KR20040059569A - Coupling apparatus between CDMA-2000 BSC system and wireless LAN system - Google Patents

Abstract

PURPOSE: A system for interworking between a BSC(Base Station Controller) in a CDMA-2000 system and a WLAN(Wireless LAN) is provided to offer necessary services to users seamlessly even in respectively different system areas by linking a WLAN system with a BSC in a CDMA system. CONSTITUTION: A system for interworking between a BSC in a CDMA-2000 system and a WLAN is comprised of an IBS(Infrastructure Basic Service) controller(110), a router(120), APs(Access Points)(130), and a usual CDMA mobile communication system(200) containing a BS(Base Station)(210), a BSC(220), a BSM(Base Station Manager)(230), an MSC(Mobile Switching Center)(240), etc. The IBS controller(110) controls the APs(130) in the WLAN. The router(120) determines and transfers packet paths between many APs. The APs(130) control traffic flow and access for clients(140-144) in wireless sections.

Description

Coupling apparatus between CDMA-2000 BSC system and wireless LAN system

The present invention relates to an interworking device between a control station (BSC) and a wireless LAN (WLAN) of a CD-2000 system, and more particularly, code division multiple access (CDMA) for a wireless LAN (WLAN) system. A control station (BSC) and a wireless LAN (WLAN) of a CD-2000 system that link to a control station of a system to provide users in each wireless service area with the necessary services without disconnection in different system areas. It is related with the interlock device.

Looking at the current wireless network service type, a service of a type supported only in each service area is made. That is, in the cellular network area, a user accesses a cellular dedicated terminal to receive voice and data, and in a wireless LAN service area, a user accesses an access point (AP) using a laptop or PDA terminal equipped with a wireless LAN card. It is a form that sends and receives and data.

1 is a diagram illustrating a basic network topology of a typical WLAN.

A plurality of terminals equipped with a wireless network interface card (Infrastructure) independently of the infrastructure structure of a centralized control method for transmitting data by connecting the terminal to a wired LAN (LAN) using an AP, a kind of base station device Both ad-hoc structures that directly transmit data between them are supported. Ad-hoc networks are mainly used in temporary workgroups, etc., and may be configured by a server in an infrastructure network, or may operate alone in peer-to-peer mode. The infrastructure network connects the wireless terminal to the existing wired LAN through an access point, which is a wired or wireless connection. At this time, a wireless cell basic service set (BSS) is formed around the access point. The access point performs the same role as the cellular phone base station connecting all the terminals in the BSS to the LAN. In infrastructure mode, the channel is automatically found, so there is no need to specify it.

If the data traffic and traffic flowing on the LAN increase, the network becomes congested. If the access concentration is concentrated on one wireless access point, the traffic increases and it takes time to transmit the data. You can separate the traffic. It is also possible to configure one extended service set (ESS) by collecting several BSSs using channels that do not overlap each other. A terminal can be moved by roaming between different BSSs in the same ESS.

In addition to the existing 802.11 standard, IEEE 802.11b, developed as a new high-speed physical layer specification, is designed to transmit up to 11 Mbps at the physical layer in the 2.4 GHz Industrial, Scientific, and Medical (ISM) band using CCK modulation.

IEEE 802.11b uses CCK modulation as a spread-band method for 5.5 / 11 Mbps high-speed data transmission while using the media access control layer and DSSS physical layer standard of the 802.11 standard, so that backward compatibility with existing DSSS equipment can be maintained. .

The 802.11b standard uses the Complementary Sequence instead of the 11Chip Barker Code used by 802.11 to achieve 11Mbps at the physical layer. Complementary Sequence is composed of 64 code words of 8 chip size and they have strong mathematical characteristics such as multipath and fading which are frequently occurred in high speed transmission. 802.11b needs to increase the symbol rate to 1.375 Msymbol / s to maintain the same 11 Mchip / s level as 802.11. In 11 Mbps data rate, 8 bits per symbol are modulated for a total of 11 Mbps (8 bits * 1.375 Msymbol / s), and in 5.5 Mbps data rate, 4 bits per symbol are modulated for a total of 5.5 Mbps (4 bits * 1.375 Msymbol / s) You get the transmission speed.

In other words, as is well known, existing wireless network systems (Wireless LAN system, CDMA-2000 cellular system) are separated into separate networks, so users can disconnect the current network and connect to another network to access the network of the corresponding area separately. Inconvenient to connect.

Accordingly, the present invention has been proposed to solve various problems occurring in the existing wireless network system as described above.

An object of the present invention is to link a wireless LAN (WLAN) system to a control station of a code division multiple access (CDMA) system so that a user in each wireless service area is not disconnected even in different system areas. The present invention provides an interworking device between a control station (BSC) and a wireless LAN (WLAN) of a CD-2000 system.

The present invention for achieving the above object, has the high-speed mobility of the existing CDMA series by interfacing the wireless LAN to the control station of the CDMA2000-1x network, and low-speed mobility to the advantage that the mobile communication network that supports voice and data Provides the interworking device between the control station and the wireless LAN of the CD-2000 system to provide a seamless service from the user's point of view in the situation that the wireless LAN that provides a high data rate (11 Mbps) and has been activated. .

To this end, the present invention, by interfacing to the control station of the CDMA-2000 1x network to accommodate both the access point serving as a base station of the WLAN and the base station of the CDMA-2000 1x network, power traffic control, call control ( Implement a companion device to provide Call Control, Hand-off, etc.

By doing so, a single control station receives data from two base stations and shares an existing back-bone network to process control signals and IP packet data.

FIG. 1 is a diagram illustrating a basic network topology of a typical WLAN.

2 is an overall configuration diagram of an interworking device between a control station and a wireless LAN of a CDMA-2000 system according to the present invention;

3 is a detailed configuration diagram of an interworking device between a control station and a wireless LAN of a CDMA-2000 system according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110 ..... Infrastructure Basic Service (IBS) Controller

120 ..... Router

130 ..... Access Point

111 ..... rear card

112 ..... processor assembly

113 ..... ATM Wireless

114 ..... Infrastructure Basic Card Assembly

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above.

2 is an overall configuration diagram of an interworking device between a control station and a wireless LAN of a CDMA-2000 system according to the present invention.

Infrastructure Basic Service (IBS) controller 110 for controlling access points (APs) of a WLAN, a router 120 for determining and delivering a packet path between several APs, and a client 141 in a wireless section. 144 typically includes an access point (AP) 130 for controlling traffic flow and access to the 144 and a base station 210, a control station 220, a control station manager 230, an exchange 240, and the like. The CDMA mobile communication system 200 is composed of.

The interworking device between the control station and the wireless LAN of the CDMA-2000 system according to the present invention configured as described above is a wireless access system capable of supporting QoS, Security, Hand Over, Cell Coverage, and the like. The IEEE 802.11b (11Mbps) standard is applied. It is composed of test network with AP, and can be configured with IEEE 802.11g and IEEE 802.11a supporting 54Mbps data rate in the future.

64 Kbps PCM voice data is delivered from the client to the AP and processed via the Control Station (BSC) and the Mobile Switching System (MSC).

High speed packet data (11 Mbps) is transmitted from the client to the ATM Trunk Block (221) of the control station 220 through the AP, and the packet data from the High Speed Data Selector Block (HDSB) of the control station 220. After performing the SDU (Selection / Distribution Unit) function for the call, it is connected to the Packet Data Serving Node (PDSN) via the Packet Control Function Part (224) to the Internet network 260 or another network. Connected and processed.

3 is a detailed configuration diagram of an interworking device between a control station and a wireless LAN of a CDMA-2000 system according to the present invention.

As shown in the figure, the physical structure is that four IBSs are connected to one BSC 220 by OC-3, 10 APs are connected to each IBS by 100 Base-T, and 20 to one AP. 50 clients are wirelessly linked. Communication between BSS (Basic Service Set) must go through high level IBS controller, and it performs handoff and power control function between APs, and handles call processing, handoff, operation and resource management that occur between IBS systems. Processing is performed by the IBS selector in the control station 220.

The IBS system performs handoff functions for voice calls and packet data calls between various access points, power control of radio links, and the like, and is in charge of resource operation and management functions and system data loading functions. The high speed packet data received from each AP passes through the router and connects to the processor assembly 112 via Ethernet via the rear card VLIA1 111 linked to 100Base-T.

In addition, an ATM wireless unit 113 for interfacing with the control station 220 is provided, and the infrastructure basic card assembly 114 is provided.

This system is connected to ATIA board in 4 blocks of OC-3 or E1 of ADMA block of CDMA2000-1x system control station to transmit / receive data.This system is connected to control station 220 and external public network. ) Will be able to provide call service with regular wired / wireless subscribers.

The system can be used in small areas where subscribers are concentrated, allowing operators to provide the right solution for different types of wireless WLAN systems. And it can process high-speed packet data for Internet service as well as voice service.

The 64 Kbps voice data that arrives from the client to the access point through the wireless section is processed by the IBS controller 110 to the ATM cell format via the control station 220 and the mobile switching center 240. The IBS controller 110 converts the high-speed packet data service from the client into the ATM cell format and transfers it to the control station 220. The packet data transmitted to the control station 220 is connected to the Internet network via the PDSN 250. Is processed.

Next, a wireless LAN network is a wireless network interface card (NIC) installed in each terminal for connecting to another wireless terminal or a wired LAN, an access point serving as a gateway between each terminal and a wired LAN, and a building, a building, or a distributed network. It consists of a wireless bridge device used to connect point-to-point between network segments.

Among them, the access point 130 plays a role similar to that of a LAN hub, and may access and use 205 to 50 terminals simultaneously in an area of about 20 to 150 m in radius per access point. The number of channels that an access point can support is usually 1 to 14 channels. Considering that each client (personal computer connected to the access point) accesses the access point at the same time, there are 15 to 20 client personal computers in one access point. It is reasonable and traffic increases when many clients connect, so you can use multiple channels to distribute the clients. The access point uses 13 channel frequencies, and each channel is interfered with by slightly overlapping with other channels, so adjacent channels should not be used together. For example, when using channel 1, the channels that can be used together should be channels 4, 8, and 12, and have at least 4 intervals apart. If there are a large number of access point installations, maintain at least three intervals.

And it basically has the terminal function, and provides the frame association between each terminal or each cell in one cell as an object that enables access to the distributed system. In addition, the AP provides an association between the terminal and the wired LAN. That is, to perform the IPX / IP routing function and bridging function between the terminal and the wired LAN. In addition, the access point supports a variety of network operating systems (NOS), and provides various functions such as SNMP support and frame filtering in addition to routing and bridging.

Each access point transmits / receives 64Kbps PCM voice signal and high-speed packet data to and from the terminal through the RF module, and a power saving mode that minimizes power consumption when the terminal is not in use should be considered. WEP (Wired Equivalent Privacy) algorithm is used for security. Recently, routers, IP address distribution, and client mobility management and network management functions have been built into the wire and wireless bridge functions.

On the other hand, the wireless network interface card (NIC) 142 includes a power amplifier, a transmission / reception switching switching block, an intermediate frequency / high frequency converter, an I / Q modem processor, a baseband processor, a wireless LAN MAC (MAC) chip, and the like. It consists of five functional blocks, which serve as clients. The memory is interfaced to the Mac chip, and there are firmwares that can process data at high speed. The device contains the firmware and software necessary to implement both protocols so that the central processing unit interfaces with the Mac chip, so that all frame conversion from 802.11b to 802.3 takes place at the access point.

The present invention described above has the effect of sharing a limited service area in one mobile communication system due to different technical features (modem, frequency, access method, etc.).

In addition, by linking to a control station of a CDMA system (CDMA2000-1x, W-CDMA, etc.) that is currently providing or preparing to provide a wireless LAN system, a service required for users in each wireless service area without disconnection in different system areas. The effect is to provide.

Claims (2)

In an interworking device between a control station of a CDMA-2000 system and a wireless LAN, An infrastructure basic service (IBS) controller connected to the control station in a CDMA mobile communication system including a base station, a control station, a control station manager, an exchange, and the like to control access points (APs) of a wireless LAN; A router for determining and forwarding packet paths between the access points; An interworking device between a control station and a wireless LAN (WLAN) of a CD-2000 system, characterized in that it comprises an access point for controlling the traffic flow and access to the clients in the wireless section. The method of claim 1, wherein the infrastructure basic service controller, A processor assembly that performs handoff functions for voice calls and packet data calls between various access points, power control of radio links, and the like, and manages resource management and management functions and system data loading functions for them; A rear card in which high-speed packet data received from each AP passes through a router and is linked to 100Base-T; An ATM wireless unit connected to the control station in an OC-3 manner to interface data wirelessly; Interworking between the control station and the wireless LAN (WLAN) of the CD-2000 system, characterized in that it is connected to the processor assembly and the cell bus, the infrastructure basic card assembly is connected to the rear card to process voice and data Device.