KR100439233B1 - Apparatus and method for transmission of monitoring message in a wireless local loop terminal - Google Patents

Abstract

The present invention provides an apparatus and method for transmitting a monitoring message of a wireless subscriber network terminal which enables the indoor unit to transmit a monitoring console message of the outdoor unit through an E1 link connecting the indoor unit and the outdoor unit in the W-CDMA WLL outdoor terminal. The present invention provides link means for forming a data transmission path between the outdoor unit and an indoor period according to a set interface; An outdoor unit for converting and transmitting monitoring data suitable for an interface of the link means, and converting data received through the link means to the reverse of the conversion process and restoring data of a form equivalent to the monitoring data; Receives data transmitted from the outdoor unit and performs inverse transformation corresponding to the conversion process of the outdoor unit to form monitoring data, and receives monitoring data to be transmitted to the outdoor unit from the monitoring console to convert the data to correspond to the conversion process of the outdoor unit. It includes an indoor unit for transmitting through the link means, it is possible to monitor or control the status of the outdoor unit indoors by transmitting a monitoring console message of the outdoor unit separated from each other in the W-CDMA WLL and connected only to the E1 link to the indoor unit. The microprocessor can be monitored in a location that is not directly accessible.

Description

Apparatus and method for transmission of monitoring message in a wireless local loop terminal}

The present invention relates to transmission of a monitoring message of a wireless local loop (WLL) terminal, and more particularly, to an indoor unit of an outdoor unit through an E1 link connecting an indoor unit and an outdoor unit in a W-CDMA WLL outdoor terminal. The present invention relates to an apparatus and method for transmitting a monitoring message of a wireless subscriber network terminal for transmitting a monitoring console message.

In general, a device operating under the control of a microprocessor uses a monitoring console to monitor or control the state. The RS-232 serial interface is mainly used for monitoring consoles. This signal can be connected to a personal computer or terminal providing an RS-232 serial interface and used as a message output device.

1 is a block diagram of a general monitoring console block.

As shown in FIG. 1, a virtual processor 110 for controlling a device exists in a virtual device 110 such as a communication equipment unit or a communication terminal device operating under the control of a microprocessor. In embedded processors, a universal asynchronous receiver and transmitter (UART) is often embedded in the microprocessor. For monitoring and controlling the state of the microprocessor 111, the RS-232 serial interface 130 is used as an input / output device of the monitoring console 120. For this purpose, there is a UART 112 that provides an asynchronous serial interface. .

Since the signal input and output to the UART 112 is a Complementary Metal Oxide Semiconductor (CMOS) level signal, the RS-232 transceiver 113 is used to convert the signal into an RS-232 signal level of -15V to -5V and + 5V to + 15V. ) Exists.

When the state of the device is inputted and outputted through the UART 112, the signal is converted to the RS-232 serial interface standard by performing level conversion using the RS-232 transceiver 113, and then the RS-232 serial interface is provided. The communication with the personal computer or terminal 120 is performed.

On the other hand, by using the W-CDMA method can perform wireless communication between the terminal and the base station of the wireless subscriber network. The terminal device applied to the W-CDMA WLL includes an outdoor unit and an indoor unit.

2 is a block diagram of a W-CDMA WLL terminal apparatus according to an example of the prior art.

As shown in FIG. 2, the WLL terminal includes an outdoor unit 210 that manages the entire operation and serves as a master, and an indoor unit 220 that performs various interface related functions under the control of the outdoor unit 210. Is done. An E1 interface is used between the outdoor unit 210 and the indoor unit 220.

The processor unit 211, the UART 212, and the RS-232 transceiver 213 of the outdoor unit 210 are used to interface with the monitoring console, and the outdoor unit 210 is connected to the monitoring console through the RS-232 transceiver 213. Exchange console monitoring signals. The E1 link units 214 and 221 for the E1 interface between the outdoor unit 210 and the indoor unit 220 include a framer, a CEPT transceiver, a transformer, and the like. As is known.

As such, the monitoring console is connected to the outdoor unit 210 and monitors the monitoring console in the outdoor unit 210 located outdoors.

However, if the indoor console wants to monitor the monitoring console, since the monitoring console cannot be monitored outdoors, it is necessary to transmit the monitoring console message using the E1 interface between the indoor and outdoor periods. In order to transmit the monitoring console message using the E1 interface, the following terminal structure is required.

3 is a block diagram of a W-CDMA WLL terminal apparatus according to another example of the prior art.

As shown in FIG. 3, in order to monitor the monitoring console of the outdoor unit 310 in the indoor unit 320, the W-CDMA terminal includes the outdoor unit 310, the indoor unit 320, and an E1 interface connecting the outdoor unit 310. Here, timeslot assignment units 312 and 322 are provided for allocating the messages to appropriate time slots so that the monitoring console messages can be transmitted to each other via the E1 interface. The timeslot assignment unit 312 and 322 allocates a time slot using a component or logic such as a high-level Data Link Controller (HDLC).

In addition, in the indoor unit 320, in order to control the timeslot allocation unit 312 and 322, a processor unit 323 implemented by a microprocessor or the like is added, and the UART 324 and the RS-232 transceiver 325 are connected. The outdoor unit 310 is moved from the outdoor unit 310 to the indoor unit 320.

In this configuration, the processor unit 311 of the outdoor unit 310 outputs a monitoring console message to the timeslot allocator 312 connected thereto so that the transmission register value is recorded, and this monitoring console message is recorded in a specific timeslot. Is assigned to. The message allocated to the timeslot is transmitted to the indoor unit 320 through the E1 interface via the framer of the E1 link unit 313.

The indoor unit 320 detects the timeslot of the monitoring console message from the timeslot assignment unit 322 via the E1 link unit 321. When the time slot of the monitoring console message is detected, the processor unit 323 of the indoor unit 320 extracts the corresponding data, reads the reception register value, and outputs the data to the UART 324 to write the transmission register value. The message recorded in the transmit register of the UART 324 is transmitted to the monitoring console as a console monitoring signal through the RS-232 transceiver 325. The reverse is also done in the same system.

As described above, the conventional W-CDMA WLL outdoor terminal has a difficulty in operating the device because a monitoring console for monitoring or controlling the device status is located in the outdoor unit.

Therefore, there is a need for a method for console monitoring indoors. In the related art, since a time slot allocation element that operates equivalent to an HDLC controller is added, a microprocessor for controlling the same has to be added to the indoor unit.

In addition, to date, most embedded processors have a built-in UART in the microprocessor. In this case, the UART of the outdoor unit is not utilized, which causes a complicated peripheral circuit.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to transmit a monitoring console message of an outdoor unit by an indoor unit through an E1 link connecting an indoor unit and an outdoor unit in a W-CDMA WLL outdoor terminal. It is to provide a monitoring message transmission device of a wireless subscriber network terminal.

Another object of the present invention is to provide a message transmission method of a wireless subscriber network terminal which can transmit and receive over an E1 link by performing oversampling and rate conversion of a monitoring message in an indoor period and an outdoor period in a W-CDMA WLL outdoor terminal. will be.

1 is a block diagram of a general monitoring console block.

2 is a block diagram of a W-CDMA WLL terminal apparatus according to an example of the prior art.

3 is a block diagram of a W-CDMA WLL terminal apparatus according to another example of the prior art.

Figure 4 is a block diagram of a wireless subscriber network terminal according to an embodiment of the present invention.

5 is a block diagram of an apparatus for transmitting a monitoring message of a wireless subscriber network terminal according to an embodiment of the present invention.

6 is a signal timing diagram of the message transmission device of FIG. 5;

7 is a flow chart of a monitoring message transmission method of a wireless subscriber network terminal according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

510: outdoor unit 520: indoor unit

511, 521: oversampling section 512, 522: rate converting section

513, 523: E1 link portion 524: RS-232 transceiver

An apparatus for transmitting a monitoring message of a wireless subscriber network terminal of the present invention for achieving the above object comprises: link means for forming a data transmission path between the outdoor unit and an indoor period according to a set interface; An outdoor unit for converting and transmitting monitoring data suitable for an interface of the link means, and converting data received through the link means to the reverse of the conversion process and restoring data of a form equivalent to the monitoring data; Receives data transmitted from the outdoor unit and performs inverse transformation corresponding to the conversion process of the outdoor unit to form monitoring data, and receives monitoring data to be transmitted to the outdoor unit from the monitoring console to convert the data to correspond to the conversion process of the outdoor unit. It characterized in that it comprises an indoor unit for transmitting through the link means.

In the monitoring message transmission method of the wireless subscriber network terminal of the present invention for achieving the above object, in the case of transmitting the monitoring data from the outdoor unit, the link means by oversampling to the set oversampling frequency and the rate conversion according to the transmission speed of the link means When the indoor unit receives the monitoring data, the data received by the link means is subjected to the inverse conversion of the rate conversion applied when the outdoor unit is transmitted, and then outputs according to the same frequency as the oversampling frequency applied when the outdoor unit is transmitted. It is characterized by restoring the monitoring data.

In the case where the indoor unit transmits the monitoring data, the monitoring data input from the monitoring console is oversampled to the set oversampling frequency, the rate is converted according to the transmission speed of the link means, and transmitted through the link means. In the case of receiving, the monitoring data is restored by performing inverse transformation of rate conversion applied at the time of transmission of the indoor unit and outputting the data received at the same frequency as the oversampling frequency applied at the transmission of the outdoor unit. .

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 4 is a block diagram of a wireless subscriber network terminal according to an embodiment of the present invention, Figure 5 is a block diagram of a monitoring message transmission apparatus of a wireless subscriber network terminal according to an embodiment of the present invention, Figure 6 is according to FIG. 7 is a signal timing diagram of a message transmission apparatus, and FIG. 7 is a flowchart illustrating a monitoring message transmission method of a wireless subscriber station terminal according to an embodiment of the present invention.

According to FIG. 4, the present embodiment is applied to a W-CDMA WLL outdoor terminal, an outdoor unit 410 corresponding to a master of a terminal device, and an indoor unit 420 that provides various subscriber interfaces by controlling the outdoor unit 410. ), E1 link which is a link means for connecting the outdoor unit 410 and the indoor unit 420. In order to configure an E1 link connecting the outdoor unit 410 and the indoor unit 420, the outdoor unit 410 and the indoor unit 420 each include E1 link units 414 and 421 having logic for providing an E1 interface. have.

In order to enable monitoring of the monitoring console in the indoor unit 420, the outdoor unit 410 includes a processor unit 411, a UART 412, an oversampling / rate conversion stage 413, and an E1 link unit 414. Is done. The indoor unit 420 corresponding to the outdoor unit 410 includes an E1 link unit 421, an oversampling / rate conversion stage 422, and an RS-232 transceiver 423. The functions of the processor unit 411, the UART 412, the E1 link units 414 and 422, and the RS-232 transceiver 423 are the same as described above.

In the outdoor unit 410, the oversampling / rate conversion stage 413 is responsible for oversampling and rate conversion of the serial interface signal output of the UART 412. In the case of the indoor unit 420, the oversampling / rate conversion stage 422 corresponds to the oversampling / rate conversion stage 413 of the outdoor unit 410, and the RS-232 transceiver 423 transmits a CMOS level signal to the RS-. Convert to a 232 level signal. The oversampling / rate converting stages 413 and 422 are functionally separated oversampling and rate converting units. The oversampling / rate converting stages 413 and 422 may be integrated into the E1 link units 414 and 421 according to the device implementation. .

According to FIG. 5, the console message output from the processor unit 411 of the outdoor unit 510 is converted into a serial signal of RS-232 level by the UART 412. The RS-232 level monitoring console message is applied to the oversampling / rate converting stage 413, and is oversampled by the oversampling unit 511 and then rate converted by the rate converting unit 512. The rate converter 512 converts the samples formed by oversampling using logic having a dual-port RAM (DPRAM) structure into an E1 clock (2.048 MHz).

Data generated by oversampling and rate conversion in the outdoor unit 510 is transferred to the indoor unit 520 through the E1 link unit 513.

The data transmitted to the indoor unit 520 via the E1 link is interfaced by the E1 link unit 421, and then a reverse conversion process of rate conversion and oversampling is performed to form a signal similar to the serial signal of the RS-232 level. This output waveform is applied to an RS-232 transceiver 524, converted to an RS-232 level signal, and transmitted to a console terminal for console monitoring.

On the contrary, the RS-232 serial signal of the console terminal is converted into a CMOS level signal through the RS-232 transceiver 524 of the indoor unit 520, and then oversampled and converted by the E1 link unit 523. .

Then, the data input to the E1 link unit 513 of the outdoor unit 510 is converted into an RS-232 serial signal through a rate conversion and an inverse conversion process of oversampling, and then transferred to the UART 412 to be applied to the processor unit 411. Can be done.

Oversampling refers to sending a sideband component other than the baseband caused by sampling to a high frequency region far from the baseband by making the sampling frequency higher than necessary. Since the sharp cutoff characteristic is required for the low pass filter used to extract only the baseband signal when the sampled signal is reproduced, the distortion of the signal caused by the use of such a filter becomes a problem.

Subsequently, with reference to an embodiment of the message transmission method according to the present invention, the waveform change caused by performing oversampling and rate conversion of a message input from the UART 412 and performing inverse conversion again will be described. FIG. 6 shows a waveform diagram when the RS-232 signal is an 8-bit data bit, no parity bit, and one stop bit.

6 and 7, when the transmission rate of the RS-232 signal is 9600bps, the width of one bit becomes about 104us. A clock faster than this bit rate is oversampled using the oversampling clock (S710).

Here, the oversampling clock uses a clock that is fast enough that the jitter of the sampled and reconstructed signal does not affect the RS-232 signal, and is oversampled on the positive edge of the clock.

In general, sampling is performed at twice or four times as fast, but since serial data output from the UART 412 and input to the oversampling unit 511 is asynchronous, samples are sampled at twice or four times as fast. Taken together, jitter can occur when restoring the data. So this embodiment uses 1.024 MHz, which is a sufficiently fast clock, and takes samples on the positive edge of this clock. Therefore, the acquired samples (Oversampled Samples) are present one by one period of the over sampling clock.

In order to transmit the oversampled samples through the E1 interface, the rate converter 512 rate-converts samples taken at 1.024 MHz to an E1 clock (2.048 MHz) (S720).

The rate-converted samples are rearranged in an assigned time-slot allocated by an E1 clock so that the E1 link unit 513 can be transmitted to a predetermined timeslot of E1. The rate converted signal is transmitted to the indoor unit 520 through the E1 link (S730 to S740).

This allows the transmission process to transmit RS-232 serial signals.

The reception process of restoring the signal received by the indoor unit 520 proceeds to the reverse of the previously described transmission process.

That is, the rate-converted signal is extracted from the timeslot determined by the E1 link unit 523 of the indoor unit 520, and the extracted E1 rate signals are rate-converted by the rate converter 522 to be originally sampled. The restored signal is output by the oversampling unit 521 according to a clock having the same speed as that used during sampling of the oversampling unit 521 of the outdoor unit 510. The output of the oversampling unit 521 is restored to the original RS-232 output signal by the RS-232 transceiver 524 (S750 to S780).

And the RS-232 signal transmitted from the monitoring console terminal to the processor unit 411 of the outdoor unit 410 proceeds in the reverse of the above-described process, but the scheme is the same.

As described above, the present embodiment enables monitoring console data to be mutually transmitted from the W-CDMA WLL outdoor terminal connected to the outdoor unit and the indoor period through the E1 link. By monitoring the outdoor unit and indoor period monitoring console data, it is possible to efficiently monitor the indoor unit and the indoor unit while monitoring the indoor unit.

Therefore, W-CDMA WLL basic terminal is related to message transmission of monitoring console caused by separate operation of microprocessor, outdoor unit including modem and RF module, and indoor unit including subscriber interface in order to adapt to poor radio wave environment such as underground. The problem can be solved.

The embodiments described above are within the scope of various changes, modifications, and equivalents of the present invention. Therefore, the present invention is not limited to the description of the examples.

According to the method of transmitting a monitoring message of a wireless subscriber network terminal of the present invention, the status of the outdoor unit indoors is transmitted by transmitting a monitoring console message of an outdoor unit which is separated by several tens to several hundred meters from the W-CDMA WLL and connected only to the E1 link to the indoor unit. There is an effect that can be monitored or controlled.

In addition, as shown in the relationship between the indoor unit and the outdoor period, there is an advantage that it is possible to monitor the microprocessor in a location which is not directly accessible using a simple method.

Claims (7)

In the wireless subscriber network device having an outdoor unit and an indoor unit, and link means for forming a data transmission path therebetween, In the indoor unit, outdoor unit, An oversampling unit for oversampling data output from the UART built in the outdoor unit according to a set clock and outputting the data according to a used clock when transmitting and receiving monitoring data; And a rate converter for assigning the oversampled data to each time slot of the link means to perform rate conversion and output the same. The method of claim 1, The transmission speed of the link means is a monitoring message transmission apparatus of a wireless subscriber network terminal, characterized in that determined by E1 clock. The method of claim 1, And a sampling frequency in the oversampling unit is set higher than a transmission rate of serial monitoring data. delete Oversampling the monitoring data output from the outdoor unit's UART to a set oversampling frequency; Rate converting the oversampled signal according to a transmission speed of link means; Rearranging the rate converted samples into timeslots so that they can be transmitted in predetermined timeslots of link means; And transmitting the rate converted signals to an indoor unit through a link unit. The method of claim 5, And the monitoring data received from the outdoor unit is restored to the monitoring data at the time of transmission through the reverse process at the time of the transmission. The method of claim 5, And transmitting the data output from the console of the indoor unit to the processor unit of the outdoor unit is performed in the reverse of the signal receiving process.