JP2017092935A - Communication system, information processing device, communication terminal, communication method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and method capable of disconnecting communication with an information processing device at a timing which is specified by a communication terminal and thereby reducing the time during which another communication terminal cannot communicate with the information processing device.SOLUTION: The communication system performs communication between a communication terminal and an information processing device. The information processing device includes: a request reception unit that receives a request to transmit a disconnection request for disconnecting communication to the communication terminal; an instruction unit 65 that receives the request and instructs the communication terminal to transmit the disconnection request; and a communication unit 60 that receives the instruction and transmits the disconnection request to the communication terminal. The communication unit 60 receives a response to the disconnection request from the communication terminal and disconnects communication with the communication terminal.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a communication system that performs communication between a communication terminal and an information processing apparatus, an information processing apparatus and a communication terminal used in the communication system, a communication method, and a program for causing a computer to execute the processing.

  An information processing apparatus such as a smart device or an information processing apparatus such as a server is implemented with an operating system (OS) as software for performing basic functions and control of the device. The OS has basic functions commonly used by many software such as drivers and applications. For that OS, an API (Application Programming Interface) that defines procedures for calling and using the basic functions is disclosed and provided. As a result, the software developer can create software only by writing a program that calls the functions of the OS according to the API.

  One of the functions of the OS is establishment of a wireless communication connection and disconnection of the connection. Regarding the disconnection of the connection, a technique has been proposed in which the automatic disconnection determination time can be arbitrarily set according to the situation when the connection is automatically disconnected when the radio wave environment deteriorates (for example, Patent Document 1). reference).

  A manufacturer that develops hardware of a device that performs communication using Bluetooth (registered trademark), which is one of wireless communications, has a practice of developing software and protocol stacks to be installed in the device. Here, the protocol stack is one in which communication protocols are stacked in a hierarchical manner and the communication functions are realized by linking them. According to this convention, it is possible to develop and introduce a unique control packet as in the above technique.

  However, at present, representative manufacturers have developed and provided operating systems such as Android (registered trademark) and iOS (registered trademark) that absorb the model-dependent differences between smart devices. It is no longer possible to freely control the hardware and protocol stack.

  For this reason, even if an API is executed from a smart device application, the hardware and protocol stack cannot be freely controlled, and a disconnection request is not immediately sent from the smart device due to the design of the OS. . In this case, when it is desired to disconnect the communication established with the information processing apparatus that is the communication partner, it cannot be disconnected, and there is a problem that a time during which another smart device cannot communicate with the information processing apparatus occurs. was there.

  Therefore, it is desired to provide a system, a method, and the like that can disconnect communication with the information processing apparatus at a timing designated by the communication terminal and reduce the time during which other communication terminals cannot communicate with the information processing apparatus. It was.

  The present invention has been made in view of the above problems, and is a communication system that performs communication between a communication terminal and an information processing apparatus, and the information processing apparatus issues a disconnection request for disconnecting communication to the communication terminal. A request reception unit that receives a request to be transmitted, an instruction unit that receives the request and instructs the communication terminal to transmit a disconnection request, and receives an instruction from the instruction unit and transmits a disconnection request to the communication terminal A communication unit is provided, and the communication unit receives a response to the disconnection request from the communication terminal and disconnects communication with the communication terminal.

  ADVANTAGE OF THE INVENTION According to this invention, communication with an information processing apparatus can be cut | disconnected at the timing designated by the communication terminal, and the time when another communication terminal cannot communicate with an information processing apparatus can be shortened.

The figure which showed the structural example of the communication system of this embodiment. The figure explaining the process which cut | disconnects the communication established by Bluetooth (trademark). The figure which showed the hardware constitutions of the smart device as a communication terminal with which a communication system is provided. 1 is a diagram illustrating a hardware configuration of an image forming apparatus as an information processing apparatus included in a communication system. The block diagram which showed the function structure of the smart device. FIG. 2 is a block diagram illustrating a functional configuration of the image forming apparatus. FIG. 3 is a diagram illustrating a configuration of a database for cutting processing held by an image forming apparatus. The figure which showed the information written in a database. The sequence diagram which showed 1st Embodiment of the process which a communication system performs. The sequence diagram which showed 2nd Embodiment of the process which a communication system performs. The sequence diagram which showed 3rd Embodiment of the process which a communication system performs. The sequence diagram which showed 4th Embodiment of the process which a communication system performs. The figure demonstrated more concretely in light of the specific use case which a communication system performs.

  FIG. 1 is a diagram illustrating a configuration example of a communication system according to the present embodiment. The communication system includes a smart device 10 as a communication terminal and an image forming apparatus 11 as an information processing apparatus that performs wireless communication with the smart device 10. In FIG. 1, the image forming apparatus 11 is connected to a network 12 such as a LAN (Local Area Network) or the Internet and has only one smart device 10 that performs wireless communication with the image forming apparatus 11. It is not limited. Therefore, the image forming apparatus 11 may not be connected to the network 12, and the smart device 10 may be two or more. Also, the image forming apparatus 11 may be two or more. The network 12 may be a wired network or a wireless network, and is not limited to a single network, but may be a network in which two or more networks are connected by a router or the like.

  The smart device 10 is connected to the image forming apparatus 11 by wireless communication, and has an application, an OS, and an API for instructing job execution such as printing and scanning. As the smart device 10, a smart phone, a tablet terminal, a smart watch, a smart glass, a PDA (Personal Digital Assistant), or the like can be used. Smart watches, smart glasses, and the like are called wearable terminals because they are worn by users. Here, the smart device 10 is taken as an example, but the present invention is not limited to this, and a notebook PC or other communicable device may be used.

  Wireless communication may be any of infrared communication, Bluetooth (registered trademark), and wireless LAN, but here, wireless communication is performed using Bluetooth (registered trademark) Low Energy (BLE) added in Bluetooth (registered trademark) 4.0. It is assumed that The Bluetooth (registered trademark) may be a PAN (Personal Area Network) wireless medium such as so-called classic Bluetooth (registered trademark) before Bluetooth (registered trademark) 3.x.

  Incidentally, BLE is a standard for performing power-saving communication, and the connection of the communication is defined by GAP (Generic Access Profile) of Bluetooth (registered trademark) SIG (Special Interest Group) that defines connection rules.

  The image forming apparatus 11 receives a print or scan instruction from the smart device 10 by wireless communication, and performs printing or image reading. As the image forming apparatus 11, a printer, a scanner, a fax machine, a copier, an MFP (Multi-Function Peripheral) that implements these functions, or the like can be used. Here, an example in which the image forming apparatus 11 is used as an information processing apparatus is shown, but the present invention is not limited to this, and a server, a PC, a projector, an electronic blackboard, a digital camera, a 3D printer, or the like may be used.

  The user uses the smart device 10 to activate an application installed in the smart device 10, open an image to be printed or scanned, and instruct printing or scanning of the image. The smart device 10 establishes a connection with the image forming apparatus 11 by wireless communication, transmits image data of the image to the image forming apparatus 11 and requests printing or scanning. The image forming apparatus 11 receives the image data and the request, and executes printing or scanning of the image data.

  The smart device 10 requests the image forming apparatus 11 to perform printing or scanning, and performs processing of automatically disconnecting the connection when all the processing to the image forming apparatus 11 is completed. Note that the process of disconnecting the connection can also be performed by the user instructing disconnection of the communication established between the smart device 10 and the image forming apparatus 11 after the printing or scanning is completed. In this case, the smart device 10 and the image forming apparatus 11 can execute a process of disconnecting the connection in response to the instruction.

  Here, with reference to FIG. 2, a process of disconnecting the connection between the Bluetooth (registered trademark) compatible devices will be described. FIG. 2A is a diagram showing processing when the application layer that is the upper layer of the protocol stack implemented in one device, that is, the host A requests disconnection. FIG. 2B is a diagram showing a process when the host B of the protocol stack mounted on another device of the communication partner of the host A requests disconnection. In these drawings, one device has a host A and a link layer (LL) A which is a lower layer thereof, and the other device has a host B and a link layer B. For example, one device is the smart device 10 and the other device is the image forming apparatus 11.

  In the process shown in FIG. 2A, the host A requests the link layer A to disconnect the connection (S1), and the link layer A responds to the request (S2). The link layer A transmits an LL_TERMINATE_IND packet to the link layer B as a connection disconnection request (S3). The link layer B receives the disconnect request and responds to the link layer A with an LL ack packet (S4). In response to this response, the connection is disconnected, and the link layer B notifies the host B that the disconnection has been completed (S5). Similarly, the link layer A notifies the host A that the disconnection has been completed (S6).

  In the process shown in FIG. 2B, the host B requests the link layer B to disconnect (S1), and the link layer B responds to the request (S2). The link layer B transmits a connection disconnection request to the link layer A (S3). The link layer A receives the disconnection request and responds to the link layer B with an LL ack packet (S4). In response to this response, the connection is disconnected, and the link layer A notifies the host A that the disconnection has been completed (S5). Similarly, the link layer B notifies the host B that the disconnection is completed (S6).

  The user uses the smart device 10 to determine the disconnection of the connection between the smart device 10 and the image forming apparatus 11 and instructs it. For this reason, the process for disconnecting the connection is as shown in FIG. However, even when an API is actually executed from an application mounted on the smart device 10, a disconnection request from a basic part (platform) such as an OS or hardware may not be transmitted to the image forming apparatus 11 at an intended timing. . This is because the manufacturer that develops the platform is different from the manufacturer that develops the software such as the application as described above, and the application cannot control the hardware and protocol stack constituting the platform. In the present embodiment, the platform means an information processing terminal that operates on iOS, ANDROID, CHROME, or other operating system (OS). More specifically, the platform of the present embodiment means a functional unit having a communication function. For example, in iOS, an API for disconnecting the connection state from the connection source to the connection destination is released, but even if the API is executed, the connection state remains for about 30 seconds, and as a result the connection destination is another smart device There is a time that cannot be connected. The table below summarizes whether the timing of API execution for each BLE command on iOS and the actual transmission timing are so different that it can cause problems in actual operation.

  In this case, communication with the image forming apparatus 11 cannot be disconnected at a timing designated by the user and designated by the application, and a time during which other smart devices cannot communicate with the image forming apparatus 11 occurs. It will become.

  Compared to the transmission of this disconnection request, the communication unique to the application layer, for example, data transmission / reception can be performed at a timing intended by the application. For this reason, this communication system is configured to transmit any data from the smart device 10 to the image forming apparatus 11 and to transmit a disconnection request from the image forming apparatus 11, and perform the disconnection process shown in FIG. Realize. This is because the image forming apparatus 11 has the same manufacturer that develops the platform and software, and thus the above problem does not occur.

  As a result, communication can be disconnected at the timing intended by the application of the smart device 10, and the time during which no other smart device can use the image forming apparatus 11 can be reduced.

  The hardware configuration and functional configuration of the smart device 10 and the image forming apparatus 11 for realizing this will be described with reference to FIGS. FIG. 3 is a diagram illustrating a hardware configuration of the smart device 10. The smart device 10 has the same configuration as a general communication terminal such as a smartphone. That is, the smart device 10 includes a central processing unit (CPU) 20, a random access memory (RAM) 21, a read only memory (ROM) 22, a hard disk drive (HDD) 23, an I / F 24, and a display device. 25, an input device 26, and wireless communication media 27 and 28.

  The CPU 20 is a calculation unit and controls the entire smart device 10. The RAM 21 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 20 processes information. The ROM 22 is a read-only nonvolatile storage medium and stores a boot program, firmware, and the like for starting the smart device 10. The HDD 23 is a non-volatile storage medium that can read and write information, and stores an OS, various control programs, applications, and the like.

  The I / F 24 connects the bus 29 to various hardware, a network, and the like, and controls various hardware and the like. The display device 25 is an LCD (Liquid Crystal Display), for example, and is a visual interface for the user to check the state of the smart device 10. The input device 26 is a user interface for the user to input information to the smart device 10 using, for example, a keyboard or a mouse. Here, the display device 25 and the input device 26 are described as separate devices, but a touch panel having both functions may be employed.

  The wireless communication medium 27 is a Bluetooth (registered trademark) transceiver that can be controlled from an application, and the wireless communication medium 28 is a Wi-Fi transceiver that is different from the wireless communication medium 27. As the wireless communication medium 27, a wireless medium of Bluetooth (registered trademark) 4.0 can be used, but even a PAN wireless medium such as a so-called classic Bluetooth (registered trademark) of Bluetooth (registered trademark) 3.x or earlier can be used. Good. As the wireless communication medium 28, a wireless medium such as Wi-Fi defined by the IEEE802.11 standard can be used.

  FIG. 4 is a diagram illustrating a hardware configuration of the image forming apparatus 11. The image forming apparatus 11 is configured by connecting a controller 30 and an engine unit 40 via a PCI (Peripheral Component Interface) bus 41. The controller 30 controls the entire image forming apparatus 11, drawing, communication, and input of information from the operation unit 42. The engine unit 40 is a printer engine or the like that can be connected to the PCI bus 41, and is, for example, a monochrome plotter, a one-drum color plotter, a four-drum color plotter, a scanner, or a fax unit. The engine unit 40 includes an image processing unit that performs error diffusion, gamma conversion, and the like in addition to these plotters.

  The controller 30 includes a CPU 31, a north bridge (NB) 32, a system memory (MEM-P) 33, a south bridge (SB) 34, and a local memory (MEM-C) 35. The controller 30 includes an ASIC (Application Specific Integrated Circuit) 36 and an HDD 37, and the NB 32 and the ASIC 36 are connected by an AGP (Accelerated Graphics Port) bus 38. The MEM-P 33 includes a ROM 33a and a RAM 33b.

  The CPU 31 controls the entire image forming apparatus 11, has a chip set composed of NB 32, MEM-P 33, and SB 34, and is connected to other devices via this chip set. The NB 32 is a bridge for connecting the CPU 31 to the MEM-P 33, the SB 34, and the AGP bus 38, and includes a memory controller that controls reading and writing to the MEM-P 33, a PCI master, and an AGP target. The PCI master is a device that performs data transfer, and the AGP target is a device that receives the data transfer.

  The MEM-P33 is used as a memory for storing programs and data, as a memory for reading out and developing the programs and data, and as a memory for drawing used when performing drawing processing. Is done. The ROM 33a is a read-only memory used as a memory for storage. The RAM 33b is a memory capable of both writing and reading, which is used as a development memory and a drawing memory.

  The SB 34 is a bridge for connecting the NB 32 to the PCI bus and peripheral devices. The SB 34 is connected to the NB 32 via a PCI bus, and a network interface (I / F) unit and the like are also connected to the PCI bus. The MEM-C 35 is used as a copy image buffer for temporarily storing image data for copying, and as a code buffer for temporarily storing when encoding.

  The ASIC 36 is an integrated circuit (IC) for image processing and serves as a bridge for connecting the AGP bus 38, the PCI bus 41, the HDD 37, and the MEM-C 35, respectively. The ASIC 36 includes a PCI controller and an AGP target, a memory controller that controls the ARB (Arbiter) that forms the core of the ASIC 36, and the MEM-C 35, and a plurality of DMACs (Direct Memory) that rotate image data using hardware logic. Access Controller) and a PCI unit that performs data transfer via the PCI bus 41 between the engine unit 40.

  An FCU (Facsimile Control Unit) 43, a USB (Universal Serial Bus) 44, and an IEEE1394 (the Institute of Electrical and Electronics Engineers 1394) interface 45 are connected to the ASIC 36 via a PCI bus 41. Similarly to the smart device 10, wireless communication media 46 and 47 are connected to the ASIC 36. The wireless communication medium 46 is a wireless medium that can be controlled from an application such as a Bluetooth (registered trademark) 4.0 transceiver. This is also a PAN wireless medium such as a so-called classic Bluetooth (registered trademark) before Bluetooth (registered trademark) 3.x. It may be. The wireless communication medium 47 is a wireless medium such as a Wi-Fi transceiver that is different from the wireless communication medium 46.

  The HDD 37 is a non-volatile storage medium that stores image data, programs, font data, forms, and the like. The HDD 37 also stores a license file for an application executed on the image forming apparatus 11. Although the HDD 37 is used here, an SSD (Solid State Drive) may be used. The AGP bus 38 is a bus interface for a graphic accelerator card proposed for speeding up graphic processing. The AGP bus 38 increases the speed of the graphic accelerator card by directly accessing the MEM-P 33 with high throughput.

  The operation unit 42 is directly connected to the ASIC 36 and displays information input from the user, a job processing status of the image forming apparatus 11, and the like to the user. The operation unit 42 may be configured to include a display unit and input buttons, or may be an operation panel including a touch panel.

  FIG. 5 is a functional block diagram of the smart device 10. The smart device 10 includes a communication unit 50, a communication management unit 51, a request output unit 52, a time determination unit 53, an encoding unit 54, and a decoding unit 55. The communication unit 50 in the present embodiment provides a function corresponding to the platform defined in this specification. The request output unit 52, the time determination unit 53, the encoding unit 54, and the decoding unit 55 are realized by the CPU 20 executing an application stored in the HDD 23. The communication unit 50 and the communication management unit 51 are realized by the I / F 24 and the wireless communication media 27 and 28 and a wireless communication protocol stack provided by the platform.

  In response to an instruction from the user, the request output unit 52 outputs a connection request for connecting to the image forming apparatus 11 by wireless communication. When the communication management unit 51 receives a connection request from the request output unit 52, the communication management unit 51 instructs the communication unit 50, and the communication unit 50 executes a connection process for the device address specified in the connection request.

  In the actual BLE, an LE Create Connection command is issued from the application layer (host) in the protocol stack of the smart device 10 to the link layer. The communication management unit 51 is realized by this host, and the communication unit 50 is realized by a link layer. In response to this, the link layer transmits a CONNECTION_REQ packet as a connection request to the image forming apparatus 11 at the device address. Thereafter, the connection parameters are exchanged with the image forming apparatus 11, and when the connection is completed, the link layer of the smart device 10 notifies the host of an LE Connection Complete event.

  While being connected to the image forming apparatus 11, the request output unit 52 outputs a read request or a write request for reading and writing information to the image forming apparatus 11. When the communication unit 50 receives a read request or a write request from the request output unit 52 via the communication management unit 51, the communication unit 50 executes a procedure specified by the request.

  If this is also described in BLE, the application executes the API to make the request, and the protocol stack executes the procedure specified by the request. Each procedure reads and writes GATT Characteristic values of GATT Service based on the GATT profile. Here, the profile indicates what each device can do using Bluetooth (registered trademark). GATT Service is a list of functions (services) that the image forming apparatus 11 has. The Characteristic value is a value of data constituting the service. In BLE, the smart device 10 communicates with the image forming apparatus 11 by reading and writing the above GATT Characteristic value. Reading and writing GATT Characteristic values of GATT Service can be realized using the API of each platform as a subprocedure.

  In reading and writing of this GATT Characteristic value, it is possible to encode the data that is the value and to decode the encoded data. The communication standard has an encoding function, but the encryption option cannot be used particularly when connecting to a device without pairing with BLE. For this reason, it can be encoded or decoded in the application. The smart device 10 can include an encoding unit 54 for encoding and decoding, and a decoding unit 55 for decoding. The encoding unit 54 encodes, that is, encrypts information such as a connection request and a read / write request transmitted to the image forming apparatus 11, and the decrypting unit 55 decrypts the encrypted information received from the image forming apparatus 11. . The encryption algorithm for encoding may be any algorithm.

  The request output unit 52 can output a disconnection request for disconnecting the connection when reading / writing with the image forming apparatus 11 is completed and the connection becomes unnecessary. The communication unit 50 can receive the disconnect request via the communication management unit 51 and transmit it to the image forming apparatus 11. However, since the above problem occurs in wireless communication using Bluetooth (registered trademark), the following request is output and transmitted instead of the disconnection request.

  When the connection becomes unnecessary, the request output unit 52 outputs a request for transmitting a disconnection request for disconnecting the connection to the smart device 10. This request is, for example, a request to write a time (for example, a numerical value indicating the number of seconds) until the connection is disconnected to a specific location of the image forming apparatus 11. Note that the information to be written is not limited to the time, but may be an instruction that indicates a predetermined disconnection immediately. In BLE, a request is made to write the above time and instruction in a predetermined GATT Characteristic of the image forming apparatus 11. The above instruction may be written in another place such as a GATT Descriptor. GATT Characteristic is in a database called GATT Service held by the application corresponding to the GATT profile used in BLE, and the value is stored as data. The communication unit 50 transmits a write request for writing the time and the like to the image forming apparatus 11 to execute the writing of the time and the like.

  The communication unit 50 receives the disconnection request because the disconnection request is transmitted immediately after the time written from the image forming apparatus 11 by the above write request has elapsed or without measuring the time. The communication unit 50 returns a response to the disconnection request. In BLE, since the LL_TERMINATED_IND packet is transmitted as a disconnection request from the image forming apparatus 11, the LL_TERMINATED_IND packet is received, and the link layer of the protocol stack returns an LLack packet as a response. Thereafter, the link layer notifies the host of a Disconnection Complete event, and the disconnection process is completed. For this reason, the communication unit 50 can notify the communication management unit 51 that the disconnection process has been completed.

  The time determination unit 53 predicts the communication time with the image forming apparatus 11 when the request output unit 52 outputs the write request for the time, and determines how much time the time is to be used. For example, when the number of times of communication from the smart device 10 to the image forming apparatus 11 is 3 and one communication is completed in about 3 seconds, the time determination unit 53 sets the time until writing and cutting the time to 3 × 3 = It is predicted to be 9 seconds, and is determined to be 10 seconds with an allowance of 9 seconds or 1 second. The value to be written may be either 9 seconds or 10 seconds as described above, but an arbitrary value (in this case, 1 second) that gives a time margin is added so as to be disconnected after the communication has been completed three times. It is desirable to make it a value.

  The communication time can be estimated as the time required for the remaining reading and writing. The number of times of communication can be determined based on the number of times that reading and writing are necessary, and the time required for one communication can be obtained on average from the history of communication performed so far, and that time can be adopted. it can. Since these are examples, the time may be predicted by other methods. Further, the above arbitrary value is not limited to the above 1 second, and may be another value such as 0.5 second or 2 seconds.

  The request output unit 52 can generate and output a request to write the time determined by the time determination unit 53 as a write request. However, after the communication unit 50 transmits the write request to the image forming apparatus 11, You may want to change For example, there is a case where the communication frequency is considered to be disconnected after 10 seconds, which is 3 times later, but it is desired to immediately disconnect.

  In such a case, the request output unit 52 outputs a cancel request in order to cancel transmission of the disconnection request after the time designated by the writing has elapsed. The cancel request is a request for writing a numerical value as cancel information in a specific place of the image forming apparatus 11 as in the case of the write request. The numerical value may be any numerical value other than a numerical value that can be measured as the designated time. This is because such a numerical value cannot measure time. For example, it can be a negative value such as 0 (zero) or -1. The specific location can be overwritten with the same location as previously written. Note that if the above-described instruction indicating immediate disconnection is realized by writing 0, the cancellation information can be a negative value.

  FIG. 6 is a functional block diagram of the image forming apparatus 11. The image forming apparatus 11 includes a communication unit 60, a communication management unit 61, a read / write processing unit 62, a storage unit 63 as the database, a measurement unit 64, and an instruction unit 65 as functional units. Is done. The communication unit 60 provides a function corresponding to the platform defined in this specification. A write request such as time is received from the smart device 10 and is passed to the read / write processing unit 62 via the communication management unit 61.

  In FIG. 6, the communication unit 60 also has a function as a request reception unit that receives a write request, but the request reception unit may be configured as a separate function unit. The read / write processing unit 62 writes and stores the requested time and the above instruction in a specific location of the storage unit 63 as information related to the transmission of the disconnection request. Then, the read / write processing unit 62 notifies the instruction unit 65 that the writing has been completed. Hereinafter, writing will be described as time only.

  The measuring unit 64 receives an instruction from the instruction unit 65, refers to the time stored in a specific place in the storage unit 63, starts measuring time, and when the time has been reached, Notify that the time has been reached. In response to the notification, the instruction unit 65 generates a disconnection request for disconnecting the connection from the smart device 10 and instructs the communication management unit 61 to transmit the disconnection request. The communication management unit 61 receives the disconnection request, instructs the communication unit 60, and the communication unit 60 transmits the disconnection request to the smart device 10.

  The smart device 10 receives the disconnection request and returns a response, but the communication unit 60 receives the response and executes processing for disconnecting communication with the smart device 10. In the process of disconnecting communication, the connection parameters exchanged at the time of connection with the smart device 10 are discarded.

  In fact, in BLE, when the protocol stack of the image forming apparatus 11 receives a CONNECT_REQ packet as a connection request from the smart device 10, the connection parameters are exchanged with the smart device 10. When the connection is completed by this exchange, the LE Connection Complete event is notified from the link layer to the host, and the application is notified via the API. When receiving a request for reading / writing information from the smart device 10, the protocol stack responds to reading / writing of a database held by the application via the API. In BLE, GATT Characteristic values are read and written. When reading / writing is completed, GATT Characteristic Read / Write Response is returned, and the smart device 10 is notified of the result.

  When reading and writing, data to be read and written may be encoded. The read data can be encoded and transmitted to the smart device 10, and for this purpose, an encoding unit 66 can be further provided. In addition, a decoding unit 67 may be further included to decode the encoded data transmitted from the smart device 10.

  When a disconnection request is transmitted from the smart device 10, the protocol stack returns a disconnection response to the smart device 10. Then, the protocol stack notifies the application that the disconnection is completed via the API.

  More specifically, when the LL_TERMINATED_IND packet is transmitted from the smart device 10 and received by the protocol stack, the link layer of the protocol stack transmits the LL ack packet to the smart device 10. Then, the link layer notifies the host of an LE Disconnection Complete event. The host notifies the application that the disconnection is completed via the API, whereby the disconnection process is completed.

  The processing when the disconnection request is transmitted from the smart device 10 is as described above. However, depending on the platform, the disconnection request is not transmitted immediately. Therefore, when disconnecting, the smart device 10 transmits a request to write time. . The image forming apparatus 11 writes the time in a predetermined place in accordance with the write request, and keeps a timer for the written time. Then, the image forming apparatus 11 executes a disconnection API at the timing when the timer is fired, and transmits a disconnection request from the protocol stack to the smart device 10. Specifically, an LL_TERMINATE_IND packet is transmitted from the link layer of the protocol stack to the smart device 10.

  When the LLack packet is returned from the smart device 10, the link layer of the protocol stack notifies the host of an LE Disconnection Complete event. The host notifies that the disconnection has been completed via the API, thereby completing the disconnection process.

  A case will be described in which a cancel request is transmitted from the smart device 10 to the image forming apparatus 11 and a value for canceling is written in a specific location when the timer has already been timed. In this case, the disconnection process operated by the timer firing is invalidated by writing the value to cancel. Therefore, it can be canceled by this writing, and when a new time is set, it can be realized by writing a new value after the cancellation.

  A database that is the storage unit 63 to which the read / write processing unit 62 performs writing will be described with reference to FIG. In BLE, GATT Service can define characteristics and behavior in a form that includes multiple GATT Characteristics. Here, GATT Service is defined as a unique disconnection service. Each of the plurality of Characteristics has an ID as its value. Actually, the GATT Characteristic has a property indicating a value or behavior, a permission indicating an authority, etc., but in FIG. 7, it is shown as one logical unit.

  When making a disconnection request from the smart device 10 to the image forming apparatus 11, an application of the smart device 10 is required to write an appropriate value in the database. For this reason, as shown in FIG. 7, an ID and a timer time that can be divided into a plurality of GATT Characteristics are defined as one GATT Characteristic. This is because if the GATT Characteristic is divided into a plurality of times, the writing process occurs a plurality of times, it takes a communication time, and the communication speed decreases. If neither communication speed nor communication time is a problem, ID and timer time may be defined separately as a plurality of GATT Characteristics.

  The ID is determined as a unique value with no collision calculated by the hash function or the like of the smart device 10 when the smart device 10 requests the disconnection process. This value is used when determining which cutting process to cancel when canceling the cutting process. Note that the timer time is the time until the disconnection process is started, which is written when the disconnection process is requested from the smart device 10.

  A specific value to be written will be described with reference to FIG. In FIG. 8, the ID is identification information for identifying the timer. In FIG. 8A, a value of 1 is written in association with ID 0x0024 so that the timer with ID 0x0024 is disconnected after 1 second. In FIG. 8B, a value of 10 is written in association with ID 0x0051 so that the timer with ID 0x0051 is disconnected after 10 seconds.

  In FIG. 8C, the value “0” is written again to cancel the disconnection request to the timer having the same ID of 0x0051. A value of 0 is a value that disables timing by the timer. When a value of 0 is written as information for immediately transmitting a disconnection request, a negative value can be used as a value for invalidating the time count by the timer.

  With reference to the sequence diagram shown in FIG. 9, processing for disconnecting the connection between the smart device 10 and the image forming apparatus 11 executed by the communication system will be described based on the BLE command specifications. The smart device 10 includes a communication unit 50, a communication management unit 51, and a request output unit 52, and the image forming apparatus 11 includes a communication unit 60, a communication management unit 61, a read / write processing unit 62, a measurement unit 64, and an instruction unit 65. It will be explained as a thing.

  The request output unit 52 receives, for example, a connection disconnection instruction from the user, generates a write request for the time determined by the time determination unit 53 (not shown), and outputs the request to the communication management unit 51 (S1). The communication management unit 51 outputs the write request as a GATT Characteristic Write Request command to the communication unit 50 (S2). The communication unit 50 converts it into an Attribute Write Request packet and transmits it to the image forming apparatus 11 (S3). Note that if the maximum transmission unit (MTU), which is the maximum amount of data that can be transferred at one time, is set to a small value according to the connection parameter, the packet is divided and transmitted. In this case, the receiving side combines the divided packets and reconstructs them.

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Write Request packet, converts it into an abstracted GATT Characteristic Write Request command, and outputs it to the communication management unit 61 (S4). The communication management unit 51 outputs the command as a write request to the read / write processing unit 62 (S5). The read / write processing unit 62 writes and sets the time required by the write request in a specific location of the storage unit 63 (S6). Then, the read / write processing unit 62 notifies the instruction unit 65 that the time writing has been completed (S7). The instruction unit 65 instructs the measuring unit 64 to start measuring time (S8), and the measuring unit 64 receives the instruction and starts measuring time (S9).

  The read / write processor 62 also notifies the communication manager 61 that the writing has been completed (S10). The communication management unit 61 returns to the communication unit 60 that the writing has been completed as a GATT Characteristic Write Response event (S11). The communication unit 60 converts the GATT Characteristic Write Response event into an Attribute Write Response packet and responds to the smart device 10 (S12).

  The communication unit 50 receives the Attribute Write Response packet from the image forming apparatus 11, converts it into a GATT Characteristic Write Response event, and returns it to the communication management unit 51 (S13). The communication management unit 51 returns a GATT Characteristic Write Response event as a write result to the request output unit 52 (S14). The request output unit 52 can notify the user of the result by, for example, displaying the writing result on the display unit.

  When the time written in the storage unit 63 is reached, the measuring unit 64 notifies the instruction unit 65 that the time has been reached (S15). The instruction unit 65 generates a request for disconnecting the connection with the smart device 10, and outputs the disconnection request to the communication management unit 61 to instruct disconnection (S16). The communication management unit 61 outputs the disconnection request as the LE_Disconnect command to the communication unit 60 (S17). The communication unit 60 converts the LE_Disconnect command into an LL_TERMINATE_IND packet and transmits it to the smart device 10 (S18).

  When receiving the LL_TERMINATE_IND packet, the communication unit 50 of the smart device 10 returns an LL ack packet as a response (S19). Upon receiving the LLack packet, the communication unit 60 of the image forming apparatus 11 converts it into an LE_Disconnection Complete event and outputs it to the communication management unit 61 (S20). The communication management unit 61 responds to the instruction unit 65 as a notification that the disconnection is completed for the LE_Disconnection Complete event (S21).

  Further, the communication unit 50 of the smart device 10 converts the received LL_TERMINATE_IND packet into an LE_Disconnection Complete event and outputs it to the communication management unit 51 (S22). The communication management unit 51 outputs the LE_Disconnection Complete event to the request output unit 52 as a notification that the disconnection has been completed (S23).

  The process shown in FIG. 9 is a process when the writing time is short, but when the writing time is long, the process is as shown in FIG. The writing time is, for example, 10 seconds. The basic processing flow is the same as the processing shown in FIG. 9, but another read / write processing is inserted because there is time until a disconnection request is issued. Another read / write process is performed after receiving the write result in S14.

  Specifically, the request output unit 52 outputs another read / write request (S15). The communication management unit 51 outputs the read / write request to the communication unit 50 as a GATT Characteristic Read / Write Request command (S16). The communication unit 50 converts it into an Attribute Read / Write Request packet and transmits it to the image forming apparatus 11 (S17).

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Read / Write Request packet, converts it into an abstracted GATT Characteristic Read / Write Request command, and outputs it to the communication management unit 61 (S18). The communication management unit 61 outputs the command as a read / write request to the read / write processing unit 62 (S19). The read / write processing unit 62 performs the processing requested by the read / write request on the storage unit 63 (S20). Then, the read / write processing unit 62 notifies the communication management unit 61 that the read / write has been completed (S21). The communication management unit 61 returns a GATT Characteristic Read / Write Response event to the communication unit 60 indicating that reading and writing has been completed (S22). The communication unit 60 converts the GATT Characteristic Read / Write Response event into an Attribute Read / Write Response packet and responds to the smart device 10 (S23).

  The communication unit 50 receives the Attribute Read / Write Response packet from the image forming apparatus 11, converts it into a GATT Characteristic Read / Write Response event, and returns it to the communication management unit 51 (S24). The communication management unit 51 returns a GATT Characteristic Read / Write Response event to the request output unit 52 as a read / write result (S25). The request output unit 52 can notify the user of the result by, for example, displaying the writing result on the display device 25.

  In the embodiment shown in FIG. 10, after reaching the time when the measurement of time by the measuring unit 64 is written, the same processing as the processing after S15 shown in FIG. 9 is performed. As described above, when the writing time is variable and the reading / writing processing of the information of the image forming apparatus 11 can be performed from the smart device 10 while the time is measured, the time corresponding to the number of times of communication from the smart device 10 is set. can do. In addition, it is possible to control the time until disconnection processing when communication from the smart device 10 becomes impossible due to some trouble.

  With reference to FIG. 11, a process of writing time from the smart device 10, canceling once, and writing time again will be described. Cancellation can be realized by overwriting an invalid value in a predetermined location of the storage unit 63 in which the time is written before the time is reached. In this way, by referring to the GATT Characteristic value in the image forming apparatus 11 and adopting a configuration in which the cutting process is not executed unless the value is a predetermined value, the cutting process can be canceled and the predetermined value is written again. Thus, the cutting process can be executed. For example, after requesting that the disconnection process be executed after 10 seconds, if an error occurs on the smart device 10 side and it is desired to immediately execute the disconnection process, cancel the request once and then request again. Can be cut without waiting.

  Only portions different from the processing shown in FIG. 9 will be described. The process until the write result of S14 is received is the same as the process shown in FIG. In FIG. 11, some error occurs in the smart device 10 (S15). The request output unit 52 generates a request for writing an invalid value as cancellation information in order to cancel the request for executing the disconnection process after the writing time, and outputs the request to the communication management unit 51 (S16). The communication management unit 51 outputs the write request as a GATT Characteristic Write Request command to the communication unit 50 (S17). The communication unit 50 converts it into an Attribute Write Request packet and transmits it to the image forming apparatus 11 (S18).

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Write Request packet, converts it into an abstracted GATT Characteristic Write Request command, and outputs it to the communication management unit 61 (S19). The communication management unit 51 outputs the command as a write request to the read / write processing unit 62 (S20). The read / write processing unit 62 overwrites the specific location in the storage unit 63 with the time required for the write request (S21). Then, the read / write processing unit 62 notifies the instruction unit 65 that the writing has been completed (S22).

  The measuring unit 64 notifies the instructing unit 65 that the written time has been reached (S23). The instruction unit 65 receives the notification, but does not generate a disconnection request and does not instruct transmission of the disconnection request because the time value stored in the storage unit 63 is an invalid value. That is, the instruction unit 65 does not instruct cutting.

  The request output unit 52 generates a time write request to request disconnection again, and outputs the request to the communication management unit 51 (S24). The communication management unit 51 outputs the write request as a GATT Characteristic Write Request command to the communication unit 50 (S25). The communication unit 50 converts it into an Attribute Write Request packet and transmits it to the image forming apparatus 11 (S26).

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Write Request packet, converts it into an abstracted GATT Characteristic Write Request command, and outputs it to the communication management unit 61 (S27). The communication management unit 51 outputs the command as a write request to the read / write processing unit 62 (S28). The read / write processing unit 62 overwrites the specific location in the storage unit 63 with the time required for the write request (S29). Then, the read / write processing unit 62 notifies the instruction unit 65 that the writing has been completed (S30).

  The instruction unit 65 instructs the measurement unit 64 to start measuring time (S31). In response to the notification, the measurement unit 64 starts measuring time (S32).

  When the written time has been reached, the measuring unit 64 notifies the instruction unit 65 that the time has been reached (S33). The instructing unit 65 confirms the value stored in the storage unit 63, generates a request for disconnecting the connection with the smart device 10, and outputs the disconnection request to the communication management unit 61 to instruct disconnection (S34). . The communication management unit 61 outputs the disconnection request as the LE_Disconnect command to the communication unit 60 (S35). The communication unit 60 converts the LE_Disconnect command into an LL_TERMINATE_IND packet and transmits it to the smart device 10 (S36).

  When receiving the LL_TERMINATE_IND packet, the communication unit 50 of the smart device 10 returns an LL ack packet as a response (S37). Upon receiving the LLack packet, the communication unit 60 of the image forming apparatus 11 converts it into an LE_Disconnection Complete event and outputs it to the communication management unit 61 (S38). The communication management unit 61 responds to the instruction unit 65 as a notification that the disconnection is completed for the LE_Disconnection Complete event (S39).

  Further, the communication unit 50 of the smart device 10 converts the received LL_TERMINATE_IND packet into an LE_Disconnection Complete event and outputs it to the communication management unit 51 (S40). The communication management unit 51 outputs the LE_Disconnection Complete event to the request output unit 52 as a notification that the disconnection is completed (S41).

  The process of disconnecting the connection between the smart device 10 and the image forming apparatus 11 can be performed by sending a write request from the smart device 10 according to an instruction from the user. However, the process is automatically performed without an instruction. Is also possible. Specifically, by setting the connection to be disconnected after a predetermined time from the completion of the connection, the measurement unit 64 measures the time and automatically executes the disconnection process when the time is reached. be able to. Accordingly, it is possible to automatically disconnect the wireless connection with the image forming apparatus 11 when the wireless connection is accidentally performed for a long time without knowing the user and the wireless connection with the image forming apparatus 11 is occupied. In addition, the time during which other smart devices cannot connect to the image forming apparatus 11 can be shortened.

  With reference to FIG. 12, a case where the cutting process is automatically performed will be described. The request output unit 52 receives a connection instruction from the user, for example, generates a connection request for the image forming apparatus 11 and outputs the connection request to the communication management unit 51 (S1). The communication management unit 51 outputs the connection request to the communication unit 50 as an LE Create Connection command (S2). The communication unit 50 converts it into a CONNECT_REQ packet and transmits it to the image forming apparatus 11 (S3).

  In the image forming apparatus 11, the communication unit 60 receives the CONNECT_REQ packet, exchanges connection parameters with the communication unit 50 of the smart device 10, and establishes a connection. The communication unit 60 outputs the fact that communication has been established to the communication management unit 61 as an LE Connection Complete command (S4). The communication management unit 51 notifies the instruction unit 65 of the command as a connection completion notification (S5). The instruction unit 65 instructs the measurement unit 64 to start measuring time (S6). In response to the instruction, the measurement unit 64 starts measuring the time written in advance in a predetermined location of the storage unit 63 (S7).

  After the connection is established, the communication unit 50 of the smart device 10 outputs to the communication management unit 51 that the connection has been established to the communication management unit 51 as an LE Connection Complete command (S8). The communication management unit 51 notifies the request output unit 52 of the command as a connection completion notification (S9). The request output unit 52 can notify the user of the result by displaying on the display device 25 that the connection has been completed.

  When the pre-written time is reached, the measuring unit 64 notifies the instruction unit 65 that the time has been reached (S10). In this example, since the written value has not been changed, the instruction unit 65 generates a request to disconnect from the smart device 10 and outputs the disconnect request to the communication management unit 61 to instruct disconnection. (S11). The communication management unit 61 outputs the disconnection request as the LE_Disconnect command to the communication unit 60 (S12). The communication unit 60 converts the LE_Disconnect command into an LL_TERMINATE_IND packet and transmits it to the smart device 10 (S13).

  When receiving the LL_TERMINATE_IND packet, the communication unit 50 of the smart device 10 returns an LL ack packet as a response (S14). Upon receiving the LLack packet, the communication unit 60 of the image forming apparatus 11 converts it into an LE_Disconnection Complete event and outputs it to the communication management unit 61 (S15). The communication management unit 61 responds to the instruction unit 65 as a notification that the disconnection is completed for the LE_Disconnection Complete event (S16).

  Further, the communication unit 50 of the smart device 10 converts the received LL_TERMINATE_IND packet into an LE_Disconnection Complete event and outputs it to the communication management unit 51 (S17). The communication management unit 51 outputs the LE_Disconnection Complete event to the request output unit 52 as a notification that the disconnection is completed (S18).

  The processing performed by the communication system, communication terminal, and information processing apparatus based on the BLE specifications has been described in detail so far, but is not limited to wireless communication based on BLE. Therefore, the present invention can be applied to other wireless communications. In the above example, it is described that the value is overwritten in a specific location in the storage unit 63, but it may be stored in another location, in which case the latest written value is adopted. Can do.

  The present application will be described more specifically in light of specific use cases. FIG. 13 is a diagram showing a flow of acquiring print settings for printing from the smart device 10 to the image forming apparatus 11 and information for wireless connection by wireless communication prior to printing. When the request processing unit 52 of the smart device 10 makes a connection request using the API provided by the platform (S1), an LE Create Connection command is sent from the communication management unit 51 of the smart device 10 to the communication unit 50 ( S2).

  In response to this, a CONNECT_REQ command that is a connection request is sent from the communication unit 50 of the smart device 10 to the communication unit 60 of the image forming apparatus 11 (S3). When the connection is completed after exchanging parameters related to the connection between the smart device 10 and the image forming apparatus 11, the communication unit 50 of the smart device 10 and the communication unit 60 of the image forming apparatus 11 transfer to the respective hosts. In response, an LE Connection Complete command is sent (S4). Further, the communication management unit 51 of the smart device 10 receives LE Connection Complete () via the API (S4), and the connection is completed (S5).

  On the other hand, when the communication unit 60 of the image forming apparatus 11 receives the connection request, it issues a connection start request LE Create Connection () to the communication management unit 61 (S 6), and the communication management unit 61 notifies the read / write processing unit 62. Notify completion of connection (S7). Through the series of processes, the connection from the smart device 10 to the image forming apparatus 11 is completed. Thereafter, the parameters necessary for printing and other wireless connections on the wireless communication in which the connection from the smart device 10 to the image forming apparatus 11 is completed. The process of exchanging necessary information is executed.

  Specifically, the IP address is notified as communication information from the smart device to the image forming apparatus 11. Conversely, the IP address may be notified from the image forming apparatus 11 to the smart device. The notification of the IP address does not need to be performed in both directions, and may be performed only in one direction from the image forming apparatus 11 to the smart device and from the smart device to the image forming apparatus 11.

  Note that the communication information to be notified is not limited to the IP address. For example, the communication information is not particularly limited as long as it is communication information for wireless connection between the MAC address, the SSID, and the smart device and the image forming apparatus. Absent. In this embodiment, wireless connection means wireless communication using a communication infrastructure different from BLE, and uses any communication protocol, ieee.802.x standard wireless communication, LTE, Wi-fi, 3G. It doesn't matter.

  Thereafter, the request output unit 52 of the smart device 10 issues a time write request for a set time to the communication management unit 51 in order to immediately connect a connection that is no longer needed (S8). When the IP address is notified, the time writing is performed in the present embodiment in order to immediately disconnect from the request processing unit 52 of the smart device 10. In this figure, we want to cut immediately, so we can set 1 second. This is expected that a timer of the image system apparatus fires after 1 second from completion of writing and a disconnection request is sent from the image forming apparatus side.

  When the disconnection is completed, in order to print between the smart device and the image forming apparatus, a wireless connection using the communication information described above is performed, and print settings and print data are communicated to perform printing from the smart device. Upon receiving the time write request, the communication management unit 51 sets the time to the GATT Characteristic value, issues GATT Characteristic Write () to the communication unit 50 (S9), and the communication unit 50 sends the image forming apparatus 11 with it. Attribute Write Request () is issued to the communication unit 60 of the image forming apparatus 11 (S10).

  The communication unit 60 of the image forming apparatus 11 passes the Attribute Write Request () received to the communication management unit 61 to the communication management unit 61 (S 11), and instructs the read / write processing unit 62 to write the GATT Characteristic value. (S12). The read / write processing unit 62 instructs the timer 62a to start timer timing using the received GATT Characteristic value (S13), and the timer 62a immediately starts timer timing (S14).

  On the other hand, when issuing the start of timer timing, the read / write processing unit 62 issues LE_GATT Characteristic Response () for notifying the communication management unit 61 that the writing of the GATT Characteristic value has been completed (S15), and the communication management unit 61 issues Attribute Write Response () to the communication unit 60 (S16). The communication unit 60 of the image forming apparatus 11 notifies Attribute Write Response to the communication unit 50 of the smart device 10 (S17).

  The communication unit 50 that has received the notification notifies the communication management unit 51 of the GATT Characteristic Response (S18), and the communication management unit 51 notifies the request output unit 52 that the writing has been completed ( S19).

  When the timer 62a expires, the timer is activated (S20), the read / write processing unit 62 issues a processing request to disconnect the connection to the communication management unit 61 (S21), and the communication management unit 61 sends the request to the communication unit 60. In order to end the communication state of the smart device 10, LE Disconnect () is issued (S22), and the communication unit 60 sends LL_terminate_IND to the communication unit 50 of the smart device 10 (S23). Upon receiving the notification, the communication unit 50 of the smart device 10 issues LL_ack to the communication unit 60 of the image forming apparatus 11 (S24). The communication unit 60 of the image forming apparatus 11 receives the notification and notifies the communication management unit 61 of LE Disconnection Complete for notifying that the disconnection has been completed (S25).

  The communication management unit 61 issues a disconnection completion notification to the read / write processing unit 62 (S26), and ends the disconnection process on the image forming apparatus 11 side.

  When LL_ack is issued, the communication unit 50 of the smart device 10 issues LE Disconnection Complete notifying the communication management unit 51 of completion of disconnection (S27). Receiving the notification, the communication management unit 51 of the smart device 10 notifies the request type correction unit 52 of the disconnection completion, and ends the processing on the smart device 10 side (S28). After that, the smart device 10 and the image forming apparatus 11 can start printing by performing wireless connection using a wireless LAN or the like.

  Although the present invention has been described with the above-described embodiments as a communication system, an information processing apparatus, a communication terminal, a communication disconnection method, and a program, the present invention is not limited to the above-described embodiments. The present invention can be modified within a range that can be conceived by those skilled in the art, such as other embodiments, additions, modifications, and deletions, and the present invention is not limited as long as the operations and effects of the present invention are exhibited in any aspect. It is included in the scope of the invention. Therefore, the present invention can also provide a recording medium on which the above program is recorded, an external device that provides the program via a network, and the like.

DESCRIPTION OF SYMBOLS 10 ... Smart device, 11 ... Image forming apparatus, 12 ... Network, 20 ... CPU, 21 ... RAM, 22 ... ROM, 23 ... HDD, 24 ... I / F, 25 ... Display device, 26 ... Input device, 27, 28 ... wireless communication media, 29 ... bus, 30 ... controller, 31 ... CPU, 32 ... NB, 33 ... MEM-P, 33a ... ROM, 33b ... RAM, 34 ... SB, 35 ... MEM-C, 36 ... ASIC, 37 ... HDD, 38 ... AGP bus, 40 ... engine part, 41 ... PCI bus, 42 ... operation part, 43 ... FCU, 44 ... USB, 45 ... IEEE1394 interface, 46, 47 ... wireless communication media, 50 ... communication part, 51 ... Communication management section 52 ... Request output section 53 ... Time determination section 54 ... Encoding section 55 ... Decoding section 60 ... Communication section 61 ... Communication management section 62 ... Read / write processing section 63 ... Storage section 64: Measuring unit, 65: Instruction unit, 66: Encoding unit, 67: Decoding

JP 2003-61159 A

Claims (16)

A communication system for performing communication between a communication terminal and an information processing device,
The information processing apparatus is
A request receiving unit that receives from the communication terminal a transmission request for requesting the information processing apparatus to transmit a disconnection request for requesting disconnection of the communication;
An instruction unit that receives the transmission request and instructs the communication terminal to transmit the disconnection request;
A communication unit that receives an instruction from the instruction unit and transmits the disconnection request to the communication terminal;
The communication unit receives a response to the disconnection request from the communication terminal, and disconnects communication with the communication terminal. The transmission request is a write request for causing the information processing apparatus to execute processing for writing information related to transmission of the disconnection request in the storage unit of the information processing apparatus,
The communication system according to claim 1, wherein the information processing apparatus further includes a read / write processing unit that performs a process of writing information related to transmission of the disconnection request. Including a measuring unit that measures time,
The information related to the transmission of the disconnection request is a time measured until the disconnection request is transmitted,
In response to the end of the process of writing the time to be measured until the read / write processing unit transmits the disconnection request to the storage unit, the instruction unit starts measuring the time to the measurement unit. The communication system according to claim 2, wherein when the time measured by the measurement unit reaches the time written in the storage unit, the disconnection request is transmitted.   The read / write processing unit receives an execution request for reading, writing, or both of the information from the communication terminal to the storage unit while measuring the time by the measuring unit. The communication system according to claim 3, wherein a write process or both processes are executed. The read / write processing unit writes information indicating that the disconnection processing is canceled from the communication terminal to the storage unit,
The said instruction | indication part does not instruct | indicate the transmission of the said cutting | disconnection request | requirement with respect to the said communication part in response to the information which shows canceling | releasing the said cutting process being written in the said memory | storage part. The communication system according to claim 1.   The communication system according to claim 4, further comprising: an encoding unit that encodes information to be transmitted to the communication terminal; and a decoding unit that decodes encoded information received from the communication terminal.   The communication according to any one of claims 1 to 6, wherein communication between the communication terminal and the information processing apparatus is wireless communication using Bluetooth (registered trademark), and the disconnection request is an LL_TERMINATE_IND packet. system.   The communication system according to claim 7, wherein the transmission request is a packet of a different type from the LL_TERMINATE_IND packet.   The communication system according to claim 7 or 8, wherein the different types of packets are Attribute Write Request packets. The information processing apparatus is an image forming apparatus,
The request receiver is
The transmission request is received from the communication terminal after the image processing apparatus receives communication information for performing communication different from the communication with the communication terminal from the communication terminal. The communication system according to item. The information processing apparatus used in a communication system that performs communication between a communication terminal and an information processing apparatus,
A request receiving unit that receives from the communication terminal a transmission request for requesting the information processing apparatus to transmit a disconnection request for requesting disconnection of the communication;
An instruction unit that receives the transmission request and instructs the communication terminal to transmit a disconnection request for disconnecting the communication;
A communication unit that receives an instruction from the instruction unit and transmits the disconnection request to the communication terminal;
The information processing apparatus, wherein the communication unit receives a response to the disconnection request from the communication terminal and disconnects communication with the communication terminal. A communication system for performing communication between a communication terminal and an information processing device,
The communication terminal is
A request output unit for outputting a write request for causing the information processing device to execute processing for writing information on transmission of a disconnection request for disconnecting the communication to a storage unit included in the information processing device;
A communication unit that transmits the write request output by the request output unit to the information processing apparatus,
The information processing apparatus is
A request receiving unit for receiving the write request;
A read / write processing unit that performs processing of writing information related to transmission of the disconnection request in the storage unit;
A measurement unit that starts measuring time in response to completion of the process of writing the time to be measured until the read / write processing unit transmits the disconnection request to the storage unit as information related to transmission of the disconnection request;
An instruction unit that instructs the communication terminal to transmit a disconnection request to disconnect the communication when the time measured by the measurement unit reaches the time written in the storage unit;
A communication unit that receives an instruction from the instruction unit and transmits the disconnection request to the communication terminal;
The communication unit of the communication terminal receives the disconnection request from the information processing apparatus, transmits a response to the disconnection request,
The communication unit of the information processing apparatus receives the response from the communication terminal and disconnects communication with the communication terminal. The communication terminal used in a communication system that performs communication between a communication terminal and an information processing apparatus,
A request receiving unit that receives from the communication terminal a transmission request for requesting the information processing apparatus to transmit a disconnection request for requesting disconnection of the communication;
A communication unit that transmits the transmission request to be written output by the request output unit to the information processing apparatus,
The communication unit receives a disconnection request for disconnecting the communication from the information processing apparatus, transmits a response to the disconnection request, and disconnects the communication. In a communication system that performs communication between a communication terminal and an information processing apparatus, a communication method executed by the information processing apparatus,
Receiving a request for transmitting a disconnection request for disconnecting the communication from the communication terminal;
Receiving the request and instructing the communication terminal to transmit a disconnection request for disconnecting the communication;
Receiving the disconnection request transmission instruction, and transmitting the disconnection request to the communication terminal;
Receiving a response to the disconnection request from the communication terminal, and disconnecting the communication with the communication terminal. A communication method for disconnecting communication performed between a communication terminal and an information processing device,
The communication terminal is
Outputting a write request for causing the information processing apparatus to execute a process of writing information relating to transmission of a disconnection request for disconnecting the communication to a storage unit included in the information processing apparatus;
Executing the step of transmitting the output write request to the information processing device;
The information processing apparatus is
Receiving the write request;
Performing a process of writing information related to transmission of the disconnection request in the storage unit;
In response to the completion of the process of writing the time to be measured until the disconnection request is transmitted as information related to the transmission of the disconnection request in the storage unit,
Instructing the communication terminal to transmit a disconnection request for disconnecting the communication when the measured time reaches the time written in the storage unit;
Receiving the disconnection request transmission instruction, and transmitting the disconnection request to the communication terminal,
The communication terminal receives the disconnection request from the information processing apparatus, and executes a step of transmitting a response to the disconnection request,
A communication method in which the information processing apparatus receives the response from the communication terminal and executes a step of disconnecting communication with the communication terminal.   A program for causing a computer to execute each step included in the communication method according to claim 14 or 15.