JP2015023304A - Radio communication network system, full-time operation radio terminal, radio communication method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication network system that is a system for transferring data to a collection destination while performing relay transfer by activation by a receiver driving system, and that prevents arrival delay of data to the collection destination by mitigating data congestion on the periphery of the collection destination and improves a communication arrival rate.SOLUTION: If a receiving radio terminal (N) becomes free itself, it broadcasts a [reception available] packet to a plurality of periphery transmitting radio terminals (O)-(R). Transmitting radio terminals (P) and (Q) having received the [reception available] packet transmit a [transfer request] packet. The [transfer request] packet stores information on a "priority flag" and a "network stay time". The receiving radio terminal (N) selects the transmitting radio terminal (P) as a transmitting terminal meeting a data transfer condition on the basis of this information, and transmits a [transfer request response] packet to the transmitting radio terminal (P). The transmitting radio terminal (P) having received this transmits a [transfer data] packet and finishes data transfer processing.

Description

  The present invention relates to a system that collects data of a large number of scattered data sources in one collection destination by wireless communication, and the distance from the data generation source to the collection destination is longer than the reach distance of wireless communication, The present invention relates to a wireless communication network system that can collect data at one collection destination by relaying data.

  In general, the wireless MAC (media access control) layer communication usually takes a 1: 1 communication form with one transmitting wireless terminal and one receiving wireless terminal. However, in rare cases, one transmitting wireless terminal is used. Broadcast format (multicast) in which the receiving wireless terminal is an unspecified number of broadcast communication (broadcasting) communication modes or one transmitting wireless terminal is selected by a transmitting wireless terminal from a plurality of receiving wireless terminals May be used. In addition, the method in which the transmitting wireless terminal selects and communicates from a plurality of receiving wireless terminals includes a method of performing communication between wireless terminals operating intermittently, a method of selecting a receiving wireless terminal among transmitting wireless terminals operating constantly, and the like. Are known.

  All of the above communication modes are systems in which one transmitting wireless terminal transfers data to a partner selected from a plurality of receiving wireless terminals. On the other hand, in a system in which data emitted from a large number of sources such as a sensor network is concentrated in one collection destination, a communication form of one receiving wireless terminal for many transmitting wireless terminals is a wireless MAC. Assumed in layer communication.

  FIG. 7 is a diagram for explaining a conventional wireless communication network system driven by a sender. In FIG. 7, a data source (white circle in the figure) and a data collection destination X (black circle in the figure) each exchange data by wireless communication. The reach of wireless communication is limited, and data from a data generation source that is far from the data collection destination X, for example, data generation sources I, K, M, O, P, R, Relaying is performed and data is finally transferred to the data collection destination X.

  In FIG. 7, as an example, the data generation source I, that is, the data generation source I that is a sender based on the transmitter driving method described later, takes the communication sequence and transfers the data to the data generation source A that is a receiver. This time, the data generation source A becomes the sender and transfers data from the data generation source A to the data collection destination X (black circle in the figure).

  In FIG. 7, the data generation source close to the data collection destination X becomes a data relay wireless terminal, and data is relayed and transferred from the data generation source I to the data collection destination X as indicated by arrows. As described above, in the wireless network system driven by the sender shown in FIG. 7, the distance from the data generation source to the data collection destination X is longer than the reach distance of the wireless communication, and a large number of wireless terminals are scattered by relaying data in the middle. Since the data of the data generation source to be transmitted is transferred to one place by wireless communication, each of the peripheral data generation sources close to the data collection destination X, for example, the data generation sources A, B, C, D, E, and F, respectively However, if the data to be transferred to the collection destination X is held almost at the same time, communication congestion occurs, resulting in data arrival delay and communication arrival rate deterioration due to communication congestion.

  FIG. 8 is a diagram illustrating an example of a communication sequence activated by a conventional sender drive. In FIG. 8, when a transmission event occurs (transfer data is held) at the transmitting wireless terminal, that is, the sender (N) in the illustrated example, a plurality of receiving wireless terminals existing in the vicinity, O), (P), receiver (Q), and receiver (R), (1) [transfer request] packet is broadcast. The receiver (P) and the receiver (O) who have received the [transfer request] packet return a (2) [transfer request response] packet. It is assumed that a [transfer request response] packet is not transmitted from another receiver (Q) or receiver (R) because, for example, another data cannot be newly received from the receiver (Q).

  The sender (N) selects (2) the receiver (O) that meets the data transfer conditions from the receiver (P) and the receiver (O) to which the [transfer request response] packet is transmitted. Then, the (3) [transfer data] packet is transmitted to the receiver (O), and the data transfer process is terminated.

  The sender (N) switches the own wireless terminal from the sender to the receiver after the data transfer processing is completed, and also receives the receiver (O), the receiver (P), the receiver (Q), and the receiver. When a transmission event occurs (holds transfer data) in any of (R), (1) to a plurality of receiving side wireless terminals existing in the vicinity, like the above-described sender (N). [Transfer Request] Packet is sent by broadcast. Then, in the same manner as described above, (2) a [transfer request response] packet is transmitted from any of the receivers that have received this [transfer request] packet, and any receiver that meets the data transfer conditions ( 3) [Transfer data] packet is transmitted and the data transfer process is terminated. Thereafter, the data transfer is continuously performed by repeating this communication sequence.

  FIG. 9 is a diagram for explaining an example of a packet transfer sequence of a conventional sender-driven system. When a transmission factor is generated in the transmitting wireless terminal P and data transmission is started, the wireless terminal P first transmits a packet T11 as a communication request (RREQ). The communication request (RREQ) is a request for a communication response from the receiver to the sender.

  A plurality of wireless terminals (only the wireless terminals Q and R are illustrated in the illustrated example) receive the communication request (RREQ) transmitted from the wireless terminal P to the peripheral wireless terminals almost simultaneously. To do.

  Since the wireless terminals Q and R on the receiving side do not have a response transmission timing generation unit in the wireless terminals, and the transmission timings for transmitting responses set in advance in the respective wireless terminals are set to be the same, When it is determined that relay transfer is possible in each unspecified wireless terminal that has received the communication request (RREQ) to the wireless terminal P that has transmitted the communication request (RREQ), a packet T12 as a communication response (RNO) is transmitted at the same timing. To do. For this reason, a communication response (RNO) collision occurs and communication ends abnormally.

  Thus, each wireless terminal in the conventional wireless communication network system determines that the receiving wireless terminal that has received the communication request (RREQ) sent from the transmitting wireless terminal can relay (transfer) In this case, a communication response (RNO) is transmitted by sending a response response (RNO) at the same response transmission timing in each reception-side wireless terminal without returning the response transmission timing of the other reception-side wireless terminal. (RNO) collision occurred and communication was terminated abnormally, so retransmission was forced.

  In the following Patent Document 1, a period in which data addressed to a wireless terminal apparatus other than its own wireless terminal apparatus is received, and a predetermined period after completion of reception of the data (for example, a wireless terminal that has transmitted data) Avoiding packet collisions by causing the wireless terminal device to transmit data to be transmitted, avoiding the period required for the device to determine whether or not the wireless terminal device addressed to it has successfully received data. A wireless communication system is described.

  Further, in Patent Document 2 below, regarding transmission packet scheduling in a wireless MAC (media access control) processing unit, the transmission priority of a traffic control packet is set higher than the transmission priority of a data packet, A high-reliability packet and a high-reliability packet are transmitted, the traffic control packet is a traffic control packet of a high-reliability packet, the traffic control packet is a delivery confirmation packet of a data packet, and the high-reliability packet is TCP ( A transmission packet scheduling method based on transmission control protocol is described.

JP 2002-290322 A JP 2006-245887 A

  Each of the wireless terminals constituting the conventional wireless communication network system does not have a response transmission timing generation unit in the wireless terminal, and the transmission timing for transmitting a response set in advance in each wireless terminal is set to be the same. Therefore, if it is determined that relay transfer is possible in each of the unspecified wireless terminals that have received the communication request to the wireless terminal that has transmitted the communication request, a communication response is collided by transmitting the communication response at the same timing. Occurs, and communication is terminated abnormally, so that there is a problem that the communication achievement rate of the network does not increase and communication resources cannot be effectively used.

  The above-described packet collision avoidance technique disclosed in Patent Document 1 is based on a time slot in which a wireless terminal device that has become a relay wireless terminal predicts the arrival of an echo and receives its packet transmission timing, and the subsequent time slot. Data is transmitted avoiding one time slot, and an unspecified transmitter wireless terminal that receives a “receivable” packet by broadcast transmission avoids duplication of “transfer request” packets. Not mentioned.

  Therefore, the present invention is a system in which data transmitted from a data generation source is transferred to a collection destination while a wireless terminal in the middle relays and transfers the data by activation by a receiver-driven method, and is congested in wireless terminals around the collection destination. An object of the present invention is to provide a wireless communication network system that alleviates the problem and prevents delays in data arrival at the collection destination and improves the communication arrival rate.

In order to achieve the above object, the wireless communication network system of the present invention is such that the distance from the data generation source to the collection destination is longer than the reach of wireless communication, and a wireless terminal having a reception function and a transmission function relays data on the way. In a wireless communication network system that collects in one collection destination by
One of the wireless terminals becomes a receiving wireless terminal that is a polling subject and receives a polling signal from the receiving wireless terminal that is a polling subject by the wireless terminal that has the data to be transferred generated at the data generation source A wireless communication network system that continues a communication sequence to be a transmission wireless terminal that transmits a response signal to the polling signal, and finally collects data from the data generation source with the collection destination being the reception wireless terminal. There,
The receiving wireless terminal is
Means for broadcasting a receivable packet indicating that the own wireless terminal is in a free state to surrounding transmitting wireless terminals;
Means for receiving a transfer request packet including information indicating the priority of data as a response to the receivable packet from the surrounding transmitting wireless terminals at a response transmission timing calculated by each transmitting wireless terminal;
Means for selecting a transmission wireless terminal from information indicating the priority included in the transfer request packet;
Means for transmitting a transfer request response packet to the selected transmitting wireless terminal;
Means for receiving a data packet from a transmitting wireless terminal that has received the transfer request response packet;
The transmitting wireless terminal is
Means for receiving a receivable packet transmitted from the receiving wireless terminal;
Means for transmitting a transfer request packet including information indicating the priority of data at the response transmission timing by obtaining a response transmission timing by calculation in the terminal when responding to the receivable packet;
Means for receiving a transfer request response packet from the receiving wireless terminal as a response to the transfer request packet;
Means for transmitting a data packet when the transfer request response packet is received;
It is characterized by that.

In the above, the information indicating the priority included in the transfer request packet includes a combination of a priority flag and a network residence time.
In the above, the priority is characterized in that when the priority flag is set and the network residence time indicates the longest time, the data having the highest priority is processed.

  Further, in the above, the priority is characterized in that when the priority flag is not set, the time when the network residence time indicates the longest time is processed as high priority data.

In order to achieve the above object, the wireless communication network system of the present invention randomly arranges a plurality of always-operating wireless terminals having a packet collision avoidance function, and each always-operating wireless terminal relays and forwards information to collect information. In a wireless communication network system for transmitting information to a constantly operating wireless terminal,
The constantly operating wireless terminal is:
A memory for storing at least the ID of the own wireless terminal;
When a receivable packet indicating a free state is broadcast from a normally operating wireless terminal that has become a receiving wireless terminal, the wireless terminal that has received the receivable packet transmits data to be transferred in its own wireless terminal. A packet control unit that instructs the response transmission timing generation unit to calculate a predetermined response transmission timing when it is held as a transmission wireless terminal;
When instructed to calculate the response timing from the packet control unit, the ID of the own wireless terminal stored in the memory is read, and the read ID of the own wireless terminal is multiplied by a predetermined coefficient. A response transmission timing generation unit that calculates a response timing and outputs the calculated response transmission timing to the packet control unit,
The packet control unit transmits a transfer request packet to the receiving wireless terminal that broadcasts the receivable packet at the response transmission timing output from the response transmission timing generation unit, and the receivable packet is broadcast. A plurality of transmitting wireless terminals that have received the transfer request packet and have transmitted the transfer request packet by the packet control unit of the receiving wireless terminal analyzing information indicating the priority included in the transfer request packet The selected transmission wireless terminal transmits a data packet by transmitting a transfer request response packet to the selected transmission wireless terminal, and the reception wireless terminal that has received the data packet is different. Control to receive a receivable packet broadcast from the receiving wireless terminal, and receive the receivable packet. Then, a transfer request packet is transmitted as a response, and when the transfer request packet is transmitted and selected as a transmission wireless terminal by the reception wireless terminal, a series of information transfer is completed by transferring the data packet. It is characterized by.

In order to achieve the above object, the always-operating wireless terminal of the present invention randomly arranges a plurality of always-acting wireless terminals having a packet collision avoidance function, and each always-acting wireless terminal relays and forwards information to collect information. A normally operating wireless terminal in a wireless communication network system for transmitting information to the always operating wireless terminal,
At least a wireless transmission circuit, a wireless reception circuit, a transmission / reception switching circuit, an antenna, and a control unit that controls the entire wireless terminal,
The control unit for controlling the entire wireless terminal is
A memory for storing at least the ID of the own wireless terminal;
When a receivable packet indicating a free state is broadcast from a normally operating wireless terminal that has become a receiving wireless terminal, the wireless terminal that has received the receivable packet transmits data to be transferred in its own wireless terminal. A packet control unit that instructs the response transmission timing generation unit to calculate a predetermined response transmission timing when it is held as a transmission wireless terminal;
When instructed to calculate the response timing from the packet control unit, the ID of the own wireless terminal stored in the memory is read, and the read ID of the own wireless terminal is multiplied by a predetermined coefficient. A response transmission timing generation unit that calculates a response timing and outputs the calculated response transmission timing to the packet control unit;
The control unit transmits a transfer request packet to a reception wireless terminal that has transmitted a receivable packet at a response transmission timing output from the response transmission timing generation unit to the packet control unit.

In order to achieve the above object, the wireless communication method of the present invention randomly arranges a plurality of always-operating wireless terminals having a packet collision avoidance function, and each always-operating wireless terminal relays and forwards information to collect information at the collection destination. A wireless communication method in a wireless communication network system for transmitting information to a constantly operating wireless terminal,
The normally operating wireless terminal becomes a receiving wireless terminal, and when the processing in the own wireless terminal is completed, a receivable packet indicating that the own wireless terminal is in a free state becomes a polling subject to the surrounding normally operating wireless terminals. Broadcast,
When the peripheral always-operating wireless terminal that has received the receivable packet holds the data to be transferred in its own wireless terminal, it becomes a transmitting wireless terminal so that the response transmission timing generation unit calculates a predetermined response transmission timing. Direct,
The response transmission timing generation unit in the own wireless terminal calculates the response transmission timing by multiplying the ID of the own wireless terminal stored in the memory by a predetermined coefficient, and sends the calculated response transmission timing to the packet control unit. Output,
The packet control unit sends a transfer request packet including information indicating the priority of data to the receiving wireless terminal that has transmitted the receivable packet at the response transmission timing output from the response transmission timing generating unit. The transmission wireless terminal transmits the transmission request response packet to the selected transmission wireless terminal by selecting the transmission wireless terminal from the information indicating the priority included in the transfer request packet. A data packet is received from.

In order to achieve the above object, a program for causing a computer of a reception-side normally operating wireless terminal according to the present invention to function causes a plurality of normally operating wireless terminals having a packet collision avoidance function to be randomly arranged, and each normally operating wireless terminal Is a computer of a reception-side always-operating wireless terminal in a wireless communication network system that relays information and transmits information to a collection-destination always-operated wireless terminal.
Means for transmitting a receivable packet indicating that the self-wireless terminal is in a free state to itself a receiving wireless terminal and indicating that it is in a free state;
Means for receiving a transfer request packet including information indicating the priority of data from a peripheral transmitting wireless terminal that has received the receivable packet;
Means for selecting a transmission wireless terminal from information indicating the priority included in the transfer request packet;
Means for transmitting a transfer request response packet to the selected transmitting wireless terminal;
Means for receiving a data packet from the selected transmitting wireless terminal;
To function as.

Further, in order to achieve the above object, a program for causing a computer of a normally operating wireless terminal on the transmission side of the present invention to function causes a plurality of always operating wireless terminals having a packet collision avoidance function to be randomly arranged, and each normally operating wireless terminal Is a computer of a normally operating wireless terminal on the transmitting side in a wireless communication network system that relays information and transmits information to a normally operating wireless terminal of a collection destination,
Means for receiving a receivable packet transmitted from the receiving wireless terminal when the normally operating wireless terminal becomes a receiving wireless terminal;
Means for transmitting a transfer request packet including information indicating the priority of data at the response transmission timing by obtaining a response transmission timing by calculation in the terminal when responding to the receivable packet;
Means for receiving a transfer request response packet from the receiving wireless terminal as a response to the transfer request packet;
Means for transmitting a data packet to the receiving wireless terminal when the transfer request response packet is received;
To function as.

  According to the present invention, the congestion at the wireless terminals around the collection destination in the system in which the data transmitted from the data generation source is transferred to the collection destination while the intermediate wireless terminal relays and transfers the data by the activation by the receiver driving method. As a result, it is possible to prevent a delay in data arrival at the collection destination and improve a communication arrival rate.

  In addition, since relay transfer is performed by activation by the receiver driving method, it is possible to transfer high priority data to the data collection destination in preference to normal data.

1 is a diagram illustrating a receiver-driven wireless communication network system according to an embodiment of the present invention. FIG. It is a figure which shows the example of a communication sequence started by the receiver drive which concerns on embodiment of this invention. It is a figure explaining the packet transfer sequence example of the receiver drive system which concerns on embodiment of this invention. It is a figure which shows the processing flow for implement | achieving the communication sequence started by the receiver drive shown in FIG. It is a figure which shows the structural example of the receiving radio | wireless terminal and transmission radio | wireless terminal for embodying the transfer sequence of the receiver drive system shown in FIG. It is a figure which shows the data format example of the transfer request which concerns on embodiment of this invention. It is a figure explaining the wireless communication network system by the conventional sender drive. It is a figure which shows the example of a communication sequence started by the conventional sender drive. It is a figure explaining the example of a packet transmission sequence of the conventional sender drive system.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a diagram for explaining a receiver-driven wireless communication network system according to an embodiment of the present invention. In FIG. 1, a data source (white circle in the figure) and a data collection destination X (black circle in the figure) each exchange data by wireless communication. The reach of wireless communication is limited, and data from a data generation source that is far from the data collection destination X, for example, data generation sources H, I, K, M, O, P, Q, R, and S, is halfway The data collection source, for example, data from the data generation source H, the wireless terminal A collects the data by a receiver-driven polling method, and relays the collected data to the data collection destination X to collect the data Data transfer to X is realized.

  Specifically, an example in which the receiving wireless terminal A collects data of the data generation sources (transmitting wireless terminals) H and I by a polling method driven by the receiver will be described with reference to FIG. In other words, based on the receiver driving method described later, when the processing in the wireless terminal A that is the receiver is completed (freed), the packet is forwarded by broadcasting the [Receivable] packet to neighboring wireless terminals. Polling is started with respect to the data generation sources H and I possessing the data to be processed. [Data Receivable] The data generation sources H and I that have received the packet simultaneously transmit a [Transfer Request] packet to the receiver A as a polling return signal. The receiver A selects, for example, the sender H in accordance with a predetermined selection procedure (which will be described later), and transmits a [transfer request response] packet to the sender H. As soon as the sender H receives the [transfer request response] packet, the sender H transmits a [transfer data] packet to the receiver A. Upon receiving this, the receiver A transmits a [transfer acknowledgment] packet to the transmitter H, thereby ending the data transfer from the data generation source H.

  When this processing is completed, the wireless terminal A broadcasts a “receivable” packet to neighboring wireless terminals again at the beginning of the next fixed period (see FIG. 2). Then, the data source I receives the broadcast-received [Receivable] packet and transmits a [Transfer Request] packet to the receiver A. The receiver A selects the sender I according to a predetermined selection procedure (described later), and transmits a [transfer request response] packet to the sender I. As soon as the sender I receives the [transfer request response] packet, it sends the [transfer data] packet to the receiver A. Upon receiving this, the receiver A transmits a [transfer acknowledgment] packet to the transmitter I, thereby ending the data transfer from the data generation source I. By doing so, the receiving wireless terminal A can collect data of the data generation sources H and I by a polling method driven by the receiver.

  Next, this time, the data collection destination X becomes the receiver, and the peripheral wireless terminals B, C, D, E, F, and G including the wireless terminal A are polled based on the polling method driven by the receiver, so that the final Therefore, data from all wireless terminals can be collected while the intermediate wireless terminal relays data. Since the data collection destination X serves as a receiver and collects data, the mechanism is the same as that of the wireless terminal A described above, so that the description thereof is omitted.

  As described above, in the wireless communication network system driven by the receiver shown in FIG. 1, the distance from the data generation source to the data collection destination X is longer than the reach distance of the wireless communication, and the wireless terminal relays data on the way. Since data of scattered data sources can be collected in one place by wireless communication, peripheral data sources near the data collection destination X, for example, data sources A, B, C, D, E, Even if each of F and G holds data to be transferred, data is not lost and data can be collected efficiently, so communication congestion and data arrival near the data collection destination X The communication arrival rate can be improved without causing a delay.

  FIG. 2 is a diagram showing an example of a communication sequence that is activated by a recipient drive according to the embodiment of the present invention. In FIG. 2, when the processing in the terminal is completed (becomes free) at the receiving wireless terminal (displayed as receiver (N) in the illustrated example), a plurality of transmitting wireless terminals existing in the vicinity (In the example shown, “Sender (O)”, “Sender (P)”, “Sender (Q)”, “Sender (R)”) (1) [Receivable] packet is sent as a polling signal. The (2) [Transfer Request] packet is transmitted as a polling return signal from the sender (P) and the sender (Q) that have received this [Receivable] packet. As shown in the data format shown in FIG. 6 (which will be described later), information on the “priority flag” and “network dwell time” is stored in the [transfer request] packet. One of the receivers is selected as the sender (N) that meets the data transfer conditions. In the illustrated example, an example is shown in which the sender (P) is selected as the sender. It is assumed that the above [transfer request] packet is not returned from other senders (O) and senders (R) because they do not have data to be transferred.

  The recipient (N) selects (2) the sender (P) that meets the data transfer conditions from the sender (P) and the sender (Q) to which the [transfer request] packet is returned, The sender (P) transmits (3) [transfer request response] packet to the sender (P), and the sender (P) receiving the packet transmits (4) [transfer data] packet, and ends the data transfer process. .

  The receiver (N) is activated at a fixed period and again broadcasts (1) [Receivable] packet as a polling signal. Upon receiving this [Receivable] packet, (2) [Transfer Request] packet is transmitted as a polling return signal from the sender (Q). The receiver (N) transmits (3) a [transfer request response] packet to the sender (Q) to which the (2) [transfer request] packet is returned, and the sender (Q) who receives the packet transmits the (3) [transfer request response] packet. (4) [Transfer data] packet is transmitted, and a series of data transfer processing is completed.

  The receiver (N) switches its own wireless terminal from the receiving wireless terminal to the transmitting wireless terminal after the series of data transfer processes is completed, and, for example, the sender (O), the sender (P), the transmission When one of the sender (Q) and the sender (R) becomes a wireless terminal on the receiving side and the processing in the own terminal is completed (freed), the above receiver (N) Similarly, (1) [Receivable] packet is broadcasted as a polling signal to a plurality of transmitting side wireless terminals existing in the vicinity. Similarly to the above, (2) [Transfer Request] packet is transmitted as a polling return signal from any of the senders who have received this [Receivable] packet as a polling signal. (3) A [Transfer Request Response] packet is sent, and from any of the above senders that have received this packet, the sender that matches the data transfer conditions (4) [Transfer Data] packet is sent and the data End the transfer process. Thereafter, the data transfer is continuously performed by repeating this communication sequence.

  FIG. 3 is a diagram for explaining an example of a packet transfer sequence of the receiver driving method according to the embodiment of the present invention. When the processing in the receiving side wireless terminal X is completed (freed), a [Receivable] (ROK) packet T11 indicating that data reception is possible is broadcast and polling is started. The packet T11 as “Receivable” (ROK) is a message that prompts the receiving side to receive the packet T12 as a polling response with a “transfer request” (TREQ).

  [Receivable] (ROK) packets broadcast from the wireless terminal X are received almost simultaneously by a plurality of wireless terminals (only the wireless terminals Y and Z are illustrated in the illustrated example) located around the wireless terminal X To do.

  When the wireless terminals Y and Z on the transmitting side receive the [Receivable] (ROK) packet, the wireless terminals Y and Z are assigned a number unique to each wireless terminal, for example, the wireless terminal, for a predetermined time, for example, T time. After a predetermined time obtained by multiplying the ID (identification number), a [transfer request] (TREQ) packet is transmitted. In the illustrated example, the wireless terminal Y on the transmission side transmits a packet T12 as a [transfer request] (TREQ) after Tα time, and the wireless terminal Z on the transmission side transmits a packet T12 as a [transfer request] (TREQ) after Tβ. Will be sent. Here, the transmission timings Tα and Tβ of the [transfer request] packet (TREQ) are set to Tα <Tβ.

  When the wireless terminal Y on the transmitting side receives the [Receivable] (ROK) packet, it transmits a [Transfer Request] (TREQ) packet after Tα time, and the wireless terminal Z on the transmitting side transmits [Transfer Request] (TREQ) after Tβ time. ) To avoid communication congestion due to collision by transmitting packets so that [Request to Transfer] (TREQ) packets do not collide.

  The packet T12 is transmitted from the transmitting wireless terminal Z to the receiving wireless terminal X after Tβ time. Thus, the wireless terminal X on the receiving side receives the [transfer request] (TREQ) packet from the wireless terminal Y on the transmitting side as a polling response from the wireless terminal Y on the transmitting side when the time Tα has elapsed, and from the wireless terminal Z on the transmitting side when the time Tβ has elapsed. [Transfer request] (TREQ) packet is received using packet T12 as a polling response. The wireless terminal X on the receiving side receives the [transfer request] (TREQ) packet from the wireless terminals Y and Z in this way without colliding, but the header of the [transfer request] (TREQ) packet. In the illustrated example, the wireless terminal Y is selected as the wireless terminal on the transmission side by analyzing the “priority flag” and “network residence time” information (which will be described later). Then, a packet T13 as a [transfer request response] (TNO) is transmitted from the receiving wireless terminal X to the selected transmitting terminal Y to the transmitting wireless terminal Y. The packet T14 is transmitted to the receiving wireless terminal X as [transfer data], and the packet T15 is transmitted from the receiving wireless terminal X to the transmitting wireless terminal Y as a [transfer acknowledgment].

  On the other hand, since the wireless terminal Z on the transmitting side finishes processing (becomes free) on the wireless terminal X on the receiving side and broadcasts the [Receivable] (ROK) packet at the beginning of the next cycle, And a [transfer request] (TREQ) packet is transmitted after Tβ time. If the wireless terminal X on the receiving side performs the same processing as above and selects the wireless terminal Z on the transmitting side, a packet T13 as [Transfer Request Response] (TNO) is transmitted to the wireless terminal Z on the transmitting side, On the other hand, the packet T14 is transmitted as [transfer data] from the wireless terminal Z on the transmission side to the wireless terminal X on the reception side, and further, the packet T15 is transmitted as [transfer acknowledgment] from the wireless terminal X on the reception side. It is transmitted to the wireless terminal Z on the transmission side.

  FIG. 4 is a diagram showing a processing flow for realizing the communication sequence activated by the recipient driving shown in FIG. The processing start at the beginning of the processing flow shown in FIG. 4 is started when the recipient shown in FIG. 2 has finished processing (becomes free). This communication sequence is started at a fixed period when the recipient ends the process (free).

First, in step S1, a receiving wireless terminal, that is, a receiver broadcasts a [receivable] packet to neighboring wireless terminals. In FIG. 4, the step is abbreviated as “S”.
Next, in step S2, the receiver receives a [transfer request] packet from a nearby transmitting wireless terminal, that is, a transmitter for a certain time after the receiver broadcasts the [receivable] packet. The data format of the [transfer request] packet is shown in FIG. 6, which will be described later.

  In step S3, the receiver determines whether or not a [transfer request] packet has been received. If there is no [transfer request] packet, the process ends. However, if there is a [transfer request] packet, the process proceeds to step S4, and the receiver determines whether or not there is a “priority flag”. The “priority flag” is information described in the header portion of the data format shown in FIG. 6 by the sender, and processing is divided depending on the presence or absence of the “priority flag”. That is, if there is no “priority flag”, the process proceeds to step S5. In step S5, the receiver sets the “wireless network dwell time” (hereinafter simply abbreviated as dwell time) in all [transfer request] packets. ) Selects the wireless terminal that has transmitted the longest [transfer request] packet, and proceeds to step S7. This “dwell time” is also the information described in the header part of the data format shown in FIG. 6 and represents the elapsed time since the data was issued from the data source, and the data is transferred to the data collection destination. The wireless terminal that relays data in the middle transfers the data to the next wireless terminal while updating the “residence time” (this will be described later), so the wireless communication network for the data can be monitored by monitoring the “residence time” The residence time at can be known.

  If there is a “priority flag”, the process proceeds to step S6. In step S6, the receiver selects the [transfer request] packet with the longest “residence time” in the presence of the “priority flag”. The process proceeds to step S7.

  In step S7, the receiver transmits a “transfer request response” packet to the sender selected in step S5 or S6. Next, the process proceeds to step S8, and a [transfer data] packet transmitted from the sender is received. With the above processing, the receiver finishes receiving the [transfer data] packet from the sender.

Next, the receiver who has received the [transfer data] packet will now be a sender, and the process for transmitting the [transfer data] packet to a radio terminal closer to the data collection destination than the own radio terminal will be described. . That is,
In step S8, the wireless terminal that has received the [transfer data] packet waits for the broadcast transmission of the [receivable] packet from the receiving wireless terminal closer to the data collection destination than the own wireless terminal, that is, the receiver in step S9. . If a [Receivable] packet is received from the receiver, a [Transfer Request] packet is transmitted in Step S10. Next, in step S11, a [transfer request response] packet transmitted from the receiver is awaited. In step S12, as in step S2, the transmission of a “transfer request response” packet is waited for a predetermined time, and the presence / absence of a [transfer request response] packet is determined. If it is determined in step S12 that no [transfer request response] packet is received within a predetermined time, the process returns to step S9 and the processes from step S9 to step S12 are repeated. On the other hand, if the [transfer request response] packet is received within a predetermined time in the determination in step S12, the process proceeds to step S13, and the series of processing is terminated by transmitting the [transfer data] packet in step S13. Return to step S1.

  FIG. 5 is a diagram illustrating a configuration example of a reception wireless terminal and a transmission wireless terminal for implementing the receiver-driven transfer sequence illustrated in FIG. As shown in FIG. 5, the always-operating wireless terminal 11 is divided into one receiving wireless terminal 11a and two transmitting wireless terminals 11b and 11c, but in consideration of the mode that the wireless terminal 11 can take. An example in which there are two transmission radio terminals 11b and 11c in the vicinity of one reception radio terminal 11a is shown, but there are more examples of transmission radio terminals 11b and 11c in the vicinity of one reception radio terminal 11a. It doesn't matter.

  In FIG. 5, the receiving wireless terminal 11a becomes the polling subject, and the [Receivable] (ROK) packet is broadcast from the receiving wireless terminal 11a to the surrounding transmitting wireless terminals as shown in FIG. Polling is performed when the two transmitting wireless terminals 11b and 11c receive almost simultaneously. The transmitting wireless terminals 11b and 11c that have received the “receivable” (ROK) packet receive the “transfer request” (TREQ) at the response transmission timings independently calculated by the response transmission timing generation units 33b and 33c in the control units 12b and 12c. ) Send the packet. In the illustrated example, the transmitting wireless terminal 11b transmits a “transfer request” (TREQ) packet after Tα time, and the transmitting wireless terminal 11c transmits a “transfer request” (TREQ) packet after Tβ time. Thus, the sequence shown in FIG. 3 described above is implemented so that the “transfer request” (TREQ) packet does not collide.

  In FIG. 5, the receiving wireless terminal 11a can receive the data generated by the packet control unit 32a by switching the switching unit 15a to the wireless transmission circuit 13a side when the processing in the own terminal is completed (when it becomes free). A [Receivable] (ROK) packet indicating that there is a broadcast is transmitted to the peripheral wireless terminals on the wireless communication network via the antenna 16a. Immediately after the broadcast transmission, the switching unit 15a is switched to the wireless reception circuit 14a side, and a [transfer request] (TREQ) packet transmitted from the transmission wireless terminals 11b and 11c is waited for a predetermined time. Then, when a [Transfer Request] (TREQ) packet is transmitted from a plurality of transmitting wireless terminals at different response transmission timings, all of them are received, and a transmitting wireless terminal that meets the data transfer conditions from among them, here a transmitting wireless The terminal 11b is selected, and a [transfer request response] (TNO) packet is transmitted to the selected transmission wireless terminal 11b. As soon as the transmitting wireless terminal 11b receives the “transfer request response” (TNO) packet, it transmits a [transfer data] packet to the receiving wireless terminal 11a. Then, when the transmitting wireless terminal 11b receives the [transfer acknowledgment] packet from the receiving wireless terminal 11a, the data transfer processing is completed.

  This will be described in more detail. The transmitting wireless terminal 11b includes “sender address (own terminal ID)” and “receiver address (receiving terminal) in the header part of the data format of the transfer request (TREQ) shown in FIG. ID) ”is stored, and a [Transfer Request] (TREQ) packet is transmitted as a polling response signal for the [Receivable] (ROK) packet. The receiving wireless terminal 11a switches the switching unit 15a to the receiving side immediately after broadcasting the [Receivable] (ROK) packet, and waits for a predetermined time to receive the [Transfer Request] (TREQ) packet as a polling response. When a [Transfer Request] (TREQ) packet is received from a plurality of transmission wireless terminals, here, the transmission wireless terminals 11b and 11c at different response transmission timings, the transmission wireless terminal that meets the data transfer conditions, here the transmission wireless terminal 11b , And a [transfer request response] (TNO) packet is transmitted to the selected transmission wireless terminal 11b. The transmitting wireless terminal 11b that has received the [transfer request response] (TNO) packet immediately transmits the [transfer data] packet. Then, the receiving wireless terminal 11a that has received this transmits a [transfer acknowledgment] packet, and the transmitting wireless terminal 11b receives this to end the data transfer processing.

  On the other hand, the transmitting wireless terminals 11b and 11c receive the broadcast-received [Receivable] (ROK) packet via the antennas 16b and 16c, the switching units 15b and 15c, and the wireless receiving circuits 14b and 14c, and perform packet control. The units 32b and 32c analyze the [Receivable] (ROK) packet and read the “own terminal ID” stored in the memories 31b and 31c and output it to the response transmission timing generation units 33b and 33c to generate the response transmission timing. The units 33b and 33c perform a predetermined calculation to calculate the response transmission timing of the transmitting wireless terminal, the response transmission timing generation units 33b and 33c output the response transmission timing obtained by the calculation to the packet control units 32b and 32c, The packet controllers 32b and 32c transmit a [transfer request] (TREQ) packet to the receiving wireless terminal 11a. .

  In the above, the packet control units 32b and 32c analyze the [Receivable] (ROK) packet, and know from the analysis result that the receiving wireless terminal 11a prompts the transmission of the [Transfer Request] (TREQ) packet. The wireless terminals 11b and 11c read the “own terminal ID” stored in the memories 31b and 31c and output it to the response transmission timing generators 33b and 33c, so that the response transmission timing generators 33b and 33c are as described above. The response transmission timing is calculated using “own terminal ID” as a key, and is output to the packet controllers 32b and 32c. As a result, as described above, the transmission wireless terminal 11b transmits a [transfer request] (TREQ) packet after Tα time, and the transmission wireless terminal 11c transmits a [transfer request] (TREQ) packet after Tβ time. Since Tα <Tβ is set here, the transmitting wireless terminal 11b transmits the [transfer request] (TREQ) packet first, and the transmitting wireless terminal 11c transmits the [transfer request] (TREQ) packet later. The receiving wireless terminal 11a selects one of the transmitting wireless terminals that meets the data transfer condition based on the header information stored in the [transfer request] (TREQ) packet transmitted from the transmitting wireless terminals 11b and 11c. Then, a [transfer request response] (TNO) packet is transmitted to the selected transmitting wireless terminal, here the transmitting wireless terminal 11b. Upon receiving this, the transmitting wireless terminal 11b immediately transmits a [transfer data] packet, and the receiving wireless terminal 11a receiving this transmits a [transfer acknowledgment] packet to the transmitting wireless terminal 11b to end the data transfer process. .

  More specifically, the reception wireless terminal 11a shown in FIG. 5 includes a control unit 12a that controls transmission / reception of information, a wireless transmission circuit 13a that transmits information wirelessly, and wireless reception that receives information transmitted wirelessly. The circuit 14a includes a switching unit 15a for switching transmission / reception of information, an antenna 16a for emitting and receiving information as radio waves, and an interface (not shown) for exchanging information with a host device (not shown). Yes. The control unit 12a can be connected to a host device that exchanges information via an interface (not shown), such as an information processing device such as a personal computer, a switch, a sensor, or a display device that constitutes an instrumentation device. Although not shown, electric power is supplied from an external power supply unit to the control unit 12a, the wireless transmission circuit 13a, the wireless reception circuit 14a, and the like so that the operation is always possible. Further, the control unit 12a is provided with a memory 31a, a packet control unit 32a, and a response transmission timing generation unit 33a.

  On the other hand, similarly to the receiving wireless terminal 11a, the transmitting wireless terminals 11b and 11c are transmitted wirelessly by the control units 12b and 12c that control the transmission and reception of information, and the wireless transmission circuits 13b and 13c that transmit information wirelessly. Wireless receiving circuits 14b and 14c for receiving information, switching units 15b and 15c for switching transmission / reception of information, antennas 16b and 16c for emitting and receiving information as radio waves, and a host device (not shown) An interface (not shown) for exchanging data is provided. The control units 12b and 12c can be connected to a host device that exchanges information via an interface (not shown), for example, an information processing device such as a personal computer, a switch, a sensor, or a display that constitutes instrumentation equipment. . Although not shown, power is supplied from an external power supply unit to the control units 12b and 12c, the radio transmission circuits 13b and 13c, the radio reception circuits 14b and 14c, and the like so that the operation is always possible. Has been. Further, the control units 12b and 12c are provided with memories 31b and 31c, packet control units 32b and 32c, and response transmission timing generation units 33b and 33c.

  In the memories 31b and 31c, terminal IDs (wireless terminal identifiers) uniquely assigned to the own wireless terminals, CPU / MPUs provided in the packet control units 32b and 32c, and response transmission timing generation units 33b and 33c are packetized. A predetermined application program or the like is stored for processing or calculating response transmission timing.

  The packet control units 32b and 32c include a CPU / MPU and the like, and are shown in the example of the packet transfer sequence of the receiver driving method shown in FIG. 3 using a predetermined application program stored in the memories 31b and 31c. It generates and analyzes various types of packets. The packet control units 32b and 32c analyze various packets including a [Receivable] (ROK) packet sent from the receiving wireless terminal 11a. At the time of transmission of the [transfer request] (TREQ) packet, the “priority flag” and “wireless network residence time” in the header part of the data format of the transfer request (TREQ) shown in FIG. , 31c, the information of “own terminal ID” is output to the response transmission timing generation units 33b, 33c. The packet control units 32b and 32c receive the response transmission timing calculated by the response transmission timing generation units 33b and 33c, and transmit a [transfer request] (TREQ) packet to the receiving terminal 11a at the received response transmission timing.

  The response transmission timing generation units 33b and 33c perform calculation by a CPU / MPU (not shown) on the basis of the information of “own terminal ID” stored in the memories 31b and 31c and perform response transmission timing, for example, the Tα time. And Tβ time is calculated. Note that the software for calculating the response transmission timing is stored in the memories 31b and 31c, and the response transmission timing generation units 33b and 33c access the memories 31b and 31c and appropriately capture them in the own apparatus. Furthermore, the response transmission timing generation units 33b and 33c have a timer function as part of the arithmetic processing, and activate the timer function at the time of input for generating the response transmission timing from the packet control units 32b and 32c. Then, at the time of transmission of the transfer request (TREQ) packet, the “wireless network residence time” in the header part of the data format of the transfer request (TREQ) shown in FIG. 6 is updated using the time obtained by the timer function. Here, the timer function is assumed to be exclusively a soft timer, but a hardware timer may be provided.

  FIG. 6 is a diagram showing a data format example of a transfer request according to the embodiment of the present invention. A transfer request (TREQ) is a transmission that has transfer data in response to the broadcast transmission of a [receivable] packet to a neighboring wireless terminal when the receiver has finished processing (free) within the terminal. The person prompts the receiver to receive the transfer request. At the beginning of the data format of the transfer request (TREQ), an area indicating that the command type is “transfer request command” is provided, and then a “header part” is provided. The “header part” is composed of “sender address (own terminal ID)”, “receiver address (reception destination terminal ID)”, “priority flag”, and “wireless network residence time”.

  Furthermore, each of the storage areas of “source address”, “destination address” and “data” set in the first data generation source is provided. The contents of these storage areas are embedded in the first data generation source. A wireless terminal that relays data does not enter this storage area and only relays data to the next wireless terminal (data collection destination). Send it to a nearby wireless terminal.

  Here, the “priority flag” will be described. In the wireless communication network system according to the embodiment of the present invention, as described above, the data is transferred while the data transmitted from the (first) data generation source is relayed and transferred by the wireless terminal activated by the receiver driving method. Prioritize data transfer to data collection destinations to reduce data concentration at wireless terminals around the data collection destination and reduce data arrival delay and deterioration of arrival rate due to communication congestion To achieve this, a “priority flag” storage area is provided in the header portion of the [transfer request] data format sent from the sender, and the [transfer request] (TREQ) packet in which the “priority flag” is set It is intended to enable data transfer to a data collection destination in preference to normal data received by a receiver and further received by another receiver.

  Specifically, when the “priority flag” is set by the sender having the transfer data, for example, for normal (periodic) data designed with the expectation of a communication arrival rate of around 90% In order to achieve a 99% communication arrival rate, for example, transfer data including “data that is highly urgent and should be notified urgently” and “data that includes a failure detection signal” The priority of data to be transferred is set by the wireless communication network of the present embodiment so that the “priority flag” is set so that the data is not lost due to excess.

  Next, “wireless network residence time” will be described. The wireless communication network system adopting the receiver driving method according to the embodiment of the present invention has a function of monitoring in advance so that data does not stay in the network forever in the same manner as the wireless communication network system adopting the sender driving method. It is built in the system, and the data that has stayed for a predetermined time by the monitoring function is designed to be lost from the system.

  For this reason, a “wireless network dwell time” storage area is provided in the header part of the data format of the above transfer request (TREQ) so that data in which dwell in the network is close to the disappearance time can be received. It is intended to preferentially perform data transfer to the data collection destination by updating the “wireless network residence time” in the data format of the transfer request (TREQ) by the wireless terminal that has become the sender. For this reason, in the embodiment of the present invention, the wireless terminal related to the transfer relay describes the elapsed time after the data is issued from the data generation source in the “wireless network residence time” area, and transfers the data to the data collection destination. In this case, the wireless terminal that relays data in the middle transfers the data to the next wireless terminal while updating the “wireless network residence time”. Therefore, by monitoring the “wireless network dwell time”, it is possible to immediately identify the time during which the data is dwelling in the wireless communication network. Therefore, data with a long “wireless network dwell time” is preferentially processed. As a result, it is possible to avoid data loss and transfer data to the data collection destination.

  The “priority” of the transfer data possessed by the sender can be represented by the combination of the “priority flag” and the “wireless network residence time” described above. In other words, the transfer data indicating that the “priority flag” is set and the “wireless network residence time” is the longest is processed as transfer data having the highest “priority” on the wireless communication network of this embodiment. . If the “priority flag” is not set, the transfer data indicating the longest “wireless network residence time” is processed as “priority” is high on the wireless communication network of this embodiment. .

  As described above, the “priority” is handled as a barometer indicating the urgency of the data by the “priority flag” and the “wireless network dwell time” in the wireless communication network system of the present embodiment. It is possible to determine whether the wireless terminal should process data with priority.

11a receiving terminal 11b, 11c transmitting terminal 12a, 12b, 12c control unit 13a, 13b, 13c wireless transmitting circuit 14a, 14b, 14c wireless receiving circuit 15a, 15b, 15c switching unit 16a, 16b, 16c antenna 31a, 31b, 31c memory 32a, 32b, 32c Packet control unit 33a, 33b, 33c Response transmission timing generation unit

Claims (9)

In the wireless communication network system in which the distance from the data generation source to the collection destination is longer than the reach of wireless communication, and a wireless terminal having a reception function and a transmission function collects data in one collection destination by relaying data,
One of the wireless terminals becomes a receiving wireless terminal that is a polling subject and receives a polling signal from the receiving wireless terminal that is a polling subject by the wireless terminal that has the data to be transferred generated at the data generation source A wireless communication network system that continues a communication sequence to be a transmission wireless terminal that transmits a response signal to the polling signal, and finally collects data from the data generation source with the collection destination being the reception wireless terminal. There,
The receiving wireless terminal is
Means for broadcasting a receivable packet indicating that the own wireless terminal is in a free state to surrounding transmitting wireless terminals;
Means for receiving a transfer request packet including information indicating the priority of data as a response to the receivable packet from the surrounding transmitting wireless terminals at a response transmission timing calculated by each transmitting wireless terminal;
Means for selecting a transmission wireless terminal from information indicating the priority included in the transfer request packet;
Means for transmitting a transfer request response packet to the selected transmitting wireless terminal;
Means for receiving a data packet from a transmitting wireless terminal that has received the transfer request response packet;
The transmitting wireless terminal is
Means for receiving a receivable packet transmitted from the receiving wireless terminal;
Means for transmitting a transfer request packet including information indicating the priority of data at the response transmission timing by obtaining a response transmission timing by calculation in the terminal when responding to the receivable packet;
Means for receiving a transfer request response packet from the receiving wireless terminal as a response to the transfer request packet;
Means for transmitting a data packet when the transfer request response packet is received;
A wireless communication network system.   2. The wireless communication network system according to claim 1, wherein the information indicating the priority included in the transfer request packet includes a combination of a priority flag and a network residence time.   3. The wireless communication network system according to claim 2, wherein the priority is processed as data having the highest priority when the priority flag is set and the network residence time indicates the longest time. Network system.   3. The wireless communication network system according to claim 2, wherein when the priority flag is not set, the priority is processed as data having a high priority when the network residence time indicates the longest time. A featured wireless communication network system. In a wireless communication network system in which a plurality of always-operating wireless terminals having a packet collision avoidance function are randomly arranged, and each always-operating wireless terminal relays and transfers information to transmit information to a collection-destination always-operating wireless terminal,
The constantly operating wireless terminal is:
A memory for storing at least the ID of the own wireless terminal;
When a receivable packet indicating a free state is broadcast from a normally operating wireless terminal that has become a receiving wireless terminal, the wireless terminal that has received the receivable packet transmits data to be transferred in its own wireless terminal. A packet control unit that instructs the response transmission timing generation unit to calculate a predetermined response transmission timing when it is held as a transmission wireless terminal;
When instructed to calculate the response timing from the packet control unit, the ID of the own wireless terminal stored in the memory is read, and the read ID of the own wireless terminal is multiplied by a predetermined coefficient. A response transmission timing generation unit that calculates a response timing and outputs the calculated response transmission timing to the packet control unit,
The packet control unit transmits a transfer request packet to the receiving wireless terminal that broadcasts the receivable packet at the response transmission timing output from the response transmission timing generation unit, and the receivable packet is broadcast. A plurality of transmitting wireless terminals that have received the transfer request packet and have transmitted the transfer request packet by the packet control unit of the receiving wireless terminal analyzing information indicating the priority included in the transfer request packet The selected transmission wireless terminal transmits a data packet by transmitting a transfer request response packet to the selected transmission wireless terminal, and the reception wireless terminal that has received the data packet is different. Control to receive a receivable packet broadcast from the receiving wireless terminal, and receive the receivable packet. Then, a transfer request packet is transmitted as a response, and when the transfer request packet is transmitted and selected as a transmission wireless terminal by the reception wireless terminal, a series of information transfer is completed by transferring the data packet. A wireless communication network system characterized by the above. Always-on operation in a wireless communication network system in which multiple normally-operating wireless terminals with packet collision avoidance functions are randomly arranged, and each always-operating wireless terminal relays and forwards information to transmit information to the normally-operating wireless terminal of the collection destination A wireless terminal, the always-operating wireless terminal is:
At least a wireless transmission circuit, a wireless reception circuit, a transmission / reception switching circuit, an antenna, and a control unit that controls the entire wireless terminal,
The control unit for controlling the entire wireless terminal is
A memory for storing at least the ID of the own wireless terminal;
When a receivable packet indicating a free state is broadcast from a normally operating wireless terminal that has become a receiving wireless terminal, the wireless terminal that has received the receivable packet transmits data to be transferred in its own wireless terminal. A packet control unit that instructs the response transmission timing generation unit to calculate a predetermined response transmission timing to the reception radio terminal when it is held,
When instructed to calculate the response timing from the packet control unit, the ID of the own wireless terminal stored in the memory is read, and the read ID of the own wireless terminal is multiplied by a predetermined coefficient. A response transmission timing generation unit that calculates a response timing and outputs the calculated response transmission timing to the packet control unit;
Have
The control unit transmits a transfer request packet to a reception wireless terminal that has transmitted a receivable packet at a response transmission timing output from the response transmission timing generation unit to the packet control unit. . Wireless communication in a wireless communication network system in which a plurality of always-operating wireless terminals having packet collision avoidance functions are randomly arranged, and each always-operating wireless terminal relays and forwards information to transmit information to the collection-destination always-operating wireless terminal A method,
The normally operating wireless terminal becomes a receiving wireless terminal, and when the processing in the own wireless terminal is completed, a receivable packet indicating that the own wireless terminal is in a free state becomes a polling subject to the surrounding normally operating wireless terminals. Broadcast,
When the peripheral always-operating wireless terminal that has received the receivable packet holds the data to be transferred in its own wireless terminal, it becomes a transmitting wireless terminal so that the response transmission timing generation unit calculates a predetermined response transmission timing. Direct,
The response transmission timing generation unit in the own wireless terminal calculates the response transmission timing by multiplying the ID of the own wireless terminal stored in the memory by a predetermined coefficient, and sends the calculated response transmission timing to the packet control unit. Output,
The packet control unit transmits a transfer request packet including information indicating the priority of data to a reception wireless terminal that has transmitted the receivable packet at the response transmission timing output from the response transmission timing generation unit; The receiving wireless terminal selects a transmitting wireless terminal from the information indicating the priority included in the transfer request packet, and transmits a transfer request response packet to the selected transmitting wireless terminal to transmit a data packet from the transmitting wireless terminal. A wireless communication method characterized by receiving. A receiving side in a wireless communication network system in which a plurality of always-operating wireless terminals having a packet collision avoidance function are randomly arranged, and each always-operating wireless terminal relays and forwards information to transmit information to a collecting-destination always-operating wireless terminal Always-on wireless terminal computer,
Means for transmitting a receivable packet indicating that the self-wireless terminal is in a free state to itself a receiving wireless terminal and indicating that it is in a free state;
Means for receiving a transfer request packet including information indicating the priority of data from a peripheral transmitting wireless terminal that has received the receivable packet;
Means for selecting a transmission wireless terminal from information indicating the priority included in the transfer request packet;
Means for transmitting a transfer request response packet to the selected transmitting wireless terminal;
Means for receiving a data packet from the selected transmitting wireless terminal;
Program to function as. A transmission side in a wireless communication network system in which a plurality of always-operating wireless terminals having a packet collision avoidance function are randomly arranged, and each always-operating wireless terminal relays and forwards information to transmit information to a collection-destination always-operating wireless terminal Always-on wireless terminal computer,
Means for receiving a receivable packet transmitted from the receiving wireless terminal when the normally operating wireless terminal becomes a receiving wireless terminal;
Means for transmitting a transfer request packet including information indicating the priority of data at the response transmission timing by obtaining a response transmission timing by calculation in the terminal when responding to the receivable packet;
Means for receiving a transfer request response packet from the receiving wireless terminal as a response to the transfer request packet;
Means for transmitting a data packet to the receiving wireless terminal when the transfer request response packet is received;
Program to function as.