JP2008211744A - Wireless device and wireless network with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless device that achieves high speed packet transmission or transfer. <P>SOLUTION: Each of transfer tables 15-12, 15-13 and 15-14 includes an IP address and MAC address formed corresponding thereto. Referring solely to the transfer table 15-12, a transfer module 14 of the wireless device 31 adds a MAC header for transmitting a packet to the wireless device 36 through the wireless device 32 to an IP packet received from a communication module 16, and then transmits the MAC header to a wireless device 32. Referring solely to the transfer table 15-13, the transfer module 14 of the wireless device 32 transfers the packet received from the wireless device 31 to the wireless device 36, and then, the communication module 16 of the wireless device 36 receives the packet transmitted from the wireless device 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless device and a wireless network including the wireless device, and more particularly to a wireless device used for an ad hoc network and a wireless network including the wireless device.

  In ITS (Intelligent Transport Systems), which is expected to utilize wireless multi-hop communication, a higher response speed than the current response speed is required.

  Currently, transmission and forwarding of IP (Internet Protocol) packets are performed by UDP (User Datagram Protocol) using a routing table and an ARP (Address Resolution Protocol) table (Non-patent Document 1).

  FIG. 21 is a conceptual diagram showing conventional packet transmission and transfer. A packet transmission operation and a transfer operation when the wireless device A transmits a packet to the wireless device C via the wireless device B will be described.

  In this case, the wireless device A holds the routing table RT_A and the ARP table ARP_A. Also, the wireless device B holds a routing table RT_B and an ARP table ARP_B. Further, the wireless device C holds a routing table RT_C and an ARP table ARP_C.

  When transmitting a packet to the wireless device C, the UDP of the wireless device A refers to the routing table RT_A, detects the IP address IPadd_B corresponding to the IP address IPadd_C of the wireless device C that is the transmission destination, and wirelessly transmits the packet. It detects that the next wireless device when transmitting to device C is wireless device B.

  Thereafter, the UDP of the wireless device A refers to the ARP table ARP_A and detects the MAC address MACadd_B corresponding to the IP address IPadd_B of the wireless device B.

  Then, the UDP of the wireless device A transmits a packet to the wireless device B based on the detected MAC address MACadd_B.

  The UDP of the wireless device B receives the packet transmitted from the wireless device A via L1 and L2. Then, the UDP of the wireless device B refers to the header of the received packet and detects that the transmission destination of the packet is the wireless device C. Thereafter, the UDP of the wireless device B refers to the routing table RT_B, detects the IP address IPadd_C corresponding to the IP address IPadd_C of the wireless device C that is the transmission destination, and transmits the packet to the wireless device C next. It is detected that the wireless device is the wireless device C.

  Thereafter, the UDP of the wireless device B refers to the ARP table ARP_B and detects the MAC address MACadd_C corresponding to the IP address IPadd_C of the wireless device C.

  Then, the UDP of the wireless device B transmits a packet to the wireless device C based on the detected MAC address MACadd_C.

  Then, the UDP of the wireless device C receives the packet transmitted from the wireless device B via L1 and L2. As a result, the packet is transmitted from the wireless device A to the wireless device C via the wireless device B.

  Thus, the wireless device A refers to the routing table RT_A and the ARP table ARP_A and transmits the packet to the wireless device B, and the wireless device B refers to the routing table RT_B and the ARP table ARP_B and transmits the packet to the wireless device C. Forward to.

  When transmitting a packet to the wireless device A, the wireless device C refers to the routing table RT_C and the ARP table ARP_C and transmits the packet to the wireless device B. The wireless device B transmits the routing table RT_B and the ARP table ARP_B. The packet is transferred to the wireless device A with reference. The wireless device A receives the packet transmitted from the wireless device C.

Therefore, conventionally, each wireless device transmits or forwards a packet with reference to both the routing table and the ARP table.
"Detailed TCP / IP Vol.1 Protocol" by W. Richard Stevens, translated by Yasuo Tachibana, translated by Naoji Inoue

  However, if packets are transmitted or transferred with reference to both the routing table and the ARP table, there is a problem that it is difficult to speed up wireless communication.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a radio apparatus capable of speeding up transmission or transfer of a packet.

  Another object of the present invention is to provide a wireless network including a wireless device capable of speeding up packet transmission or transfer.

  According to this invention, the wireless device is a wireless device used in a wireless network that is established autonomously, and includes a communication table and a communication unit. The communication table includes a first type of address and a second type of address that is associated with the first type of address and is different from the first type of address. The communication means transmits or relays the packet with reference to only the communication table.

  Preferably, the communication means transmits or relays the packet according to an on-demand type routing protocol.

  Preferably, the first type address includes at least a first type address of any one of an adjacent wireless device, a transmission source wireless device, and a transmission destination wireless device adjacent to the wireless device. The second type address consists of the second type address of the adjacent wireless device.

  Preferably, the wireless device further includes a creation unit. The creating means creates a communication table by transmitting / receiving a route establishment request and a route establishment approval.

  Preferably, the communication means transmits or relays the packet according to a table-driven routing protocol.

  Preferably, the first type address includes a first type address of a wireless device existing at a position of 1 hop or more from the wireless device. The second type address includes a second type address of an adjacent wireless device adjacent to the wireless device.

    Preferably, the wireless device further includes a creation unit. The creating means creates a communication table by transmitting and receiving topology information in the wireless network.

  Preferably, when the wireless device is a transmission source wireless device, or when the wireless device is a relay that relays a packet from the transmission source side to the transmission destination side, the communication unit The packet is transmitted or relayed with reference to the address of the first type and the address of the second type of the neighboring wireless device associated with the first type of address of the destination wireless device.

  Preferably, when the wireless device is a destination wireless device, or when the wireless device is a relay that relays a packet from the destination side to the source side, The packet is transmitted or relayed with reference to the first type address and the second type address of the neighboring wireless device associated with the first type address of the transmission source wireless device.

  According to the present invention, a wireless network includes the wireless device according to any one of claims 1 to 9.

  In the present invention, each wireless device refers to only the communication table including the first type address and the second type address, and performs packet transmission processing or transfer processing.

  Therefore, according to the present invention, it is possible to speed up the packet transmission process or transfer process as compared with the case where the packet transmission process or transfer process is performed with reference to both the routing table and the ARP table.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a schematic diagram of a wireless network using a wireless device according to an embodiment of the present invention. The wireless network 100 includes wireless devices 31 to 43. The wireless devices 31 to 43 are arranged in a wireless communication space and autonomously configure a network. The antennas 51 to 63 are attached to the wireless devices 31 to 43, respectively.

  For example, when transmitting a packet from the wireless device 31 to the wireless device 42, the wireless devices 32 and 35 to 41 relay the packet from the wireless device 31 and deliver the packet to the wireless device 42.

  In this case, the wireless device 31 can perform wireless communication with the wireless device 42 via various routes. That is, the wireless device 31 can perform wireless communication with the wireless device 42 via the wireless devices 37 and 41, and perform wireless communication with the wireless device 42 via the wireless devices 32, 36, and 39. It is also possible to perform wireless communication with the wireless device 42 via the wireless devices 32, 35, 38, and 40.

  When wireless communication is performed via the wireless devices 37 and 41, the number of hops is “3”, and when wireless communication is performed via the wireless devices 32, 36, and 39, the number of hops is “4”. When wireless communication is performed via 32, 35, 38, 40, the number of hops is “5”.

  Thus, in the wireless network 100, the packet is transmitted from the transmission source to the transmission destination by multi-hop.

  In the following, a method for transmitting and transferring a packet at high speed when the packet is transmitted from the transmission source to the transmission destination will be described.

[Embodiment 1]
In the first embodiment, each of the wireless devices 31 to 43 performs wireless communication according to an on-demand protocol. The on-demand protocol constructs a route to a destination for the first time when a data transmission request is generated, and DSR (Dynamic Source Routing) and AODV (Ad Hoc On-Demand Distance Vector Routing) are known. ing.

  Accordingly, each of the wireless devices 31 to 43 constructs a route to the destination according to the AODV protocol, for example, and transmits / receives a packet along the constructed route.

  FIG. 2 is a schematic block diagram showing the configuration of the wireless device 31 shown in FIG. 1 in the first embodiment. The wireless device 31 includes an antenna 11 and a communication control unit 12. The antenna 11 constitutes each of the antennas 51 to 63 shown in FIG. The antenna 11 receives data from other wireless devices via the wireless communication space, outputs the received data to the communication control unit 12, and transmits the data from the communication control unit 12 via the wireless communication space. Send to other wireless device.

  The communication control unit 12 has an ARPA (Advanced Research Projects Agency) Internet hierarchical structure, and performs communication control according to the ARPA hierarchical structure. The communication control unit 12 includes a wireless interface module 13, a transfer module 14, a transfer table 15, and a communication module 16.

  The wireless interface module 13 belongs to the physical layer, modulates / demodulates a transmission signal or a reception signal according to a predetermined rule, and transmits / receives a signal via the antenna 11.

  The transfer module 14 belongs to a MAC (Media Access Control) layer lower than the Internet layer, and acquires a correspondence table between an IP (Internet Protocol) address and a MAC address of each wireless device by a method described later. In addition, the transfer module 14 creates a transfer table 15 indicating a route for transmitting or transferring a packet by a method described later. Further, the transfer module 14 outputs a packet received from another wireless device via the antenna 11 and the wireless interface module 13 to the communication module 16, or an adjacent wireless device on the route to the transmission destination based on the transfer table 15. Forward to. The packet transfer process will be described in detail later. Further, when receiving the IP packet from the communication module 16, the transfer module 14 creates a packet by adding a MAC header to the received IP packet, and transmits the created packet via the wireless interface module 13 and the antenna 11. To do.

  The transfer table 15 belongs to the MAC layer, and stores path information in association with a transmission destination, as will be described later.

  The communication module 16 includes various modules belonging to the Internet layer, the transport layer, and the application layer. Then, the communication module 16 generates a TCP (Transmission Control Protocol) packet based on the data, and generates an IP packet based on the generated TCP packet. The IP packet is composed of an IP header and an IP data part for storing the TCP packet. Then, when generating the TCP packet, the communication module 16 stores the generated TCP packet in the IP data part to generate an IP packet, and outputs the generated IP packet to the transfer module 14.

  Note that each of the wireless devices 32 to 43 illustrated in FIG. 1 has the same configuration as the configuration of the wireless device 31 illustrated in FIG. 2.

  FIG. 3 is a configuration diagram of the transfer table 15 shown in FIG. The transfer table 15 includes a transmission destination and the next wireless device. The transmission destination and the next wireless device are associated with each other. “Destination” represents the IP address of the destination wireless device. “Next wireless device” represents a MAC address of a wireless device to be transmitted next when a packet is transmitted to a transmission destination.

  FIG. 4 is a configuration diagram of a packet. The packet PKT includes a MAC header part, a data part, and an FCS (Frame Check Sequence). The MAC header part stores packet control information. The data part stores IP packets. FCS is a value for detecting whether or not there is an error in the header part and data part of the frame.

  The MAC header part is composed of a frame control part, duration / ID, addresses 1 to 4 and a sequence control part. The frame control unit stores MAC frame control information. The duration is a scheduled time (μs) for using the wireless line.

  Address 1 stores a MAC address of a transmission destination when transmitting a packet PKT between two adjacent wireless devices. Address 2 stores a MAC address of a transmission source when a packet is transmitted between two adjacent wireless devices. Address 3 stores the ID of the cell to which the wireless network 100 belongs. Address 4 stores the final destination IP address.

  The sequence control unit indicates the sequence number of the MAC frame and the fragment number for the fragment.

  The frame control unit includes a protocol / version, a type, a subtype, a To DS, a From DS, a More Frag, a Retry, a PM (Power Management), a WEP, and an Order.

  The protocol / version indicates the version of the IEEE 802.11 MAC protocol, and is normally fixed to “0”. The type and subtype indicate the frame type. To DS indicates whether or not the area of address 4 is provided in the packet PKT. When the area of address 4 is provided in the packet PKT, “1” is set, and the area of address 4 is provided in the packet PKT. When not present, “0” is set. From DS indicates whether or not the packet PKT is a transferred packet. When the packet PKT is a transferred packet, “1” is set. When the packet PKT is not a transferred packet, “0” is set. Is set. More Frag is used in a special case in which a packet in a layer higher than the MAC layer is divided and transmitted, and when “1” is stored, it indicates that there is a frame subsequent to the frame. Retry indicates whether or not the frame is a retransmission frame. When “1” is stored, it indicates that the frame is a retransmission frame. PM indicates whether the mode of the transmitting station is the power saving mode. WEP indicates the presence or absence of encryption. Order indicates whether it is a strict ordered service class (a service class whose relay order should not be changed).

[Create correspondence table]
A method for creating a correspondence table between IP addresses and MAC addresses will be described. FIG. 5 is a diagram showing a correspondence table between IP addresses and MAC addresses. A method of creating the transfer table 15 will be described by taking as an example the case where the transfer module 14 of the wireless device 36 of the wireless devices 31 to 43 shown in FIG.

  When creating the transfer table 15, the transfer module 14 of the wireless device 36 acquires the IP address IPadd 36 of the wireless device 36 on which the wireless device 36 is mounted from the communication module 16. Since the transfer module 14 of the wireless device 36 holds the MAC address MACadd 36 of the wireless device 36, the correspondence table is based on the IP address IPadd 36 acquired from the communication module 16 and the held MAC address MACadd 36. RLT1 (see FIG. 5A) is created. When the transfer module 14 of the wireless device 36 creates the correspondence table RLT1, it transmits the created correspondence table RLT1.

  Similarly, the transfer modules 14 of the wireless devices 31 to 35 and 37 to 43 other than the wireless device 36 also create a correspondence table between the IP address and the MAC address in the wireless device on which the wireless device 31 is mounted. Send.

  The transfer module 14 of the wireless device 36 receives the correspondence table RLT2 (see FIG. 5B) from the wireless device 35, and the received correspondence table RLT2 content and the content of the correspondence table RLT1 held by itself. Therefore, the correspondence relationship between the IP address IPadd35 and the MAC address MACadd35 of the correspondence table RLT2 is registered in the correspondence table RLT1. Thereby, the correspondence table RLT1 is updated to the correspondence table RLT3 (see FIG. 5C). Then, when the correspondence table held by itself is updated, the transfer module 14 of the wireless device 36 transmits the updated correspondence table at intervals of 5 seconds, for example.

  Further, the transfer module 14 of the wireless device 36 also receives the correspondence table from the adjacent wireless devices 32, 37, 38, 39, and 41 other than the wireless device 35, and holds it based on the received correspondence table. The correspondence table is updated, and the updated correspondence table is transmitted at intervals of 5 seconds.

  In this way, every time the transfer module 14 of the wireless device 36 updates the correspondence table, the updated correspondence table is transmitted at regular time intervals, and the updated correspondence table is transmitted from other wireless devices at regular time intervals. By receiving, not only the wireless devices 32, 35, 37, 38, 39, 41 adjacent to the wireless device 36, but also the wireless devices 31, 33, 34, 40, 42, 43 separated from the wireless device 36 by 2 hops or more. The correspondence relationship between the IP address IPadd and the MAC address MACadd in the wireless network 100 can also be acquired. Finally, the correspondence table RLT4 (showing the correspondence relationship between the IP address IPadd and the MAC address MACadd in all the wireless devices 31 to 43 in the wireless network 100) (See (d) of FIG. 5).

  When the transfer module 14 of the wireless device 36 receives the correspondence table from the other wireless device after creating the correspondence table RLT4, the transfer module 14 receives the correspondence table from the received correspondence table content and the content of the correspondence table held by itself. If there is a difference, the difference is registered in the correspondence table RLT4 held by itself, the correspondence table RLT4 is updated, and the updated correspondence table RLT4 is periodically transmitted. On the other hand, if there is no difference between the content of the received correspondence table and the content of the correspondence table held by itself, the transfer module 14 of the wireless device 36 stops the periodic transmission of the correspondence table and forwards packets to be described later. Transition to mode.

[Create route and create forwarding table]
When each of the wireless devices 31 to 43 in the wireless network 100 establishes a wireless communication path to a transmission destination using an on-demand protocol, the wireless device 31 to 43 broadcasts a route request packet RREQ including an IP address of the transmission destination. A route reply packet RREP is received from the wireless device and a wireless communication path is established with the transmission destination.

  For example, in FIG. 1, a case where the wireless device 31 establishes a wireless communication path with the wireless device 42 will be described as an example. FIG. 6 and FIG. 7 are first and second schematic diagrams showing packet flows when a wireless communication path is established, respectively.

  The communication module 16 of the wireless device 31 includes the IP address IPadd31 of the wireless device 31 that is the transmission source, the IP address IPadd42 of the wireless device 42 that is the transmission destination, the hop number Hop, and the relay wireless device (including the wireless device of the transmission source). A route request packet RREQ = [IPadd42 / IPadd31 / 0 / IPadd31] including the IP address IPadd_T is generated and broadcast. In this case, the transfer table 15 of the wireless device 31 includes a transfer table 15-1 in which no route information is registered (see FIG. 6).

  The route request packet RREQ broadcast from the wireless device 31 is relayed by the wireless devices 32 to 41 and 43 and transmitted to the wireless device 42. In this case, every time the route request packet RREQ is relayed, the wireless devices 32 to 41 and 43, which are relay wireless devices, increment the hop number Hop by “1” and update IPadd_T with its own IP address for transmission. To do. In addition, the wireless devices 32 to 41 and 43 as relay wireless devices register route information in the forwarding table 15 based on the received route request packet RREQ.

  For example, the transfer module 14 of the wireless device 32 receives the route request packet RREQ = [IPadd42 / IPadd31 / 0 / IPadd31], and the received address request packet RREQ = [IPadd42 / IPadd31 / 0 / IPadd31] IPaddress31 (last And detecting that the route request packet RREQ = [IPadd42 / IPadd31 / 0 / IPadd31] is received from the wireless device 31 and the route request packet RREQ = [IPadd42 / IPadd31 / 0 / IPadd31]. “1” is added to “0” to calculate the number of hops Hop = 1, and it is detected that the wireless device 31 is adjacent to the wireless device 32. Then, the transfer module 14 of the wireless device 32 detects the MACadd 31 corresponding to the IPadd 31 with reference to the correspondence table RLT 4 (see (d) of FIG. 5). Then, the transfer module 14 of the wireless device 32 stores the IP address IPadd31 in the IP address of the transfer table 15 and stores the MAC address MACadd31 in the MAC address of the transfer table 15 to create the transfer table 15-2.

  Thereafter, the transfer module 14 of the wireless device 32 acquires the IP address IPaddress 32 of the wireless device 32 from the communication module 16, and based on the acquired IP address IPaddress32, the route request packet RREQ = [IPadd42 / IPadd31 / 0 / IPadd31]. Is updated to the route request packet RREQ = [IPadd42 / IPadd31 / 1 / IPadd32] and relayed.

  The transfer module 14 of the wireless device 36 receives the route request packet RREQ = [IPadd42 / IPadd31 / 1 / IPadd32], and detects the IPaddress32 of the received route request packet RREQ = [IPadd42 / IPadd31 / 1 / IPadd32]. Then, it is detected that the route request packet RREQ = [IPadd42 / IPadd31 / 1 / IPadd32] is received from the wireless device 32, and the route request packet RREQ = [IPadd42 / IPadd31 / 1 / IPadd32] is detected to detect the IPaddress31. It detects that the transmission source of the request packet RREQ is the wireless device 31. Then, since the transfer module 14 of the wireless device 36 detects that the route request packet RREQ transmitted from the wireless device 31 has been received via the wireless device 32, when the wireless device 31 is the final transmission destination, The wireless device 36 detects that the packet needs to be transmitted to the wireless device 32.

  Then, the transfer module 14 of the wireless device 36 detects the MACadd32 corresponding to the IPadd32 with reference to the correspondence table RLT4 (see (d) of FIG. 5). The transfer module 14 of the wireless device 36 stores the IP address IPadd31 in the IP address of the transfer table 15, stores the MAC address MACadd31 in the MAC address of the transfer table 15 in association with the IP address IPadd31, and also stores the IP address IPadd32. Is stored in the IP address of the forwarding table 15, and the MAC address MACadd32 is stored in the MAC address of the forwarding table 15 in association with the IP address IPadd32 to create the forwarding table 15-3 (see FIG. 6). As a result, the transfer module 15 of the wireless device 36 has a transfer table 15-consisting of route information whose destination is the wireless device 32 adjacent to the wireless device 36 and route information whose destination is the wireless device 31 of the transmission source. 3 is created.

  Thereafter, the transfer module 14 of the wireless device 36 acquires the IP address IPaddress 36 of the wireless device 36 from the communication module 16, and based on the acquired IP address IPaddress 36, the route request packet RREQ = [IPadd42 / IPadd31 / 1 / IPadd32]. Is updated to the route request packet RREQ = [IPadd42 / IPadd31 / 2 / IPadd36] and relayed.

  The transfer module 14 of the wireless device 39 also creates the transfer table 15-4 (see FIG. 6) by the same operation as the transfer module 14 of the wireless device 36, and updates and relays the route request packet RREQ.

  As a result, each of the wireless devices 32 to 41, 43 can detect the wireless device that has transmitted the route request packet RREQ to itself, and the route information from itself to the transmitting wireless device 31 and the wireless device adjacent to itself. The transfer table 15 including the route information up to can be created.

  The communication module 16 of the wireless device 42 that is the transmission destination receives a plurality of route request packets RREQ from the wireless devices 39, 40, and 41 adjacent to the wireless device 42, and accepts wireless communication with the wireless device 31. The wireless device that has transmitted the route request packet RREQ having the smallest number of hops among the plurality of route request packets RREQ is determined as the transmission destination of the route reply packet RREP. For example, the communication module 16 of the wireless device 42 determines the wireless device 39 as the transmission destination of the route reply packet RREP.

  Then, the transfer module 14 of the wireless device 42 creates the transfer table 15-5 by the same operation as the transfer module 14 of the wireless device 36 based on the route request packet RREQ received from the wireless device 39 (see FIG. 6).

  After that, the communication module 16 of the wireless device 42 sends a route reply packet RREP = [IPadd31 / IPadd42 / 0 / containing the destination IP address IPadd31, the source IP address IPadd42, the number of hops, and the IP address IPadd_T of the relay wireless device. IPadd42] is generated and transmitted to the wireless device 39 (see FIG. 7).

  The transfer module 14 of the wireless device 39 receives the route response packet RREP = [IPadd31 / IPadd42 / 0 / IPadd42], and receives the route reply packet RREP = [IPadd31 / IPadd42 / 0 / IPadd42] IP address 42 (at the end). IPaddress 42) is detected to detect that the route reply packet RREP = [IPadd31 / IPadd42 / 0 / IPadd42] is received from the wireless device 42. Then, the transfer module 14 of the wireless device 39 detects the MACadd 42 corresponding to the IPadd 42 with reference to the correspondence table RLT 4 (see (d) of FIG. 5). Then, the transfer module 14 of the wireless device 39 stores the IP address IPadd42 in the IP address of the transfer table 15-4, stores the MAC address MACadd42 in the MAC address of the transfer table 15-4, and transfers the transfer table 15-4. Update to table 15-6 (see FIG. 7).

  Thereafter, the transfer module 14 of the wireless device 39 acquires the IP address IPaddress 39 of the wireless device 39 from the communication module 16, and based on the acquired IP address IPaddress39, the route reply packet RREP = [IPadd31 / IPadd42 / 0 / IPadd42]. Is updated to the route reply packet RREP = [IPadd31 / IPadd42 / 1 / IPadd39]. In the transfer table 14 of the wireless device 39, since the transmission destination of the route reply packet RREP is the wireless device 31, when the wireless device 31 is set as the final transmission destination with reference to the transfer table 15-6, the wireless device 39 is wireless. The device 39 detects that the route reply packet RREP needs to be transmitted to the wireless device 36, and sends the route reply packet RREP = [IPadd 31 / IPadd 42/1 / IPadd 39] to the wireless device 36.

  The transfer module 14 of the wireless device 36 receives the route reply packet RREP = [IPadd31 / IPadd42 / 1 / IPadd39]. Then, the transfer module 14 of the wireless device 36 performs the same operation as the transfer module 14 of the wireless device 39 on the basis of the received route reply packet RREP = [IPadd31 / IPadd42 / 1 / IPadd39]. In addition to updating to the forwarding table 15-7, the route reply packet RREP = [IPadd31 / IPadd42 / 1 / IPadd39] is updated to the route reply packet RREP = [IPadd31 / IPadd42 / 2 / IPadd36] and transmitted to the wireless device 32 ( (See FIG. 7).

  Then, the transfer module 14 of the wireless device 32 receives the route reply packet RREP = [IPadd31 / IPadd42 / 2 / IPadd36] from the wireless device 36, and the received route reply packet RREP = [IPadd31 / IPadd42 / 2 / IPadd36]. Based on the above, by the same operation as the transfer module 14 of the wireless device 39, the transfer table 15-2 is updated to the transfer table 15-8, and the route reply packet RREP = [IPadd31 / IPadd42 / 2 / IPadd36] is changed to the route reply packet. RREP = [IPadd31 / IPadd42 / 3 / IPadd32] is updated and transmitted to the wireless device 31 (see FIG. 7).

  Then, the transfer module 14 of the wireless device 31 receives the route reply packet RREP = [IPadd31 / IPadd42 / 3 / IPadd32] from the wireless device 32, and the received route reply packet RREP = [IPadd31 / IPadd42 / 3 / IPadd32]. Based on the above, the transfer table 15-1 is updated to the transfer table 15-9 (see FIG. 7). Then, the transfer module 14 of the wireless device 31 outputs a route response packet RREP = [IPadd31 / IPadd42 / 3 / IPadd32] to the communication module 16.

  The communication module 16 of the wireless device 31 receives the route reply packet RREP = [IPadd31 / IPadd42 / 3 / IPadd32], and the wireless device 42 receives from the wireless device 31-wireless device 32-wireless device 36-wireless device 39-wireless device 42. It is detected that the establishment of a wireless communication path is accepted.

  When the route reply packet RREP arrives at the wireless device 31, a wireless communication path including the wireless device 31-the wireless device 32-the wireless device 36-the wireless device 39-the wireless device 42 is established.

  As described above, in the first embodiment, in the process of establishing the wireless communication path from the transmission source to the transmission destination according to the on-demand protocol, the wireless devices 31, 32, 36, 39, and 42 on the wireless communication path are established. Transfer modules 14 create transfer tables 15-9, 15-8, 15-7, 15-6, and 15-5, respectively.

  The wireless devices 32, 36, 39 other than the transmission source (= wireless device 31) and the transmission destination (= wireless device 42) relay the route request packet RREQ and route response packet RREP by the transfer module 14.

  Therefore, according to the present invention, the wireless communication path from the transmission source to the transmission destination can be quickly established according to the on-demand protocol.

  When the wireless device 31 establishes a wireless communication path to the wireless device 42, the wireless device 31 transmits data DATA to the wireless device 42.

  An operation for transmitting a packet from a transmission source to a transmission destination will be described.

[1-hop wireless communication]
FIG. 8 is a conceptual diagram of a packet PKT used for one-hop wireless communication. FIG. 9 is a conceptual diagram of one-hop wireless communication. Note that the thick solid line in FIG. 9 indicates the flow of the packet PKT (= DATA).

  When the wireless device 31 performs wireless communication with the wireless device 32, the wireless device 31 has a transfer table 15-10, and the wireless device 32 has a transfer table 15-11 (see FIG. 9).

  When the wireless device 31 transmits the packet PKT to the wireless device 32, the transfer module 14 of the wireless device 31 stores the IP packet received from the communication module 16 in the data part. Then, the transfer module 14 of the wireless device 31 detects the MAC address MACadd32 of the “next wireless device” when the wireless device 32 is the final transmission destination from the transfer table 15-10 (see FIG. 9). A MAC header portion including DS = “0”, From DS = “0”, Address 1 = “MACadd32”, Address 2 = “MACadd31”, Address 3 = “IBSSID”, Address 4 = “IPadd32” is added to the data portion. The packet PKT1 is generated.

  When the transfer module 14 of the wireless device 31 generates the packet PKT 1, it transmits the generated packet PKT 1 to the wireless device 32 via the wireless interface module 13. That is, the transfer module 14 of the wireless device 31 includes the IP address IPadd32 of the destination wireless device 32 and the MAC address MACadd32 of the wireless device 32 (adjacent wireless device adjacent to the wireless device 31) associated with the IP address IPadd32. To transmit the packet PKT1.

  Then, the transfer module 14 of the wireless device 32 receives the packet PKT1 via the wireless interface module 13, and “MACadd32” is set in the address 1 of the MAC header portion of the received packet PKT1. It is detected that IPadd 32 ″ is set, and it is detected that the packet PKT1 is a packet PKT having the wireless device 32 as a final transmission destination. Then, the transfer module 14 of the wireless device 32 outputs the packet PKT1 to the communication module 16, and the communication module 16 receives the packet PKT1 from the transfer module 14 (see FIG. 9).

  When the transmission destination wireless device 32 transmits the packet PKT to the transmission source wireless device 31, the transfer module 14 of the transmission destination wireless device 32 transmits the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet PKT is transmitted to the wireless device 31 with reference to the MAC address MACadd31 of the wireless device 31 (adjacent wireless device adjacent to the wireless device 32) associated with the wireless device 31.

[2-hop wireless communication]
FIG. 10 is a conceptual diagram of a packet PKT used for two-hop wireless communication. FIG. 11 is a conceptual diagram of two-hop wireless communication. Note that the thick solid line in FIG. 11 indicates the flow of the packet PKT in the communication method according to the present invention, and the thick dotted line indicates the flow of the packet PKT in the conventional communication method.

  When the wireless device 31 performs wireless communication with the wireless device 36 via the wireless device 32, the wireless device 31 has a transfer table 15-12, and the wireless device 32 has a transfer table 15-13. The wireless device 36 has a transfer table 15-14 (see FIG. 11).

  When the wireless device 31 transmits a packet PKT (= DATA) to the wireless device 36 via the wireless device 32, the transfer module 14 of the wireless device 31 stores the IP packet received from the communication module 16 in the data portion. Then, the transfer module 14 of the wireless device 31 detects the MAC address MACadd32 of the “next wireless device” when the wireless device 36 is the final transmission destination from the transfer table 15-12 (see FIG. 11). A MAC header portion comprising DS = “1”, From DS = “0”, Address 1 = “MACadd32”, Address 2 = “MACadd31”, Address 3 = “IBSSID”, Address 4 = “IPadd36” is added to the data portion. Then, the packet PKT2 is generated (see FIG. 10), and the generated packet PKT2 is transmitted to the wireless device 32 via the wireless interface module 13. That is, the transfer module 14 of the wireless device 31 includes the IP address IPadd 36 of the transmission destination wireless device 36 and the MAC address MACadd 32 of the wireless device 32 (adjacent wireless device adjacent to the wireless device 31) associated with the IP address IPadd 36. To transmit the packet PKT2.

  Then, the transfer module 14 of the wireless device 32 receives the packet PKT2 via the wireless interface module 13, and detects that “MACadd32” is set in the address 1 of the MAC header portion of the received packet PKT2. It is detected that the packet PKT2 is a packet addressed to the wireless device 32. Then, the transfer module 14 of the wireless device 32 detects that “1” is set in the To DS of the MAC header portion, detects that the address 4 is set, and “MACadd36” is set in the address 4. Detect that it is set. Then, the transfer module 14 of the wireless device 32 detects that the final transmission destination of the packet PKT2 is the wireless device 36, and sets the “next wireless” when the detected wireless device 36 is the final transmission destination. "Device" is detected based on the transfer table 15-13 (see FIG. 11). In this case, since the MAC address of the “next wireless device” corresponding to the IP address IPadd 36 of the wireless device 36 that is the final transmission destination is “MACadd36”, the transfer module 14 of the wireless device 32 performs the transfer table 15. “MACadd36” is detected from −13, the address 1 of the packet PKT2 is rewritten from “MACadd32” to “MACadd36”, the address 2 of the packet PKT2 is rewritten from “MACadd31” to “MACadd32”, and the From DS of the packet PKT2 is “0” “1” is updated to “1” and transmitted to the wireless device 36 (see FIGS. 10 and 11). That is, the transfer module 14 of the wireless device 32 includes the IP address IPadd 36 of the destination wireless device 36 and the MAC address MACadd 36 of the wireless device 36 (adjacent wireless device adjacent to the wireless device 32) associated with the IP address IPadd 36. To relay the packet PKT2.

  The transfer module 14 of the wireless device 36 receives the packet PKT3 via the wireless interface module 13, and “MACadd36” is set in the address 1 of the MAC header portion of the received packet PKT3, and “IPadd36” is set in the address 4. Is detected to detect that the packet PKT3 is a packet PKT having the wireless device 36 as a final transmission destination (see FIG. 10). The transfer module 14 of the wireless device 36 detects that “1” is set in the From DS of the MAC header and detects that the packet PKT3 is a transferred packet. Then, the transfer module 14 of the wireless device 36 outputs the packet PKT3 to the communication module 16, and the communication module 16 receives the packet PKT3 (see FIG. 11).

  Thus, when the wireless device 31 transmits the packet PKT to the wireless device 36 via the wireless device 32, the packet PKT is not the communication module 16 of the wireless device 32 that is a relay terminal, but is lower in level than the communication module 16. The data is transferred to the wireless device 36 by the transfer module 14 provided in the layer. The wireless device 31 refers to only the transfer table 15-12 and transmits the packet PKT2, and the wireless device 32 refers to only the transfer table 15-13 and transfers the packet PKT2 as the packet PKT3. Accordingly, the packet PKT transmission processing time in the wireless device 31 is shortened, the packet PKT transfer processing time in the wireless device 32 is shortened, and the packet PKT transmission processing and transfer processing can be speeded up.

  When the transmission destination wireless device 36 transmits the packet PKT to the transmission source wireless device 31, the transfer module 14 of the transmission destination wireless device 36 transmits the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet PKT is transmitted with reference to the MAC address MACadd32 of the wireless device 32 associated with (the adjacent wireless device adjacent to the wireless device 36).

  When the wireless device 32 is a relay that relays a packet from the transmission destination side to the transmission source side, the transfer module 14 of the wireless device 32 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 31 with reference to the MAC address MACadd31 of the attached wireless device 31 (adjacent wireless device adjacent to the wireless device 32).

[3-hop wireless communication]
FIG. 12 is a conceptual diagram of a packet PKT used for three-hop wireless communication. FIG. 13 is a conceptual diagram of wireless communication using three hops. Note that the thick solid line in FIG. 13 indicates the flow of the packet PKT in the communication system according to the present invention, and the thick dotted line indicates the flow of the packet PKT in the conventional communication system.

  When the wireless device 31 performs wireless communication with the wireless device 39 via the wireless devices 32 and 36, the wireless device 31 has a transfer table 15-15, and the wireless device 32 stores the transfer table 15-16. The wireless device 36 has a transfer table 15-17, and the wireless device 39 has a transfer table 15-18 (see FIG. 13).

  When the wireless device 31 transmits the packet PKT to the wireless device 39 via the wireless devices 32 and 36, the transfer module 14 of the wireless device 31 stores the IP packet received from the communication module 16 in the data part. Then, the transfer module 14 of the wireless device 31 detects the MAC address MACadd32 of the “next wireless device” when the wireless device 39 is the final transmission destination from the transfer table 15-15 (see FIG. 13). A MAC header portion including DS = “1”, From DS = “0”, Address 1 = “MACadd32”, Address 2 = “MACadd31”, Address 3 = “IBSSID”, Address 4 = “IPadd39” is added to the data portion. Then, a packet PKT4 is generated (see FIG. 12), and the generated packet PKT4 is transmitted to the wireless device 32 via the wireless interface module 13 (see FIG. 13). That is, the transfer module 14 of the wireless device 31 includes the IP address IPadd39 of the destination wireless device 39 and the MAC address MACadd32 of the wireless device 32 (adjacent wireless device adjacent to the wireless device 31) associated with the IP address IPadd39. To transmit the packet PKT4.

  Then, the transfer module 14 of the wireless device 32 receives the packet PKT4 via the wireless interface module 13, and detects that “MACadd32” is set in the address 1 of the MAC header portion of the received packet PKT4. It is detected that the packet PKT4 is a packet addressed to the wireless device 32. Then, the transfer module 14 of the wireless device 32 detects that “1” is set in the To DS of the MAC header, detects that the address 4 is set, and sets “IPadd39” in the address 4. It is detected that Then, the transfer module 14 of the wireless device 32 detects that the final transmission destination of the packet PKT4 is the wireless device 39, and “next wireless” when the detected wireless device 39 is set as the final transmission destination. "Device" is detected based on the transfer table 15-16 (see FIG. 13). In this case, since the MAC address of the “next wireless device” corresponding to the IP address IPadd39 of the wireless device 39 that is the final transmission destination is “MACadd36”, the transfer module 14 of the wireless device 32 performs the transfer table 15. -16 detects "MACadd36", rewrites the address 1 of the packet PKT4 from "MACadd32" to "MACadd36", rewrites the address 2 of the packet PKT4 from "MACadd31" to "MACadd32", and sets the From DS of the packet PKT4 to "0" The packet PKT5 updated from “1” to “1” is created and transmitted to the wireless device 36 (see FIGS. 12 and 13). That is, the transfer module 14 of the wireless device 32 includes the IP address IPadd39 of the destination wireless device 39 and the MAC address MACadd36 of the wireless device 36 (adjacent wireless device adjacent to the wireless device 32) associated with the IP address IPadd39. To relay the packet PKT4.

  The transfer module 14 of the wireless device 36 receives the packet PKT5 via the wireless interface module 13, detects that “MACadd36” is set in the address 1 of the MAC header portion of the received packet PKT5, and detects the packet PKT5. Is a packet addressed to the wireless device 36. The transfer module 14 of the wireless device 36 detects that “1” is set in the To DS of the MAC header, detects that the address 4 is set, and sets “IPadd39” in the address 4. It is detected that Further, the transfer module 14 of the wireless device 36 detects that “1” is set in the From DS of the MAC header portion, and detects that the packet PKT5 is a transferred packet. Then, the transfer module 14 of the wireless device 36 detects that the final transmission destination of the packet PKT5 is the wireless device 39, and sets the “next wireless” when the detected wireless device 39 is the final transmission destination. "Device" is detected based on the transfer table 15-17 (see FIG. 13). In this case, since the MAC address of the “next wireless device” corresponding to the IP address IPadd39 of the wireless device 39 which is the final transmission destination is “MACadd39”, the transfer module 14 of the wireless device 36 transmits the transfer table 15. -17 detects “MACadd39”, rewrites address 1 of packet PKT5 from “MACadd36” to “MACadd39”, creates packet PKT6 by rewriting address 2 of packet PKT5 from “MACadd32” to “MACadd36” 39 (see FIGS. 12 and 13). In other words, the transfer module 14 of the wireless device 36 includes the IP address IPadd39 of the destination wireless device 39 and the MAC address MACadd39 of the wireless device 39 (adjacent wireless device adjacent to the wireless device 36) associated with the IP address IPadd39. To relay the packet PKT5.

  The transfer module 14 of the wireless device 39 receives the packet PKT6 via the wireless interface module 13, and “MACadd39” is set in the address 1 of the MAC header portion of the received packet PKT6, and “IPadd39” is set in the address 4. Is detected, and it is detected that the packet PKT6 is a packet PKT having the wireless device 39 as a final transmission destination. The transfer module 14 of the wireless device 39 detects that “1” is set in the From DS of the MAC header portion, and detects that the packet PKT6 is a transferred packet (see FIG. 12). Then, the transfer module 14 of the wireless device 39 outputs the packet PKT6 to the communication module 16, and the communication module 16 receives the packet PKT6.

  Thus, when the wireless device 31 transmits the packet PKT to the wireless device 39 via the wireless devices 32 and 36, the packet PKT is not the communication module 16 of the wireless devices 32 and 36 that are relay terminals, but the communication module 16 The data is transferred to the wireless device 39 by the transfer module 14 provided in a lower layer. The wireless device 31 refers to only the transfer table 15-15 and transmits the packet PKT4. The wireless device 32 refers to only the transfer table 15-16 and transfers the packet PKT4 as the packet PKT5. Transfers packet PKT5 as packet PKT6 with reference to only transfer table 15-17. Accordingly, the packet PKT transmission processing time in the wireless device 31 is shortened, the packet PKT transfer processing time in the wireless devices 32 and 36 is shortened, and the packet PKT transmission processing and transfer processing can be speeded up.

  When the transmission destination wireless device 39 transmits the packet PKT to the transmission source wireless device 31, the transfer module 14 of the transmission destination wireless device 39 transmits the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet PKT is transmitted with reference to the MAC address MACadd36 of the wireless device 36 (adjacent wireless device adjacent to the wireless device 39) associated with.

  When the wireless device 36 is a relay that relays a packet from the transmission destination side to the transmission source side, the transfer module 14 of the wireless device 36 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 32 with reference to the MAC address MACadd32 of the attached wireless device 32 (adjacent wireless device adjacent to the wireless device 36).

  Further, when the wireless device 32 is a relay that relays a packet from the transmission destination side to the transmission source side, the transfer module 14 of the wireless device 32 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 31 with reference to the MAC address MACadd31 of the attached wireless device 31 (adjacent wireless device adjacent to the wireless device 32).

[4-hop wireless communication]
FIG. 14 is a conceptual diagram of a packet PKT used for four-hop wireless communication. FIG. 15 is a conceptual diagram of wireless communication using four hops. Note that the thick solid line in FIG. 15 indicates the flow of the packet PKT in the communication system according to the present invention, and the thick dotted line indicates the flow of the packet PKT in the conventional communication system.

  When the wireless device 31 performs wireless communication with the wireless device 42 via the wireless devices 32, 36, 39, the wireless device 31 has a transfer table 15-9, and the wireless device 32 has a transfer table 15-. 8, the wireless device 36 has a transfer table 15-7, the wireless device 39 has a transfer table 15-6, and the wireless device 42 has a transfer table 15-5 (see FIG. 15). .

  When the wireless device 31 transmits the packet PKT to the wireless device 42 via the wireless devices 32, 36, and 39, the transfer module 14 of the wireless device 31 stores the IP packet received from the communication module 16 in the data portion. The transfer module 14 of the wireless device 31 detects the MAC address MACadd32 of the “next wireless device” when the wireless device 42 is the final transmission destination from the transfer table 15-9 (see FIG. 15), and To A MAC header portion including DS = “1”, From DS = “0”, Address 1 = “MACadd32”, Address 2 = “MACadd31”, Address 3 = “IBSSID”, Address 4 = “IPadd42” is added to the data portion. Then, the packet PKT7 is generated (see FIG. 14), and the generated packet PKT7 is transmitted to the wireless device 32 via the wireless interface module 13 (see FIG. 15). That is, the transfer module 14 of the wireless device 31 includes the IP address IPadd 42 of the transmission destination wireless device 42, and the MAC address MACadd 32 of the wireless device 32 (adjacent wireless device adjacent to the wireless device 31) associated with the IP address IPadd 42. To transmit the packet PKT7.

  Then, the transfer module 14 of the wireless device 32 receives the packet PKT7 via the wireless interface module 13, and detects that “MACadd32” is set in the address 1 of the MAC header portion of the received packet PKT7. It is detected that the packet PKT7 is a packet addressed to the wireless device 32. Then, the transfer module 14 of the wireless device 32 detects that “1” is set in the To DS of the MAC header, detects that the address 4 is set, and sets “IPadd42” in the address 4. It is detected that Then, the transfer module 14 of the wireless device 32 detects that the final transmission destination of the packet PKT7 is the wireless device 42, and “next wireless” when the detected wireless device 42 is the final transmission destination. "Device" is detected based on the transfer table 15-8 (see FIG. 15). In this case, since the MAC address of the “next wireless device” corresponding to the IP address IPadd 42 of the wireless device 42 that is the final transmission destination is “MACadd36”, the transfer module 14 of the wireless device 32 performs the transfer table 15. -8 detects "MACadd36", rewrites the address 1 of the packet PKT7 from "MACadd32" to "MACadd36", rewrites the address 2 of the packet PKT7 from "MACadd31" to "MACadd32", and sets the From DS of the packet PKT7 to "0" The packet PKT8 updated from “1” to “1” is created and transmitted to the wireless device 36 (see FIGS. 14 and 15). That is, the transfer module 14 of the wireless device 32 includes the IP address IPadd42 of the transmission destination wireless device 42 and the MAC address MACadd36 of the wireless device 36 (adjacent wireless device adjacent to the wireless device 32) associated with the IP address IPadd42. To relay the packet PKT7.

  The transfer module 14 of the wireless device 36 receives the packet PKT8 via the wireless interface module 13, detects that “MACadd36” is set in the address 1 of the MAC header portion of the received packet PKT8, and detects the packet PKT8. Is a packet addressed to the wireless device 36. Then, the transfer module 14 of the wireless device 36 detects that “1” is set in the To DS of the MAC header portion, detects that the address 4 is set, and “IPadd42” is set in the address 4. Detect that it is set. Further, the transfer module 14 of the wireless device 36 detects that “1” is set in the From DS of the MAC header portion, and detects that the packet PKT8 is a transferred packet (see FIG. 14). Then, the transfer module 14 of the wireless device 36 detects that the final transmission destination of the packet PKT 8 is the wireless device 42, and sets the “next wireless” when the detected wireless device 42 is the final transmission destination. "Device" is detected based on the transfer table 15-7 (see FIG. 15). In this case, since the MAC address of the “next wireless device” corresponding to the IP address IPadd42 of the wireless device 42 that is the final transmission destination is “MACadd39”, the transfer module 14 of the wireless device 36 transmits the transfer table 15 -7 detects "MACadd39", rewrites address 1 of packet PKT8 from "MACadd36" to "MACadd39", creates packet PKT9 by rewriting address 2 of packet PKT8 from "MACadd32" to "MACadd36" 39 (see FIGS. 14 and 15). That is, the transfer module 14 of the wireless device 36 includes the IP address IPadd42 of the transmission destination wireless device 42 and the MAC address MACadd39 of the wireless device 39 (adjacent wireless device adjacent to the wireless device 36) associated with the IP address IPadd42. To relay the packet PKT8.

  The transfer module 14 of the wireless device 39 receives the packet PKT9 via the wireless interface module 13, detects that “MACadd39” is set in the address 1 of the MAC header portion of the received packet PKT9, and detects the packet PKT9. Is a packet addressed to the wireless device 39. Then, the transfer module 14 of the wireless device 39 detects that “1” is set in the To DS of the MAC header and detects that the address 4 is set, and “IPadd42” is set in the address 4. It is detected that The transfer module 14 of the wireless device 39 detects that “1” is set in the From DS of the MAC header portion, and detects that the packet PKT9 is a transferred packet (see FIG. 14). Then, the transfer module 14 of the wireless device 39 detects that the final transmission destination of the packet PKT 9 is the wireless device 42, and sets the “next wireless” when the detected wireless device 42 is the final transmission destination. "Device" is detected based on the transfer table 15-6 (see FIG. 15). In this case, since the MAC address of the “next wireless device” corresponding to the IP address IPadd42 of the wireless device 42 that is the final transmission destination is “MACadd42”, the transfer module 14 of the wireless device 39 uses the transfer table 15. -6 detects "MACadd42", rewrites address 1 of packet PKT9 from "MACadd39" to "MACadd42", creates packet PKT10 by rewriting address 2 of packet PKT9 from "MACadd36" to "MACadd39" 42 (see FIGS. 14 and 15). That is, the transfer module 14 of the wireless device 39 includes the IP address IPadd42 of the transmission destination wireless device 42 and the MAC address MACadd42 of the wireless device 42 (adjacent wireless device adjacent to the wireless device 39) associated with the IP address IPadd42. To relay the packet PKT9.

  The transfer module 14 of the wireless device 42 receives the packet PKT 10 via the wireless interface module 13, “MACadd42” is set in the address 1 of the MAC header portion of the received packet PKT10, and “IPadd42” is set in the address 4. Is detected, it is detected that the packet PKT10 is a packet PKT having the wireless device 42 as a final transmission destination. Note that the transfer module 14 of the wireless device 42 detects that “1” is set in the From DS of the MAC header portion, and detects that the packet PKT10 is a transferred packet (see FIG. 14). Then, the transfer module 14 of the wireless device 42 outputs the packet PKT10 to the communication module 16, and the communication module 16 receives the packet PKT10.

  Thus, when the wireless device 31 transmits the packet PKT to the wireless device 42 via the wireless devices 32, 36, and 39, the packet PKT is not the communication module 16 of the wireless devices 32, 36, and 39 that are relay terminals. Then, the data is transferred to the wireless device 42 by the transfer module 14 provided in a lower layer than the communication module 16. Then, the wireless device 31 refers to only the transfer table 15-9 and transmits the packet PKT7, and the wireless device 32 refers to only the transfer table 15-8 and transfers the packet PKT7 as the packet PKT8. Refers to only the forwarding table 15-7 and transfers the packet PKT8 as the packet PKT9, and the wireless device 39 refers to only the forwarding table 15-6 and transfers the packet PKT9 as the packet PKT10. Accordingly, the packet PKT transmission processing time in the wireless device 31 is shortened, the packet PKT transfer processing time in the wireless devices 32, 36, and 39 is shortened, and the packet PKT transmission processing and transfer processing can be speeded up.

  When the transmission destination wireless device 42 transmits the packet PKT to the transmission source wireless device 31, the transfer module 14 of the transmission destination wireless device 42 receives the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet PKT is transmitted with reference to the MAC address MACadd39 of the wireless device 39 associated with (the adjacent wireless device adjacent to the wireless device 42).

  When the wireless device 39 is a relay that relays a packet from the transmission destination side to the transmission source side, the transfer module 14 of the wireless device 39 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 36 with reference to the MAC address MACadd36 of the attached wireless device 36 (adjacent wireless device adjacent to the wireless device 39).

  Further, when the wireless device 36 is a relay that relays packets from the transmission destination side to the transmission source side, the transfer module 14 of the wireless device 36 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 32 with reference to the MAC address MACadd32 of the attached wireless device 32 (adjacent wireless device adjacent to the wireless device 36).

  Further, when the wireless device 32 is a relay that relays a packet from the transmission destination side to the transmission source side, the transfer module 14 of the wireless device 32 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 31 with reference to the MAC address MACadd31 of the attached wireless device 31 (adjacent wireless device adjacent to the wireless device 32).

  As described above, the source wireless device 31 refers to only the transfer table 15 to transmit the packet PKT, and the wireless devices 32, 36, 39, and 42 other than the source are lower than the communication module 16. Since the transfer module 14 arranged in the layer outputs the packet PKT received from the wireless device 31, 32, 36, 39 to the communication module 16 of the wireless device or transfers it to another wireless device, the packet is transferred. PKT transfer processing can be speeded up.

  When one-hop wireless communication is performed, the transfer table 15-10 is created in the source wireless device 31, and the transfer table 15-11 is created in the destination wireless device 32 (see FIG. 9). The IP address of the forwarding table 15-10 is the IP address IPadd32 (also referred to as “IP address of the destination wireless device 32”) of the wireless device 32 adjacent to the wireless device 31, and the MAC address of the forwarding table 15-10 is , The MAC address MACadd32 of the wireless device 32 adjacent to the wireless device 31. The IP address of the forwarding table 15-11 is the IP address IPadd31 (also referred to as “IP address of the source wireless device 31”) of the wireless device 31 adjacent to the wireless device 32, and the MAC address of the forwarding table 15-11. The address is the MAC address MACadd31 of the wireless device 31 adjacent to the wireless device 32.

  When two-hop wireless communication is performed, the transfer table 15-12 is created in the wireless device 31 that is the transmission source, the transfer table 15-13 is created in the wireless device 32 that is the repeater, and the wireless device that is the transmission destination At 36, a transfer table 15-14 is created (see FIG. 11). The IP address of the forwarding table 15-12 includes the IP address IPadd36 of the destination wireless device 36 and the IP address IPadd32 of the wireless device 32 adjacent to the wireless device 31, and the MAC address of the forwarding table 15-12 is wireless. It consists of the MAC address MACadd32 of the wireless device 32 adjacent to the device 31. The IP address of the forwarding table 15-13 includes IP addresses IPadd31 and IPadd36 of the wireless devices 31 and 36 adjacent to the wireless device 32, and the MAC address of the forwarding table 15-13 is a wireless device adjacent to the wireless device 32. 31 and 36, MAC addresses MACadd31 and MACadd36. Furthermore, the IP address of the forwarding table 15-14 is composed of the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd32 of the wireless device 32 adjacent to the wireless device 36, and the MAC address of the forwarding table 15-14 is The MAC address MACadd32 of the wireless device 32 adjacent to the wireless device 36.

  When wireless communication by three hops is performed, the transfer table 15-15 is created in the wireless device 31 that is the transmission source, and the transfer table 15-16 is created in the wireless device 32 that is the repeater, and the wireless device that is the repeater. The transfer table 15-17 is created in the device 36, and the transfer table 15-18 is created in the destination wireless device 39 (see FIG. 13).

  The IP address of the forwarding table 15-15 includes the IP address IPadd39 of the destination wireless device 39 and the IP address IPadd32 of the wireless device 32 adjacent to the wireless device 31, and the MAC address of the forwarding table 15-15 is wireless. It consists of the MAC address MACadd32 of the wireless device 32 adjacent to the device 31. The IP address of the forwarding table 15-16 is composed of the IP addresses IPadd31 and IPadd36 of the wireless devices 31 and 36 adjacent to the wireless device 32 and the IP address IPadd39 of the destination wireless device 39. The forwarding table 15-16 The MAC addresses of the wireless devices 31 and 36 adjacent to the wireless device 32 are MAC addresses MACadd31 and MACadd36. Furthermore, the IP address of the forwarding table 15-17 includes the IP address IPadd31 of the transmission source wireless device 31, and the IP addresses IPadd32 and IPadd39 of the wireless devices 32 and 39 adjacent to the wireless device 36. The forwarding table 15-17 MAC addresses of the wireless devices 32 and 39 adjacent to the wireless device 36 are MAC addresses MACadd32 and MACadd39. Further, the IP address of the forwarding table 15-18 is composed of the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd36 of the wireless device 36 adjacent to the wireless device 39, and the MAC address of the forwarding table 15-18 is The MAC address MACadd 36 of the wireless device 36 adjacent to the wireless device 39.

  When four-hop wireless communication is performed, a transfer table 15-9 is created in the transmission source wireless device 31, and a transfer table 15-8 is created in the wireless device 32 that is a repeater. The transfer table 15-7 is created in the device 36, the transfer table 15-6 is created in the wireless device 39 which is a repeater, and the transfer table 15-5 is created in the wireless device 42 of the transmission destination (FIG. 15).

  The IP address of the forwarding table 15-9 is composed of the IP address IPadd42 of the destination wireless device 42 and the IP address IPadd32 of the wireless device 32 adjacent to the wireless device 31, and the MAC address of the forwarding table 15-9 is wireless. It consists of the MAC address MACadd32 of the wireless device 32 adjacent to the device 31. The IP address of the forwarding table 15-8 includes the IP addresses IPadd31 and IPadd36 of the wireless devices 31 and 36 adjacent to the wireless device 32, and the IP address IPadd42 of the destination wireless device 42. The forwarding table 15-8 The MAC addresses of the wireless devices 31 and 36 adjacent to the wireless device 32 are MAC addresses MACadd31 and MACadd36. Further, the IP address of the forwarding table 15-7 includes the IP address IPadd31 of the source wireless device 31, the IP addresses IPadd32 and IPadd39 of the wireless devices 32 and 39 adjacent to the wireless device 36, and the destination wireless device 42. The MAC address of the forwarding table 15-7 includes the MAC addresses MACadd32 and MACadd39 of the wireless devices 32 and 39 adjacent to the wireless device 36. Further, the IP address of the forwarding table 15-6 includes the IP address IPadd31 of the transmission source wireless device 31, and the IP addresses IPadd36 and IPadd42 of the wireless devices 36 and 42 adjacent to the wireless device 39. The forwarding table 15-6 The MAC addresses of the wireless devices 36 and 42 adjacent to the wireless device 39 are MAC addresses MACadd36 and MACadd42. Further, the IP address of the forwarding table 15-5 is composed of the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd39 of the wireless device 39 adjacent to the wireless device 42, and the MAC address of the forwarding table 15-5 is The MAC address MACadd39 of the wireless device 39 adjacent to the wireless device 42 is included.

  When wireless communication is performed with the number of hops of 5 hops or more, the transmission source wireless device creates the transfer table 15 having the same configuration as the transfer table 15-9, and the wireless device adjacent to the transmission source transfers The transfer table 15 having the same configuration as the table 15-8 is created, and the wireless device existing at a position of 2 hops or more from the transmission source or the transmission destination creates the transfer table 15 having the same configuration as the transfer table 15-7. The wireless device adjacent to the transmission destination creates the transfer table 15 having the same configuration as the transfer table 15-6, and the transmission destination wireless device generates the transfer table 15 having the same configuration as the transfer table 15-5. .

  Therefore, the IP address of the forwarding table 15 includes at least an IP address of any one of the adjacent wireless device adjacent to the wireless device, the transmission source wireless device, and the transmission destination wireless device, and the MAC address of the forwarding table 15 is It consists of the MAC address of an adjacent wireless device adjacent to the wireless device. As described above, the detailed configuration of the IP address of the forwarding table 15 varies depending on whether the wireless device is a transmission source, a repeater, or a transmission destination, or the number of hops from the transmission source to the transmission destination. .

  FIG. 16 is a flowchart for illustrating the wireless communication method according to the first embodiment. When a series of operations is started, a wireless communication path is established between the transmission source and the transmission destination according to the on-demand protocol (step S1).

  Each wireless device on the wireless communication path creates the transfer table 15 in the process of establishing the wireless communication path (step S2). Thereafter, the transmission-source wireless device refers to only the transfer table 15 and transmits the packet (step S3), and the wireless device that is a repeater refers to only the transfer table 15 and transfers the packet in the MAC layer ( Step S4). Then, the destination wireless device receives the packet (step S5). Thus, a series of operations is completed.

  According to the first embodiment, the transfer table 15 is created in each wireless device on the wireless communication path in the process of establishing the wireless communication path between the transmission source and the transmission destination according to the on-demand protocol. The wireless device refers to only the forwarding table 15 and transmits the packet, and the wireless device that is a relay forwards the packet at the MAC layer with reference to only the forwarding table 15.

  Therefore, according to the present invention, packet transmission and transfer can be speeded up.

  In the first embodiment, the transfer module 14 and the communication module 16 of the wireless device that is the transmission source or the transmission destination constitute “communication means”, and the transfer module 14 of the wireless device that is a repeater is “communication means”. Is configured.

  In the first embodiment, the transfer table 15 constitutes a “communication table”, and the transfer module 14 that creates the transfer table 15 constitutes “creating means”.

  Further, in the first embodiment, the route request packet RREQ constitutes a “route establishment request”, and the route response packet RREP constitutes “route establishment approval”.

[Embodiment 2]
In the second embodiment, each of the wireless devices 31 to 43 performs wireless communication according to a table-driven protocol. The table-driven protocol periodically exchanges control information related to a route and constructs a route table in advance, and includes FSR (Fish-eye State Routing), OLSR (Optimized Link State Routing), and TBRPF (Topology). (Dissociation Based on Reverse-Path Forwarding) and the like are known.

  Accordingly, each of the wireless devices 31 to 43 constructs a route to a destination according to the OLSR protocol, for example, and transmits / receives a packet along the constructed route.

  FIG. 17 is a schematic block diagram showing the configuration of the radio apparatuses 31 to 43 shown in FIG. 1 in the second embodiment. In the second embodiment, each of wireless devices 31 to 43 includes wireless device 31A shown in FIG.

  The wireless device 31A is the same as the wireless device 31 except that the communication control unit 12 of the wireless device 31 shown in FIG.

  The communication control unit 12A is obtained by adding a routing table 17 in place of the transfer module 14A, the transfer table 15A, and the communication module 16A in the transfer module 14, the transfer table 15, and the communication module 16 of the communication control unit 12 shown in FIG. Others are the same as those of the communication control unit 12.

  The transfer module 14A creates a transfer table 15A based on the topology information of the wireless network 100 acquired by the communication module 16A, and transmits or relays the packet PKT with reference to the created transfer table 15A. The transfer module 14A performs the same functions as the transfer module 14 in other respects.

  The forwarding table 15A has the same configuration as the forwarding table 15 in that it includes an IP address and a MAC address associated with the IP address, but the components of the IP address exist at a position of one hop or more from the wireless device. It differs from the forwarding table 15 in that it consists of the IP address of the wireless device.

  The communication module 16A transmits and receives Hello messages and TC messages, creates a routing table 17 by a method described later, and acquires topology information of the wireless network 100. Other than that, the communication module 16A performs the same function as the communication module 16.

  The routing table 17 includes a destination IP address and an IP address of the next wireless device associated with the destination IP address, and transmits a packet to each of the wireless devices 31 to 43 in the wireless network 100. Holds the route information.

[Create routing table]
A method for creating the routing table 17 will be described. The OLSR protocol is used as the table driven protocol.

  When the wireless devices 31 to 43 create the routing table 17 using the OLSR protocol, the wireless devices 31 to 43 transmit and receive a Hello message and a TC message.

  The Hello message is periodically transmitted for the purpose of distributing information included in each of the wireless devices 31 to 43. By receiving this Hello message, each of the wireless devices 31 to 43 can collect information on peripheral wireless devices, and recognizes what wireless devices exist in the vicinity of the wireless devices.

  In the OLSR protocol, each of the wireless devices 31 to 43 manages local link information. The Hello message is a message for constructing and transmitting the local link information. The local link information includes “link set”, “adjacent radio device set”, “two-hop adjacent radio device set and link set to those radio devices”, “MPR (Multipoint Relay) set”, and “MPR selector set”. including.

  A link set is a link to a set of wireless devices (adjacent wireless devices) through which radio waves directly reach, and each link is expressed by an effective time of a set of addresses between two wireless devices. The valid time is also used to indicate whether the link is unidirectional or bidirectional.

  The neighboring wireless device set is configured by the address of each neighboring wireless device, the retransmitting degree (Willingness) of the wireless device, and the like. The 2-hop adjacent wireless device set represents a set of wireless devices adjacent to the adjacent wireless device.

  The MPR set is a set of wireless devices selected as MPRs. The MPR is a relay radio so that the packet PKT can be transmitted to all the wireless devices 31 to 43 by the minimum necessary number of communication when each packet PKT is transmitted to all the wireless devices 31 to 43 of the wireless network 100. Is to select a device. The MPR selector set represents a set of wireless devices that have selected themselves as MPRs.

  The process of establishing local link information is generally as follows. In the initial stage of the Hello message, each wireless device 31 to 43 transmits a Hello message containing its own address to an adjacent wireless device in order to notify its existence. All of the wireless devices 31 to 43 perform this operation, and each of the wireless devices 31 to 43 grasps what address the wireless device has around itself. In this way, a link set and an adjacent wireless device set are constructed.

  The constructed local link information is continuously sent again by a Hello message again. By repeating this, it is gradually clarified whether each link is bidirectional or what kind of wireless device exists ahead of the adjacent wireless device. Each of the wireless devices 31 to 43 stores the local link information that is gradually constructed in this way.

  Further, information regarding MPR is also periodically transmitted by a Hello message and notified to each of the wireless devices 31 to 43. Each of the wireless devices 31 to 43 selects several wireless devices from among neighboring wireless devices as a set of MPRs as wireless devices that request retransmission of the packet PKT transmitted by itself. Then, since the information regarding this MPR set is transmitted to the adjacent radio apparatus by the Hello message, the radio apparatus that has received this Hello message sets the set of radio apparatuses that it has selected as the MPR as the “MPR selector set”. to manage. By doing in this way, each radio | wireless apparatus 31-43 can recognize immediately which packet apparatus PKT received should be retransmitted.

  When a local link set is established in each of the wireless devices 31 to 43 by transmission / reception of the Hello message, a TC message for notifying the topology of the entire wireless network 100 is transmitted to the wireless devices 31 to 43. This TC message is periodically transmitted by all wireless devices selected as MPRs. Since the TC message includes a link between each wireless device and the MPR selector set, all the wireless devices 31 to 43 of the wireless network 100 know all the MPR sets and all the MPR selector sets. Based on all the MPR sets and all the MPR selector sets, the topology of the entire wireless network 100 can be known. Each of the wireless devices 31 to 43 calculates the shortest path using the topology of the entire wireless network 100 and creates a route table based on the calculated shortest path.

  In addition, each radio | wireless apparatus 31-43 exchanges a TC message frequently separately from a Hello message. MPR is also used for exchanging TC messages.

  The communication module 16A of the wireless devices 31 to 43 transmits and receives the above-described Hello message and TC message, acquires the topology information of the entire wireless network 100 based on the received Hello message and TC message, and acquires the acquired entire wireless network 100 Based on the topology information, the shortest path is calculated, and based on this, the routing table 17 shown in FIG. 17 is created.

  FIG. 18 is a diagram illustrating a specific example of the transfer table 15A according to the second embodiment. The wireless devices 31, 32, 36, 39, and 42 have transfer tables 15A-1, 15A-2, 15A-3, 15A-4, and 15A-5, respectively.

  The IP address of the forwarding table 15A-1 is composed of the IP addresses IPadd32 to IPadd43 of the wireless devices 32 to 43 existing at a position of one hop or more from the wireless device 31, and the MAC address of the forwarding table 15A-1 is assigned to the wireless device 31. It consists of MAC addresses MACadd32 and MACadd37 of adjacent wireless devices 32 and 37.

  The IP address of the forwarding table 15A-2 is composed of the IP addresses IPadd31 and IPadd33 to IPadd43 of the wireless devices 31, 33 to 43 existing at a position one hop or more from the wireless device 32, and the MAC address of the forwarding table 15A-2 Consists of the MAC addresses MACadd31, MACadd35, MACadd36 of the wireless devices 31, 35, 36 adjacent to the wireless device 32.

  Further, the IP address of the forwarding table 15A-3 is composed of IP addresses IPadd31 to IPadd35 and IPadd37 to IPadd43 of the wireless devices 31 to 35 and 37 to 43 existing at positions one hop or more from the wireless device 36, and the forwarding table 15A- The MAC address 3 includes the MAC addresses MACadd32, MACadd35, MACadd37, MACadd38, MACadd39, and MACadd41 of the wireless devices 32, 35, 37, 38, 39, and 41 adjacent to the wireless device 36.

  Further, the IP address of the forwarding table 15A-4 is composed of the IP addresses IPadd31 to IPadd38 and IPadd40 to IPadd43 of the wireless devices 31 to 38 and 40 to 43 existing at positions one hop or more from the wireless device 39, and the forwarding table 15A- The MAC address 4 includes the MAC addresses MACadd36, MACadd38, MACadd40, MACadd41, and MACadd42 of the wireless devices 36, 38, 40, 41, and 42 adjacent to the wireless device 39.

  Further, the IP address of the forwarding table 15A-5 is composed of the IP addresses IPadd31 to IPadd41 and IPadd43 of the wireless devices 31 to 41 and 43 existing at a position of one hop or more from the wireless device 42, and the MAC address of the forwarding table 15A-5. Consists of MAC addresses MACadd39, MACadd40, MACadd41 of wireless devices 39, 40, 41 adjacent to the wireless device 42.

  The transfer table 15A of the wireless devices 33 to 35, 37, 38, 40, 41, and 43 is wireless that exists at a position of one hop or more from the wireless devices 33 to 35, 37, 38, 40, 41, and 43, respectively. It consists of the IP address of the device and the MAC address of the wireless device adjacent to the wireless devices 33 to 35, 37, 38, 40, 41, 43, respectively.

  Therefore, the forwarding table 15A is generally composed of the IP address of a wireless device existing at a position of one hop or more from the wireless device and the MAC address of an adjacent wireless device adjacent to the wireless device.

  FIG. 19 is a conceptual diagram of four-hop wireless communication according to the second embodiment. The transfer tables 15A-1, 15A-2, 15A-3, 15A-4, and 15A-5 shown in FIG. 19 are respectively transferred to the transfer tables 15A-1, 15A-2, 15A-3, and 15A shown in FIG. Among the elements -4 and 15A-5, the wireless communication apparatus includes elements necessary for wireless communication through a wireless communication path including a wireless device 31 -a wireless device 32 -a wireless device 36 -a wireless device 39 -a wireless device 42.

  When transmitting the packet PKT to the wireless device 42, the transfer module 14 </ b> A of the wireless device 31 transmits the IP address IPadd 42 of the transmission destination wireless device 42 and the wireless device 32 (adjacent to the wireless device 31) associated with the IP address IPadd 42. The packet PKT7 is transmitted with reference to the MAC address MACadd32 of the adjacent wireless device.

  The transfer module 14A of the wireless device 32 receives the packet PKT7, and receives the IP address IPadd42 of the destination wireless device 42 and the wireless device 36 associated with the IP address IPadd42 (the adjacent wireless device adjacent to the wireless device 32). ), The packet PKT7 is updated to the packet PKT8, and the updated packet PKT8 is relayed to the wireless device 36.

  Also, the transfer module 14A of the wireless device 36 receives the packet PKT8, and receives the IP address IPadd42 of the wireless device 42 that is the transmission destination and the wireless device 39 associated with the IP address IPadd42 (the adjacent wireless device adjacent to the wireless device 36). The packet PKT8 is updated to the packet PKT9 with reference to the MAC address MACadd39 of), and the updated packet PKT9 is relayed to the wireless device 39.

  Further, the transfer module 14A of the wireless device 39 receives the packet PKT9, and receives the IP address IPadd42 of the wireless device 42 of the transmission destination and the wireless device 42 (the adjacent wireless device adjacent to the wireless device 39) associated with the IP address IPadd42. ), The packet PKT9 is updated to the packet PKT10, and the updated packet PKT10 is relayed to the wireless device 42. Then, the wireless device 42 receives the packet PKT10.

  When the transmission destination wireless device 42 transmits the packet PKT to the transmission source wireless device 31, the transfer module 14A of the transmission destination wireless device 42 receives the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet PKT is transmitted with reference to the MAC address MACadd39 of the wireless device 39 associated with (the adjacent wireless device adjacent to the wireless device 42).

  When the wireless device 39 is a relay that relays packets from the transmission destination side to the transmission source side, the transfer module 14A of the wireless device 39 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 36 with reference to the MAC address MACadd36 of the attached wireless device 36 (adjacent wireless device adjacent to the wireless device 39).

  Further, when the wireless device 36 is a repeater that relays a packet from the transmission destination side to the transmission source side, the transfer module 14A of the wireless device 36 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 32 with reference to the MAC address MACadd32 of the attached wireless device 32 (adjacent wireless device adjacent to the wireless device 36).

  Further, when the wireless device 32 is a relay that relays packets from the transmission destination side to the transmission source side, the transfer module 14A of the wireless device 32 corresponds to the IP address IPadd31 of the transmission source wireless device 31 and the IP address IPadd31. The packet is relayed to the wireless device 31 with reference to the MAC address MACadd31 of the attached wireless device 31 (adjacent wireless device adjacent to the wireless device 32).

  FIG. 20 is a flowchart for explaining a radio communication method according to the second embodiment. The flowchart shown in FIG. 20 is the same as the flowchart shown in FIG. 16 except that steps S1 and S2 in the flowchart shown in FIG. 16 are replaced with steps S1A and S2A, respectively.

  When a series of operations is started, the communication module 16A of each of the wireless devices 31 to 43 acquires the topology information in the wireless network 100 according to the table-driven protocol (Step S1A). Then, the transfer module 14A of each of the wireless devices 31 to 43 creates the transfer table 15A based on the topology information acquired by the communication module 16A (Step S2A). Thereafter, the above-described steps S3 to S5 are sequentially executed, and the series of operations ends.

  As described above, also in the second embodiment, the transmission-source wireless device refers to only the forwarding table 15A and transmits a packet, and the wireless device that is a relay refers to only the forwarding table 15A in the MAC layer. Forward the packet.

  Therefore, according to the present invention, packet transmission and transfer can be speeded up.

  In the second embodiment, the transfer module 14A and the communication module 16A of the wireless device that is the transmission source or the transmission destination constitute “communication means”, and the transfer module 14A of the wireless device that is a repeater is “communication means”. Is configured.

  In the second embodiment, the transfer table 15A constitutes a “communication table”, and the transfer module 14A that creates the transfer table 15A constitutes “creating means”.

[Other methods for obtaining IP address / MAC address correspondence table]
In the above, the transfer modules 14 and 14A of each wireless device periodically transmit the IP address / MAC address correspondence table, whereby the correspondence between the IP address and the MAC address in all the wireless devices in the wireless network 100 is obtained. Although it has been described that the correspondence table indicating the relationship is created, in the present invention, the present invention is not limited to this, and the transfer modules 14 and 14A of each wireless device may create the correspondence table by the following method.
(1) Method using MPR When the OLSR protocol, which is a table-driven protocol, is used, the Hello packet including route information is transmitted to all the wireless devices 31 to 43 in the wireless network 100 using the MPR set as described above. To be sent efficiently. Therefore, by using this MPR set to efficiently transmit the IP address / MAC address correspondence in each wireless device to all the wireless devices 31 to 43 in the wireless network 100, each of the wireless devices 31 to 43 The correspondence table can be created efficiently.

In this case, the wireless device participating in the wireless network 100 broadcasts and notifies its own IP address and MAC address. Upon receiving the notification, the MPR terminal updates the IP address / MAC address correspondence table, and distributes the updated correspondence table by MPR unicast. As each MPR terminal repeats the update of the IP address / MAC address correspondence table and the flooding by MPR, all the wireless devices 31 to 43 in the wireless network 100 efficiently create the correspondence table. In this case, in each wireless device, the transfer module 14A sets a flag until the transfer table 15A is constructed. If the flag is set, the transfer module 14A exchanges the information including the MAC address information in the MPR list. When the transfer table 15A is constructed, the transfer module 14A shifts to a mode for performing packet transmission processing or transfer processing.
(2) Method using the arp function The transfer modules 14 and 14A of each wireless device transmit the packet PKT_SRCH including the IP address of the wireless device to be known by flooding using the ARP function. Then, the transfer module 14 or 14A of the wireless device that has received the packet PKT_SRCH stores and transfers the IP address / MAC address of the wireless device in which the wireless device is mounted in the packet PKT_SRCH, and unregistered IP in the packet PKT_SRCH. If there is an address / MAC address, it is registered in the correspondence table. This suppresses control traffic and speeds up the construction of the forwarding tables 15 and 15A. Then, the transfer modules 14 and 14A of each wireless device shift to a mode for performing packet transmission processing or transfer processing as soon as the transfer tables 15 and 15A can be created.
(3) Server inquiry method In a wireless mesh network, a parent wireless device serving as an access point operates a DHCP (Dynamic Host Configuration Protocol) server and assigns an IP address to a wireless device accessing itself, It manages a correspondence table of IP addresses / MAC addresses of subordinate wireless devices.

  Then, the transfer modules 14 and 14A of the subordinate wireless device request the wireless device serving as the access point to give an IP address, and simultaneously acquire the IP address / MAC address correspondence table when acquiring the IP address.

  In this server inquiry method, when a wireless device that already exists in the wireless network 100 performs wireless communication with a wireless device that has newly entered the wireless network 100, the IP address / MAC address of the newly entered wireless device. Since the correspondence relationship between the IP address / MAC address of the newly entered wireless device is acquired from the parent wireless device serving as the access point, wireless communication is performed by the method described above.

  In the above description, it has been described that the transfer modules 14 and 14A provided in the lower layer than the communication modules 16 and 16A perform the transmission process or transfer process of the packet PKT based on the transfer tables 15 and 15A. When wireless communication is performed according to the IEEE 802.11 protocol, it is an IP module provided in the Internet layer that controls the wireless communication path. Therefore, when the protocol for performing wireless communication is the IEEE 802.11 protocol, the transfer modules 14 and 14A are provided in the MAC layer, which is a lower layer than the Internet layer. However, when a module other than the IP module controls the wireless communication path using a protocol obtained by improving the IEEE 802.11 protocol or a protocol other than the IEEE 802.11 protocol, the transfer modules 14 and 14A are modules other than the IP module. Is provided in a lower layer than the layer in which is provided. In other words, in the present invention, the transfer modules 14 and 14A are not limited to the MAC layer, which is a lower layer than the Internet layer in which the IP module is provided, and generally control the wireless communication path. It is provided in a lower layer than the layer in which the module is provided. Therefore, the transfer modules 14 and 14A may be provided in the physical layer.

  In the present invention, the IP address constitutes a “first type address”, and the MAC address constitutes a “second type address”.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to a radio apparatus capable of speeding up packet transmission or transfer. In addition, the present invention is applied to a wireless network including a wireless device that can speed up packet transmission or transfer.

1 is a schematic diagram of a wireless network using a wireless device according to an embodiment of the present invention. FIG. 2 is a schematic block diagram illustrating a configuration of the wireless device illustrated in FIG. 1 according to the first embodiment. FIG. 3 is a configuration diagram of a transfer table shown in FIG. 2. It is a block diagram of a packet. It is a figure which shows the conversion table of IP address and MAC address. It is a 1st schematic diagram which shows the flow of the packet at the time of establishment of a radio | wireless communication path | route. It is the 2nd schematic diagram which shows the flow of the packet at the time of establishment of a radio | wireless communication path | route. It is a conceptual diagram of the packet used for the radio | wireless communication by 1 hop. It is a conceptual diagram of the radio | wireless communication by 1 hop. It is a conceptual diagram of the packet used for the radio | wireless communication by 2 hops. It is a conceptual diagram of the radio | wireless communication by 2 hops. It is a conceptual diagram of the packet used for the radio | wireless communication by 3 hops. It is a conceptual diagram of the radio | wireless communication by 3 hops. It is a conceptual diagram of the packet used for the radio | wireless communication by 4 hops. It is a conceptual diagram of the radio | wireless communication by 4 hops. 3 is a flowchart for illustrating a wireless communication method in the first embodiment. FIG. 3 is a schematic block diagram illustrating a configuration of a wireless device illustrated in FIG. 1 in a second embodiment. FIG. 10 is a diagram showing a specific example of a transfer table in the second embodiment. 6 is a conceptual diagram of wireless communication using 4 hops in Embodiment 2. FIG. 10 is a flowchart for illustrating a wireless communication method according to the second embodiment. It is a conceptual diagram which shows transmission and transfer of the conventional packet.

Explanation of symbols

  11, 51-63 antenna, 12, 12A communication control unit, 13 wireless interface module, 14, 14A transfer module, 15, 15A transfer table, 16, 16A communication module, 17 routing table, 31-43 wireless device, 100 wireless network .

Claims (10)

A wireless device used in an autonomously established wireless network,
A communication table that includes a first type address and a second type address that is associated with the first type address and that is different from the first type address;
A wireless device comprising communication means for transmitting or relaying a packet with reference to only the communication table.   The wireless device according to claim 1, wherein the communication unit transmits or relays the packet according to an on-demand routing protocol. The first type address includes at least a first type address of an adjacent wireless device adjacent to the wireless device, a transmission source wireless device, and a transmission destination wireless device,
The wireless device according to claim 2, wherein the second type of address includes a second type of address of the adjacent wireless device.   The radio apparatus according to claim 3, further comprising a creation unit that creates the communication table by transmitting and receiving a path establishment request and a path establishment approval.   The wireless device according to claim 1, wherein the communication unit transmits or relays the packet according to a table-driven routing protocol. The first type address is composed of a first type address of a wireless device existing at a position of 1 hop or more from the wireless device,
The wireless device according to claim 5, wherein the second type address includes a second type address of an adjacent wireless device adjacent to the wireless device.   The radio apparatus according to claim 6, further comprising a creation unit that creates the communication table by transmitting and receiving topology information in the radio network.   When the wireless device is the wireless device of the transmission source, or when the wireless device is a repeater that relays the packet from the transmission source side to the transmission destination side, the wireless communication device of the transmission destination Transmitting or relaying the packet with reference to a second type address of the neighboring wireless device associated with a first type address of the device and a first type address of the destination wireless device; The wireless device according to claim 3, claim 4, claim 6, and claim 7.   When the wireless device is the wireless device of the transmission destination, or when the wireless device is a relay that relays the packet from the transmission destination side to the transmission source side, the wireless communication device of the transmission source Transmitting or relaying the packet with reference to a first type address of the device and a second type address of the neighboring wireless device associated with the first type address of the source wireless device; The wireless device according to claim 3, claim 4, claim 6, and claim 7.   A wireless network comprising the wireless device according to any one of claims 1 to 9.

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