KR100379375B1 - How to Support Internet Service in Broadband Wireless Subscriber Network - Google Patents

Abstract

Broadband wireless subscriber network (B-WLL) in broadband broadband subscriber network (B-WLL), especially in the broadband wireless subscriber network (B-WLL) that provides broadband multimedia services to effectively provide Internet services over the Internet The present invention relates to a method of supporting an internet service of a self network, and to check whether a connection between an input port of a subscriber and an output port of a network is possible for internet service between a subscriber and a network, establishing a connection between the ports, and The present invention relates to a method for supporting Internet service of a broadband wireless subscriber network through which data can be transmitted in both directions through corresponding subscriber modems, thereby providing efficient Internet service through a broadband wireless subscriber network (B-WLL) system.

Description

How to Support Internet Service in Broadband Wireless Subscriber Network

The present invention relates to a broadband wireless subscriber network (B-WLL), and in particular, to support the Internet service of a broadband wireless subscriber network to effectively provide Internet services in a broadband wireless subscriber network (B-WLL) that provides broadband multimedia services. It is about a method.

In general, due to the development of wireless communication technology and the development of the millimeter wave band, a broadband wireless subscriber network (B-WLL), which is advantageous in terms of ease of network construction, scalability, and economics, is in the spotlight.

In order to realize the broadband wireless subscriber network (B-WLL), Korea announced the frequency in the 20 GHz band, and similar systems include the Canada's Local Multipoint Communication System (LMCS) and the US Regional Multipoint. Distributed Services (LMDS) and ATM Wireless Access (AWA) in Japan are being studied.

Standardization in relation to broadband wireless subscriber networks (B-WLL) is most prominent in the work of the Digital Audio Visual Council (abbreviated as DAVIC).

DAVIC publishes the 1.0 specification up to the 1.3 specification and presents the only specific standard for the broadband wireless subscriber network (B-WLL). DAVIC mentions down time division multiplexing (TDM), up time division multiple access (TDMA) multiple access schemes, and downlink, uplink frame structure, and media access control protocol. have.

In Korea, Ministry of Information and Communication Announcement No. 1997-49 specifies the frequency for the subscriber line of the broadband wireless subscriber network (B-WLL), which allocates 2 하향 down from 25.5 ㎓ to 27.5 에서 for bidirectional broadband service in the 20 ㎓ band. Upwardly, 500 MHz of 24.25 Hz to 24.75 Hz was allocated. Of these, the 800 MHz band of 26.7 GHz to 27.5 GHz was temporarily designated for cable television (CATV) transmission.

As such, ultra-high-speed broadband multimedia service using subscriber line frequency in the millimeter wave band (2MHz downwards 25.5㎓-27.5㎓ and 500MHz upwards 24.25㎓24.75㎓) for subscribers within a radius of about 2-5km. An LMDS system that provides is a system developed to deliver multi-channel TV programs to subscribers as a competition for wirelines in the cable television market.

Initially mainly used for cable TV distribution, it gradually developed into a two-way digital system, and the services that a system of two-way high-speed wireless communication concept can provide include voice telephone service, data communication service, interactive video service, voice / data / There are multimedia services and dedicated line services that combine video, and have subscriber types such as general public network subscribers, private network subscribers, and public network transmission relays.

In addition, MMDS, a broadband wireless subscriber network that provides wireless cable television service or high-speed Internet service using subscriber line frequencies in the millimeter wave band (2.535 GHz to 2.655 GHz) for subscribers within a radius of about 30 to 50 km. Standards are also presented in the DAVIC 1.3 specification.

1 is a block diagram showing a system configuration of a general broadband wireless subscriber network (B-WLL).

Referring to FIG. 1, a broadband wireless subscriber network (B-WLL) system may be broadly classified into a service provider 100 and a customer premises equipment unit (CPE) 200.

First, the service provider 100 may include a central office unit (COU) 110, a head-end unit 120, and a hub outdoor unit (HOU) 130. The subscriber unit (CPE) 200 is classified into a home subscriber unit 210 and an office subscriber unit 220.

The central office device (COU) 110 may appropriately multiplex the program and service contents supplied from each program provider, that is, the digital data stream through the network access device 111, thereby providing a headend device ( Head-end unit) 120.

The network connection device 111 performs a function of routing and multiplexing / demultiplexing the data streams transmitted from the ATM switch 113, the telephone switch 112, and the digital line access switch (DACS) 114.

ATM switch 113 is connected to the Internet (Internet) and the transmission control protocol / Internet Protocol (TCP / IP) to provide ATM-LAN service to the subscriber device (CPE) 200, the ATM cell structure data The data is analyzed in the form of a frame that can accommodate 2.048 Mbps digital signal level (DS-1E), 44.736 Mbps digital signal level (DS-3), or 155.52 Mbps synchronous transmission mode (STM-1). It is configured to perform the function of exchanging with the network connection device (111).

The telephone exchange 112 performs a function of establishing a mutual communication path when connecting to the PSTN, and accepts the V 5.2 protocol and is connected to the network connection device 111.

The DACS 114 converts the data transmitted from the leased line into a digital signal level (DS-1E) of 2.048 Mbps, a digital signal level (DS-3) of 44.736 Mbps, or a synchronous transmission mode of 155.52 Mbps. It is configured in the form of a frame that can accommodate the STM-1) and performs a function to deliver to the network connection device (111).

In addition, the central office unit (COU) 110 is provided with a network management unit 117 responsible for network management of the entire system, the integrated network management control station 116, and the billing processing unit 115 in charge of the subscriber billing; have.

The network management device 117 and the integrated network management control station 116 are in charge of all operations, state management, and information management of the subscriber device (CPE) 200 through information exchange with the network connection device 111. It is also responsible for network connection and state management between the network connection device 111 and the base station device 130.

To this end, a simple network management protocol (SNMP) / common management information protocol (CMIP) is used between the network access device 111 and the network management device 117. Network status data is received from 111 to perform network management. The same protocol is used between the network management device 117 and the integrated network management control station 116.

The billing processing unit 115 performs a task related to billing of the subscriber by using a centralized billing management method (CAMA: Centralized Automatic Message Accounting).

The head-end unit 120 modulates downstream data of the ATM cell structure transmitted from the network access unit 111 and transmits the data to the base station apparatus 130, and in the base station apparatus 130. The demodulated upstream data is demodulated and transmitted to the network access device 111.

The base station apparatus 130 amplifies and frequency-converts the downstream data transmitted from the head-end unit 120 and transmits it to the subscriber through a high-directional antenna, and the upstream data received through the radio section. Amplifies and converts the frequency to the head-end unit (120).

Sending and receiving downlink and upstream data of the millimeter wave band (2 GHz of 25.5 GHz to 27.5 GHz and 500 MHz of 24.25 GHz to 24.75 GHz) through the wireless section with the service provider 100 described above. The subscriber device (CPE) 200 may be classified into a home subscriber device 210 for home use and an office subscriber device 220 for office use.

The home subscriber station 210 has a peripheral device such as a TV, a telephone, a personal computer, and slightly differently, the office subscriber device 220 has a small capacity private automatic branch exchange (PABX) to support voice service. In other words, you have a router for data services.

The home subscriber unit 210 is an outdoor unit (ODU: Outdoor Unit) 211 that is installed outdoors for communication with the service provider 100, and is installed indoors and is a network interface unit (NIU) and a set-top unit (STU). It is composed of an indoor unit (IDU: Indoor Unit) 212 including a set-top unit, and the office subscriber unit 220 is also an outdoor unit (ODU) 221 and an indoor unit (IDU) 222. It is composed.

The interface formed between the network interface unit (NIU) and the set-top unit (STU) included in the home subscriber station 210 and the office subscriber unit 220 is an electrical system of a large integrated microprocessor (LSI) for protocol processing of ATM. It follows the universal interface, UTOPIA (Universal Test & Operations PHY Interface for ATM).

In addition, each outdoor unit (ODU) 211 and 221 of the home subscriber station 210 and the office subscriber station 220 converts and amplifies downstream data inputted through a high-directional antenna to a network interface unit (NIU). Alternatively, frequency conversion and amplification of upstream data transmitted from a network interface device (NIU) is transmitted through a high-directional antenna to a wireless section.

The network interface device (NIU) provided in the indoor unit (IDU) of each subscriber device (210,220) interfaces with the outdoor unit (ODU) 211,221 and peripheral devices which are a plurality of data terminals, and each set-top device ( STU) provides peripheral devices with communication functions such as video server, reception and exchange of video signal, and data communication service support function.

In addition, the office subscriber device 220 may be provided with a local area network server (LAN Server) for a plurality of clients (LAN) that wants a local area network service (LAN), the Ethernet (Ethernet) through the local area network server (LAN Server) ) Can be used.

However, the protocol standards for the broadband wireless subscriber network (B-WLL) configured as described above and providing broadband multimedia services and technical protection barriers of advanced countries have not been established yet.

Therefore, a method for ATM signal processing between a network access device and a subscriber device (CPE), a protocol stack and a service for implementing each service such as Internet service, PSTN service and leased line service in a broadband wireless subscriber network (B-WLL) The scenario is not yet defined.

The present invention has been made to solve the above problems, and an object thereof is to define a service scenario and related protocol stack for providing Internet service in a broadband wireless subscriber network (B-WLL) system.

A feature of the Internet service supporting method of the broadband wireless subscriber network according to the present invention for achieving the above object is to check whether the connection between the input port of the subscriber side and the output port of the network side for the Internet service between the subscriber side and the network side. Then, the connection between the ports is established, and data is transmitted in both directions between the corresponding subscriber modems through the connected port.

Preferably, the subscriber modem is used as an ATM-LAN server to transmit data in the bidirectional direction, thereby controlling transmission of data transmitted through a LAN physical medium, and thus data between a network and a LAN terminal providing ATM. As the subscriber modem is used as an ATM-LAN server, an ATM derivation protocol (ARP) is used to bind an upper layer Internet Protocol (IP) address and a lower layer Ethernet address to an ATM switch of a network side. There will be a server for.

In addition, as the subscriber modem is operated as a router during the bidirectional data transmission, bidirectional data is transmitted by a protocol for logical link control for data transmission and reception between LAN terminals and a protocol for performing connection to a network, or the bidirectional data transmission. As the subscriber modem operates as a bridge during data transmission, an Internet Protocol (IP) for routing is replaced with a bridging function layer, which is an interface for interconnecting LANs.

The port-to-port connection is established between an input port of the subscriber modem and an output port of an internet server provided at the network side for the internet service, and the subscriber modem and the internet server transmit a message transmitted for the connection between ports. After the analysis, the connection to these ports is examined to establish the connection to the corresponding ports.

1 is a block diagram showing the system configuration of a general broadband wireless subscriber network (B-WLL).

2A to 2F are diagrams illustrating a protocol stack configuration of a broadband wireless subscriber network (B-WLL) for supporting an Internet service according to the present invention.

2A is a diagram illustrating a protocol stack configuration when a subscriber modem is used as an ATM-LAN server.

2B is a diagram illustrating a protocol stack configuration when the subscriber modem operates as a router.

Fig. 2c is a diagram showing a protocol stack configuration in another case where the subscriber modem operates as a router.

FIG. 2D illustrates a protocol stack configuration when the subscriber modem operates as a bridge. FIG.

2E is a diagram illustrating a protocol stack configuration for communication between a general wired modem and a subscriber modem using an ATM-LAN terminal.

FIG. 2F illustrates a protocol stack configuration for communication between a general wired modem and a subscriber modem using the general modem through a telephone exchange. FIG.

3 is a diagram illustrating a service scenario for supporting an Internet service in a broadband wireless subscriber network (B-WLL) according to the present invention.

* Description of the symbols for the main parts of the drawings *

600: Internet server 610: ATM switch

620: head end device 630: subscriber modem

640: LAN terminal

Hereinafter, a preferred embodiment of an Internet service supporting method of a broadband wireless subscriber network (B-WLL) according to the present invention will be described with reference to the accompanying drawings.

The present invention focuses on protocol stacks and service scenarios for providing Internet services among Internet services, PSTN services, and leased line services in a broadband wireless subscriber network (B-WLL) system.

This is an invention for achieving protocol standardization in the ongoing process of B-WLL standardization.

2A to 2F are diagrams illustrating a protocol stack configuration of a broadband wireless subscriber network (B-WLL) for supporting an Internet service according to the present invention.

2A to 2F, the protocol stack for supporting the Internet service according to the present invention is composed of the following layers, and the specification for the physical layer and the wireless interval is described in detail in the DAVIC Recommendation and the ITU-T. The description of FIGS. 2A-2F focuses on the selection and implementation of signal processing protocols.

"PSTN-PHY" is a physical layer for a PSTN service defined for a PSTN transmission medium, and defines a physical layer transmission medium for transmitting a signal.

"ATM" is an ATM layer that processes all information through the "PSTN-PHY" in fixed-length cell units of 53 bytes.

"AAL" is an ATM adaptation layer that enables services to be provided to higher-level applications according to their characteristics, such as voice, video, and data. This ATM adaptation layer is a layer that coordinates 48-byte user information uniformly handled in ATM cells to match data units of various upper applications.

"SAAL" is an ATM adaptation layer for signal processing in a digital switching system.

"ATM-PHY" is a physical layer for transmitting ATM cells, and the physical layer transmission medium for this is specified in I.432, an I series of the ITU-T standard.

"UNI" is a user-network interface protocol layer that defines an interface between a user side and a network side. This layer follows the provisions of the Recommendation Series ITU-T Q Series on Digital Signaling and Common Line Signaling, including ITU-T Q.2931 and UNI 4.0 as recommended by the ATM Forum.

"NNI" is a network-network interface protocol layer that defines an interface for interworking between several networks. This layer, like the "UNI", is also in accordance with the provisions of the Recommended Series ITU-T Q Series on Digital Signal Exchange and Common Line Signaling, including ITU-T Q.2761 to Q.2764.

The "LMDS PHY" is the LMDS physical layer that defines the wireless transmission medium. It follows the DAVIC specification and is now available up to version 4.0.

"LMDS MAC" is the LMDS-MAC protocol layer with wireless media control. It follows the DAVIC specification and is now available up to version 4.0.

"LAN-PHY" is a LAN protocol physical layer that defines LAN transmission media. This layer controls network access and traffic by using IEEE 802.3, which is an Ethernet standard, and Token Passing. IEEE 802.4, the standard for bus networks, and IEEE 802.5, the standard for other LAN protocols.

"LAN-MAC" is a LAN-MAC protocol layer having a LAN medium control function, which is also defined in IEEE 802.3, IEEE 802.4, and IEEE 802.5.

In the protocol stack for the Internet service composed of such layers, a user plane-D for transmitting user data and a user plane-S for transmitting LMDS MAC messages -S) and three planes, a control plane for signal processing.

2A is a diagram illustrating a protocol stack configuration when a subscriber modem is used as an ATM-LAN server. FIG. 2A shows a user plane-D for transmitting user data and a user plane for transmitting an LMDS MAC message. It consists of three planes: User plane-S and control plane for signal processing.

Here, the "ATM-LAN server" layer exists only in the ATM switch 320 as a higher layer, and an Address Resolution Protocol (ARP) server exists only in the ATM switch 320.

This "ATM-LAN server" layer handles Address Derivation Protocol (ARP), which is a transport used to tie the upper layer's Internet Protocol (IP) address to the lower layer's Ethernet address. Control Protocol / Internet Protocol (TCP / IP).

FIG. 2B is a diagram illustrating a protocol stack configuration when a subscriber modem operates as a router, and includes a user plane-S for transmitting an LMDS MAC message and a protocol on a control plane for signal processing. The stack configuration is the same as that in FIG. 2A, and the " LLC / " layer of the " ATM-LAN " SNAP "layer.

The "LLC / SNAP" layer exists as a lower layer of "ATM ARP" between the ATM switch 320 and the subscriber modem 350 and the LAN terminal 360 in the user plane-S, and the logical link control. (LLC: Logic Link Control) and the protocol layer (SNAP) that performs access to the underlying network.

Here, the logical link control (LLC) is a control for establishing and releasing a sequence control, a retransmission control, a traffic amount control, and a logical link between devices to reliably transmit and receive frames between devices.

2B differs from the protocol shown in FIG. 2A in that there is a server in the subscriber modem 350 for processing an Address Derivation Protocol (ARP). In addition, in the user plane-S, the upper layer among the protocol layers existing between the ATM switch 320 and the subscriber modem 350 and the LAN terminal 360 is an "ATM RFC" layer, and an address used is derived. Protocol (ARP) is defined in the RFC2225 document on the Internet Protocol (IP) standard in Request for comments (RFC), a specification of Transmission Control Protocol / Internet Protocol (TCP / IP).

FIG. 2C is a diagram illustrating a protocol stack configuration in another case in which a subscriber modem operates as a router, and uses a "LANE" layer instead of the "LLC / SNAP" layer in FIG. 2B.

This "LANE" layer is a LAN emulation layer, which determines the interconnection between ATM and LAN.

FIG. 2D is a diagram illustrating a protocol stack configuration when the subscriber modem operates as a bridge. FIG. 2D shows an IP protocol layer for routing in FIG. 2C as a bridging function layer. In place, the subscriber modem 350 operates as a bridge.

Here, the "Bridging Function" layer is an interface layer for interconnecting LANs.

FIG. 2E is a diagram illustrating a protocol stack for communication between a general wired modem and a subscriber modem using an ATM-LAN terminal. FIG. 2E is a diagram illustrating a protocol stack for connecting a subscriber using a general wired modem to an ATM-LAN gateway (not shown). A connection was made using the LAN gateway 420.

Here, the ARP server exists only in the ATM switch 440.

Figure 2f is a diagram showing a protocol stack configuration for communication between a general wired modem and a subscriber modem using a common modem through a telephone exchange, here is connected to the network connection device 530 through a telephone exchange 520, There is no need for a MODEM-LAN gateway (not shown).

Also, unlike FIG. 2E, the ARP server does not exist in the ATM switch 520.

2A to 2F, when the subscriber modem is used as a router (FIGS. 2B and 2C) or when the subscriber modem operates as a bridge (FIG. 2D), the subscriber modem 320 and the ATM switch ( 350) shows that the ARP server exists in all.

Also in FIGS. 2A-2F, only some layers of user plane-D use different protocol layers in all cases (FIGS. 2A-2C), and user plane-S and control plane have similar protocol stacks in all cases. .

In addition, for communication between adjacent layers, information transmission in both up and down directions must be defined in advance, which is defined for each layer.

3 is a diagram illustrating a service scenario for supporting an Internet service in a broadband wireless subscriber network (B-WLL) according to the present invention.

Referring to FIG. 3, the illustrated service scenario illustrates a connection establishment and release procedure between user-network interface (UNI) ports.

When the subscriber modem 630 receives the "Setup" message from the LAN terminal 640 (S1), it checks which link the message is received from and finds the corresponding input port. In addition, the subscriber modem 630 notifies the ATM switch 610 of receiving the "Setup" message through the network, and accordingly, the ATM switch 610 transmits the "Setup" message to the Internet server 600 to transmit the corresponding output port. Find (S2).

Then, the message "Setup" is analyzed to analyze the called party address, the required bandwidth, and the quality of service (QoS). In this case, it is also possible to check the bandwidth, total number of connections, virtual path interface (VPI) / virtual channel interface (VCI) for the input port, and check whether the input port can be connected. Analyze the address to see if there is an output port.

After checking the bandwidth, total number of connections, virtual path interface (VPI) / virtual channel interface (VCI), etc. for the output port, it checks whether the output port can be connected and gives the system a unique connection identifier (ID). It stores the bandwidth of the input / output ports and the allocated virtual path interface (VPI) / virtual channel interface (VCI) in the connection structure.

Accordingly, the subscriber modem 630 transmits a " Call Proceeding " message to the LAN terminal 640 so that call progress can be performed to the input port (S3), and the Internet server 600 is transferred to the ATM switch 610. It transmits the "Call Proceeding" message to the call port to perform the call progress (S4).

Thereafter, when a "Connect" message is transmitted from the Internet server 600 to the ATM switch 610 (S5), the subscriber modem 630 is notified of this fact through the network. 640, the message "Connect".

When each of these "Connect" messages is delivered and a "Connect Ack" message, which is a response thereto, is returned (S7 and S8), connection establishment between the user-network interface (UNI) ports is completed.

Here, the input port is a port of the LAN terminal 640, and the output port is a port of the Internet server 600.

As described above, according to the Internet service supporting method of the broadband wireless subscriber network (B-WLL) of the present invention, as the protocol stack and service scenario for providing the Internet service are defined, the broadband wireless subscriber network (B-WLL) system is defined. Through this, it is possible to provide an efficient internet service.

Claims (6)

For internet service between subscriber side and network side, check whether connection between input port of subscriber side and output port of network side is possible, establish connection between the ports, and transmit data in both directions between corresponding subscriber modems through the connected port. Internet service support method for a broadband wireless subscriber network, characterized in that. 10. The network and LAN terminal of claim 1, wherein the subscriber modem is used as an ATM-LAN server to transmit data in both directions, thereby performing transmission control for data transmitted over a LAN physical medium and thereby providing ATM. Internet service support method of a broadband wireless subscriber network, characterized in that for transmitting data between. The method of claim 2, wherein as the subscriber modem is used as an ATM-LAN server, an address derivation protocol used to bind an upper layer Internet Protocol (IP) address and a lower layer Ethernet address to an ATM switch of a network side. A method for supporting Internet service of a broadband wireless subscriber network, wherein a server for ARP exists. The method of claim 1, wherein the subscriber modem is operated as a router during the bidirectional data transmission, thereby transmitting bidirectional data by a protocol for logical link control for data transmission and reception between LAN terminals and a protocol for performing connection to a network. Internet service support method of a broadband wireless subscriber network, characterized in that. 2. The method of claim 1, wherein the subscriber modem operates as a bridge during the bidirectional data transmission, so that an internet protocol (IP) for routing is connected to a bridging function layer, which is an interface for interconnecting LANs. Internet service support method for a broadband wireless subscriber network, characterized in that the use of the replacement. According to claim 1, The port-to-port connection is established between the input port of the subscriber modem and the output port of the Internet server provided on the network side for the Internet service, the subscriber modem and the Internet server is established between the port connection The method of supporting Internet service of a broadband wireless subscriber network, characterized by establishing a connection to a corresponding port by analyzing whether a connection to these ports is possible after analyzing a forwarded message.