WO2016074454A1

WO2016074454A1 - Optimal switching method supporting multiple pdn connections, and corresponding network node

Info

Publication number: WO2016074454A1
Application number: PCT/CN2015/078697
Authority: WO
Inventors: 井惟栋; 赵静波; 吕凯; 丰孝英
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-11-11
Filing date: 2015-05-11
Publication date: 2016-05-19
Also published as: CN105578539A

Abstract

An optimal switching method supporting multiple PDN connections, and a corresponding network node. The method comprises: for each PDN connection established by a UE using the same access point name (APN), sending, by an HSGW, a request message to a PDN gateway, so as to request corresponding generic routing encapsulation key (GRE KEY) information for the PDN connection; after the PDN gateway receives the request message, carrying, in a response message returned to the HSGW, the GRE KEY information corresponding to the PDN connection; and after the HSGW receives the response message, saving the GRE KEY information corresponding to the PDN connection.

Description

Method for optimizing switching of multiple PDN connections and corresponding network nodes

Technical field

This paper deals with the field of communications, and in particular relates to an optimized handover processing method supporting multiple PDN connections and corresponding network nodes.

Background technique

The fourth-generation mobile communication network, Long Time Evolution (LTE), has also been widely deployed. The coexistence of the LTE network and the evolved High Rate Packet Data (eHRPD) network must last for a long period of time, which requires interoperability between the two. Figure 1 shows the related technologies of LTE and eHRPD interoperability. As shown in Figure 1, the user equipment (User Equipment, UE for short) 106 can be quickly switched between the two networks. In the LTE network and the eHRPD network, in order to ensure the Quality of Service (QoS) of the data service, a corresponding dedicated bearer is created for the data service with different QoS requirements. When switching between the LTE network and the eHRPD network, the dedicated bearer already established in the source network needs to be restored in the destination network.

To accelerate the handover process from LTE to eHRPD, the 3GPP (3rd Generation Partnership Project) and 3GPP2 related protocols define the optimized handover function of LTE to eHRPD. According to the description of 3GPP2 X.S0057-B vl.O 12, the optimized handover of LTE to eHRPD includes a pre-registration process and an actual handover procedure. Shorten the time for the mobile terminal to interrupt service during mobile eHRPD from LTE by increasing pre-registration. An S101 tunnel exists between the Mobility Management Entity (MME) and the evolved Access Network/evolved Packet Control Function (eAN/ePCF) 111. There is an S103 tunnel between the Serving Gateway (SGW) 104 and the HRPD Serving Gateway (HSGW) 110.

Pre-registration process. When the UE 106 is still under LTE, based on the triggering of the radio layer, the pre-registration process is initiated through the S101 tunnel. In the process of pre-registration, the AGW connection is established on the HSGW 110, the PPP session is established, and the authentication process is completed; the group that has been established under the LTE network A Data Network (PDN) connection is also created under eHRPD. The actual switching process. After the UE 106 reaches the eHRPD coverage, the HSGW 110 and the PDN Gateway 105 establish a PMIPv6 (Proxy Mobile IPv6) session, and the uplink and downlink data paths are modified to be transmitted between the HSGW 110 and the PDN Gateway 105. The resources of the UE 106 under the LTE network are released.

2 is a flowchart of an optimized handover pre-registration of the related art. As shown in FIG. 2, the process includes the following steps: Step 201: The UE 106 successfully accesses the LTE network, detects a wireless signal under the eHRPD, and tunnels through the S101. eHRPD is pre-registered;

Step 202, the eAN/ePCF 111 sends an All RRQ (Registration Request) to the HSGW 110, carries a tunnel mode field, and has a value of 1 (a value of 1 indicates that the UE 106 is transmitting an signaling to the eHRPD network through the S101 tunnel under the LTE network);

Step 203, the HSGW 110 receives the All RRQ, according to the value of the tunnel mode field, it can be known that the pre-registration starts, and the All RRP (registration response) is returned to the eAN/ePCF 111;

Step 204: The UE 106, the HSGW 110 completes LCP (Link Control Protocol) negotiation, the UE,

The HSGW 110 and the 3GPP2 AAA Proxy (3GPP2 Authentication Authorization Charging Proxy Server) 108 complete the authentication process, and the HSGW 110 stores the LCP and authentication information. The 3GPP2 AAA Proxy 108 is to perform the authentication 4 authorization function for the UE 106 together with the 3GPP AAA Server (3GPP Authentication Authorization Accounting Server) 107 and the Home Subscriber Server (HSS) 101; Step 205, UE 106 Initiating a device-defined network control protocol with HSGW 110

( Vendor Specific Network Control Protocol, VSNCP for short) negotiation. The UE 106 carries the identification information of the UE and the APN and the address of the UE in the VSNCP configuration request, and carries the IPv6 interface ID if there is an IPv6 service; and carries the IPv4 address if there is an IPv4 service; if multiple PDN connections are established by using one APN , carrying the PDN connection identifier (the field name user context identifier in the VSNCP protocol: User Context Identifier ).

Step 206: The HSGW 110 initiates a request for establishing a gateway control session to a Policy and Charging Rules Function (PCRF) 102.

Step 207, the PCRF 102 returns a response message for establishing a request for the gateway control session; Step 208: The HSGW 110 sends a VSNCP configuration response message to the UE 106. Step 209, the HSGW 110 sends a VSNCP configuration request message to the UE 106.

Step 210: The UE 106 sends a VSNCP configuration response message to the HSGW 110 to complete the VSNCP negotiation process between the UE 106 and the HSGW 110. Since the HSGW 110 receives the value of the tunnel mode field in the All RRQ, the HSGW 110 does not and the PDN. The gateway 105 performs PBU/PBA signaling interaction to establish a PMIPv6 session.

Step 211: The PCRF 102 initiates a process of establishing a dedicated bearer on the network side to restore the dedicated bearer that the UE 106 has established under the LTE. To this end, the PCRF 102 initiates a gateway control and a Qos rule delivery request message;

Step 212: The HSGW 110 returns a gateway control and a Qos rule delivery response message to the PCRF 102.

Step 213: The HSGW 110 receives the message of the PCRF 102, and sends a Resource Reservation Protocol (RSVP) Resv message to the UE 106. The TFT operation code is a flow establishment request.

Step 214: The UE 106 sends an RSVP Resv message requesting to install the TFT.

In step 215, the HSGW 110 sends an RSVP Resv conf message to the UE 106 to complete the negotiation. Step 216 is triggered by step 213. The eAN/ePCF 111 and the HSGW 110 establish a flow and a new A10 secondary connection through the All message as needed; 110 has established the context of the UE 106, and the proprietary bearer has also been established;

Step 218, after the pre-registration is completed, the UE 106 does not necessarily switch to the eHRPD very quickly. when

The UE 106 has an increase, a modification, and a deletion of the PDN connection under the LTE, and the UE 106 performs VSNCP negotiation through the tunnel and the HSGW 110 to update the session. Similarly, PCRF 102 also initiates the addition, deletion, and update of proprietary bearers to ensure synchronization with LTE.

FIG. 3 is a flow chart of optimizing switching (ie, actual switching) in an active state of the related art, as shown in FIG.

As shown in 3, the process includes the following steps:

Step 301: After completing the pre-registration, the UE 106 prepares to switch to the eHRPD. Step 302, the UE 106 sends an HRPD (High Speed Packet Data) connection request message to the E-UTRAN.

(Evolved Universal Land-Based Radio Access Network) requests to establish a transport channel. The request is forwarded to the MME. Step 303: The MME sends the GRE KEY information corresponding to the APN to the eAN/ePCF 111 through the HRPD connection request message.

Step 304: The eAN/ePCF 111 sends an Al 1 RRQ to the HSGW 110, carries a tunnel mode field, has a value of 1, and carries a PDN gateway 105 address, APN (Access Point Name), GRE KEY.

(general routing encapsulation key) information;

Step 305, the HSGW 110 receives the All RRQ, and responds to the All RRP message, and carries the address of the HSGW 110, the GRE KEY information of the APN, S103 tunnel;

Step 306, the eAN/ePCF 111 sends an HRPD service channel allocation message to the MME, carrying

Address of HSGW 110, GRE KEY information of APN, S103 tunnel;

Step 307: The MME forwards the traffic channel assignment message to the E-UTRAN. This message sneaked into the S 101 tunnel message. This message will be forwarded to the UE 106. After the foregoing process is completed, after the downlink data arrives at the SGW from the PDN gateway 105, the SGW forwards the packet to the HSGW 110 through the S103 tunnel, and the HSGW 110 transmits the network element to the eAN/ePCF 111;

In step 308, the UE 106 switches to the wireless network of the eHRPD network. At this time, if the UE 106 sends the uplink data, the HSGW 110 may send the uplink data of the UE 106 to the PDN gateway 105 according to the information obtained from the All RRQ in step 305.

Step 309, the eAN/ePCF 111 sends an Al 1 RRQ to the HSGW 110, and carries a tunnel mode field, and the value is 0, indicating that the UE 106 is under the eHRPD wireless;

Step 310, the HSGW 110 returns an All RRP message to the eAN/ePCF 111;

Step 311, triggered by step 309, the HSGW 110 sends a PBU message to the PDN gateway 105. Step 312, the PDN gateway 105 returns a response message PBA, carrying information such as GRE KEY; Step 313, if the UE 106 starts to be established under LTE, A completed PDN connection is established, and the UE 106 initiates establishment of the PDN connection under the eHRPD. At this point, the optimization switching process is completed.

As can be seen from the pre-registration described above, as well as the optimized switching process in the active state, HSGW 110 After step 308, the uplink data can be forwarded without waiting for step 312. This is because, in step 305, the HSGW 110 obtains the GRE KEY corresponding to the PDN connection. When the uplink data is received, the PDN connection of the user is found according to the APN, and the GRE KEY can be used to send to the PDN gateway. Unfortunately, when multiple PDN connections are established under the same APN, it is impossible to forward because the GRE KEY of the PDN connection cannot be determined according to the APN information. Until step 312, after receiving the PBA, the HSGW 110 can obtain the GRE KEY of each PDN connection, so that the uplink data can be normally forwarded.

Therefore, in the related art, there is a defect that the uplink data interruption time is long when the UE establishes a plurality of PDN connections under the same APN in the process of optimizing handover to the eHRPD. Summary of the invention

In view of this, the embodiments of the present invention provide a method for supporting optimized handover of a PDN connection of a multi-packet data network, which is applied to an evolved high-speed packet data serving gateway HSGW, and the method includes: in a long-term evolution system LTE network to an evolved type In the pre-registration process of the optimized handover of the high-speed packet data eHRPD network, the HSGW sends a request message to the PDN gateway for each PDN connection established by the user equipment UE with the same access point name APN, and the corresponding general route encapsulation for the PDN connection request. Key GRE KEY information;

The HSGW receives the response message returned by the PDN gateway for the request message, and saves the GRE KEY information corresponding to the PDN connection carried in the response message.

Optionally,

The request message is a proxy binding update PBU message, and the PBU message carries pre-registration indication information and identifier information that uniquely identifies the PDN connection, where the pre-registration indication information is used to indicate that the PBU message is in the pre-registration process of optimizing handover. Sent in.

Optionally,

The pre-registration indication information is a vendor-defined mobile option separately defined in the PBU message; or, is a newly added value of the handover indication field already existing in the PBU message.

Optionally,

Sending, by the HSGW, a request message to the PDN gateway, corresponding to the PDN connection request GRE KEY information, including:

And the HSGW receives the VSNCP configuration request sent by the UE, and the VSNCP configuration request carries the unique identifier in the VGWCP negotiation process, where the HSGW and the UE perform the device-defined network control protocol VSNCP negotiation for the PDN connection. The identifier information of the PDN connection, the identifier information that uniquely identifies the PDN connection includes: identifier information of the UE, the APN, and identifier information of the PDN connection;

The HSGW sends a PBU message to the PDN gateway, and carries the pre-registration indication information and the identifier information that uniquely identifies the PDN connection.

Optionally,

The method further includes: in the actual handover process initiated by the UE after the pre-registration process, if the HSGW receives the uplink data of the PDN connection sent by the UE, according to the saved GRE corresponding to the PDN connection The KEY information is encapsulated into the GRE tunnel and sent to the corresponding PDN gateway.

In view of this, the embodiment of the present invention further provides a method for supporting an optimized handover of a PDN connection of a multi-packet data network, which is applied to a packet data network PDN gateway, and the method includes:

In the pre-registration process of the optimized handover of the LTE network to the evolved high-speed packet data eHRPD network, the PDN gateway receives the request message sent by the evolved high-speed packet data serving gateway HSGW, and the request message is used to request a PDN connection Corresponding universal routing encapsulation key GRE KEY information;

The PDN gateway returns a response message to the HSGW, where the response message carries the GRE KEY information corresponding to the PDN connection.

Optionally,

The request message is a proxy binding update PBU message, and the PBU message carries pre-registration indication information and identifier information that uniquely identifies the PDN connection, where the pre-registration indication information is used to indicate that the PBU message is in the pre-registration process of optimizing handover. Sent in

The response message is a proxy binding acknowledgement PBA message, and the PBA message carries the identifier information that uniquely identifies the PDN connection and the GRE KEY information corresponding to the PDN connection. In view of this, the embodiment of the present invention further provides a method for supporting optimized handover of a PDN connection of a multi-packet data network, which is applied to a pre-registration process of an optimized handover of a long-term evolution system LTE network to an evolved high-speed packet data eHRPD network. The methods include:

For each PDN connection established by the user equipment UE with the same access point name APN, the following processing is performed:

The evolved high-speed packet data service gateway HSGW sends a request message to the PDN gateway, and requests a corresponding general routing encapsulation key GRE KEY information for the PDN connection;

After receiving the request message, the PDN gateway carries the GRE KEY information corresponding to the PDN connection in the response message returned to the HSGW;

After receiving the response message, the HSGW saves the GRE KEY information corresponding to the PDN connection.

Optionally,

The response message is a proxy binding acknowledgement PBA message, and the PBA message carries the identifier information uniquely identifying the PDN connection and the GRE KEY information.

Optionally,

The pre-registration indication information is a vendor-defined mobile option separately defined in the PBU message; or

The pre-registration indication information is a newly added value of a handover indication field already existing in the PBU message.

Optionally,

Sending, by the HSGW, a request message to the PDN gateway, corresponding to the PDN connection request

GRE KEY information, including:

Network control defined by the HSGW and the device vendor for the PDN connection During the VSNCP negotiation process, the HSGW receives the VSNCP configuration request sent by the UE, where the VSNCP configuration request carries the identifier information that uniquely identifies the PDN connection, and includes the identifier information of the UE and the information of the APN. Identification information connected to the PDN;

The HSGW sends a PBU message to the PDN gateway, carrying pre-registration indication information and identification information uniquely identifying the PDN connection.

Optionally,

The method further includes: in the actual handover process initiated by the UE after the pre-registration process, if the HSGW receives uplink data of a PDN connection sent by the UE, the HSGW connects according to the saved PDN. Corresponding GRE KEY information, the uplink data is encapsulated into a GRE tunnel and sent to a corresponding PDN gateway.

In view of this, the embodiment of the present invention further provides an evolved high-speed packet data serving gateway HSGW, including a first pre-registration processing module for optimizing switching of a long-term evolution system LTE network to an evolved high-speed packet data eHRPD network, where A pre-registration processing module includes:

The information requesting unit is configured to send a request message to the packet data network gateway PDN gateway for each PDN connection established by the user equipment UE with the same access point name APN, and request a corresponding general routing encapsulation key GRE KEY information for the PDN connection;

The information storage unit is configured to receive a response message returned by the PDN gateway for the request message, and save GRE KEY information corresponding to the PDN connection carried in the response message.

Optionally,

The request message sent by the information requesting unit to the PDN gateway is a proxy binding update PBU message, where the PBU message carries pre-registration indication information and identifier information that uniquely identifies the PDN connection, where the pre-registration indication information is used to indicate the PBU. The message is sent in the pre-registration process of the optimized handover, and the pre-registration indication information is a vendor-defined mobile option separately defined in the PBU message, or a newly added value of the handover indication field already existing in the PBU message.

Optionally,

The HSGW further includes: an actual handover processing module for optimizing handover of the LTE network to the eHRPD network, where the actual handover processing module includes: The uplink data forwarding unit is configured to: according to the GRE KEY information of the saved PDN connection, if the uplink data of the PDN connection sent by the UE is received during the actual handover process initiated by the UE after the pre-registration process, The uplink data is encapsulated into a GRE tunnel and sent to a corresponding PDN gateway.

In view of this, the embodiment of the present invention further provides a packet data network PDN gateway, including a second pre-registration processing module for optimizing switching of a long-term evolution system LTE network to an evolved high-speed packet data eHRPD network, where the second pre-registration Processing modules include:

a message receiving unit, configured to receive a request message sent by the evolved high-speed packet data serving gateway HSGW, where the request message is used to request a corresponding universal routing encapsulation key GRE KEY information for a PDN connection;

The message response unit is configured to: after receiving the request message, return a response message to the HSGW, where the response message carries the GRE KEY information corresponding to the PDN connection.

Optionally,

The request message received by the message receiving unit is a proxy binding update PBU message, and the PBU message carries pre-registration indication information and identifier information that uniquely identifies the PDN connection, where the pre-registration indication information is used to indicate a PBU message. Is sent in the pre-registration process of the optimized handover; the response message returned by the message response unit to the HSGW is a proxy binding acknowledgement PBA message, where the PBA message carries the identifier information that uniquely identifies the PDN connection and the PDN Connect the corresponding GRE KEY information.

Correspondingly, the embodiment of the present invention further provides a system for supporting optimized handover of a PDN connection of a multi-packet data network, including an evolved high-speed packet data eHRPD network and a long-term evolution system LTE network, where the evolved type in the eHRPD network The high-speed packet data service gateway HSGW uses the above-mentioned HSGW provided by the embodiment of the present invention; the packet data network PDN gateway in the LTE network uses the above-mentioned PDN gateway provided by the embodiment of the present invention.

The above solution can overcome the UE optimization in the related art to switch to eHRPD when present When a plurality of PDN connections are established by using one APN, the uplink data interruption time is long, which provides a fast recovery of data services when the UE switches from LTE optimization to eHRPD. BRIEF abstract

The drawings described herein are provided to provide a further understanding of the embodiments of the invention, and are not to be construed as limiting. In the drawing:

FIG. 1 is a schematic diagram of a related art LTE and eHRPD interoperation network architecture;

2 is a signaling flowchart of an optimized handover pre-registration of the related art;

FIG. 3 is a signaling flowchart of optimizing handover in an active state of the related art; FIG.

4 is a flowchart of an optimized handover pre-registration performed by an HSGW according to an embodiment of the present invention; FIG. 5 is a flowchart of an optimized handover pre-registration performed by a PDN gateway according to an embodiment of the present invention; FIG. 6 is an embodiment of the present invention supporting optimization of multiple PDN connections. FIG. 7 is a signaling flowchart of an optimized handover pre-registration supporting multiple PDN connections according to an embodiment of the present invention; FIG. 8 is a structural diagram of a pre-registration indication mobility option according to an embodiment of the present invention;

9 is a block diagram of an HSGW according to an embodiment of the present invention; and

Figure 10 is a block diagram of a PDN gateway in accordance with an embodiment of the present invention. Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

This embodiment is implemented on the basis of the 3GPP2 and 3GPP protocol definition optimization switching functions, by improving the optimization handover process. According to the analysis of the related art, the reason for the shortcoming of the uplink data interruption time is that when multiple PDN connections are established under the same APN, the HSGW 110 cannot obtain the corresponding GRE KEY on the PDN connection (the GRE KEY in the text) It means that the HSGW uses GRE KEY when sending data to the PDN gateway. In different standards, it is also called PDN gateway GRE KEY or uplink GRE KEY. The corresponding GRE KEY of the PDN connection is the PDN gateway 105. One method of allocating this problem is that the HSGW 110 requests the GRE KEY information from the PDN gateway 105.

As shown in FIG. 4, the method for supporting the optimized handover of the multiple PDN connections performed by the HSGW in this embodiment includes:

Step 110: In the pre-registration process of the optimized handover of the LTE network to the eHRPD network, the HSGW sends a request message to the PDN gateway for each PDN connection established by the UE with the same access point name APN, and the corresponding general request for the PDN connection request. Routing encapsulation key GRE KEY information;

Optionally, the request message is a Proxy Binding Update (PBU) message, where the PBU message carries pre-registration indication information and identifier information that uniquely identifies the PDN connection, where the pre-registration indication information is used to indicate the PBU. The message is sent during the pre-registration process of the optimized switch. The pre-registration indication information may be a vendor-defined mobile option separately defined in the PBU message, or a newly added value of the handover indication field already existing in the PBU message.

In this embodiment, optionally, the HSGW sends a request message to the PDN gateway, and the GRE KEY information corresponding to the PDN connection request includes:

And the HSGW receives the VSNCP configuration request sent by the UE, and the VSNCP configuration request carries the unique identifier in the VGWCP negotiation process, where the HSGW and the UE perform the device-defined network control protocol VSNCP negotiation for the PDN connection. Identification information of the PDN connection, where the identifier information of the UE, the APN, and the identifier information of the PDN connection are included;

Step 120: The HSGW receives the response message returned by the PDN gateway for the request message, and saves the GRE KEY information corresponding to the PDN connection carried in the response message.

In this embodiment, optionally, the response message is a Proxy Binding Acknowledgement (PBA) message, and the PBA message carries the identifier information that uniquely identifies the PDN connection and the GRE KEY information.

In the actual handover process initiated by the UE after the pre-registration process, if the HSGW receives the uplink data of the PDN connection sent by the UE, the HSGW, according to the saved GRE KEY information of the PDN connection, Encapsulating the uplink data into a GRE tunnel and sending it to the pair The PDN gateway should be used to complete the timely forwarding of uplink data.

As shown in FIG. 5, the method for supporting optimal switching of multiple PDN connections performed by the PDN gateway in this embodiment includes:

Step 210: In the pre-registration process of the optimized handover of the LTE network to the eHRPD network, the PDN gateway receives the request message sent by the HSGW, where the request message is used to request a corresponding general routing encapsulation key GRE KEY information for a PDN connection;

Optionally, the request message is a proxy binding update PBU message, where the PBU message carries pre-registration indication information and identifier information that uniquely identifies the PDN connection, where the pre-registration indication information is used to indicate that the PBU message is in an optimized handover. Sent during the pre-registration process.

Step 220: The PDN gateway returns a response message to the HSGW, and carries the GRE KEY information corresponding to the PDN connection in the response message.

Optionally, the response message is a proxy binding acknowledgement PB A message, and the PB A message carries the identifier information that uniquely identifies the PDN connection and the GRE KEY information corresponding to the PDN connection.

Correspondingly, the process of the optimized handover pre-registration supporting the multiple PDN connections in the embodiment of the present invention is as shown in FIG. 6. In the pre-registration process of the optimized handover of the LTE network to the eHRPD network, the same access point name APN is used for the user equipment UE. For each PDN connection established, perform the following processing:

Step 310: The HSGW sends a request message to the PDN gateway, and the corresponding general routing encapsulation key GRE KEY information is requested for the PDN connection.

Optionally, the request message is a proxy binding update PBU message, where the PBU message carries pre-registration indication information and identifier information that uniquely identifies the PDN connection, where the pre-registration indication information is used to indicate that the PBU message is in an optimized handover. Sent during the pre-registration process. Correspondingly, the response message is a proxy binding acknowledgement PBA message, and the PBA message carries identification information and the GRE KEY information that uniquely identifies the PDN connection. The pre-registration indication information is a vendor-defined mobile option separately defined in the PBU message; or the pre-registration indication information is a newly added value of the handover indication field already existing in the PBU message.

The step may include: a device that performs the PDN connection between the HSGW and the UE During the VSNCP negotiation process, the HSGW receives the VSNCP configuration request sent by the UE, and the VSNCP configuration request carries the identifier information that uniquely identifies the PDN connection, including the identifier information of the UE, The information of the APN and the identifier information of the PDN connection. Then, the HSGW sends a PBU message to the PDN gateway, and carries the pre-registration indication information and the identifier information that uniquely identifies the PDN connection.

Step 320: After receiving the request message, the PDN gateway carries the GRE KEY information corresponding to the PDN connection in the response message returned to the HSGW.

Step 330: After receiving the response message, the HSGW saves the GRE KEY information corresponding to the PDN connection.

After the step, the HSGW receives the uplink data of the PDN connection sent by the UE, and the HSGW according to the saved PDN connection, in the actual handover process initiated by the UE after the pre-registration process. The GRE KEY information encapsulates the uplink data into a GRE tunnel and sends the corresponding data to the corresponding PDN gateway.

The signaling flow of the pre-registration of the optimized handover according to the present embodiment is as shown in FIG. 7 , including: Step 401: The UE 106 successfully accesses the LTE network, detects the wireless signal under the eHRPD, and performs pre-registration through the S101 tunnel to the eHRPD.

Step 402, the eAN/ePCF 111 sends an All RRQ (Registration Request) to the HSGW 110, carries a tunnel mode field, and has a value of 1 (a value of 1 indicates that the UE 106 is transmitting an signaling to the eHRPD network through the S101 tunnel under the LTE network);

Step 403, the HSGW 110 receives the All RRQ, according to the value of the tunnel mode field, it can be known that the pre-registration starts, and the All RRP (registration response) is returned to the eAN/ePCF 111;

Step 404: The UE 106, the HSGW 110 completes the LCP (Link Control Protocol) negotiation, and the UE, the HSGW 110, and the 3GPP2 AAA Proxy (3GPP2 Authentication Authorization Charging Proxy Server) 108 complete the authentication process, and the HSGW 110 saves the LCP and the authentication. information. The 3GPP2 AAA Proxy 108 is to perform the authentication 4 authorization function for the UE 106 together with the 3GPP AAA Server (3GPP Authentication Authorization Accounting Server) 107 and the Home Subscriber Server (HSS) 101; Step 405, UE 106 Initiating a device-defined network control protocol with HSGW 110 ( Vendor Specific Network Control Protocol, referred to as VSNCP) negotiation. The UE 106 carries the identification information and the APN of the UE in the VSNCP configuration request, and uses the address of the UE, if there is an IPv6 service, carries the IPv6 interface ID; if there is an IPv4 service, it carries the IPv4 address; if the UE establishes multiple PDNs with one APN Connection, carrying the identification field of the PDN connection.

The identification information of the UE, the identification information of the APN and the PDN connection constitute a unique identifier

Identification information of the PDN connection.

Step 406: The HSGW 110 initiates a request for establishing a gateway control session to a Policy and Charging Rules Function (PCRF) 102.

Step 407: The PCRF 102 returns a response message for establishing a request for the gateway control session. Step 408: The HSGW 110 sends a PBU message to the PDN gateway 105, and carries the pre-registration indication information and the identifier information that uniquely identifies a PDN connection.

The pre-registration indication information is used to indicate that the PBU message is sent during the pre-registration process of the optimized handover. By carrying the pre-registration indication information in the PBU message, the PBU sent during pre-registration can be distinguished from the PBU sent in other scenarios. By carrying the information that uniquely identifies a PDN connection in the PBU message, the UE can establish multiple PDN connections by using one APN, and can uniquely identify the PDN connection.

Step 409: The PDN gateway 105 receives the PBU message, and finds that the pre-registration indication information is carried, and the PMIPv6 session is not switched. The PBA message is returned as a response, and the identifier information of the unique identifier-PDN connection and the identifier information are unique. The corresponding GRE KEY information of the identified PDN connection.

The GRE KEY information corresponding to the PDN connection sent by the PDN gateway to the HSGW through the PBA message needs to be used when the HSGW sends the uplink data of the PDN connection of the UE through the GRE tunnel. After receiving the PBA message, the HSGW 110 saves the GRE KEY information corresponding to the PDN connection, such as saving to the context of the PDN connection.

Table 1 describes the PMIPv6 mobility options carried by PBA messages:

The IPv6 home network prefix carries the link-local address if the PDN is connected to the IPv6 address. If the PDN connection has an IPv6 address, it carries the handover indication access technology type timestamp universal routing encapsulation key (GRE).

KEY )

IPv4 home address reply If the PDN connection has an IPv4 address, it carries

IPv4 default router address If the PDN connection has an IPv4 address, it carries the service selection mobility option.

PDN connection identifier If it is an APN with multiple PDN connections

As shown in the above table, the identification information of the UE is written in the "Mobile Node Identity" field of the PBA message, the APN is written in the "Service Selection Mobile Option" field, and the identification information of the PDN connection is written in the "PDN Connection Identity" field. And together constitute the identification information that uniquely identifies a PDN connection. The "general routing encapsulation key" field is written with the GRE KEY information corresponding to the PDN connection uniquely identified by the identification information. PBA messages can also carry other information.

Step 410: The HSGW 110 sends a VSNCP configuration response message to the UE 106.

Step 411, the HSGW 110 sends a VSNCP configuration request message to the UE 106.

Step 412: The UE 106 sends a VSNCP configuration response message to the HSGW 110 to complete the VSNCP negotiation process between the UE 106 and the HSGW 110. Since the HSGW 110 receives the value of the tunnel mode field in the All RRQ, the HSGW 110 does not and the PDN. The gateway 105 performs PBU/PBA signaling interaction to establish a PMIPv6 session.

Step 413: The PCRF 102 initiates a process of establishing a dedicated bearer on the network side to recover the dedicated bearer that the UE 106 has established under the LTE. To this end, the PCRF 102 initiates a gateway control and a QoS rule delivery request message; Step 414, the HSGW 110 returns a gateway control and a QoS rule delivery response message to the PCRF 102.

Step 415: The HSGW 110 receives the message of the PCRF 102, and sends a Resource Reservation Protocol (RSVP) Resv message to the UE 106. The TFT operation code is a flow establishment request.

Step 416, the UE 106 sends an RSVP Resv message requesting to install the TFT.

Step 417, the HSGW 110 sends an RSVP Resv conf message to the UE 106 to complete the negotiation. Step 418, triggered by step 415, the eAN/ePCF 111 and the HSGW 110 establish a flow and a new A10 secondary connection through the All message as needed; 110 has established the context of the UE 106, and the proprietary bearer has also been established;

Steps 405 through 418 are a VSNCP negotiation process and a dedicated bearer setup procedure (optional) for a PDN connection. If the UE establishes multiple PDN connections with the same APN, the negotiation process of step 405 to step 418 is performed for each of the PDN connections. In each negotiation, the HSGW obtains a PDN connection from the PDN gateway in the foregoing manner. The GRE KEY information finally obtains the GRE KEY information corresponding to all the multiple PDN connections. If the UE establishes multiple PDN connections with multiple APNs, one or more PDN connections established by each APN may be processed in the same manner.

Step 419, after the pre-registration is completed, the UE 106 does not necessarily switch to the eHRPD very quickly. When the UE 106 has an increase, modification, and deletion of the PDN connection under the LTE, the UE 106 updates the session by performing VSNCP negotiation with the HSGW 110 through the tunnel. Similarly, PCRF 102 also initiates the addition, deletion, and update of proprietary bearers to ensure synchronization with LTE.

After the above steps 408 and 409 in the pre-registration process, the HSGW 110 can obtain the GRE KEY information corresponding to the PDN connection.

The process of optimizing the switching in the active state is the same as in Figure 2. After the embodiment of the present invention, after step 308 and before step 318, the HSGW 110 can process the uplink data sent by the UE 106 regardless of whether there are multiple PDN connections on the same APN, and after performing the correct GRE encapsulation, Sent to the PDN Gateway 105.

The mobility options carried in the PBU message in step 408 can be as shown in Table 2. Table 2 PBU carrying mobile options

In Table 2, the pre-registration indication information is a vendor-defined mobile option that is defined separately. Preferably, the separately defined vendor-defined mobile option may be defined as a specific vendor extended mobility option, ie, a pre-registration indication option, if the path is only carried in the PBU when the handover pre-registration is optimized, the structure may be referred to Figure 8, including:

Type=19, indicating vendor-defined mobile options;

Length=8

Vendor ID=3902, indicating a specific vendor

Subtype=l, expressed as a pre-registration indication option.

Data, always set to 0, ignores this field when receiving. In Table 2, the identification information of the UE is written in the "Mobile Node Identity" field, the APN is written in the "Service Selection Mobile Option" field, and the identification information of the PDN connection is written in the "PDN Connection Identity" field, which together constitute a unique identifier. Identification information of a PDN connection.

Preferably, the PBU message in step 408 can also be as shown in Table 3.

Table 3 PBU carrying mobile options

As shown in Table 3, the "pre-registration indication" multiplexes the existing handover indication option, and a new value is added to indicate that the scenario in which the PBU message is sent is "optimized handover pre-registration". The value of the handover indication field currently defined by RFC5213 is 0 to 5. The optimized handover pre-registration can be defined as 6 or any value other than 0 to 5.

Correspondingly, the embodiment provides an evolved high-speed packet data serving gateway HSGW, including an optimized handover of a long-term evolution system LTE network to an evolved high-speed packet data eHRPD network. a first pre-registration processing module, where, as shown in FIG. 9, the first pre-registration processing module includes: an information requesting unit 10 configured to set each PDN connection established by the UE with the same access point name APN, to the grouping The data network gateway PDN gateway sends a request message, requesting a corresponding universal routing encapsulation key GRE KEY information for the PDN connection;

The information storage unit 20 is configured to receive a response message returned by the PDN gateway for the request message, and save GRE KEY information corresponding to the PDN connection carried in the response message.

Optionally,

The information requesting unit sends a request message to the PDN gateway, and the GRE KEY information corresponding to the PDN connection request includes:

The information requesting unit receives a VSNCP configuration request sent by the UE, and the VSNCP configuration request carries a unique identifier PDN connection in a network control protocol VSNCP negotiation process defined by the device for the PDN connection. The information that the identifier information of the PDN connection is uniquely includes: the identifier information of the UE, the APN, and the identifier information of the PDN connection; and the information requesting unit sends a PBU message to the PDN gateway, where Pre-registration indication information and the information uniquely identifying the PDN connection.

Optionally,

The HSGW further includes: an actual handover processing module for optimizing handover of the LTE network to the eHRPD network, where the actual handover processing module includes:

The uplink data forwarding unit is configured to: according to the GRE KEY information of the saved PDN connection, if the uplink data of the PDN connection sent by the UE is received during the actual handover process initiated by the UE after the pre-registration process, The uplink data is encapsulated into a GRE tunnel and sent to a corresponding PDN gateway. Correspondingly, the embodiment further provides a packet data network gateway, including a long term evolution system.

The second pre-registration processing module of the LTE network to the optimized high-speed packet data eHRPD network, as shown in FIG. 10, the second pre-registration processing module includes:

The message receiving unit 50 is configured to receive a request message sent by the evolved high-speed packet data serving gateway HSGW, where the request message is used to request a corresponding general routing encapsulation key GRE KEY information for a PDN connection;

The message response unit 60 is configured to: after receiving the request message, return a response message to the HSGW, where the response message carries the GRE KEY information corresponding to the PDN connection.

Optionally,

Correspondingly, the embodiment further provides a system for supporting optimized handover of a PDN connection of a multi-packet data network, including an evolved high-speed packet data eHRPD network and a long-term evolution system LTE network, wherein the evolved high-speed in the eHRPD network The packet data service gateway HSGW uses the above-mentioned HSGW provided by this embodiment; the packet data network PDN gateway in the LTE network uses the above-mentioned PDN gateway provided in this embodiment.

It will be understood by those skilled in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented using an integrated circuit. The steps may be separately fabricated into individual integrated circuit modules, or multiple of the modules or steps may be implemented as a single integrated circuit module.

The various devices/function modules/functional units in the above embodiments may be implemented using a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

Each device/function module/functional unit in the above embodiments can be stored in a computer readable storage medium when implemented in the form of a software function module and sold or used as a standalone product. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Industrial practical, 1

The foregoing solution can overcome the defect that the UE is optimized to switch to the eHRPD in the related art, and when there are multiple PDN connections established by using one APN, the uplink data interruption time is long, and the data is provided when the UE switches from LTE optimization to eHRPD. Rapid recovery of business.

Claims

Claim

A method for supporting an optimized handover of a PDN connection in a multi-packet data network, which is applied to an evolved high-speed packet data serving gateway HSGW, the method comprising:

In the pre-registration process of the optimized handover of the LTE network to the evolved high-speed packet data eHRPD network, the HSGW sends a request message to the PDN gateway, corresponding to each PDN connection request established by the user equipment UE with the same access point name APN. Universal routing encapsulation key GRE KEY information;

2. The method of claim 1 wherein

3. The method of claim 2, wherein

4. The method of claim 2 or 3, wherein

The HSGW sends a request message to the PDN gateway, and the GRE KEY information corresponding to the PDN connection request includes:

5. The method of claim 1 or 2 or 3, further comprising:

In the actual handover process initiated by the UE after the pre-registration process, if the HSGW receives the uplink data of the PDN connection sent by the UE, the HSGW according to the saved GRE KEY information of the PDN connection, The uplink data is encapsulated into a GRE tunnel and sent to the corresponding PDN gateway.

6. A method for supporting optimized handover of a PDN connection in a multi-packet data network, applied to a packet data network PDN gateway, the method comprising:

7. The method of claim 6, wherein

The response message is a proxy binding acknowledgement PBA message, and the PBA message carries the identifier information that uniquely identifies the PDN connection and the GRE KEY information corresponding to the PDN connection.

The first pre-registration processing module includes:

The information requesting unit is configured to send a request message to the packet data network gateway PDN gateway, where the user equipment UE uses the common routing encapsulation key GRE KEY information corresponding to each PDN connection request established by the same access point name APN;

The information storage unit is configured to receive the response message returned by the PDN gateway for the request message, and save the GRE KEY information corresponding to the PDN connection carried in the response message.

9. The HSGW according to claim 8, wherein

The HSGW of claim 8 or 9, further comprising: an actual handover processing module for optimizing handover of the LTE network to the eHRPD network, where the actual handover processing module includes:

The uplink data forwarding unit is configured to: according to the GRE KEY information of the saved PDN connection, if the uplink data of the PDN connection sent by the UE is received during the actual handover process initiated by the UE after the pre-registration process, The uplink data is encapsulated into a GRE tunnel and sent to a corresponding PDN gateway.

A packet data network, a PDN gateway, including a second pre-registration processing module of the LTE network to the optimized high-speed packet data eHRPD network, and the second pre-registration processing module includes:

a message receiving unit, configured to receive a request message sent by the evolved high-speed packet data serving gateway HSGW, where the request message is used to request a corresponding general routing encapsulation key GRE KEY information for a PDN connection;

12. The PDN gateway of claim 11, wherein

13. A method for supporting optimized handover of a PDN connection in a multi-packet data network, which is applied to a pre-registration process of an optimized handover of a long-term evolution system LTE network to an evolved high-speed packet data eHRPD network, the method comprising:

14. The method of claim 13 wherein

15. The method of claim 14, wherein

16. The method according to claim 14 or 15, wherein

17. The method of any of claims 13 to 15, further comprising:

In the actual handover process initiated by the UE after the pre-registration process, if the HSGW receives the uplink data of the PDN connection sent by the UE, the HSGW, according to the saved GRE KEY information of the PDN connection, The uplink data is encapsulated into a GRE tunnel and sent to a corresponding PDN gateway.

18. A system for supporting optimized handover of a PDN connection in a multi-packet data network, comprising an evolved high-speed packet data eHRPD network and a long-term evolution system LTE network, characterized in that:

The evolved high speed packet data serving gateway HSGW in the eHRPD network uses the HSGW as described in claim 8 or 9 or 10;

The packet data network PDN gateway in the LTE network uses the PDN gateway as in claim 11 or 12.

A computer readable storage medium storing program instructions that, when executed, implement the method of any of claims 1-7 and 13-17.