier or tunnel information, where the indication identifier or the tunnel information is used to indicate that the second forwarding plane network element follows the intra-tunnel network protocol IP for the downlink packet received from the first forwarding plane network element.
  • the quintuple performs flow detection.
  • the process of determining, by the second forwarding plane network element, the first service policy rule corresponding to the first DN connection may be implemented by the following steps 404 to 406:
  • Step 404 The control plane network element sends a first policy control session establishment request message to the policy decision network element, where the first policy control session establishment request message carries the connection identifier of the first DN connection.
  • the first policy control session establishment request message may further include an identifier of the second forwarding plane network element, where the policy decision network element determines that the policy enforcement point of the first DN connection is located in the second forwarding plane network element.
  • Step 405 The policy decision network element controls the session establishment request message according to the first policy, determines a first service policy rule corresponding to the first DN connection, and sends a first policy control session establishment response message to the control plane network element, carrying the first A business policy rule.
  • the first service policy rule is used to instruct the second forwarding plane network element to perform policy control on the first DN connected packet according to the first service policy rule.
  • Step 406 The control plane network element sends the first service policy rule to the second forwarding plane network element.
  • the first service policy rule is used to instruct the second forwarding plane network element to perform policy control on the packet of the first DN connection.
  • step 403 there is no strict sequence of execution between step 403 and steps 404-405.
  • step 404-405 occurs before the step 403
  • the control plane network element that sends the first service policy rule to the second forwarding plane network element may be merged with the step 403.
  • the control plane network element is directed to When the second forwarding plane network element sends the second packet forwarding policy, the first forwarding policy carries the first service policy rule.
  • the second DN connection with the second forwarding plane network element as an anchor point may be established (corresponding to the DN connection 3 in FIG. 6), and the control plane network is convenient for description.
  • the signaling connection corresponding to the first DN connection after the forwarding path is updated is referred to as a first policy control session, and the first policy control session is used to determine and The business policy rule corresponding to the first DN connection after the forwarding path is updated, the industry The service policy rule is called the first service policy rule; in the multiple policy control sessions between the control plane network element and the policy decision network element, the signaling connection corresponding to the second DN connection is called the second policy control session.
  • the second policy control session is configured to determine a service policy rule corresponding to the second DN connection, where the service policy rule is referred to as a second service policy rule; and multiple policy control sessions between the control plane network element and the policy decision network element.
  • the signaling connection corresponding to the first DN connection before the forwarding path update is referred to as a third policy control session, and the third policy control session is used to determine a service corresponding to the first DN connection before the forwarding path update Policy rule, which is called the third business policy rule.
  • the embodiment of the present invention further includes the process of deleting the third service policy rule corresponding to the first DN connection by the first forwarding plane network element, which may be implemented by the following steps 407 and 408:
  • Step 407 The policy decision network element sends a policy control session deletion request message to the control plane network element, where the policy control session deletion request message is used to delete the third policy control session between the control plane network element and the policy decision network element.
  • Step 408 The control plane network element sends a service policy rule deletion request to the first forwarding plane network element, and instructs the first forwarding plane network element to delete the third service policy rule corresponding to the first DN connection.
  • the first forwarding plane network element sends a service policy rule deletion response message to the control plane network element.
  • Step 409 The control plane network element sends a policy control session deletion response message to the policy decision network element.
  • step 407 can occur at any step after step 404.
  • FIG. 8 is a signal flow diagram of another policy control method according to an embodiment of the present invention.
  • the method mainly includes: a UE, a BS, a control plane network element, a first forwarding plane network element, and a second forwarding plane network element. And policy decision network elements.
  • the control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE, and when the control plane network element establishes a second DN connection with the second forwarding plane network element as an anchor point for the UE , the policy control session and the migration path migration.
  • This embodiment is directed to the system architecture shown in FIG. 4 and the application scenario shown in FIG. 6, that is, the policy control session is located between the control plane network element and the policy decision network element.
  • the source BS in FIG. 8 is BS1 in FIG. 6, and the target BS is BS2 in FIG. 6.
  • the first forwarding plane network element is the forwarding plane network element 1 in FIG. 6, and the second forwarding plane network element is in FIG. Forwarding plane network element 2.
  • the specific scenario is described as follows: when the UE is located in the source BS, the control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE; when the UE moves to the target BS, the first DN is updated. The forwarding path of the connection is made to be accessed through the DN connection 1 or the DN connection 2 shown in FIG. DN.
  • the policy triggered by the scenario controls the migration process of the session and/or the migration process of the forwarding path (when the UE moves to the target BS and accesses the DN through the DN connection 1 shown in FIG. 6 , the migration process involving the forwarding path is involved.
  • the specific process refers to FIG. 8, and the method includes:
  • Step 411 The UE initiates a second DN connection establishment process, and sends a DN connection establishment request to the control plane network element by using the BS.
  • Step 412 The control plane network element determines that the second forwarding plane network element serves the UE.
  • Step 413 The control plane network element updates the forwarding path of the first DN connection, so that the forwarding path of the first DN connection passes through the second forwarding plane network element.
  • control plane network element can also establish a forwarding path of the second DN connection.
  • the step 413 may include: the control plane network element sends a first packet forwarding policy to the first forwarding plane network element, and sends a second packet forwarding policy to the second forwarding network element to provide services for the UE.
  • the base station sends a third packet forwarding policy, where the first packet forwarding policy, the second packet forwarding policy, and the third packet forwarding policy are used to establish the first packet corresponding to the first DN connection.
  • control plane network element may further send a fourth packet forwarding policy to the second forwarding plane network element, and send a fifth packet forwarding policy to the base station serving the UE, and establish the corresponding to the second DN connection. a packet forwarding path between the base station and the second forwarding plane network element.
  • the method further includes a process of the second forwarding plane network element determining the first service policy rule corresponding to the first DN connection and the second service policy rule corresponding to the second DN connection.
  • the first service policy rule includes an indication identifier or tunnel information, where the indication identifier or the tunnel information is used to indicate that the second forwarding plane network element follows the intra-tunnel network protocol IP for the downlink packet received from the first forwarding plane network element.
  • the quintuple performs flow detection.
  • the process can be implemented by the following steps 414 to 418:
  • the signaling connection corresponding to the first DN connection after the forwarding path is updated is referred to as a first policy control session.
  • the first policy control session is used to determine a service policy rule corresponding to the first DN connection after the forwarding path is updated, and the service policy rule is called a first service policy rule;
  • the control plane network element and the policy decision network element are In a plurality of policy control sessions, the signaling connection corresponding to the second DN connection is referred to as a second policy control session, and the second policy control session is used to determine a service policy rule corresponding to the second DN connection,
  • the business policy rule is called the second business policy rule; the plurality of policy control sessions between the control plane network element and the policy decision network element, and the first before the forwarding path update
  • the signaling connection corresponding to a DN connection is referred to as a third policy control session, and the third policy control session is used to determine a service policy rule corresponding to the first
  • Step 414 The control plane network element sends a first policy control session establishment request message to the policy decision network element, where the first policy control session establishment request message carries the connection identifier of the first DN connection.
  • the first policy control session establishment request message may further include an identifier of the second forwarding plane network element, where the policy decision network element determines that the policy enforcement point of the first DN connection is located in the second forwarding plane network element.
  • Step 415 The policy decision network element controls the session establishment request message according to the first policy, determines a first service policy rule corresponding to the first DN connection, and sends a first policy control session establishment response message to the control plane network element, carrying the first A business policy rule.
  • the first service policy rule is used to instruct the second forwarding plane network element to perform policy control on the first DN connected packet according to the first service policy rule.
  • Step 416 The control plane network element sends a second policy control session establishment request message to the policy decision network element, where the second policy control session establishment request message carries the connection identifier of the second DN connection.
  • Step 417 The policy decision network element controls the session establishment request message according to the first policy, determines a second service policy rule corresponding to the second DN connection, and sends a second policy control session establishment response message to the control plane network element, carrying the Two business strategy rules.
  • the second service policy rule is configured to instruct the second forwarding plane network element to perform policy control on the second DN connected packet according to the second service policy rule.
  • Step 418 The control plane network element sends the first service policy rule and the second service policy rule to the second forwarding plane network element.
  • step 414-417 occurs before the step 413, the control plane network element of the step 418 sends the first service policy rule and the second service policy rule to the second forwarding plane network element, which may be merged with step 413, that is, in step 413.
  • the control plane network element sends the second packet forwarding policy to the second forwarding plane network element, the first service policy rule is also carried, and when the fourth packet forwarding policy is sent to the second forwarding plane network element, the first packet forwarding policy is further carried.
  • Two business strategy rules Two business strategy rules.
  • the embodiment of the present invention further includes the process of deleting the third service policy rule corresponding to the first DN connection by the first forwarding plane network element, which may be implemented by the following steps 419 to 421:
  • Step 419 The policy decision network element sends a policy control session deletion request message to the control plane network element, where the policy control session deletion request message is used to delete the third policy control session between the control plane network element and the policy decision network element.
  • Step 420 The control plane network element sends a service policy rule deletion request to the first forwarding plane network element, and instructs the first forwarding plane network element to delete the third service policy rule corresponding to the first DN connection.
  • the first forwarding plane network element sends a service policy rule deletion response message to the control plane network element.
  • Step 421 The control plane network element sends a policy control session deletion response message to the policy decision network element.
  • step 419 can occur at any step after step 414.
  • Step 422 The control plane network element sends a DN connection setup response to the UE through the BS.
  • the control plane network element obtains, from the policy decision network element, a first service policy rule corresponding to the first DN connection after the forwarding path update and a second service policy rule corresponding to the second DN connection.
  • the method includes the following steps: the control plane network element establishes a policy control session with the policy decision network element, and the control session obtains the first service policy rule corresponding to the first DN connection from the policy decision network element, and passes the policy.
  • the control session acquires the second service policy rule corresponding to the second DN connection; or the control plane network element establishes two policy control sessions between the control policy network element and the policy decision network element through one of the policy control sessions.
  • the DN connects the corresponding first service policy rule, and obtains the second service policy rule corresponding to the second DN connection by using another policy control session.
  • FIG. 8 describes the second mode, that is, two policy control sessions are established between the control plane network element and the policy decision network element, and the first corresponding to the first DN connection is obtained through one of the policy control sessions.
  • the service policy rule obtains the second service policy rule corresponding to the second DN connection by using another policy control session.
  • steps 414-417 in the signal flow diagram described in FIG. 8 may be replaced with the following process: control plane
  • the network element sends a policy control session establishment request to the policy decision network element, and carries the first DN connection identifier and the second DN connection identifier.
  • the policy decision network element controls the session establishment request according to the received policy, determines the first service policy rule corresponding to the first DN connection, and the second service policy rule corresponding to the second DN connection, and sends a policy control session establishment to the control plane network element.
  • the response message carries the first service policy rule and the second service policy rule.
  • control plane network element sends a policy control session establishment request to the policy decision network element, and carries the second DN connection identifier.
  • the policy decision network element determines a second service policy rule corresponding to the second DN connection, And sending a policy control session establishment response message to the control plane network element, and carrying the second service policy rule.
  • the control plane network element sends a policy control session request message to the policy decision network element, and carries the first DN connection identifier.
  • the policy decision network element determines the first service policy rule corresponding to the first DN connection, and sends a policy control session response message to the control plane network element, carrying the first service policy rule.
  • control plane network element sends a policy control session establishment request to the policy decision network element, and carries the second DN connection identifier.
  • the policy decision network element determines a first service policy rule corresponding to the first DN connection, and sends a policy control session establishment response message to the control plane network element, carrying the first service policy rule.
  • the control plane network element sends a policy control session request message to the policy decision network element, and carries the second DN connection identifier.
  • the policy decision network element determines a second service policy rule corresponding to the second DN connection, and sends a policy control session response message to the control plane network element, carrying the second service policy rule.
  • FIG. 9 is a signal flow diagram of another policy control method according to an embodiment of the present invention.
  • the method mainly includes: a UE, a BS, a control plane network element, a first forwarding plane network element, and a second forwarding plane network element. And policy decision network elements.
  • the control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE, and when the control plane network element receives the handover notification message of the UE, determining that the second forwarding plane network element serves the UE Update the forwarding path and perform policy control session migration.
  • This embodiment is directed to the system architecture shown in FIG. 3 and the application scenario shown in FIG. 5, where the policy control session is located between the forwarding plane network element and the policy decision network element.
  • the source BS in FIG. 9 is the BS1 in FIG. 5, the target BS is the BS2 in FIG. 5, the first forwarding plane network element is the forwarding plane network element 1 in FIG. 5, and the second forwarding plane network element is in FIG. Forwarding plane network element 2.
  • the specific scenario is described as follows: when the UE is located in the source BS, the control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE; when the UE moves to the target BS, the first DN is updated. The forwarding path of the connection is such that it accesses the DN through the DN connection 2 shown in FIG.
  • the policy triggered by the scenario controls the migration process of the session.
  • the method includes:
  • step 420 the UE moves and switches from the source BS to the target BS.
  • Step 421 The control plane network element receives the handover notification message of the target BS.
  • Step 422 The control plane network element determines that the second forwarding plane network element serves the UE.
  • Step 423 The control plane network element updates the forwarding path of the first DN connection, so that the forwarding path of the first DN connection passes through the second forwarding plane network element.
  • the step 423 may include: the control plane network element sends a session establishment request message to the second forwarding plane network element, where the session establishment request message is used to indicate that the second forwarding plane network element is established with the first forwarding plane network element. a packet forwarding path corresponding to the first DN connection, and indicating that the second forwarding plane network element establishes, by the control plane network element, a packet corresponding to the first DN connection between the base station serving the UE Forward path.
  • the method further includes a process of the second forwarding plane network element determining the first service policy rule corresponding to the first DN connection.
  • the first service policy rule includes the indication identifier or the tunnel information, where the indication identifier or the tunnel information is used to indicate that the second forwarding plane network element follows the IP of the tunnel in the tunnel for the downlink packet received from the first forwarding plane network element.
  • the group performs flow detection.
  • the process of determining, by the second forwarding plane network element, the first service policy rule corresponding to the first DN connection may be implemented by the following steps 424 and 425:
  • Step 424 The control plane network element sends a session establishment request message or a redirect response message to the second forwarding plane network element.
  • the session establishment request message sent by the control plane network element to the second forwarding plane network element in step 423 and step 424 may be the same session establishment request message.
  • the UE may also establish a second DN connection with the second forwarding plane network element as an anchor point.
  • a first policy control session the signaling connection corresponding to the first DN connection is referred to as a first policy control session, and the first policy control session is used to determine a service policy rule corresponding to the first DN connection, where the service policy rule is called a service policy rule; in a plurality of policy control sessions between the second forwarding plane network element and the policy decision network element, the signaling connection corresponding to the second DN connection is referred to as a second policy control session, and the second policy is The control session is used to determine a service policy rule corresponding to the second DN connection, where the service policy rule is referred to as a second service policy rule; and a plurality of policy control sessions between the second forwarding plane network element and the policy decision network element are The signaling connection corresponding to the first DN connection is referred to as a first policy control session, and the first policy control session is used to determine a service policy rule corresponding to the first
  • Step 425 The second forwarding plane network element obtains the first service policy rule corresponding to the first DN connection from the policy decision network element according to the session establishment request message or the redirect response message.
  • the specific process is: a first policy control session is established between the second forwarding plane network element and the policy decision network element, and the second forwarding plane network element obtains the first service policy rule corresponding to the first DN connection by using the first policy control session.
  • the embodiment of the present invention further includes the process of deleting the third service policy rule corresponding to the first DN connection by the first forwarding plane network element, which may be implemented by the following steps 426 and 427:
  • Step 426 The policy decision network element sends a policy control session deletion request message to the first forwarding plane network element, where the policy control session deletion request message is used to delete the third policy control session between the first forwarding plane network element and the policy decision network element.
  • Step 427 The first forwarding plane network element deletes the service policy rule related to the third policy control session, and sends a policy control session deletion response message to the policy decision network element.
  • the method mainly includes: a UE, a BS, a control plane network element, a first forwarding plane network element, and a second forwarding plane network element. And policy decision network elements.
  • the control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE, and when the control plane network element establishes a second DN connection with the second forwarding plane network element as an anchor point for the UE , the policy control session and the migration path migration.
  • This embodiment is directed to the system architecture shown in FIG. 3 and the application scenario shown in FIG. 5, that is, the policy control session is located between the forwarding plane network element and the policy decision network element.
  • the source BS in FIG. 10 is BS1 in FIG. 5, the target BS is BS2 in FIG. 5, the first forwarding plane network element is the forwarding plane network element 1 in FIG. 5, and the second forwarding plane network element is in FIG. Forwarding plane network element 2.
  • the specific scenario is described as follows: when the UE is located in the source BS, the control plane network element establishes a first DN connection with the first forwarding plane network element as an anchor point for the UE; when the UE moves to the target BS, the first DN is updated.
  • the forwarding path of the connection is such that it accesses the DN through the DN connection 1 or the DN connection 2 shown in FIG.
  • the policy triggered by the scenario controls the migration process of the session and/or the migration process of the forwarding path (when the UE moves to the target BS and accesses the DN through the DN connection 1 shown in FIG. 5, the migration process involving the forwarding path is involved.
  • the specific process refers to FIG. 10, and the method includes:
  • Step 431 The UE initiates a second DN connection establishment process, and sends a DN connection establishment request to the control plane network element by using the BS.
  • Step 432 The control plane network element determines that the second forwarding plane network element serves the UE.
  • Step 433 the control plane network element updates the forwarding path of the first DN connection, so that the forwarding path of the first DN connection passes through the second forwarding plane network element.
  • control plane network element can also establish a forwarding path of the second DN connection.
  • the step 433 may include: the control plane network element sends a session establishment request message to the second forwarding plane network element, where the session establishment request message is used to indicate that the second forwarding plane network element is established with the first forwarding plane network element. a packet forwarding path corresponding to the first DN connection, and indicating that the second forwarding plane network element establishes, by the control plane network element, a packet corresponding to the first DN connection between the base station serving the UE Forward path.
  • the session establishment request message may further indicate that the second forwarding plane network element establishes a packet forwarding path corresponding to the second DN connection between the base station serving the UE.
  • the method further includes the process of the second forwarding plane network element determining the first service policy rule corresponding to the first DN connection and the second service policy rule corresponding to the second DN connection.
  • the first service policy rule includes an indication identifier or tunnel information, where the indication identifier or the tunnel information is used to indicate that the second forwarding plane network element follows the intra-tunnel IP quintuple for the downlink packet received from the first forwarding plane network element. Perform flow detection. This process can be implemented by the following steps 434 and 435:
  • the signaling connection corresponding to the first DN connection is referred to as a first policy control session.
  • a policy control session is used to determine a service policy rule corresponding to the first DN connection, the service policy rule is referred to as a first service policy rule; and multiple policy control sessions between the second forwarding plane network element and the policy decision network element
  • the signaling connection corresponding to the second DN connection is referred to as a second policy control session, and the second policy control session is used to determine a service policy rule corresponding to the second DN connection, where the service policy rule is referred to as a second service a policy rule; in a plurality of policy control sessions between the first forwarding plane network element and the policy decision network element, the signaling connection corresponding to the first DN connection is referred to as a third policy control session, and the third policy control session It is used to determine a service policy rule corresponding to the first DN connection, and the service policy rule is referred to as a first service policy rule.
  • Step 434 The control plane network element sends a session establishment request message or a redirect response message to the second forwarding plane network element.
  • the session establishment request message sent by the control plane network element to the second forwarding plane network element in steps 433 and 434 may be the same session establishment request message.
  • Step 435 The second forwarding plane network element obtains the first service policy rule corresponding to the first DN connection and the second service policy rule corresponding to the second DN connection from the policy decision network element according to the session establishment request message or the redirect response message.
  • a policy control session the first control policy rule corresponding to the first DN connection is obtained from the policy decision network element, and the second service policy rule corresponding to the second DN connection is obtained through the policy control session; or
  • the two forwarding plane network elements establish two policy control sessions with the policy decision network element, and obtain the first service policy rule corresponding to the first DN connection from the policy decision network element through one of the policy control sessions, and control through another policy.
  • the session acquires a second service policy rule corresponding to the second DN connection.
  • the signal flow diagram shown in FIG. 10 is a second implementation manner, that is, a specific description between the second forwarding plane network element and the policy decision network element is:
  • Step 435a The second forwarding plane network element obtains a first service policy rule corresponding to the first DN connection by establishing a first policy control session with the policy decision network element.
  • Step 435b The second forwarding plane network element obtains a second service policy rule corresponding to the second DN connection by establishing a second policy control session with the policy decision network element.
  • step 435a there is no strict sequence of execution between step 435a and step 435b.
  • steps 435a-435b in the signal flow diagram described in FIG. 10 may be changed to the following processing procedure.
  • the second forwarding plane network element establishes a policy control session with the policy decision network element, and the first service policy rule corresponding to the first DN connection and the second service policy rule corresponding to the second DN connection are determined by the policy control session.
  • the second forwarding plane network element sends a policy control session establishment request to the policy decision network element, and carries the first DN connection identifier and the second DN connection identifier;
  • the policy decision network element determines a first service policy rule corresponding to the first DN connection and a second service policy rule corresponding to the second DN connection, and sends a policy control session establishment response message to the second forwarding plane network element, carrying the first Business policy rules and the second business policy rules.
  • steps 435a-435b in the signal flow diagram described in FIG. 10 may be changed to the following processing.
  • the second forwarding plane network element sends a policy control session establishment request to the policy decision network element, and carries the first DN connection identifier; the policy decision network element determines the first service policy rule corresponding to the first DN connection, and The second forwarding plane network element sends a policy control session establishment response message, carrying the first service policy Slightly rules.
  • the second forwarding plane network element sends a policy control session request message to the policy decision network element, and carries the second DN connection identifier.
  • the policy decision network element determines a second service policy rule corresponding to the second DN connection, and sends a policy control session request corresponding message to the second forwarding plane network element, and carries the second service policy rule.
  • steps 435a-435b in the signal flow diagram described in FIG. 10 may be changed to the following processing.
  • the second forwarding plane network element sends a policy control session establishment request to the policy decision network element, and carries the second DN connection identifier; the policy decision network element determines the second service policy rule corresponding to the second DN connection, and The second forwarding plane network element sends a policy control session establishment response message, and carries the second service policy rule.
  • the second forwarding plane network element sends a policy control session request message to the policy decision network element, and carries the first DN connection identifier.
  • the policy decision network element determines a first service policy rule corresponding to the first DN connection, and sends a policy control session request corresponding message to the second forwarding plane network element, and carries the first service policy rule.
  • the embodiment of the present invention further includes the process of deleting the third service policy rule corresponding to the first DN connection by the first forwarding plane network element, which may be implemented by the following steps 436-437:
  • Step 436 The policy decision network element sends a policy control session deletion request message to the first forwarding plane network element, where the policy control session deletion request message is used to delete the third policy control session between the first forwarding plane network element and the policy decision network element.
  • Step 437 The first forwarding plane network element sends a policy control session deletion response message to the policy decision network element.
  • step 438 the control plane network element sends a DN connection setup response to the UE through the BS.
  • the PDN network is taken as an example for illustration, and is not used to limit the present invention.
  • the policy control method provided by the embodiment of the present invention is applicable to other data network (DN) networks. Also applies.
  • DN data network
  • the forwarding plane path between the UE and the forwarding plane network element is The bearer granularity is taken as an example for explanation.
  • the forwarding plane path may also be a device granularity or a session granularity, which is not described in detail in the present invention.
  • the policy control session is specifically described by using a Gx session as an example; the DN connection is specifically described by using a PDN connection as an example.
  • multiple PDN connections may determine corresponding service policy rules through the same policy control session, or each PDN connection may also determine corresponding corresponding policies through respective corresponding control sessions.
  • Business strategy rules may be used.
  • Embodiment 5 Scenario: As shown in FIG. 5, after the UE moves, the PDN connection 1 is connected to the PDN network. At this time, there is a Gx session 1 between the forwarding plane network element 1 and the policy decision network element.
  • Solution: Gx session migration and forwarding path update are performed during the process of establishing a new PDN connection 3 by the UE.
  • the PDN connection 3 is connected to the PDN network through the forwarding plane network element 2.
  • the Gx session migration refers to the migration of the Gx session 1 to the Gx session 2, that is, the policy control session between the forwarding plane network element 1 and the policy decision network element is migrated between the forwarding network element 2 and the policy decision network element.
  • the forwarding path update refers to updating the forwarding path between the target BS and the forwarding plane network element 1 to a forwarding path between the target BS and the forwarding plane network element 2, the forwarding plane network element 2, and the forwarding plane network element 1. .
  • the above target BS may specifically be BS2 in FIG.
  • the Gx session 1 is migrated to the Gx session 2; the bearer between the target BS and the forwarding plane network element 1 is migrated between the target BS and the forwarding plane network element 2, and the forwarding plane network element 2 and the forwarding plane are forwarded.
  • Gx session 3 represents a policy control session between the forwarding plane network element 2 and the policy decision network element when the PDN connection 3 is established.
  • Gx Session 2 and Gx Session 3 can be different policy control sessions or the same policy control session.
  • Embodiment 6 Scenario: As shown in FIG. 5, after a mobile handover occurs, the UE is connected to the PDN network through the PDN connection 2. At this time, there is a Gx session 1 between the forwarding plane network element 1 and the policy decision network element.
  • Solution: Gx session migration is performed during the process of establishing a new PDN connection 3 by the UE.
  • the Gx session migration refers to the migration of the Gx session 1 to the Gx session 2, that is, the policy control session between the forwarding plane network element 1 and the policy decision network element is migrated between the forwarding network element 2 and the policy decision network element.
  • Gx session 3 represents a policy control session between the forwarding plane network element 2 and the policy decision network element when the PDN connection 3 is established.
  • the difference between the sixth embodiment and the fifth embodiment is that the scenario is different.
  • the PDN connection 2 is connected to the PDN network, and the PDN connection 2 passes through the forwarding plane network element 2, so only the session migration is performed. No migration migration is required.
  • Embodiment 7 Scenario: As shown in FIG. 5, after the UE moves, the UE is connected to the PDN network through the PDN connection 2. In the handover process, the UE accesses the PDN through the forwarding plane network element 2 and the forwarding plane network element 1. The internet. Solution: During the UE handover process, Gx session migration is performed.
  • the Gx session migration refers to the migration of the Gx session 1 to the Gx session 2, that is, the policy control session between the forwarding plane network element 1 and the policy decision network element is migrated between the forwarding network element 2 and the policy decision network element.
  • the difference between the seventh embodiment and the fifth and sixth embodiments is that the solution is different.
  • the solution of the fifth and sixth embodiments is to perform the Gx session migration in the process of the UE newly establishing the PDN connection; the solution of the seventh embodiment is in the UE handover process. Migrate the Gx session.
  • Embodiment 8 Scenario: As shown in FIG. 6, the Gx session is located between the control plane network element and the policy decision network element. After the mobile switching occurs in the UE, the PDN network 2 accesses the PDN network as an example for description. Solution: In the process of the UE establishing a PDN connection 3, the modification process of the Gx session is initiated.
  • each PDN connection is determined by using a corresponding Gx session to determine a service policy rule.
  • a plurality of PDN connections are used to determine a corresponding service policy rule by using the same Gx session. Be explained.
  • Embodiments 5 through 8 of the present invention are described in more detail below in conjunction with signal flow diagrams.
  • the PDN network is accessed through the PDN connection 1, which is referred to as the original PDN connection in this embodiment.
  • the anchor point is the forwarding plane network element 1 is called the original anchor point;
  • the PDN connection 3 is the newly established PDN connection of the UE, and the corresponding anchor point is the forwarding plane network element 2, which is called the target anchor point.
  • the technical solution of the embodiment is: in the process of the UE establishing a PDN connection, if the control plane network element determines that the anchor point corresponding to the new PDN connection is different from the original PDN connection, the Gx session migration and the bearer migration process are triggered.
  • FIG. 11 is a signal flow diagram of a policy control method according to Embodiment 5 of the present invention. Referring to FIG. 11, the method includes:
  • step 501 the UE decides to initiate a new PDN connection establishment process.
  • the UE determines the basis for initiating a new PDN connection establishment, which may be based on the correspondence between the PDN connection and the location area information saved by the UE, that is, when the current location of the UE is not included in any location area in the corresponding relationship, A new PDN connection is established.
  • the location area information may be a cell list, or a tracking area list (TAI list), or a location area identifier, or a base station identification group, or a physical location range, and the like.
  • TAI list tracking area list
  • the location area information may be a cell list, or a tracking area list (TAI list), or a location area identifier, or a base station identification group, or a physical location range, and the like.
  • Step 502 The UE sends a PDN connection establishment request message to the control plane network element by using the base station.
  • Step 503 The control plane network element determines that the forwarding plane network element 2 serves the UE.
  • the control plane network element determines the basis of the forwarding plane network element, which may be based on the current location information of the UE or BS ID, and the service range of the forwarding plane network element.
  • Step 504 The control plane network element sends a session establishment request message to the forwarding plane network element 2.
  • the session establishment request message further carries the address of the original anchor point and the identifier of the PDN connection 1, that is, forwarding
  • the address of the network element 1 and the identifier of the PDN connection 1 are used to indicate that the forwarding plane network element 2 performs Gx session migration and bearer migration of the original PDN connection, so as to prevent the UE from having multiple policy decision execution points.
  • Step 505 The forwarding plane network element 2 initiates a process of establishing a policy control session with the policy decision network element, that is, a process of establishing a Gx session 3 corresponding to the PDN connection 3.
  • the policy decision network element determines the service policy rule corresponding to the PDN connection 3, and sends the service policy rule to the forwarding plane network element 2.
  • the specific process description is that the forwarding plane network element 2 sends a policy control session establishment request message to the policy decision network element, and carries the connection identifier of the PDN connection 3; the policy decision network element determines the service policy rule corresponding to the PDN connection 3, and forwards the service policy rule to the forwarding plane.
  • the network element 2 sends a policy control session establishment response message carrying the service policy rule corresponding to the PDN connection 3.
  • the service policy rule corresponding to the PDN connection 3 is used to instruct the forwarding plane network element 2 to process the packet of the PDN connection 3.
  • Step 506 The forwarding plane network element 2 sends a bearer modification request message to the forwarding plane network element 1 according to the session establishment request message received in step 504.
  • the bearer modification request message carries a tunnel endpoint identifier (TEID, Tunnel Endpoint Identity) of the forwarding plane network element 2, and a connection identifier of the PDN connection 1.
  • TEID tunnel endpoint identifier
  • PDN connection connection identifier
  • step 506 and step 505 there is no sequence of execution, and steps 505 and 506 may also occur at the same time, which is not limited by the embodiment of the present invention.
  • the forwarding plane network element 1 sends a bearer modification response message to the forwarding plane network element 2, and carries the tunnel endpoint identifier of the forwarding plane network element 1 and the connection identifier of the PDN connection 1.
  • Steps 507-508 the forwarding plane network element 2 sends a forwarding plane network element redirection notification message to the BS via the control plane network element, and carries the tunnel endpoint identifier of the forwarding plane network element 2 and the connection identifier of the PDN connection 1.
  • Step 509-5010 The BS sends a redirect response message to the forwarding plane network element 2 via the control plane network element, and carries the tunnel endpoint identifier of the BS and the connection identifier of the PDN connection 1.
  • Step 5011 After receiving the redirect response message, the forwarding plane network element 2 initiates a process of establishing a policy control session between the forwarding plane network element and the policy decision network element, that is, the establishment process of the Gx session 2 corresponding to the PDN connection 1. Specifically, the forwarding plane network element 2 sends a policy control to the policy decision network element. a session establishment request message carrying the connection identifier of the PDN connection 1;
  • Steps 5012-5013 the policy decision network element determines the service policy rule corresponding to the PDN connection 1, and sends a policy control session establishment response message to the forwarding plane network element 2, and carries the service policy rule corresponding to the PDN connection 1.
  • the service policy rule corresponding to the PDN connection 1 is used to instruct the forwarding plane network element 2 to process the packet of the PDN connection 1.
  • the service policy rule corresponding to the PDN connection 1 includes the indication identifier or the tunnel information, and is used to indicate that the forwarding plane network element 2 performs flow detection on the downlink packet from the forwarding plane network element 1 according to the IP quintuple in the tunnel.
  • the tunnel information may be a tunnel endpoint identifier of the forwarding plane network element 2.
  • each PDN connection determines a corresponding service policy rule by using a corresponding policy control session, that is, step 505 determines a service policy rule corresponding to the PDN connection 3, and steps 5011-5013 determine that the PDN connection 1 corresponds.
  • Business strategy rules When multiple PDN connections are determined by the same policy control session to determine the corresponding service policy rule, that is, when Gx session 2 and Gx session 3 are the same Gx session, the policy control session establishment process shown in steps 5011-1053 should be changed to The business process rule acquisition process, the specific process is described as:
  • the forwarding plane network element 2 sends a policy control session request message to the policy decision network element, and carries the connection identifier of the PDN connection 1, optionally carrying the connection identifier of the PDN connection 3.
  • the policy decision network element determines the service policy rule corresponding to the PDN connection 1, and sends a policy control session response message to the forwarding plane network element 2, and carries the service policy rule corresponding to the PDN connection 1.
  • the service policy rule corresponding to the PDN connection 1 includes the indication identifier or the tunnel information, and is used to indicate that the forwarding plane network element 2 performs flow detection on the downlink packet from the forwarding plane network element 1 according to the IP quintuple in the tunnel.
  • the policy decision network element further determines a service policy rule corresponding to the PDN connection.
  • the policy control session corresponding message also carries the service policy rule corresponding to the PDN connection 3.
  • Step 5014 The policy decision network element initiates a deletion process of the policy control session between the forwarding plane network element 1 and the policy decision network element, that is, the deletion process of the Gx session 1.
  • the Gx session 1 deletion process may specifically include:
  • step 5014a the policy control network element sends a policy control session deletion request message to the forwarding plane network element 1, and carries the connection identifier of the PDN connection 1.
  • Steps 5014b-5014c the forwarding plane network element 1 deletes the service policy rule related to the PDN connection 1, and sends a policy control session deletion response message to the policy decision network element.
  • the Gx session 1 deletion process may occur in any step after step 5011, The embodiments of the invention are not limited.
  • step 5015 the forwarding plane network element 2, the control plane network element, the BS, and the UE perform signaling interaction, complete radio resource reconfiguration of the PDN connection 3, and establish bearer between the BS and the forwarding plane network element 2.
  • step 5015 The specific process description of step 5015 can be:
  • the forwarding plane network element 2 sends a session establishment response message to the control plane network element, where the session establishment response message includes the tunnel endpoint identifier of the forwarding plane network element 2.
  • This step 5015a is the response of step 504.
  • Step 5015b The control plane network element sends a bearer setup request message to the BS, where the bearer setup request message carries the tunnel endpoint identifier of the forwarding plane network element 2.
  • steps 5015c-5015d the BS initiates a radio resource reconfiguration procedure with the UE.
  • Step 5015e The BS sends a bearer setup response message to the control plane network element, where the bearer setup response message carries the BS TEID.
  • Steps 5015f-5015g the UE sends a PDN connection setup complete message to the control plane network element through the BS.
  • the control plane network element sends a bearer modification request message to the forwarding plane network element 2, where the bearer modification request message includes the parameter BS TEID; the forwarding plane network element 2 sends a bearer modification response message to the control plane network element.
  • step 5015 The process described in step 5015 is a prior art, and details are not described herein.
  • the scenario described in the embodiment of the present invention is that after the UE performs mobile handover, the target BS is connected to the original forwarding plane network element 1 to connect to the PDN network.
  • the control plane network element determines that the anchor point corresponding to the new PDN connection is different from the anchor point corresponding to the original PDN connection, to avoid the UE having multiple policy enforcement points, the bearer migration and The Gx session is migrated so that all PDN connections pass through the same forwarding plane network element and are controlled by the forwarding plane network element.
  • the policy controls the migration of the session and the migration of the forwarding path, so that all the PDN connections pass through the same forwarding plane network element, and the UE of the forwarding plane performs the policy on the UE. control.
  • the PDN connection is accessed through the PDN connection 2.
  • the PDN connection 2 is referred to as the original PDN connection, and the corresponding anchor point is forwarded.
  • the surface network element 1 is called the original anchor point;
  • the PDN connection 3 is the newly established PDN connection of the UE, and the corresponding anchor point is the forwarding plane network element 2, which is called the target anchor point.
  • the technical solution of the embodiment is: in the process of the UE establishing a PDN connection, if the control plane network element determines that the anchor point corresponding to the newly created PDN connection is different from the original PDN connection, and the original PDN connection passes the anchor corresponding to the new PDN connection.
  • the point is triggered to control the session migration, and the policy control session between the forwarding plane network element 1 and the policy decision network element is migrated between the forwarding plane network element 2 and the policy decision network element.
  • Gx session 1 is a policy control session corresponding to the original PDN connection (ie, PDN connection 2), that is, a policy control session between the forwarding plane network element 1 and the policy decision network element; and Gx session 2 is a Gx session migration.
  • the original PDN is connected to the policy control session.
  • the Gx session 3 is the policy control session corresponding to the new PDN connection (that is, the PDN connection 3), that is, the policy control session between the forwarding plane network element 2 and the policy decision network element.
  • the policy control method includes:
  • step 601 the UE initiates a new PDN connection establishment process.
  • the UE determines the basis for initiating a new PDN connection establishment, which may be a correspondence between the PDN connection and the location area information saved by the UE, that is, when the current location of the UE is not included in any location area in the corresponding relationship, the new The conditions under which the PDN connection is established.
  • the location area information may be a cell list, or a tracking area list, or a location area identifier, or a base station identification group, or a physical location range, and the like.
  • Step 602 The UE sends a PDN connection establishment request message to the control plane network element by using the base station.
  • Step 603 The control plane network element determines that the forwarding plane network element 2 serves the UE.
  • the control plane network element determines the basis of the forwarding plane network element, which may be based on the current location information or the BS ID of the UE, and the service range of the forwarding plane network element.
  • Step 604 the control plane network element sends a session establishment request message to the forwarding plane network element 2.
  • the session establishment request message includes the connection identifier of the original PDN connection, and is used to indicate that the forwarding plane network element 2 initiates the original PDN. Connect the corresponding policy to control the session establishment process.
  • This embodiment is also applicable to a case where there are multiple PDN connections. This embodiment is described by taking only two PDN connections (one of which is the original PDN connection) as an example.
  • the forwarding plane network element 2 initiates two policy control with the policy decision network element after receiving the session establishment request message of the control plane network element.
  • the process of establishing a session where the two policy control sessions are respectively a policy control session corresponding to the PDN connection 3 (ie, Gx session 3) and a policy control session corresponding to the PDN connection 2 (ie, Gx session 2), and the specific process is as follows. 605-607 stated:
  • step 605 the forwarding plane network element 2 initiates a process of establishing the Gx session 3.
  • the forwarding plane network element 2 sends a policy control session establishment request message to the policy decision network element, and carries the connection identifier of the PDN connection 3; the policy decision network element determines the service policy rule corresponding to the PDN connection 3, and sends the policy control to the forwarding plane network element 2
  • the session session establishment response message carries the service policy rule corresponding to the PDN connection 3.
  • step 606 the forwarding plane network element 2 initiates the establishment process of the Gx session 2, and sends a policy control session establishment request message to the policy decision network element, and carries the connection identifier of the PDN connection 1.
  • Step 607 The policy decision network element determines the service policy rule corresponding to the PDN connection 1, and sends a policy control call establishment response message to the forwarding plane network element 2, and carries the service policy rule corresponding to the PDN connection 1.
  • the service policy rule corresponding to the PDN connection 1 includes the indication identifier or the tunnel information, and is used to indicate that the forwarding plane network element 2 performs flow detection on the downlink packet from the forwarding plane network element 1 according to the IP quintuple in the tunnel.
  • Step 608 The forwarding plane network element 2 sends a bearer modification request message to the forwarding plane network element 1.
  • the bearer modification request message is used to indicate that the forwarding plane network element 1 has completed the migration of the Gx session 1.
  • the Gx session 1 refers to the policy control session between the forwarding plane network element 1 and the policy decision network element.
  • step 609 the forwarding plane network element 1 initiates a release procedure of the Gx session 1.
  • the Gx session 1 release process described in step 609 may also be initiated by the policy decision network element.
  • the step may occur at any step after step 606, which is not limited by the present invention.
  • step 608 the following steps may also be included.
  • Step 6010 The forwarding plane network element 1 sends a bearer modification response message to the forwarding plane network element 2.
  • Step 6011 complete reconfiguration of the radio resource of the newly created PDN connection 3, and BS and forwarding The establishment of the bearer between the surface network elements 2.
  • steps 605-607 are replaced by the following processes:
  • the forwarding plane NE 2 initiates the Gx session 3 establishment process.
  • the specific process description is as follows:
  • the forwarding plane network element 2 sends a policy control session establishment request message to the policy decision network element, and carries the connection identifier of the PDN connection 2 and the connection identifier of the PDN connection 3.
  • the policy decision network element determines the service policy rule corresponding to the PDN connection 2 and the service policy rule corresponding to the PDN connection 3, and sends a policy control session establishment response message to the forwarding plane network element 2, carrying the service policy rule corresponding to the PDN connection 2, and PDN connection 3 corresponds to the business policy rule.
  • the service policy rule corresponding to the PDN connection 2 is used to instruct the forwarding plane network element 2 to perform policy control on the packet of the PDN connection 2; the service policy rule corresponding to the PDN connection 3 is used to indicate the forwarding plane network element 2 pair.
  • the PDN is connected to the packet of ⁇ 3 for policy control.
  • the service policy rule corresponding to the PDN connection 1 carries the indication identifier or the tunnel information, and is used to indicate that the forwarding plane network element 2 performs flow detection on the downlink packet from the forwarding plane network element 1 according to the IP quintuple in the tunnel.
  • the tunnel information may be the TEID of the forwarding plane network element 2.
  • This embodiment describes a scenario in which the target BS and the target forwarding plane network element 2 are connected to the original forwarding plane network element 1 to connect to the PDN network after the UE moves.
  • the control plane network element determines that the anchor point corresponding to the new PDN connection and the anchor point corresponding to the original PDN connection are not available, to avoid the UE having multiple policy enforcement points, the migration through the Gx session Ensure that all PDN connections pass through the same forwarding plane network element and perform policy control through the forwarding plane network element to avoid policy control of UE granularity or APN granularity cannot be performed due to the dispersion of service flow paths.
  • the improvement of the inventive solution is different from the prior art in that the UE performs the migration of the Gx session during the process of creating a new PDN connection.
  • the control plane network element determines that the new forwarding plane network element is serving the UE, the UE triggers the migration process of the Gx session.
  • the policy control method includes:
  • step 701 the source BS initiates a handover, and the UE synchronizes to the target BS.
  • Step 702 The UE sends a handover confirmation message to the target BS.
  • the handover confirmation message is used to indicate that the UE successfully synchronizes to the target BS.
  • Step 703 The target BS sends a handover notification message to the control plane network element.
  • Step 704 The control plane network element determines that the forwarding plane network element 2 with the better location serves the UE, and sends a bearer modification request message to the forwarding plane network element 2.
  • the bearer modification request message includes an IP address of the target BS and a TEID of the target BS.
  • step 705 the forwarding plane network element 2 initiates a Gx session 2 establishment process.
  • the forwarding plane network element 2 sends a policy control session establishment request message to the policy decision network element;
  • the policy decision network element determines the service policy rule corresponding to the PDN connection 2, and sends a policy control session establishment response message to the forwarding plane network element 2, and carries the service policy rule corresponding to the PDN connection 2;
  • the service policy rule corresponding to the PDN connection 2 includes the indication identifier or the tunnel information, and is used to indicate that the forwarding plane network element 2 performs flow detection on the downlink packet from the forwarding plane network element 1 according to the IP quintuple in the tunnel.
  • Step 706 The forwarding plane network element 2 sends a bearer modification request message to the forwarding plane network element 1, and carries the TEID of the forwarding plane network element 2.
  • the steps 705 and 706 are not strictly performed, and may also occur at the same time, which is not limited by the present invention.
  • Step 707 After receiving the bearer modification request message from the forwarding plane network element 2, the forwarding plane network element 1 initiates a deletion process of the Gx session 1.
  • step 707a the forwarding plane network element 1 sends a policy control session modification request message to the policy decision network element.
  • Step 708 The policy decision network element sends a policy control session modification response message to the forwarding plane network element 1.
  • Step 709 The forwarding plane network element 1 deletes the service policy rule related to the Gx session 1 according to the received policy control session modification response message.
  • Step 7010 The forwarding plane network element 1 sends a bearer modification response message to the forwarding plane network element 2.
  • the bearer modification response message is a response message of step 706.
  • Step 7011 The forwarding plane network element 2 sends a bearer modification response message to the control plane network element.
  • the bearer modification response message is a response message of step 704, including an IP address of the forwarding plane network element 2, and a TEID of the forwarding plane network element 2.
  • Step 7012 When the tracking area update TAU condition is met, the UE initiates a TAU procedure.
  • the method further includes the following steps:
  • step 7013 the UE initiates a setup process of the new PDN connection 3.
  • the control plane network element determines that the forwarding plane network element 2 serves the UE, and the forwarding plane network element 2 initiates the establishment process of the Gx session 3 between the policy decision network element, and the policy decision network element performs the policy.
  • the service policy rule corresponding to the newly created PDN connection is sent to the forwarding plane network element 2.
  • the forwarding plane network element 2 passes the policy decision network element in the process of establishing the new PDN connection 3 initiated by the UE (step 7013).
  • the service policy rule acquisition process is initiated to determine the service policy rule corresponding to the PDN connection 3.
  • the scenario described in this embodiment is a scenario in which the target BS and the target forwarding plane network element 2 are connected to the original forwarding plane network element 1 to connect to the PDN network.
  • the control plane network element determines that the new forwarding plane network element with the better location is serving the UE, the new forwarding plane network element initiates the policy control session migration process, so that the policy control execution point of the PDN connection is located.
  • the forwarding plane network element with better location is a scenario in which the target BS and the target forwarding plane network element 2 are connected to the original forwarding plane network element 1 to connect to the PDN network.
  • the improvement of the seventh embodiment of the present invention is that the UE moves the policy execution point to the forwarding plane network element with better location by the policy control session migration process during the handover process.
  • this embodiment is described by taking the PDN connection 2 to access the PDN network after the UE performs the mobile handover.
  • the policy control session is located between the control plane network element and the policy decision network element, and multiple PDN connections determine corresponding service policy rules through the same policy control session.
  • the PDN connection 2 is a PDN connection after the UE moves the handover.
  • This embodiment is referred to as the original PDN connection, and the corresponding anchor point is the forwarding plane network element 1, which is called the original anchor point;
  • the PDN connection 3 is The newly established PDN connection of the UE, and the corresponding anchor point is the forwarding plane network element 2, which is called a target anchor point.
  • the technical solution of the embodiment is that, in the process of establishing a PDN connection, if the control plane network element determines that the anchor point corresponding to the new PDN connection of the UE is different from the original anchor point, in order to prevent the UE from having multiple policy execution points, Then, the policy execution point is migrated to the anchor point corresponding to the newly created PDN connection.
  • the policy control method includes:
  • step 801 the UE initiates a new PDN connection establishment process.
  • the UE determines the basis for initiating a new PDN connection establishment, which may be a correspondence between the PDN connection and the location area information saved by the UE, that is, when the current location of the UE is not included in any location area in the corresponding relationship, the new PDN connection establishment conditions.
  • the location area information may be a cell list, or a tracking area list, or a location area identifier, or a base station identification group, or a physical location range, and the like.
  • Step 802 The UE sends a PDN connection establishment request message to the control plane network element by using the base station.
  • the PDN connection setup request message carries the current location information of the UE.
  • Step 803 The control plane network element determines that the forwarding plane network element 2 serves the UE.
  • the basis for determining the forwarding plane network element may be based on the current location information or the BS ID of the UE, and the service range of the forwarding plane network element.
  • Step 804 The control plane network element determines that the anchor point corresponding to the new PDN connection of the UE is different from the original anchor point, initiates a service policy rule acquisition process, and sends a policy control session request message to the policy decision network element.
  • the policy control session request message carries a connection identifier of the PDN connection 3 and a connection identifier of the PDN connection 2.
  • the identifier of the anchor point corresponding to the new PDN connection that is, the identifier of the forwarding plane network element 2
  • Steps 805-806 the policy decision network determines the service policy rule corresponding to the PDN connection 3, and the service policy rule corresponding to the PDN connection 2, and sends a policy control session response message to the control plane network element, carrying the service policy rule corresponding to the PDN connection 3. And the business policy rules corresponding to PDN connection 2.
  • the service policy rule corresponding to the PDN connection 2 is used to instruct the forwarding plane network element 2 to perform policy control on the packet of the PDN connection 2; the service policy rule corresponding to the PDN connection 3 is used to indicate the forwarding plane network element 2 to the PDN connection. 3 The corresponding message is controlled by the policy.
  • the service policy rule corresponding to the PDN connection 2 includes the indication identifier or the tunnel information, and is used to indicate that the forwarding plane network element 2 performs flow detection on the downlink packet from the forwarding plane network element 1 according to the IP quintuple in the tunnel.
  • Step 807 The control plane network element sends a service policy rule deletion request message to the forwarding plane network element 1.
  • the policy rule deletion request message is used to delete the service policy rule about the PDN connection 2 on the forwarding plane network element 1, and carry the identifier of the service policy rule.
  • the service policy rule identifier is used to indicate a service policy rule to be deleted, and may be a PDN connection identifier.
  • the The business policy rule is identified as the connection identifier of PDN connection 2.
  • Steps 808-809 the forwarding plane network element 1 deletes the service policy rule corresponding to the PDN connection 2, and sends a service policy rule deletion response message to the control plane network element.
  • the service policy rule deletion request/response message described in the step 807, 809 may be a message when the multiple PDN connection is established in the existing EPC network, such as a bearer modification request/response message.
  • step 8010 the reconfiguration of the radio resource between the UE and the BS is completed, and the control plane network element sends a packet forwarding policy to the forwarding plane network element 2.
  • the packet forwarding policy carries the service policy rule in step 806.
  • Step 8010 may take any step after step 806.
  • the specific execution sequence is not limited in the present invention.
  • steps 804-809 may be replaced by the following process:
  • the control plane network element initiates a service policy rule acquisition process and a policy control session establishment process to the policy decision network element.
  • the service policy rule obtaining process refers to that the control plane network element obtains the service policy rule corresponding to the PDN connection 2 from the policy decision network element; the policy control session establishment process refers to the control corresponding to the new PDN connection 3. A policy control session between the network element and the policy decision network element, and the policy control session determines the service policy rule corresponding to the PDN connection 3.
  • the control plane network element sends a policy control session request to the policy decision network element, and carries the PDN connection 2 identifier and the forwarding plane network element 2 identifier; the policy decision network element re-determines the corresponding service policy for the PDN connection 2
  • the rule sends a policy control session response message to the control plane network element, and carries the service policy rule corresponding to the PDN connection 2.
  • the service policy rule corresponding to the PDN connection 2 includes the indication identifier or the tunnel information, and is used to indicate that the forwarding plane network element 2 performs flow detection on the downlink packet from the forwarding plane network element 1 according to the IP quintuple in the tunnel.
  • the control plane network element sends a policy control session establishment request to the policy decision network element, and carries the PDN connection 3 identifier and the forwarding plane network element 2 identifier.
  • the policy decision network element determines the corresponding service policy rule for the new PDN connection 3, and sends the service policy rule corresponding to the PDN connection 3 to the control plane network element.
  • the policy execution point is located in the new policy.
  • the PDN is connected to the corresponding anchor point.
  • the ninth embodiment of the present invention is improved in comparison with the prior art in that the UE performs the migration process of the policy execution point in the process of creating a new PDN connection, so that the policy execution point is located at the anchor point corresponding to the newly created PDN connection.
  • PDN connections are taken as an example.
  • One PDN connection is the original PDN connection, and the other PDN connection is the newly established PDN connection.
  • the processing is similar.
  • the original 10 PDN connections are all original PDN connections, and a new PDN connection is established.
  • the PDN connection is a newly established PDN connection.
  • the bearer migration process and the Gx session migration process of the multiple original PDN connections may be combined and are not described herein.
  • FIG. 15 is a structural diagram of a control plane network element, where the control plane network element is used to implement the function of a control plane network element in a policy control method provided by an embodiment of the present invention, where the control plane network element is a UE Establishing a first DN connection with the first forwarding plane network element as an anchor point; the control plane network element includes:
  • the memory 1501 is configured to store program instructions
  • the processor 1502 is configured to perform the following operations according to the program instructions stored in the memory 1501:
  • the second forwarding plane network element serves the UE, or when the second forwarding plane network element is established as an anchor point for the UE.
  • the forwarding path of the first DN connection is updated, so that the updated forwarding path of the first DN connection passes through the second forwarding plane network element, and the second forwarding plane network element pair
  • the packet of the first DN connection is controlled by a policy.
  • the processor 1502 performs the updating of the forwarding path of the first DN connection, after the updated forwarding path of the first DN connection passes the operation of the second forwarding plane network element,
  • the processor 1502 is further configured to perform the following operations according to the program instructions stored in the memory 1501:
  • the decision network element obtains the updated first service policy rule corresponding to the first DN connection, and performs policy control on the updated message of the first DN connection according to the first service policy rule;
  • the communication interface 1503 Acquiring, by the communication interface 1503, the updated first DN from the policy decision network element Corresponding to the first service policy rule; the first service policy rule is sent to the second forwarding plane network element by using the communication interface 1503, where the first service policy rule is used to update the first A DN-connected message carries out policy control.
  • the processor 1502 performs the operation of establishing, by the UE, a second DN connection with the second forwarding plane network element as an anchor point, including:
  • the policy decision network element obtains the second service policy rule corresponding to the second DN connection, and performs policy control on the second DN connected message according to the second service policy rule; or
  • the second service policy rule is used to perform policy control on the packet connected by the second DN.
  • the processor 1502 performs the first service policy rule and the second DN connection corresponding to the updated first DN connection obtained by the policy decision network element through the communication interface 1503.
  • the operation of the corresponding second business policy rule includes:
  • the first service policy rule corresponding to the DN connection, and the second service policy rule corresponding to the second DN connection is obtained through the communication interface 1503 by using the other one of the two policy control sessions.
  • the processor 1502 performs a policy control session between the establishing and the policy decision network element, and the policy control session is obtained from the policy decision network element by using the communication interface 1503.
  • the operations of the first service policy rule corresponding to the first DN connection and the second service policy rule corresponding to the second DN connection include:
  • the communication interface 1503 Transmitting, by the communication interface 1503, the first policy control session establishment to the policy decision network element a request message, the first policy control session establishment request message carries a connection identifier of the first DN connection and a connection identifier of the second DN connection; and the policy decision network element is received by the communication interface 1503. a first service policy rule corresponding to the updated first DN connection and a second service policy rule corresponding to the second DN connection sent by the first policy control session establishment request message; or
  • the processor 1502 performs two policy control sessions between the establishment and the policy decision network element, and one of the policy control sessions through the two policy control sessions through the communication interface 1503 from the policy decision network. Obtaining, by the element, the first service policy rule corresponding to the updated first DN connection, and acquiring, by the communication interface 1503, the second DN connection corresponding to the another one of the two policy control sessions.
  • the operation of the second business policy rule includes:
  • the first service policy rule corresponding to the updated first DN connection sent by the policy decision network element according to the third policy control session establishment request message is sent to the policy decision by the communication interface 1503.
  • the network element sends a fourth policy control session establishment request message, where the fourth policy control session establishment request message carries the connection identifier of the second DN connection; and the policy decision network element is received by the communication interface 1503 according to the The fourth policy controls a second service policy rule corresponding to the second DN connection sent by the session establishment request message.
  • the first service policy rule includes the indication identifier or the tunnel information, where the indication identifier or the tunnel information is used to indicate that the second forwarding plane network element is received from the first forwarding plane network element.
  • the downlink packet is detected by the IP quintuple in the tunnel.
  • the processor 1502 performs the updating of the forwarding of the first DN connection. And the path, the operation of the updated forwarding path of the first DN connection to the second forwarding plane network element, including:
  • a session establishment request message to the second forwarding plane network element, where the session establishment request message is used to indicate that the second forwarding plane network element is established between the first forwarding plane network element and the first forwarding plane network element And a packet forwarding path corresponding to the first DN connection, and indicating that the second forwarding plane network element is established by the control plane network element and the base station serving the UE a packet forwarding path corresponding to a DN connection; or,
  • the third packet forwarding policy, the first packet forwarding policy, the second packet forwarding policy, and the third packet forwarding policy are used to establish the first forwarding plane corresponding to the first DN connection a packet forwarding path between the network element and the second forwarding plane network element and a packet forwarding path between the second forwarding plane network element and the base station.
  • the processor 1502 after the processor 1502 performs the obtaining, by the communication interface 1503, the first service policy rule corresponding to the updated first DN connection from the policy decision network element, the processor further Used to perform the following operations according to program instructions stored in the memory:
  • FIG. 16 is a structural diagram of a forwarding plane network element according to an embodiment of the present invention, where the forwarding plane network element is a second forwarding plane network element, and the UE has a first DN connection with the first forwarding plane network element as an anchor point,
  • the second forwarding plane network element includes: a memory 1601 and a processor 1602;
  • the memory 1601 is configured to store program instructions
  • the processor 1602 is configured to perform the following operations according to the program instructions stored in the memory 1601:
  • Policy control is performed on the updated message of the first DN connection.
  • the second forwarding plane network element further includes a communication interface 1603;
  • the processor 1602 performs the policy control operation on the updated message of the first DN connection, including:
  • the DN-connected packets are controlled by policies.
  • the UE further has a second DN connection with the second forwarding plane network element as an anchor point
  • the processor 1602 is further configured to perform the following operations according to the program instructions stored in the memory 1601:
  • the processor 1602 performs the first service policy rule and the second DN connection corresponding to the updated first DN connection obtained from the policy decision network element by using the communication interface 1603.
  • the operation of the corresponding second business policy rule includes:
  • the processor 1602 performs a policy control session between the establishing and the policy decision network element, and the policy control session is obtained from the policy decision network element by using the communication interface 1603.
  • the operations of the first service policy rule corresponding to the first DN connection and the second service policy rule corresponding to the second DN connection include:
  • the communication interface 1603 Sending, by the communication interface 1603, the first policy control session establishment request message to the policy decision network element, where the first policy control session establishment request message carries the connection identifier of the first DN connection and the second DN a connection identifier of the connection; receiving, by the communication interface 1603, a first service policy rule and a corresponding to the updated first DN connection sent by the policy decision network element according to the first policy control session establishment request message
  • the second DN is connected to the second service policy rule;
  • the first service policy rule corresponding to the second DN connection sent by the policy decision network element according to the second policy control session establishment request message is sent to the policy decision network element by using the communication interface 1603.
  • the processor 1602 performs two policy control sessions between the establishment and the policy decision network element, and one of the policy control sessions passes through the communication interface 1603 from the policy decision network through the two policy control sessions.
  • the operation of the second business policy rule includes:
  • the first service policy rule corresponding to the updated first DN connection sent by the policy decision network element according to the third policy control session establishment request message is received by the policy decision network element, and the policy decision is made to the policy through the communication interface 1603.
  • the NE sends the fourth policy control session. And establishing, by the fourth policy control session establishment request message, the connection identifier of the second DN connection; receiving, by the communication interface 1603, the policy decision network element, according to the fourth policy, a session establishment request A second service policy rule corresponding to the second DN connection sent by the message.
  • the processor 1602 performs the operation of updating the forwarding path of the first DN connection, including:
  • a second packet forwarding policy sent by the control plane network element so that the second forwarding plane network element is configured according to the second packet forwarding policy, the first forwarding plane network element And, according to the first packet forwarding policy received from the control plane network element, establishing packet forwarding between the first forwarding plane network element and the second forwarding plane network element corresponding to the first DN connection
  • the second forwarding plane network element establishes and performs the third packet forwarding policy according to the second packet forwarding policy and the base station serving the UE according to the third packet forwarding policy received from the control plane network element.
  • FIG. 17 is a structural diagram of a policy decision network element according to an embodiment of the present invention.
  • the UE has a first DN connection with a first forwarding plane network element as an anchor point, and the policy decision network element includes: a memory 1701 and a processor 1702. And communication interface 1703;
  • the memory 1701 is configured to store program instructions
  • the processor 1702 is configured to perform the following operations according to the program instructions stored in the memory 1701:
  • the processor 1702 is further configured to perform the following operations according to the program instructions stored in the memory 1701:
  • the first policy control session establishment request message further carries a connection identifier of the second DN connection, where the second DN connection is anchored by the second forwarding plane network element; and the session establishment request is controlled according to the first policy.
  • Sending, by the communication interface 1703, the second service policy rule corresponding to the second DN connection to the second forwarding plane network element or the control plane network element, where the second service policy rule is used to The second DN connected message is controlled by the policy; or,
  • the second forwarding plane network element or the second policy control session establishment request message sent by the control plane network element, where the second policy control session establishment request message carries the second DN a connection identifier of the connection; the second session control session establishment request message is sent to the second forwarding plane network element or the control plane network element by the communication interface 1703 to send a second corresponding to the second DN connection.
  • the service policy rule is configured to perform policy control on the packet of the second DN connection.
  • the processor 1702 performs the first session control session establishment request message according to the first policy, and sends the first to the second forwarding plane network element or the control plane network element through the communication interface 1703. After the DN is connected to the corresponding first service policy rule, the processor 1702 is further configured to perform the following operations according to the program instructions stored in the memory 1701:
  • a policy control session deletion request message to the first forwarding plane network element or the control plane network element, where the policy control session deletion request message is used to delete the first forwarding plane network element and The policy determines a policy control session between the network elements or deletes a policy control session between the control plane network element and the policy decision network element.
  • FIG. 18 is a structural diagram of another control plane network element according to an embodiment of the present invention.
  • the control plane network element is used to implement the function of a control plane network element in the policy control method provided by the embodiment of the present invention, where the control plane network element is The UE establishes a first DN connection with the first forwarding plane network element as an anchor point; the control plane network element includes: a receiving unit 1801 and a processing unit 1802;
  • the receiving unit 1801 is configured to receive a message or an instruction sent by another network element.
  • the receiving unit 1801 can be specifically received by the foregoing communication interface 1503.
  • the processing unit 1802 is configured to: when the receiving unit 1801 receives the handover notification message of the UE, determine that the second forwarding plane network element serves the UE, or establish a second forwarding network for the UE When the second DN of the anchor is connected, the forwarding path of the first DN connection is updated, so that the updated forwarding path of the first DN connection passes through the second forwarding plane network element, and the second The forwarding plane network element performs policy control on the packet of the first DN connection.
  • the processing unit 1802 may specifically be the foregoing processor 1502.
  • control plane network element further includes a sending unit 1803;
  • the sending unit 1803 is configured to send a message or an instruction to other network elements.
  • the sending unit 1803 may specifically transmit through the foregoing communication interface 1503.
  • the processing unit 1802 is further configured to:
  • the indication sending unit 1803 sends a session establishment request message or a redirect response message to the second forwarding plane network element, where the session establishment request message or the redirect response message is used to indicate the second forwarding plane network element from the policy decision network.
  • the indication receiving unit 1801 obtains the updated first service policy rule corresponding to the first DN connection from the policy decision network element, and the indication sending unit 1803 sends the first service policy rule to the second forwarding network.
  • the first service policy rule is used to perform policy control on the updated packet of the first DN connection.
  • processing unit 1802 is specifically configured to:
  • the indication sending unit 1803 sends a session establishment request message or a redirect response message to the second forwarding plane network element, where the session establishment request message or the redirect response message is used to indicate the second forwarding plane network element from the policy Determining, by the decision network element, a second service policy rule corresponding to the second DN connection, and performing policy control on the second DN connected message according to the second service policy rule; or
  • the indication receiving unit 1801 acquires the second service policy rule corresponding to the second DN connection from the policy decision network element, and the indication sending unit 1803 sends the second service policy rule to the second forwarding plane network element.
  • the second service policy rule is used to perform policy control on the packet of the second DN connection.
  • processing unit 1802 is specifically configured to:
  • processing unit 1802 is specifically configured to:
  • the indication sending unit 1803 sends a first policy control session establishment request message to the policy decision network element, where the first policy control session establishment request message carries the connection identifier of the first DN connection and the second DN connection. a connection identifier; the receiving unit 1801 receives the first service policy rule corresponding to the updated first DN connection sent by the policy decision network element according to the first policy control session establishment request message, and the second The second service policy rule corresponding to the DN connection; or,
  • the indication sending unit 1803 sends a second policy control session establishment request message to the policy decision network element, where the second policy control session establishment request message carries the connection identifier of the second DN connection; the indication receiving unit 1801 receives the The policy decision network element controls the second service policy rule corresponding to the second DN connection sent by the session establishment request message according to the second policy; the indication sending unit 1803 sends a policy control session request message to the policy decision network element, The policy control session request message carries the connection identifier of the first DN connection; the indication receiving unit 1801 receives the first DN connection that is sent by the policy decision network element according to the policy control session request message and is updated. Corresponding first business policy rule; or,
  • the indication sending unit 1803 sends a third policy control session establishment request message to the policy decision network element, where the third policy control session establishment request message carries the connection identifier of the first DN connection; the indication receiving unit 1801 receives the The policy decision network element controls the first service policy rule corresponding to the updated first DN connection sent by the session establishment request message according to the third policy; the indication sending unit 1803 sends the fourth policy to the policy decision network element.
  • Control session establishment request And the fourth policy control session establishment request message carries the connection identifier of the second DN connection; the indication receiving unit 1801 receives the information and the network information sent by the policy decision network element according to the fourth policy control session establishment request message.
  • the second service policy rule corresponding to the second DN connection.
  • the first service policy rule includes the indication identifier or the tunnel information, where the indication identifier or the tunnel information is used to indicate that the second forwarding plane network element is received from the first forwarding plane network element.
  • the downlink packet is detected by the IP quintuple in the tunnel.
  • processing unit 1802 is specifically configured to:
  • the indication sending unit 1803 sends a session establishment request message to the second forwarding plane network element, where the session establishment request message is used to indicate that the second forwarding plane network element establishes a relationship with the first forwarding plane network element.
  • a packet forwarding path corresponding to the first DN connection and indicating that the second forwarding plane network element establishes with the first DN between the base station serving the UE by using the control plane network element Connect the corresponding packet forwarding path; or,
  • the indication sending unit 1803 sends a first packet forwarding policy to the first forwarding plane network element, a second packet forwarding policy to the second forwarding network element, and a third packet to the base station serving the UE.
  • the first forwarding policy, the first packet forwarding policy, the second packet forwarding policy, and the third packet forwarding policy are used to establish the first forwarding plane network element corresponding to the first DN connection a packet forwarding path between the second forwarding plane network element and a packet forwarding path between the second forwarding plane network element and the base station.
  • the processing unit 1802 is further configured to:
  • the indication receiving unit 1801 receives the policy control session deletion request message sent by the policy decision network element, where the policy control session deletion request message is used to delete the policy control session between the control plane network element and the policy decision network element. ;
  • the network element deletes the third service policy rule corresponding to the first DN connection.
  • FIG. 19 is a structural diagram of another forwarding plane network element according to an embodiment of the present invention.
  • the forwarding plane network element is used to implement the function of a second forwarding plane network element in the policy control method provided by the embodiment of the present invention, where the UE has the A forwarding plane network element is a first DN connection of the anchor point, and the forwarding plane network element includes:
  • the processing unit 1901 is configured to update a forwarding path of the first DN connection, so that the updated location is
  • the forwarding path of the first DN connection is controlled by the second forwarding plane network element; and the updated message of the first DN connection is controlled.
  • the processing unit 1901 may specifically be the foregoing processor 1602.
  • the forwarding plane network element further includes a receiving unit 1902;
  • the receiving unit 1902 is configured to receive a message or an instruction sent by another network element.
  • the receiving unit 1902 can specifically receive through the foregoing communication interface 1603.
  • the processing unit 1901 is specifically configured to:
  • the receiving unit 1902 receives the session establishment request message or the redirect response message sent by the control plane network element, and obtains the updated first DN connection from the policy decision network element according to the session establishment request message or the redirect response message.
  • the first service policy rule performs policy control on the updated packet of the first DN connection according to the first service policy rule; or
  • the receiving unit 1902 receives the updated first service policy rule corresponding to the first DN connection sent by the control plane network element; and the updated first DN connection according to the first service policy rule The message is controlled by the policy.
  • the UE further has a second DN connection with the second forwarding plane network element as an anchor point
  • the processing unit 1901 is further configured to:
  • the receiving unit 1902 receives the session establishment request message or the redirect response message sent by the control plane network element, and acquires the second DN connection corresponding to the policy decision network element according to the session establishment request message or the redirect response message.
  • the second service policy rule is configured to perform policy control on the second DN connected packet according to the second service policy rule; or
  • the receiving unit 1902 receives the second service policy rule corresponding to the second DN connection sent by the control plane network element, and performs policy control on the second DN connected message according to the second service policy rule.
  • processing unit 1901 is specifically configured to:
  • the forwarding plane network element further includes a sending unit 1903;
  • the sending unit 1903 is configured to send a message or an instruction to another network element.
  • the sending unit 1903 may specifically send through the foregoing communication interface 1603;
  • the processing unit 1901 is specifically configured to:
  • the indication sending unit 1903 sends a first policy control session establishment request message to the policy decision network element, where the first policy control session establishment request message carries the connection identifier of the first DN connection and the second DN connection. a connection identifier; the receiving unit 1902 receives the first service policy rule corresponding to the updated first DN connection sent by the policy decision network element according to the first policy control session establishment request message, and the second The second service policy rule corresponding to the DN connection; or,
  • the indication sending unit 1903 sends a second policy control session establishment request message to the policy decision network element, where the second policy control session establishment request message carries the connection identifier of the second DN connection; the indication receiving unit 1902 receives the The policy decision network element controls the second service policy rule corresponding to the second DN connection sent by the session establishment request message according to the second policy; the indication sending unit 1903 sends a policy control session request message to the policy decision network element, The policy control session request message carries the connection identifier of the first DN connection; the indication receiving unit 1902 receives the first DN connection that is sent by the policy decision network element according to the policy control session request message and is updated. Corresponding first business policy rule; or,
  • the processing unit 1901 is specifically configured to:
  • the indication sending unit 1903 sends a third policy control session establishment request message to the policy decision network element, where the third policy control session establishment request message carries the connection identifier of the first DN connection; the indication receiving unit 1902 receives the The policy decision network element controls the first service policy rule corresponding to the updated first DN connection sent by the session establishment request message according to the third policy; the indication sending unit 1903 sends a fourth policy to the policy decision network element. Controlling a session establishment request message, where the fourth policy control session establishment request message carries the connection identifier of the second DN connection; the indication receiving unit 1902 receives the policy decision network element, and controls the session establishment request message according to the fourth policy. Sending a second service policy rule corresponding to the second DN connection.
  • processing unit 1901 is specifically configured to:
  • the indication receiving unit 1902 receives the session establishment request message sent by the control plane network element, and establishes, according to the session establishment request message, a packet forwarding path corresponding to the first DN connection between the first forwarding plane network element, And establishing, by the control plane network element, the service provided for the UE a packet forwarding path corresponding to the first DN connection between the base stations; or
  • the receiving unit 1902 receives the second packet forwarding policy sent by the control plane network element, so that the second forwarding plane network element according to the second packet forwarding policy and the first forwarding plane network element according to the slave a first packet forwarding policy that is received by the control plane network element, and a packet forwarding path between the first forwarding plane network element and the second forwarding plane network element corresponding to the first DN connection is established; And the base station serving the UE according to the second packet forwarding policy, according to the third packet forwarding policy received from the control plane network element, establishing the second forwarding corresponding to the first DN connection A packet forwarding path between the surface network element and the base station.
  • FIG. 20 is a structural diagram of another policy decision network element according to an embodiment of the present invention.
  • the policy decision network element is used to implement the function of the policy decision network element in the policy control method provided by the embodiment of the present invention, and the UE has the first forwarding
  • the surface network element is the first DN connection of the anchor point, and the policy decision network element includes:
  • the receiving unit 2001 is configured to receive a message or an instruction sent by another network element.
  • the receiving unit 2001 can be specifically received by using the foregoing communication interface 1703.
  • the sending unit 2002 is configured to send a message or an instruction to other network elements.
  • the sending unit 1903 can be specifically sent by using the foregoing communication interface 1703.
  • the processing unit 2003 is configured to instruct the receiving unit 2001 to receive the first policy control session establishment request message sent by the control plane network element or the second forwarding plane network element, where the first policy control session establishment request message carries the first DN Connection identifier of the connection;
  • the policy rule is used to perform policy control on the packet of the first DN connection.
  • processing unit 2003 is further configured to:
  • the first policy control session establishment request message further carries a connection identifier of the second DN connection, where the second DN connection is anchored by the second forwarding plane network element; and the session establishment request is controlled according to the first policy.
  • the message instructing the sending unit 2002 sends the second service policy rule corresponding to the second DN connection to the second forwarding plane network element or the control plane network element, where the second service policy rule is used for the second DN-connected packets are policy-controlled; or,
  • the receiving unit 2001 receives the second forwarding plane network element or the second policy control session establishment request message sent by the control plane network element, where the second policy control session establishment request message carries the second DN connection. a connection identifier; the second session control request message is sent to the second forwarding plane network element or the control plane network element to send a second service policy rule corresponding to the second DN connection, according to the second policy control session establishment request message, The second service policy rule is used to perform policy control on the packet of the second DN connection.
  • Unit 2003 is also used to:
  • the indication sending unit 2002 sends a policy control session deletion request message to the first forwarding plane network element or the control plane network element, where the policy control session deletion request message is used to delete the first forwarding plane network element and the The policy determines a policy control session between the network elements or deletes a policy control session between the control plane network element and the policy decision network element.
  • FIG. 21 is a structural diagram of a policy control system according to an embodiment of the present invention.
  • the system includes: a control plane network element 2101, a forwarding plane network element 2102, and a policy decision network element 2103.
  • the control plane network element 2101 and the forwarding plane The network element 2102 and the policy decision network element 2103 are used to implement the policy control method provided by the embodiment of the present invention.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

Abstract

本发明实施例涉及策略控制方法、网元、系统及存储介质，该方法包括：控制面网元为UE建立了以第一转发面网元为锚点的第一数据网络DN连接；当控制面网元接收到UE的切换通知消息，确定由第二转发面网元为UE服务时，或当控制面网元为UE建立以第二转发面网元为锚点的第二DN连接时，控制面网元更新第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元，由第二转发面网元对第一DN连接的报文进行策略控制。由上可见，本发明实施例提供的方案能够实现需要跨PDN连接控制的策略。

Description

策略控制方法、网元、系统及存储介质 技术领域
本发明涉及通信领域，尤其涉及策略控制方法、网元、系统及存储介质。
背景技术
演进分组系统(Evolved Packet System，EPS)分为接入网和核心网两部分，在非漫游场景下的系统架构如图1所示。它的无线接入网是演进的通用陆地无线接入网(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)，用于实现无线接入有关的功能。演进的分组核心网(Evolved Packet Core，EPC)关键逻辑网元包括移动性管理实体(Mobility Management Entity，MME)、服务网关(Serving Gateway，S-GW)、分组数据网络网关(Packet Data Network Gateway，P-GW)、归属用户服务器(Home Subscriber Server，HSS)。
MME主要完成信令面功能的处理，如用户的鉴权、切换、空闲状态终端的移动性管理、用户上下文以及承载管理等。HSS存储用户签约信息。S-GW既是一个用户面功能实体，完成分组数据的路由和转发，并作为3GPP系统内的一个数据锚点，终止E-UTRAN的接口，同时在一定地理区域下也是E-UTRAN切换场景下本地移动性管理的锚点。P-GW是连接外部数据网的网关，是3GPP接入网络和非3GPP接入网络之间的用户面锚点。用户设备(User Equipment,UE)可以通过连接到P-GW创建分组数据网络(Packet Data Network，PDN)连接来访问外部PDN。这些PDN可以是Internet、虚拟私有网络(Virtual Private Network，VPN)、IP多媒体业务(IP Multi-media Service，IMS)网络，或者由运营商提供的无线应用协议(Wireless Application Protocol，WAP)网络等。
在实际的网络部署中，逻辑网元S-GW和P-GW可以分离也可以合一。除个别情况(如漫游)外，逻辑网元S-GW和P-GW都是合一部署的。
在EPC架构下，由于用户设备的网络协议(Internet Protocol，IP)地址是由P-GW对外提供路由功能。因此当UE发生移动后，UE业务流的IP地址及上下行路径需要锚定在P-GW处，以保证IP的连续性。如图2所示。
这样就造成移动后UE的业务流的上行链路(Uplink，UL)及下行链路(Downlink，DL)路径较长，时延较长，导致用户体验质量不高。
现有的EPS系统支持多PDN接入，即UE可以通过多个P-GW或者一个P-GW同时接入到多个PDN，并且EPS支持UE可以通过多个P-GW同时接入同一个PDN。
图2a为UE发生移动后，多PDN连接的示意图。图中，转发面网元可以是EPC网络中的PGW或其它IP锚点。PDN连接1和PDN连接2为UE移动后的PDN连接，即UE移动之后，通过PDN连接1访问PDN网络，或者通过PDN连接2访问PDN网络。PDN连接3为新建的PDN连接。UE通过新建的PDN连接3来实现新业务的上下行路径的优化。
在转发面网元分布式部署的场景中，分布式移动性管理(Distributed mobility management，DMM)提出可以就近建立多个IP连接，也就是说建立多个PDN连接，从而就近选择不同的转发面网元，连接到同一个PDN网络中，实现路由路径的优化。
根据现有DMM技术方案，UE在建立多PDN连接后，由于每个PDN连接的锚点网关位置不同，而策略和计费功能执行点(policy and charging enforcement function，PCEF)位于锚点网关上，从而导致同一个UE具有多个策略和计费功能执行点，这会导致某些需要跨PDN连接控制的策略，如APN-AMBR、UE粒度计费策略无法实现。也就是说，UE与PDN之间建立多个PDN连接且这多个PDN连接通过不同的转发面网元接入PDN时，如何对用户报文进行多PDN连接粒度的策略控制，现有技术未给出解决方案。
发明内容
本发明实施例提供了一种策略控制方法、网元、系统及存储介质，以实现某些需要跨PDN连接控制的策略。
第一方面，提供了一种策略控制方法，控制面网元为UE建立了以第一转发面网元为锚点的第一数据网络(Data Network，DN)连接；当控制面网元接收到UE的切换通知消息，确定由第二转发面网元为UE服务时，或当控制面网元为UE建立以第二转发面网元为锚点的第二DN连接时，控制面网元更新第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元，由第二转发面网元对第一DN连接的报文进行策略控制。
本发明实施例中，通过转发路径迁移，控制面网元更新第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元，由第二转发面网元对第一DN连接的报文进行策略控制，以实现对UE的报文进行多PDN连接粒度的策略控制。
在一种可能的实施方式中，控制面网元更新第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元之后，控制面网元向第二转发面网元发送会话建立请求消息或重定向响应消息，会话建立请求消息或重定向响应消息用于指示第二转发面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则，根据第一业务策略规则对更新后的第一DN连接的报文进行策略控制；或者，控制面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则；控制面网元将第一业务策略规则发送给第二转发面网元，第一业务策略规则用于对更新后的第一DN连接的报文进行策略控制。
本发明实施例中，在通过转发路径迁移使第一DN连接的转发路径经过第二转发面网元之后，还要使第二转发面网元获取更新后的第一DN连接对应的第一业务策略规则，以便根据第一业务策略规则对更新后的第一DN连接的报文进行策略控制，即策略执行点位于距离UE较近的转发面网元上，当UE发起新的DN连接时，使得UE的所有DN连接经同一个转发面网元，从而对UE进行多DN连接粒度的策略控制。当策略控制会话存在于转发面网元和策略决策网元之间时，由控制面网元指示第二转发面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则。当策略控制会话存在于控制面网元和策略决策网元之间时，由控制面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则，将第一业务策略规则发送给第二转发面网元。
在一种可能的实施方式中，控制面网元向第二转发面网元发送会话建立请求消息或重定向响应消息，会话建立请求消息或重定向响应消息用于指示第二转发面网元从策略决策网元获取第二DN连接对应的第二业务策略规则，根据第二业务策略规则对第二DN连接的报文进行策略控制；或者控制面网元从策略决策网元获取第二DN连接对应的第二业务策略规则；控制面网元将第二业务策略规则发送给第二转发面网元，第二业务策略规则用于对第二DN连接的报文进行策略控制。
本发明实施例中，在建立第二DN连接的过程中，还要使第二转发面网元获取第二DN连接对应的第二业务策略规则，以便根据第二业务策略规则对第二DN连接的报文进行策略控制。
在一种可能的实施方式中，控制面网元建立与策略决策网元之间的一个策略控制会话，通过一个策略控制会话从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则以及第二DN连接对应的第二业务策略规则；或者，控制面网元建立与策略决策网元之间的两个策略控制会话，通过两个策略控制会话其中一个策略控制会话从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则，以及通过两个策略控制会话中的另一个策略控制会话获取第二DN连接对应的第二业务策略规则。
本发明实施例中，控制面网元通过与策略决策网元之间的一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。控制面网元通过与策略决策网元之间的一个策略控制会话获取一个连接对应的业务策略规则，可以灵活获取业务策略规则。
在一种可能的实施方式中，控制面网元向策略决策网元发送第一策略控制会话建立请求消息，第一策略控制会话建立请求消息中携带第一DN连接的连接标识和第二DN连接的连接标识；接收策略决策网元根据第一策略控制会话建立请求消息发送的与更新后的第一DN连接对应的第一业务策略规则和与第二DN连接对应的第二业务策略规则。
本发明实施例中，通过在一个策略控制会话建立请求消息中携带多个DN连接的连接标识，从而通过一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。
在一种可能的实施方式中，控制面网元向策略决策网元发送第二策略控制会话建立请求消息，第二策略控制会话建立请求消息中携带第二DN连接的连接标识；接收策略决策网元根据第二策略控制会话建立请求消息发送的与第二DN连接对应的第二业务策略规则；向策略决策网元发送策略控制会话请求消息，策略控制会话请求消息中携带第一DN连接的连接标识；接收策略决策网元根据策略控制会话请求消息发送的与更新后的第一DN连接对应的第一业务策略规则。
本发明实施例中，先通过策略控制会话建立请求消息中携带一个DN连 接的连接标识，然后通过策略控制会话请求消息中携带另一个DN连接的连接标识，从而通过一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。
在一种可能的实施方式中，控制面网元向策略决策网元发送第三策略控制会话建立请求消息，第三策略控制会话建立请求消息中携带第一DN连接的连接标识；接收策略决策网元根据第三策略控制会话建立请求消息发送的与更新后的第一DN连接对应的第一业务策略规则；向策略决策网元发送第四策略控制会话建立请求消息，第四策略控制会话建立请求消息中携带第二DN连接的连接标识；接收策略决策网元根据第四策略控制会话建立请求消息发送的与第二DN连接对应的第二业务策略规则。
本发明实施例中，控制面网面通过在一个策略控制会话建立请求消息中携带一个DN连接的连接标识，在另一个策略控制会话建立请求消息中携带另一个DN连接的连接标识，从而实现控制面网元通过与策略决策网元之间的一个策略控制会话获取一个连接对应的业务策略规则，可以灵活获取业务策略规则。
在一种可能的实施方式中，第一业务策略规则中包含指示标识或隧道信息，指示标识或隧道信息用于指示第二转发面网元对于从第一转发面网元接收到的下行报文按照隧道内IP五元组进行流检测。
本发明实施例中，由于第一业务策略规则为更新后的第一DN连接对应的业务策略规则，而更新后的第一DN连接经过第一转发面网元和第二转发面网元，因此通过第一业务策略规则中包含指示标识或隧道信息，指示第二转发面网元对于从第一转发面网元接收到的下行报文按照隧道内IP五元组进行流检测，从而正确的对下行报文进行策略控制。
在一种可能的实施方式中，控制面网元向第二转发面网元发送会话建立请求消息，会话建立请求消息用于指示第二转发面网元建立与第一转发面网元之间的与第一DN连接对应的报文转发路径，以及，指示第二转发面网元通过控制面网元建立与为UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径。
本发明实施例中，通过控制面网元向第二转发面网元发送会话建立请求消息的方式，指示第二转发面网元更新所述第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元，这种方式使得UE的 DN连接经过距离UE较近的转发面网元，当UE发起新的DN连接时，使得UE的所有DN连接经同一个转发面网元，从而对UE进行多DN连接粒度的策略控制。
在一种可能的实施方式中，控制面网元向第一转发面网元发送第一报文转发策略，向第二转发网元发送第二报文转发策略，向为UE提供服务的基站发送第三报文转发策略，第一报文转发策略、第二报文转发策略及第三报文转发策略用于建立与第一DN连接对应的第一转发面网元与第二转发面网元之间的报文转发路径及第二转发面网元与基站之间的报文转发路径。
本发明实施例中，通过控制面网元向第一转发面网元、第二转发面网元、为UE提供服务的基站发送报文转发策略的方式，更新第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元，这种方式使得UE的DN连接经过距离UE较近的转发面网元，当UE发起新的DN连接时，使得UE的所有DN连接经同一个转发面网元，从而对UE进行多DN连接粒度的策略控制。
在一种可能的实施方式中，控制面网元接收策略决策网元发送的策略控制会话删除请求消息，策略控制会话删除请求消息用于删除控制面网元与策略决策网元之间的策略控制会话；控制面网元根据接收到的策略控制会话删除请求消息向第一转发面网元发送业务策略规则删除请求消息，业务策略规则删除请求消息用于指示第一转发面网元删除第一DN连接对应的第三业务策略规则。
本发明实施例中，对于策略控制会话存在于控制面网元与策略决策网元之间的情形，控制面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则之后，还要删除控制面网元与策略决策网元之间的针对更新前的第一DN连接的策略控制会话；控制面网元根据接收到的策略控制会话删除请求消息向第一转发面网元发送业务策略规则删除请求消息，指示第一转发面网元删除第一DN连接对应的第三业务策略规则，从而使得一个DN连接只有一个策略执行点，并通过该策略执行点实现多DN连接粒度的策略控制
第二方面，提供了一种策略控制方法，UE具有以第一转发面网元为锚点的第一DN连接，第二转发面网元更新第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元；第二转发面网元对更新后的 第一DN连接的报文进行策略控制。
本发明实施例中，通过转发路径迁移，第二转发面网元更新第一DN连接的转发路径，使更新后的第一DN连接的转发路径经过第二转发面网元，由第二转发面网元对第一DN连接的报文进行策略控制，以实现对UE的报文进行多PDN连接粒度的策略控制。
在一种可能的实施方式中，第二转发面网元接收控制面网元发送的会话建立请求消息或重定向响应消息，根据会话建立请求消息或重定向响应消息从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则，根据第一业务策略规则对更新后的第一DN连接的报文进行策略控制。
本发明实施例中，当策略控制会话存在于转发面网元和策略决策网元之间时，第二转发面网元根据控制面网元的指示从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则，根据第一业务策略规则对更新后的第一DN连接的报文进行策略控制，即策略执行点位于距离UE较近的转发面网元上，当UE发起新的DN连接时，使得UE的所有DN连接经同一个转发面网元，从而对UE进行多DN连接粒度的策略控制。
在一种可能的实施方式中，第二转发面网元接收控制面网元发送的更新后的第一DN连接对应的第一业务策略规则；第二转发面网元根据第一业务策略规则对更新后的第一DN连接的报文进行策略控制。
本发明实施例中，当策略控制会话存在于控制面网元和策略决策网元之间时，第二转发面网元接收控制面网元发送的第一业务策略规则，该第一业务策略规则为控制面网元从策略决策网元获取的更新后的第一DN连接对应的业务策略规则，第二转发面网元根据第一业务策略规则对更新后的第一DN连接的报文进行策略控制,即策略执行点位于距离UE较近的转发面网元上，当UE发起新的DN连接时，使得UE的所有DN连接经同一个转发面网元，从而对UE进行多DN连接粒度的策略控制。
在一种可能的实施方式中，所述UE还具有以第二转发面网元为锚点的第二DN连接，第二转发面网元接收控制面网元发送的会话建立请求消息或重定向响应消息，根据会话建立请求消息或重定向响应消息从策略决策网元获取第二DN连接对应的第二业务策略规则，根据第二业务策略规则对第二DN连接的报文进行策略控制。
本发明实施例中，当策略控制会话存在于转发面网元和策略决策网元之 间时，第二转发面网元根据控制面网元的指示，从策略决策网元获取第二DN连接对应的第二业务策略规则，以便根据第二业务策略规则对第二DN连接的报文进行策略控制。
在一种可能的实施方式中，第二转发面网元接收控制面网元发送的第二DN连接对应的第二业务策略规则；第二转发面网元根据第二业务策略规则对第二DN连接的报文进行策略控制。
本发明实施例中，当策略控制会话存在于控制面网元和策略决策网元之间时，第二转发面网元接收控制面网元发送的第二DN连接对应的第二业务策略规则，该第二业务策略规则为控制面网元从策略决策网元获取第二DN连接对应的第二业务策略规则，以便根据第二业务策略规则对第二DN连接的报文进行策略控制。
在一种可能的实施方式中，第二转发面网元建立与策略决策网元之间的一个策略控制会话，通过一个策略控制会话从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则以及第二DN连接对应的第二业务策略规则。
本发明实施例中，转发面网元通过与策略决策网元之间的一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。
在一种可能的实施方式中，第二转发面网元建立与策略决策网元之间的两个策略控制会话，通过两个策略控制会话其中一个策略控制会话从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则，以及通过两个策略控制会话中的另一个策略控制会话获取第二DN连接对应的第二业务策略规则。
本发明实施例中，转发面网元通过与策略决策网元之间的一个策略控制会话获取一个连接对应的业务策略规则，可以灵活获取多个连接对应的业务策略规则。
在一种可能的实施方式中，第二转发面网元向策略决策网元发送第一策略控制会话建立请求消息，第一策略控制会话建立请求消息中携带第一DN连接的连接标识和第二DN连接的连接标识；接收策略决策网元根据第一策略控制会话建立请求消息发送的与更新后的第一DN连接对应的第一业务策略规则和与第二DN连接对应的第二业务策略规则。
本发明实施例中，通过在一个策略控制会话建立请求消息中携带多个DN连接的连接标识，从而通过一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。
在一种可能的实施方式中，第二转发面网元向策略决策网元发送第二策略控制会话建立请求消息，第二策略控制会话建立请求消息中携带第二DN连接的连接标识；接收策略决策网元根据第二策略控制会话建立请求消息发送的与第二DN连接对应的第二业务策略规则；向策略决策网元发送策略控制会话请求消息，策略控制会话请求消息中携带第一DN连接的连接标识；接收策略决策网元根据策略控制会话请求消息发送的与更新后的第一DN连接对应的第一业务策略规则。
本发明实施例中，先通过策略控制会话建立请求消息中携带一个DN连接的连接标识，然后通过策略控制会话请求消息中携带另一个DN连接的连接标识，从而通过一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。
在一种可能的实施方式中，第二转发面网元向策略决策网元发送第三策略控制会话建立请求消息，第三策略控制会话建立请求消息中携带第一DN连接的连接标识；接收策略决策网元根据第三策略控制会话建立请求消息发送的与更新后的第一DN连接对应的第一业务策略规则；向策略决策网元发送第四策略控制会话建立请求消息，第四策略控制会话建立请求消息中携带第二DN连接的连接标识；接收策略决策网元根据第四策略控制会话建立请求消息发送的与第二DN连接对应的第二业务策略规则。
本发明实施例中，转发面网面通过在一个策略控制会话建立请求消息中携带一个DN连接的连接标识，在另一个策略控制会话建立请求消息中携带另一个DN连接的连接标识，从而实现转发面网元通过与策略决策网元之间的一个策略控制会话获取一个连接对应的业务策略规则，可以灵活获取多个连接对应的业务策略规则。
在一种可能的实施方式中，第二转发面网元接收控制面网元发送的会话建立请求消息，根据会话建立请求消息建立与第一转发面网元之间的与第一DN连接对应的报文转发路径，以及，通过控制面网元建立与为UE提供服务的基站之间的与第一DN连接对应的报文转发路径。
本发明实施例中，转发面网元根据控制面网元的指示更新第一DN连接 对应的报文转发路径，从而实现转发路径迁移，这种方式使得UE的DN连接经过距离UE较近的转发面网元，当UE发起新的DN连接时，使得UE的所有DN连接经同一个转发面网元，从而对UE进行多DN连接粒度的策略控制。
在一种可能的实施方式中，第二转发面网元接收控制面网元发送的第二报文转发策略，以使第二转发面网元根据第二报文转发策略、第一转发面网元根据从控制面网元接收的第一报文转发策略，建立与第一DN连接对应的第一转发面网元与第二转发面网元之间的报文转发路径；第二转发面网元根据第二报文转发策略、为UE提供服务的基站根据从控制面网元接收的第三报文转发策略，建立与第一DN连接对应的第二转发面网元与基站之间的报文转发路径。
本发明实施例中，转发面网元根据控制面网元发送的报文转发策略更新第一DN连接对应的报文转发路径，从而实现转发路径迁移，这种方式使得UE的DN连接经过距离UE较近的转发面网元，当UE发起新的DN连接时，使得UE的所有DN连接经同一个转发面网元，从而对UE进行多DN连接粒度的策略控制。
在一种可能的实施方式中，第二转发面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则之后，第一转发面网元接收策略决策网元发送的策略控制会话删除请求消息，策略控制会话删除请求消息用于删除第一转发面网元与策略决策网元之间的策略控制会话，第一转发面网元根据策略控制会话删除请求消息删除第一DN连接对应的第三业务策略规则。
本发明实施例中，当策略控制会话存在于转发面网元与策略决策网元之间时，第二转发面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则之后，第一转发面网元根据策略决策网元的指示删除更新前的第一DN连接对应的策略控制会话以及更新前的第一DN连接对应的业务策略规则。
在一种可能的实施方式中，第二转发面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则之后，第一转发面网元接收控制面网元发送的业务策略规则删除请求消息，业务策略规则删除请求消息用于指示第一转发面网元删除第一DN连接对应的第三业务策略规则，第一转发面网元根据业务策略规则删除请求消息删除第一DN连接对应的第三业务策略规则。
本发明实施例中，当策略控制会话存在于控制面网元与策略决策网元之间时，第二转发面网元从策略决策网元获取更新后的第一DN连接对应的第一业务策略规则之后，第一转发面网元根据控制面网元的指示删除更新前的第一DN连接对应的业务策略规则。
第三方面，提供了一种策略控制方法，UE具有以第一转发面网元为锚点的第一数据网络DN连接，策略决策网元接收控制面网元或第二转发面网元发送的第一策略控制会话建立请求消息，第一策略控制会话建立请求消息中携带第一DN连接的连接标识；策略决策网元根据第一策略控制会话建立请求消息向第二转发面网元或控制面网元发送与第一DN连接对应的第一业务策略规则，第一业务策略规则用于对第一DN连接的报文进行策略控制。
本发明实施例中，策略决策网元向第二转发面网元或控制面网元发送更新后的第一DN连接对应的第一业务策略规则，以便第二转发面网元根据第一业务策略规则对更新后的第一DN连接的报文进行策略控制。
在一种可能的实施方式中，第一策略控制会话建立请求消息中还携带第二DN连接的连接标识，第二DN连接以第二转发面网元为锚点；策略决策网元根据第一策略控制会话建立请求消息向第二转发面网元或控制面网元发送第二DN连接对应的第二业务策略规则，第二业务策略规则用于对第二DN连接的报文进行策略控制。
本发明实施例中，策略决策网元通过与控制面网元或转发面网元之间的一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。
在一种可能的实施方式中，策略决策网元接收第二转发面网元或者控制面网元发送的策略控制会话请求消息，策略控制会话请求消息中携带第二DN连接标识；根据策略控制会话请求消息向第二转发面网元或者控制面网元发送与第二DN连接对应的第二业务策略队则，第二业务策略规则用于对所第二DN连接的报文进行策略控制。
本发明实施例中，先通过策略控制会话建立请求消息中携带一个DN连接的连接标识，然后通过策略控制会话请求消息中携带另一个DN连接的连接标识，从而通过一个策略控制会话获取多个连接对应的业务策略规则，可以减少维护策略控制会话引起的信令开销，节省信道传输资源。
在一种可能的实施方式中，策略决策网元接收第二转发面网元或者控制 面网元发送的第二策略控制会话建立请求消息，第二策略控制会话建立请求消息中携带第二DN连接的连接标识；根据第二策略控制会话建立请求消息向第二转发面网元或者控制面网元发送与第二DN连接对应的第二业务策略规则，第二业务策略规则用于对所述第二DN连接的报文进行策略控制。
本发明实施例中，通过在一个策略控制会话建立请求消息中携带一个DN连接的连接标识，在另一个策略控制会话建立请求消息中携带另一个DN连接的连接标识，从而实现策略决策网元通过与控制面网元或转发面网元之间的一个策略控制会话获取一个连接对应的业务策略规则，可以灵活获取多个连接对应的业务策略规则。
在一种可能的实施方式中，策略决策网元根据第一策略控制会话建立请求消息向第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则之后，策略决策网元向第一转发面网元或者控制面网元发送策略控制会话删除请求消息，策略控制会话删除请求消息用于删除第一转发面网元与策略决策网元之间的策略控制会话或者删除控制面网元与策略决策网元之间的策略控制会话。
本发明实施例中，策略决策网元向第一转发面网元或者控制面网元发送策略控制会话删除请求消息，策略控制会话删除请求消息用于删除第一转发面网元与策略决策网元之间的策略控制会话或者删除控制面网元与策略决策网元之间的策略控制会话，以及指示第一转发面网元删除第一DN连接对应的第三业务策略规则，从而使得一个DN连接只有一个策略执行点，并通过该策略执行点实现多DN连接粒度的策略控制。
又一方面，本发明实施例提供了一种控制面网元，该控制面网元可以实现上述方法示例中控制面网元所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。
在一种可能的设计中，该控制面网元的结构中包括处理器和通信接口，该处理器被配置为支持该控制面网元执行上述方法中相应的功能。该通信接口用于支持该控制面网元与其他网元之间的通信。该控制面网元还可以包括存储器，该存储器用于与处理器耦合，其保存该控制面网元必要的程序指令和数据。
又一方面，本发明实施例提供了一种转发面网元，该转发面网元可以实 现上述方法实施例中转发面网元所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。
在一种可能的设计中，该转发面网元的结构中包括处理器和通信接口，该处理器被配置为支持该转发面网元执行上述方法中相应的功能。该通信接口用于支持该转发面网元与其他网元之间的通信。该转发面网元还可以包括存储器，该存储器用于与处理器耦合，其保存该转发面网元必要的程序指令和数据。
又一方面，本发明实施例提供了一种策略决策网元，该策略决策网元可以实现上述方法实施例中策略决策网元所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。
在一种可能的设计中，该策略决策网元的结构中包括处理器和通信接口，该处理器被配置为支持该策略决策网元执行上述方法中相应的功能。该通信接口用于支持该策略决策网元与其他网元之间的通信。该策略决策网元还可以包括存储器，该存储器用于与处理器耦合，其保存该策略决策网元必要的程序指令和数据。
又一方面，本发明实施例提供了一种策略控制系统，该系统包括上述方面所述的控制面网元、转发面网元和策略决策网元。
再一方面，本发明实施例提供了一种计算机存储介质，用于储存为上述控制面网元所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
再一方面，本发明实施例提供了一种计算机存储介质，用于储存为上述转发面网元所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
再一方面，本发明实施例提供了一种计算机存储介质，用于储存为上述策略决策网元所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
相较于现有技术，本发明实施例提供的方案中，具体提供了一种多连接场景下的策略控制方法，在用户移动切换过程中，确定由新的转发面网元为UE服务时，控制面网元通过策略控制会话的迁移，以使用户报文经过最新的转发面网元，并通过该转发面网元对用户报文进行策略控制；或者在PDN连接建立过程中，通过策略控制会话和/或转发路径的迁移，以使所有PDN连接 上的用户报文经过相同的转发面网元，并通过该转发面网元执行策略控制。通过本发明方案，可以避免由于用户报文路径的分散，导致无法针对UE的所有PDN连接进行策略控制。
附图说明
图1为EPC系统的系统架构示意图；
图2为图1所示的系统架构下UE发生移动后的路径示意图；
图2a为UE发生移动后多PDN连接的示意图；
图3为实现本发明的一种可能的系统架构示意图；
图4为实现本发明的另一种可能的系统架构示意图；
图5为本发明实施例提供的一种应用场景示意图；
图6为本发明实施例提供的另一种应用场景示意图；
图7为本发明实施例一提供的策略控制方法信号流图；
图8为本发明实施例二提供的策略控制方法信号流图；
图9为本发明实施例三提供的策略控制方法信号流图；
图10为本发明实施例四提供的策略控制方法信号流图；
图11为本发明实施例五提供的策略控制方法信号流图；
图12为本发明实施例六提供的策略控制方法信号流图；
图13为本发明实施例七提供的策略控制方法信号流图；
图14为本发明实施例八提供的策略控制方法信号流图；
图15为本发明实施例提供的一种控制面网元结构图；
图16为本发明实施例提供的一种转发面网元结构图；
图17为本发明实施例提供的一种策略决策网元结构图；
图18为本发明实施例提供的另一种控制面网元结构图；
图19为本发明实施例提供的另一种转发面网元结构图；
图20为本发明实施例提供的另一种策略决策网元结构图；
图21为本发明实施例提供的一种策略控制系统结构图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述。
本发明实施例描述的网络架构以及业务场景是为了更加清楚的说明本发明实施例的技术方案，并不构成对本发明实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本发明实施例提供的技术方案对于类似的技术问题，同样适用。
图3为实现本发明的一种可能的系统架构示意图。该系统中主要包括如下网元：UE、接入网(Access Network，AN)、控制面网元、转发面网元和策略决策网元。UE指网络终端设备，包括但不限于手机、网络接入终端设备、物联网终端设备等。AN指为终端设备提供无线接入的设备，包括但不限于演进型基站(eNodeB)、无线保真(WIreless-Fidelity，WiFi)的接入点(Access Point，AP)、第五代移动通信技术(5th-Generation，5G)的接入网(Access Network，AN)/基站(Base Station，BS)、全球微波互联接入(Worldwide Interoperability for Microwave Access，WiMAX)的BS等。控制面网元，指负责移动网络中移动性管理和/或转发路径管理的网元，如移动性管理实体(Mobility Management Entity，MME)、网关控制器(GateWay controller，GW-C)、软件定义网络(Software Define Network，SDN)控制器(controller)或以上网元的全部或部分功能融合后形成的移动网关控制器。转发面网元，指为用户提供业务报文转发的网元，可以为EPC网络中的PDN-GW或PDN-GW转发面或路由器、交换机、SDN switch等物理或虚拟的转发设备。策略决策网元，负责对移动网络进行策略控制和/或计费控制，可以是EPC网络中的PCRF。
在图3所示的系统架构中，策略控制会话位于转发面网元与策略决策网元之间。
图4为实现本发明的另一种可能的系统架构示意图。图4所示的系统架构和图3所示的系统架构的区别在于，图3所示的系统架构图中策略控制会话位于转发面网元与策略决策网元之间；图4所示的系统架构图中策略控制会话位于控制面网元与策略决策网元之间。
在图3和图4所示的系统架构图中，DN(Data Network，数据网络)用于为用户提供数据传输服务，可以是Internet，IMS(IP Multimedia Subsystem，IP多媒体子系统)，企业网等。UE建立与DN网络之间的会话连接，称之为DN连接。所述DN连接，具体的可以是PDN(Packet Data Network，分组数据网络)连接。
在图3和图4中，所述策略控制会话，是指控制面网元或转发面网元与策略决策网元之间的信令连接，用于控制面网元或转发面网元确定DN连接对应的业务策略规则。
图5为本发明实施例提供的一种应用场景示意图，该场景基于图3所示的系统架构。其中，控制面网元与BS和转发面网元之间可以建立通信连接，策略决策网元和转发面网元之间可以建立策略控制会话。图5中仅示出控制面网元与BS1之间的通信连接，以及控制面网元和转发面网元1之间的通信连接，以及策略决策网元和转发面网元1之间的策略控制会话。图6为本发明实施例提供的另一种应用场景示意图，该场景基于图4所示的系统架构。其中，控制面网元与BS和转发面网元之间可以建立通信连接，策略决策网元和控制面网元之间可以建立策略控制会话。图6中仅示出控制面网元与BS1之间的通信连接，以及控制面网元和转发面网元1之间的通信连接。参照图5和图6，UE在移动(move)过程中，发生切换。例如，当UE沿着图中箭头的方向移动时，从BS1切换到BS2，通过DN连接1或DN连接2访问DN。另外，当UE发起新的业务时，UE还可以与DN之间建立新的DN连接，以实现UE新业务路由的优化。例如，UE位于BS2时，发起新的DN连接建立过程，通过DN连接3访问DN。
如图5和图6所示，所述DN连接1以转发面网元1为锚点；DN连接2以转发面网元1为锚点，转发路径经过转发面网元2和转发面网元1；DN连接3以转发面网元2为锚点。
本发明的基本思路为，在用户移动切换过程中，确定由新的转发面网元为UE服务时，控制面网元通过策略控制会话的迁移，以使用户报文经过新的转发面网元，并通过该转发面网元对用户报文进行策略控制；或者在DN连接建立过程中，通过策略控制会话和/或转发路径的迁移，以使所有DN连接上的用户报文经过相同的转发面网元，并通过该转发面网元对用户报文进行策略控制。
其中，所述策略控制会话，是指控制面网元或转发面网元与策略决策网元之间的信令连接，用于控制面网元或转发面网元确定DN连接对应的业务策略规则。所述转发路径迁移，是指更新UE的转发路径，以使UE的所有DN连接经过同一个转发面网元，并通过该转发面网元对用户报文执行多DN连接粒度的策略控制。例如图5a所示，当UE移动发生切换后，通过DN连 接1接入DN网络，而UE的新建DN连接通过DN连接3接入DN网络，此时UE具有2个策略执行点，即转发面网元1对DN连接1上的用户报文进行策略控制，转发面网元2对DN连接2上的用户报文进行策略控制，且DN连接1不经过转发面网元2则通过转发路径迁移，将BS2与转发面网元1之间的转发路径进行迁移到BS2与转发面网元2、及转发面网元2与转发面网元1之间。
首先，通过下面四个实施例对本发明提供的策略控制方法进行总体的说明。
实施例一
图7为本发明实施例提供的一种策略控制方法信号流图，该方法主要涉及的执行主体包括：UE、BS、控制面网元、第一转发面网元、第二转发面网元和策略决策网元。其中，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接，当控制面网元接收到UE的切换通知消息，确定由第二转发面网元为UE服务时，更新转发路径，并进行策略控制会话迁移。本实施例针对图4所示的系统架构和图6所示的应用场景，即策略控制会话位于控制面网元与策略决策网元之间。图7中的UE移动前接入的BS(源BS)即为图6中的BS1，UE移动后接入的BS(目标BS)为图6中的BS2，第一转发面网元为图6中的转发面网元1，第二转发面网元为图6中的转发面网元2。具体的场景描述为：UE位于源BS的覆盖下时，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接；UE移动切换到目标BS下时，更新第一DN连接的转发路径，使其通过图6所示的DN连接2接入DN。由此场景触发的策略控制会话的迁移过程，具体过程参照图7，该方法包括：
步骤400，UE发生移动，从源BS切换到目标BS下。步骤401，控制面网元接收目标BS的切换通知消息。
步骤402，控制面网元确定由第二转发面网元为UE服务。
步骤403，控制面网元更新第一DN连接的转发路径，使第一DN连接的转发路径经过第二转发面网元。
在一个示例中，步骤403具体可以包括：控制面网元向第一转发面网元发送第一报文转发策略，向第二转发网元发送第二报文转发策略，向为UE提供服务的基站发送第三报文转发策略，所述第一报文转发策略、所述第二报文转发策略及所述第三报文转发策略用于建立与所述第一DN连接对应的所 述第一转发面网元与所述第二转发面网元之间的报文转发路径及所述第二转发面网元与所述基站之间的报文转发路径。
在步骤403之后，该方法还包括第二转发面网元确定第一DN连接对应的第一业务策略规则的过程。其中，第一业务策略规则包含指示标识或隧道信息，所述指示标识或隧道信息用于指示第二转发面网元对于从第一转发面网元接收到的下行报文按照隧道内网络协议IP五元组进行流检测。所述第二转发面网元确定第一DN连接对应的第一业务策略规则的过程可由如下步骤404至406实现：
步骤404，控制面网元向策略决策网元发送第一策略控制会话建立请求消息，第一策略控制会话建立请求消息中携带第一DN连接的连接标识。
其中，上述第一策略控制会话建立请求消息中还可以携带第二转发面网元的标识，用于指示策略决策网元确定该第一DN连接的策略执行点位于第二转发面网元。
步骤405，策略决策网元根据第一策略控制会话建立请求消息，确定与第一DN连接对应的第一业务策略规则，向控制面网元发送第一策略控制会话建立应答消息，携带所述第一业务策略规则。所述第一业务策略规则，用于指示第二转发面网元根据第一业务策略规则对第一DN连接的报文进行策略控制。
步骤406，控制面网元将第一业务策略规则发送给第二转发面网元。
所述第一业务策略规则用于指示第二转发面网元对第一DN连接的报文进行策略控制。
需要说明的是，步骤403与步骤404-405之间没有严格的先后执行顺序。当步骤404-405发生在步骤403之前时，步骤406所述的控制面网元向第二转发面网元发送第一业务策略规则可以与步骤403合并，即步骤403中，控制面网元向第二转发面网元发送第二报文转发策略时，还携带所述第一业务策略规则。
此外，由于本发明实施例中UE移动切换后还可能建立以第二转发面网元为锚点的第二DN连接(与图6中的DN连接3对应)，为方便描述，将控制面网元与策略决策网元之间的多个策略控制会话中，与转发路径更新后的第一DN连接对应的信令连接称为第一策略控制会话，所述第一策略控制会话用于确定与所述转发路径更新后的第一DN连接对应的业务策略规则，该业 务策略规则称为第一业务策略规则；将控制面网元与策略决策网元之间的多个策略控制会话中，与第二DN连接对应的信令连接称为第二策略控制会话，所述第二策略控制会话用于确定与第二DN连接对应的业务策略规则，该业务策略规则称为第二业务策略规则；将控制面网元与策略决策网元之间的多个策略控制会话中，与转发路径更新前的第一DN连接对应的信令连接称为第三策略控制会话，所述第三策略控制会话用于确定与所述转发路径更新前的第一DN连接对应的业务策略规则，该业务策略规则称为第三业务策略规则。
本发明实施例还包括使第一转发面网元删除第一DN连接对应的第三业务策略规则的过程，具体可由如下步骤407和408实现：
步骤407，策略决策网元向控制面网元发送策略控制会话删除请求消息，策略控制会话删除请求消息用于删除控制面网元与策略决策网元之间的第三策略控制会话。
步骤408，控制面网元向第一转发面网元发送业务策略规则删除请求，指示第一转发面网元删除第一DN连接对应的第三业务策略规则。
可选的，第一转发面网元向控制面网元发送业务策略规则删除响应消息。
步骤409，控制面网元向策略决策网元发送策略控制会话删除应答消息。
需要说明的是，步骤407可以发生在步骤404之后的任一步骤。
实施例二
图8为本发明实施例提供的另一种策略控制方法信号流图，该方法主要涉及的执行主体包括：UE、BS、控制面网元、第一转发面网元、第二转发面网元和策略决策网元。其中，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接，当控制面网元为UE建立以第二转发面网元为锚点的第二DN连接时，进行策略控制会话和转发路径的迁移。本实施例针对图4所示的系统架构和图6所示的应用场景，即策略控制会话位于控制面网元与策略决策网元之间。图8中的源BS即为图6中的BS1，目标BS为图6中的BS2，第一转发面网元为图6中的转发面网元1，第二转发面网元为图6中的转发面网元2。具体的场景描述为：UE位于源BS下时，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接；UE移动切换到目标BS下时，更新第一DN连接的转发路径，使其通过图6所示的DN连接1或DN连接2接入 DN。由此场景触发的策略控制会话的迁移过程和/或转发路径的迁移过程(当UE移动切换到目标BS下，通过图6所示的DN连接1接入DN时，涉及到转发路径的迁移过程)，具体过程参照图8，该方法包括：
步骤411，UE发起第二DN连接建立过程，通过BS向控制面网元发送DN连接建立请求。
步骤412，控制面网元确定第二转发面网元为UE服务。
步骤413，控制面网元更新第一DN连接的转发路径，使第一DN连接的转发路径经过第二转发面网元；
同时，控制面网元还可以建立第二DN连接的转发路径。
在一个示例中，步骤413具体可以包括：控制面网元向第一转发面网元发送第一报文转发策略，向第二转发网元发送第二报文转发策略，向为UE提供服务的基站发送第三报文转发策略，所述第一报文转发策略、所述第二报文转发策略及所述第三报文转发策略用于建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径及所述第二转发面网元与所述基站之间的报文转发路径。同时，控制面网元还可以向第二转发面网元发送第四报文转发策略，向为UE提供服务的基站发送第五报文转发策略，建立与所述第二DN连接对应的所述基站与所述第二转发面网元之间的报文转发路径。
在步骤413之后，该方法还包括第二转发面网元确定第一DN连接对应的第一业务策略规则及第二DN连接对应的第二业务策略规则的过程。其中，第一业务策略规则包含指示标识或隧道信息，所述指示标识或隧道信息用于指示第二转发面网元对于从第一转发面网元接收到的下行报文按照隧道内网络协议IP五元组进行流检测。该过程可由如下步骤414至418实现：
为方便描述，本实施例将控制面网元与策略决策网元之间的多个策略控制会话中，与转发路径更新后的第一DN连接对应的信令连接称为第一策略控制会话，所述第一策略控制会话用于确定与所述转发路径更新后的第一DN连接对应的业务策略规则，该业务策略规则称为第一业务策略规则；将控制面网元与策略决策网元之间的多个策略控制会话中，与第二DN连接对应的信令连接称为第二策略控制会话，所述第二策略控制会话用于确定与第二DN连接对应的业务策略规则，该业务策略规则称为第二业务策略规则；将控制面网元与策略决策网元之间的多个策略控制会话中，与转发路径更新前的第 一DN连接对应的信令连接称为第三策略控制会话，所述第三策略控制会话用于确定与第一DN连接对应的业务策略规则，该业务策略规则称为第三业务策略规则。
步骤414，控制面网元向策略决策网元发送第一策略控制会话建立请求消息，第一策略控制会话建立请求消息中携带第一DN连接的连接标识。
其中，上述第一策略控制会话建立请求消息中还可以携带第二转发面网元的标识，用于指示策略决策网元确定该第一DN连接的策略执行点位于第二转发面网元。
步骤415，策略决策网元根据第一策略控制会话建立请求消息，确定与第一DN连接对应的第一业务策略规则，向控制面网元发送第一策略控制会话建立应答消息，携带所述第一业务策略规则。所述第一业务策略规则，用于指示第二转发面网元根据第一业务策略规则对第一DN连接的报文进行策略控制。
步骤416，控制面网元向策略决策网元发送第二策略控制会话建立请求消息，第二策略控制会话建立请求消息中携带第二DN连接的连接标识。
步骤417，策略决策网元根据第一策略控制会话建立请求消息，确定与第二DN连接对应的第二业务策略规则，向控制面网元发送第二策略控制会话建立应答消息，携带所述第二业务策略规则。所述第二业务策略规则，用于指示第二转发面网元根据第二业务策略规则对第二DN连接的报文进行策略控制。
步骤418，控制面网元将所述第一业务策略规则及所述第二业务策略规则发送给第二转发面网元。
需要说明的是，步骤414-415与步骤416-417之间没有严格的先后执行顺序。另外，步骤413与步骤414-417之间也没有严格的先后执行顺序。当步骤414-417发生在步骤413之前时，步骤418所述的控制面网元向第二转发面网元发送第一业务策略规则及第二业务策略规则可以与步骤413合并，即步骤413中，控制面网元向第二转发面网元发送第二报文转发策略时还携带所述第一业务策略规则，向第二转发面网元发送第四报文转发策略时还携带所述第二业务策略规则。
本发明实施例还包括第一转发面网元删除第一DN连接对应的第三业务策略规则的过程，具体可由如下步骤419至421实现：
步骤419，策略决策网元向控制面网元发送策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除控制面网元与策略决策网元之间的第三策略控制会话。
步骤420，控制面网元向第一转发面网元发送业务策略规则删除请求，指示第一转发面网元删除第一DN连接对应的第三业务策略规则。
可选的，第一转发面网元向控制面网元发送业务策略规则删除响应消息。
步骤421，控制面网元向策略决策网元发送策略控制会话删除应答消息。
需要说明的是，步骤419可以发生在步骤414之后的任一步骤。
步骤422，控制面网元通过BS向UE发送DN连接建立响应。
需要说明的另外一点是，所述控制面网元从策略决策网元获取与转发路径更新后的第一DN连接对应的第一业务策略规则和与第二DN连接对应的第二业务策略规则，包括2种方法：控制面网元建立与策略决策网元之间的一个策略控制会话，通过该策略控制会话从策略决策网元获取第一DN连接对应的第一业务策略规则，以及通过该策略控制会话获取第二DN连接对应的第二业务策略规则；或者，控制面网元建立与策略决策网元之间的两个策略控制会话，通过其中一个策略控制会话从策略决策网元获取第一DN连接对应的第一业务策略规则，以及通过另一个策略控制会话获取第二DN连接对应的第二业务策略规则。
本发明实施例中，图8描述的是第二种方式，即控制面网元与策略决策网元之间建立两个策略控制会话，通过其中一个策略控制会话获取第一DN连接对应的第一业务策略规则，通过另一个策略控制会话获取第二DN连接对应的第二业务策略规则。
对于第一种方式，即控制面网元与策略决策网元之间只有一个策略控制会话时，可将图8所述的信号流图中的步骤414-417替换为如下的处理过程：控制面网元向策略决策网元发送策略控制会话建立请求，携带第一DN连接标识和第二DN连接标识。策略决策网元根据接收到的策略控制会话建立请求，确定第一DN连接对应的第一业务策略规则及第二DN连接对应的第二业务策略规则，并向控制面网元发送策略控制会话建立应答消息，携带所述第一业务策略规则和所述第二业务策略规则。
或者，控制面网元向策略决策网元发送策略控制会话建立请求，携带第二DN连接标识。策略决策网元确定第二DN连接对应的第二业务策略规则， 并向控制面网元发送策略控制会话建立响应消息，携带所述第二业务策略规则。
控制面网元向策略决策网元发送策略控制会话请求消息，携带第一DN连接标识。
策略决策网元确定第一DN连接对应的第一业务策略规则，并向控制面网元发送策略控制会话响应消息，携带所述第一业务策略规则。
或者，控制面网元向策略决策网元发送策略控制会话建立请求，携带第二DN连接标识。策略决策网元确定第一DN连接对应的第一业务策略规则，并向控制面网元发送策略控制会话建立响应消息，携带所述第一业务策略规则。
控制面网元向策略决策网元发送策略控制会话请求消息，携带第二DN连接标识。
策略决策网元确定第二DN连接对应的第二业务策略规则，并向控制面网元发送策略控制会话响应消息，携带所述第二业务策略规则。
实施例三
图9为本发明实施例提供的另一种策略控制方法信号流图，该方法主要涉及的执行主体包括：UE、BS、控制面网元、第一转发面网元、第二转发面网元和策略决策网元。其中，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接，当控制面网元接收到UE的切换通知消息，确定由第二转发面网元为UE服务时，更新转发路径，并进行策略控制会话迁移。本实施例针对图3所示的系统架构和图5所示的应用场景，策略控制会话位于转发面网元与策略决策网元之间。图9中的源BS即为图5中的BS1，目标BS为图5中的BS2，第一转发面网元为图5中的转发面网元1，第二转发面网元为图5中的转发面网元2。具体的场景描述为：UE位于源BS下时，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接；UE移动切换到目标BS下时，更新第一DN连接的转发路径，使其通过图5所示的DN连接2接入DN。由此场景触发的策略控制会话的迁移过程，具体过程参照图9，该方法包括：
步骤420，UE发生移动，从源BS切换到目标BS下。
步骤421，控制面网元接收目标BS的切换通知消息。
步骤422，控制面网元确定由第二转发面网元为UE服务。
步骤423，控制面网元更新第一DN连接的转发路径，使第一DN连接的转发路径经过第二转发面网元。
在一个示例中，步骤423具体可以包括：控制面网元向第二转发面网元发送会话建立请求消息，会话建立请求消息用于指示第二转发面网元建立与第一转发面网元之间的与第一DN连接对应的报文转发路径，以及，指示第二转发面网元通过控制面网元建立与为UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径。
在步骤423之后，该方法还包括第二转发面网元确定第一DN连接对应的第一业务策略规则的过程。其中，第一业务策略规则包含指示标识或隧道信息，所述指示标识或隧道信息用于指示第二转发面网元对于从第一转发面网元接收到的下行报文按照隧道内IP五元组进行流检测。所述第二转发面网元确定第一DN连接对应的第一业务策略规则的该过程可由如下步骤424和425实现：
步骤424，控制面网元向第二转发面网元发送会话建立请求消息或重定向响应消息。
其中，步骤423和步骤424中控制面网元向第二转发面网元发送的会话建立请求消息可以为同一个会话建立请求消息。
此外，由于本发明实施例中UE还可能建立以第二转发面网元为锚点的第二DN连接，为方便描述，将第二转发面网元与策略决策网元之间的多个策略控制会话中，与第一DN连接对应的信令连接称为第一策略控制会话，所述第一策略控制会话用于确定与第一DN连接对应的业务策略规则，该业务策略规则称为第一业务策略规则；将第二转发面网元与策略决策网元之间的多个策略控制会话中，与第二DN连接对应的信令连接称为第二策略控制会话，所述第二策略控制会话用于确定与第二DN连接对应的业务策略规则，该业务策略规则称为第二业务策略规则；将第二转发面网元与策略决策网元之间的多个策略控制会话中，与第一DN连接对应的信令连接称为第三策略控制会话，所述第三策略控制会话用于确定与第一DN连接对应的业务策略规则，该业务策略规则称为第三业务策略规则。
步骤425，第二转发面网元根据会话建立请求消息或重定向响应消息从策略决策网元获取第一DN连接对应的第一业务策略规则。
具体的过程为，第二转发面网元与策略决策网元之间建立第一策略控制会话，第二转发面网元通过第一策略控制会话获取第一DN连接对应的第一业务策略规则。
本发明实施例还包括第一转发面网元删除第一DN连接对应的第三业务策略规则的过程，具体可由如下步骤426和427实现：
步骤426，策略决策网元向第一转发面网元发送策略控制会话删除请求消息，策略控制会话删除请求消息用于删除第一转发面网元与策略决策网元之间的第三策略控制会话。
步骤427，第一转发面网元删除第三策略控制会话相关的业务策略规则，并向策略决策网元发送策略控制会话删除应答消息。
实施例四
图10为本发明实施例提供的另一种策略控制方法信号流图，该方法主要涉及的执行主体包括：UE、BS、控制面网元、第一转发面网元、第二转发面网元和策略决策网元。其中，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接，当控制面网元为UE建立以第二转发面网元为锚点的第二DN连接时，进行策略控制会话和转发路径的迁移。本实施例针对图3所示的系统架构和图5所示的应用场景，即策略控制会话位于转发面网元与策略决策网元之间。图10中的源BS即为图5中的BS1，目标BS为图5中的BS2，第一转发面网元为图5中的转发面网元1，第二转发面网元为图5中的转发面网元2。具体的场景描述为：UE位于源BS下时，控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接；UE移动切换到目标BS下时，更新第一DN连接的转发路径，使其通过图5所示的DN连接1或DN连接2接入DN。由此场景触发的策略控制会话的迁移过程和/或转发路径的迁移过程(当UE移动切换到目标BS下，通过图5所示的DN连接1接入DN时，涉及到转发路径的迁移过程)，具体过程参照图10，该方法包括：
步骤431，UE发起第二DN连接建立过程，通过BS向控制面网元发送DN连接建立请求。
步骤432，控制面网元确定第二转发面网元为UE服务。
步骤433，控制面网元更新第一DN连接的转发路径，使第一DN连接的转发路径经过第二转发面网元；
同时，控制面网元还可以建立第二DN连接的转发路径。
在一个示例中，步骤433具体可以包括：控制面网元向第二转发面网元发送会话建立请求消息，会话建立请求消息用于指示第二转发面网元建立与第一转发面网元之间的与第一DN连接对应的报文转发路径，以及，指示第二转发面网元通过控制面网元建立与为UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径。所述会话建立请求消息还可以指示第二转发面网元建立与为UE提供服务的基站之间的与所述第二DN连接对应的报文转发路径。
在步骤433之后，该方法还包括第二转发面网元确定第一DN连接对应的第一业务策略规则及第二DN连接对应的第二业务策略规则的过程。其中，第一业务策略规则包含指示标识或隧道信息，该指示标识或隧道信息用于指示第二转发面网元对于从第一转发面网元接收到的下行报文按照隧道内IP五元组进行流检测。该过程可由如下步骤434和435实现：
为方便描述，本实施例将第二转发面网元与策略决策网元之间的多个策略控制会话中，与第一DN连接对应的信令连接称为第一策略控制会话，所述第一策略控制会话用于确定与第一DN连接对应的业务策略规则，该业务策略规则称为第一业务策略规则；将第二转发面网元与策略决策网元之间的多个策略控制会话中，与第二DN连接对应的信令连接称为第二策略控制会话，所述第二策略控制会话用于确定与第二DN连接对应的业务策略规则，该业务策略规则称为第二业务策略规则；将第一转发面网元与策略决策网元之间的多个策略控制会话中，与第一DN连接对应的信令连接称为第三策略控制会话，所述第三策略控制会话用于确定与第一DN连接对应的业务策略规则，该业务策略规则称为第三业务策略规则。
步骤434，控制面网元向第二转发面网元发送会话建立请求消息或重定向响应消息。
其中，步骤433和步骤434中控制面网元向第二转发面网元发送的会话建立请求消息可以为同一个会话建立请求消息。
步骤435，第二转发面网元根据会话建立请求消息或重定向响应消息从策略决策网元获取第一DN连接对应的第一业务策略规则以及第二DN连接对应的第二业务策略规则。
具体的实现方式有两种：第二转发面网元建立与策略决策网元之间的一 个策略控制会话，通过该策略控制会话从策略决策网元获取第一DN连接对应的第一业务策略规则，以及通过该策略控制会话获取第二DN连接对应的第二业务策略规则；或者，第二转发面网元建立与策略决策网元之间的两个策略控制会话，通过其中一个策略控制会话从策略决策网元获取第一DN连接对应的第一业务策略规则，以及通过另一个策略控制会话获取第二DN连接对应的第二业务策略规则。
图10所示的信号流图给出的是第二种实现方式，即第二转发面网元与策略决策网元之间具体的描述为：
步骤435a，第二转发面网元通过建立与策略决策网元之间的第一策略控制会话以获取与第一DN连接对应的第一业务策略规则。
步骤435b，第二转发面网元通过建立与策略决策网元之间的第二策略控制会话以获取与第二DN连接对应的第二业务策略规则。
需要说明的是，步骤435a与步骤435b之间没有严格的先后执行顺序。
对于第一种实现方式，即第二转发面网元与策略决策网元之间只有一个策略控制会话时，可将图10所述的信号流图中的步骤435a-435b改为如下的处理过程：第二转发面网元与策略决策网元之间建立策略控制会话，通过所述策略控制会话确定第一DN连接对应的第一业务策略规则以及第二DN连接对应的第二业务策略规则。
具体的过程描述为：
第二转发面网元向策略决策网元发送策略控制会话建立请求，携带第一DN连接标识和第二DN连接标识；
策略决策网元确定第一DN连接对应的第一业务策略规则以及第二DN连接对应的第二业务策略规则，并向第二转发面网元发送策略控制会话建立响应消息，携带所述第一业务策略规则及所述第二业务策略规则。
对于第一种实现方式，即第二转发面网元与策略决策网元之间只有一个策略控制会话时，还可将图10所述的信号流图中的步骤435a-435b改为如下的处理过程：第二转发面网元与策略决策网元之间建立策略控制会话，通过所述策略控制会话确定第一DN连接对应的第一业务策略规则。具体的过程描述为：第二转发面网元向策略决策网元发送策略控制会话建立请求，携带第一DN连接标识；策略决策网元确定第一DN连接对应的第一业务策略规则，并向第二转发面网元发送策略控制会话建立响应消息，携带所述第一业务策 略规则。第二转发面网元向策略决策网元发送策略控制会话请求消息，携带第二DN连接标识。策略决策网元确定第二DN连接对应的第二业务策略规则，并向第二转发面网元发送策略控制会话请求相应消息，携带所述第二业务策略规则。
对于第一种实现方式，即第二转发面网元与策略决策网元之间只有一个策略控制会话时，还可将图10所述的信号流图中的步骤435a-435b改为如下的处理过程：第二转发面网元与策略决策网元之间建立策略控制会话，通过所述策略控制会话确定第二DN连接对应的第二业务策略规则。具体的过程描述为：第二转发面网元向策略决策网元发送策略控制会话建立请求，携带第二DN连接标识；策略决策网元确定第二DN连接对应的第二业务策略规则，并向第二转发面网元发送策略控制会话建立响应消息，携带所述第二业务策略规则。第二转发面网元向策略决策网元发送策略控制会话请求消息，携带第一DN连接标识。策略决策网元确定第一DN连接对应的第一业务策略规则，并向第二转发面网元发送策略控制会话请求相应消息，携带所述第一业务策略规则。
本发明实施例还包括第一转发面网元删除第一DN连接对应的第三业务策略规则的过程，具体可由如下步骤436-437实现：
步骤436，策略决策网元向第一转发面网元发送策略控制会话删除请求消息，策略控制会话删除请求消息用于删除第一转发面网元与策略决策网元之间的第三策略控制会话。
步骤437，第一转发面网元向策略决策网元发送策略控制会话删除应答消息。
步骤438，控制面网元通过BS向UE发送DN连接建立响应。
下面通过4个具体的实施例来对本发明提供的策略控制方法进行说明，首先结合图3和图4的系统架构及图5和图6的应用场景对这4个实施例进行概括说明：
本发明实施例中，在进行具体说明时，仅以PDN网络为例进行说明，而不用于对本发明的限定，本发明实施例提供的策略控制方法对于其他的数据网络(Data Network，DN)网络也适用。
需要说明的是，这4个实施例中，UE与转发面网元之间的转发面路径以 承载粒度为例进行说明。所述转发面路径还可以是设备粒度、或者会话粒度，本发明不详细阐述。另外，在这4个实施例中，策略控制会话具体的以Gx会话为例进行描；DN连接具体的以PDN连接为例进行描述。
需要说明的另一点是，这4个实施例中，多个PDN连接可以通过同一个策略控制会话确定相应的业务策略规则，或者，每个PDN连接还可以通过各自对应的策略控制会话确定相应的业务策略规则。
实施例五：场景：如图5所示，UE移动切换后，通过PDN连接1连接到PDN网络，此时转发面网元1与策略决策网元之间存在Gx会话1。方案：在UE建立新的PDN连接3的过程中，进行Gx会话迁移以及转发路径更新。所述PDN连接3，通过转发面网元2连接到PDN网络。所述Gx会话迁移，指的是将Gx会话1迁移到Gx会话2，即将转发面网元1与策略决策网元之间的策略控制会话迁移到转发网元2与策略决策网元之间。所述转发路径更新，指的是将目标BS与转发面网元1之间的转发路径更新为目标BS与转发面网元2、转发面网元2与转发面网元1之间的转发路径。上述目标BS具体可以为图5中的BS2。本发明实施例中，将Gx会话1迁移到Gx会话2；将目标BS与转发面网元1之间的承载迁移到目标BS与转发面网元2之间、转发面网元2与转发面网元1之间。Gx会话3表示的是建立PDN连接3时，转发面网元2与策略决策网元之间的策略控制会话。Gx会话2与Gx会话3可以是不同的策略控制会话，也可以是同一个策略控制会话。
实施例六：场景：如图5所示，UE发生移动切换后，通过PDN连接2连接到PDN网络，此时转发面网元1与策略决策网元之间存在Gx会话1。方案：在UE建立新的PDN连接3过程中，进行Gx会话迁移。所述Gx会话迁移，指的是将Gx会话1迁移到Gx会话2，即将转发面网元1与策略决策网元之间的策略控制会话迁移到转发网元2与策略决策网元之间。Gx会话3表示的是建立PDN连接3时，转发面网元2与策略决策网元之间的策略控制会话。
实施例六与实施例五的区别在于场景不同，实施例六中，由于UE发生移动切换后，通过PDN连接2连接到PDN网络，PDN连接2经过转发面网元2，因此只需进行会话迁移，无需进行承载迁移。
实施例七：场景：如图5所示，UE移动切换后，通过PDN连接2连接到PDN网络，在切换过程中，UE通过转发面网元2及转发面网元1接入PDN 网络。方案：在UE切换过程中，进行Gx会话迁移。所述Gx会话迁移，指的是将Gx会话1迁移到Gx会话2，即将转发面网元1与策略决策网元之间的策略控制会话迁移到转发网元2与策略决策网元之间。
实施例七与实施例五、六的区别在于解决方案不同，实施例五、六的解决方案是在UE新建PDN连接过程中进行Gx会话的迁移；实施例七的解决方案是在UE切换过程中进行Gx会话的迁移。
实施例八：场景：如图6所示，Gx会话位于控制面网元与策略决策网元之间。以UE发生移动切换后，通过PDN连接2访问PDN网络情形为例，进行说明。方案：在UE新建PDN连接3的过程中，发起Gx会话的修改流程。
其中，实施例五至七，以每个PDN连接通过各自对应的Gx会话确定业务策略规则为例进行说明；实施例八，以多个PDN连接通过同一个Gx会话确定相应的业务策略规则为例进行说明。
下面结合信号流图来对本发明实施例五至八进行更为详细的说明。
实施例五
参照图3所示的系统架构和图5所示的应用场景，如图5中所示，UE移动切换后，通过PDN连接1访问PDN网络，本实施例将其称为原PDN连接，对应的锚点为转发面网元1称为原锚点；PDN连接3为UE新建立的PDN连接，对应的锚点为转发面网元2，称为目标锚点。本实施例的技术方案为：在UE新建PDN连接的过程中，若控制面网元确定新PDN连接对应的锚点与原PDN连接对应的锚点不同，则触发Gx会话迁移及承载迁移过程。
图11为本发明实施例五提供的策略控制方法信号流图，参照图11，该方法包括：
步骤501，UE决定发起新PDN连接建立流程。
所述UE决定发起新的PDN连接建立的依据，可以是根据UE保存的PDN连接与位置区域信息的对应关系，即当UE的当前位置不包含在对应关系中的任一位置区域中时，满足新PDN连接建立条件。
所述位置区域信息可以是小区列表，或跟踪区域列表(TAI list)、或位置区域标识、或基站标识组、或物理位置范围等。
步骤502，UE通过基站向控制面网元发送PDN连接建立请求消息。
步骤503，控制面网元确定转发面网元2为UE服务。
控制面网元确定转发面网元的依据，可以是根据UE的当前位置信息或 者BS ID，以及转发面网元的服务范围。
步骤504，控制面网元向转发面网元2发送会话建立请求消息。
当控制面网元确定该UE新建PDN连接所对应的锚点与原PDN连接所对应的锚点不同时，所述会话建立请求消息还携带原锚点的地址和PDN连接1的标识，即转发面网元1的地址和PDN连接1的标识，以指示转发面网元2进行原PDN连接的Gx会话迁移和承载迁移，避免UE具有多个策略决策执行点。
步骤505，转发面网元2发起与策略决策网元之间的策略控制会话的建立流程，即与PDN连接3对应的Gx会话3的建立流程。
在Gx会话3的建立流程中，策略决策网元确定PDN连接3对应的业务策略规则，并将所述业务策略规则发送给转发面网元2。具体的流程描述为，转发面网元2向策略决策网元发送策略控制会话建立请求消息，携带PDN连接3的连接标识；策略决策网元确定PDN连接3对应的业务策略规则，并向转发面网元2发送策略控制会话建立响应消息携带PDN连接3对应的业务策略规则。所述PDN连接3对应的业务策略规则，用于指示转发面网元2对PDN连接3的报文进行处理。
步骤506，转发面网元2根据步骤504中接收到的会话建立请求消息，向转发面网元1发送承载修改请求消息。
所述承载修改请求消息，携带转发面网元2的隧道端点标识(TEID，Tunnel Endpoint Identity)、及PDN连接1的连接标识。
需要说明的是，步骤506与步骤505，并无先后执行顺序，步骤505、506也可以同时发生，本发明实施例不做限定。
步骤506a，转发面网元1向转发面网元2发送承载修改响应消息，携带转发面网元1的隧道端点标识、及PDN连接1的连接标识。
步骤507-508，转发面网元2经控制面网元向BS发送转发面网元重定向通知消息，携带转发面网元2的隧道端点标识、PDN连接1的连接标识；
步骤509-5010，BS经控制面网元向转发面网元2发送重定向响应消息，携带BS的隧道端点标识、PDN连接1的连接标识；
步骤5011，转发面网元2接收到重定向响应消息后，发起转发面网元与策略决策网元之间的策略控制会话的建立流程，即与PDN连接1对应的Gx会话2的建立流程。具体的为，转发面网元2向策略决策网元发送策略控制 会话建立请求消息，携带PDN连接1的连接标识；
步骤5012-5013，策略决策网元确定PDN连接1对应的业务策略规则，向转发面网元2发送策略控制会话建立响应消息，携带PDN连接1对应的业务策略规则。所述PDN连接1对应的业务策略规则，用于指示转发面网元2对PDN连接1的报文进行处理。
所述PDN连接1对应的业务策略规则，包含指示标识或隧道信息，用于指示转发面网元2对来自转发面网元1的下行报文按照隧道内IP五元组进行流检测。
所述隧道信息可以是转发面网元2的隧道端点标识。
需要说明的是，本实施例以每个PDN连接通过各自对应的策略控制会话确定相应的业务策略规则，即步骤505确定PDN连接3对应的业务策略规则，步骤5011-5013确定PDN连接1对应的业务策略规则。当多个PDN连接通过同一个策略控制会话确定相应的业务策略规则时，即Gx会话2和Gx会话3为同一个Gx会话时，步骤5011-5013所示的策略控制会话建立过程，应改为业务策略规则获取过程，具体的过程描述为：
转发面网元2向策略决策网元发送策略控制会话请求消息，携带PDN连接1的连接标识，可选的携带PDN连接3的连接标识；
策略决策网元确定PDN连接1对应的业务策略规则，向转发面网元2发送策略控制会话响应消息，携带PDN连接1对应的业务策略规则。所述PDN连接1对应的业务策略规则，包含指示标识或隧道信息，用于指示转发面网元2对来自转发面网元1的下行报文按照隧道内IP五元组进行流检测。可选的，策略决策网元还确定PDN连接对应的业务策略规则，此时，所述策略控制会话相应消息，还携带PDN连接3对应的业务策略规则。
步骤5014，策略决策网元发起转发面网元1与策略决策网元之间的策略控制会话的删除流程，即Gx会话1的删除流程。
所述Gx会话1删除流程具体可以包括：
步骤5014a，策略控制网元向转发面网元1发送策略控制会话删除请求消息，携带PDN连接1的连接标识。
步骤5014b-5014c，转发面网元1删除PDN连接1相关的业务策略规则，并向策略决策网元发送策略控制会话删除响应消息。
其中，Gx会话1删除流程，可以发生在步骤5011之后的任一步骤，本 发明实施例不做限定。
步骤5015，转发面网元2、控制面网元、BS、UE之间进行信令交互，完成PDN连接3的无线资源重配置，以及BS与转发面网元2之间的承载建立。
步骤5015具体的流程描述可以为：
步骤5015a，转发面网元2向控制面网元发送会话建立响应消息，会话建立响应消息中包含转发面网元2的隧道端点标识。
该步骤5015a为步骤504的响应。
步骤5015b，控制面网元向BS发送承载建立请求消息，承载建立请求消息中携带转发面网元2的隧道端点标识。
步骤5015c-5015d，BS发起其与UE之间的无线资源重配置过程。
步骤5015e，BS向控制面网元发送承载建立响应消息，承载建立响应消息中携带BS TEID。
步骤5015f-5015g，UE通过BS向控制面网元发送PDN连接建立完成消息。
步骤5015h-5015i，控制面网元向转发面网元2发送承载修改请求消息，承载修改请求消息中包含参数BS TEID；转发面网元2向控制面网元发送承载修改响应消息。
其中，步骤5015描述的流程为现有技术，在此不做赘述。
本发明实施例描述的场景是UE发生移动切换后，通过目标BS与原转发面网元1相连，从而连接到PDN网络。当UE发起新的PDN连接建立时，若控制面网元确定新PDN连接对应的锚点与原PDN连接对应的锚点不同时，为避免该UE具有多个策略执行点，则通过承载迁移和Gx会话迁移，使得所有PDN连接通过同一个转发面网元，并通过该转发面网元进行策略控制。
对于UE具有多个策略执行点这种场景，如何解决由于业务流路径的分散导致无法执行UE粒度、APN粒度的策略控制，现有技术并没有给出具体方案。本发明实施例在新建PDN连接的过程中，通过策略控制会话的迁移以及转发路径的迁移，使得所有PDN连接通过同一个转发面网元，并通过该转发面网元对UE的报文进行策略控制。
实施例六
参照图3所示的系统架构和图5所示的应用场景，UE移动切换后，通过PDN连接2访问PDN网络，本发明实施例将PDN连接2称为原PDN连接，对应的锚点为转发面网元1称为原锚点；PDN连接3为UE新建立的PDN连接，对应的锚点为转发面网元2，称为目标锚点。
本实施例的技术方案为：在UE新建PDN连接的过程中，若控制面网元确定新建PDN连接对应的锚点与原PDN连接对应的锚点不同且原PDN连接经过新建PDN连接对应的锚点，则触发策略控制会话迁移，将转发面网元1与策略决策网元之间的策略控制会话迁移到转发面网元2与策略决策网元之间。
图3中，Gx会话1为原PDN连接(即PDN连接2)对应的策略控制会话，即转发面网元1与策略决策网元之间的策略控制会话；Gx会话2为Gx会话迁移后，原PDN连接对应的策略控制会话；Gx会话3为新建PDN连接(即PDN连接3)对应的策略控制会话，即转发面网元2与策略决策网元之间的策略控制会话。
本实施例的具体流程如图12所示。参照图12，该策略控制方法包括：
步骤601，UE发起新的PDN连接建立流程。
所述UE决定发起新的PDN连接建立的依据，可以是根据UE保存的PDN连接与位置区域信息的对应关系，即当UE当前位置不包含在对应关系中的任一位置区域中时，满足新PDN连接建立的条件。所述位置区域信息可以是小区列表，或跟踪区域列表、或位置区域标识、或基站标识组、或物理位置范围等。
步骤602，UE通过基站向控制面网元发送PDN连接建立请求消息。
步骤603，控制面网元确定转发面网元2为UE服务。
控制面网元确定转发面网元的依据，可以是根据UE的当前位置信息或者BS ID，以及转发面网元的服务范围。
步骤604，控制面网元向转发面网元2发送会话建立请求消息。
当控制面网元确定新PDN连接对应的锚点与原PDN连接对应的锚点不同时，所述会话建立请求消息包含原PDN连接的连接标识，用于指示转发面网元2发起与原PDN连接对应的策略控制会话建立流程。
本实施例同样适用于具有多条PDN连接的情形，本实施例仅以2条PDN连接(其中一条是原PDN连接)为例进行说明。
当每个PDN连接通过各自对应的策略控制会话确定相应的业务策略规则时，转发面网元2接收到控制面网元的会话建立请求消息后，与策略决策网元之间发起两个策略控制会话的建立流程，所述两个策略控制会话分别为PDN连接3对应的策略控制会话(即Gx会话3)、及PDN连接2对应的策略控制会话(即Gx会话2)，具体的流程如步骤605-607所述：
步骤605，转发面网元2发起Gx会话3的建立流程。
转发面网元2向策略决策网元发送策略控制会话建立请求消息，携带PDN连接3的连接标识；策略决策网元确定PDN连接3对应的业务策略规则，并向转发面网元2发送策略控制会话会话建立响应消息，携带PDN连接3对应的业务策略规则。
步骤606，转发面网元2发起Gx会话2的建立过程，向策略决策网元发送策略控制会话建立请求消息，携带PDN连接1的连接标识。
步骤607，策略决策网元确定PDN连接1对应的业务策略规则，并向转发面网元2发送策略控制话建立响应消息，携带与PDN连接1对应的业务策略规则。
所述与PDN连接1对应的业务策略规则，包含指示标识或隧道信息，用于指示转发面网元2对来自转发面网元1的下行报文按照隧道内IP五元组进行流检测。
需要说明的是，Gx会话3和Gx会话2的建立过程不分先后，即步骤605与步骤606-步骤607之间的执行顺序不分先后。
可选的，还包括以下步骤。
步骤608，转发面网元2向转发面网元1发送承载修改请求消息。
所述承载修改请求消息，用于指示转发面网元1已完成Gx会话1的迁移；所述Gx会话1指的是转发面网元1与策略决策网元之间的策略控制会话。
步骤609，转发面网元1发起Gx会话1的释放流程。
本发明实施例中，步骤609所描述的Gx会话1释放流程，也可以由策略决策网元发起。当由策略决策网元发起时，该步骤可以发生在步骤606之后的任一步骤，本发明不做限定。
可选的，作为步骤608的响应，还可以包括如下步骤。
步骤6010，转发面网元1向转发面网元2发送承载修改响应消息。
步骤6011，完成新建PDN连接3的无线资源的重配置，以及BS与转发 面网元2之间承载的建立。
本发明实施例中，当多个PDN连接通过同一个策略控制会话确定相应的业务策略规则时，步骤605-607由如下处理过程代替：
转发面网元2发起Gx会话3建立流程，具体流程描述为：
转发面网元2向策略决策网元发送策略控制会话建立请求消息，携带PDN连接2的连接标识、以及PDN连接3的连接标识；
策略决策网元确定PDN连接2对应的业务策略规则、以及PDN连接3对应的业务策略规则，并向转发面网元2发送策略控制会话建立响应消息，携带PDN连接2对应的业务策略规则、以及PDN连接3对应的业务策略规则。所述PDN连接2对应的业务策略规则，用于指示转发面网元2对PDN连接2的报文进行策略控制；所述PDN连接3对应的业务策略规则，用于指示转发面网元2对PDN连接诶3的报文进行策略控制。所述PDN连接1对应的业务策略规则携带指示标识或隧道信息，用于指示转发面网元2对来自转发面网元1的下行报文按照隧道内IP五元组进行流检测。所述隧道信息可以是转发面网元2的TEID。
本实施例描述的是UE移动切换后，通过目标BS、目标转发面网元2与原转发面网元1相连，从而连接到PDN网络的场景。当UE发起新的PDN连接建立时，若控制面网元确定新PDN连接对应的锚点与原PDN连接对应的锚点不时，为避免该UE具有多个策略执行点，则通过Gx会话的迁移，保证所有PDN连接通过同一个转发面网元，并通过该转发面网元进行策略控制，避免由于业务流路径的分散，导致无法执行UE粒度或APN粒度的策略控制。
发明方案区别于现有技术的改进之处在于，UE在新建PDN连接的过程中，进行Gx会话的迁移。
实施例七
参照图3所示的系统架构和图5所示的应用场景，UE在切换过程中，如果控制面网元确定由新的转发面网元为UE服务时，则触发Gx会话的迁移过程。
本实施例的具体流程如图13所示。参照图13，该策略控制方法包括：
步骤701，源BS发起切换，UE同步到目标BS。
步骤702，UE向目标BS发送切换确认消息。
所述切换确认消息，用于表明UE成功同步到目标BS。
步骤703，目标BS向控制面网元发送切换通知消息。
步骤704，控制面网元确定由位置较优的转发面网元2为UE服务，并向转发面网元2发送承载修改请求消息。
所述承载修改请求消息包含目标BS的IP地址，以及目标BS的TEID。
步骤705，转发面网元2发起Gx会话2建立流程。
具体地，转发面网元2向策略决策网元发送策略控制会话建立请求消息；
策略决策网元确定PDN连接2对应的业务策略规则，并向转发面网元2发送策略控制会话建立响应消息，携带与PDN连接2对应的业务策略规则；
所述PDN连接2对应的业务策略规则，包含指示标识或隧道信息，用于指示转发面网元2对来自转发面网元1的下行报文按照隧道内IP五元组进行流检测。
步骤706，转发面网元2向转发面网元1发送承载修改请求消息，携带转发面网元2的TEID。
其中，步骤705、步骤706并无严格的执行先后顺序，也可以同时发生，本发明不做限定。
步骤707，转发面网元1接收到来自转发面网元2的承载修改请求消息之后，发起Gx会话1的删除过程。
具体的流程描述可以为：
步骤707a，转发面网元1向策略决策网元发送策略控制会话修改请求消息。
步骤708，策略决策网元向转发面网元1发送策略控制会话修改响应消息。
步骤709，转发面网元1根据接收到策略控制会话修改响应消息，删除与Gx会话1相关的业务策略规则。
步骤7010，转发面网元1向转发面网元2发送承载修改响应消息。
所述承载修改响应消息为步骤706的响应消息。
步骤7011，转发面网元2向控制面网元发送承载修改响应消息。
所述承载修改响应消息为步骤704的响应消息，包含转发面网元2的IP地址，以及转发面网元2的TEID。
步骤7012，当跟踪区更新TAU条件满足时，UE发起TAU流程。
可选的，还包括如下步骤：
步骤7013，UE发起新PDN连接3的建立流程。
在PDN连接3的建立流程中，控制面网元确定转发面网元2为UE服务，转发面网元2发起与策略决策网元之间的Gx会话3的建立过程，策略决策网元进行策略决策，将与新建PDN连接对应的业务策略规则下发给转发面网元2。
其中，当多个PDN连接通过同一个策略控制会话确定相应的业务策略规则时，则在UE发起的新PDN连接3的建立过程(步骤7013)中，转发面网元2通过向策略决策网元发起业务策略规则获取过程来确定PDN连接3对应的业务策略规则。
本实施例描述的场景是UE移动切换时，通过目标BS、目标转发面网元2与原转发面网元1相连，从而连接到PDN网络的场景。在UE切换时，当控制面网元确定由位置较优的新转发面网元为UE服务时，由新的转发面网元发起策略控制会话的迁移过程，使得PDN连接的策略控制执行点位于位置较优的转发面网元上。
发明方案实施例七区别于现有技术的改进之处在于，UE在切换过程中，通过策略控制会话的迁移过程，将策略执行点迁移到位置较优的转发面网元上。
实施例八
参照图4所示的系统架构和图6所示的应用场景，本实施例以UE发生移动切换后，通过PDN连接2接入PDN网络为例进行说明。另外，本实施例中策略控制会话位于控制面网元与策略决策网元之间，且多个PDN连接通过同一个策略控制会话确定相应的业务策略规则。
如图6所示，PDN连接2为UE移动切换后的PDN连接，本实施例将其称为原PDN连接，对应的锚点为转发面网元1，称为原锚点；PDN连接3为UE新建立的PDN连接，对应的锚点为转发面网元2，称为目标锚点。
本实施例的技术方案为，UE在新建PDN连接的过程中，若控制面网元确定该UE的新建PDN连接对应的锚点与原锚点不同时，为避免UE具有多个策略执行点，则通过策略控制会话的迁移过程，将策略执行点迁移到新建PDN连接对应的锚点上。
本实施例的具体流程如图14所示。参照图14，该策略控制方法包括：
步骤801，UE发起新的PDN连接建立流程。
所述UE决定发起新的PDN连接建立的依据，可以是根据UE保存的PDN连接与位置区域信息的对应关系，即当UE当前位置不包含在对应关系中的任一位置区域中时，满足新PDN连接建立条件。所述位置区域信息可以是小区列表，或跟踪区域列表、或位置区域标识、或基站标识组、或物理位置范围等。
步骤802，UE通过基站向控制面网元发送PDN连接建立请求消息。
所述PDN连接建立请求消息中携带UE当前位置信息。
步骤803，控制面网元确定由转发面网元2为UE服务。
所述确定转发面网元的依据，可以是根据UE的当前位置信息或者BS ID，以及转发面网元的服务范围。
步骤804，控制面网元确定UE新建PDN连接对应的锚点与原锚点不同，则发起业务策略规则获取流程，向策略决策网元发送策略控制会话请求消息。
所述策略控制会话请求消息携带PDN连接3的连接标识、以及PDN连接2的连接标识。可选的，还携带新PDN连接对应的锚点的标识，即转发面网元2的标识，用于指示策略决策网元PDN连接的策略执行点位于转发面网元2。
步骤805-806，策略决策网确定PDN连接3对应的业务策略规则、以及PDN连接2对应的业务策略规则，并向控制面网元发送策略控制会话响应消息，携带PDN连接3对应的业务策略规则、以及PDN连接2对应的业务策略规则。
所述PDN连接2对应的业务策略规则用于指示转发面网元2对PDN连接2的报文进行策略控制；所述PDN连接3对应的业务策略规则用于指示转发面网元2对PDN连接3对应的报文进行策略控制。其中，所述PDN连接2对应的业务策略规则包含指示标识或隧道信息，用于指示转发面网元2对来自转发面网元1的下行报文按照隧道内IP五元组进行流检测。
步骤807，控制面网元向转发面网元1发送业务策略规则删除请求消息。
所述策略规则删除请求消息用于删除转发面网元1上的关于PDN连接2的业务策略规则，携带业务策略规则的标识。所述业务策略规则标识，用于表示所要删除的业务策略规则，可以是PDN连接标识。在本实施例中，所述 业务策略规则标识为PDN连接2的连接标识。
步骤808-809，转发面网元1删除PDN连接2对应的业务策略规则，并向控制面网元发送业务策略规则删除响应消息。
步骤807、809中所述的业务策略规则删除请求/响应消息，可以采用现有EPC网络中多PDN连接建立时的消息，如承载修改请求/响应消息。
步骤8010，完成UE与BS之间的无线资源的重配置，以及控制面网元向转发面网元2下发报文转发策略。
所述报文转发策略携带步骤806中的业务策略规则。
步骤8010可以发生在步骤806之后的任一步骤，具体执行顺序本发明不做限定。
需要说明的是，当每个PDN连接通过各自对应的策略控制会话确定相应的业务策略规则时，步骤804-809可由如下处理过程代替：
控制面网元向策略决策网元发起业务策略规则获取流程、以及策略控制会话建立流程。
其中，所述业务策略规则获取流程指的是控制面网元向策略决策网元获取与PDN连接2对应的业务策略规则；所述策略控制会话建立流程指的是与新PDN连接3对应的控制面网元与策略决策网元之间的策略控制会话，通过该策略控制会话确定PDN连接3对应的业务策略规则。
在业务策略规则获取过程中，控制面网元向策略决策网元发送策略控制会话请求，携带PDN连接2标识及转发面网元2标识；策略决策网元重新为PDN连接2确定对应的业务策略规则，并向控制面网元发送策略控制会话响应消息，携带所述PDN连接2对应的业务策略规则。所述PDN连接2对应的业务策略规则，包含指示标识或隧道信息，用于指示转发面网元2对来自转发面网元1的下行报文按照隧道内IP五元组进行流检测。
在策略控制会话建立过程中，控制面网元向策略决策网元发送策略控制会话建立请求，携带PDN连接3标识及转发面网元2标识。策略决策网元为新建PDN连接3确定相应的业务策略规则，并将PDN连接3对应的业务策略规则发送给控制面网元。
本实施例描述的是当UE发起新的PDN连接建立时，如果控制面网元确新建PDN连接所对应的锚点与原锚点不同，则通过策略执行点的迁移过程使得策略执行点位于新建PDN连接对应的锚点处。
发明方案实施例八与现有技术相比，改进之处在于，UE在新建PDN连接的过程中，通过策略执行点的迁移过程使得策略执行点位于新建PDN连接对应的锚点处。
本发明上述实施例中仅以2个PDN连接为例进行说明，其中一个PDN连接为原PDN连接，另一个PDN连接为新建立的PDN连接。当存在2个以上的PDN连接时，处理过程类似，例如，原有10个PDN连接，这10个PDN连接均为原PDN连接，新建立了一个PDN连接，该PDN连接为新建立的PDN连接，对于存在多个原PDN连接的情况，可以对这多个原PDN连接的承载迁移过程和Gx会话迁移过程合并处理，在此不做赘述。
图15为本发明实施例提供的一种控制面网元结构图，该控制面网元用于实现本发明实施例提供的策略控制方法中控制面网元的功能，该控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接；该控制面网元包括：
存储器1501、处理器1502和通信接口1503；
所述存储器1501，用于存储程序指令；
所述处理器1502，用于根据所述存储器1501中存储的程序指令执行以下操作：
当通过所述通信接口1503接收到所述UE的切换通知消息，确定由第二转发面网元为所述UE服务时，或当为所述UE建立以第二转发面网元为锚点的第二DN连接时，更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元，由所述第二转发面网元对所述第一DN连接的报文进行策略控制。
在一个示例中，所述处理器1502执行所述更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元的操作之后，所述处理器1502还用于根据所述存储器1501中存储的程序指令执行以下操作：
通过所述通信接口1503向所述第二转发面网元发送会话建立请求消息或重定向响应消息，所述会话建立请求消息或重定向响应消息用于指示所述第二转发面网元从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
通过所述通信接口1503从所述策略决策网元获取更新后的所述第一DN 连接对应的第一业务策略规则；将所述第一业务策略规则通过所述通信接口1503发送给所述第二转发面网元，所述第一业务策略规则用于对更新后的所述第一DN连接的报文进行策略控制。
在一个示例中，所述处理器1502执行所述为所述UE建立以第二转发面网元为锚点的第二DN连接的操作，包括：
通过所述通信接口1503向所述第二转发面网元发送会话建立请求消息或重定向响应消息，所述会话建立请求消息或重定向响应消息用于指示所述第二转发面网元从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则，根据所述第二业务策略规则对所述第二DN连接的报文进行策略控制；或者
通过所述通信接口1503从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则；将所述第二业务策略规则通过所述通信接口1503发送给所述第二转发面网元，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制。
在一个示例中，所述处理器1502执行所述通过所述通信接口1503从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则和所述第二DN连接对应的第二业务策略规则的操作，包括：
建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话通过所述通信接口1503从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话通过所述通信接口1503从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话通过所述通信接口1503获取所述第二DN连接对应的第二业务策略规则。
在一个示例中，所述处理器1502执行所述建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话通过所述通信接口1503从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则的操作，包括：
通过所述通信接口1503向所述策略决策网元发送第一策略控制会话建立 请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识和所述第二DN连接的连接标识；通过所述通信接口1503接收所述策略决策网元根据所述第一策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则和与所述第二DN连接对应的第二业务策略规则；或者，
通过所述通信接口1503向所述策略决策网元发送第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；通过所述通信接口1503接收所述策略决策网元根据所述第二策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则；通过所述通信接口1503向所述策略决策网元发送策略控制会话请求消息，所述策略控制会话请求消息中携带所述第一DN连接的连接标识；通过所述通信接口1503接收所述策略决策网元根据所述策略控制会话请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；或者，
所述处理器1502执行所述建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话通过所述通信接口1503从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话通过所述通信接口1503获取所述第二DN连接对应的第二业务策略规则的操作，包括：
通过所述通信接口1503向所述策略决策网元发送第三策略控制会话建立请求消息，所述第三策略控制会话建立请求消息中携带所述第一DN连接的连接标识；通过所述通信接口1503接收所述策略决策网元根据所述第三策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；通过所述通信接口1503向所述策略决策网元发送第四策略控制会话建立请求消息，所述第四策略控制会话建立请求消息中携带所述第二DN连接的连接标识；通过所述通信接口1503接收所述策略决策网元根据所述第四策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则。
在一个示例中，所述第一业务策略规则中包含指示标识或隧道信息，所述指示标识或隧道信息用于指示所述第二转发面网元对于从所述第一转发面网元接收到的下行报文按照隧道内IP五元组进行流检测。
在一个示例中，所述处理器1502执行所述更新所述第一DN连接的转发 路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元的操作，包括：
通过所述通信接口1503向所述第二转发面网元发送会话建立请求消息，所述会话建立请求消息用于指示所述第二转发面网元建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，指示所述第二转发面网元通过所述控制面网元建立与为所述UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径；或者，
通过所述通信接口1503向所述第一转发面网元发送第一报文转发策略，向所述第二转发网元发送第二报文转发策略，向为所述UE提供服务的基站发送第三报文转发策略，所述第一报文转发策略、所述第二报文转发策略及所述第三报文转发策略用于建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径及所述第二转发面网元与所述基站之间的报文转发路径。
在一个示例中，所述处理器1502执行所述通过所述通信接口1503从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则之后，所述处理器还用于根据所述存储器中存储的程序指令执行以下操作：
通过所述通信接口1503接收所述策略决策网元发送的策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述控制面网元与所述策略决策网元之间的策略控制会话；
根据接收到的所述策略控制会话删除请求消息通过所述通信接口1503向所述第一转发面网元发送业务策略规则删除请求消息，所述业务策略规则删除请求消息用于指示所述第一转发面网元删除所述第一DN连接对应的第三业务策略规则。
图16为本发明实施例提供的一种转发面网元结构图，所述转发面网元为第二转发面网元，UE具有以第一转发面网元为锚点的第一DN连接，所述第二转发面网元包括：存储器1601和处理器1602；
所述存储器1601，用于存储程序指令；
所述处理器1602，用于根据所述存储器1601中存储的程序指令执行以下操作：
更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元；
对更新后的所述第一DN连接的报文进行策略控制。
在一个示例中，所述第二转发面网元还包括通信接口1603；
所述处理器1602执行所述对更新后的所述第一DN连接的报文进行策略控制的操作，包括：
通过所述通信接口1603接收控制面网元发送的会话建立请求消息或重定向响应消息，根据所述会话建立请求消息或重定向响应消息从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
通过所述通信接口1603接收所述控制面网元发送的更新后的所述第一DN连接对应的所述第一业务策略规则；根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制。
在一个示例中，所述UE还具有以所述第二转发面网元为锚点的第二DN连接，所述处理器1602还用于根据所述存储器1601中存储的程序指令执行以下操作：
通过所述通信接口1603接收所述控制面网元发送的会话建立请求消息或重定向响应消息，根据所述会话建立请求消息或重定向响应消息通过所述通信接口1603从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则，根据所述第二业务策略规则对所述第二DN连接的报文进行策略控制；或者，
通过所述通信接口1603接收所述控制面网元发送的所述第二DN连接对应的第二业务策略规则；根据所述第二业务策略规则对所述第二DN连接的报文进行策略控制。
在一个示例中，所述处理器1602执行所述通过所述通信接口1603从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则和所述第二DN连接对应的第二业务策略规则的操作，包括：
建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话通过所述通信接口1603从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话通过所述通信接口1603从所述策略决策网元 获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话通过所述通信接口1603获取所述第二DN连接对应的第二业务策略规则。
在一个示例中，所述处理器1602执行所述建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话通过所述通信接口1603从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则的操作，包括：
通过所述通信接口1603向所述策略决策网元发送第一策略控制会话建立请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识和所述第二DN连接的连接标识；通过所述通信接口1603接收所述策略决策网元根据所述第一策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则和与所述第二DN连接对应的第二业务策略规则；或者，
通过所述通信接口1603向所述策略决策网元发送第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；通过所述通信接口1603接收所述策略决策网元根据所述第二策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则；通过所述通信接口1603向所述策略决策网元发送策略控制会话请求消息，所述策略控制会话请求消息中携带所述第一DN连接的连接标识；通过所述通信接口1603接收所述策略决策网元根据所述策略控制会话请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；或者，
所述处理器1602执行所述建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话通过所述通信接口1603从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话通过所述通信接口1603获取所述第二DN连接对应的第二业务策略规则的操作，包括：
通过所述通信接口1603向所述策略决策网元发送第三策略控制会话建立请求消息，所述第三策略控制会话建立请求消息中携带所述第一DN连接的连接标识；通过所述通信接口1603接收所述策略决策网元根据所述第三策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；通过所述通信接口1603向所述策略决策网元发送第四策略控制会 话建立请求消息，所述第四策略控制会话建立请求消息中携带所述第二DN连接的连接标识；通过所述通信接口1603接收所述策略决策网元根据所述第四策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则。
在一个示例中，所述处理器1602执行所述更新所述第一DN连接的转发路径的操作，包括：
通过所述通信接口1603接收控制面网元发送的会话建立请求消息，根据所述会话建立请求消息建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，通过所述控制面网元建立与为所述UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径；或者，
通过所述通信接口1603接收所述控制面网元发送的第二报文转发策略，以使所述第二转发面网元根据所述第二报文转发策略、所述第一转发面网元根据从所述控制面网元接收的第一报文转发策略，建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径；所述第二转发面网元根据所述第二报文转发策略、为所述UE提供服务的基站根据从所述控制面网元接收的第三报文转发策略，建立与所述第一DN连接对应的所述第二转发面网元与所述基站之间的报文转发路径。
图17为本发明实施例提供的一种策略决策网元结构图，UE具有以第一转发面网元为锚点的第一DN连接，所述策略决策网元包括：存储器1701、处理器1702和通信接口1703；
所述存储器1701，用于存储程序指令；
所述处理器1702，用于根据所述存储器1701中存储的程序指令执行以下操作：
通过所述通信接口1703接收控制面网元或第二转发面网元发送的第一策略控制会话建立请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识；
根据所述第一策略控制会话建立请求消息通过所述通信接口1703向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则，所述第一业务策略规则用于对所述第一DN连接的报文进行策略控制。
在一个示例中，所述处理器1702还用于根据所述存储器1701中存储的程序指令执行以下操作：
所述第一策略控制会话建立请求消息中还携带第二DN连接的连接标识，所述第二DN连接以所述第二转发面网元为锚点；根据所述第一策略控制会话建立请求消息通过所述通信接口1703向所述第二转发面网元或所述控制面网元发送所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制；或者，
通过所述通信接口1703接收所述第二转发面网元或者所述控制面网元发送的策略控制会话请求消息，所述策略控制会话请求消息中携带所述第二DN连接标识；根据所述策略控制会话请求消息通过所述通信接口1703向所述第二转发面网元或者所述控制面网元发送与所述第二DN连接对应的第二业务策略队则，所述第二业务策略规则用于对所第二DN连接的报文进行策略控制；或者，
通过所述通信接口1703接收所述第二转发面网元或者所述控制面网元发送的第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；根据所述第二策略控制会话建立请求消息通过所述通信接口1703向所述第二转发面网元或者所述控制面网元发送与所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制。
在一个示例中，所述处理器1702执行所述根据所述第一策略控制会话建立请求消息通过所述通信接口1703向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则之后，所述处理器1702还用于根据所述存储器1701中存储的程序指令执行以下操作：
通过所述通信接口1703向所述第一转发面网元或者所述控制面网元发送策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述第一转发面网元与所述策略决策网元之间的策略控制会话或者删除所述控制面网元与所述策略决策网元之间的策略控制会话。
图18为本发明实施例提供的另一种控制面网元结构图，该控制面网元用于实现本发明实施例提供的策略控制方法中控制面网元的功能，该控制面网元为UE建立了以第一转发面网元为锚点的第一DN连接；该控制面网元包括：接收单元1801和处理单元1802；
接收单元1801，用于接收其他网元发送的消息或指令；
其中，接收单元1801具体可以通过前述通信接口1503进行接收。
处理单元1802，用于当所述接收单元1801接收到所述UE的切换通知消息，确定由第二转发面网元为所述UE服务时，或当为所述UE建立以第二转发面网元为锚点的第二DN连接时，更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元，由所述第二转发面网元对所述第一DN连接的报文进行策略控制。
其中，处理单元1802具体可以为前述处理器1502。
在一个示例中，所述控制面网元还包括发送单元1803；
发送单元1803，用于向其他网元发送消息或指令；
其中，发送单元1803具体可以通过前述通信接口1503进行发送。
在更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元之后，所述处理单元1802还用于：
指示发送单元1803向所述第二转发面网元发送会话建立请求消息或重定向响应消息，所述会话建立请求消息或重定向响应消息用于指示所述第二转发面网元从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
指示接收单元1801从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则；指示发送单元1803将所述第一业务策略规则发送给所述第二转发面网元，所述第一业务策略规则用于对更新后的所述第一DN连接的报文进行策略控制。
在一个示例中，所述处理单元1802具体用于：
指示发送单元1803向所述第二转发面网元发送会话建立请求消息或重定向响应消息，所述会话建立请求消息或重定向响应消息用于指示所述第二转发面网元从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则，根据所述第二业务策略规则对所述第二DN连接的报文进行策略控制；或者
指示接收单元1801从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则；指示发送单元1803将所述第二业务策略规则发送给所述第二转发面网元，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制。
在一个示例中，所述处理单元1802具体用于：
建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话获取所述第二DN连接对应的第二业务策略规则。
在一个示例中，所述处理单元1802具体用于：
指示发送单元1803向所述策略决策网元发送第一策略控制会话建立请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识和所述第二DN连接的连接标识；指示接收单元1801接收所述策略决策网元根据所述第一策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则和与所述第二DN连接对应的第二业务策略规则；或者，
指示发送单元1803向所述策略决策网元发送第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；指示接收单元1801接收所述策略决策网元根据所述第二策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则；指示发送单元1803向所述策略决策网元发送策略控制会话请求消息，所述策略控制会话请求消息中携带所述第一DN连接的连接标识；指示接收单元1801接收所述策略决策网元根据所述策略控制会话请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；或者，
建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话获取所述第二DN连接对应的第二业务策略规则，包括：
指示发送单元1803向所述策略决策网元发送第三策略控制会话建立请求消息，所述第三策略控制会话建立请求消息中携带所述第一DN连接的连接标识；指示接收单元1801接收所述策略决策网元根据所述第三策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；指示发送单元1803向所述策略决策网元发送第四策略控制会话建立请求消 息，所述第四策略控制会话建立请求消息中携带所述第二DN连接的连接标识；指示接收单元1801接收所述策略决策网元根据所述第四策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则。
在一个示例中，所述第一业务策略规则中包含指示标识或隧道信息，所述指示标识或隧道信息用于指示所述第二转发面网元对于从所述第一转发面网元接收到的下行报文按照隧道内IP五元组进行流检测。
在一个示例中，所述处理单元1802具体用于：
指示发送单元1803向所述第二转发面网元发送会话建立请求消息，所述会话建立请求消息用于指示所述第二转发面网元建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，指示所述第二转发面网元通过所述控制面网元建立与为所述UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径；或者，
指示发送单元1803向所述第一转发面网元发送第一报文转发策略，向所述第二转发网元发送第二报文转发策略，向为所述UE提供服务的基站发送第三报文转发策略，所述第一报文转发策略、所述第二报文转发策略及所述第三报文转发策略用于建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径及所述第二转发面网元与所述基站之间的报文转发路径。
在一个示例中，从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则之后，所述处理单元1802还用于：
指示接收单元1801接收所述策略决策网元发送的策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述控制面网元与所述策略决策网元之间的策略控制会话；
根据接收到的所述策略控制会话删除请求消息指示发送单元1803向所述第一转发面网元发送业务策略规则删除请求消息，所述业务策略规则删除请求消息用于指示所述第一转发面网元删除所述第一DN连接对应的第三业务策略规则。
图19为本发明实施例提供的另一种转发面网元结构图，该转发面网元用于实现本发明实施例提供的策略控制方法中第二转发面网元的功能，UE具有以第一转发面网元为锚点的第一DN连接，该转发面网元包括：
处理单元1901，用于更新所述第一DN连接的转发路径，使更新后的所 述第一DN连接的转发路径经过所述第二转发面网元；对更新后的所述第一DN连接的报文进行策略控制。
其中，处理单元1901具体可以为前述处理器1602。
在一个示例中，该转发面网元还包括接收单元1902；
接收单元1902，用于接收其他网元发送的消息或指令；
其中，接收单元1902具体可以通过前述通信接口1603进行接收。
处理单元1901具体用于：
指示接收单元1902接收控制面网元发送的会话建立请求消息或重定向响应消息，根据所述会话建立请求消息或重定向响应消息从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
指示接收单元1902接收所述控制面网元发送的更新后的所述第一DN连接对应的所述第一业务策略规则；根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制。
在一个示例中，所述UE还具有以所述第二转发面网元为锚点的第二DN连接，所述处理单元1901还用于：
指示接收单元1902接收所述控制面网元发送的会话建立请求消息或重定向响应消息，根据所述会话建立请求消息或重定向响应消息从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则，根据所述第二业务策略规则对所述第二DN连接的报文进行策略控制；或者，
指示接收单元1902接收所述控制面网元发送的所述第二DN连接对应的第二业务策略规则；根据所述第二业务策略规则对所述第二DN连接的报文进行策略控制。
在一个示例中，所述处理单元1901具体用于：
建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话获取所述第二DN连接对应的第二业务策略规则。
在一个示例中，该转发面网元还包括发送单元1903；
发送单元1903，用于向其他网元发送消息或指令；
其中，发送单元1903具体可以通过前述通信接口1603进行发送；
所述处理单元1901具体用于：
指示发送单元1903向所述策略决策网元发送第一策略控制会话建立请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识和所述第二DN连接的连接标识；指示接收单元1902接收所述策略决策网元根据所述第一策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则和与所述第二DN连接对应的第二业务策略规则；或者，
指示发送单元1903向所述策略决策网元发送第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；指示接收单元1902接收所述策略决策网元根据所述第二策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则；指示发送单元1903向所述策略决策网元发送策略控制会话请求消息，所述策略控制会话请求消息中携带所述第一DN连接的连接标识；指示接收单元1902接收所述策略决策网元根据所述策略控制会话请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；或者，
所述处理单元1901具体用于：
指示发送单元1903向所述策略决策网元发送第三策略控制会话建立请求消息，所述第三策略控制会话建立请求消息中携带所述第一DN连接的连接标识；指示接收单元1902接收所述策略决策网元根据所述第三策略控制会话建立请求消息发送的与更新后的所述第一DN连接对应的第一业务策略规则；指示发送单元1903向所述策略决策网元发送第四策略控制会话建立请求消息，所述第四策略控制会话建立请求消息中携带所述第二DN连接的连接标识；指示接收单元1902接收所述策略决策网元根据所述第四策略控制会话建立请求消息发送的与所述第二DN连接对应的第二业务策略规则。
在一个示例中，所述处理单元1901具体用于：
指示接收单元1902接收控制面网元发送的会话建立请求消息，根据所述会话建立请求消息建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，通过所述控制面网元建立与为所述UE提供服务的 基站之间的与所述第一DN连接对应的报文转发路径；或者，
指示接收单元1902接收所述控制面网元发送的第二报文转发策略，以使所述第二转发面网元根据所述第二报文转发策略、所述第一转发面网元根据从所述控制面网元接收的第一报文转发策略，建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径；根据所述第二报文转发策略、为所述UE提供服务的基站根据从所述控制面网元接收的第三报文转发策略，建立与所述第一DN连接对应的所述第二转发面网元与所述基站之间的报文转发路径。
图20为本发明实施例提供的另一种策略决策网元结构图，该策略决策网元用于实现本发明实施例提供的策略控制方法中策略决策网元的功能，UE具有以第一转发面网元为锚点的第一DN连接，该策略决策网元包括：
接收单元2001，用于接收其他网元发送的消息或指令；
其中，接收单元2001具体可以通过前述通信接口1703进行接收；
发送单元2002，用于向其他网元发送消息或指令；
其中，发送单元1903具体可以通过前述通信接口1703进行发送；
处理单元2003，用于指示接收单元2001接收控制面网元或第二转发面网元发送的第一策略控制会话建立请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识；
根据所述第一策略控制会话建立请求消息指示发送单元2002向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则，所述第一业务策略规则用于对所述第一DN连接的报文进行策略控制。
在一个示例中，处理单元2003还用于：
所述第一策略控制会话建立请求消息中还携带第二DN连接的连接标识，所述第二DN连接以所述第二转发面网元为锚点；根据所述第一策略控制会话建立请求消息指示发送单元2002向所述第二转发面网元或所述控制面网元发送所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制；或者，
指示接收单元2001接收所述第二转发面网元或者所述控制面网元发送的策略控制会话请求消息，所述策略控制会话请求消息中携带所述第二DN连接标识；根据所述策略控制会话请求消息指示发送单元2002向所述第二转发面网元或者所述控制面网元发送与所述第二DN连接对应的第二业务策略队 则，所述第二业务策略规则用于对所第二DN连接的报文进行策略控制；或者，
指示接收单元2001接收所述第二转发面网元或者所述控制面网元发送的第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；根据所述第二策略控制会话建立请求消息指示发送单元2002向所述第二转发面网元或者所述控制面网元发送与所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制。
在一个示例中，根据所述第一策略控制会话建立请求消息向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则之后，所述处理单元2003还用于：
指示发送单元2002向所述第一转发面网元或者所述控制面网元发送策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述第一转发面网元与所述策略决策网元之间的策略控制会话或者删除所述控制面网元与所述策略决策网元之间的策略控制会话。
图21为本发明实施例提供的一种策略控制系统结构图，所述系统包括：控制面网元2101、转发面网元2102、策略决策网元2103，其中，控制面网元2101、转发面网元2102、策略决策网元2103用于实现本发明实施例提供的策略控制方法。
结合本发明公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(Random Access Memory，RAM)、闪存、只读存储器(Read Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、电可擦可编程只读存储器(Electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于核心网接口设备中。当然，处理器和存储介质也可以作为分立组件存在于核心网接口设备中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。

Claims (29)

  1. 一种策略控制方法，其特征在于，控制面网元为用户设备UE建立了以第一转发面网元为锚点的第一数据网络DN连接；所述方法包括：
    当所述控制面网元接收到所述UE的切换通知消息，确定由第二转发面网元为所述UE服务时，或当所述控制面网元为所述UE建立以第二转发面网元为锚点的第二DN连接时，所述控制面网元更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元，由所述第二转发面网元对所述第一DN连接的报文进行策略控制。
  2. 如权利要求1所述的方法，其特征在于，所述控制面网元更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元之后，所述方法还包括：
    所述控制面网元向所述第二转发面网元发送会话建立请求消息或重定向响应消息，所述会话建立请求消息或重定向响应消息用于指示所述第二转发面网元从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
    所述控制面网元从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则；所述控制面网元将所述第一业务策略规则发送给所述第二转发面网元，所述第一业务策略规则用于对更新后的所述第一DN连接的报文进行策略控制。
  3. 如权利要求2所述的方法，其特征在于，所述方法还包括：
    所述控制面网元从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则；
    所述控制面网元从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则和所述第二DN连接对应的第二业务策略规则，包括：
    所述控制面网元建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
    所述控制面网元建立与所述策略决策网元之间的两个策略控制会话，通 过所述两个策略控制会话其中一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话获取所述第二DN连接对应的第二业务策略规则。
  4. 如权利要求2或3所述的方法，其特征在于：
    所述第一业务策略规则中包含指示标识或隧道信息，所述指示标识或隧道信息用于指示所述第二转发面网元对于从所述第一转发面网元接收到的下行报文按照隧道内网络协议IP五元组进行流检测。
  5. 如权利要求1至4中任一项所述的方法，其特征在于，所述控制面网元更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元，包括：
    所述控制面网元向所述第二转发面网元发送会话建立请求消息，所述会话建立请求消息用于指示所述第二转发面网元建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，指示所述第二转发面网元通过所述控制面网元建立与为所述UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径；或者，
    所述控制面网元向所述第一转发面网元发送第一报文转发策略，向所述第二转发网元发送第二报文转发策略，向为所述UE提供服务的基站发送第三报文转发策略，所述第一报文转发策略、所述第二报文转发策略及所述第三报文转发策略用于建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径及所述第二转发面网元与所述基站之间的报文转发路径。
  6. 如权利要求2或3所述的方法，其特征在于，所述控制面网元从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则之后，所述方法还包括：
    所述控制面网元接收所述策略决策网元发送的策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述控制面网元与所述策略决策网元之间的策略控制会话；
    所述控制面网元根据接收到的所述策略控制会话删除请求消息向所述第一转发面网元发送业务策略规则删除请求消息，所述业务策略规则删除请求消息用于指示所述第一转发面网元删除所述第一DN连接对应的第三业务策 略规则。
  7. 一种策略控制方法，其特征在于，用户设备UE具有以第一转发面网元为锚点的第一数据网络DN连接，所述方法包括：
    第二转发面网元更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元；
    所述第二转发面网元对更新后的所述第一DN连接的报文进行策略控制。
  8. 如权利要求7所述的方法，其特征在于，所述第二转发面网元对更新后的所述第一DN连接的报文进行策略控制，包括：
    所述第二转发面网元接收控制面网元发送的会话建立请求消息或重定向响应消息，根据所述会话建立请求消息或重定向响应消息从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
    所述第二转发面网元接收所述控制面网元发送的更新后的所述第一DN连接对应的所述第一业务策略规则；所述第二转发面网元根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制。
  9. 如权利要求8所述的方法，其特征在于，所述方法还包括：
    所述第二转发面网元从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则；
    所述第二转发面网元从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则和所述第二DN连接对应的第二业务策略规则，包括：
    所述第二转发面网元建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
    所述第二转发面网元建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话获取所述第二DN连接对应的第二业务策略规则。
  10. 如权利要求7至9中任一项所述的方法，其特征在于，所述第二转发面网元更新所述第一DN连接的转发路径，包括：
    所述第二转发面网元接收控制面网元发送的会话建立请求消息，根据所述会话建立请求消息建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，通过所述控制面网元建立与为所述UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径；或者，
    所述第二转发面网元接收所述控制面网元发送的第二报文转发策略，以使所述第二转发面网元根据所述第二报文转发策略、所述第一转发面网元根据从所述控制面网元接收的第一报文转发策略，建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径；所述第二转发面网元根据所述第二报文转发策略、为所述UE提供服务的基站根据从所述控制面网元接收的第三报文转发策略，建立与所述第一DN连接对应的所述第二转发面网元与所述基站之间的报文转发路径。
  11. 一种策略控制方法，其特征在于，用户设备UE具有以第一转发面网元为锚点的第一数据网络DN连接，所述方法包括：
    策略决策网元接收控制面网元或第二转发面网元发送的第一策略控制会话建立请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识；
    所述策略决策网元根据所述第一策略控制会话建立请求消息向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则，所述第一业务策略规则用于对所述第一DN连接的报文进行策略控制。
  12. 如权利要求11所述的方法，其特征在于，所述方法还包括：
    所述第一策略控制会话建立请求消息中还携带第二DN连接的连接标识，所述第二DN连接以所述第二转发面网元为锚点；所述策略决策网元根据所述第一策略控制会话建立请求消息向所述第二转发面网元或所述控制面网元发送所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制；或者，
    所述策略决策网元接收所述第二转发面网元或者所述控制面网元发送的策略控制会话请求消息，所述策略控制会话请求消息中携带所述第二DN连接标识；根据所述策略控制会话请求消息向所述第二转发面网元或者所述控 制面网元发送与所述第二DN连接对应的第二业务策略队则，所述第二业务策略规则用于对所第二DN连接的报文进行策略控制；或者，
    所述策略决策网元接收所述第二转发面网元或者所述控制面网元发送的第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；根据所述第二策略控制会话建立请求消息向所述第二转发面网元或者所述控制面网元发送与所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制。
  13. 如权利要求11或12所述的方法，其特征在于，所述策略决策网元根据所述第一策略控制会话建立请求消息向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则之后，所述方法还包括：
    所述策略决策网元向所述第一转发面网元或者所述控制面网元发送策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述第一转发面网元与所述策略决策网元之间的策略控制会话或者删除所述控制面网元与所述策略决策网元之间的策略控制会话。
  14. 一种控制面网元，其特征在于，所述控制面网元为用户设备UE建立了以第一转发面网元为锚点的第一数据网络DN连接；所述控制面网元包括：接收单元和处理单元；
    所述接收单元，用于接收其他网元发送的消息或指令；
    所述处理单元，用于当所述接收单元接收到所述UE的切换通知消息，确定由第二转发面网元为所述UE服务时，或当为所述UE建立以第二转发面网元为锚点的第二DN连接时，更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元，由所述第二转发面网元对所述第一DN连接的报文进行策略控制。
  15. 如权利要求14所述的控制面网元，其特征在于，所述控制面网元还包括发送单元；
    所述发送单元，用于向其他网元发送消息或指令；
    在更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元之后，所述处理单元还用于：
    指示所述发送单元向所述第二转发面网元发送会话建立请求消息或重定 向响应消息，所述会话建立请求消息或重定向响应消息用于指示所述第二转发面网元从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
    指示所述接收单元从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则；指示所述发送单元将所述第一业务策略规则发送给所述第二转发面网元，所述第一业务策略规则用于对更新后的所述第一DN连接的报文进行策略控制。
  16. 如权利要求15所述的控制面网元，其特征在于，所述处理单元还用于：
    指示所述接收单元从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则；
    所述处理单元具体用于：
    建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
    建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话获取所述第二DN连接对应的第二业务策略规则。
  17. 如权利要求14至16中任一项所述的控制面网元，其特征在于，所述处理单元具体用于：
    指示所述发送单元向所述第二转发面网元发送会话建立请求消息，所述会话建立请求消息用于指示所述第二转发面网元建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，指示所述第二转发面网元通过所述控制面网元建立与为所述UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径；或者，
    指示所述发送单元向所述第一转发面网元发送第一报文转发策略，向所述第二转发网元发送第二报文转发策略，向为所述UE提供服务的基站发送第三报文转发策略，所述第一报文转发策略、所述第二报文转发策略及所述第三报文转发策略用于建立与所述第一DN连接对应的所述第一转发面网元与 所述第二转发面网元之间的报文转发路径及所述第二转发面网元与所述基站之间的报文转发路径。
  18. 如权利要求15或16所述的控制面网元，其特征在于，在所述从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则之后，所述处理单元还用于：
    指示所述接收单元接收所述策略决策网元发送的策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述控制面网元与所述策略决策网元之间的策略控制会话；
    根据接收到的所述策略控制会话删除请求消息指示所述发送单元向所述第一转发面网元发送业务策略规则删除请求消息，所述业务策略规则删除请求消息用于指示所述第一转发面网元删除所述第一DN连接对应的第三业务策略规则。
  19. 一种转发面网元，其特征在于，所述转发面网元为第二转发面网元，用户设备UE具有以第一转发面网元为锚点的第一数据网络DN连接，所述第二转发面网元包括：
    处理单元，用于更新所述第一DN连接的转发路径，使更新后的所述第一DN连接的转发路径经过所述第二转发面网元；对更新后的所述第一DN连接的报文进行策略控制。
  20. 如权利要求19所述的转发面网元，其特征在于，所述转发面网元还包括接收单元；
    所述接收单元，用于接收其他网元发送的消息或指令；
    所述处理单元具体用于：
    指示所述接收单元接收控制面网元发送的会话建立请求消息或重定向响应消息，根据所述会话建立请求消息或重定向响应消息从策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制；或者，
    指示所述接收单元接收所述控制面网元发送的更新后的所述第一DN连接对应的所述第一业务策略规则；根据所述第一业务策略规则对更新后的所述第一DN连接的报文进行策略控制。
  21. 如权利要求20所述的转发面网元，其特征在于，所述处理单元还用 于：
    指示所述接收单元从所述策略决策网元获取所述第二DN连接对应的第二业务策略规则；
    所述处理单元具体用于：
    建立与所述策略决策网元之间的一个策略控制会话，通过所述一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则以及所述第二DN连接对应的第二业务策略规则；或者，
    建立与所述策略决策网元之间的两个策略控制会话，通过所述两个策略控制会话其中一个策略控制会话从所述策略决策网元获取更新后的所述第一DN连接对应的第一业务策略规则，以及通过所述两个策略控制会话中的另一个策略控制会话获取所述第二DN连接对应的第二业务策略规则。
  22. 如权利要求19至21中任一项所述的转发面网元，其特征在于，所述转发面网元还包括发送单元；
    所述发送单元，用于向其他网元发送消息或指令；
    所述处理单元具体用于：
    指示所述接收单元接收控制面网元发送的会话建立请求消息，根据所述会话建立请求消息建立与所述第一转发面网元之间的与所述第一DN连接对应的报文转发路径，以及，通过所述控制面网元建立与为所述UE提供服务的基站之间的与所述第一DN连接对应的报文转发路径；或者，
    指示所述接收单元接收所述控制面网元发送的第二报文转发策略，以使所述第二转发面网元根据所述第二报文转发策略、所述第一转发面网元根据从所述控制面网元接收的第一报文转发策略，建立与所述第一DN连接对应的所述第一转发面网元与所述第二转发面网元之间的报文转发路径；所述第二转发面网元根据所述第二报文转发策略、为所述UE提供服务的基站根据从所述控制面网元接收的第三报文转发策略，建立与所述第一DN连接对应的所述第二转发面网元与所述基站之间的报文转发路径。
  23. 一种策略决策网元，其特征在于，用户设备UE具有以第一转发面网元为锚点的第一数据网络DN连接，所述策略决策网元包括：接收单元、发送单元和处理单元；
    所述接收单元，用于接收其他网元发送的消息或指令；
    所述发送单元，用于向其他网元发送消息或指令；
    所述处理单元，用于指示所述接收单元接收控制面网元或第二转发面网元发送的第一策略控制会话建立请求消息，所述第一策略控制会话建立请求消息中携带所述第一DN连接的连接标识；
    根据所述第一策略控制会话建立请求消息指示所述发送单元向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则，所述第一业务策略规则用于对所述第一DN连接的报文进行策略控制。
  24. 如权利要求23所述的策略决策网元，其特征在于，所述处理单元还用于：
    所述第一策略控制会话建立请求消息中还携带第二DN连接的连接标识，所述第二DN连接以所述第二转发面网元为锚点；根据所述第一策略控制会话建立请求消息指示所述发送单元向所述第二转发面网元或所述控制面网元发送所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制；或者，
    指示所述接收单元接收所述第二转发面网元或者所述控制面网元发送的策略控制会话请求消息，所述策略控制会话请求消息中携带所述第二DN连接标识；根据所述策略控制会话请求消息指示所述发送单元向所述第二转发面网元或者所述控制面网元发送与所述第二DN连接对应的第二业务策略队则，所述第二业务策略规则用于对所第二DN连接的报文进行策略控制；或者，
    指示所述接收单元接收所述第二转发面网元或者所述控制面网元发送的第二策略控制会话建立请求消息，所述第二策略控制会话建立请求消息中携带所述第二DN连接的连接标识；根据所述第二策略控制会话建立请求消息指示所述发送单元向所述第二转发面网元或者所述控制面网元发送与所述第二DN连接对应的第二业务策略规则，所述第二业务策略规则用于对所述第二DN连接的报文进行策略控制。
  25. 如权利要求23或24所述的策略决策网元，其特征在于，所述处理单元还用于：在执行所述根据所述第一策略控制会话建立请求消息向所述第二转发面网元或所述控制面网元发送与第一DN连接对应的第一业务策略规则之后，指示所述发送单元向所述第一转发面网元或者所述控制面网元发送策略控制会话删除请求消息，所述策略控制会话删除请求消息用于删除所述 第一转发面网元与所述策略决策网元之间的策略控制会话或者删除所述控制面网元与所述策略决策网元之间的策略控制会话。
  26. 一种策略控制系统，其特征在于，所述系统包括：如权利要求14至18中任一项所述的控制面网元、如权利要求19至22中任一项所述的转发面网元、如权利要求23至25中任一项所述的策略决策网元。
  27. 一种存储程序的计算机可读存储介质，其特征在于，所述程序包括指令，所述指令当被控制面网元执行时，使所述控制面网元执行根据权利要求1-6任一项所述的方法。
  28. 一种存储程序的计算机可读存储介质，其特征在于，所述程序包括指令，所述指令当被转发面网元执行时，使所述转发面网元执行根据权利要求7-10任一项所述的方法。
  29. 一种存储程序的计算机可读存储介质，其特征在于，所述程序包括指令，所述指令当被策略决策网元执行时，使所述策略决策网元执行根据权利要求11-13任一项所述的方法。
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