KR20050046345A - A method for transmitting sms message using dect in keyphone system - Google Patents

Abstract

The present invention relates to an SMS message transmission method capable of sending and receiving an SMS message through a DECT handset registered as an extension in a key phone system, wherein the key phone system receives a DTMF tone frequency informing transmission of an SMS message from an external trunk line. ; Recognizing receipt of an SMS and receiving an SMS message from an external trunk line; Generating SMS message data including a DECT handset extension number to receive the SMS message and transmitting it to the DECT interface board; Receiving, by the DECT interface board, the SMS message data, processing the SMS message according to the CLMS message specification and transmitting the SMS message to the DECT base station; Broadcasting, by the DECT base station, a CLMS message containing an SMS message through a broadcast channel; And extracting an SMS message from the signal broadcast through the broadcast channel and displaying the same on the LCD screen by the corresponding DECT handset.

Description

A method for transmitting SMS message using DECT in keyphone system}

The present invention relates to an SMS message transmission method using a European digital cordless telephone (DECT) in a key phone system, and more particularly, an SMS message that can send and receive SMS messages through a DECT handset registered as an extension in the key phone system. It relates to a transmission method.

DECT (Digital European Cordless Telecommunication) refers to a European digital cordless telephone using a frequency band with excellent transmission performance of 1.88 GHz to 1.90 GHz. The existing home wireless telephone (CT-1) and outgoing mobile telephone (CT-2) This is a third generation cordless phone. DECT provides a flexible digital method that is emerging as a standard for building codeless networks in homes, corporations, and public institutions.European digital cordless telephone products are currently commercialized. 2 types of home systems, which can be used in homes and offices, and key systems that connect two telephone lines to the main body, and are highly likely to be developed into public mobile communication networks such as mobile phones. to be. Looking at the characteristics of these DECT, using the 1880MHz ~ 1900MHz band, excellent transmission performance, 250mW output can be more than 1 Km in open area, and because the call is not intercepted, security is superior to general wireless telephones. In addition, the standards are adopted by 110 countries, so they can be used with other companies' products. For example, it is possible for the main body to use the product of Company A and the handset to use the product of Company B. Furthermore, the RF home network is easy to configure because it is easy to replace with Bluetooth, and the voice intelligibility is also excellent because of the digital method.

On the other hand, since DECT is a digital telephone such as a cellular / CDMA mobile terminal, it is possible to additionally provide various additional functions such as caller identification service in addition to a voice call function, unlike a conventional analog wireless telephone. At present, SMS service is the most widely used CDMA mobile communication system in Korea. SMS (Short Message Service) is a text service that allows users of personal mobile communication terminals such as cellular / CDMA phones to send and receive short sentences of about 40 characters in real time without additional equipment. Such an SMS has the advantage of easy information delivery because information is provided interactively, and information is quickly and accurately delivered, and simple contents are very convenient because they can be easily delivered without having to make a phone call to the other party. Moreover, the SMS service enables the transmission of messages between mobile phones and personal computers as well as between mobile phones. Therefore, SMS is becoming an essential function in the digital mobile communication system.

Until now, these SMS services have been provided only between mobile phones or between mobile phones and personal computers.However, if the SMS service can be provided between DECT handsets, between DECT handsets and mobile phones, and between DECT handsets and personal computers by applying it to DECT, a digital cordless phone, It will be very convenient. In particular, in an office with a keyphone system where several DECT handsets are connected as a general extension terminal, it would be very convenient to be able to communicate simple instructions between employees using SMS services. However, none of the DECT products developed so far has an SMS message transmitting / receiving function. In particular, when the DECT handset is registered as an extension in the keyphone system as a general terminal, it is necessary to add a function for not only the DECT handset but also the keyphone system to provide SMS service. It wasn't.

Accordingly, an object of the present invention is to provide a method of providing an SMS service through a DECT handset registered as an extension in a keyphone system without software, without any additional equipment. Another object of the present invention is to provide an SMS message signal recognition and generation device for a key phone system and a key phone system in which the device is embedded.

It is a final object of the present invention to provide a method for enabling text transmission between DECT handsets registered as extensions to a keyphone system, between a PC and a DECT handset connected to the keyphone system, and between a keyphone telephone and a DECT handset.

According to an aspect of the present invention, there is provided a method for transmitting an SMS message using a DECT in a key phone system, the key phone system receiving a DTMF tone frequency informing transmission of an SMS message from an external trunk line; Recognizing receipt of an SMS and receiving an SMS message from an external trunk line; Generating SMS message data including a DECT handset extension number to receive the SMS message and transmitting it to the DECT interface board; Receiving, by the DECT interface board, the SMS message data, processing the SMS message according to the CLMS message specification and transmitting the SMS message to the DECT base station; Broadcasting, by the DECT base station, a CLMS message containing an SMS message through a broadcast channel; And extracting, by the corresponding DECT handset, the SMS message from the signal broadcast through the broadcast channel and displaying the same on the LCD screen.

In addition, a method for transmitting an SMS message using a DECT in a keyphone system includes the steps of: a DECT handset transmitting a call request signal to the keyphone system; When a call is connected between the DECT handset and the keyphone system, the DECT handset sends an SMS message transmission signal to the keyphone system, and the phone number of the other party's phone number entered by the user into the DECT handset, the phone number of the DECT handset, and the SMS message are the keyphone system. Transmitting to; Confirming, by the key phone system, whether the destination telephone number is an external trunk line or an extension DECT handset; And when the destination phone number is an external trunk line, the key phone system automatically connecting a call to the trunk line number where the SMS server exists and delivering an SMS message to the SMS server. If the destination telephone number is an extension DECT handset, processing the SMS message according to the DECT specification using the DECT interface board, and forwarding the SMS message to the corresponding extension DECT handset through a DECT base station to a broadcast channel; It is done.

Hereinafter, with reference to the accompanying drawings to be described in more detail with respect to the specific configuration and operation of the present invention.

Figure 1 shows the overall system configuration between the DECT and the key phone system for sending and receiving SMS messages in accordance with the present invention. As shown in FIG. 1, the overall system according to the present invention consists of a key phone system 10, an SMS receiver 20, a DECT interface board 30, a DECT base station 40 and a DECT handset 50. . The key phone system 10 accepts a limited number of 'line-numbered' trunk lines coming from the telephone company, and can be freely used in a plurality of extension terminals (e.g., key-phone or general telephones) each assigned a unique number, or a call is transferred and suspended. It is a communication system made to perform business efficiently and conveniently with various functions such as broadcasting, broadcasting and meeting. Although only DECT handset 50 is shown in FIG. 1 for convenience, other general landline telephones may also be connected together to a keyphone system as an extension terminal.

The DECT interface board 30 and the DECT base station 40 are required for the DECT handset 50 to be connected to the key phone system 10 once as an internal terminal. Since the key phone system is designed according to a general wired communication standard, a device for converting protocols between each standard is required to be connected to a DECT handset using the DECT protocol according to the DECT communication standard. It is the DECT interface board 30 that plays this role. The DECT interface board 30 processes the signal coming from the keyphone system 10 in accordance with the DECT protocol, and then transmits the signal from the DECT base station 40 to the DECT base station 40. The signal is processed and transmitted to the key phone system 10. Meanwhile, the DECT base station 40 is a device for wirelessly transmitting and receiving data with the DECT handset 50. The DECT base station 40 wirelessly transmits a signal from the DECT interface board 30 to the DECT handset 50 by RF processing. It receives a radio signal from the handset 50 and transmits it to the DECT interface board 30. The hardware connection between the key phone system 10, the DECT interface board 30 and the DECT base station 40 may typically be HDLC.

2 is a block diagram schematically showing the configuration of a typical DECT handset. As shown, the DECT handset 50 generally includes various functions of the handset 50 including a wireless signal processor 52 for transmitting and receiving RF signals, digital signal processing, coding / decoding of voice / digital signals, and the like. The control unit 54 for controlling the control unit, the memory unit 56 for storing data necessary for performing the function of the handset 50, the display unit 57 for displaying a variety of information to the user and the keypad unit 58 for information input It is configured to include. In order to support the SMS service, the DECT handset 50 should have a function of receiving / outgoing a text of about 40 characters. In other words, input and correction function of English letter should be supported for sending, and storage and scroll function of SMS message should be supported for receiving. The maximum number of messages that can be stored in a received SMS message is determined according to the storage capacity in the DECT handset 50. These functions, like other additional functions of the DECT handset 50, may be accomplished through a computer-executable program installed in the handset 50.

On the other hand, the SMS receiving device 20 serves to extract an SMS message from the call request signal when the SMS signal is included in the call request signal received from the trunk line or the extension to the key phone system. The detailed configuration of the SMS receiving apparatus 20 is already known and thus will be omitted.

Then, the process of providing the SMS service in the DECT handset and the key phone system configured as described above will be described in detail.

In the key phone system according to the present invention, the SMS message may be transmitted through various paths. For example, it may be transmitted from the DECT handset to another DECT handset, or from an application on a PC connected to the keyphone system to the DECT handset or vice versa. In addition, SMS messages can be transmitted between external trunk lines and DECT handsets and between single line telephones (SLTs) and DECT handsets that support SMS. Here, for convenience of explanation, an SMS message is transmitted from an external trunk line to a DECT handset through a key phone system, an SMS message is transferred from a DECT handset to a telephone of an external trunk line through a key phone system, and to the same key phone system. Only SMS messaging between two DECT handsets connected by extension is discussed.

First, with reference to FIG. 5, a case where an SMS message is transferred from an external trunk line to a DECT handset through a key phone system will be described. In general, when a call connection is attempted from a telephone exchange to a keyphone system, the exchange transmits a DTMF tone of a specific frequency to the keyphone system, which varies the frequency of the DTMF tone according to the type of service provided. Even when sending SMS messages, it is standard to transmit DTMF tones of a specific frequency. The key phone system 10 analyzes the frequency of the DTMF tone received through the external trunk line to determine whether an SMS message is to be transmitted from the external trunk line. If the signal input to the key phone system 10 is an SMS signal, the key phone system 10 transmits the signal to the SMS receiver 20. The SMS receiving apparatus 20 extracts only the SMS message from the input signal and delivers the SMS message to the key phone system 10. Upon receiving the SMS message from the SMS receiving device 20, the key phone system 10 transmits an ACK signal indicating that the message has been normally received through an external trunk line, and transmits the SMS message to the DECT interface board 30. In this case, the reason why the ACK signal is not transmitted from the DECT handset that finally receives the SMS message and not from the key phone system is that the SMS specification responds to the ACK signal to be received after the first SMS signal is sent from the source of the SMS message. This is because the waiting time is defined by a specific value. If the DECT handset transmits an ACK signal, there may be a problem in that it fails to respond within a prescribed time due to radio propagation delay and possibility of data loss on the radio. In the present invention, in order to avoid such a problem, the ACK signal is transmitted in the key phone system.

Meanwhile, the SMS message transmitted from the key phone system 10 to the DECT interface board 30 follows the following format. The first 1 byte indicates that this is an SMS signal, and its value should be set to distinguish it from other commands sent to the DECT interface board. For example, '00000001' may be used as a command indicating that the SMS signal. The second 1 byte contains the extension number of the DECT handset registered as an extension in the keyphone system. The next byte contains information indicating the length of the SMS message, and finally ASCII characters of the actual SMS message.

The DECT interface board 30 analyzes the data of the above-described format received from the key phone system 10, and if the first byte is an SMS command, converts it to a CLMS (Connectionless Message Service) message according to the standard specification of the DECT protocol, and then the DECT base. Station 40 is used to deliver an SMS message to DECT handset 50 via a broadcast channel. A CLMS message is a message used to convey simple information from a key phone system to a DECT handset without a call connection. The specific format is defined by 6.3.5 CLMS-message of DTS standard ETS 300 175-5. In other words, according to the CLMS-VARIABLE format, the IWU-TO-IWU offset allows DECT manufacturers to implement their own special services. 3 illustrates the format of an IWU-to-IWU information field and a user-defined field defined for an SMS service in the present invention. Shown in FIG. 3A is the general format of the IWU-to-IWU information field. As shown, the IWU-to-IWU information field is fixed with the first 1 bit as '1', and if the discriminator type information 7 bit is '0000001', the manufacturer can use the user-defined field to It means providing special services. FIG. 3 (b) shows the format of the user defined field according to the regulations, and FIG. 3 (c) shows the custom field format defined for the SMS message in the present invention according to the above regulations. As shown in the figure, the first byte includes the above-described identifier type field 1 byte, and the second byte corresponds to the user-defined field, and contains 1 byte of the EMC (Equipment Manufacturer Code) indicating the unique ID of the manufacturer. In addition, the third byte contains the length of the SMS message, and the remaining bytes contain the actual SMS message in the form of an ASCII code.

The DECT base station 40 carries a CLMS message of the above-described format on a broadcast channel and broadcasts it under the control of the DECT interface board 30. Signals broadcast over the broadcast channel include the number of a particular DECT handset. This broadcast signal is received by all DECT handsets registered as extensions to the keyphone system, but only the DECT handsets of the corresponding number read the CLMS message to extract the SMS message contained in the IWU-to-IWU information field. The DECT handset displays the extracted SMS message on the LCD and generates an audible tone indicating that an SMS message has been received. The user can then recognize it, check the received SMS message, and save or delete the confirmed SMS message. In this case, when the user selects to store, the SMS message is stored in the memory unit 56 such as the EEPROM. In this case, the number of messages that can be stored may be limited. 4 shows how an SMS message is received and displayed on the LCD display 57 of the DECT handset 50. As described above, the functionality of this DECT handset 50 can be implemented in software without adding a separate additional device.

This time, referring to FIG. 6, the process of transmitting an SMS message from the DECT handset 50 to an external trunk line or to another DECT handset in the key phone system 10 will be described. When sending an SMS message from the DECT handset 50 is implemented depending on the functionality of the DECT handset itself. The form would be similar to the general procedure for composing an SMS message in PCS. That is, the user enters the other party's phone number and his / her phone number in the SMS message sending mode using the keypad 58 of the DECT handset 50, composes a message of about 40 characters and presses the call key to make a call request. do. The call request signal is first transmitted to the key phone system 10 through the DECT base station 40 and the DECT interface board 30, and when a response is received from the key phone system 10, the key phone system 10 and the DECT handset 50 are received. The arc is connected once. The DECT handset 50 then sends a signal to the key phone system 10 to send an SMS message, which in turn sends an SMS message.

The key phone system 10 receives the SMS message, and then dials the phone number of the party to whom the SMS message is to be sent and delivers the SMS message. At this time, the key phone system 10 should be input in advance the CO line telephone number in which the SMS server exists. If the destination phone number to which the SMS message is to be sent is outside the key phone system, the SMS server automatically dials an existing trunk line number and then sends the received SMS message from the DECT handset 50. The SMS server of the external trunk line then forwards the SMS message to the destination telephone. The SMS server is omitted because it is beyond the scope of the present invention. Meanwhile, when the destination phone number is the DECT handset 50 in the key phone system, as described above, the SMS message may be delivered to the DECT handset by broadcasting the SMS message in the IWU-to-IWU information field through a broadcast channel. .

So far, a method of transmitting an SMS message using DECT in a key phone system has been described. The method described so far does not require any additional equipment, and can be simply implemented by changing operating software such as a keyphone system. On the other hand, it should be noted that the present invention is not limited to the above-described exemplary embodiments. Those skilled in the art may make various modifications to the present invention within the scope of the technical idea of the present invention.

So far, the configuration and operation of the present invention have been described in detail. As described above, according to the present invention, the SMS service can be provided through the DECT handset registered as an extension to the keyphone system without any additional equipment. Accordingly, it is possible to transmit texts between DECT handsets registered as extensions to the keyphone system, between a PC connected to the keyphone system and a DECT handset, and between the keyphone telephone and the DECT handset. Accordingly, in an office having a key phone system in which a plurality of DECT handsets are connected as a general extension terminal, it is possible to provide a convenience such as transmitting a simple instruction between employees using an SMS service.

Figure 1 shows the overall system configuration between the DECT and the key phone system for sending and receiving SMS messages in accordance with the present invention.

2 is a block diagram schematically showing the configuration of a typical DECT handset.

3 illustrates the format of an IWU-to-IWU information field and a user-defined field defined for an SMS service in the present invention.

4 shows how an SMS message is received and displayed on the LCD display of the DECT handset.

5 is a flowchart illustrating a process of transmitting an SMS message from an external trunk line to a DECT handset through a key phone system.

6 is a flow chart illustrating the process of sending an SMS message from a DECT handset to an external trunk line or to another DECT handset in a keyphone system.

※ Explanation of code about main part of drawing ※

10 ..... Keyphone system 20 ..... SMS receiving device

30 ..... DECT Interface Board 40 ..... DECT Base Station

50 ..... DECT handset 52 ..... wireless signal processor

54 ..... Control part 56 ..... Memory part

57 ..... Display section 58 ..... Keypad section

Claims (12)

Receiving, by the key phone system, a DTMF tone frequency informing transmission of an SMS message from an external trunk line; Recognizing receipt of an SMS and receiving an SMS message from an external trunk line; Generating SMS message data including a DECT handset extension number to receive the SMS message and transmitting it to the DECT interface board; Receiving, by the DECT interface board, the SMS message data, processing the SMS message according to the CLMS message specification and transmitting the SMS message to the DECT base station; Broadcasting, by the DECT base station, a CLMS message containing an SMS message through a broadcast channel; And And extracting the SMS message from the signal broadcast through the broadcast channel and displaying the SMS message on the LCD screen, wherein the DECT handset is performed. The method of claim 1, The step of receiving an SMS message from an external trunk line is: Analyzing the frequency of the DTMF tone received from the external trunk line and recognizing that an SMS signal is transmitted from the external trunk line; Receiving and transmitting an SMS signal to an SMS receiver and transmitting an ACK signal to an external trunk line; Extracting, by the SMS receiver, an SMS message; And And transmitting the extracted SMS message to the key phone system. The method of claim 1, The format of the SMS message data transmitted to the DECT interface board includes one byte indicating the SMS signal, one byte indicating the extension number of the DECT handset registered as an extension in the keyphone system, and one byte indicating the length of the SMS message. SMS message transmission method using the DECT in the key phone system, characterized in that consisting of the actual SMS message. The method of claim 3, wherein The SMS message transmission method using the DECT in the key phone system, characterized in that the actual SMS message is in the form of ASCII characters. The method of claim 1, The process of processing the SMS message according to the CLMS message specification by the DECT interface board may be performed by putting the SMS message in a user-defined field of the IWU-TO-IWU information field, which allows the DECT manufacturer to implement the manufacturer's own special service. SMS message transmission method using the DECT in the key phone system, characterized in that performed. The method of claim 5, wherein The format of the user-defined field of the IWU-TO-IWU information field used for the SMS message is characterized by consisting of 1 byte EMC indicating the manufacturer's unique ID, 1 byte indicating the length of the SMS message and the actual SMS message. SMS message transmission method using the DECT in the key phone system. The DECT handset sending a call request signal to the keyphone system; When a call is connected between the DECT handset and the keyphone system, the DECT handset sends an SMS message transmission signal to the keyphone system, and the phone number of the other party's phone number entered by the user into the DECT handset, the phone number of the DECT handset, and the SMS message are the keyphone system. Transmitting to; Confirming, by the key phone system, whether the destination telephone number is an external trunk line or an extension DECT handset; And If the destination phone number is an external trunk line, the key phone system automatically connects the call to the trunk line number where the SMS server exists and delivers an SMS message to the SMS server; If the destination phone number is an extension DECT handset, processing the SMS message according to the DECT specification using a DECT interface board, and forwarding the SMS message to the corresponding extension DECT handset through a DECT base station to a broadcast channel. SMS message transmission method using the DECT in the key phone system, characterized in that. The method of claim 7, wherein The method for transmitting an SMS message using the DECT in the key phone system, wherein the trunk line telephone number in which the SMS server exists is input to the key phone system. The method of claim 7, wherein The above steps for delivering an SMS message to the corresponding extension DECT handset are: Generating, by the key phone system, SMS message data including a DECT handset extension number to receive an SMS message to a DECT interface board; Receiving, by the DECT interface board, the SMS message data, processing the SMS message according to the CLMS message specification and transmitting the SMS message to the DECT base station; Broadcasting, by the DECT base station, a CLMS message containing an SMS message through a broadcast channel; And And extracting the SMS message from the signal broadcast through the broadcast channel and displaying the SMS message on the LCD screen, wherein the DECT handset is performed. The method of claim 9, The format of the SMS message data transmitted to the DECT interface board includes one byte indicating the SMS signal, one byte indicating the extension number of the DECT handset registered as an extension in the keyphone system, and one byte indicating the length of the SMS message. SMS message transmission method using the DECT in the key phone system, characterized in that consisting of the actual SMS message. The method of claim 9, The process of processing the SMS message according to the CLMS message specification by the DECT interface board may be performed by putting the SMS message in a user-defined field of the IWU-TO-IWU information field, which allows the DECT manufacturer to implement the manufacturer's own special service. SMS message transmission method using the DECT in the key phone system, characterized in that performed. The method of claim 11, The format of the user-defined field of the IWU-TO-IWU information field used for the SMS message is characterized by consisting of 1 byte EMC indicating the manufacturer's unique ID, 1 byte indicating the length of the SMS message and the actual SMS message. SMS message transmission method using the DECT in the key phone system.