KR100353800B1 - Apparatus for duplexing E1 interface board of radio port and radio port controller in wireless local loop system and method for switching E1 interface board - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a base station and a base station control period E1 interface board duplication apparatus and a duplication switching method using the same in a wireless subscriber network system.

2. The technical problem to be solved by the invention

According to the present invention, after connecting one E1 link to two master / slave PBAs, the master board operates first, and the master board instantly switches to a slave board in case of error, thereby minimizing service interruption. To provide a base station and base station control period E1 interface board redundancy device and a redundancy switching method using the same in the WLL system.

3. Summary of Solution to Invention

The present invention is a base station and base station control period E1 matching device of a wireless subscriber network (WLL) system, comprising: a master E1 matching board for E1 matching between the base station and the base station controller and the master E1 matching board when an error occurs in the master E1 matching board. A slave E1 matching board for performing E1 matching between a base station and the base station controller is provided at the base station and the base station controller, respectively, and the master and slave E1 matching boards are respectively disabled according to switching control signals provided. First and second relays respectively provided at the transmit / receive (TX / RX) side; And detecting an error in one E1 matching device, providing a switching control signal for disabling the first and second relays in the event of an error, and transmitting a switching signal to the other E1 matching board, and transmitting the signal from the other E1 matching board. And control means for enabling the first and second relays to perform an E1 matching operation when an error occurs and a transfer request signal is received from the other E1 matching board.

4. Important uses of the invention

The present invention is used in a wireless subscriber network (WLL) system.

Description

Apparatus for duplexing E1 interface board of radio port and radio port controller in wireless local loop system and method for switching E1 interface board}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless local loop (WLL) system, and more particularly to an E1 interface board duplexing device capable of implementing an uninterrupted service when an error occurs in an E1 matching device between a base station and a base station controller in a WLL system. It relates to a redundant transfer method used.

In general, the WLL system has an advantage that it is much better than the propagation 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, so that the propagation path loss is 20dB / decade, so that it can serve a wider area with the same transmission power. There is an advantage that fading due to multipath is much less than the propagation environment of mobile communication network.

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

As shown in FIG. 1, network components of a WLL system include network subscriber stations 10 and 10 ′, subscriber access units 20 and 20 ′, base stations 30 and 30 ′, base station controller 40, WLL switching center 50, base station operating device 60, and the like, additionally, data communication matching device 70 (IWF: inter-working function) for data service, home location register (HLR: Home Location Register / Authentication) Center 80.

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

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

The subscriber access devices 20 and 20 'and the base stations 30 and 30' use a standard WLL radio access standard as a connection 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 (High bit rate Digital Subscriber Line), and the signaling method uses Link Access Protocol D (LAPD).

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), TELNET (Telecommunication Network), etc. Use

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 WLL switch 50 and the data communication matching device 70 use E1 as a connection standard, and R2 is used as a 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.

The operation of the WLL system connected through the connection standard and signaling method will be described 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 that performs the signal processing function related to the Code Division Multiple Access (CDMA) channel, high power / low noise RF (Radio Frequency) module performing the amplification and transmission and reception frequency conversion function, and a line connection module performing a relay line (E1) connection function for matching with the base station controller 40, amplification of the transmission signal in the RF module, It performs low noise amplification of received signal, frequency down / up conversion, diversity reception 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 for 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 encoding signal. It includes a transcoder that performs the conversion function, and echo cancellation is implemented. In addition, the call processing module supports various call processing functions such as incoming / outgoing call processing support and message processing of the base stations 30 and 30 ', subsystem status management in the base station controller 40, and the WLL switch 50 and the subscriber access device 20, 20 ') is a processor that performs functions such as control signal format and has a redundancy structure for system reliability. In addition, the switching module 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 matching module, the double WLL switch matching module is installed when the base station controller 40 and the WLL switch 50 remotely E1 / G. 965 Performs the digital middle account function. In addition, the base station matching module performs an E1 / LAPD, HDSL relay line matching function between the base stations 30 and 30 'and the base station controller 40, and the base station operating device matching module is the base station operating device 60 and the base station controller 40. It performs Ethernet / SNMP, FTP, and TELNET matching function.

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.

As described above, the connection medium between the base station 30, 30 'and the base station controller 40 in the WLL system is implemented as an E1 link, and is provided between the base station 30, 30' and the base station controller 40. The number of E1 links to be defined is 2E1.

Currently, the subscriber capacity provided by the base stations 30 and 30 'is about 30 to 60 channels, and if the base station capacity is further increased to advance to 2FA / 3 sectors, more E1 dedicated lines will be needed. However, it is difficult to rush to E1 leased line if subscribers suddenly increase because subscribers are expected to develop to 2FA / 3 sector capacity on initial cell plain and do not preempt E1 leased line first.

Conventional CDMA or PCS systems have adopted the E1 transmission scheme, but do not use the optical transmission scheme. The commercialized part of the wireless optical transmission system is the optical repeater of PCS / CDMA, which is installed in the shaded areas where the base station radio waves are not transmitted well, and the base station RF frequency is directly loaded on the light and transmitted. After modulating to the RF frequency again, it has never been used as a transmission method between the base stations 30 and 30 'and the base station controller 40 to cover the shadow area.

In addition, E1 link is currently provided through HDSL or Fiber Loop Carrier (FLC) system without directly providing E1 dedicated line. As the capacity of E1 dedicated line increases, the size of HDSL or FLC system to be installed in telephone company will be increased. .

FIG. 2 is a conceptual diagram of a base station and base station control period E1 link connection in a wireless subscriber network (WLL) system according to the prior art. Referring to FIG. 2, a brief description of a base station and base station control period matching apparatus of a conventional WLL system will be given below. By linking the base stations 30 and 30 'with the base station controllers 40 and 40' via the E1 link, it is very expensive to newly provide a new E1 dedicated line in all regions requiring the base stations 30 and 30 '. Recently, it is using HDSL equipment or FLC system that can provide speed and transmission characteristics of 2.048M provided by E1 dedicated line. This is provided by using existing lines by using existing 2W analog lines and wired optical lines.

As shown in FIG. 2, the base station 30, 30 ′ and the base station controller 40, 40 ′ are equipped with an E1 matching device for E1 matching, respectively. An E1 matching device for E1 matching to each of the base stations 30 and 30 'and the base station controllers 40 and 40' will be described with reference to FIG. 3.

3 is a detailed configuration diagram of an E1 matching device provided in a base station and a base station controller in a conventional WLL system.

As shown in FIG. 3, an E1 line interface transformer 110 is an apparatus for adjusting the electrical characteristics of E1, which is a physical connection method between a base station and a base station controller (HDB3 Level). The E1 Framer And Tranceiver 111 is a device that transmits and receives an E1 frame, and the clock synchronizer 112 checks, recovers, and synchronizes an error of an input E1 frame.

The HDLC array 113 is a control for processing LAPD between E1 frames, and the time switch 114 is a device that directly performs subchannels in the matching device, and the CPU 120 The call processing and control information extracted from the HDLC array 113 is analyzed, the information is sent to the upper control unit through the parallel bus control unit 121, the information of the input data is analyzed, and the sub-switching information is received for the time. To control the switch 114.

EPLD (Erasable Programmable Logic Device) 119 is a Programmable Logic Device (PLD) that handles various clocks or decoders / interrupts used internally, and Read Only Memory (ROM) 118 is a board on board power-on. The software for activating the software is mounted, and the flash ROM 116 is used as a storage location for variables in the calculation when application software is loaded and used. In addition, a serial input / output port 115 is provided.

As such, the connection medium between the base station and the base station controller in the conventional WLL system is implemented with an E1 link, and the number of E1 links provided for the base station and the base station control period is defined as 2E1. If the actual number of E1 links (when the number of E1 links per board is less than the number of E1 links provided) and the packet data transmission method are used, even if the speed drops to some extent without any service interruption in the event of link error or matching board (PBA) error Provide the subscriber with the services of the base station. However, because the standard provides only E1 link of about 2E1 per base station, and current capacity of E1 matching board is about 4E1 to 8E1, after connecting this 2E1 to one board, if a board error occurs, replace it. Previously, there was a problem that it was difficult to provide a service.

As a result, since the E1 transmission method according to the prior art mostly uses the packet data method, it is possible to transmit data and information even though the transmission speed decreases to some extent before all connected E1 links are completely disconnected.

In addition, the channel is controlled by the internal main switch, but the channelized method is used in the WLL system. Therefore, it is impossible to control the channel once occupied and the link provided is one board. If a board error occurs when the service is connected to all of them, there is a problem that can not provide services of all subscribers connected to the base station.

Therefore, the present invention has been proposed to solve the above-mentioned problems according to the prior art, and after connecting one E1 link to two Master / Slave PBAs, the master board operates first. The purpose of the present invention is to provide a base station and base station control period E1 interface board duplication apparatus and a duplication switching method using the same in a WLL system for minimizing service interruption by minimizing service interruption to a slave board in the event of an error.

1 is a block diagram of a general broadband wireless subscriber network system.

2 is a conceptual diagram of a base station and base station control period E1 link connection in a wireless subscriber network (WLL) system according to the prior art;

3 is a detailed configuration diagram of an E1 matching device provided in a base station and a base station controller in a wireless subscriber network (WLL) system according to the prior art.

Figure 4 is a configuration diagram of a base station and base station control period E1 interface board redundancy device in a wireless subscriber network (WLL) system according to the present invention.

5A and 5B are flowcharts illustrating an embodiment of a redundancy switching method using a base station and a base station control period E1 interface board duplication apparatus in a wireless subscriber network system (WLL) according to the present invention.

* Explanation of symbols for main parts of the drawings

200: master E1 matching board 201,211: memory

202,212: CPU 203,213: first relay

204,214: E1 primer 205,215: High speed interface unit

206,216: second relay

In accordance with another aspect of the present invention, there is provided a base station and base station control period E1 matching device of a wireless subscriber network (WLL) system, the master E1 matching board for matching E1 between the base station and the base station controller, and the master E1. Switching E1 matching boards are provided on the base station and the base station controller, respectively, for performing E1 matching between the base station and the base station controller when an error occurs in the matching board, respectively, provided for each of the master and slave E1 matching boards. First and second relays each provided on a transmission / reception (TX / RX) side, each of which is disabled / enabled according to a signal; And detecting an error in one E1 matching device, providing a switching control signal for disabling the first and second relays in the event of an error, and transmitting a switching signal to the other E1 matching board, and transmitting the signal from the other E1 matching board. And a control means for controlling the E1 matching operation to be performed by enabling the first and second relays when an error occurs and the transfer request signal is received from the other E1 matching board. In the method of redundant switching of the E1 interface between a base station and a base station controller of a WLL system having a master E1 matching board and a slave E1 matching board each having a plurality of relays, the master E1 matching board is driven when the master E1 matching board is driven. After initializing chips in the board, enable a plurality of relays in the master E1 matching board to perform E1 matching operation normally. The first step; Detecting an error of the master E1 matching board; A third step of disabling the plurality of relays and transmitting a switching signal to the slave E1 matching board when an error of the master E1 matching board occurs; A fourth step of, when the transfer signal is received from the master E1 matching board, enabling the slave E1 matching board to enable E1 matching operation between the base station and the base station controller by enabling a plurality of relays in the slave board; A fifth step of detecting, by the slave E1 matching board, whether an error occurs in its own board; A sixth step of disabling a plurality of relays in the own board and transmitting a switching signal to the master E1 matching board when an error of the slave E1 matching board occurs; And a seventh step in which, when the transfer signal is received from the slave E1 matching board, the master E1 matching board enables a plurality of relays in the master board to perform an E1 matching operation between the base station and the base station controller. The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram of an embodiment of a base station and base station control period E1 interface board redundancy device in a wireless subscriber network (WLL) system according to the present invention. That is, the detailed block structure of the E1 interface matching device which has a redundancy structure using a relay is shown. The detailed function is as follows.

First, referring to the master E1 matching board (PBA) 200 of FIG. 4, the basic configuration of the redundant board is the same as FIG. 3, and the difference is that the first and second relays 203 and 206 are additionally configured. The CPU 202 of 200 and the CPU 212 of the slave E1 matching board (PBA) 210 is connected to the hardware so as to transmit and receive signals.

First, the basic prerequisite for redundancy is, firstly, the exchange of redundancy switching signals, which is between the CPU (202, 212) of the master E1 matching board 200 and the slave E1 matching board 210, which makes the final decision of the matching board. It means that the transfer signal should be connected, and secondly, the slave E1 matching board 210 should not have any influence on the signal input / output to the outside.

Third, various input / output signals that are switched from the master E1 matching board 200 to the slave E1 matching board 210 do not affect the outside when the transfer signal is transferred between the CPUs 202 and 212 of the master and slave E1 matching boards 200 and 210. This should be controlled. Therefore, the present invention is designed to satisfy the above basic conditions, and in order to implement this, detailed blocks "a", "b", "c", "d", and "e" are configured as shown in FIG. Details of this are as follows.

Block "a" of the master E1 matching board 200 of Figure 4 and "d" block of the slave E1 matching board 210 is a block that substantially connects and duplicates the E1 link in each board (200, 210), E1 Framers 204 and 214 are identical to the functions of the El framer and transceiver shown in FIG.

The function of the first relays 203 and 213 is a chip having an on / off function of an input / output E1 signal. Here, although there are various things that can be used instead of the first relays 203 and 213, since there are not many chips that directly turn on and off the differential level electrical E1 signal, the electrical signals of the direct differential level are simply turned on. The relay can be turned on and off.

Originally, both TX / RX side should be used, but when used in RX part, slave E1 matching board 210 has not installed because it forgets E1 sync and cannot synchronize E1 frame. It is omitted because it is necessary to know the control signal inputted by the LAPD process on channel 1.

In addition, the "b" block of the master E1 matching board 200 and the "e" block of the slave E1 matching board 210 are blocks for implementing redundancy for highways in the system, the same as the block "a". The second relays 206 and 216 were added only to the TX unit. The reason why the relays 203, 206, 213, and 216 are installed only in the TX part in the blocks "a", "b", and "d" and "e" blocks is that the RX part receives an actual signal and is not an external influence part. This is because the other side should not have any effect when one side is in operation.

The " c " block between the master E1 matching board 200 and the slave E1 matching board 210 is a redundant structure, which transmits and receives a redundant transfer signal between the CPUs 202 and 212, and also relays 203, 206, 213 and 216 connected to the respective chips. ) On / off.

First, when the master E1 matching board 200 is switched to the slave E1 matching board 210, all of the first and second relays 203 and 206 in the master E1 matching board 200 are disabled, and the slave E1 matching board 200 is disabled. The first and second relays 213 and 216 in the 210 may be enabled. These may be individually enabled / disabled by software. However, when implemented in hardware, the first and second relays 203 and 206 in the master E1 matching board 200 are not only fast but also suddenly down when the CPUs 202 and 212 are suddenly down. This may be a hardware implementation because it may not be possible to disable.

Hereinafter, a redundant switching method using a base station and a base station control period E1 interface board duplication apparatus in a WLL system according to the present invention will be described step by step with reference to the accompanying drawings.

FIG. 5 is a flowchart illustrating a redundant switching method using a base station and a base station control period E1 interface board duplication apparatus in a wireless subscriber network system (WLL) according to the present invention. FIG. 5a shows a slave E1 when an error occurs in a master E1 matching board. FIG. 5B is a flowchart illustrating a method of switching to a master E1 matching board when an error occurs in the slave E1 matching board.

First, a redundant switching method from the master E1 matching board to the slave E1 matching board will be described with reference to FIG. 5A.

First, the power of the master E1 matching board is turned on (S101), and each chip is activated (S102).

Thereafter, the first and second relays 203 and 206 in the master E1 matching board 200 are enabled (S103), and the master E1 matching board 200 is normally operated (S104). At this time, error information is often received (S104).

Next, it is determined whether the master E1 matching board 200 is operating normally (S105), and when the master E1 matching board 200 does not operate normally (that is, an error occurs in the master E1 matching board 200). Case), after the CPU 202 in the master E1 matching board 200 receives the error, it is analyzed whether the matching board should be transferred to the slave E1 matching board 210 (S106).

As a result of the analysis, when switching to the slave E1 matching board 210 is required, a transfer request signal is sent to the CPU 212 of the slave E1 matching board 210 (S107), and the first in the master E1 matching board 200 is transferred. , 2 relay (203, 206) is disabled (S108). That is, it blocks all the inputs and outputs.

Then, the CPU 202 of the master E1 matching board 200 transmits the error occurrence alarm information to the upper control unit (S109), and switches to the slave E1 matching board 210 in an operating state (S110).

In the slave E1 matching board 210 operation state, it is determined whether the transfer signal is received from the CPU 212 of the slave E1 matching board 200 in the CPU 202 of the master E1 matching board 200 (S111), and the switching signal. If it is not received, and continues to operate as a slave E1 matching board 210, when receiving a transfer signal to the step S103 to feed back the first and second relays (203, 206) in the master E1 matching board (200) Able to switch to the master E1 registration board (200).

On the other hand, referring to Figure 5b will be described with respect to the switching operation to the master E1 matching board 200 when an error occurs in the slave E1 matching board 210.

First, the power of the slave E1 matching board 210 is turned on (S201), and each chip is activated (S202).

Thereafter, the first and second relays 203 and 206 in the slave E1 matching board 210 are disabled (S203) and operated in a slave state (S204). That is, only the analysis of the input LAPD information and IPC information analysis is performed, and the analyzed result is not transmitted.

Subsequently, it is determined whether the transfer request signal is received from the CPU 202 of the master E1 registration board 200 (S205), and when the transfer request signal is received from the CPU 202 of the master E1 registration board 200, the slave E1 is received. The first and second relays 213 and 216 in the matching board 210 are enabled (S206 and S207), respectively, so that the slave E1 matching board 210 is normally operated (S208).

Next, by analyzing whether the slave E1 matching board 210 is operating normally (S209), when the slave E1 matching board 210 does not operate normally (that is, an error occurs in the slave E1 matching board 210). In the case), after the CPU 212 in the slave E1 matching board 201 receives an error, it is checked whether the matching board should be transferred to the master E1 matching board 200 (S210).

As a result of the inspection, when the transfer to the master E1 registration board 200 is required, the transfer request signal is transmitted to the CPU 202 of the master E1 registration board 200 (S211), and the first, 2 relays (213, 216) are both disabled (S212). That is, it blocks all the inputs and outputs.

Then, the CPU 212 of the slave E1 matching board 210 transmits the error occurrence alarm information to the upper controller (S213).

As a result, in the redundant switching method using the base station and base station control period E1 interface board redundancy device in the WLL system according to the present invention, once the master E1 matching board 200 is driven, basic chips are once initialized, and the master E1 matching board 200 is used. Both of the first and second relays 203 and 206 are enabled to perform normal operation.

When an error in the master E1 matching board 200 is detected by the CPU 202 in the master E1 matching board 200, the CPU 202 of the master E1 matching board 200 determines this, and further E1 matching device is detected. If it is determined that it is difficult to perform the function, the slave E1 matching board (210) while sending the switching signal to the slave E1 matching board (210) while disabling all the first and second relays (203, 206) in the master E1 matching board (200) At the same time as the first and second relays 213 and 216 are enabled, the CPU 202 of the master E1 matching board 200 reports the error occurrence information as higher. In this case, when the CPU 202 of the master E1 matching board 200 is down, there is no time to judge in software. Therefore, it is necessary to connect to the CPU fault signal in hardware so that the transfer signal can go. The present invention is not limited to the above-described embodiments and the accompanying drawings, and it is common knowledge in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

As described above, the present invention provides a stable service by switching a base station and a base station control period E1 matching board in a WLL system to a redundant board without interruption of service in the event of a board error or CPU failure. There is an effect that can be provided.

In addition, although the board is added due to redundancy, an error in the E1 processing board between the base station and the base station controller of the WLL system causes a service interruption for the time required to replace it. In particular, since the number of E1 links cannot be bypassed and transmitted, redundancy enables stable service without interruption, no need for urgent replacement personnel, and reduced number of replacement boards for replacement. have.

Claims (5)

delete delete In the base station and base station control period E1 matching device of a wireless subscriber network (WLL) system, A master E1 matching board for E1 matching between the base station and the base station controller, and a slave E1 matching board for performing E1 matching between the base station and the base station controller when an error occurs in the master E1 matching board. Each one on the controller side, Each of the master and slave E1 registration boards, First and second relays each provided on a transmission / reception (TX / RX) side, each of which is disabled / enabled according to a switching control signal provided; And After detecting an error in one E1 matching device, providing a switching control signal for disabling the first and second relays in the event of an error, transmitting a switching signal to another E1 matching board, and transmitting an error in the other E1 matching board. Control means for controlling the E1 matching operation to be performed by enabling the first and second relays when a change request signal is received from the other E1 matching board. In the wireless subscriber network system comprising a base station and a base station control period E1 interface board duplication apparatus and duplication switching method using the same. delete In the E1 interface redundancy switching method between the base station and the base station controller of the WLL system having a master E1 matching board and a slave E1 matching board each having a plurality of relays, A first step of initializing chips in the master E1 matching board when the master E1 matching board is driven, and then enabling a plurality of relays in the master E1 matching board to normally perform an E1 matching operation; Detecting an error of the master E1 matching board; A third step of disabling the plurality of relays and transmitting a switching signal to the slave E1 matching board when an error of the master E1 matching board occurs; A fourth step of, when the transfer signal is received from the master E1 matching board, enabling the slave E1 matching board to enable E1 matching operation between the base station and the base station controller by enabling a plurality of relays in the slave board; A fifth step of detecting, by the slave E1 matching board, whether an error occurs in its own board; A sixth step of disabling a plurality of relays in the own board and transmitting a switching signal to the master E1 matching board when an error of the slave E1 matching board occurs; And When a transfer signal is received from the slave E1 matching board, the master E1 matching board enables a plurality of relays in the master board to perform an E1 matching operation between the base station and the base station controller; In the wireless subscriber network system comprising a base station and a base station control period E1 interface board duplication apparatus and duplication switching method using the same.