WO2013020283A1

WO2013020283A1 - Method, data gateway and system for processing addresses

Info

Publication number: WO2013020283A1
Application number: PCT/CN2011/078226
Authority: WO
Inventors: 周伟; 夏旭
Original assignee: 华为技术有限公司
Priority date: 2011-08-10
Filing date: 2011-08-10
Publication date: 2013-02-14
Also published as: CN103098445A; CN103098445B

Abstract

The present invention relates to a method, device and system for processing addresses. Wherein, a method comprises: a data gateway obtains the address processing ability of a user equipment; when the user equipment does not have the Internet Protocol version 6 (IPv6) processing ability for 3^rd Generation Partnership Project (3GPP), the data gateway performs an address confliction detection processing flow. By employing the data gateway to obtain the address processing ability of the user equipment and to further perform the address confliction detection processing flow for the user equipment having no IPv6 processing ability for 3GPP, the method solves the problem of IPv6 address confliction caused by the non-3GPP standard user equipment trying to access an 3GPP network, and ensures that the 3GPP network can work normally.

Description

Method for processing addresses, data gateway and system

The present invention relates to the field of communications technologies, and in particular, to a method, a data gateway, and a system for processing an address. Background technique

The IP address is the basis for data communication between devices in the IP network. Each device connected to the IP network must have a corresponding IP address. The IP address can be used to access devices in the IP network. Therefore, it is necessary to connect to the IP network. Each device performs address allocation and needs to ensure that the assigned IP address is unique in the same IP network, so that the address to be accessed can be uniquely determined by addressing the IP address.

IPv6 (Internet Protocol version 6) is a next-generation IP protocol designed by the Internet Engineering Task Force (IETF) to replace IPv4 (Internet Protocol version 4, 4th Edition Internet Protocol).

For the IPv6 address allocation technology of the device, there are mainly two main implementation technologies, namely stateless address autoconfiguration and stateful address autoconfiguration, both of which are formulated by the IETF. The IPv6 address auto-configuration scheme is the most widely used IPv6 address allocation method. In this address allocation mode, the device side such as the user equipment does not need to be configured, and only a small configuration is required on the router, and no additional server is needed, thereby achieving the purpose of automatically configuring the IPv6 address. In this way, the user equipment can form a global IPv6 address through the IPv6 prefix information in the router advertisement and the information that the user equipment has.

With the development of IPv6 technology, in the mobile network, 3GPP (3rd Generation Partnership Project) has developed an IPv6 address allocation scheme for 3GPP networks. In this solution, the network element having the IP address allocation function sends a link local address interface identifier and an IPv6 prefix to the user equipment to enable the user equipment to generate a global IPv6 address. The inventor found that when a user equipment other than the 3GPP standard accesses the 3GPP network, an IPv6 address conflict may occur. Summary of the invention

Embodiments of the present invention provide a method, a data gateway, and a system for processing an address, which are used to solve the problem of IPv6 address conflict caused by a user equipment of a non-3GPP standard accessing a 3GPP network.

An embodiment of the present invention provides a method for processing an address, including:

The data gateway acquires an address processing capability of the user equipment;

When the user equipment does not have the processing capability of IPv6 (Internet Protocol version 6, 6th Edition Internet Protocol) of 3GPP (3rd Generation Partnership Project), the data gateway performs an address conflict detection processing flow.

An embodiment of the present invention further provides a data gateway, including:

An obtaining module, configured to acquire an address processing capability of the user equipment;

The processing module is configured to perform an address conflict detection processing process when the user equipment does not have the processing capability of the IPv6 of the 3GPP.

An embodiment of the present invention further provides a system for processing an address, including:

User equipment, used to send address processing capabilities;

The data gateway is configured to obtain an address processing capability of the user equipment. When the user equipment does not have the processing capability of the IPv6 of the 3GPP, the address conflict detection processing procedure is performed.

The embodiment of the present invention obtains the address processing capability of the user equipment by using the data gateway, and performs an address conflict detection processing procedure on the user equipment that does not have the IPv6 processing capability of the 3GPP, and overcomes the IPv6 caused by the non-3GPP standard user equipment accessing the 3GPP network. The problem of address conflict guarantees the normal operation of the 3GPP network. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will be true. The drawings used in the examples or the description of the prior art are briefly introduced. It is obvious that the drawings in the following description are only some embodiments of the present invention, and are not creative to those skilled in the art. Other drawings can also be obtained from these drawings on the premise of labor.

FIG. 1 is a schematic diagram of an IPv6 address allocation process for a 3GPP network according to an embodiment of the present invention;

2 is a first method for processing an address according to an embodiment of the present invention;

FIG. 3 is a second method for processing an address according to an embodiment of the present invention;

4 is a third method for processing an address according to an embodiment of the present invention;

FIG. 5 is a first gateway device according to an embodiment of the present invention;

FIG. 6 is a second type of gateway device according to an embodiment of the present invention;

FIG. 7 is a third gateway device according to an embodiment of the present invention;

FIG. 8 is a first system for processing an address according to an embodiment of the present invention;

FIG. 9 is a second system for processing an address according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without the creative work are all within the scope of the present invention.

The network architecture and the service scenario described in the following embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention. The evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

With the advent of the mobile broadband era, users need to use broadband access services anytime and anywhere, which puts higher demands on mobile communication networks, such as higher transmission rate, smaller delay and higher system capacity. . In order to maintain the advantages of the 3GPP network, the 3GPP standards organization launched the Long Term Evolution (LTE) and system architecture evolution (System) at the end of 2004. Architecture Evolution, referred to as: SAE) Research and standardization work for the two major programs. Under the guidance of the SAE evolution plan, a new mobile communication network framework is defined, which separates the control plane and the data plane, and only retains the packet domain, called the Evolved Packet System (EPS).

The core part of the evolved packet system (Evolved Packet Core, EPC for short) mainly includes MME (Mobility Management Entity), S-GW (Serving Gateway), and PDN-GW (Packet Data Network Gateway). Gateway) three logical functions, where the MME is a mobility management network element, responsible for control plane functions such as user and session management, including NAS (Non-Access Stratum) signaling and its security, S-GW and The selection of the network element such as the PDN-GW, the tracking area list management, and the mobility management of the UE (User Equipment) in the idle state can correspond to the UMTS (Universal Mobile Telecommunications System) system. The control plane part of the SGSN (Serving GPRS Support Node); the S-GW is mainly responsible for data transmission, forwarding and route switching functions of the UE user plane, and can correspond to the data plane part of the SGSN in the UMTS system; PDN- The GW is responsible for user address allocation, policy control, and enforcement of charging rules and lawful interception. Related features. In addition, an HSS (Home Subscriber Server) is used for storing user subscription information and a Policy and Charging Rules Function (PCRF) for providing policy and charging control rules.

Since the EPC has adopted the all-IP flat architecture, when the UE needs to establish a PDN connection, it first needs to obtain an available IP address and use this address to communicate with the external network. Address allocation is a necessary step for the UE to create a PDN connection. With the evolution of IPv4 to IPv6, the allocation of IPv6 addresses has become more and more important in 3GPP systems.

Figure 1 shows a flow chart for IPv6 address allocation for a 3GPP network. As shown in Figure 1, the specific process is as follows:

101: The UE sends an attach request message to the MME.

Specifically, after the UE is powered on, an attach request is initiated, and the address type is included in the attach request message. The address type is IPv6 PDN Type and is sent to the MME. The IPv6 PDN Type indicates that the PDN connection type is IPv6.

102: The MME sends a create session request message to the PDN-GW.

Specifically, the MME initiates a session creation request to the S-GW, and reaches the PDN-GW through the S-GW. The Create Session Request message includes the IPv6 PDN Type received by the MME from the UE.

103: The PDN-GW sends a create session response message to the MME.

Specifically, the PDN-GW sends a Create Session Response message to the S-GW, and reaches the PDN-GW through the S-GW. The PDN Address in the Create Session Response message includes the PDN-GW allocated to the UE. Link local address interface identifier; link local address interface identifier can be used for the UE to generate a link local address, and the link local address interface identifier assigned by the PDN-GW to the UE and the link local address interface identifier of the PDN-GW itself Differently, it is ensured that the link local address generated by the user equipment is different from the link local address of the PDN-GW.

104: The MME sends an attach accept message to the UE.

Specifically, the attach accept message includes a link local address interface identifier allocated by the PDN-GW received by the MME for the UE.

105: The UE generates a link local address.

Specifically, after receiving the link local address interface identifier allocated by the PDN-GW, the UE generates a link local address of the UE according to the link local address interface identifier, and the link local address interface identifier and the PDN allocated by the PDN-GW. - The GW's own link local address interface identifier is different and the UE generates a link local address according to the link local address interface identifier allocated by the PDN-GW, and can ensure the link local address generated by the UE and the link local address of the PDN-GW. different.

Optionally, the UE sends a Router Solicitation (RS) message to the PDN-GW.

Specifically, the UE may send a route request message to the PDN-GW to request the PDN-GW to send a route advertisement message if the UE does not receive the Router Advertisement (RA) message sent by the PDN-GW. 107: The PDN-GW sends a route advertisement message to the UE.

Specifically, the route advertisement message sent by the PDN-GW to the UE includes an IPv6 prefix, and the IPv6 prefix is globally unique. The IPv6 prefix may be managed by the PDN-GW or may be externally obtained by the PDN-GW, for example: DHCP (Dynamic Host Configuration Protocol) or AAA (Authentication, Authorization and Accounting) server.

108: The UE generates an IPv6 global address.

Specifically, after receiving the route advertisement message, the UE obtains the IPv6 prefix, and generates an IPv6 global address for the data transmission according to the IPv6 prefix. The IPv6 global address is composed of the IPv6 prefix and the interface identifier. The link local address identifier of the user equipment may be used, or may be generated by the user equipment.

109: The UE starts data transmission.

It can be seen that, in the foregoing process, the P匪-GW allocates a link local address interface identifier different from its own link local address interface identifier to the UE, so that the link local address generated by the UE and the link part of the P匪-GW are locally Different addresses prevent IPv6 address conflicts.

With the development of mobile networks and the diversity of IPv6 terminal development, many UEs do not use the link local address interface identifier assigned by P匪-GW to generate link local addresses, but use their own algorithms to generate links. The local address interface identifies and further generates a link local address, and the UE sends an NS (Ne ghbor System) message to the PDN-GW for address repetition detection. In the IPv6 address allocation scheme of the 3GPP network, since the link local address interface identifier is allocated by the P匪-GW, the link local address generated by the UE according to the link local address interface identifier allocated by the PDN-GW is bound to the chain of the PDN-GW. The local address of the path is different, so that the problem of IPv6 address conflict does not occur. Therefore, the P匪-GW discards the neighbor request message sent by the UE for address duplicate detection.

A GGSN will discard all neighbor request messages sent by the user equipment in the case that the data gateway is a GGSN (Gateway GPRS Support Node). In the above case, on the one hand, the link local address generated by the UE using the link local address interface identifier generated by the algorithm may be the same as the link local address of the P匪-GW; on the other hand, the PDN-GW may be lost. The neighbor request message sent by the UE for address duplicate detection is discarded (the GGSN discards all neighbor request messages sent by the user equipment); finally, in the IPv6 address allocation process, the link between the UE and the P匪-GW is partially caused. The addresses are the same, causing an IPv6 address conflict.

This problem will be more common especially when the UE is a separate device. For example, when a 3G network card is inserted into a notebook for service, the notebook cannot obtain the link local address interface identifier assigned by the P匪-GW, but generates a link local address interface identifier by its own algorithm.

In order to solve the above problem, as shown in FIG. 2, an embodiment of the present invention provides a method for processing an address, including:

201: The data gateway acquires an address processing capability of the user equipment.

202: When the user equipment does not have the processing capability of 3GPP IPv6, the data gateway performs an address conflict detection processing procedure.

Specifically, in the 3GPP network, there is a case where the user equipment does not perform IPv6 address allocation according to the IPv6 address allocation process of the 3GPP network, so the data gateway needs to perform corresponding processing according to the address processing capability of the user equipment. When it is determined that the user equipment has the IPv6 processing capability of the 3GPP, the IPv6 address allocation may be performed according to the IPv6 address allocation process of the 3GPP network shown in FIG. 1; when it is determined that the user equipment does not have the IPv6 processing capability of the 3GPP, the data gateway is An address conflict detection process is required to resolve the possible address conflicts.

Specifically, the data gateway may be a network element having an IPv6 address allocation function, for example, a Packet Data Network (PDN-GW), a Gateway GPRS Supper Node (Galecommunications GPRS Support Node, GGSN for short), Local mobile anchor (Loca l Mobi 1 ty Anchor, LMA for short) or Mobi le Acces s Ga teway (MAG).

It is known to those skilled in the art that, as the network architecture evolves and the device is upgraded, the network element having the IPv6 address allocation function may be extended in the 3GPP network, which is not limited in the embodiment of the present invention. Specifically, the address processing capability of the user equipment refers to a technical solution adopted by the user equipment to process an address. The user equipment has the IPv6 processing capability of the 3GPP, which means that the user equipment is configured to perform IPv6 address processing using the IPv6 address allocation scheme of the 3GPP network; the user equipment does not have the IPv6 processing capability of the 3GPP, and the user equipment does not adopt the 3GPP. A technical solution for IPv6 address allocation of the network to perform IPv6 address processing.

It is assumed that the user equipment has the IPv6 processing function of 3GPP, but in the actual IPv6 address allocation process, the user equipment does not adopt the IPv6 address allocation technical solution of the 3GPP network to perform IPv6 address processing, and does not obtain the IPv6 address using the 3GPP network. The result of the assigned technical solution for IPv6 address processing is also considered to be that the user equipment does not have the IPv6 processing capability of 3GPP.

It can be seen that determining whether the user equipment has the IPv6 processing capability of the 3GPP is not determining whether the user equipment has the IPv6 processing function of the 3GPP, but determining whether the user equipment can generate a correct result in the IPv6 address allocation process (the correct result is The technical solution of IPv6 address allocation in the 3GPP network is used to perform the IPv6 address processing, and the correct result should be obtained. It is determined whether the user equipment adopts the technical solution of IPv6 address allocation of the 3GPP network, that is, whether the user equipment has 3GPP. The ability to handle IPv6.

In particular, when the user equipment does not adopt the technical solution of IPv6 address allocation of the 3GPP network to perform IPv6 address processing, but obtains the result that should be obtained by using the technical scheme of IPv6 address allocation of the 3GPP network to perform IPv6 address processing, It is considered that the user equipment adopts the technical solution of IPv6 address allocation of the 3GPP network to perform IPv6 address processing, that is, the user equipment has the processing capability of 3GPP IPv6.

In summary, when the user equipment obtains the technical solution of the IPv6 address allocation using the 3GPP network in the IPv6 address allocation process, the user equipment is considered to have the IPv6 processing capability of the 3GPP; when the user equipment is in the IPv6 address allocation process If the technical solution of IPv6 address allocation using the 3GPP network is not obtained, the user equipment is considered to have no IPv6 processing capability of 3GPP. Specifically, in the process of performing IPv6 address allocation, the user equipment adopts the technical solution of IPv6 address allocation of the 3GPP network to perform IPv6 address processing and the technical solution of not using the IPv6 address allocation of the 3GPP network to perform IPv6 address processing, and the difference is that the user When generating the link local address, the device generates a link local address according to the link local address interface identifier allocated by the data gateway. When the link local address is generated according to the link local address interface identifier assigned by the data gateway, the link local address interface identifier of the link local address generated by the user equipment should be the same as the link local address interface identifier allocated by the data gateway. That is, when the user equipment adopts the technical solution of IPv6 address allocation of the 3GPP network in the IPv6 address allocation process, the link local address interface identifier of the link local address generated by the link and the link local address interface identifier of the data gateway are allocated. The same is true; when the user equipment does not adopt the technical solution of IPv6 address allocation of the 3GPP network in the IPv6 address allocation process, the link local address interface identifier of the link local address generated by the user equipment is different from the link local address interface identifier allocated by the data gateway. .

Therefore, whether the user equipment has the IPv6 processing capability of the 3GPP can be determined according to whether the link local address interface identifier of the link local address generated by the user equipment is the same as the link local address interface identifier allocated by the data gateway. If the link local address interface identifier of the link local address generated by the user is the same as the link local address interface identifier assigned by the data gateway, the user equipment is considered to adopt the IPv6 address allocation technical solution of the 3GPP network to perform IPv6 address processing, that is, The user equipment has the IPv6 processing capability of the 3GPP network; if the link local address interface identifier of the link local address generated by the user is different from the link local address interface identifier allocated by the data gateway, the user equipment is considered not to adopt the IPv6 address allocation of the 3GPP network. The technical solution is to perform IPv6 address processing, that is, the user equipment does not have the processing capability of 3GPP IPv6.

In a specific implementation, when the user equipment is attached to the network, the data gateway sends the link local address interface identifier allocated by the data gateway to the user equipment by using the mobility management network element, in the message sent by the user equipment (the user equipment) Then, the part-local address generated by the user equipment is implicitly transmitted, and the link local address interface identifier is included in the local address of the link. Therefore, the data gateway acquires the address processing capability of the user equipment, and the implementation can The data processing gateway sends the link local address interface identifier of the data gateway to the user equipment, and receives the link local address interface identifier of the user equipment sent by the user equipment, so as to obtain the address processing capability of the user equipment. The data gateway can know whether the user equipment has the identity by using the local address interface identifier of the link and the assigned link local address interface identifier sent by the data gateway to the user equipment.

3GPP's IPv6 processing capabilities.

The local address interface identifier of the link allocated by the data gateway to the user equipment may be saved on the data gateway, and the link local address interface identifier of the received user equipment may be transmitted after the allocated local address interface identifier of the link is sent. Compare.

When it is determined that the user equipment does not have the IPv6 processing capability of the 3GPP, the IPv6 address conflict may occur, which means that the allocated link local address of the user equipment is consistent with the link local address of the data gateway accessed by the user equipment. . In order to avoid the above problem, the data gateway needs to perform corresponding processing. In the example of the present invention, the data gateway needs to perform an address conflict detection processing procedure when the user equipment does not have the 3GPP IPv6 processing capability.

Specifically, the address conflict detection processing procedure includes address conflict detection and address conflict processing. The address conflict detection is to detect whether an address duplication has occurred. The address conflict processing is to deal with the situation where the address is duplicated, that is, to solve the address conflict problem.

When the address is detected to be duplicated, it is detected whether the link local address of the data gateway and the link local address of the user equipment are the same. Since the link local address interface identifier assigned by the data gateway is different from the link local address interface identifier of the data gateway itself, the link local address of the user equipment including the link local address interface identifier allocated by the data gateway must be linked to the data gateway chain. The local address of the link is different, and when the link local address of the user equipment does not include the link local address interface identifier allocated by the data gateway, the link local address of the user equipment may be the same as the link local address of the data gateway, that is, the user When the device does not have the IPv6 processing capability of 3GPP, the link local address of the user equipment may be the same as the link local address of the data gateway.

When the link local address of the user equipment is the same as the link local address of the data gateway, it indicates that the IPv6 address of the user equipment conflicts with the IPv6 address of the data gateway, and address duplication occurs. If the link local address of the user equipment is different from the link local address of the data gateway, it means that the IPv6 address of the user equipment does not conflict with the IPv6 address of the data gateway, that is, no address duplication occurs.

The link local address of the user equipment is implicit in the message that the user equipment subsequently sends (the user equipment then sends a neighbor request message and a route request message, etc.).

When the link local address of the user equipment is different from the link local address of the data gateway, that is, no duplicate address occurs, the data gateway does not perform subsequent address conflict processing.

When the link local address of the user equipment is the same as the link local address of the data gateway, that is, when the address is duplicated, the data gateway performs address conflict processing. After the address conflict processing, the link local address of the data gateway and the link local address of the user equipment are the same, that is, the above IPv6 address conflict is solved.

In summary, the method provided by the embodiment of the present invention acquires the address processing capability of the user equipment by using the data gateway, and further performs an address conflict detection processing procedure on the user equipment that does not have the IPv6 processing capability of the 3GPP, and overcomes the non-3GPP standard user equipment. The problem of IPv6 address conflict caused by accessing the 3GPP network ensures the normal operation of the 3GPP network.

Further, the address conflict processing may be divided into two processing modes: 1) causing the user equipment to regenerate a link local address different from the data gateway; 2) causing the network side to attach the user equipment. Under what conditions, the method of address conflict processing can be set by the operator according to the specific network conditions and policies:

1) causing the user equipment to regenerate the link local address different from the data gateway

By causing the user equipment to regenerate the link local address different from the data gateway, the link local address of the user equipment is different from the link local address of the data gateway, which solves the above problem of IPv6 address conflict.

Specifically, in order to enable the user equipment to re-allocate the link local address different from the data gateway, the data gateway may send the first indication information to the user equipment, instructing the user equipment to regenerate the link local address. Regenerating the link local address means regenerating a different local address from the original link. The link local address, therefore, the regenerated link local address must be different from the link local address of the data gateway, that is, there will be no conflict with the data gateway IPv6 address.

Specifically, after the user equipment sends the neighbor request message to the data gateway, the data gateway may send a neighbor advertisement message to the user equipment, indicating that a link local address conflict occurs, and the user equipment needs to regenerate a link local address (can be understood as a neighbor). The announcement message is the first indication information, indicating that the user equipment regenerates a link local address, or the first indication information displayed in the neighbor advertisement message, indicating that the user equipment regenerates the link local address. The data gateway may also ignore the user equipment sending a neighbor request message. After receiving the route request message sent by the user equipment, the data gateway may include the first indication information in the route advertisement message, indicating that the user equipment regenerates the link local address. Similarly, the data gateway may not separately include the first indication information in other messages, but independently send the first indication information to instruct the user equipment to regenerate the link local address.

After the first indication information is sent, if the user equipment sends the neighbor request message again to perform the duplicate address detection request, the data gateway may not process the duplicate address detection request. Of course, the data gateway can also process the duplicate address detection request sent by the user equipment again.

Further, after transmitting the first indication information, the data gateway instructs the user equipment to regenerate the link local address, and sends an IPv6 prefix to the user equipment, so that the user equipment generates an IPv6 global address.

Before the data gateway sends the first indication information, the user equipment may also send a routing request message, requesting the data gateway to send an IPv6 prefix to the user equipment.

The following is a description of the specific scenario. In this scenario, the P匪-GW is used as the data gateway, the MME is used as the mobility management network element, and the UE is the user equipment conforming to the IETF (Internet Engingering Task Force) standard. The UE generates a link local address interface identifier according to its own setting, for example, according to a MAC (Media Acces s Cont rol, media access control) address, as shown in FIG. 3:

301: The UE sends an attach request message to the MME.

Specifically, after the UE is powered on, an attach request is initiated, and the address type is included in the attach request message. The address type is IPv6 PDN Type and is sent to the MME. The I Pv6 PDN Type indicates that the PDN connection type is IPv6.

302: 丽 E sends a create session request message to the PDN-GW;

Specifically, the MME initiates a session creation request to the S-GW, and reaches the P匪-GW through the S-GW. The Create Session Request message includes the IPv6 P匪 Type received by the UE from the UE.

303: The PDN-GW allocates a first link local address interface identifier to the UE and saves the identifier;

Specifically, the link local address interface identifier is used to generate a link local address, and the first link local address interface identifier allocated by the PDN-GW for the UE is different from the link local address interface identifier of the PDN-GW itself to ensure The link local address generated by the user equipment is different from the link local address of the P匪-GW. After the PDN-GW allocates the first link local address to the UE, the first link local address is saved on the PDN-GW.

304: The PDN-GW sends a create session response message to the MME;

Specifically, the P匪-GW sends a create session response message to the S-GW, and reaches the 匪E through the S-GW; wherein, the packet data network address (P匪Addr ess) in the create session response message includes the PDN-GW allocation. The first link local address interface identifier.

305: The MME sends an attach accept message to the UE.

Specifically, the attach accept message includes a first link local address interface identifier allocated by the P-GW received by the MN to the UE.

306: The UE generates a second link local address interface identifier according to the MAC address and generates a link local address.

Specifically, after receiving the link local address interface identifier allocated by the PDN-GW, the UE does not generate a link local address of the UE according to the link local address interface identifier, but generates a second link local address according to the MAC address. The interface identifier further generates a link local address of the UE according to the second link local address interface identifier.

307: The UE sends a neighbor request message to the P匪-GW.

Specifically, the UE sends the local address of the link generated by the identifier according to the second link local address interface identifier. The neighbor request message is sent to the PDN-GW, and the neighbor request message is used to request the P-GW to perform duplicate address detection.

308: The PDN-GW determines whether the first link local address interface identifier is the same as the second link local address interface identifier.

Specifically, after receiving the duplicate address detection request sent by the UE, the P匪-GW obtains the second link local address interface identifier of the UE from the neighbor request message, and the first link local address saved on the P匪-GW. The interface identifiers are compared, and the first link local address interface identifier is different from the second link local address interface identifier, indicating that the link local address of the UE may be the same as the link local address of the P匪-GW.

309: P匪-GW determines whether the link local address of the P匪-GW is the same as the link local address of the UE;

Specifically, after receiving the duplicate address detection request sent by the UE, the P匪-GW also obtains the link local address of the UE from the neighbor request message. When the first link local address interface identifier is different from the second link local address interface identifier, the PDN-GW determines whether the link local address of the PDN-GW is the same as the link local address of the UE, and obtains a chain of the PDN-GW. The local address of the road is the same as the local address of the link of the UE, indicating that the link local address of the P匪-GW conflicts with the link local address of the UE.

31 0 : P匪 -GW sends the announcement message to the UE;

Specifically, the domain advertisement message sent by the P-GW includes first indication information, where the first indication information indicates that the UE re-generates the link local address; and the re-generated link local address interface identifier must be related to the second link. The local address interface identifier is different. Therefore, the UE re-generates the link local address according to the regenerated link local address interface identifier and the link local address generated by the UE according to the second link local address interface identifier, and therefore, the UE regenerates. The link local address must be different from the link local address of the P匪-GW, that is, the link local address of the UE does not conflict with the link local address of the PDN-GW, that is, the UE and the PDN-GW are resolved. The problem of IPv6 address conflicts.

31 1 : The UE regenerates the third link local address interface identifier and generates a link local address. Specifically, after receiving the information sent by the P匪-GW, the UE regenerates the link local address information. The UE re-generates the link local address interface identifier, which is referred to as the third link local address interface identifier.

312: The UE sends a neighbor request to the P匪-GW.

Specifically, after the UE re-generates the link local address, the P-GW is again requested to perform the repeated address detection, so the UE sends the neighbor request message to the P-GW again to request the P-GW to perform the duplicate address detection. The link local address regenerated by the UE must be different from the link local address of the P匪-GW. After receiving the duplicate address detection sent by the UE, the P匪-GW may not process it.

Optionally, 31 3: the UE sends a route request message to the PDN-GW;

Specifically, if the UE does not receive the route advertisement message sent by the PDN-GW within a certain period of time, the UE may actively send a route request message to the PDN-GW to request the PDN-GW to send a route advertisement message.

314: The PDN-GW sends a route advertisement message to the UE.

Specifically, the route advertisement message sent by the P-GW to the UE includes an IPv6 prefix, where the IPv6 prefix is globally unique; wherein the IPv6 prefix can be managed by the P匪-GW, or can be obtained externally by the P匪-GW. For example: DHCP server or AAA server.

315: The UE generates an IPv6 global address.

Specifically, after receiving the route advertisement message, the UE obtains the IPv6 prefix and generates an IPv6 global address for the data transmission according to the IPv6 prefix. The IPv6 global address is composed of the IPv6 prefix and the interface identifier. The link local address identifier of the user equipment may be used, or may be generated by the user equipment.

316: The UE starts data transmission.

It can be seen that, in the foregoing scenario, the first link local address identifier allocated by the P匪-GW and the second link local address identifier of the UE are compared by the data gateway PDG-GW, and a link local address identifier and the second link are compared. In the case where the local address identifiers are different, the link local address of the UE and the link local address of the PDN-GW are compared, and when the link local address of the UE and the link local address of the P匪-GW are in the neighbor advertisement message The first indication information is included, and the UE is instructed to regenerate the link local address, which overcomes the problem of IPv6 address conflict caused by the non-3GPP standard user equipment accessing the 3GPP network. It is a barrier to the normal operation of the 3GPP network.

In the embodiment of the present invention, the PDN-GW may perform address conflict detection processing after receiving the routing request message sent by the user equipment.

The method in the embodiment of the present invention can be equally applied to a scenario in which the mobility management network element is an SGSN and the data gateway is a GGSN.

2) Let the network side attach the user equipment

By attaching the user equipment, the IPv6 global address of the data gateway can be unique in the network, and the above IPv6 address conflict problem is also solved.

Specifically, the data gateway may send an indication message to the mobility management network element, and instruct the mobility management network element to attach the user equipment, and after receiving the indication message, the mobility management network element initiates a detach process.

The following is a description of the specific scenario. In this scenario, the P匪-GW is used as the data gateway, the MME is used as the mobility management network element, and the UE is the user equipment that conforms to the IETF standard. The UE uses its own settings, for example, according to the MAC address. Generate the link local address interface identifier, as shown in Figure 4:

401: The UE sends an attach request message to the MME.

Specifically, after the UE is powered on, the UE initiates an attach request, and the address request type is included in the attach request message, and the address type is an IPv6 PDN Type, and is sent to the MME. The IPv6 PDN Type indicates that the PDN connection type is IPv6.

402: 丽 E sends a create session request message to the PDN-GW;

Specifically, the P匪-GW initiates a session creation request to the S-GW, and reaches the P匪-GW through the S-GW. The Create Session Request message includes the IPv6 PDN Type received by the UE from the UE.

403: The PDN-GW allocates the first link local address interface identifier to the UE and saves the identifier.

Specifically, the link local address interface identifier is used to generate a link local address, and the first link local address interface identifier allocated by the PDN-GW for the UE is different from the link local address interface identifier of the PDN-GW itself to ensure The link local address generated by the user equipment is different from the link local address of the P匪-GW. After the PDN-GW allocates the first link local address to the UE, the first link office is saved on the PDN-GW. Department address.

404: P匪 _GW sends a create session response message to the MME;

405: The MME sends an attach accept message to the UE.

406: The UE generates a second link local address interface identifier according to the MAC address and generates a link local address.

Specifically, after receiving the link local address interface identifier allocated by the P匪-GW, the UE does not generate a link local address of the UE according to the link local address interface identifier, but generates a second link part according to the MAC address. The address interface identifier further generates a link local address of the UE according to the second link local address interface identifier.

407: The UE sends a neighbor request message to the P_GW.

Specifically, the UE sends a neighbor request message to the PDN-GW according to the link local address generated by the second link local address interface identifier, where the neighbor request message is used to request the P匪-GW to perform duplicate address detection; The neighbor request message sent by the UE is not processed.

408: The UE sends a route request message to the GGSN.

Specifically, the UE waits to receive the neighbor advertisement message sent by the P匪-GW, but the UE cannot receive the neighbor advertisement sent by the P匪-GW because the P匪-GW does not process the neighbor request message for the address repeat detection sent by the UE. The message, after the waiting time expires, the UE sends a neighbor request message to the PDN-GW according to the link local address generated by the second link local address interface identifier to request an IPv6 prefix for generating the IPv6 global address.

409: The PDN-GW determines whether the first link local address interface identifier is the same as the second link local address interface identifier. Specifically, after receiving the duplicate address detection request sent by the UE, the P匪-GW obtains the second link local address interface identifier of the UE from the neighbor request message, and the first link local address saved on the P匪-GW. The interface identifiers are compared, and the first link local address interface identifier is different from the second link local address interface identifier, indicating that the link local address of the UE may be the same as the link local address of the P匪-GW.

41 0 : P匪 _GW determines whether the link local address of the PDN-GW is the same as the link local address of the UE;

Specifically, after receiving the duplicate address detection request sent by the UE, the P匪-GW also obtains the link local address of the UE from the neighbor request message. When the first link local address interface identifier is different from the second link local address interface identifier, the PDN-GW determines whether the link local address of the P匪-GW is the same as the link local address of the UE, and obtains the PDN-GW. The link local address is the same as the link local address of the UE, indicating that the link local address of the P匪-GW conflicts with the link local address of the UE.

41 1 : P匪-GW sends the second indication information to the MME;

Specifically, the P-GW sends the second indication information to the MME, and indicates that the MME de-attaches the UE. Since the UE with the same link local address is detached, there is no local address of the link where the P匪-GW conflicts. That is, the problem that the UE and the PDN-GW have an IPv6 address conflict is solved.

412: The network side detaches the UE.

It can be seen that, in the foregoing scenario, the first link local address identifier allocated by the P匪-GW and the second link local address identifier of the UE are compared by the data gateway PDN-GW, and a link local address identifier and the second link are When the local address identifiers are different, the link local address of the UE and the link local address of the PDN-GW are compared, and when the link local address of the UE and the link local address of the P匪-GW are sent, the second indication is sent. The information to the MME indicates that the network is detached from the UE, which overcomes the problem of IPv6 address conflict caused by the non-3GPP standard user equipment accessing the 3GPP network, and ensures the normal operation of the 3GPP network.

In the embodiment of the present invention, after receiving the neighbor request sent by the user equipment, the GGSN may start the address conflict detection process. The method in the embodiment of the present invention can be equally applied to a scenario in which the mobility management network element is an SGSN and the data gateway is a GGSN.

The ideas of embodiments of the invention are equally applicable to devices and systems. and so,

As shown in FIG. 5, an embodiment of the present invention further provides a data gateway 500, including: an obtaining module 501, configured to acquire an address processing capability of a user equipment;

The processing module 502 is configured to perform an address conflict detection processing procedure when the user equipment does not have the processing capability of the IPv6 of the 3GPP.

Further, the processing module 502 is specifically configured to: when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is the same as the link local address of the data gateway, perform an address conflict processing procedure;

Further, the processing module 502 is specifically configured to: when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is the same as the link local address of the data gateway, send the first indication information to the user equipment. The first indication information is used to indicate that the user equipment regenerates the link local address; or, specifically, when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment and the data gateway chain The second local information is sent to the mobility management network element, where the second indication information is used to instruct the mobility management network element to attach the user equipment.

The obtaining module 501 includes: a first sending module 501a, configured to send a first link local address interface identifier to the user equipment; and a first receiving module 501b, after sending the first link local address interface identifier to the user equipment, Receiving a second link local address interface identifier sent by the user equipment; correspondingly, the processing module 502 is configured to: perform address conflict detection when the first link local address interface identifier is different from the second link local address interface identifier Processing flow

Further, the processing module 502 is specifically configured to: when the first link local address interface identifier is different from the second link local address interface identifier, if the link local address of the user equipment is the same as the link local address of the data gateway, Perform an address conflict processing process;

Further, the processing module 502 is specifically configured to: when the first link local address interface identifier and the first link When the two-link local address interface identifier is different, if the link local address of the user equipment is the same as the link local address of the data gateway, the first indication information is sent to the user equipment, and the first indication information is used to indicate that the user equipment re-generates the chain. The local address of the path; or, specifically, when the first link local address interface identifier is different from the second link local address interface identifier, if the link local address of the user equipment is the same as the link local address of the data gateway, sending The second indication information is sent to the mobility management network element, where the second indication information is used to indicate that the mobility management network element is attached to the user equipment;

The first receiving module 501b is specifically configured to: receive an NS message sent by the user equipment, where the NS message includes a second link local address interface identifier; or, specifically, receive an RS message sent by the user equipment, where the RS message is received. Contains a second link local address interface identifier.

Further, the data gateway 500 further includes: a saving module 504, configured to save the first link local address interface identifier.

The data gateway in the embodiment of the present invention may be a packet data network gateway, a gateway GPRS support node, a local mobility anchor or a mobile access gateway.

The data gateway provided by the embodiment of the present invention, by acquiring the address processing capability of the user equipment, performs an address conflict detection processing procedure on the user equipment that does not have the IPv6 processing capability of the 3GPP, and overcomes the non-3GPP standard user equipment accessing the 3GPP network. The problem of IPv6 address conflicts is guaranteed to ensure the normal operation of the 3GPP network.

As shown in FIG. 8, the embodiment of the present invention further provides a system for processing an address, including: a user equipment 601, configured to send an address processing capability;

The data gateway 602 is configured to obtain the address processing capability of the user equipment 601. When the user equipment 601 does not have the processing capability of the 3GPP IPv6, the address conflict detection processing procedure is performed.

Further, the data gateway 602 is specifically configured to acquire the address processing capability of the user equipment 601. When the user equipment 601 does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment 601 and the link of the data gateway 602 The local address is the same, and the address conflict processing flow is performed.

At this time, correspondingly, the user equipment 601 is configured to send an address processing capability.

Further, the data gateway 602 is specifically configured to obtain the address processing capability of the user equipment 601. When the user equipment 601 does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment 601 is the same as the link local address of the data gateway 602, the first indication information is sent, and the first indication information is used to indicate Regenerate the link local address.

At this time, correspondingly, the user equipment 601 is specifically configured to: send an address processing capability; receive the first indication information, and regenerate a link local address.

Further, the data gateway 602 is specifically configured to: send a first link local address interface identifier; receive a second link local address interface identifier sent by the user equipment 601; and use the first link local address interface identifier and the second link When the local address interface identifiers are different, the address conflict detection processing procedure is performed.

At this time, correspondingly, the user equipment 601 is specifically configured to: receive the first link local address interface identifier sent by the data gateway 602; and send the second link local address interface identifier.

The data gateway 602 is further configured to save the first link local address interface identifier.

Further, the data gateway 602 is specifically configured to: send a first link local address interface identifier; receive a second link local address interface identifier sent by the user equipment 601; and use the first link local address interface identifier and the second link When the local address interface identifiers are different, if the link local address of the user equipment 601 is the same as the link local address of the data gateway 602, an address conflict processing procedure is performed.

Further, the data gateway 602 is specifically configured to: send a first link local address interface identifier; receive a second link local address interface identifier sent by the user equipment 601; and use the first link local address interface identifier and the second link When the local address interface identifier is different, if the link local address of the user equipment 601 is the same as the link local address of the data gateway 602, the first indication information is sent, and the first indication information is used to indicate that the link local address is regenerated.

At this time, correspondingly, the user equipment 601 is specifically configured to receive the first link local address interface identifier sent by the data gateway 602, send the second link local address interface identifier, receive the first indication information, and regenerate the link local part. address. The data gateway 602 is further configured to save the first link local address interface identifier.

Further, the data gateway 602 is specifically configured to: send the first link local address interface identifier; receive the NS message sent by the user equipment 601, where the NS message includes the second link local address interface identifier, or the receiving user equipment 601 sends The RS message includes the second link local address interface identifier. When the first link local address interface identifier is different from the second link local address interface identifier, the address conflict detection processing procedure is performed.

At this time, correspondingly, the user equipment 601 is specifically configured to receive the first link local address interface identifier sent by the data gateway 602; and send the NS message or the RS message.

Further, the data gateway 602 is specifically configured to: send the first link local address interface identifier; receive the NS message sent by the user equipment 601, where the NS message includes the second link local address interface identifier, or the receiving user equipment 601 sends RS message, the RS message includes a second link local address interface identifier; when the first link local address interface identifier is different from the second link local address interface identifier, if the user equipment 601 links the local address and the data gateway The link local address of 602 is the same, and an address conflict processing process is performed.

Further, the data gateway 602 is specifically configured to: send the first link local address interface identifier; receive the NS message sent by the user equipment 601, where the NS message includes the second link local address interface identifier, or the receiving user equipment 601 sends RS message, the RS message includes a second link local address interface identifier; when the first link local address interface identifier is different from the second link local address interface identifier, if the user equipment 601 links the local address and the data gateway The link local address of the 602 is the same, and the first indication information is sent, where the first indication information is used to indicate that the link local address is regenerated.

At this time, correspondingly, the user equipment 601 is specifically configured to: receive the first link local address interface identifier sent by the data gateway 602; send the NS message or the RS message; receive the first indication Information, regenerate the link local address.

As shown in FIG. 9, the system further provided by the embodiment of the present invention further includes: a mobility management network element 603; at this time, the data gateway 602 is specifically configured to acquire an address processing capability of the user equipment 601; when the user equipment 601 does not have 3GPP IPv6 processing capability, if the link local address of the user equipment 601 is the same as the link local address of the data gateway 602, the second indication information is sent, the second indication information is used to indicate that the user equipment 601 is detached;

The mobility management network element 603 is configured to receive the second indication information, and detach the user equipment 601. The user equipment 601 is specifically configured to send an address processing capability.

Further, the data gateway 602 is specifically configured to: send a first link local address interface identifier; receive a second link local address interface identifier sent by the user equipment 601; and use the first link local address interface identifier and the second link When the local address interface identifier is different, if the link local address of the user equipment 601 is the same as the link local address of the data gateway 602, the second indication information is sent, and the second indication information is used to indicate that the user equipment 601 is detached.

Further, the data gateway 602 is specifically configured to: send the first link local address interface identifier; receive the NS message sent by the user equipment 601, where the NS message includes the second link local address interface identifier, or the receiving user equipment 601 sends RS message, the RS message includes a second link local address interface identifier; when the first link local address interface identifier is different from the second link local address interface identifier, if the user equipment 601 links the local address and the data gateway The link local address of the 602 is the same, and the second indication information is sent, where the second indication information is used to indicate that the user equipment 601 is detached.

At this time, correspondingly, the user equipment 601 receives the first link local address interface identifier sent by the data gateway 602; and sends the NS message or the RS message.

The data gateway 602 is further configured to save the first link local address interface identifier. The data gateway 602 may be a packet data network gateway, a gateway GPRS support node, a local mobility anchor, or a mobile access gateway.

The system provided by the embodiment of the present invention obtains the address processing capability of the user equipment through the data gateway, and performs an address conflict detection processing procedure on the user equipment that does not have the IPv6 processing capability of the 3GPP, and overcomes the non-3GPP standard user equipment access to the 3GPP. The problem of IPv6 address conflict caused by the network ensures the normal operation of the 3GPP network.

It will be understood by those of ordinary skill in the art that the drawings are only a schematic representation of one embodiment, and the modules or processes in the drawings are not necessarily required to practice the invention.

Those skilled in the art can understand that the modules in the data gateway in the embodiment can be distributed in the data gateway of the embodiment according to the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are replaced by equivalents; and the modifications or substitutions do not deviate from the spirit of the technical solutions of the embodiments of the present invention. range.

Claims

A method for processing an address, comprising:

When the user equipment does not have the processing capability of the sixth edition Internet Protocol IPv6 of the 3rd Generation Partnership Project 3GPP, the data gateway performs an address conflict detection processing flow.

2. The method according to claim 1, wherein the data gateway performs an address conflict detection processing process, including:

When the link local address of the user equipment is the same as the link local address of the data gateway, the data gateway performs an address conflict processing procedure.

The method of claim 2, wherein the data gateway performs an address conflict processing process, including:

The data gateway sends the first indication information to the user equipment, where the first indication information is used to instruct the user equipment to regenerate a link local address.

4. The method of claim 3, wherein the method further comprises:

After the data gateway sends the first indication information to the user equipment, if the duplicate address detection request sent by the user equipment is received, the data gateway does not process the duplicate address detection request.

The method according to claim 3 or 4, wherein the method further comprises:

The data gateway sends IPv6 prefix information to the user equipment.

The data gateway sends the second indication information to the mobility management network element, where the second indication information is used to instruct the mobility management network element to attach the user equipment.

7. The method of any of claims 1-6, wherein

The data gateway acquires address processing capabilities of the user equipment, including:

Transmitting, by the data gateway, a first link local address interface identifier to the user equipment;

The data gateway receives the second link local address interface identifier sent by the user equipment; the user equipment does not have the IPv6 processing capability of the 3GPP, and includes: The first link local address interface identifier is different from the second link local address interface identifier.

The method of claim 7, wherein the data gateway receives the second link local address interface identifier sent by the user equipment, including:

The data gateway receives the neighbor request NS message sent by the user equipment, where the NS message includes the second link local address interface identifier; or

The data gateway receives a route request RS message sent by the user equipment, where the RS message includes the second link local address interface identifier.

The method according to claim 7 or 8, wherein the method further comprises: the data gateway saving the first link local address interface identifier.

10. A data gateway, comprising:

And a processing module, configured to perform an address conflict detection processing process when the user equipment does not have the processing capability of IPv6 of 3GPP.

11. The data gateway of claim 10, wherein:

The processing module is specifically configured to: when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is the same as the link local address of the data gateway, performing address conflict processing Process.

12. The data gateway of claim 11 wherein:

The processing module is specifically configured to: when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is the same as the link local address of the data gateway, send the first indication The information is sent to the user equipment, and the first indication information is used to instruct the user equipment to regenerate a link local address.

13. The data gateway of claim 11 wherein:

The processing module is specifically configured to: when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is the same as the link local address of the data gateway, send a second indication The information is sent to the mobility management network element, where the second indication information is used to instruct the mobility management network element to attach the user equipment.

14. The data gateway of claim 10, wherein:

The acquiring module includes: a first sending module, configured to send a first link local address interface identifier to the user equipment; and a first receiving module, after sending the first link local address interface identifier to the user equipment Receiving, by the user equipment, a second link local address interface identifier;

The processing module is specifically configured to: when the first link local address interface identifier is different from the second link local address interface identifier, perform an address conflict detection processing procedure.

The data gateway according to claim 14, wherein the first receiving module is configured to: receive an NS message sent by the user equipment, where the NS message includes the second link local address And receiving an RS message sent by the user equipment, where the RS message includes the second link local address interface identifier.

The data gateway according to claim 14 or 15, wherein the data gateway further comprises:

And a saving module, configured to save the first link local address interface identifier.

17. A system for processing an address, comprising:

User equipment, used to send address processing capabilities;

The data gateway is configured to obtain an address processing capability of the user equipment, and when the user equipment does not have the processing capability of the IPv6 of the 3GPP, perform an address conflict detection processing procedure.

18. The system of claim 17 wherein:

The data gateway is specifically configured to: obtain an address processing capability of the user equipment; when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is related to the data gateway The link local addresses are the same, and the address conflict processing process is performed.

19. The system of claim 18, wherein:

The data gateway is specifically configured to: obtain an address processing capability of the user equipment; when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is related to the data gateway The link local address is the same, and the first indication information is sent, where the first indication information is used to indicate that the link local address is regenerated;

The user equipment is further configured to receive the first indication information, and regenerate a link local address.

20. The system of claim 18, wherein the system further comprises a mobility management network element;

The data gateway is specifically configured to: obtain an address processing capability of the user equipment; when the user equipment does not have the IPv6 processing capability of the 3GPP, if the link local address of the user equipment is related to the data gateway The link local address is the same, and the second indication information is sent, where the second indication information is used to indicate that the user equipment is detached;

The mobility management network element is configured to receive the second indication information and attach the user equipment.

21. The system of claim 17 wherein:

The data gateway is specifically configured to: send a first link local address interface identifier; receive a second link local address interface identifier sent by the user equipment; and when the first link local address interface identifier and the second link When the local address interface identifiers of the roads are different, an address conflict detection processing procedure is performed;

The user equipment is specifically configured to: receive a first link local address interface identifier sent by the data gateway; and send the second link local address interface identifier.

22. The system of claim 21, wherein:

The data gateway is specifically configured to: send a first link local address interface identifier; receive an NS message sent by the user equipment, where the NS message includes the second link local address interface identifier, or receive the An RS message sent by the user equipment, where the RS message includes the second link local address interface identifier; when the first link local address interface identifier is different from the second link local address interface identifier, performing address conflict detection Processing flow

The user equipment is specifically configured to: receive a first link local address interface identifier sent by the data gateway; and send the NS message or the RS message.

23. The system of claim 21 or 22, wherein

The data gateway is further configured to save the first link local address interface identifier.