KR20020076518A - Wireless Access Gateway Architecture Method For Access To IP Based Core NetworkIn IMT-2000 Mobile Network - Google Patents

Abstract

PURPOSE: A wireless access gateway device for accessing an IP packet-based core network in an IMT-2000 mobile communication network is provided to differentiate voices based on lines from voices based on packets, and to integrate various wireless Internet packet services into an IP-based packet service, thereby reducing service cost and implementing an efficient packet data service. CONSTITUTION: The first gateway performs a wireless data service with an IP-based core network and more than a 3 or a 4 generation wireless access network. The second gateway performs a wireless data service with the IP-based core network and 2/2.5 generation wireless access networks. The wireless data services are carried out by an IP-based packet service. A protocol conversion, a protocol interworking, and an interface are performed through an API(Application Program Interface), to carry out functions of the first and the second gateway. The first gateway comprises as follows. The first access unit mounts a protocol stack corresponding to the wireless access network for accessing more than 3 generation wireless access networks. The first access gateway functional unit mounts a gateway protocol stack for communicating with the IP-based core network, by exchanging information packets with the first access unit or the second gateway.

Description

Wireless access gateway device for IP packet-based core network access in IMT-2000 mobile communication network, method and wireless data service system using same {Wireless Access Gateway Architecture Method For Access To IP Based Core Network In IMT-2000 Mobile Network}

The present invention relates to a gateway device, and more particularly, to a packet provided by a subscriber of a second generation CDMA mobile communication network, a second generation PCS mobile communication network, and a third generation synchronous CDMA2000 mobile communication network in a third generation IMT-2000 IP based core network. The present invention relates to a wireless access gateway device structure and protocol implementation method for IP packet-based core network access in an IMT-2000 mobile communication network capable of providing services and access to all Internet networks, and a wireless data service system using the same.

Currently, the third generation mobile communication network, IMT-2000, is implemented to provide packet service through a radio access network and a core network. Also, second generation and 2.5 generation CDMA and PCS wireless communication networks are WAP (Wireless Application). Protocol Provides packet service such as wireless internet through protocol.

In addition, it is determined that the third generation and fourth generation mobile communication networks will evolve to accommodate existing packet services, that is, provide backward compatibility. Accordingly, there is a need for network components that require efficient management and processing of second generation, 2.5 generation and third generation packet traffic.

In addition, all existing wired and wireless networks are expected to be switched to packet-switched networks by causing inefficiency, while simultaneously providing services provided by IP-based packet-switched networks to third-generation mobile subscribers and third-party subscribers. There is a need for a network component that enables efficient service for 2 / 2.5 household subscribers.

On the other hand, in the case of the existing 2nd generation, 2.5th generation and 3rd generation subscribers, voice is serviced in a wireless access network in a circuit manner, and access to other networks such as PSTN is made through an interworking function. As the core network is composed of IP-based packet switched networks, a gateway for converting voice into packet-based traffic is required.

That is, the access gateway currently being standardized in the 3GPP2 All IP ad hoc group, as shown in Figure 1, is a functional element that provides access to the IP-based network and the third generation mobile communication network and Bluetooth (Bluetooth) access network, To this end, the access gateway is composed of a foreign agent, a function of VoIP and mobile IP.

Meanwhile, a specific gateway protocol stack applied to the access gateway device as shown in FIG. 1 has not been standardized yet.

The conventional access gateway as shown in FIG. 1 is known to provide the following functions.

1) Handoff support at the access gateway.

2) Support link layer handoff function within the same access network.

3) Support interface function of 3rd generation access network function, that is, interface function with BSC / RNC and PCF function.

4) Support for Mobile Agent's External Agent (IPv4) and Attendant (IPv6).

5) Function from the packet-based terminal to the link layer end point of the access gateway, that is, PPP termination function.

6) Perform the transmission function of the bearer stream (provides circuit and packet switching function of signal and voice data).

7) Provide access to network layer registration and authentication for Mobile Stations.

8) Communicate with AAA for user authentication, access authorization to the core network, and accounting.

9) Forward policy decision information to access network.

10) Policy traffic to or from the mobile station.

11) Collect accounting information from the access network and forward it to the AAA.

12) Intercepts and processes QoS requests from mobile stations and delivers them to QoS-related functional elements of the core network.

13) Supports 3GPP2 P.S0001 specification for TIA / EIA-41 domain.

14) Interface with Bluetooth access network and IP-based core network.

15) Interface with other cable and xDSL access network and IP based core network.

However, although the existing access gateway performs the functions as listed above, in actual mobile communication networks of Korea, there are quite a few subscribers of the existing 2nd and 2.5th generation mobile communication networks, and they are currently providing wireless internet services. The protocol is also wrong in the way that all operators are different, and therefore, the service sharing between each service is impossible in the customer position provided with services from different operators, so inefficient services are provided as a whole.

In addition, there are limitations of Internet services. In addition, the existing wireless Internet packet network is not configured based on IP, and there is a disadvantage in that it is inefficient in switching function.

The present invention has an acceptable structure according to the current and future requirements as described above, and the access gateway of the existing third generation IMT-2000 All IP network so that all future packet services to be evolved can be processed as one radio function element. It is an object of the present invention to provide an access gateway device capable of interworking with a wireless Internet service currently being serviced in 2nd generation and 2.5th generation and providing a roaming service to another network, a method thereof, and a wireless data service system using the gateway. It is done.

1 is a schematic structural diagram of a conventional access gateway supporting access between a third generation mobile communication network and an IP-based core network in an IMT-2000 mobile communication network;

2 is a schematic structural diagram of a wireless access gateway according to the present invention; And

3 is a schematic illustration of a protocol stack applied to a radio access gateway according to the present invention.

According to an access gateway according to the present invention, there is provided an access gateway, comprising: a first gateway unit for performing a wireless data service between an IP-based core network and a 3rd generation or 4th generation or more wireless access network; And a second gateway unit configured to perform a wireless data service between the IP based core network and a second generation and 2.5 generation wireless access network, wherein the wireless data service comprises an IP based packet service. Protocol conversion, inter-protocol interworking, and interface for performing each function are made through API functions.

In addition, according to a preferred embodiment of the present invention, there is provided a wireless data service system for performing a wireless data service between the IP-based core network and the second generation or more wireless access network, the system, the IP-based core network and the second generation or more wireless The wireless data service with the access network is performed using the access gateway according to claim 1.

Further, according to a further suitable embodiment of the present invention, there is provided a wireless data service method through an access gateway device for wireless data service between an IP-based core network and a second generation or more wireless access network, the method comprising: An access gateway equipped with a corresponding gateway protocol stack for connecting to a corresponding wireless access network through a connection unit having a communication protocol stack corresponding to the communication protocol, for exchanging and processing the information packet with the access means, and for communicating with the IP-based core network. It communicates with the IP-based core network through the means, and the protocol processing and the inter-stack stack processing in the access gateway means is performed through an API function.

Further advantages and features of the present invention will now be described in detail by way of example only with reference to the accompanying drawings. The following description is for the overall understanding of the present invention, and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

In the next generation IP-based mobile communication network, the access gateway device according to the present invention can provide a service provided by an IP-based core network to users of second-generation, 2.5-generation, and third-generation line-based wireless access networks, which are existing mobile communication networks. By supporting the functions of the gateway such as bearer and signal switching (VoIP gateway function) such as voice / video, it is possible to provide inexpensive and rich service to existing mobile network subscribers.

In addition, it provides interworking with existing WAP internet services currently provided in 2nd and 2nd generation and 2.5th generation and WAP protocol interworking function so that 2nd and 2.5th generation users can receive services provided in All IP core network.

2 and 3 only show connection lines (dotted lines) indicating packet exchange with IS95 CDMA access network and IS95 PCS access network, which are examples of such existing 2nd and 2.5th generation wireless access networks.

In addition, it supports roaming-related protocols that allow existing IP-based multimedia terminals to roam completely and interwork with signals, and each network supports mobility management of terminals using different wireless access networks. It fully supports mobility by interworking with DB such as HLR / VLR.

In addition, it performs the function of exchanging and delivering mobility support and user profile of each subscriber, including interworking with Bluetooth and cable / xDSL access network existing in the existing access gateway. Each protocol interface for this has a protocol stack as shown in FIG. 3, and for interworking between protocols, the present invention uses an API (Application Program Interface) function.

As shown in FIG. 3, the communication protocol stack and the gateway protocol stack are suitable for the gateway structure as shown in FIG. 2, that is, wireless data service between the second generation, the second generation, the third generation, and the third generation access network and the IP core network is possible. The communication protocol stack or gateway stack corresponding to each radio access network is mounted.

Each protocol stack that can be mounted and used in an access gateway according to the present invention is not limited to a specific one, but may be capable of performing various performances described below.

Access gateway device according to the present invention equipped with a protocol stack as shown in Figure 3, can manage the overall access gateway, manage the protocol layer, and the following various performance that can handle other exceptional situations (maintenance) ) Can be done by default.

1) Support all the functions of the conventional gateway shown in FIG.

2) Handoff support within or between access gateways.

3) Handoff support between different access networks.

4) Link layer handoff support between the same access network and another technology's access network.

5) Performs signal connection with the IS-95 CDMA radio access network.

6) Perform signal connection with the IS-95 PCS's radio access network.

7) Supports switching to IS-95 CDMA line-based voice frames and RTP IP-based frames.

8) Supports switching to IS-95 PCS line-based voice frames and RTP IP-based frames.

9) Supports WAP gateway function to provide access and receive Internet service provided by IP-based network for packet subscribers currently receiving wireless Internet service in IS-95 CDMA.

10) Supports the WAP gateway function to provide access to the Internet service provided by the IP-based network for packet subscribers currently receiving wireless Internet service in the IS-95 PCS.

11) Support roaming gateway function that can provide roaming service for 3rd generation mobile communication (synchronous / asynchronous) users.

12) Function to interlock with database (DB) such as HLR / VLR which stores existing location information and user related profile and store information related to existing DB.

13) Supporting routing protocols that can provide the fastest routing as components of an optimal IP packet network (IETF routing protocol support).

14) Supports switching and mapping between E.164 numbering and IP address / URL addressing.

15) Function that can support with regard to policy rule defined in IP-based network in terms of QoS.

16) Support the ability to negotiate services and types of services with existing mobile networks.

17) Support the media resource arbitration function so that users of the existing wireless network can receive the multimedia service in the All IP core network.

In summary, the access gateway device according to the present invention supports the WAP protocol to interoperate with the wireless Internet services provided by the existing 2nd and 2.5th generations, and also provides a roaming related signaling protocol to provide roaming services with other networks. All IP network by performing mobility management support function to ensure mobility for users who use each access network (ie, existing 2G, 2.5G and 3G line-based users and All IP mobile network subscriber). It can fully provide IP-based new services that exist in the future and will exist in the future.

In addition, it is equipped with a protocol related to VoIP gateway function to transfer and compatible voices of existing 2G, 2.5G and 3G line-based users in IP-based RTP frames, and in particular, it is necessary to perform each function. It has a broader concept structure and functionality than the existing access gateway by including management and maintenance functions and API functions that can provide switching and interface between each protocol.

The wireless access gateway device according to the present invention has the following effects.

1) Differentiated voice service can be provided. In particular, there is an effect that the existing wireless subscriber can reduce the service cost by differentiating the circuit-based voice and packet-based voice.

2) Efficient packet data service can be provided by integrating existing wireless Internet packet services into IP-based packet services.

3) The IP-based network can maintain the economics of 2nd and 2.5th generation mobile communication networks.

4) An increase in radio packet traffic can be obtained.

5) Maximize the reuse of existing 2G network and 2.5G network.

6) It can support efficient backward compatibility in all IP network.

7) There is an advantage that can support handoff between various access networks (Access Network).

8) It has the effect as a functional element that can provide roaming service between network operators according to the emerging 3rd generation mobile communication standard method.

9) There is an effect of providing a structure capable of accessing all future access networks as a network evolution-friendly structure.

The foregoing description is given as an example for understanding the present invention, and the present invention is not limited thereto, and various modifications may be made by those skilled in the art without departing from the spirit and scope of the appended claims. And variations are possible.

Claims (9)

A first gateway unit for performing a wireless data service between an IP-based core network and a 3rd generation or 4th generation or more wireless access network; And A second gateway unit for performing a wireless data service between the IP-based core network and second generation and 2.5 generation wireless access networks; The wireless data service includes an IP-based packet service, and protocol conversion, inter-protocol interworking, and interface for performing each function of the first and second gateway units are performed through an API function. The method of claim 1, The first gateway unit, A first connection unit on which a protocol stack corresponding to the corresponding wireless access network is mounted, for connecting to a third generation or more wireless access network; And And a first access gateway function unit equipped with a corresponding gateway protocol stack for communicating with the IP-based core network by exchanging and processing information packets with the first access unit or the second gateway unit. . The method of claim 2, The first connection portion, A CDMA2000 protocol stack for accessing a CDMA2000 access network; A Bluetooth protocol stack for connecting to a Bluetooth access network; And An access gateway device comprising a cable / xDSL protocol stack for connection with a cable / xDSL access network. The method of claim 3, wherein The first access gateway function unit, A VoIP gateway using RTP / UDP / IP for voice data and TCP / IP for data other than voice; A mobile IP support unit supporting IPv4 and IPv6 functions; And And a control unit for performing intra-network or inter-network handoff processing, address and number switching, QoS / policy processing, and the like. The method of claim 1, The second gateway unit: A second connection unit on which a protocol stack corresponding to the corresponding wireless access network is mounted for connection to second and second generation wireless access networks; And And a second access gateway function unit equipped with a corresponding gateway protocol stack for communicating with the IP-based core network by exchanging and processing an information packet with the second access unit or the first gateway unit. . The method of claim 5, The second connection portion, An IS95 CDMA protocol stack for connection with an IS95 CDMA access network; And And an IS95 PCS protocol stack for connection with an IS95 PCS access network. The method of claim 6, The second access gateway function unit, A WAP gateway function unit using WSP / WDP / TCP / IP for data from the IS95 CDMA access network and the IS95 PCS access network; A roaming gateway function unit using MAP and ANSI-41 / TCP / IP for roaming and signal interworking between terminals connected to the wireless access network; And An access gateway apparatus comprising a network mobility management support unit for mobility management between terminals connected to different wireless access networks. A wireless data service system for performing wireless data service between an IP-based core network and a second generation or more wireless access network, A wireless data service system for performing a wireless data service between the IP-based core network and a second generation or more wireless access network using the access gateway according to claim 1. A wireless data service method using an access gateway device for wireless data service between an IP-based core network and a second generation or more wireless access network, Connect with a corresponding wireless access network through a connection portion having a communication protocol stack corresponding to the corresponding wireless access network; Communicating with the IP-based core network through an access gateway means having a corresponding gateway protocol stack for exchanging and processing the access means and the information packet and communicating with the IP-based core network; Protocol processing and protocol stack interprocessing in said access gateway means are performed through an API function.