KR100623291B1 - Handoff system for relating cdma2000 with portable internet and method therof - Google Patents

Abstract

Disclosed are a system for handoff between a CDMA 2000 network and a portable Internet network, and a handoff method using the same. The method may include: a) performing an initial access to an access point (AP) of a mobile Internet through a channel accessible by the mobile terminal; b) providing a PANID (Previous Access Network ID) value to the portable Internet base station 130; c) determining, by a portable Internet access control router (ACR), whether the access request of the mobile terminal is a handoff request or an outgoing request through the access network ID (PANID); d) If it is determined in step c) that the mobile terminal is not handoff, perform wireless channel assignment and initial access procedure, and in case of handoff of the mobile terminal, provide a wireless channel from the base station of the mobile Internet. Receiving step; e) recognizing, from the ACR, the IP address of the PDSN of the previous network for the mobile terminal; And f) transmitting IP address information of the PDSN to an access interwork gateway (AIG) to relay traffic between the mobile station and the wireless Internet through the PP interface with the PDSN of the previous access network of the mobile station. It is composed.

Accordingly, the present invention allows the handoff to be faithfully implemented in integrating heterogeneous network systems by maintaining the previous session of the mobile terminal as the inter-network handoff is performed. In addition, by implementing an effective heterogeneous network interworking service with the portable Internet network through the minimum modification of the CDMA2000 infrastructure, it is possible to grasp the user service quality improvement and mobile terminal's movement pattern through efficient interworking between the CDMA2000 network and the portable Internet network. A process for enemy handoff can be performed to support seamless and fast handoff.

CDMA2000, Mobile Internet, Handoff, AAA Server, AIG, ACR, MAC, LAC, PPP

Description

HANDOFF SYSTEM FOR RELATING CDMA2000 WITH PORTABLE INTERNET AND METHOD THEROF}

1 is a block diagram showing a connection between heterogeneous networks according to the present invention.

2 is a block diagram showing a protocol stack of a mobile terminal applied to the present invention.

3 is a flowchart illustrating a CDMA2000 access procedure of a mobile terminal according to an operation of the present invention.

4 is a flowchart illustrating a handoff process of a mobile terminal according to the operation of the present invention.

<Explanation of symbols for main drawings>

103: AAA server of CDMA2000 105: Packet data serving node (PDSN)

107: Home Agent (HA) 109: CDMA2000 Router

111: mobile Internet base station router 113: mobile Internet base station AAA server

115: AIG (Access Interwork Gateway) 121: CDMA2000 base station

130: mobile Internet base station 150: Internet network

The present invention relates to an integrated system of a 3rd generation (3G) network and a wireless LAN network, and more particularly, to a CD in a multi-access system environment in which a CDM (2000) network and a portable Internet (PI) coexist. The present invention relates to a handoff system between a CDA 2000 and a portable Internet network capable of effectively supporting a handoff from a portable Internet network to a mobile phone by minimizing a change in a CDMA2000 network and a handoff method using the same. .

In general, users require various services irrespective of network type, and various access systems suitable for specific services have been made. However, in order for a user to receive the best service in a given environment, it is essential to effectively link various access systems. A representative study on interworking between heterogeneous networks is the development of interworking service standards for 3G mobile communication and WLAN.

However, each of these networks has evolved independently and uses different specifications and standards. Therefore, in order to interwork each network, various matters such as architecture, protocol structure, mobility, quality of service, authentication, security, billing, etc. must be considered, and modification and supplementation of each matter must be accompanied. The 3G-WLAN interworking method is classified into a loosely coupled and tightly coupled scheme.

In the loosely coupled system, the 3G network and the WLAN user are independently authenticated with each other, and the charging or mobility support management policy is maintained.

However, in order to support seamless communication, it must have one unified user information and therefore require interaction between two different networks. For example, an AAA server in a 3G network should be able to retrieve user information such as accounting records from a WLAN gateway. In addition, the introduction of the Mobile IP function is required to support mobility between networks, and 3G network operators need to store WLAN accounting records, set a single policy for billing, and establish 3G network and WLAN billing. Therefore, the Loosely coupled integration method has a problem that if a service provider has only a roaming contract without a billing contract, users must subscribe to both services but can use both networks, and billing must be paid twice. .

On the other hand, the tightly coupled coupling scheme has a structure in which a 3G core network and a WLAN are directly integrated. This is a form in which the WLAN is directly connected to the equipment of the 3G network (GGSN in the UMTS, PDSN in the CDMA2000), the WLAN is composed of one 3G access network to the 3G core network. WLAN gateways should implement all 3G protocols along with Internet protocols, and also implement 3G protocol stacks on terminals as well as Internet protocol stacks to change the physical layer when using both stacks simultaneously or when handoff between two networks. The process is necessary. All data sent by the terminals in the WLAN is sent through the 3G core network. In this way, different networks perform the same processing for authentication, signal strength, transmission, and billing.

However, since WLANs are directly connected to 3G core networks, the same service provider must service both networks or contracts must be made in advance. And since WLAN traffic always uses the 3G core network, it must be designed to handle the increased traffic in network components such as PDSN and GGSN. In addition, significant additional costs are required because additional 3G protocol stacks must be implemented in the WLAN interface used for all terminals.

As a result, the Loosely Coupled interworking scheme described above has a problem of high data loss and delay time during the handoff process, and the Tightly Coupled interworking scheme requires traffic re-engineering of the mobile telephone network. There is a problem that integration must be made except for access.

The present invention was created to solve the above problems, and an object of the present invention is a method capable of supporting both the advantages of the Loosely Coupled interworking scheme and the Tightly Coupled interworking scheme, and is based on the Simple IP service. The present invention provides a handoff system between a CDA 2000 and a portable Internet network and a handoff method using the same.

Another object of the present invention is to add an AIG (Access System Inter-working Gateway) node for interconnecting a mobile telephone network and a mobile Internet network to an existing network, thereby reducing delays due to handoff and traffic of the mobile telephone network. The present invention provides a handoff system between a CD 2000 and a portable Internet network and a handoff method using the same.

According to an aspect of the present invention for achieving the above object, there is provided a handoff system between the CD 2000 and the portable Internet network according to the first aspect; The system includes a CDMA2000 network comprising an AAA (Authentication, Authorization, Accounting) server, a packet data serving node (PDSN), a home agent, and a router; and a CDMA2000 base station connected to the CDMA2000 network; And a portable Internet network connected to a router of the CDMA2000 network, comprising: a heterogeneous network of a plurality of portable Internet base stations and a portable Internet network and a CDMA2000 network for accessing a mobile terminal. A mobile Internet base station comprising an access control router for performing a network connection between the mobile station and an AAA server connected to the access control router to perform authentication, authorization, and charging of a mobile terminal connected from another network; And a connection between the portable Internet base station and a packet data serving node (PDSN) of the CDMA2000 network, for handoff between the packet data serving node (PDSN) and an access control router (ACR) of the portable Internet base station (PI RAN). PP Interface Includes AIG (Access Interwork Gateway) for PPP setup and default PPP for relay and mobile terminals.
In the above configuration, the mobile terminal has a protocol stack in a dual mode.
In the above configuration, the dual-mode protocol stack may include: CDMA2000 and the physical layers of the portable Internet (CDMA2000 Phy, PI Phy), each of which consists of functional channels for providing a radio link; A media access layer (MAC, MAC) of CDMA2000 and portable Internet for using a shared protocol of a radio resource medium to enable one access point and a plurality of terminals to communicate at the same time; It is responsible for establishing, managing, and terminating logical links, and link access layer (LAC / RLP, LAC) of CDMA2000 and portable Internet to establish one logical link for one call requested by the user. ); PPP layer defining a protocol between access points for performing handoff of a mobile station by setting a default value for transition between heterogeneous networks when performing a logical link for call establishment of the CDMA2000 and the portable Internet. to Point Protocol); And an internet protocol layer (IP layer) and an interface layer (interface selection layer) for generating and transmitting a message for call connection control so that messages for establishing an actual call can be transmitted and received between the mobile station and the network. Is done.
In the above configuration, the AIG retains the PPP function for the mobile terminal and, when handing off from the CDMA2000 network to the portable Internet network, substitutes for previous PPP processing for the mobile terminal.
In the above configuration, the AIG maintains the continuity of the PPP by keeping the option parameter of the previous PPP for the mobile terminal at a default value.
In the above configuration, when the mobile terminal accesses the CDMA2000 network from the CDMA2000 network, the mobile station performs a call diagram with the portable Internet base station including information on a previous access network.
In the above configuration, the information on the previous access network is a heterogeneous network using a PANID (previous access network ID) in a Point Coordination Function (PCF) located in a base station of the CDMA2000 network or a packet data serving node (PDSN) of the CDMA2000 network. It is identification information for and determines whether the current initial access attempt is a handoff or a new call from the heterogeneous network based on the identification information for the heterogeneous network.
According to another aspect of the present invention, there is provided a method for handoff between heterogeneous networks using a handoff system between a CD 2000 and a portable Internet network. The method includes: a) accessing an AP through a channel accessible by a mobile terminal; Performing Initial Access with a pointer); b) providing a PANID (Previous Access Network ID) value to the portable Internet base station; c) determining whether to handoff the mobile station from an access control router (ACR) of a portable Internet base station through the access network ID (PANID); d) performing the initial internet access procedure when the mobile terminal is not handoff as a result of the determination of step (c), and receiving a wireless channel from the base station of the portable internet when the mobile terminal is handoff; e) recognizing, from the ACR, the IP address of the PDSN of the previous network for the mobile terminal; And f) transmitting IP address information of the PDSN to an access interwork gateway (AIG) and relaying the traffic between the mobile network and the heterogeneous network between the mobile terminal and the wireless Internet by relaying the PDSN of the previous access network of the mobile terminal through a PP interface. It includes.
In the above configuration, the step (e) provides the PANID received from the mobile terminal and the Call Access Network ID (CANID) of the portable Internet base station to the ACR, and the ACR uses the PANID information to provide the mobile terminal. It knows the IP of the PDSN of the network which stayed before.
In the above configuration, the AIG generates a default PPP value according to the transition between heterogeneous networks, and sets a PPP option of the mobile terminal.
In the above configuration, the AIG maintains the continuity of the PPP by keeping the option parameter of the previous PPP for the mobile terminal at a default value.

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Hereinafter, the CDA 2000 and the portable Internet manganese handoff system according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, FIG. 1 is a block diagram showing an interworking network between a CD 2000 network and a portable Internet network according to the present invention.

As shown in the figure, AAA (Authentication, Authorization, Accounting) server is responsible for authentication, authorization, and accounting functions for packet data networks, and performs functions such as authentication, authorization, and charging for PPP and Mobile IP connections. 103; Establishment, maintenance, and termination of Point-to-Point Protocol (PPP) sessions to subscriber terminals for packet data service, and logical link establishment of RN (Radio Network) through Mobile IP and basic IP service RP (Radio Packet) interface A packet data serving node (PDSN) for performing maintenance, termination, and initialization of the mobile terminal and the AAA server 103, reception of service parameters of the mobile client from the AAA server 103, and packet routing to an external packet data network. 105); A Home Agent (107) for performing a mobile IP registration process from a mobile terminal to a node defined for application of Mobile IP; The CD2000 network configured as a router (Router: 109) for performing routing with the Internet network 150, routing packets to the mobile terminal, and performing a communication connection with the AAA server 103 for user authentication. CDMA2000 Network: 100; A CDMA 200 base station (CDMA 2000 RAN-Radio Access Network) connected to the CD2000 network 100 and having a PCF (Point Coodination Function: 121), a BSC, a BSS, etc. to perform a call connection with a mobile terminal: 120); An access control router (111) for performing a network connection between a plurality of access points (APs) and a portable Internet network (150) and a CDMA2000 network (100) for accessing the mobile terminal; And a mobile Internet base station (PI RAN: Portable Internet Radio Access Network: 130) configured to be connected to the access control router 111 and configured to perform authentication, authorization, and charging of a mobile terminal connected from another network. ; And a connection control router connected between the mobile Internet base station (PI RAN) 130 and the packet data serving node 105 and connecting the packet data serving node (PDSN) 105 and the mobile internet base station (PI RAN: 130). PP Interface for handoff between ACR: 111), PPP setup for mobile terminal and AIG (Access Interwork Gateway: 115) for generating Default PPP.

Meanwhile, a protocol stack of a mobile terminal for performing handoff of the mobile terminal according to the integration of the CDMA2000 network 100 and the portable internet network 150 is shown in FIG. 2. Dual Stack for CDMA2000 service and PI service. Accordingly, the dual-mode protocol stack of a mobile terminal provides a broadcast control channel (BCCH), a common control channel (CCCH), and a user packet (UPCH) to provide a radio link configured with a specific throughput and data quality. A physical layer (CDMA2000 Phy, PI Phy) of the CDMA2000 and the portable Internet including functional channels such as a channel, an associated control channel (ACCH), a dedicated control channel (DCCH), a traffic channel (TCH), and the like; A media access layer (MAC, MAC) of CDMA2000 and portable Internet for using a shared protocol of a radio resource medium, that is, Media Access Control (MAC), so that one access point and a plurality of terminals can communicate at the same time; It is responsible for establishing, managing, and terminating logical links, and link access layer (LAC / RLP, LAC) of CDMA2000 and portable Internet for establishing one logical link for one call requested by the user. )and; PPP layer defining a protocol between access points for performing handoff of a mobile station by setting a default value for transition between heterogeneous networks when performing a logical link for call establishment of the CDMA2000 and the portable Internet ( Point to Point Protocol); Messages for establishing an actual call between the mobile terminal and the network are composed of an Internet Protocol layer (IP layer) and an interface layer (Interface Selection Layer) for generating and transmitting a message for call connection control so that transmission and reception are performed. .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 3 is a flowchart illustrating a CDMA2000 transmission process before performing a handoff between heterogeneous networks, and FIG. 4 is a flowchart illustrating a handoff between heterogeneous networks from a CDMA2000 network to a portable Internet network.

As shown here, the mobile terminal having the dual mode protocol stack transmits an origination message to the CDMA2000 to obtain a traffic channel. Here, the base station network 120 and the mobile station establishes a wireless traffic channel, and the BSS of the base station network 120 transmits an A8-setup-A9 message to the PCF 121 to establish an A8 / A9 connection. The PCF 121 sends an A11-Registration Request message to the PDSN 105 via the A10 connection, and the PDSN 105 returns an A11-Registration Reply message as an indication of approval.

Here, when establishing the A10 connection, the PCF 121 establishes an A8 connection and transmits an A9-Connect-A8 message. When the connection procedure is completed, the mobile station performs PPP configuration with the PDSN 105. The PDSN 105 requests user authentication from the AAA server 103. The AAA server 103 determines whether a 3G network subscriber, i.e., a mobile terminal using a CDMA2000 network, is registered with the AAA server 103. When the user authentication of the AAA server 103 is completed, data is transmitted and received. This is because the 3G network subscriber station moves to the mobile Internet service area and uses the mobile Internet, or when the mobile terminal in the mobile Internet service area tries to access the 3G network, whether the initial connection attempt of two different heterogeneous networks is handoff. Determine the cognition. Therefore, the PCF 121 or the PDSN 105 checks the previous access network using a PANID (previous access network ID) to perform subscriber authentication between heterogeneous networks.

On the other hand, when performing a handoff for heterogeneous network transition from the mobile terminal CDMA2000 network to the portable Internet network 150, as shown in Figure 4, the mobile terminal for handoff for packet data service to the portable Internet Initial access is performed to an access point (AP) through an accessible channel. The mobile terminal provides a PANID (Previous Access Network ID) value to the portable Internet base station 130, and provides a PANID to an air interface of the portable Internet.

Through the access network ID (PANID), the ACR 111 of the portable Internet can recognize from which network the mobile terminal has handed off, from which the mobile terminal can establish a wireless channel from the base station 130 of the portable internet. Get The mobile Internet base station 130 sends a registration request message to the ACR 111, and the message includes a PANID provided from the mobile terminal and its CANID (Call Access Network ID). The ACR 111 uses the PANID information to recognize the IP of the Anchor PDSN of the network where the mobile station previously stayed.

In order to connect the ACR 111 identifying the handoff in the CDMA2000 network with the PDSN 105 having the corresponding IP, the ACR 111 includes the IP information of the PDSN 105 in the PP Registration Request message. It passes to the AIG 115. The AIG 115 attempts to find and connect to the PDSN 105 to which the mobile terminal previously belongs, and the AIG 115 relays between the ACR 111 and the PDSN 105 through a PP interface. . Accordingly, the PDSN 105 sends a P-P Registration Reply message to the AIG 115 as a result of the connection confirmation.

The AIG 115 transmits a P-P Registration Reply message to the ACR 111 in response to the connection confirmation. In this case, since the mobile Internet does not use a separate PPP, the AIG 111 generates a PPP setting and generates a default PPP to perform PPP encoding / decoding. In this case, the mobile terminal also uses only the basic PPP option without using an additional PPP option. Conduct. Accordingly, the PDSN 105 provides a heterogeneous network connection between the mobile terminal and the Internet by routing packets of the mobile terminal, and the mobile terminal can transmit and receive traffic to the Internet through the AP-ACR-AIG-PDSN.

What has been described above is only an embodiment of a handoff system between a CD 2000 and a portable Internet network according to the present invention and a handoff method using the same, and the present invention is not limited to the above-described embodiment, and the following claims As claimed in the present invention without departing from the gist of the present invention, any person having ordinary knowledge in the field of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, the handoff system between the CDA 2000 and the portable Internet network according to the present invention recognizes the CDMA2000 network service area of the previously connected state of the mobile terminal that is currently connected, and exchanges information between each network AAA server. After authentication, handoff can be faithfully performed in integrating heterogeneous network systems by maintaining the previous session of the mobile terminal as the handoff between networks is performed.

In addition, by implementing an effective heterogeneous network interworking service with the mobile Internet network through the minimum modification of the CDMA2000 infrastructure, the user service quality improvement and mobile terminal's movement pattern through the efficient interworking between the CDMA2000 network and the mobile internet network are identified. A process for enemy handoff can be performed to support seamless and fast handoff.

Claims (11)

A CDMA2000 network comprising an AAA (Authentication, Authorization, Accounting) server, a packet data serving node (PDSN), a home agent, and a router; and a CDMA2000 base station connected to the CDMA2000 network; And a portable internet network connected to a router of the CDMA2000 network. Access control router for accessing a heterogeneous network between a plurality of portable Internet base stations and a mobile internet network and a CDMA2000 network connected to a mobile terminal, and the access control router to connect from another network. A mobile Internet base station comprising an AAA server for performing authentication, authorization, and charging of the mobile terminal; And A PP for handoff between the portable data base station and a packet data serving node (PDSN) of the CDMA2000 network and between the packet data serving node (PDSN) and a connection control router (ACR) of the portable Internet base station (PI RAN). A handoff system between a CDA 2000 and a portable Internet network, comprising an AIG (Access Interwork Gateway) for generating PPP settings and a default PPP for an interface relay and a mobile terminal. The method of claim 1, wherein the mobile terminal, A handoff system between a CDA 2000 and a portable Internet network characterized by having a dual mode protocol stack. The method of claim 2, wherein the dual mode protocol stack, CDMA2000 consisting of functional channels for providing a radio link and each physical layer of the portable Internet (CDMA2000 Phy, PI Phy); A media access layer (MAC, MAC) of CDMA2000 and portable Internet for using a shared protocol of a radio resource medium to enable one access point and a plurality of terminals to communicate at the same time; It is responsible for establishing, managing, and terminating logical links, and link access layer (LAC / RLP, LAC) of CDMA2000 and portable Internet to establish one logical link for one call requested by the user. ); PPP layer defining a protocol between access points for performing handoff of a mobile station by setting a default value for transition between heterogeneous networks when performing a logical link for call establishment of the CDMA2000 and the portable Internet. to Point Protocol); And Internet Protocol Layer (IP Layer) and Interface Layer (Interface Selection Layer) for generating and transmitting messages for call connection control so that messages for establishing actual calls can be transmitted and received between the mobile station and the network. Handoff system between the CD 2000 and the portable Internet network, characterized in that. The method according to claim 1, wherein the AIG is A handset between the CDA 2000 and the portable Internet network, which has a PPP function for the mobile terminal and, when handing off from the CDMA2000 network to the portable Internet network, substitutes the previous PPP processing for the mobile terminal. Off system. The method according to claim 4, wherein the AIG is, Handoff system between the CD 2000 and the portable Internet network, characterized in that to maintain the continuity of the PPP by maintaining the option parameter of the previous PPP for the mobile terminal to the default value (Default). The method of claim 1, wherein the mobile terminal, When the CDMA2000 network is connected to the portable Internet network, the handoff system between the CD 2000 and the portable Internet network, characterized in that including the information about the previous access network and the mobile Internet base station. The method of claim 6, wherein the information about the previous access network, Identification information on a heterogeneous network using a PANID (previous access network ID) in a PCF (Point Coordination Function) located in a base station of the CDMA2000 network or a packet data serving node (PDSN) of the CDMA2000 network, and identification information of the heterogeneous network. Handoff system between the CDA 2000 and the portable Internet network characterized in that it determines whether the current initial connection attempt is a handoff or a new call from the heterogeneous network. In a handoff method between heterogeneous networks using a handoff system between a CD 2000 and a portable internet network, a) performing initial access to an access point (AP) through a channel accessible by the mobile terminal; b) providing a PANID (Previous Access Network ID) value to the portable Internet base station; c) determining whether to handoff the mobile station from an access control router (ACR) of a portable Internet base station through the access network ID (PANID); d) performing the initial internet access procedure when the mobile terminal is not handoff as a result of the determination of step (c), and receiving a wireless channel from the base station of the portable internet when the mobile terminal is handoff; e) recognizing, from the ACR, the IP address of the PDSN of the previous network for the mobile terminal; And f) transmitting IP address information of the PDSN to an access interwork gateway (AIG) and relaying the PDSN of the previous access network of the mobile terminal through a PP interface to transmit and receive traffic between heterogeneous networks between the mobile terminal and the wireless Internet. Handoff method between the CD 2000 and the portable Internet network comprising a. The method of claim 8, wherein step (e) PANID provided from the mobile terminal and the CANID (Call Access Network ID) of the portable Internet base station are provided to the ACR, and the ACR recognizes the IP of the PDSN of the network where the mobile terminal has previously stayed using the PANID information. Handoff method between the CD 2000 and the portable Internet network, characterized in that. The method of claim 8, wherein the AIG, And generating a default PPP value according to a transition between heterogeneous networks, and setting a PPP option of the mobile terminal. The method of claim 10, wherein the AIG is, And a continuity of the PPP by maintaining option parameters of the previous PPP for the mobile terminal at a default value.

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