WO2021235257A1 - Wireless communication device, wireless communication method, and program - Google Patents

Wireless communication device, wireless communication method, and program Download PDF

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Publication number
WO2021235257A1
WO2021235257A1 PCT/JP2021/017680 JP2021017680W WO2021235257A1 WO 2021235257 A1 WO2021235257 A1 WO 2021235257A1 JP 2021017680 W JP2021017680 W JP 2021017680W WO 2021235257 A1 WO2021235257 A1 WO 2021235257A1
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Prior art keywords
communication
multicast
node
address
quality
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PCT/JP2021/017680
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French (fr)
Japanese (ja)
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智也 庄司
雄也 下尾
公 小幡
純一 白石
大希 吉田
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株式会社日立国際電気
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Priority to JP2022524387A priority Critical patent/JP7389250B2/en
Publication of WO2021235257A1 publication Critical patent/WO2021235257A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/30—Connectivity information management, e.g. connectivity discovery or connectivity update for proactive routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

Definitions

  • the present invention relates to a wireless communication device, a wireless communication method and a program for performing multicast communication, and in particular, a modulation method can be selected according to the line state of a node on the multicast communication path and excluding the influence of other communication stations.
  • wireless communication methods and programs that can prevent communication errors and ensure communication quality.
  • Multicast communication is often used as a method of information distribution to reduce the load on the line.
  • Multicast communication is a method of performing one-to-many communication unlike the conventional one-to-one (unicast) communication.
  • the multicast communication using the IP (Internet Protocol) protocol is used.
  • Ad hoc multicast routing is used to establish multicast communication on ad hoc networks.
  • ad hoc multicast routing for example, the method described in Japanese Patent No. 5465328 (Patent Document 1) is used.
  • the ad hoc network is a wireless line
  • the target digital data is digitally modulated, frequency-converted, and power amplification is performed.
  • the distance and propagation environment of the wireless line differ depending on the communication partner, it is necessary to select the optimum modulation method according to the change of the line state.
  • Patent Document 2 Japanese Patent No. 5658954 This is a method using retransmission control information and the like, and is effective in one-to-one communication.
  • FIG. 6 A configuration of a communication device that performs conventional multicast communication will be described with reference to FIG.
  • FIG. 6 is a block diagram of a conventional communication device.
  • the conventional communication device includes a network unit 40, a wireless access control unit (MAC unit) 50, and a wireless signal processing / high frequency unit 60.
  • MAC unit wireless access control unit
  • 60 wireless signal processing / high frequency unit 60.
  • the network unit 40 is a CPU (Central Processing Unit), and includes an ad hoc multicast routing unit 41 and a frame generation / analysis unit 42.
  • the ad hoc multicast routing unit 41 controls ad hoc multicast communication, performs routing control to construct an ad hoc network, and generates an ad hoc routing message (ad hoc message). Further, the ad hoc multicast routing unit 41 stores information in which a transmission entry and an IP address of a child node as a transmission destination are associated with each group of multicast communication.
  • the frame generation / analysis unit 42 attaches a MAC (Media Access Control) header to the transmitted IP packet or ad hoc message, generates a transmission MAC frame, and outputs the transmission MAC frame to the wireless access control unit 50. Further, when the received MAC frame is input from the wireless access control unit 50, the frame generation / analysis unit 42 analyzes the frame, extracts an IP packet or an ad hoc message, outputs the IP packet to each unit as appropriate, and outputs the ad hoc message. Is output to the ad hoc multicast routing unit 41.
  • MAC Media Access Control
  • the wireless access control unit 50 includes an FCS (Frame Check Sequence) / transmission timing setting unit 51, a control frame analysis unit 52, a transmission timing control unit 53, an FCS / transmission timing analysis unit 54, and a unicast modulation method discrimination unit. It is equipped with 55.
  • FCS Full Check Sequence
  • the FCS / transmission timing setting unit 51 inserts an error detection code into the input transmission MAC frame. Further, the FCS / transmission timing setting unit 51 outputs the control frame to the control frame analysis unit 52, and sets the transmission timing instructed by the control frame analysis unit 52 in the transmission timing control unit 53. Further, the FCS / transmission timing setting unit 51 attaches the modulation method set by the unicast modulation method determination unit 55 to the transmission MAC frame and outputs the modulation method to the transmission timing control unit 53.
  • the control frame analysis unit 52 analyzes the control frame of the transmission MAC frame, reads the transmission timing setting (predetermined timing or line availability), and instructs the FCS / transmission timing setting unit 51.
  • the transmission timing control unit 53 detects the transmission timing according to the setting, and outputs the transmission MAC frame to the radio signal processing / high frequency unit 60 when the transmission timing is reached. Further, the FCS / transmission timing analysis unit 54 detects an error in the FCS process for the received MAC frame, and if there is an error, performs predetermined processing such as a retransmission request and extracts transmission timing information to obtain the MAC frame. Is output to the network unit 40.
  • the unicast modulation method discriminating unit 55 selects the optimum modulation method in unicast communication.
  • the unicast modulation method discriminating unit 55 receives quality information (equalization error, etc.) when receiving a MAC frame including the MAC address of the communication target station from the radio signal processing / high frequency unit 60, the unicast modulation method discriminating unit 55 is based on the input.
  • the optimum modulation method for performing unicast communication with the transmission source is determined (determined) and set in the FCS / transmission timing setting unit 51.
  • the wireless signal processing / high frequency unit 60 modulates the transmission MAC frame from the wireless access control unit 50 by a specified modulation method, up-converts it, and wirelessly transmits it. Further, the radio signal processing / high frequency unit 60 receives the radio signal, down-converts it, demodulates it, and outputs the MAC frame to the radio access control unit 50. At that time, the wireless signal processing / high frequency unit 60 calculates the communication quality such as the equalization error of the received signal and outputs it to the wireless access control unit 50.
  • FIG. 7 is an explanatory diagram showing adaptive modulation in conventional multicast communication.
  • nodes C and F are reception nodes
  • nodes B and E are relay nodes.
  • node D is neither a relay node nor a receiving node, it sends and receives ad hoc routing messages for network control in order to continue building a wireless link.
  • the unicast modulation method discriminating unit 55 selects the communication quality according to the node having the lowest quality among all the adjacent nodes.
  • the SNR Signal to Noise Ratio
  • the SNR of the node E is 16 dB
  • the SNR of the node D unrelated to the multicast communication is 12 dB. It is 8.3 dB.
  • the node A selects the BPSK (Binary Phase Shift Keying) modulation method according to the node D having the lowest SNR, and performs multicast communication by the BPSK. In other words, a method with a slower transmission speed than necessary will be selected.
  • BPSK Binary Phase Shift Keying
  • the modulation method is selected by the wireless access control unit 50 which is L2 (data link layer), and it is not possible to determine which node is the relay node or the receiving node. This is because processing is performed based on the communication quality in communication with all the nodes in the area.
  • Patent Document 1 Japanese Patent No. 5465328 “Wireless Communication Device and Wireless Communication Method”
  • Patent Document 2 Japanese Patent No. 5658954 “Wireless Communication Device”
  • Patent Document 1 describes a wireless communication device capable of multicast transmission corresponding to both a wired network and a wireless network connected to each other.
  • Patent Document 2 describes a wireless communication device capable of effectively selecting a modulation method and a coding rate in an adaptive modulation coding method.
  • the modulation method is selected by the wireless access control unit which is L2
  • the communication station which is on the multicast communication path and actually waits for reception cannot be identified, and is used for control. Since it reflects the communication quality including the communication stations that perform communication and unicast communication, it is difficult to select an appropriate modulation method, and there is a problem that the communication quality may deteriorate.
  • Patent Documents 1 and 2 do not describe that in multicast communication, the communication quality of a communication station on the route is targeted, and an appropriate modulation method is selected excluding the influence of other communication stations. ..
  • the present invention has been made in view of the above circumstances, and is intended for a communication station that actually waits for reception in multicast communication, and selects an appropriate modulation method excluding the influence of other communication stations to improve the communication quality. It is an object of the present invention to provide a communication device, a communication method and a program that can be secured.
  • the present invention for solving the problems of the above-mentioned conventional example is a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and the communication quality of a plurality of nodes acquired at the time of reception is the node quality.
  • Stored as information, when transmitting multicast communication refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. It is characterized by having a network unit that selects a modulation method based on the minimum value.
  • the network unit stores the reception quality of the received MAC frame in association with the MAC address and the IP address of the transmitting node as node quality information, and also stores the node quality information.
  • the quality information management unit that outputs the lowest value of the reception quality corresponding to the IP address included in the input IP address list, and when transmitting the multicast communication, on the route specified by the group of the multicast communication.
  • a multicast modulation method discriminator that acquires the IP address list of a certain node, outputs the IP address list to the quality information management unit, and selects the modulation method according to the lowest value of the reception quality input from the quality information management unit. It is characterized by being equipped with.
  • the present invention is characterized in that, in the above communication device, the reception quality is an equalization error or a signal-to-noise ratio.
  • the network unit acquires a combination of an IP address and a MAC address from the MAC frame of the received ad hoc message and generates an IP address-MAC address table.
  • IP address-MAC address table It is characterized in that it is provided with a holding unit, and the quality information management unit generates node quality information by referring to an IP address-MAC address table.
  • the present invention is a communication method in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and the communication quality of a plurality of nodes acquired by the communication device at the time of reception is used as node quality information.
  • node quality information when transmitting multicast communication, refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. It is characterized by selecting the modulation method based on the lowest value.
  • the present invention is a program that operates in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and provides node quality information on the communication quality of a plurality of nodes acquired at the time of receiving the communication device.
  • transmitting multicast communication refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. It is characterized in that it functions to select a modulation method based on the minimum value.
  • the present invention is a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and stores the communication quality of a plurality of nodes acquired at the time of reception as node quality information, and performs multicast communication.
  • the node quality information is referred to to determine the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group, and the modulation method is based on the lowest value. Since the communication device has a network unit for selecting, it is possible to identify the communication station on the multicast communication path and select an appropriate modulation method for the communication station actually on the path. It has the effect of preventing the influence of no communication station and ensuring good communication quality.
  • the present invention is a communication method in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and the communication quality of a plurality of nodes acquired by the communication device at the time of reception is node quality.
  • the communication method when transmitting multicast communication, refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. Since the communication method is to select the modulation method based on the minimum value, it is possible to identify the communication station on the multicast communication path and select the appropriate modulation method for the communication station actually on the path. This has the effect of preventing the influence of communication stations that are not on the route and ensuring good communication quality.
  • it is a program that operates in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and determines the communication quality of a plurality of nodes acquired at the time of receiving the communication device.
  • quality information when transmitting multicast communication, refer to the node quality information and select the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. Since it is a program that functions to select the modulation method based on the minimum value, it identifies the communication station on the multicast communication path and selects the appropriate modulation method for the communication station actually on the path. This has the effect of preventing the influence of communication stations that are not on the route and ensuring good communication quality.
  • the communication device (the present communication device) according to the embodiment of the present invention is a communication device that performs multicast communication, and stores the reception quality as node quality information corresponding to the IP address of the node at the time of reception in the network unit.
  • the node quality information when transmitting multicast communication, refer to the node quality information and select the lowest quality communication quality corresponding to the IP address of the node on the route specified by the multicast communication group.
  • the modulation method is selected based on the minimum value, and an appropriate modulation method can be selected for the communication station on the actual multicast communication path, and the influence of the communication station not on the path can be selected. By excluding it, good communication quality can be ensured.
  • this communication method is a communication method in this communication device, and this program is a program that operates in this communication device.
  • FIG. 1 is a block diagram of the configuration of this communication device.
  • the basic configuration of this communication device is the same as the conventional one, and includes a network unit 10, a wireless access control unit (MAC unit) 20, and a wireless signal processing / high frequency unit 30.
  • the radio signal processing / high frequency unit 30 is the same as the conventional radio signal processing / high frequency unit 60 shown in FIG. 6, and detailed description thereof will be omitted.
  • the selection of the modulation method at the time of transmission in the multicast communication is performed by the wireless access control unit 50 which is L2, but in this communication device, it is performed by the network unit 10 which is L3.
  • this communication device can identify the communication stations on the path from the communication stations in the area and select an appropriate modulation method based on the quality of communication with these communication stations. be.
  • FIG. 2 is an explanatory diagram showing an outline of operation of the communication device.
  • the network shown in FIG. 2 is the same as that shown in FIG. 7, and it is assumed that data is transmitted from node A to nodes C and F by multicast communication.
  • the communication quality (SNR) between the node A (this communication device) and each adjacent node is the same as that in FIG. 7.
  • the node B and the node E on the actual multicast communication route are discriminated from the nodes in the area, and the communication quality in the communication with these nodes is determined.
  • Select the modulation method based on That is, although the node D is performing communication for maintaining the wireless link, it is not on the path of the multicast communication. Therefore, the node A communicates with the node D when determining the modulation method of the multicast communication. Quality is not reflected. That is, the modulation method of the multicast communication is determined based on the communication quality of the nodes on the multicast communication path.
  • the minimum value of SNR becomes 12 dB
  • the node A selects QPSK (Quadrature Phase Shift Keying) for the transmission of the multicast communication.
  • the transmission speed can be increased as compared with the BPSK selected in the conventional communication device shown in FIG. 7, the throughput can be improved, and the delay during transmission can be reduced.
  • the modulation method is selected based on the information (modulation method selection table) in which the communication quality and the modulation method are associated with each other.
  • the modulation method selection table will be described later.
  • node D Since the preamble is BPSK, node D also receives this and performs carrier sense, and waits for transmission according to the PLCP (Physical Layer Convergence Protocol) frame, or waits for transmission in the Busy state where another communication station is communicating. By doing so, it is possible to avoid signal collision.
  • PLCP Physical Layer Convergence Protocol
  • the network unit 10 includes a control unit such as a CPU, a storage unit, and an interface unit, and the control unit activates a program stored in the storage unit to realize various functions.
  • the network unit 10 has an ad hoc multicast routing unit 11, a frame generation / analysis unit 12, an IP address-MAC address table holding unit 13, a quality information management unit 14, and a multicast modulation as each unit that realizes specific functions. It is provided with a method determination unit 15.
  • the ad hoc multicast routing unit 11 controls the routing of the ad hoc multicast communication as in the conventional case, and shows the source IP address and the destination IP address (multicast group address) of the multicast communication, and the information of the receiving station and the relay station. It manages the combination of child node IP address lists. Then, at the time of multicast transmission, the optimum route corresponding to the multicast group is determined, and a child node IP address list is generated.
  • the combination of the source IP address and the destination IP address is called a multicast participation entry. Further, the combination of the multicast participation entry and the child node IP address list is referred to as multicast group information. Although only one is shown in the figure, a plurality of multicast group information may be stored in the ad hoc multicast routing unit 11. The multicast group information will be described later.
  • the ad hoc multicast routing unit 11 of this communication device outputs a child node IP address list corresponding to the destination multicast group based on the request from the multicast modulation method determination unit 15 described later.
  • the frame generation / analysis unit 12 generates a MAC frame of an IP packet or an ad hoc message to be transmitted as in the conventional case, and extracts an IP packet or an ad hoc message from the received MAC frame. Then, as a feature of this communication device, when an IP packet (referred to as a multicast packet) transmitted by multicast communication is input, the frame generation / analysis unit 12 multicast-modulates the combination of the source IP address and the destination IP address. It is output to the method discriminating unit 15 to receive the designation of the modulation method.
  • a multicast packet referred to as a multicast packet
  • the frame generation / analysis unit 12 of this communication device attaches the modulation method specified by the multicast modulation method determination unit 15 to the MAC frame to be transmitted and outputs the modulation method to the wireless access control unit 20.
  • IP address-MAC address table holding unit 13 acquires a combination of the source IP address and the MAC address from the ad hoc routing message included in the received MAC frame, and generates and stores the IP address-MAC address table. ..
  • the quality information management unit 14 obtains and stores the communication quality of each node based on the received MAC frame, and outputs the lowest quality value among the communication qualities of the destination child node at the time of multicast transmission. It is a thing. When acquiring the reception quality, not only the ad hoc message but also the unicast communication may be used.
  • the quality information management unit 14 inputs a received MAC frame and communication quality information (equalization error, etc.) from the wireless access control unit 20, and node for each node (transmission node in the received MAC frame).
  • the MAC address, the corresponding node IP address, and the equalization error information or the SNR information calculated from the equalization error are stored as a set. This information is called node quality information.
  • the quality information management unit 14 refers to the IP address-MAC address table and specifies the node IP address corresponding to the node MAC address. That is, the quality information management unit 14 accumulates (updates) node quality information each time an ad hoc message is received by the communication device.
  • the node quality information stores the communication quality information of all the nodes communicating with the communication device regardless of whether or not it becomes a child node in multicast communication (whether or not it is on the route of multicast communication). Is.
  • the quality information management unit 14 refers to the node quality information and sets the node IP address included in the input child node IP address list.
  • the corresponding quality information here, SNR information
  • the quality information management unit 14 identifies the lowest (worst quality) value from the specified quality information and outputs it to the multicast modulation method determination unit 15.
  • Multicast modulation method discriminating unit 15 At the time of multicast transmission, the multicast modulation method determination unit 15 selects an appropriate modulation method according to the communication quality with the child node serving as the destination or relay station, and designates it to the frame generation / analysis unit 12.
  • the multicast modulation method discriminating unit 15 performs ad hoc multicast routing based on the source address and the destination IP address. Request the child node IP address list from the unit 11. As a result, the multicast modulation method determination unit 15 acquires a child node IP address list corresponding to the group address to which the data to be transmitted is transmitted. That is, the IP address included in the child node IP address list is the IP address of the node on the route of the multicast communication.
  • the multicast modulation method determination unit 15 outputs the acquired child node IP address list to the quality information management unit 14, and acquires the minimum value of the corresponding quality information. Then, based on the lowest value of the quality information, the modulation method is selected by referring to the modulation method selection table stored internally, and the modulation method is selected and output to the frame generation / analysis unit 12.
  • the network unit 10 of this communication device can similarly select a modulation method not only for multicast communication but also for unicast communication.
  • the frame generation / analysis unit 12 outputs the source IP address and the destination MAC address extracted from the ad hoc message to the multicast modulation method determination unit 15.
  • the multicast modulation method discriminating unit 15 attaches the destination MAC address and inquires the quality information management unit 14 about the modulation method, and the quality information management unit 14 sends the quality information corresponding to the destination MAC address to the multicast modulation method discriminating unit 15. Output.
  • the multicast modulation method determination unit 15 identifies the modulation method based on the input quality information and outputs it to the frame generation / analysis unit 12. In this way, the modulation method in unicast communication can also be appropriately selected based on the communication quality.
  • the configuration of the wireless access control unit 20 is the same as the conventional one, but since the modulation method has already been specified for the MAC frame input from the network unit 10, it is selected by the unicast modulation method determination unit 25.
  • the modulation method is set not to be adopted.
  • FIG. 3 is an explanatory diagram showing the configuration of multicast group information.
  • the multicast group information has a configuration in which a source (own device) IP address 71, a destination IP address 72, and a plurality of child node IP addresses 73-1 to 73-n are concatenated.
  • the destination IP address is a group address that specifies a group of multicast communication, and a receiving node that belongs to the group is specified.
  • the combination of the source IP address and the destination IP address is the multicast participation entry.
  • the child node IP address list is a list in which a plurality of child node IP addresses 73-1 to 73-2 are concatenated. In the multicast communication, an appropriate route passing through these plurality of child nodes is determined, so that the plurality of child node addresses are on the route and become a receiving station or a relay station waiting for a transmission signal from the device. The address of the child node.
  • FIG. 4 is an explanatory diagram showing a frequency selection sequence in the communication device.
  • the radio signal processing / high-frequency unit 30 when the received high-frequency signal is input to the radio signal processing / high-frequency unit 30 (S11), the radio signal processing / high-frequency unit 30 down-converts to a baseband signal, demolishes it, and performs MAC.
  • the frame is output to the radio access control unit 20 (S12).
  • the wireless signal processing / high frequency unit 30 calculates quality information such as equalization error and outputs the quality information to the wireless access control unit 20 (S13).
  • the wireless access control unit 20 outputs the MAC frame to the frame generation / analysis unit 12 of the network unit 10 (S14). Further, as a feature of this communication device, the wireless access control unit 20 outputs a MAC frame to the IP address-MAC address table holding unit 13 and the quality information management unit 14 (S15, S16), and quality information such as equalization error. Is output to the quality information management unit 14 (S17).
  • the frame generation / analysis unit 12 analyzes the MAC frame, outputs an ad hoc message to the ad hoc multicast routing unit 11, and appropriately outputs an IP packet to a display processing unit, a voice output unit, and the like (S18).
  • the IP address-MAC address table holding unit 13 acquires the correspondence information between the IP address and the MAC address from the ad hoc message of the input MAC frame and registers it in the IP address-MAC address table.
  • the quality information management unit 14 calculates the SNR from the input quality information such as the equalization error, and combines the MAC address included in the MAC frame and the IP address included in the ad hoc message input together to form the node quality. Store as information. The quality information management unit 14 performs this process every time reception is performed by the communication device, and accumulates and updates node quality information. If it is received multiple times from the same node, the latest value is stored.
  • the frame generation / analysis unit 12 extracts the destination IP address (multicast group address) corresponding to the multicast group. Then, the source address and the destination IP address are output to the multicast modulation method determination unit 15 (S22).
  • the multicast modulation method determination unit 15 outputs the source address and destination IP address to the ad hoc multicast routing unit 11, and identifies the node waiting for transmission from its own device in the multicast communication.
  • Multicast receiver node IP address list (Child node IP address list) is requested (S23). Then, the multicast modulation method determination unit 15 receives the child node IP address list from the ad hoc multicast routing unit 11 (S24), and sends the child node IP address list to the quality information management unit 14 (S25).
  • the quality information management unit 14 reads the quality information (SNR) corresponding to the IP address included in the input child node IP address list from the stored node quality information, and multicast-modulates the smallest SNR value in the quality information (SNR). Output to the method determination unit 15 (S26).
  • SNR quality information
  • the multicast modulation method discriminating unit 15 that has received the minimum SNR value refers to the modulation method selection table, selects a modulation method corresponding to the SNR value, and outputs it to the frame generation / analysis unit 12 (S27).
  • the frame generation / analysis unit 12 outputs the MAC frame of the multicast packet to be transmitted to the wireless access control unit 20 (S28), and outputs information specifying the modulation method of the MAC frame to the wireless access control unit 20 (S29). ).
  • the wireless access control unit 20 When the wireless access control unit 20 reaches a predetermined transmission timing, the information of the MAC frame and the modulation method is output to the wireless signal processing / high frequency unit 30 (S31, S32), and the wireless signal processing / high frequency unit 30 is designated. It is modulated by the modulation method, converted into a high frequency signal, and wirelessly output (S32). In this way, the sequence in this communication device is performed.
  • FIG. 5 is an explanatory diagram of a modulation method selection table. As shown in FIG. 5, in the modulation method selection table, the selected modulation method and the corresponding SNR threshold value are stored for each item number. When the SNR value (minimum value) input from the quality information management unit 14 is less than each threshold value, the corresponding modulation method is selected.
  • the SNR value (minimum value) is less than 10 dB, BPSK is selected, and if it is 10 dB or more and less than 14 dB, QPSK is selected. If the SNR value is 14 dB or more and less than 20 dB, 16QAM is selected, and if it is 20 dB or more and less than 26 dB, 64QAM is selected.
  • the IP address-MAC address table holding unit 13 is used in the network unit 10.
  • the combination of the IP address and the MAC address is extracted and stored from the received MAC frame of the ad hoc routing message, and the quality information management unit 14 stores the communication quality at the time of reception as the node communication quality corresponding to the IP address.
  • the multicast modulation method determination unit 15 outputs a child node IP address list, which is a relay node and a reception node, corresponding to the combination of the source IP address and the destination IP address to the quality information management unit 14 when transmitting the multicast communication.
  • the quality information management unit 14 outputs the lowest value of the communication quality corresponding to the input IP address list to the multicast modulation method discriminating unit 15, and the multicast modulation method discriminating unit 15 corresponds to the lowest value of the communication quality. Since the communication device, communication method, and program are used to select the modulation method to be used, an appropriate modulation method can be selected for the communication station on the actual multicast communication route, and the influence of the communication station not on the route is excluded. Therefore, there is an effect that good communication quality can be ensured.
  • a modulation method can be selected according to the line state of a node on the multicast communication path and the influence of other communication stations is excluded, communication error can be prevented, and communication quality can be ensured. Suitable for devices, wireless communication methods and programs.

Abstract

Provided are a communication device, a communication method, and a program, which are capable of ensuring communication quality, in multicast communication, by selecting an appropriate modulation scheme according to the line state of the communication station on the route specified by a multicast group, excluding the influence of other communication stations.　The communication device performs multicast communication, at the time of reception, stores the reception quality by means of a network unit 10 as node quality information corresponding to the IP address of a node, at the time of transmission in the multicast communication, refers to the node quality information to obtain a minimum value having a lowest quality among the communication qualities corresponding to the IP addresses of the nodes on the route specified by the multicast communication group, and selects a modulation scheme on the basis of the minimum value.

Description

無線通信装置、無線通信方法及びプログラムWireless communication equipment, wireless communication methods and programs
　本発明は、マルチキャスト通信を行う無線通信装置、無線通信方法及びプログラムに係り、特にマルチキャスト通信の経路上にあるノードの回線状態に合わせ、それ以外の通信局の影響を除いて変調方式を選択でき、通信誤りを防止して通信品質を確保することができる無線通信装置、無線通信方法及びプログラムに関する。 The present invention relates to a wireless communication device, a wireless communication method and a program for performing multicast communication, and in particular, a modulation method can be selected according to the line state of a node on the multicast communication path and excluding the influence of other communication stations. , Related to wireless communication devices, wireless communication methods and programs that can prevent communication errors and ensure communication quality.
［先行技術の説明］
　従来、自律分散アクセスを用いた移動体ネットワークがある。
　このような移動体ネットワークでは、移動通信局間で自律的に端末を検知し、自律的に経路の最適化を実施して、その場限りの無線ネットワーク(アドホックネットワーク)を構築する。これにより、遅延量を少なくしながら、回線の負荷を抑止した通信を実現する。 [Explanation of prior art]
Conventionally, there is a mobile network using autonomous distributed access.
In such a mobile network, terminals are autonomously detected between mobile communication stations, routes are optimized autonomously, and an ad hoc wireless network (ad hoc network) is constructed. This realizes communication in which the load on the line is suppressed while reducing the amount of delay.
　回線の負荷を少なくする情報配信の方法として、マルチキャスト通信がしばしば使われる。マルチキャスト通信は、従来の１対１の（ユニキャスト）通信とは異なり、１対多の通信を行う方式である。
　ネットワーク上でのマルチキャスト通信では、ＩＰ（Internet Protocol）プロトコルを用いたマルチキャスト通信が用いられる。 Multicast communication is often used as a method of information distribution to reduce the load on the line. Multicast communication is a method of performing one-to-many communication unlike the conventional one-to-one (unicast) communication.
In the multicast communication on the network, the multicast communication using the IP (Internet Protocol) protocol is used.
　アドホックネットワーク上でのマルチキャスト通信の確立には、アドホックマルチキャストルーティングが用いられる。アドホックマルチキャストルーティングは、例えば、特許第５４６５３２８号広報（特許文献１）に記載される方法が用いられる。 Ad hoc multicast routing is used to establish multicast communication on ad hoc networks. For the ad hoc multicast routing, for example, the method described in Japanese Patent No. 5465328 (Patent Document 1) is used.
　また、アドホックネットワークは、無線回線であるため、各々の通信においては、対象のデジタルデータをデジタル変調し、周波数変換して、電力増幅を行う。
　この時、無線回線は通信相手によって、距離、伝搬環境が異なるため、回線状態の変化に合わせて、最適な変調方式を選択する必要がある。 Further, since the ad hoc network is a wireless line, in each communication, the target digital data is digitally modulated, frequency-converted, and power amplification is performed.
At this time, since the distance and propagation environment of the wireless line differ depending on the communication partner, it is necessary to select the optimum modulation method according to the change of the line state.
　例えば、回線が安定している場合には、「通信誤りが起きやすいものの、１度の搬送波に複数のデジタル情報を伝送できる」変調方式が好ましく、不安定な場合はその逆の方式を採用することが望まれる。
　最適な変調方式選択については、例えば、特許第５６５８９５４号広報（特許文献２）に記載の方式がある。
　これは、再送制御情報等を用いた方式であり、１対１での通信においては有効なものである。 For example, when the line is stable, a modulation method that "prone to communication errors but can transmit multiple digital information on one carrier wave" is preferable, and when it is unstable, the opposite method is adopted. Is desired.
Regarding the selection of the optimum modulation method, for example, there is a method described in Japanese Patent No. 5658954 (Patent Document 2).
This is a method using retransmission control information and the like, and is effective in one-to-one communication.
[従来の通信装置の構成：図６]
　従来のマルチキャスト通信を行う通信装置の構成について図６を用いて説明する。図６は、従来の通信装置の構成ブロック図である。
　図６に示すように、従来の通信装置は、ネットワーク部４０と、無線アクセス制御部（ＭＡＣ部）５０と、無線信号処理／高周波部６０とを備えている。 [Construction of conventional communication device: FIG. 6]
A configuration of a communication device that performs conventional multicast communication will be described with reference to FIG. FIG. 6 is a block diagram of a conventional communication device.
As shown in FIG. 6, the conventional communication device includes a network unit 40, a wireless access control unit (MAC unit) 50, and a wireless signal processing / high frequency unit 60.
　ネットワーク部４０は、ＣＰＵ（Central Processing Unit）であり、アドホックマルチキャストルーティング部４１と、フレーム生成／解析部４２とを備えている。
　アドホックマルチキャストルーティング部４１は、アドホックマルチキャスト通信を制御するものであり、ルーティング制御を行ってアドホックネットワークを構築し、アドホックルーティングメッセージ（アドホックメッセージ）を生成する。
　また、アドホックマルチキャストルーティング部４１は、マルチキャスト通信のグループ毎に、送信エントリと送信先となる子ノードのＩＰアドレスを対応付けた情報を記憶している。 The network unit 40 is a CPU (Central Processing Unit), and includes an ad hoc multicast routing unit 41 and a frame generation / analysis unit 42.
The ad hoc multicast routing unit 41 controls ad hoc multicast communication, performs routing control to construct an ad hoc network, and generates an ad hoc routing message (ad hoc message).
Further, the ad hoc multicast routing unit 41 stores information in which a transmission entry and an IP address of a child node as a transmission destination are associated with each group of multicast communication.
　フレーム生成／解析部４２は、送信されるＩＰパケットやアドホックメッセージにＭＡＣ（Media Access Control）ヘッダを付して、送信ＭＡＣフレームを生成して無線アクセス制御部５０に出力する。
　また、フレーム生成／解析部４２は、無線アクセス制御部５０から受信ＭＡＣフレームが入力されると、フレームを解析してＩＰパケット又はアドホックメッセージを抽出し、ＩＰパケットを適宜各部に出力し、アドホックメッセージをアドホックマルチキャストルーティング部４１に出力する。 The frame generation / analysis unit 42 attaches a MAC (Media Access Control) header to the transmitted IP packet or ad hoc message, generates a transmission MAC frame, and outputs the transmission MAC frame to the wireless access control unit 50.
Further, when the received MAC frame is input from the wireless access control unit 50, the frame generation / analysis unit 42 analyzes the frame, extracts an IP packet or an ad hoc message, outputs the IP packet to each unit as appropriate, and outputs the ad hoc message. Is output to the ad hoc multicast routing unit 41.
　無線アクセス制御部５０は、ＦＣＳ（Frame Check Sequence）／送信タイミング設定部５１と、制御フレーム解析部５２と、送信タイミング制御部５３と、ＦＣＳ／送信タイミング解析部５４と、ユニキャスト変調方式判別部５５とを備えている。 The wireless access control unit 50 includes an FCS (Frame Check Sequence) / transmission timing setting unit 51, a control frame analysis unit 52, a transmission timing control unit 53, an FCS / transmission timing analysis unit 54, and a unicast modulation method discrimination unit. It is equipped with 55.
　ＦＣＳ／送信タイミング設定部５１は、入力された送信ＭＡＣフレームに誤り検出符号を挿入する。
　また、ＦＣＳ／送信タイミング設定部５１は、制御フレームを制御フレーム解析部５２に出力して、制御フレーム解析部５２から指示された送信タイミングを送信タイミング制御部５３に設定する。
　更に、ＦＣＳ／送信タイミング設定部５１は、ユニキャスト変調方式判別部５５から設定された変調方式を、送信ＭＡＣフレームに付して送信タイミング制御部５３に出力する。 The FCS / transmission timing setting unit 51 inserts an error detection code into the input transmission MAC frame.
Further, the FCS / transmission timing setting unit 51 outputs the control frame to the control frame analysis unit 52, and sets the transmission timing instructed by the control frame analysis unit 52 in the transmission timing control unit 53.
Further, the FCS / transmission timing setting unit 51 attaches the modulation method set by the unicast modulation method determination unit 55 to the transmission MAC frame and outputs the modulation method to the transmission timing control unit 53.
　制御フレーム解析部５２は、送信ＭＡＣフレームの制御フレームを解析して送信タイミングの設定（所定のタイミング、又は回線空き状態）を読み取り、ＦＣＳ／送信タイミング設定部５１に指示する。 The control frame analysis unit 52 analyzes the control frame of the transmission MAC frame, reads the transmission timing setting (predetermined timing or line availability), and instructs the FCS / transmission timing setting unit 51.
　送信タイミング制御部５３は、設定に従って送信タイミングを検出し、送信タイミングになると送信ＭＡＣフレームを無線信号処理／高周波部６０に出力する。
　また、ＦＣＳ／送信タイミング解析部５４は、受信ＭＡＣフレームに対してＦＣＳ処理で誤りを検出して誤りがあれば再送要求等所定の処理を行うと共に、送信タイミングの情報を抽出して、ＭＡＣフレームをネットワーク部４０に出力する。 The transmission timing control unit 53 detects the transmission timing according to the setting, and outputs the transmission MAC frame to the radio signal processing / high frequency unit 60 when the transmission timing is reached.
Further, the FCS / transmission timing analysis unit 54 detects an error in the FCS process for the received MAC frame, and if there is an error, performs predetermined processing such as a retransmission request and extracts transmission timing information to obtain the MAC frame. Is output to the network unit 40.
　ユニキャスト変調方式判別部５５は、ユニキャスト通信において最適な変調方式を選択するものである。
　ユニキャスト変調方式判別部５５は、無線信号処理／高周波部６０から通信対象局のＭＡＣアドレスが含まれたＭＡＣフレームを受信した際の品質情報（等化誤差等）が入力されると、それに基づいて送信元とのユニキャスト通信を行う場合の最適な変調方式を判別（判定）し、ＦＣＳ／送信タイミング設定部５１に設定する。 The unicast modulation method discriminating unit 55 selects the optimum modulation method in unicast communication.
When the unicast modulation method discriminating unit 55 receives quality information (equalization error, etc.) when receiving a MAC frame including the MAC address of the communication target station from the radio signal processing / high frequency unit 60, the unicast modulation method discriminating unit 55 is based on the input. The optimum modulation method for performing unicast communication with the transmission source is determined (determined) and set in the FCS / transmission timing setting unit 51.
　無線信号処理／高周波部６０は、無線アクセス制御部５０からの送信ＭＡＣフレームを指定された変調方式で変調して、アップコンバートし、無線送信する。
　また、無線信号処理／高周波部６０は、無線信号を受信して、ダウンコンバートして復調し、ＭＡＣフレームを無線アクセス制御部５０に出力する。その際、無線信号処理／高周波部６０は、受信信号の等化誤差等の通信品質を算出して、無線アクセス制御部５０に出力する。 The wireless signal processing / high frequency unit 60 modulates the transmission MAC frame from the wireless access control unit 50 by a specified modulation method, up-converts it, and wirelessly transmits it.
Further, the radio signal processing / high frequency unit 60 receives the radio signal, down-converts it, demodulates it, and outputs the MAC frame to the radio access control unit 50. At that time, the wireless signal processing / high frequency unit 60 calculates the communication quality such as the equalization error of the received signal and outputs it to the wireless access control unit 50.
[従来のマルチキャスト通信の適応変調：図７]
　また、ユニキャスト変調方式判別部５５は、マルチキャスト通信においても、通信品質に基づいて適応的に変調方式を選択するようになっていた。
　ここで、従来のマルチキャスト通信における適応変調について図７を用いて説明する。図７は、従来のマルチキャスト通信における適応変調を示す説明図である。 [Adaptive modulation of conventional multicast communication: Fig. 7]
Further, the unicast modulation method discriminating unit 55 has come to adaptively select the modulation method based on the communication quality even in the multicast communication.
Here, adaptive modulation in conventional multicast communication will be described with reference to FIG. 7. FIG. 7 is an explanatory diagram showing adaptive modulation in conventional multicast communication.
　図７に示すように、ノードＡ～Ｆから成るアドホックネットワークにおいて、マルチキャスト通信でノードＡからノードＣ，Ｆにデータを送信する場合、ノードＣ，Ｆは受信ノード、ノードＢ，Ｅは中継ノードとなる。
　ノードＤは中継ノードでも受信ノードでもないものの、無線リンク構築を継続するために、ネットワーク制御用のアドホックルーティングメッセージの送受信を行っている。 As shown in FIG. 7, in an ad hoc network consisting of nodes A to F, when data is transmitted from node A to nodes C and F by multicast communication, nodes C and F are reception nodes, and nodes B and E are relay nodes. Become.
Although node D is neither a relay node nor a receiving node, it sends and receives ad hoc routing messages for network control in order to continue building a wireless link.
　そして、ノードＡにおいて送信時の変調方式を選択する際には、ユニキャスト変調方式判別部５５は、隣接する全ノードの中で最も品質が低いノードに合わせて通信品質を選択する。
　図７の例では、ノードＢとの通信におけるＳＮＲ（Signal to Noise Ratio：信号対雑音比）は１２dBであり、ノードＥのＳＮＲは１６dBであるが、マルチキャスト通信には無関係なノードＤのＳＮＲは８．３dBとなっている。 Then, when selecting the modulation method at the time of transmission in the node A, the unicast modulation method discriminating unit 55 selects the communication quality according to the node having the lowest quality among all the adjacent nodes.
In the example of FIG. 7, the SNR (Signal to Noise Ratio) in the communication with the node B is 12 dB, the SNR of the node E is 16 dB, but the SNR of the node D unrelated to the multicast communication is 12 dB. It is 8.3 dB.
　そのため、従来の通信装置では、ノードＡは、最もＳＮＲが低いノードＤに合わせてＢＰＳＫ（Binary Phase Shift Keying）変調方式を選択し、ＢＰＳＫでマルチキャスト通信を行う。
　つまり、必要以上に伝送速度の遅い方式を選択することになる。 Therefore, in the conventional communication device, the node A selects the BPSK (Binary Phase Shift Keying) modulation method according to the node D having the lowest SNR, and performs multicast communication by the BPSK.
In other words, a method with a slower transmission speed than necessary will be selected.
　これは、従来の通信装置では、変調方式の選択をＬ２（データリンク層）である無線アクセス制御部５０で行っており、どのノードが中継ノードや受信ノードなのかを判別することができず、エリア内の全てのノードとの通信における通信品質に基づいて処理を行うためである。 In the conventional communication device, the modulation method is selected by the wireless access control unit 50 which is L2 (data link layer), and it is not possible to determine which node is the relay node or the receiving node. This is because processing is performed based on the communication quality in communication with all the nodes in the area.
　そして、適切な変調方式が選択されない場合には、無線回線を用いたネットワーク接続や、ネットワーク接続での情報共有等の伝送遅延が発生し、最悪の場合には伝送できなくなるといった著しい通信品質の低下につながる恐れがある。 If an appropriate modulation method is not selected, transmission delays such as network connection using wireless lines and information sharing over network connections will occur, and in the worst case, transmission will not be possible, resulting in a significant deterioration in communication quality. May lead to.
［関連技術］
　通信装置に関する従来技術としては、特許第５４６５３２８号公報「無線通信装置および無線通信方法」（特許文献１）、特許第５６５８９５４号公報「無線通信装置」（特許文献２）がある。 [Related technology]
As a prior art relating to a communication device, there are Japanese Patent No. 5465328 “Wireless Communication Device and Wireless Communication Method” (Patent Document 1) and Japanese Patent No. 5658954 “Wireless Communication Device” (Patent Document 2).
　特許文献１には、相互に接続された有線ネットワークと無線ネットワークの両方に対応したマルチキャスト送信が可能な無線通信装置が記載されている。
　特許文献２には、適応変調符号化方式において、効果的に変調方式及び符号化率を選択することができる無線通信装置が記載されている。 Patent Document 1 describes a wireless communication device capable of multicast transmission corresponding to both a wired network and a wireless network connected to each other.
Patent Document 2 describes a wireless communication device capable of effectively selecting a modulation method and a coding rate in an adaptive modulation coding method.
特許第５４６５３２８号公報Japanese Patent No. 5465328 特許第５６５８９５４号公報Japanese Patent No. 5658954
　上述したように、従来の通信装置では、Ｌ２である無線アクセス制御部で変調方式を選択していたため、マルチキャスト通信の経路上にあって実際に受信待ちを行う通信局が識別できず、制御用の通信やユニキャスト通信を行う通信局も含めた通信品質を反映させていたため、適切な変調方式を選択することが困難であり、通信品質の低下を招く恐れがあるという問題点があった。 As described above, in the conventional communication device, since the modulation method is selected by the wireless access control unit which is L2, the communication station which is on the multicast communication path and actually waits for reception cannot be identified, and is used for control. Since it reflects the communication quality including the communication stations that perform communication and unicast communication, it is difficult to select an appropriate modulation method, and there is a problem that the communication quality may deteriorate.
　尚、特許文献１及び２には、マルチキャスト通信において、経路上にある通信局の通信品質を対象とし、それ以外の通信局の影響を除いて適切な変調方式を選択することは記載されていない。 It should be noted that Patent Documents 1 and 2 do not describe that in multicast communication, the communication quality of a communication station on the route is targeted, and an appropriate modulation method is selected excluding the influence of other communication stations. ..
　本発明は上記実状に鑑みて為されたもので、マルチキャスト通信において実際に受信待ちを行う通信局を対象とし、それ以外の通信局の影響を除いて適切な変調方式を選択し、通信品質を確保することができる通信装置、通信方法及びプログラムを提供することを目的とする。 The present invention has been made in view of the above circumstances, and is intended for a communication station that actually waits for reception in multicast communication, and selects an appropriate modulation method excluding the influence of other communication stations to improve the communication quality. It is an object of the present invention to provide a communication device, a communication method and a program that can be secured.
　上記従来例の問題点を解決するための本発明は、アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置であって、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、ノード品質情報を参照して、マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、当該最低値に基づいて変調方式を選択するネットワーク部を有することを特徴としている。 The present invention for solving the problems of the above-mentioned conventional example is a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and the communication quality of a plurality of nodes acquired at the time of reception is the node quality. Stored as information, when transmitting multicast communication, refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. It is characterized by having a network unit that selects a modulation method based on the minimum value.
　また、本発明は、上記通信装置において、ネットワーク部が、受信したＭＡＣフレームの受信品質を、送信ノードのＭＡＣアドレス及びＩＰアドレスに対応付けてノード品質情報として記憶しておくと共に、ノード品質情報を参照して、入力されたＩＰアドレスリストに含まれるＩＰアドレスに対応する受信品質の最低値を出力する品質情報管理部と、マルチキャスト通信の送信時に、当該マルチキャスト通信のグループによって特定された経路上にあるノードのＩＰアドレスリストを取得し、ＩＰアドレスリストを品質情報管理部に出力して、品質情報管理部から入力された受信品質の最低値に応じて変調方式を選択するマルチキャスト変調方式判別部とを備えたことを特徴としている。 Further, in the above-mentioned communication device, in the above-mentioned communication device, the network unit stores the reception quality of the received MAC frame in association with the MAC address and the IP address of the transmitting node as node quality information, and also stores the node quality information. Refer to the quality information management unit that outputs the lowest value of the reception quality corresponding to the IP address included in the input IP address list, and when transmitting the multicast communication, on the route specified by the group of the multicast communication. A multicast modulation method discriminator that acquires the IP address list of a certain node, outputs the IP address list to the quality information management unit, and selects the modulation method according to the lowest value of the reception quality input from the quality information management unit. It is characterized by being equipped with.
　また、本発明は、上記通信装置において、受信品質が、等化誤差又は信号対雑音比であることを特徴としている。 Further, the present invention is characterized in that, in the above communication device, the reception quality is an equalization error or a signal-to-noise ratio.
　また、本発明は、上記通信装置において、ネットワーク部が、受信したアドホックメッセージのＭＡＣフレームからＩＰアドレスとＭＡＣアドレスとの組み合わせを取得してＩＰアドレス－ＭＡＣアドレステーブルを生成するＩＰアドレス－ＭＡＣアドレステーブル保持部を備え、品質情報管理部が、ＩＰアドレス－ＭＡＣアドレステーブルを参照してノード品質情報を生成することを特徴としている。 Further, according to the present invention, in the above communication device, the network unit acquires a combination of an IP address and a MAC address from the MAC frame of the received ad hoc message and generates an IP address-MAC address table. IP address-MAC address table. It is characterized in that it is provided with a holding unit, and the quality information management unit generates node quality information by referring to an IP address-MAC address table.
　また、本発明は、アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置における通信方法であって、通信装置が、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、ノード品質情報を参照して、マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、当該最低値に基づいて変調方式を選択することを特徴としている。 Further, the present invention is a communication method in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and the communication quality of a plurality of nodes acquired by the communication device at the time of reception is used as node quality information. Remember, when transmitting multicast communication, refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. It is characterized by selecting the modulation method based on the lowest value.
　また、本発明は、アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置において動作するプログラムであって、通信装置を、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、ノード品質情報を参照して、マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、当該最低値に基づいて変調方式を選択するよう機能させることを特徴としている。 Further, the present invention is a program that operates in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and provides node quality information on the communication quality of a plurality of nodes acquired at the time of receiving the communication device. When transmitting multicast communication, refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. It is characterized in that it functions to select a modulation method based on the minimum value.
　本発明によれば、アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置であって、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、ノード品質情報を参照して、マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、当該最低値に基づいて変調方式を選択するネットワーク部を有する通信装置としているので、マルチキャスト通信経路上の通信局を識別して、実際に経路上にある通信局を対象として適切な変調方式を選択することができ、経路上にない通信局の影響を防ぎ、良好な通信品質を確保することができる効果がある。 According to the present invention, it is a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and stores the communication quality of a plurality of nodes acquired at the time of reception as node quality information, and performs multicast communication. At the time of transmission, the node quality information is referred to to determine the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group, and the modulation method is based on the lowest value. Since the communication device has a network unit for selecting, it is possible to identify the communication station on the multicast communication path and select an appropriate modulation method for the communication station actually on the path. It has the effect of preventing the influence of no communication station and ensuring good communication quality.
　また、本発明によれば、アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置における通信方法であって、通信装置が、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、ノード品質情報を参照して、マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、当該最低値に基づいて変調方式を選択する通信方法としているので、マルチキャスト通信経路上の通信局を識別して、実際に経路上にある通信局を対象として適切な変調方式を選択することができ、経路上にない通信局の影響を防ぎ、良好な通信品質を確保することができる効果がある。 Further, according to the present invention, it is a communication method in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and the communication quality of a plurality of nodes acquired by the communication device at the time of reception is node quality. Stored as information, when transmitting multicast communication, refer to the node quality information to find the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. Since the communication method is to select the modulation method based on the minimum value, it is possible to identify the communication station on the multicast communication path and select the appropriate modulation method for the communication station actually on the path. This has the effect of preventing the influence of communication stations that are not on the route and ensuring good communication quality.
　また、本発明によれば、アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置において動作するプログラムであって、通信装置を、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、ノード品質情報を参照して、マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、当該最低値に基づいて変調方式を選択するよう機能させるプログラムとしているので、マルチキャスト通信経路上の通信局を識別して、実際に経路上にある通信局を対象として適切な変調方式を選択することができ、経路上にない通信局の影響を防ぎ、良好な通信品質を確保することができる効果がある。 Further, according to the present invention, it is a program that operates in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication, and determines the communication quality of a plurality of nodes acquired at the time of receiving the communication device. Stored as quality information, when transmitting multicast communication, refer to the node quality information and select the lowest quality communication quality corresponding to the node on the route specified by the multicast communication group. Since it is a program that functions to select the modulation method based on the minimum value, it identifies the communication station on the multicast communication path and selects the appropriate modulation method for the communication station actually on the path. This has the effect of preventing the influence of communication stations that are not on the route and ensuring good communication quality.
本通信装置の構成ブロック図である。It is a block diagram of the structure of this communication device. 本通信装置の動作概要を示す説明図である。It is explanatory drawing which shows the operation outline of this communication apparatus. マルチキャストグループ情報の構成を示す説明図である。It is explanatory drawing which shows the structure of the multicast group information. 本通信装置における周波数選択のシーケンスを示す説明図である。It is explanatory drawing which shows the sequence of frequency selection in this communication apparatus. 変調方式選択テーブルの説明図である。It is explanatory drawing of the modulation method selection table. 従来の通信装置の構成ブロック図である。It is a block diagram of the structure of the conventional communication device. 従来のマルチキャスト通信における適応変調を示す説明図である。It is explanatory drawing which shows the adaptive modulation in the conventional multicast communication.
　本発明の実施の形態について図面を参照しながら説明する。
［実施の形態の概要］
　本発明の実施の形態に係る通信装置（本通信装置）は、マルチキャスト通信を行う通信装置であって、ネットワーク部において、受信時に、受信品質をノードのＩＰアドレスに対応してノード品質情報として記憶しておき、マルチキャスト通信の送信時に、ノード品質情報を参照して、当該マルチキャスト通信のグループによって特定される経路上にあるノードのＩＰアドレスに対応する通信品質の内、品質が最も低い最低値を求め、当該最低値に基づいて変調方式を選択するようにしており、実際のマルチキャスト通信経路上の通信局を対象として適切な変調方式を選択することができ、経路上にない通信局の影響を除外して、良好な通信品質を確保することができるものである。 An embodiment of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
The communication device (the present communication device) according to the embodiment of the present invention is a communication device that performs multicast communication, and stores the reception quality as node quality information corresponding to the IP address of the node at the time of reception in the network unit. In addition, when transmitting multicast communication, refer to the node quality information and select the lowest quality communication quality corresponding to the IP address of the node on the route specified by the multicast communication group. The modulation method is selected based on the minimum value, and an appropriate modulation method can be selected for the communication station on the actual multicast communication path, and the influence of the communication station not on the path can be selected. By excluding it, good communication quality can be ensured.
　また、本通信方法は、本通信装置における通信方法であり、本プログラムは、本通信装置において動作するプログラムである。 Further, this communication method is a communication method in this communication device, and this program is a program that operates in this communication device.
[本通信装置の構成：図１]
　本通信装置の構成について図１を用いて説明する。図１は、本通信装置の構成ブロック図である。
　図１に示すように、本通信装置の基本的な構成は、従来と同様であり、ネットワーク部１０と、無線アクセス制御部（ＭＡＣ部）２０と、無線信号処理／高周波部３０とを備えている。
　無線信号処理／高周波部３０は、図６に示した従来の無線信号処理／高周波部６０と同等であり、詳細な説明は省略する。 [Configuration of this communication device: Fig. 1]
The configuration of this communication device will be described with reference to FIG. FIG. 1 is a block diagram of the configuration of this communication device.
As shown in FIG. 1, the basic configuration of this communication device is the same as the conventional one, and includes a network unit 10, a wireless access control unit (MAC unit) 20, and a wireless signal processing / high frequency unit 30. There is.
The radio signal processing / high frequency unit 30 is the same as the conventional radio signal processing / high frequency unit 60 shown in FIG. 6, and detailed description thereof will be omitted.
　従来の通信装置では、マルチキャスト通信における送信時の変調方式の選択をＬ２である無線アクセス制御部５０で行っていたが、本通信装置では、Ｌ３であるネットワーク部１０で行うようにしている。
　これにより、本通信装置では、エリア内にある通信局の中から、経路上にある通信局を識別して、これらの通信局との通信における品質に基づいて適切な変調方式を選択できるものである。 In the conventional communication device, the selection of the modulation method at the time of transmission in the multicast communication is performed by the wireless access control unit 50 which is L2, but in this communication device, it is performed by the network unit 10 which is L3.
As a result, this communication device can identify the communication stations on the path from the communication stations in the area and select an appropriate modulation method based on the quality of communication with these communication stations. be.
[本通信装置の動作概要：図２]
　本通信装置の各部について説明する前に、本通信装置の動作概要について図２を用いて説明する。図２は、本通信装置の動作概要を示す説明図である。
　図２に示したネットワークは、図７に示したものと同等であり、マルチキャスト通信でノードＡからノードＣ，Ｆにデータを送信する場合を想定している。ノードＡ（本通信装置）と各隣接ノード間の通信品質（ＳＮＲ）は、図７と同等である。 [Outline of operation of this communication device: Fig. 2]
Before explaining each part of the communication device, an outline of the operation of the communication device will be described with reference to FIG. FIG. 2 is an explanatory diagram showing an outline of operation of the communication device.
The network shown in FIG. 2 is the same as that shown in FIG. 7, and it is assumed that data is transmitted from node A to nodes C and F by multicast communication. The communication quality (SNR) between the node A (this communication device) and each adjacent node is the same as that in FIG. 7.
　ここで、本通信装置（ノードＡ）では、エリア内のノードの中から、実際のマルチキャスト通信の経路上にあるノードＢとノードＥを判別して、これらのノードとの通信での通信品質に基づいて変調方式を選択する。
　つまり、ノードＤは無線リンクを維持するための通信は行っているものの、当該マルチキャスト通信の経路上にはないため、ノードＡは、当該マルチキャスト通信の変調方式を決定する際に、ノードＤの通信品質は反映されない。即ち、マルチキャスト通信の経路上にあるノードの通信品質に基づいてマルチキャスト通信の変調方式を決定するものである。 Here, in this communication device (node A), the node B and the node E on the actual multicast communication route are discriminated from the nodes in the area, and the communication quality in the communication with these nodes is determined. Select the modulation method based on.
That is, although the node D is performing communication for maintaining the wireless link, it is not on the path of the multicast communication. Therefore, the node A communicates with the node D when determining the modulation method of the multicast communication. Quality is not reflected. That is, the modulation method of the multicast communication is determined based on the communication quality of the nodes on the multicast communication path.
　その結果、ＳＮＲの最低値は１２dBとなり、ノードＡは、当該マルチキャスト通信の送信では、ＱＰＳＫ（Quadrature Phase Shift Keying）を選択する。これにより、図７に示した従来の通信装置で選択されたＢＰＳＫに比べて伝送速度を増大させ、スループットの向上や伝送時の低遅延化を図ることができるものである。
　本通信装置では、通信品質と変調方式を対応付けた情報（変調方式選択テーブル）に基づいて変調方式を選択する。変調方式選択テーブルについては後述する。 As a result, the minimum value of SNR becomes 12 dB, and the node A selects QPSK (Quadrature Phase Shift Keying) for the transmission of the multicast communication. As a result, the transmission speed can be increased as compared with the BPSK selected in the conventional communication device shown in FIG. 7, the throughput can be improved, and the delay during transmission can be reduced.
In this communication device, the modulation method is selected based on the information (modulation method selection table) in which the communication quality and the modulation method are associated with each other. The modulation method selection table will be described later.
　尚、プリアンブルはＢＰＳＫであるため、ノードＤもこれを受信してキャリアセンスを行い、ＰＬＣＰ（Physical Layer Convergence Protocol）フレームに従って送信待機、又は他の通信局が通信を行っているＢｕｓｙ状態で送信待機することにより、信号の衝突を回避することができるものである。 Since the preamble is BPSK, node D also receives this and performs carrier sense, and waits for transmission according to the PLCP (Physical Layer Convergence Protocol) frame, or waits for transmission in the Busy state where another communication station is communicating. By doing so, it is possible to avoid signal collision.
［ネットワーク部１０］
　図１に戻って本通信装置の構成について説明する。
　ネットワーク部１０は、ＣＰＵ等の制御部と記憶部とインタフェース部とを備えており、記憶部に記憶されたプログラムを制御部が起動することによって各種機能を実現するものである。
　ネットワーク部１０は、具体的な機能を実現する各部として、アドホックマルチキャストルーティング部１１と、フレーム生成／解析部１２と、ＩＰアドレス－ＭＡＣアドレステーブル保持部１３と、品質情報管理部１４と、マルチキャスト変調方式判別部１５とを備えている。 [Network unit 10]
Returning to FIG. 1, the configuration of this communication device will be described.
The network unit 10 includes a control unit such as a CPU, a storage unit, and an interface unit, and the control unit activates a program stored in the storage unit to realize various functions.
The network unit 10 has an ad hoc multicast routing unit 11, a frame generation / analysis unit 12, an IP address-MAC address table holding unit 13, a quality information management unit 14, and a multicast modulation as each unit that realizes specific functions. It is provided with a method determination unit 15.
　[アドホックマルチキャストルーティング部１１]
　アドホックマルチキャストルーティング部１１は、従来と同様にアドホックマルチキャスト通信のルーティング制御を行うものであり、マルチキャスト通信の送信元ＩＰアドレスと宛先ＩＰアドレス（マルチキャストグループアドレス）と、受信局及び中継局の情報を示す子ノードＩＰアドレスリストの組み合わせを管理している。
　そして、マルチキャスト送信時に、マルチキャストグループに対応する最適な経路を決定して、子ノードＩＰアドレスリストを生成する。 [Ad hoc multicast routing unit 11]
The ad hoc multicast routing unit 11 controls the routing of the ad hoc multicast communication as in the conventional case, and shows the source IP address and the destination IP address (multicast group address) of the multicast communication, and the information of the receiving station and the relay station. It manages the combination of child node IP address lists.
Then, at the time of multicast transmission, the optimum route corresponding to the multicast group is determined, and a child node IP address list is generated.
　送信元ＩＰアドレスと宛先ＩＰアドレス（マルチキャストグループアドレス）の組み合わせをマルチキャスト参加エントリと称する。
　また、マルチキャスト参加エントリと子ノードＩＰアドレスリストの組み合わせを、マルチキャストグループ情報と称するものとする。
　図では１個しか示していないが、アドホックマルチキャストルーティング部１１には複数のマルチキャストグループ情報が記憶されていてもよい。マルチキャストグループ情報については後述する。 The combination of the source IP address and the destination IP address (multicast group address) is called a multicast participation entry.
Further, the combination of the multicast participation entry and the child node IP address list is referred to as multicast group information.
Although only one is shown in the figure, a plurality of multicast group information may be stored in the ad hoc multicast routing unit 11. The multicast group information will be described later.
　そして、本通信装置のアドホックマルチキャストルーティング部１１は、後述するマルチキャスト変調方式判別部１５からの要求に基づいて、宛先となるマルチキャストグループに対応する子ノードＩＰアドレスリストを出力する。 Then, the ad hoc multicast routing unit 11 of this communication device outputs a child node IP address list corresponding to the destination multicast group based on the request from the multicast modulation method determination unit 15 described later.
　[フレーム生成／解析部１２]
　フレーム生成／解析部１２は、従来と同様に、送信すべきＩＰパケットやアドホックメッセージのＭＡＣフレームを生成し、受信したＭＡＣフレームからＩＰパケットやアドホックメッセージを抽出する。
　そして、本通信装置の特徴として、フレーム生成／解析部１２は、マルチキャスト通信で送信されるＩＰパケット（マルチキャストパケットと称する）が入力されると、送信元ＩＰアドレスと宛先ＩＰアドレスの組み合わせをマルチキャスト変調方式判別部１５に出力して、変調方式の指定を受ける。 [Frame generation / analysis unit 12]
The frame generation / analysis unit 12 generates a MAC frame of an IP packet or an ad hoc message to be transmitted as in the conventional case, and extracts an IP packet or an ad hoc message from the received MAC frame.
Then, as a feature of this communication device, when an IP packet (referred to as a multicast packet) transmitted by multicast communication is input, the frame generation / analysis unit 12 multicast-modulates the combination of the source IP address and the destination IP address. It is output to the method discriminating unit 15 to receive the designation of the modulation method.
　更に、本通信装置のフレーム生成／解析部１２は、マルチキャスト変調方式判別部１５から指定された変調方式を、送信するＭＡＣフレームに付して無線アクセス制御部２０に出力する。 Further, the frame generation / analysis unit 12 of this communication device attaches the modulation method specified by the multicast modulation method determination unit 15 to the MAC frame to be transmitted and outputs the modulation method to the wireless access control unit 20.
　[ＩＰアドレス－ＭＡＣアドレステーブル保持部１３]
　ＩＰアドレス－ＭＡＣアドレステーブル保持部１３は、受信したＭＡＣフレームに含まれるアドホックルーティングメッセージから、送信元のＩＰアドレスとＭＡＣアドレスの組み合わせを取得して、ＩＰアドレス－ＭＡＣアドレステーブルを生成して記憶する。 [IP address-MAC address table holding unit 13]
The IP address-MAC address table holding unit 13 acquires a combination of the source IP address and the MAC address from the ad hoc routing message included in the received MAC frame, and generates and stores the IP address-MAC address table. ..
　[品質情報管理部１４]
　品質情報管理部１４は、受信したＭＡＣフレームに基づいて、ノード毎の通信品質を求めて記憶しておき、マルチキャスト送信時に、宛先となる子ノードの通信品質の内、最低品質の値を出力するものである。
　受信品質を取得する際には、アドホックメッセージだけでなくユニキャスト通信を用いてもよい。 [Quality Information Management Department 14]
The quality information management unit 14 obtains and stores the communication quality of each node based on the received MAC frame, and outputs the lowest quality value among the communication qualities of the destination child node at the time of multicast transmission. It is a thing.
When acquiring the reception quality, not only the ad hoc message but also the unicast communication may be used.
　具体的には、品質情報管理部１４は、無線アクセス制御部２０から、受信ＭＡＣフレーム及び通信品質情報（等化誤差等）を入力して、ノード（受信ＭＡＣフレームにおける送信ノード）毎に、ノードＭＡＣアドレスと、それに対応するノードＩＰアドレスと、等化誤差情報又は等化誤差から算出したＳＮＲ情報を組として記憶する。この情報をノード品質情報と称する。 Specifically, the quality information management unit 14 inputs a received MAC frame and communication quality information (equalization error, etc.) from the wireless access control unit 20, and node for each node (transmission node in the received MAC frame). The MAC address, the corresponding node IP address, and the equalization error information or the SNR information calculated from the equalization error are stored as a set. This information is called node quality information.
　ここで、品質情報管理部１４は、ＩＰアドレス－ＭＡＣアドレステーブルを参照して、ノードＭＡＣアドレスに対応するノードＩＰアドレスを特定する。
　つまり、品質情報管理部１４は、本通信装置でアドホックメッセージの受信が行われる度に、ノード品質情報を蓄積（更新）していく。
　ノード品質情報には、マルチキャスト通信で子ノードとなるか否か（マルチキャスト通信の経路上にあるかどうか）に関わらず、当該通信装置と通信を行う全てのノードの通信品質情報が蓄積されるものである。 Here, the quality information management unit 14 refers to the IP address-MAC address table and specifies the node IP address corresponding to the node MAC address.
That is, the quality information management unit 14 accumulates (updates) node quality information each time an ad hoc message is received by the communication device.
The node quality information stores the communication quality information of all the nodes communicating with the communication device regardless of whether or not it becomes a child node in multicast communication (whether or not it is on the route of multicast communication). Is.
　そして、品質情報管理部１４は、マルチキャスト変調方式判別部１５から子ノードＩＰアドレスリストが入力されると、ノード品質情報を参照して、入力された子ノードＩＰアドレスリストに含まれるノードＩＰアドレスに対応する品質情報（ここではＳＮＲ情報とする）を特定する。
　更に、品質情報管理部１４は、特定された品質情報の中から、最も低い（最も品質が悪い）値を特定し、マルチキャスト変調方式判別部１５に出力する。 Then, when the child node IP address list is input from the multicast modulation method determination unit 15, the quality information management unit 14 refers to the node quality information and sets the node IP address included in the input child node IP address list. The corresponding quality information (here, SNR information) is specified.
Further, the quality information management unit 14 identifies the lowest (worst quality) value from the specified quality information and outputs it to the multicast modulation method determination unit 15.
　[マルチキャスト変調方式判別部１５]
　マルチキャスト変調方式判別部１５は、マルチキャスト送信時に、宛先又は中継局となる子ノードとの通信品質に応じた適切な変調方式を選択して、フレーム生成／解析部１２に指定するものである。 [Multicast modulation method discriminating unit 15]
At the time of multicast transmission, the multicast modulation method determination unit 15 selects an appropriate modulation method according to the communication quality with the child node serving as the destination or relay station, and designates it to the frame generation / analysis unit 12.
　具体的には、マルチキャスト変調方式判別部１５は、フレーム生成／解析部１２から送信元アドレス及び宛先ＩＰアドレスの組み合わせが入力されると、当該送信元アドレス及び宛先ＩＰアドレスに基づいて、アドホックマルチキャストルーティング部１１に子ノードＩＰアドレスリストを要求する。
　これにより、マルチキャスト変調方式判別部１５は、これから送信するデータの送信先となるグループアドレスに対応した子ノードＩＰアドレスリストを取得するものである。つまり、子ノードＩＰアドレスリストに含まれるＩＰアドレスは、当該マルチキャスト通信の経路上にあるノードのＩＰアドレスである。 Specifically, when the combination of the source address and the destination IP address is input from the frame generation / analysis unit 12, the multicast modulation method discriminating unit 15 performs ad hoc multicast routing based on the source address and the destination IP address. Request the child node IP address list from the unit 11.
As a result, the multicast modulation method determination unit 15 acquires a child node IP address list corresponding to the group address to which the data to be transmitted is transmitted. That is, the IP address included in the child node IP address list is the IP address of the node on the route of the multicast communication.
　更に、マルチキャスト変調方式判別部１５は、取得した子ノードＩＰアドレスリストを品質情報管理部１４に出力し、それに対応する品質情報の最低値を取得する。
　そして、品質情報の最低値に基づいて、内部に記憶している変調方式選択テーブルを参照して、変調方式を選択し、フレーム生成／解析部１２に出力する。 Further, the multicast modulation method determination unit 15 outputs the acquired child node IP address list to the quality information management unit 14, and acquires the minimum value of the corresponding quality information.
Then, based on the lowest value of the quality information, the modulation method is selected by referring to the modulation method selection table stored internally, and the modulation method is selected and output to the frame generation / analysis unit 12.
　また、ここでは図示は省略するが、本通信装置のネットワーク部１０では、マルチキャスト通信に限らず、ユニキャスト通信時にも同様に変調方式を選択することが可能である。
　この場合、ユニキャスト通信時に、フレーム生成／解析部１２が、マルチキャスト変調方式判別部１５に、アドホックメッセージから抽出した送信元ＩＰアドレスと宛先ＭＡＣアドレスを出力する。 Further, although not shown here, the network unit 10 of this communication device can similarly select a modulation method not only for multicast communication but also for unicast communication.
In this case, during unicast communication, the frame generation / analysis unit 12 outputs the source IP address and the destination MAC address extracted from the ad hoc message to the multicast modulation method determination unit 15.
　マルチキャスト変調方式判別部１５は、当該宛先ＭＡＣアドレスを付して品質情報管理部１４に変調方式を問い合わせ、品質情報管理部１４が当該宛先ＭＡＣアドレスに対応する品質情報をマルチキャスト変調方式判別部１５に出力する。
　マルチキャスト変調方式判別部１５では、入力された品質情報に基づいて変調方式を特定し、フレーム生成／解析部１２に出力する。
　このようにして、ユニキャスト通信における変調方式も通信品質に基づいて適切に選択できるものである。 The multicast modulation method discriminating unit 15 attaches the destination MAC address and inquires the quality information management unit 14 about the modulation method, and the quality information management unit 14 sends the quality information corresponding to the destination MAC address to the multicast modulation method discriminating unit 15. Output.
The multicast modulation method determination unit 15 identifies the modulation method based on the input quality information and outputs it to the frame generation / analysis unit 12.
In this way, the modulation method in unicast communication can also be appropriately selected based on the communication quality.
　本通信装置では、無線アクセス制御部２０の構成は従来と同様であるが、ネットワーク部１０から入力されるＭＡＣフレームは既に変調方式が指定されているため、ユニキャスト変調方式判別部２５で選択された変調方式は採用されないように設定されている。 In this communication device, the configuration of the wireless access control unit 20 is the same as the conventional one, but since the modulation method has already been specified for the MAC frame input from the network unit 10, it is selected by the unicast modulation method determination unit 25. The modulation method is set not to be adopted.
[マルチキャストグループ情報：図３]
　ここで、マルチキャストグループ情報の構成について図３を用いて説明する。図３は、マルチキャストグループ情報の構成を示す説明図である。
　図３に示すように、マルチキャストグループ情報は、送信元（自装置）ＩＰアドレス７１と、宛先ＩＰアドレス７２と、複数の子ノードＩＰアドレス７３-1～７３-nが連結された構成である。 [Multicast group information: Fig. 3]
Here, the configuration of the multicast group information will be described with reference to FIG. FIG. 3 is an explanatory diagram showing the configuration of multicast group information.
As shown in FIG. 3, the multicast group information has a configuration in which a source (own device) IP address 71, a destination IP address 72, and a plurality of child node IP addresses 73-1 to 73-n are concatenated.
　宛先ＩＰアドレスは、マルチキャスト通信のグループを特定するグループアドレスであり、当該グループに属する受信ノードが特定されるものである。そして、送信元ＩＰアドレスと宛先ＩＰアドレスの組み合わせがマルチキャスト参加エントリとなっている。
　子ノードＩＰアドレスリストは、複数の子ノードＩＰアドレス７３-1～７３-2が連結されたリストである。当該マルチキャスト通信においては、これらの複数の子ノードを通る適切な経路が決定されるため、複数の子ノードアドレスは当該経路上にあり、当該装置からの送信信号を待ち受ける受信局又は中継局となる子ノードのアドレスである。 The destination IP address is a group address that specifies a group of multicast communication, and a receiving node that belongs to the group is specified. The combination of the source IP address and the destination IP address is the multicast participation entry.
The child node IP address list is a list in which a plurality of child node IP addresses 73-1 to 73-2 are concatenated. In the multicast communication, an appropriate route passing through these plurality of child nodes is determined, so that the plurality of child node addresses are on the route and become a receiving station or a relay station waiting for a transmission signal from the device. The address of the child node.
[本通信装置におけるシーケンス：図４]
　次に、本通信装置における周波数選択のシーケンスについて図４を用いて説明する。図４は、本通信装置における周波数選択のシーケンスを示す説明図である。
　図４に示すように、受信された高周波信号が無線信号処理／高周波部３０に入力されると（Ｓ１１）、無線信号処理／高周波部３０は、ベースバンド信号にダウンコンバートして復調し、ＭＡＣフレームを無線アクセス制御部２０に出力する（Ｓ１２）。
　また、その際に無線信号処理／高周波部３０は、等化誤差等の品質情報を算出して、品質情報を無線アクセス制御部２０に出力する（Ｓ１３）。 [Sequence in this communication device: Fig. 4]
Next, the sequence of frequency selection in this communication device will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a frequency selection sequence in the communication device.
As shown in FIG. 4, when the received high-frequency signal is input to the radio signal processing / high-frequency unit 30 (S11), the radio signal processing / high-frequency unit 30 down-converts to a baseband signal, demolishes it, and performs MAC. The frame is output to the radio access control unit 20 (S12).
At that time, the wireless signal processing / high frequency unit 30 calculates quality information such as equalization error and outputs the quality information to the wireless access control unit 20 (S13).
　無線アクセス制御部２０は、ＭＡＣフレームをネットワーク部１０のフレーム生成／解析部１２に出力する（Ｓ１４）。
　更に、本通信装置の特徴として、無線アクセス制御部２０は、ＭＡＣフレームをＩＰアドレス－ＭＡＣアドレステーブル保持部１３及び品質情報管理部１４に出力し（Ｓ１５，Ｓ１６）、等化誤差等の品質情報を品質情報管理部１４に出力する（Ｓ１７）。 The wireless access control unit 20 outputs the MAC frame to the frame generation / analysis unit 12 of the network unit 10 (S14).
Further, as a feature of this communication device, the wireless access control unit 20 outputs a MAC frame to the IP address-MAC address table holding unit 13 and the quality information management unit 14 (S15, S16), and quality information such as equalization error. Is output to the quality information management unit 14 (S17).
　フレーム生成／解析部１２は、ＭＡＣフレームを解析してアドホックメッセージをアドホックマルチキャストルーティング部１１に出力し、ＩＰパケットを表示処理部、音声出力部等に適宜出力する（Ｓ１８）。 The frame generation / analysis unit 12 analyzes the MAC frame, outputs an ad hoc message to the ad hoc multicast routing unit 11, and appropriately outputs an IP packet to a display processing unit, a voice output unit, and the like (S18).
　ＩＰアドレス－ＭＡＣアドレステーブル保持部１３は、入力されたＭＡＣフレームのアドホックメッセージからＩＰアドレスとＭＡＣアドレスの対応情報を取得して、ＩＰアドレス－ＭＡＣアドレステーブルに登録する。 The IP address-MAC address table holding unit 13 acquires the correspondence information between the IP address and the MAC address from the ad hoc message of the input MAC frame and registers it in the IP address-MAC address table.
　また、品質情報管理部１４は、入力された等化誤差等の品質情報からＳＮＲを算出し、共に入力されたＭＡＣフレームに含まれるＭＡＣアドレス及びアドホックメッセージに含まれるＩＰアドレスを組み合わせて、ノード品質情報として記憶する。
　品質情報管理部１４は、本通信装置で受信が行われる度にこの処理を行って、ノード品質情報を蓄積、更新していく。同一ノードから複数回受信した場合には、最新の値が記憶される。 Further, the quality information management unit 14 calculates the SNR from the input quality information such as the equalization error, and combines the MAC address included in the MAC frame and the IP address included in the ad hoc message input together to form the node quality. Store as information.
The quality information management unit 14 performs this process every time reception is performed by the communication device, and accumulates and updates node quality information. If it is received multiple times from the same node, the latest value is stored.
　一方、送信時には、フレーム生成／解析部１２にマルチキャスト通信のＩＰパケットが入力されると（Ｓ２１）、フレーム生成／解析部１２は、当該マルチキャストグループに対応する宛先ＩＰアドレス（マルチキャストグループアドレス）を抽出し、送信元アドレス・宛先ＩＰアドレスをマルチキャスト変調方式判別部１５に出力する（Ｓ２２）。 On the other hand, at the time of transmission, when an IP packet for multicast communication is input to the frame generation / analysis unit 12 (S21), the frame generation / analysis unit 12 extracts the destination IP address (multicast group address) corresponding to the multicast group. Then, the source address and the destination IP address are output to the multicast modulation method determination unit 15 (S22).
　マルチキャスト変調方式判別部１５は、送信元アドレス・宛先ＩＰアドレスをアドホックマルチキャストルーティング部１１に出力して、当該マルチキャスト通信で、自装置からの送信を待ち受けるノードを特定するマルチキャスト受信子ノードＩＰアドレスリスト（子ノードＩＰアドレスリスト）を要求する（Ｓ２３）。
　そして、マルチキャスト変調方式判別部１５は、アドホックマルチキャストルーティング部１１から子ノードＩＰアドレスリストを受け取って（Ｓ２４）、品質情報管理部１４に子ノードＩＰアドレスリストを送出する（Ｓ２５）。 The multicast modulation method determination unit 15 outputs the source address and destination IP address to the ad hoc multicast routing unit 11, and identifies the node waiting for transmission from its own device in the multicast communication. Multicast receiver node IP address list ( (Child node IP address list) is requested (S23).
Then, the multicast modulation method determination unit 15 receives the child node IP address list from the ad hoc multicast routing unit 11 (S24), and sends the child node IP address list to the quality information management unit 14 (S25).
　品質情報管理部１４は、記憶しているノード品質情報から、入力された子ノードＩＰアドレスリストに含まれるＩＰアドレスに対応した品質情報（ＳＮＲ）を読み出し、その中で最小のＳＮＲ値をマルチキャスト変調方式判別部１５に出力する（Ｓ２６）。 The quality information management unit 14 reads the quality information (SNR) corresponding to the IP address included in the input child node IP address list from the stored node quality information, and multicast-modulates the smallest SNR value in the quality information (SNR). Output to the method determination unit 15 (S26).
　最小のＳＮＲ値を受け取ったマルチキャスト変調方式判別部１５は、変調方式選択テーブルを参照して、当該ＳＮＲ値に対応する変調方式を選択して、フレーム生成／解析部１２に出力する（Ｓ２７）。 The multicast modulation method discriminating unit 15 that has received the minimum SNR value refers to the modulation method selection table, selects a modulation method corresponding to the SNR value, and outputs it to the frame generation / analysis unit 12 (S27).
　フレーム生成／解析部１２は、送信するマルチキャストパケットのＭＡＣフレームを無線アクセス制御部２０に出力する（Ｓ２８）と共に、当該ＭＡＣフレームの変調方式を指定する情報を無線アクセス制御部２０に出力する（Ｓ２９）。 The frame generation / analysis unit 12 outputs the MAC frame of the multicast packet to be transmitted to the wireless access control unit 20 (S28), and outputs information specifying the modulation method of the MAC frame to the wireless access control unit 20 (S29). ).
　無線アクセス制御部２０は、所定の送信タイミングになると、当該ＭＡＣフレーム及び変調方式の情報を無線信号処理／高周波部３０に出力し（Ｓ３１，Ｓ３２）、無線信号処理／高周波部３０が、指定された変調方式で変調し、高周波信号に変換して無線出力する（Ｓ３２）。
　このようにして本通信装置におけるシーケンスが行われるものである。 When the wireless access control unit 20 reaches a predetermined transmission timing, the information of the MAC frame and the modulation method is output to the wireless signal processing / high frequency unit 30 (S31, S32), and the wireless signal processing / high frequency unit 30 is designated. It is modulated by the modulation method, converted into a high frequency signal, and wirelessly output (S32).
In this way, the sequence in this communication device is performed.
[変調方式選択テーブル：図５]
　次に、マルチキャスト変調方式判別部１５に記憶されている変調方式選択テーブルについて図５を用いて説明する。図５は、変調方式選択テーブルの説明図である。
　図５に示すように、変調方式選択テーブルでは、項番ごとに、選択される変調方式と、それに対応するＳＮＲのしきい値が記憶されている。
　品質情報管理部１４から入力されたＳＮＲ値（最小値）が、各しきい値未満の場合に、対応する変調方式が選択される。 [Modulation method selection table: Fig. 5]
Next, the modulation method selection table stored in the multicast modulation method determination unit 15 will be described with reference to FIG. FIG. 5 is an explanatory diagram of a modulation method selection table.
As shown in FIG. 5, in the modulation method selection table, the selected modulation method and the corresponding SNR threshold value are stored for each item number.
When the SNR value (minimum value) input from the quality information management unit 14 is less than each threshold value, the corresponding modulation method is selected.
　例えば、ＳＮＲ値（最小値）が１０dB未満であればＢＰＳＫが選択され、１０dB以上１４dB未満であれば、ＱＰＳＫが選択される。また、ＳＮＲ値が１４dB以上２０dB未満であれば１６ＱＡＭが選択され、２０dB以上２６dB未満であれば６４ＱＡＭが選択される。 For example, if the SNR value (minimum value) is less than 10 dB, BPSK is selected, and if it is 10 dB or more and less than 14 dB, QPSK is selected. If the SNR value is 14 dB or more and less than 20 dB, 16QAM is selected, and if it is 20 dB or more and less than 26 dB, 64QAM is selected.
[実施の形態の効果]
　本通信装置、本通信方法及び本プログラムによれば、アドホックマルチキャストルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置において、ネットワーク部１０において、ＩＰアドレス－ＭＡＣアドレステーブル保持部１３が、アドホックルーティングメッセージの受信ＭＡＣフレームからＩＰアドレスとＭＡＣアドレスの組み合わせを抽出して記憶しておくと共に、品質情報管理部１４が、受信時の通信品質をＩＰアドレスに対応してノード通信品質として記憶しておき、マルチキャスト変調方式判別部１５が、マルチキャスト通信の送信時に、送信元ＩＰアドレスと宛先ＩＰアドレスの組み合わせに対応する中継ノード及び受信ノードである子ノードＩＰアドレスリストを品質情報管理部１４に出力し、品質情報管理部１４が、入力されたＩＰアドレスリストに対応する通信品質の最低値をマルチキャスト変調方式判別部１５に出力し、マルチキャスト変調方式判別部１５が、当該通信品質の最低値に対応する変調方式を選択する通信装置、通信方法及びプログラムとしているので、実際のマルチキャスト通信経路上の通信局を対象として適切な変調方式を選択することができ、経路上にない通信局の影響を除外して、良好な通信品質を確保することができる効果がある。 [Effect of embodiment]
According to this communication device, this communication method, and this program, in a communication device that constructs a network using an ad hoc multicast routing protocol and performs multicast communication, the IP address-MAC address table holding unit 13 is used in the network unit 10. The combination of the IP address and the MAC address is extracted and stored from the received MAC frame of the ad hoc routing message, and the quality information management unit 14 stores the communication quality at the time of reception as the node communication quality corresponding to the IP address. The multicast modulation method determination unit 15 outputs a child node IP address list, which is a relay node and a reception node, corresponding to the combination of the source IP address and the destination IP address to the quality information management unit 14 when transmitting the multicast communication. Then, the quality information management unit 14 outputs the lowest value of the communication quality corresponding to the input IP address list to the multicast modulation method discriminating unit 15, and the multicast modulation method discriminating unit 15 corresponds to the lowest value of the communication quality. Since the communication device, communication method, and program are used to select the modulation method to be used, an appropriate modulation method can be selected for the communication station on the actual multicast communication route, and the influence of the communication station not on the route is excluded. Therefore, there is an effect that good communication quality can be ensured.
　本発明は、マルチキャスト通信の経路上にあるノードの回線状態に合わせ、それ以外の通信局の影響を除いて変調方式を選択でき、通信誤りを防止して通信品質を確保することができる無線通信装置、無線通信方法及びプログラムに適している。この出願は、２０２０年５月１８日に出願された日本出願特願２０２０－０８６７２９を基礎として優先権の利益を主張するものであり、その開示の全てを引用によってここに取り込む。 INDUSTRIAL APPLICABILITY According to the present invention, a modulation method can be selected according to the line state of a node on the multicast communication path and the influence of other communication stations is excluded, communication error can be prevented, and communication quality can be ensured. Suitable for devices, wireless communication methods and programs. This application claims the benefit of priority on the basis of Japanese application Japanese Patent Application No. 2020-086729 filed on May 18, 2020, the entire disclosure of which is incorporated herein by reference.
　１０，４０…ネットワーク部、　１１，４１…アドホックマルチキャストルーティング部、　１２，４２…フレーム生成／解析部、　１３…ＩＰアドレス－ＭＡＣアドレステーブル保持部、　１４…品質情報管理部、　１５…マルチキャスト変調方式判別部、　２０，５０…無線アクセス制御部、　２１，５１…ＦＣＳ／送信タイミング設定部、　２２，５２…制御フレーム解析部、　２３，５３…送信タイミング制御部、　２４，５４…ＦＣＳ／送信タイミング解析部、　２５，５５…ユニキャスト変調方式判別部、　３０，６０…無線信号処理／高周波部、　７１…送信元ＩＰアドレス、　７２…宛先ＩＰアドレス、
　７３-1～７３-n…子ノードＩＰアドレス 10, 40 ... Network section, 11, 41 ... Ad hoc multicast routing section, 12, 42 ... Frame generation / analysis section, 13 ... IP address-MAC address table holding section, 14 ... Quality information management section, 15 ... Multicast modulation method discrimination Unit, 20, 50 ... Wireless access control unit, 21, 51 ... FCS / transmission timing setting unit, 22, 52 ... control frame analysis unit, 23, 53 ... transmission timing control unit, 24, 54 ... FCS / transmission timing analysis unit , 25, 55 ... Unicast modulation method discriminator, 30, 60 ... Radio signal processing / high frequency section, 71 ... Source IP address, 72 ... Destination IP address,
73-1 to 73-n ... Child node IP address

Claims (6)

  1. 　アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置であって、
    　受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、前記ノード品質情報を参照して、前記マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、前記最低値に基づいて変調方式を選択するネットワーク部を有することを特徴とする通信装置。     A communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication.
    The communication quality of a plurality of nodes acquired at the time of reception is stored as node quality information, and when the multicast communication is transmitted, the node quality information is referred to to the node on the route specified by the multicast communication group. A communication device comprising a network unit that obtains the lowest value among the corresponding communication qualities and selects a modulation method based on the lowest value.
  2. 　ネットワーク部が、
    　受信したＭＡＣフレームの受信品質を、送信ノードのＭＡＣアドレス及びＩＰアドレスに対応付けてノード品質情報として記憶しておくと共に、前記ノード品質情報を参照して、入力されたＩＰアドレスリストに含まれるＩＰアドレスに対応する受信品質の最低値を出力する品質情報管理部と、
    　マルチキャスト通信の送信時に、前記マルチキャスト通信のグループによって特定された経路上にあるノードのＩＰアドレスリストを取得し、前記ＩＰアドレスリストを前記品質情報管理部に出力して、前記品質情報管理部から入力された前記受信品質の最低値に応じて変調方式を選択するマルチキャスト変調方式判別部とを備えたことを特徴とする請求項１記載の通信装置。     The network part
    The reception quality of the received MAC frame is stored as node quality information in association with the MAC address and IP address of the transmitting node, and the IP included in the input IP address list with reference to the node quality information. The quality information management unit that outputs the lowest value of the reception quality corresponding to the address,
    At the time of transmission of multicast communication, the IP address list of the node on the route specified by the multicast communication group is acquired, the IP address list is output to the quality information management unit, and the IP address list is input from the quality information management unit. The communication device according to claim 1, further comprising a multicast modulation method discriminating unit that selects a modulation method according to the minimum value of the received reception quality.
  3. 　受信品質が、等化誤差又は信号対雑音比であることを特徴とする請求項１又は２記載の通信装置。 The communication device according to claim 1 or 2, wherein the reception quality is an equalization error or a signal-to-noise ratio.
  4. 　ネットワーク部が、
    　受信したアドホックメッセージのＭＡＣフレームからＩＰアドレスとＭＡＣアドレスとの組み合わせを取得してＩＰアドレス－ＭＡＣアドレステーブルを生成するＩＰアドレス－ＭＡＣアドレステーブル保持部を備え、
    　品質情報管理部が、前記ＩＰアドレス－ＭＡＣアドレステーブルを参照してノード品質情報を生成することを特徴とする請求項２又は３記載の通信装置。     The network part
    It is equipped with an IP address-MAC address table holder that acquires a combination of IP address and MAC address from the MAC frame of the received ad hoc message and generates an IP address-MAC address table.
    The communication device according to claim 2 or 3, wherein the quality information management unit generates node quality information with reference to the IP address-MAC address table.
  5. 　アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置における通信方法であって、
    　前記通信装置が、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、前記ノード品質情報を参照して、前記マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、前記最低値に基づいて変調方式を選択することを特徴とする通信方法。     It is a communication method in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication.
    The communication device stores the communication quality of a plurality of nodes acquired at the time of reception as node quality information, and at the time of transmitting the multicast communication, the route specified by the group of the multicast communication is referred to by referring to the node quality information. A communication method characterized in that the lowest value among the communication qualities corresponding to the upper nodes is obtained, and the modulation method is selected based on the lowest value.
  6. 　アドホックマルチルーティングプロトコルを用いてネットワークを構築し、マルチキャスト通信を行う通信装置において動作するプログラムであって、
    　前記通信装置を、受信時に取得した複数のノードの通信品質をノード品質情報として記憶しておき、マルチキャスト通信の送信時に、前記ノード品質情報を参照して、前記マルチキャスト通信のグループによって特定された経路上にあるノードに対応する通信品質の内、品質が最も低い最低値を求め、前記最低値に基づいて変調方式を選択するよう機能させることを特徴とするプログラム。     A program that operates in a communication device that constructs a network using an ad hoc multi-routing protocol and performs multicast communication.
    The communication device stores the communication quality of a plurality of nodes acquired at the time of reception as node quality information, and at the time of transmission of multicast communication, the route specified by the group of the multicast communication is referred to with reference to the node quality information. A program characterized by finding the lowest value of the communication quality corresponding to the upper node and making it function to select a modulation method based on the lowest value.
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