KR20000041907A - Wireless local loop multi-line module - Google Patents

Abstract

PURPOSE: A wireless local loop(WLL) multi-line module is provided to supply the sufficient number of lines with a low cost by extending the number of base stations per a cell using a radio frequency module. CONSTITUTION: A wireless local loop(WLL) multi-line module comprises a first to fourth radio frequency modules(21-24), a private branch exchange(30) for matching 32 subscriber lines, and a radio port interface module(40) for interfacing a corresponding radio frequency module and the private branch exchange. The radio port interface module(40) exchanges signaling information with each radio frequency module through a serial input output(SIO), and realizes corresponding voice information in an asynchronous way by use of two combos.

Description

Dbliel multi line module

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a WLL multi-line module, and more particularly, to a WLL multi-line module for reducing the cost per line and ensuring a sufficient number of lines using a small capacity exchanger.

Single Line WLL terminal is a general WLL terminal that can be used by only one subscriber per RF module. It is composed of antenna, RF module, and telephone in the form of wireless telephone in home. do.

It has a single RF module and is directly connected to a WLL exchange to provide a service.

Then, the configuration of the corresponding WLL exchange, as shown in Figure 1, RIU (Radio Interface Unit 11) to match the subscriber (Fax), Voice (Voice), Data (Data) and Modem (Modem) And a plurality of RPs (Radio Ports 12-1 to 12-N) for interfacing the corresponding RIUs 11 through the RF module, and RPCs for controlling switching operations of the corresponding RPs 12-1 to 12-N. Radio Port Control (13), a Remote Port Operation & Maintenance Center (RPOM) 14 for processing data with a remote control device under control of the corresponding RPC 13, and a PSPDN (Packet) under control of the corresponding RPC 13; It includes an IWF (Inter Working Function) 15 that matches the Switched Public Data Network.

In the switch system having the above-described configuration using a conventional single line WLL terminal, telephone, fax, and data service can be simply received through one RF module and the corresponding RF module in each home.

As such, in the related art, there is a disadvantage in that a subscriber must bear a lot of costs because an RF module must be included in each home.

In order to solve the above problems, the present invention relates to a WLL multi-line module using a small-capacity exchanger, and in particular, to expand the number of base stations per cell by using an RF module using CDMA (Code Division Multiple Access) The aim is to provide adequate low-cost telephone lines for countries such as developing countries.

1 is a block diagram showing a typical WLL exchange.

2 is a block diagram illustrating a WLL multi-line module according to an embodiment of the present invention.

3 is a block diagram illustrating a RPIC in FIG. 2;

4 is a view for explaining the flow of signals in FIG.

Explanation of symbols on the main parts of the drawings

21 ~ 24: RF Module

30: Private Branch Exchange System (PBX)

40: RPIC (Radio Port Interface Circuit)

41-1 ~ 41-4: RP (Radio Port) 42, 44: Codec

43: Transformer 45: Modem Card

421: PLL (Phased Locked Loop)

51: Universal Asynchronous Receiver Transmitter (UART)

52: Vocoder

The present invention for achieving the object as described above comprises a RPIC exchange the signaling information with a plurality of RF modules through the SIO, and exchanges the voice information between the respective RF module and the PBX using a combo in an asynchronous manner It is characterized by. In this case, the RPIC is characterized in that four subscribers can simultaneously talk in an 8: 1 aggregation manner that accommodates 32 subscribers using four RF modules.

The present invention is to make a low-cost WLL terminal using a conventional small-capacity exchanger (for example, 48 lines of PBX (Private Branch Exchange)). That is, while a conventional WLL terminal with a large number of single lines is used with one RF module per subscriber, the present invention can accommodate 32 subscribers using four RF modules. Each RF module receives a signal and connects the received wireless signal with 32 subscribers. For example, the exchange performs an operation similar to the 8: 1 aggregation, and the 32 subscribers can alternately call 4 people at the same time. Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a block diagram illustrating a WLL multi-line module according to an exemplary embodiment of the present invention, FIG. 3 is a block diagram illustrating an RPIC in FIG. 2, and FIG. 4 is a diagram for explaining signal flow in FIG. 3. Drawing.

As shown in FIG. 2, the WLL multi-line module according to an embodiment of the present invention includes four RF modules 21 to 24, a PBX 30 matching 32 subscriber lines, and corresponding RF modules 21 to. 24) and an RPIC (Radio Port Interface Circuit) 40, which is an interface module that interfaces between the PBX 30. Here, the PBX 30 uses the conventional telephone connection unit, the switching unit, and the control unit in the existing PBX as it is.

The RPIC 40 exchanges signaling information with each RF module 21 through 24 through SIO (Serial Input Output), and implements the corresponding voice information using two combos in an asynchronous manner. Thus, even if the synchronization between the RF modules 21 to 24 and the PBX 30 is not disrupted, there is no problem in communication, and the distance between the RF modules 21 to 24 and the PBX 30 is to some extent (for example, 1 (Km). It does not matter even if it is dropped to). In addition, it is possible to replace the existing CDMA terminal (not shown in the drawings, for convenience of description) by the RF module (21 to 24) can be applied in various ways as well as replacement of the RF module (21 to 24). Implement so that

On the other hand, as shown in Figure 3, the RPIC 40 is a four-module RP (Radio Port; 41-1 ~ 41-4), four channels of the first codec 42, and a transformer (Transformer) 43), a second codec 44 of four channels, and a modem card 45.

Each of the RPs 41-1 to 41-4 includes an RF module, an interface module, and a baseband module. The baseband module includes an ABC chip and a modem chip (called a Qualcomm chip in CDMA). Is done. Here, the corresponding ABC chip controls between the corresponding modem chip and the corresponding interface module. The corresponding modem chip forms the basis of the baseband module, and almost all of the CDMA basic technologies are integrated and have various functions. Universal Asynchronous Receiver Transmitter (51) and Vocoder (52). In addition, the UART 51 processes signaling, which is a data signal necessary to connect a call such as number information, using the RS-232 protocol, and the vocoder 52 outputs the PCM (output from the first codec 42). Pulse Code Modulation) processes the voice part with data.

Each of the RPs 41-1 to 41-4 outputs two clocks to the first codec 42, one of which is a synchronous clock Cntclr and the other of which is a reference clock CK2M. Synchronize the audio signal with the clock.

The first codec 42 is a chip for converting the digital PCM applied from the RPs 41-1 to 41-4 into an analog voice signal, and the synchronization received from the RPs 41-1 to 41-4. With the clock generated by applying the clock Cntclr and the reference clock CK2M to the PLL 421, the frame synchronizing signal and the clock are regenerated and used as the synchronizing clock.

The transformer 43 applies an analog audio signal output through the first codec 42 to the second codec 44.

The second codec 44 converts an analog voice signal applied through the transporter 43 into a digital PCM, and keeps the synchronization clock Cntclr and the reference clock CK2M output from the PBX 30 as they are. It is used as a synchronization signal and a clock to synchronize with the PBX 30.

Referring to the operation of the WLL multi-line module according to an embodiment of the present invention configured as described above are as follows.

Receive the signaling data connected to each RF module 21 ~ 24 through the SIO (Serial Input Output) in the RPIC (40) and deliver the received signaling data to the system through the common memory (Common Memory) .

Also, in order to completely separate a clock from the RF modules 21 to 24, the voice information is received by the RPIC 40 using a combo, converts PCM data into an analog signal, and converts the converted signal again. After changing to PCM data, the PCM data is transferred to the system and switched. Then, the modem card 45 is connected for the fax service.

In other words, the four modules of the RP (41-1 ~ 41-4) has an RF module, an interface module and a baseband module, respectively, in particular the baseband module is composed of an ABC chip and a modem chip.

Here, the ABC chip controls between the modem chip and the interface module, and the modem chip forms the basis of the baseband module and has various functions, among which the functions of the UART 51 and the vocoder 52 are included. Do this.

That is, the UART 51 processes signaling, which is a data signal necessary for connecting a call such as number information, using an RS-232 protocol, and a voice part is processed with PCM data output through the vocoder 52. Lose.

In addition, the RPs 41-1 to 41-4 generate two clocks, a synchronization clock Cntclr and a reference clock CK2M, to synchronize the PCM data output to the first codec 42.

Accordingly, the first codec 42 converts the digital PCM applied from the RPs 41-1 to 41-4 into an analog voice signal, and the synchronization applied from the RPs 41-1 to 41-4. The clock Cntclr and the reference clock CK2M are used to generate a frame synchronizing signal and a clock using a clock generated through a PLL provided therein.

In addition, the analog audio signal output through the first codec 42 is applied to the second codec 44 through the transformer 43 and converted into a digital PCM.

At this time, the second codec 44 synchronizes with the corresponding PBX 30 by using the synchronization clock Cntclr and the reference clock CK2M output from the PBX 30 as they are.

By performing the operation as described above, the RPs 41-1 to 41-4 and the PBX 30 are completely separated in clock synchronization to perform the operation.

On the contrary, the voice signal received through the second codec 44 is processed by performing the same operation as described above.

On the other hand, the signals of the UART 51 in the RP (41-1 ~ 41-4) is composed of all five signals are applied to the PBX (30) side, received data (RXD), transmission data (TXD), DCD The signaling information is exchanged with the RPs 41-1 to 41-4 through five modem signals including DTR and GND.

In addition, the RF modules 21 to 24 may be implemented using N-CDMA, and the corresponding RF modules 21 to 24 may be implemented using current wireless terminals (for example, PCS and DCN). Tube, maintenance, and number information allows wireless access and only a tone source is generated in the PBX 30.

4 illustrates the flow of signals between an interface module and an RF module, using the current wireless terminal (eg, PCS, DCN, etc.) to convert the RF modules 21 to 24 into the RPIC 40. When connected to the PBX (30) can be used to connect. That is, when the WLL multi-line module of the present invention as described above is connected to the PBX 30 and used, the user who uses the PBX 30 may eventually reduce the fee.

Currently, mobile operators offer discounts on mobile phone rates between carriers, which can be used by both mobile phones and mobile phones to make calls to mobile users. To help.

That is, when the current wireless terminal (for example, PCS, DCN, etc.) is adopted as an RF module, the subscriber of the PBX can directly call the wireless terminal without passing through the PSTN when making a call to the wireless terminal. You will receive a discount.

If the RF module of the present invention is replaced with four different wireless terminals (for example, 011, 016, 017, and 019), most mobile phones can be discounted.

The wireless terminal may be mounted simply by connecting a hand free connector of the wireless terminal to the RPIC 40.

As described above, the present invention can reduce the price per line as compared to a single line WLL terminal, and by adopting an RF module using CDMA, the number of base stations per cell can be extended so that the number of lines sufficient for use in a place where a telephone line is insufficient. Can be provided.

Claims (3)

The DBLEL multi-line module, comprising: an RPIC for exchanging signaling information with a plurality of RF modules through an SIO and exchanging voice information between respective RF modules and the PBX using a combo in an asynchronous manner. The method of claim 1, The RPIC comprises a plurality of RP consisting of an RF module, an interface module and a baseband module to perform the functions of UART and vocoder; A first codec for converting the digital PCM from the RP into an analog voice signal; A second codec for converting the analog voice signal of the first codec into a digital PCM; A transformer for transmitting a signal between the first codec and the second codec; DBLUE multi-line module comprising a modem card to provide a modem service. The method of claim 1, The RPIC is a DBLEL multi-line module, characterized in that by using the four RF modules 4 subscribers can call at the same time in an 8: 1 aggregation manner that accommodates 32 subscribers.