JP2009094768A - Power line communication apparatus and automatic registration method for power line communication apparatus - Google Patents

Abstract

The present invention enables secure connection to an existing power line communication network simply by inserting a new device into a power outlet.
A beacon processing unit 103 receives a beacon from a base unit of an existing network, and simultaneously measures an AGC value and a CINR value of the beacon by an AGC and a CINR measurement unit 105, respectively, and uses the AGC value and the CINR value of the beacon. When the registration determination unit 102 determines that the parent device exists in the same home, the parent device and the registration and the unique key generation unit 106 are used to generate an encryption key. If it is determined that there is no parent device in the same house, the existing child device search / processing unit 104 searches for the existing child device, and the existing child device is found in the same house based on the AGC value and CINR value of the response from the existing child device. In the same way, registration and generation of an encryption key are performed through the existing slave unit by the same method.
[Selection] Figure 10

Description

  The present invention relates to a technology that makes it possible to easily register a new communication device and generate an encryption key in a power line communication network.

  As a communication technology in the home, a communication technology that does not require additional wiring, such as power line communication, has attracted attention. Power line communication using a power line as a transmission medium uses a frequency band of 2 MHz to 30 MHz, subdivides it into subcarriers, and performs transmission / reception on one logical channel using OFDM (Orthogonal Frequency Division Multiplexing). However, on the other hand, although there is no need for additional wiring for power line communication, the electrical signal may reach several neighbors along the stretched power line. In such an environment where the transmission range of the signal is not physically limited, a logical network is configured only by the home device so that the transmitted information cannot be decoded by a communication device outside the home. It is necessary to perform cryptographic communication when sending and receiving frames.

  In order to configure a logical network, a network identifier or a network encryption key must be shared with network member devices. However, in order to input the identifier and the encryption key, it is necessary for the apparatus to have an input interface, and it is necessary to make complicated settings for the user. In particular, in the case of a built-in device or a wall-embedded device, it is difficult to attach and operate an input interface, so a method that does not require an input operation, that is, can be set automatically is desired.

In order to identify the target device, a method of detecting and determining the signal intensity of the target device has been conventionally used. For example, in Patent Document 1, a connection request is broadcast to a parent device, and a connection request response is received from the parent device. And it connects with the main | base station which sent the connection request response of the largest received power or the smallest error rate. In Patent Document 2, the transmission power value of the pilot channel is notified to the mobile terminal in advance, and the closest “close” of the radio wave distance calculated from the received electric field strength value and the transmission power value of the pilot channel and the ratio of the desired wave to interference wave ratio are Connect with a good base station. In Patent Document 3, a new device is placed at a first position and a second position (both near the target device), an inquiry signal is sent to peripheral devices, and the reception level of the response signal is measured. Connect to the device with the largest difference in reception level measured at the two locations.
Japanese Patent Laid-Open No. 2005-6207 JP 2006-135520 A JP 2006-157680 A

  In the method for selecting the target device, the difference between the reception field strength value and the transmission power value, the device having the largest difference between the reception field strength values at two different locations is not necessarily a home device due to the transmission characteristics of power line communication. If it is connected based on that, there is a possibility that it will be erroneously connected to a neighboring device. In addition, the device with the lowest signal error rate and the best desired signal-to-interference ratio is not necessarily a home device due to the interference characteristics of power line communication. there is a possibility. In addition, it is necessary to move the device twice or three times, and there is no problem with a printer or a camera, but it seems impossible for a built-in device (particularly a living device). Furthermore, in the case of power line communication, it is not possible to ensure that even a nearby power outlet is close in distance.

  The present invention has been made in view of the circumstances of power line communication, and provides a method for configuring a logical network that is configured only from devices in a house without a user performing an operation related to setting when adding a new device. For the purpose.

  In order to achieve the above object, according to the present invention, a new power line communication device newly added includes a beacon automatic gain control value (AGC value) periodically transmitted from an existing master device and a carrier-to-interference / noise ratio. It is determined whether or not the master device is installed in the same home based on whether or not each value (CINR value) satisfies a predetermined threshold, and if so, a registration request is transmitted to the master device, and Register and exchange unique encryption keys.

  On the other hand, when the AGC value and CINR value of the beacon of the master device do not satisfy the predetermined threshold values of the AGC and CINR values, or when the beacon cannot be received from the master device, a search request is made for all existing power line communication devices to be transmitted. When the AGC value and the CINR value of the search response returned from the existing power line communication device satisfy the predetermined threshold values, the existing power line communication device is installed in the same house. The registration request is transmitted to the existing apparatus, and registration and a unique encryption key are exchanged.

  In the above-described process, the existing power line communication device returns a search response to the new power line communication device when receiving a search request transmitted by broadcast from the newly added new power line communication device. Further, when a registration request transmitted from the new power line communication device to itself is received, registration and exchange of a unique encryption key are performed with the new power line communication device.

  The existing master device or the existing power line communication device can select, as a selectable means, an automatic gain control value (AGC value) and a carrier-to-interference / noise ratio value (CINR value) of a registration request from the new power line communication device. Each of which satisfies a predetermined threshold value, it is determined that the new power line communication device is installed in the same house, and a means for registering and exchanging a unique encryption key with the new power line communication device is also provided. .

  In addition, the existing power line communication device that has registered with the new power line communication device encrypts the identifier of the new power line communication device and the unique encryption key with its own unique encryption key, and master power line communication of the network Means for transferring to the device.

  According to the present invention, when a new device is added, it can be securely connected to an existing network simply by being plugged into a power outlet. It is also possible to easily unify the network and change the parent machine.

(1) Network setting The power line communication described in the present invention is mainly targeted at a residence (or a small office) or the like. Since power lines are used as transmission media, the wiring structure must be considered as an element that affects the physical connection of the power line communication network. First, commercial power transmission systems introduced from outside include a single-phase two-wire system, a single-phase three-wire system, and a very rare three-phase three-wire system. And the relationship between any two power outlets in the house is the same under the same breaker (in-phase and same circuit) due to the difference in the power transmission method used and the wires drawn into each breaker of the distribution board in the house. It is divided into two different circuit breakers that share the lead-in line (in-phase separate circuit), or two different breakers connected to different lead-in lines (different-phase separate circuit). FIG. 1 shows a single-phase three-wire system. L1 and L2 are opposite-phase voltage lines, and N is grounded through a neutral line. The power outlets 11 and 12 belong to the same-phase same circuit under the same breaker 10, and either one of the power outlets 11 and 12 is connected to the same L1 and N, respectively, but is connected to the same breaker 20 and 30, respectively. Any one of the power outlets 11, 12, and 21 and 31 are connected to the voltage lines of L1 and L2, respectively, and belong to different-phase circuits because they are under another breaker. In any of the above cases, the power line communication signal can reach the partner device connected to the power outlet, but depending on the installed circuit, there may be a large difference in transmission characteristics. By the way, in the case of a single-phase two-wire system, there is only an in-phase identical circuit or an in-phase separate circuit between power outlets in the house.

  The transmission characteristics of electrical signals in the frequency band of 2 MHz to 30 MHz used in power line communication differ depending on the in-phase identical circuit, the in-phase separate circuit, or the out-of-phase separate circuit. Specifically, in terms of average attenuation, the in-phase identical circuit In the case of, in the case of the in-phase separate circuit and the out-of-phase separate circuit, it has been found that it reaches 50 dB or more. Furthermore, in the case of an apartment house (FIG. 2), since it can be considered in the same way as an in-phase circuit or an out-of-phase circuit with an adjacent house, the current situation is that it cannot be distinguished by signal attenuation. In a communication environment that is not physically separated and security is not guaranteed in this way, a logical network is configured in the upper data link layer, and devices on the same network communicate with each other sharing the same network identifier and network key. Is required (FIG. 3). Thereby, since a device not registered in the logical network does not have a network key of the logical network, data communication with member devices of the logical network can be blocked.

  The specific configuration method of the logical network is roughly divided into two steps. In step 1, the new device performs registration and unique encryption key exchange / sharing with an existing device (usually a master device or a parent device). For example, in FIG. 4, the child device A1 of the new device performs a unique key A1 exchange 41 with the parent device A. In step 2, the new device acquires a network key necessary for encrypted communication with the same network. As a result, each device (child device) other than the parent device shares a unique encryption key with the parent device, and all devices (parent device and all child devices) share the same network key. For example, in FIG. 4, the slave unit A1 receives and acquires the network key of the master unit A encrypted with the unique key A1 from the master unit A by the network key distribution 42.

  As described above, the devices in the same logical network are installed in the same-phase same circuit, the same-phase different circuit, or the different-phase different circuit. When registration of a new device (child device) is started, first, it is confirmed whether or not an existing device exists in the same phase and same circuit. Therefore, it is necessary to connect to a power outlet (for example, the same power outlet) of the same circuit as the existing device. When the registration is completed, the new device may be moved to a place where the new device is to be installed, that is, the in-phase circuit or the out-of-phase circuit. Note that the registration information of the slave unit is always stored in the non-volatile memory unless it is reset once registration is completed, and the new device does not change as a member of the logical network. Incidentally, although the same power outlet is of course the same phase and same circuit, the power outlets in the same room are also likely to be the same phase and same circuit.

  All devices in the same logical network may or may not be used in the same circuit in the same phase. In the latter case, it is sufficient that there is at least one movable device in the network. Specifically, first, this device is registered as a parent device. Then, if necessary, for example, when adding a new device that cannot be moved, this device is used as a setting device, and the device is moved to the vicinity of the new device and registered with the new device. Note that the master unit may be used as a device for this setting.

  In addition, although it seems that it is not usually performed to install a plurality of logical networks in the same-phase same circuit, the installation itself is possible under the intention of the user. However, when a new device is connected to a power outlet of the same-phase same circuit where multiple master units exist, or the same-phase same circuit where multiple slave units belonging to different networks exist, the new device detects it and automatically A signal indicating that connection is impossible is displayed on the display unit. In this case, it is possible for the user to select one of two methods. Unplug the base unit or handset that is not connected to the power outlet, and reconnect the new device to the power outlet. Alternatively, the new device is reconnected to a power outlet of the same-phase same circuit where only the parent device or the child device of the same network as the connection destination exists. If a new device is to be added in the same-phase same circuit where devices of different networks exist, a registration destination is selected by pressing a button provided in the parent device or the existing child device. When the button is pressed, a network identifier notification is transmitted from the device, and the new device registers directly with the parent device having the received network identifier, or registers with the parent device through the device that transmitted the network identifier. It may be.

  The new device is said to be in a state where it can receive a beacon from the parent device. In fact, even if a beacon cannot be received directly from the parent device, an existing device of the same logical network is installed in the same phase and same circuit. If this is the case, registration may be performed by the same mechanism as described above using this existing slave as a proxy. However, in this case, in order to perform communication (synchronization, etc.) after registration, an additional mechanism is used in which the information contained in the beacon is transferred to the slave unit and transmitted / received based on the transferred information. It is necessary to.

  In the case of a house (or a small office), a distribution board with a breaker is basically installed, and the power outlets of each room are connected to each other via the breaker in the distribution board. . On the other hand, in an environment where a distribution board having a breaker is not used, there is a possibility that the power line communication signal reaches farther and is automatically connected to a device within a wide range. In such a use environment, the automatic connection of the present invention may be similarly applied by providing a signal attenuating means (for example, an attenuator or a filter) similar to that of a breaker.

(2) Device Configuration FIG. 5 shows the external configuration of the power line communication device. Reference numeral 50 denotes a power inlet, 51 denotes a connection port of Ethernet (registered trademark), and 52 denotes a display unit (LED). This is the external configuration of a typical LAN-PLC adapter. However, as an external interface, a wireless LAN or another communication interface may be used instead of Ethernet (registered trademark).

  The LED of the display unit can display at least five states, that is, before setting, during setting, registration destination unspecified, setting success, and setting failure. Note that a button may be provided as an input means when registration destination identification assistance is required.

  Furthermore, in order to easily provide an environment of the same phase and the same circuit, for some devices (for example, a setting-dedicated device), a power supply circuit is provided in order to provide a power supply and a communication path to the newly added device. An attached power outlet may be prepared by branching (63 in FIG. 6).

  In addition to the single adapter device as described above, application to a built-in type or an embedded type device can be assumed. Examples include door phones, distribution boards, power line power taps, and the like. In other words, the technology of the present invention may be provided in the form of hardware modules and software modules (for example, SDK: Software Development Kit) incorporated in other devices. In such a case, each part as described above may be slightly different from the illustrated state in appearance.

  FIG. 7 shows the internal configuration of the apparatus. The present invention relates to AGC 72, PLC PHY 74, PLC MAC 76, CPU 77, and the like. The AGC value is stored in register 75 and is overwritten to the value when the next frame is received. A program related to registration is executed by the CPU 77. As the NIC 79, an Ethernet (registered trademark) module is used. However, as described above, a wireless LAN or other communication interface module may be replaced here.

  As shown in FIG. 7, the AGC value and the CINR value are obtained from the register 75 and the PLC MAC 76 of the PLC PHY 74, respectively. The AGC value and CINR value acquired in this way are guaranteed to be in the same frame by providing the processing mechanism shown in FIG. Specifically, when receiving and detecting 83 a power line communication frame from the PHY 80 at the μ code 81 level, the μ code interrupt 84 is made to the firmware, and the MAC address of the transmission source from the MAC address storage register 86 and the AGC value from the AGC register 85 are obtained. Read, temporarily store as MAC address: AGC value pair 87, catch a frame to be processed later by firmware, and provide the AGC value as frame information together with its CINR value.

  FIG. 9 shows functional units related to the connection setting unit in the apparatus. The connection setting unit 90 includes the program of the present invention, and the execution result is stored in the terminal information recording unit 91. The terminal management unit 92 performs terminal authentication and management based on information stored in the terminal information recording unit 91. A signal related to the connection setting is displayed on the display unit 93.

  FIG. 10 shows each functional unit of the connection setting unit of the slave unit. Reference numeral 101 denotes a registration execution unit that performs registration with an existing device (such as a parent device). Reference numeral 102 denotes a registration determination unit that determines a registration destination. Reference numeral 103 denotes a beacon processing unit that performs processing on a beacon from the parent device. Reference numeral 104 denotes an existing slave unit search / processing unit that searches for an existing slave unit and confirms its presence. Reference numeral 105 denotes an AGC and CINR measurement unit that measures AGC values and CINR values of beacons and existing slave search responses. Reference numeral 106 denotes a unique key generation unit that generates a unique encryption key with an existing device (base device or the like). In the case of a new slave unit, the registration determination unit determines whether or not the same phase and same circuit as the parent unit is based on the AGC value and CINR value of the beacon. If it is not an in-phase identical circuit, it is determined whether there is an existing slave unit in the same-phase identical circuit based on the AGC value and CINR value of the existing slave unit search and search response, and if present, it is registered as the slave unit. . If it does not exist, automatic connection is impossible. In the registration, the unique key generation unit 106 is used to generate a unique encryption key for the new child device to be registered.

  FIG. 11 shows each functional unit of the connection setting unit of the base unit. The AGC and CINR measurement unit 114 acquires the AGC value and the CINR value of the registration request received from the new slave unit by the registration accepting unit 113, and the registration judgment unit 112 determines whether or not the new slave unit is in the same phase and the same circuit. If it is determined that the circuits are in-phase and identical, the new slave unit is registered and the unique key generation unit 115 is used to generate a unique encryption key for the new slave unit.

(3) Device functions (master unit, existing slave unit, new slave unit)
FIG. 12 shows a flowchart of the master unit regarding connection setting. The base unit periodically transmits a beacon by broadcast (broadcast) (S120). When a registration request transmitted by destination identification (unicast) is received from the new slave unit (S121), registration with the new slave unit is executed (S122). Note that the master unit may execute registration with the new slave unit after determining that the new slave unit is in the same phase and same circuit with the AGC value and CINR value of the registration request. When receiving the proxy registration request from the existing slave unit (S123), the master unit decrypts the proxy registration request and stores the information of the new slave unit (at least the MAC address and the unique encryption key) included in the terminal information recording unit. (S124). Then, a proxy registration response including the result of proxy registration is returned to the existing slave unit. The proxy registration request and proxy registration response are transmitted after being encrypted with the unique encryption key of the existing slave unit. These frames may be transmitted after being encrypted with a network key.

  FIG. 13 shows a flowchart of an existing slave unit related to connection setting. When the existing child device receives the existing child device search request transmitted by broadcast from the new child device (S130), it returns an existing child device search response (S131). When a registration request transmitted by unicast is received from the new slave unit (S132), registration with the new slave unit is executed (S133). The existing slave unit may execute registration with the new slave unit after determining that the new slave unit is in the same phase and same circuit as the self-slave unit based on the AGC value and CINR value of the registration request. After the registration is completed, a proxy registration request including information on the new slave unit (at least the MAC address and the unique encryption key) is transmitted to the master unit, and the main registration of the new slave unit is executed (S134).

  FIG. 14 is a flowchart of the new slave unit related to connection setting. The new slave unit receives a beacon from the master unit after activation (S140), and determines whether the same phase and same circuit as the master unit is based on the AGC value and CINR value of the beacon (S141). If so, a registration request is transmitted to the base unit by unicast, and registration is executed (S142). If it is not an in-phase identical circuit, an existing slave unit search request is transmitted by broadcast (S143), and the existing slave unit is in phase with itself by the AGC value and CINR value of the existing slave unit search response from the existing slave unit. It is determined whether or not the circuit is a circuit (S144), and if it is an in-phase identical circuit, a registration request is transmitted to the existing slave unit by unicast and registration is executed (S145). If they are not in-phase and identical circuits, the registration destination cannot be determined (S146), and reconnection is required. In addition, if it is determined that there is a parent device or an existing child device in a different network in the same circuit and the same circuit, if the network identifier is notified by pressing the button of the parent device or existing child device to be registered as a registration destination cannot be determined. The registration may be performed by transmitting a registration request to the base unit having the identifier by unicast (not shown).

  A sequential method is used as the method of searching for the existing slave unit. Specifically, the existing slave unit search request is transmitted while gradually expanding the transmission range by changing the transmission method and transmission power (FIG. 15). By doing so, when there are many existing slave units, the possibility of collision of existing slave unit search responses from the respective slave units can be reduced. Further, in order to reduce the number of existing slave unit search responses, the existing slave unit can be configured when it is determined from the AGC value and CINR value of the existing slave unit search request that the new slave unit is not in the same phase and same circuit as itself. The search response may not be returned.

  An example of a logical discriminant for determining whether or not they are in-phase and identical circuits is shown below.

However, AGC _{threshold 1} and AGC _{threshold 2} are predetermined AGC thresholds, and CINR _{threshold 1} and CINR _{threshold 2} are predetermined CINR _thresholds .

  It should be noted that even if this formula is used with some changes or expansions, it is included in the scope of the present invention as long as it does not change the in-phase same circuit determination using the AGC value and the CINR value. You may think.

  When measuring the AGC value and the CINR value, the transmission power of the beacon, the registration request, and the existing slave unit search response is assumed to be constant or known. Even when the same frame is divided into a plurality of subcarriers and transmitted, transmission on all the subcarriers uses the same transmission power, so that the discriminant of the in-phase and same circuit still holds.

  When generating a unique encryption key accompanying the registration process, first, information for key generation is exchanged, and then a unique encryption key is generated using the exchanged information. The key generation method uses a key generation method based on public information exchange such as Diffie-Hellman. A key generation method based on secret information exchange may be used.

  In the new slave unit, the registration trigger is automatically performed after the start-up and initialization. However, when the button is attached, the button may be pressed as a re-registration trigger after the registration destination determination is impossible.

  In the case of a device provided with a device mode (parent device and child device) selection button, the parent / child mode is manually selected. In the case of a device that does not have a device mode (parent device and child device) selection button, the device mode is automatically selected. In the latter case, the first unit becomes a base unit if no power line signal such as a beacon is received. If something is received, it waits for the second unit to be connected in the same phase and same circuit, and when an existing slave unit search request is sent from the second unit, an existing slave unit search response is returned and at the same time Become a machine. Alternatively, the first or second unit may be determined as the parent unit based on information such as the mobility of the included device and the firmware version by exchanging information based on the existing slave unit search request and response.

  Although not shown in the drawings, the present invention may be applied to unification of two networks or replacement of a parent device.

  To unify the two networks, connect each parent unit to the same phase and same circuit, and press the button (you do not have to press it if there is no button), and the beacon of the other party between the two parent units From the AGC value and CINR value, it is determined that the circuits are in-phase and the same circuit, and one of the parent devices is determined as a new parent device in accordance with the prescribed rules, and the other parent device becomes a child device. Registration is performed, terminal registration information related to the child device that the device has is transferred to the new parent device, and a notification of changing the parent device is sent to each child device. By doing so, the two networks can be unified into one network.

  When changing the master unit, unplug the existing master unit from the power outlet and connect the new master unit to a power outlet in the same circuit as the existing slave unit. Will be re-registered as Furthermore, the existing slave unit notifies the other existing slave units that the master unit has changed, and all the other existing slave units re-register with the new master unit.

  The power line communication device and the automatic registration method of the power line communication device according to the present invention have an effect that can be securely connected to an existing network simply by plugging into a power outlet when adding a new device. It is useful as an automatic registration method and communication apparatus for setting a common secret key used for secret communication. Also, it can be applied to applications such as network unification and easy replacement of the master unit.

Diagram showing same-phase same circuit, same-phase different circuit, and different-phase different circuit Diagram showing power wiring structure Diagram showing logical network Diagram showing the structure of a logical network The figure which shows the external appearance of an example of a power communication apparatus Figure showing the appearance of an example of a power communication device (with attached power outlet) Diagram showing the internal structure of the power communication device The figure which shows the acquisition of AGC value, and the synchronization with CINR value The figure which shows each functional part which relates to connection setting The figure which shows each function part of the connection setting part of the cordless handset The figure which shows each function part of the connection setting part of the main phone Master unit flowchart Flow chart of existing slave unit New handset flowchart Diagram showing existing slave unit search and proxy registration by existing slave units

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Registration execution part 102 Registration judgment part 103 Beacon process part 104 Existing cordless handset search and process part 105 AGC and CINR measurement part 106 Unique key generation part

Claims (30)

Is a new power line communication device newly added to a power line communication network composed of power line communication devices installed in the same house as at least one communication device among the existing power line communication devices in the power line network? Whether or not there is an existing power line communication device installed in the same house, and a determination unit that determines whether or not it is based on the transmission characteristics of the power line communication signal sent from the existing device. A new power line communication apparatus, wherein registration is performed by transmitting a registration request. The power line communication signal is a beacon periodically transmitted from a master device, and an automatic gain control value (AGC value) and a carrier-to-interference / noise ratio value (CINR value) of the beacon measured while receiving the beacon are respectively The new power line communication apparatus according to claim 1, further comprising: the determination unit that determines that the master device is installed in the same house when a predetermined threshold is satisfied. When the measured AGC value and CINR value of the beacon do not satisfy the predetermined threshold value, a search request is transmitted by broadcast to all the existing power line communication devices, and the existing power line communication device When the AGC value and CINR value of the search response measured while receiving the returned search response each satisfy a predetermined threshold, it is determined that the existing power line communication device is installed in the same house The novel power line communication apparatus according to claim 2, further comprising a determination unit. When a beacon is not received from the master device, a search request is transmitted by broadcast to all existing power line communication devices, and a search response returned from the existing power line communication device is received as the power line signal. 2. The apparatus according to claim 1, further comprising: a determination unit configured to determine that the existing power line communication device is located in the same house when the AGC value and the CINR value of the search response measured while satisfying a predetermined threshold value. The new power line communication apparatus described in 1. 5. The new power line communication device according to claim 3, wherein when the search request is transmitted, the search request is transmitted in several times while gradually increasing transmission power to search for an existing power line communication device in the same house. 5. The determination unit according to claim 1, further comprising: a determination unit configured to use the same breaker as the same premises, the maximum AGC value in the case of the same breaker as the AGC threshold value, and the minimum CINR value as the CINR threshold value. The new power line communication apparatus described in 1. 2. The key generation means for exchanging information for key generation with the existing power line communication device in registration with the existing power line communication device, and generating a unique encryption key based on the exchanged information. The new power line communication apparatus described in 1. 5. The novel device according to claim 4, wherein when a beacon cannot be received from the master device and no search response is received from an existing power line communication device in the search, the master device itself becomes a master device and starts sending a beacon. Power line communication equipment. One existing power line communication device among the power line communication devices that make up the power line communication network, which transmits beacons in a broadcast at regular intervals, and a registration request sent to itself from a newly added power line communication device The master power line communication device performs registration with the new power line communication device upon receipt of. When the automatic gain control value (AGC value) and the carrier-to-interference / noise ratio value (CINR value) of the registration request measured while receiving the registration request from the new power line communication device each satisfy a predetermined threshold, The master power line communication apparatus according to claim 9, further comprising a determination unit that determines that the new power line communication apparatus is installed in the same house, and performs registration with the new power line communication apparatus. 11. The master power line communication according to claim 10, further comprising: the determination unit having the same breaker under the same house, the AGC threshold when the same breaker is under control as the AGC threshold, and the CINR minimum as the CINR threshold. apparatus. A key for exchanging information for key generation with the new power line communication device in registration with the new power line communication device and generating a unique encryption key for the new power line communication device based on the exchanged information The master power line communication apparatus according to claim 9, further comprising a generation unit. When a proxy registration request encrypted with a unique encryption key of the existing power line communication device transmitted to itself is received from another existing power line communication device, a new power line communication included in the proxy registration request is received. The master power line communication apparatus according to claim 12, further comprising means for decrypting and registering the apparatus identifier and the unique encryption key. A search request transmitted by broadcast from a newly added power line communication device is received, a search response is returned to the new power line communication device, and a registration request transmitted from the new power line communication device to itself is sent. When received, the existing power line communication device registers with the new power line communication device. When the automatic gain control value (AGC value) and the carrier-to-interference / noise ratio value (CINR value) of the registration request measured while receiving the registration request from the new power line communication device each satisfy a predetermined threshold The existing power line communication device according to claim 14, further comprising a determination unit that determines that the new power line communication device is disposed in the same house, and performs registration with the new power line communication device. The existing determination unit according to claim 15, wherein the determination unit includes the same breaker serving as the same premises, the AGC threshold when the same breaker is served as the AGC threshold, and the CINR minimum value as the CINR threshold. Power line communication device. A key for exchanging information for key generation with the new power line communication device in registration with the new power line communication device and generating a unique encryption key for the new power line communication device based on the exchanged information The existing power line communication apparatus according to claim 14, further comprising a generation unit. The identifier of the new power line communication apparatus and the unique encryption key are further encrypted with its own encryption key, stored in a proxy registration request, and further transmitted to the master power line communication apparatus. Existing power line communication equipment. A registration method for registering a newly added power line communication device in a power line communication network composed of existing power line communication devices, wherein the existing power lines are installed in the same house among the existing power line communication devices A determination step of determining whether or not a communication device exists based on transmission characteristics of a power line communication signal sent from the existing device, and when there is an existing power line communication device installed in the same house, A method for registering a power line communication apparatus, comprising: a step of performing registration by transmitting a registration request to an existing power line communication apparatus installed in the same house. The new power line communication device includes a beacon automatic gain control value (AGC value) measured while receiving a beacon periodically transmitted from a master device among the existing power line communication devices as the power line communication signal and a carrier pair. 20. The power line communication apparatus registration according to claim 19, further comprising the determination step of determining that the master apparatus is installed in the same house when interference / noise ratio values (CINR values) each satisfy a predetermined threshold. Method. When the AGC value and the CINR value of the beacon do not satisfy a predetermined threshold value of the AGC and the CINR value, a search request is transmitted by broadcast to all the existing power line communication devices, and the existing power line communication When the AGC value and CINR value of the search response measured while receiving the search response returned from the device as the power line communication signal each satisfy a predetermined threshold, the existing power line communication device is installed in the same house. The power line communication apparatus registration method according to claim 20, further comprising the determination step of determining that the power line communication device is present. When a beacon is not received from the master device, all existing power line communication devices are sent as transmission targets and a search request is transmitted by broadcast, and measurement is performed while receiving a search response returned from the existing power line communication device. The determination step of determining that the existing power line communication device is installed in the same house when the AGC value and the CINR value of the search response each satisfy a predetermined threshold value. Power line communication device registration method. The power line communication apparatus registration method according to claim 21 or 22, wherein when transmitting the search request, the search request is transmitted in several times while gradually increasing transmission power to search for an existing power line communication apparatus in the same house. 23. The determination step according to any one of claims 19 to 22, further comprising: determining that the same breaker is in the same house, the AGC maximum value in the same breaker is the AGC threshold value, and the CINR minimum value is the CINR threshold value. The power line communication apparatus registration method described. In registration with the new power line communication device, information for key generation is exchanged between the existing power line communication device and the new power line communication device, and the new power line communication is performed based on the exchanged information. The power line communication apparatus registration method according to claim 19, further comprising a key generation step of generating a unique encryption key of the apparatus. When an existing power line communication device receives a search request transmitted by broadcast from a newly added power line communication device, it returns a search response to the new power line communication device, and the new power line communication device itself When the registration request transmitted to the address is received, registration with the new power line communication device is performed. When the automatic gain control value (AGC value) and the carrier-to-interference / noise ratio value (CINR value) of the registration request measured while receiving the registration request from the new power line communication device each satisfy a predetermined threshold 27. The power line communication device registration method according to claim 26, further comprising a determination step of determining that the new power line communication device is installed in the same house, and performing registration with the new power line communication device. 28. The power line communication apparatus according to claim 27, further comprising: the determination step in which the same breaker is set in the same house, the AGC maximum value in the same breaker is set as the AGC threshold value, and the CINR minimum value is set as the CINR threshold value. Registration method. In the registration, information for key generation is exchanged between the existing power line communication device and the new power line communication device, and a unique encryption key for the new power line communication device is generated based on the exchanged information 27. The power line communication device registration method according to claim 26, further comprising key generation means for performing the operation. The existing power line communication device registered with the new power line communication device encrypts the identifier and the unique encryption key of the new power line communication device with its own encryption key, and stores it in the proxy registration request. 30. The power line communication device registration method according to claim 29, further comprising a step of transmitting the master power line communication device to perform main registration.

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