JP2011166526A - Communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To guarantee opportunities of transmitting data packet and transmit the data packet at a better timing. <P>SOLUTION: When a return packet is not a response to data packet of a terminal, a transmission prohibited-period setting section 15 determines transmission timing of the data packet for the terminal on the basis of the reception timing of the return packet, and sets a slot period not including the determined transmission timing as a transmission timing prohibited-period in the second level that is set to be higher as it becomes lower than the first level and the reception power of the received return packet becomes larger. When the transmission timing prohibited-period is set over the period of a basic cycle of a transmission target that is configured including a plurality of slot periods, a transmission timing controller 18 transmits the data packet at the timing of a slot period wherein the transmission timing prohibited-period is set at the lowest level among the transmission timing prohibited-periods set over the period of the basic cycle of the transmission target. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication device and a program.

  2. Description of the Related Art Conventionally, there has been proposed a wireless system that transmits information by broadcasting (broadcasting) individual wireless terminal devices to surrounding wireless terminal devices without using a control station such as a base station. As an example of realizing such a communication form, in a CSMA (Carrier Sense Multiple Access) method, which is one of communication methods used in a wireless LAN, a terminal (node) that wants to transmit data is a packet of another terminal. The communication status is monitored (carrier sense), and transmission is started when the channel is free.

  In such a wireless system, for example, the terminal A monitors the communication status of a terminal that exists within a range where radio waves around it reach by carrier sense.

  For this reason, when there are many other terminals in the vicinity, there is a case where the timing for transmitting own data cannot be obtained and the data transmission is greatly delayed. For this reason, there is a problem that reliability cannot be guaranteed when the number of terminals and communication traffic increase.

  Furthermore, when there are many other terminals where direct carrier sense is not possible outside the radio wave reachable range, the communication status of these terminals cannot be detected, and when the terminal A itself transmits data, When colliding with communication (so-called hidden terminal problem) occurs. The wireless LAN has means for avoiding this communication collision using a method called RTS / CTS (Request To Send / Clear To Send). Although this method is effective when it is desired to communicate with a specific terminal, it cannot be applied in the case of broadcast communication, and thus there is a problem that it is impossible to avoid the collision of the packet communication.

  In order to solve the above problem, a method of accessing a frame by dividing the frame into n slots in time is proposed (see, for example, Patent Document 1). The wireless terminal device described in Patent Document 1 monitors slot occupancy information in units of frames, and exchanges information with other terminals by embedding slot occupancy information in a transmission packet in addition to transmission data of the terminal itself. To do. The frame is composed of, for example, 100 ms, and each slot is occupied by a different terminal.

  Furthermore, as shown in FIG. 2 of the document, the wireless terminal device of Patent Document 1 transmits a packet including data and frame information (FI). This frame information is information representing the occupied state of all slots detected by the own terminal. Since each frame requires such frame information, the data to be transmitted in one packet cannot be increased, and communication traffic may be congested.

  However, in the technique described in Patent Literature 1, although the peripheral terminal of the own terminal is detected, there are other terminals (so-called hidden terminals) that are detected by the peripheral terminal of the own terminal but not detected by the own terminal. Therefore, in Patent Document 1, an algorithm for detecting a hidden terminal is disclosed. However, since this is based on the presence of frame information, as described above, the transmission target data in one packet is determined. I can't do much. On the other hand, if frame information is not used, a hidden terminal is not detected, and there is a problem that a collision between the hidden terminal and the packet occurs.

  Therefore, in order to solve such a problem, a communication device that can suppress packet collision and improve communication performance has been proposed (for example, see Patent Document 2).

  In the communication device described in Patent Literature 2, when a reply packet is received from another terminal, a transmission timing prohibition period of the data packet of the terminal is set based on the reception timing of the received reply packet. In the communication device described in Patent Document 2, the data packet of the terminal is transmitted at a timing other than the transmission timing prohibition period.

JP 2007-28550 A JP 2009-177634 A

  In the technique described in Patent Document 2, for example, a situation may occur in which all one frame is set in the transmission timing prohibited period. In such a case, there is a problem that the data packet is not transmitted from the communication device, and the transmission opportunity of the data packet of the communication device is not guaranteed.

  In addition, when all of one frame is set in the transmission timing prohibition period, it may be possible to transmit the data packet at an arbitrary timing, but it is desirable to transmit the data packet at a more preferable timing.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a communication apparatus and program capable of guaranteeing a transmission opportunity of a data packet and transmitting the data packet at a more preferable timing. To do.

  In order to achieve the above object, the communication device of the invention according to claim 1 receives a data packet and a reply packet transmitted from another terminal, and receives the data packet and the reply packet; When a data packet is detected by the receiving means, a reply packet transmitting means for transmitting the reply packet after a period according to the detection result of the data packet, and when the reply packet is received by the receiving means In addition, when the reply packet received by the receiving means is a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the determined transmission A slot period not including the timing is set to a predetermined first level transmission timing. Set as a stop period, and when the reply packet received by the receiving means is not a reply to the data packet of the terminal, determine the transmission timing of the data packet of the terminal based on the reception timing of the received reply packet, Setting means for setting a slot period not including the determined transmission timing as a second level transmission timing prohibition period lower than the first level, and a basic period of a transmission target including a plurality of slot periods When the transmission timing prohibition period is set over the entire period, the slot in which the lowest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period of the basic period to be transmitted A transmission means for transmitting a data packet at the timing of the period; It is provided.

  According to the communication apparatus of the first aspect of the invention, when the setting means receives the reply packet by the receiving means, and the reply packet received by the receiving means is a reply to the data packet of the own terminal, The transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet, and a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period When the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the determined transmission timing A slot period not including a second level lower than the first level. It is set as the transmission timing prohibited period of Le. And when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the transmission means is set over the entire period of the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set in the transmission timing prohibition period.

  As described above, according to the present invention, when the received reply packet is not a reply to the data packet of the own terminal, the transmission timing prohibition period of the second level lower than the first level is included in the slot period not including the transmission timing. Is set. According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set in the transmission timing prohibition period.

  Here, the degree of prohibition of data packet transmission by the terminal in the transmission timing prohibition period determined by the reception timing of the reply packet that is a reply to the data packet of the terminal (the terminal transmits the data packet in the transmission timing prohibition period). The degree of prohibition of transmission) is higher than the degree of prohibition of data packet transmission by the terminal during the transmission timing prohibition period determined by the reception timing of the reply packet that is not a reply to the data packet of the terminal. This is a reply packet that is not a reply to the data packet of the own terminal includes, for example, a reply packet that is a reply to the data packet from the so-called hidden terminal, and when the own terminal or the hidden terminal is movable, This is because the possibility that the data packet transmitted from the own terminal collides with the data packet transmitted from the hidden terminal is reduced.

  According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set (that is, at the timing of the slot period having the lowest prohibition degree).

  Therefore, according to the present invention, it is possible to guarantee a data packet transmission opportunity and to transmit the data packet at a more preferable timing.

  In order to achieve the above object, a communication device according to claim 2 receives a data packet and a reply packet transmitted from another terminal, detects the data packet and the reply packet, and A receiving means for detecting the received power of the data packet and the reply packet; and a reply for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means Based on the reception timing of the received reply packet when the reply packet received by the receiving means is a reply to the data packet of its own terminal when the reply packet is received by the receiving means. Determine the transmission timing of the data packet of the terminal itself, and the determined transmission timing The slot period not included is set as a predetermined first level transmission timing prohibition period, and when the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the received reply packet The transmission timing of the data packet of the own terminal is determined based on the reception timing, the slot period not including the determined transmission timing is lower than the first level, and the received power of the received reply packet is large Setting means for setting as a second level transmission timing prohibition period determined so as to be higher, and the transmission timing prohibition period is set over the entire period of the basic period of the transmission target including a plurality of slot periods Is set over the entire period of the basic period to be transmitted. At the timing of slot periods lowest level transmission timing prohibited period set out transmission timing prohibited period, and a transmitting means for transmitting data packets.

  According to the communication device of the second aspect of the invention, when the setting means receives the reply packet by the receiving means, and the reply packet received by the receiving means is a reply to the data packet of its own terminal, The transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet, and a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period When the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the determined transmission timing A slot period that does not include a lower than the first level and received It is set as the transmission timing prohibited period of the second level defined to be higher as the magnitude of the received power of the reply packet. And when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the transmission means is set over the entire period of the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set in the transmission timing prohibition period.

  As described above, according to the present invention, when the received reply packet is not a reply to the data packet of the own terminal, the received power of the received reply packet is lower than the first level during the slot period not including the transmission timing. A second level transmission timing prohibition period is set so as to increase as the size increases. According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set in the transmission timing prohibition period.

  Here, the closer the position of the other terminal that transmitted the reply packet is to the position of the own terminal, the greater the received power of the reply packet. Also, the greater the number of other terminals that have transmitted the reply packet, the greater the received power of the reply packet. Therefore, when the received reply packet is not a reply to the data packet of the own terminal, the closer the position of the other terminal that transmitted the reply packet is to the position of the own terminal, and the greater the number of other terminals that transmitted the reply packet. The value of the second level of the set transmission timing prohibition period becomes high, and the degree of prohibition of data packet transmission by the own terminal in the transmission timing prohibition period (the terminal transmits the data packet in the transmission timing prohibition period) The degree of prohibition of doing) increases. That is, in the present invention, the closer the position of the other terminal that has transmitted the reply packet is to the position of the own terminal, and the greater the number of other terminals that have transmitted the reply packet, the more the transmission timing prohibition period is set in the slot period set. The degree of prohibition of data packet transmission by the terminal increases.

  According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set (that is, at the timing of the slot period having the lowest prohibition degree). Even if a data packet is transmitted in a transmission timing prohibition period determined based on a reply packet with low received power, the effect of packet collision is less, and the effect of packet collision occurs only at a distant terminal. Because.

  Therefore, according to the present invention, it is possible to guarantee a data packet transmission opportunity and to transmit the data packet at a more preferable timing.

  In order to achieve the above object, the communication device according to claim 3 includes a receiving means for receiving a data packet and a reply packet transmitted from another terminal, and detecting the data packet and the reply packet. A reply packet transmitting means for transmitting the reply packet after a period corresponding to the detection result of the data packet when the data packet is detected by the receiving means; and the reply packet is received by the receiving means. If the reply packet received by the receiving means is a reply to the data packet of the terminal, the transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet. A slot period that does not include the transmission timing is a predetermined first level transmission type. When the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet. Setting means for setting a slot period that does not include the determined transmission timing as a transmission timing prohibition period of a second level higher than the first level, and a basic transmission target configured to include a plurality of slot periods When the transmission timing prohibition period is set over the entire period of the cycle, the highest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period of the transmission target basic period. Transmission that transmits data packets at the timing of the slot period And a stage.

  According to the communication device of the invention described in claim 3, when the setting means receives the reply packet by the receiving means, and the reply packet received by the receiving means is a reply to the data packet of its own terminal, The transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet, and a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period When the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the determined transmission timing Slot periods that do not include the second level higher than the first level. It is set as the transmission timing prohibited period of Le. And when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the transmission means is set over the entire period of the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set in the transmission timing prohibition period.

  As described above, according to the present invention, when the received reply packet is not a reply to the data packet of the terminal, the second level transmission timing prohibition period higher than the first level is included in the slot period not including the transmission timing. Is set. According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set in the transmission timing prohibition period.

  Here, the permissible degree of transmission of the data packet by the own terminal in the transmission timing prohibition period determined by the reception timing of the reply packet that is a reply to the data packet of the own terminal (in this transmission timing prohibition period, the terminal transmits the data packet The degree to which transmission is permitted) is lower than the degree to which data transmission by the terminal is permitted during the transmission timing prohibition period determined by the reception timing of a reply packet that is not a reply to the data packet of the terminal. This is a reply packet that is not a reply to the data packet of the own terminal includes, for example, a reply packet that is a reply to the data packet from the so-called hidden terminal, and when the own terminal or the hidden terminal is movable, This is because the possibility that the data packet transmitted from the own terminal collides with the data packet transmitted from the hidden terminal is reduced.

  According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set (that is, at the timing of the slot period having the highest tolerance).

  Therefore, according to the present invention, it is possible to guarantee a data packet transmission opportunity and to transmit the data packet at a more preferable timing.

  In order to achieve the above object, a communication device according to claim 4 receives a data packet and a reply packet transmitted from another terminal, detects the data packet and the reply packet, and A receiving means for detecting the received power of the data packet and the reply packet; and a reply for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means Based on the reception timing of the received reply packet when the reply packet received by the receiving means is a reply to the data packet of its own terminal when the reply packet is received by the receiving means. Determine the transmission timing of the data packet of the terminal itself, and the determined transmission timing The slot period not included is set as a predetermined first level transmission timing prohibition period, and when the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the received reply packet The transmission timing of the data packet of the own terminal is determined based on the reception timing, the slot period not including the determined transmission timing is higher than the first level, and the reception power of the received reply packet is large Setting means for setting as a second level transmission timing prohibition period set so as to be lower, and the transmission timing prohibition period is set over the entire period of the basic period of the transmission target including a plurality of slot periods Is set over the entire period of the basic period to be transmitted. At the timing of been highest level slot period the transmission timing prohibited period is set within the transmission timing prohibited period, and a transmitting means for transmitting data packets.

  According to the communication device of the invention described in claim 4, when the setting means receives the reply packet by the receiving means, when the reply packet received by the receiving means is a reply to the data packet of its own terminal, The transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet, and a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period When the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the determined transmission timing A slot period that does not contain a higher than first level and received It is set as the transmission timing prohibited period of the second level which is set such that the larger the size of lower received power of the reply packet. And when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the transmission means is set over the entire period of the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set in the transmission timing prohibition period.

  As described above, according to the present invention, when the received reply packet is not a reply to the data packet of the own terminal, the received power of the received reply packet is higher than the first level in the slot period not including the transmission timing. A second-level transmission timing prohibition period that is set to be lower as the size is larger is set. According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set in the transmission timing prohibition period.

  Here, when the received reply packet is not a reply to the data packet of the own terminal, the closer the position of the other terminal that transmitted the reply packet is to the position of the own terminal, the more the number of other terminals that transmitted the reply packet. As a result, the value of the second level of the set transmission timing prohibition period becomes lower, and the transmission tolerance of the data packet by the own terminal in the transmission timing prohibition period (in the transmission timing prohibition period, the terminal transmits the data packet The degree to which transmission is permitted) is reduced. That is, in the present invention, the closer the position of the other terminal that has transmitted the reply packet is to the position of the own terminal, and the greater the number of other terminals that have transmitted the reply packet, the more the transmission timing prohibition period is set in the slot period set. The permissible degree of data packet transmission by the terminal itself is lowered.

  According to the present invention, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set (that is, at the timing of the slot period having the highest tolerance). Even if a data packet is transmitted in a transmission timing prohibition period determined based on a reply packet with low received power, the effect of packet collision is less, and the effect of packet collision occurs only at a distant terminal. Because.

  Therefore, according to the present invention, it is possible to guarantee a data packet transmission opportunity and to transmit the data packet at a more preferable timing.

  In order to achieve the above object, the program of the invention according to claim 5 is a computer program for receiving a data packet and a reply packet transmitted from another terminal and detecting the data packet and the reply packet. Means, when the data packet is detected by the receiving means, after a period according to the detection result of the data packet, the reply packet transmitting means for transmitting the reply packet, and the reply packet is received by the receiving means If the reply packet received by the receiving means is a reply to the data packet of the terminal, the transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet. A slot period that does not include the transmitted timing is set to a predetermined first record. If the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is set based on the reception timing of the received reply packet. And a setting means for setting a slot period not including the determined transmission timing as a second level transmission timing prohibition period lower than the first level, and a transmission including a plurality of slot periods When the transmission timing prohibition period is set over the entire period of the target basic period, the transmission timing prohibition period of the lowest level among the transmission timing prohibition periods set over the entire period of the basic period of the transmission target At the set slot period timing, the data packet Is a program for functioning as a transmitting means for transmitting the.

  According to the present invention, it is possible to guarantee a data packet transmission opportunity and transmit the data packet at a more preferable timing on the same principle as that of the communication device of the first aspect of the present invention.

  In order to achieve the above object, a program according to a sixth aspect of the invention provides a computer that receives a data packet and a reply packet transmitted from another terminal and detects the data packet and the reply packet. A receiving means for detecting reception power of the data packet and the reply packet; a reply for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means; Packet transmission means, when the reply packet is received by the reception means, if the reply packet received by the reception means is a reply to the data packet of its own terminal, based on the reception timing of the received reply packet Determine the data packet transmission timing of its own terminal The slot period not including the transmission timing is set as a predetermined first level transmission timing prohibition period, and when the reply packet received by the receiving means is not a reply to the data packet of the own terminal, it is received. The transmission timing of the data packet of the terminal is determined based on the reception timing of the return packet, and the slot period not including the determined transmission timing is set lower than the first level and the received power of the received return packet is large. Setting means for setting as a second level transmission timing prohibition period that is set so as to increase as the value increases, and the transmission timing prohibition over the entire period of the basic period of the transmission target including a plurality of slot periods If a period is set, the basic period of the transmission target At the timing of the lowest level slot period the transmission timing prohibited period is set of the set transmission timing prohibited period over a period, a program for functioning as a transmitting means for transmitting data packets.

  According to the present invention, it is possible to guarantee a data packet transmission opportunity and transmit the data packet at a more preferable timing on the same principle as that of the communication device of the second aspect of the present invention.

  In order to achieve the above object, a program according to an embodiment of the present invention provides a computer for receiving a data packet and a reply packet transmitted from another terminal, and detecting the data packet and the reply packet. Means, when the data packet is detected by the receiving means, after a period according to the detection result of the data packet, the reply packet transmitting means for transmitting the reply packet, and the reply packet is received by the receiving means If the reply packet received by the receiving means is a reply to the data packet of the terminal, the transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet. A slot period that does not include the transmitted timing is set to a predetermined first record. If the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is set based on the reception timing of the received reply packet. And setting means for setting a slot period not including the determined transmission timing as a second level transmission timing prohibition period higher than the first level, and a transmission including a plurality of slot periods When the transmission timing prohibition period is set over the entire period of the target basic period, the transmission timing prohibition period of the highest level among the transmission timing prohibition periods set over the entire period of the basic period of the transmission target At the set slot period timing, the data packet Is a program for functioning as a transmitting means for transmitting the.

  According to the present invention, it is possible to guarantee a data packet transmission opportunity and transmit the data packet at a more preferable timing on the same principle as that of the communication device of the third aspect of the present invention.

  In order to achieve the above object, a program according to an eighth aspect of the present invention is directed to a computer that receives a data packet and a reply packet transmitted from another terminal and detects the data packet and the reply packet. A receiving means for detecting reception power of the data packet and the reply packet; a reply for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means; Packet transmission means, when the reply packet is received by the reception means, if the reply packet received by the reception means is a reply to the data packet of its own terminal, based on the reception timing of the received reply packet Determine the data packet transmission timing of its own terminal The slot period not including the transmission timing is set as a predetermined first level transmission timing prohibition period, and when the reply packet received by the receiving means is not a reply to the data packet of the own terminal, it is received. The transmission timing of the data packet of the terminal is determined based on the reception timing of the return packet, and the slot period not including the determined transmission timing is set higher than the first level and the reception power of the received return packet is large. Setting means for setting as a second level transmission timing prohibition period that is set to be lower as the value is larger, and the transmission timing prohibition over the entire period of the basic period of the transmission target including a plurality of slot periods If a period is set, the basic period of the transmission target At the timing of the highest-level slot period the transmission timing prohibited period is set of the set transmission timing prohibited period over a period, a program for functioning as a transmitting means for transmitting data packets.

  According to the present invention, it is possible to guarantee a data packet transmission opportunity and transmit the data packet at a more preferable timing, based on the same principle as that of the communication device according to the fourth aspect of the present invention.

  As described above, according to the communication device and the program of the present invention, there is an effect that the transmission opportunity of the data packet is guaranteed and the data packet can be transmitted at a more preferable timing.

It is a block diagram which shows the structure of the communication apparatus of the radio | wireless communication network which concerns on embodiment of this invention. It is a figure which shows the structure of a basic period (frame) when a data packet is transmitted / received periodically. It is a state transition diagram of this communication apparatus. It is a flowchart which shows the process routine of a "data packet transmission process". It is a flowchart which shows the process routine of the "reply packet reception process with respect to the data of the own terminal." It is a timing chart for demonstrating a transmission prohibition period. It is a flowchart which shows the processing routine of a "signal reception process". It is a flowchart which shows the processing routine of a "reply packet transmission process".

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a communication device of a wireless communication network according to the first embodiment of the present invention. The wireless communication network is dynamically configured by each communication device broadcasting a packet. Hereinafter, as necessary, a communication device to be described is referred to as an own terminal, and a communication device around the own terminal is referred to as a peripheral terminal or another terminal.

  The communication device includes a receiving circuit 12 that receives a packet (for example, a data packet and a reply packet) transmitted from another wireless terminal device (a communication device in the vicinity of the own terminal) via the receiving antenna 11, and a received packet. Detects and detects at which slot (at which timing) the packet is transmitted, and also detects the received power of the packet by detecting the received power of the packet and demodulating the data transmitted from the detected packet. When the packet demodulator 14 to be generated and the received reply packet are a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received packet. The slot period that does not include the reply timing is set to a predetermined first level (for example, the first level). When the received reply packet is not a reply to the data packet of the terminal, the data of the terminal is determined based on the reception timing of the received reply packet. The packet transmission timing is determined, and the slot period that does not include the determined transmission timing is lower than the first level and the received power of the return packet (received reply packet) detected by the packet detector 13 is large. The second level determined to increase as the value increases (that is, when the value of the first level is X, the value of the second level is less than X and the received power of the return packet) And a transmission prohibition period setting unit 15 that sets the transmission timing prohibition period as the transmission timing prohibition period increases. To have. The receiving circuit 12 and the packet detecting unit 13 are an example of receiving means of the present invention. The transmission prohibition period setting unit 15 is an example of a setting unit according to the present invention. In the present embodiment, the lower limit value of the second level value is set to a value larger than zero.

  Further, the communication apparatus includes a packet generator 16 that generates a data packet based on transmission information, a reply packet generator 17 that generates a reply packet based on the demodulated packet, and a transmission timing controller that controls transmission timing. 18, a transmission circuit 19 that transmits the generated packet via the antenna 20, and a control circuit 30 that controls the overall operation.

  The transmission timing control unit 18 controls the transmission timing of the data packet generated by the packet generation unit 16 and the return packet generated by the return packet generation unit 17 with respect to the transmission circuit 19.

  FIG. 2 is a diagram illustrating a configuration of a basic period (frame) when data packets are periodically transmitted and received. One basic period is divided into a plurality of slots, and is set to 100 msec, for example. In the present embodiment, only two types of data packets and reply packets are used, and a period including the data packets and reply packets is one slot. One slot is divided into a data transfer (DATA) period, a reception detection (ACK) period, and a collision detection (COL) period. Thereby, reception detection and collision detection are distinguished at the reception timing of one reply packet.

  Note that the transmission prohibition period setting unit 15 shown in FIG. 1 resets or cancels the transmission prohibition period depending on whether the return packet is detected in the reception detection period or the collision detection period.

  Further, it can be seen whether or not the packet has been successfully received based on the demodulation result of the packet demodulator 14. In any case, the reply packet generator 17 generates only one type of reply packet.

  The transmission timing control unit 18 controls the transmission timing of the data packet generated by the packet generation unit 16 and the return packet generated by the return packet generation unit 17 with respect to the transmission circuit 19. The transmission timing control unit 18 controls the transmission circuit 19 to transmit the data packet during the data transfer period.

When the reception of the data packet is successful, the transmission timing control unit 18 controls the transmission circuit 19 so as to transmit the reply packet after T _{rep_ACK} (reception detection period) from the reception timing of the data packet. The transmission timing control unit 18 controls the transmission circuit 19 so as to transmit a reply packet after T _{rep_COL} (collision detection period) from the reception timing of the data packet, particularly when the reception of the data packet is not successful. To do.

  FIG. 3 is a state transition diagram of the communication apparatus. The communication apparatus transits the states of “reception standby state”, “data packet transmission process”, “reply packet reception process for data of own terminal”, “signal reception process”, and “reply packet transmission process”.

  Specifically, in a reception standby state, the communication apparatus shifts to a data packet transmission process when there is no reception signal and there is data to be transmitted, and shifts to a signal reception process when a reception signal is detected.

  When the data packet cannot be transmitted in the data packet transmission process, the communication apparatus shifts to a reception standby state. When the data packet transmission process is completed, the communication apparatus shifts to a reply packet reception process for the data of the terminal itself. Then, in the reply packet reception process for the data of the terminal itself, the communication apparatus shifts to a reception standby state when the process is completed or when a predetermined period has elapsed.

  On the other hand, in the signal reception process, the communication device shifts to a reception standby state when the process is completed and there is no need to transmit a reply packet, and when the process is completed and a reply packet needs to be transmitted. Shifts to reply packet transmission processing. Then, when the processing is completed in the reply packet transmission processing, the communication device shifts to a reception standby state. Hereinafter, the data packet transmission process, the reply packet reception process for the data of the terminal itself, the signal reception process, and the reply packet transmission process will be described.

  When there is no reception signal and there is data to be transmitted in the reception standby state, the communication apparatus shifts to a data packet transmission process and executes the next process.

  FIG. 4 is a flowchart showing the processing routine of “data packet transmission processing”. In step S1, the transmission timing control unit 18 determines whether or not a transmission timing prohibition period is set over the entire period of the current transmission target basic period. More specifically, in step S1, the transmission timing control unit 18 determines whether or not there is a time zone with a level of 0 within the time until the beginning of the next basic period. If there is a time zone with a level of 0, it can be determined that no transmission timing prohibition period is set for that time zone, and it can be determined that a transmission timing period is set for a time zone where the level is not 0.

  If it is determined in step S1 that the transmission timing prohibition period is set over the entire period of the basic cycle to be transmitted (affirmative determination), the process proceeds to step S2.

  In step S2, the transmission timing control unit 18 waits until the slot period in which the lowest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period of the basic cycle to be transmitted. Then, the process proceeds to step S3.

  On the other hand, if it is determined in step S2 that the transmission timing prohibition period is not set over the entire period of the basic cycle to be transmitted (determination is negative), the process proceeds to step S3.

  In step S3, the transmission timing control unit 18 measures the reception sensitivity of each slot based on the detection result of the packet detection unit 13, and determines whether or not a carrier has been detected. If it is determined in step S3 that a carrier has been detected, the state shifts to the reception standby state while the “data to be transmitted” state remains. On the other hand, if it is determined in step S3 that no carrier is detected, the process proceeds to step S4.

  In step S4, the transmission timing control unit 18 controls the transmission circuit 19 to transmit the data packet generated by the packet generation unit 16, and ends this routine. As a result, the data packet is transmitted to each terminal via the antenna 20 at the timing of the slot period in which the transmission timing prohibition period of the lowest level among the transmission timing prohibition periods set over the entire period of the basic period to be transmitted is set. Sent. And it transfers to the reply packet reception process with respect to the data of the own terminal.

  In the case of carrier detection (determination in step S3), “there is data to be transmitted”, but it goes back and forth between “reception standby state” and “data packet transmission processing”. In this case, when it is time to transmit the next data packet, processing for discarding the previous data to be transmitted and transmitting new data is performed.

  FIG. 5 is a flowchart showing a processing routine of “reply packet reception processing for data of own terminal”. In step S11, the transmission timing control unit 18 waits for reception of a reply packet until the next slot, and proceeds to step S12 when the timing of the next slot comes.

  In step S12, the packet detection unit 13 determines whether or not a reply packet is received in the slot in which the terminal transmits the data packet. If it is determined in step S12 that the terminal has received a return packet in the slot that transmitted the data packet (affirmative determination), the process proceeds to step S13. On the other hand, if it is determined in step S12 that the terminal does not receive a reply packet in the slot that transmitted the data packet (determination is negative), the process proceeds to step S15. If it is determined in step S12 that the own terminal has received a reply packet in the slot that transmitted the data packet (affirmative determination), it is determined that the reply packet is a reply to the data packet of the own terminal. Can do.

  Here, when a reply packet is received in a slot in which the terminal transmits a data packet, the reply packet is regarded as a reply (ACK) from another terminal to the terminal. However, when a reply packet is received in a slot different from the slot from which the terminal transmits the data packet, the reply packet indicates that a hidden terminal exists. That is, it can be seen that the hidden terminal occupies the slot for the reception timing of the reply packet.

  In step S13, the packet detector 13 determines whether a reply packet has been received within the ACK period. If it is determined in step S13 that a reply packet has been received within the ACK period (positive determination), the process proceeds to step S14. On the other hand, if it is determined in step S13 that a reply packet has not been received within the ACK period (negative determination), the process proceeds to step S15. In the case of negative determination, the reply packet is received in the collision detection period. This indicates that the data packets of the own terminal and the hidden terminal collide.

  In step S14, the transmission prohibition period setting unit 15 sets the first level transmission prohibition period so as to reserve the transmission timing of the next data packet so that the transmission of the data packet is in the same slot as the previous one. .

  FIG. 6 is a timing chart for explaining the transmission prohibition period. Here, after the terminal transmits a data packet, all peripheral terminals transmit a reply packet to the data packet.

  At this time, when the transmission prohibition period setting unit 15 receives a reply packet for the data packet of its own terminal from all peripheral terminals, the data packet of its own terminal is transmitted so that it can be transmitted in the same slot as the transmission of the data packet in the next frame. 100 msec after the transmission timing of the terminal is determined as the next scheduled transmission timing of the own terminal, the period from the current timing to the next scheduled transmission timing is set as the first level transmission prohibition period, and this routine ends. To do. As a result, the next scheduled transmission timing of the terminal is reserved. Then, the state shifts to a reception standby state.

  In step S15, the transmission prohibition period setting unit 15 sets the first level transmission prohibition period in the same slot as the transmission of the data packet in the next frame, and ends this routine. Thereby, the transmission timing of the data packet of the next terminal next time is changed, and the collision of the data packet can be avoided. Then, the state shifts to a reception standby state.

  Further, when the communication apparatus detects a reception signal in the “reception standby state”, the communication apparatus shifts to “signal reception process” and executes the next process.

  FIG. 7 is a flowchart showing a processing routine of “signal reception processing”. In step S21, the receiving circuit 12 shown in FIG. 1 receives a packet of another terminal (peripheral terminal), the packet detection unit 13 detects the packet, and the process proceeds to step S22.

  In step S22, the transmission prohibition period setting unit 15 determines the type (data packet or reply packet) of the packet detected by the packet detection unit 13. If the packet is a data packet, the process proceeds to step S23. Advances to step S24. If it is determined in step S22 that the packet type is a reply packet, it can be determined that the reply packet is not a reply to the data packet of the terminal itself.

  In step S23, the transmission prohibition period setting unit 15 waits for a predetermined period, ends this routine, and proceeds to a reply packet transmission process.

  In step S24, the packet detection unit 13 determines whether a reply packet has been received within the ACK period. If it is determined in step S24 that a reply packet has been received within the ACK period (positive determination), the process proceeds to step S25. On the other hand, if it is determined in step S24 that a return packet has not been received within the ACK period (negative determination), the process proceeds to step S26.

  In step S25, since a reply packet that is not for the data packet of the terminal itself is detected, it can be seen that the hidden terminal uses the current slot. Therefore, the transmission prohibition period setting unit 15 calculates a value that is lower than the value of the first level and increases as the received power of the received reply packet increases, and the calculated value is set to the first value. The second level transmission prohibition period is set in the same slot as the slot that received the return packet in step S21 in the next frame. That is, the transmission prohibition period setting unit 15 sets a slot (slot period) in which the hidden terminal may transmit the next data packet as the second level transmission prohibition period based on the detection timing of the return packet. To do. Then, after setting the transmission prohibition period of the second level, this routine is ended and the process shifts to the reception standby state. Thereby, the collision of the data packet with the hidden terminal can be avoided.

  In step S26, the reply packet received in step S21 indicates that a packet collision has occurred between other terminals. In this case, each other terminal may change the transmission timing of the data packet. Therefore, considering that the other terminal changes the transmission timing, the transmission prohibition period setting unit 15 cancels the transmission prohibition period for the same slot as the slot that received the reply packet in step S21 in the next frame ( Alternatively, the level of the transmission prohibition period is lowered by a predetermined value), and this routine is terminated. Then, the state shifts to a reception standby state.

  FIG. 8 is a flowchart showing the processing routine of “reply packet transmission processing”. In step S31, the packet detection unit 13 determines whether or not the data packet transmitted from the other terminal has been successfully received. If it is determined in step S31 that the data packet transmitted from another terminal has been successfully received (positive determination), the process proceeds to step S32. On the other hand, if it is determined in step S31 that the data packet transmitted from another terminal has not been successfully received (determination is negative), the process proceeds to step S34.

  Here, for example, when one packet of data is detected at a predetermined timing by the packet detector 13, it is considered that the data packet has been successfully received. In addition, if data other than one packet (for example, data that could not be demodulated even though there are two or more packets or a certain amount of received power) is detected, it is considered that the data packet was not successfully received. .

In step S32, the transmission timing control unit 18 controls the transmission circuit 19 to transmit a reply packet after the T _{rep ACK} time has elapsed (packet detection period) from the reception timing of the data packet, and proceeds to step S33.

  In step S33, the transmission prohibition period setting unit 15 sets the first level transmission prohibition period in the same slot as the slot that received the data packet in step S31 in the next frame, and ends this routine. Thereby, it is possible to prevent the own terminal from transmitting at the scheduled transmission timing of the next data packet of the other terminal. Then, this routine is finished, and a transition is made to a reception standby state.

On the other hand, in step S34, the transmission timing control unit 18 controls the transmission circuit 19 to transmit a reply packet after the T _{rep ACK} time has elapsed (collision detection period) from the reception timing of the data packet, and proceeds to step S35. .

  In step S35, the transmission prohibition period setting unit 15 cancels the transmission prohibition period for the same slot as the slot that received the data packet in step S31 in the next frame, and ends this routine. Then, the state shifts to a reception standby state.

  As described above, the communication apparatus according to the present embodiment receives a data packet and a reply packet transmitted from another terminal, detects the data packet and the reply packet, and detects the data packet and the reply packet. A receiving circuit 12 and a packet detector 13 for detecting the received power of the packet are provided.

  In addition, the communication device according to the present embodiment includes a packet demodulator 14 that transmits a reply packet after a period according to the detection result of the data packet when the data packet is detected by the packet detector 13. A generation unit 17, a transmission timing control unit 18, and a transmission circuit 19 are provided. The packet demodulator 14, the reply packet generator 17, the transmission timing controller 18, and the transmission circuit 19 constitute all or part of the reply packet transmitter of the present invention.

  Further, when the reply packet is received by the receiving circuit 12, the communication device according to the present embodiment receives the reply received when the reply packet received by the receiving circuit 12 is a reply to the data packet of the terminal itself. The transmission timing of the data packet of the terminal is determined based on the reception timing of the packet, and a slot period not including the determined transmission timing is set as a predetermined first-level transmission timing prohibition period and received. When the reply packet received by the circuit 12 is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet and does not include the decided transmission timing. The slot period is lower than the first level and received And a transmission prohibited period setting section 15 for setting a transmission timing prohibited period of the second level defined to be higher the larger the magnitude of the received power of the reply packet.

  Furthermore, the communication apparatus according to the present embodiment, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, The packet generation unit 16, the transmission timing control unit 18, and the transmission circuit that transmit the data packet at the timing of the slot period in which the lowest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period 19 is provided. The packet generation unit 16, the transmission timing control unit 18, and the transmission circuit 19 constitute all or part of the transmission means of the present invention.

  When the reply packet is received and the received reply packet is a reply to the data packet of the own terminal, the communication device according to the present embodiment receives the data of the own terminal based on the reception timing of the received reply packet. The transmission timing of the packet is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means When it is not a reply to the data packet, the transmission timing of the data packet of the terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is lower than the first level and received. The higher the received power of received reply packets, the higher It is set as the transmission timing prohibited period of the second level defined as. When the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured including a plurality of slot periods, the transmission timing prohibition period set over the entire period of the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set.

  As described above, according to the communication apparatus of the present embodiment, when the received reply packet is not a reply to the data packet of the own terminal, the reply that is lower than the first level and received during the slot period not including the transmission timing. A second-level transmission timing prohibition period is set so as to increase as the received power of the packet increases. And according to the communication apparatus of this embodiment, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the lowest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period.

  Here, the closer the position of the other terminal that transmitted the reply packet is to the position of the own terminal, the greater the received power of the reply packet. Also, the greater the number of other terminals that have transmitted the reply packet, the greater the received power of the reply packet. Therefore, when the received reply packet is not a reply to the data packet of the own terminal, the closer the position of the other terminal that transmitted the reply packet is to the position of the own terminal, and the greater the number of other terminals that transmitted the reply packet. The value of the second level of the set transmission timing prohibition period becomes high, and the degree of prohibition of data packet transmission by the own terminal in the transmission timing prohibition period (the terminal transmits the data packet in the transmission timing prohibition period) The degree of prohibition of doing) increases. That is, in the present invention, the closer the position of the other terminal that has transmitted the reply packet is to the position of the own terminal, and the greater the number of other terminals that have transmitted the reply packet, the more the transmission timing prohibition period is set in the slot period set. The degree of prohibition of data packet transmission by the terminal increases.

  And according to the communication apparatus of this embodiment, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the transmission timing prohibition period at the lowest level is set among the transmission timing prohibition periods set over the entire period (that is, at the timing of the slot period with the lowest prohibition degree). . Even if a data packet is transmitted in a transmission timing prohibition period determined based on a reply packet with low received power, the effect of packet collision is less, and the effect of packet collision occurs only at a distant terminal. Because.

  Therefore, according to the communication apparatus of the present embodiment, it is possible to guarantee a data packet transmission opportunity and transmit the data packet at a more preferable timing.

  In the above, when the second level is determined to be lower and lower than the first level and higher as the received power of the received reply packet is larger (the second level value is the reply packet). However, the present invention is not limited to this. For example, the second level may be a fixed value lower than the first level. For example, when the value of the first level is 100, the value of the second level may be 50.

  Further, when the reply packet is received by the receiving circuit 12 and the reply packet received by the receiving circuit 12 is a reply to the data packet of the own terminal, the transmission prohibition period setting unit 15 The transmission timing of the data packet of the terminal is determined based on the reception timing, and the slot period that does not include the determined transmission timing is defined as a transmission timing prohibition period of a predetermined first level (for example, a level of 1). When the reply packet received by the receiving circuit 12 is not a reply to the data packet of the own terminal, the lower the value is, the higher the value of the first level and the larger the received power of the received reply packet. Is calculated as a second level and received as a second level. The transmission timing of the data packet of the terminal may be determined based on the reception timing of the reception packet, and the slot period not including the determined transmission timing may be set as the second level transmission timing prohibition period, In addition, each unit and circuit constituting the transmission means such as the packet generation unit 16, the transmission timing control unit 18, and the transmission circuit 19 transmits the transmission timing over the entire period of the basic cycle of the transmission target including a plurality of slot periods. When the prohibition period is set, the data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period of the basic period to be transmitted. You may make it transmit.

  In such a case, when the received reply packet is not a reply to the data packet of its own terminal, the received power of the received reply packet is higher than the first level during the slot period not including the transmission timing. A second level transmission timing prohibition period is set so as to decrease as the value increases. When the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured including a plurality of slot periods, the transmission timing prohibition period set over the entire period of the basic period of the transmission target The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set.

  Here, when the received reply packet is not a reply to the data packet of the own terminal, the closer the position of the other terminal that transmitted the reply packet is to the position of the own terminal, the more the number of other terminals that transmitted the reply packet. As a result, the value of the second level of the set transmission timing prohibition period becomes lower, and the transmission tolerance of the data packet by the own terminal in the transmission timing prohibition period (in the transmission timing prohibition period, the terminal transmits the data packet The degree to which transmission is permitted) is reduced. That is, in this case, the closer the position of the other terminal that transmitted the reply packet is to the position of the own terminal, and the greater the number of other terminals that transmitted the reply packet, the more the slot period in which the transmission timing prohibition period is set. The permissible degree of transmission of data packets by the own terminal becomes low.

  In such a case, when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured including a plurality of slot periods, it is set over the entire period of the basic period of the transmission target. The data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set (that is, at the timing of the slot period having the highest tolerance). Even if a data packet is transmitted in a transmission timing prohibition period determined based on a reply packet with low received power, the effect of packet collision is less, and the effect of packet collision occurs only at a distant terminal. Because.

  Therefore, even in such a case, it is possible to guarantee the transmission opportunity of the data packet and transmit the data packet at a more preferable timing. In such a case, for example, the second level may be a fixed value higher than the first level. For example, when the value of the first level is 1, the value of the second level may be 100.

  In each of the above cases, the reception circuit 12, the packet detection unit 13, the packet demodulation unit 14, the transmission prohibition period setting unit 15, the packet generation unit 16, the reply packet generation unit 17, the transmission timing control unit 18, the transmission circuit 19, The control circuit 30 may be realized by a program stored in a ROM of a computer configured with a CPU (Central Processing Unit), a ROM (Rean Only Memory), a RAM (Random Access Memory), and the like. As such a program, for example, when a computer receives a data packet and a reply packet transmitted from another terminal and detects a data packet and a reply packet, when the data packet is detected by the receiving means, A reply packet transmitting means for sending a reply packet after a period according to the detection result of the data packet, and when the reply packet is received by the receiving means, the reply packet received by the receiving means is a reply to the data packet of the own terminal Is determined, the transmission timing of the data packet of the terminal itself is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is set to a predetermined first level transmission timing. It is set as a prohibited period and received by the receiving means. When the received reply packet is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is determined. The setting means for setting as a second level transmission timing prohibition period lower than the first level, and the transmission timing prohibition period are set over the entire period of the basic cycle to be transmitted that includes a plurality of slot periods. In this case, it functions as a transmission means for transmitting a data packet at the timing of the slot period in which the transmission timing prohibition period of the lowest level is set among the transmission timing prohibition periods set over the entire period of the basic period to be transmitted. A program to do this is conceivable.

  As another example, the computer receives a data packet and a reply packet transmitted from another terminal, detects the data packet and the reply packet, and also receives the data packet and the reply packet. When a packet is detected by the receiving means, after a period corresponding to the detection result of the data packet, a reply packet transmitting means for sending a reply packet, and when the reply packet is received by the receiving means, it is received by the receiving means. When the received reply packet is a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is determined. Predetermined first level transmission timing prohibition period When the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, Setting for setting the slot period not including the transmission timing as a second level transmission timing prohibition period that is set to be higher as the received power of the received reply packet is larger than the first level. And a transmission timing prohibition period that is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, and a transmission timing that is set over the entire period of the basic period of the transmission target The lowest transmission timing prohibition period is set in the prohibition period. At the timing of the slot period, program for functioning as a transmitting means for transmitting data packets is conceivable.

  As another example, the computer receives a data packet and a reply packet transmitted from another terminal, receives a data packet and a reply packet, and receives data when the data packet is detected by the receiving means. After a period according to the packet detection result, a reply packet sending means for sending a reply packet, and when the reply packet is received by the receiving means, the reply packet received by the receiving means is a reply to the data packet of its own terminal. In some cases, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and a slot period not including the determined transmission timing is prohibited from a predetermined first level transmission timing. The reply packet received by the receiving means as well as the period Is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is set to the first period A setting means for setting a transmission timing prohibition period of a second level higher than the level, and when a transmission timing prohibition period is set over the entire period of the transmission target basic cycle including a plurality of slot periods , For functioning as a transmission means for transmitting a data packet at the timing of the slot period in which the highest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period of the basic cycle to be transmitted A program is conceivable.

  Furthermore, as another example, the computer receives a data packet and a reply packet transmitted from another terminal, detects the data packet and the reply packet, and also receives the data packet and the reply packet. When a packet is detected by the receiving means, after a period corresponding to the detection result of the data packet, a reply packet transmitting means for sending a reply packet, and when the reply packet is received by the receiving means, it is received by the receiving means. When the received reply packet is a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is determined. Predetermined first level transmission timing prohibition period When the reply packet received by the receiving means is not a reply to the data packet of the own terminal, the transmission timing of the data packet of the own terminal is determined based on the reception timing of the received reply packet, Setting for setting the slot period not including the transmission timing as a second level transmission timing prohibition period that is set to be lower as the received power of the received reply packet is higher than the first level And a transmission timing prohibition period that is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, and a transmission timing that is set over the entire period of the basic period of the transmission target The highest level transmission timing prohibition period is set. At the timing of the slot period, program for functioning as a transmitting means for transmitting data packets is conceivable.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can also be applied to a design modified within the scope of the claims.

12 reception circuit 13 packet detection unit 14 packet demodulation unit 15 transmission prohibition period setting unit 16 packet generation unit 17 reply packet generation unit 18 transmission timing control unit 19 transmission circuit

Claims (8)

Receiving means for receiving a data packet and a reply packet transmitted from another terminal, and detecting the data packet and the reply packet;
When the data packet is detected by the receiving means, a reply packet transmitting means for transmitting the reply packet after a period according to the detection result of the data packet;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is If it is not a reply to the data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is lower than the first level. Second level transmission timing prohibition period And setting means for setting,
When the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured including a plurality of slot periods, the transmission timing prohibition period set over the entire period of the basic period of the transmission target Transmitting means for transmitting a data packet at the timing of the slot period in which the lowest level transmission timing prohibition period is set,
A communication device comprising: Receiving means for receiving a data packet and a reply packet transmitted from another terminal, detecting the data packet and the reply packet, and detecting reception power of the data packet and the reply packet;
When the data packet is detected by the receiving means, a reply packet transmitting means for transmitting the reply packet after a period according to the detection result of the data packet;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is If it is not a reply to this data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is lower than the first level. And the received power of the received reply packet is large. Setting means for setting a transmission timing prohibited period of the second level defined such that the higher the larger is,
When the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured including a plurality of slot periods, the transmission timing prohibition period set over the entire period of the basic period of the transmission target Transmitting means for transmitting a data packet at the timing of the slot period in which the lowest level transmission timing prohibition period is set,
A communication device comprising: Receiving means for receiving a data packet and a reply packet transmitted from another terminal, and detecting the data packet and the reply packet;
When the data packet is detected by the receiving means, a reply packet transmitting means for transmitting the reply packet after a period according to the detection result of the data packet;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is When it is not a reply to the data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is higher than the first level. Second level transmission timing prohibition period And setting means for setting,
When the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured including a plurality of slot periods, the transmission timing prohibition period set over the entire period of the basic period of the transmission target Transmitting means for transmitting a data packet at the timing of the slot period in which the highest level transmission timing prohibition period is set,
A communication device comprising: Receiving means for receiving a data packet and a reply packet transmitted from another terminal, detecting the data packet and the reply packet, and detecting reception power of the data packet and the reply packet;
When the data packet is detected by the receiving means, a reply packet transmitting means for transmitting the reply packet after a period according to the detection result of the data packet;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is If it is not a reply to this data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is set higher than the first level. And the received power of the received reply packet is large. Setting means for setting a transmission timing prohibited period of the second level which is determined so becomes larger lower of,
When the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured including a plurality of slot periods, the transmission timing prohibition period set over the entire period of the basic period of the transmission target Transmitting means for transmitting a data packet at the timing of the slot period in which the highest level transmission timing prohibition period is set,
A communication device comprising: Computer
Receiving means for receiving a data packet and a reply packet transmitted from another terminal, and detecting the data packet and the reply packet;
A reply packet sending means for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is If it is not a reply to the data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is lower than the first level. Second level transmission timing prohibition period Setting means for setting, and when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the setting is made over the entire period of the basic period of the transmission target A program for functioning as a transmission means for transmitting a data packet at the timing of the slot period in which the transmission timing prohibition period of the lowest level is set among the transmission timing prohibition periods set. Computer
Receiving means for receiving a data packet and a reply packet transmitted from another terminal, detecting the data packet and the reply packet, and detecting received power of the data packet and the reply packet;
A reply packet sending means for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is If it is not a reply to this data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is lower than the first level. And the received power of the received reply packet is large. Setting means for setting as a second level transmission timing prohibition period that is set so as to increase as the value increases, and the transmission timing prohibition over the entire period of the basic period of the transmission target including a plurality of slot periods When the period is set, the data packet is transmitted at the timing of the slot period in which the transmission timing prohibition period of the lowest level is set among the transmission timing prohibition periods set over the entire period of the basic period to be transmitted. A program for functioning as a transmission means for transmission. Computer
Receiving means for receiving a data packet and a reply packet transmitted from another terminal, and detecting the data packet and the reply packet;
A reply packet sending means for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is When it is not a reply to the data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is higher than the first level. Second level transmission timing prohibition period Setting means for setting, and when the transmission timing prohibition period is set over the entire period of the basic period of the transmission target configured to include a plurality of slot periods, the setting is made over the entire period of the basic period of the transmission target A program for functioning as a transmission means for transmitting a data packet at the timing of the slot period in which the highest level transmission timing prohibition period is set among the transmission timing prohibition periods set. Computer
Receiving means for receiving a data packet and a reply packet transmitted from another terminal, detecting the data packet and the reply packet, and detecting received power of the data packet and the reply packet;
A reply packet sending means for sending the reply packet after a period according to the detection result of the data packet when the data packet is detected by the receiving means;
When the reply packet is received by the receiving means and the reply packet received by the receiving means is a reply to the data packet of the own terminal, the data of the own terminal is based on the reception timing of the received reply packet. The packet transmission timing is determined, a slot period not including the determined transmission timing is set as a predetermined first level transmission timing prohibition period, and the reply packet received by the receiving means is If it is not a reply to this data packet, the transmission timing of the data packet of its own terminal is determined based on the reception timing of the received reply packet, and the slot period not including the determined transmission timing is set higher than the first level. And the received power of the received reply packet is large. Setting means for setting as a second level transmission timing prohibition period that is set to be lower as the value is larger, and the transmission timing prohibition over the entire period of the basic period of the transmission target including a plurality of slot periods When the period is set, the data packet is transmitted at the timing of the slot period in which the highest level transmission timing prohibition period is set among the transmission timing prohibition periods set over the entire period of the basic period to be transmitted. A program for functioning as a transmission means for transmission.

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