KR20000019263A - Method for implementing packet data of mobile communication in atm(asynchronous transfer mode) backbone network - Google Patents

Abstract

PURPOSE: A method is provided to have a packet data network on an ATM(Asynchronous Transfer Mode) backbone network, which provides a radio packet data service in a mobile communication system. CONSTITUTION: A method for implementing packet data of mobile communication in an ATM (Asynchronous Transfer Mode) backbone network, comprises the steps of: an RNC(Radio Network Controller) managing and controlling call control and transmission of user data, by wirelessly matching in a mobile station; an MSC(Mobile Switching Center) providing a location of the mobile station by including an ATM exchange, and switching packet data; a PDGN(Packet Data Gateway Node) managing an IP(Internet Protocol) movement of the mobile station, managing routing information of the packet data, and connecting the user packet data with other data networks.

Description

Implementation method of mobile communication packet data network in ATM backbone network

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for implementing a mobile packet data network (ATM) in an Asynchronous Backbone network, particularly a packet providing a wireless packet data service in a next generation mobile communication system. The present invention relates to a method for implementing a data network in a mobile communication network based on an ATM network.

In general, since the second generation mobile communication system mainly provides a service for a voice call, in order to process packet data, a network interworking device is additionally provided in the system for a voice call, thereby providing data communication service. This inefficiency and a lot of time is spent on call processing and traffic processing of data.

Therefore, the demand for high-speed wireless packet data service is increasing day by day in the next generation mobile communication system.

1 is a block diagram showing the configuration of a network for a packet data service in a conventional mobile communication network.

Referring to FIG. 1, in the conventional mobile communication network, packet data processing includes a base transceiver station (BTS) in which a mobile station having a terminal (TE) 1 and a mobile terminal (MT) 2 interconnected. Internet network / public packet data network in mobile data communication control system (6) via Station (3), Base Station Controller (BSC) (4) and Mobile Switching Center (MSC) (5). The packet data is processed by interlocking with (7).

Therefore, in the conventional second generation mobile communication system, since the data processing function of the circuit concept is performed rather than the packet concept, the capacity and operation of the switch are inefficient, and there is a problem in that a long time is required for data call processing and data traffic processing.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. In the implementation of a packet data network providing a wireless packet data service in a mobile communication network based on an ATM backbone network, a wireless matching with a mobile station is performed. Packet Data Gateway Node (PDGN) that manages and controls the connection between a Radio Network Controller (RNC) that manages and controls the transmission of packet data by using control and user data routing information. Providing a method of implementing a mobile communication packet data network in an ATM backbone network which enables a mobile subscriber to use a high-speed packet data communication service by configuring a network element including a gateway node). Its purpose is to.

In order to achieve the object of the present invention, the present invention provides a mobile station including a radio network controller (RNC) for managing and controlling call control and transmission of user data by wirelessly matching the mobile station. Mobile Switching Center (MSC) which provides location information and switches packet data, and PDGN which manages IP movement of the mobile station, manages routing information of packet data, and links user packet data with other data networks. Provides a network element including a (Packet Data Gateway Node).

The method further includes: transmitting a packet data call by the mobile station, establishing an ATM virtual circuit between the RNC and the PDGN, establishing a PPP link between the mobile station and the PDGN, and transmitting and receiving packet data between the mobile station and another data network. It provides a packet data transmission method consisting of a step.

1 is a block diagram showing the configuration of a network for packet data services in a conventional mobile communication network.

2 is a block diagram showing the configuration of a network element for a packet data network implementation according to the present invention;

3A illustrates a stack of signaling protocols of a packet data network in accordance with the present invention.

3B illustrates a stack of data transfer protocols of a packet data network in accordance with the present invention.

4 is a diagram showing that the PMDX function according to the present invention is multiplexed / demultiplexed by an ATM switch.

5 is a view showing a frame shape defined in the PMDX according to the present invention.

6 is a view showing each process in the transmission of packet data according to the present invention.

7 is a view showing a handoff method according to each state in the transmission of packet data according to the present invention.

Explanation of symbols for the main parts of the drawings

1, 12: terminal 2, 11: mobile terminal

3, 13 base station 4: base station

5: Mobile exchange 6: Mobile data communication control system

7, 17: Internet network / public packet data network

14: RNC 15: MSC / LR with ATM switch

16: PDGN 18: ISP

Hereinafter, a packet data network implementation method according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the configuration of a network element for a packet data network implementation according to the present invention.

Referring to Figure 2, the network element according to the present invention is composed of a mobile terminal (MT) 11 and a terminal (TE) 12, and the packet data or circuit data service option Internet / PPDN (Public Packet Data Network) Mobile station (MS) 10 for transmitting and receiving data to / from the mobile station 10, a base station (BS) 13 for providing a function of connecting a wireless channel with the mobile station 10, and the mobile station 10; Location information of the mobile station 10 and the routing information of the network element, including an ATM switch, and an RNC 14 that manages and controls transmission of packet data using call control and user data by routing information wirelessly. MSC / LR (Location Register) (15) for providing packet and switching packet data, Internet Protocol (IP) movement management of mobile station 10, routing information management of packet data and user packet Connect data to internet / PPDN (17) network Was made by PDGN (16) that. Here, LR is a home location register (HLR) and a visitor location register (VLR), and performs a location management function of a mobile station. An Internet Service Provider (ISP) providing an Internet service is connected to the Internet / PPDN 17 network.

A packet data network composed of such network elements is composed of a signaling link for managing call control and data transmission paths and a data link for transmitting user packet data. At this time, the signaling link follows the related recommendations between the MS and the RNC, and the RNC and the MSC, the MSC and the LR, and the MSC and the PDGN are configured by higher layers using the Signaling AAL (Signal ATM Adaptation Layer) of the ATM network. Is multiplexed / demultiplexed using a frame identifier on the ATM virtual line between the RNC and PDGN. In order to transmit data, packet data is transmitted by the data link after the signal link is established.

FIG. 3A illustrates a stack of a signaling protocol of a packet data network according to the present invention, and FIG. 3B illustrates a stack of a data transmission protocol of a packet data network according to the present invention.

As shown in FIG. 3A, in order to configure a signal link, the RNC, the MSC, and the PDGN are stacked with a PKTS (PacKeT Signaling; packet signaling) function on the upper layer of the SAAL (Signaling ATM Adaptation Layer). It requests the destination terminal node identifier (PID) of Point to Point Protocol (PPP) frame data transmitted by the mobile station when this packet call is originated, and the ATM virtual between RNC and PDGN. Set VNP if the VNP (Virtual Network Pipe) is not set. At this time, each node of the terminal node becomes a terminal node.

As shown in FIG. 3B, in order to configure a data link, the RNC and PDGN have a function of stacking PMDX (Packet Mux / DemuX) function on the upper layer of the AAL to connect PPP frame data of the mobile station to the VNP connected to the destination terminal node. Do it.

Also, AAL transfers VNP data of upper layer between RNC and PDGN, and ATM relay function of MSC manages routing of packet data so that it only functions when VNP is newly set or released. In this case, all VNP data of lower layer is transmitted.

4 is a diagram showing that the PMDX function according to the present invention is multiplexed / demultiplexed by an ATM switch.

As shown in Fig. 4, the function of the PMDX for multiplexing and demultiplexing the IMSI at the ATM exchange according to the IMSI (International Mobile Station Identifier) of each mobile station is shown.

5 is a view showing a frame shape defined in the PMDX according to the present invention.

As shown in FIG. 5, the frame in the PMDX is composed of IMSI and control, fields of service data unit (SDU) and trailer, control field direction bit and flow control bit. And SDU Type bits. At this time, flow control is performed on a virtual circuit in which the PPP frame of each mobile station is transmitted.

The packet data transmission method in the packet data network according to the present invention by the network element and the protocol stack configured as described above comprises the steps of: sending a packet data call by the mobile station; establishing an ATM virtual circuit between the RNC and the PDGN; Establishing a PPP link between the mobile station and the PDGN, and transmitting and receiving packet data between the mobile station and another data network.

First, when a mobile station sends a packet data call, the RNC queries the MSC / LR with the Terminal Node IDentifier (TNID) of the destination PDGN to establish an ATM virtual circuit VNP between the RNC and the PDGN. In response, establish the VNP link. At this time, if VNP is already set, no VNP is set.

Subsequently, the user frame data is transmitted to the corresponding VNP to establish a data link. At this time, since the user data frame has a unique identifier in the header of each frame, the PDGN recognizes the identifier and the PPP entity of the mobile station and the PPP entity of the PDGN are driven to establish a PPP link, thereby establishing data of a higher layer. It will provide a transmission path. If the PDGN receives a user data frame with a new identifier, it recognizes it as a new call connection request.

In the protocol stack for data transmission, the PMDX multiplexes / demultiplexes the PPP frame data of the mobile station to the VNP connected to the destination PDGN. ATM adaptation layer (AAL) allows upper VNP data to be passed between RNC and PDGN. The relay function of MSC manages the routing of packet data only, and it functions when VNP is newly set or released. Allow all VNP data to be delivered.

As such, the signal link and the data link are established to transmit and receive packet data between the mobile station and another data network. At this time, the PDGN provides an access point with another data network. If there is no PPP link between the mobile station and the PDGN after transmitting and receiving packet data between the mobile station and another data network, the VNP between the RNC and the PDGN is released.

6 is a view showing each process in the transmission of packet data according to the present invention, Figure 7 is a view showing a handoff method according to each state in the transmission of packet data according to the present invention.

Referring to FIG. 6, 1) is a flowchart illustrating a procedure according to the above for data transmission between the MS and the Internet / PPDN network.

2) to 4) are flow charts showing each method after data transmission between the MS and the Internet / PPDN network, and 2) shows the procedure of registering the MS with the PDGN by the mobile IP option. , 3) shows the incoming call procedure of the MS, and the incoming call of the MS is provided to the MS registered as the unique IP or the mobile IP. Upon receiving the IP diagram of the MS, the PDGN queries the MSC / LR with the MS's IMSI or IP address and the TNID of the target RNC. Upon receiving this, the MSC calls the MS with reference to the LR. If the call is successful, the MSC informs the PDGN of the TNID of the RNC that received the MS's call response. After the MSC informs the RNC of the TNID of the PDGN called at the call of the MS, the above procedure for data transmission is performed. 4) shows how the RNC transitions the PPP link to the Dormant Open state by releasing the lower relay layer of the Um section of the PPP data link. The RNC and the PDGN use the PPP timer and the PPP diagram. The Dormant timer is independently driven to control the PPP state.

Referring to FIG. 7, times 1) and 2) illustrate a handoff procedure between an RNC and an MSC when a PPP link is in an active state, and the PDGN is transferred to an anchoring node. Is performed. At this time, the handoff occurrence message and the new RNC indication message are compensated for transmission through the PKTS link. 3) shows the handoff procedure between RNCs when the PPP link is doped, and the new RNC informs the TNID of the anchoring PDGN and the new RNC notifies the PDGN of the handoff, thereby indicating the PPP frame data. Allow the PDGN to receive the transmission at the new RNC. 4) shows the handoff procedure between MSCs when the PPP link is in the dormant state, and the mobile station should inform the new RNC that the connection is in the dormant open state when the call is connected, and the MSC to which the new RNC belongs is connected through the HLR of the mobile station. The handoff detects the ankering PDGN and then notifies the RNC. The subsequent process is like a handoff between RNCs.

The call processing method that may occur in such a packet data service is performed by the following rules.

The mobile station simultaneously provides IP options, access options, and status information when the packet service originates. Here, the status becomes information such as IP registration, dormant / active, and the like.

If the VNP is not established with the destination terminal node, the VNP should be opened in advance at all times. If at least one PPP link between the mobile station and the PDGN is open, the VNP is not released. The identifier required for opening the VNP is a TNID.

The MSC / LR responds according to the rules according to the IP options when the RNC requires a destination TNID, and preserves the state when the mobile station is dormant and remains until the RNC releases it.

Here, the basic theory for implementing the present invention and the additional description to help the understanding of the above drawings are as follows.

First, the packet data network according to the present invention is as follows:

You can do it.

The MT selects the packet service option and calls the Internet / PPDN to

Packet network access to allow access to host servers in the workstation, MT can act as an internet server / host,

To provide application services in response to calls from clients.

Mobile packet termination and mobile station-to-mobile packet call service, which enables the MS to perform MS-to-MS packet data communication by using an IMSI address or calling a packet data terminal identifier assigned to the MS.

In addition, IP classification is classified into SIP option, MIP option, and UIP option terminal according to whether the MS owns the packet data terminal identifier, and the MS accesses the packet data service access according to the IP option. Allow the PDGN to be determined. The MS must always attach the IP option and access option when accessing the packet service.

In case of packet communication with UE or access to ISP (Internet Service Provider) designated packet service, IMSI number must be delivered at the same time. Like the MT, the PDGN has an IMSI number that a user can specify and communicate with. Then, the MSC provides the TNID of the called RNC or the TNID of the called PDGN to the calling RNC to establish a packet path for PPP frame data transmission, and establish a PPP link between the MS and the PDGN.

Here, if the PPP link connection method without the incoming IMSI number is attached according to the IP option, the Simple IP is used when the TE does not have a Mobile IP address or a permanently assigned unique IP. When the Internet packet service is requested, the PDGN allocates an IP address belonging to the PDGN sub-network ID to be used while the PPP link is maintained after the PPP link is connected. The terminal is distinguished from a mobile IP terminal or a unique IP terminal, thereby giving a meaning of accessing the Internet with a simple IP option.

If a terminal with a SIP (Simple IP) option requires packet data service access, the RNC requests the MSC / HLR the TNID address of the destination PDGN to be connected to, where the MSC / HLR is the PDGN closest to the RNC among the PDGNs connected to its network. In response, the packet data link between the RNC and the PDGN is established for the PPP frame data transfer between the SIP MS and the PDGN, thereby establishing a PPP link connection between the MS and the PDGN.

Mobile IP refers to a case where an IP in use in a fixed wired intranet / Internet is used by TE. When a MIP (Mobile IP) MS requests a packet call connection, the RNC sends a PPP frame data to a destination PDGN. The TNID is queried to the MSC / HLR, and the MSC / HLR returns the PDGN's packet data network ID that executes the foreign agent (FA) service registered by the mobile IP. The MIP is assumed to be registered only once when the power is ON and re-registers after the mobile IP registration timeout.The packet access service for registration is connected to the PDGN by executing a packet call with the SIP option. Register mobile IP at. The PDGN notifies the MSC / HLR that the IMSI MT of the MIP option has been registered to the MS when the mobile IP registration is completed.

Unique IP is a case where the Internet IP address assigned to TE or MT is a host ID in the PDGN's Internet sub-network ID, and the home network is a next generation mobile communication network to which its own terminal is subscribed. PDGN with IP address becomes the home gateway. HLR manages IP combined with IMSI for UIP (Unique IP) option terminal and manages TNID of PDGN which is IP home network gateway.

If packet service access is required with the UIP option, the RNC queries the MSC / HLR for the TNID of the PDGN, which is the home gateway of the UIP MT, and when the MSC / HLR responds, the RNC and the RNC for the PPP frame data transfer between the UIP MS and the PDGN. A packet data link is established between the PDGNs to establish a PPP link connection between the MS and the PDGN.

On the other hand, the connection state of the PPP link has an open state and an open state, and the open state has an active sub-state and a Dormant sub-state. .

In the open state, the PPP link between the MS and PDGN is connected by the PPP connection establishment procedure. In the release state, the PPP link between the MS and PDGN is not connected, and the active open state is a PPP frame on the PPP link. Data is being transmitted and received, Dormant Open is a state in which no PPP frame data is being transmitted on the PPP link, and the packet data traffic channel of the Um interval is released, but the MS and PDGN The PPP link state is said to be maintained.

When the packet data terminal accesses the Internet / PPDN packet network, the MS and the PDGN are connected to the PPP link, and higher layer data is transmitted through the PPP link. When a PPP link is connected, the MS connects to the link for the first time until the packet data communication is terminated by disconnecting and closing the PPP link at the MS or PDGN even if handoff or roaming occurs. The connection with the established PDGN.

To this end, the following method should be applied in which the RNC and the MSC / HLR control the packet routing table.

In the active open state, the old RNC provides the TNID of the PDGN to which the MS is connected to the new RNC in the handoff message, and the new RNC sends a signaling message indicating that the MS has been handed off to the PDGN. By forwarding, the PGN forwards PPP frame data transmitted to the MS to the new RNC. When the PPP link is open in dormant open state, the traffic channel of the radio section is released. In this case, the RNC is disconnected from the MT. Even if the MS moves to the new RNC area, the RNC does not Can not know. Therefore, after moving to the new RNC, when PPP frame data to be transmitted is generated, the RNC / PDGN should request the address of the PDGN / RNC to access the MSC / HLR as well as the initial packet call access and connection.

The IMGN address allocation of the PDGN assigns the IMSI number to the PDGN so that the PDGN can be connected to the packet data service. The PDGN may also configure a sub-network of an ISP or intranet.

In the implementation of the mobile communication packet data network in the ATM backbone network according to the present invention, by defining and providing a packet data processing procedure and each network element and protocol stack, a mobile subscriber can provide high-speed packet data communication in the future. It has the effect of being provided.

In addition, it is possible to easily implement a company's wireless intranet, ISP has the effect that can provide a variety of services by providing a unique IP to their subscribers.

Claims (7)

An RNC for wirelessly matching the mobile station to manage and control call control and transmission of user data; An MSC including an ATM switch and providing location information of the mobile station and switching packet data; The mobile communication packet data network of the ATM backbone network comprising a PDGN for managing IP movement of the mobile station and managing routing information of packet data and interworking user packet data with another data network. How to implement. 2. The RNC and PDGN of claim 1, wherein the RNC and the PDGN query the TNID of the PPP frame data transmitted by the mobile station when the mobile station sends a packet data call to the upper layer of the ATM layer to establish a signal link. A method of implementing a mobile communication packet data network in an ATM backbone network, which in turn stacks SAAL and PKTS functions to ensure that is set. 2. The RNC and PDGN of claim 1, wherein the RNC and the PDGN multiplex / provide a protocol for configuring the data link to an AAL for transmitting VNP data between the RNC and the PDGN to an ATM upper layer, and PPP frame data of the mobile station to a VNP connected to the destination PDGN. A method for implementing a mobile communication packet data network in an ATM backbone network, which in turn stacks PMDX functions for demultiplexing and connecting. The mobile station originating a packet data call; Establishing an ATM virtual circuit between the RNC and the PDGN; Establishing a PPP link between the mobile station and a PDGN; And transmitting and receiving packet data between the mobile station and another data network. 5. The method of claim 4 wherein the step of establishing an ATM virtual circuit between the RNC and the PDGN comprises the RNC querying the MSC / LR for the terminal node identifier of the destination PDGN and the MSC / LR responding to establish the VNP link. Implementation method of mobile communication packet data network in TMB backbone network. 5. The method of claim 4, wherein the establishing of the PPP link between the mobile station and the PDGN is performed by a PDGN recognizing an identifier of a header of user frame data transmitted to the VNP after an ATM virtual circuit is established. A method of implementing a mobile communication packet data network in an ATM backbone network by establishing a PPP link by allowing a PPP entity to be driven. 5. The mobile terminal of claim 4, wherein if there is no PPP link between the mobile station and the PDGN after transmitting and receiving packet data between the mobile station and another data network, the VNP between the RNC and the PDGN is released. Communication packet data network implementation method.