KR101192168B1 - Wireless communication method for short range - Google Patents

Abstract

PURPOSE: A local area wireless communication method is provided to extend time for using a device by reduction of power loss. CONSTITUTION: A local wireless communication system transmits a recognition signal to a transceiver. The system reads out the transceiver by using one reflection signal(240). The system discriminates supportable communication standards in case the transceiver exists in a wireless communication enable area(250). The system is initialized by using the discriminated communication standards. [Reference numerals] (210) Receipt standby; (220) Recognition and initialization; (230) Data transception; (240) Recognition signal transmission and read; (250) Communication standard determination; (260) Initialization; (AA) Specific signal receipt; (BB) Period termination; (CC) Unprescribed response data receipt; (DD) Recognition failure; (EE) Recognition impossibility; (FF) Recognition; (GG) Communication completion; (HH) Initialization failure; (II) Determination impossibility & no response; (JJ) Recognition and initialization completion; (KK) Initialization completion; (LL) Communication standard determination

Description

Near field communication method {Wireless communication method for short range}

The present invention relates to a short range wireless communication method, and more particularly, to a method for recognizing a wireless transceiver existing in a communication area at a non-specified time point and transmitting and receiving data according to a communication method of the wireless transceiver.

RFID (Radio Frequency IDentification) is a communication method for transmitting and receiving data between a reader acting as a host and a tag acting as a client using a radio frequency signal. . The reader transmits the data along with the carrier wave to the tag, and the tag operates by using the electric energy contained in the carrier wave, and changes the resistance of the resistor installed in the antenna of the tag (Load modulation). The carrier transmits data to the reader by modulating the carrier wave transmitted from the reflected wave to the reader. Near Field Communication (NFC) integrates several communication standards (ISO 14443, JIX6319, Felica, Mifare, ISO 15693, ECMA340) using the 13.56Mhz frequency band to communicate on the same medium.

Transmitters and receivers applied to RFID and NFC communication methods do not always exist in an area where communication is possible, and after a tag or a target enters a transmission data reception area of a reader or an initiator. It is finally activated. In the case of a communication system based on the RFID communication method, in order to recognize a medium (transmission / reception device) supporting various types of communication standards, a separate recognition procedure for recognizing each individual medium must be performed. In the case of a communication system based on the NFC communication method, in order to recognize a transceiver that supports various types of communication standards, a periodic recognition procedure must be performed between an initiator as a host and a target as a client. do.

In general, in order to detect a transmitter / receiver approaching a wireless communication zone at any moment, it transmits specific data that can be mutually recognized periodically, and wireless communication is possible by receiving response data corresponding to the corresponding data transmitted from the receiver. Determine if there is a transceiver in the area.

Figure 1 shows the operation of the conventional NFC-enabled device.

Referring to FIG. 1, a NFC communication system supporting various communication standards (ISO14443A, ISO14443B, ISO15693, Mifare, Felica, ECMA340, etc.) sequentially transmits information request data of individual communication standards in order to determine various communication standards. Then, a series of processes of waiting for a response are repeatedly performed. From the response data, it is determined whether a transmission / reception device exists in the wireless communication available area, and a communication standard supported by the transmission / reception device is determined.

In the general NFC function transceiver, the reception standby state is relatively longer than the transmission time of data, and the transmission and response waiting time for the recognition of the transceiver is reduced in order to minimize power consumption.

However, in order to activate the communication in consideration of the user's convenience, it is necessary to set the response request data transmission and response waiting operation periods within a certain range.

The operation of a circuit that sends out specific data and receives response data to determine whether a transceiver is present in the radio communication enabled area consumes electrical energy. Cell phones or mobile communication devices use a battery that supplies a finite amount of power, and from the viewpoint of the usage time of the radio transceiver, the power consumed by the circuit that determines whether there is a transceiver in the radio communication area is also available. It can't be ignored.

The technical problem to be solved by the present invention is a data transmission and reception operation for determining whether the presence or absence (hereinafter referred to as the zone) of the transceiver included in the wireless communication possible region at any time and the communication standard of the transceiver confirmed the presence It is to provide a short-range wireless communication method that can minimize the electrical energy consumed.

The short-range wireless communication method according to an aspect of the present invention for achieving the technical problem, using a recognition signal transmission step for transmitting a recognition signal that does not include the response request data and the characteristics change of the transmitted recognition signal And determining a presence or absence of a transceiver in the short range wireless communication possible region.

The short-range wireless communication method according to another aspect of the present invention for achieving the above technical problem includes a reception standby step, a first information interchange step and a second information interchange step. The reception waiting step determines whether a signal has been received from a transceiver already determined to be included in the radio communication enabled area, and determines whether the presence or absence of a transceiver in the radio communication enabled area is necessary. In the first information interchange step, when it is determined that a signal is received from a transceiver that is determined to be included in a wireless communication coverage area, a specific initialization procedure is performed in a communication standard related to the transceiver, and the initialization procedure is performed. Send and receive data with one transceiver. In the second information interchange step, when it is determined that the determination of the existence or nonexistence of the transmission / reception apparatus in the wireless communication possible area is necessary, the random transmission of the recognition signal is performed at regular intervals to determine the existence of the transmission / reception apparatus, and the communication corresponding to the transmission / reception apparatus. After determining the standard and performing the initialization procedure of the transceiver, data is transmitted and received with the transceiver. Here, the recognition signal may not include response request data, regardless of whether the response request data is included or not, whether or not the criterion of discrimination is whether the response data is received or not. Means to do.

The short-range wireless communication method according to the present invention can shorten the time required for the recognition process in a short-range wireless communication system such as RFID or NFC, thereby reducing the power loss to extend the user's device usage time There is this.

In particular, when the recognition period is adjusted or the size of the recognition signal is adjusted, the recognition time can be further shortened, and the recognition distance can be extended.

Figure 1 shows the operation of the conventional NFC-enabled device.
2 is a state diagram of a short range wireless communication method according to the present invention.
3 shows time division of the short range wireless communication method according to the present invention.
4 illustrates a recognizable region and a communicable region in the short range wireless communication method according to the present invention.

In order to fully understand the present invention and the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings, which are provided for explaining exemplary embodiments of the present invention, and the contents of the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

The present invention proposes to determine the presence or absence of a transmission / reception apparatus within a short range wireless communication area by using a recognition signal capable of detecting a characteristic change regardless of whether the response request data or normal data is included.

That is, a short-range wireless communication area using the recognition signal transmitting step of transmitting any specific recognition signal capable of detecting the change of the transmission signal and the reflection signal characteristic according to the signal transmission and the characteristic change of the recognition signal transmitted. By performing each of the transceiver presence or absence determination steps for determining the presence or absence of the transceiver within the device, it is determined whether the transceiver is included in the short-range wireless communication possible area.

Here, the presence / absence of the transceiver may be determined by using the characteristic change of the reflected signal transmitted from the transmitting / receiving apparatus reflected in the wireless communication enabled area to the recognition signal transmitting apparatus, in addition to the characteristic change of the transmitting recognition signal. The presence / absence of a receiving device in the short range wireless communication possible area is determined. In particular, when one of the characteristic change of the recognition signal and the characteristic change of the reflected signal deviates from a predetermined threshold, the transmitting / receiving device is determined within the wireless communication possible area. .

Hereinafter, the above method will be described in detail.

2 is a state diagram of a short range wireless communication method according to the present invention.

2, the short-range wireless communication method 200 according to an embodiment of the present invention, the receiving standby step 210, the first information interchange step 220, 230 and the second information interchange step 240 , 250, 260, 230).

The reception standby step 210 determines whether a signal transmitted from a transceiver already determined to be included in the radio communication enabled area is received, and determines whether the presence or absence of a transceiver in the radio communication enabled area is necessary. .

The first information interchange step (220, 230) is performed when a signal is received from a transceiver that is determined to be included in the wireless communication coverage area, and in the communication standard corresponding to the signal received in the reception standby state 210 Recognition and initialization steps to perform the reception standby step 210 when performing a specific initialization procedure and when the initialization is not performed, when the strength of the received signal is weak or when the reception of the signal is not recognized. In addition, when the initialization procedure in the recognition and initialization step is completed, and a data first transmission and reception step 230 for transmitting and receiving data with the transceiver device.

The second information interchange step (240, 250, 260, 230) is performed when it is determined that the determination of the presence or absence of the transceiver in the radio communication possible area is necessary, the recognition signal transmission and reading step 240, the communication standard discrimination step 250, the initialization step 260 and the second transmission and reception step 230 are performed.

Recognition signal transmission and reading step 240 transmits the recognition signal at regular intervals, using the at least one of the change of the recognition signal and the change of the reflected signal of the recognition signal to read the presence of the transceiver in the wireless communication possible area, If it is determined that there is no device, the reception standby step 210 is performed.

The communication standard discrimination step 250 is performed when it is determined that the transceiver is present in the wireless communication possible area, and sequentially transmits a plurality of communication standard request data and receives response data to determine a supportable communication standard. If the communication standard cannot be determined or the response data cannot be received, the reception waiting step 210 is performed. If the response data is not specified, the recognition signal transmission and reading step 240 is performed. do.

The initialization step 260 performs initialization using the method defined in the determined communication standard, and if the initialization is not performed, the reception waiting step 210 is performed. The second transmitting / receiving step 230 transmits and receives data with the corresponding transceiver when the initialization step 260 is completed.

In this case, the first transmission and reception step 230 and the second transmission and reception step 230 have different names but the same part numbers. will be.

Here, the recognition signal is a carrier that does not include response request data or normal data.

The present invention proposes to determine that there is a transmitting / receiving apparatus in a wireless communication coverage area when one of a change in a recognition signal and a change in a reflection signal of the recognition signal deviates from a predetermined threshold. The threshold may be determined by experiments or by the experience of the user or producer, and may preset not only one threshold but also a plurality of thresholds and process them in different ways depending on the result of comparison with each threshold.

After determining that there is a transmitting and receiving device within a wireless communication possible section in the recognition signal transmission and reading step 240, the communication standard discrimination step 250 may be performed after a predetermined initialization preparation delay time has elapsed. This will be described later.

In the present invention, by adjusting the period of the recognition signal, by adjusting the time required for the recognition signal transmission and reading step 240 or by adjusting the size of the recognition signal, it is possible to adjust the range of the wireless communication possible area.

The size of the recognition signal used in the recognition signal transmission and reading step 240 may be the same as the size of the carrier including the data used in the second transmission and reception step 230, but may be different.

3 shows time division of the short range wireless communication method according to the present invention.

Referring to FIG. 3, the short range wireless communication method first transmits a recognition signal and determines it (1-1).

As already mentioned in the description of FIG. 1, the signal reception waiting section 2 performs the reception standby step 210 for a predetermined time in order to minimize power consumption. In the signal reception waiting section (2), is it necessary to receive a signal sent from another transceiver existing in the radio communication enabled area in the NFC-based transceiver or to determine the existence of the transceiver in the radio communication enabled area. In this section, in order to minimize the power consumption of the system, the power supply is limited so as not to perform other functions except the minimum function for the recognition of the transceiver. As a result of the determination of the reception standby step 210, after determining whether the presence or absence of the transmission / reception apparatus in the wireless communication possible area is necessary, the recognition signal is further transmitted and determined (1-2).

If the determination result (1-2) determines that there is a transceiver within the radio communication enabled area, it has an initialization preparation delay time (3) which is a time required for the transceiver to be initialized. Since the tag, a client constituting the RFID system, itself does not include a source of power, it operates using a carrier transmitted from a reader that is a host. The initialization preparation delay time (3) uses a carrier transmitted from a reader. Time required for initialization. Even in the case of target, which is a client of the NFC-based system, if the source of power supply is not included in itself, the target should be operated using the carrier transmitted from the initiator, which is the host. 3) The same is necessary.

After the initialization preparation delay time 3 elapses, the communication standard discrimination section 4 sequentially transmits request data for a plurality of supportable communication standards and receives a response thereto. Each of the plurality of communication standard discrimination sections 4-1, 4-2, 4-3, and 4-4 is divided into communication standard switching sections 5. After the communication standard is determined and the initialization is completed, the data transmission / reception section 6 transmits and receives necessary data to each other.

4 illustrates a recognizable region and a communicable region in the short range wireless communication method according to the present invention.

Referring to FIG. 4, the recognizable area and the communicable area are different from each other, which indicates the output size of the recognition signal used in the recognition signal transmission and readout step 240 and the data used in the second transmission / reception step 230. It can be achieved by varying the output size of the carrier included. If the size is the same, the recognizable area and the communicable area will be the same. It can be implemented by setting relatively small compared to the output size of the carrier including the data for.

Such limited communication area is defined in the communication standard for the purpose of limiting the communication area within a certain distance in the system based on RFID or NFC technology to improve the security of communication and limit the amount of power required. Is caused.

Referring to FIG. 3, the magnitudes (1-1, 1-2) of the recognition signals used in the recognition signal transmission and readout step 240 are larger than those of the signals used in the communication standard discrimination section 4. It can be easily understood that the recognizable area becomes wider than the communicable area.

Hereinafter, the technical basis of the present invention will be described.

In the present invention, it is proposed to use a carrier wave that does not include normal transmission / reception data or request data as a recognition signal. When the leader or initiator as a host emits a radio wave in free space, the signal is output according to the state of the free space. It is to use the characteristic is different.

In general, when a device receiving the signal is in close proximity, an output signal changes in amplitude due to a resonance phenomenon. The recognition signal output from the reader or initiator that transmits radio waves also changes the characteristics of the recognition signal when a tag or a target exists in the wireless communication enabled area. The present invention uses this phenomenon.

In the above description, the baseband wireless communication method including RFID and NFC has been described, but the present invention can be applied to a wireless charging method and a wireless charging system using an inductive charging method or a resonance charging method in addition to the short range wireless communication method. Similar effects can be expected in wireless systems that use load modulation similar to the illustrated scheme.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

1-1, 1-2: Recognition signal transmission and discrimination section 2: Receive standby
3: Delay time for initialization preparation
4-1, 4-2, 4-3, 4-4: Communication specification classification section
5: Transfer section 6: Data transmission section
210: waiting for reception step 220: recognition and initialization step
230: data transmission and reception step 240: recognition signal transmission and reading step
250: communication specification determination step 260: initialization step

Claims (13)

To determine the presence or absence of a transmission / reception apparatus within a wireless communication coverage area, a specific frequency capable of detecting a characteristic change can be detected regardless of whether the response request data is included without transmitting specific data and determining the validity of the response data. A recognition signal transmitting step of transmitting a recognition signal having; And
And a transmitter / receiver presence / determination step of determining whether a transceiver is present in a short-range wireless communication available area by using a characteristic change of the transmitted recognition signal. The method of claim 1, wherein determining whether or not the transceiver is present,
And determining whether there is a transmitting / receiving device in the short range wireless communication area by using a characteristic change in which an output characteristic of a recognition signal is changed. The method of claim 2,
The output characteristic change of the recognition signal is a short-range wireless communication method, characterized in that the output signal is determined that the transmitting and receiving device in the wireless communication possible zone when the amplitude amplification characteristics due to the frequency resonance is out of the threshold. A reception standby step of determining whether a signal has been received from a transceiver already determined to be included in the radio communication enabled zone, and determining whether a presence or absence of a transceiver in the wireless communication enabled zone (hereinafter referred to as zone portion) is necessary;
When it is determined that a signal is received from a transceiver that is determined to be included in a wireless communication coverage area, the controller performs a specific initialization procedure in a communication standard related to the transceiver, and transmits and receives data with the transceiver that performed the initialization procedure. A first information interchange step; And
If it is determined that the presence or absence of a transmission / reception device in a wireless communication possible area is necessary, the random transmission signal is transmitted at regular intervals to determine the existence of the transmission / reception device, the communication standard corresponding to the transmission / reception device is determined, and the transmission / reception device is And a second information interchange step of transmitting and receiving data to and from the transceiver device after performing an initialization procedure.
Wherein the recognition signal is a signal capable of detecting a characteristic change regardless of whether the response request data is included. The method of claim 4, wherein the first information interchange step includes:
When a specific initialization procedure is performed in a communication standard corresponding to a signal received in the reception standby state, and when initialization is not performed, one of the case where the strength of the received signal is weak and the reception of the signal is not recognized A recognition and initialization step of performing the reception standby step when And
And a first data transmission / reception step of transmitting / receiving data to / from the transceiver, when the initialization procedure is completed in the initialization step. The method of claim 5, wherein the second information interchange step,
The identification signal is transmitted at regular intervals, the presence or absence of a transmission / reception apparatus is read in a wireless communication enabled area by using at least one of a change in the recognition signal and a change in a reflection signal of the recognition signal. A recognition signal transmission and reading step for performing a reception standby step;
If it is determined that the transceiver is present in the wireless communication possible area, the plurality of communication standard request data are sequentially transmitted and response data is received to determine the supportable communication standard, and the communication standard cannot be determined or the response data can be determined. A communication standard discrimination step of performing the reception waiting step if it cannot receive the signal, and performing the recognition signal transmission and reading step if an undefined response data is received;
An initialization step of performing initialization using a method defined in the determined communication standard, and performing the reception standby step if initialization is not performed; And
And a second transmission and reception step of transmitting and receiving data with a corresponding transceiver device when the initialization step is completed. The method of claim 6,
And if a change in the recognition signal and a change in the reflected signal of the recognition signal deviates from a predetermined threshold value, the short range wireless communication method according to claim 1, wherein it is determined that there is a transmitting / receiving device in a wireless communication possible area. The method of claim 7, wherein
And in the transmitting and reading step of the recognition signal, determining that the transceiver exists within the wireless communication enabled section, and then performing the communication standard discriminating step after a predetermined initialization preparation delay time has elapsed. The method of claim 6,
And controlling the period of the recognition signal transmission and reading step by adjusting the period of the recognition signal. The method of claim 6,
And controlling the range of the wireless communication possible area by adjusting the magnitude of the recognition signal. The method of claim 6,
The recognition signal is a short-range wireless communication method, characterized in that the carrier does not contain the data to be transmitted and received. The method of claim 11,
The short range wireless communication method, characterized in that the output of the recognition signal used in the recognition signal transmission and reading step and the output of the carrier including the data used in the second transmission and reception step. The method of claim 7, wherein
And a method for adjusting a communication operation by inferring a reception state and a reception performance of a signal reception medium based on the recognized recognition signal change and the reflected signal variation.

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