JP5098694B2 - Communication system and communication apparatus - Google Patents

Description

  The present invention relates to a communication system and a communication apparatus in which communication apparatuses having a wireless function communicate with each other, and more particularly, to perform communication by selecting one communication partner in an environment where a plurality of devices that can be communication targets exist. The present invention relates to a system and a communication device.

  More specifically, the present invention relates to a communication system and a communication apparatus that perform communication operations by specifying a communication partner without a user operation for specifying the communication partner, and in particular, a communication connection and communication according to the distance to the communication partner. The present invention relates to a communication system and a communication apparatus for controlling disconnection.

  A wireless network is attracting attention as a system free from wiring in the conventional wired communication system. For example, wireless LAN (Local Area Network) standards such as IEEE (The Institute of Electrical and Engineering Engineers) 802.11a, IEEE802.11b, or IEEE802.1g are typical.

  Recently, USB (Universal Serial Bus), which has been widely spread as a general-purpose bus interface standard for plug and play, has been expanded to combine wired safety, communication speed, and ease of use of radio. The specification of “Wireless USB” is USB Implementers Forum, Inc. (USB-IF) is being developed, and development of compatible devices is also underway.

  When trying to communicate between devices having this type of wireless communication function, if there are a plurality of devices that can become communication targets, communication is performed by selecting one communication partner.

  FIG. 11 shows a state in which communication is attempted between devices having a wireless communication function in a wireless LAN environment based on IEEE 802.11 or the like. In the figure, reference numerals 101 and 102 are wireless LAN access points, and reference numeral 103 is a personal computer (PC) equipped with a wireless LAN function. The user of the PC 103 can participate in the wireless LAN of a specific access point and start communication by setting communication software via an operation screen as indicated by reference numeral 104. A similar procedure is considered necessary for Wireless USB.

  However, when it is difficult for the user to specify the communication partner, such as the operation screen as described above, when a user interface that can display and easily specify the communication partner is not provided. It becomes difficult to select one communication partner and perform communication in an environment where there are a plurality of devices that can be communication targets.

  For example, the distance between other wireless devices within a communicable range is measured, and if a wireless communication device existing within a predetermined distance is found, a wireless connection with the wireless communication device is established, and A proposal has been made for a wireless communication device that disconnects a communication device when the communication device moves beyond a predetermined distance (see, for example, Patent Document 1). Assuming that the distance between devices implies the degree of communication, the communication control of connecting when the devices are close and disconnecting when the devices are close is intuitive and easy for the user to understand. However, it is assumed that the wireless communication apparatus has a ranging function such as UWB.

JP 2007-158447 A

  An object of the present invention is to provide an excellent communication system and communication apparatus capable of selecting one communication partner and performing communication appropriately in an environment where there are a plurality of devices that can be communication targets.

  It is a further object of the present invention to provide an excellent communication system and communication apparatus capable of suitably performing a communication operation by specifying a communication partner without a user operation for specifying the communication partner.

  A further object of the present invention is to provide an excellent communication system and communication apparatus capable of suitably controlling communication connection and disconnection according to the distance to the communication partner.

  The present invention has been made in consideration of the above problems,

A plurality of terminals each having a non-contact communication function;
A communication control device that includes an installation surface that performs non-contact communication by installing the plurality of terminals, and controls connection or disconnection of communication between the terminals according to a distance between the terminals installed on the installation surface;
It is a communication system characterized by comprising.

  However, “system” here refers to a logical collection of a plurality of devices (or functional modules that realize specific functions), and each device or functional module is in a single housing. It does not matter whether or not.

  When trying to communicate between devices having a wireless communication function, if there are a plurality of devices that can be communication targets, one communication partner is selected to perform communication.

  The communication system according to the present invention is configured to control connection and disconnection of communication according to the distance between terminals. Assuming that the distance between the terminals implies the degree of communication, the communication control of connecting when the terminals are close and disconnecting when the terminals are close is intuitive and easy for the user to understand. In addition, even if it is difficult for the user to specify the communication partner, such as when a user interface for displaying and specifying the communication partner is not provided, control the connection between the appropriate terminals. Is possible.

  For example, each of the plurality of terminals includes an electromagnetic coupling coil and can perform non-contact communication based on the electromagnetic coupling, and the communication control device can arrange the plurality of electromagnetic coupling coils two-dimensionally along the installation surface. It is arranged. And the communication control device detects the installation location of the terminal based on the position of the coil for electromagnetic coupling where the terminal installed on the installation surface and the electromagnetic coupling acts, and between the terminals based on the distance between the installation locations of each terminal It is possible to control connection or disconnection of communication.

  Since non-contact communication can send and receive signals only in the vicinity, the communication control device can determine each coil based on which coil and electromagnetic coupling have occurred without having a ranging means such as UWB. The location of the terminal can be detected. And based on the distance between the installation locations of each terminal, the terminal which can become a communication other party can be specified as a user's intention, and communication connection can be controlled.

  The communication control device can perform the following operations, for example, according to the distance between terminals installed on the installation surface.

(1) By bringing two terminals placed on the installation surface closer, communication between the terminals is established. Further, the communication between the terminals is disconnected by moving the terminals away.
(2) By bringing two terminals placed on the installation surface close simultaneously, communication between the terminals is established. Moreover, the communication between the said terminals is cut | disconnected by moving the said terminals away simultaneously.
(3) When two terminals placed on the installation surface are brought close to each other, when only one of the terminals is moved, communication between the terminals is established or disconnected.
(4) With two terminals placed on the installation surface, one terminal is moved within a specific range, thereby establishing communication between the terminals. Moreover, after communication is established between the two terminals placed on the installation surface, the communication between the terminals is disconnected by moving one terminal within a specific range.

  ADVANTAGE OF THE INVENTION According to this invention, the outstanding communication system and communication apparatus which can select one communication other party and can communicate suitably in the environment where multiple apparatuses which can become communication object exist can be provided.

  Furthermore, according to the present invention, it is possible to provide an excellent communication system and communication apparatus that can appropriately perform a communication operation by specifying a communication partner without a user operation for specifying the communication partner.

  According to the communication system according to the present invention, communication connection and disconnection can be suitably controlled according to the distance to the communication partner. That is, assuming that the distance between the devices implies the degree of communication, the communication control of connecting when the devices are close and disconnecting when the devices are close is intuitive and easy for the user to understand.

  In the communication system according to the present invention, communication between any two terminals can be easily established even when a plurality of terminals exist within the wireless communication range. In addition, the established communication can be easily disconnected.

  In addition, when establishing communication between terminals, there is no need for a selection operation by the user such as selection, so there is no need to equip each terminal with a display function or a user interface function, and the user can identify each terminal with an ID, etc. Need not be identified by Therefore, an ID for identifying each terminal becomes unnecessary, and manufacturing management of the terminal device becomes easy.

  In the communication system according to the present invention, each terminal is in a state that “the communication partner is not near” until the actual data communication is started. For this reason, it is not necessary to give the terminal a special state such as connection or disconnection of communication. In addition, the present invention can be realized without particularly changing each layer (PHY, MAC, upper application, etc.) of the communication protocol, and it is easy to maintain compatibility with conventional communication devices.

  Other objects, features, and advantages of the present invention will become apparent from more detailed description based on embodiments of the present invention described later and the accompanying drawings.

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

  Non-contact or proximity communication is known as a communication technique that does not use a communication cable. The contactless communication system includes a reader / writer that transmits an interrogation signal and a transponder that returns a response signal to the interrogation signal. The transponder is highly convenient because it simply returns the modulation to the unmodulated carrier from the reader / writer and does not have a carrier generation source, that is, it is not subject to radio regulations. Non-contact communication systems are classified into three types, a contact type (0 to 2 mm or less), a proximity type (0 to 10 cm or less), and a proximity type (0 to 70 cm or less) depending on the transmission distance. For example, either inductive coupling or electrostatic coupling is used for contactless contactless transmission. The latter electrostatic coupling method is a method of passing a signal using a small capacitance between electrodes as a coupler.

  In the following, description will be given of an operation in which the present invention is applied to a non-contact communication system and a communication operation is performed by specifying a communication partner without a user operation for specifying the communication partner.

  FIG. 1 shows an overview configuration of a communication system according to an embodiment of the present invention. The illustrated communication system includes a sheet 201 for electromagnetic coupling and a plurality of terminals 202 to 204 each having a wireless communication function by electromagnetic coupling.

  Each terminal 202 to 204 configured by a PC or the like operates as a transponder, and the electromagnetic coupling sheet 201 operates as a reader / writer, and non-contact communication based on the electromagnetic coupling action is possible. The terminals 202 to 204 are installed on the electromagnetic coupling sheet 201 and can communicate with each other through the electromagnetic coupling communication with the electromagnetic coupling sheet 201. Further, the electromagnetic coupling sheet 201 detects the positions where the terminals 202 to 204 are installed, and controls communication connection and disconnection according to the distance between the PCs. Details of connection control of communication between terminals by the electromagnetic coupling sheet 201 will be described later. In addition, it is preferable that the electromagnetic coupling sheet | seat 201 is a shape which can confirm the communication range of electromagnetic coupling communication visually.

  FIG. 2 shows an internal configuration example of the electromagnetic coupling sheet 201. As shown in the figure, the electromagnetic coupling sheet 201 is to switch the communication link in which combination of the coils 301 to 309 for electromagnetic coupling arranged on the two-dimensional array should be used for communication. A link / switch control unit 310 is provided. However, the gist of the present invention is not that the number of coils included in the electromagnetic coupling sheet 201 is limited to nine.

  FIG. 3 shows an internal configuration example of the link / switch control unit 310. The link / switch control unit 310 includes a transmission / reception unit 401 for each of the coils 301 to 309 and a communication control unit that controls a communication operation performed by each transmission / reception unit 401.

  The transmission / reception unit 401 includes a reception unit 403, a transmission unit 404, and a coupling unit 405 that couples a transmission wave and a reception wave.

  The communication control unit 402 includes a baseband processing unit 406, a CPU (Central Processing Unit) 407, and a ROM / RAM 408.

  The baseband processing unit 406 performs MAC (Media Access Control) processing such as framing, error detection, and retransmission in addition to the modulation / demodulation function of the transmission wave and the reception wave.

  The CPU 407 loads communication software from the ROM to the RAM and executes it. The communication software referred to here is in charge of processing for detecting data reception and routing to each of the coils 301 to 309. The following processing method is mentioned as a routing process.

(1) By bringing two terminals placed on the installation surface closer, communication between the terminals is established. Further, the communication between the terminals is disconnected by moving the terminals away.
(2) By bringing two terminals placed on the installation surface close simultaneously, communication between the terminals is established. Moreover, the communication between the said terminals is cut | disconnected by moving the said terminals away simultaneously.
(3) When two terminals placed on the installation surface are brought close to each other, when only one of the terminals is moved, communication between the terminals is established or disconnected.
(4) With two terminals placed on the installation surface, one terminal is moved within a specific range, thereby establishing communication between the terminals. Moreover, after communication is established between the two terminals placed on the installation surface, the communication between the terminals is disconnected by moving one terminal within a specific range.

  FIG. 4 shows an internal configuration example of the terminals 202 to 204. The illustrated terminal includes an electromagnetic coupling coil 501, a receiving unit 502, a transmitting unit 503, a coupling unit 504 that couples a transmission wave and a received wave, a baseband processing unit 505, and a function corresponding to each terminal. A terminal function unit 506 and an interface unit 507 between the terminal function unit 506 and the baseband processing unit 505 are provided. The baseband processing unit 505 performs MAC processing such as framing, error detection, and retransmission in addition to the modulation / demodulation function of the transmission wave and the reception wave. Further, although the terminal function unit 506 corresponds to a PC main body or the like, the function of the terminal is not directly related to the gist of the present invention, and thus description thereof is omitted in this specification.

  Subsequently, a communication operation performed on the electromagnetic coupling sheet 201 will be described.

  FIG. 5 shows a communication connection sequence example between the terminal 202 and the terminal 203.

  First, it is assumed that nothing exists on the electromagnetic coupling sheet 201. FIG. 6 shows an example of a protocol stack when communication between the terminal 202 and the terminal 203 is not connected.

  Beacon information is transmitted at regular intervals from the link / switch unit 310 of the electromagnetic coupling sheet to the coils 301 to 309. The beacon information transmission sequence is for determining whether a terminal is placed on the electromagnetic coupling sheet 201.

  Here, it is assumed that the terminal 202 is installed at a position on the coil 301 in the electromagnetic coupling sheet 201. The terminal 202 periodically receives a beacon from the coil 301 and transmits a response to the beacon to the electromagnetic coupling sheet 201 side. Since the operation principle of the terminal 202 as a transponder returning the response signal is well known, detailed description thereof is omitted here.

  Similarly, the other terminals 203 and 204 are installed at positions on the coils 307 and 309 in the electromagnetic coupling sheet 201, respectively, and periodically receive a beacon and respond thereto.

  In this state, the link switch unit 310 can grasp which coil each of the terminals 202 to 204 is transmitting / receiving, in other words, each of the terminals 202 to 204 is the installation surface of the electromagnetic coupling sheet 201. It is possible to specify the position on the top.

  In this state, none of the terminals 202 to 204 determines a communication partner. For example, even if the application data transmitted from the terminal 202 reaches the link switch unit 310 via the corresponding coil 301, there is no data transmission destination. Discarded.

  Here, the user moves the terminal 203 from the coil 307 to the coil 304. The terminal 203 transmits a response to the beacon to the electromagnetic coupling sheet 201 via the coil 304. The link switch unit 310 can detect that the terminal 203 has approached the terminal 202.

  The link switch unit 310 can recognize the movement of the terminal 203 as “the user is trying to make the terminal 202 and the terminal 203 communicate”. Thereafter, the application data transmitted from the terminal 202 reaches the link switch unit 310 via the coil 301 and is further transferred to the terminal 203 via the coil 304. FIG. 7 shows a protocol stack example when communication between the terminal 202 and the terminal 203 is not connected.

  According to the connection sequence illustrated in FIG. 5, the user can instruct communication between desired terminals by an intuitive operation of bringing devices to be communicated close to each other.

  FIG. 8 shows a communication disconnection sequence example between the terminal 202 and the terminal 203.

  Assume that the user moves the terminal 203 to a position on the coil 307 in a state where communication is connected between the terminal 202 installed on the coil 301 and the terminal 203 installed on the coil 304. .

  The terminal 203 transmits a response to the beacon to the electromagnetic coupling sheet 201 via the coil 307. The link switch unit 310 can detect that the terminal 203 has been moved away from the terminal 202.

  The link switch unit 310 can recognize the movement of the terminal 203 as “the user is trying to disconnect the terminal 202 and the terminal 203”. After that, the application data transmitted from the terminal 202 reaches the link switch unit 310 via the coil 301, and the hand discards the data at the link switch unit 310 so that the communication between the terminal 202 and the terminal 203 can be performed. Disconnect.

  According to the disconnection sequence illustrated in FIG. 7, the user can instruct communication between desired terminals by an intuitive operation of moving away devices to be disconnected.

  FIG. 9 is a flowchart showing a processing procedure for the link / switch unit 310 in the electromagnetic coupling sheet 201 to perform communication connection / disconnection between the terminals shown in FIGS. 5 and 8.

  First, various initializations are performed as necessary (step S1). Moreover, the timer for transmitting a beacon regularly is started (step S2).

  The link switch unit 310 always waits for four types of events (step S3).

  The first event is a beacon transmission timer event (step S4). This occurs when the timer set in step S2 times out, thereby creating and transmitting a beacon periodically (steps S5 and S6). Connection establishment information is added to the beacon using a connection table (described later). Then, after transmitting the beacon, the timer is restarted again (step S7).

  The second event is a data reception event (step S8). In this case, data is received from each terminal, but it is necessary to accept only data from a terminal in data communication. Therefore, it is determined whether the terminal ID exists in a connection table (described later), and it is determined whether the terminal is in data communication with another terminal (step S9). If data communication is in progress (Yes in step S9), the data is transmitted to the communication partner terminal (step S10). If data communication is not in progress (No in step S9), the data is discarded without being transmitted.

The third event is reception of a beacon response (step S11). This is to receive a beacon response from each terminal for the transmitted beacon.
When a beacon response is received, a beacon non-reception timer (n) is started (step S12). Here, (n) is a timer for each terminal. For example, when receiving beacon reception events from three terminals, three beacon no-reception timers are started.

  Here, in the case of a terminal that appears for the first time or a terminal that receives a different coil (that is, a terminal that has moved) (Yes in step S13), the contents of the terminal information table held in the link switch unit 310 are changed (step S14). ). The terminal information table stores the terminal ID and which position of the coils 301 to 309 the terminal is communicating with.

  Based on the terminal information table, it is determined whether or not the terminals are in a positional relationship of approaching or leaving (step S15). If the connection is changed as a result of the determination (Yes in step S15), the connection table is changed (step S16).

  The connection table stores the IDs of a pair of terminals that are connected and communicating. When the connection is established, the two established terminal IDs are registered in the connection table, and when the connection is disconnected, the corresponding two terminal IDs are deleted from the connection table.

  The fourth event is a timeout of the beacon non-reception timer (n) (step S17). When the timer time-out occurs, it indicates that the terminal existing on the electromagnetic coupling sheet 201 is out of the communication range. In this case, the corresponding terminal is deleted from the terminal information table (step S18), and when the terminal is establishing a connection (Yes in step S19), the communication pair with the corresponding terminal is deleted from the connection table (step S19). S20).

  FIG. 10 is a flowchart showing a processing procedure for the terminals 202 to 204 operating on the installation surface of the electromagnetic coupling sheet 201 to perform a communication operation.

  At the terminal, after various initializations are performed as necessary (step S31), beacon standby is started (step S32).

  Next, when the terminal is placed on the electromagnetic coupling sheet 201 and receives a beacon from the electromagnetic coupling sheet 201 (step S33), a beacon response is transmitted (step S34). The beacon response is transmitted including its own ID.

  Since the received beacon includes connection establishment information, it is checked (step S35). The connection establishment information includes a list of IDs of terminals that are currently established.

  Here, if the self ID is not included in the list (No in step S36), the process returns to step S33, and the beacon is continuously received.

  On the other hand, if the self ID is included in the list (Yes in step S36), it means that another terminal has requested establishment, and data communication is started.

  During data communication, a beacon non-reception timer (described later) is started (step S37). The beacon non-reception timer is a timer for detecting that its own terminal has left the electromagnetic coupling sheet.

  During data communication, it waits for four types of events.

  First, the first event is a beacon reception event (step S38). A beacon is periodically transmitted from the electromagnetic coupling sheet 201. Each time a terminal receives a beacon, it transmits a beacon response (step S40) to inform the link switch unit 310 of the electromagnetic coupling sheet 201 that its own terminal is in data communication.

  Simultaneously with the beacon response, the connection establishment information included in the beacon is checked (step S41), and it is detected that communication with the current communication partner is continuing. Here, when the communication with the current communication partner has been disconnected (Yes in step S42), the process returns to step S33, where the data communication is not performed and only beacon reception is started.

  Further, after receiving the beacon, the beacon non-reception timer is restarted (step S43).

  The second event is a data reception event (step S44). This is reception of data from the current communication partner, and the data is taken over to the upper layer of the terminal (step S45).

  The third event is a transmission request event from an upper layer (step S46). This is transmission data to the current communication partner, and data transmission processing is performed (step S47).

  The fourth event is a beacon non-reception timeout occurrence event (step S48). When this timer times out, it means that the timer has not been restarted because no beacon is received. Therefore, it is determined that the connection has been disconnected, and the process returns to step S33 to remove the beacon from the state during data communication. Start receiving only.

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiment without departing from the gist of the present invention.

  In the present specification, the embodiment applied to wireless communication by electromagnetic coupling of coils has been described, but the gist of the present invention is not limited to this. The present invention can be similarly applied to non-contact / proximity communication technology based on electrostatic coupling and other principles.

  Further, the wireless communication method between the seat and the terminal is not limited to the proximity communication such as electromagnetic coupling, and may be a wireless LAN function, for example. However, in order to detect the position of the terminal placed on the installation surface, it is necessary to sufficiently reduce the power of radio waves transmitted and received between the seat and the terminal and to have directivity.

  In short, the present invention has been disclosed in the form of exemplification, and the description of the present specification should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims should be taken into consideration.

FIG. 1 is a diagram showing an overview configuration of a communication system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an internal configuration example of the electromagnetic coupling sheet 201. FIG. 3 is a diagram illustrating an internal configuration example of the link / switch control unit 310. FIG. 4 is a diagram illustrating an internal configuration example of the terminals 202 to 204. FIG. 5 is a diagram illustrating an example of a communication connection sequence between the terminal 202 and the terminal 203. FIG. 6 is a diagram illustrating an example of a protocol stack when communication between the terminal 202 and the terminal 203 is not connected. FIG. 7 is a diagram illustrating an example of a protocol stack at the time of communication connection between the terminal 202 and the terminal 203. FIG. 8 is a diagram illustrating a communication disconnection sequence example between the terminal 202 and the terminal 203. FIG. 9 is a flowchart illustrating a processing procedure for the link / switch unit 310 in the electromagnetic coupling sheet 201 to perform communication connection / disconnection between the terminals illustrated in FIGS. 5 and 8. FIG. 10 is a flowchart showing a processing procedure for the terminals 202 to 204 operating on the installation surface of the electromagnetic coupling sheet 201 to perform a communication operation. FIG. 11 is a flowchart showing a state in which communication is attempted between devices having a wireless communication function in a wireless LAN environment based on IEEE 802.11 or the like.

Explanation of symbols

201 ... Electromagnetic coupling sheet 202-204 ... PC
301-309 ... Coil 310 ... Link / switch control unit 401 ... Transmission / reception unit 402 ... Communication control unit 403 ... Reception unit 404 ... Transmission unit 405 ... Coupling unit 406 ... Baseband processing unit 407 ... CPU
408 ... ROM / RAM
DESCRIPTION OF SYMBOLS 501 ... Coil 502 ... Reception part 503 ... Transmission part 504 ... Coupling part 505 ... Baseband process part 506 ... Terminal function part 507 ... Interface part

Claims (10)

A plurality of terminals each having a non-contact communication function;
A communication control device that includes an installation surface that performs non-contact communication by installing the plurality of terminals, and controls connection or disconnection of communication between the terminals according to a distance between the terminals installed on the installation surface;
Comprising
Each of the plurality of terminals includes a coil for electromagnetic coupling, and non-contact communication based on electromagnetic coupling is possible.
The communication control device two-dimensionally arranges a plurality of electromagnetic coupling coils along the installation surface, and a terminal based on the position of the terminal installed on the installation surface and the electromagnetic coupling coil on which electromagnetic coupling has acted Detecting the installation location of the terminal, and controlling the connection or disconnection of communication between the terminals based on the distance between the installation locations of each terminal,
A communication system characterized by the above. The communication control device connects communication between terminals whose installation locations are close on the installation surface, and disconnects communication between terminals whose installation locations are far away on the installation surface.
The communication system according to claim 1. The communication control device establishes communication between the terminals in response to the two terminals placed on the installation surface being brought close simultaneously, and performs communication between the terminals in response to moving the terminals away simultaneously. Disconnect,
The communication system according to claim 1 . The communication control device establishes or disconnects communication between the terminals when only one of the terminals is moved when the two terminals placed on the installation surface are brought close to each other.
The communication system according to claim 1 . The communication control device includes:
With two terminals on the installation surface, establish communication between the terminals by moving one terminal within a specific range,
After communication is established between the two terminals placed on the installation surface, the communication between the terminals is disconnected by moving one terminal within a specific range.
The communication system according to claim 1 . The communication system according to claim 1, wherein the communication apparatus operates as a communication control apparatus.
An installation surface on which multiple terminals can be installed;
A plurality of two-dimensionally arranged coils for electromagnetic coupling embedded in the installation surface;
A plurality of electromagnetic coupling coils are two-dimensionally arranged along the installation surface, and the terminal installation location is detected based on the position of the terminal installed on the installation surface and the electromagnetic coupling coil on which electromagnetic coupling has acted. A link switch unit that controls connection or disconnection of communication between terminals based on the distance between the installation locations of the terminals;
A communication apparatus comprising: The link switch unit connects communication between terminals whose installation locations are close to each other on the installation surface, and disconnects communication between terminals whose installation locations are far away on the installation surface.
The communication apparatus according to claim 6 . The link switch unit establishes communication between the terminals when the two terminals placed on the installation surface are brought close to each other simultaneously, and communicates between the terminals when the terminals are moved away simultaneously. Cutting,
The communication apparatus according to claim 6 . The link switch unit establishes or disconnects communication between the terminals when moving only one of the terminals when the two terminals placed on the installation surface are brought close to each other.
The communication apparatus according to claim 6 . The link switch unit is
With two terminals on the installation surface, establish communication between the terminals by moving one terminal within a specific range,
After communication is established between the two terminals placed on the installation surface, the communication between the terminals is disconnected by moving one terminal within a specific range.
The communication apparatus according to claim 6 .