JP2014216993A - Radio communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication apparatus capable of developing a stable network.SOLUTION: The radio communication apparatus includes reception means, acquisition means and connection relation development means. The reception means receives a traffic from another radio apparatuses. The acquisition means acquires transmission information between the radio communication apparatus and the other radio apparatuses on the basis of the traffic. The connection relation development means develops a connection relation to at least one of the other radio apparatuses on the basis of the transmission information to form an autonomous distribution type wireless network.

Description

  The present embodiment relates to a wireless communication device that establishes a connection relationship with another wireless device.

  In recent years, a multi-hop wireless communication system that realizes communication between wireless communication devices that do not reach a direct radio wave by constructing a network with a plurality of wireless communication devices and relaying packets between adjacent wireless communication devices It is spreading. Various sensors are attached to the wireless communication device, and are used in, for example, a system (AMI system: Advanced Metering Infrastructure System) that collects and controls various information such as power, gas, and water usage.

  In such a network, it is necessary for each wireless communication device to autonomously determine a connection partner in order to flexibly cope with changes in installation environment and propagation environment, and to construct a stable network that is resistant to failures.

JP 2008-228176 A

  In order to construct a stable network, a radio communication device monitors the radio link quality between the radio communication device and another radio communication device and the radio link quality between the radio communication device and the radio base station. It is always necessary to build a connection relationship with the optimal connection partner. However, when there is a small amount of communication on the wireless link in the network or when there is a device that has not yet been communicated such as newly installed, the wireless communication device determines the optimum connection partner from a plurality of connection candidates. There is a risk that the network may become unstable by establishing a connection relationship with a connection partner that is not optimal and does not have sufficient information. Further, the network may be damaged by a communication failure that is latent in the surrounding propagation environment, such as an exposed terminal problem, a hidden terminal problem, or a shielding failure caused by a moving object.

  The present invention provides a wireless communication apparatus capable of constructing a stable network.

  According to the embodiment, the wireless communication apparatus includes a reception unit, an acquisition unit, and a connection relationship construction unit. The receiving means receives traffic from another wireless device. The acquisition unit acquires transmission information between the wireless communication device and another wireless device based on the traffic. The connection relationship construction means constructs a connection relationship with at least one of the other wireless devices based on the transmission information in order to form an autonomous distributed wireless network.

1 is an overall configuration diagram illustrating an example of a wireless communication system according to an embodiment. The block block diagram used as an example of the management apparatus which concerns on embodiment. The block block diagram which becomes an example of the aggregation apparatus which concerns on embodiment. 1 is a block diagram illustrating an example of a wireless communication apparatus according to an embodiment. The figure which shows an example of the quality information acquired with the radio | wireless communication apparatus which concerns on embodiment.

  Hereinafter, the present embodiment will be specifically described with reference to the drawings. FIG. 1 is a block diagram illustrating a schematic configuration of a wireless communication system according to the present embodiment. As an example, the wireless communication system includes a management device 101, an aggregation device (wireless base station) 102, and wireless communication devices 103 to 118. In the present specification, the aggregation device 102 and the wireless communication devices 103 to 118 may be collectively referred to or at least one of them may be referred to as a wireless device. Further, in this specification, in relation to an arbitrary wireless communication device, at least one of wireless devices other than the arbitrary wireless communication device may be referred to as another wireless device.

  The wireless communication system according to the present embodiment forms an autonomous distributed wireless network by a plurality of wireless communication devices 103 to 118 having a wireless function. The wireless communication system transmits sensing information (packets) collected by the wireless communication devices 103 to 118 to the management device 101 or the aggregation device 102 via the autonomous decentralized wireless network, so that sensing information spread in many places is transmitted. It is for efficient collection. In particular, the autonomous distributed wireless network according to the present embodiment performs bidirectional information communication between the demand side and the supply side in the power transmission / distribution system, controls the appropriate demand amount by both control devices, and responds accordingly. This is due to the multistage wireless relay system used to achieve proper power generation maintenance and control.

  The management apparatus 101 is arranged so that information communication can be performed with the aggregation apparatus 102. The management device 101 manages the aggregation device 102. The management apparatus 101 is connected to the aggregation apparatus 102 by a reliable communication means such as a wire. The management apparatus 101 can collect all of the information collected by the distributed wireless communication apparatuses 103 to 118 via the aggregation apparatus 102.

  The aggregation device 102 is arranged in a range where wireless communication can be performed with at least one of the wireless communication devices 103 to 118. The aggregation device 102 supervises a network composed of wireless communication devices 103 to 118 that wirelessly communicate with each other using a multistage wireless relay system. The aggregation device 102 aggregates information collected by the wireless communication devices 103 to 118. In addition, the solid line shown between the radio | wireless communication apparatuses 103-118 and the aggregation apparatus 102 in FIG. 1 has shown that the connection relation (connection state) of radio | wireless communication exists mutually. The wireless communication devices 103 to 118 perform wireless communication between adjacent devices having a connection relationship.

  The wireless communication devices 103 to 118 are arranged in a distributed manner within a range where wireless communication can be performed with each other. The wireless communication devices 103 to 118 may be connected with a sensor 200 described later as a separate element. Note that the wireless communication devices 103 to 118 may include the sensor 200 as the same element. When the sensor 200 is connected, the wireless communication devices 103 to 118 wirelessly transmit sensing information collected by the sensor 200. In the wireless communication devices 103 to 118, for example, watt-hour meters at homes are connected as sensors 200, respectively. That is, each of the wireless communication devices 103 to 118 can wirelessly transmit the amount of power used by the customer. In this specification, the wireless communication devices 103 to 118 may be collectively referred to as at least one of them, or simply referred to as a wireless communication device. Further, in the present specification, in relation to an arbitrary wireless communication device, at least one of wireless communication devices other than the arbitrary wireless communication device may be referred to as another wireless communication device.

  In the wireless communication system configured as described above, each of the wireless communication devices 103 to 118 transmits information to the aggregation device 102 wirelessly directly or indirectly. For example, information collected by the sensor 200 connected to the wireless communication device 114 is transferred to the aggregation device 102 via the wireless communication devices 110 and 105 that are directly or indirectly connected to the wireless communication device 114. Is done. All information collected by the aggregation device 102 is finally transferred to the management device 101 and managed. Information collected by each of the wireless communication devices 103 to 118 is used for state analysis of the information collected object or a region where the object exists.

  FIG. 2 is a block configuration diagram illustrating an example of the management apparatus 101 according to the embodiment. The management apparatus 101 includes a control unit 1011, a communication unit 1012, a storage unit 1013, and an operation unit 1014. The control unit 1011 controls the operation of each unit of the management apparatus 101. The communication unit 1012 is an interface for bidirectional communication with the aggregation device 102 connected to the management device 101. The storage unit 1013 stores various information. The operation unit 1014 is an interface for an operator to operate. With the above configuration, the management apparatus 101 can transmit various types of information to the wireless communication apparatuses 103 to 118 via the aggregation apparatus 102, either automatically or by an operator's operation.

  FIG. 3 is a block configuration diagram illustrating an example of the aggregation device 102 according to the embodiment. The aggregation device 102 includes a control unit 1021, a communication unit 1022, a wireless communication unit 1023, and a storage unit 1024. The control unit 1021 controls the operation of each unit of the aggregation device 102. The communication unit 1022 is an interface for bidirectional communication with the management apparatus 101. The wireless communication unit 1023 is an interface for bidirectional communication with at least one of the wireless communication devices 103 to 118. The storage unit 1024 stores various information.

  FIG. 4 is a block configuration diagram illustrating an example of the wireless communication apparatus 103 according to the embodiment. Note that the wireless communication devices 104 to 118 have the same configuration as the wireless communication device 103, and thus the description of the configuration is omitted. The wireless communication apparatus 103 includes an antenna 1031, a wireless circuit 1032, a data communication unit 1033, an electric field strength measurement unit 1034, a control unit 1035, a storage unit 1036, an operation unit 1037, and a display unit 1038. The wireless communication device 103 is connected to the sensor 200 and transmits sensing information from the sensor 200 to the management device 101 by a multistage wireless relay method.

The wireless circuit 1032 is an interface for bidirectional communication with another wireless device via the antenna 1031.
The data communication unit 1033 has a transmission function and a reception function for transmitting and receiving signals including various information and data to and from other wireless devices via the wireless circuit 1032. The data communication unit 1033 is a transmission unit that transmits a traffic request to be described later to another wireless device. The data communication unit 1033 is a receiving unit that receives traffic described later from another wireless device.

  The electric field strength measurement unit 1034 measures the electric field strength of a signal received from another wireless device via the wireless circuit 1032.

The control unit 1035 controls the operation of each unit of the wireless communication device 103. The control unit 1035 includes a transmission information acquisition unit (acquisition unit) 1035-1, a connection relationship establishment unit (connection relationship establishment unit) 1035-2, a failure detection unit (failure detection unit) 1035-3, and a comparison unit (comparison unit) 1035. -4.
The transmission information acquisition unit 1035-1 has a function of acquiring transmission information between the wireless communication apparatus 103 and another wireless apparatus. The transmission information is, for example, information on a device that transmits traffic to the wireless communication device 103 among other wireless devices, that is, information on devices (connection candidates) that can be connected to the wireless communication device 103 among other wireless devices. It is. The transmission information includes, for example, a wireless link between the wireless communication device 103 and another wireless device (in the relationship with the wireless communication device 103, the wireless communication device other than the aggregation device 102 and the wireless communication device 103). Quality information indicating quality. The transmission information acquisition unit 1035-1 includes a traffic request unit (traffic request unit) 1035-1a, a traffic acquisition unit (traffic acquisition unit) 1035-1b, and a quality information acquisition unit (quality information acquisition unit) 1035-1c.
The traffic request unit 1035-1a transmits a traffic request that is a signal for acquiring transmission information to another wireless device. The traffic acquisition unit 1035-1b acquires traffic (response signal) emitted from at least one of the other wireless devices in response to the traffic request from the traffic request unit 1035-1.
The traffic acquisition unit 1035-1b acquires connection candidate information as transmission information by referring to information on a traffic transmission source. The connection candidate information is useful for grasping candidates for which the wireless communication apparatus 103 can establish a connection relationship.
The quality information acquisition unit 1035-1c measures the quality of the radio link from the traffic, and acquires the quality information of the radio link between the radio communication apparatus 103 and another radio apparatus as transmission information. The quality information is useful not only for candidates for which the wireless communication apparatus 103 can establish a connection relationship but also for grasping the optimum connection partner.

As will be described later, the connection relation construction unit 1035-2, based on the transmission information acquired by the transmission information acquisition unit 1035-1 in order to form an autonomous distributed wireless network, A connection relationship with at least one of the devices is established.
As will be described later, the failure detection unit 1035-3 intentionally generates a failure for a connection candidate in order to detect a potential communication failure.
As will be described later, the comparison unit 1035-4 is included in the traffic request in order to determine whether to transmit traffic to the other wireless communication device in response to the traffic request received from the other wireless communication device. The information is compared with the information held by the wireless communication apparatus 103 itself.

The storage unit 1036 stores various types of information. The storage unit 1036 stores, for example, the transmission information acquired by the transmission information acquisition 1035-1. The storage unit 1036 stores, for example, at least one of installation location identification information of the wireless communication device 103 itself and network identification information of the wireless communication device 103 itself. The installation location identification information is information for identifying a location where the wireless communication apparatus 103 itself is installed. The installation location identification information is, for example, information corresponding to position information of latitude / longitude, a customer number of an installed customer, and the like. The network identification information is information for identifying a unit network to which the wireless communication device 103 itself belongs. For example, one unit network is formed in one aggregation device 102. The network identification information is information corresponding to PAN ID (Personal Area Network ID) of IEEE802.15.4 standard, for example.
The operation unit 1037 is an interface for operating the wireless communication apparatus 103.
The display unit 1038 is a display that displays various types of information.

  Next, an example of a traffic request transmitted from the wireless communication apparatus 103 to another wireless apparatus will be described. Here, an example in which the wireless communication device 103 transmits a traffic request to another wireless device will be described, but the same applies to the case where the wireless communication devices 104 to 118 transmit a traffic request to another wireless device. Description is omitted.

  The traffic request unit 1035-1a transmits a traffic request including the following (1-1) to (1-6) to another wireless device, for example.

<Example of traffic request>
(1-1) Installation location identification information (1-2) Network identification information (1-3) Radio channel (1-4) Transmission rate (1-5) Payload length (1-6) Antenna power (1-1) As described above, the installation location identification information is information indicating a location where the wireless communication device itself that transmits the traffic request is installed. Each of the other wireless devices compares the installation location identification information transmitted from the wireless communication device 103 with the installation location identification information held by itself, and if they match, transmits the traffic to the wireless communication device 103. In other words, the fact that the traffic request includes the installation location identification information is installed at the customer's home for the purpose of controlling the wireless communication device installed outside the home for the purpose of measurement, and home appliances and power storage devices in the home. In communication with a wireless communication device, in order to establish a connection relationship between wireless communication device pairs in the same consumer's house, it contributes to eliminating responses from other wireless devices and avoiding waste of wireless resources.

  As described above, the network identification information (1-2) is information for identifying a unit network to which the wireless communication apparatus itself that transmits the traffic request belongs. Each of the other wireless devices compares the network identification information transmitted from the wireless communication device 103 with the network identification information held by itself, and if they match, transmits the traffic to the wireless communication device 103. That is, the fact that the traffic request includes network identification information limits the wireless device that responds in an installation environment in which other wireless communication systems are mixed or an installation environment in which multiple unit networks exist in the same area in the same wireless communication system. This contributes to avoiding waste of radio resources.

  The wireless channel (1-3) is information on a wireless channel (frequency band) used when the wireless communication apparatus 103 transmits and receives wirelessly, and is information corresponding to a wireless channel number and a frequency, for example. The wireless communication device 103 investigates the influence of adjacent channel interference in an installation environment where a plurality of wireless channels are mixed in the same area or when a wireless communication system for measurement purposes and a wireless communication system for indoor control are mixed. In order to do this, the radio channel of the traffic to which other wireless devices respond is specified. Each of the other wireless devices has confidence when the installation location identification information transmitted from the wireless communication device 103 matches the installation location identification information held by itself or with the network identification information transmitted from the wireless communication device 103. When the network identification information matches, the traffic is transmitted to the wireless communication apparatus 103 through the wireless channel specified by the traffic request.

  The transmission rate (1-4) is information on a transmission rate used when the wireless communication apparatus 103 transmits and receives wirelessly, and is information indicating a data amount that can be transferred within a predetermined time. For example, when a plurality of transmission rates can be selected in the wireless communication device 103 itself, the wireless communication device 103 selects a transmission rate that is frequently used in the wireless communication device 103 itself in order to obtain highly accurate quality information. The transmission rate of traffic to which the wireless device responds may be designated. Each of the other wireless devices has confidence when the installation location identification information transmitted from the wireless communication device 103 matches the installation location identification information held by itself or with the network identification information transmitted from the wireless communication device 103. If the network identification information matches, the traffic is transmitted to the wireless communication apparatus 103 at the transmission rate specified in the traffic request.

  The payload length of (1-5) is information on the payload length used when the wireless communication apparatus 103 transmits and receives wirelessly, and is information indicating the data length. For example, when the size of a packet that can be transmitted and received by the wireless communication device 103 itself is not a fixed length, the wireless communication device 103 selects a payload length that is frequently used to obtain highly accurate quality information, The payload length of the traffic to which the device responds may be specified. Further, the wireless communication device 103 can detect a hidden terminal by selecting the maximum payload length that can be used by the wireless communication device 103 itself in order to increase the probability of packet collision. Each of the other wireless devices has confidence when the installation location identification information transmitted from the wireless communication device 103 matches the installation location identification information held by itself or with the network identification information transmitted from the wireless communication device 103. If the network identification information matches, the traffic is transmitted to the wireless communication apparatus 103 with the payload specified in the traffic request.

  The antenna power (1-6) is the antenna power used when the wireless communication apparatus 103 transmits and receives wirelessly, and is information indicating the transmission output of the radio wave. When a plurality of transmission outputs can be selected by the wireless communication device 103 itself, the antenna power is selected from a frequently used value or the maximum transmission output in order to obtain highly accurate quality information. To 118 and the aerial power to which the aggregation device 102 responds may be designated. Each of the other wireless devices has confidence when the installation location identification information transmitted from the wireless communication device 103 matches the installation location identification information held by itself or with the network identification information transmitted from the wireless communication device 103. If the network identification information matches, the traffic is transmitted to the wireless communication apparatus 103 with the antenna power specified in the traffic request.

  That is, the parameters (1-1) to (1-2) are information for limiting other wireless devices that return traffic to the wireless communication device 103 that has transmitted the traffic request. The traffic request only needs to include at least one of the parameters (1-1) to (1-2). The parameters (1-3) to (1-6) are information for the wireless communication apparatus 103 to request a traffic mode from another wireless apparatus. The traffic request only needs to include at least one of the parameters (1-3) to (1-6). Note that the parameters included in the traffic requests shown in (1-1) to (1-6) are examples, and are not limited to these.

Next, the operation of another wireless device that has received a traffic request from the wireless communication device 103 will be described. Here, the wireless communication apparatus 104 will be described as an example. Note that the operations of the wireless communication devices 105 to 118 and the aggregation device 102 are the same as the operations of the wireless communication device 104 described below, and a description thereof will be omitted. Further, since the operation when the wireless communication apparatus 103 receives a traffic request from another wireless communication apparatus is the same as the operation of the wireless communication apparatus 104 described below, the description thereof is omitted.
The comparison unit of the wireless communication device 104 compares the installation location identification information included in the traffic request received from the wireless communication device 103 with the installation location identification information held by the wireless communication device 104, and the traffic request received from the wireless communication device 103. At least one of the comparison between the network identification information included in the network identification information and the network identification information held by the wireless communication apparatus 104 is executed. The data communication unit (transmission unit) of the wireless communication device 104 transmits traffic to the wireless communication device 103 when the result of at least one comparison executed by the comparison unit is the same.

  When the wireless communication device 104 determines to transmit traffic to the wireless communication device 103, the wireless communication device in which other parameters (wireless channel, transmission rate, payload length, antenna power) included in the traffic request are set to specified values. The traffic addressed to 103 is generated. The wireless communication device 104 transmits the generated traffic to the wireless communication device 103. The parameters (1-3) to (1-6) included in the traffic request may be specific numerical values or qualitative index values such as “minimum” and “maximum”.

  Next, an example of quality information acquired by the quality information acquisition unit 1035-1c will be described. The quality information includes at least one of the following (2-1) to (2-5).

<Example of quality information>
(2-1) Received signal strength (2-2) Number of failed acknowledgment frame receptions (2-3) Radio channel load (2-4) Retransmission ratio (2-5) Bit error (2-1) received signal The strength is a value indicating the electric field strength of a signal received by the wireless communication device 103 from another wireless device. The strength of the received signal strength is characterized by being inversely proportional to the number of signal bit errors and packet errors. That is, if the received signal strength is strong, the number of occurrences of bit errors and packet errors is small. Further, when there is an obstacle such as a shield between the wireless communication devices, the direct wave is attenuated, so that the received signal intensity is also attenuated.

  The number of unsuccessful receptions of the acknowledgment frame (2-2) is a value indicating the number of times that an acknowledgment is not obtained from the other wireless device of the transmission partner even though the wireless communication device 103 has transmitted a packet. The number of failed acknowledgment frame receptions increases when a packet is lost during packet transmission, and increases both when a packet arrives at the transmission partner and when an acknowledgment is lost.

  (2-3) The wireless channel load is a value indicating a ratio of time during which the wireless communication apparatus 103 performs carrier sense and determines that it is in a carrier busy state per certain time. The wireless channel load increases when it is detected with a received signal strength of a certain level or more among signals transmitted from other wireless devices installed around the wireless communication device 103, and other systems that use the same wireless band There is also a feature that it increases when the radio wave of the other wireless communication device is detected.

  (2-4) The retransmission ratio indicates that an acknowledgment is not obtained from the other wireless device of the transmission partner even though the wireless communication device 103 transmits the packet, and the retransmission ratio is between the wireless communication device 103 and the other wireless device. This is a value indicating the rate at which packets of the same content are retransmitted. The retransmission ratio increases when a packet is lost during packet transmission, and also increases when a packet arrives at the transmission partner or when an acknowledgment is lost.

  (2-5) Bit error is an index indicating the presence of a bit error in a packet transmitted / received between the wireless communication apparatus 103 and another wireless apparatus, and is the number of bit errors detected. The packet transmitted / received between the wireless communication apparatus 103 and another wireless apparatus has an error control function for detecting a bit error generated in the transmission line added to the packet in advance. The error control function includes at least one of an error detection code and an error correction code. The wireless communication device 103 detects a packet bit error based on the error control function. Bit errors are characterized by an increase in received signal strength due to shielding obstructions on the transmission line, packet collisions, and the like.

  The elements of the quality information shown in (2-1) to (2-5) are examples, and are not limited to these.

  FIG. 5 is a diagram illustrating an example of quality information acquired by the wireless communication apparatus 103 and stored in the storage unit 1036. As shown in FIG. 5, the quality information acquisition unit 1035-2 stores the quality information including the elements described in (2-1) to (2-5) described above in association with each other wireless device. Save to 1036. The base station A in FIG. 5 indicates the aggregation device 102, and each of the terminals 1 to 5 indicates one of the wireless communication devices. Note that the quality information acquisition unit 1035-2 does not acquire quality information by measuring the quality of the radio link based on traffic issued in response to a traffic request from the radio communication device 103, but also other radio devices. The quality of the radio link may be measured based on traffic originating from other purposes. This is because other wireless devices may send packets to the wireless communication device 103 regardless of whether or not the wireless communication device 103 has transmitted a traffic request. That is, quality information is transmitted between the wireless communication device 103 and another wireless device, such as traffic that is a response to a single traffic request, repeated traffic that is a response to a repeated traffic request, or a packet that does not depend on the traffic request. It can be acquired by referring to any signal transmitted or received. The wireless communication apparatus 103 may calculate the maximum value, the minimum value, the average value, the moving average, the standard deviation, and the like for the quality information that changes in a short time, and then store these in the storage unit 1036. .

  Next, the operation of the connection relationship construction unit 1035-2 will be described. The connection relationship construction unit 1035-2 can construct a connection relationship with any wireless device in the connection candidates based on the connection candidate information stored in the storage unit 1036 without depending on the quality information. it can. Note that the wireless communication device 103 may always establish a connection relationship with not only one wireless device among connection candidates but also a plurality of wireless devices in consideration of the occurrence of a communication failure.

Based on the quality information stored in the storage unit 1036, the connection relationship construction unit 1035-2 may determine an optimal wireless device from connection candidates and construct a connection relationship. Note that the wireless communication device 103 may always establish a connection relationship with not only one wireless device among connection candidates but also a plurality of wireless devices in consideration of the occurrence of a communication failure. The connection relationship constructing unit 1035-2 may construct a connection relationship with, for example, a wireless device having the strongest received signal strength or a plurality of wireless devices selected in order of the strongest received signal strength. For example, the connection relation construction unit 1035-2 may exclude wireless devices having a predetermined number of reception failures, a number of reception failures, a retransmission ratio, or a bit error from connection candidates. In addition, the way of using the quality information by the connection relation construction unit 1035-2 described above is an example, and is not limited.
The connection relationship construction unit 1035-2, for example, sums the values obtained by multiplying the elements included in the quality information by different coefficients, and selects the devices with the largest total value (good quality) or the largest total value. A connection relationship may be established with a plurality of wireless devices.

  Next, the operation of the failure detection unit 1035-3 will be described. The failure detection unit 1035-3 intentionally generates a communication environment in which a failure is likely to occur for connection candidates, and detects a potential communication failure in the propagation environment (wireless link). In order to detect a wireless communication device that is a hidden terminal, the failure detection unit 1035-3 transmits a packet having the longest payload length that can be used in the wireless communication device 103 itself to the connection candidate, and detects a packet collision. The reason why the packet having the maximum payload length is used is to increase the probability of packet collision. When there is a hidden terminal, an increase in the number of acknowledgment frame reception failures, an increase in the retransmission rate, and an increase in bit errors are expected due to packet collision. Since the wireless communication device 103 can acquire more accurate quality information by the function of the failure detection unit 1035-3, it is possible to determine an optimal wireless device from among connection candidates based on the quality information. . Note that the failure detection unit 1035-3 may transmit a packet having the maximum payload length to the connection candidate or may transmit the packet to all wireless devices when a traffic request is transmitted.

  According to the present embodiment, it is possible to provide a wireless communication apparatus that can establish a connection relationship with an optimal partner with a simple configuration. Therefore, according to this embodiment, it is possible to construct an autonomous distributed wireless network using a stable multistage wireless relay system.

Further, when establishing a connection relationship with another wireless device, the wireless communication device measures the link quality with the other wireless device, so that the amount of communication on the wireless link in the network is small or new Even in the case where there is a device that is not yet in communication such as installation, a potential communication failure in the surrounding propagation environment can be detected in advance.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 101 ... Management apparatus, 102 ... Aggregation apparatus, 103-118 ... Wireless communication apparatus, 1011 ... Control part, 1012 ... Communication part, 1013 ... Storage part, 1014 ... Operation part, 1021 ... Control part, 1022 ... Communication part, 1023 ... Wireless communication unit, 1024 ... storage unit, 1031 ... antenna, 1032 ... wireless circuit, 1033 ... data communication unit, 1034 ... electric field strength measurement unit, 1035 ... control unit, 1036 ... storage unit, 1037 ... operation unit, 1038 ... display unit DESCRIPTION OF SYMBOLS 1035-1 ... Transmission information acquisition part, 1035-1a ... Traffic request part, 1035-1b ... Traffic acquisition part, 1035-1c ... Quality information acquisition part, 1035-2 ... Connection relation construction part, 1035-3 ... Fault detection Part, 1035-4 ... judgment part.

Claims (9)

Receiving means for receiving traffic from other wireless devices;
Obtaining means for obtaining transmission information between the wireless communication device and another wireless device based on the traffic;
A connection relationship building means for building a connection relationship with at least one of the other wireless devices based on the transmission information to form an autonomous distributed wireless network;
A wireless communication device.   The wireless communication device according to claim 1, wherein the transmission information is information on a device that transmits the traffic to the wireless communication device among the other wireless devices.   The wireless communication device according to claim 1, wherein the transmission information is quality information of a wireless link between the wireless communication device and another wireless device.   The wireless communication device according to claim 1, further comprising: a traffic request unit that transmits a traffic request to the other wireless device.   The traffic request includes at least one of installation location identification information for identifying a location where the wireless communication device is installed and network identification information for identifying a unit network to which the wireless communication device belongs. 4. The wireless communication device according to 4.   The wireless communication device according to claim 4, wherein the traffic request includes at least one parameter of a wireless channel, a transmission rate, a payload length, and an antenna power for requesting the aspect of the traffic. Comparison of the installation location identification information for identifying the location where the other wireless communication device is installed received from the other wireless device and the installation location identification information held by the wireless communication device, and the received from the other wireless device Comparison means for performing at least one of comparison between network identification information for identifying a unit network to which the other wireless device belongs and network identification information held by the wireless communication device;
A transmission means for transmitting traffic to the other wireless device if the result of at least one comparison performed by the comparison means is a matching result;
The wireless communication apparatus according to claim 1.   The quality information includes a received signal strength of a signal received from the other wireless device, a number of reception failures of an acknowledgment frame from the other wireless device in the wireless communication device, and a certain time during which carrier sense is performed in the wireless communication device. A wireless channel load indicating a proportion of time determined to be a carrier busy state, a retransmission rate of packets between the wireless communication device and the other wireless device, the wireless communication device and the other wireless The wireless communication device according to claim 3, comprising at least one of the number of bit error detections with the device. A failure detection means for detecting a packet collision by sending a packet having the longest payload length to the other wireless device;
The wireless communication apparatus according to claim 1.

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