WO2011047609A1 - Method for realizing handoff pre-registration and system thereof - Google Patents

Abstract

A method and a system for realizing handover pre-registration are provided in the present invention. When a user equipment (UE) performs a handover pre-registration before handing-over from an original system to a target system, if the target system does not support that multiple Packet Data Network (PDN) connections exist with one sigle Access Point Name (APN), a pre-registration information is established only for the latest established PDN connection in the multiple PDN connections with the APN. After the user equipment establishes the pre-registration information, at the maintenance stage for the pre-registration information, if a new PDN connection is established in the source system or the latest established PDN connection is deleted from the source system, the pre-registration information is established for the latest established PDN connection in the current existing PDN connections with the APN.

Description

 Method and system for realizing handover pre-registration

 The present invention relates to the field of communications, and in particular, to a method and system for implementing handover pre-registration in a handover scenario.

Background technique

 First, the interconnection architecture

 The 3rd Generation Partnership Project (3GPP) evolved system architecture, Evolved Packet System (EPS), Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network) Universal Terrestrial Radio Access Network, Mobility Management Entity (MME), Serving Gateway (S-GW), Packet Data Network Gateway (P-GW) The Home Subscriber Server (HSS), the 3GPP Authentication and Authorization Accounting Server (referred to as the AAA server), and other supporting nodes, wherein the E-UTRAN is a 3GPP access network of the EPS system, and the internal includes many Evolved Node Core (Evolved Packet Core Network, EPC for short) is the core network of the EPS system, and the EPC includes network elements such as MME, S-GW and P-GW; MME Responsible for control plane related work; S-GW is the access gateway set up with E-UTRAN The P-GW is a border gateway between the EPS and the Packet Data Network (PDN). It is responsible for accessing the PDN and forwarding data between the EPS system and the PDN. See the upper area of the dotted line in Figure 1.

 The interconnection and interworking of the eHRPD (evolved high rate packet data) network, that is, the user equipment (User Equipment, UE for short) can access the EPS P-GW through eHRPD. And can achieve the UE switching back and forth between the two systems, the eHRPD system architecture is shown in the lower part of the dotted line in Figure 1.

Figure 1 shows a schematic diagram of the interconnection architecture of the E-UTRAN/EPS and eHRPD systems. The eHRPD system is composed of an HSGW (HRPD Serving Gateway, a high-rate packet data service gateway), HRPD-eAN (evolved access network), P-GW as the data anchor gateway (that is, P-GW in 3GPP EPS, in the interconnection scenario, the EPS system and the eHRPD system share the P-GW) Such as basic network elements. As the first hop of the terminal accessing the eHRPD core network, the HSGW is an access gateway device connected to the HRPD-eAN, responsible for user mobility management, context management, and forwarding data between the HRPD-eAN and the P-GW, responsible for Paging waits for data to be cached and forwarded, and so on. The P-GW is a data gateway that the terminal accesses the PDN through a 3GPP access network (such as E-UTRAN) and a non-3GPP access network (such as eHRPD), that is, whether the terminal UE accesses through the E-UTRAN access network or Through the eHRPD access network access, the uplink and downlink data transmission must pass through the data gateway P-GW and then communicate with the external PDN; when the terminal switches between 3GPP access (such as E-UTRAN) and non-3GPP access (such as eHRPD) When the P-GW acts as a gateway that does not change, it is an anchor point in the handover process. In order to implement multi-mode terminal access through different access systems, and to ensure the continuity of the service when the terminal switches in different access systems, some interfaces are added: S101 interface, S103 interface and S2a interface. The S2a interface transmits control signaling and service data between the HSGW and the P-GW, and uses the PMIPv6 protocol. When the UE is optimally switched from the E-UTRAN access system to the eHRPD access system, there is a mechanism for data forwarding and buffering, that is, transmission of authentication information and data forwarding information between the MME and the HRPD-eAN through the S101 interface, The S103 interface is used to forward the downlink data when the terminal is switched from the E-UTRAN system to the eHRPD system, and the forwarded downlink data is buffered in the HSGW.

 In the prior art, the step of the UE optimizing the handover from the E-UTRAN access system to the eHRPD access system is divided into two phases:

 Phase 1, pre-registration

 The UE detects that the current E-UTRAN radio signal starts to become weak, and the eHRPD radio signal is good. The UE prepares the eHRPD system for pre-registration before the official handover to the eHRPD, because the UE is a single-standby terminal (ie, UE). Multiple radio transmissions and receptions cannot be enabled at the same time. The eHRPD signaling in the pre-registration phase is transmitted to the HRPD-eAN and HSGW through the wireless signal encapsulated by the E-UTRAN and the S101 interface (for details, see the analysis of the existing processes).

After the pre-registration preparation is completed, the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE does not switch, and thus the UE pre-registration information in the eHRPD needs to be maintained. Second stage, switching

The UE detects that the current E-UTRAN signal cannot support the current service, and then officially switches to the eHRPD system. Since the UE has pre-registration information in the eHRPD system, it is quick and convenient for the UE to switch to the eHRPD system.

Figure 2 shows the process of optimizing handover of an existing UE from an E-UTRAN access system to an eHRPD access system, including:

 201. The UE accesses the EPC through the E-UTRAN and is in an Active state;

 202. The UE detects that the current E-UTRAN radio signal is weak by measuring the radio signal, and the eHRPD radio signal is good, and decides to initiate pre-registration to the eHRPD system;

 203. The UE establishes an eHRPD session with the HRPD-eAN;

 204. A data channel is established between the HRPD-eAN and the HSGW. Here, an A10 connection is established through Al l signaling;

 205. The UE accesses the authentication and authorization of the eHRPD system;

 206. The PDN connection information, the network layer negotiation of the PPP (Point to Point Protocol) session, the resource reservation and the bearer establishment are negotiated between the UE and the HSGW;

 By this step, the pre-registration of the UE in the eHRPD system has been completed.

 207. After the UE completes the pre-registration preparation, the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE does not switch, so that before the official handover, the UE is in the UE. The pre-registration information of the eHRPD needs to be maintained;

 The time interval between the completion of the pre-registration and the formal handover by the UE is uncertain, so the refresh and maintenance duration of the pre-registration information is also indefinite.

 The above steps belong to the first phase of the switch: Pre-registration phase.

 208. When the UE detects that the E-UTRAN signal is insufficient to support the current service, the UE officially switches from E-UTRAN to eHRPD.

This step 208 belongs to the second phase of the handover. The specific detailed operation is not discussed in detail because it has little relationship with the present invention. In the above operation, the eHRPD session establishment signaling between the UE and the HRPD-eAN, the authentication and authorization signaling between the UE and the HSGW, and the setup signaling of the PDN connection and the maintenance refresh of the pre-registration information are all through the eNB and the MME. Forwarding, carried by the E-UTRAN radio signal between the UE and the eNB, the signaling between the eNB and the MME, and the S101 signaling between the MME and the HRPD-eAN.

 Second, single APN (Access Point Name, access point name) Multi-PDN connection technology Single APN multi-PDN connection technology is a new feature of the new version of the 3GPP E-UTRAN system R9, it is R8 in the 3GPP E-UTRAN system Enhancements on the version. The 3GPP E-UTRAN R8 version supports that a terminal can access multiple PDNs through different APNs, establish multiple PDN connections, and access different PDNs. However, the terminal cannot access the same PDN multiple times through the same APN. The APN establishes multiple PDN connections. This feature has been enhanced in the R9 version of the 3GPP E-UTRAN system, that is, the same APN can be accessed to the same PDN multiple times, multiple PDN links can be established through the same APN, and a PDN connection cannot be identified through the APN alone. In order to distinguish multiple PDN connections, an APN+ linked bearer ID (LBI, linked bearer ID) is used to identify a PDN connection.

 The current standard protocol stipulates that if the UE establishes multiple PDN connections for an APN in an E-UTRAN system supporting a single APN multi-PDN connection, if the UE switches to non-3GPP, and the non-3GPP is an unsupported list APN multi-PDN connection technology system, so that only one PDN connection under the APN can be switched to the target eHRPD system, and the latest one, that is, the last established PDN connection, the remaining PDN connections will be discarded. .

 If the UE establishes multiple PDN connections for an APN in an E-UTRAN system supporting "single APN multi-PDN connection", if the UE switches to the eHRPD system, and the eHRPD system is a single APN multi-PDN connection technology is not supported. The system, how to achieve the switch is a problem to be solved. Summary of the invention

The technical problem to be solved by the present invention is to provide a method and system for implementing handover pre-registration. Under the E-UTRAN-eHRPD interconnection and interworking architecture, the UE does not support a single APN from an E-UTRAN system supporting a single APN multi-PDN connection. Multi-PDN connection technology for eHRPD system switching Pre-registration.

 In order to solve the above problem, the present invention provides a method for implementing handover pre-registration, including: when a user equipment performs handover pre-registration from a source system to a target system, if the target system does not support the existence of the same access point name (APN) A plurality of packet data network (PDN) connections establish pre-registration information only for the newly established PDN connection among all PDN connections under the APN.

 The foregoing method may also have the following feature: after the user equipment establishes the pre-registration information, if the user equipment establishes a new PDN connection under the APN from the source system, or the user equipment deletes the newly established PDN connection under the APN from the source system, Pre-registration information is established for the newly established PDN connection in the currently existing PDN connection under the APN.

 The foregoing method may further include the following steps: the step of the user equipment establishing pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN includes:

 After releasing the pre-registration information of the original PDN connection, the user equipment initiates a PDN connection pre-registration information establishment operation, and negotiates with the target system to establish pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN.

 The foregoing method may further have the following feature: the step of the user equipment releasing the pre-registration information of the original PDN connection comprises: the user equipment sending a device vendor defined network control protocol (VSNCP) termination request signaling to the high rate packet data serving gateway (HSGW), the HSGW The user equipment and the HSGW are released with the pre-registration information of the original PDN connection.

 The foregoing method may further include the following steps: the user equipment initiates a PDN connection pre-registration information establishment operation, and the step of establishing pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN includes: the user equipment and the high-rate packet data service gateway (HSGW) Mutually send device vendor defined network control protocol (VSNCP) configuration request/acknowledgement signaling to establish pre-registration information of the newly established PDN connection.

 The foregoing method may further include the following steps: the step of the user equipment establishing pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN includes:

The user equipment initiates a PDN connection pre-registration information establishment operation, and negotiates with the target system to modify the pre-registration information of the original PDN connection, or overwrites the pre-registration information of the original PDN connection with the newly established pre-registration information, so that the current existence exists under the APN. The newly established PDN connection in the PDN connection Establish pre-registration information.

 The foregoing method may also have the following features: the user equipment initiates a PDN connection pre-registration information establishment operation, and the step of overwriting the pre-registration information of the original PDN connection by modifying/updating the pre-registration information of the original PDN connection or creating new pre-registration information includes: The device and the High Rate Packet Data Serving Gateway (HSGW) mutually send Device Provider Definition Network Control Protocol (VSNCP) configuration request/acknowledgement signaling, modify/update/overwrite the pre-registration information of the original PDN connection.

 The foregoing method may also have the following feature: after the target system establishes pre-registration information for the newly established PDN connection in the PDN connection currently existing in the APN, the target system returns a message to the user equipment, where the message carries the newly established pre-registration information has been modified/ Overwrites the indication of pre-registration information established for the original PDN connection.

 The above method may also have the following features: The pre-registration information includes any combination of the following information:

PDN address, APN, traffic flow template (TFT), and quality of service (QoS) information. The present invention also provides a system for implementing handover pre-registration, comprising: a user equipment, a source system, and a target system, where:

 If the user equipment is configured to perform pre-registration of the PDN connection from the source system to the target system, if the target system does not support multiple PDN connections in the same APN, only the pre-registration of the newly established PDN connection in all PDN connections under the APN is established. information.

 The above system can also have the following characteristics:

 After the user equipment is further configured to establish the pre-registration information, in the maintenance phase of the pre-registration information, if the user equipment establishes a new PDN connection under the APN from the source system, or the user equipment deletes the newly established APN from the source system. The PDN connection establishes pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN.

 The above system can also have the following characteristics:

 The user equipment is further configured to release the pre-registration information of the original PDN connection, initiate a PDN connection pre-registration information establishment operation, and establish pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN.

 The above system can also have the following characteristics:

The user equipment is also set to send equipment agreement to the High Rate Packet Data Serving Gateway (HSGW) The network control protocol (VSNCP) terminates the request signaling, and after the HSGW responds to the user equipment with the VSNCP termination acknowledgment signaling, releases the pre-registration information of the original PDN connection.

 The above system can also have the following characteristics:

 The user equipment is also arranged to transmit Device Provider Defined Network Control Protocol (VSNCP) configuration request/acknowledgement signaling to the High Rate Packet Data Serving Gateway (HSGW) to establish pre-registration information for the newly established PDN connection.

 The above system can also have the following characteristics:

 The user equipment is further configured to initiate a PDN connection pre-registration information establishment operation, by modifying/updating the pre-registration information of the original PDN connection, or newly establishing the pre-registration information to overwrite the pre-registration information of the original PDN connection, which is the PDN currently existing under the APN. Pre-registration information is established by the newly established PDN connection in the connection.

 The above system can also have the following characteristics:

 The user equipment is further arranged to mutually transmit a Subscriber Defined Network Control Protocol (VSNCP) configuration request/acknowledgement signal to the High Rate Packet Data Serving Gateway (HSGW) to modify/update/overwrite the pre-registration information of the original PDN connection.

 The above system can also have the following characteristics:

 The target system is configured to: after establishing pre-registration information for the newly established PDN connection in the currently existing PDN connection of the APN, return a message to the user equipment, where the message carries the newly established pre-registration information has been modified/overwritten as the original An indication of the pre-registration information established by the PDN connection.

 The above system can also have the following characteristics:

 The pre-registration information includes any combination of the following information:

 PDN address, APN, traffic flow template TFT, and quality of service QoS information.

The method and system of the present invention can establish pre-registration information for the newly established PDN connection of the user equipment in multiple PDN connections under the same APN, thereby ensuring that the newly established PDN connection is switched to the target system. BRIEF abstract

 The drawings are intended to provide a further understanding of the invention, and are intended to be illustrative of the invention. In the drawing:

 1 is an architectural diagram of eHRPD-E-UTRAN interconnection according to the related art;

 2 is a flowchart of a UE switching from an E-UTRAN to an eHRPD according to the related art; FIG. 3 is a flowchart of a method according to an embodiment of the present invention;

 4 is a flow chart of Embodiment 2 of the method according to the present invention;

 Figure 5 is a flow chart of a third embodiment of the method in accordance with the present invention.

Preferred embodiment of the invention

 The main idea of the present invention is: Under the E-UTRAN-eHRPD interconnection architecture, a UE establishes multiple PDN connections under an APN in an E-UTRAN access system, when the UE switches from E-UTRAN to eHRPD, If the eHRPD is an access system that does not support a single APN multi-PDN connection, the pre-registration information is established only for the newly established PDN connection of all PDN connections of the UE under the APN.

 The method for implementing handover pre-registration according to the present invention includes:

 If the UE performs handover pre-registration before switching from the source system to the target system, if the target system does not support multiple packet data network (PDN) connections under the same access point name (APN), only the UE is under the same APN. Pre-registration information is established on the newly established PDN connection in all the PDN connections. The UE has one or more PDN connections under the same APN. As a special case, if there is only one PDN connection in the APN, the unique PDN connection is Establish pre-registration information.

 Further, after the pre-registration information is established, in the maintenance phase of the pre-registration information, if the UE establishes a new PDN connection from the source system under the APN, or the UE deletes the source system from the source system The newly established PDN connection among all PDN connections under the APN, the UE establishes pre-registration information from the target system for the newly established PDN connection in the currently existing PDN connection under the APN.

In the case where the eHRPD system does not support a single APN multi-PDN connection, a new pre-registration is established. In the case of the information, the original pre-registration information needs to be deleted, and the UE establishes pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN from the target system, and can be established in any of the following two ways:

 The UE initiates a pre-registration information release operation through the PDN connection, and negotiates with the target system to release the pre-registration information of the original PDN connection (that is, the PDN connection with the pre-registration information), the UE initiates a PDN connection pre-registration information establishment operation, and negotiates with the target system. Establishing pre-registration information for the newly established PDN connection in the PDN connection currently existing under the APN in the source system;

 Alternatively, the UE directly initiates a PDN connection pre-registration information establishment operation, negotiates with the target system, and modifies the pre-registration information of the original PDN connection or overwrites the pre-registration information of the original PDN connection by using the newly established pre-registration information, as the source system. The newly established PDN connection in the currently existing PDN connection under the APN establishes pre-registration information. Further, after the target system establishes pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN, the response message is returned to the UE, and the newly created pre-registration information is modified/overwritten in the response message. An indication of pre-registration information established for the original PDN connection.

Embodiment 1

 Figure 3 is a flow chart of an embodiment of the method according to the present invention, the detailed steps are described as follows:

 301. The UE accesses the EPC through the E-UTRAN and is in an Active state; multiple PDN connections are established for one APN. As a special case, there may be only one PDN connection under the APN.

 302. The UE detects that the current E-UTRAN radio signal is weak by measuring the radio signal, and the eHRPD radio signal is very good, and decides to initiate pre-registration to the eHRPD system.

 303. The UE establishes an eHRPD session with the HRPD-eAN.

 304. A data channel is established between the HRPD-eAN and the HSGW. Here, the A10 connection is established through Al l signaling.

 305. The UE accesses the authentication and authorization of the eHRPD system.

306. In a plurality of PDN connections in the same APN, the UE selects the newly established PDN connection to initiate pre-registration; as a special case, if there is only one PDN connection in the APN, A PDN connection establishes pre-registration information.

 307. The PDN connection information is negotiated between the UE and the HSGW, the network layer negotiation of the PPP session, resource reservation and bearer establishment;

 Specifically, the UE sends a device-defined network control protocol configuration request (VSNCP-configure-Request) message to the HSGW, and the HSGW responds to the UE with a device-defined network control protocol configuration confirmation (VSNCP-configure-Ack) message. The HSGW sends a VSNCP-configure-Request message to the UE, and the UE responds to the HSGW with a VSNCP-configure-Ack message. When the HSGW sends the VSNCP-configure-Request message to the UE, the HSGW may directly occur after the HSGW receives the VSNCP-configure-Request message of the UE, and does not need to wait for the VSNCP-configure-Ack to be sent to the UE, that is, the HSGW. The VSNCP-configure-Request and VSNCP-configure-Ack messages sent to the UE have no necessary relationship. The PDN is connected to the IPv4 address. Optionally, the UE performs IPv4 address negotiation with the network side through a DHCP (Dynamic Host Configuration Protocol) procedure. If the PDN connection has an IPv6 address, optionally, the UE passes the RS/ The RA (Router Solicitation I route advertisement message) message negotiates with the network side for IPv6 address.

 The pre-registration information of the PDN connection described above includes, but is not limited to, a PDN address, an APN, a TFT (traffic flow template), and a QoS (quality of service) information.

308. After the UE completes the pre-registration preparation, the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE does not switch, and thus, the UE pre-registration information in the eHRPD. Need to maintain;

 The time interval between the completion of the pre-registration and the formal handover by the UE is uncertain, so the refresh and maintenance duration of the pre-registration information is also indefinite.

 The above steps belong to the first phase of the switch: Pre-registration phase.

309. When the UE detects that the E-UTRAN signal is insufficient to support the current service, the UE is officially Switch from E-UTRAN to eHRPD.

 In the above operation, the eHRPD session establishment signaling between the UE and the HRPD-eAN, the authentication and authorization signaling between the UE and the HSGW, and the establishment of the PDN connection signaling and the pre-registration information are all refreshed by εΝΒ, ΜΜΕ Forwarding, carried by the E-UTRAN radio signal between the UE and the eNB, the signaling between the eNB and the MME, and the S 101 signaling between the MME and the HRPD-eAN.

Embodiment 2

 Figure 4 is a flow chart of the second embodiment of the method according to the present invention, and the detailed steps are described below:

 401. The UE accesses the EPC through the E-UTRAN and is in an Active state; multiple PDN connections are established for one APN. As a special case, there may be only one PDN connection under the APN.

 402. The UE detects that the current E-UTRAN radio signal is weak by measuring the radio signal, and the eHRPD radio signal is good, and decides to initiate pre-registration to the eHRPD system;

 403. The UE establishes an eHRPD session with the HRPD-eAN.

 404. A data channel is established between the HRPD-eAN and the HSGW. Here, an A10 connection is established through Al 1 signaling;

 405. The UE accesses the authentication and authorization of the eHRPD system.

 406. In multiple PDN connections under the same APN, the UE selects the newly established PDN connection to initiate pre-registration for it; as a special case, if there is only one PDN connection under the APN, pre-registration information is established for the unique PDN connection.

 407. The PDN connection information is negotiated between the UE and the HSGW, the network layer negotiation of the PPP session, resource reservation and bearer establishment;

 408. After the UE completes the pre-registration preparation, the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE does not switch, and thus, the UE pre-registration information in the eHRPD. Need to maintain;

During the maintenance phase of the pre-registration information, the UE may establish a new PDN connection under the APN where the PDN connection already exists, so the PDN connection with the pre-registration information is not the latest PDN. Connected, the newly established PDN connection is the latest PDN connection, and pre-registration information should be established for the PDN connection just established.

 409. The UE initiates a request to establish pre-registration information for the newly established PDN connection by using a similar operation of step 407. After receiving the request, the HSGW finds that there is already a pre-registration information of the PDN connection under the APN, because the eHRPD system is not The "single APN multi-PDN connection" is supported. Therefore, the HSGW considers this to be an error operation and rejects the establishment of the PDN connection pre-registration information. The reason for the error is: The PDN connection already exists under the APN.

 This step is optional, because the UE knows the capability of the HSGW after a 409-step operation, and if the PDN connection pre-registration information is replaced in multiple PDN connections under another APN again. The UE already knows that the HSGW does not support the "single APN multi-PDN connection" technology, and the process directly jumps to step 410.

 410. The UE connects to the pre-registration information release operation through the PDN, and negotiates with the HSGW to release the pre-registration information of the PDN connection with the pre-registration information.

 The PDN connection pre-registration information release operation can be implemented by a PDN connection release and a resource deletion operation.

 411. The UE establishes pre-registration information for the PDN connection just established through the operation steps of the same type 407.

 Similar to the above description, this stage only completes the pre-registration, and the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE will not switch, so that the UE is in the eHRPD. Pre-registration information also requires constant maintenance;

 The time interval between the completion of the pre-registration and the formal handover by the UE is uncertain, so the refresh and maintenance duration of the pre-registration information is also indefinite.

 The above steps belong to the first phase of the switch: Pre-registration phase.

 412. When the UE detects that the E-UTRAN signal is insufficient to support the current service, the UE officially switches from E-UTRAN to eHRPD.

In the above operation, the eHRPD session establishment signaling between the UE and the HRPD-eAN, the authentication and authorization signaling between the UE and the HSGW, and the establishment of the PDN connection signaling and the pre-registration information are all refreshed by εΝΒ, ΜΜΕ Forwarding, E-UTRAN wireless signal between the UE and the eNB, The signaling between the eNB and the MME is carried by the S 101 signaling between the MME and the HRPD-eAN.

Embodiment 3

 Figure 5 is a third embodiment of the method according to the present invention. The detailed steps are described below:

 501. The UE accesses the EPC through the E-UTRAN and is in an Active state; multiple PDN connections are established for one APN. As a special case, there may be only one PDN connection under the APN.

 502. The UE detects that the current E-UTRAN radio signal is weak by measuring the radio signal, and the eHRPD radio signal is good, and decides to initiate pre-registration to the eHRPD system;

 503. The UE establishes an eHRPD session with the HRPD-eAN.

 504. A data channel is established between the HRPD-eAN and the HSGW. Here, an A10 connection is established through Al l signaling;

 505. The UE accesses the authentication and authorization of the eHRPD system.

 506. In multiple PDN connections under the same APN, the UE selects the newly established PDN connection to initiate pre-registration for it; as a special case, if there is only one PDN connection under the APN, pre-registration information is established for the unique PDN connection.

 507. The PDN connection information is negotiated between the UE and the HSGW, the network layer negotiation of the PPP session, resource reservation and bearer establishment;

 508. Because the UE does not necessarily switch to the eHRPD system immediately after the UE prepares for pre-registration, the UE will not switch if the wireless signal of the E-UTRAN can support the current service.

The pre-registration information of the UE in the eHRPD needs to be maintained;

 During the maintenance phase of the pre-registration information, the UE may establish a new PDN connection under the APN where the PDN connection already exists. Therefore, the PDN connection with the pre-registration information is not the latest PDN connection, and the newly established PDN connection is The latest PDN connection should establish pre-registration information for the PDN connection just established.

509. Because the eHRPD system does not support the single APN multi-PDN connection, the UE establishes pre-registration information for the newly established PDN connection by using the same steps as step 507. 510. After receiving the establishment request of the PDN connection pre-registration information, the HSGW establishes pre-registration information for the latest PDN connection by modifying or using the newly established pre-registration information to overwrite the pre-registration information established by the original PDN connection.

 Optionally, after the PDN connection pre-registration information is successfully established, the HSGW returns a response message to the UE, where the response message carries an indication that the newly created PDN connection pre-registration information has been modified/overwritten to the pre-registration information established by the original PDN connection.

 The execution order of steps 509 and 510 above is as follows: After the 509 initiates the request, step 510 performs the operation; after the step 510 completes the operation, the response is sent to the UE through the reply signal of step 509.

 Similar to the above description, this stage only completes the pre-registration, and the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE will not switch, so that the UE is in the eHRPD. Pre-registration information also requires constant maintenance;

 The time interval between the completion of the pre-registration and the formal handover by the UE is uncertain, so the refresh and maintenance duration of the pre-registration information is also indefinite.

 The above steps belong to the first phase of the switch: Pre-registration phase.

 511. When the UE detects that the E-UTRAN signal is insufficient to support the current service, the UE officially switches from E-UTRAN to eHRPD.

 In the above operation, the eHRPD session establishment signaling between the UE and the HRPD-eAN, the authentication and authorization signaling between the UE and the HSGW, and the establishment of the PDN connection signaling and the pre-registration information are all refreshed by εΝΒ, ΜΜΕ Forwarding, carried by the E-UTRAN radio signal between the UE and the eNB, the signaling between the eNB and the MME, and the S 101 signaling between the MME and the HRPD-eAN.

Embodiment 4

This embodiment is very similar to the second embodiment. The difference is that in the second embodiment, the UE newly creates a PDN connection in the maintenance phase of the pre-registration information. In this embodiment, the UE is from the EPS during the maintenance phase of the pre-registration information. The newly established PDN connection among multiple PDN connections corresponding to an APN is deleted in the system. In this scenario, the UE also needs to establish pre-registration information for the newly established PDN connection in the PDN connection currently existing under the APN. The flow chart can be seen in Figure 4, and the differences will be explained in the description of the steps below. 601-607, with steps 401-407;

 608, corresponding to step 408 in the figure, but different, here should be changed: the UE disconnects the PDN connection that has established the pre-registration information from the EPS system from the connection corresponding to multiple PDNs;

 After the UE completes the pre-registration preparation, the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE will not switch, so the UE pre-registration information in the eHRPD needs to be maintained. ;

 During the maintenance phase of the pre-registration information, the UE may delete the PDN connection that has established the pre-registration information from the EPS system under the APN corresponding to multiple PDN connections. Therefore, the newly established PDN connection in the PDN connection currently existing under the APN should be selected. , establish pre-registration information for it.

 609. Skip the figure 409 does not execute, only perform the same operation as step 410 in the figure;

 610. The UE establishes pre-registration information for the newly established PDN connection in the currently existing PDN connection by using the same steps as step 607.

 Similar to the above description, this stage only completes the pre-registration, and the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE will not switch, so that the UE is in the eHRPD. Pre-registration information also requires constant maintenance;

 The time interval between the completion of the pre-registration and the formal handover by the UE is uncertain, so the refresh and maintenance duration of the pre-registration information is also indefinite.

 The above steps belong to the first phase of the switch: Pre-registration phase.

 611. Same as step 412.

Embodiment 5

This embodiment is very similar to the third embodiment. The difference is that in the third embodiment, the UE newly creates a PDN connection in the maintenance phase of the pre-registration information. In this embodiment, the UE is from the EPS during the maintenance phase of the pre-registration information. The newly established PDN connection among multiple PDN connections corresponding to an APN is deleted in the system. In this scenario, the UE needs to establish pre-registration information for the newly established PDN connection in the PDN connection currently existing under the APN. The flow chart can be seen in Figure 5, and the differences will be explained in the following step description. 701-707, the same steps 501 - 507;

 708, corresponding to step 508 in the figure, but different, here should be changed to: the UE disconnects the PDN connection that has established the pre-registration information from the EPS system from the connection corresponding to the multiple PDNs;

 After the UE completes the pre-registration preparation, the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE will not switch, so the UE pre-registration information in the eHRPD needs to be maintained. ;

 During the maintenance phase of the pre-registration information, the UE may delete the PDN connection that has established the pre-registration information from the EPS system under the APN corresponding to the multiple PDN connections. Therefore, the PDN connection newly established by the PDN currently existing under the APN should be selected. Establish pre-registration information for it.

 709. Because the eHRPD system does not support single APN multi-PDN connections, the UE establishes pre-registration information for the newly established PDN connection in the currently existing PDN connection through the operation of class synchronization 707.

 710. After receiving the establishment request of the PDN connection pre-registration information, the HSGW establishes pre-registration information for the current latest PDN connection by modifying or using the newly established pre-registration information to overwrite the original PDN connection pre-registration information.

 Optionally, after the PDN connection registration information is successfully established, the HSGW carries an indication in the message that is sent to the UE, where the indication identifies that the newly created PDN connection pre-registration information has overwritten the pre-registration information of the original PDN connection.

 The execution order of steps 709 and 710 above is as follows: After the request is initiated by 709, the operation is performed in step 710; after the operation is completed in step 710, the response is sent to the UE through the reply signaling of step 709.

 Similar to the above description, this stage only completes the pre-registration, and the UE does not necessarily switch to the eHRPD system immediately. As long as the E-UTRAN wireless signal can support the current service, the UE will not switch, so that the UE is in the eHRPD. Pre-registration information also requires constant maintenance;

 The time interval between the completion of the pre-registration and the formal handover by the UE is uncertain, so the refresh and maintenance duration of the pre-registration information is also indefinite.

 The above steps belong to the first phase of the switch: Pre-registration phase.

 711. Same as step 511.

For the foregoing embodiment, the operation of the UE to negotiate the establishment of the pre-registration information with the HSGW is specifically: The UE sends a Device Vendor Defined Network Control Protocol Configuration Request (VSNCP-configure-Request) message to the HSGW, and the HSGW responds to the UE with a Device Provider Defined Network Control Protocol Configuration Acknowledgement (VSNCP-configure-Ack) message. The HSGW sends a VSNCP-configure-Request message to the UE, and the UE responds to the HSGW with a VSNCP-configure-Ack message. When the HSGW sends the VSNCP-configure-Request message to the UE, the HSGW may directly occur after the HSGW receives the VSNCP-configure-Request message of the UE, and does not need to wait for the VSNCP-configure-Ack to be sent to the UE, that is, the HSGW. The VSNCP-configure-Request and VSNCP-configure-Ack messages sent to the UE have no necessary relationship. The PDN is connected to the IPv4 address. Optionally, the UE performs IPv4 address negotiation with the network side through a DHCP (Dynamic Host Configuration Protocol) procedure. If the PDN connection has an IPv6 address, optionally, the UE passes the RS/ The RA (Router Solicitation I route advertisement message) message negotiates with the network side for IPv6 address.

 For the foregoing embodiment, the operation of the UE to negotiate the release of the pre-registration information with the HSGW is specifically:

The UE sends a device-defined network control protocol termination request (VSNCP-terminate-Request) signaling to the HSGW, and the HSGW responds to the user equipment with a device-defined network control protocol termination acknowledgement (VSNCP-terminate-Ack) signaling, and the two parties release the Pre-registration information for PDN connections.

 For the foregoing embodiment, the message process in which the UE negotiates to update/modify/cover the pre-registration information with the HSGW is the same as the process of establishing the operation, which is different in the internal processing of the UE and the HSGW. Establishment refers to the establishment by nothing. Update/modification refers to making changes on the basis of the original. Coverage refers to the creation of new ones while deleting the old ones.

 The pre-registration information of the PDN connection described above includes, but is not limited to, a PDN address, an APN, a TFT (traffic flow template), and a QoS (quality of service) information.

In summary, under the E-UTRAN-eHRPD interconnection architecture, if there are multiple PDN connections under a single APN in the E-UTRAN access system, when the UE is from E-UTRAN to eHRPD During the handover, if the eHRPD is an access system that does not support a single APN multi-PDN connection, it is guaranteed that pre-registration information is established only for the newly established PDN connection under the APN, and even if a new PDN connection is established, the pre-registration can be guaranteed. The information is updated and the pre-registration information is always guaranteed to be the latest established PDN connection.

 In addition, the present invention is not limited to switching from the E-UTRAN system to the eHRPD system, and is also suitable from other access systems supporting a single APN multi-PDN connection to other access systems not supporting a single APN multi-PDN connection. Switch pre-registration.

The present invention also provides a system for implementing handover pre-registration, comprising: a user equipment, a source system, and a target system, where:

 If the user equipment is used to perform pre-registration before the handover from the source system to the target system, if the target system does not support multiple PDN connections under the same APN, only the newly established PDN connection in all PDN connections under the APN is established. Pre-registration information.

 After the user equipment is used to establish the pre-registration information, in the maintenance phase of the pre-registration information, if the new PDN connection under the APN is established from the source system, or the newly established PDN connection under the APN is deleted from the source system, The newly established PDN connection establishment pre-registration information in the currently existing PDN connection under the APN.

 The user equipment is further configured to perform a PDN connection pre-registration information release operation, negotiate with the target system, and after the pre-registration information of the original PDN connection is released, initiate a PDN connection pre-registration information establishment operation, and negotiate with the target system to be current for the APN. The newly established PDN connection in the existing PDN connection establishes pre-registration information.

The user equipment is further configured to directly initiate a PDN connection pre-registration information establishment operation, requesting the target system to establish pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN; the target system is configured to initiate a PDN connection pre-registration on the user equipment. The newly established PDN connection in the PDN connection currently existing under the APN by modifying the pre-registration information of the original PDN connection or using the method of overwriting the pre-registration information of the original PDN connection with the newly established pre-registration information. Establishing pre-registration information; and further, after establishing pre-registration information for the newly established PDN connection in the PDN connection currently existing under the APN, returning a response message to the user equipment, the response cancellation The information carrying the newly established pre-registration information has modified/overwritten the indication of the pre-registration information established for the original PDN connection.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

 The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to 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.

Industrial Applicability The technical solution of the present invention can establish pre-registration information for the newly established PDN connection of the user equipment in multiple PDN connections under the same APN, thereby ensuring that the newly established PDN connection is switched to the target system.

Claims

Claim  1. A method for implementing handover pre-registration, comprising:  When the user equipment performs the handover pre-registration from the source system to the target system, if the target system does not support multiple packet data network PDN connections under the same access point name APN, only the multiple of the APNs are Pre-registration information is established by the newly established PDN connection in the PDN connection.  2. The method of claim 1 further comprising:  After the user equipment establishes the pre-registration information, if the user equipment establishes a new PDN connection under the APN from the source system, or the user equipment deletes the latest APN from the source system. The established PDN connection establishes pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN.  The method of claim 2, wherein the step of the user equipment establishing pre-registration information for the newly established PDN connection in the PDN connection currently existing in the APN includes:  After the user equipment releases the pre-registration information of the original PDN connection, the PDN connection pre-registration information establishing operation is initiated, and pre-registration information is established for the newly established PDN connection in the PDN connection currently existing in the APN.  The method of claim 3, wherein the step of the user equipment releasing the pre-registration information of the original PDN connection comprises: the user equipment transmitting the equipment provider defined network control protocol VSNCP to the high rate packet data serving gateway HSGW Requesting signaling, the HSGW sends a VSNCP termination confirmation signaling to the user equipment, and the user equipment and the HSGW release pre-registration information of the original PDN connection.  The method of claim 3, wherein the user equipment initiates a PDN connection pre-registration information establishing operation, and the step of establishing pre-registration information for the newly established PDN connection in the currently existing PDN connection in the APN includes: The user equipment and the high-rate packet data serving gateway HSGW mutually send a device-defined network control protocol VSNCP configuration request/acknowledgement signaling, and establish pre-registration information of the newly established PDN connection.  The method of claim 2, wherein the step of the user equipment establishing pre-registration information for the newly established PDN connection in the PDN connection currently existing under the APN includes: The user equipment initiates a PDN connection pre-registration information establishment operation, by modifying/updating the original PDN Pre-registration information of the connection, or new pre-registration information to cover the pre-registration information of the original PDN connection, and establish pre-registration information for the newly established PDN connection in the currently existing PDN connection under the APN.  The method of claim 6, wherein the user equipment initiates a PDN connection pre-registration information establishment operation, and overwrites the pre-registration information of the original PDN connection, or creates a new pre-registration information to overwrite the pre-PDN connection pre-registration. The step of registering information includes: the user equipment and the high rate request/acknowledgement signaling, modifying/updating/covering the pre-registration information of the original PDN connection.  8. The method of claim 6 further comprising:  After the target system establishes pre-registration information for the newly established PDN connection in the currently existing PDN connection in the APN, the message is returned to the user equipment; wherein the message carries the newly established pre-registration information has been modified/ Update/overwrite the indication of pre-registration information established for the original PDN connection.  The method according to any one of claims 1 to 8, wherein the pre-registration information includes any combination of the following information:  PDN address, APN, traffic flow template TFT, and quality of service QoS information.  10. A system for implementing handover pre-registration, comprising: a user equipment, a source system, and a target system, wherein:  The user equipment is configured to perform a handover pre-registration from the source system to the target system, if the target system does not support a plurality of packet data network PDN connections under the same access point name APN, Pre-registration information is established for the newly established PDN connection among all PDN connections under the APN.  11. The system of claim 10, wherein  The user equipment is further configured to: after the pre-registration information is established, if the user equipment establishes a new PDN connection under the APN from the source system, or the user equipment is deleted from the source system. The newly established PDN connection under the APN establishes pre-registration information for the newly established PDN connection in the PDN connection currently existing under the APN. 12. The system of claim 10, wherein The user equipment is further configured to: initiate a PDN connection pre-registration information establishment operation, and establish pre-registration information for the newly established PDN connection in the currently existing PDN connection in the APN.  13. The system of claim 12, wherein  The user equipment is further configured to send a device vendor defined network control protocol VSNCP termination request signaling to the high rate packet data serving gateway HSGW, and release the original PDN after the HSGW responds to the user equipment with the VSNCP termination acknowledgement signaling. Pre-registration information for the connection.  14. The system of claim 12, wherein  The user equipment is further configured to send a device-defined network control protocol VSNCP configuration request/acknowledgement signal to the high-rate packet data serving gateway HSGW to establish pre-registration information of the newly established PDN connection.  15. The system of claim 11 wherein  The user equipment is further configured to initiate a PDN connection pre-registration information establishment operation, by modifying/updating the pre-registration information of the original PDN connection, or by creating a new pre-registration information to overwrite the pre-registration information of the original PDN connection, which is currently existing under the APN. Pre-registration information is established by the newly established PDN connection in the PDN connection.  16. The system of claim 15 wherein  The user equipment is further configured to send a device-defined network control protocol VSNCP configuration request/acknowledgement signal to the high-rate packet data serving gateway HSGW to modify/update/overwrite the pre-registration information of the original PDN connection.  17. The system of claim 15 wherein:  The target system is configured to: after establishing pre-registration information for the newly established PDN connection in the PDN connection currently existing in the APN, return a message to the user equipment, where the message carries the newly established pre-registration information. Modify/overwrite the indication of pre-registration information established for the original PDN connection.  The system according to any one of claims 10-17, wherein the pre-registration information includes any combination of the following information:  PDN address, APN, traffic flow template TFT, and quality of service QoS information.