WO2001091504A1 - Procede, systeme et dispositif de transmission de donnees - Google Patents

Procede, systeme et dispositif de transmission de donnees Download PDF

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Publication number
WO2001091504A1
WO2001091504A1 PCT/JP2001/004284 JP0104284W WO0191504A1 WO 2001091504 A1 WO2001091504 A1 WO 2001091504A1 JP 0104284 W JP0104284 W JP 0104284W WO 0191504 A1 WO0191504 A1 WO 0191504A1
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WO
WIPO (PCT)
Prior art keywords
data transmission
response
command
data
communication
Prior art date
Application number
PCT/JP2001/004284
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English (en)
Japanese (ja)
Inventor
Harumi Kawamura
Original Assignee
Sony Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2001091504A1 publication Critical patent/WO2001091504A1/fr

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G06F13/387—Information transfer, e.g. on bus using universal interface adapter for adaptation of different data processing systems to different peripheral devices, e.g. protocol converters for incompatible systems, open system

Definitions

  • the present invention relates to a data transmission method suitable for, for example, a short-distance wireless transmission system, a data transmission system to which the data transmission method is applied, and a data transmission device used in the system.
  • the present invention relates to a technique suitable for processing when wireless transmission is performed between devices, video devices, and devices that control these devices.
  • Bluetooth a wireless transmission system of a standard called Bluetooth (trademark) has been proposed and is being put to practical use.
  • This wireless transmission system wirelessly transmits audio data for telephone communication, image data for facsimile, computer data, etc., using a 2.4 GHz frequency band between multiple devices. Is
  • the wireless transmission distance between devices is a short-distance wireless transmission method that assumes a relatively short-distance network from several meters to a maximum of about 100 m.
  • a profile is defined for each type of data to be transmitted, which defines how the data is transmitted. The details of the communication method will be described in the section of the best mode for carrying out the invention described later, but the standardization body that defines the standards, the Bluetooth SIG, has released it.
  • the device that sends control commands to this video device determines which function block should send the command. There is no problem. Note that, here, the description has been made by taking a bluetooth as an example. However, the same problem occurs when another similar wireless transmission network is configured.
  • a first invention relates to a data transmission method for transmitting a command of a predetermined format and a response thereof between one device and another device capable of bidirectional data transmission over a predetermined wireless transmission network.
  • the one device On the first channel in the network, the one device transmits an inquiry command to the other device to check whether control by the predetermined command is possible, and transmits the inquiry command to the other device.
  • the device is a data transmission method that responds to the above inquiry command as the above response. By doing so, it becomes easy to determine whether the other device can be controlled by a predetermined command. Therefore, when controlling the other party's equipment, it becomes easy and reliable to determine which command to use, and Good control of equipment using the wire transmission network.
  • the second invention is the data transmission method according to the first invention, wherein the response as a response to the inquiry command includes the name or identification code of a corresponding subnet in the other device. Is returned. By doing so, the name of the subject corresponding to the predetermined command can be known.
  • the third invention is the data transmission method of the first invention, wherein In the response, the number of corresponding subnets in the other device is returned. This makes it possible to determine the number of sub-units corresponding to a given command.
  • a fourth invention relates to the data transmission method according to the first invention, wherein one of the devices that has received the response is capable of controlling the other device based on the data obtained in the response.
  • the display is made.
  • a fifth invention is a data transmission method for transmitting a command of a predetermined format and a response thereof between one device and another device capable of transmitting and receiving data in both directions over a predetermined wireless transmission network.
  • the one device transmits an inquiry command to the other device to check which application can be controlled.
  • the other device is a data transmission method in which a response to the inquiry command is sent as the response.
  • the response as the response to the inquiry command is performed by the other device as described above. Is returned. By doing so, the name of the corresponding application can be understood.
  • the number of corresponding associations is returned by the other device. It was done. By doing so, the number of compatible applications can be determined.
  • An eighth invention is the data transmission method according to the fifth invention, wherein one of the devices receiving the response responds to the application corresponding to the other device based on the data obtained in the response. Is displayed. By doing so, the user can easily know the mode in which the other device can be controlled based on the display, and the operation for remote control of the other device can be performed well.
  • a ninth invention is a data transmission system for transmitting a command of a predetermined format and its response between a first device and a second device capable of bidirectional data transmission over a predetermined wireless transmission network.
  • a first communication unit that performs bidirectional communication with the second device via the network as the first device, and a second device configured to execute a predetermined command.
  • First control that generates an inquiry command to check whether control is possible and sends it out from the first communication means Means, the second communication means performing bidirectional communication with the first equipment via the network as the second equipment, and the second communication means inquiring as to the second equipment.
  • the data transmission system is provided with second control means for generating a response to the inquiry and transmitting the response from the second communication means.
  • the first device can easily determine whether the second device can be controlled by a predetermined command. Therefore, when the first device controls the second device, it is possible to easily and reliably determine which command should be used, and the control of the device using the wireless transmission network is improved. Can be done.
  • a name or an identification code of a corresponding subnet in the second device is provided as a response generated by the second control means. It is intended to be added. By doing so, the name of the subject corresponding to the predetermined command can be understood.
  • a code corresponding to the number of corresponding subnets in the second device is added as a response generated by the second control means. It was made. By doing so, the number of sub-units corresponding to a given command can be determined.
  • the first control means determines a function capable of controlling the second device, and includes a display means for performing a display based on the determination. By doing so, the user can easily know the mode in which the second device can be controlled based on the display. Operation for remote control of the second device can be performed well with the device.
  • a thirteenth invention is directed to a method for transmitting a command of a predetermined format and a response thereof between a first device and a second device capable of bidirectional data transmission over a predetermined wireless transmission network.
  • a first device a first communication means for performing bidirectional communication with the second device via the network, and a second device, each of which is composed of: A first control means for generating an inquiry command for checking whether control corresponding to the case is possible and transmitting the generated command from the first communication means, and as the second device, A second communication means for performing bidirectional communication with the first device via a network, and when the second communication means receives an inquiry command, generates a response to the inquiry in response to the inquiry command.
  • the second communicator Those having a second control means for sending from.
  • the first device can easily determine which application can be controlled by the second device. Therefore, when the first device controls the second device, it is possible to easily and reliably determine which application can control the device, and the device using the wireless transmission network can be determined. Can be controlled well.
  • the fourteenth invention is a data transmission system according to the thirteenth invention.
  • a name or identification code of a corresponding application in the second device is added. By doing so, the first device can know the name of the application corresponding to the second device.
  • the response generated by the second control means is a code of the number of corresponding applications in the second device. Add That's what I did. By doing so, the first device can determine the number of applications corresponding to the second device.
  • the first device when the first device receives the response, the first device performs a process based on data obtained by the response.
  • the first control means determines an application supported by the second device, and includes a display means for performing a display based on the determination. By doing so, the user can easily know the manner in which the first device can control the second device based on the display, and the operation for remotely controlling the second device can be performed. Good ⁇ can do it.
  • a seventeenth invention is a data transmission device connected to a predetermined wireless transmission network, wherein the communication means performs bidirectional communication with another device connected via the network, and A data transmission device comprising a control means for generating an inquiry command for checking whether a predetermined device connected via a network can be controlled by a predetermined command and transmitting the inquiry command from the communication means. It is. By doing so, it becomes easy to determine whether the other device can be controlled by a predetermined command. Therefore, when controlling the other party's equipment, it is easy and reliable to determine which command should be used, and the equipment using the wireless transmission network can be controlled well.
  • An eighteenth aspect of the present invention is the data transmission device according to the seventeenth aspect, wherein the control means determines a name of a corresponding subunit in the predetermined device from a response to the command received by the communication means. Alternatively, the identification code is determined. By doing so, the name of the subnet corresponding to the given command Will be able to understand.
  • a nineteenth aspect of the present invention is the data transmission apparatus according to the seventeenth aspect, wherein the control means determines the number of corresponding subnets in the predetermined device from a response to the command received by the communication means. Is determined. By doing so, the number of subjects corresponding to a given command can be determined.
  • a twenty-first invention is a data transmission device according to the seventeenth invention, wherein, when the communication means receives the response, the predetermined device can be controlled based on data obtained by the response. Is provided by the control means, and display means is provided for performing display based on the determination. By doing so, the user can easily know the manner in which the other party's device can be controlled based on the display on the display means, and the operation for remote control of the other party's device can be performed well. .
  • the twenty-first invention is a device connected to a predetermined wireless transmission network.
  • a communication means for performing bidirectional communication with another device connected via the network and an inquiry command for checking whether the communication means can be controlled by a predetermined command are received. Then, the data transmission device is provided with control means for generating a response to the inquiry and transmitting the response from the communication means. By doing so, it becomes easy for other devices to determine whether this device can be controlled with a predetermined command.
  • a name or an identification code of a corresponding subunit in the device is added as a response generated by the control means. It is. By doing so, the name of the subnet corresponding to the predetermined command can be understood on the other device.
  • a code for the number of corresponding subnets in the device is added as a response generated by the control means. It was done. By doing so, the number of subnets corresponding to a given command can be determined on the other device.
  • a communication means for performing bidirectional communication with another device connected via the network Control means for generating an inquiry command for checking which application can be controlled by a predetermined device connected via a network and transmitting the inquiry command from the communication means. It is a device. By doing so, it becomes easy to determine which application can be controlled by the other device. Therefore, when controlling a partner device, it is possible to easily and reliably determine which application can be controlled, and control of a device using a wireless transmission network is favorable. Can be done.
  • a twenty-fifth aspect of the present invention is the data transmission apparatus according to the twenty-fourth aspect, wherein the control means determines a response to the command received by the communication means from a response to the command in the predetermined device.
  • the name or the identification code is determined. By doing so, the name of the subject corresponding to the predetermined command can be understood.
  • a twenty-sixth invention is the data transmission device according to the twenty-fourth invention, wherein the control means uses a response to the command received by the communication means to a corresponding application in the predetermined device. The number of components is determined. By doing so, it becomes possible to determine the number of sub-units corresponding to a given command.
  • the predetermined device when the communication unit receives the response, the predetermined device responds based on data obtained by the response.
  • a display means is provided for judging the abortion by the control means and performing a display based on the judgment. By doing so, the user can easily know the mode in which the other device can be controlled based on the display, and the operation for remote control of the other device can be favorably performed. .
  • a twenty-eighth invention is a device connected to a predetermined wireless transmission network.
  • the evening transmission device receive a communication means for performing bidirectional communication with other devices connected via the network, and an inquiry command for checking which application the communication means supports. Then, the data transmission apparatus is provided with control means for generating a response to the inquiry and transmitting the response from the communication means. By doing so, it becomes easy to determine which application can be controlled by the other device.
  • a twentieth aspect of the present invention is the data transmission apparatus according to the twenty-eighth aspect of the present invention, wherein the data transmission apparatus adds the name or identification code of an application corresponding to the apparatus as a response generated by the control means. That is what we did. By doing so, the name of the corresponding application can be understood on the partner device.
  • a 30th invention is the data transmission apparatus according to the 28th invention, wherein a code of the number of applications corresponding to the apparatus is added as a response generated by the control means. It is. By doing so, the number of compatible applications on the partner device can be determined.
  • FIG. 1 is a block diagram illustrating a configuration example of a wireless transmission unit according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing an example of an audio recording / reproducing apparatus according to an embodiment of the present invention.
  • FIG. 3 is a block diagram showing an example of a remote control device according to an embodiment of the present invention.
  • FIG. 4 is an explanatory diagram showing an example of a protocol stack.
  • FIG. 5 is an explanatory diagram illustrating an example of a hierarchical structure of wireless transmission.
  • FIG. 6 is an explanatory diagram showing an example of setting a transmission frequency.
  • FIG. 7 is an explanatory diagram showing a state of frequency hopping.
  • FIG. 8 is an explanatory diagram showing an example of the arrangement of a single-slot bucket on a time axis.
  • FIG. 4 is an explanatory diagram showing an example in which a plurality of packets coexist on a time axis.
  • FIG. 10 is an explanatory diagram showing an example of a transmission state between the master and slave.
  • FIG. 11 is an explanatory diagram illustrating an example of a network configuration.
  • FIG. 12 is a timing diagram showing a communication example of the SC0 link.
  • Figure 13 is a timing diagram showing an example of communication in the asynchronous communication system.o
  • FIG. 14 is a timing diagram showing a communication example of the isochronous communication method.
  • FIG. 15 is a timing diagram showing a communication example of the broadcast communication method.
  • FIG. 16 is a timing diagram showing a communication example when the SCO link and the ALC link are used together.
  • FIG. 17 is an explanatory diagram showing a configuration example of clock data.
  • FIG. 18 is an explanatory diagram showing a configuration example of an address.
  • FIG. 19 is a configuration diagram illustrating an example of a process of generating a frequency hopping pattern.
  • FIG. 20 is an explanatory diagram showing an example of a bucket format.
  • FIG. 21 is an explanatory diagram showing a configuration example of the access code.
  • FIG. 22 is an explanatory diagram showing a configuration example of the bucket header.
  • FIG. 23 is an explanatory diagram showing a configuration example of the payload.
  • FIG. 4 is an explanatory diagram showing a configuration example of a payload header of a packet.
  • FIG. 25 is an explanatory diagram showing a configuration example of the payload header of the multi-slot 0 packet.
  • FIG. 26 is an explanatory diagram showing a configuration example of the payload of the FHS bucket.
  • FIG. 27 is an explanatory diagram illustrating an example of a state transition of a device.
  • FIG. 28 is an explanatory diagram illustrating an example of communication of an inquiry.
  • FIG. 29 is a timing diagram illustrating an example of processing of an inquiry.
  • FIG. 30 is an explanatory diagram of a communication example of a call.
  • FIG. 31 is a timing diagram showing an example of a call process.
  • FIG. 32 is an explanatory diagram showing an example of a hierarchical structure in the AVZC protocol.
  • FIG. 33 is an explanatory diagram showing an example of a bucket configuration in the AVZC protocol.
  • Figure 34 is an explanatory diagram showing an example of establishing a connection and transmitting commands and responses under the AV / C protocol.
  • FIG. 35 is an explanatory diagram showing an example of a release connection using the AVZC protocol.
  • FIG. 36 is an explanatory diagram showing an example of a data structure in the AVZC protocol.
  • FIG. 37 is an explanatory diagram showing a specific example of the command.
  • FIG. 38 is an explanatory diagram showing a specific example of the command and the response.
  • FIG. 39 is an explanatory diagram illustrating an example of transmission between devices according to an embodiment of the present invention.
  • FIG. 40 is an explanatory diagram showing another example of transmission between devices according to an embodiment of the present invention.
  • FIG. 41 is an explanatory diagram showing a configuration example of the pass-through command.
  • FIG. 42 is an explanatory diagram illustrating an example of an operation id list.
  • FIG. 43 is an explanatory diagram illustrating an example of a response command and a response corresponding to a subunit command.
  • FIG. 44 is an explanatory diagram showing an example of an application correspondence inquiry command and a response.
  • FIG. 45 is an explanatory diagram showing an example of a status command and a response. .
  • Figure 46 is an explanatory diagram showing an example of a status command and response.
  • a short-distance wireless transmission system standardized as the Bluetooth standard is applied to a system in which a wireless network is established between a plurality of devices.
  • the system is mainly composed of electronic equipment such as video equipment and audio equipment.
  • FIG. 1 shows an example of the configuration of the short-range wireless communication unit included in the electronic device of this example.
  • the transmission / reception processing unit 2 to which the antenna 1 is connected performs high-frequency signal processing to execute wireless transmission processing and wireless reception processing.
  • the signal transmitted and received by the transmission / reception processing unit 2 is transmitted on channels set at 1 MHz intervals in the 2.4 GHz band.
  • the signal of each channel is subjected to a process called frequency hobbing, which changes the transmission frequency at a slot interval, which will be described later.
  • frequency hobbing Assuming that frequency hobbing is performed for each slot, the frequency is switched 160 times per second since one slot is 625 ms, so that the frequency can be switched with other wireless communication. Interference is prevented.
  • As a modulation method for wireless transmission signals is a modulation method for wireless transmission signals.
  • GFSK Gausian filtered FSK
  • This modulation method is a frequency shift keying method in which the frequency transfer characteristic is band-limited at the low-pass filter having a Gaussian distribution.
  • the signal received by the transmission / reception processing unit 2 and the signal to be transmitted by the transmission / reception processing unit 2 are subjected to first-band processing by the data processing unit 3.
  • the bluetooth standard basically employs a TDD (Time Division Duplex) system in which transmission and reception are alternately performed, and the data processing unit 3 alternately performs transmission slot processing and reception slot processing.
  • a function processing block 10 is connected to the data processing section 3 via an interface section 4 so as to supply received data to a function processing block 20 or a function processing block 2.
  • the data sent from 0 is processed by the data processing unit 3 as a transmission slot.
  • Processing for transmission in the transmission / reception processing unit 2, the data processing unit 3, and the interface unit 4 is executed under the control of the controller 5.
  • the controller 5 for example, a central control unit built in each device can be used. Apart from the central control unit, a dedicated controller prepared for short-range wireless communication may be used.
  • the transmission / reception processing unit 2, the data processing unit 3, the interface unit 4, and the controller 5 are a short-range wireless communication unit 10 that communicates via Bluetooth.
  • the function processing block 20 connected to the short-range wireless communication unit 10 corresponds to a unit that actually executes a function as a device.
  • a video camera or a video recording / reproducing device it corresponds to a portion that processes recording and reproduction of video data and audio data.
  • an audio recording / reproducing device it corresponds to a portion for processing recording and reproduction of audio data.
  • a computer device it corresponds to a portion that executes data processing based on a prepared program.
  • the short-range wireless communication unit 10 may be configured as a device separate from the device main body and connected externally, instead of being built in the electronic device main body.
  • FIG. 2 is a diagram showing a configuration example in the case where the function processing block 20 is a block of the audio recording / reproducing apparatus 100.
  • the audio recording / reproducing apparatus 100 in this example uses a magneto-optical disc or optical disc, which is called a mini disc (MD), housed in a resin package as a recording medium to digitally convert audio signals and the like. This device records and reproduces data.
  • MD magneto-optical disc or optical disc
  • an analog two-channel audio signal input from the outside is converted into a digital audio signal by the analog-to-digital converter 101.
  • the converted digital audio data is supplied to an ATRAC encoder 102 and is encoded into an audio data compressed by an ATRAC (Adaptive Transform Acoustic Coding) method.
  • ATRAC Adaptive Transform Acoustic Coding
  • the data encoded by the encoder 102 is supplied to the recording / reproducing unit 1Q3 to perform a recording process, and the optical pickup 104 is driven based on the processed data, and The data is recorded on disk (magneto-optical disk) 105.
  • the magnetic field is modulated by a magnetic head (not shown).
  • the reproducing system As a configuration of the reproducing system, data recorded on a disc (a magneto-optical disc or an optical disc) 105 is read out by an optical pickup 104, and a reproducing process is performed by a recording / reproducing unit 103.
  • the reproduced audio data is supplied to an ATRAC decoder 106 to be decoded into digital audio data of a predetermined format, and the decoded audio data is converted to a digital Z analog converter 107 To convert it to a two-channel analog audio signal and output it.
  • the audio data decoded by the ATRAC decoder 106 is directly output without passing through the digital-to-analog converter 107.
  • the analog audio output signal is supplied to an amplifier device 51 to perform audio output processing such as amplification, and audio (audio) of two channels is output from the connected speakers 52 and 53. E) is output.
  • the audio recording / reproducing apparatus 100 of the present example is provided with a wireless processing block 10 for performing wireless communication by the above-mentioned Bluetooth method, and is connected to the other party via the antenna 1 connected thereto. Two-way wireless communication is performed with the wireless processing block.
  • the audio data received by the wireless processing block 10 is supplied to the recording / reproducing unit 102 via the ATRAC encoder 102 and the disk 105 Can be recorded.
  • the audio data reproduced from the disc 105 can be supplied from the recording / reproducing unit 102 to the wireless processing block 10 via the ATRAC decoder 106 to be wirelessly transmitted to the device on the other side. It is like that.
  • the recording and playback processing in the audio recording / reproducing apparatus 100, and the transmission and reception processing in the wireless processing block 10 are executed under the control of the central control unit (CPU) 110.
  • CPU central control unit
  • a memory 111 which is a work RAM, is connected to CPU 110.
  • operation information from the operation panel 112 is supplied to the CPU 110 to perform operation control corresponding to the operation information.
  • control data such as a control command and response described later is received by the wireless processing block 10
  • the data is supplied to the CPU 110, and operation control corresponding to the CPU 110 is performed. And processing.
  • the CPU 110 When transmitting control data such as control commands and responses wirelessly from the device 100, the CPU 110 generates the control data to be transmitted, and the wireless processing block 10 transmits the data wirelessly. It is made to let.
  • FIG. 3 is a diagram showing a configuration example of a remote control device 200 for remotely controlling the audio recording / reproducing device 100 and the like.
  • the remote control device 200 of this example transmits a wireless signal of the Bluetooth standard to the audio recording / reproducing device 100, and operates the audio recording / reproducing device 100. Is controlled.
  • the remote control device 200 is provided with an operation key 201 for instructing various operations, and controls that the operation key 201 is operated.
  • the central control unit (CPU) 202 as the means makes the judgment.
  • a display panel 203 that displays the operation status and the operation status of the controlled device is provided. The corresponding display is executed with a number or a figure.
  • a control code generator 204 is connected to the CPU 202. For example, when the operation key 201 is operated, a control code corresponding to the operated operation is controlled by the control code.
  • the generated control code is generated by the generation unit 204, and the generated control code is supplied to the wireless processing block 10 for wireless transmission. Further, the control code received by the wireless processing protocol 10 is supplied to the reception code discrimination section 205, and the reception code discriminated by the discrimination section 205 is sent to the CPU 202. To supply.
  • the remote control device 200 of the present example has a function of receiving audio data wirelessly transmitted from the audio recording / reproducing device 100 or the like.
  • the output can be made from the headphone 208 described in the control device 200. That is, when audio processing is received by the wireless processing block 10, the audio data is supplied to the reproduction processing unit 206, and audio reproduction processing such as demodulation, analog conversion, and amplification is performed. It is possible to supply the output audio signal to the headphone 208 connected to the headphone terminal 207 and output it.
  • the remote control of the audio recording / reproducing device 100 can be performed from the control device 200. Further, the operation status of the audio recording / reproducing device 100 can be displayed on the display panel 203 provided in the remote control device 200. In addition, the audio reproduced from the disc by the audio recording / reproducing device 100 can be output from the headphone 208 connected to the remote control device 200. it can.
  • FIG. 4 is a diagram showing a protocol stack required for performing wireless communication over bluetooth.
  • the protocol of the entire bluetooth system is a protocol that is a major part of the bluetooth protocol, an application software that manages application services, and a core protocol. It is divided into three groups of conforming protocols for matching the communication protocol between the protocol and the application.
  • the blue score protocol consists of five protocols. It consists of a physical layer, baseband layer, actual data processing layer, and logical link management layer in order from the lower layer.
  • the conforming protocol group adapts the core protocol to the application software so that various existing application software can be used.
  • This set of conforming protocols includes, for example, T
  • a protocol that conforms to a port file corresponding to this conformance protocol group is prepared.
  • the protocol configuration required to transmit the AV / C data will be described later.
  • As the physical layer a frequency-hobbing spectrum spreading method using a 2.4 GHz frequency band is adopted. The transmission power is limited to a maximum of about 100 mW, and wireless transmission over a short distance up to about 100 m is assumed.
  • the physical layer is designed so that transmission power can be reduced to a minimum of 30 dBm by control from the link layer.
  • the baseband layer communicates the actual transmitted and received data packets to the physical layer. It is defined as a protocol that interfaces packets. This layer provides a communication link for transmitting and receiving data passed from the upper layer. At this time, frequency hopping management and time axis slot management are also performed. In addition, retransmission of the bucket and error correction and detection processing are also managed by the baseband layer.
  • the link management layer is one of the protocols for interfacing transmission / reception packets on the communication link.
  • the link management layer sets the communication link for the baseband layer and sets the link related to the link. Specify settings for various communication parameters. These are defined in the link management layer as control buckets, and communicate with the link management layer of the opposing terminal as needed. This layer is also directly controlled by higher-level applications as needed.
  • voice data is transferred after the link management layer sets a communication link through which data can be transmitted.
  • Voice data here is voice data used mainly for making telephone calls.
  • a dedicated processing layer is provided at a relatively lower layer.
  • the logical link management layer manages the logical channels with a protocol that interfaces with the link management layer and the base layer. Transmission data other than voice data handled by the voice layer is provided to the ethical link layer from a higher-level application, but the actual data taken there is a The data sent and received by the data layer is passed without regard to the size and timing of the evening bucket. Therefore, the logical link management layer manages the data of the upper application as a logical channel, and performs data division and data reconfiguration.
  • Fig. 5 shows the processing at each layer when wireless communication is performed between two devices.
  • a link is set, and packets are transmitted and received on the set link in the baseband layer.
  • control packets are transmitted and received on the communication link management channel.
  • a bucket of user data is transmitted and received on the logical channel. This user data corresponds to a stream data overnight command to be actually transmitted.
  • Fig. 6 shows the frequencies used in this method.As shown in Fig. 6, there are 79 communication frequencies at 1MHz intervals from 240MHz to 248MHz. I do. Each of the transmitted buckets occupies one of the 79 communication frequencies in the communication spectrum.
  • the communication spectrum used randomly changes (hops) every 625 / second.
  • FIG. 7 shows an example in which the communication frequency hops, and a particular evening is an imaging t.
  • the transmission frequency changes randomly every 6 to 25 seconds.
  • the communication frequency changes every 625 seconds, random hopping occurs about 1,600 times per second, and as a result, the data is spread and transmitted within the band shown in Fig. This means that spectral diffusion is taking place.
  • one unit of a packet is 625 seconds, but it is also possible to use a plurality of packets of one unit in succession to transmit. For example, when two-way transmission is performed between two devices, it is not necessary for the two-way communication to use the same number of buckets, and only one-way communication may use a plurality of packets.
  • the frequency hopping is performed every 625 seconds as shown in Fig.7.
  • the frequency hopping is performed every 625 seconds as shown in Fig.7.
  • three consecutive packets are used, or five consecutive packets are used. If used, the transmission frequency is fixed while the slot is continuous.
  • Fig. 10 The communication status between two devices is shown in Fig. 10.
  • the master, slave, and other slaves receive one slot ( (Slots of 625 seconds) (Fig. 1 OA), and during the next slot, data of the slot configuration is transmitted from the slave to the master (Fig. 10). B).
  • the alternate transmission is repeated as long as the transmission continues.
  • the frequency for wireless transmission is changed to frequency f (k), f (k + 1), f (k + 2)... For each slot as described above.
  • FIG. 11 is a diagram illustrating an example of a network configuration including a plurality of devices.
  • a communication system standardized as a Bluetooth not only such one-to-one wireless transmission but also a large number of devices can form a network. That is, when wireless transmission is performed between two devices, one device becomes a master and the other device becomes a slave, as shown on the left end of Fig. 11, and the master MA 11 controls the master device. Two-way wireless transmission is performed between MA 11 and slave SL 11.
  • three slaves SL 21, SL 22, and SL 23 controlled by one master MA 21 are prepared.
  • a network may be configured to perform wireless transmission between four devices. As shown on the right end of Fig. 11, three units MA31, MA32, MA33 and slaves SL31, SL32, SL3, which are individually controlled by each master, are shown. 3, SL 34, SL 35, and SL 36 are prepared, and three networks are configured.
  • a network consisting of one master and a slave that directly communicates with the master is called a piconet.
  • a group of networks having a plurality of masters that is, a group of networks composed of a plurality of piconets) is called a caster network.
  • the SC0 link is a connection type that performs one-to-one communication between the master and a specific slave, and is a so-called circuit-switched link.
  • This link is mainly used for applications that require real-time performance such as voice.
  • This SCO link secures a communication slot in advance at a fixed interval in the communication link in the piconet, and even if other data is transmitted in the middle, the data communication of the SCO link has priority. Is done. That is, as shown in FIG. 12, for example, the SC0 communication slot is mutually transmitted between the master and the slave at regular intervals.
  • This SCO link can support up to three SCO links simultaneously for one master.
  • one slave may support three SCO links, and another may support one SCO link for three different slaves.
  • the SC0 link does not have a retransmission function, and no error correction code is added to packets transmitted by the SC0 link.
  • the ACL link is a so-called bucket exchange type connection type, and one-to-many communication is possible between a master and a plurality of slaves. Instead of being able to communicate with any slave in the piconet, ⁇ ⁇ The effective communication speed of each slave may change depending on the number of slaves.
  • the SC0 link and the ACL link can be used together.
  • ACL link With the ACL link, one master can communicate with up to seven slaves at the same time. However, only one ACL link can be set in one piconet for each slave, and one slave cannot set multiple ACL links at a time. In order to operate this application, it is necessary to perform protocol multiplexing of the upper-level application. Unless specified otherwise, master-slave communication
  • a single-slot ACL bucket is used.
  • permission from the master is required in advance.
  • the master can reject a multislot ACL bucket transmission request from a slave, but the slave must always accept a transmission request from the master.
  • the master notifies the slave of only the upper limit of the multislot, and it is up to the slave to determine whether to transmit the multislot ACL ° packet.
  • whether the ACL packet transmitted from the master is single-slot or multi-slot depends entirely on the decision of the master, so the slave receives all multi-slot packets. You need to always be prepared.
  • ACL 0 packet provides the following three types of packet communication methods, apart from the definition of single slot and multi slot. O The first is the asynchronous communication method (Asynchronous transfer). The second is the isochronous transfer method (Isochronous transfer), and the third is the broadcast transfer method (Broadcast transfer).
  • the asynchronous communication method is a communication method for transmitting and receiving a normal bucket.
  • the data transmission speed depends on the threads that exist in the piconet. -Traffic volume of the traffic / ⁇ ⁇ Changes due to packet retransmission due to deterioration of communication line quality.
  • Figure 13 shows an example in which three slaves (slaves 1, 2, and 3) within the same piconet communicate using the asynchronous communication method.
  • An AL packet is transmitted to the slaves 1, 2, and 3 in order, and a packet for confirming reception is returned to the master from the slave that has received the ACL packet. .
  • stream data such as audio data and video data may be transmitted using an asynchronous communication method of an ACL bucket.
  • stream data is transmitted by the asynchronous communication method in this way, a time stamp is added to each ACL bucket so that continuity of stream data can be ensured on the receiving side. To do.
  • the isochronous communication method is a method in which a packet is always transmitted from a master to a slave within a predetermined time slot period. In this method, a minimum delay of transmitted data can be secured.
  • the slot interval is the maximum polling time and is agreed between the master and the slave before starting communication in the isochronous eggplant communication method. There is a need to.
  • the master can force the slave to specify the maximum polling interval and can reject a request for setting the isochronous communication system from the slave.
  • the slave cannot specify the maximum polling interval and cannot request the setting of the isochronous communication for the master and slave.
  • Figure 14 shows an example of communication between a master and a slave using the isochronous communication method. As shown in Fig. 14, within the maximum polling interval, the ACL bucket is transmitted to the slave from the master and the slave receiving the ACL bucket immediately after receiving the ACL bucket is received. Then, a packet for acknowledgment is returned to the master.
  • the broadcast method is set by setting the slave identifier in the bucket header to zero.
  • a broadcast bucket can be transmitted to all slaves from the master station.
  • the slave that receives the same packet does not transmit a packet for acknowledgment of the reception. Instead of the acknowledgment being received by the slave, the master sends the broadcast bucket several times in a row. The master must notify all slaves of the number of transmissions before performing broadcast.
  • Fig. 15 shows an example in which all slaves in a piconet are communicated using the broadcast method.
  • the portion with the X mark shows an example in which the packet at the slave could not be received at that time. This ensures that all slaves can be broadcast.
  • FIG. 16 is a diagram illustrating a communication example in which the SC0 link and the ACL link are used in combination.
  • the SC packet on the SC0 link is powerful, and the master sends data to the three slaves 1, 2, and 3 at any time in a situation where data is transmitted between the master and slave 1 at regular intervals. Has been sent. Also, broadcast packets are repeatedly transmitted a predetermined number of times. When the SC0 packet is transmitted while the broadcast packet is repeatedly transmitted, the SC0 packet is transmitted.
  • Table 1 summarizes the settings required for the isochronous eggplant communication method and the broadcast communication method.
  • the master and slave's internal communication will be described.
  • the frequency hobbing pattern, etc. is set using the internal clock of each device.
  • the clocks possessed by the master and the slave are set by, for example, a count value of a 28-bit counter from 0 to 27, as shown in FIG.
  • One step of this countdown is 32.5 ⁇ seconds, and this 32.5 ⁇ s is the minimum time unit for call and inquiry processing.
  • the count of 28 bits, in which the value is incremented by one every 32.5 seconds has a period of about 23 hours, and the randomness of the frequency hopping pulse. Is increasing.
  • the 312.2.5 // second period set by the clock value of the 0th bit is the time period of the transmission bucket when the master calls and inquires.
  • the period of 625 seconds set by the clock value of the first bit is the time period of the slot in which the communication frequency changes.
  • the cycle of 1.25 ms set by the clock value of the second bit is the transmission / reception time cycle of the master or slave.
  • the 1.28 second cycle set by the clock value of the 12th bit is the clock timing of the time cycle for changing the reception frequency in inquiry and calling.
  • Each slave looks up the master's clock, adds a certain offset value to its own clock to match the master's clock, and adds the added clock. Use communication for communication.
  • the 48-bit address assigned to each terminal is also used as a parameter.
  • the 48-bit address is an absolute address that is defined in an address manner in accordance with the IEEE 802 specification, and is individually assigned to each terminal of each blue tooth.
  • Fig. 18 is a diagram showing an example of the 48-bit address configuration.
  • the lower 24 bits are LAP (Lower Address).
  • the slave When entering the communication state, the slave is notified of the master's address, so each slave can independently calculate the same frequency hopping pattern as the master.
  • FIG. 19 is a diagram showing a configuration example for calculating a communication frequency.
  • the lower 28 bits of the mask address and the lower 27 bits of the 28-bit clock are supplied to the communication frequency selector 8 to form a channel frequency hopping pattern.
  • the communication frequency is determined uniquely.
  • the ringing frequency hopping pattern and the inquiry frequency hobbing pattern are channel frequency hopping. It is a different pattern from the turn.
  • the data configuration transmitted between the master and the slave will be described.
  • 2 0, o 0 Ke Tsu bets is a diagram showing a bucket tools Tofo one mouse DOO is divided rather large, access code, 0 Kek Bok header
  • Consists of three parts the payload.
  • the payload is set to a variable length according to the amount of data transmitted at that time.
  • FIG. 21 is a diagram showing a configuration of the access code.
  • the access code is composed of 68-bit or 72-bit data, indicates the destination of the transmission bucket, and is a code added to all the buckets transmitted and received. Depending on the type of packet, there may be only this access.
  • the preamble consists of a fixed 4-bit length that repeats 1 and 0 patterns according to the LSB of the sync word.
  • the trailer consists of 4 bits that repeat 1 and 0 according to the sink-gate MSB. Both functions function to remove the signal DC component of the entire access code.
  • the 48-bit sync word is a 64 bit data generated based on the 24 bit LAP of the 48 bit address. This sync word is used for piconet identification. However, a different sink code may be used for the bucket used for inquiries and calls, such as for communication when the address and clock cannot be obtained in the master area.
  • FIG. 22 is a diagram showing the configuration of the packet header.
  • the packet header is a part that contains the parameters required to control the communication link in the baseband layer.
  • the 3-bit AMADDR is an identification field for identifying a slave communicating in the piconet, and is a value assigned by the master to each slave.
  • the 4-bit TYPE is a packet type type field that specifies what kind of packet the whole packet is.
  • 1-bit FL0W is the bucket's bucket that communicates with the ACL link. This field is used to manage mouth control.
  • the 1-bit ARQ N is a 1-bit field used to notify the packet transmitting side whether the received packet contains an error.
  • a response packet dedicated to acknowledgment is not prepared, and the acknowledgment of the packet is transmitted to the source of the packet using the ARQN field.
  • the value of this field is 1 or 0, the other party is notified that the received bucket has no error or that there is an error.
  • the presence or absence of an error in the received bucket is determined by the header error detection code added to the bucket header of the received bucket and the error detection code added to the pay mouth.o
  • the 1-bit SENQ is a field used to manage retransmission buckets so that they do not overlap on the receiving side. When the same packet is retransmitted, the value is alternately inverted between 1 and 0 each time one packet is transmitted.
  • the 8-bit HEC is a field where a packet header error correction code is placed.
  • the error correction code, g (D) - is generated using a generator polynomial D 8 ten D 7 + D 5 + D 2 + D + 1.
  • the initial value set in the 8-bit shift register for generating the error correction code is set to the 8-bit UAP in the address for the bluetooth described above. .
  • the address used here is the same as the address used when generating the access code.
  • Table 3 summarizes the initial values used to generate this error correction code. (Table 3)
  • C AC channel access code
  • the pay mouth contains user data or control data actually transmitted and received between terminals.
  • User data includes data transmitted / received via the SC0 link and data transmitted / received via the ACL link of the packet exchange type.
  • FIG. 23 is a diagram showing the configuration of the pay mouth of the ACL link. . It consists of three parts: a payload header, a payload body, and an error detection code. The overall length of the payload is variable. On the other hand, the SCO link's pay slot has a communication slot that is periodically reserved in advance. Therefore, there is no retransmission of data packets, and only a payload board is used. No header and error detection code are added.
  • the payload header is a part that contains parameters necessary for controlling data in a layer higher than the baseband layer, and is a part that is included only in the ACL link.
  • Fig. 24 shows the configuration of a single-slot, zero- packet payload header
  • Fig. 25 shows the configuration of a multi-slot-no- zero payload header.
  • the 2-bit L-CH data included in the payload header is a field that identifies a logical channel that specifies what kind of data the data in the layer above the base node layer is. Field.
  • the SC link and the ACL link are links in the baseband layer, and their control is performed by information set in the packet header.
  • L-CH identifies a logical channel defined in a layer higher than the baseband layer. LCH is defined for three user logical channels as shown in Table 4 below.
  • FL0W is 1-bit data used to control the flow of data transmitted and received on the user logical channel.
  • the setting of this FLOW field is performed by the link management layer, but it does not guarantee real-time data flow control. All real-time data flow control is managed by the baseband layer using the FL0W field in the bucket header. All data in the control packet is processed by the link management layer and is not passed to the logical link management layer.
  • the 5-bit or 9-bit LENGTH is a field indicating the data length of the pay body in bytes. Single slot. In case of a packet, it is 5 bits, and it is a multi slot. In case of a ket, it is a 9-bit field.
  • UND EFI NED exists only in the payload of a multi-slot packet, is currently undefined, and is set to all zeros.
  • the payload body contains data of the length specified by LENGTH in the payload header.
  • LENGTH length specified by LENGTH
  • the CRC is a 16-bit field indicating an error detection code, and is a code for detecting whether there is an error in the payload header and the payload.
  • the initial value set in the 16-bit shift register is a 16-bit UAP of the addresses already described, which is obtained by adding 8 bits of zero to 8 bits of the UAP. Set the value.
  • the address used here is the same as the address used when generating the access code, similar to HEC.
  • the TYPE field specifies the bucket type. Describing the specified bucket type, there are a common bucket commonly used for the SCO link and the ACL link, and a packet power unique to the SC0 link or the ACL link.
  • the common bucket is NU LL ha. There are packet, P0LL packet, FHS bucket, DM1 packet, IQ packet, and ID packet.
  • the NULL bucket is a bucket composed of an access code and a bucket header, and has no payload.
  • the length of the bucket is fixed at 126 bits.
  • This packet is a packet for transmitting and receiving the state of the communication link, and manages the packet acknowledgment (ARQN) and the front-end control (FLOW). No packet acknowledgment of receipt of this NULL bucket is necessary.
  • the P0LL packet is a packet composed of an access code and a packet header, has a fixed length of 126 bits, and manages the state of the communication link. .
  • a response to the receipt of a POLL packet is transmitted even if there is no data to be transmitted, even if there is no data to be transmitted. There is a need.
  • the FHS bucket is an important control bucket for synchronization within the piconet, and the clock and clock, which are indispensable parameters for establishing synchronization between the smartphone and slave. Sent when changing addresses.
  • Figure 26 is a diagram showing an example of the configuration of the payload of the FHS bucket.
  • the payload of the FHS bucket consists of eleven fields, one for the 144 bits of the eleven fields.
  • the 34-bit parity bit is a field containing the parity for the sync word in the access code set in the FHS bucket.
  • the 24-bit LAP is FHS. It is the lower 24 bits of the address of the terminal transmitting the packet. 2 bits following LAP are undefined Field and set to 0.
  • the 2-bit SR indicates the number of repetitions when the master sends the ID bucket train to the slave in the call, and the scan when the slave scans the ID bucket train from the master. This is a 2-bit field that specifies the cycle.
  • the 2-bit SP specifies the time for the slave to perform the required call scan after the slave receives the IQ bucket from the master and sends the FHS bucket to the master in the inquiry. This is a field.
  • the 8-bit UAP is the upper 8 bits of the address of the terminal transmitting the FHS packet.
  • NAP 16-bit NAP is FHSS. It is 16 bits other than LAP and UAP in the address of the terminal transmitting the packet.
  • the 24-bit device class is a field that indicates the type of terminal.
  • the 3-bit AMADDR is a 3-bit field that allows the master and slave to identify the slave.
  • the slave identifier used in the piconet is specified in the FHS bucket transmitted by the master to the slave.
  • the FHSS packet transmitted by the slave in response to the IQ packet from the master station, A M
  • ADDR is meaningless and must be set to 0.
  • the 26-bit CLK 27-2 is a field indicating the upper 26 bits of the clock of the terminal. This clock has a clock accuracy of 1.25 ms, and when transmitting FHS packets, it is necessary to set the clock value at that time. .
  • the 3-bit page scan mode is a field that specifies the mode of the default call scan mode in which the terminal that transmitted the FHS bucket sabotts.
  • the DM1 packet will be described.
  • a DM1 packet is transmitted / received via the SC0 link, it always functions as a control packet.
  • data is transmitted / received through the ACL link, it is used not only to function as a control packet but also to transmit / receive a data bucket.
  • An IQ packet is a packet that the master broadcasts during an inquiry, and consists only of an inquiry access code.
  • the ID bucket is a bucket in which the master designates and transmits a specific slave in a call, and is composed of only a call access code.
  • the IQ and ID buckets are packets that are not defined in the bucket header type field.
  • the SC0 packet is composed of four types: an HVI packet, an HV2 packet, an HV3 packet, and a DV packet.
  • the payload of an HV 1 bucket consists of only a payload body, which contains 10 bytes of user data. SC Since the O packet is basically not retransmitted, this 10 byte does not include an error detection code. Then, the data is subjected to 13-rate error correction coding, and finally has a payload length of 240 bits.
  • the payload of the HV 2 bucket is also composed of only the payload body, which contains 20 tons of data. These 20 bytes do not include the error detection code. Then, the data is error-correction-coded at a rate of 2Z3, and finally has a pay-out length of 240 bits.
  • the payload of the HV 3 bucket also consists of a payload body alone, which contains 30 bytes of data. This 30 bits does not include an error detection code. No error detection coding is performed on the 30 bits.
  • the DV bucket is composed of a fixed-length, 10-byte audio portion and a variable-length data portion up to a maximum of 9 bytes.
  • the 10 bytes of the audio part do not include the error correction code, but the data part has two bytes for a maximum of 10 bytes with a 1-byte pay-head header.
  • An error detection code is added. -
  • ACL packets transmitted and received on the ACL link include DM1 packets, DH1 packets, DM3 packets, DH3 packets, and D3 packets.
  • M5 packets There are M5 packets, DH5 packets, and AUX1 packets.
  • DM 1 0 Kek Bok Pay load is, 1 and my payload Dohedda, and the variable length of the payload Dobodi of up to a maximum of 1 to 7 by me, consists of the code out error detection.
  • the configuration of the D H1 packet is the same as that of D M1.
  • the payload is not error correction coded. Therefore, variable length data of up to 27 bytes can be transmitted and received.
  • DM 3 0 Kek Bok Pay load is, of 2 Bok payload Dohedda And a variable-length payload body of up to 121 bytes and an error correction code.
  • the payload of these DM3 buckets is subjected to '2Z3 rate error correction coding.
  • DH 3 0 Kek Bok of the configuration is the same as that of the DM 3 bucket Bok configuration.
  • pay-per-mouth is not error-correction-coded. Therefore, at most
  • the pay mouth of the DM5 bucket consists of a 2-byte payload header, a variable-length pay-port body of up to 224 bytes, and a 2-byte error correction code.
  • the structure of the DH5 bucket is the same as that of the DM5 bucket.
  • the payload is not error correction encoded. Therefore, variable length data of up to 339 bytes can be transmitted and received.
  • AUX bucket Bok is the same as the DH 1 0 Kek bets may not include the 2-by-Bok error detection code. That is, there is no AUX 1 packet retransmission.
  • the pay mouth body can send and receive variable length data of up to 29 bytes by adding 2 bytes.
  • the transition state in this method consists of three phases related to communication and a low power consumption mode related to terminal power consumption. Get involved in communication
  • Fig. 27 is a diagram showing an example of state transition, in which there is a transition to the state indicated by the arrow.
  • the standby phase (S11) is a phase composed of one processing state and in which no bucket is transmitted or received. Immediately after turning on the terminal or disconnecting the communication link, Is in the standby phase. In this standby phase, there is no difference between the roles of master and slave.
  • the synchronization establishment phase is composed of two types: an inquiry (S12) and a call (S13).
  • Inquiry is the first stage of processing to establish intra-piconet synchronization.
  • the terminal attempting to communicate for the first time always transitions to inquiry after waiting.
  • a call is a processing state of the second stage that is performed to establish intra-piconet synchronization. Basically, a state transition is made from an inquiry.However, the first stage processing of intra-piconet synchronization establishment in an inquiry state If has already been completed, it may transition from waiting to calling directly.
  • the master in this processing state continuously broadcasts the IQ bucket regardless of whether there are slaves around.
  • the slave transmits an FHS bucket to the master every time an IQ bucket is received to convey the attribute.
  • the FHS packet allows the master to know the slave's address and clock.
  • FIG. 28 is a diagram showing processing performed by the master and slave in this inquiry state.
  • the master in the inquiry is FHS, from an unspecified number of slaves. You will receive the packet.
  • the problem is that multiple slaves transmit FHS packets to a specific IQ bucket at the same time. Multiple FHs at the same time
  • S-packet When an S-packet is sent, a packet collision occurs and the master is sent, making it impossible to determine the FHS packet.
  • bluetooth backs off random time when transmitting FHS packets.
  • the slave does not transmit the FHS packet to the master for the IQ packet received for the first time, and then suspends the reception of the IQ bucket for the duration of the random time back-off. After that, the slave resumes receiving IQ packets, and then sends the FHS bucket to the master immediately after receiving the IQ packet.
  • the slave receives the FHS bucket, it again suspends the IQ bucket reception for the random time. Thereafter, this operation is repeated.
  • Figure 29 shows the outline of the processing in the master and slave in this inquiry. Since the master does not notify the slave that the FHS packet has been received without error, the slave in the inquiry state will be in a state where only the FHS packet can be transmitted. However, since the same IQ packet is repeatedly broadcast for a certain period of time, the master receives a plurality of FHS buckets for each slave in the inquiry processing state. As a result, by continuing to make inquiries for a certain period of time, the reliability of sending and receiving FHS packets is improved.
  • the roles of the master and slave are different.
  • the master selects the slave to communicate with based on the information of the FHS packet sent and received by the inquiry, and sends the ID packet to the slave.
  • the master confirms the reception of the ID packet, it sends an FHS bucket to the slave. This allows the slave to know the master's address and clock.
  • a call access code is used as the access code for the ID and FHS buckets transmitted and received here.
  • FIG. 30 outlines the processing performed by the master and slave in the call.
  • the slave sends an ID bucket at the center to the slave, and the slave notifies the reception confirmation.
  • the master sends an FHS bucket to the slave, and the slave notifies the reception confirmation.
  • a call exchanges processing between a specific slave and the master. Since buckets can be sent and received on a one-to-one basis, the master and slave can perform processing while confirming the transmission and reception.
  • the slave that has received the ID bucket from the master sends the same ID bucket to the master and notifies the master of the reception confirmation.
  • the master sends an FHS packet to the slave, notifying the slave of its address and clock.
  • the slave receives this FHS packet without error, it sends an ID packet to the master to confirm the reception.
  • the address and clock information required for synchronization within the piconet have been exchanged between the master and the slave, along with the query processing.
  • Figure 31 is a diagram showing an example of processing between a master and slave during a call.
  • the communication connection fuse shown in the state transition diagram of FIG. 27 has a connection (S14) and a data transfer (S15).
  • the master and the slave synchronize within the piconet through the synchronization establishment phase, and are capable of performing actual communication.
  • no data bucket is sent or received.
  • the control packet for setting the communication link is transmitted and received. Limited to packets, security-related control packets, control buckets related to low power consumption mode, and so on.
  • Transmission and reception of data packets in data transfer are performed according to the rules of master, slave, and time slot. Also, if the terminal disconnects the data transfer due to data transfer, and if the controller in the terminal has a hard reset, the terminal changes from the data transfer to standby. State transition.
  • the low power consumption mode is a mode that provides a low power consumption state for terminals that transition from the connection.
  • the park mode is a slave-specific mode, and is a low power consumption mode that maintains synchronization within the piconet established by the connection.
  • Hold mode is a low power consumption mode in which both the smartphone and slave can shift, maintains the synchronization within the piconet established by the connection, and in the case of a slave, the slave receives the slave from the master and slave. This mode holds the identifier.
  • the sniff mode is a low power consumption mode specific to the slave.Similar to the hold mode, the slave maintains the synchronization within the piconet established by the connection, and the slave receives the master-supplied slave mode. This mode holds the Reeve identifier.
  • the master is specially connected to the piconet. Master-slave conversion can be performed with certain slaves.
  • processes related to security executed in the connection state of the communication connection file are roughly classified into two processes: authentication and encryption.
  • authentication process the connection between the user and a specific partner is determined to be permitted.
  • Encryption refers to protecting the data in transit from being intercepted by a third party.
  • a link key is a parameter that manages one-to-one security between two specific terminals.
  • This link key uses the initialization key used between the terminals trying to connect for the first time, and if a connection has been made in the past and the link key is set as a parameter in the database, , The set link key is used.
  • the initialization key is generated using the PIN code from the higher-level abbreviation and internally generated data.
  • Figure 32 shows the transmission configuration for transmitting this command and response.
  • FIG. 3 is a diagram showing a hierarchical structure.
  • the terminal that sends the command is called a controller
  • the terminal that receives the command and sends the response to the source of the command is called a target.
  • the relationship between the controller and the target is based on a concept different from the master and slave described above, which are necessary for managing the communication connection. Yes, basically, either may function as a master or slave terminal.
  • the baseband layer there is a layer that processes the L2CAP bucket for transmitting data of the control protocol, and on top of that, the AVCTP (Audio / Video Control Transport Protocol)
  • a protocol is prepared, and a protocol called AVZC command for controlling AV equipment is prepared on the protocol.
  • Fig. 33 shows an example of the data structure of L2CAP and 0 packets for transmitting the protocol data.
  • a header is added to the beginning of the section of the payload of this bucket (the part indicated as L2CAPE header), and the data length (1 ength) and the channel ID are indicated. Subsequent sections become the actual information (information).
  • the information section consists of an AVCTP header and an AVCTP header.
  • the data of the AVCTP message is “0000” data (4 bits) indicating that it is AV / C data, and the command type Z response data (which indicates the command type and response type). 4 bits), data indicating the unit type (5 bits), data indicating the subunit ID (3 bits), operation code (opcode) indicating the function (8 bits), Operands (operand: 8 bits), which are data associated with the function, are arranged as operands [0], operand [1], ...... operand [n] (n is an arbitrary integer). Have been.
  • the data configuration of AVCTP shown in Fig. 33 is “0000” data (4 bits) indicating that it is AV / C data, and the command type Z response data (which indicates the command type and response type). 4 bits), data indicating the unit type (5 bits), data indicating the subunit ID (3 bits), operation code (opcode) indicating the function (8 bits), Operands (operand: 8 bits), which are data associated with the function, are arranged as operands [0], operand [1],
  • FIG. 34 is a diagram illustrating a state in which a command and a response are wirelessly transmitted between the controller and the evening getter.
  • the controller When there is some kind of user on the controller side terminal and it is necessary to send a command to the target device, the controller establishes a connection to the target device in the evening. Then, the AVZC command is transmitted from the controller to the evening getter in the established connection (step S32). In the evening after receiving this command, a response to the command is transmitted to the controller (step S33). Then, if necessary, the processing for the command is executed in the evening. If the command is to check the status of the target, the requested data is sent back to the controller as a response.
  • step S34 when the process of disconnecting the connection is executed by the user operation on the controller side or by the user operation on the evening side, the command is issued. And a connection process for removing the connection set for transmitting the response is executed (step S34).
  • FIG. FIG. 36 shows the data structure of a section transmitted as an AVZC command (that is, AVCTP data in this example) in 8-bit units.
  • CTS command set ID
  • a VZC command frame and response frame are exchanged.
  • Responses to commands are to be made, for example, within a specified time period. However, in some cases, a provisional response is sent within a specified period and a formal response is sent after a certain period of time.
  • CTS indicates the ID of the command set.
  • the response to the (CONT ROL) command includes "NOT IMPLEMENTED”, “Accept”, “ACCEPTED”, “REJECTED”, and “Tentative” ( I NT ERIM). “Not implemented” for the response to the status (STATUS) command
  • the subunit type is provided to specify the function in the device.
  • the subunit type is harmed by a tape recorder, a tape reccorder / player, a tuner, and the like.
  • BBS Pre-Template Subunit
  • opcode indicates the command
  • operand indicates the command parameters
  • additional fields additional operands
  • FIG. 37 shows a specific example of the AVZC command.
  • the left side of Fig. 37 shows a specific example of the command type Z response.
  • the upper part of the figure represents the command, and the lower part of the figure represents the response.
  • "0 0 0 0" contains the control (C0NTR0L) and "0
  • Fig. 37 shows a specific example of the submit type.
  • "0 0 0 0 0” is a video monitor
  • "0 0 0 1 1” is a disc recorder Z player
  • "0 0 1 0 0” is a tape recorder Z player
  • "0 0 0 1” Is a tuner
  • "0 0 1 1 1” is a video camera
  • "0 1 0 1 0” is a sub-unit used as a bulletin board called BBS (Bulletin Board Subunit)
  • “1 1 1 “0 0” is a subunit type (Vender unique) unique to manufacturing
  • “1 1 1 1 0” is a specific subunit type (Subunit type extended to next byte).
  • BBS Billerin Board Subunit
  • a unit is assigned to "11", which is used when it is sent to the device itself, such as turning the power on and off.
  • FIG. 37 shows a specific example of an operation code (operation code: opcode).
  • operation code operation code: opcode
  • the opcodes for the case where the subunit type is a tape recorder Z player are shown.
  • Operands are defined for each operation code.
  • "00h” is a manufacturer-specific value (Vender dependent)
  • "50h” is search mode
  • 51h is time code
  • 52h is A.
  • Figure 38 shows a specific example of the AV / C command and response.
  • the operation code becomes "C3h” which means playback. (See Figure 37.)
  • the operand is "75 h” which means forward direction (F 0 RWA RD), and when played back, the evening getter is the one shown in Figure 38B.
  • a panel submit is provided as a device to be controlled by the data of the AVDCP protocol.
  • devices controlled by the AVDCP protocol are called sub-units for each functional unit, and there is a device called panel sub-unit as one of the sub-units. .
  • This panel submit for example, —
  • a control device such as a remote control device
  • a panel for a GUI (Graphics User Interface) related to operations that can be executed on the controlled device was displayed, and key operations corresponding to the display of the panel were performed. Then, the display function on the panel specified by the key is executed.
  • control is performed using, for example, a pass-through command.
  • the pass-through command will be described later.
  • the audio recording / reproducing apparatus 100 has audio data as a subunit.
  • a disk unit 100a for recording and reproducing data on and from a disk is provided, and a panel unit 100b for executing an operation on the disk unit 100a is provided.
  • the panel subnet 100b is configured using, for example, the CPU 110 shown in FIG. 2 and a part of its peripheral memory. Note that the CPU 110 is also used as a control means of the disk unit 100a.
  • the remote control device 200 sends a control command C 1 to the panel subunit 100 b to operate the audio recording / reproducing device 100.
  • the operation of the audio recording / reproducing device 100 is remotely controlled by sending a control command C2 to the disk subunit 100a.
  • the control command C1 is sent to the panel subunit 100b to remotely control the operation of the audio recording / reproducing apparatus 100, basic operations such as recording and reproducing on a disc are performed. It is common to control the operation.
  • a control command C2 is sent to the disc subunit 100a to remotely control the operation of the audio recording / reproducing apparatus 100, relatively complicated control such as editing of a disc is required.
  • a control command for a basic operation such as reproduction may be sent as the control command C2. Therefore, in this example, there are two routes for transmitting the control data, a route for sending the control command C 1 and a route for sending the control command C 2.
  • the audio data reproduced from the disk by the disk subunit 100a is directly transmitted from the disk subunit 100a to the remote control device 2 as data D1. It is transmitted wirelessly to 0.0.
  • FIG. 40 shows another example of an audio recording / reproducing apparatus 100 ′ .
  • a disk subunit 100 a ′ and a panel subunit 100 b ′ are provided. Only the panel subunit 100b 'can receive the control command C1 from the remote control device 200, and the disksubunit 100a' directly receives the control command. There are cases where the configuration cannot be received. Even in this case, the audio data reproduced from the disc by the disc subunit 100a 'is directly transmitted as data D1 from the discsubunit 100a' side to the remote core. It is wirelessly transmitted to the control device 200.
  • FIG. 41 is a diagram showing a configuration of a pass-through (PASSTHROUGH) command transmitted to the panel subunit.
  • Opcode of section, code (7 C i 6) indicating that the pass-through command is added.
  • a state flag is placed in the first bit, and an operation ID is placed in the remaining 7 bits.
  • the data of the operation data arranged in the section following the operand [2] is arranged in a long time, and in the section following the operand [2].
  • Operation data is placed.
  • the number with ( 16 ) added is the value of the hexadecimal value (0, 1,... 9, A, B... F) represented by 4-bit data. Shown).
  • various operations are assigned to each code value. For example, a code for instructing the direction and selection of up and down on the GUI screen, a code for instructing selection of the menu screen, and audio devices such as play, stop, record, fast forward, and rewind. Code to directly instruct the operation of video equipment has been assigned.
  • FIG. 43 shows a configuration example of a command sent from the remote control device 200 for this purpose.
  • the data shown in the upper part of FIG. 43 is arranged in each of the data sections shown in FIG.
  • the command type is [STATUS] or [STABLE] to inquire the status. Since the destination of this command is for the corresponding device as a whole, it is a unit.
  • the section of the operation code is a vendor-dependent value indicating that the code is specific to the manufacturer. In the section of the operand [0], the company identifying the manufacturer is displayed.
  • the audio recording / reproducing device 100 can perform the control specified by the command.
  • a remote control device is used as a response to the data on the
  • the basic data structure of this response is the data structure shown in the upper and middle sections of Fig. 43.
  • the corresponding data is returned. It is arranged as Specifically, as shown in the lower part of Fig. 43, the data on the number of corresponding subnets and the data of the subnet type, which is the code for identifying the corresponding subnet type, are compared with the corresponding subnets. Add as many as the number of birds.
  • FIG. 45 and FIG. 46 show examples of such an inquiry, and FIG. 45 shows an example in which the remote control device 200 is used.
  • the status command is a function type, the sub-unit type that the command supports (corresponds to), and the data section specific to the function type is the maximum value FF. Keep it.
  • the data of the function type is returned as it is, and the command at this time is supported in a data section specific to the function type. Since the number of sub-units is 2, 0 2 indicating two sub-units is placed. Subsequent to the data of the number, there are arranged a disc-subunit, which is a data indicating a sub-sub type to be subscribed, and a sub-unit-type data indicating a panel sub-unit.
  • FIG. 46 shows that the remote control device 200 is shown in FIG. This is an example in which a command is sent to the recording / reproducing device 100 '.
  • a task command it is a function type, and the command is a type of sub-unit that the command supports (supports).
  • the maximum value is FF And keep it.
  • the data of the function type is returned as it is, and the number of sub-units that support the command at this time in the data section unique to the function type. Since 1 is 1, 0 1 is placed to indicate that it is one subnet. Subsequent to the number data, there is arranged a sub-unit type data indicating a panel sub-unit, which is a data indicating a supported sub-unit type.
  • 0 3 may be displayed.
  • FIG. 44 shows an example of the data configuration in this case.
  • the data shown in the upper part of FIG. 44 is arranged in each of the data sections shown in FIG.
  • the command type is [STATUS] or [STABLE] for inquiring the status. Since the destination of this command is for the entire corresponding device, it is a unit.
  • the operation code section is a vendor-dependent value indicating that the code is specific to the manufacturer.
  • a power management ID for identifying the manufacturer is arranged.
  • data is placed to check which commands can be controlled. As shown in the middle part of Fig.
  • the code after the operand [1] is the code of the AVDCP protocol as the category one code at first. Is shown, and the data about the application corresponding to the next inquiry is placed. Finally, a data section unique to the application is placed. In the data section specific to the application, a specific value (for example, a value in which the maximum value F follows an arbitrary number of digits) is assigned by the command from the remote control device 200. Is done.
  • the audio recording / reproducing device 100 When this command is sent from the remote control device 200 to the audio recording / reproducing device 100, the audio recording / reproducing device 100
  • data relating to the application specified by the command is sent to the remote control device 200 as a response.
  • the basic data structure of this response is the data structure shown in the upper and middle sections of Fig. 44, and the data section corresponding to the application corresponding to the application shown in the lower section of Fig. 44 Is placed as the answer.
  • the data on the number of corresponding applications and the application that is a code for identifying the corresponding application type are shown. Add the number of data of the event data as many as the number of compatible application types.
  • an application executable by the recording / reproducing device 100 can be understood.
  • the details of the application thus determined may be displayed on the display panel 203 attached to the remote control port device 200, for example.
  • transmission is performed on a network that performs wireless transmission according to a standard called Bluetooth, but similar control data is used for other wireless transmission networks. Transmitting overnight In this case, the processing of the present invention can be applied.
  • an inquiry command for checking whether control by a predetermined command is possible is transmitted using a wireless transmission network, and the response is obtained by obtaining the response. It becomes easy to determine whether the device on the side can be controlled by a predetermined command. Therefore, when controlling a partner device, it is possible to easily and reliably determine which command to use, and control of the device using the wireless transmission network can be performed well.
  • the response as a response to the inquiry command returns the code of the name of the corresponding sub-unit in the device, so that the name of the sub-unit corresponding to the predetermined command is returned.
  • the number of subunits corresponding to a given command can be reduced by returning the number of corresponding subunits in the device. You will understand.
  • the device that receives the response displays an indication of the function that can control the other device based on the data obtained in the response, and the user can control the other device based on the display.
  • the mode can be easily known, and the operation for remote control of the partner device can be performed well.
  • an inquiry command is transmitted using a wireless transmission network to determine whether control corresponding to any application is possible, and a response is obtained. It becomes easy to determine which application can control the device on the side. Therefore, when controlling a partner device, it is possible to easily and reliably determine which application can be controlled, and control of a device using a wireless transmission network. You can do it well.
  • the device in response to the inquiry command, the device returns the code of the name of the corresponding application, so that the name of the corresponding application can be understood. .
  • the device in response to the inquiry command, the device returns codes corresponding to the number of compatible applications, so that the number of compatible applications can be determined. i become.
  • the device that receives the response displays an application that can control the device of the other party based on the data obtained in the response, and based on the display, the user can use the device of the other party.
  • the user can easily know the controllable mode, and the operation for remote control of the partner device can be performed well.
  • a wireless transmission network for performing wireless transmission between audio devices or video devices is configured.
  • remote control of another device is performed from a specific device in the network, it is easy to determine in what manner the device can be controlled, and good control in the network can be performed.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Small-Scale Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil qui est télécommandé efficacement par le biais d'un réseau de transmission radioélectrique du type Bluetooth. Au moment de la transmission d'une commande et de sa réponse selon un format préétabli, entre des premier et second appareils dans un réseau, une commande d'identification d'application est envoyée pour demander si le second appareil peut être contrôlé sur la base d'une commande prédéterminée à partir du premier appareil, en transmission via un premier canal sur le réseau (du premier vers le second appareil), ou bien à défaut pour identifier l'application à laquelle le second appareil est adapté. Le second appareil transmet une réponse suite à la commande d'identification. Ainsi, un appareil peut déterminer rapidement la fonction d'un autre appareil.
PCT/JP2001/004284 2000-05-22 2001-05-22 Procede, systeme et dispositif de transmission de donnees WO2001091504A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-150545 2000-05-22
JP2000150545 2000-05-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118301678A (zh) * 2024-04-26 2024-07-05 广芯微电子（广州）股份有限公司 一种高数据率无线通信方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0847058A (ja) * 1994-08-02 1996-02-16 Sony Corp 入力機器選択方法
JPH09326812A (ja) * 1996-06-04 1997-12-16 Sony Corp 通信制御方法、通信システムおよびそれに用いる電子機器
JP2000122853A (ja) * 1998-10-14 2000-04-28 Canon Inc 複合装置及び前記装置における制御方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0847058A (ja) * 1994-08-02 1996-02-16 Sony Corp 入力機器選択方法
JPH09326812A (ja) * 1996-06-04 1997-12-16 Sony Corp 通信制御方法、通信システムおよびそれに用いる電子機器
JP2000122853A (ja) * 1998-10-14 2000-04-28 Canon Inc 複合装置及び前記装置における制御方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118301678A (zh) * 2024-04-26 2024-07-05 广芯微电子（广州）股份有限公司 一种高数据率无线通信方法及系统

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