CN1960566A - Evolution mobile communication network, method for managing mobility between 3GPP and non-3GPP access network - Google Patents

Abstract

The invention relates to an evolved mobile communication system network architecture and a mobility management method under the non-roaming situation between a mobile IP-based non-3GPP access system and a 3GPP access system. The network architecture of the evolved mobile communication system adds an access system gateway function module, which includes the function of the gateway GPRS support node in the 3GPP system, and provides the connection between the mobile communication network and the external data network, and completes the access of data services and Transmission; enhanced mobility management function module, which includes the mobility management control function in the existing 3GPP system, manages and saves information related to the terminal, manages the roaming of the terminal between UTRAN and E-UTRAN, and manages the terminal in E-UTRAN Mobility management within; and a heterogeneous access mobility management module, which uses IP-based mobility management technology to manage mobility between 3GPP access networks and non-3GPP access networks. In this mobility management method, the above three modules are used to allocate the IP address of the terminal.

Description

Evolved mobile communication network and mobility management method between 3GPP and non-3GPP access networks

technical field

The present invention relates to mobile communication technology, in particular to non-roaming between non-3GPP and 3GPP (The 3rd Generation Partnership Project third-generation partnership project) access systems based on mobile IP under the evolving mobile communication network architecture approach to mobility management.

Background technique

In order to ensure the competitiveness of the 3GPP system in the next 10 years or even longer, an access technology evolution work is being carried out within the 3GPP organization. Especially in order to strengthen the ability of the 3GPP system to handle the rapidly growing IP data services, the use of packet technology in the 3GPP system needs to be further enhanced. The most important parts of this kind of technological evolution include: reduced delay, higher user data rate, enhanced system capacity and coverage, and reduction of the overall cost of operators. Moreover, the backward compatibility of the evolved network structure to the existing network and the seamless handover with non-3GPP access systems (such as: WLAN) are also important indicators.

The requirements for such an evolved network architecture are listed below:

Must support 3GPP and non-3GPP access systems;

Interoperate with 3GPP system release 6;

The response time of the control plane of the network to the terminal from the idle state to the active state shall not exceed 200 milliseconds;

The terminal needs to establish a basic IP connection during the access initialization phase;

Mobility management between different access technologies needs to support session continuity and seamless handover;

The mobility management between the evolved mobile communication network and the existing 3GPP network should be optimized to achieve the goal of supporting seamless switching of real-time and non-real-time services.

In the existing 3GPP system structure, the structure of the user data plane is shown in Figure 1. As can be seen from Figure 1, the transmission of user data needs to go through GGSN (Gateway GPRSSupport Node Gateway GPRS Support Node), SGSN (Serving GPRS Support Node Service GPRS Support Node), UTRAN (UMTS Terrestial Radio Access Network UMTS Terrestrial Radio Access Network) can reach the terminal, the delay generated by this far exceeds the delay required by the evolved network, so for the original 3GPP network structure Simplification is one of the key points of this patent.

Contents of the invention

The purpose of the present invention is to address the above-mentioned requirements. Firstly, a novel evolved mobile communication network system architecture is proposed. Then, aiming at this evolved mobile communication network system architecture, a mobile communication between the 3GPP access system and the non-3GPP is proposed. The solutions to sexual management problems are as follows:

A kind of mobile communication network system of evolution of the present invention mainly comprises the core network of evolution and the UMTS terrestrial wireless access network of evolution, it is characterized in that also comprising following function module:

An access system support node function module ASSN, which undertakes the control function of the 3GPP access gateway;

A heterogeneous access system mobility management module Hetero-AS-MM, which uses IP-based mobility management technology to manage mobility between 3GPP access networks and non-3GPP access networks.

The access system service function module ASSN includes the function of the gateway GPRS support node in the 3GPP system.

The access system service function module ASSN also includes mobility management and AAA control functions.

The access system service function module ASSN manages and saves the registration and session information related to the terminal, and manages the roaming mobility management of the terminal between 3GPP access networks.

The access system serving node function module ASSN has an interface with one or more of SGSN, E-UTRAN, and UTRAN.

The interface protocol of the interface is an enhanced protocol based on GTP, or an enhanced protocol based on other mobile IP protocols.

The interface protocol between the access system serving node function module ASSN and the heterogeneous access system mobility management module Hetero-AS-MM can be, but not limited to, the enhanced Gi interface Gi+.

The interface protocol between the heterogeneous access system mobility management module Hetero-AS-MM and the non-3GPP access system is based on IP mobility management technology.

The IP-based mobility management technology may, but is not limited to, adopt the mobility management technology described in the Mobile IP protocol.

The access system service node functional module ASSN and the heterogeneous access system mobility management module Hetero-AS-MM may be the same entity or different entities.

The present invention also proposes a mobility management method between the evolved 3GPP access system and the non-3GPP access network under the above-mentioned evolved mobile communication network system, when the terminal obtains an IP address while initiating a registration process to the network , so that the terminal initiates a service request or responds to a service request initiated by the network.

The IP address in the registration process may be the IP address assigned by the ASSN in the Hetero-AS-MM, evolved mobile communication network system or the gateway PDG of the non-3GPP access network during the initial access stage of the terminal. address, to achieve the purpose of supporting basic IP connections.

The use of the Hetero-AS-MM to assign the IP address of the terminal is that when the terminal is registered, the access system gateway applies for an IP address from the Hetero-AS-MM for the terminal, and the Hetero-AS-MM distributes the IP address for the terminal At the same time, a mapping table between the IP address of the registered terminal and the access gateway is formed.

The access system gateway may be an ASSN in an evolved mobile communication access system, or a gateway PDG in a non-3GPP access system.

When the external data packet arrives at Hetero-AS-MM, it will encapsulate the data packet according to the formed mapping entry and then forward it to the corresponding access system gateway, which will decapsulate the data packet and send it to the terminal.

When the terminal switches between access systems, the terminal will send a registration request similar to mobile IP to Hetero-AS-MM, and Hetero-AS-MM will update the mapping relationship according to the request, so that the terminal can be registered in the new access network Data can be sent and received normally.

The evolved mobile communication network system access system support node function module ASSN and the heterogeneous access system mobility management module Hetero-AS-MM are the same entity, and the access system support node function module ASSN itself can undertake the heterogeneous access system The mobility management module Hetero-AS-MM functions as a local agent HA in mobile IP. When the terminal roams to other access systems, the ASSN will assume the function of a local agent in mobile IP and manage terminal data.

When the non-3GPP access gateway PDG assigns an IP address, the PDG assumes the function of the HA in the mobile IP. When the terminal roams from the non-3GPP access network to the 3GPP access network, the 3GPP access gateway ASSN will assume the mobile IP address. The function of the FA in the middle and initiates a mobile IPv4 registration request to the PDG (HA). After that, the PDG forwards all the data to the terminal to the 3GPP access network where the terminal is located through the tunnel technology.

The IP address is allocated by Hetero-AS-MM. The registration process when the terminal is powered on to access the 3GPP access network or the terminal is powered on to access the non-3GPP access network is as follows:

After the terminal is turned on, it attaches to the 3GPP or non-3GPP network, and requests an IP address from Hetero-AS-MM for the terminal through ASSN or PDG;

The Hetero-AS-MM assigns an IP address to the terminal, and adds a mapping between the IP address and the IP address of the ASSN or PDG in the mapping table. And return the request response and the assigned IP address to complete the registration process.

The IP address is allocated by the Hetero-AS-MM, and the entire downlink data flow of communicating with the terminal when the terminal is powered on to access the 3GPP access network or the terminal is powered on to access the non-3GPP access network is: when the Hetero-AS-MM After receiving the data packet of the terminal, query the ASSN or PDG connected to the terminal from the mapping table, then encapsulate the data packet into a data packet to ASSN or PDG through IP-in-IP encapsulation, and send it to ASSN or PDG. The ASSN or PDG obtains the original data packet through decapsulation, and then uses the internal transmission mechanism of the access network to send the data packet to the terminal.

When a terminal enters a non-3GPP access network from a 3GPP access network or enters a 3GPP access network from a non-3GPP access network, the registration process is as follows:

The terminal first attaches to a non-3GPP or 3GPP access network and initiates a mobile IPv4-like registration request to Hetero-AS-MM through PDG or ASSN;

Hetero-AS-MM updates the entry corresponding to the terminal in the mapping table, and responds to the registration request to complete the entire registration process.

When a terminal enters a non-3GPP access network from a 3GPP access network or enters a 3GPP access network from a non-3GPP access network, the data transmission process is as follows: Query the new access network gateway connected to the terminal in the table, and then encapsulate the data packet into a data packet destined for the new access network gateway through IP-in-IP encapsulation, and send it to the new access network gateway. The ingress network gateway obtains the original data packet through decapsulation, and then uses the internal transmission mechanism of the access network to send the data packet to the terminal.

When the IP address is allocated by the ASSN or the IP address is allocated by the PDG, the 3GPP or non-3GPP access network is the home network of the terminal. At this time, the registration process is as follows:

After the terminal is powered on, it attaches to a 3GPP or non-3GPP network;

ASSN or PDG assigns an IP address to the terminal and sends an attach acceptance to the terminal, including the assigned IP address, and completes the registration process;

When the IP address is allocated by the ASSN or the IP address is allocated by the PDG, the data transmission process of the terminal communication is: when the ASSN or PDG obtains the original data packet, use the existing 3GPP or WLAN internal transmission mechanism to send the data packet to the terminal.

When a terminal enters a non-3GPP access network from a 3GPP access network or enters a 3GPP access network from a non-3GPP access network, the registration process is as follows:

The terminal first attaches to the non-3GPP or 3GPP access network and initiates a mobile IPv4 registration request to the ASSN through the PDG or to the PDG through the ASSN, including the IP address of the PDG or ASSN as the CoA of the terminal;

The ASSN or PDG creates a piece of binding information between the home address of the MN and the CoA reported by the MN for the terminal, and responds to the registration request to complete the entire registration process.

When a terminal enters a non-3GPP access network from a 3GPP access network or enters a 3GPP access network from a non-3GPP access network, the data transmission process of terminal communication is as follows: ASSN or PDG will send proxy ARP information to intercept the information sent to the terminal but For the data routed to the home network, when the ASSN or PDG receives the data packet of the terminal, it queries the CoA of the terminal from the mobile IP mapping table, and then encapsulates the data packet into a The CoA data packet is sent to the PDG or ASSN of the non-3GPP or 3GPP access network visited by the terminal. The PDG or ASSN obtains the original data packet through decapsulation, and then uses the internal transmission mechanism of the access network to send the data packet to terminal.

When assigning IP addresses by ASSN, the evolved mobile communication network architecture can be simplified, the 3GPP access network is the home network of the terminal, and the Hetero-ASMM functional module is integrated into the ASSN.

When the IP address is allocated by the PDG, the evolved mobile communication network architecture can be simplified, the non-3GPP access network is the home network of the terminal, and the Hetero-ASMM function is integrated into the PDG.

The evolved mobile communication network structure proposed by the present invention can well meet the requirements for the system architecture evolution scheme formulated by the 3GPP organization. And based on the idea of mobile IPv4, a complete mobility management solution between the 3GPP access system and the non-3GPP access system is proposed, so that the roaming of the terminal between the 3GPP system and the WLAN access network can achieve seamless switching and Continuity of Session. Moreover, this solution is also applicable to mobility management among other non-3GPP access systems.

Description of drawings

FIG. 1 is a plane diagram of user data in an existing UMTS network;

Fig. 2 is the evolved network system architecture of the present invention;

Fig. 3 is the user data plane of the evolved mobile communication network;

Fig. 4 is the workflow of moving IPv4;

Fig. 5 is the data transmission when the terminal visits the network;

Figure 6 is the boot registration process;

Fig. 7 is the communication process of the data sent to the terminal;

FIG. 8 is a registration process for a terminal entering a WLAN access network from a 3GPP access network;

Fig. 9 is the data transmission of the terminal in WLAN;

Figure 10 is the boot registration process;

Figure 11 is the data sent to the terminal;

Figure 12 is a registration process for a terminal entering a 3GPP access network from a WLAN access network;

Figure 13 is the data transmission of the terminal in 3GPP;

Fig. 14 is the mobile communication network structure that evolves under the situation that assigns IP address on ASPDG;

Figure 15 is the boot registration process;

Fig. 16 is the communication process of the data sent to the terminal;

Figure 17 is a registration process for a terminal entering a WLAN access network from a 3GPP access network;

Figure 18 is the data transmission of the terminal in the WLAN;

Fig. 19 is the mobile communication network structure evolved under the condition of allocating IP addresses on the PDG;

Figure 20 is the boot registration process;

Fig. 21 is the communication process of the data sent to the terminal;

Figure 22 is a registration process for a terminal entering a WLAN access network from a 3GPP access network;

Figure 23 is the data transmission of the terminal in 3GPP.

Detailed ways

Below in conjunction with the accompanying drawings, the architecture of the evolved mobile communication network system of the present invention is described in detail as follows:

Figure 2 is the evolved network system architecture based on the present invention. As shown in the figure, there are several explanations for the evolved network system architecture:

1. Hetero-AS MM (Heterogeneous-Access System-Mobility Management heterogeneous access system mobility management), access system support node function module (ASSN), each function module does not mean that it is a functional entity, these two functions Modules can be implemented on the same entity, or on two different entities.

2. The function of Hetero-ASMM is mainly to manage the mobility between 3GPP access network and non-3GPP access network. The access technology is agnostic, so the mobility management technology it adopts should be IP-based mobility management technology.

3. The main functions of the access system support node function module (ASSN) are:

1) The connection between the mobile communication network and the external data network, providing data transmission between the evolved network and the external data network;

2) Play the role of a router to complete functions such as access and transmission of data services;

3) Manage and save the MM (Mobility Management) context related to the terminal, bearer description context, terminal ID, status, user security parameters, user subscription information, etc.;

4) Roaming between UTRAN and E-UTRAN used to manage terminals, mobility management within E-UTRAN, etc.;

4. From the perspective of the user data plane, it only goes through the ASSN->E-UTRAN two-layer stage, so that the user data plane of the evolved mobile communication network is shown in Figure 3 on the user plane. The user data plane of the evolved network is greatly simplified. Only ASSN←→E-UTRAN←→UE (terminal) is required to transmit data, and the data delay is greatly reduced.

Under the described evolved mobile communication network structure, the mobility management solution between non-3GPP and 3GPP networks is described as follows:

From the above description of the evolved mobile communication network structure, it can be obtained that the mobility management between non-3GPP and 3GPP networks under the evolved mobile communication network structure is completed by Hetero-AS-MM, and is based on IP mobility management. It is agnostic to the underlying access technology, that is to say, the mobility management solution designed by the present invention is not only applicable to mobility management between 3GPP systems and non-3GPP systems, but also applicable to mobility between non-3GPP systems manage.

The IP mobility management scheme adopted in the present invention is a specific implementation based on the mobile IPv4 technology.

Fig. 4 is a working flow chart of mobile IPv4, as shown in the figure, the working process is as follows:

1. MN (Mobile Node, mobile terminal) establishes a connection with GW (gateway) (such as ASSN or PDG);

2. The function module of the FA (Foreign Agent, foreign agent) of the mobile IP of GW sends an FA broadcast message, which includes the address of FA, to use as the CoA (Care-of Address) of MN;

3. After receiving the broadcast message, the MN judges that it leaves the home network (HomeNetwork) and enters a visited network. Then send a mobile IPv4 registration request RRQ, including CoA;

4. In order to authenticate the user, the FA inquires with the AAA server of the user's home network. The home AAA server provides a home agent HA and its IP address to the FA;

5. FA forwards the user's RRQ to HA;

6. The HA queries the AAA server for the key preset by the MN-HA. This step only occurs during the first registration, and then the MN does not need to request the key when it connects to other FAs;

7-8. The HA accepts the registration of the MN, generates the binding of the home IP address of the MN and the CoA address, and returns a mobile IPv4 registration response.

When the terminal is visiting the network, the data to the terminal is transmitted according to the process in FIG. 5 . As shown in the figure, when the terminal is visiting the network, the HA will send proxy ARP information to intercept the data sent to the terminal but routed to the home network. When the HA receives the terminal's data packet, it queries the terminal's CoA from the mobile IP mapping table, then encapsulates the data packet into a CoA data packet through IP-in-IP encapsulation, and sends it to the terminal visit network. The FA obtains the original data packet by decapsulating it, and then sends the data packet to the terminal using the internal transmission mechanism of the visited network.

The present invention is a specific implementation in the above-mentioned evolved mobile communication network system based on the above-mentioned flow. According to the requirements of the evolved mobile communication network system, the network needs to assign an IP address to support the basic IP connection when the terminal MN is turned on and initialized for access. In this way, according to the different scenarios where the IP addresses are assigned by the three functional modules of Hetero-AS-MM, ASSN, and PDG, the implementation of Mobile IPv4 and the relationship between different modules in the network are different, which also leads to the work of the entire Mobile IP The difference in flow process, the novelty of the present invention is exactly in these different concrete realizations:

1. The IP address is allocated by Hetero-AS-MM

In this case, the terminal can access the 3GPP network through the ASSN, or access the non-3GPP network through the PDG, and the three functional modules of Hetero-AS-MM, ASSN, and PDG should be regarded as Three different functional entities, and what Hetero-AS-MM undertakes is the HA in Mobile IP. In this case, the 3GPP access network and the non-3GPP access network are under the same IP subnet, and the data cannot be transmitted to the correct destination simply by using the above-mentioned mobile IP protocol. In this case, a new mechanism must be used, which is implemented as follows:

1) First, it is clear that the terminal requests IP address allocation through ASSN or PDG;

2) When Hetero-AS-MM responds to the address allocation request, it will locally make a mapping table similar to CoA and home address between the address allocated by the terminal and the IP address of the ASSN or PDG connected to the terminal;

3) When there is a data packet from the outside to the Hetero-AS-MM, it will encapsulate it as the destination address as the ASSN or PDG address mapped in the table according to the relationship of the mapping table;

4) Then, Hetero-AS-MM can forward it to the correct ASSN or PDG;

5) When the terminal enters another access network, it will send a mapping relationship update request to Hetero-AS-MM through the new ASSN or PDG; after receiving the update request, Hetero-AS-MM will update the corresponding The mapping relationship enables the terminal to still receive and send data normally in the new access network. The structure of its most basic mapping table is as follows: Terminal IP address The IP address of the corresponding ASSN or PDG survival time

2. Assign IP address by ASSN

In this case, the terminal accesses the 3GPP network after being powered on. At this time, ASSN itself assumes the function of HA in mobile IP. When the terminal roams from a 3GPP access network to a non-3GPP access network, PDG will assume the function of FA in mobile IP and initiate a mobile IPv4 registration request to ASSN (HA). . Afterwards, the ASSN forwards all the data to the terminal to the non-3GPP access network where the terminal is located through the tunnel technology.

3. The IP address is assigned by PDG

This situation is similar to that in 2.2.2.2, and the PDG assumes the function of HA in Mobile IP. When the terminal roams from a non-3GPP access network to a 3GPP access network, the ASSN will assume the function of the FA in the mobile IP and initiate a mobile IPv4 registration request to the PDG (HA). Afterwards, the PDG forwards all the data to the terminal to the 3GPP access network where the terminal is located through the tunnel technology.

Specific examples:

According to the specific solutions of the entire invention described above, the embodiments of the present invention are also divided into three scenarios where IP addresses are allocated by Hetero-AS-MM, ASSN, and PDG. In addition, in this embodiment, WLAN represents a non-3GPP access system, and the entire evolved mobile communication network architecture is shown in FIG. 2 .

1. The IP address is allocated by Hetero-AS-MM

Figure 6 is a registration process for the terminal to start up and access the 3GPP access network, as shown in Figure 6, including the following steps:

1) After the terminal is turned on, it attaches to the 3GPP network;

2) ASSN requests an IP address from Hetero-AS-MM for the terminal;

3) Hetero-AS-MM authenticates the terminal to AAA;

4) Hetero-AS-MM allocates an IP address for the terminal, and adds a mapping between the IP address and the IP address of the ASSN in the mapping table. And return a request response including the IP address to the ASSN;

5) The ASSN sends an attach acceptance to the terminal, including the assigned IP address;

6) The terminal sends an attach completion to the network.

Figure 7 is the communication flow of data sent to the terminal. When the terminal communicates, the entire downlink data flow is as follows:

When Hetero-AS-MM receives the terminal's data packet, it queries the ASSN connected to the terminal from the mapping table, and then encapsulates the data packet into a data packet to the ASSN through IP-in-IP encapsulation, and Send to ASSN. The ASSN obtains the original data packet through decapsulation, and then sends the data packet to the terminal using the internal transmission mechanism of the existing 3GPP network.

Figure 8 shows the registration process of the terminal entering the WLAN access network from the 3GPP access network; when the terminal enters the WLAN access network from the 3GPP access network, the terminal will initiate a registration request similar to mobile IPv4 through the PDG, and the entire process is as follows:

1) The terminal first attaches to the WLAN access network;

2) The terminal initiates a mobile IPv4-like registration request to the Hetero-AS-MM through the PDG;

3) Hetero-AS-MM authenticates the terminal to AAA;

4) Hetero-AS-MM updates the entry corresponding to the terminal in the mapping table and responds to the registration request. There are two options for updating here, one is to update the original entry, and the other is to add a new one about PDG mapping entry;

5) The PDG sends a registration acceptance to the terminal to complete the entire registration process.

Figure 9 shows the data transmission of the terminal in the WLAN. After the terminal is attached to the WLAN access network, the data transmission process is as follows:

When Hetero-AS-MM receives the terminal's data packet, it queries the PDG connected to the terminal from the mapping table, and then encapsulates the data packet into a data packet to the PDG through IP-in-IP encapsulation, and Send to PDG. The PDG obtains the original data packet through decapsulation, and then sends the data packet to the terminal using the transmission mechanism inside the existing WLAN network.

Figure 10 shows the registration process for the terminal to access the WLAN access network when it is powered on, and the registration process when it is powered on is as follows:

1) After the terminal is turned on, it attaches to the WLAN network;

2) PDG requests an IP address from Hetero-AS-MM for the terminal;

3) Hetero-AS-MM authenticates the terminal to AAA;

4) The Hetero-AS-MM allocates an IP address for the terminal, and adds a mapping between the IP address and the IP address of the PDG in the mapping table. And return a request response including the IP address to the PDG;

5) The PDG sends an attach acceptance to the terminal, including the assigned IP address;

6) The terminal sends an attach completion to the network.

Figure 11 is the communication flow of data sent to the terminal. When the terminal communicates, the entire downlink data flow is as follows:

When Hetero-AS-MM receives the terminal's data packet, it queries the PDG connected to the terminal from the mapping table, and then encapsulates the data packet into a data packet to the PDG through IP-in-IP encapsulation, and Send to PDG. The PDG obtains the original data packet through decapsulation, and then sends the data packet to the terminal using the transmission mechanism inside the existing WLAN network.

Figure 12 shows the registration process of the terminal entering the 3GPP access network from the WLAN access network. After the terminal enters the 3GPP access network from the WLAN access network, the terminal will initiate a registration request similar to mobile IPv4 through the ASSN. The entire process is as follows:

1) The terminal first attaches to the 3GPP access network;

2) The terminal initiates a mobile IPv4-like registration request to Hetero-AS-MM through the ASSN;

3) Hetero-AS-MM authenticates the terminal to AAA;

4) Hetero-AS-MM updates the entry corresponding to the terminal in the mapping table and responds to the registration request. There are two options for updating here, one is to update the original entry, and the other is to add a new ASSN mapping entry;

5) The ASSN sends a registration acceptance to the terminal to complete the entire registration process.

Figure 13 The data transmission of the terminal in 3GPP. After the terminal is attached to the 3GPP access network, the data transmission process is as follows:

When Hetero-AS-MM receives the data packet of the terminal, it queries the ASSN connected to the terminal from the mapping table, and then encapsulates the data packet into a data packet to the ASSN through IP-in-IP encapsulation, and sent to ASSN. The ASSN obtains the original data packet through decapsulation, and then sends the data packet to the terminal using the internal transmission mechanism of the existing 3GPP network. IP address is assigned by ASSN

2. Assign IP address by ASSN

In this case, the 3GPP access network is the home network of the terminal, so the ASSN itself or a certain node in the 3GPP access network can be regarded as an HA. In this embodiment, the HA function is integrated into the ASSN. Therefore, the evolution The 3G network architecture can be simplified as the evolved mobile communication network architecture in the case of assigning IP addresses on the ASSN as shown in FIG. 14 . At this point, the registration process of the terminal is shown in Figure 15:

1) After the terminal is turned on, it attaches to the 3GPP network;

2) ASSN assigns an IP address to the terminal and sends an attach acceptance to the terminal, including the assigned IP address;

3) The terminal sends an attach completion to the network.

When the terminal communicates, the entire downlink data flow is shown in Figure 16:

After the ASSN obtains the original data packet, it uses the internal transmission mechanism of the existing 3GPP network to send the data packet to the terminal.

After the terminal enters the WLAN access network from the 3GPP access network, the terminal will initiate a mobile IPv4 registration request to the ASSN through the PDG. The process is shown in Figure 17. The entire process of the terminal entering the WLAN access network from the 3GPP access network as follows:

1) The terminal first attaches to the WLAN access network;

2) The terminal initiates a mobile IPv4 registration request to the ASSN through the PDG, which includes the IP address of the PDG as the CoA of the terminal;

3) ASSN verifies the terminal to AAA;

4) The ASSN creates a piece of binding information between the home address of the MN and the CoA reported by the MN for the terminal, and responds to the registration request;

5) The PDG sends a registration acceptance to the terminal to complete the entire registration process.

After the terminal is attached to the WLAN access network, the data transmission process is shown in Figure 18. The data transmission process of the terminal in the WLAN is as follows:

When a terminal accesses the network in the WLAN, the ASSN will send a proxy ARP message to intercept the data sent to the terminal but routed to the home network. When the ASSN receives the terminal's data packet, it queries the terminal's CoA from the mobile IP mapping table, then encapsulates the data packet into a CoA data packet through IP-in-IP encapsulation, and sends it to the terminal The visited WLAN accesses the PDG of the network, and the PDG obtains the original data packet through decapsulation, and then sends the data packet to the terminal by using the transmission mechanism inside the existing WLAN network.

3. IP address assigned by PDG

In this case, the WLAN access network is the home network of the terminal, so the PDG itself or a node in the WLAN access network can be regarded as an HA. In this embodiment, the HA function is integrated into the PDG. Therefore, the evolution The 3G network architecture can be simplified as the evolved mobile communication network architecture in the case of allocating IP addresses on the PDG as shown in FIG. 19 . At this time, the registration process of the terminal is as shown in Figure 20:

1) After the terminal is turned on, it attaches to the WLAN network;

2) The PDG assigns an IP address to the terminal and sends an attach acceptance to the terminal, including the assigned IP address;

3) The terminal sends an attach completion to the network.

When the terminal communicates, the entire downlink data flow is shown in Figure 21 as the communication flow of the data sent to the terminal. When the PDG obtains the original data packet, it uses the transmission mechanism inside the existing WLAN network to send the data packet to the terminal.

After the terminal enters the 3GPP access network from the WLAN access network, the terminal will initiate a mobile IPv4 registration request to the PDG through the ASSN. The process is shown in Figure 22. The registration process of the terminal entering the WLAN access network from the 3GPP access network as follows:

1) The terminal first attaches to the 3GPP access network;

2) The terminal initiates a mobile IPv4 registration request to the PDG through the ASSN, which includes the IP address of the ASSN as the CoA of the terminal;

3) PDG authenticates the terminal to AAA;

4) The PDG creates a piece of binding information between the home address of the MN and the CoA reported by the MN for the terminal, and responds to the registration request;

5) The ASSN sends a registration acceptance to the terminal to complete the entire registration process.

After the terminal is attached to the 3GPP access network, the data transmission of the terminal in 3GPP is shown in Figure 23, and the data transmission process is as follows:

When the terminal accesses the network in 3GPP, the PDG will send proxy ARP information to intercept the data sent to the terminal but routed to the home network. When the PDG receives the terminal's data packet, it queries the terminal's CoA from the mobile IP mapping table, then encapsulates the data packet into a CoA data packet through IP-in-IP encapsulation, and sends it to the terminal The ASSN of the visited 3GPP access network, the ASSN obtains the original data packet through decapsulation, and then sends the data packet to the terminal using the internal transmission mechanism of the existing 3GPP network.

Claims (28)

1. An evolved mobile communication network system, mainly comprising an evolved core network and an evolved UMTS terrestrial radio access network, characterized in that it also includes the following functional modules: An access system support node function module ASSN, which undertakes the control function of the 3GPP access gateway; A heterogeneous access system mobility management module Hetero-AS-MM, which uses IP-based mobility management technology to manage mobility between 3GPP access networks and non-3GPP access networks. 2. The evolved mobile communication network system according to claim 1, characterized in that: said access system service function module ASSN includes the function of a gateway GPRS support node in a 3GPP system. 3. The evolved mobile communication network system according to claim 1, characterized in that: said access system service function module ASSN also includes mobility management and AAA control functions. 4. The evolved mobile communication network system according to claim 3, characterized in that: said access system service function module ASSN manages and saves registration and session information related to the terminal, and manages the terminal's access to the network in 3GPP move between. 5. The evolved mobile communication network system according to claim 1, characterized in that: The access system serving node function module ASSN has an interface with one or more of SGSN, E-UTRAN, and UTRAN. 6. The evolved mobile communication network system according to claim 5, wherein the interface protocol of the interface is an enhanced protocol based on GTP, or an enhanced protocol based on other mobile IP protocols. 7. The evolved mobile communication network system according to claim 1, characterized in that: the interface protocol between the access system service node function module ASSN and the heterogeneous access system mobility management module Hetero-AS-MM can be enhanced Type Gi interface Gi+. 8. The evolved mobile communication network system according to claim 1, characterized in that: the interface protocol between the heterogeneous access system mobility management module Hetero-AS-MM and the non-3GPP access system is based on IP mobility management technology. 9. The evolved mobile communication network system according to claim 8, characterized in that the mobility management technology based on IP can be the mobility management technology described in the Mobile IP protocol. 10. The evolved mobile communication network system according to claim 1, characterized in that: said access system service node function module ASSN and heterogeneous access system mobility management module Hetero-AS-MM can be located in one entity or in different entities. 11. A mobility management method between an evolved 3GPP access system and a non-3GPP access network under the evolved mobile communication network system of claim 1, wherein the terminal obtains An IP address, the terminal uses this IP address to initiate a service request or respond to a service request initiated by the network. 12. The mobility management method between the evolved 3GPP access system and the non-3GPP access network according to claim 11, characterized in that: the IP address in the registration process can be the IP address in the terminal startup initialization interface In the entry stage, use the IP address assigned by Hetero-AS-MM, ASSN in the evolved mobile communication network system, or the gateway PDG of the non-3GPP access network to support basic IP connections. 13. The method for managing mobility of a terminal between a 3GPP access system and a non-3GPP access system according to claim 12, characterized in that: the use of Hetero-AS-MM to assign the terminal's IP address is when the terminal When registering, the access system gateway applies for an IP address from Hetero-AS-MM for the terminal, and Hetero-AS-MM allocates an IP address for the terminal, and forms a mapping between the registered terminal's IP address and the access gateway surface. 14. The mobility management method between the evolved 3GPP access system and the non-3GPP access network according to claim 13, characterized in that: the access system gateway can be an evolved mobile communication access system The ASSN in or the gateway PDG of the non-3GPP access system. 15. The mobility management method of the terminal between the 3GPP access system and the non-3GPP access system according to claim 13 or 14, characterized in that: when the external data packet arrives at the Hetero-AS-MM, it will be based on the formed The mapping entry encapsulates the data packet and forwards it to the corresponding access system gateway, and the access system gateway decapsulates the data packet and sends it to the terminal. 16. The method for managing the mobility of a terminal between a 3GPP access system and a non-3GPP access system according to claim 13, characterized in that: when the terminal switches between access systems, the terminal will send a Hetero-AS- MM sends a registration request similar to mobile IP, and Hetero-AS-MM updates the mapping relationship according to the request, and the terminal receives and sends data in the new access network. 17. The mobility management method between the evolved 3GPP access system and the non-3GPP access network according to claim 12 or 13, characterized in that: said evolved mobile communication network system access system supports node function module ASSN The heterogeneous access system mobility management module Hetero-AS-MM is located in the same entity, and the access system support node function module ASSN itself can undertake the function of the heterogeneous access system mobility management module Hetero-AS-MM, as a mobile IP When the terminal roams to other access systems, the ASSN will assume the role of the local agent in Mobile IP to manage the terminal data. 18. The mobility management method between the evolved 3GPP access system and the non-3GPP access network according to claim 12 or 14, characterized in that: when the non-3GPP access gateway PDG allocates an IP address, the PDG undertakes The function of HA in mobile IP, when the terminal roams from a non-3GPP access network to a 3GPP access network, the 3GPP access gateway ASSN will assume the function of FA in mobile IP and initiate a mobile IPv4 registration request to PDG (HA), and then , the PDG forwards all data to the terminal to the 3GPP access network where the terminal is located through the tunneling technology. 19. The mobility management method between the evolved 3GPP access system and the non-3GPP access system according to claim 13, characterized in that: the IP address is allocated by Hetero-AS-MM, and the terminal is powered on to access the 3GPP access network or The registration process when the terminal is powered on to access a non-3GPP access network is as follows: After the terminal is turned on, it attaches to the 3GPP or non-3GPP network, and requests an IP address from Hetero-AS-MM for the terminal through ASSN or PDG; Hetero-AS-MM allocates an IP address for the terminal, and adds a mapping between the IP address and the IP address of the ASSN or PDG in the mapping table, and returns a request response and the allocated IP address to complete the registration process. 20. The mobility management method between the evolved 3GPP access system and the non-3GPP access system according to claim 19, characterized in that: said Hetero-AS-MM assigns IP addresses, and the terminal starts to access the 3GPP access system. The entire downlink data flow of communication with the terminal when the terminal is connected to the network or the terminal is turned on to access a non-3GPP access network is: when the Hetero-AS-MM receives the data packet of the terminal, it queries the mapping table ASSN or PDG, and then encapsulate the data packet into a data packet to ASSN or PDG through IP-in-IP encapsulation, and send it to ASSN or PDG, ASSN or PDG obtains the original data packet through decapsulation, and then uses the access network internal The transport mechanism sends the data packet to the terminal. 21. The method for managing mobility of a terminal between a 3GPP access system and a non-3GPP access system according to claim 19, characterized in that: when the terminal enters a non-3GPP access network from a 3GPP access network or enters a non-3GPP access network from a non-3GPP access network The registration process for entering the 3GPP access network is: The terminal first attaches to a non-3GPP or 3GPP access network and initiates a registration request to Hetero-AS-MM through PDG or ASSN; Hetero-AS-MM updates the entry corresponding to the terminal in the mapping table, and responds to the registration request to complete the entire registration process. 22. The method for managing mobility of a terminal between a 3GPP access system and a non-3GPP access system according to claim 21, wherein: when the terminal enters a non-3GPP access network from a 3GPP access network or accesses a network from a non-3GPP The data transmission process when entering the 3GPP access network is: when the Hetero-AS-MM receives the data packet of the terminal, it queries the new access network gateway connected to the terminal from the mapping table, and then through the IP-in -IP encapsulation encapsulates the data packet into a data packet to the new access network gateway and sends it to the new access network gateway. The new access network gateway obtains the original data packet through decapsulation, and then uses the transmission process inside the access network Send the packet to the terminal. 23. The mobility management method between the evolved 3GPP access system and the non-3GPP access system according to claim 12 or 14, characterized in that: when the IP address is allocated by the ASSN or the IP address is allocated by the PDG, the The 3GPP or non-3GPP access network is the home network of the terminal. At this time, the registration process is as follows: After the terminal is powered on, it attaches to a 3GPP or non-3GPP network; ASSN or PDG assigns an IP address to the terminal and sends an attach acceptance to the terminal, including the assigned IP address, and completes the registration process; 24. The mobility management method between the evolved 3GPP access system and the non-3GPP access system according to claim 25, characterized in that: when the IP address is allocated by the ASSN or the IP address is allocated by the PDG, the terminal communication The data transmission process is: after the ASSN or PDG obtains the original data packet, it uses the existing 3GPP or WLAN internal transmission mechanism to send the data packet to the terminal. 25. The method for managing mobility of a terminal between a 3GPP access system and a non-3GPP access system according to claim 23, wherein: when the terminal enters a non-3GPP access network from a 3GPP access network or accesses a network from a non-3GPP When entering the 3GPP access network, the registration process is: The terminal first attaches to the non-3GPP or 3GPP access network and initiates a mobile IPv4 registration request to the ASSN through the PDG or to the PDG through the ASSN, including the IP address of the PDG or ASSN as the CoA of the terminal; The ASSN or PDG creates a piece of binding information between the home address of the MN and the CoA reported by the MN for the terminal, and responds to the registration request to complete the entire registration process. 26. The mobility management method between the evolved 3GPP access system and the non-3GPP access system according to claim 25, characterized in that: when the terminal enters the non-3GPP access network from the 3GPP access network or accesses the network from the non-3GPP When entering the 3GPP access network, the data transmission process of terminal communication is as follows: ASSN or PDG will send proxy ARP information to intercept the data sent to the terminal but routed to the home network, when ASSN or PDG receives the data packet of the terminal , it queries the CoA of the terminal from the mobile IP mapping table, then encapsulates the data packet into a CoA data packet through IP-in-IP encapsulation, and sends it to the terminal's visited non-3GPP or 3GPP access network PDG or ASSN, PDG or ASSN obtains the original data packet through decapsulation, and then sends the data packet to the terminal by using the transmission process inside the access network. 27. The mobility management method for a terminal between a 3GPP access system and a non-3GPP access system according to claim 12 or 14, characterized in that: when the IP address is allocated by the ASSN, the 3GPP access network is the home network of the terminal, The Hetero-AS MM function module is integrated into the ASSN. 28. The mobility management method for a terminal between a 3GPP access system and a non-3GPP access system according to claim 12 or 14, characterized in that: when the IP address is allocated by the PDG, the non-3GPP access network is the home network of the terminal , the Hetero-AS MM function is integrated into the PDG.

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