KR100937321B1 - Method for handover of mobile IP between different network - Google Patents

Abstract

According to the present invention, in the mobile IP fast handover method between heterogeneous networks, SGSN is received when a measurement report message including L3 information is received from a wireless network controller of a second mobile communication network while a mobile terminal receives service through the first mobile communication network. Sends an activate PDP context request message to the SGSN, and sends a RAB allocation request message to the radio network controller, and the radio network controller establishes a radio link with a base station and then transmits a RAB configuration message to the mobile terminal. When the wireless link to the wireless network controller is established, the mobile station transmits a RAB setup complete message including its nCoA to the wireless network controller, and the wireless network controller responds to the RAB assignment including the nCoA. Sends a message to the SGSN, and sends a create PDP context request message including the nCoA to the GGSN The GGSN creates a tunnel with the access router based on the nCoA of the mobile terminal, and then transmits the tunneled data from the access router to the mobile terminal through the generated tunnel. It can provide seamless mobility to users based on Mobile IP service through optimized handover between layers.

Jong-Man Lee, Handover

Description

Mobile IP high speed handover method between heterogeneous networks {Method for handover of mobile IP between different network}

The present invention relates to a mobile IP fast handover method between heterogeneous networks, and more particularly, a wireless network controller broadcasts a measurement report message including L2 (Layer 2) information as well as L3 (Layer 3) information, and moves. The terminal generates its own new IP address (nCoA) based on the L3 information included in the measurement report message and includes the generated nCoA and FNA (Fast Neighbor Advertisement) messages in the RAB configuration completion message and transmits them to the radio network controller. The present invention relates to a mobile IP fast handover method between heterogeneous networks that provides seamless mobility to users based on Mobile IP service through inter-layer optimized handover that minimizes handover delay time.

With the increase of Internet users and the development of Internet application technology, Internet Protocol (IP) is widely used in related technologies such as wired and wireless communication networks as well as existing data networks.

Therefore, standardization of the next generation communication network is under the name of ALL-IP network in the direction of IP based configuration from terminal to core network.

In addition, Internet users require various services irrespective of the network type, and the construction of an interlocking network to satisfy the needs of these users is being visualized.

However, these networks have evolved independently and use different specifications and standards. Therefore, various matters such as architecture, protocol structure, mobility, quality of service, authentication, security, billing, etc. must be considered for interworking each network, and modification and supplementation of each matter must be accompanied.

As the interworking between these various networks becomes important, a handover scheme for the movement of the terminal in the interworking structure as well as the interworking structure is essential in order to provide a seamless service from the user side.

At present, the most common method is to use Mobile IP which is already used in Homogeneous Network, and methods such as Fast Handoff to reduce packet delay and loss of Mobile IP are mainly used.

However, such a conventional method performs handover by sending and receiving messages based on the IP layer, that is, Layer 3 (L3), so that there is a packet delay and a loss during the interval until delivery of the L3 message. there is a problem.

In addition, since the handover of the link layer, that is, the layer 2 (Layer 2, L2) and the handover of L3 proceeds sequentially, packet transmission to the terminal is impossible from the time point at which the L2 connection is disconnected to the time at which the L3 connection is made.

Accordingly, an object of the present invention is to efficiently perform mobile handover between heterogeneous networks for efficient handover between a time-division synchronous CDMA (TD-SCDMA) network and another network through optimization between the link layer (L2) and the network layer (L3). It is to provide a handover method.

It is still another object of the present invention to provide a mobile IP fast handover method between heterogeneous networks capable of minimizing handover time and packet loss by minimizing duplicate messages for each layer.

It is still another object of the present invention to provide a mobile IP fast handover method between heterogeneous networks that can provide seamless mobility to a user based on Mobile IP service through inter-layer optimized handover using L2 and L3 messages together. have.

According to an aspect of the present invention to achieve the above object, a base station for wireless section communication with a mobile terminal in a first mobile communication network including an access router, a wireless network controller for controlling the base station, the wireless network controller and A method for fast handover to a second mobile communication network including a SGSN connected to provide a service to a mobile terminal, an IP address assignment, and a GGSN for accessing an Internet packet network, the method comprising: (a) the mobile terminal accessing the first mobile communication network; If a measurement report message including L3 information is received from the radio network controller during service, transmitting an activate PDP context request message including network information to access the SGSN, (b) the activate PDP in the SGSN. if a context request message is received, transmitting a RAB assignment request message to the radio network controller, (c) the radio Establishing a radio link with the base station according to the RAB allocation request message in the network controller and transmitting a RAB configuration message to the mobile terminal; (d) from the mobile terminal to the wireless network controller according to the RAB configuration message; When the radio link is set, the step of transmitting a RAB setup complete message including its nCoA to the radio network controller, (e) the radio network controller to transmit a RAB assignment response message containing the nCoA to the SGSN (F) transmitting, by the SGSN, a create PDP context request message including the nCoA to the GGSN, and (g) creating a tunnel with the access router based on the nCoA of the mobile terminal in the GGSN, Send a create PDP context response message to the SGSN, and the tunneled data from the access router through the generated tunnel to the mobile terminal Provided is a mobile IP fast handover method between heterogeneous networks, including transmitting.

The measurement report message includes L3 information and L2 information including an IP address and a network prefix, and the network information to be accessed includes at least one of NSAPI, TI, PDP Type, PDP Address, Access Point Name, QoS Requested, and PDP Configuration Options. It includes one.

In the step (c), when the RAB allocation request message is received by the radio network controller, transmitting an RLR preparation message to the base station, and the base station sends an RLR waiting message in response to the RLR preparation message. And transmitting a RLR command message to the base station, and transmitting a RAB configuration message to the mobile terminal.

The RAB setup complete message includes an FNA message.

In step (g), when the RAB allocation response message message is received from the wireless controller, checking an IP address of a GGSN to which the PDP context request message is to be transmitted using the network information to be accessed, and the confirmed GGSN IP address. And transmitting a PDP context request message including the nCoA to a GGSN corresponding to the corresponding GGSN.

In the step (h), the GGSN transmits an FBU message including the nCoA to the access router, the access router creates a tunnel according to the FBU message, and then transmits an FBAck message to the GGSN. And when the FBAck message is received at the GGSN, transmitting a create PDP context response message to the SGSN and transmitting tunneled data from the access router to the mobile terminal through the generated tunnel.

The mobile terminal generates a new IP address (NCoA) to be used after handover based on the L3 information included in the measurement report message.

The first mobile communication network is one of WCDMA, TD-SCDMA, WiMAX, and CDMA, and the second mobile communication network is TD-SCDMA.

According to another aspect of the present invention, a base station for wireless section communication with a mobile terminal in a first mobile communication network including an access router, a wireless network controller for controlling the base station, is connected to the wireless network controller to serve as a mobile terminal A fast handover method to a second mobile communication network including a SGSN for providing an IP address allocation and a GGSN for accessing an Internet packet network, the method comprising: (a) L3 information including an IP address and a network prefix in the wireless network controller; Generating and broadcasting a measurement report message including L2 information; and (b) if the measurement report message is received from the wireless network controller while the mobile terminal is receiving service through the first mobile communication network, the SGSN may access the SGSN. Transmitting an activate PDP context request message including network information, (c) the activate PDP contex in the SGSN t when the request message is received, transmitting a RAB assignment request message to the radio network controller, (d) establishing a radio link with the base station according to the RAB assignment request message at the radio network controller, Transmitting a RAB setup message; (e) if a wireless link is established from the mobile terminal to the wireless network controller according to the RAB setup message, transmitting a RAB setup complete message including its own nCoA to the wireless network controller; (F) transmitting, by the radio network controller, an RAB assignment response message including the nCoA to the SGSN, and (g) transmitting, by the SGSN, a create PDP context request message including the nCoA to the GGSN. Step and (h) creating a tunnel with the access router based on the nCoA of the mobile terminal in the GGSN, and then creating a create PDP context response message to the SGSN. And transmitting the tunneled data from the access router to the mobile terminal through the generated tunnel.

The access router forwards data destined for pCoA to the nCoA via a tunnel created between the GGSNs.

As described above, according to the present invention, a mobile IP fast handover method between heterogeneous networks in which efficient handover between a TD-SCDMA network and another network can be performed through optimization between the link layer L2 and the network layer L3 is performed. Can provide.

In addition, it is possible to provide a mobile IP fast handover method between heterogeneous networks that can minimize handover time and packet loss by minimizing duplicate messages for each layer.

In addition, through inter-layer optimized handover using L2 and L3 messages together, a mobile IP fast handover method between heterogeneous networks capable of providing seamless mobility to a user based on Mobile IP service can be provided.

Details of the above-described objects and technical configurations of the present invention and the effects thereof according to the present invention will be more clearly understood by the following detailed description based on the accompanying drawings.

1 is a system for Mobile IP fast handover from another network to a TD-SCDMA network according to the present invention.

Referring to FIG. 1, in a system for mobile IP fast handover from another network to a TD-SCDMA network, the other network 110 may include a time-division synchronous CDMA (TD-SCDMA), a wireless lan (WLAN), and a world interoperability for WiMAX (WiMAX). Microwave Access ) or the like, and includes a base station 112 and an access router (AR) 114.

The access router 114 performs a gateway function for matching with the Internet, maintains current location information of the mobile terminal 100, and tunnels / routes a packet provided to the mobile terminal 100. do.

In addition, when the access router 114 receives a fast binding binding (FBU) message including a new care of address (nCoA) from a gateway GPRS support node (GGSN) 158 of the TD-SCDMA network 150, After creating tunneling with the GGSN 158, a fast binding acknowledgment message is sent to the GGSN 158.

In addition, the access router 114 creates a tunnel and forwards the packet data of the mobile terminal 100 delivered to the existing network to the GGSN 158.

Then, the mobile terminal 100 receives the tunneled data from the access router 114.

The other network 110 is a TD-SCDMA, WLAN, WiMAX, etc., but includes a base station, a controller, a switch, and the like, but the detailed description thereof will be omitted because each configuration corresponds to the conventional.

Next, the TD-SCDMA network 150 will be described.

The TD-SCDMA network 150 is a base station (node B) 152 for wireless section communication with the mobile terminal 100, a radio network controller (RNC) for controlling the base station 152 ( 154, a Serving GPRS Support Node (SGSN) 156 connected to the radio network controller 154 to provide a service to the mobile terminal 100, GGSN 158 and HA (for IP address assignment and Internet packet network access). 160).

In this case, the mobile terminal 100 is a terminal that automatically performs a session establishment procedure and transmits and receives packet data according to a session establishment request from a mobile communication network.

In addition, the mobile terminal 100 includes a data storage space for transmitting and receiving packet data. In addition, the mobile terminal 100 transmits / receives packet data to a wireless application protocol (WAP), which is a wireless Internet access protocol, a MIE (Microsoft Internet Explorer) based on HTML using an HTTP protocol, and a handheld device transport. Receives and transmits packet data to a mobile communication network using a protocol (HDPT: Handheld Device Transport Protocol) and FTP function.

In addition, the mobile terminal 100 has a multi-protocol stack and a multi-antenna that can connect to both the TD-SCDMA network 150 and another network 110 for handover between heterogeneous networks.

In addition, the mobile terminal 100 includes network information to access the SGSN 156 when a measurement report message including L3 information is received from the wireless network controller 154 while receiving the service through the other network 110. Send an activate PDP context request message.

In addition, the mobile terminal 100 generates its own new IP address (nCoA) based on the L3 information included in the measurement report message, and when the RAB configuration message is received from the wireless network controller 154, the generated The nCoA and Fast Neighbor Advertisement (FNA) messages are included in the RAB setup complete message and transmitted to the radio network controller 154.

The base station 152 performs a wireless access termination function with the mobile terminal 100 according to a wireless access standard, and transmits and receives voice, video, and data traffic, and transmits and receives a mobile terminal 100 through a transmission / reception antenna. Send and receive information.

The wireless network controller 154 is wired or wireless channel management, protocol matching of the mobile terminal 100, protocol matching of the base station. Soft handoff processing, protocol matching with Core Network, General Packet Radio Service (GPRS) access, fault management, system loading, etc. Here, GPRS is an asynchronous communication system that supports a data transfer rate of 384 Kbps, provides a multimedia mail, and maximizes the efficiency of a transmission line by packet data transmission.

In addition, the wireless network controller 100 generates and broadcasts a measurement report message including L3 information and L2 information including an IP address and a network prefix.

The Serving GPRS Support Node (SGSN) 156 is a session management, authentication, and charging function for handling mobility management, calling / incoming call processing procedures, and packet data transmission and reception of the mobile terminal 100 for GPRS services. And so on. It also has a routing processing function of packet data.

The Gateway GPRS Support Node (GGSN) 158 is a serving node of an Internet Protocol (IP) based packet network that provides a high speed packet data service for a packet data service of a GPRS, and is a mobile terminal for packet data service. IP address 100, session management, packet data routing function and provides an interface for connecting the TS-SCDMA 150 and the Internet.

In addition, the GGSN 158 determines a network providing a packet data service and an access network through an access point node (APN), and serves as a gateway to the Internet network. Here, the APN is a delimiter including an IP address assigned to the mobile terminal 100 by the GGSN 158 and may be used as a delimiter for a specific service.

The Internet network receives packet data from a plurality of connected content providers (CPs) and transmits the packet data to the radio network controller 154 and the base station 152 through the SGSN 156 and the GGSN 158.

Here, the mobile terminal 100 requests a session establishment with the SGSN 156 for packet data transmission. This process is commonly referred to as an "Activate Packet Data Protocol (PDP) Context Request".

The HA 160 maintains the current location information of the mobile terminal in the GGSN 158, tunnels / routes packets, processes address assignment, and manages mobile IP addresses.

In the present invention, for example, when a subscriber who is provided with packet service in the WCDMA network moves to the TD-SCDMA system area 150, the mobile terminal 100 supporting the WCDMA and TD-SCDMA radio technologies detects the WCDMA network. Requests a handover to the TD-SCDMA network 150.

At this time, the wireless network controller 154 of the TD-SCDMA network 150 generates and broadcasts a measurement report message including L3 information and L2 information including an IP address and a network prefix.

Then, the mobile terminal 100 generates an nCoA using the network prefix in the measurement report message, and transmits an activate PDP context request message including network information to access the SGSN 156 to provide a radio access bearer (RAB). ) Is set.

Then, when the RAB is established with the wireless network controller 154, the mobile terminal 100 transmits a RAB setup complete message including the generated nCoA to the wireless controller, and the wireless network controller 154 The RAB Assignment Response message is sent to the SGSN 156.

Then, the SGSN 156 requests the GGSN 158 to create a PDP context, and the GGSN 158 tunnels with the access router 114 based on the nCoA of the mobile terminal contained in the Create PDP Context REQ message. Create The generated tunnel minimizes the delay and loss of packets generated during handover of the mobile terminal 100.

The access router 114 forwards the packet data delivered to the existing network to the GGSN 158 to be transmitted to the mobile terminal.

2 is a flowchart illustrating a method of processing a fast handover from a first mobile communication network to a TD-SCDMA network according to the present invention.

The first mobile communication network may be one of WCDMA, WIMAX, TD-SCDMA, WLAN, and the like.

Referring to FIG. 2, the mobile station transmits a measurement report message including L2 information and L3 information from the wireless network controller to move to the TD-SCDMA network when the mobile station moves from the communication area of the first mobile communication network to the communication area of the TD-SCDMA network. Receive (S200).

The L2 information refers to a link connectivity element such as an event or a bandwidth change according to a change in signal power and error rate in the second layer (link layer), and the L3 information includes an IP address, Network prefix and the like.

That is, the wireless network controller delivers cell information of the current network to the mobile terminal through a measurement report message. At this time, the mobile network controller not only transmits cell information but also L3 information of the GGSN to which the mobile network belongs. Router Solicitation / Advertisement procedure can be pre-processed to reduce handover delay more effectively.

After performing the step S200, the mobile terminal transmits an activate PDP context request message including the network information to be accessed to the SGSN (S202). The network information to be accessed includes NSAPI (Network layer Service Access Point Identifier), TI, PDP Type, PDP Address, Access Point Name, QoS Requested, PDP Configuration Options, and the like.

Upon receiving the activate PDP context request message, the SGSN transmits an RAB allocation request message to the radio network controller (S204).

Then, the radio network controller changes the radio link with the base station according to the RAB allocation request message (S206), and transmits a RAB establishment message to the mobile station (S208). That is, when the RAB allocation request message is received, the radio network controller transmits a radio link reconfiguration message to the base station, and when a radio link reconfiguration ready message is received from the base station, The radio link change command message is transmitted to the base station.

The radio network controller then transmits a radio bearer setup message to the mobile station.

The mobile terminal receiving the RAB configuration message establishes a radio link to the radio network controller according to the RAB configuration message and transmits a RAB configuration complete message to the radio network controller (S210).

In this case, the RAB setup complete message includes a new IP address (nCoA) generated for use after handover based on the L3 information included in the measurement report message.

Accordingly, the mobile station can reduce the handover delay time by transmitting a fast careover address (FNA) procedure of Fast Handovers by transmitting a new care of address (nCoA) of the mobile station together with the RAB configuration completion message.

The wireless network controller receiving the RAB setup complete message from the mobile terminal by performing the step S210 transmits a RAB assignment response message including nCoA included in the RAB setup complete message to the SGSN (S212).

Then, the SGSN transmits a create PDP context request message including the nCoA to the GGSN to establish a session with the GGSN (S214).

That is, the SGSN checks the IP address of the GGSN to which the Create PDP context request message will be transmitted using the network information to be accessed included in the activate PDP context request message to connect its PDP context to the PGS context of the GGSN.

Then, the SGSN transmits a Create PDP context request message including the nCoA to the GGSN corresponding to the identified GGSN IP address.

Then, the GGSN transmits a Fast Binding Update (FBU) message including the nCoA to the access router to determine whether a tunnel is formed with the access router based on the nCoA contained in the Create PDP Context request message (S216).

The access router checks whether a tunnel is formed for the nCoA included in the FBU message, and if a tunnel is formed, a Fast Binding Acknoweldgement (FBAck) indicating that tunnel setup is completed and preparation for fast handover is completed. The message is transmitted to the GGSN (S218).

When a tunnel is created between the access router and the GGSN, the access router tunnels all packets destined for the PCoA to the NCoA. Then, the tunneled data is transmitted to the mobile terminal through the GGSN.

When the S218 is performed, the GGSN generates a create PDP context response message and transmits it to the SGSN (S230). The GGSN confirms the connection of the PDP context through the Create PDP Context response message.

When the S230 is performed, the SGSN transmits an Activate PDP Context setting completion message to the mobile terminal (S232).

The mobile station receiving the activate PDP context response message through S232 receives the data packet forwarded by the access router from the GGSN (S234 and S236).

That is, the data of the mobile terminal is forwarded to the GGSN of the TD-SCDMA network through the generated tunnel and transferred.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, the mobile IP high speed handover method between heterogeneous networks according to the present invention is suitable for a technology for providing seamless mobility to a user based on Mobile IP service by performing an efficient handover between heterogeneous networks.

1 is a system for Mobile IP handover from another network to a TD-SCDMA network according to the present invention.

2 is a flowchart illustrating a method of processing handover from a first mobile communication network to a TD-SCDMA network according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: mobile terminal 112, 152: base station

114: access router (AR) 154: wireless network controller

156: SGSN 158: GGSN

160: HA

Claims (13)

A base station for wireless section communication with a mobile terminal in a first mobile communication network including an access router, a wireless network controller for controlling the base station, SGSN connected to the wireless network controller and providing a service to the mobile terminal, IP address allocation A fast handover method to a second mobile communication network including a GGSN for accessing an internet packet network, (a) If the measurement report message including the L3 information is received from the wireless network controller while the mobile terminal is receiving the service through the first mobile communication network, the mobile terminal activates an activate PDP context request message including network information to access the SGSN. Transmitting; (b) if the activate PDP context request message is received at the SGSN, transmitting a RAB assignment request message to the radio network controller; (c) establishing a radio link with the base station according to the RAB allocation request message in the radio network controller and transmitting a RAB establishment message to the mobile terminal; (d) if the mobile terminal establishes a radio link to the radio network controller according to the RAB configuration message, transmitting a RAB configuration complete message including its own nCoA to the radio network controller; (e) transmitting, at the radio network controller, an RAB assignment response message including the nCoA to the SGSN; (f) transmitting, at the SGSN, a create PDP context request message including the nCoA to the GGSN; and (g) the GGSN creates a tunnel with the access router based on the nCoA of the mobile terminal, transmits a create PDP context response message to the SGSN, and transmits the tunneled data from the access router through the generated tunnel. Transmitting to the mobile terminal Mobile IP high speed handover method between heterogeneous manganese comprising a. The method of claim 1, The measurement report message is a mobile IP fast handover method between heterogeneous networks, characterized in that the L3 information and L2 information including the IP address, network prefix. The method of claim 1, The network information to be accessed includes at least one of NSAPI, TI, PDP Type, PDP Address, Access Point Name, QoS Requested, and PDP Configuration Options. The method of claim 1, Step (c) is, When the RAB assignment request message is received at the radio network controller, transmitting an RLR preparation message to the base station; Transmitting, by the base station, an RLR waiting message to the radio network controller in response to the RLR ready message; and And transmitting, by the radio network controller, an RLR command message to the base station, and transmitting a RAB setup message to the mobile terminal. The method of claim 1, The RAB setup complete message is a mobile IP fast handover method between heterogeneous networks, characterized in that it comprises a FNA message. The method of claim 1, Step (f), When the RAB assignment response message is received from the wireless controller, checking an IP address of a GGSN to which the PDP context request message is to be transmitted using the network information to be accessed; And a method for transmitting a PDP context request message including the nCoA to a GGSN corresponding to the identified GGSN IP address. The method of claim 1, In step (g), Transmitting, at the GGSN, an FBU message including the nCoA to the access router; Creating a tunnel according to the FBU message in the access router and transmitting an FBAck message to the GGSN; and When the FBAck message is received in the GGSN, transmitting a create PDP context response message to the SGSN and transmitting tunneled data from the access router to the mobile terminal through the generated tunnel. Mobile IP fast handover method between heterogeneous manganese. The method of claim 1, The mobile terminal generates a new IP address (New Care of Address (NCoA)) for use after handover based on L3 information included in the measurement report message. The method of claim 1, The first mobile communication network is one of WCDMA, TD-SCDMA, WiMAX, CDMA mobile IP high speed handover between heterogeneous networks. The method of claim 1, The second mobile communication network is a TD-SCDMA mobile IP high speed handover between heterogeneous networks. A base station for wireless section communication with a mobile terminal in a first mobile communication network including an access router, a wireless network controller for controlling the base station, SGSN connected to the wireless network controller and providing a service to the mobile terminal, IP address allocation A fast handover method to a second mobile communication network including a GGSN for accessing an internet packet network, (a) generating and broadcasting a measurement report message including L3 information and L2 information including an IP address and a network prefix in the wireless network controller; (b) when the mobile terminal receives a measurement report message from the wireless network controller while receiving a service through the first mobile communication network, transmitting an activate PDP context request message including network information to access the SGSN; (c) if the activate PDP context request message is received at the SGSN, transmitting a RAB assignment request message to the radio network controller; (d) establishing a radio link with the base station according to the RAB allocation request message in the radio network controller and transmitting a RAB establishment message to the mobile terminal; (e) when the mobile terminal establishes a radio link to the radio network controller according to the RAB configuration message, transmitting a RAB configuration complete message including its own nCoA to the radio network controller; (f) transmitting, at the radio network controller, an RAB assignment response message including the nCoA to the SGSN; (g) transmitting, at the SGSN, a create PDP context request message including the nCoA to the GGSN; and (h) After the GGSN creates a tunnel with the access router based on the nCoA of the mobile terminal, transmits a create PDP context response message to the SGSN and transmits the tunneled data from the access router through the generated tunnel. Transmitting to the mobile terminal Mobile IP high speed handover method between heterogeneous manganese comprising a. The method of claim 11, The mobile terminal generates nCoA using an IP address and a network prefix included in the measurement report message. The method of claim 11, And the access router forwards data destined for pCoA to the nCoA through a tunnel created between the GGSNs.

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