JP2012199841A - Radio communications system, relay device and program for relay device, radio terminal and program for radio terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communications system etc. enabling radio communications between radio terminals without using routing information stored in a radio terminal.SOLUTION: In a radio communication system, when a transmitting source terminal S performs a transmission operation P1a of a wireless transmission packet, a relay terminal R performs a reception operation P1b of the wireless transmission packet. After a prescribed time period passes to perform a reception operation P2 of a wireless reply packet, the relay terminal R performs a transmission operation P3a of a substitution packet. The transmitting source terminal S and a destination terminal D perform reception operations P3b and P3c of the substitution packet. The transmitting source terminal S replaces a transmitting source of replied packet with a terminal identifier of the relay terminal R. The destination terminal D performs a transmission operation P4a of a reply packet corresponding to the substitution packet, and the relay terminal R performs a reception operation P4b. The relay terminal R generates a substitution reply packet using own terminal identifier as a transmitting source, and performs a transmission operation P5a. The transmitting terminal S performs a reception operation P5b of substitution reply packet to get a reply packet of the wireless transmission packet.

Description

  The present invention relates to a radio communication system that performs radio communication between radio terminals, a relay device, a program for the relay device, a radio terminal, and a program for the radio terminal.

  2. Description of the Related Art Conventionally, as a wireless communication system that performs wireless communication between wireless terminals, one described in Patent Document 1 below is known.

  The wireless communication system described in Patent Document 1 includes a wireless access point and a wireless client. When the wireless client is not performing wireless communication, it monitors the wireless packet of the SSID (Service Set Identifier) used by the wireless client and relays the wireless packet between the wireless client and the wireless access point with poor wireless communication status .

JP 2006-165623 A

  However, in the wireless communication system such as Patent Document 1 described above, a wireless terminal may move, and therefore a certain communication path cannot be specified. In addition, in a wireless communication system, a wireless terminal that can communicate at a certain point in time may become unable to communicate due to movement of the wireless terminal.

  Under such circumstances, the conventional wireless communication system requires a memory capacity for holding route information for communicating with the communication partner by the wireless terminal.

  In addition, the technique described in Patent Document 1 measures the reception intensity of radio waves from an access point (destination terminal) and determines whether to relay, and receives the number of destination terminals as many as the number of destination terminals. Remember strength. Therefore, this technique requires processing for measuring the radio wave condition between the relay terminal and the destination terminal, and a memory capacity therefor.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and a wireless communication system and a relay device that enable wireless communication between wireless terminals without using route information stored in the wireless terminals It is another object of the present invention to provide a relay device program, a wireless terminal, and a wireless terminal program.

  A wireless communication system according to a first invention for solving the above-described problem is a wireless communication system including a plurality of wireless terminals and at least one relay device, wherein the relay device is connected to the second wireless device from the first wireless terminal. Communication detecting means for detecting that a packet has been sent to the terminal; and from the second wireless terminal within a predetermined time after the packet is sent from the first wireless terminal to the second wireless terminal by the communication detecting means. When there is no reply, proxy packet generation means for generating a proxy packet with the sender identifier as its own identifier and information indicating that the packet is generated on its behalf, and a reply from the second wireless terminal Is changed, the transmission source identifier of the reply packet from the second wireless terminal is changed to its own identifier, and the transmission destination identifier of the reply packet is changed to the identifier of the first wireless terminal. A proxy reply packet generating means for generating a further proxy reply packet; and a communication means for sending the proxy packet and the proxy reply packet. The first wireless terminal transmits the proxy packet by the relay device. A communication detection means for detecting the event, and when the communication detection means detects that the proxy packet is transmitted, an identifier expected as a return source of the transmitted packet is determined from the identifier of the second wireless terminal. Reply source changing means for changing to an identifier of the relay device.

  The wireless communication system according to a first aspect of the present invention is the wireless communication system according to the second aspect, wherein the relay device is incapable of wireless communication with the second wireless terminal as a result of sending the proxy packet from the communication means. In the case where the second wireless terminal is a non-communication terminal, further comprising a non-communication terminal storage unit, wherein the proxy packet generation unit is stored in the non-communication terminal storage unit The proxy packet addressed to two wireless terminals is not generated.

  The wireless communication system according to a second aspect of the present invention is the wireless communication system according to the third aspect, wherein the relay device periodically deletes the information of the communication disabled terminal stored in the communication disabled terminal storage unit. .

  A relay device according to a fourth invention for solving the above-described problem is a relay device capable of wireless communication with a plurality of wireless terminals, and detects that a packet is transmitted from the first wireless terminal to the second wireless terminal. A communication detection unit, and a self-transmission identifier when the packet is not returned from the second wireless terminal within a predetermined time after the packet is transmitted from the first wireless terminal to the second wireless terminal by the communication detection unit. A proxy packet generating means for generating a proxy packet to which information indicating that the packet is generated on behalf of itself is added, and when there is a reply from the second wireless terminal, the second wireless terminal Proxy reply packet for generating a proxy reply packet in which the source identifier of the reply packet from the mobile station is changed to its own identifier and the destination identifier of the reply packet is changed to the identifier of the first wireless terminal And forming means, characterized in that it comprises communication means for sending the proxy packet and said proxy reply packet.

  A relay device program according to a fifth aspect of the present invention for solving the above-described problem is a relay device program capable of wireless communication with a plurality of wireless terminals, wherein the relay device computer is connected from the first wireless terminal to the second wireless device. Communication detecting means for detecting that a packet has been sent to the terminal; and from the second wireless terminal within a predetermined time after the packet is sent from the first wireless terminal to the second wireless terminal by the communication detecting means. When there is no reply, proxy packet generation means for generating a proxy packet with the sender identifier as its own identifier and information indicating that the packet is generated on its behalf, and a reply from the second wireless terminal Is changed, the transmission source identifier of the reply packet from the second wireless terminal is changed to its own identifier, and the transmission destination identifier of the reply packet is changed to the identification of the first wireless terminal. Wherein the proxy reply packet generating means for generating a proxy reply packet has been changed, that to function as a communication means for sending the proxy packet and the proxy reply packet.

  A wireless terminal according to a sixth invention for solving the above-mentioned problems is a wireless terminal capable of wireless communication with at least one relay device, wherein communication means capable of transmitting / receiving a packet to / from the relay device, and the communication Communication for detecting that a proxy packet to which a transmission source identifier is a self-identifier and added information indicating that the packet is a proxy generated by the relay device is transmitted after the wireless transmission packet is transmitted by the means When it is detected by the detection means and the communication detection means that the proxy packet has been transmitted, an identifier expected as a return source of the transmitted packet is determined from the identifier of the second wireless terminal to the identifier of the relay device. And a reply source changing means for changing to.

  A program for a wireless terminal according to a seventh invention for solving the above-described problem is a program for a wireless terminal capable of wireless communication with at least one relay device, wherein the computer of the wireless terminal is connected to the relay device. A communication means capable of sending and receiving a packet; and after transmitting a wireless transmission packet by the communication means, a proxy packet to which a source identifier is set as its own identifier and information indicating that the packet is generated on its behalf is added A communication detecting means for detecting that the relay packet has been sent, and an identifier that is expected as a return source of the transmitted packet when the communication detecting means has detected that the proxy packet has been sent. (2) It is made to function as a reply source changing means for changing from the identifier of the wireless terminal to the identifier of the relay device.

  According to the present invention, the relay device transmits a proxy packet with the source identifier as its own identifier and added with information indicating that it is a packet generated by the proxy itself, so that the route information stored in the wireless terminal Wireless communication can be performed between wireless terminals without using a network or the like.

It is a figure which shows the structural example of the radio | wireless communications system shown as 1st Embodiment of this invention. It is a block diagram which shows the structure of the transmission origin radio | wireless terminal 10 in the radio | wireless communications system shown as 1st Embodiment of this invention. It is a block diagram which shows the structure of the relay radio | wireless terminal in the radio | wireless communications system shown as 1st Embodiment of this invention. In the wireless communication system shown as the first embodiment of the present invention, an operation in a state where communication between wireless terminals is communicable is shown, (a) is an arrangement example of wireless terminals, and (b) is an operation of a transmission source terminal. It is a sequence diagram, (c) is a sequence diagram showing the operation of the destination terminal. In the radio | wireless communications system shown as 1st Embodiment of this invention, the operation | movement in the state which cannot communicate between radio | wireless terminals is shown, (a) is an example of arrangement | positioning of a radio | wireless terminal and a relay terminal, (b) is a transmission terminal terminal. FIG. 4 is a sequence diagram showing an operation, (c) is a sequence diagram showing an operation of a relay terminal, and (d) is a sequence diagram showing an operation of a destination terminal. In the radio | wireless communications system shown as 1st Embodiment of this invention, operation | movement when a some relay terminal exists is shown, (a) is an example of arrangement | positioning of a radio | wireless terminal and a relay terminal, (b) is a transmission terminal terminal. It is a sequence diagram which shows operation | movement, (c), (d) is a sequence diagram which shows operation | movement of a relay terminal, (e) is a sequence diagram which shows operation | movement of a destination terminal. The radio | wireless communications system shown as 2nd Embodiment of this invention shows operation | movement when two radio terminals and an unrelated terminal are included, (a) is an example of arrangement | positioning of a radio terminal and an unrelated terminal, (b) is a transmission origin. It is a sequence diagram which shows operation | movement of a terminal, (c) is a sequence diagram which shows operation | movement of a destination terminal, (d) is a sequence diagram which shows operation | movement of an unrelated terminal.

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

[First Embodiment]
The wireless communication system shown as the first embodiment of the present invention is configured as shown in FIG. 1, for example. The wireless communication system includes a wireless controller 1 and a plurality of wireless terminals 2a to 2d, 3, 4, and 5.

  The wireless communication system is applied to an energy management system including a wireless sensor that detects temperature, humidity, dust, and presence / absence information installed in a factory, an office, a house, or the like, and a hygiene management system. The wireless communication system is applied to a crime prevention / disaster prevention system including a smoke detection sensor, a window glass destruction sensor, a camera, and the like. Furthermore, this wireless communication system is also applied to a lighting control system including a lighting switch, a dimming device, a lighting device, and the like.

  The wireless communication system in the present embodiment includes a wireless controller 1, a window sensor 2a, a smoke sensor 2b, a human sensor 2c, a power sensor 2d, a lighting remote controller 3, a lighting fixture 4, and a buzzer 5 as wireless terminals.

  The wireless controller 1 and the wireless terminal can perform wireless communication by operating according to a predetermined wireless communication protocol. When performing wireless communication, the wireless controller 1 can communicate with wireless terminals that exist within a predetermined wireless communication range by operating an internal wireless communication I / F. Further, when performing wireless communication, the wireless terminal can communicate with the wireless controller 1 or another wireless terminal existing within a predetermined wireless communication range by operating an internal wireless communication I / F.

  In this wireless communication system, a window sensor 2a, a smoke sensor 2b, a human sensor 2c, a power sensor 2d, and a lighting fixture 4 are arranged so as to be able to communicate with the wireless controller 1 wirelessly. The lighting remote controller 3 can communicate with the lighting fixture 4 through the power sensor 2d. The buzzer 5 can communicate with the wireless controller 1 via the human sensor 2c.

  In this wireless communication system, for example, when the lighting remote controller 3 is operated by a user, the lighting remote controller 3 and the lighting fixture 4 perform wireless communication via the power sensor 2d to turn on or off the lighting fixture 4. The power sensor 2 d that measures the amount of power used in an arbitrary system supplies the measured power information to the wireless controller 1. The wireless controller 1 can perform monitoring and control based on the amount of power used in an arbitrary system based on the power information. Thereby, the wireless communication system functions as an illumination control system.

  In addition, the wireless communication system is set so that the wireless controller 1 is in a warning state by wireless communication with respect to the window sensor 2a. In this state, when an intrusion alarm indicating that the window has been opened from the window sensor 2a is wirelessly communicated from the window sensor 2a to the wireless controller 1, the wireless controller 1 uses the buzzer 5 by wireless communication via the human sensor 2c. To activate the alarm. In the wireless communication system, the wireless controller 1 sets the human sensor 2c to be in a warning state by wireless communication. When the human sensor 2c detects the presence of a person, the wireless controller 1 detects the human sensor 2c. The buzzer 5 is operated via Thereby, the wireless communication system functions as a crime prevention system.

  Furthermore, in this wireless communication system, when smoke detection information is supplied from the smoke sensor 2b to the wireless controller 1 by wireless communication, the wireless controller 1 causes the buzzer 5 to perform an alarm operation by wireless communication via the human sensor 2c. Thereby, a radio | wireless communications system functions as a disaster prevention system.

  Next, the internal configuration of the wireless controller and the wireless terminal in the wireless communication system described above will be described with reference to FIGS. In this description, the source wireless controller 1 and the wireless terminals 2a to 2d, 3, 4, and 5 that transmit wireless packets are described as the source wireless terminal 10 (first wireless terminal) in FIG. The wireless controller 1 and the wireless terminals 2a to 2d, 3, 4, and 5 that relay wireless packets will be described as the relay wireless terminal 20 in FIG.

  Of course, the wireless controller 1 and the wireless terminals 2a to 2d, 3, 4, and 5 may have both the function of the transmission source wireless terminal 10 and the function of the relay wireless terminal 20 described below. Further, wireless terminals that do not have the functions of a transmission source wireless terminal 10 and a relay wireless terminal 20 described later may be included in the wireless communication system. This wireless terminal includes a storage unit, a communication I / F circuit, a CPU, and the like, and can receive, transmit, and relay wireless packets.

  As illustrated in FIG. 2, the transmission source wireless terminal 10 includes a calculation unit 11, a storage unit 12, a transmission unit 13, and a reception unit 14. The calculation unit 11 includes a proxy process detection unit 11a and a reply source change unit 11b. The transmission source wireless terminal 10 is a computer including a storage unit, a communication I / F circuit, a CPU, and a program, and the CPU executes the program. As a result, the program of the transmission source wireless terminal 10 causes the computer of the transmission source wireless terminal 10 to function as a means for detecting a proxy process and receiving a proxy packet, as will be described later.

  The transmission unit 13 and the reception unit 14 include a wireless communication I / F circuit or the like. The receiving unit 14 receives wireless packets transmitted from the wireless controller 1 or the other wireless terminals 2a to 2d, 3, 4, and 5. The transmission unit 13 transmits a wireless packet including its own terminal identifier as a transmission source identifier to the wireless controller 1 or the other wireless terminals 2a to 2d, 3, 4, and 5.

  The storage unit 12 stores transmission information, its own terminal identifier, a communication partner's terminal identifier, and the like. The transmission information is information that is desired to be transmitted from the transmission source wireless terminal 10 to the communication partner wireless terminal. For example, in the case of the illumination remote controller 3, the transmission information is operation information, and in the case of a sensor, the transmission information is a sensor measurement value.

  When transmitting the wireless packet, the calculation unit 11 reads the transmission information, its own terminal identifier, and the communication partner's terminal identifier from the storage unit 12. The computing unit 11 stores its own terminal identifier in the transmission source of the header part, generates a wireless transmission packet including the terminal identifier of the communication partner serving as the destination of the header part, and including transmission information in the data part. The wireless transmission packet is supplied to the transmission unit 13 and transmitted as a radio wave by the transmission unit 13.

  The wireless transmission packet transmitted by the transmission source wireless terminal 10 is directly received by the wireless terminal when the communication partner wireless terminal exists in the wireless communication range of the transmission source wireless terminal 10. Thereafter, the wireless terminal that has received the wireless transmission packet returns a wireless reply packet to the transmission source wireless terminal 10. This wireless reply packet is, for example, ACK.

  The wireless reply packet returned to the transmission source wireless terminal 10 is received by the receiving unit 14. When the transmission source wireless terminal 10 receives the wireless reply packet by the receiving unit 14, the transmission source wireless terminal 10 confirms that the transmission source of the wireless reply packet is the terminal identifier of the communication partner that is the destination of the wireless transmission packet. As a result, the transmission source wireless terminal 10 can exchange information such as sensor signals and control commands with the wireless terminal of the communication partner.

  However, if the communication partner of the transmission source wireless terminal 10 is not in the wireless communication range of the transmission source wireless terminal 10, the wireless transmission packet is relayed by the relay wireless terminal 20 to be described later and the communication partner wireless terminal (the first wireless terminal) 2 wireless terminals). Thereafter, the transmission source wireless terminal 10 receives the packet returned from the relay wireless terminal 20 from the wireless terminal of the communication partner. For this case, the transmission source wireless terminal 10 includes a proxy processing detection unit 11a and a response source change unit 11b in the calculation unit 11.

  The proxy processing detection unit 11a detects that a proxy packet has been transmitted by the relay wireless terminal 20 described later (communication detection means). The relay wireless terminal 20 exists in the wireless communication range of the transmission source wireless terminal 10. For this reason, the transmission source wireless terminal 10 can receive the proxy packet by the reception unit 14 when the relay wireless terminal 20 transmits the proxy packet to the communication partner wireless terminal on behalf of the transmission source wireless terminal 10. At this time, the proxy process detection unit 11a detects information indicating that the transmission source identifier of the received radio packet is the terminal identifier of the relay radio terminal 20 and that the packet is generated on behalf of the relay radio terminal 20. As a result, the transmission source wireless terminal 10 can detect that the wireless transmission packet transmitted earlier is proxyed (relayed) by the relay wireless terminal 20.

  When the proxy processing detection unit 11a detects that the proxy packet is transmitted, the reply source changing unit 11b determines the terminal identifier expected as the reply source of the transmitted wireless transmission packet from the identifier of the wireless terminal of the communication partner. It changes to the identifier of the relay radio terminal 20 (reply source changing means). That is, the reply packet of the previously transmitted wireless transmission packet is not a wireless reply packet that is a wireless identifier of the wireless terminal of the communication partner, but a proxy that stores the terminal identifier of the relay wireless terminal 20 transmitted from the relay wireless terminal 20 Change to reply packet.

  Thereby, even if the wireless transmission packet is relayed by the relay wireless terminal 20 described later, the transmission source wireless terminal 10 can receive the packet returned from the relay wireless terminal 20 by the wireless terminal of the communication partner.

  As illustrated in FIG. 3, the relay radio terminal 20 includes a calculation unit 21, a storage unit 22, a transmission unit 23, and a reception unit 24. The calculation unit 21 includes an other communication detection unit 21a, a proxy packet generation unit 21b, and a proxy reply packet generation unit 21c. The relay wireless terminal 20 is a computer including a storage unit, a communication I / F circuit, a CPU, and a program, and the CPU executes the program. Thereby, the program of the relay radio terminal 20 causes the computer of the relay radio terminal 20 to function as a means for detecting other communication and generating / transmitting a proxy reply packet, as will be described later.

  The transmission unit 23 and the reception unit 24 include a wireless communication I / F circuit or the like. The receiving unit 24 receives a wireless transmission packet transmitted from the transmission source wireless terminal 10. The transmission unit 23 transmits a proxy packet including its own terminal identifier as a transmission source identifier to the wireless terminal of the communication partner. Further, the transmission unit 23 transmits a proxy reply packet including its own terminal identifier as a transmission source identifier to the transmission source wireless terminal 10.

  The storage unit 22 stores its own terminal identifier and the like.

  The other communication detection unit 21 a of the calculation unit 21 acquires the wireless transmission packet transmitted from the transmission source wireless terminal 10 existing in the wireless communication range via the reception unit 24. Thereby, the other communication detection unit 21a detects that the wireless transmission packet is transmitted from the transmission source wireless terminal 10 (first wireless terminal) to the wireless terminal (second wireless terminal) of the communication partner (communication detection unit). .

  The proxy packet generation unit 21b transmits the wireless transmission packet from the communication partner wireless terminal to the transmission source wireless terminal 10 within a predetermined time after the wireless communication packet is transmitted from the transmission source wireless terminal 10 to the communication partner wireless terminal by the other communication detection unit 21a. Monitor for replies. The predetermined time is equal to or longer than a standard time for the wireless terminal of the communication partner receiving the wireless transmission packet to return the wireless reply packet, and it can be determined that the wireless transmission packet is not received by the wireless terminal of the communication partner. It is time and is preset.

  The proxy packet generation unit 21b generates a proxy packet when the wireless reply packet cannot be detected for a predetermined time from the detection of the wireless transmission packet. At this time, the proxy packet generation unit 21b uses the transmission source identifier of the wireless transmission packet as its own (relay wireless terminal 20) identifier, and generates a proxy packet to which information indicating that the packet is a wireless packet generated by itself is added To do. Then, this proxy packet is sent out by the transmission unit 23.

  When the proxy packet is received by the wireless terminal of the communication partner and a wireless reply packet is received from the wireless terminal of the communication partner, the relay wireless terminal 20 generates the proxy reply packet by the proxy reply packet generation unit 21c. At this time, the proxy reply packet generation unit 21c sets the transmission source of the header part as its own terminal identifier, and makes the data part the same as the data part included in the wireless reply packet. The proxy reply packet is sent out by the transmission unit 23.

  A specific operation of the wireless terminal in the wireless communication system configured as described above will be described. For example, when a wireless communication system is introduced in a general house, the required number of hops (the number of relay wireless terminals 20) is 0 or 1 by adopting a wireless system having a wireless communication range of 30 m to 40 m. It becomes. FIG. 4 shows the operation when the number of hops is 0, and FIG. 5 shows the operation when the number of hops is one.

  As shown in FIG. 4A, a transmission source terminal (S: first wireless terminal) as the transmission source wireless terminal 10, and a destination terminal (D: second wireless terminal) corresponding to the wireless terminal of the communication partner However, when they exist in the wireless communication range of each other, communication is possible without the relay wireless terminal 20.

  As shown in FIG. 4B, the destination terminal (D) can perform the wireless transmission packet reception operation P1b in response to the transmission terminal P (S) performing the transmission operation P1a of the wireless transmission packet. . Thereafter, as shown in FIG. 4C, in response to the destination terminal (D) performing the wireless reply packet (ACK) transmission operation P2a, the source terminal (S) receives the wireless reply packet reception operation P2b. It can be performed.

  As shown in FIG. 5A, when the destination terminal (D) and the source terminal (S) cannot communicate directly, the relay radio terminal existing between the destination terminal (D) and the source terminal (S) The relay terminal (R) as 20 relays.

  When the source terminal (S) performs the transmission operation P1a of the wireless transmission packet as shown in FIG. 5B, the relay terminal (R) can perform the reception operation P1b of the wireless transmission packet (FIG. c)). Thereafter, when a predetermined time for performing the wireless reply packet receiving operation P2 has elapsed, the relay terminal (R) performs a proxy packet sending operation P3a (FIG. 5C). In response to this, the source terminal (S) and the destination terminal (D) can perform proxy packet reception operations P3b and P3c (FIGS. 5B and 5D). In response to receiving the proxy packet, the transmission source terminal (S) changes the terminal identifier expected as the transmission source of the returned packet from the terminal identifier of the destination terminal (D) to the terminal identifier of the relay terminal (R). change. When the destination terminal (D) receives the proxy packet and performs the wireless reply packet transmission operation P4a (FIG. 5 (d)), the relay terminal (R) performs the wireless reply packet reception operation P4b. (FIG. 5C). The relay terminal (R) uses the wireless reply packet to generate a proxy reply packet having its own terminal identifier as a transmission source, and performs a sending operation P5a (FIG. 5 (c)). Accordingly, the transmission source terminal (S) can perform the proxy reply packet receiving operation P5b as the reply packet of the wireless transmission packet (FIG. 5B).

As described above, according to this wireless communication system, wireless communication can be performed between wireless terminals without using route information stored in wireless terminals. For example, in general homes, the number of repeats (relays) is usually one in terms of the wireless communication capability of the wireless terminal. Therefore, when the relay terminal (R) has poor communication from the source terminal (S) to the destination terminal (D), the relay terminal (R) performs proxy communication and detects that the relay terminal (R) has been proxyed. The sending source terminal (S) waits for a reply. According to the present embodiment, since it is not necessary to have the routing table itself in either the transmission source terminal (S) or the relay terminal (R), the memory capacity of the wireless terminal can be suppressed and an inexpensive system can be constructed.

  Here, as an existing technology, the reception strength of the radio wave from the access point (destination terminal) is measured to determine whether or not to relay, and the reception strength is stored in the relay terminals for the number of destination terminals. There is something to keep. On the other hand, according to the wireless communication system of the present embodiment, a packet transmitted / received to / from the destination terminal (D) by measuring the reception intensity of the radio wave from the destination terminal (D) by the relay terminal (R). The process of determining whether to relay is no longer necessary. Further, in this wireless communication system, the relay terminal (R) does not need a memory for storing the reception strength with the destination terminal (D). Furthermore, when there are a plurality of destination terminals (D), the reception intensity storage memories corresponding to the number are required, but according to this wireless communication system, there is no need for a memory amount for the reception intensity. Therefore, according to this wireless communication system, an inexpensive system can be constructed.

  In this wireless communication system, there may be a plurality of relay terminals (R1) and relay terminals (R2) as shown in FIG. The relay terminal (R1) and the relay terminal (R2) can wirelessly communicate with both the destination terminal (D) and the transmission source terminal (S).

  In this case, when the transmission operation P1a of the wireless transmission packet is performed by the source terminal (S) (FIG. 6B), the relay terminal (R1) and the relay terminal (R2) receive the wireless transmission packet P1b, P1c is performed (FIGS. 6C and 6D). Thereafter, the source terminal (S) waits for reception of a wireless reply packet (D → S) from the destination terminal (D), but the destination terminal (D) receives the wireless transmission packet from the source terminal (S). For this reason, the wireless reply packet from the destination terminal (D) does not arrive. When a predetermined time for performing the wireless reply packet reception operation P2 has elapsed, the relay terminal (R1) performs a proxy packet (R → D) transmission operation P3a (FIG. 6C). On the other hand, since the relay terminal (R2) shifts the packet transmission timing with the relay terminal (R1), the proxy terminal (R → D) is not transmitted at this timing.

  In response to this, the source terminal (S) and the destination terminal (D) can perform proxy packet receiving operations P3b and P3c (FIGS. 6B and 6E). In response to receiving the proxy packet, the transmission source terminal (S) changes the terminal identifier expected as the transmission source of the wireless reply packet from the terminal identifier of the destination terminal (D) to the terminal identifier of the relay terminal (R1). change.

  Next, when the destination terminal (D) receives the proxy packet and performs the wireless reply packet sending operation P4a (FIG. 6 (e)), the wireless transmission packet is transmitted to the relay terminal (R1) and the relay terminal. The receiving operations P4c and P4b are performed in both (R2) (FIGS. 6C and 6D). At this time, since the relay terminal (R2) has received the wireless reply packet (D → R) from the destination terminal (D), the relay terminal (R2) determines not to transmit the proxy packet (R → D). As described above, the relay terminal (R2) waits until it transmits the proxy packet in the period T after receiving the wireless reply packet transmitted from the source terminal (S), and receives the proxy packet. It is determined that the operation of transmitting the proxy packet is not performed.

  Thereafter, the relay terminal (R1) generates a proxy reply packet and performs a transmission operation P5a, and the transmission source terminal (S) performs a reception operation P5b of the proxy reply packet transmitted from the relay terminal (R1). it can.

  According to this wireless communication system, even when there are a plurality of relay terminals, packets transmitted from both relay terminals do not collide, and communication can be performed reliably. Further, in this wireless communication system, since a plurality of relay terminals do not transmit wastefully, the communication band can be used effectively.

[Second Embodiment]
Next, a radio communication system according to the second embodiment will be described. In addition, about the part similar to the above-mentioned 1st Embodiment, the detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The wireless communication system shown as the second embodiment does not generate a proxy packet addressed to a wireless terminal that cannot communicate with the relay terminal (R).

  The relay wireless terminal 20 stores the fact that the wireless terminal is a communication disabled terminal when wireless communication with the wireless terminal of the communication partner is impossible as a result of sending the proxy packet from the transmission unit 23 22 is stored (communication impossible terminal storage means). Then, the proxy packet generation unit 21b does not generate a proxy packet addressed to the wireless terminal of the communication partner that is stored in the storage unit 22 as being incapable of communication. That is, the proxy packet generator 21b detects that there is no reply from the communication partner wireless terminal within a predetermined time after the wireless transmission packet is transmitted from the transmission source wireless terminal 10 to the communication partner wireless terminal. Does not generate proxy packets.

  Specifically, in the wireless communication system, as shown in FIG. 7A, the transmission source terminal (S) and the destination terminal (D) can wirelessly communicate with each other, and the transmission source terminal (S) communicates wirelessly. There may be an irrelevant terminal (A) that is capable of wireless communication with the destination terminal (D).

  In this case, when the transmission source terminal (S) performs the transmission operation P1a of the wireless transmission packet (FIG. 7 (b)), not only the reception operation P1b by the destination terminal (D) (FIG. 7 (c)) but also an irrelevant terminal. The reception operation P1c by (A) is performed (FIG. 7 (d)). The destination terminal (D) performs a wireless reply packet transmission operation P2a to the transmission source terminal (S) (FIG. 7C), and the transmission source terminal (S) performs a wireless reply packet reception operation P2b (FIG. 7). 7 (b)).

  On the other hand, the irrelevant terminal (A) tries to function as the relay wireless terminal 20 and cannot receive the wireless reply packet in the standby operation P2c for a predetermined time after receiving the wireless transmission packet. In this case, the irrelevant terminal (A) performs the proxy packet transmission operation P3 with the destination terminal (D) as the destination (FIG. 7 (d)). However, since the destination terminal (D) does not exist within the wireless communication range of the irrelevant terminal (A), the wireless reply packet receiving operation P4 by the irrelevant terminal (A) is not performed (FIG. 7 (d)). Therefore, the irrelevant terminal (A) can store the destination terminal (D) in the storage unit 22 as the wireless terminal of the communication partner. For this reason, even if a wireless transmission packet is transmitted from the transmission source terminal (S) after registering the destination terminal (D) as a wireless terminal that cannot communicate, the proxy packet is not transmitted, and an unnecessary proxy packet is It is possible to avoid being transmitted.

  Further, in this wireless communication system, it is desirable to periodically delete the information of the communication disabled terminal stored in the storage unit 22. Thereby, for example, when a wireless terminal moving like the illumination remote controller 3 is included in the wireless communication system, it is possible to cope with a change in arrangement. For example, it is possible to avoid disabling communication even though the location of the transmission source wireless terminal 10 has moved and relayed by the relay wireless terminal 20.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

DESCRIPTION OF SYMBOLS 1 Wireless controller 2a Window sensor 2b Smoke sensor 2c Human sensor 2d Electric power sensor 3 Illumination remote control 4 Lighting fixture 5 Buzzer 10 Transmission origin wireless terminal 11 Arithmetic part 11a Proxy processing detection part 11b Reply source change part 12 Storage part 13 Transmission part 14 Reception Unit 20 relay wireless terminal 21 calculation unit 21a other communication detection unit 21b proxy packet generation unit 21c proxy reply packet generation unit 22 storage unit 23 transmission unit 24 reception unit

Claims (7)

A wireless communication system including a plurality of wireless terminals and at least one relay device,
The relay device is
Communication detecting means for detecting that a packet is transmitted from the first wireless terminal to the second wireless terminal;
When no reply is received from the second wireless terminal within a predetermined time after the packet is sent from the first wireless terminal to the second wireless terminal by the communication detection means, the transmission source identifier is set as its own identifier, Proxy packet generation means for generating a proxy packet with information indicating that the packet is generated on behalf of
When there is a reply from the second wireless terminal, the transmission source identifier of the reply packet from the second wireless terminal is changed to its own identifier, and the transmission destination identifier of the reply packet is changed to the identifier of the first wireless terminal. Proxy reply packet generating means for generating the proxy reply packet changed to
Communication means for sending the proxy packet and the proxy reply packet;
The first wireless terminal is
Communication detecting means for detecting that the proxy packet is transmitted by the relay device;
Reply to change the identifier expected as a reply source of the transmitted packet from the identifier of the second wireless terminal to the identifier of the relay device when the communication detection unit detects that the proxy packet is transmitted A wireless communication system, comprising: an original changing means. The relay device determines that the second wireless terminal is a non-communication terminal when wireless communication with the second wireless terminal is impossible as a result of sending the proxy packet from the communication means. Further comprising a communication impossible terminal storage means for storing,
The wireless communication system according to claim 1, wherein the proxy packet generating unit does not generate the proxy packet addressed to the second wireless terminal stored in the communication-disabled terminal storage unit.   The wireless communication system according to claim 2, wherein the relay device periodically deletes information of a communication disabled terminal stored in the communication disabled terminal storage unit. A relay device capable of wireless communication with a plurality of wireless terminals,
Communication detecting means for detecting that a packet is transmitted from the first wireless terminal to the second wireless terminal;
When no reply is received from the second wireless terminal within a predetermined time after the packet is sent from the first wireless terminal to the second wireless terminal by the communication detection means, the transmission source identifier is set as its own identifier, Proxy packet generation means for generating a proxy packet with information indicating that the packet is generated on behalf of
When there is a reply from the second wireless terminal, the transmission source identifier of the reply packet from the second wireless terminal is changed to its own identifier, and the transmission destination identifier of the reply packet is changed to the identifier of the first wireless terminal. Proxy reply packet generating means for generating the proxy reply packet changed to
A relay device comprising: communication means for sending the proxy packet and the proxy reply packet. A relay device program capable of wireless communication with a plurality of wireless terminals,
A computer of the relay device;
Communication detecting means for detecting that a packet is transmitted from the first wireless terminal to the second wireless terminal;
When no reply is received from the second wireless terminal within a predetermined time after the packet is sent from the first wireless terminal to the second wireless terminal by the communication detection means, the transmission source identifier is set as its own identifier, Proxy packet generation means for generating a proxy packet with information indicating that the packet is generated on behalf of
When there is a reply from the second wireless terminal, the transmission source identifier of the reply packet from the second wireless terminal is changed to its own identifier, and the transmission destination identifier of the reply packet is changed to the identifier of the first wireless terminal. Proxy reply packet generating means for generating the proxy reply packet changed to
A relay device program that functions as communication means for transmitting the proxy packet and the proxy reply packet. A wireless terminal capable of wireless communication with at least one relay device,
A communication means capable of exchanging packets with the relay device;
After transmitting a wireless transmission packet by the communication means, it is detected that a proxy packet with information indicating that it is a packet generated on behalf of the transmission source identifier is sent by the relay device. Communication detecting means for
Reply to change the identifier expected as a reply source of the transmitted packet from the identifier of the second wireless terminal to the identifier of the relay device when the communication detection unit detects that the proxy packet is transmitted A wireless terminal comprising: original changing means. A wireless terminal program capable of wireless communication with at least one relay device,
A computer of the wireless terminal;
A communication means capable of exchanging packets with the relay device;
After transmitting a wireless transmission packet by the communication means, it is detected that a proxy packet with information indicating that it is a packet generated on behalf of the transmission source identifier is sent by the relay device. Communication detecting means for
Reply to change the identifier expected as a reply source of the transmitted packet from the identifier of the second wireless terminal to the identifier of the relay device when the communication detection unit detects that the proxy packet is transmitted A wireless terminal program that functions as a source changing means.

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