KR20010059946A - Apparatus for interfacing a channel card unit and diagnostic monitor interface unit in a radio port of a wireless local loop system - Google Patents

Abstract

PURPOSE: An interface unit of a channel card board and a channel card monitor board in a WLL(Wireless Local Loop) radio port system, is provided to reduce a load of an RCP(Radio port Control Processor) board, and prevent a load of a main bus from being affected, by making a DMIU(Diagnostic Monitor Interface Unit) board directly interface with CCU(Channel Card Unit) boards. CONSTITUTION: A dummy bus that uses a DMIU board(33) as a mother board is included so that the DMIU board(33) can interface with a plurality of CCU boards(34). When the DMIU board(33) communicates with the CCU boards(34) via the dummy bus, it operates without relation to an RCP(31). The DMIU board(33) collects performance data of the CCU boards(34), and displays the collected performance data on a screen. The DMIU board(33) analyzes collected element monitor data of a channel card, and then optimizes a system parameter.

Description

Apparatus for interfacing a channel card unit and diagnostic monitor interface unit in a radio port of a wireless local loop system}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless local loop (WLL) base station (Radio Port) system, and more particularly, to an interfacing device between a DMIU (Diagnostic Monitor Interface Unit) board and a channel card unit (CCU) board in an RP system. will be.

In general, the WLL system has a merit that it is much better than the radio wave environment of the mobile communication network in terms of use as a communication medium through a wireless channel.

In addition, the line-of-sight environment is secured, and the propagation path loss is about 20 dB / decade, so that it can serve a wider area with the same transmission power. Fading due to multipath is much less than that of point-to-point mobile communication network.

Due to these advantages, the development and research of the WLL system is actively underway, and the accompanying drawings of FIG. 1 show a schematic configuration of a general WLL network having the above advantages.

As shown in Fig. 1, network components include network subscriber station 10, 10 ', subscriber access devices 20, 20', base station 30, 30 ', base station controller 40, WLL switching station ( 50), the base station operating device 60, and the like, and additionally, a data communication matching device 70 (IWF: inter-working function) for data service, a home location register (HLR: home location registration / authentication center) 80 It is composed of

In addition, the billing center 100 connected to the network management sensor 90, the WLL switch 50 and the data communication matching device 70 is connected to the base station operating device 60 and the WLL switch 50 is further provided.

Let us explain the interface between the network components in the WLL system network configured as described above.

The subscriber access devices 20 and 20 'and the base stations 30 and 30' use the standard WLL radio access standard as the access standard, and the channel bandwidth is 10 MHz. The connection standard between the base stations 30 and 30 'and the base station controller 40 selects and uses E1 or HDSL, and the signaling method uses LAPD (Link Access Protocol D).

The base station controller 40 and the WLL switch 50 use E1 as a connection standard and use ITU-T.G965 as a signaling method.

In addition, the connection standard between the base station controller 40 and the base station operating device 60 uses Ethernet, and as a signaling method, Simple Network Management Protocol (SNMP), File Transfer Protocol (FTP), and Telecommunication Network (TELNET). Etc.

On the other hand, the base station controller 40 and the data communication matching device 70 uses E1 as the connection standard, and uses LAPD as the signaling method. In addition, the connection between the WLL switch 50 and the data communication matching device 70 uses E1 as the connection standard and R2 is used as the signaling method.

The connection standard between the WLL switch 50 and the home position register 80 uses E1, and IS-41C is used as the signaling method.

Let's look at the operation of the WLL system network connected through the connection standard and the signaling method in more detail.

First, the base station (30, 30 ') is a base station control module (RCP) that performs the overall management function for one base station, a modem module performing a signal processing function related to the CDMA channel, high power / low noise amplification and transmission and reception frequency conversion function RF module for performing the step, and a line connection module for performing the relay line (E1) connection function for matching with the base station controller 40, amplification of the transmission signal in the RF module, low noise amplification of the received signal, frequency down / up It performs conversion, reception of diversity through two antennas, high power / low noise amplification, and transmission / reception frequency conversion.

In addition, the modem module provides CDMA channels (pilot channel, sync channel, paging channel, access channel, signaling channel, traffic channel, packet traffic channel, packet access channel), digital baseband function processing, CDMA channel coding and decoding related functions. Do this.

The line connection module performs data communication with the base station controller 40 with respect to traffic and control information, and performs a relay line (E1 / HDSL) function for matching the base station controller 40.

The base station controller 40, which controls the base stations 30 and 30 ', is composed of a transcoder module, a call processing module, a switching module, and a matching module. The transcoder module is a 64 Kbps Pulse Code Modulation (PCM) voice coding signal. It includes a transcoder that performs the conversion function, and echo cancellation is implemented. In addition, the call processing module performs various call processing functions such as incoming / outgoing call processing support and message processing of the base station, subsystem status management in the base station controller 40, and control signal format between the WLL switch 50 and the subscriber access device. It is a processor that has a redundant structure for system reliability. The switching module also provides a traffic path between the base station matching device and the transcoder in the base station controller 40.

In addition, the matching module is composed of a WLL switch matching module, a base station matching module and a base station operating device (60) matching module, dual WLL switch (50) matching module for installing the base station controller 40 remotely with the WLL switch (50) If so, perform the E1 / G.965 digital heavy accounting function. In addition, the base station matching module performs the E1 / LAPD, HDSL relay line matching function between the base station and the base station control, and the base station operating device matching module performs the Ethernet / SNMP, FTP, TELNET matching function during the base station operating device-base station control period.

Next, the base station operating device 60 operates the base station controller 40, the base stations 30 and 30 ', and the subscriber access devices 20 and 20', and is responsible for maintenance and repair of each device.

Hereinafter, the base station system in the WLL system will be described.

2 is a diagram illustrating an interfacing structure between a CCU board and a DMIU board in a wireless subscriber network base station system according to the prior art.

As shown in FIG. 2, the bus structure of the conventional base station includes two RCP 31 boards (including a redundant board), which are master boards controlling a base station on a single bus, and two E1RPC 32 boards. The DMIU 33 board, which monitors channel elements of the CCU 34 board and the CCU 34 board, is configured as a slave board. Here, the DMIU board 33 is configured as a slave board. Collects and displays the performance of a plurality of CCU boards 34, that is, channel cards, displays them on a screen, stores them in a storage device, analyzes them, and makes them commercially available for optimizing system parameters. When communicating with the CCU (34) board, under the control of the master board RCP (31) board RCP (31), CCU (34), DMIU (33) and E1RPC (32) board is connected to each one G- Communication takes place via the bus.

Therefore, when the DMIU 33 board is bundled with the slave board, the communication between the DMIU 33 board and the CCU 34 board becomes the communication between the slaves, which is the main controller of the base station and the RCP 31 board which is the G-bus master board. There is a problem that can cause a lot of load.

That is, the DMIU 33 board requiring a large amount of data causes problems in call processing message delivery, which is a main function. In addition, since the slave-to-slave communication is a bus that takes the form of routing from the master, there is a problem of bringing a large load on the RCP 31 board, which is the master board.

Accordingly, the present invention has been made to solve the above-mentioned problems according to the prior art, the object of the present invention is to put another dummy bus having the DMIU board as a master board to directly interface with the CCU boards, It provides an interface between the DMIU board and the CCU board in the WLL base station system that can significantly reduce the load of the RCP board, which is a board, and not affect the load of the main bus at all.

A feature of the interfacing device between the DMIU board and the CCU board in the WLL base station system according to the present invention for achieving the above object is in the WLL base station system having an RCP board, a DMIU board and a CCU board, the master board RCP The main bus is connected between the board and the CCU board, which is the slave board, and the DMIU board is the master board, and the dummy bus is connected between the DMIU board, which is the master board, and the CCU board, which is the slave board. It is to allow communication between slaves.

In another aspect of the present invention, the DMIU board is a HDLC frame and transmits a message to the CCU, a slave board, and analyzes the message received from the CCU board, and provides a CPU to create a 2MHz clock that is a dummy bus clock; ; EPLD which generates frame sync clock and communicates with CCU board, which is slave board, detects that the G-bus clock that is received from CCU, slave board, to DMIU board is distorted and transfers G-bus fail signal to the CPU. Wow; Transmit / receive according to RS-485 communication standard and convert the TTL level data transmitted from the CPU to the differential level and transmit it to the CCU board which is a slave board through the white board, and transmit the differential data transmitted from the CCU board through the back board. Transmitting and receiving unit for converting the level data to the CPU; And a clock generator for supplying a clock for generating a frame sync clock in the EPLD and a clock for checking a dummy bus state to the EPLD.

1 is a block diagram illustrating a general broadband wireless subscriber network system;

2 is a diagram illustrating an interfacing structure between a CCU board and a DMIU board in a wireless subscriber network base station system according to the prior art;

3 is a diagram illustrating an interfacing structure between a CCU board and a DMIU board in a wireless subscriber network base station system according to the present invention;

4 is a block diagram illustrating a detailed block configuration of the DMIU board shown in FIG. 3;

<Explanation of symbols for main parts of drawing>

30: base station 31: base station control unit

32: RPC 33: DMIU

33a: CPU 33b: EPLD

33c: clock generator 33d: transceiver

34: CCU

Hereinafter, an interfacing device between a DMIU board and a CCU board in a WLL base station system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram illustrating an interfacing structure between a CCU board and a DMIU board in a wireless subscriber network base station system according to the present invention, and FIG. 4 is a detailed block diagram of the DMIU board shown in FIG. 3.

As shown in FIG. 3, the present invention is configured so that the DMIU 33 board and the CCU 34 board interface by configuring one more dummy bus including the DMIU 33 board as a master board.

That is, the DMIU 33 board communicates with a plurality of CCU 34 boards through a derby bus. In this case, the DMIU 33 board performs direct communication regardless of the RCP 31 to collect the performance of the plurality of CCU 34 boards. It displays the collected performances on the screen, analyzes the element monitoring data of the collected channel card, and then uses it for the optimization of system parameters.

As a result, since the dummy bus having the DMIU 33 board as the master board communicates with the CCU 34 directly, the load on the RCP 31 board can be reduced, and the amount of data on the main bus can be significantly reduced. It is. That is, all communication in the base station proceeds to communication between the master and the slave, and it is possible to reduce the load on the RCP 31 board, which is the main controller caused by the communication between the slave and the slave as in the prior art.

In order to achieve such an effect, the DMIU 33 board has a configuration as shown in FIG. 4.

That is, as shown in FIG. 4, the DMIU 33 board, which is a master board, is composed of a CPU 33a, an EPLD 33b, a clock generator 33c, and a transceiver 33d.

The CPU 33a creates a High-Level Data Link Control (HDLC) frame and transmits a message to the CCU 34 which is a slave board through the transceiver 33d, and transmits and receives a message through the transceiver 33d at the CCU 34 board. Analyze the received message. In addition, it functions as a main processor by generating a 2MHz clock, which is a G-bus clock.

In addition, the EPLD 33d generates a frame sync clock (1.25MHz) to be used for communication with the CCU 34, which is a slave board, and receives a reference clock and receives the reference clock from the CCU 34, which is a slave board, to the DMIU 33 board. The bus clock is sensed and the G-bus fail signal is transmitted to the CPU 33a.

Transmitting and receiving unit 33d transmits and receives by RS-485 communication standard, converts TTL level data transmitted from CPU 33a to differential level, and transmits to CCU 34 board, which is a slave board, through a white board. In other words, the differential data transmitted from the CCU 34 board through the back board is converted into data of the TTL level and transmitted to the CPU 33a.

On the other hand, the clock generator 33c supplies the EPLD 33b with a 10 MHz clock and a 16 MHz clock for checking the G bus state so as to generate a frame sync clock (1.25 MHz) in the EPLD 33b.

As a result, in the present invention, the bus structure in the base station of the existing WLL system is a G bus structure, which is inevitably performed through the RCP 31 board, which is a master board, for slave-to-slave communication. In other words, the master board functions as a kind of router to communicate. In this form, adding a DMIU (33) board, which is a slave board that requires a lot of data at all times, causes a problem that the existing bus is loaded and the master board is loaded.

However, as in the present invention, if the bus is configured by setting one more dummy bus including the DMIU 33 board as the master board, the load on the master board and the main bus can be significantly reduced.

The interfacing device between the CCU board and the DMIU board in the WLL base station system according to the present invention as described above has a dummy bus having the DMIU board as a master board so as to perform communication with the CCU board. It proceeds with communication between slaves, and can reduce the load on the main controller board caused by the communication between slaves and because the data between the DMIU board and the CCU board, which requires a lot of data at all times, does not load the main bus. There is an advantage that the bus operation can be performed efficiently.

Claims (2)

In a WLL base station system having an RCP board, a DMIU board, and a CCU board, Connect between the master board RCP board and slave board CCU board by the main bus, The DMIU board is a master board, and the DMIU board in the WLL base station system is configured to connect the master board and the DMIU board, which is a master board, and the slave board, by using a dummy bus so that all communication in the base station is performed between the master and the slave. Interfacing device between CCU boards. The method of claim 1, The DMIU board comprises: a CPU for making an HDLC frame, transmitting a message to the CCU, which is a slave board, analyzing a message received from the CCU board, and making and providing a 2 MHz clock which is a dummy bus clock; EPLD which generates frame sync clock and communicates with CCU board, which is slave board, detects that the G-bus clock that is received from CCU, slave board, to DMIU board is distorted and transfers G-bus fail signal to the CPU. Wow; Transmit / receive according to RS-485 communication standard and convert the TTL level data transmitted from the CPU to the differential level and transmit it to the CCU board which is a slave board through the white board, and transmit the differential data transmitted from the CCU board through the back board. Transmitting and receiving unit for converting the level data to the CPU; And a clock generator for supplying a clock for generating a frame sync clock in the EPLD and a clock for checking a dummy bus state to the EPLD.