CN101111067A - Communication method between mobile terminal and access gateway - Google Patents

Abstract

The present invention discloses two communication methods between a mobile terminal and an access gateway. One is that the mobile terminal switches from a source access gateway to a target access gateway, and after the target access gateway becomes a service access gateway, the The mobile terminal is notified of its own address; the other is that the mobile terminal sends the address of the target access gateway when the source access gateway is still the serving access gateway during the switching process from the source access gateway to the target To the mobile terminal, so that the terminal can know the change of the service access gateway in time, and the signaling between the mobile terminal and the access gateway can be sent to the correct target; and when the session management is performed by the switched access gateway, it can be processed normally Signaling between the mobile terminal and the access gateway.

Description

Communication method between mobile terminal and access gateway

technical field

The invention relates to the field of service mobility management, in particular to a communication method between a mobile terminal and an access gateway.

Background technique

The CDMA2000 system includes a CDMA 1x network and a high-speed packet data (HRPD) network, which can provide data rates up to 153.6kbps and support packet data services such as video on demand (VOD), online games, and high-speed data downloads. In the CDMA2000 system, it is very important to effectively manage service mobility. One of the purposes of service mobility management is to ensure service continuity when the location of the mobile terminal changes.

The structure diagram of the packet domain of the CDMA2000 system is shown in Figure 1. The solid line in the figure is the transmission path for carrying data, and the dotted line is the transmission path for signaling. The mobile terminal is within the coverage of the access network/packet control function (AN/PCF), and the packet data serving node (PDSN) connects the mobile terminal to the IP network through the point-to-point protocol (PPP), and at the same time provides the next hop for the packet data packet routing, and assign IP addresses to mobile terminals through the IP Control Protocol (IPCP).

In the CDMA2000 system, if a handover occurs between access networks (AN) connected to the same PDSN, that is, the serving PDSN before and after the handover is the same PDSN, then this handover is called an intra-PDSN handover; Handover occurs between ANs, that is, the serving PDSN before and after the handover is not the same PDSN, and this handover is called inter-PDSN handover. For intra-PDSN handover, since no access point is changed and no change of IP address is involved, only link handover is required to maintain service continuity. As for inter-PDSN handover, the access point has changed. At this time, the continuity of the service cannot be maintained through simple link switching, and other methods are required to maintain the continuity of the service.

In the CDMA 1x system, when the terminal moves to the coverage area of another PDSN and causes handover between PDSNs, the data is forwarded through the layer 2 tunnel between the two PDSNs, so that the PPP endpoint remains at the source PDSN without changing the access point. The address of the terminal can be kept unchanged, so as to maintain the continuity of the business.

However, if the PPP endpoint remains unchanged at the source PDSN, it will cause A10 connections and point-to-point (P-P) connections to exist concurrently during the active packet session, thereby increasing the burden on the source PDSN and consuming the processing resources and resources of the source PDSN. Link resources between PDSNs. Therefore, during the inter-PDSN handover process of the HRPD network, the session state of the source PDSN will be transferred to the target PDSN after handover, so that the network access point of the mobile terminal becomes the target PDSN. The handover process is shown in Figure 2, specifically include:

1) The mobile terminal performs inter-PDSN handover, and establishes an A10 connection between the target access network and the target PDSN;

2) The target PDSN establishes a P-P connection to the source PDSN, the source PDSN transmits session context information such as the point-to-point protocol (PPP) status, service quality parameters, and mobility status of the mobile terminal to the target PDSN, and the target PDSN establishes the terminal's Session state, becoming the current serving PDSN;

3) The source PDSN sends data to the target PDSN through the P-P connection, and the target PDSN forwards the data to the target access network, and the corresponding session management and data processing are performed in the target PDSN, and the IP address of the mobile terminal remains unchanged;

4) The source PDSN releases the A10 connection with the source access network.

In addition, after the mobile terminal switches between PDSNs, the target PDSN can also use proxy mobile IP signaling to register with the home agent (HA), and bind the IP address of the mobile terminal with the address of the target PDSN. At this time, the HA No further packet data from outside will be sent to the source PDSN. When the mobile terminal sleeps or renegotiates the session, or after the target PDSN registers with the HA through the proxy mobile IP, the target PDSN releases its P-P connection to the source PDSN.

At present, the 3rd Generation Partnership Project 2 (3GPP2) standard organization is conducting research on network evolution projects. Its main purpose is to enhance packet switching capabilities, simplify network structure, improve QoS, reduce delay, increase user data rate, and increase system capacity. and coverage, reduce operating costs, etc., so that the evolved packet network can more effectively provide real-time services and non-real-time services, and provide users with more abundant services.

The structure of the evolved network is shown in FIG. 3 , wherein the control access point (CAP) has functions of an access gateway (AGW) and radio resource management. The main function of the access gateway is to serve as the first hop router of the mobile terminal, as well as some functions of the original PDSN such as mobility management and QoS support. The wireless resource management includes public resource management, dedicated resource management, wireless session management, maintaining the session state of the mobile terminal, and wireless link management. The Network Mobility Agent (NMA) provides a Layer 3 (L3) mobility management mechanism between CAPs and does not require mobile IP signaling over the air interface.

When the mobile terminal accesses the evolved network, the address obtained through the CAP is valid within the scope of the entire NMA, and the CAP registers and binds the address of the mobile terminal with the address of the CAP itself in the NMA so that data can be routed correctly. Therefore, when switching between CAPs, there is no need to change addresses. After registration and binding, the packet data of the mobile terminal received by the NMA will be sent to the target CAP, and then forwarded to the mobile terminal by the target CAP. The specific switching process is as follows:

1) The mobile terminal switches between CAPs, and the source CAP transmits the session context information of the mobile terminal to the target CAP through signaling;

2) The target CAP initiates a registration binding to the NMA, and associates the address of the mobile terminal with the address of the target CAP. After registration and binding, the packet data sent to the mobile terminal received by the NMA will be forwarded to the target CAP, and then transmitted to the mobile terminal by the target CAP.

During the above inter-AGW handover process, including inter-PDSN handover in CDMA 1x network and HRPD network, and inter-CAP handover in evolved network, the mobile terminal does not know the address of the AGW after handover. When the mobile terminal and the AGW perform signaling interaction, the target of the signaling is still the source AGW. After the target AGW receives the signaling between the mobile terminal and the AGW, since the target address of the signaling is not its own, it will fail to process normally.

For example, in an HRPD network, if an inter-PDSN handover occurs, the session state of the mobile terminal is transferred to the target PDSN after the handover, and flow mapping is also performed on the target PDSN after the handover. Once any component of the traffic flow template (TFT) changes, such as adding/deleting media flow, changing the flow processing method, changing the destination address or port, the mobile terminal will use the resource reservation protocol (RSVP) signaling to update the TFT. However, since the terminal does not know that the PDSN managing the mobile terminal has been transferred, the target address of the RSVP message is still the source PDSN. After the target PDSN receives the RSVP message, since the target address is not its own, the target PDSN will not perform corresponding processing. As a result, the mobile terminal cannot perform the TFT update operation.

Contents of the invention

The purpose of the present invention is to provide a communication method between a mobile terminal and an access gateway, so that after the mobile terminal switches between access gateways, the new access gateway can normally process the signaling between itself and the mobile terminal.

In order to achieve the above object, the present invention provides two communication methods between the mobile terminal and the access gateway,

The first includes:

A. When the mobile terminal switches from the source access gateway to the target access gateway, after the target access gateway becomes the current serving access gateway, notify the mobile terminal of its own address;

B. After the mobile terminal obtains the address of the target access gateway, when sending signaling between itself and the serving access gateway, the destination address is the address of the target access gateway.

Step A specifically includes:

a. The mobile terminal switches between access gateways. The source access gateway transfers the context information of the mobile terminal to the target access gateway. After the target packet data service node establishes the session state of the mobile terminal, it becomes the current service access gateway. gateway;

b. The target access gateway notifies the mobile terminal of its own address.

Described step b specifically comprises:

The target access gateway sends its own address to the mobile terminal immediately after becoming the serving packet data serving node.

Described step b specifically comprises:

When the target access gateway receives the signaling between the mobile terminal whose destination address is not its own address and the access gateway, it sends its own address to the mobile terminal.

Described step b specifically comprises:

The target access gateway sends its own address to the mobile terminal when receiving signaling between the mobile terminal whose destination address is the source access gateway before the handover and the access gateway.

The address of the target access gateway is a globally routable address or a link-local address or a foreign agent care-of address or an interface identifier of the target access gateway.

The access gateway is a packet data service node in a high-speed packet data network or a control access point in an evolution network.

When the access gateway is a packet data service node, the target packet data service node notifies the mobile terminal of its own address to specifically perform the following steps:

The target packet data serving node sends an IP configuration request message to the mobile terminal, which carries its own address.

When the access gateway is a packet data service node, the target packet data service node notifies the mobile terminal of its own address to specifically perform the following steps:

The vendor extension protocol that extends the existing point-to-point protocol, the protocol message carries the address of the packet data service node, and by sending the message, the target packet data service node notifies the mobile terminal of its own address.

When the access gateway is a packet data service node, the target packet data service node notifies the mobile terminal of its own address to specifically perform the following steps:

The target packet data service node sends the session update message carrying its own address to the target packet control function through the A11 interface, and the target packet control function forwards the address to the target access network, and the target access network utilizes the air interface Signaling sends the address to the mobile terminal.

When the access gateway is a packet data service node, the target packet data service node notifies the mobile terminal of its own address to specifically perform the following steps:

If there is a connection between the source packet data service node and the target packet data service node, the source packet data service node sends a notification message to the target packet data service node, and the target packet data service node receives the notification After the message, the session update message carrying its own address is sent to the target group control function through the A11 interface, and the target group control function forwards the address to the target access network, and the target access network uses air interface signaling to send the The above address is sent to the mobile terminal.

When the access gateway is a packet data service node, the target packet data service node notifies the mobile terminal of its own address to specifically perform the following steps:

The target packet data serving node sends a router advertisement or an agent advertisement to the mobile terminal, which carries its own address.

When the access gateway is a control access point, the target control access point notifies the mobile terminal of its own address to specifically perform the following steps:

The target control access point sends its own address to the mobile terminal through air interface signaling.

When the access gateway is a control access point, the target control access point notifies the mobile terminal of its own address to specifically perform the following steps:

The target control access point sends a router advertisement or an agent advertisement to the mobile terminal, which carries its own address.

When the access gateway is a control access point, the target control access point notifies the mobile terminal of its own address to specifically perform the following steps:

When the target control access point has become the service control access point and there is a connection with the source control access point, the source control access point sends a notification message to the target control access point through the connection , the target control access point sends its own address to the mobile terminal through air interface signaling.

The second type includes:

During the handover process of the mobile terminal from the source access gateway to the target access gateway, the source access gateway learns the address of the target access gateway, and when the source access gateway is still a serving access gateway, the source access gateway will The address of the target access gateway is sent to the mobile terminal, and after the mobile terminal obtains the address, when sending signaling between itself and the serving access gateway, the destination address is the address of the target access gateway.

The access gateway is a packet data service node in a high-speed packet data network or a control access point in an evolution network.

When the access gateway is a packet data service node, the source access gateway sends the address of the target access gateway to the mobile terminal to specifically perform the following steps:

Extend the existing point-to-point protocol manufacturer extension protocol, carry the address of the packet data service node in the protocol message, when the source packet data service node is still serving the packet data service node, by sending this message, the target The packet data serving node address is notified to the mobile terminal.

When the access gateway is a packet data service node, the source access gateway sends the address of the target access gateway to the mobile terminal to specifically perform the following steps:

When the source packet data service node is still the serving packet data service node and there is a connection with the mobile terminal, a session update message carrying the address of the target packet data service node is sent to the source packet control function through the A11 interface, The source packet control function forwards the address to the source access network, and the source access network sends the address to the mobile terminal by using air interface signaling.

When the access gateway is a control access point, the source access gateway sends the address of the target access gateway to the mobile terminal to specifically perform the following steps:

When the source control access point is still the service control access point, and the source control access point still has a connection with the mobile terminal, the source control access point sends the target control access point to the target control access point through air interface signaling The address is sent to the mobile terminal.

It can be seen from the above technical solution that the present invention performs switching from the source access gateway to the target access gateway through the mobile terminal, and after the target access gateway becomes the service access gateway, it notifies the mobile terminal of its own address; When the ingress gateway is still the service access gateway, the address of the target access gateway is sent to the mobile terminal. That is, when a switch between access gateways occurs, the network side actively sends the address of the target access gateway to the mobile terminal, so that the terminal can know the change of the serving access gateway in time, and the signaling between the mobile terminal and the access gateway can be sent to the correct target; and when the switched access gateway performs session management, the signaling between the mobile terminal and the access gateway can be normally processed.

Description of drawings

Fig. 1 is the packet domain structural diagram of CDMA2000 system in the background technology;

Fig. 2 is the flow chart that mobile terminal switches between HRPD network access gateway in the background technology;

FIG. 3 is a structural diagram of an evolved network in the background technology;

4 is a flowchart of a communication method between a mobile terminal and a target packet serving node in an HRPD network according to Embodiment 1 of the present invention;

FIG. 5 is a flowchart of a communication method between a mobile terminal and a target control access point in an evolved network according to Embodiment 1 of the present invention.

Detailed ways

The main idea of the two communication methods between the mobile terminal and the access gateway provided by the present invention is: after the mobile terminal switches from the source access gateway to the target access gateway, and the target access gateway becomes the serving access gateway, the mobile terminal notifies itself of its address to the mobile terminal; or during the handover process between access gateways, if the source access gateway is still the serving access gateway, send the address of the target access gateway to the mobile terminal. That is, when a handover between access gateways occurs, the network side actively sends the address of the target access gateway to the mobile terminal, so that the terminal can know the change of the serving access gateway in time.

The following two methods for communicating between a mobile terminal and an access gateway provided by the present invention will be described in detail with examples respectively.

Embodiment one:

This embodiment is an embodiment of the first communication method between a mobile terminal and an access gateway. Refer to FIG. 4 for details. FIG. 4 is a flowchart of a communication method between a mobile terminal and a target packet serving node in an HRPD network according to Embodiment 1 of the present invention. Include the following steps:

Step 401, the mobile terminal performs handover between access gateways, the source PDSN sends the context information of the mobile terminal to the target PDSN, and the target PDSN becomes the current serving PDSN after establishing the session state of the mobile terminal. At this time, there may still be a P-P connection between the source and target PDSN, or the P-P connection may have been released.

Step 402, the target PDSN notifies the mobile terminal of its own address.

The target PDSN can send its own address to the mobile terminal immediately after becoming the serving access gateway; it can also send its own address to the mobile terminal when receiving signaling between the mobile terminal and the PDSN whose destination address is not its own address; or the target When the PDSN receives the signaling between the mobile terminal whose destination address is the source PDSN before handover and the PDSN, it sends its own address to the mobile terminal, because the target PDSN has obtained the address of the source PDSN during the handover process.

In addition to the general IP address, the address of the target PDSN can be a foreign agent care-of address (FA CoA) when based on IPv4, and can be an interface identifier (Interface identifier) of the target PDSN when based on IPv6.

The target PDSN can notify the mobile terminal of its own address in the following ways:

1) The target PDSN sends an IP configuration request message (IP Configure Request) to the mobile terminal, which carries its own address. When based on IPv6, use IPv6 IP Configure Request, which carries Interface identifier.

2) Extending the existing point-to-point protocol (PPP) vendor extension protocol, carrying the address of the PDSN in the protocol message, and by sending the message, the target PDSN notifies the mobile terminal of its own address.

The extension method is: set the type (Kind) parameter to 5, indicating that the message is used for address notification; set the subtype (Type) parameter, when the value is 1, it means that the value of the subsequent address parameter is an IPv4 address, when it is 2 Indicates the IPv6 address, and when it is 3, it indicates the IPv6 interface identifier; the address (AddressInfo) parameter is set to indicate the target PDSN, and different contents are set according to the value of the Type field. After expansion, the protocol structure is shown in Table 1:

Code Code field, set to 0 according to the PPP vendor extension agreement Identifier Identification domain, set according to PPP protocol Length Length field, set according to PPP protocol Magic Number Magic number, set according to PPP protocol OUI 0xCF0002 kind 5 means address notification message, 6 means response message, if it is a response message, the latter two fields do not need to contain type Subtype, 1 means IPv4 address, 2 means IPv6 address, 3 means IPv6 interface identifier, others are reserved AddressInfo Indicates the address information of the PDSN, and sets different contents according to the Type field.

Table 1

3) The target PDSN sends the session update message (A11-SessionUpdate) carrying its own address to the target PCF through the A11 interface, and the target PCF forwards the address to the target AN, and the target AN sends the address to the mobile terminal through the air interface signaling, and the air interface Signaling may be based on the Generic Attribute Update Protocol (GUAP).

4) When there is a P-P connection between the source PDSN and the target PDSN, the source PDSN sends a notification message to the target PDSN through the P-P interface, and the target PDSN sends the A11-SessionUpdate message carrying its own address to the target PCF through the A11 interface, and the target PCF Send the A9-Update-A8 message carrying the target PDSN address to the target AN through the A9 interface, and the target AN sends the address to the mobile terminal through air interface signaling, and the air interface signaling can use the GAUP protocol.

5) The target PDSN sends a router advertisement (Router Advertisement) to the mobile terminal, which carries its own address.

6) The target PDSN sends an Agent Advertisement to the mobile terminal, which carries its own address.

Step 403: After obtaining the address, the mobile terminal takes the address as the destination address of the message when it performs signaling interaction with the target PDSN, for example, when sending an RSVP-based Resv message to the target PDSN to update the TFT. When based on IPv6, the address consists of a 64-bit link-local address prefix FE80::/64 and the Interface identifier of the target PDSN.

5 is a flow chart of a communication method between a mobile terminal and a target control access point in an evolved network according to Embodiment 1 of the present invention, including the following steps:

In step 501, the mobile terminal switches between access gateways, and its context information is transferred to the target CAP. After establishing the session state of the mobile terminal according to the context information, the target CAP becomes the current serving access gateway.

Step 502, the target CAP notifies the mobile terminal of its own address.

The target CAP can send its own address to the mobile terminal immediately after becoming the serving CAP; it can also send its own address to the mobile terminal when receiving signaling between the mobile terminal and the CAP whose destination address is not its own address; When the signaling between the mobile terminal and the CAP whose destination address is the source CAP before the handover, send its own address to the mobile terminal, because the target CAP has already obtained the address information of the source CAP when the handover is performed.

Except the general IP address, the address of the target CAP can be a foreign agent care-of address (FA CoA) when based on IPv4, and can be an interface identifier when based on IPv6.

The target CAP notifies the mobile terminal of its own address in the following ways:

1) The target CAP sends its own address to the mobile terminal through air interface signaling.

2) The target CAP sends a Router Advertisement (Router Advertisement) to the mobile terminal, which carries its own address.

3) The target CAP sends an Agent Advertisement to the mobile terminal, which carries its own address.

Step 403: After obtaining the address, the mobile terminal uses the address as the destination address of the message when it performs signaling interaction with the target CAP.

Embodiment two:

This embodiment is another embodiment of the communication method between the mobile terminal and the access gateway. The difference between this embodiment and Embodiment 1 is that, during the handover process between access gateways, the source access gateway can learn the address of the target access gateway, for example, in an HRPD network, when a P-P connection is established between the target PDSN and the source PDSN , the target PDSN will send its own address to the source PDSN, and then the source access gateway will send the address to the mobile terminal.

Wherein, in the HRPD network, the source PDSN sends the address of the target PDSN to the mobile terminal as follows:

1) When the source PDSN is still the serving PDSN, the source PDSN can use the aforementioned extended PPP vendor extension protocol to send the target PDSN address information to the mobile terminal.

2) When the source PDSN is still the serving PDSN and there is still a connection with the mobile terminal, the session update message (A11-SessionUpdate) carrying the target PDSN address can be sent to the source PCF through the A11 interface, and the source PCF sends the session update message (A11-SessionUpdate) through the A9 interface The A9-Update-A8 message carrying the target PDSN address is sent to the source AN, and the source AN sends the target PDSN address to the mobile terminal through air interface signaling, and the air interface signaling can use the GAUP protocol.

In an evolved network, the method for the source CAP to send the address of the target CAP to the mobile terminal is as follows:

1) When the source CAP is still the serving CAP, and the source CAP still has a connection with the mobile terminal, the source CAP sends the address information of the target CAP to the mobile terminal through the air interface

2) When the target CAP has become the serving CAP and there is a P-P connection between the source CAP and the target CAP, the source CAP sends a notification to the target CAP through the P-P interface, and the target CAP sends its own address information to the mobile terminal through air interface signaling.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalent replacement without departing from the spirit and scope of the technical solutions of the present invention.

Claims (20)

1. the communication means of portable terminal and IAD is characterized in that, comprising:

A, when portable terminal switches to target access gateway from source access gateway, after described target access gateway becomes the current service IAD, give described portable terminal with self address notification;

After B, described portable terminal obtained the address of described target access gateway, when sending self with the signaling of serving between IAD, destination address was the address of described target access gateway.

2. the communication means of portable terminal according to claim 1 and IAD is characterized in that steps A specifically comprises:

A, portable terminal carry out switching between IAD, and source access gateway is transferred to target access gateway with the contextual information of described portable terminal, after the targeted packets data serving node is set up the session status of described portable terminal, become the current service IAD;

B, described target access gateway are given described portable terminal with the address notification of self.

3. the communication means of portable terminal according to claim 2 and IAD is characterized in that, described step b specifically comprises:

Described target access gateway sends to described portable terminal with self address immediately after becoming the service packet data serving node.

4. the communication means of portable terminal according to claim 2 and IAD is characterized in that, described step b specifically comprises:

Described target access gateway sends to described portable terminal with self address when receiving portable terminal that destination address is not self address and the signaling between IAD.

5. the communication means of portable terminal according to claim 2 and IAD is characterized in that, described step b specifically comprises:

Described target access gateway sends to described portable terminal with self address when receiving destination address for the portable terminal of source access gateway before switching and the signaling between IAD.

6. the communication means of portable terminal according to claim 2 and IAD is characterized in that, described IAD is packet data serving node in the high-speed grouped data network or the control access point in the evolvement network.

7. the communication means of portable terminal according to claim 1 and IAD is characterized in that, the address of described target access gateway is overall routable address or link local address or the foreign agent care-of address or the interface identifier of target access gateway.

8. the communication means of portable terminal according to claim 6 and IAD is characterized in that, when described IAD was packet data serving node, the targeted packets data serving node specifically carried out following steps for portable terminal self address notification:

Described targeted packets data serving node sends the IP configuration request message to portable terminal, wherein carries the address of self.

9. the communication means of portable terminal according to claim 6 and IAD is characterized in that, when described IAD was packet data serving node, the targeted packets data serving node specifically carried out following steps for portable terminal self address notification:

Expand manufacturer's Extended Protocol of existing peer-peer protocol, the address of in this protocol message, carrying packet data serving node, by sending this message, described targeted packets data serving node is given portable terminal with self address notification.

10. the communication means of portable terminal according to claim 6 and IAD is characterized in that, when described IAD was packet data serving node, the targeted packets data serving node specifically carried out following steps for portable terminal self address notification:

Described targeted packets data serving node sends to the targeted packets controlled function by the session updates message that the A11 interface will carry self address, described targeted packets controlled function is transmitted to target access network with described address, and described target access network utilizes space interface signaling that described address is sent to portable terminal.

11. the communication means of portable terminal according to claim 6 and IAD is characterized in that, when described IAD was packet data serving node, the targeted packets data serving node specifically carried out following steps for portable terminal self address notification:

Between source packet data serving node and targeted packets data serving node, exist under the situation about being connected, described source packet data serving node sends a notification message to described targeted packets data serving node, after described targeted packets data serving node receives described notification message, the session updates message that to carry self address by the A11 interface sends to the targeted packets controlled function, described targeted packets controlled function is transmitted to target access network with described address, and described target access network utilizes space interface signaling that described address is sent to portable terminal.

12. the communication means of portable terminal according to claim 6 and IAD is characterized in that, when described IAD was packet data serving node, the targeted packets data serving node specifically carried out following steps for portable terminal self address notification:

Described targeted packets data serving node sends router advertisement or Agent Advertisement to portable terminal, wherein carries the address of self.

13. the communication means of portable terminal according to claim 6 and IAD is characterized in that, described IAD is control during access point, and the target control access point specifically carries out following steps for portable terminal self address notification:

Described target control access point sends to portable terminal by space interface signaling with self address.

14. the communication means of portable terminal according to claim 6 and IAD is characterized in that, described IAD is control during access point, and the target control access point specifically carries out following steps for portable terminal self address notification:

Described target control access point sends router advertisement or Agent Advertisement to portable terminal, wherein carries the address of self.

15. the communication means of portable terminal according to claim 6 and IAD is characterized in that, described IAD is control during access point, and the target control access point specifically carries out following steps for portable terminal self address notification:

When the target control access point has become service control access point, and control under the situation that existence is connected between the access point with the source, described source control access point sends a notification message to described target control access point by this connection, and described target control access point sends to described portable terminal by space interface signaling with self address.

16. the communication means of portable terminal and IAD is characterized in that, comprising:

Portable terminal switches to the process of target access gateway from source access gateway, source access gateway is known the address of target access gateway, when described source access gateway is still served IAD, described source access gateway sends to described portable terminal with the address of target access gateway, after described portable terminal obtains this address, when sending self with the signaling of serving between IAD, destination address is the address of described target access gateway.

17. the communication means of portable terminal according to claim 17 and IAD is characterized in that, described IAD is packet data serving node in the high-speed grouped data network or the control access point in the evolvement network.

18. the communication means of portable terminal according to claim 18 and IAD, it is characterized in that, when described IAD was packet data serving node, described source access gateway sent to portable terminal with the target access gateway address and specifically carries out following steps:

Expand manufacturer's Extended Protocol of existing peer-peer protocol, in this protocol message, carry the address of packet data serving node, when the source packet data serving node remains the service packet data serving node, by sending this message, give portable terminal with described targeted packets data serving node address notification.

19. the communication means of portable terminal according to claim 18 and IAD, it is characterized in that, when described IAD was packet data serving node, described source access gateway sent to portable terminal with the target access gateway address and specifically carries out following steps:

When the source packet data serving node remains the service packet data serving node, and under the situation about being connected between existence and described portable terminal, the session updates message that to carry targeted packets data serving node address by the A11 interface sends to the source Packet Control Function, described source Packet Control Function is transmitted to the source Access Network with described address, and described source Access Network utilizes space interface signaling that described address is sent to portable terminal.

20. the communication means of portable terminal according to claim 18 and IAD is characterized in that, when described IAD was the control access point, described source access gateway sent to portable terminal with the target access gateway address and specifically carries out following steps:

When control access point in source remains service control access point, and source control access point also exists under the situation about being connected with described portable terminal, and described source control access point sends to portable terminal by space interface signaling with the address of target control access point.

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