JP5343800B2 - Transmitting apparatus, receiving apparatus, control method and program for transmitting apparatus, control method and program for receiving apparatus, and wireless communication system - Google Patents

Description

  The present invention relates to a transmission apparatus, a reception apparatus, a control method and program for the transmission apparatus, a control method and program for the reception apparatus, and a radio communication system, and in particular, a transmission apparatus for performing a communication synchronization operation using a preamble, and reception The present invention relates to a device, a control method and program for a transmission device, a control method and program for a reception device, and a wireless communication system.

In recent years, the spread of wireless communication capable of easily performing data communication without requiring large-scale equipment has been rapidly progressing, and various types of data can be transmitted and received by wireless communication not only in the office but also in the home. It is possible.
However, wireless communication has a problem that the accuracy of data transmission / reception is affected by the communication environment due to its characteristics. For example, in an environment where there are obstacles or obstructions that block radio waves, it is difficult to accurately transmit and receive radio signals containing the desired data, and data loss and communication errors are prominent. Become.

  For such a problem, a data transfer system as shown in Patent Document 1 is known. The technique disclosed in Patent Document 1 is a technique for increasing / decreasing an error correction code according to a communication situation and storing the error correction code in a data part in a packet structure of a radio frame. In other words, in a noisy environment where received radio waves deteriorate, this is a technique for ensuring communication quality by generating a packet structure of a radio frame with an enhanced amount of error correction code information that is resistant to communication errors. .

JP 2005-303495 A

However, since the technique of Patent Document 1 requires complicated control such as grasping the status of a communication error and increasing / decreasing the error correction code, it is difficult to easily realize such a technique.
In addition, the technique of Patent Document 1 is a data transfer technique for ensuring communication quality by dealing with a communication error caused by a communication environment, and considers suppressing the occurrence of a communication error without being influenced by the communication environment. Is not a technology.
For example, in a communication environment where a wireless communication path can be established (received preamble signal is received and clock synchronization is performed), but communication errors frequently occur due to lack of received data. In the first technique, since data loss is severe, there is a problem in that error correction processing continues endlessly and desired data cannot be received after all.

  The present invention has been made to solve the above-described problems, and provides a transmitting device and a receiving device that can transmit and receive desired information without being affected by the communication environment as long as a wireless communication path can be established. With the goal.

To achieve the above object, the transmission apparatus of the present invention includes a transmission order determining unit that determines a transmission order of preamble signals according to an input signal from the outside, and a transmission order determined by the transmission order determining unit. And a signal transmission unit that sequentially transmits the preamble signal.
Further, the receiving device of the present invention includes a reception signal detection unit that detects a preamble signal transmitted at different timing from a radio wave received from an antenna, and a reception order of the preamble signals detected by the reception signal detection unit. A reception information identification unit for identifying predetermined information and a reception information output unit for outputting the predetermined information identified by the reception information identification unit to the outside are provided.

  In addition, the signal transmission unit of the transmission apparatus according to the present invention transmits each preamble signal at a first interval based on the transmission order, and transmits the preamble signal according to the transmission order, and then transmits a second interval. And the preamble signal is transmitted again from the beginning of the transmission order, and the first interval is a time interval longer than the multipath delay time in the transmission signal, and the second interval is the first interval The time interval may be longer than the interval.

  In addition, the transmission signal generation unit in the transmission apparatus of the present invention may have a configuration including a transmission signal correspondence table in which an external input signal is associated with the transmission order of the preamble signal.

  Furthermore, the transmission signal generation unit in the transmission device of the present invention may determine the transmission order of a plurality of radio channels that output radio waves of different frequencies, or may change the transmission order of a plurality of preamble signals having different data arrangements. You may decide.

According to the present invention, by preparing a plurality of preamble signals to be used for establishing a wireless communication path, the transmission apparatus determines the transmission order of the plurality of preamble signals based on the transmission purpose information, and transmits the transmission signal. In addition to achieving reception synchronization (reception of preamble signals) of radio waves transmitted from the apparatus, desired information is identified based on the order of a plurality of received preamble signals.
Therefore, the transmission device and the reception device according to the wireless communication system of the present invention are in a communication environment that causes a communication error such that packet loss occurs in a wireless frame and data stored in the data portion cannot be determined in conventional wireless communication. However, if reception synchronization using a preamble signal is possible, desired information can be identified, that is, if a wireless communication path can be established, desired information can be transmitted and received without being affected by the communication environment. it can.

It is a block diagram which shows the structure of the radio | wireless communications system concerning the 1st Embodiment of this invention. It is a figure which shows an example of the transmission signal corresponding | compatible table or reception information identification table previously memorize | stored in the transmitter or receiver of the radio | wireless communications system concerning 1st Embodiment. It is a figure explaining the transmission timing of the preamble signal transmitted from the some radio channel in the transmitter of the radio | wireless communications system concerning 1st Embodiment. It is a flowchart which shows operation | movement of the transmitter of the radio | wireless communications system concerning 1st Embodiment. It is a flowchart which shows operation | movement of the receiver of the radio | wireless communications system concerning 1st Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system concerning 1st Embodiment. It is a block diagram which shows the structure of the radio | wireless communications system concerning the 2nd Embodiment of this invention. It is a figure which shows an example of the data arrangement | sequence table which memorize | stored the several preamble signal in the radio | wireless communications system concerning 2nd Embodiment. It is a figure which shows an example of the transmission signal corresponding | compatible table or reception information identification table previously memorize | stored in the transmitter or receiver of the radio | wireless communications system concerning 2nd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system concerning 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The wireless communication system according to the embodiment of the present invention transmits and receives predetermined information by transmitting and receiving a plurality of different preamble signals.
Note that the wireless communication system according to the present embodiment includes a fire alarm A1, a gas / CO detector A2, a human sensor, and emergency notification buttons A3 to A4 (hereinafter referred to as “interior”) installed in a building as shown in FIG. , These are collectively referred to as “emergency call device”), and the transmission data (emergency call signal) is sent to a security center D (for example, a security center such as a security company or gas company), a notification device C installed in a building, In the security control system that notifies the mobile phone terminal B1 and the like connected to the communication network B, the emergency call signal output from the emergency call device is transmitted and received wirelessly.

In addition, the radio communication system according to the present embodiment establishes a communication path between a transmission device and a reception device by transmitting and receiving a preamble signal.
Here, the preamble signal is a data string in which data of 1 and 0 are arranged with a predetermined regularity. A data array table storing preamble signals having such a data array is shared in advance between the transmitting side and the receiving side.
A preamble signal based on the shared data arrangement table is transmitted from the transmitting side, and a coincidence detection with the shared data arrangement table is executed for the data sequence of the preamble signal received by the receiving side. As a result, when the receiving side detects the coincidence between the data array stored in the data array table and the data string of the received preamble signal, reception synchronization is performed so that transmission data from the transmitting side can be received. That is, a communication path between the transmission device and the reception device is established.

[First Embodiment]
The wireless communication system according to the first embodiment of the present invention is intended to achieve reception synchronization of each wireless channel by transmitting and receiving preamble signals by a plurality of wireless channels that output radio waves of different frequencies. The predetermined information is transmitted and received by identifying the transmission order and the reception order.

As shown in FIG. 1, the configuration of the wireless communication system 1 according to the present embodiment includes information based on signals output from the security control box A (emergency notification signals from the emergency notification devices A1 to A4) as preambles. Transmitting device 11 for transmitting in correspondence with the transmission order of a plurality of radio channels for transmitting signals, and receiving a plurality of preamble signals transmitted from transmitting device 11, identifying the contents of the emergency notification signal, and performing a predetermined emergency notification The receiving device 12 is configured to operate.
Hereinafter, description will be made assuming that the radio communication system 1 according to the present embodiment has three radio channels (Ch (a), Ch (b), and Ch (c)).

The transmission device 11 includes a transmission order determination unit 111 and a signal transmission unit 112.
The transmission order determining unit 111 receives the emergency call signal output from the security control box A, and based on the transmission signal correspondence table in which the contents of the emergency call signal stored in advance and the transmission order of the preamble signal are associated with each other. The transmission order of the preamble signal corresponding to the received emergency call signal is determined.

Here, the relationship between the transmission signal correspondence table stored in advance in the transmission order determination unit 111 and the transmission order of the preamble signals will be described.
FIG. 2 is a diagram illustrating an example of a transmission signal correspondence table stored in advance in the transmission order determination unit 111. The transmission signal correspondence table shown in FIG. 2 is associated with emergency response signals output from the security control box A and corresponding data (3-bit information), and preamble signals between three radio channels for each corresponding data. The transmission order is determined.
The transmission order determination unit 111 determines correspondence data corresponding to the emergency call signal output from the security control box A based on the transmission signal correspondence table shown in FIG. 2, and determines the transmission order of the preamble signals representing the correspondence data. To do.

  For example, when an emergency call signal is output by the fire detector A1 shown in FIG. 1 and an emergency call signal with the content “fire detection” is output from the security control box A to the transmission order determination unit 111, the transmission order determination unit 111 determines that the corresponding data corresponding to the received emergency call signal “fire detection” is <010> based on the transmission signal correspondence table shown in FIG. 2 stored in advance, and a preamble signal representing the data <010> Determine the transmission order. The order of transmitting preamble signals in the case of data <010> is the first for the radio channel Ch (a), the second for Ch (c), and the third for Ch (b).

Based on the transmission order of the preamble signals determined by the transmission order determination unit 111, the signal transmission unit 112 repeatedly transmits the preamble signals from each radio channel a predetermined number of times at different transmission timings.
Different transmission timings at which the preamble signal is transmitted by the signal transmission unit 112, that is, the first interval which is the transmission interval between the radio channels is a time interval longer than the multipath delay time of the radio wave transmitted from each radio channel. The second interval, which is the transmission interval when transmitting the preamble signal from the beginning of the transmission order again, is a longer time interval than the first interval.

Here, with reference to FIG. 3, the transmission timing at the time of transmitting a preamble signal by the signal transmission part 112 is demonstrated in detail.
For example, transmission timing as shown in FIG. 3 from each radio channel of the signal transmission unit 112, that is, the transmission order is Ch (a) first, Ch (b) second, Ch (c) third, and preamble. When transmitting a signal, the signal transmission unit 112 transmits a preamble signal from Ch (a) having the first transmission order (transmission 1).

When the preamble signal is transmitted from Ch (a), the signal transmission unit 112 transmits the preamble signal from Ch (b) having the second transmission order after the first interval (section (A)) has elapsed (transmission 2). Similarly, a preamble signal is transmitted from the third Ch (c) after the first interval has elapsed (transmission 3).
When transmitting the third preamble signal in the transmission order, the signal transmission unit 112 transmits the preamble signal again from Ch (a) which is the head of the transmission order after the second interval (section (c)) has elapsed.

  At this time, the section (A) which is the first interval is a time interval longer than the multipath delay time (section (A)) of the preamble signal transmitted from each radio channel of the signal transmission unit 112, and the second interval The interval (section (c)) is defined as a time interval longer than the first interval (section (b)). This is because the multipath delay time (section (A)) fluctuates due to the influence of an obstacle or an obstacle existing between the transmission device 11 and the reception device 12, and each of the signal transmission units 112 reaching the reception side This is to prevent the order of the preamble signals transmitted from the radio channel, that is, the order of reception of the preamble signals in the receiving device 12 from being different from the order of transmission from the transmitting device 11.

Next, the configuration of the receiving device 12 will be described in detail.
The reception device 12 includes a reception signal detection unit 121, a reception information determination unit 122, and a reception information output unit 123.

The reception signal detection unit 121 detects preamble signals transmitted from the transmission device 11 at different timings by an antenna that receives radio waves transmitted from a plurality of radio channels of the transmission device 11, and sequentially stores the detected preamble signals. To do.
The reception information determination unit 122 identifies information associated with the reception order of the preamble signals detected and stored by the reception signal detection unit 121 based on a reception information identification table stored in advance. This reception information identification table is the same as the transmission signal correspondence table stored in advance in the transmission device 11, and the reception order of preamble signals between a plurality of radio channels is associated with predetermined information.
The reception information output unit 123 outputs information indicating the content of the emergency call signal identified by the reception information determination unit 122 to the outside.

Here, the relationship between the preamble signal detected and stored by the reception signal detection unit 121 and the reception information identification table stored in advance in the reception information determination unit 122 will be described.
FIG. 2 is a diagram illustrating an example of a reception information identification table stored in advance in the reception information determination unit 122. The reception information identification table shown in FIG. 2 is the same as the transmission signal correspondence table stored in the transmission order determination unit 111 of the transmission device 11, that is, the correspondence corresponding to the emergency notification signal from the security control box A. The reception order of the preamble signals received by each radio channel is determined for each data (3-bit information).
For example, when the reception order of the preamble signals detected and stored by the reception signal detection unit 121 is in the order of Ch (c), Ch (a), and Ch (b), the reception information determination unit 122 is shown in FIG. The corresponding data corresponding to the reception order of the preamble signals is determined as <100> based on the received information identification table shown, and the content of the emergency call signal indicated by the data <100> is identified as “CO detection”.

  Each component of the transmission device 11 and the reception device 12 in the wireless communication system 1 according to the present embodiment is realized by installing a computer program in a computer including a CPU (Central Processing Unit), a memory, and an interface. Each function of the transmission device 11 and the reception device 12 in the wireless communication system 1 described above is realized by cooperation of various hardware resources of the computer and the computer program (software).

Next, the operation of the wireless communication system 1 according to the present embodiment will be described with reference to FIGS.
FIG. 4 is a flowchart showing the operation of the transmission device 11 in the wireless communication system 1 according to the present embodiment. As shown in FIG. 4, when an emergency call signal is input from the outside to the transmission device 11 (S11), the transmission order determination unit 111 inputs based on the transmission signal correspondence table shown in FIG. 2 stored in advance. Correspondence data corresponding to the received emergency call signal is determined, and the transmission order of preamble signals representing the correspondence data is determined (S12).

  When the transmission order of the preamble signals is determined by the transmission order determination unit 111, the signal transmission unit 112 transmits the preamble signal from the first wireless channel having the transmission order (S13), and the transmission interval is the first interval. After elapse (S14), a preamble signal is transmitted from the second radio channel in the transmission order (S15). After the transmission of the second preamble signal and the elapse of the transmission interval, which is the first interval (S16), the preamble signal is transmitted from the third wireless channel whose transmission order is (S17).

After transmitting the third preamble signal in the transmission order, the signal transmission unit 112 determines whether or not the preamble signal transmission operation from these three radio channels has been repeated a predetermined number of times (S18).
For example, when the number of transmissions of the preamble signal is set in advance by the signal transmission unit 112, the signal transmission unit 112 determines whether or not the number of transmissions is the third.

  When the number of transmissions of the preamble signal from each channel is less than the predetermined number (“NO” in S18), the signal transmission unit 112 again sets the transmission order to 1 after the elapse of the second transmission interval (S19). Preambles are sequentially transmitted a predetermined number of times from the 3rd to 3rd radio channels (S13 to S18 are sequentially executed).

When the number of transmissions of the preamble signal from each channel has reached a predetermined number (“YES” in S18), the transmission device 11 ends the transmission operation of the preamble signal corresponding to the input emergency notification signal.
Further, the transmission device 11 may determine whether or not to end the operation of transmitting the preamble signal corresponding to the input emergency call signal depending on whether or not the reception completion notification transmitted from the reception device 12 is received. good.

Next, the operation of the receiving device 12 in the wireless communication system 1 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 5, the reception signal detector 121 of the reception device 12 detects and stores the preamble signal transmitted by the transmission device 11 from the radio wave received from the antenna (S21).

  When all the plurality of preamble signals transmitted from the transmitting apparatus 11 through different channels at a predetermined transmission timing are received, the reception signal detecting unit 121 determines the reception order of the received plurality of preamble signals (S22).

More specifically, the transmission timing of the preamble signal transmitted from the transmission device 11 and the reception timing of the preamble signal received by the reception device 12 are the same timing. That is, the transmission apparatus 11 and the reception apparatus 12 share in advance the first interval that is the transmission interval between the channels and the second interval that is the transmission interval when the preamble signal is repeatedly transmitted from the beginning of the transmission order. doing.
Therefore, the reception signal detection unit 121 determines the reception order of the plurality of received preamble signals by analyzing whether or not the reception signal is a preamble signal received after the elapse of the first interval or the second interval.

  When the reception order of the plurality of preamble signals received by the reception signal detection unit 121 is determined, the reception information determination unit 122 sets the reception order of the preamble signals based on the reception information identification table shown in FIG. 2 stored in advance. Corresponding corresponding data is determined, and the content of the emergency call signal assigned to the corresponding data is identified (S23). At this time, a reception completion notification signal indicating completion of reception of the emergency call signal may be transmitted to the transmission device 11 together.

When the content of the emergency notification signal is identified by the reception information determination unit 122, the reception information output unit 123 outputs information indicating the content of the emergency notification signal to the outside (S24), and a predetermined emergency notification operation is executed. .
For example, as shown in FIG. 1, the reception information output unit 123 outputs information indicating the content of the emergency notification signal to the notification device C installed in the building, and the siren ringing or emergency broadcast by the notification device C The information indicating the content of the emergency notification signal is transmitted to the mobile phone terminal B1 connected to the communication network B, and the emergency notification operation for the user by the mobile phone terminal B1 is executed.

Next, an emergency call signal transmission / reception operation in the wireless communication system 1 according to the present embodiment will be described with reference to a sequence diagram shown in FIG.
As shown in FIG. 6, when an emergency call signal is output from each of the emergency call devices A1 to A4 (S101), the same emergency call signal is transmitted from the security control box A to the transmission device 11 of the wireless communication system. (S102).

  The transmission device 11 that has received the emergency call signal transmitted from the security control box A determines the transmission order of the preamble signal corresponding to the received emergency call signal (S103), and the first wireless channel (Ch ( A preamble signal is transmitted from a)) (S104).

  The receiving device 12 detects the first preamble signal transmitted from Ch (a) of the transmitting device 11 to achieve reception synchronization, and stores the received preamble signal (S105-r). The transmission apparatus 11 that has transmitted the first preamble signal, after the elapse of the transmission interval that is the first interval (S105-t), transmits the preamble signal from the second radio channel (Ch (b)) in the transmission order. Is transmitted (S106).

  The receiving device 12 detects the second preamble signal transmitted from Ch (b) of the transmitting device 11 to achieve reception synchronization, and stores the received preamble signal (S107-r). In addition, the transmission apparatus 11 that has transmitted the second preamble signal transmits the preamble signal from the third wireless channel (Ch (c)) whose transmission order is after the elapse of the transmission interval that is the first interval (S107-t). Is transmitted (S108).

  The transmission apparatus 11 that has transmitted the preamble signal having the third transmission order sequentially repeats from the first transmission order (transmission from Ch (a)) after the elapse of the second transmission interval (S109-t). The preamble signal transmission is repeated a predetermined number of times (S110).

  When the receiving device 12 receives and stores the third preamble signal transmitted from Ch (c) of the transmitting device 11 (S109-r), the receiving device 12 determines the receiving order of the preamble signals received so far, and sets the receiving order to this receiving order. Based on this, the information content representing the emergency call signal transmitted from the transmission device 11 is identified (S111).

  The receiving device 12 that has identified the content of the emergency call signal transmits a reception completion notification to the transmission device 11 (S112), and outputs information indicating the content of the emergency call signal to the outside (S113). A notification operation of information indicating the content of the signal is executed (S114).

Thus, according to the wireless communication system according to the present embodiment, a plurality of received signals are transmitted and received by transmitting and receiving preamble signals from a plurality of wireless channels in a predetermined order in response to an emergency call signal input from the outside. Desired information can be identified based on the reception order of the preamble signals.
Therefore, the radio communication system according to the present embodiment is a preamble signal even in a communication environment in which packet loss occurs in a radio frame in conventional radio communication and a communication error is generated in which data stored in the data portion cannot be determined. If the reception synchronization can be performed, desired information can be transmitted and received. That is, if a wireless communication path can be established, desired information can be transmitted and received without being affected by the communication environment.

[Second Embodiment]
The wireless communication system according to the second embodiment of the present invention transmits / receives desired information by transmitting / receiving a plurality of preamble signals having different data arrangements in a predetermined order.
The configuration and function of the wireless communication system and the security control system including the wireless communication system according to the present embodiment are the same as those of the wireless communication system 1 and the security control system described in the first embodiment. The components having the same reference numerals are designated by the same reference numerals and detailed description thereof is omitted.

  FIG. 7 is a block diagram showing the configuration of the wireless communication system according to the embodiment of the present invention. As shown in FIG. 7, the configuration of the wireless communication system 1 according to the present embodiment is a transmission device that transmits information based on an emergency call signal output from the security control box A in accordance with the transmission order of preamble signals having different data arrangements. 21 and a receiving device 22 that receives preamble signals of different data sequences transmitted from the transmitting device 21, identifies the contents of the emergency notification signal, and performs a predetermined emergency notification operation.

The transmission device 21 includes a transmission order determination unit 211 and a signal transmission unit 212.
The transmission order determination unit 211 converts the emergency call signal output from the security control box A stored in advance into the received emergency call signal based on the transmission signal correspondence table that associates the transmission order of the preamble signal. A transmission order of a plurality of preamble signals having different corresponding data arrangements is determined.

The signal transmission unit 212 transmits each preamble signal at a predetermined transmission timing based on the transmission order of the preamble signals determined by the transmission order determination unit 211, and repeats this for a preset number of times.
Further, the predetermined transmission timing can be a transmission timing determined by a first interval that is a transmission interval between transmission orders and a second interval that is a time interval when transmitting again from the beginning of the transmission order. The first interval may be a time interval longer than the multipath delay time occurring between transmission orders, and the second interval may be a time interval longer than the first interval.

  Here, a data arrangement table storing a plurality of preamble signal data arrangements is shown in FIG. 8, and a transmission signal correspondence table storing the relationship between the contents of the emergency call signal output from the security control box A and the transmission order of the preamble signals. Is shown in FIG.

The transmission order determination unit 211 stores in advance a data array table of a plurality of preamble signals (preambles (a) to (c)) shown in FIG. 8 and a transmission signal correspondence table shown in FIG. Based on the correspondence table, the transmission order of the preamble signals (preambles (a) to (c)) corresponding to the emergency call signal output from the security control box A is determined.
The signal transmission unit 212 transmits the preambles (a) to (c) from the antenna in the determined transmission order.

The reception device 22 includes a reception signal detection unit 221, a reception information determination unit 222, and a reception information output unit 123 that outputs information indicating the content of the received emergency call signal to the outside.
The reception signal detection unit 221 detects a plurality of preamble signals transmitted from the transmission device 21 at a predetermined transmission timing, and identifies and sequentially stores the detected preamble signals based on a pre-stored preamble signal data array table. To do.
Here, the preamble signal data arrangement table stored in advance in the received signal detection unit 221 is the same as the preamble signal data arrangement table stored in the transmission order determination unit 211 of the transmission device 21. Is memorized.

  The reception information determination unit 222 identifies information associated with the reception order of the plurality of preamble signals detected and stored by the reception signal detection unit 221 based on a reception information identification table stored in advance. This reception information identification table is the same as the transmission signal correspondence table stored in advance in the transmission order determination unit 211 of the transmission device 21, and the reception order of a plurality of preamble signals and predetermined information are stored in association with each other. Yes.

More specifically, the reception information determination unit 222 determines the reception order of a plurality of preamble signals stored in the order of reception as identified by the reception signal detection unit 221.
Subsequently, the reception information determination unit 222 determines the correspondence data (corresponding to the reception order of the plurality of received preamble signals from the reception order of the determined preamble signals and the reception information identification table shown in FIG. 9 stored in advance. 3-bit information) is determined, and the contents of the emergency call signal assigned to the corresponding data are extracted.

  For example, when the reception order of a plurality of preamble signals is preamble (a), preamble (c), and preamble (b), the reception information determination unit 222 corresponds to the reception order from the reception information identification table shown in FIG. The attached correspondence data is determined as <010>, and the content of the emergency call signal indicating the data <010> is identified as “fire detection”.

  Each component of the transmission device 21 and the reception device 22 in the wireless communication system 2 according to the present embodiment is realized by installing a computer program in a computer including a CPU (Central Processing Unit), a memory, and an interface. The functions of the transmission device 21 and the reception device 22 in the wireless communication system 2 described above are realized by cooperation of various hardware resources of the computer and the computer program (software).

Next, an emergency call signal transmission / reception operation in the wireless communication system 2 according to the present embodiment will be described with reference to the sequence diagram shown in FIG.
As shown in FIG. 10, when an emergency call signal is output from each of the emergency call devices A1 to A4 (S201), a similar emergency call signal is also transmitted from the security control box A to the transmission device 21 of the wireless communication system. (S202).

  The transmission device 21 that has received the emergency call signal transmitted from the security control box A determines the transmission order of a plurality of preamble signals having different data arrangements corresponding to the received emergency call signal (S203), and the transmission order is 1 The th preamble signal (preamble (a)) is transmitted (S204).

The receiving device 22 detects the first preamble signal (preamble (a)) transmitted from the transmitting device 21 to achieve reception synchronization, determines the data arrangement of the received preamble signal, and receives the preamble (a). (S205-r).
The transmission device 21 that has transmitted the first preamble signal transmits the second preamble signal (preamble (b)) having the second transmission order after the elapse of the transmission interval that is the first interval (S205-t). (S206).

The receiving device 22 detects the second preamble signal (preamble (b)) transmitted from the transmitting device 21 to achieve reception synchronization, determines the data arrangement of the received preamble signal, and receives the preamble (b). (S207-r).
Also, the transmission device 21 that has transmitted the second preamble signal transmits the third preamble signal (preamble (c)) in the transmission order after the elapse of the transmission interval that is the first interval (S207-t). (S208).

  The transmission device 21 that has transmitted the third preamble signal (preamble (c)) in the transmission order again receives the first preamble signal (preamble) after the transmission interval that is the second interval has elapsed (S209-t). The transmission of the preamble signal is repeated a predetermined number of times sequentially from (a)) (S210).

  When the receiving device 22 receives and stores the third preamble signal (preamble (c)) transmitted from the transmitting device 21 (S109-r), the receiving device 22 determines the receiving order of the preamble signals received so far, and receives this received signal. Based on the order, the information content representing the emergency call signal transmitted from the transmission device 21 is identified (S211).

  The receiving device 22 that has identified the content of the emergency call signal transmits a reception completion notification to the transmission device 21 (S212), and outputs information indicating the content of the emergency call signal to the outside (S213). A notification operation of information indicating the content of the signal is executed by the notification device C or the like (S214).

As described above, according to the radio communication system according to the present embodiment, a plurality of preamble signals having different data arrangements in a predetermined order corresponding to an emergency call signal input from the outside are received and transmitted. Desired information can be identified based on the reception order of a plurality of preamble signals having different data arrangements.
Therefore, if a wireless communication path can be established, it is not affected by the communication environment, and desired information can be transmitted / received without requiring a complicated configuration such as transmitting / receiving preamble signals using a plurality of wireless channels. it can.

Install emergency call devices such as fire alarms, human sensors, gas detection sensors in rooms and living rooms,
In a security control system that notifies an emergency call signal from an emergency call device to a security center such as a security company, it can be used in a wireless communication system that transmits and receives an emergency call signal output from the emergency call device by wireless communication.

  DESCRIPTION OF SYMBOLS 1, 2 ... Wireless communication system 11, 21 ... Transmission apparatus, 12, 22 ... Reception apparatus, 111, 211 ... Transmission order determination part, 112, 212 ... Signal transmission part, 121, 221 ... Reception signal detection part, 122, 222: Received information determination unit, 123, 223 ... Received information output unit, A ... Security control box, A1-A4 ... Emergency call device (fire detector, gas / CO detector, emergency call button, bathroom call button), B ... communication network, B1 ... mobile phone terminal, C ... notification device, D ... security center.

Claims (11)

A transmission order determining unit that determines the transmission order of the preamble signals according to an input signal from the outside;
A transmission apparatus comprising: a signal transmission unit that sequentially transmits the preamble signals based on the transmission order determined by the transmission order determination unit. The transmission apparatus according to claim 1,
The signal transmission unit transmits each preamble signal at a first interval based on the transmission order, and transmits the preamble signal according to the transmission order, and then again at the second interval, the head of the transmission order again. Transmitting the preamble signal from
The first interval is a time interval longer than a multipath delay time in the transmission signal,
The transmission apparatus according to claim 1, wherein the second interval is a time interval longer than the first interval. The transmission device according to claim 1 or 2,
The transmission apparatus includes a transmission signal correspondence table in which an input signal from the outside and a transmission order of the preamble signal are associated with each other. The transmission device according to any one of claims 1 to 3,
The transmission apparatus according to claim 1, wherein the transmission order determining unit determines a transmission order of a plurality of radio channels that output radio waves having different frequencies. The transmission device according to any one of claims 1 to 4,
The transmission apparatus, wherein the transmission order determining unit determines a transmission order of a plurality of preamble signals having different data arrangements. A received signal detector that detects preamble signals transmitted at different timings from radio waves received from the antenna;
A reception information identification unit for identifying predetermined information based on the reception order of the preamble signals detected by the reception signal detection unit;
A reception apparatus comprising: a reception information output unit that outputs the predetermined information identified by the reception information identification unit to the outside. A transmission order determination step for determining the transmission order of the preamble signals according to an input signal from the outside;
And a signal transmission step of sequentially transmitting the preamble signals based on the transmission order determined by the transmission order determination step. A received signal detecting step for detecting a preamble signal transmitted at a different timing from a radio wave received from an antenna;
A reception information identification step for identifying predetermined information based on the reception order of the preamble signals detected by the reception signal detection step;
A reception information output step of outputting the predetermined information identified by the reception information identification step to the outside.   A control program for a transmission apparatus, which causes a computer to execute the control method for the transmission apparatus according to claim 7.   A control program for a receiving apparatus, which causes a computer to execute the receiving apparatus control method according to claim 8. In a wireless communication system comprising a transmission device that transmits a preamble signal from an antenna and a reception device that communicates with the transmission device by receiving the preamble signal from an antenna,
The transmission device is the transmission device according to any one of claims 1 to 5,
The wireless communication system, wherein the reception device is the reception device according to claim 6.

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