KR20010065928A - apparatus for supplying power of backboard in a radio port of a wireless local loop system - Google Patents

Abstract

PURPOSE: An apparatus for supplying a power to a backboard in a radio port of a WLL is provided to prevent that entire voltages of signals in a G-bus are dropped when performing an IPC(Inter Processor Communication) by mounting a specific power supply board for supplying the power of the IPC and directly supplying the power supply voltage(VCC) with 5V. CONSTITUTION: A -48V and a -48V GND are supplied to a GPDA1(G-bus Power Daughter Assembly 1)(118) and a GPDA2(118), respectively. The GPDA1(118) and the GPDA2(118) convert the 48V and the -48V GND into the power supply voltage(VCC) with 5V in an internal DC/DC converter and supply the power supply voltage(VCC) to an E1RPC(E1 interface Radio Port Control unit)(111), an RCP(RP Control Processor Unit)(112), and an RDU(RP Reference Clock Distribution Unit)(113) through a backboard.

Description

Apparatus for supplying power of backboard 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 backboard of a wireless local loop (WLL) base station (Radio Port) system, and more particularly, to supply operating power to a plurality of boards through a backboard, and to supply power required for IPC communication. An apparatus for supplying power to a backboard in a WLL base station system is provided.

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), a 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 Resister / Authentication Center) ( 80).

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, synchronization 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, a description will be given of the back board mounted with each board in the base station system in the WLL system.

2 is a mounting diagram of a backboard in a wireless subscriber network base station system according to the prior art, the backboard 110 has two redundant E1 RPCs 11, two redundant RCPs 112, redundant RDUs 113, and connectors. (CHAMP1) 116, a plurality of power ports (P1 to P6) 115, a plurality of serial ports (S1, S2, S3) 114 and a clock supply unit (A1) 117 are mounted.

Here, the RCP (RP Control Processor Unit) 112 has a function of performing call processing of the base station and switching of each traffic data (1024 × 1024), and collecting and reporting actual board information of each board and reporting them to a higher level. Perform. In addition, it has a master function to control IPC communication during IPC communication in the base station and has a redundant structure.

The E1 Interface Radio Port Control Unit (E1RPC) 111 performs a function of interfacing with the base station controller, matches the base station controller with E1, and performs an 8 Mbps Highway interface with the RCP 112.

The RP Reference Clock Distribution Unit (RDU) 113 is a board for generating and distributing baseband clocks and network synchronizer clocks necessary for a base station, and has a redundancy structure.

The clock generator 117, that is, the A1 port, is an analog sine wave clock provided by the RDU 113 to supply the system clock of the RF stage. The connector 116, that is, the CHAMP1 slot, is connected between the base station controller and the base station E1 link. In this slot, a signal of 2.048Mbps is connected to this CHAMP1 connector and transmitted to the E1RPC (111) board through the back board.

In addition, S1 and S2 of the serial port 114 is a port for monitoring the status information of the RF stage in the RCP (112) board is a port for RS-232 serial communication, S3 of the serial port 114 The port is for environmental monitoring of base station and is for RS-232 serial communication. Through this, the RCP 112 communicates with the environmental monitoring device to transmit the environmental monitoring information of the base station to the higher, that is, the operator.

In addition, the power ports P1 to P6 115 receive -48V and -48V GND from a rectifier (not shown), and supply operating power to respective boards. Each board uses -48 V to provide the necessary power through the DC / DC converters on each board. At this time, P1 port is -48V, P2 port is -48V GND, P3 port is for frame GND-static prevention, P4 port is VCC, P5 port is GND, and P6 port is 48V GND port.

As a result, the backboard is a control backboard of the base station, which is designed to provide a large power supply and cabling for interfacing with a rack (base station controller) and to provide local functions of the functional boards, as shown in FIG. 2. As shown in the figure, six slots (2 E1 RPCs, 2 RCPs, and 2 RDUs) for mounting a function board are mounted, and one port (A1) for supplying an analog clock to the RF stage, a base station controller, One port (CHAMP1: 8E1 total) to perform the interface, two RS-232 serial ports (S1, S2) for sending and receiving RF and status information, one RS-232 port (S3) for environmental equipment and power from the rectifier Six supply ports P1 to P6 are mounted.

The back board in the WLL base station system is an IPC communication, which is a board-to-board communication of functional boards mounted in the back board, and performs board-to-board communication according to the RS-485 standard communication method called G-bus. Power was supplied from a specific board called RCP. However, when powering the RCP Et backboard, a diode was added to the board to prevent reverse voltage. Therefore, there is a problem that a voltage drop of 0.7 V of the diode occurs, causing the voltages of the signals on the G-bus to drop as a whole.

In addition, the authority transfer from the active board to the standby board at the time of switching of the board that requires a redundant transfer, there is a problem that the data is lost instantaneously due to the slow transfer speed.

Accordingly, the present invention has been made to solve the above problems according to the prior art, an object of the present invention is to mount a separate power supply board for supplying the power of the IPC communication to supply the VCC power of 5V directly. The present invention provides an apparatus for supplying power to a backboard in a wireless subscriber network base station system.

A feature of an apparatus for supplying power to a backboard in a wireless subscriber network base station system according to the present invention for achieving the above object is that in the backboard of a WLL base station system equipped with a plurality of boards, which is input through an external rectifier After converting a voltage of -48V to VCC 5V, a power supply board for supplying each board to the board through the back board is mounted on the back board to obtain the RS-4865 signal level of the IPC TX and RX signals flowing on the back board.

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

2 is a mounting diagram of a backboard in a wireless subscriber network base station system according to the prior art;

3 is a view showing a form of a back board mounted with an apparatus for supplying power to a back board in a wireless subscriber network base station system according to the present invention;

4 is a view showing a signal flow powered by an apparatus for supplying power to a backboard in a wireless subscriber network base station system according to the present invention;

5 is a view showing the form of the connector of the backboard is equipped with a device for supplying power to the backboard in the wireless subscriber network base station system according to the present invention,

6 is a view illustrating a signal flow through a back board equipped with a device for supplying power to the back board in a wireless subscriber network base station system according to the present invention.

<Explanation of symbols for main parts of drawing>

110: backboard 111: E1RPC

112: RCP 113: RDU

114: serial port 115: power port

116: connector 117: clock supply

118: GDPA

Hereinafter, an apparatus for supplying power to a backboard in a wireless subscriber network 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 a form of a backboard on which a device for supplying power to a backboard is mounted in a wireless subscriber network base station system according to the present invention. FIG. Let's skip and explain only the additional components.

That is, the present invention performs the communication between the boards according to the RS-485 standard communication method called G-bus from the backboard 110 to IPC communication, which is the board-to-board communication, in which the level voltage of the signal is specified as RCP mounted on the backboard. G-Bus Power Daughtor Assembly (GPDA1, 2), which supplies VCC power during IPC communication without supplying power from the board and mounting a separate diode to prevent reverse voltage. It is implemented. Here, GPDA1 and 2 118 receive -48V from the rectifier and supply power supplying the level of RS-48 signal of IPC TX, RX signal flowing VCC 5V to the backboard.

4 is a signal flow diagram of a power supplied by an apparatus for supplying power to a backboard in a wireless subscriber network base station system according to the present invention. That is, FIG. 4 is a power supply flowchart of the GPDA 118 board multiplying the concept of a signal for IPC communication between the boards in the back board 110 and a power supply for holding the level of the signal.

IPC can have a total of 32 TX and RX nodes, and it is a communication based on RS-485 standard for serial communication at up to 10Mbps.

When power is supplied from each functional board, a diode must be attached to prevent the reverse voltage so as not to be affected by the board. Since the voltage drop is caused by the diode, the GPDA board 118 supplies power while preventing the voltage drop. It is designed.

In FIG. 4, -48V and -48V GND input from the rectifier are supplied to GPDA1 and 2 (118), respectively, and GPDA1 and 2 (118) are supplied with internally mounted DC / DC signals of -48V and -48V GND. The converter converts VCC to 5V and supplies it as a backboard signal to supply to each board, that is, the E1RPC 111, the RCP 112, and the RDU 113 through the backboard.

FIG. 5 is a view illustrating a form of a connector of a back board equipped with a device for supplying power to a back board in a wireless subscriber network base station system according to the present invention, wherein a signal of a back board signal is referred to as FMLB (First-Mate Last-Break). The height of the connector is adjusted according to the characteristics. First, -48V_GND, GND, frame GND, redundancy signal should touch the board first, then GND, -48V_GND touch, and then general signal touch the board. will be.

It is designed to communicate with other boards by sending signals to the back board after power is supplied at the time of mounting. However, the frame GND absorbs the static electricity of the board at the time of mounting on the back board and the rack of the base station to reduce the malfunction as much as possible.

The redundancy signal is to reduce the loss of data to the maximum with a quick switchover when the redundant switchover is required when the boards (RCP, RDU) performing the redundancy switchover are sealed or dismounted.

FIG. 6 is a diagram illustrating a signal flow through a back board equipped with a device for supplying power to a back board in a wireless subscriber network base station system according to the present invention. The E1 signal between the base station controller 40 and the base station is shown in FIG. It is connected through the illustrated CHAMP 116 port and connected to the E1 RPC 111 through the E1 path of FIG. 6, and this E1 signal is transmitted as a bit rate of 2.048 Mbps +/- 50 ppm and a PCM (Pulse Code Modulation) signal of HDB3. . Through this, the subscriber's voice signal, general data, and call processing signal are transmitted to the base station.

Up to 8E1 can be connected to the backboard. The IPC path communicates data for call processing and status information for the status of each board. The main control of the IPC is performed by the RCP 112. This IPC has a throughput of up to 10Mbps. The highway has a transmission rate of 8 Mbps in a transmission / reception path of PCM voice and ADPCM general data coded and decoded by a CDMA method on a channel card through a wireless path at a subscriber terminal. This means that four E1s of 2.049 Mbps are aggregated into one highway of 8 Mbps.

In addition, 16.384MHz clock and 8KHz synchronization pulse are supplied from the RDU 113, which supplies the clock for system synchronization of the entire base station system through the backboard, and the RCP 112 and the E1RPC 111 are divided. Thus, each board will synchronize its data to this clock.

The apparatus for supplying power to the backboard in the wireless subscriber network base station system according to the present invention as described above by mounting a separate power supply board for supplying the power of the IPC communication to supply VCC power of 5V directly, In IPC communication, there is an advantage that the total voltage of signals on the G-bus can be prevented from dropping.

Claims (2)

In the backboard of a WLL base station system equipped with a plurality of boards, After converting the voltage of -48V input through external rectifier to VCC 5V, supply the power supply board to each board through the back board to grab the RS-4865 signal level of IPC TX and RX signals flowing to the back board. The apparatus for supplying power to the backboard in the wireless subscriber network base station system, characterized in that mounted on the backboard. The method of claim 1, The power supply board is a device for supplying power to the backboard in a wireless subscriber network base station system, characterized in that it comprises a DC / DC converter for converting the -48V power input from the rectifier to VCC 5V.