CN1988711A - Moving method in gradual progress 3G system - Google Patents

Abstract

A method for moving in an evolved 3G system, comprising steps: an entity gateway responsible for user equipment mobility management sends a message to a mobility manager between access systems to inform the current access system type and the care-of address of the user equipment; The inter-system mobility manager saves the above information, and assigns a home IP address to the user equipment that has not been assigned a home address, and sends the address information to the gateway; the gateway sends a message to the user equipment to accept user registration. The present invention solves the problem of address management when user equipment moves between different access systems, thereby achieving the purpose of supporting seamless mobility of users. Through the present invention, when the user equipment moves and switches between different access systems, the establishment of the data channel is simple and fast, and the change of the user IP address is prevented, thereby ensuring the continuity of the session.

Description

Methods of Mobile in Evolved 3G Systems

technical field

The present invention relates to the third generation of mobile communication, and in particular to a mobile communication system (hereinafter referred to as E-UMTS) evolved on the basis of Universal Mobile Telecommunications System (hereinafter referred to as UMTS).

Background technique

Fig. 1 is a description of the network structure of the existing UMTS system. The mobile terminal 101 (hereinafter referred to as UE) is a device used to receive a called service or call and send a calling service or call. The base station 102 (hereinafter referred to as Node B) is a device that communicates with user equipment through wireless signals through sending and receiving devices. The air interface between UE and Node B involves physical layer and media access layer (hereinafter referred to as MAC layer). The physical layer is responsible for processing operations related to wireless signal transmission and reception, and the MAC is responsible for mapping different services to the physical layer. The controlling radio network controller (hereinafter referred to as CRNC) controls the radio resource management, allocation and use of each cell in the base station, and is responsible for allocating the radio resources in each cell to the user equipment UE. For the UE, the radio network controller RNC may be distinguished from a serving radio network controller (hereinafter referred to as SRNC) and a drift radio network controller (hereinafter referred to as DRNC). The SRNC is an entity that provides a radio resource control connection (hereinafter referred to as RRC) for the user equipment, through which the user equipment can send control signaling to the network and receive control signaling from the network. The SRNC obtains the network resources allocated to the user from the CRNC, and sends the resource configuration parameters to the user equipment through RRC signaling. In this way, the user equipment can communicate with the network. The interface between SRNC and user equipment is Uu interface. Serving GPRS Support Node 105 (hereinafter referred to as SGSN) is an entity responsible for managing the mobility management state and session management state of user equipment, and the mobility management of user equipment and the negotiation of session-related service quality also occur between UE and SGSN of. The interface between the SGSN and the SRNC of the user equipment is Iu, which is responsible for establishing the transmission channel of the user plane and the signaling connection for transmitting signaling for the transmission of user data. The gateway GPRS support node 106 (hereinafter referred to as GGSN) functions as a gateway for data transmission between user equipment and packet data network (hereinafter referred to as PDN). The GGSN allocates an Internet Protocol (hereinafter referred to as IP) address for the user equipment, and the data sent by the user and the data sent to the user are all identified by the address. The interface between GGSN and SGSN is called Gn, which is responsible for negotiating service quality between SGSN and GGSN, and establishing a user plane GPRS user plane tunnel (hereinafter referred to as GTP-U) for data transmission. The interface between the GGSN and the PDN is Gi, which has a wide range of functions and can be used to perform functions such as IP address allocation, authentication, and accounting for users. The main function of GGSN is to receive and analyze the received data, and then transmit the data belonging to a certain user equipment to the corresponding GTP-U tunnel.

Now, 3GPP is making a more reasonable evolution of the existing system based on Fig. Improve the system to meet the above requirements. The typical system structure is shown in Fig. 2 now.

The traditional second generation (2G) network is a GPRS network that supports packet domain services and a GSM system that only supports circuit domain networks. The traditional third generation (3G) network is a mobile communication system based on Wideband Code Division Multiple Access (WCDMA).

The user equipment 200 that supports switching between the 2G/3G system and the E-UMTS system can communicate with the E-RAN 201 and the 2G/3G RAN 204 through a wireless interface. The RAN of 2G/3G is the wireless access network defined in GPRS/GSM and UMTS. The radio access network RAN or E-RAN is mainly responsible for allocating radio resources and the like to the user equipment. The radio access network is connected to the core network, such as the Iu interface in FIG. 1 . In the E-UMTS, two functional modules belonging to the core network are defined, namely, a Mobility Management Entity (hereinafter referred to as MME) and a User Plane Entity (UPE) 202 . The MME is responsible for maintaining the status of user registration, mobility, security and bearer status. The MME saves the subscription data when the user registers, such as temporary and permanent user equipment identifiers, location area and other information. UPE is an entity responsible for processing user plane data. For user equipment in idle state, it serves as the termination point of downlink data user plane. When downlink data arrives, it is responsible for triggering the paging of the user equipment. These two entities can be physically in one part or in two parts. If it is separated, there will also be an interface between the UPE and the MME. The function of this interface is mainly for the MME to inform the UPE of the user's current location information and service information, so that the UPE can establish a user plane for the user's data transmission. .

The inter-access system mobility manager is responsible for the routing of user data and the allocation of IP addresses when the user equipment moves and switches between multiple access systems.

The SGSN in 205 2G/3G and the GGSN in 206 2G/3G are consistent with 105 and 106 in FIG. 1 .

In the 2G/3G system, the IP address of the user equipment is allocated by the GGSN206. In order not to affect the previous system, when the user equipment is in the 2G/3G system, its IP address is still allocated by the GGSN. However, if the address continues to be used as the address information for communication between the user equipment and other user equipment, user data will be routed to the GGSN, and if the user equipment moves to another access system, if the gateway of the new access system Or the UPE allocates another IP address for the user equipment, so that the continuity of the business and seamless mobility cannot be guaranteed.

Contents of the invention

The object of the present invention is to provide a method of moving in an evolved 3G system.

To achieve the above object, a method for moving in an evolved 3G system, comprising steps:

a) The physical gateway responsible for the mobility management of the user equipment sends a message to the inter-access system mobility manager to inform the current access system type and the care-of address of the user equipment;

b) The inter-access mobility manager saves the above information, and assigns a home IP address to the user equipment that has not yet been assigned a home address, and sends the address information to the gateway;

c) The gateway sends a message to the user equipment to accept user registration.

The present invention solves the problem of address management when user equipment moves between different access systems, thereby achieving the purpose of supporting seamless mobility of users. Through the present invention, when the user equipment moves and switches between different access systems, the establishment of the data channel is simple and fast, and the change of the user IP address is prevented, thereby ensuring the continuity of the session.

Description of drawings

Fig. 1 is the network structure of UMTS;

Figure 2 is the system structure of E-UMTS;

Fig. 3 is the first embodiment of the present invention;

Fig. 4 is the second embodiment of the present invention;

Fig. 5 is the signaling process of service initiation;

Fig. 6 is the behavior action of gateway;

Fig. 7 shows the actions of the mobility manager between access systems.

Detailed ways

In order to solve the above problems, a node is needed, which can assign a common IP address to the user equipment as an address for the user equipment to communicate with other user equipment, and this node is the inter-access mobility manager. This address becomes the home address of the user equipment, and the IP address assigned to the user by the gateway or UPE of different access systems can only be used as the care-of address of the user equipment, that is, the mobility manager between the access systems sends user data to the user according to the care-of address. The corresponding gateway or UPE, and then the gateway replaces the care-of address in the data packet with the home address of the user equipment through address correspondence, and sends it to the corresponding user equipment.

Figure 3 shows a first embodiment of the invention.

When the user equipment is turned on in the old access system, it needs to inform the network of its current location, and obtain parameters such as the temporary identifier assigned to it by the network. The user equipment sends a UE registration message 301 to the network, which includes the permanent identifier of the user equipment such as IMSI, the temporary identifier such as P-TMSI or TMSI, the network capability and access capability of the user equipment, and so on. This message is sent to the gateway entity responsible for user equipment mobility management, which is the SGSN in the 2G/3G system and the MME in the E-UMTS system. After the gateway receives the message, it first needs to communicate with the home location register HLR of the user equipment to obtain the authentication vector group of the user equipment to authenticate the user equipment and check whether the user is a legitimate user equipment. This process is not described in FIG. 3 because it has no necessary relationship with the present invention, but this process is a necessary step. Assuming that after receiving the 301, the gateway authenticates the user equipment and determines that the user equipment is trustworthy, then it assigns an IP address within the allocated IP address range to the user equipment, that is, the care-of address. The gateway sends a 302 UE IP address request message to the inter-access system mobility manager, which includes the IP address allocated by the gateway to the user equipment, the identifier IMSI of the user equipment, or a temporary identifier such as P-TMSI, and the current location of the user equipment The system type, such as GSM, GPRS, UMTS, E-UMTS and other information. After receiving the message, the inter-access mobility manager allocates the home IP address to the user, and stores it in the message 303 UE IP address response message. The message also includes the permanent identifier IMSI of the user equipment, and the temporary identifier such as P -TMSI and other information. Then the inter-access system mobility manager saves the access system type 305 where the user is located, the care-of address of the user equipment, and the home address allocated to the user equipment. After receiving the 303 message, the gateway obtains the home address assigned by the inter-access system mobility manager to the user equipment, and it needs to save the address and include the address in the message 304, which also includes the user's permanent identifier such as IMSI , temporary identifier such as P-TMSI, location information of user equipment such as tracking area identifier and other parameters. The gateway sends 304 a message UE Registration Accepted to the user equipment. After receiving the 304 message, the user equipment saves the home address assigned by the network as address information for communicating with other user equipment. The user equipment also needs to save the temporary identifier assigned by the network as an identifier for accessing the system in the future.

When the user equipment moves 306 to a new access system, it needs to perform a registration operation in the new system. Same as 301, the user equipment sends a message 307 UE registration to the gateway entity in charge of user equipment mobility management of the new system. The gateway entity is the SGSN in the 2G/3G system, and the MME in the E-UMTS system. The 307 message should include the user's temporary identifier such as P-TMSI, the home address of the user equipment, the network capability and access capability of the user equipment, and the like. After the gateway receives the message, it first needs to communicate with the home location register HLR of the user equipment to obtain the authentication vector group of the user equipment to authenticate the user equipment and check whether the user is a legitimate user equipment. This process is not described in FIG. 3 because it has no necessary relationship with the present invention, but this process is a necessary step. Assuming that after the gateway receives the 306, it authenticates the user equipment and determines that the user equipment is trustworthy, then it assigns an IP address within its assigned IP address range to the user equipment, that is, the care-of address. The care-of address is used as the IP address of the user equipment corresponding to the communication between the mobility manager and the gateway between the access systems. After the gateway authenticates the user equipment, it will request the HLR to update the location information of the user equipment, and cancel the location information of the gateway where the user equipment was previously located. All these processes can be realized by using existing messages and procedures, because they are not directly related to the present invention, and will not be described in detail here.

Then the gateway will send a message 308 UE IP address request to the mobility manager between the access systems, which contains the temporary identifier of the user equipment such as P-TMSI (this identifier should be assigned by the gateway of the new system), and the user equipment The permanent identification of the user equipment such as IMSI, the home IP address assigned by the user equipment, the new care-of address of the user equipment, the current system type of the user equipment, such as GSM, GPRS, UMTS, or E-UMTS. After receiving the message, 309 the Inter-Access System Mobility Manager updates its saved information about the user equipment's care-of address and the type of access system it is in, and correspondingly, also saves the new temporary identifier P-TMSI of the user equipment. Then the inter-access mobility manager sends a 310 UE IP address response message to the gateway, which is an acknowledgment of the 309 message, including a temporary identifier such as P-TMSI of the user equipment in the message. 311 The gateway saves the temporary identifier of the user equipment, the corresponding relationship between the care-of address and the home address, and sends a message to the user equipment that UE registers and accepts. The message includes the permanent identifier IMSI of the user equipment, the temporary identifier P-TMSI, the user equipment's Location information such as tracking area identification and other parameters. After receiving the 311 message, the user equipment saves the home address assigned by the network as address information for communicating with other user equipment. The user equipment also needs to save the temporary identifier assigned by the network as an identifier for accessing the system in the future.

What Fig. 4 has described is the second embodiment of the present invention.

Before inter-access system handover, the user equipment receives data in the old access system, and the direction of the data flow is shown in 401. The inter-access system mobility manager receives user data first as the final point of the data. The IP header of the user data takes the home address of the user equipment as the destination address, thus enabling the data flow to finally reach the inter-access system mobility manager. The inter-access mobility manager keeps the home address information of the user equipment. After receiving the data packet, it checks the IP address of the packet header to find out the corresponding care-of address of the user equipment. The inter-access mobility manager replaces the destination IP address in the IP data packet with the care-of address of the user equipment, and sends the data packet. Because the final node of the data packet is the node that assigns the forwarding IP address to the user equipment, that is, the gateway, when the gateway receives the data packet, it checks the destination address in the data packet header to know which user the data packet is for device, it then replaces the destination IP address of the packet with the home address of the user device. After the replacement is completed, if other processing of user data such as header compression, encryption and other operations are also placed on the gateway, then the gateway or UPE will perform corresponding operations on the data, and then send the user data to the user through the wireless interface equipment. The user equipment determines a unique IP flow according to the destination IP address, source IP address, source port number, destination port number and protocol type, so as to submit the user data to the real high-level application.

The old gateway will learn from the inter-access system mobility manager the access system type 402 to which the service can be applied, which is usually a parameter passed to the gateway by the inter-access system mobility manager when the service starts. This process will be described in Figure 5.

When the user equipment detects that the signal of a new access system is strong enough, the control entity of the radio access network (BSC or RNC in 2G/3G network, may be a base station or similar to RNC in E-UMTS) An entity of the function) sends a 403 measurement report message, which includes the measured signal quality of the new system. The specific measurement object and measurement value are related to the specific access system. Please refer to the specific literature. For example, the measurement of 3G system can refer to the definition in 3GPP TS25.331. When the control entity of the radio access network receives the 403 measurement report, if it believes that the signal of the target access system is strong enough to allow the user to switch to the target system without affecting the data reception of the user equipment, then the control entity of the radio access network To the mobility management entity (SGSN in 2G/3G or MME in E-UMTS), send 404 a handover requirement message, which includes parameters such as the identifier of the user equipment and the location information of the target access system where the user equipment is located. The mobility management entity checks whether the user's current service can be well supported in the target access system, and if so, it requires the gateway or UPE of the target access system to prepare network and radio interface resources 405 . This process is also closely related to each system. For example, in a 3G system, the SGSN will require the RNC where the target cell is located to be responsible for allocating wireless resources in the base station and network resources between the SGSN and the RNC. For the specific process, please refer to 3GPP TS25.413 and 25.331 and other specifications. After the radio resources are prepared in the target system, the gateway of the target access system will send a 407 UE access system update message to the inter-access system mobility manager, which contains the permanent identifier of the user equipment such as IMSI, temporary Information such as P-TMSI, care-of address of the user equipment, home address of the user equipment, access system type of the user equipment, etc. After receiving the message, the inter-access mobility manager stores information such as the permanent identifier of the user equipment, the care-of address of the user equipment, the home address of the user equipment, the type of the access system where the user equipment is located, and sends information to the target access system. The gateway returns a confirmation message 408 UE access system update confirmation. The message includes the identifier of the user equipment.

After the gateway of the target access system receives 408, it can confirm that the handover can continue. It sends a message 409 handover response to the mobility management entity of the source access system, and the message includes the identification of the user equipment, configuration commands of the user equipment in the target system and other parameters. The gateway of the source access system sends 410 a handover command to the control entity of the radio access network of the source access system, which includes the parameter user equipment identifier and configuration command of the user equipment in the target system. The control entity of the radio access network includes the configuration command of the user equipment in the target system in the handover execution in step 411, and notifies the user equipment of the parameter configuration information in the new access system. The user equipment configures its receiving and sending parameters according to the configuration parameters, and then the data sending and receiving in the new access system can be realized.

After the handover process is completed, the direction of the downlink data flow is shown in 412 . The inter-access system mobility manager receives user data as the final point of the data. The IP header of the user data uses the home address of the user equipment as the destination address, so that the data flow can finally reach the inter-access system mobility management device. The inter-access mobility manager keeps the home address information of the user equipment. After receiving the data packet, it checks the IP address of the packet header to find out the corresponding care-of address of the user equipment. The inter-access mobility manager replaces the destination IP address in the IP data packet with the care-of address of the user equipment, and sends the data packet. Because the final node of the data packet is the node that assigns the forwarding IP address to the user equipment, that is, the gateway, when the gateway receives the data packet, it checks the destination address in the data packet header to know which user the data packet is for device, it then replaces the destination IP address of the packet with the home address of the user device. After the replacement is completed, if other processing of user data such as header compression, encryption and other operations are also placed on the gateway, then the gateway or UPE will perform corresponding operations on the data, and then send the user data to the user through the wireless interface equipment. The user equipment determines a unique IP flow according to the destination IP address, source IP address, source port number, destination port number and protocol type, so as to submit the user data to the real high-level application. Because the identifier of the IP flow remains unchanged before and after the switchover, data continuity can be guaranteed.

When the service starts, the policy and charging rule entity PCRF will send the information such as the QoS policy and charging rules for the service to the mobility manager between access systems according to the configuration of the operator and the subscription data of the user equipment to 501 , the message not only includes the identification of the user equipment such as IP address, QoS policy and charging rules, but also includes information such as the type of access system to which the service can be applied. 502 The inter-access system mobility manager saves the received QoS policies and charging rules, and the type of access system to which the service can be applied. The inter-system mobility manager provides QoS to the gateway or UPE 503 according to the access system where the user equipment is located. The message includes information such as bandwidth of each IP flow, service type, and access system type applicable to the service. After the gateway receives the QoS, it saves the information and provides service quality assurance for the business according to the QoS parameters.

601 The gateway receives a UE registration message from the user equipment, and checks the permanent identifier of the user equipment such as IMSI and the temporary identifier such as P-TMSI included in the message. If there is only a permanent identifier such as IMSI in the message, the gateway needs to communicate with the HLR to obtain the authentication vector group of the user equipment, and use these authentication vectors to authenticate the user equipment. If the message contains a temporary identifier similar to P-TMSI, then the gateway needs to resolve the temporary identifier to obtain the old gateway where the user was before, and then communicate between the two gateways to obtain information such as the security context of the user equipment. The new gateway authenticates the user equipment through the obtained authentication vector group in the security context. If the network considers the user equipment to be authentic after authenticating the user equipment 602, the gateway sends a UE IP address request message 603 to the inter-access system mobility manager, which contains a temporary identifier of the user equipment such as P-TMSI , the permanent identifier of the user equipment such as IMSI, the care-of address assigned by the gateway to the user equipment, the access system type of the user equipment such as GSM or GPRS or UMTS or E-UMTS, and so on. Subsequently, if the gateway receives the UE IP address response message sent from the inter-system mobility manager 604, it saves the IP address contained in the message as the home address of the user equipment. Then send the UE registration acceptance message 605 to the user equipment, which includes the permanent identification of the user equipment such as IMSI, the temporary identification such as P-TMSI, the home IP address of the user equipment, the tracking area identification of the location of the user equipment and other information.

606 The gateway receives the switch request message sent by the radio access network control entity, and checks the target location information contained in the message, such as the cell ID, so as to know the type of the target access system. According to the type of access system applicable to the service stored in the gateway, check whether the service is allowed to be switched to the target access system (607). If allowed, the gateway sends a handover request message 608 to the gateway of the target access system, which includes the identity of the target cell where the user equipment is located, the identity of the user equipment, the service type used by the user equipment, and some 2 of the service /3 layer configuration and other information. With this information, the radio access network control entity of the target access system can perform operations such as resource reservation on the user. The gateway of the source access system knows the gateway of the access system where the target cell is located through information configured in advance by the network operator. Then, if the source access system gateway receives a message switching response 609 from the target access system gateway, it checks the message. If the message confirms that the handover has been accepted, and the message contains the configuration parameters for the user equipment to switch to the target access system, then the gateway sends a handover command to the user equipment, which includes the configuration parameters of the user equipment in the target access system Configuration parameters, including physical layer configuration, transmission channel configuration and other parameters. After configuration, the user equipment can send and receive data in the target access system.

When the gateway receives a handover request 611 sent from another gateway, it checks the parameters contained in the message, finds the location information of the user equipment, and communicates with the radio access network control entity where the cell is located, and provides information for the user equipment in the cell. Data reception preparation resources in the target cell. Then, the gateway sends a message 612 UE access system update to the inter-access system mobility manager, which includes the temporary identifier of the user equipment such as P-TMSI, the permanent identifier such as IMSI, and the current access ID of the user equipment. Information such as the system type, the home IP address of the user equipment, and the new care-of IP address of the user equipment. Then, if the gateway receives the 613 UE access system update confirmation message from the inter-access system mobility manager, it proves that the inter-access system mobility manager has accepted the update, and subsequent data will be forwarded to the new gateway. The gateway returns a Handover Response 614 message to the gateway of the source access system, and the message includes configuration parameters for handover of the user equipment to the target access system, user identification and other parameters.

The gateway receives the QoS information about the service and the type of access system applicable to the service sent by the inter-access system mobility manager, and saves the information for the service quality of the user equipment and the mobility of the user equipment in the future. .

The inter-access system mobility manager receives the UE IP address request message 701 sent by the gateway, checks the user equipment permanent identification such as IMSI and temporary identification such as P-TMSI contained in the message, saves them, and then sends the user equipment The device allocates an IP address within its IP address range, and includes this address in the response message UE IP Address Response message sent to the gateway 702. The message also contains the permanent identification and the temporary identification of the user equipment. After receiving the data packet sent to the IP address, the inter-access mobility manager will forward the data packet to the gateway according to the methods described in 401 and 412 .

The inter-access system mobility manager receives the UE access system update message 703 sent by the gateway, and checks the permanent identifier of the user equipment such as IMSI, the temporary identifier such as P-TMSI, the home address of the user equipment, and the user equipment included in the message. The device's care-of address, access system type and other information, if it is confirmed that the home address of the user equipment is provided by it, and the type of the target access system is allowed, then return the UE access system update confirmation message to the gateway, Otherwise, a UE access system update failure message is returned. The UE access system update acknowledgment message and the UE access system update failure should include information such as the permanent identifier of the user equipment such as IMSI and the temporary identifier such as P-TMSI. After receiving the data packet sent to the IP address, the inter-access mobility manager will forward the data packet to the gateway according to the methods described in 401 and 412 .

The inter-access system mobility manager receives the QoS parameters and charging rule parameters sent from the policy and charging rule functional entity 705, saves them in the context of the corresponding user equipment 706, and sends the QoS parameters to Gateway, the gateway can use this parameter to determine the standard of service quality for users.

In the present invention, the message between the gateway and the mobility manager between the access systems can also adopt the message type defined in the mobile IP. In Figure 3, the UE IP address request can be replaced by a binding update message, and the UE IP address response can be replaced by a binding confirmation message. For specific parameters, please refer to the definition in IETF RFC 3775. In Fig. 4, the UE access system update may be replaced by a binding update message, and the UE access system update confirmation may be replaced by a binding confirmation message. For specific parameters, please refer to the definition in IETF RFC 3775.

Claims (10)

1. method that moves in the 3G of evolution system comprises step:

A) the entity gateway of responsible subscriber equipment mobile management mobility manager between connecting system sends message, informs residing connecting system type of current user equipment and Care-of Address;

B) mobility manager is preserved above-mentioned information between connecting system, and gives the also IP address, user equipment allocation local of unallocated home address, and address information is sent to gateway;

C) gateway sends message to subscriber equipment, and the user registers acceptance.

2. method according to claim 1 is characterized in that the message of described step a) comprises: give the IP address of user equipment allocation, the sign IMSI of subscriber equipment, the provisional sign of subscriber equipment, the system type at the current place of subscriber equipment.

3. method according to claim 1 is characterized in that mobility manager between connecting system will replace to the Care-of Address of preservation with sending to IP address, destination in the IP packet of subscriber equipment.

4. method according to claim 1, it is characterized in that being responsible for the entity gateway of customer equipment data or user plane entity will replace to the home address of preservation with sending to IP address, destination in the IP packet of subscriber equipment.

5. method according to claim 1 is characterized in that mobility manager is informed gateway with the connecting system type that this business is suitable between connecting system when business begins.

6. method according to claim 1 is characterized in that also comprising step:

Mobility manager is issued gateway after user data is changed between connecting system.

7. method according to claim 6 is characterized in that described conversion comprises step:

The controlled entity of Radio Access Network sends handoff requirement message to Mobility Management Entity;

Mobility Management Entity requires the gateway of target access system to prepare the resource of network and wave point;

The gateway of target access system mobility manager between connecting system sends UE connecting system updating message;

Mobility manager is preserved updating message between connecting system, and returns acknowledge message to the gateway of target access system;

The gateway of target access system sends switching response message to the Mobility Management Entity of source connecting system.

8. method according to claim 7 is characterized in that described requirement message comprises: the positional information of the target access system at the sign of subscriber equipment, subscriber equipment place.

9. method according to claim 7 is characterized in that described updating message comprises: the connecting system type at the Care-of Address of the permanent sign of subscriber equipment, provisional sign, subscriber equipment, the home address of subscriber equipment, subscriber equipment place.

10. method according to claim 7 is characterized in that described switching response message comprises sign, the configuration order of subscriber equipment in goal systems of subscriber equipment.

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