KR20020016349A - WTIB in a DECT system and synchronizing method thereof - Google Patents

Abstract

PURPOSE: A WTIB(Wireless Terminal Interface Board) in a DECT(Digital European Cordless Telecommunication) system and a synchronization method therein are provided to stably operate a DECT system by synchronizing the bit/slot/frame, PSCN(Primary Scanning Carrier Number), and multiframe of every base station in the DECT system, in case that many DECT boards are installed in one DECT system. CONSTITUTION: A WTIB(300) in a DECT system is comprised of a voice processing part(310), burst mode controllers(320_1-320_n), Mux/Demuxes(330_1-330_n), line drivers(340_1-340_n), a syncport interface part(350), a triggering signal interface part(360), and a CPU(370). The voice processing part(310) converts transmitted PCM data into an ADPCM(Adaptive Difference PCM) signal in accordance with DECT signal standards. The burst mode controllers(320_1-320_n) receive data from the voice processing part(310) and support a DECT protocol. The Mux/Demuxes(330_1-330_n) multiplex/demultiplex the DECT data of the burst mode controllers(320_1-320_n) and RF module control data respectively. The line drivers(340_1-340_n) respectively exchange data with the Mux/Demuxes(330_1-330_n) and respectively transmit data to base stations(380_1-380_n). The syncport interface part(350) outputs syncports in case that the WTIB(300) is in a master mode, and receives syncports in case that the WTIB(300) is in a slave mode. The triggering signal interface part(360) indicates the initialization time of the PSCN and multiframe of the slave WTIB. The CPU(370) controls each of the components of the WTIB(300).

Description

Wireless support board of DCT system and its synchronization method {WTIB in a DECT system and synchronizing method}

The present invention relates to a Digital European Cordless Telecommunication (DECT) system, and more particularly, to a synchronization method between base stations in a DECT system, in particular, when a plurality of DECT boards are mounted in one DECT system. Stable operation of the DECT system by synchronizing the bits / slots / frames of all base stations in the DECT system with the PSCN (Primary Scanning Carrier Number) and multiframe synchronization The present invention relates to a wireless support board in a DC system and a synchronization method thereof.

1 is a block diagram schematically showing the configuration of a general DECT system. Referring to FIG. 1, a general DECT system includes an external line such as a public switched telephone network (PSTN) 110 and an integrated service digital network (ISDN) 111, and an internal keyset ( keyset) 112 or a DECT private branch exchange (PABX) system 120 that interfaces with the mobile communication terminals 140_1, 140_2, 140_3, 140_4, and the DECT private exchange system 120. Is connected to a wireless terminal interface board (WTIB), transmits the information transmitted from the DECT private exchange system 120 to the RF module (RF module) to transmit radio waves, or conversely receive data received from the RF module And a base station 130_1, 130_2, 130_3 transmitting to the WTIB, and a mobile communication terminal 140_1, 140_2, 140_3, 140_4 transmitting / receiving data with the base stations 130_1, 130_2, 130_3.

In this case, when the first mobile communication terminal 140_1 is handed over from the first base station 130_1 to the second base station 130_2, the time synchronization between the base stations 130_1 and 130_2 should be identical. In addition, the PSCN and the multiframe number should be the same.

Here, PSCN represents the DECT frequency scanned by the base station 130_1, 130_2, 130_3 to scan and handover requests from the mobile terminals 140_1, 140_2, 140_3, 140_4, and this value is 1.88 GHz. The frequency channels # 0 to # 9 in the ~ 1.90 GHz band are sequentially increased and repeated.

That is, one base station 130_1, 130_2, 130_3, 130_4 can receive only one specific frequency within one DECT frame except for the slot in which the call is made. Therefore, the mobile communication terminal 140_1, 140_2, 140_3, 140_4 also needs to make a call request and a handover request using the same frequency as this PSCN in order to send information to the base stations 130_1, 130_2, 130_3.

In the case of encrypting the information, since the multiframe number value serves as a key of the main encryption, all the mobile communication terminals 140_1, 140_2, 140_3, and 140_4 of the system are assigned to the base station 130_1, 130_2, 130_3).

On the other hand, Figure 2 is a block diagram schematically showing the configuration of a wireless support board employed in a conventional DECT system.

Referring to FIG. 2, the wireless support board 200 employed in the conventional DECT system transmits a voice signal to a PCM (Pulse Code Modulation) voice signal in a highway manner. Send and receive voice processing unit 205, Burst Mode Controller (BMC) supporting the DECT protocol (210_1, 210_2, 210_3, ..., 210_n), and the burst mode controller (210_1, 210_2, 210_3) And multiplexing / demultiplexing units 220_1, 220_2, 220_3, ..., 220_n for multiplexing / demultiplexing DECT data of the ..., 210_n) and RF module coordination data, and remote base stations 240_1, 240_2, 240_3 Line drivers 230_1, 230_2, 230_3, ..., 230_n for transmitting data to ..., 240_n), a central processing unit 150 for controlling the DECT service to operate normally, and data of a program. It consists of a ROM 260 for storing and a RAM 270 capable of writing and reading the required data.

Then, the operation of the wireless support board 200 employed in the conventional DECT system having such a configuration will be described. First, in the main unit backplane of the keyphone / private exchange system, the voice signal is transmitted and received as a digital signal through the voice processor 205.

In this case, the voice processing unit 205 converts the transmitted signal into an adaptive differential pulse code modulation (ADPCM) signal of 32 Kbps of G.726, which is a DECT signal standard. The ADPCM data is then transferred to the burst mode regulators 210_1, 210_2, 210_3,..., 210_n.

Meanwhile, the burst mode regulators 210_1, 210_2, 210_3, ..., 210_n multiplex the DECT control signal and the 80-bit 320-bit ADPCM voice signal transmitted for 10 ms every 10 ms according to the DECT protocol. Through the demultiplexer 220_1, 220_2, 220_3, ..., 220_n, the signals are summed into one signal, and the base stations 240_1, 240_2, 240_3 are passed through the line drivers 230_1, 230_2, 230_3, ..., 230_n. , ..., 240_n), modulated into a radio signal and output.

Here, the central processing unit 250 to synchronize the signal processing between the burst mode regulators 210_1, 210_2, 210_3, ..., 210_n and the adjacent burst mode regulators 210_1, 210_2, 210_3, ..., 210_n. ) Sets one burst mode regulator (eg, 210_1) to master mode from among the burst mode regulators 210_1, 210_2, 210_3,..., 210_n, and the remaining burst mode regulators 210_2, 210_3,. 210_n) is set to the slave mode.

In addition, the SYNC port signal SYNCPORT signal, which is a reference synchronization signal, is generated from the burst mode adjuster 210_1 in the master mode, and the burst mode adjusters 210_2, 210_3,..., 210_n in the slave mode supply the sink port signal. Will receive.

By doing so, the DECT bit / slot / frame synchronization of the burst mode adjusters 210_1, 210_2, 210_3, ..., 210_n is matched. The CPU 250 simultaneously sets the same PSCN value and the multiframe number to the burst mode adjusters 210_1, 210_2, 210_3,..., 210_n at a predetermined time. Therefore, all of the base stations 240_1, 240_2, 240_3,..., 240_n scan the same frequency at a certain point in time.

As such, when there are multiple burst mode controllers in one wireless support board, one central processing unit in the wireless support board may set all burst mode controllers to the same PSCN and multiframe number at a predetermined time. .

However, when multiple wireless support boards are installed in the DECT system, since the burst mode controllers in each board are controlled by the central processing unit in each board, the central processing unit in each wireless support board is in burst mode at a predetermined time. It is difficult to set the regulators to the same PSCN and multiframe number.

Accordingly, the main board of the DECT keyphone or the DECT private exchange usually cannot access all the boards at the same time. In addition, when the initialization information is transmitted from the main board to the DECT wireless support board in the form of command delivery, the burst mode controllers are set within the same frame and at the same time by decoding the command transmitted from the DECT wireless support board. There is a limit that cannot be guaranteed.

The present invention was created in view of the above conditions, and when multiple DECT boards are mounted in one DECT system, the DECT is adjusted by synchronizing bit / slot / frame, PSCN, and multi-frame synchronization of all base stations in the DECT system. The purpose of the present invention is to provide a wireless support board and a synchronization method of the DECT system that can operate the system stably.

1 is a block diagram schematically showing the configuration of a general DECT system.

Figure 2 is a block diagram schematically showing the configuration of a wireless support board employed in a conventional DECT system.

Figure 3 is a block diagram showing the configuration of a wireless support board of the DECT system according to the present invention.

Figure 4 is a block diagram conceptually showing a synchronization device of the DECT system employing a wireless support board of the DECT system according to the present invention.

5 is a view showing a synchronization signal of a DECT system employing a wireless support board of the DECT system according to the present invention.

6 is a view showing a synchronization signal of a slave radio support board of the DECT system employing a radio support board of the DECT system according to the present invention.

7 is a diagram illustrating a message transmission process between a master / slave radio support board of a DECT system employing a radio support board of a DECT system according to the present invention.

8 is a flowchart illustrating a BMC initialization process of a wireless support board in a DECT system employing a wireless support board of the DECT system according to the present invention.

9 is a flowchart illustrating a BMC initialization process of a slave wireless support board in a DECT system employing a wireless support board of a DECT system according to the present invention.

10 is a flowchart illustrating a BMC initialization process of the master wireless support board in the DECT system employing the wireless support board of the DECT system according to the present invention.

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

110 ... Public switched telephone network 111 ... Integrated information network

112 ... Keyset 120 ... DECT Private Exchange

130_1, 130_2, 130_3 ... base station

140_1, 140_2, 140_3, 140_4 ... mobile communication terminal

200, 300 ... Wireless support board 205, 310 ... Voice processing unit

210_1, 210_2, 210_3, ..., 210_n ... Burst Mode Regulator

220_1, 220_2, 220_3, ..., 220_n ... Multiplexing / Demultiplexing Unit

230_1, 230_2, 230_3, ..., 230_n ... line drivers

240_1, 240_2, 240_3, ..., 240_n ... base stations

250, 370 ... central processor 260, 390 ... ROM

270, 395 ... RAM

320_1, 320_2, 320_3, ..., 320_n ... Burst Mode Regulator

330_1, 330_2, 330_3, ..., 330_n ... Multiplex / Demultiplexer

340_1, 340_2, 340_3, ..., 340_n ... line drivers

350 ... Sync port interface 360 ... Triggering signal interface

380_1, 380_2, 380_3, ..., 380_n ... base station

410 ... Mainboard

420, 430 ... Slave Mode Wireless Support Board

440 ... Master Mode Wireless Support Board 421, 431, 441 ... Central Processing Unit

422, 432, 442 ... Burst Mode Regulator

Wireless support board of the DECT system according to the present invention to achieve the above object,

A voice processing unit for transmitting and receiving a PCM voice signal to and from the backplane of the main device and converting the transmitted PCM data into an ADPCM signal having a DECT signal standard;

A burst mode adjuster receiving data from the voice processor and supporting a DECT protocol;

A multiplexer / demultiplexer for multiplexing / demultiplexing DECT data of the burst mode regulator and RF module control data;

A line driver for exchanging data with the multiplexer / demultiplexer and transmitting data to a base station at a distance;

According to the mode of the wireless support board, in the case of the wireless support board in the master mode, the sync port is outputted, and in the slave mode, the sync port interface unit receives the sync port in the sync port. Wow;

Triggering signal interface unit for informing the initialization time of the PSCN and multi-frame of the wireless support board of the slave mode in the wireless support board of the master mode; And

It is characterized in that it comprises a central processing unit for controlling the first component.

Here, the sync port signal is connected between the burst mode regulators under the control of the central processing unit, and the trigger signal is characterized in that the connection between the central processing unit of each wireless support board.

In addition, the synchronization method of the DECT system wireless support board according to the present invention to achieve the above object,

(a) determining whether the wireless support board is a wireless support board in a master mode;

(b) if the mode of the wireless support board is a master mode as a result of the determination in step (a), setting the operation mode to the master mode to match basic synchronization; And

(c) It is characterized in that it comprises the step of setting the PSCN (PSCN) and the multi-frame number of the wireless support board.

Here, (i) if the wireless support board mode is a slave mode as a result of the determination in step (a), setting the operation mode to slave mode;

(j) acquiring bit / slot / frame counter synchronization according to the slave mode setting in step (i);

(k) the wireless support board requesting multiframe number information from the wireless support board in a master mode; And

(l) The wireless support board is provided with multiframe number information from the wireless support board in the master mode, and the reference to the provided information comprising the step of setting the PSCN (PSCN) and multiframe number have.

According to the present invention, when multiple DECT boards are mounted in one DECT system, the DECT system can be stably operated by matching the bits / slots / frames, PSCNs, and multi-frame synchronizations of all base stations in the DECT system. There is an advantage.

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

Figure 3 is a block diagram showing the configuration of a wireless support board of the DECT system according to the present invention.

Referring to FIG. 3, the wireless support board 300 of the DECT system according to the present invention exchanges a PCM voice signal with a backplane of a main device, and converts the transmitted PCM data into an ADPCM signal of a DECT signal standard. ), Burst mode regulators 320_1, 320_2, 320_3, ... 320_n receiving data from the voice processor 310 and supporting the DECT protocol, and the burst mode regulators 320_1, 320_2, 320_3, .. 320_n), the multiplexing / demultiplexing unit 330_1, 330_2, 330_3, ... 330_n for multiplexing / demultiplexing DECT data and RF module control data, and the multiplexing / demultiplexing unit 330_1, 330_2, 330_3, ... 330_n), and the line driver (340_1, 340_2, 340_3, ... 340_n) for transmitting data to the base station (380_1, 380_2, 380_3, ... 380_n) in the distance, and wireless support Depending on the board mode, the sync port is output in the case of a master mode wireless support board. In the case of the wireless support board in the slave mode, the sync port interface unit 350 receiving the sync port, and the triggering informing the initialization time of the PSCN and the multiframe of the wireless support board in the slave mode in the wireless support board in the master mode. The signal interface unit 360 and a central processing unit 370 for controlling the components are included.

Here, reference numeral 390 denotes a ROM which stores data of a program, and reference numeral 395 denotes a RAM capable of writing and reading required data.

On the other hand, Figure 4 is a block diagram conceptually showing a synchronization device of the DECT system employing a wireless support board of the DECT system according to the present invention.

Referring to FIG. 4, in order to support a plurality of wireless support boards 420, 430, and 440 in a DECT system employing a wireless support board of the DECT system according to the present invention, a synchro signal for synchronizing is essential and additional. This requires a triggering signal to match the PSCN and multiframe numbers.

Here, the sync port signal is connected between the burst mode regulators 422, 432, and 442 under the control of the CPU 421, 431, and 441, and the trigger signal is centrally processed by the wireless support boards 420, 430, and 440. Connected between devices 421, 431, 441.

The master mode wireless support board 440 generates a synchronization signal, and simultaneously generates a sync port signal and a triggering signal. Accordingly, the slave mode wireless support boards 420 and 430 first synchronize the bit / slot / frame to the sync port signal in advance, and set the PSCN and the multiframe number according to the triggering signal.

Then, the operation of the DECT system employing the wireless support board of the DECT system having such a configuration will be described with reference to FIGS. 5 and 6. 5 is a view showing a synchronization signal of a DECT system employing a wireless support board of the DECT system according to the present invention, Figure 6 is a slave wireless support board of the DECT system employing a wireless support board of the DECT system according to the present invention A diagram illustrating a synchronization signal.

Referring to FIG. 5, frame # 15 has a longer time than other frames, and a simple burst mode adjuster using the same to frame synchronization (see 320_1, 320_2, 320_3, ..., 320_n of FIG. 3) Synchronization can be achieved with the register control of.

In the initial setting of the PSCN value, the burst mode adjusters 320_1, 320_2, 320_3, ..., 320_n each time a register (Set Counter Request command) is initialized at frame # 15 every time the frame is set. In this case, when the register is set, the burst mode adjusters 320_1, 320_2, 320_3,..., 320_n are set to PSCN and multiframe number values as preset values to be changed.

On the other hand, the central processing unit 370 of the wireless support board (see 300 of FIG. 3) from the main control board (see 410 of FIG. 4), the wireless support board 300 operates in any mode, that is, master mode or slave mode. Information about the operation mode can be obtained through receiving information of whether or not or through a hardware switch.

First, hardware setting for the master / slave mode is performed to determine an operation direction of the sync port signal and the triggering signal. That is, it may be set high in the master mode and low in the slave mode.

In addition, in the case of a master mode wireless support board, the burst mode controller 320_1, 320_2, 320_3, ..., 320_n is set to generate a sync port, and the rest receives the sync port signal and synchronizes the slave mode. Set to.

In the slave mode wireless support board, all burst mode controllers 320_1, 320_2, 320_3, ..., 320_n receive the sync port signal and synchronize with each other. In this way, bit / slot / frame synchronization can be achieved by setting registers of the basic burst mode adjusters 320_1, 320_2, 320_3, ..., 320_n.

On the other hand, the process of matching the PSCN and the multi-frame number, referring to Figure 6, when the master mode wireless support board set the PSCN value to 3 (odd) initially in the frame # 0, the time frame 0 is repeated 3 Will take 800ms. This is because PSCN is repeated from 0 to 9, and the frame number is repeated from 0 to 15, so the least common multiple of 10 and 16 is 80, and one frame is 10ms, so it takes 800 msec.

In the embodiment of the present invention, to show that the synchronization is matched to the LED (LED) from the outside, by using a 1.8-second cycle, it was possible to check the synchronization by the LED on / off of all the wireless support boards.

As shown in FIG. 6, the wireless support board of the master mode informs this information that the PSCN of the current frame 0 is 3 to the wireless support board of the slave mode. To show that they matched, we triggered the trigger signal every 1.8ms.

That is, since the PSCN is 3 when the trigger signal is received, as long as the next PSCN is set, frame # 0 after multiframe may be 3 + 16 = 19, that is, the PSCN value of frame 0 in the next multiframe may be set to 9. In addition, the multi-frame number can be set to the received multi-frame number by requesting information from the wireless support board in the slave mode to the wireless support board in the master mode. In the case of the multiframe number, the information is updated at 1.8 second intervals, so the wireless support board in the slave mode is inferred and set to the multiframe number after 1.8 seconds.

Meanwhile, FIG. 7 is a diagram illustrating a message transmission process between a master / slave radio support board of a DECT system employing a radio support board of a DECT system according to the present invention.

Referring to FIG. 7, first, all of the wireless support boards in the master mode are basically initialized and normally operated, and the slave support wireless board first requests current multiframe number information generated at 1.8 second intervals. BM_MFC_INFO_REQ: BMC Multiframe Number Information Request). The wireless support board in the master mode receiving this responds to the wireless support board in the slave mode with the current multiframe number information (BM_MFC_INFO_RES: BMC Multiframe Number Information Response).

After receiving the BM_MFC_INFO_RES in the slave mode, the wireless support board receives the trigger signal transmitted by the wireless support board in the master mode every 1.8 seconds, and receives and processes the BM_SYNC_REQ for setting the PSCN. After receiving the BM_SYNC_REQ, you can set the PSCN and multiframe numbers, and set other DECT functions to register settings.

Flow charts thereof are shown in FIGS. 8, 9 and 10. 8 is a flowchart illustrating a BMC initialization process of the wireless support board in the DECT system employing the wireless support board of the DECT system according to the present invention, Figure 9 is a DECT system employing the wireless support board of the DECT system according to the present invention 10 is a flowchart illustrating a BMC initialization process of a slave wireless support board, and FIG. 10 is a flowchart illustrating a BMC initialization process of a master wireless support board in a DECT system employing a wireless support board of a DECT system according to the present invention.

Referring to FIG. 8, first, the wireless support board will be described for performing hardware control according to a master / slave mode.

First, the wireless support board determines whether the wireless support board is a wireless support board of the master mode (step 801). If the wireless support board is the master mode, as a result of the determination in step 801, the basic synchronization is immediately set to the basic master mode setting, and the PSCN, the multiframe number, and other DECT parameters are immediately set (steps 802 to 805). ).

As a result of the determination in step 801, if the wireless support board is in slave mode, the slave mode is set to first, and bit / slot / frame counter synchronization is performed first (steps 806 to 807). Then, the multi-frame number information is requested from the wireless support board in the master mode (step 808). When the multiframe information is received, the Sync Ready Flag is set to respond to triggering (step 809).

As shown in FIG. 9, when a triggering signal is generated in the wireless support board in the master mode, an interrupt signal is generated in the wireless support board in the slave mode (step 901). Accordingly, it is determined whether the Sync Ready Flag is set (step 902).

As a result of the determination in step 902, when the Sync Ready Flag is set, a BM_SYNC_REQ Event is generated (step 903). The PSCN of the slave mode wireless support board is set to 9, and the multiframe number is set to the inferred burst mode regulators. Done. When the frame reaches 15, the BMCs of all the DECT systems are synchronized with the set value (steps 904 to 905).

As a result of the determination in step 902, if the Sync Ready Flag is not set, the process ends.

On the other hand, the BMC Interrupt Service Routine of the burst mode controller for generating the triggering signal in the master mode radio support board and controlling the LED signal showing that the radio support board in the DECT system is in sync is Same as FIG. 10.

That is, in the DECT Multiframe Interrupt Service Routine occurring every 160ms, it is determined whether the frame # 0 is the PSCN of 3 (step 1001). As a result of the determination in step 1001, when the PSCN is 3, it is determined whether or not it is in the master mode (step 1002).

At this time, as a result of the determination in step 1002, in the case of the wireless support board in the master mode, the LED is changed, in the case of the wireless support board in the master mode, it generates a triggering signal every 1.8 seconds. That is, the wireless support boards of all DECT systems are synchronized every 800ms, so that the LEDs change in the same time (steps 1003 to 1006).

On the other hand, if the PSCN is not 3 as a result of the determination in step 1001, the DECT interrupt service is performed (step 1006). In addition, as a result of the determination in step 1002, if the wireless support board is not the master mode, the process after step 1005 is performed.

As described above, according to the wireless support board of the DECT system and the synchronization method thereof according to the present invention, when a plurality of DECT boards are mounted in one DECT system, bits / slots / frames and PSCNs of all base stations in the DECT system, By matching multi-frame synchronization, the DECT system can be operated stably.

Claims (5)

A voice processing unit for transmitting and receiving a PCM voice signal to and from a back plane of the main device and converting the transmitted PCM data into an ADPCM signal of a DECT signal standard; A burst mode controller (BMC) receiving data from the voice processor and supporting a DECT protocol; A multiplexer / demultiplexer for multiplexing / demultiplexing DECT data of the burst mode regulator and RF module control data; A line driver for exchanging data with the multiplexer / demultiplexer and transmitting data to a base station at a distance; According to the mode of the wireless support board, in the case of a wireless support board of the master mode outputs a sync port (syncport), in the case of a wireless mode support board of the slave mode, the sink port interface unit for receiving the sink port; Triggering signal interface unit for informing the initialization time of the PS CN and multi-frame of the wireless support board of the slave mode in the wireless support board of the master mode; And Wireless support board of the DECT system comprising a central processing unit for controlling the first component. The method of claim 1, The sync port signal is connected to the burst mode regulators under the control of the central processing unit wireless support board, characterized in that. The method of claim 1, The trigger signal is a wireless support board of the DECT system, characterized in that connected between the central processing unit of each wireless support board. (a) determining whether the wireless support board is a wireless support board in a master mode; (b) if the mode of the wireless support board is a master mode as a result of the determination in step (a), setting the operation mode to the master mode to match basic synchronization; And (c) a method of synchronizing the DECT system wireless support board, comprising setting a PSCN and a multiframe number of the wireless support board. The method of claim 1, (i) if the wireless support board is in slave mode as a result of the determination in step (a), setting the operation mode to slave mode; (j) in accordance with the slave mode setting in step (i), the wireless support board adjusting bit / slot / frame counter synchronization; (k) the wireless support board requesting multiframe number information from the wireless support board in a master mode; And (l) The wireless support board is provided with multiframe number information from the wireless support board in the master mode, and the reference information includes the step of setting the PSCN (PSCN) and multiframe number comprising the step of DECT How to synchronize system wireless support board.