WO2009056025A1

WO2009056025A1 - A data processing method and equipment

Info

Publication number: WO2009056025A1
Application number: PCT/CN2008/072555
Authority: WO
Inventors: Wenfu Wu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-11-02
Filing date: 2008-09-26
Publication date: 2009-05-07

Abstract

A data processing method is provided by embodiments of the invention, which is utilized in the data forward when a handover happens between heterogeneous networks and comprises following steps: when a user equipment performs a handover from an initiating network to a receiving network, the initiating network receives the data forwarding address achieved by the receiving network; a data forwarding tunnel is created between the gateway equipment of the initiating network and the gateway equipment of the receiving network according to the data forwarding address; the data is forwarded to the receiving network via the data forwarding tunnel. A data processing equipment is provided by embodiments of the invention. By utilizing the data lossless processing solution in handover between heterogeneous networks provided by embodiments of the invention, the problem of data loss in handover between heterogeneous networks in prior art is solved, the time of user service interrupt is reduced, the user experience is improved.

Description

Data processing method and device

The present invention relates to the field of network technologies, and in particular, to a data processing method and device. Background technique

3GPP (3rd Generation Partnership Project) In order to enhance the competitiveness of future networks, a new evolution network is being studied. The system architecture diagram is shown in Figure 1, including E-UTRAN (Evolved UMTS Terrestrial). Radio Access Network, an evolved UMTS terrestrial radio access network), used to implement all functions related to the evolution network wireless; MME (Mobility Management Entity), responsible for control plane mobility management, including user context and Mobile state management, assigning user temporary identity, etc.; Serving GW (Serving Gateway, Serving Gateway Entity), is the user plane anchor between 3GPP access networks, terminates the E-TURAN interface; PDN GW (Packet Data Network Gateway, packet) The data network gateway entity) is a user plane anchor between the 3GPP access network and the non-3GPP access network, terminating the interface with the external PDN. The PCRF (Policy and Charging Rule Function) is used for policy control decisions and flow accounting control functions. The HSS (Home Subscriber Server) is used to store user subscription information.

UTRAN (UMTS Terrestrial Radio Access Network, UMTS Terrestrial Radio Access Network), GERAN (GSM/EDGE Radio Access Network, GSM/EDGE Radio Access Network) for implementing all wireless related functions in existing GPRS/UMTS networks . The SGSN (Serving GPRS Supporting Node) is used to implement functions such as route forwarding, mobility management, session management, and user information storage in the GPRS/UMTS network.

Non-3GPP IP Access (non-3GPP IP Access), mainly access networks defined by non-3GPP organizations, such as WLAN (Wireless Local Area Network), Wimax ( Worldwide Interoperability for Microwave Access, Microwave access global interoperability), CDMA (Code Division Multiple Access) and other networks. The non-3GPP IP access network is connected to a PDN GW and an AAA (Authentication, Authorization and Accounting) server, wherein the AAA server is configured to perform access authentication, authorization, and accounting functions for the UE.

Figure 2 is a system architecture diagram of optimized handover of 3GPP and HRPD (High Rate Packet Data) networks (a CDMA network). An S 101 interface is added between the MME and the HRPD AN (HRPD Access Network) to deliver signaling between the MME and the HRPD AN. The PDSN (Packet Data Serving Node) is a user plane processing network element in the HRPD network, and performs user plane processing of the HRPD network.

In the prior art, a scenario in which a UE switches between heterogeneous networks occurs. For example, the HRPD accesses the network to optimize the handover of the UE to the E-UTRAN access network.

In the process of implementing the present invention, the inventor has found that in the currently used heterogeneous network handover procedure, for example, the HRPD to E-UTRAN network handover procedure, the disadvantage is that: the data lossless processing method in the handover is not considered in the flow, As a result, data loss during the handover process is relatively high, which causes the user to interrupt the service for a long time. It may also cause user service interruption and affect the user experience. Summary of the invention

Embodiments of the present invention provide a data processing method and apparatus for implementing lossless forwarding of data in a heterogeneous network switching procedure.

To achieve the above objective, an embodiment of the present invention provides a data processing method, including the following steps:

When the user equipment switches from the initiating network to the receiving network, the initiating network receives the data forwarding address obtained by the receiving network;

Creating a data forwarding tunnel between the gateway device of the originating network and the gateway device of the receiving network according to the data forwarding address; Data is forwarded to the receiving network through the data forwarding tunnel.

An embodiment of the present invention further provides a data processing method, including the following steps: when a user equipment switches from an initiating network to a receiving network, the gateway device of the receiving network notifies the receiving network and the user plane anchor network of the initiating network. The element performs bi-cast processing; the user plane anchor network element simultaneously sends data to the originating network and the receiving network according to the notification.

The embodiment of the present invention provides a data processing device on the receiving network side, including: a handover initiating entity, configured to notify a gateway device of the local network to create a data forwarding resource, and receive and receive a network side gateway device when the terminal switches to the local network. Sending a forwarding address and transmitting the forwarding address to the originating network;

The receiving network side gateway device is configured to receive the notification message of the handover initiation entity, create a data forwarding resource, and send the forwarding address to the handover initiation entity.

The embodiment of the present invention provides a data processing device for initiating a network side, including: a handover processing entity, configured to acquire a receiving network acquisition device when the terminal switches to the receiving network;

The initiating network side gateway device is configured to create and receive a data forwarding tunnel of the network side gateway device according to the data forwarding address, and send data to the receiving network side by using the data forwarding tunnel.

An embodiment of the present invention provides a data processing device on a receiving network side, including: a handover initiating entity, configured to notify a gateway device of the network to perform a dual-cast processing when detecting a terminal in the initiating network to switch to the local network;

The receiving network side gateway device is configured to receive the notification message, send the notification message to the receiving network and the user plane anchor network element of the initiating network, and receive the data sent by the user plane anchor network element.

Embodiments of the present invention have the following advantages over the prior art:

The embodiment of the present invention provides a data processing method for heterogeneous network switching, which solves the problem of data loss in heterogeneous network switching under the prior art by using a data forwarding method or a method for simultaneously transmitting data in a receiving network and an initiating network. Reduce user business interruptions Between, increase the user experience. DRAWINGS

Figure 1 is a network architecture diagram of an evolved network;

2 is a system architecture diagram of HRPD access network optimized handover in 3GPP and CDMA networks;

3 is a flowchart of a data processing method in Embodiment 1 of the present invention; FIG. 4 is a flowchart of another data processing method in Embodiment 1 of the present invention; FIG. 5A is a second embodiment of the present invention. Data forwarding method for HRPD to

E-UTRAN switching flowchart;

FIG. 5B is a HRPD process performed by the data forwarding method in Embodiment 2 of the present invention;

E-UTRAN handover signaling flow chart;

6A is a flowchart of switching E-UTRAN to HRPD by a data forwarding method according to Embodiment 2 of the present invention;

6B is a flowchart of handover signaling of E-UTRAN to HRPD by a data forwarding method according to Embodiment 2 of the present invention;

7A is a flowchart of switching HRPD E-UTRAN by a bi-cast method according to Embodiment 3 of the present invention;

7B is a flowchart of handover signaling of HRPD E-UTRAN by a bi-cast method according to Embodiment 3 of the present invention;

FIG. 8A is a flowchart of switching an E-UTRAN HRPD by a bi-cast method according to Embodiment 3 of the present invention; FIG.

FIG. 8B is a flowchart of handover signaling of E-UTRAN HRPD by a dual-cast method according to Embodiment 3 of the present invention; FIG.

9 is a schematic diagram of a data processing system in Embodiment 4 of the present invention; and FIG. 10 is a schematic diagram of a data processing system in Embodiment 5 of the present invention. detailed description Embodiments of the present invention will be further described below in conjunction with the drawings and embodiments. Embodiment 1 of the present invention provides a data processing method, which is applied to data forwarding when a handover occurs between heterogeneous networks, and may establish a data forwarding tunnel between the originating network and the receiving network of the terminal handover, or initiate the network and The receiving network simultaneously transmits data (dual broadcast processing) to implement data lossless forwarding during network switching. The heterogeneous network includes

Heterogeneous 3GPP and non-3GPP, also includes hybrid networking between non-3GPP, such as hybrid networking of CDMA and WIMAX networks.

When the method for establishing a data forwarding tunnel is used, a data processing method in the first embodiment of the present invention is as shown in FIG. 3, and includes the following steps:

Step s301: When the user equipment switches from the initiating network to the receiving network, the gateway device of the receiving network creates a data forwarding address.

Step s302: The receiving network sends the forwarding address to the originating network.

Step s303: Initiate the network to create a data forwarding tunnel between the gateway devices of the two networks according to the received forwarding address.

Step s304: Through the data forwarding tunnel, the initiating network forwards the data to the receiving network.

For data forwarding processing when a handover occurs between heterogeneous networks in a single APN multi-PDN connection, step s302 is processed as follows: The receiving network sends the forwarding address and the PDN connection information to the originating network.

The PDN connection information can be handled as follows:

(1) Packet Data Network Connection Identifier (PDN Connection ID). For each PDN connection of the UE, the PDN Connection ID identifies this PDN connection.

(2) APN and packet data network connection identifier (PDN Connection ID). For each PDN connection of the UE, the APN and PDN Connection ID identify this PDN connection.

(3) APN + serial number. For each PDN connection of the UE, the APN+ serial number identifies this PDN connection. For example, the first PDN connection of the UE, APN: 1 identifies this PDN connection; for the second PDN connection of the UE, APN: 2 identifies this PDN connection; and so on. Step s303 is processed as follows: According to the received forwarding address and PDN connection information, the initiating network creates a data forwarding tunnel between the gateway devices of the two networks.

When the method of bi-cast processing is used, a data processing method in the present invention is shown in FIG. 4, and includes the following steps:

Step s401: When the user equipment switches from the initiating network to the receiving network, the gateway device of the receiving network notifies the receiving network and the user plane anchor network element of the initiating network.

Step s402: The gateway device of the receiving network receives the data sent by the user plane anchor network element to the originating network and the receiving network at the same time.

The specific embodiments of the present invention are described below in conjunction with specific application scenarios, in which the terminal switches between the HRPD and the E-UTRAN network as an example.

In the second embodiment of the present invention, the data forwarding data forwarding method is taken as an example to describe the handover method of the HRPD to the E-UTRAN in the present invention, where the receiving network is E-UTRAN, and when the originating network is HRPD, the first network on the receiving network side is received. The element is the MME, and the second network element on the receiving network side is the S-GW, and the first network element on the initiating network side is the HRPD AN, and the second network element in the initiating network side is the PDSN. As shown in Figure 5A: The following steps are included:

Step s5A01: After the MME finds that the UE switches from the HRPD to the EUTRAN network, it notifies the Serving GW to create a data forwarding resource between the HRPD and the E-UTRAN network (including a data forwarding tunnel between the Serving GW and the PDSN and between the Serving GW and the eNodeB). Data forwarding tunnel).

Step s5A02, the Serving GW establishes a tunnel, and notifies the corresponding tunnel information to step s5A03, and the MME notifies the HRPD AN of the Serving GW Address information. Step s5A04, HRPD AN notifies the PDSN of the Serving GW Address information. Step s5A05, PDSN creates PDSN according to Serving GW Address and

The data forwarding resource (P-P interface tunnel) between the Serving GWs, and forwards the downlink data to the Serving GW on this interface tunnel.

For the data forwarding process when a handover occurs between the heterogeneous networks in the case of a single APN multi-PDN connection, the processing of the step s5A03 is as follows: The MME notifies the HRPD AN of the Serving GW Address and the PDN connection information. The step s5A04 is processed as follows: The HRPD AN notifies the PDSN of the Serving GW Address and the PDN connection information.

Step s5A05 is processed as follows: The PDSN creates a data forwarding resource (P-P interface tunnel) between the PDSN and the Serving GW according to the Serving GW Address and the PDN connection information. That is, for each PDN connection, the PDSN creates a GRE tunnel between the PDSN and the Serving GW. The PDSN forwards the downlink data on this PDN connection to the Serving GW on this GRE tunnel.

The specific handover signaling process corresponding to the foregoing process in the networking scenario is as shown in FIG. 5B, and includes the following steps:

Step s501: The UE accesses the HRPD network.

Step s502, UE or HRPD AN (Access Network, access network) decides to perform handover to the E-UTRAN network.

Step s503: The UE sends an Attach Request message to the MME through the HRPD network. Step s504, the authentication procedure is executed.

Step s505: The MME sends an Update Location message to the HSS to obtain the subscription data of the UE. The HSS returns the subscription data of the UE, including the PDN GW address information used by the UE.

Step s506: The MME selects the Serving GW and sends a Create Default Bearer Request message to the Serving GW. Serving GW returns the Create Default Bearer Response message to the MME.

Step s507: The MME finds that the UE switches from the HRPD to the E-UTRAN network, and the MME selects the Serving GW currently used by the UE or selects a Serving GW (the Serving GW has a data forwarding function between the E-UTRAN and the HRPD). The MME then notifies the selected Serving GW to create a data forwarding resource between the HRPD and the E-UTRAN network, which can be handled as follows:

1. The MME sends a Create Bearer Request message to the Serving GW. The MME adds an indicator bit cell to this message to instruct the Serving GW to perform data forwarding resource creation between the HRPD and the E-UTRAN network. Possible ways to indicate a bit cell are:

HRPD to E-UTRAN handover indicator bit cell (HRPD to E-UTRAN) Handover Indication ).

Handover Type: The MME sets this switch type cell to "HRPD to E-UTRAN Handover".

Data Forwarding Type: The MME sets this cell to "HRPD to E-UTRAN Data Forwarding".

Cause Cell: MME sets Cause to "HRPD to E-UTRAN Handover".

2. The MME sends a specific message, such as Create Data Forwarding Tunnel Request, to instruct the Serving GW to create a data forwarding resource between the HRPD and the E-UTRAN network.

After receiving the above message, the Serving GW creates a data forwarding resource (P-P interface tunnel) between the Serving GW and the PDSN, and a data forwarding resource (GTP-U tunnel) from the Serving GW to the eNodeB. The Serving GW then returns a Create Bearer Response (Serving GW Address) message to the MME. The Serving GW Address is the forwarding address of the Serving GW, and the subsequent PDSN forwards the downlink packet to the Serving GW corresponding to this address.

The Serving GW can start a timer. After this timer expires, the Serving GW will release the established data forwarding resources.

Step s508: The MME sends an SI 01 HO Command message to the HRPD AN, where the message includes an Attach Accept message and a HO Command message, and a Serving GW Address.

Step s509: The HRPD AN finds that the UE switches from the HRPD network to the E-UTRAN network, and the HRPD AN notifies the PDSN to create a data forwarding resource between the HRPD and the E-UTRAN network, and may have the following processing methods:

1. The HRPD AN sends an Al 1 -Registration Request message to the PDSN. HRPD

The AN adds an indicator bit cell to this message to instruct the PDSN to perform data forwarding resource creation between the HRPD and the E-UTRAN network. Possible ways to indicate a bit cell are:

HRPD to E-UTRAN Handover Indication (HRPD to E-UTRAN Handover Indication). Handover Type: The HRPD AN sets this switch type cell to "HRPD to E-UTRAN Handover".

Data Forwarding Type: The HRPD AN sets this cell to "HRPD to E-UTRAN Data Forwarding".

Cause cell: HRPD AN sets Cause to "HRPD to E-UTRAN"

Handover".

The HRPD AN sets the "S" flag in the Flag cell to "True" or "Γ indicates that the PDSN is caused by the PDSN fast Handoff.

2. The HRPD AN sends a specific message, such as Al 1-Create Data Forwarding Tunnel Request, to instruct the PDSN to create a data forwarding resource between the HRPD and the E-UTRAN network.

The HRPD AN carries the Serving GW Address received by the HRPD AN from the MME in the above message. The PDSN (PDSN (Serving GW Address)) is created after the PDSN receives the above message. Returning the Al 1 -Registration Reply message to the HRPD AN „ PDSN can start a timer. After this timer expires, the PDSN will release the established PP Connection resource.

After receiving the downlink data sent by the PDN GW, the PDSN forwards the downlink data packet to the Serving GW through the P-P Connection that has been created. For the PDSN, the protocol used by the PP interface is GRE (Generic Routing Encapsulation). For the Serving GW, the interface protocol between the eNodeB and the eNodeB is GTP (GPRS Tunneling Protocol). . Therefore, the forwarding packet received by the Serving GW from the PDSN is in the GRE format, and the Serving GW needs to convert the received forwarding packet format from the GRE format to the GTP format. If the resources in the eNodeB have not been established, the Serving GW caches the converted forwarding packets. If the resource in the eNodeB has been established, the Serving GW sends the converted forwarding packet to the eNodeB.

Step s510: The HRPD AN sends an HRPD AN L2 message to the UE, where the message includes an Attach Accept message and an HO Command message. Step s511: The UE switches to the E-UTRAN network, and sends a Service Request message to the MME.

Step s512, authentication may be performed.

Step s513: The MME sends a Sl-AP: Initial Context Setup Request message to the eNodeB.

Step s514: The eNodeB initiates an RB (Radio Bearer) setup process.

Step s515: The eNodeB returns to the Sl-AP: Initial Context Setup Complete message to the MME.

Step s516: The MME sends an Update Bearer Request message to the Serving GW. Step s517: If the interface protocol between the Serving GW and the PDN GW uses the GTP protocol, the Serving GW sends an Update Bearer Request message to the PDN GW, and the PDN GW returns the Update Bearer Response message to the Serving GW. If the interface protocol between the Serving GW and the PDN GW uses the PMIP protocol, the Serving GW sends a Proxy BU message to the PDN GW, and the PDN GW returns the Proxy BA message to the Serving GW.

Step s518, Serving GW returns the Update Bearer Response message to the MME. Step s519: The MME sends HO Complete to the HRPD AN to notify the HRPD AN that the handover is completed.

Step s520: The PDN GW initiates a release processing process between the source HRPD networks. Step s521, the MME may initiate a Delete Bearer after receiving the HO Complete message.

The Request process notifies the Serving GW to delete the created forwarding tunnel resource.

For the data forwarding process when the handover occurs between the heterogeneous networks in the case of a single APN multi-PDN connection, the step s508 is processed as follows: The MME sends a S101 HO Command message to the HRPD AN, where the message includes an Attach Accept message and a HO Command message.

Serving GW Address and PDN connection information.

Step s509 is processed as follows: HRPD AN discovers that the UE is from the HRPD network

E-UTRAN network handover (ie, the HRPD AN receives the HO Command message sent by the MME), then the HRPD AN informs the PDSN to create an HRPD and an E-UTRAN network. Data forwarding resources. The HRPD AN carries the Serving GW Address and PDN connection information received by the HRPD AN from the MME in the message. After receiving the above message, the PDSN creates a data forwarding resource between the PDSN and the Serving GW. That is, for each PDN connection, the PDSN creates a GRE tunnel between the PDSN and the Serving GW.

In the second embodiment of the present invention, the data forwarding Data Forwarding method is taken as an example to describe the E-UTRAN to HRPD handover method in the present invention. When the receiving network is HRPD and the originating network is E-UTRAN, the first network on the receiving network side is received. The element is the HRPD AN, and the second network element on the receiving network side is the PDSN, and the first network element on the initiating network side is the MME, and the second network element in the initiating network side is the S-GW. As shown in Figure 6A: The following steps are included:

Step s6A01, HRPD AN finds that the UE sends a message to the PDSN after switching from the E-UTRAN to the HRPD network.

Step s6A02, HRPD AN receives the forwarding address sent by the PDSN (also referred to as P-P Anchor Address, Anchor P-P Address).

Step s6A03, the HRPD AN notifies the MME of the forwarding address information of the PDSN. Step s6A04, the MME sends a message to inform the Serving GW to create the HRPD and

Data forwarding resources between E-UTRAN networks (data forwarding tunnel between Serving GW and PDSN and data forwarding tunnel between Serving GW and eNodeB).

Step s6A05, the Serving GW notifies the MME of the corresponding tunnel information.

Step s6A06: The MME notifies the eNodeB of the data forwarding tunnel information of the Serving GW.

Step s6A07, the eNodeB forwards the buffered data packet to the Serving GW.

Step s6A08, Serving GW forwards the data packet to the PDSN.

Remarks: For the data forwarding process when a switchover occurs between heterogeneous networks in a single APN multi-PDN connection (Connection), the step s6A03 is as follows: The HRPD AN notifies the MME of the PDSN forwarding address and PDN connection information.

The specific handover signaling process corresponding to the foregoing process in the networking scenario is as shown in FIG. 6B, and includes the following steps:

Step s601: The UE accesses in the E-UTRAN network.

Step s602: The UE or the eNodeB decides to pre-register with the HRPD network. Step s603: The UE performs a process of establishing an IP service connection between the specific program in the HRPD access network and the PDSN, and the authentication in the HRPD access network.

Step s604, the UE or the eNodeB decides to perform handover to the HRPD.

Step s605: The eNodeB sends a Relocation Indication message, and the UE notifies the UE to perform handover.

Step s606: The UE sends an HRPD Connection Request message to the HRPD AN. The HRPD AN allocates radio resources, and triggers the PDSN session state from the quiescent state to the active state.

Step s607: The HRPD AN finds that the UE switches from the E-UTRAN network to the HRPD network, and the HRPD AN notifies the PDSN to create a data forwarding resource between the HRPD and the E-UTRAN network, and may have the following processing methods:

1. The HRPD AN sends an All-Registration Request message to the PDSN. The HRPD AN adds an indicator bit cell to this message to instruct the PDSN to perform data forwarding resource creation between the HRPD and the E-UTRAN network. Possible methods for indicating bit cells are: E-UTRAN to HRPD handover indicator bit cell (E-UTRAN to HRPD)

Handover Indication ).

Handover Type: The HRPD AN sets this switch type cell to "E-UTRAN to HRPD Handover".

Data Forwarding Type: The HRPD AN sets this cell to "E-UTRAN to HRPD Data Forwarding".

Cause cell: HRPD AN sets Cause to "E-UTRAN to HRPD Handover".

2. The HRPD AN sends a specific message such as Al 1-Create Data Forwarding

The Tunnel Request indicates that the PDSN creates a data forwarding resource between the HRPD and the E-UTRAN network.

After receiving the above message, the PDSN will send an All-Registration Reply or All-Create Data Forwarding Tunnel Response message to the HRPD AN. PDSN is returning The message carries the forwarding address of the PDSN, also known as the PP PP Address.

Step s608: The HRPD AN sends an S101 HO Command message (HRPD TCA) to the MME. The message carries the forwarding address of the PDSN.

Step s609: The MME finds that the UE switches the HRPD from the E-UTRAN, and the MME selects the Serving GW currently used by the UE or selects a Serving GW (this Serving GW has a data forwarding function between the E-UTRAN and the HRPD). The MME then notifies the selected Serving GW to create a data forwarding resource between the HRPD and the E-UTRAN network, which can be handled as follows:

1. The MME sends a Create Bearer Request message to the Serving GW. The MME adds an indicator bit cell to this message to instruct the Serving GW to perform data forwarding resource creation between the HRPD and the E-UTRAN network. Possible methods for indicating a bit cell are: E-UTRAN to HRPD Handover Indication (E-UTRAN to HRPD Handover Indication).

Handover Type: The MME sets this switch type cell to "E-UTRAN to HRPD Handover".

Data Forwarding Type: The MME sets this cell to "E-UTRAN to HRPD Data Forwarding".

Cause Cell: MME sets Cause to "E-UTRAN to HRPD Handover".

The MME notifies the Serving GW of the forwarding address of the PDSN in the above message. The Serving GW forwards the received forwarding packet to the PDSN corresponding to this address.

After receiving the above message, the Serving GW creates a data forwarding resource between the HRPD and the E-UTRAN network (a data forwarding resource between the Serving GW and the PDSN, and a data forwarding resource from the Serving GW to the eNodeB). Then Serving GW returns Create Bearer Response or Create Data Forwarding Tunnel Response message ( Serving GW Address, Serving GW TEID) to MME. The Serving GW Address and the Serving GW TEID are data forwarding tunnel information allocated by the Serving GW, and the subsequent eNodeB forwards the buffered downlink data packet to the allocated data forwarding tunnel.

The Serving GW can start a timer. After the timer expires, the Serving GW will release the established data forwarding tunnel resources.

Step s610: The MME sends an S1-AP message Relocation Command (HRPD TCA, Serving GW Address, Serving GW TEID) to the eNodeB.

Step s611: After receiving the specific message, the eNodeB sends a HO Command message to the UE, and notifies the UE to perform the handover. The message carries the HRPD TCA message.

The eNodeB forwards the buffered downstream data packet to the Serving GW. After receiving the downlink data packet forwarded by the eNodeB, the Serving GW forwards the downlink data packet to the PDSN through the P-P Connection that has been created. For the Serving GW, the protocol used by its P-P interface is GRE, and the interface protocol between it and the eNodeB is GTP. Therefore, the forwarding packet received by the Serving GW from the eNodeB is in the GTP format, and the Serving GW needs to convert the received forwarding packet format from the GTP format to the GRE format.

Step s612: The UE switches to the HRPD access network, and executes a traffic channel acquisition procedure.

Step s613: The UE sends an HRPD Traffic Channel Complete (TCC) message to the HRPD AN„

Step s614: The HRPD AN notifies the PDSN UE to switch to the target network, and the PDSN needs to notify the PDN GW to modify the reason of the downlink data. There may be the following treatment methods:

1. The HRPD AN sends an All-Registration Request message to the PDSN. The HRPD AN adds an indicator bit cell to this message to indicate that the PDSN UE has switched to the target network, and the PDSN needs to inform the PDN GW to modify the downstream data path. The possible ways to indicate a bit cell are:

Handover Complete Indication.

Handover Type: The HRPD AN sets this switch type cell to "Handover Complete".

Cause cell: HRPD AN sets Cause to "Handover Complete". The HRPD AN sets the "S" flag bit in the Flag cell in the Al 1 -Registration Request message to "False" or "0".

2. The HRPD AN sends a specific message such as Al 1 -Handover Complete indicating that the PDSN UE has switched to the target network, and the PDSN needs to inform the PDN GW to modify the downlink data path.

Step s615: After receiving the above message, the PDSN sends a Proxy BU message to the PDN.

GW.

Step s616, the PDSN returns an All-Registration Reply or All-Handover Complete Acknowledge message to the HRPD AN.

Step s617, the source E-UTRAN/EPS releases the resource.

Step s618: The MME may initiate a Delete Bearer Request process, and notify the Serving GW to delete the created forwarding tunnel resource.

For the data forwarding process when a handover occurs between the heterogeneous networks in a single APN multi-PDN connection (Connection), the step s608 is processed as follows: The HRPD AN sends a S101 HO Command message (HRPD TCA) to the MME, where the message carries the forwarding address of the PDSN and PDN connection information.

Step s609 is processed as follows: The MME finds that the UE switches HRPD from the E-UTRAN, and the MME selects the Serving GW currently used by the UE or selects a Serving GW (this Serving GW has a data forwarding function between the E-UTRAN and the HRPD). The MME then notifies the selected Serving GW to create a data forwarding resource between the HRPD and the E-UTRAN network. The MME notifies the Serving GW of the forwarding address of the PDSN and the PDN connection information in the message. The subsequent Serving GW forwards the received forwarding packet to the PDSN corresponding to this address.

After receiving the above message, the Serving GW creates a data forwarding resource between the HRPD and the E-UTRAN network (a data forwarding resource between the Serving GW and the PDSN, and a data forwarding resource from the Serving GW to the eNodeB). For each PDN connection, the Serving GW creates a GRE tunnel between the Serving GW and the PDSN. The subsequent Serving GW forwards the forwarded packets on this PDN connection to the PDSN through this GRE tunnel.

In the third embodiment of the present invention, the bidirectional bi-casting method is taken as an example to illustrate the present invention. The method for switching from HRPD to E-UTRAN, wherein the receiving network is E-UTRAN, the originating network is HRPD, the receiving network side first network element is MME, and the receiving network side second network element is S-GW, user plane anchor network The yuan is PDN GW. As shown in Figure 7A: The following steps are included:

Step s7A01: The MME finds that the UE sends a message to the PDN GW to perform double binding after switching from the HRPD to the E-UTRAN network.

Step s7A02, PDN GW is dual-bound with Serving GW and PDSN.

Step s7A03, PDN GW receives downlink data and then relays downlink data to Serving

GW and PDSN.

Step s7A04: After the UE switches to the E-UTRAN network, the MME notifies the PDN GW to cancel the double binding.

Step s7A05 and PDN GW only send the downlink data to the Serving GW. The specific handover signaling process corresponding to the foregoing process in the networking scenario is as shown in FIG. 7B, and includes the following steps:

Step s701: The UE accesses the HRPD network.

Step s702, the UE or the HRPD AN (Access Network, access network) decides to perform handover to the E-UTRAN network.

Step s703: The UE sends an Attach Request message to the MME through the HRPD network. Step s704, the authentication procedure is executed.

Step s705: The MME sends an Update Location message to the HSS to obtain the subscription data of the UE. The HSS returns the subscription data of the UE, including the PDN GW address information used by the UE.

Step s706: The MME selects the Serving GW, and sends a Create Default Bearer Request message to the Serving GW. The MME adds an indicator bit cell to the Create Default Bearer Request message to notify the Serving GW whether the request message is caused by the cause or notify the subsequent network element. deal with. Possible ways to indicate a bit cell are:

HRPD to E-UTRAN handover indicator cell (HRPD to E-UTRAN Handover Indication) or non-3GPP to non-3 GPP Handover Indication (3GPP to non-3 GPP Handover Indication). Handover Type: The MME sets this handover type cell to "HRPD to E-UTRAN Handover" or "non-3GPP to 3GPP Handover".

Cause Cell: The MME sets Cause to "HRPD to E-UTRAN Handover" or "non-3 GPP to 3 GPP Handover".

Bi-casting Indication: The MME indicates that the subsequent NE needs to perform dual-cast processing.

Step s707: If the interface between the Serving GW and the PDN GW uses the GTP protocol, the Serving GW sends a Create Default Bearer Request message to the PDN GW. The Serving GW intensifies the port indicator in the Create Default Bearer Request message to inform the PDN GW whether the request message is caused or what the PDN GW is notified. Possible ways to indicate a bit cell are:

HRPD to E-UTRAN handover indicator cell (HRPD to E-UTRAN Handover Indication) or non-3 GPP to 3GPP handover indicator (non-3 GPP to 3GPP Handover Indication).

Handover Type: The Serving GW sets this switch type cell to "HRPD to E-UTRAN Handover" or "non-3GPP to 3GPP Handover".

Cause cell: Serving GW sets Cause to "HRPD to E-UTRAN Handover" or "non-3 GPP to 3 GPP Handover".

Bi-casting Indication: The Serving GW indicates through this cell that the PDN GW needs to perform dual-cast processing.

If the interface between the Serving GW and the PDN GW uses the PMIP protocol, the Serving GW sends a Proxy BU message to the PDN GW. The Serving GW adds an indication bit cell to the Proxy BU message to inform the PDN GW whether the binding update message is due to any reason or to inform the PDN GW how to handle it. Possible ways to indicate a bit cell are:

HRPD to E-UTRAN Handover Indication or non-3 GPP to 3GPP handover indicator bit cell (non-3 GPP to 3 GPP Handover Indication).

Cause cell: Serving GW sets Cause to "HRPD to E-UTRAN"

Handover" or "non-3 GPP to 3 GPP Handover".

The Serving GW sets the "S" flag in the Proxy BU message to indicate that the PDN GW is dual-bound.

After receiving the message sent by the Serving GW, the PDN GW adds a binding update or adds a bearer context, and the resources in the source HRPD continue to be reserved. After receiving the downlink data, the PDN GW double-casts the downlink data on the source HRPD side and the target E-UTRAN side. The PDN GW can start a timer. After the timer expires, the PDN GW cancels the bi-directional mechanism and releases the source-side resources.

Step s708: The Serving GW returns a Create Default Bearer Response message to step s709. The MME sends a SI 01 HO Command message to the HRPD AN, where the message includes an Attach Accept message and a HO Command message.

Step s7010: The HRPD AN sends an HRPD AN L2 message to the UE, where the message includes an Attach Accept message and a HO Command message.

Step s711: The UE switches to the E-UTRAN network, and sends a Service Request message to the MME.

Step s712, authentication may be performed.

Step s713: The MME sends a Sl-AP: Initial Context Setup Request message to the eNodeB

Step s714: The eNodeB initiates an RB (Radio Bearer) setup process.

Step s715, eNodeB returns to Sl-AP: Initial Context Setup Complete Interest to the MME.

Step s716: The MME sends an Update Bearer Request message to the Serving GW. The MME may add an indication bit cell to this message to indicate what the Serving GW message is causing or to indicate how the Serving GW handles it. Possible methods for indicating bit cells are:

Handover Complete Indication.

Handover Type: The MME sets this switch type cell to "Handover Complete".

Modify Type: The MME sets this modified type cell to "User Plane Path Switch" or "Cancel Bi-casting".

Cause cell: The MME sets Cause to "Handover Complete" or "User Plane Path Switch" or "Cancel Bi-casting".

Cancel Bi-casting Indication: The MME indicates that the subsequent NE cancels the dual-cast processing.

The MME indicates, by the above indication bit, that the Modify GW request to modify the bearer is caused by the UE switching to the target network or requires user plane path switching. This flag is optional.

Step s717: If the interface protocol between the Serving GW and the PDN GW uses the GTP protocol, the Serving GW sends an Update Bearer Request message to the PDN GW. The Serving GW may add an indicator bit cell to this message to indicate to the PDN GW whether the message was caused or what the PDN GW is handling. Possible ways to indicate a bit cell are:

Handover Complete Indication.

Handover Type: Serving GW sets this switch type cell to "Handover Complete"

Modify Type: The Serving GW sets this modified type cell to "User Plane Path Switch" or "Cancel Bi-casting"

Cause cell. Serving GW sets Cause to "Handover Complete" or "User Plane Path Switch" or "Cancel Bi-casting". Cancel Bi-casting Indication: The Serving GW instructs the PDN GW to cancel the dual-cast processing by this cell.

The Serving GW indicates to the PDN GW that the modified bearer request is caused by the UE switching to the target network or requires user plane path switching. This mark is optional.

If the interface protocol between the Serving GW and the PDN GW uses the PMIP protocol, the Serving GW sends a Proxy BU message to the PDN GW. The Serving GW may add an indicator bit cell to this message to indicate what the PDN GW message was due to or what the PDN GW is handling. Possible methods for indicating a bit cell are: Handover Complete Indication »

Handover Type: The Serving GW sets this switch type cell to "Handover Complete".

Cause cell. Serving GW sets Cause to "Handover Complete" or "User Plane Path Switch" or "Cancel Bi-casting".

Cancel Bi-casting Indication: The Serving GW instructs the PDN GW to cancel the dual-cast processing.

The Serving GW clears the "S" flag in the Proxy BU message to instruct the PDN GW to cancel the binding on the source side.

The Serving GW indicates through the above indication bit that the PDN GW this binding update is caused by the UE switching to the target network or requires user plane path switching. This flag is optional.

After receiving the above message, the PDN GW cancels the data double play mechanism and modifies the downlink data route to the Serving GW. After receiving the downlink data, the PDN GW will only send it to the Serving GW.

Step s718: Serving GW returns the Update Bearer Response message to the MME. Step s719: The MME sends HO Complete to the HRPD AN to notify the HRPD AN that the handover is completed.

Step s720: The PDN GW initiates a release processing procedure between the source HRPD networks. In the third embodiment of the present invention, the method for switching E-UTRAN to HRPD in the present invention is described by using a bi-cast bi-casting method, where the receiving network is HRPD, the originating network is E-UTRAN, and the first network on the receiving network side is received. The element is the HRPD AN, the second network element on the receiving network side is the PDSN, and the user plane anchor network element is the PDN GW. As shown in Figure 8A: The following steps are included:

Step s8A01, HRPD AN finds that the UE sends a message from the E-UTRAN to the HRPD network to notify the PDN GW to double bind.

Step s8A02, PDN GW is dual-bound with Serving GW and PDSN.

Step s8A03, PDN GW receives downlink data and then relays downlink data to Serving

GW and PDSN.

Step s8A04: After the UE switches to the HRPD network, the HRPD AN notifies the PDN GW to cancel the double binding.

Step s8A05, PDN GW receives the downlink data and sends it only to the Serving GW. The specific handover signaling process corresponding to the foregoing process in the networking scenario is as shown in FIG. 8B, and includes the following steps:

Step s801: The UE accesses in the E-UTRAN network.

Step s802, the UE or the eNodeB decides to pre-register with the HRPD network.

Step s803: The UE performs a process of establishing an IP service connection between the specific program in the HRPD access network and the PDSN, and the authentication in the HRPD access network.

Step s804, the UE or the eNodeB decides to perform handover to the HRPD.

Step s805: The eNodeB sends a Relocation Indication message, and the UE notifies the UE to perform handover.

Step s806: The UE sends an HRPD Connection Request message to the HRPD AN. The HRPD AN allocates radio resources and triggers the PDSN session state from a quiescent state to an active state.

Step s807, the HRPD AN sends an Al 1 -Registration Request message to the PDSN. The HRPD AN adds an indicator bit cell in the message to inform the PDSN whether the registration request is caused by or for indicating the PDSN. Possible methods are:

E-UTRAN to HRPD to HRPD Handover Indication or 3GPP to non-3 GPP Handover Indication.

Handover Type: The HRPD AN sets this switch type cell to "E-UTRAN to HRPD Handover" or "3GPP to non-3GPP Handover".

Cause cell: HRPD AN sets Cause to "E-UTRAN to HRPD

Handover" or "3GPP to non-3 GPP Handover".

Bi-casting Indication: The HRPD AN indicates through this cell that subsequent NEs need to perform dual-cast processing.

HRPD AN sets the "S" flag in the Flag cell in the Al 1 -Registration Request message to "True" or "Γ, indicating that the PDSN registration request is due to

PDSN fast handoff caused.

Step s808: After receiving the Al 1 -Registration Request message, the PDSN sends a Proxy BU message to the PDN GW if the message is found to be due to handover or requires subsequent network element bi-cast processing. The PDSN adds an indication bit cell in this message to inform the PDN GW whether the binding update message is caused by or for notification.

How is the PDN GW handled? Possible ways to indicate a bit cell are:

E-UTRAN to HRPD handover indicator bit cell (E-UTRAN to HRPD

Handover Indication ) or 3GPP to non-3GPP Handover Indication (3GPP to non-3 GPP Handover Indication).

Handover Type: The PDSN sets this handover type cell to "E-UTRAN to HRPD Handover" or "3GPP to non-3GPP Handover".

Cause Cell: The PDSN sets Cause to "E-UTRAN to HRPD Handover" or "3GPP to non-3 GPP Handover".

Bi-casting Indication: The PDSN indicates through this cell that subsequent NEs need to perform dual-cast processing. The PDSN sets the "S" flag in the Proxy BU message to indicate that the PDN GW is dual-bound.

After receiving the above message, the PDN GW adds a binding update, and the resources in the source E-UTRAN continue to be reserved. After receiving the downlink data, the PDN GW double-casts the downlink data on the source E-UTRAN side and the target HRPD side. The PDN GW can start a timer. After the timer expires, the PDN GW cancels the dual-cast mechanism and releases the source-side resources.

Step s809: The PDSN returns an Al 1 -Registration Reply message to the HRPD AN. Step s810: The HRPD AN sends a S101 HO Command message (HRPD TCA) to the MME.

Step s811, the MME sends a Sl-AP message Relocation Command (HRPD)

TCA) to the eNodeB.

Step s812: After receiving the specific message, the eNodeB sends a HO Command message to the UE, and notifies the UE to perform the handover. The message carries the HRPD TCA message.

Step s813: The UE switches to the HRPD access network, and executes a traffic channel acquisition procedure.

Step s814: The UE sends an HRPD Traffic Channel Complete (TCC) message to the HRPD AN„

Step s815: The HRPD AN sends an Al 1 -Registration Request message to the PDSN. The HRPD AN adds an indication bit in the message to notify the PDSN that the registration request is caused by the UE switching to the target network, and the PDSN needs to notify the PDN GW to modify the downlink data reason. Possible ways to indicate a bit cell are:

Handover Complete Indication.

Handover Type: The HRPD AN sets this switch type cell to "Handover Complete".

Modify Type: HRPD AN sets this modified type cell to "User Plane Path Switch" or "Cancel Bi-casting".

Cause cell: HRPD AN sets Cause to "Handover Complete" or "User Plane Path Switch" or "Cancel Bi-casting".

Cancel Bi-casting Indication: HRPD AN This cell indicates that the subsequent network element cancels the dual broadcast processing.

The HRPD AN sets the "S" flag in the Flag cell in the Al 1 -Registration Request message to "False" or "0".

The HRPD AN indicates by the above indication bit that the PDSN UE has switched to the target network or requires user plane path switching. This flag is optional.

Step s816: After receiving the All-Registration Request message, the PDSN finds that the message is caused by the UE switching to the HRPD or requires the user plane path switch, the PDSN sends a Proxy BU message to the PDN GW. The PDSN adds an indication bit in this message to inform the PDN GW of the binding update message for what reason or to inform the PDN GW how to handle it. Possible ways to indicate a bit cell are:

Handover Complete Indication.

Handover Type: The PDSN sets this switch type cell to "Handover Complete".

Modify Type: The PDSN sets this modified type cell to "User Plane Path Switch" or "Cancel Bi-casting".

Cause cell: The PDSN sets Cause to "Handover Complete" or "User Plane Path Switch" or "Cancel Bi-casting".

Cancel Bi-casting Indication: The PDSN indicates that the subsequent NE cancels the dual-cast processing.

The PDSN clears the "S" flag in the Proxy BU message to instruct the PDN GW to cancel the double binding, that is, to cancel the binding on the source side.

The PDSN indicates through the above indication bit that the PDN GW UE has switched to the target network or requires user plane path switching or cancels the bi-cast processing. This flag is optional.

After receiving the above message, the PDN GW cancels the data bi-cast mechanism and modifies the downlink data route to the PDSN. After receiving the downlink data, the PDN GW will only send it to the PDSN.

Step s817, the PDSN returns an All-Registration Reply message to the HRPD AN. Step s818, the source E-UTRAN/EPS releases the resource.

Through the above embodiments of the present invention, a data lossless processing method for heterogeneous network switching is proposed, which solves the prior art difference by using a data forwarding method or a dual-cast processing method. The problem of data loss during network switching is reduced, the time for user service interruption is reduced, and the user experience is increased.

In the fourth embodiment of the present invention, a data processing system is further provided, which is applied to data forwarding when a handover occurs between heterogeneous networks. As shown in FIG. 9, the method includes: receiving a data processing device 10 and a receiving network on the network side. Side gateway device 20. The data processing device 10 on the receiving network side is configured to establish a data forwarding address and receive data sent by the network side gateway device 20.

Receiving the data processing device 10 on the network side, further comprising:

The handover initiating entity 11 is configured to notify the gateway device of the local network to create a data forwarding address, and send the forwarding address to the originating network when the terminal in the initiating network switches to the local network; when the network is an HRPD network The handover initiation entity is located in the HRPD AN. When the local network is E-UTRAN, the handover initiation entity is located in the MME.

The receiving network side gateway device 12 is configured to: when receiving the notification message of the handover initiating entity 11, create a data forwarding address and notify the handover initiating entity 11; and receive data sent by the initiating network.

Initiating the data processing device 20 on the network side, further comprising:

The switching processing entity 21 is configured to obtain a data forwarding address established by the receiving network when the terminal in the network switches to the receiving network, and send the forwarding address to the initiating network side gateway device 22. When the network is an HRPD network, the handover initiation entity 11 is located in the HRPD AN; when the network is E-UTRAN, the handover initiation entity 11 is located in the MME.

The initiating network side gateway device 22 is configured to create and receive a data forwarding tunnel of the network side network management device 20 according to the data forwarding address sent by the handover processing entity 21, and send data to the receiving network side through the data forwarding tunnel.

In the fifth embodiment of the present invention, a data processing system is also provided, which is used for data forwarding during heterogeneous network switching, as shown in FIG. 10, including:

The data processing device 40 on the receiving network side is configured to notify the user that the anchor network element 50 performs the bi-cast processing when the terminal switches from the originating network to the local network, and receives the data sent by the user plane anchor network element 50. The user plane anchor network element 50 is configured to perform data bi-cast processing in the receiving network and the initiating network according to the notification of the receiving network, and simultaneously send data to the receiving network and the initiating network.

The data processing device 40 on the receiving network side further includes:

The handover initiating entity 41 is configured to notify the gateway device 42 of the local network when detecting that the terminal in the initiating network switches to the local network. When the network is an HRPD network, the handover originating entity is located in the HRPD AN; when the network is E-UTRAN, the handover originating entity is located in the MME.

The receiving network side gateway device 42 is configured to notify the receiving network and the user plane anchor network element 50 of the initiating network when receiving the notification message of the handover initiating entity 41; and receive the user plane anchor network element 50 to simultaneously initiate the network and receive Data sent by the network.

Through the system and device in the above embodiments of the present invention, a data lossless processing method for heterogeneous network switching is proposed, which solves data loss during heterogeneous network switching in the prior art by using a data forwarding method or a dual-cast processing method. The problem is to reduce the time of user business interruption and increase the user's body.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A data processing method, comprising the steps of:

Creating a data forwarding tunnel between the gateway device of the originating network and the gateway device receiving the network according to the data forwarding address;

Data is forwarded to the receiving network through the data forwarding tunnel.

2. The data processing method according to claim 1, wherein when the receiving network is a high speed packet data network HRPD network, and the originating network is an evolved UMTS terrestrial radio access network E-UTRAN, the method further Includes:

The access network HRPD AN of the HRPD network acquires a data forwarding address from a gateway device data service node PDSN of the HRPD network;

The data forwarding address obtained by the initiating network and received by the receiving network is specifically: an active management entity MME.

The data processing method according to claim 2, wherein the data forwarding tunnel between the gateway device that creates the originating network and the gateway device that receives the network according to the forwarding address is specifically: the standby service gateway S- GW, notifying the S-GW to establish a data forwarding tunnel;

The S-GW establishes a data forwarding tunnel with the PDSN according to the data forwarding address, and a data forwarding tunnel with the eNodeB in the E-UTRAN; or the creating the originating network according to the forwarding address. The data forwarding tunnel between the gateway device and the gateway device of the receiving network is specifically:

Receiving, by the MME, packet data network identifier information sent by the HRPD AN

PDN identification information;

Sending, by the MME, the PDN identification information and the data forwarding address information to the S-GW; The S-GW creates a data forwarding tunnel with the PDSN and a data forwarding tunnel with the base station eNodeB in the E-UTRAN according to the PDN identification information and the data forwarding address.

4. The data processing method according to claim 3, wherein:

The forwarding of the data to the receiving network is specifically:

The S-GW receives the data packet sent by the eNodeB through the data forwarding tunnel, and sends the data packet to the PDSN through the data forwarding tunnel between the SDS and the PDSN.

The data processing method according to any one of claims 2 to 4, wherein the sending address is specifically:

The HRPD AN notifies the PDSN to establish a data forwarding tunnel;

Notifying the HRPD of the forwarding address of the data forwarding tunnel by the PDSN

AN.

The data processing method according to any one of claims 3 to 4, wherein after the S-GW establishes the data forwarding tunnel between the PDSN and the eNodeB, the method further includes:

The S-GW starts a timer, and the timer expires to release the established data forwarding tunnel.

7. A data processing method, comprising the steps of:

When the user equipment switches from the initiating network to the receiving network, the gateway device of the receiving network notifies the receiving network and the user plane anchor network element of the initiating network to perform the dual-cast processing; the user plane anchor network element is according to the The notification simultaneously transmits data to the originating network and the receiving network.

8. The data processing method according to claim 7, wherein, when the receiving network is an HRPD network, and the originating network is E-UTRAN,

The gateway device of the receiving network notifies the receiving network and the user plane anchor network element of the initiating network as follows:

The HRPD AN in the HRPD network notifies the gateway device PDSN of the HRPD network; The PDSN sends the notification to the HRPD network and the user plane anchor network element PDN GW of the E-UTRAN.

The data processing method according to claim 8, wherein after the user plane anchor network element simultaneously sends data to the originating network and the receiving network, the method further includes:

When the handover of the terminal is completed, the PDSN notifies the PDN GW to send data only to the HRPD network.

The data processing method according to any one of claims 7 to 9, wherein the method further comprises:

The PDN GW starts a timer. After the timer expires, the PDN GW cancels the bi-cast and releases the originating network side resources.

A data processing device on the receiving network side, comprising: a handover initiating entity, configured to notify a gateway device of the network to create a data forwarding resource, and receive and receive a network side gateway device, when detecting that the terminal switches to the network. Sending a forwarding address and transmitting the forwarding address to the originating network;

12. A data processing device for initiating a network side, comprising: a handover processing entity, configured to acquire a receiving network acquisition device when the terminal switches to a receiving network;

A data processing device on the receiving network side, comprising: a handover initiating entity, configured to notify a gateway device of the network to perform a dual-cast processing when detecting that the terminal in the initiating network switches to the local network;