WO2009038400A2

WO2009038400A2 - Apparatus and method for interworking mobile communication network with digital subscriber line network

Info

Publication number: WO2009038400A2
Application number: PCT/KR2008/005580
Authority: WO
Inventors: Dong Hyun Lee; Bong Ho Kim; Su Lyun Sung
Original assignee: Posdata Co., Ltd.
Priority date: 2007-09-21
Filing date: 2008-09-19
Publication date: 2009-03-26
Also published as: WO2009038400A3

Abstract

A method for interworking a mobile communication network with a DSL network is disclosed, in which the method comprises obtaining second downlink data according to a CS type of MS through the use of first downlink data received from the DSL network and protocol of the first downlink data when receiving the first downlink data; and transmitting the second downlink data to the mobile communication network including a BS and a control station which receive / transmit data according to a tunnel designated by a data path tag mapped to a service flow and a CS type of MS.

Description

APPARATUS AND METHOD FOR INTERWORKING MOBILE COMMUNICATION NETWORK WITH DIGITAL SUBSCRIBER

LINE NETWORK

Technical Field

[1] The present invention relates to an apparatus and method for interworking a mobile communication network with a digital subscriber line network, and more particularly, to an apparatus and method for interworking a mobile communication network with a wire digital subscriber line network according to a convergence sub-layer type and at least one of protocols of the digital subscriber line connected with the mobile communication network. Background Art

[2] A digital subscriber line network (hereinafter, referred to as 'DSL network') uses an

Internet protocol (hereinafter, referred to as 'IP') configuration which serves as a link protocol of a broadband remote access server (hereinafter, referred to as 'BRAS') and a terminal equipment (hereinafter, referred to as 'TE'), and also uses a PPP over Ethernet (hereinafter, referred to as 'PPPoE') for control and management of IP link. Also, the DSL network uses an IP over Ethernet (hereinafter, referred to as 'IPoE') for ensuring quality of service QoS in data transmission and audio/video services.

[3] Recently, there are increasing requests for wireless DSL services by businessmen using DSL services.

[4] Especially, "IEEE 802.16-2004 October 2004, Air Interface for Fixed and Mobile

Broadband Wireless Access Systems Amendment for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands, August 2004", "IEEE 802.16e-2005 March 2006, Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands", "WiMAX End-to-End Network Systems Architecture", and "WiMAX Forum Network Architecture show that many people are trying to find a method for interworking a mobile communication network based on IEEE 802.16 standard with an application service provider (hereinafter, referred to as 'ASP') of DSL network, a network service provider (hereinafter, referred to as 'NSP') of DSL network, or the BRAS of DSL network by WiMAX.

[5] However, unclear definition considering network architecture, protocol configuration, and procedure for interworking the mobile communication network with the DSL network may cause problems about provision of interworking service between the mobile communication network and DSL network. Disclosure of Invention

Technical Problem

[6] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for in- terworking a mobile communication network with a DSL network, which is capable of receiving and transmitting data according to an interface node between the mobile communication network and the DSL network, a data transmission protocol in the interface node, and a convergence sub-layer type used in an MS.

[7] Another object of the present invention is to provide an apparatus and method for in- terworking a mobile communication network with a DSL network, which is capable of managing downlink data from the DSL network in the mobile communication network interworking with the DSL network, or uplink data to be transmitted from the MS to the DSL network. Technical Solution

[8] To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a method for interworking a mobile communication network with a DSL network comprises obtaining second downlink data according to a CS type of MS through the use of first downlink data received from the DSL network and protocol of the first downlink data when receiving the first downlink data; and transmitting the second downlink data to the mobile communication network including a BS and a control station which receive/transmit data through a tunnel designated by a data path tag mapped to a service flow if the CS type of second downlink data is IP-CS, or through a tunnel designated by a data path tag mapped to an Ethernet address of TE if the CS type of second downlink data is ETH- CS.

[9] In another aspect of the present invention, a method for interworking a mobile communication network with a DSL network comprises receiving first uplink data from the mobile communication network including a BS and a control station which receive/ transmit data according to a tunnel designated by a data path tag mapped to a service flow and a CS type of MS; obtaining second uplink data according to a protocol of an interface node between the mobile communication network and the DSL network through the use of first uplink data; and transmitting the second uplink data to the DSL network via the interface node.

[10] In another aspect of the present invention, a method for interworking a mobile communication network including a BS and a control station with a DSL network comprises receiving downlink data of the DSL network in the control station, wherein the downlink data is processed according to a CS type of MS; determining the BS for receiving/transmitting the data from/to the MS according to a CID mapped to data path tag through the use of a tunnel designated by the data path tag mapped to a service flow if the CS type of downlink data is IP-CS, or through a tunnel designated by the data path tag mapped to an Ethernet address of TE if the CS type of downlink data is ETH-CS; transmitting the downlink data to the BS through the tunnel designated by the data path tag.

[11] In another aspect of the present invention, a method for interworking a mobile communication network including a BS and a control station with a DSL network comprises receiving uplink data in the control station through a tunnel designated by a data path tag from a BS which receives uplink data processed according to a CS type of MS from the MS matched to a CID mapped to the data path tag; and transmitting the uplink data received through the tunnel to an access service network of the mobile communication network for being transmitted to the DSL network when the CS type is IP-CS and a service flow mapped to the data path tag exists.

[12] In another aspect of the present invention, an apparatus for interworking a mobile communication network with a DSL network comprises a data receiving-transmitting unit configured to transmit second downlink data to the mobile communication network including a BS and a control station which receive/transmit data according to a tunnel designated by a data path tag mapped to a service flow and a CS type of MS when receiving first downlink data from the DSL network, and to transmit second uplink data to the DSL network through an interface node between the mobile communication network and the DSL network when receiving first uplink data; and a data converting unit configured to obtain the second downlink data according to the CS type through the use of the first downlink data and the protocol of the interface node, and to obtain the second uplink data according to the protocol through the use of the first uplink data.

Advantageous Effects

[13] An apparatus and method for interworking a mobile communication network with a

DSL network according to the present invention have the following advantages.

[14] First, the apparatus and method for interworking the mobile communication network with the DSL network according to the present invention are capable of receiving and transmitting data according to an interface node between the mobile communication network and the DSL network, a data transmission protocol in the interface node, and a convergence sub-layer type used in an MS.

[15] Also, it is possible to manage downlink data from the DSL network in the mobile communication network interworking with the DSL network, or uplink data to be transmitted from the MS to the DSL network. Brief Description of the Drawings

[16] FIG. 1 is a block diagram illustrating an IWU, a DSL network, and a mobile communication network for providing a DSL service according to the first, second, third and fourth embodiments of the present invention.

[17] FIG. 2 illustrates a protocol stack of a mobile communication network, an ASP, and an IWU to explain an apparatus and method for interworking the mobile communication network with a DSL network according to the first embodiment of the present invention.

[18] FIGs. 3 and 4 are flow charts of the method for interworking the mobile communication network with the DSL network according to the first embodiment of the present invention.

[19] FIG. 5 illustrates a protocol stack of a mobile communication network, an ASP or

NSP of a DSL network, and an IWU to explain an apparatus and method for interworking the mobile communication network with the DSL network according to the second embodiment of the present invention.

[20] FIGs. 6 and 7 are flow charts of the interworking method the mobile communication network with the DSL network according to the second embodiment of the present invention.

[21] FIG. 8 illustrates a protocol stack of a mobile communication network, an ASP or

NSP of a DSL network, and an IWU to explain an apparatus and method for interworking the mobile communication network with the DSL network according to the third embodiment of the present invention.

[22] FIGs. 9 and 10 are flow charts of the interworking method the mobile communication network with the DSL network according to the third embodiment of the present invention.

[23] FIG. 11 illustrates a protocol stack of a mobile communication network, an ASP, and an IWU to explain an apparatus and method for interworking the mobile communication network with the DSL network according to the fourth embodiment of the present invention.

[24] FIG. 12 is a block diagram illustrating an IWU, a DSL network, and a mobile communication network for providing a DSL service according to the fifth embodiment of the present invention.

[25] FIG. 13 illustrates a protocol stack of a mobile communication network, an ASP, and an IWU to explain an apparatus and method for interworking the mobile communication network with the DSL network according to the fifth embodiment of the present invention.

[26] FIGs. 14 and 15 are flow charts of the interworking method the mobile com- munication network with the DSL network according to the fifth embodiment of the present invention.

Best Mode for Carrying Out the Invention

[27] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[28] Hereinafter, an apparatus and method for interworking a mobile communication with a DSL network according to the present invention will be explained with reference to the accompanying drawings.

[29] FIG. 1 is a block diagram illustrating an interworking unit, a DSL network, and a mobile communication network for providing a DSL service according to the first, second, third and fourth embodiments of the present invention.

[30] As shown in FIG. 1, the mobile communication network 102 includes a connectivity service network (hereinafter, referred to as 'CSN') 106, an access service network (hereinafter, referred to as 'ASN') 108, a mobile station (hereinafter, referred to as 'MS') 118 included in a mobile terminal 112, and another MS 114 connected with terminal equipment (hereinafter, referred to as 'TE') 116.

[31] The CSN 106 includes an authentication-authorization-accounting (hereinafter, referred to as 'AAA', not shown), and a policy and charging rules function (hereinafter, referred to as 'PCRF', not shown). For the ASN 108 and MSs 114, 118, the CSN 106 performs functions of user authentication, authorization and accounting management through the AAA 104, and also generates both a billing-related rule and a network service policy for users through the PCRF. In addition, the CSN 102 may include a home agent (hereinafter, referred to as 'HA', not shown) supporting mobility of the MS.

[32] The ASN 108 includes an access service network gateway (hereinafter, referred to as

'ASN-GW, not shown), and a base station (hereinafter, referred to as 'BS', not shown). The ASN 108 performs a wireless interface function between the BS and the MSs 114, 118, a Layer-2 connection establishment function, a network discovery function, a network selection function, a transmission function for a Layer-3 connection establishment of the MSs 114, 118, and a radio resource management function.

[33] The ASN 108 transmits/receives data to/from the MS 114 using an Ethernet convergence sub-layer (hereinafter, referred to as 'ETH-CS') via the BS, or transmits/ receives data to/from the MS 118 using an Internet Protocol convergence sub-layer (hereinafter, referred to as 'IP-CS') via the BS. [34] For example, the MS 114 using the ETH-CS classifies an uplink packet received from an upper layer according to a predetermined criterion in the ETH-CS so as to transmit uplink data to the BS included in the ASN 108. In this case, the predetermined criterion for classification of uplink packet is based on information about an Ethernet frame included in the uplink packet. Also, a connection ID (hereinafter, referred to as 'CID') is added to the classified packet matched to an appropriate flow, and is transmitted to its lower layer, that is, MAC layer. Then, the uplink data created through the aforementioned procedure is transmitted to the BS matched to the CID via a physical layer.

[35] The DSL network 104 includes an application service provider (hereinafter, referred to as 'ASP') 120, a network service provider (hereinafter, referred to as 'NSP') 122, a broadband remote access server (hereinafter, referred to as 'BRAS') 124, a DSL access multiplexer (hereinafter, referred to as 'DSLAM') 126, and a modem 130 connected with a TE 132.

[36] The ASP 120 corresponds to a service provider which is related with an outsourcing of information systems and application parts of enterprises. The NSP 122 provides backbone service about infrastructure necessarily required for the Internet access to a provider which provides Internet access service.

[37] The BRAS 124 interworks the Internet with the DSLAM 126 so that a subscriber can access the Internet.

[38] In order to improve efficiency on provision of DSL service to the subscriber, the

DSLAM 126 multiplexes and de-multiplexes a plurality of DSL modems so as to make the DSL modems access the DSL network.

[39] An interworking unit (hereinafter, referred to as 'IWU') 134 is equipment for in- terworking the mobile communication network 102 with the DSL network 104.

[40] The IWU 134 transmits/receives data to/from the DSL network 104 according to a data receiving-transmitting protocol of interface node between the mobile communication network 102 and the DSL network 104, and according to a type of convergence sub-layer (hereinafter, referred to as 'CS') used in the MS 114, 118.

[41] <First embodiment

[42] The first embodiment of the present invention relates with an interworking apparatus and method between a mobile communication network 102 and a DSL network 104 via an IWU 134 when a CS type of an MS 114 is ETH-CS and a data receiving- transmitting protocol is used for PPP over Ethernet (hereinafter, referred to as 'PPPoE'), wherein the mobile communication network 102 may be connected with an interface node between a BRAS 124 of the DSL network 104 and an ASP 120 via the IWU 134, or an interface node between the BRAS 124 of the DSL network 104 and an NSP 122 via the IWU 134. [43] FIG. 2 illustrates a protocol stack of the mobile communication network 102, the

ASP 120 or NSP 122 of the DSL network 104, and the IWU 134 to explain the apparatus and method for interworking the mobile communication network 102 with the DSL network 104 according to the first embodiment of the present invention.

[44] A data interworking apparatus and method will be explained through the protocol stack and data transmission of downlink data from the ASP 120 or NSP 122 of the DSL network 104 to a TE 116 of the mobile communication network.

[45] Referring to the protocol stack 202 of ASP 120 or NSP 122 of the DSL network 104, a PPP packet is created by encapsulating an IP packet in a PPP layer, and the PPP packet is encapsulated using Layer 2 Tunneling Protocol (hereinafter, referred to as 'L2TP') for tunneling in a L2TP layer. To transmit the PPP packet from the IP layer to the IWU 134, a corresponding IP header is added to the PPP packet, and the downlink data is transmitted to the IWU 134 through a link layer and a physical layer. In one embodiment of the present invention, the protocol stack 202 may be a protocol stack of L2TP Network Server (hereinafter, referred to as 'LNS') included in the NSP 122.

[46] A downlink data interworking procedure will be explained with reference to the IWU

134 between the mobile communication network 102 and the DSL network 104 according to the first embodiment of the present invention.

[47] The IWU 134 between the mobile communication network 102 and the DLS network

104 according to the first embodiment of the present invention includes a data receiving-transmitting unit (not shown), an address storing unit (not shown), and a data converting unit (not shown).

[48] When the data receiving-transmitting unit receives the downlink data from the DSL network 104, the data receiving-transmitting unit transmits the downlink data passing through a specific converting procedure to the mobile communication network 102 including a BS 111 and an ASN-GW 110 corresponding to a control station.

[49] At this time, the converted data is received and transmitted between the BS 111 and the ASN-GW 110 according to the CS type of the MS 114 and a tunnel designated by a data path tag mapped to an Ethernet address of TE 116.

[50] On receiving uplink data from a CSN 106, the data receiving-transmitting unit transmits the converted uplink data to the ASP 120 or NSP 122 via the interface node between the mobile communication network 102 and the DSL network 104.

[51] Before the IWU 134 receives the downlink data from the DSL network 104, an

Ethernet address of TE 116 transmitted from the mobile communication network 102 is stored in the address storing unit. In one embodiment of the present invention, the Ethernet address of TE 116 may be an MAC address of Ethernet card matched to the MS 114.

[52] The data converting unit obtains the downlink data received from the ASP 120 or NSP 122, and the downlink data converted according to the CS type through the use of protocol of interface node. Also, the data converting unit obtains the uplink data converted according to the protocol of interface node through the use of uplink data received from the CSN 106.

[53] In one embodiment of the present invention, if a PPP header is included in the uplink data received from the ASP 120 or the data received from the CSN 106, the data converting unit determines the protocol of interface node as PPP. Meanwhile, if not, the data converting unit determines the protocol of interface node as IP.

[54] In the aforementioned embodiment of the present invention, the data receiving- transmitting unit, the address storing unit, and the data converting unit are provided separately. In a modified embodiment of the present invention, the data receiving- transmitting unit, the address storing unit, and the data converting unit may be integrated into one unit.

[55] A procedure of converting the downlink data in the IWU 134 through the protocol stack 204 of IWU 134 will be explained in detail. The data converting unit obtains the PPP packet from the downlink data received in the data receiving-transmitting unit by the reverse order of the aforementioned steps performed in the protocol stack 202 of ASP 120 or NSP 122.

[56] In one embodiment of the present invention, when the PPP header is included in the downlink data received in the data receiving-transmitting unit, it is determined that the PPP is used, and the data converting unit obtains the PPP packet.

[57] Thereafter, the PPP packet is encapsulated into a PPPoE frame in a PPPoE layer, so as to make the PPP packet used for a data field of Ethernet frame. In an Ethernet layer, the PPPoE frame is included as a data field, and the Ethernet frame including the Ethernet address of TE 116 stored in the address storing unit is generated. At this time, the PPP packet is mapped to the Ethernet address of TE 116, and the mapping information is previously stored in the address storing unit before creating the Ethernet frame.

[58] Then, the downlink data converted through the physical layer is transmitted to the

CSN 106 through the data receiving-transmitting unit.

[59] Referring to the protocol stack 206 of CSN 106 and ASN-GW 110, the CSN 106 obtains the Ethernet frame from the converted downlink data which is received by the reverse order of the aforementioned steps performed in the protocol stack 204 of IWU 134. The Ethernet frame is transmitted to the ASN-GW 110 mapped to the Ethernet address of TE 116. At this time, the Ethernet address of TE 116 and the mapping information of ASN-GW 110 may be previously stored in the CSN 106, which may be transmitted from the CSN 106 to the ASN-GW 110 through Ethernet transmission, IP transmission, or general routing encapsulation (hereinafter, referred to as 'GRE') tunnel.

[60] In the aforementioned embodiment of the present invention, the IWU 134 is separately provided from the CSN 106. In a modified embodiment of the present invention, the IWU 134 may be included in the CSN 106. In this case, the data receiving-transmitting unit of IWU 134 may transmit the Ethernet frame including the PPPoE frame to the corresponding ASN-GW 110 through the use of Ethernet address of TE 116 previously stored in the address storing unit and identification information of ASN-GW 110. At this time, the identification information of ASN-GW 110 may be the Ethernet address, IP address, or GRE key.

[61] The ASN-GW 110 obtains the Ethernet frame from the data received from the CSN

106, and selects the BS 111 and the data path tag mapped to the Ethernet address of MS.

[62] In a GRE layer, the Ethernet frame is encapsulated by adding the data path tag. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to data path ID.

[63] After adding the corresponding IP header to the selected BS 111 in the IP layer, the

Ethernet frame encapsulated through the link and physical layers is transmitted to the BS 111 via the tunnel designated by the data path ID.

[64] Referring to the protocol stack 208 of BS 111 , the BS 111 obtains the Ethernet frame from the converted downlink data which is received by the reverse order of the aforementioned steps performed in the protocol stack 206 of ASN-GW 110. In the Ethernet CS layer (ETH-CS), a CID mapped to the data path tag is added to the Ethernet frame, and is then transmitted to the MS 114 matched to the CID through a lower layer of IEEE 802.16.

[65] Referring to the protocol stack 210 of MS 114, the MS 114 obtains the Ethernet frame from the data received from the BS 111 by the reverse order of the aforementioned steps performed in the protocol stack 208 of BS 111, and transmits the obtained Ethernet frame to the TE 116 through the physical layer.

[66] Referring to the protocol stack 210 of TE 116, the Ethernet frame is obtained from the data received from the MS 114, and the desired date is finally obtained through the PPPoE layer, PPP layer, and IP layer in sequence.

[67] A visiting AAA (AAA_v) 136 may be included in the CSN 106, which serves as a proxy relaying authentication, authorization, and accounting procedures for receiving and transmitting data between a home AAA (AAA_h) 138 and the TE 116.

[68] In the aforementioned embodiment of the present invention, the data interworking method is explained with the protocol stack and downlink data transmission from the ASP 120 or NSP 122 to the TE 116, and the interworking method for the uplink data is explained by the reverse order of the aforementioned steps performed for the in- terworking method of the downlink data.

[69] FIGs. 3 and 4 are flow charts of the interworking method between the mobile communication network and the DSL network according to the first embodiment of the present invention.

[70] FIG. 3 is the flow chart illustrating the method for receiving and transmitting the downlink data through the use of PPPoE and Ethernet CS in the mobile communication network interworking with the DSL network according to the first embodiment of the present invention.

[71] First, the IWU between the mobile communication network and the DSL network receives the PPP packet using L2TP from the ASP or NSP in step S402a. In one embodiment of the present invention, the IWU can receive the PPP packet from the LNS included in the NSP.

[72] Then, the Ethernet address of TE matched to the PPP packet is obtained in step

S404a. In this case, the Ethernet address of TE may be previously stored in the IWU. When the IWU receives the downlink data from the DSL network, the IWU determines whether or not the PPP is used by checking whether or not the PPP header is included.

[73] Then, the Ethernet frame including the Ethernet header corresponding to the Ethernet address of TE and the PPPoE frame is transmitted to the CSN in step S406a.

[74] The CSN finds the Ethernet address of TE through the received Ethernet frame, determines the corresponding ASN-GW through the pre-stored Ethernet address of TE and the mapping information of address of ASN-GW, and transmits the received Ethernet frame to the corresponding ASN-GW in step S408a.

[75] The ASN-GW determines the data path tag mapped to the Ethernet address of TE and the BS in step S410a. Then, the data path tag is added to the Ethernet frame, and then the Ethernet frame with the data path tag is encapsulated using IP/GRE/ETH protocol stack. Thereafter, the encapsulated Ethernet frame is transmitted to the BS through the tunnel designated by the data path tag in step S412a. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to the data path ID.

[76] Next, the BS performs a de-capsulation procedure for the received Ethernet frame, obtains the CID mapped to the data path tag in step S414a, and transmits the Ethernet frame received from the ASN-GW to the corresponding MS matched with the CID in step S416a.

[77] The MS transmits the received Ethernet frame to the TE in step S418a, and the TE obtains the desired data from the received Ethernet frame in step S420a.

[78] FIG. 4 is the flow chart illustrating the method for receiving and transmitting the uplink data through the use of PPPoE and Ethernet CS in the mobile communication network interworking with the DSL network according to the first embodiment of the present invention.

[79] First, when the TE transmits the uplink Ethernet frame using PPPoE to the MS in step S402b, the MS selects the CID in step S404b, and transmits the received Ethernet frame to the corresponding BS matched to the CID in step S406b.

[80] Then, when the BS receives the Ethernet frame from the MS, the BS selects the corresponding data path tag and ASN-GW through the CID in step S408b, adds the data path tag to the received Ethernet frame, performs the encapsulation procedure using ETH/GRE/IP protocol stack, and transmits the encapsulated Ethernet frame to the ASN-GW via the tunnel designated by the data path tag in step S410b.

[81] The ASN-GW performs the de-capsulation procedure for the received Ethernet frame, and transmits the received Ethernet frame to the corresponding CSN in step S412b. The CSN transmits the received Ethernet frame to the IWU in step S414b.

[82] The IWU determines whether or not the received Ethernet frame includes the PPP header in step S416b. When it is determined that the PPP header is included in the received Ethernet frame, the PPP is used in the interface node between the DSL network and the mobile communication network, whereby the PPP packet obtained from the Ethernet frame is transmitted to the ASP or NSP through the use of L2TP in step S418b. Meanwhile, the case the PPP header is not included in the received Ethernet frame, that is, IP over Ethernet (hereinafter, referred to as 'IPoE') is used in the interface node between the DSL network and the mobile communication network will be explained with reference to the second embodiment of the present invention.

[83] <Second embodiment

[84] The second embodiment of the present invention relates with an interworking apparatus and method between a mobile communication network 102 and a DSL network 104 via an IWU 134 when a CS type of an MS 114 is ETH-CS and a data receiving-transmitting protocol is used for IPoE, wherein the mobile communication network 102 may be connected with an interface node between a BRAS 124 of the DSL network 104 and an ASP 120 via the IWU 134, or an interface node between the BRAS 124 of the DSL network 104 and an NSP 122 via the IWU 134.

[85] FIG. 5 illustrates a protocol stack of the mobile communication network 102, the

ASP 120 or NSP 122 of the DSL network 104, and the IWU 134 to explain the apparatus and method for interworking the mobile communication network 102 with the DSL network 104 according to the second embodiment of the present invention.

[86] A data interworking apparatus and method will be explained through the protocol stack and data transmission of downlink data from the ASP 120 or NSP 122 of the DSL network 104 to a TE 116 of the mobile communication network, wherein the detailed explanation for the same parts as those of the first embodiment of the present invention will be omitted. [87] Referring to the protocol stack 502 of ASP 120 or NSP 122 of the DSL network 104, the downlink data with an IP header corresponding to the TE 116 added thereto in an IP layer is transmitted to the IWU 134.

[88] A downlink data interworking procedure will be explained with reference to the protocol stack of FIG. 5 and the IWU 134 between the mobile communication network 102 and the DSL network 104 according to the second embodiment of the present invention.

[89] The IWU 134 between the mobile communication network 102 and the DLS network

104 according to the second embodiment of the present invention includes a data receiving-transmitting unit (not shown), an address storing unit (not shown), and a data converting unit (not shown).

[90] When the data receiving-transmitting unit receives the downlink data from the DSL network 104, the data receiving-transmitting unit transmits the received downlink data to the mobile communication network 102 including a BS 111 and an ASN-GW 110 corresponding to a control station after applying a predetermined converting procedure to the downlink data. At this time, the data is received and transmitted between the BS 111 and the ASN-GW 110 according to the CS type of the MS 114 and a tunnel designated by a data path tag mapped to an Ethernet address of MS 114.

[91] On receiving uplink data from a CSN 106, the data receiving-transmitting unit transmits the converted uplink data to the ASP 120 via the interface node between the mobile communication network 102 and the DSL network 104.

[92] Before the IWU 134 receives the downlink data from the DSL network 104, the

[93] The data converting unit obtains the downlink data received from the ASP 120 or

NSP 122, and the downlink data converted according to the CS type through the use of protocol of interface node. Also, the data converting unit obtains the uplink data converted according to the protocol of interface node through the use of uplink data received from the CSN 106.

[94] In one embodiment of the present invention, if a PPP header is included in the data received from the ASP 120 or the uplink data received from the CSN 106, the data converting unit determines the protocol of interface node as PPP. Meanwhile, if not, the data converting unit determines the protocol of interface node as IP.

[95] A procedure of converting the downlink data in the IWU 134 through the protocol stack 504 of IWU 134 shown in FIG. 5 will be explained in detail. The data converting unit obtains the IP packet from the downlink data received in the data receiving- transmitting unit by the reverse order of the aforementioned steps performed in the protocol stack 502 of ASP 120 or NSP 122.

[96] In one embodiment of the present invention, when the PPP header is included in the downlink data received in the data receiving-transmitting unit, it is determined that the PPP is used. Meanwhile, when the PPP header is not included in the downlink data received in the data receiving-transmitting unit, it is determined that the IP is used, whereby the IP packet is obtained.

[97] Then, an Ethernet frame is generated, which includes the obtained IP packet in an

Ethernet layer, and an Ethernet address of TE 116 previously stored in the address storing unit. At this time, the IP packet is mapped to the Ethernet address of TE 116, and the mapping information is previously stored in the address storing unit before creating the Ethernet frame.

[98] The downlink data converted into the Ethernet frame is transmitted to the CSN 106 via the data receiving-transmitting unit, and is then transmitted to the TE 116 through the protocol stack 506, 508, 510 of CSN 106, ASN-GW 110, BS 111, and MS 114 in sequence.

[99] In the second embodiment of the present invention, the IWU 134 is separately provided from the CSN 106. In a modified embodiment of the present invention, the IWU 134 may be included in the CSN 106. In this case, the data receiving-transmitting unit of IWU 134 may transmit the Ethernet frame to the corresponding ASN-GW 110 through the Ethernet address of TE 116 previously stored in the address storing unit and identification information of ASN-GW 110. At this time, the identification information of ASN-GW 110 may be the Ethernet address, IP address, or GRE key.

[100] Referring to the protocol stack 512 of TE 116, the desired data is obtained through the steps of obtaining the Ethernet frame from the data received from the MS 114, and performing a de-capsulation procedure of IP packet in the IP layer.

[101] In the aforementioned embodiment of the present invention, the data interworking method is explained with the protocol stack and downlink data transmission from the ASP 120 or NSP 122 to the TE 116, and the interworking method for the uplink data is explained by the reverse order of the aforementioned steps performed for the interworking method of the downlink data.

[102] FIGs. 6 and 7 are flow charts of the interworking method between the mobile communication network and the DSL network according to the second embodiment of the present invention.

[103] FIG. 6 is the flow chart illustrating the method for receiving and transmitting the downlink data through the use of Ethernet CS and IP in the mobile communication network interworking with the DSL network according to the second embodiment of the present invention. [104] First, the IWU between the mobile communication network and the DSL network receives the IP packet from the ASP or NSP of the DSL network in step S702a, and obtains the Ethernet address of TE corresponding to the received IP packet in step S704a. In this case, the Ethernet address of TE address may be previously stored in the IWU. When the IWU receives the downlink data from the DSL network, the IWU determines whether or not the PPP is used by checking whether or not the PPP header is included.

[105] Then, the Ethernet frame including the Ethernet header corresponding to the Ethernet address of TE and the IP packet is transmitted to the CSN in step S706a.

[106] The CSN finds the Ethernet address of TE through the received Ethernet frame, determines the corresponding ASN-GW through the pre-stored Ethernet address of TE and the mapping information of address of ASN-GW, and transmits the received Ethernet frame to the corresponding ASN-GW in step S708a.

[107] The ASN-GW determines the data path tag mapped to the Ethernet address of TE and the BS in step S710a. Then, the data path tag is added to the Ethernet frame, and then the Ethernet frame with the data path tag is encapsulated using IP/GRE/ETH protocol stack. Thereafter, the encapsulated Ethernet frame is transmitted to the BS through the tunnel designated by the data path tag in step S712a. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to the data path ID.

[108] Next, the BS performs the de-capsulation procedure for the received Ethernet frame, obtains the CID mapped to the data path tag in step S714a, and transmits the Ethernet frame received from the ASN-GW to the corresponding MS matched to the CID in step S716a.

[109] The MS transmits the received Ethernet frame to the TE in step S718a, and the TE finally obtains the desired data from the received Ethernet frame in step S720a.

[110] FIG. 7 is the flow chart illustrating the method for receiving and transmitting the uplink data through the use of Ethernet CS and IP in the mobile communication network interworking with the DSL network according to the second embodiment of the present invention.

[I l l] First, when the TE transmits the uplink Ethernet frame including the IP packet to the MS in step S702b, the MS selects the CID in step S704b, and transmits the received Ethernet frame to the corresponding BS matched to the CID in step S706b.

[112] Then, when the BS receives the Ethernet frame from the MS, the BS selects the corresponding data path tag and ASN-GW through the CID in step S708b, adds the data path tag to the received Ethernet frame, performs the encapsulation procedure using ETH/GRE/IP protocol stack, and transmits the encapsulated Ethernet frame to the ASN-GW via the tunnel designated by the data path tag in step S710b. [113] The ASN-GW performs the de-capsulation procedure for the received Ethernet frame, and transmits the received Ethernet frame to the corresponding CSN in step S712b. The CSN transmits the received Ethernet frame to the IWU in step S714b.

[114] The IWU determines whether or not the received Ethernet frame includes the PPP header in step S716b. When it is determined that the PPP header is not included in the received Ethernet frame, the IP is used in the interface node between the DSL network and the mobile communication network, and the IP packet obtained from the Ethernet frame is transmitted to the ASP or NSP in step S718b. The case the PPP header is included in the Ethernet frame, that is, using the PPPoE can be explained with reference to the first embodiment of the present invention.

[115] <Third embodiment

[116] The third embodiment of the present invention relates with an interworking apparatus and method between a mobile communication network 102 and a DSL network 104 via an IWU 134 when a CS type of an MS 118 is IP-CS and a data receiving- transmitting protocol is used for IP, wherein the mobile communication network 102 may be connected with an interface node between a BRAS 124 of the DSL network 104 and an ASP 120 via the IWU 134, or an interface node between the BRAS 124 of the DSL network 104 and an NSP 122 via the IWU 134.

[117] FIG. 8 illustrates a protocol stack of the mobile communication network 102, the ASP 120 or NSP 122 of the DSL network 104, and the IWU 134 to explain the apparatus and method for interworking the mobile communication network 102 with the DSL network 104 according to the third embodiment of the present invention.

[118] A data interworking apparatus and method will be explained through the protocol stack and data transmission of downlink data from the ASP 120 to the MS 118, wherein the detailed explanation for the same parts as those of the first embodiment of the present invention will be omitted.

[119] Referring to the protocol stack 802 of ASP 120, the downlink data with an IP header corresponding to the MS 118 added thereto in an IP layer is transmitted to the IWU 134.

[120] A downlink data interworking procedure will be explained with reference to the protocol stack of FIG. 8 and the IWU 134 between the mobile communication network 102 and the DSL network 104 according to the third embodiment of the present invention.

[121] When the IWU 134 receives the downlink data from the DSL network 104, the IWU 134 transmits the received downlink data to the mobile communication network 102 including a BS 111 and an ASN-GW 110 corresponding to a control station. At this time, the data is received and transmitted between the BS 111 and the ASN-GW 110 according to the CS type of the MS 118 and a tunnel designated by a data path tag mapped to an Ethernet address of MS 118.

[122] When the IWU 134 receives uplink data from a CSN 106, the IWU 134 transmits the received uplink data to the ASP 120 or NSP 122 via the interface node between the mobile communication network 102 and the DSL network 104.

[123] A detailed procedure of transmitting the downlink data is explained with reference to FIG. 8. When the downlink data received from the ASP 120 or NSP 122 is IP packet, and the MS 118 uses IP-CS, the IWU 134 transmits the downlink data to the CSN 106.

[124] Referring to the protocol stack 806 of CSN 106 and ASN-GW 110, the CSN 106 obtains the IP packet from the converted downlink data which is received by the reverse order of the steps performed in the protocol stack 802 of ASP 120 or NSP 122. Then, the IP packet is transmitted to the corresponding ASN-GW 110 mapped to the IP packet. At this time, the mapping information between the IP packet and the ASN-GW 110 may be previously stored in the CSN 106. Also, the data may be transmitted from the CSN 106 to the ASN-GW 110 through Ethernet transmission, IP transmission, or GRE tunnel.

[125] In the aforementioned embodiment of the present invention, the IWU 134 is separately provided from the CSN 106. In a modified embodiment of the present invention, the IWU 134 may be included in the CSN 106. In this case, the IP address of MS 118 and the mapping information of identification information of ASN-GW 110 are previously stored in the IWU 134. When the IP packet is transmitted to the IWU 134, the IWU 134 transmits the IP packet to the corresponding ASN-GW 110 through the use of mapping information previously stored in the IWU 134. At this time, the identification information of ASN-GW 110 may be the Ethernet address, IP address, or GRE key of ASN-GW 110.

[126] The ASN-GW 110 selects the BS 111 and a data path tag mapped to a service flow of the IP packet received from the CSN 106. In a GRE layer, the received IP packet is encapsulated by adding the data path tag. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to data path ID included in the service flow information.

[127] After adding the corresponding IP header to the selected BS 111 in the IP layer, the IP packet encapsulated through link and physical layers is transmitted to the BS l I l via the tunnel designated by the data path ID.

[128] Referring to the protocol stack 808 of BS 111 , the BS 111 obtains the IP packet from the downlink data which is received by the reverse order of the aforementioned steps performed in the protocol stack 206 of ASN-GW 110. In an IP-CS layer, a CID mapped to the data path tag is added to the IP packet, and is then transmitted to the MS 118 corresponding to the CID through a lower layer of IEEE 802.16.

[129] Referring to the protocol stack 810 of MS 118, the desired data is obtained through a de-capsulation procedure of the IP packet in the IP layer.

[130] In the aforementioned embodiment of the present invention, the data interworking method is explained with the protocol stack and downlink data transmission from the ASP 120 or NSP 122 to the MS 118, and the interworking method for the uplink data is explained by the reverse order of the aforementioned steps performed for the interworking method of the downlink data.

[131] FIGs. 9 and 10 are flow charts of the interworking method between the mobile communication network and the DSL network according to the third embodiment of the present invention.

[132] FIG. 9 is the flow chart illustrating the method for receiving and transmitting the downlink data through the use of IP-CS and IP in the mobile communication network interworking with the DSL network according to the third embodiment of the present invention.

[133] First, the IWU between the mobile communication network and the DSL network receives the IP packet from the ASP or NSP of the DSL network in step S 1002a, and transmits the received IP packet to the CSN in step S 1004a.

[134] Then, the CSN finds the IP address of MS through the use of the received IP packet, determines the corresponding ASN-GW through the use of the mapping information between the address of ASN-GW and the pre-stored IP address of MS, and transmits the received IP packet to the corresponding ASN-GW in step S 1006a.

[135] The ASN-GW selects the BS and the data path tag corresponding to the service flow of the received IP packet in step S 1008a. After adding the data path tag to the IP packet and performing the GRE procedure, the IP packet with the data path tag is transmitted to the BS via the tunnel designated by the data path tag in step SlOlOa. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to the data path ID of the service flow information.

[136] The BS performs the GRE de-capsulation procedure for the received IP packet, obtains the CID mapped to the data path tag in step S 1012a, and transmits the IP packet received from the ASN-GW to the corresponding MS matched with the CID in step 1014a. Thus, the MS finally obtains the desired data from the received IP packet in step S 1016a.

[137] FIG. 10 is the flow chart illustrating the method for receiving and transmitting the uplink data through the use of IP-CS and IP in the mobile communication network interworking with the DSL network according to the third embodiment of the present invention.

[138] First, the MS selects the CID in step S1002b, and transmits the IP packet to the BS matched to the CID based on the IP-CS in step S 1004b.

[139] When the BS receives the IP packet from the MS, the BS selects the corresponding data path tag and ASN-GW through the CID in step S 1006b, adds the data path tag to the received IP packet, performs the GRE procedure, and transmits the IP packet with the data path tag to the ASN-GW through the tunnel designated by the data path tag in step S 1008b.

[140] Then, the ASN-GW performs the de-capsulation procedure for the received IP packet, and transmits the de-capsulated IP packet to the corresponding CSN in step SlOlOb. Then, the CSN transmits the received IP packet to the IWU in step S 1012b, and the IWU transmits the received IP packet to the ASP or NSP in step S 1014b.

[141] <Fourth embodiment

[142] The fourth embodiment of the present invention relates with a mobile communication network 102 supporting a mobile Internet protocol (hereinafter, referred to as 'MIP'), wherein the mobile communication network 102 is connected with an interface node between a BRAS 124 of a DSL network 104 and an ASP 120 or NSP 122 via an IWU 134, a CS type of an MS 114 is ETH-CS or IP-CS, and the MS 114 of the mobile communication network 102 and the DSL network 104 use IPoE so as to receive and transmit data therebetween.

[143] A data interworking apparatus and method according to the fourth embodiment of the present invention will be explained with reference to FIG. 11, wherein the detailed explanation for the same parts as those of the first embodiment of the present invention will be omitted.

[144] Referring to the protocol stack 901a, 901b of ASP 120 or NSP 122 of the DSL network 104 shown in FIG. 11, an IP packet is encapsulated in an L2TP layer through the use of L2TP for tunneling, and downlink data with an IP header added in an IP layer is transmitted to the IWU 134.

[145] Referring to the protocol stack 903a of IWU 134 and HA 146, the IWU 134 transmits the IP packet obtained by the reverse order of the steps performed in the protocol stack 901a, 901b of ASP 120 or NSP 122 to the HA 146.

[146] Then, the HA 146 encapsulates the received IP packet in the IP layer so as to realize IPinIP type suitable for being transmitted to the ASN-GW 110.

[147] In an Ethernet layer, an Ethernet frame is generated, which includes the encapsulated IP packet of IPinIP type and Ethernet address of TE 116. At this time, the IP packet is mapped to the Ethernet address of TE 116, and the mapping information is previously stored before creating the Ethernet frame. Then, the converted downlink data is transmitted to the ASN-GW 110 through the physical layer.

[148] In this case, the HA 146 can transmit the Ethernet frame including the IP packet of IPinIP type to the corresponding ASN-GW 110 through the identification information of ASN-GW 110 and the pre-stored Ethernet address of TE 116. At this time, the identification information of ASN-GW 110 may be the Ethernet address, IP address, or GRE key of the ASN-GW 110.

[149] In the aforementioned embodiment of the present invention, the IWU 134 is separately provided from the CSN 106. In a modified embodiment of the present invention, the IWU 134 may be included in the CSN 106.

[150] Referring to the protocol stack 905a, 905b of ASN-GW 110, the ASN-GW 110 obtains the IP packet from the converted downlink data which is received by the reverse order of the aforementioned steps performed in the protocol stack 903a, 903b of the IWU 134.

[151] The ASN-GW 110 obtains the IP packet from the data received from the CSN 106. Also, if the CS layer of MS corresponds to ETH-CS, the ASN-GW 110 determines the BS 111 and the data path tag mapped to the Ethernet address of data received from the CSN 106. If the CS layer of MS corresponds to IP-CS, the ASN-GW 110 determines the BS 111 and the data path mapped to the service flow. In this case, if the CS layer of MS is ETH-CS 905b, the Ethernet header is added to the IP packet, and then the IP packet with the Ethernet header is encapsulated.

[152] In the GRE layer, the IP packet is encapsulated by adding the data path tag. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to the data path ID.

[153] After adding the corresponding IP header to the selected BS 111 in the IP layer, the Ethernet frame encapsulated through the Ethernet and physical layers is transmitted to the BS 111 via the tunnel designated by the data path ID.

[154] Referring to the protocol stack 907a, 907b of BS 111, the BS 111 obtains the IP packet from the converted downlink data which is received by the reverse order of the steps performed in the protocol stack 905a, 905b of ASN-GW 110.

[155] If the CS type of MS is IP-CS, the CID mapped to the data path tag is added to the IP packet in the IP-CS layer, and the IP packet with the CID is transmitted to the corresponding MS 114 matched with the CID via the lower layer of IEEE 802.16. Meanwhile, if the CS type of MS is ETH-CS, the CID mapped to the data path tag is added to the IP packet in the ETH-CS layer, and the IP packet with the CID is transmitted to the corresponding MS 114 matched to the CID via the lower layer of IEEE 802.16.

[156] Referring to the protocol stack 909a, 909b of MS 114, the MS 114 obtains the Ethernet frame from the data received from the BS 111 by the reverse order of the steps performed in the protocol stack 907a, 907b of BS 111, and then transmits the obtained Ethernet frame to the TE 116 via the physical layer.

[157] Referring to the protocol stack 91 Ia, 91 Ib of TE 116, desired data is obtained through the steps of obtaining the Ethernet frame from the data received from the MS 114, and performing a de-capsulation procedure of IP packet in the IP layer. [158] A visiting AAA (AAA_v) 150 may be included in the CSN 106, which serves as a proxy relaying authentication, authorization, and accounting procedures for receiving and transmitting data between a home AAA (AAA_h) 152 and the TE 116.

[159] In the aforementioned embodiment of the present invention, the data interworking method is explained with the protocol stack and downlink data transmission from the ASP 120 or NSP 122 to the TE 116, and the interworking method for the uplink data is explained by the reverse order of the aforementioned steps performed for the interworking method of the downlink data.

[160] <Fifth embodiment

[161] FIG. 12 illustrates a mobile communication network, a DSL network, and an IWU to provide a DSL service according to the fifth embodiment of the present invention.

[162] As shown in FIG. 12, the mobile communication network 1102 includes a CSN

1106, an ASN 1108, an MS 1118 included in a home gateway 1112, and an MS 1114 connected with a TE 1116.

[163] The DSL network 1104 includes an ASP 1120, an NSP 1122, a BRAS 1124, a DSLAM 1126, and a modem 1130 connected with TE 1132.

[164] The fifth embodiment of the present invention relates with an interworking apparatus and method between the mobile communication network 1102 and the DSL network 1104 via the IWU 1134 when a CS type of an MS 1114 is ETH-CS and a data receiving-transmitting protocol between the TE 1116 of mobile communication network 1102 and the DSL network 1104 is performed through PPPoE or IPoE, wherein the mobile communication network 1102 is connected with an interface node between the BRAS 1124 of DSL network 1104 and the DSLAM 1126 via the IWU 1134.

[165] FIG. 13 illustrates a protocol stack of the mobile communication network 1102, the BRAS 1124, and the IWU 134 to explain the apparatus and method for interworking between the mobile communication network 1102 and the DSL network 1104 according to the fifth embodiment of the present invention.

[166] A data interworking apparatus and method will be explained through the protocol stack and data transmission of downlink data from the BRAS 1124 to the TE 1116 through the use of PPPoE.

[167] Referring to the protocol stack 1146a of BRAS 1124, the BRAS 1124 creates a PPP packet by encapsulating an IP packet in a PPP layer, and encapsulates the PPP packet to a PPPoE frame so as to use the PPP packet as a data field of Ethernet frame.

[168] Also, the BRAS 1124 creates the Ethernet frame including an Ethernet address of MS 1114 and the PPPoE frame as a data field in an Ethernet layer. Then, the BRAS 1124 extends the Ethernet frame to a VLAN frame according to IEEE 802. lad in a VLAN layer, and transmits the VLAN frame to the IWU 1134 via the physical layer. [169] A downlink data interworking procedure will be explained with reference to the protocol stack of FIG. 13 and the IWU 1134 between the mobile communication network 1102 and the DSL network 1104 according to the fifth embodiment of the present invention.

[170] The following example shows that the mobile communication network 1102 and the IWU 1134 of the DSL network 1104 according to the fifth embodiment of the present invention are included in the CSN 1106.

[171] The IWU 1134 transmits the downlink data received from the DSL network 1104 to the BS 1111 and the mobile communication network 1102 including the ASN-GW 1110 corresponding to a control station. At this time, the data is received and transmitted between the BS 1111 and the ASN-GW 1110 according to the CS type of MS 1114 and a tunnel designated by a data path tag mapped to an Ethernet address of MS 1114.

[172] The IWU 1134 transmits uplink data received from the CSN 1106 to the BRAS 1124 via the interface node between the mobile communication network 1102 and the DSL network 1104.

[173] Hereinafter, a procedure for transmitting the downlink data through the protocol stack 1148a of IWU 1134, CSN 1106, and ASN-GW 1110 shown in FIG. 13 will be explained in detail. The CSN 1106 obtains the Ethernet frame which is received by the reverse order of the steps performed in the protocol stack 1146a of BRAS 1124.

[174] Then, the CSN 1106 transmits the Ethernet frame to the ASN-GW 1110 mapped to the Ethernet address of MS 1114. Also, the data may be transmitted from the IWU 1134 to the ASN-GW 1110 through Ethernet transmission, IP transmission, or GRE tunnel.

[175] In the aforementioned embodiment of the present invention, the IWU 1134 is included in the CSN 1106. In a modified embodiment of the present invention, the IWU 1134 may be separately provided from the CSN 1106.

[176] The ASN-GW 1110 obtains the received Ethernet frame, and selects the BS 1111 and the data path tag mapped to the Ethernet address of MS.

[177] In a GRE layer, the Ethernet frame is encapsulated by adding the data path tag. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to data path ID.

[178] After adding the corresponding IP header to the selected BS 1111 in the IP layer, the Ethernet frame encapsulated through the link and physical layers is transmitted to the BS 1111 via the tunnel designated by the data path ID.

[179] The data transmission procedure through the protocol stack 1150a, 1152a, 1154a of BS 1111, MS 1114, and TE 1116 is identical to that of the first embodiment, whereby the explanation for the data transmission procedure will be omitted. [180] A data interworking apparatus and method will be explained through the protocol stack and data transmission of downlink data from the BRAS 1124 to the TE 1116 through the use of IPoE.

[181] Referring to the protocol stack 1146b of BRAS 1124, the IP packet created in the IP layer is extended to the Ethernet frame in the Ethernet layer without passing through the PPP layer. Accordingly, both the stack architecture 1148b with the ASN-GW 1110 and IWU 1134 included in the CSN 1106 and the stack architecture 1154b including the MS 1114 use the Ethernet frame without PPPoE.

[182] When comparing the downlink data transmission and protocol stack in the case using IPoE with the case using PPPoE, the difference between the two cases is generated by the Ethernet frame without PPPoE frame, transmitted from the BRAS 1124 to the IWU 1134. The stack architecture 1152b of BS 1111 and the redundant explanation for the data transmission procedure in the same parts will be omitted.

[183] FIGs. 14 and 15 are the flow charts illustrating the interworking method between the mobile communication network and the DSL network according to the fifth embodiment of the present invention.

[184] FIG. 14 is the flow chart illustrating the method for interworking the data between the mobile communication network and the DSL network through the use of ETH-CS and PPPoE, or through the use of ETH-CS and IPoE.

[185] First, the IWU between the mobile communication network and the DSL network selects IPoE or PPPoE from the BRAS of the DSL network, and receives the Ethernet frame extended to the VLAN frame in step S 1402a. At this time, the IWU is included in the CSN of the mobile communication network.

[186] Then, the IWU finds the Ethernet address of TE through the use of the received Ethernet frame, determines the corresponding ASN-GW through the use of the mapping information between the address of ASN-GW and the pre-stored Ethernet address of TE, and transmits the received Ethernet frame to the corresponding ASN- GW in step S 1404a.

[187] Then, the ASN-GW selects the BS and the data path tag mapped to the Ethernet address of TE in step S 1406a. After adding the data path tag to the Ethernet frame and performing the encapsulation procedure using IP/GRE/ETH protocol stack, the Ethernet frame with the data path tag is transmitted to the BS via the tunnel designated by the data path tag in step S 1408a. In one embodiment of the present invention, the data path tag may be the GRE key corresponding to the data path ID.

[188] Next, the BS performs a de-capsulation procedure for the received Ethernet frame, obtains the CID mapped to the data path tag in step S 1410a, and transmits the Ethernet frame received from the ASN-GW to the corresponding MS matched to the CID in step S 1412a. [189] The MS transmits the Ethernet frame received through ETH-CS to the TE in step S 1414a, and the TE obtains the desired data from the received Ethernet frame in step S1416a.

[190] FIG. 15 is the flow chart illustrating the method for receiving and transmitting the uplink data through the use of ETH-CS and PPPoE, or through the use of ETH-CS and IPoE in the mobile communication network interworking with the DSL network according to the fifth embodiment of the present invention.

[191] First, when the TE transmits the uplink Ethernet frame using PPPoE or IPoE to the MS in step S 1402b, the MS selects the CID in step S 1404b, and transmits the received Ethernet frame to the corresponding BS matched to the CID in step S 1406b.

[192] Then, when the BS receives the Ethernet frame from the MS, the BS selects the corresponding data path tag and ASN-GW through the CID in step S 1408b, adds the data path tag to the received Ethernet frame, performs the encapsulation procedure using ETH/GRE/IP protocol stack, and transmits the encapsulated Ethernet frame to the ASN-GW via the tunnel designated by the data path tag in step S 1410b.

[193] The ASN-GW performs the de-capsulation procedure for the received Ethernet frame, extends the received Ethernet frame to the VLAN frame, and transmits the extended one to the IWU in step S 1412b. At this time, the IWU is included in the CSN of the mobile communication network.

[194] Then, the IWU transmits the Ethernet frame extended to the VLAN frame to the BRAS in step S1414b.

[195] It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

[1] A method for interworking a mobile communication network with a DSL network comprising: obtaining second downlink data according to a CS type of the mobile communication network through the use of first downlink data received from the DSL network and protocol of the first downlink data when receiving the first downlink data; and transmitting the second downlink data to the mobile communication network including a BS and a control station which receive/transmit data through a tunnel designated by a data path tag mapped to a service flow if the CS type of second downlink data is IP-CS, or through a tunnel designated by a data path tag mapped to an Ethernet address of TE if the CS type of second downlink data is ETH-CS.

[2] The method of claim 1, further comprising storing the Ethernet address of TE, wherein, when the CS type is ETH-CS, the protocol is PPP, and the second downlink data is an Ethernet frame including the Ethernet address and a PPP packet corresponding to the first downlink data through PPPoE.

[3] The method of claim 2, wherein the PPP packet sets L2TP, and the PPP packet is transmitted through the set L2TP path.

[4] The method of claim 1, further comprising storing the Ethernet address of TE, wherein, when the CS type is ETH-CS, the protocol is IP, and the second downlink data is an Ethernet frame including the Ethernet address and an IP packet corresponding to the first downlink data.

[5] The method of claim 1, wherein the protocol is IP and the second downlink data is an IP packet corresponding to the first downlink data when the CS type is IP- CS.

[6] The method of claim 1, wherein the protocol is Ethernet and the second downlink data is an Ethernet frame corresponding to the first downlink data when the CS type is ETH-CS.

[7] The method of claim 6, wherein the Ethernet frame is transmitted via VLAN.

[8] The method of claim 1, wherein the protocol of first downlink data is determined based on whether or not the first downlink data includes a PPP header, that is, the first downlink data is determined as PPP when the PPP header is included, or the first downlink data is determined as IP when the PPP header is not included.

[9] The method of claim 1, wherein the first downlink data is received from ASP or

NSP of the DSL network, or BRAS.

[10] The method of claim 1, wherein the second downlink data is transmitted to CSN or control station.

[11] The method of claim 1, wherein the control station performs a proxy AAA function for AAA of the DSL network and AAA service if a billing-related rule is required for MS.

[12] A method for interworking a mobile communication network with a DSL network comprising: receiving first uplink data from the mobile communication network including a

BS and a control station which receive/transmit data through a tunnel designated by a data path tag mapped to a service flow if a CS type is IP-CS, or through a tunnel designated by a data path tag mapped to an Ethernet address of TE if the

CS type is ETH-CS; obtaining second uplink data according to a protocol of an interface node between the mobile communication network and the DSL network through the use of first uplink data; and transmitting the second uplink data to the DSL network via the interface node.

[13] The method of claim 12, wherein the protocol is PPP and the second uplink data is a PPP packet obtained from PPPoE of the first uplink data when the CS type is

ETH-CS.

[14] The method of claim 13, wherein the PPP packet sets L2TP, and the PPP packet is transmitted through the set L2TP path.

[15] The method of claim 12, wherein the protocol is IP and the second uplink data is an IP packet obtained from Ethernet frame corresponding to the first uplink data when the CS type is ETH-CS.

[16] The method of claim 12, wherein the protocol is IP and the second uplink data is

IP packet corresponding to the first uplink data when the CS type is IP-CS.

[17] The method of claim 12, wherein the protocol is Ethernet and the second uplink data is Ethernet frame corresponding to the first uplink data when the CS type is

ETH-CS.

[18] The method of claim 17, wherein the Ethernet frame is transmitted via VLAN.

[19] The method of claim 12, wherein the protocol of interface node is determined based on whether or not the first uplink data includes a PPP header, that is, the first uplink data is determined as PPP when the PPP header is included, or the first downlink data is determined as IP when the PPP header is not included.

[20] The method of claim 12, wherein the second uplink data is transmitted to ASP or

NSP of the DSL network, or BRAS via the interface node.

[21] The method of claim 12, wherein the control station performs a proxy AAA function for AAA of the DSL network and AAA service if a billing-related rule is required for MS.

[22] A method for interworking a mobile communication network with a DSL network comprising: receiving downlink data for DSL service including PPPoE or IPoE via interface with Ethernet aggregation node of the DSL network by using Ethernet protocol; and transmitting the downlink data to a control station of the mobile communication network by using the Ethernet protocol.

[23] The method of claim 22, further comprising transmitting the downlink data received from the control station to MS through the use of ETH-CS.

[24] An apparatus for interworking a mobile communication network with a DSL network comprising: a data receiving-transmitting unit configured to transmit second downlink data, obtained according to a CS type of the mobile communication network through the use of protocol of first downlink data received from the DSL network, such that the second downlink data is transmitted to the mobile communication network including a BS and a control station which receive/transmit data through a tunnel designated by a data path tag mapped to a service flow if the CS type of second downlink data is IP-CS, or through a tunnel designated by a data path tag mapped to an Ethernet address of TE if the CS type of second downlink data is ETH-CS, and to transmit second uplink data to the DSL network via an interface node between the mobile communication network and the DSL network when receiving first uplink data from the mobile communication network; and a data converting unit configured to obtain the second downlink data according to the CS type through the use of the first downlink data and the protocol of the interface node, and to obtain the second uplink data according to the protocol through the use of the first uplink data.

[25] The apparatus of claim 24, further comprising an address storing unit configured to store an Ethernet address of TE.

[26] The apparatus of claim 24, wherein the data converting unit determines the protocol of interface node based on whether or not the first uplink data includes a PPP header, that is, the first uplink data corresponds to the PPP when the PPP header is included, or the first downlink data corresponds to the IP when the PPP header is not included.

[27] The apparatus of claim 24, wherein the mobile communication network is connected to ASP or NSP of the DSL network, or BRAS via the interface node.