WO2002056548A1 - Procede de transmission de donnees, emetteur de donnees, support d'enregistrement et programme - Google Patents
Procede de transmission de donnees, emetteur de donnees, support d'enregistrement et programme Download PDFInfo
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- WO2002056548A1 WO2002056548A1 PCT/JP2002/000246 JP0200246W WO02056548A1 WO 2002056548 A1 WO2002056548 A1 WO 2002056548A1 JP 0200246 W JP0200246 W JP 0200246W WO 02056548 A1 WO02056548 A1 WO 02056548A1
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- command
- data
- wired network
- data transmission
- predetermined
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/02—Inter-networking arrangements
Definitions
- the present invention relates to a data transmission method and a data transmission apparatus using both a wireless network and a wired network, a program applied to these data transmission, and a recording medium storing the program.
- the wired serial data bus standardized as the IEEE (The Institute of Electrical and Electronics Engineers) 13 9 4 system is used to configure a wired network that connects multiple devices. It has been proposed to perform data transmission.
- audio devices and video devices (hereinafter referred to as AV devices) that can be connected to the IEEE 1394 bus line have been developed, and by configuring a network with these AV devices, Audio data and video data can be transmitted between devices o
- AVZC command AV / C Command Transaction Set
- the IEEE 1 3 9 4 details details ⁇ beauty AVZC command scheme, g is yourself mounting on AV / C Digital Interface Command Set General S pecif ication being published in 1394 Trade Association, Ru 0 '
- a wireless network (wireless network) has recently been used using a wireless transmission system of a standard called Bluetooth (trademark). Network) has been proposed and is being put into practical use.
- This wireless network transmits audio data for telephone communication, image data for facsimile, computer data, etc. wirelessly using a 2.4 GHz frequency band between multiple devices.
- the wireless transmission distance between the devices is assumed to be a relatively short distance network from several meters to a maximum of about 100 m.
- a profile is defined that specifies how the data is transmitted overnight.
- Bluetooth SIG which is a standardization organization that defines the standards
- AVCTP Audio / Video Control Transport Protocol
- a network connected by a wired bus line such as the above-mentioned IEEE 1394 system and a network that performs wireless transmission such as a bluetooth are constructed separately. Therefore, for example, it has been impossible to transmit a command between a device compatible with the IEEE 1394 standard and a device compatible with Bluetooth. That is, the prescribed command configuration differs for each network, and it is virtually impossible to transmit commands received on the wireless network side to the wired bus line as it is, for example. .
- the wireless network and the wired network are basically individually constructed networks, it is necessary to perform management processing for setting the data transmission source and destination for each network. Yes, simply by changing the command configuration, two network It is not possible to transfer data between computers.
- the IEEE 1394 system is taken as an example of a network connected by a wired bus line
- a bluetooth is taken as an example of a wireless network. Similar problems arise when using similar wired and wireless networks. Disclosure of the invention
- An object of the present invention is to enable a command generated in a wireless network to be transmitted well to a device connected to a wired network.
- the first invention is characterized in that when a device control command is transmitted from a second device via a predetermined wireless network to a first device connected to a predetermined wired network, The device determines the received device control command, and if it determines that the received command is a command for controlling a predetermined device connected to the wired network.
- This is a data transmission method that transmits data to a predetermined device via a wired network.
- the process of determining a predetermined device from the received command is performed by a device that matches the content specified by the command. This is the process of searching for devices connected to the wired network.
- a third invention is the data transmission method according to the second invention, wherein the first device checks the functions of the devices connected to the wired network in advance, and stores data relating to the checked functions.
- a fourth invention is the data transmission method according to the first invention, wherein the first device determines a predetermined device from a received command by transmitting stream data within a wired network.
- the process of determining the predetermined device from the received command is performed by a device registered in advance in the first device. This is the process of determining the device.
- a command received as a wireless signal is converted into a data configuration for a wired network and transmitted to the wired network. It is intended to be.
- the seventh invention is a data transmission method according to the first invention, wherein
- the device control command from the device is an AVCTP protocol command, and the command for controlling a predetermined device is an IEEE 1394 AV / C command.
- a wireless network can be used as a wireless network using the AVCTP protocol or the like, and an IEEE 1394 system using AV / C commands can be used as a wired network.
- a network such as this can be used, and commands can be easily exchanged between the two networks.
- a first communication means to which a bus line constituting a predetermined wired network is connected to enable bidirectional data communication with other devices in the wired network;
- a second communication means capable of performing bidirectional data communication by performing wireless communication with other devices constituting the device, and, when a predetermined device control command is received by the second communication means, the device control that has been received
- a data transmission device comprising: a control unit that determines a destination of a command of a command and, when the determined destination is a device connected via a wired network, transmits a device control command from the first communication unit. It was done.
- the destination determining process of the device control command in the control means includes connecting a device matching the content specified by the command to a wired network. This is the process of searching from the devices that have been used.
- the data transmission device can be Judgment of the contents to be instructed-only makes it possible to easily determine where to send commands within the wired network.
- the control means preliminarily checks a function of a device connected to the wired network, stores data related to the checked function, and stores the stored data. Is used to search for a device that matches the content specified by the command.
- the destination determining process of the device control command in the control means is a source of the stream data in the wired network.
- Equipment is determined to be the destination.
- the destination determining process of the device control command in the control means is a process of determining a device registered in advance as the destination.
- the data transmission apparatus further comprises a conversion unit that converts the command received by the second communication unit into a command transmitted by the first communication unit. '' This makes it easier to deal with different command configurations between wired and wireless networks.
- the fourteenth invention is the data transmission device according to the eighth invention, wherein
- the predetermined device control command by the communication means is an AVCTP protocol command
- the device control command by the first communication means is an IEEE1394-type AV / C command.o
- AVC as a wireless network
- a network such as bluetooth using the TP protocol can be used, and a network such as IEEE1394 using the AV / C command can be used as a wired network. Commands can be easily exchanged between workpieces.
- the first S invention is a device for transmitting a device control command from a second device via a predetermined wireless network to a first device connected to a predetermined wired network.
- the other device judges the received device control command, and if the judgment indicates that the command is to control a predetermined device connected to the wired network, the corresponding command is sent to the wired network.
- Via a recording medium on which a program for executing a process to be transmitted to a predetermined device via a computer is recorded.
- the first device when a device control command is transmitted from a second device to a first device connected to a predetermined wired network via a predetermined wireless network, the first device , Judge the received device control command, and connect to the wired network
- the program is a program for executing a process of transmitting the command to the predetermined device via a wired network.
- the device control command sent from the device on the wireless network side can be transmitted to a specific device in the wired network, and is configured by being connected by a wired bus line.
- Devices in a network can be controlled remotely by wireless commands
- FIG. 1 is a block diagram illustrating a system configuration example according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration example of the monitor receiver according to the embodiment of the present invention.
- FIG. 3 is a block diagram showing a configuration example of a mobile phone terminal according to one embodiment of the present invention.
- FIG. 4 is a block diagram illustrating a configuration example of the short-range wireless communication unit according to the embodiment of the present invention.
- FIG. 5 is an explanatory diagram showing an example of a frame structure defined by the IEEE1394 system.
- FIG. 6 is an explanatory diagram showing an example of the relationship between a plug, a plug control register, and a transmission channel.
- FIG. 7 is an explanatory diagram showing an example of the relationship between the .AV / C command and the response.
- FIG. 8 is an explanatory diagram showing an example of the relationship between the AV / C command and the response in more detail.
- FIG. 9 is an explanatory diagram showing an example of the data structure of the AVZC command.
- Figure 10 is an explanatory diagram showing a specific example of the AVZC command.
- Figure 10A is an example of the command type (C type) and response.
- Figure 10B is an example of the submit type.
- Figure 10C is the operation code.
- FIG. 4 is a diagram showing an example of the operation code (operation code).
- FIG. 11 is an explanatory diagram showing a specific example of the command and response of the AV / C command.
- FIG. 11A shows an example of the command
- FIG. 11B shows an example of the response.
- FIG. 12 is an explanatory diagram showing an example of the protocol stack.
- FIG. 13 is an explanatory diagram illustrating an example of a hierarchical structure of wireless transmission.
- FIG. 14 is an explanatory diagram showing an example of setting a transmission frequency.
- FIG. 15 is an explanatory diagram showing a state of frequency hobbing.
- FIG. 16 is an explanatory diagram showing an example of the arrangement of single slot packets on a time axis.
- Figure 1 7 is an explanatory diagram showing an example of singles lots 0 Kek preparative and Maruchisuro' DOO 0 Kek bets are mixed on the time axis.
- FIG. 18 is an explanatory diagram showing an example of a transmission state between the master and the slave.
- FIG. 18A shows transmission from the master
- FIG. 18B shows transmission from the slave.
- FIG. 19 is an explanatory diagram showing an example of a network configuration.
- FIG. 19A is an example with one master and one slave
- Fig. 19B is an example with multiple slaves
- Fig. 19C is an example with multiple masters.
- FIG. 20 is a timing diagram showing a communication example of the SCO link, where FIG. 20A shows transmission from the master and FIG. 20B shows transmission from the slave.
- Fig. 21 is a timing diagram showing an example of communication using the asynchronous communication method.
- Fig. 21 A shows transmission from the master
- Fig. 21 B shows transmission from slave 1
- Fig. 21 C shows transmission from slave 1.
- the transmission from slave 2 is shown in Fig. This indicates transmission from the third node.
- FIG. 22 is a timing diagram showing a communication example of the isochronous eggplant communication system.
- FIG. 22A shows transmission from a master
- FIG. 22B shows transmission from a slave.
- Figure 23 is a timing diagram showing a communication example of the broadcast method.
- Figure 23A shows the transmission from the master
- Figure 23B shows the reception at slave 1
- Figure 23C shows the slave.
- 2D and Fig. 23D shows reception at slave 3.
- Fig. 24 is a timing diagram showing an example of communication when the SC0 link and the ALC link are used together.
- Fig. 24A shows transmission from the master
- Fig. 24B shows transmission from the slave
- 24C shows the transmission from slave 2
- FIG. 24D shows the transmission from slave 3.
- FIG. 25 is an explanatory diagram showing a configuration example of clock data.
- FIG. 26 is an explanatory diagram showing a configuration example of the address.
- FIG. 27 is a configuration diagram illustrating an example of processing for generating a frequency hobbing pattern.
- FIG. 28 is an explanatory diagram illustrating an example of a bucket format.
- FIG. 29 is an explanatory diagram showing a configuration example of the access code.
- FIG. 30 is an explanatory diagram illustrating a configuration example of a packet header.
- FIG. 31 is an explanatory diagram showing a configuration example of a pay mouth.
- FIG. 32 is an explanatory diagram showing an example of a configuration of a single-slot-no- zero payload header.
- FIG. 33 is an explanatory diagram showing a configuration example of a payload header of a multi-slot bucket.
- Fig. 34 is an explanatory diagram showing an example of the configuration of the payload of an FHS packet.
- FIG. 35 is an explanatory diagram showing an example of device state transition.
- FIG. 36 is an explanatory diagram showing an example of communication of an inquiry. Indicates transmission of an IQ bucket, and FIG. 36B indicates transmission of an FHS bucket.
- FIG. 37 is a timing diagram showing an example of processing of an inquiry.
- FIG. 37A shows transmission from the master, and
- FIG. 37B shows transmission and reception at the slave.
- Fig. 38 is an explanatory diagram showing an example of call communication.
- Fig. 38 A shows an example of transmitting a master power ID 'bucket to a slave.
- Fig. 38 B shows an example in which a master transmits an FHS packet to a slave. An example of transmission is shown.
- FIG. 39 is a timing diagram showing an example of a call process.
- FIG. 39A shows transmission from a master
- FIG. 39B shows transmission from a slave.
- Fig. 40 is an explanatory diagram showing an example of a hierarchical structure in AVDCP.
- Fig. 41 is an explanatory diagram showing an example of a bucket configuration at the time of AVDCP data transmission.
- Fig. 41A is an explanatory diagram of the entire bucket.
- FIG. 41B shows an example of a payload, and
- FIG. 41C shows an example of an AVCTP message.
- Fig. 42 is an explanatory diagram showing an example of establishing a connection in .AVDCP and transmitting commands and responses.
- FIG. 43 is an explanatory diagram showing an example of release connection in AVDCP.
- FIG. 44 is an explanatory diagram showing an example of a data structure in AVDCP.
- FIG. 45 is an explanatory diagram showing a format example of the pass-through command. .
- FIG. 46 is an explanatory diagram showing an example of the operation ID of the slewing command.
- FIG. 47 is an explanatory diagram illustrating an example of command transmission according to an embodiment of the present invention.
- FIG. 48 is a flowchart showing an example of device information collection processing according to an embodiment of the present invention.
- FIG. 49 is a flowchart illustrating an example of a command destination determination process according to an embodiment of the present invention.
- FIG. 1 is a diagram showing an example of the network configuration of the present example.
- AV devices such as a monitor receiver 1, a video cassette recording / reproducing device 2, a hard disk recording / reproducing device 3, and a tuner 4 are connected to the IEEE 1394 They are connected by a system bus line, and video data, audio data, control commands, etc. can be transmitted between the devices.
- the monitor receiver 1 of the present example includes a wireless signal transmission / reception unit so as to function also as a device in a wireless network called Bluetooth.
- the wireless network is composed of three devices: a monitor receiver 1, a mobile phone terminal 5, and some data terminal 6. Even within this wireless network, control commands and various data can be transmitted wirelessly.
- the mobile phone terminal 5 of this example is designed to also function as a remote control device for controlling the AV device.
- the remote control of the AV device is performed by operating a predetermined key arranged on the mobile phone terminal 5. Commands as remote control port signals, and wireless networks.
- the wireless transmission is performed to the monitor receiver 1 via the wireless LAN.
- the monitor receiver 1 When a command for remotely controlling the AV device is transmitted by operating a predetermined key arranged on the mobile phone terminal 5, the monitor receiver 1 receiving the command transmits the command via the bus line as necessary. This allows commands to be transmitted to other AV equipment. The details of the command relay processing via the monitor receiver 1 will be described later.
- FIG. 2 is a diagram illustrating a configuration example of the monitor receiver 1.
- the monitor 1 of this example receives and processes video data supplied from a video device connected via a bus line, and displays an image on a display display of the receiver. Things.
- a video data receiving block 31 for performing a receiving process
- a video display section 32 for displaying the video data received and processed by the receiving block 31 on a display.
- An IEEE 1394 bus processing unit 10 for transmitting data via an IEEE 1394 bus line, and a wireless network for performing wireless transmission for a wireless network And a processing unit 20.
- the configuration of the IEEE 1394 bus processing unit 10 includes a port unit 11 to which one or a plurality of signal lines constituting an IEEE 1394 bus line is connected, and transmission to the bus line.
- An interface block 12 is provided for performing a conversion process between data and data processed inside the receiver 1.
- the video data received via the bus line is supplied to the video data reception block 31 via the interface block 12, and the display unit 3 executes display processing.
- the control command is supplied to the panel controller 13 connected to the interface block 12, and the panel controller 13 is connected to the panel sub-unit 14 and the monitor sub-unit. 15 Based on the command received in 5, And sends various instructions related to video display on the reception block 31 and the display unit 32.
- the panel controller 13 in the IEEE1394 bus processing unit 10 controls transmission on the bus line.
- the controller 13 also holds data necessary for this control. Specifically, for example, the controller 13 collects a subnet configuration of a device on a wired network connected by a bus line, and stores the collected configuration in a memory in the controller 13.
- the controller 13 also collects information on whether each device in the wired network supports a control command called a pass-through command and stores it in the memory inside the controller 13. Hold it.
- the configuration of the wireless network processing unit 20 is such that the short-range wireless communication unit 22 connected to the antenna 21 generates a wireless signal to be transmitted to another terminal in the wireless network. Transmission processing and reception processing for receiving a signal wirelessly transmitted from another end in the wireless network are performed.
- the signal received by the wireless communication unit 22 is converted by the wireless network interface unit 23 into data to be processed inside the receiver 1, and is supplied to the panel subnet 24. Also, the data supplied from the panel subnet 24 is converted into a data configuration to be transmitted wirelessly by the wireless network interface 23, and the converted data is supplied to the wireless communication unit 22. It is configured to perform wireless transmission.
- the panel subunit 24 instructs the monitor subunit 15 provided in the IEEE1394 bus processing unit 10 side, and based on the command received by the radio signal, the video display unit 32 Operation of the receiver, such as video display, can be controlled.
- the IEEE 13 9 4 bus Z wireless network conversion unit 25 is provided, and the command received as a wireless signal by the wireless network processing unit 20 is sent to a wired network connected to this receiver via a bus line.
- the conversion unit 25 converts the command to a command of a one-time configuration that is transmitted via an IEEE1394 bus line.
- the transmitted command is transmitted to the panel controller 13 on the IEEE1394 bus processing unit 1Q side.
- the conversion process for example, the header part of the command data of the Bluetooth format is removed, and the destination data on the bus line is added, and the IEEE 1394 bus line is added. And the data structure to be transmitted.
- the conversion unit 25 determines the destination of the converted command on the bus line by a predetermined process.
- the processing at this time is, for example, a process in which the interface block 12 in the IEEE1394 bus processing unit 10 is transmitting data using an isochronous channel in a personal line.
- the conversion unit 25 receives the information of the source device (source device) of the stream data, and the source device can be used as the destination of the command.
- the conversion unit 25 can determine the destination on the bus line of the converted command. For example, the conversion unit 25 determines a device having a sub-unit capable of executing the content pointed by the command based on information from the panel controller 13 and sends the determined device to the command destination. It can be.
- a device registered in advance in the panel controller 13 based on a user operation or the like can be set as a destination on the bus line of the command converted by the conversion unit 25.
- An appropriate destination may be set.
- FIG. 3 is a diagram illustrating a configuration example of the mobile phone terminal 5.
- the mobile phone terminal 5 of the present example includes an antenna 51, and the antenna 51 is connected to the receiving circuit 53 and the transmitting circuit 58 via the duplexer 52, and the signal received by the antenna 51 is provided.
- the receiving process in the receiving circuit 53 can be performed, and the signal subjected to the transmitting process in the transmitting circuit 58 can be wirelessly transmitted from the antenna 51.
- the receiving circuit 53 and the transmitting circuit 58 are connected to a digital signal processor (hereinafter, referred to as DSP) 54.
- the DSP 54 demodulates the received signal, and performs reception processing to extract various data such as audio data from the demodulated signal.
- a transmission process such as a process of forming data to be transmitted such as audio data into a data transmission configuration and a process of modulating the data for transmission is performed.
- the DSP 54 is connected to a speech speed 55 for speech.
- voice data When voice data is received, the received voice data is converted into an analog voice signal in the DSP 54, 'The analog audio signal is output at a speed of 55.
- it is connected to a microphone 507 for call and a DSP 504, and the audio signal output from this microphone 157 can be converted into digital audio data in DSP 54 and transmitted.
- a speaker 56 for generating a ringing tone is provided apart from the speed for calling 55.
- the communication process in the mobile phone terminal 5 is executed under the control of the control unit 59.
- the control unit 59 stores R0M59a in which data such as programs necessary for operation as a mobile phone terminal is stored, and is used for storing input data and downloaded data.
- RAM 59b is connected.
- the RAM 59b is provided with an area for storing setting data necessary for short-range communication, and stores, for example, data registered for short-range communication of the terminal. Registered for this short-range communication Details of the data will be described later.
- the mobile phone terminal 5 of this example has a configuration in which a memory card 59c can be mounted. Under the control of the control unit 59, the mounted memory card 59c can be connected to a wireless telephone line or a nearby mobile phone. Data obtained by distance wireless communication can be stored. For example, it is possible to download audio data via a wireless telephone line and store it in a memory card 59c, or to store data necessary for short-distance communication settings in a memory card 59c. It is possible.
- a display unit 61 for displaying and displaying various characters, numerals, figures, and the like is provided, and a display according to an operation state is performed under the control of the control unit 59.
- a display panel capable of color display is used as the display unit 61.
- Operation information of the operation unit 60 including a dial key and various function keys is also supplied to the control unit 59 so that the control unit 59 controls the operation according to the operation.
- the keys prepared as the operation unit 60 include, for example, a key for instructing the operation of the AV device in the case of the present example.
- a key provided in the terminal 5 such as a dial key may be assigned as a key for instructing the operation of the AV device by setting a mode or the like.
- the mobile phone terminal 5 of the present example includes a short-range wireless communication unit 62, and is capable of performing short-range wireless communication using the short-range wireless transmission method using the short-range wireless communication unit 62. .
- the short-range wireless communication section 62 is connected to an antenna 63 different from the above-described antenna 51 for wireless telephone communication, and is a short distance of up to about 100 m and conforms to the same standard. Wireless communication is directly performed with devices equipped with a short-range wireless communication unit.
- the data transmission in the short-range wireless communication section 62 is also controlled by the control section 59, and data exchange between the DSP 54 side and the short-range wireless communication section 62 is performed as necessary. Is performed. FIG.
- the transmission / reception processing unit 92 to which the antenna 91 is connected performs high-frequency signal processing to execute wireless transmission processing and wireless reception processing.
- Signals transmitted and received by the transmission / reception processing section 92 are transmitted on channels set at 1 MHz intervals in the 2.4 GHz band. However, the signal of each channel is configured to perform a process called frequency hobbing that changes the transmission frequency at a slot interval described later. If frequency hopping is performed for each slot, the frequency is switched 160 times per second because one slot is 6 25 seconds, and interference with other wireless communications occurs. Is prevented.
- a modulation scheme called GFSK Gaussian filtered FSK is applied as a modulation scheme of the radio transmission signal.
- the modulation method is a frequency shift keying method in which the frequency transfer characteristic is band-limited by a low-pass filter having a gas distribution.
- the signal received by the transmission / reception processing unit 92 and the signal to be transmitted by the transmission / reception processing unit 92 are subjected to baseband processing by the data processing unit 93.
- a TDD (Time Division Duplex) method for basically performing transmission and reception alternately is applied, and the data processing unit 93 alternately performs processing of the transmission slot and processing of the reception slot. Processing is performed.
- a function processing block 80 is connected to the data processing section 93 via an interface section 94 to supply the received data to the function processing block 80 or to receive the data from the function processing block 80.
- the transmitted data is processed by the data processor 93 as a transmission slot. Processing for transmission in the transmission / reception processing section 92, the data processing section 93, and the interface section 94 is executed under the control of the controller 95.
- This controller 95 is built in each device, for example. Central control unit 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 92, the data processing unit 93, and the interface unit 94 become a short-range wireless communication unit 90 that performs communication via Bluetooth.
- the interface unit is shown as a separate circuit from the wireless communication unit.
- the function processing block 80 connected to the short-range wireless communication section 90 corresponds to a section that actually executes a function as a device.
- the monitor receiver 1 the part that displays images and processes data transfer between a wireless network and a network connected by an IEEE 394 system bus line is used. Equivalent to.
- data transmitted by the short-range wireless communication unit is executed based on a command by a key operation or a command received via the phone line by executing a process of communicating via a wireless phone line.
- the short-range wireless communication unit 9Q is built in a device separate from the device itself and connected externally, in addition to being built into devices such as the monitor receiver 1 and the mobile phone terminal 5. You may make it do.
- FIG. 5 is a diagram showing a cycle structure of data transmission of devices connected according to IEEE1394.
- IEEE 1394 data is divided into packets and transmitted on a time-division basis with a cycle of 125 S in length.
- This cycle uses the cycle master function. It is generated by the cycle start signal supplied from the node (the device connected to the bus is also called a node in the IEEE1394 standard).
- the isochronous bucket secures a band (a time unit but called a band) necessary for transmission from the beginning of every cycle. For this reason, the transmission within a certain time is guaranteed in the isochronous transmission. However, the confirmation (acknowledgement: ACK) signal from the receiving side is not transmitted, and if a transmission error occurs, there is no protection mechanism and data is lost.
- ACK acknowledgement
- the node that has secured the bus transmits a synchronous packet that sends out an asynchronous packet. By using, reliable transmission is guaranteed, but the timing of transmission is not fixed.
- stream data such as video data and audio data is transmitted.
- asynchronous transmission for example, transmission of a control command or the like is performed.
- the node In order for a given node to perform isochronous eggplant transmission, the node must support the isochronous function. At least one of the nodes supporting the isochronous function must have the cycle master function. In addition, at least one of the nodes connected to the IEEE1394 serial bus must have the function of an isochronous resource manager.
- the node connected to the IEEE 1394 serial bus has a PCR (Plug Control Register) specified by IEC 1883 at a predetermined address of the register provided in the data input / output unit. Is configured virtually. This is logically analog In order to form a signal path similar to an interface fuse, the concept of a plug is materialized. PCR stands for output plug
- the PCR has a register oMPR (output Master Plug Register) and iMPR (input Master Plug Register) indicating information of an output plug or an input plug unique to each device.
- Each device does not have multiple oMPRs and multiple iMPRs, but can have multiple 0PCRs and iPCRs corresponding to individual plugs depending on the capabilities of the device.
- the flow of isochronous data is controlled by manipulating the registers corresponding to these plugs.
- FIG. 6 is a diagram showing the relationship between a plug, a plug control register, and an iso-open nasal channel.
- devices connected to the IEEE1394 bus are shown as AV devices a, b, and c.
- the isochronous data whose channel is specified by the oPCR [1] is IEEE 1 3 9 4 Sent to channel # 1 of serial bus.
- the input channel # 1 depends on the transmission speed and iPCR [0].
- Device a reads the isochronous data sent to channel # 1 of the IEEE 1394 serial bus.
- AV device b sends isochronous eggplant data to channel # 2 specified by 0PCR [0]
- AV device a sends channel # 2 specified by iPRC [1].
- the command and the response to the command are transmitted on the bus line.
- the controlling side is the controller
- the controlled side is the evening get.
- the transmission or response of the command is performed between the nodes using the IEEE 1394 asynchronous transaction light transaction.
- the target that received the overnight returns an acknowledgment (ACK) to the controller to confirm receipt.
- ACK acknowledgment
- FIG. 8 is a diagram for explaining the relationship between the command and the response shown in FIG. 7 in more detail.
- Nodes A and B are connected via the IEEE 1394 node.
- Node A is the controller and node B is the target.
- command registers 71 and 73 and response registers 72 and 74 are provided for each 512 bytes.
- the controller transmits a command by writing a command message to the command register 73 of the target.
- the target transmits a response by writing a response message to the response register 72 of the controller.
- Control information is exchanged for the above two messages.
- the type of command set transmitted by FCP is described in CTS in the data field of FIG. 9 described later.
- FIG. 9 shows the data structure of a packet transmitted in the asynchronous transfer mode of the AV / C command.
- AVZ C Command Dose
- AV / C command frames and response frames are exchanged between nodes.
- the response to the command is to be performed within 100 ms so as not to burden the bus and AV equipment.
- the upper part of the figure shows the header part of the bucket, and the lower part of the figure shows the data tab.
- the destination ID indicates the destination.
- the C type / response field indicates the function classification of the command when the bucket is a command, and indicates the processing result of the command when the bucket is a response.
- Commands can be broadly divided into (1) commands for controlling functions from outside (CONT ROL), (2) commands for inquiring status from outside (STA TUS), and (3) control commands. Commands to inquire whether or not there is support for GENERAL IN QU RY (with or without support for opcodes) and SPECIFICI NQU IRY (with or without support for opercodes), (4) ) Four types of commands (NOTIFY) that require notification of status changes to the outside world are defined.
- the response is returned according to the type of command.
- the response to the control (CONTOL L) command includes “Not implemented” (NOTI MP L EMENT ED), “Accept” (ACCEPTED), “Rejection” (RE JEC TED), and And “provisional” (INTERIM).
- the response to the status (S TAT US) command indicates “not implemented” (NO TIMP L EMENT ED) ⁇ There are “REJECTED”, “Migrating” (INT RAN SITI ON), and “Stable” (S TABLE).
- the response to commands (GE NE RA LINQUI RY and SPECIFICI NQU I RY) for inquiring externally whether the command is supported is “implemented” (IMP L EME NT ED), and
- the subnet type is provided to specify the function in the device, and for example, is assigned to a tape recorder / player, a tuner, and the like. In addition to the functions corresponding to the device, this subunit type also has an assignment for a BBS (Pretemporary Subunit) that is a unit that publishes information to other devices. In order to determine when there are multiple subnets of the same type, addressing is performed using the subnet ID as the determination number. An operation code, an operation code, represents a command, and an operand represents a command parameter. Fields that are added as needed are also provided. After the operand, zero data and the like are added as necessary. The data C RC (Cyclic Reduncy Check) is used for the error during data transmission.
- FIG. 10 shows a specific example of the AVZC command.
- FIG. 10A 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 00 00" indicates the control (CONTROL) and "0 0 0 "1” indicates status (S TATUS),
- "0101” indicates specific inquiry (SPECIFICI NQU I RY),
- "001" indicates NOT TIFY, and
- “0 “100” is assigned a general inquiry (GENE LI NQU I RY), and “0101 through 0111” are reserved and reserved for future specifications.
- "100” is not implemented (NOTINPL EMENT ED), "1001” is accepted (ACCEPTED), and "1001” is rejected (REJECTED).
- 0 1 1 is in transition (IN TRAN SITION),” 1 1 0 0 "has implementation (I MP LEMENTE D / S
- FIG. 10B shows a specific example of the subnet type. "0 0 0 0 0" is a video monitor, "0 0 0 1 1” is a disc recorder
- FIG. 10C shows a specific example of the operation code.
- the opcodes when the subunit type is a tape recorder / player are shown.
- Operands are defined for each operation code.
- "00h” is a manufacturer-specific value
- "5Oh” is search mode '
- "51h” is time code
- "52h” is timecode.
- Figure 11 shows a specific example of the AVZC command and the response.
- ct y p e command type includes commands to control the equipment from outside.
- the opcode is "C3h” which means playback (see Fig. 10C).
- the operand is "75h", which means forward (FORWARD).
- FIG. 12 is a diagram showing a protocol protocol required for performing wireless communication over Bluetooth.
- the protocol of the entire Bluetooth system consists of the core protocol, which is a major part of the bluetooth protocol, the application software that manages the application services, and the protocol between the core protocol and the application. Then, it is divided into three groups of conforming protocols for matching communication protocols.
- the protocol of the bunore 3 is composed of five protocols. It consists of a physical layer, baseband layer, real 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, TCP PZIP protocol and serial port emulation.
- RFC OMM protocol drivers for devices operated by the user (HID: Interface Device).
- HID Interface Device
- a protocol is prepared that conforms to the protocol file corresponding to this group of conforming protocols.
- the protocol configuration required to transmit 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 the transmission power can be reduced to a minimum of 30 dBm by control from the link layer.
- the baseband layer is defined as a protocol that interfaces the actual transmission and reception data packets to the physical layer. 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, the baseband layer manages the retransmission of the bucket and the processing of error correction and detection.
- the link management layer is one of the protocols for interfacing transmission / reception packets on a communication link.
- the link management layer sets a communication link for the base layer and various communication parameters related to the link. Specify overnight settings. These are defined in the link management layer as control buckets, and communicate with the link management layer of the opposite terminal as needed. This layer is 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.
- the voice data here is mainly voice data for making a telephone call, and is relatively low order to minimize data transmission delay when communicating with a wireless telephone.
- the logical link management layer manages the logical channels with a protocol that interfaces with the link management layer and the baseband layer. Transmission data other than the audio data handled by the audio layer is provided to the ethical link layer from the upper application, but the actual data exchanged there is the data transmitted and received by the baseband layer. The size of the overnight packet is passed without being aware of the timing. 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. 13 shows the processing at each layer when wireless communication is performed between two devices.
- the physical layer establishes a link to a physical wireless communication line, and the baseband layer With that configured link Then, transmission and reception of packets are performed.
- the link management layer control packets are transmitted and received on the communication link management channel.
- the logical link management layer packets of user data are transmitted and received on the logical channel. This user data corresponds to the stream data and commands that you actually want to transmit.
- FIG. 14 is a diagram showing the frequencies used in this method. As shown in FIG. 14, there are 79 communication frequencies at 1 MHz intervals from 2402 MHz to 2480 MHz. ⁇ Each transmitted packet occupies one communication spectrum of the 79 communication frequencies. And the communication spectrum used randomly changes (hops) every 6 25 seconds.
- FIG. 15 shows an example in which the communication frequency hops, at a specific timing t.
- the transmission frequency changes randomly every 6 to 25 seconds.
- the communication frequency changes every 625 seconds, resulting in random hopping of about 1,600 times per second.As a result, the data is spread and transmitted within the band shown in Fig. 14. This means that spectrum diffusion is taking place.
- one unit of packet is 6 2 5
- this one unit bucket continuously and transmit it.
- Figure 18 shows the communication status between two devices.
- one device that performs wireless transmission is used as the master and the other device is used as the slave
- one slot from the master to the slave
- the data of the slot configuration is transmitted during the period of (6 25 ⁇ s) (Fig. 18 ⁇ )
- the data of the slot configuration is transmitted from the slave to the master during the next one slot ( (Fig. 18 ⁇ ).
- the alternate transmission is repeated as long as the transmission continues.
- the frequency for wireless transmission is changed to frequency f (k), f (k-l-1), f (k + 2)... For each slot as described above.
- FIG. 19 is a diagram illustrating an example of a network configuration including a plurality of devices.
- the communication system standardized as a bluetooth allows not only one-to-one wireless transmission but also a large number of devices to form a network. That is, when wireless transmission is performed between two devices, as shown in FIG. 19A, one device becomes a master and the other device becomes a slave. Two-way radio transmission is performed between ll and slave SL11.
- a network may be prepared by preparing L 23 and performing wireless transmission between these four devices.
- a network composed of one master and a slave that directly communicates with the master is called a piconet.
- a network group having a plurality of masters that is, a network group composed of a plurality of piconets
- CAS network A network group having a plurality of masters (that is, a network group composed of a plurality of piconets) is referred to as a CAS network.
- the SC0 link is a connection type for performing one-to-one communication between a master and a specific slave, and is a so-called circuit-switched link.
- This link is mainly used for applications that require real-time properties such as voice.
- This SCO link secures a communication slot in advance at a fixed interval in the communication link within the piconet, and if there is other data transmission in the middle, the data communication of the SC0 link has priority. Is done. That is, as shown in FIG. 20, for example, the SCO communication slot is mutually transmitted between the master and the slave at regular intervals.
- FIG. 2OA shows transmission from the master
- FIG. 20B shows transmission from the slave.
- This SCO link can support up to three SCO links for one master at the same time. In this case, there are a case where one slave subscribes to three SCO links and a case where three different slaves subscribe to one SCO link. Note that the SC0 link does not have a retransmission function.
- the ACL link is a so-called packet exchange connection type.
- One-to-many communication is possible between the master and multiple 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 amount of data and 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 multiple applications on one slave, it is necessary to multiplex the higher-level applications by protocol. Unless otherwise specified, single-slot ACL packets are used for communication between the master and the slave. In order for a slave to transmit a multislot ACL bucket, it is necessary to have permission from the master beforehand. The master can reject a multislot ACL packet 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 bucket.
- whether the ACL packet sent from the master is a single slot or a multi-slot depends on the decision of the master and the slave, so the slave always prepares to receive all the multi-slot packets. There is a need.
- the ACL No. 0 packet provides the following three bucket communication methods separately from the definition of single slot and multi slot.
- the first is an asynchronous communication system (Asynchronous transfer)
- the second is an isochronous communication system (Isochronous transfer)
- the third is a broadcast communication system (Broadcast transfer).
- the asynchronous communication method is a communication method for transmitting and receiving a normal bucket. The data transmission speed changes depending on the amount of traffic of the slave existing in the piconet divided by the bucket retransmission due to the deterioration of the communication line quality.
- Figure 21 shows three slaves (slave 1, slave 1) in the same piconet.
- FIG. 21A shows transmission from the master
- FIG. 21B, FIG. 21C, and FIG. 21D show transmission from slaves 1, 2, and 3, respectively.
- the ACL packet is transmitted from the master to each of the slaves 1, 2, and 3 in order, and as shown in Fig. 21B, Fig. 21C, and Fig. 21D.
- the slave that received the ACL bucket has returned a receipt confirmation packet to the master.
- 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 packet so that continuity of the stream data can be ensured on the receiving side. I do.
- the isochronous eggplant communication method In the isochronous eggplant communication method, 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. In the case of the isochronous communication method, the slot interval must be agreed between the master and the slave before starting communication in the isochronous communication method as the maximum polling time.
- the master can forcibly specify the maximum polling interval for the slave, and can reject a request for setting the isochronous communication system from the slave.
- the maximum polling interval cannot be specified for the master from the slave.
- the eggplant communication setting request cannot be made.
- FIG. 22 shows an example in which communication is performed between a master and a slave using the isochronous communication method.
- FIG. 22A shows transmission from the master
- FIG. 22B shows transmission from the slave.
- the ACL packet is transmitted to the slave from the master and the slave receiving the ACL packet immediately confirms the receipt of the packet. Return to the master.
- the broadcast method is set by setting the slave identifier in the bucket header to zero. As a result, a broadcast packet can be transmitted from the master to all slaves. A 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. 23 shows an example in which all slaves in the piconet are communicated using the broadcast method.
- FIG. 23A shows the transmission timing from the master
- FIGS. 23B, 23C, and 23D show the reception status at slaves 1, 2, and 3, respectively.
- the portion with the X mark shows an example when the packet at the slave cannot be received at that time, and is repeated N BC times. The transmission ensures that all slaves can be broadcast.
- FIG. 24 is a diagram illustrating a communication example in which the SC0 link and the ACL link are used in combination.
- Figure 24A shows the transmission timing from the master
- Figure 24B, Figure 24C, and Figure 24D show the reception and transmission states at slaves 1, 2, and 3, respectively.
- the master sends ACL packets to the three slaves 1, 2, and 3 as needed. Have been.
- the broadcast bucket is 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 setting parameters required for the iso-mouth communication system and the broadcast communication system.
- the frequency hopping pattern and the like are set using the internal clock of each device.
- the clock possessed by the master and slave is set, for example, by 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, which is the minimum time unit for processing calls and inquiries.
- the 28-bit counter which counts and stops one by one every 32.5 seconds, increases the randomness of the frequency hobbing pattern by one cycle of about 23 hours. ing.
- the period of 32.5 seconds 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 ⁇ s set by the clock value of the first bit is the time period of the slot where the communication frequency changes.
- the 1.25 msec cycle set by the second bit clock value is the transmission / reception time cycle of the master or slave.
- the 1.28 second period set by the clock value of the 12th bit is the clock timing of the time period that changes the reception frequency in queries and calls.
- Each slave refers to the master's clock, adds a certain offset value to its own clock so that it matches the master's clock, and uses the added clock 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 burst.
- Fig. 26 is a diagram showing an example of this 48-bit address configuration.
- the lower 2 and 4 bits are LAP (Lower Address Part),? The missing 8-bit UAP (Upper Address Part) and the rest
- NAP Non-significant Address Part
- a frequency hopping pattern based on the address of the master is given to each piconet.
- the slave is notified of the address of the master station.
- Each slave can independently calculate the same frequency hopping pattern as the master.
- FIG. 27 is a diagram illustrating a configuration example of calculating a communication frequency.
- the lower 28 bits of the address of the mask and the lower 27 bits of the 28-bit block are supplied to the communication frequency selection section 8, and the communication frequency which is the channel frequency hobbing pattern is supplied. Is uniquely determined. However, the ringing frequency hopping pattern and the query frequency hopping pattern are different from the channel frequency hopping turn.
- Figure 28 shows the packet format.
- a packet is roughly divided into three parts: an access code, a packet header, and a payload.
- the payload is set to a variable length according to the amount of data transmitted at that time.
- FIG. 29 is a diagram showing the 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 transmitted and received buckets. Depending on the type of bucket, there may be only this access code.
- the preamble is composed of a fixed 4-bit length that repeats a pattern of 1 and 0 according to the LSB of the sync signal.
- the trailer consists of 4 bits that repeat 1 and 0 according to the MSB of the sink. Both functions function to remove the signal DC component of the entire access code.
- the 48-bit sync word is 64 bits of data generated based on a 24 bit LAP of the 48 bit address. This sync word is used for piconet identification. However, a bucket used for inquiries and calls for communication when the master address or clock cannot be obtained. In some cases, a different sink code is used.
- FIG. 30 is a diagram showing a configuration of a bucket header.
- the bucket header is a section that contains the parameters required to control the communication link in the baseband layer.
- the 3-bit AMADDR is an identification field for identifying the slave that is communicating in the piconet, and is the value assigned by the master to each slave.
- the 4-bit TYPE is a packet type type field that specifies what the bucket is like as a whole.
- 1-bit FL0W is a field used for managing the mouth control of a bucket communicating with an ACL link.
- 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 sent to the source of the packet using the ARQN field. Based on whether the value of this field is 1 or 0, it notifies the other party that the received packet did not contain an error or that there was 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 payload.
- the 1-bit SENQ is a field used to manage retransmission packets so that they do not overlap on the receiving side. When retransmitting the same packet, the value is set to 1 for each packet transmitted. Invert alternately with 0.
- CAC 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 bucket exchange type ACL link.
- FIG. 31 shows the structure of the pay mouth of the ACL link. . It is composed of three parts: a payload header, a payload body, and an error detection code, and the overall length of the payload is variable.
- the SC0 link payload since the SC0 link payload has a communication slot periodically reserved in advance, there is no retransmission of data packets overnight, and it has only a pay mouth per body and the payload is a payload header. And the error detection code are not added.
- the payload header is a part that contains the parameters necessary to control the data in the higher layer than the base layer, and is the data included only in the ACL link.
- 3 2 shows the configuration of a singles opening Tsu Tobaketsu Bok of payload Dohedda, 3 3, showing the structure of a multi-slot Nono 0 Kek Bok Pay port one Dohedda.
- the 2-bit L-CH data included in the pay-ahead header is a field that identifies the logical channel that specifies what kind of data is in the layer above the baseband layer.
- the SC0 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. For three user logical channels, LCH is defined 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 5-bit or 9-bit LENGTH is a field that indicates the data length of the payload body in bytes. For a single-slot bucket, it is 5 bits, and for a multi-slot bucket, it is a 9-bit field.
- UNDEFINED is present only in multi-slot, zero- ket payload headers, is currently an undefined field, and is set to all zeros.
- the payload body contains data of the length specified by LENGTH in the pay header.
- the pay mouth of the data packet is composed of only the pay mouth body.
- 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 pay-ahead header and the payload.
- the initial value set in the 16-bit shift register is the 16-bit UAP of the already described address plus the 8-bit zero plus the 8-bit zero. Set the value.
- the address used here is the same as the address used when generating the access code, as in HEC.
- the TYPE field specifies the packet type.
- a common bucket commonly used by the SC link and the ACL link and a packet core unique to the SC0 link or the ACL link.
- the common bucket contains NU LL packet, P ⁇ LL packet, FHS packet, DM1 packet, IQ packet, 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) O flow control (FLOW). No acknowledgment of the packet is required for receipt of this NULL bucket.
- the P0LL packet is a packet composed of an access code and a bucket header, has a fixed length of 126 bits, and manages the state of the communication link.
- the P 0 LL bucket unlike the NULL bucket, it is necessary to send a response to the confirmation of the bucket in response to the reception of the POLL packet even if there is no data to be transmitted. .
- the FHS packet is an important control packet for synchronizing within the piconet, and is essential for establishing synchronization between the smartphone and slave, and is transmitted when parameters such as clock and address are exchanged. Be trusted.
- Figure 34 is a diagram showing an example of the configuration of the payload of the FHS bucket.
- the payload of the FHS packet consists of a field strength of 11 and a 1 for the 144 bits of this 11 field.
- the 34-bit parity bit is used for the sync word in the access code set in the FHS bucket. It is a finale that includes the quality.
- the 24 bit LAP is the lower 24 bits of the address of the terminal transmitting the FHS packet. 2 bits following LAP are undefined Field and set to 0.
- the 2-bit SR indicates the number of repetitions when the master transmits the ID packet sequence to the slave in the call, and the scan cycle when the slave scans the ID packet sequence from the master. This is a 2-bit field that specifies the period.
- the 2-bit SP is a field that 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 query. .
- the 8-bit UAP is the upper 8 bits of the address of the terminal transmitting the FHS packet.
- the 1- to 6-bit NAP is 16 bits other than the LAP and the UAP in the address of the terminal transmitting the FHS packet.
- the 24-bit device class is a field that indicates the type of terminal.
- the 3-bit AMADDR is a 3-bit field for the master to identify the slave.
- the slave identifier used in the piconet is specified in the FHS packet transmitted by the master to the slave.
- the FHS packet that the slave sends in response to the IQ packet from the master 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 provided by the terminal. This clock has a clock precision of 1.25 seconds. When transmitting an FHS bucket, the clock value at that time must be set.
- the 3-bit page scan mode is a field that specifies the mode of the default call scan supported by the terminal that transmitted the FHS bucket.
- the DM 1 bucket When transmitting and receiving over the DM0 bucket power SC0 link, it always functions as a control packet. On the other hand, when data is transmitted / received by the ACL link, it is used not only to function as a control packet but also to transmit / receive a data packet.
- the IQ bucket is a bucket that is broadcast by the master in an inquiry, and consists of only an inquiry access code.o
- the ID bucket is a bucket that the master designates and sends to a specific slave in a call, and consists only of a call access code.
- the IQ bucket and the ID bucket are buckets that are not defined in the type field of the bucket header.
- an SC0 packet which is a data bucket transmitted and received on the SC0 link will be described.
- the SC0 packet is an HVI packet, an HV2 packet. It consists of four types: packets, HV3 packets, and DV packets.
- the pay mouth of the HV 1 packet is composed of only the payload body, and contains 10 node user data. SC ⁇ Since packets are not basically retransmitted, no error detection code is included in these 10 bits. Then, the data is error-correction-coded at a rate of 1 Z 3, and finally has a payout length of 240 bits.
- Bae Lee opening one de of HV 2 Nono 0 Kek Bok also consists of only Bae Lee opening one Dobodi, there data 2 0 carbonochloridate I Bok is housed Oyobi to. These 20 bytes do not include the error detection code. Then, the data is subjected to a 2/3 rate error correction code, and finally has a payout length of 240 bits.
- the payload of the HV3 bucket is also composed of only a pay-per-body, which contains 30 kbytes of data. This 30 knot does not include the error detection code. The 30 bytes are not subjected to error detection coding.
- a DV packet is composed of a fixed-length 10-byte voice portion and a variable-length data portion up to a maximum of 9 bytes.
- the error correction code is not included in the 1Q byte of the voice part, but the error correction code of two bytes is added to the data part of the maximum 10 bytes that is obtained by expanding the payload header of 1 byte. Is done.
- the ACL bucket Bok sent and received on the AC L 'link, DM 1 path Kek door, DH 1 Nono 0 Kek, DM 3 packets, DH 3 Bruno,. Ket, D
- the payload of one DM bucket consists of a 1-byte payload header, a payload body of variable length up to 17 bytes, and an error detection code.
- D H 1 The structure of the packet is the same as that of D M1. However, the payload is not error correction coded. Therefore, variable length data of up to 27 bytes can be transmitted and received.
- DM 3-bucket payload is 2-byte payload header 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.
- the configuration of the DH3 packet is the same as the configuration of the DM3 packet.
- the payload is not error correction coded. Therefore, at most
- the payload of the DM5 bucket consists of a 2-byte payload header, a variable-length pay-port single-body body of up to 224 bytes, and a 2-byte error correction code.
- the structure of the DM5 bucket is the same as that of the DM5 bucket.
- the payload is not error correction encoded. Therefore, it is possible to transmit and receive variable-length data up to 339 kbytes.
- the AUX bucket is DH1 when the two-byte error detection code is not included. Same as Ket. That is, there is no retransmission of AUX1 packets.
- 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 is composed of a three-step fuse related to communication and a low power consumption mode related to terminal power consumption. Get involved in communication
- the three phases are divided into a standby phase, a synchronization establishment phase, and a communication phase.
- Figure 35 shows an example of state transition, where 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 the master and the slave.
- the synchronization establishment phase consists of two types: inquiry (S12) and call (S13).
- An inquiry is a processing state of the first stage performed to establish synchronization within the piconet.
- 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 direct calling o
- the master in this processing state continuously broadcasts the IQ bucket regardless of whether or not there are slaves in the vicinity. If there is a slave in the inquiry processing state around the slave, the slave sends an FHSS bucket to the master every time an IQ packet is received to convey the attribute.
- the F ⁇ S bucket allows the master to know the slave's address and clock.
- FIG. 36 is a diagram showing processing performed by the master and the slave in the inquiry state.
- the central master IQ bucket is transmitted, as shown in Fig. 36 ⁇ , the surrounding slaves transmit the FHS bucket to the master. In this way, the master in the inquiry sends F
- the HS bucket will be received.
- the problem here is that multiple slaves transmit FHS packets for a particular IQ packet at the same time. Multiple FHs at the same time When an s packet is transmitted, a collision of buckets occurs and a mask is transmitted, making it impossible to determine the FHS packet. In blue tooth, to avoid such collisions, a random time back-off is performed when transmitting an FHS bucket. In other words, the slave does not transmit an FHS packet to the IQ packet received for the first time in the evening, and then suspends the reception of the IQ packet during the random time back-off. The slave then resumes receiving IQ packets and then sends an FHS bucket to the master immediately after receiving the IQ packet. When the slave receives the FHS packet, it interrupts the IQ packet reception while it is backing off for a random time. Thereafter, this operation is repeated.
- FIG. 37 shows an overview of the processing at the master and slave in this inquiry.
- FIG. 37A shows transmission and reception at the master
- FIG. 37B shows transmission and reception at the slave. Since the master does not notify the slave that the FHS packet was successfully received, the slave in the inquiry state will return to the state where the FHS packet was 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. Eventually, by continuing to make inquiries for a certain period of time, the reliability of FHS bucket transmission / reception is improved.
- the roles of the master and the slave are different.
- the master selects the slave to communicate with based on the information of the FHS bucket sent and received by the inquiry, and sends the ID bucket to the slave.
- the master confirms receipt of the ID bucket, it sends an FHS packet to the slave. This allows the slave to take over the master's address and clock. You can know.
- a call access code is used as the access code of the ID bucket and the FHS bucket transmitted and received here.
- Figure 38 outlines the processing performed by the master and slave in the call. As shown in Figure 38A, the master in the center
- the slave By sending the ID packet to the slave, the slave notifies the reception confirmation. Also, as shown in FIG. 38B, the master sends an FHS packet to the slave, so that the slave notifies the reception confirmation.
- a call exchanges processing between a specific slave and the master. Since buckets can be transmitted and received one-to-one, the master and slave can perform processing while confirming the transmission and reception.
- the slave that has received the ID packet from the master sends the same ID packet to the master and notifies the master of the acknowledgment.
- the master sends an FHS bucket 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 39 is a diagram showing an example of processing between a master and a slave in a call.
- Fig. 39A shows the transmission / reception timing at the master
- Fig. 39B shows the transmission / reception timing at the slave.
- This communication connection phase is a phase in which the master and the slave synchronize within the piconet through the synchronization establishment phase, and actual communication can be performed. You. In the connected state, no data bucket is sent or received. At this time, transmission and reception are limited to control packets for setting communication links, security-related control packets, and control buckets related to the low power consumption mode.
- Transmission and reception of data packets in data transfer are performed according to the rules of master and slave and time slot. Also, if the terminal due to data transfer disconnects communication, or if there is a hard reset to the controller in the terminal, the terminal will be in standby state from data transfer. Transition.
- Low power consumption mode is a mode that provides a low power consumption state for terminals that transition from the connection. There are three types of low power consumption modes: park mode (S16), hold mode (S17), and sniff mode (S18).
- the park mode is a mode specific to the slave, and is a low power consumption mode that maintains synchronization within the piconet established by the connection.
- the hold mode is a low power consumption mode in which both the smartphone and the slave can shift, maintains the synchronization within the piconet established by the connection, and in the case of a slave, identifies the thread given by the master. This is the mode that holds the child.
- the sniff mode is a low power consumption mode unique to the slave. As in the hold mode, the slave keeps the synchronization within the piconet established by the connection and the slave identification given by the master. This is the mode that holds the offspring.
- master-slave conversion can be performed between a master and a specific slave within a piconet.
- processes related to security executed in the connection state of the communication connection file are roughly classified into two processes of authentication and encryption.
- the authentication process it is to judge the connection between yourself and a specific partner.
- Encryption refers to protecting the data being transmitted from being intercepted by a third party.
- a link key is a parameter that controls one-to-one security between two specific terminals. This link key must not be disclosed to third parties.
- the initialization key used between the terminals that try to connect for the first time is used, and if the connection was made in the past and the link key was set as a parameter in the database, Uses the set link key.
- the initialization key is generated using a PIN code from a higher-level abridgement and internally generated data.
- Figure 40 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.
- a terminal that receives the command and sends a response to the source of the command is It is called a kit.
- This relationship between the controller and the target is a different concept from the master and slave already described, which is necessary for 'managing the communication connection'. Basically, each of them functions as a master / slave terminal. May be.
- AV / CTP Audio / Video Control Transport Protocol
- a protocol called AV / C command for controlling AV equipment is prepared on the protocol.
- Fig. 41 shows an example of the data structure of an L2CAP bucket for transmitting the data of the protocol.
- a header is added to the beginning of the payload section of this bucket (the part indicated as L2 CAPH eader), the data length (1 ength), and the channel length. ID and are indicated.
- the subsequent sections become the actual information (information).
- an AVTCP header and an AVTCP message are arranged.
- the data of the AVCTP message is "0000" data (4 bits) indicating AV / C data.
- Command / response data (4 bits) indicating the command type and response type, data indicating the subunit type (5 bits), data indicating the subunit ID (3 bits), and the function Operand [0], Operand [1], Operand [8] Operand [8] and Operand (8 bits) that are data accompanying the function De [n] (n is any integer).
- the data structure of AVCTP shown in Fig. 34 is based on a network connected by a wired bus line.
- the data structure specified as the AV / C command set which is a standard for transmitting device control data, is applied.
- Fig. 42 is a diagram showing a state where commands and responses are wirelessly transmitted between the controller and the evening getter.
- the controller establishes a connection to the target (step S31). ), And the AV / C command is transmitted from the controller to the target in the established connection (step S32). The target receiving this command sends a response to the command to the controller (step S33). Then, if necessary, processing for the command is executed in the evening. If the command is to check the status of the target, 'Send the requested data to the controller in response.
- FIG. FIG. 44 shows the data structure of an interval transmitted as an AV / C command in 8-bit units.
- AV / C command frames and response frames are exchanged.
- Responses to commands are to be made, for example, within a specified period. However, the provisional response is for the specified period It may also be necessary to send a formal response after a certain period of time.
- CTS indicates the ID of the command set. In the AV / C command set, it is.
- the C type / response field indicates the function classification of the command when the packet is a command, and the command processing result when the packet is a response.
- the command and response types are the same as those already described for the AV / C command.
- the submit type is provided to specify the function in the device. In order to determine when there are multiple subnets of the same type, addressing is performed with the subnet ID as the identification number.
- An operation code, an operation code, represents a command, and an operand represents a command parameter. There are also fields that are added as needed. After the operand, 0 data is added as needed.
- This panel submit displays a GUI (Graphic User Interface) panel related to operations that can be performed on the controlled device on the control device side, for example, a remote control device, and responds to the display of the panel.
- GUI Graphic User Interface
- the display function on the panel specified by that key is executed. You.
- control using the panel submit control may be performed using a pass-through command.
- FIG. 45 is a diagram showing the configuration of a pass-through (PASSTHR0UGH) command transmitted to the panel subunit.
- the section of the operation code is a code indicating that it is a pass-through command (7 C ⁇ 6
- various operations are assigned to each code value. For example, a code that instructs the direction and selection of an up / down on the GUI screen, a code that instructs the selection of the menu screen, audio equipment and video such as play, stop, record, fast forward, and rewind. A code that directly instructs the operation of the device has been assigned. .
- the wireless network processing unit 20 in the monitor receiver 1 of the present embodiment will be described.
- the monitor receiver 1 and the IEEE1394 system are used as a pass-through command wirelessly transmitted from the mobile phone terminal 5 to the monitor receiver 1.
- the command is for instructing the operation (for example, reproduction) of the video cassette recording / reproducing apparatus 2 connected by the bus line.
- an AVCTP protocol command including an operation ID for instructing the playback is transmitted to the mobile phone terminal. It is transmitted wirelessly from 5 (step Sl).
- the wirelessly transmitted signal is received by the wireless network processing unit 20 of the monitor receiver 1.
- the wireless network processing unit 20 of the monitor receiver 1 wirelessly transmits a response to the command (step S2), and the mobile phone terminal 5 receives the response.
- the wireless network processing unit 20 of the monitor receiver 1 that has received the command in step S1 performs a process of determining the destination of the received command, and based on the determination, for example, a video
- the IEEE 1394 bus / wireless network conversion unit 25 in the wireless network processing unit 20 uses the AV for the IEEE 1394 bus. Perform processing to convert to / C command.
- the conversion process at this time is, for example, the AVZC command shown in FIG. 9 is used to remove the header portion data specified by the Bluetooth standard as shown in FIG. Processing to add the specified header part is performed. At this time, add the destination data on the IEEE1394 bus to the AVZC command data.o
- the converted AV / C command is sent to the IEEE 1394 bus processing unit 10 in the monitor receiver 1 and the format command of the converted AV / C command is sent from the bus line connected to the monitor receiver 1. It is sent (step S3).
- the video cassette recording / reproducing apparatus 2 starts a reproducing operation, and the response to this command is monitored via the bus line. It is returned to the receiver 1 (step S4).
- the command power wirelessly transmitted from the mobile phone terminal 5 is relayed by the monitor receiver 1 and transmitted to the video power set recording / reproducing device 2 via the bus line, whereby the video cassette is transmitted.
- the mobile phone terminal 5 can function as a remote control device of the video cassette recording / reproducing device 2. become.
- FIG. 48 is a flowchart showing an example of the device information collection processing. This device information collection processing is performed under the control of the panel controller 13 in the IEEE1394 bus processing unit 10, for example. 'It is stored in the memory etc. in the flannel controller 13.
- the panel controller 13 determines whether or not a bus reset has occurred in a wired network connected by a bus line (step S11). This bus reset occurs when there is a change in the configuration of devices connected to the bus line. When the bus reset occurs, a signal for identifying the bus reset is transmitted on the bus line. The process waits until a bus reset occurs, and when it is determined that the bus reset has occurred, a process for checking a subnet provided in each device connected to the bus is performed (step S12). In this sub-unit survey, for example, a command to inquire about the sub-unit configuration is sent from the mobile receiver 1 to each device in the wired network in sequence, and the sub-unit configuration is determined based on the response. I do.
- a process is performed to check whether each device supports the pass-through command (step S13).
- a table that is a correspondence table between the node ID of each device in the network and the subnet of the device that supports the pass-through command is created, and the data of the created table is sent to the panel controller 13. It is stored in a memory or the like (step S14). The stored data of the table is retained until the next bus reset occurs, and is updated by the processing from step S11 to step S14 at the time of bus reset.
- FIG. 49 is a flowchart showing a processing example in the monitor receiver 1.
- the panel subnet 24 of the wireless network processing unit 20 determines whether an AVCTP protocol command has been received (step S21) and waits until the command is received. I do.
- it is determined whether or not the command is a command for controlling the operation of the monitor receiver 1 (step S22).
- the determination is a command for controlling the display state by determining the content of the command
- it is determined that the command is for controlling the operation of the monitor receiver 1.
- the panel sub-unit 24 of the wireless network processing unit 20 directly controls each processing unit in the monitor receiver 1, and
- step S22 If it is determined in step S22 that the command is not a command for the monitor receiver 1, the IEEE The 1/394 bus / wireless network conversion unit 25 performs processing to convert to the AV / C command for the IEEE 1394 bus (step S).
- step S26 when it is determined from the data stored in the table stored in the panel controller 13 that there is a corresponding device, it is determined whether there is one or more corresponding devices (step S26). If it is determined that there is only one corresponding device in this determination, the conversion unit 25 performs a process of adding the node ID of the corresponding device to the command, and performs the conversion process. Is transmitted from the port section 1.1 of the IEEE 1394 bus processing section 10 to the connected bus line (step S27).
- step S28 device identification processing for identifying one device among the plurality of devices is performed (step S28), and the identification is performed.
- the conversion unit 25 adds the node ID of the converted device to the command, and the converted command is sent to the IEEE1394 bus processing unit 1.
- the data is transmitted from the port section 11 of 0 to the connected bus line (step S29).
- the devices which are currently transmitting stream data such as video data or audio data on the bus line by using the isochronous channel If there is, make the device the destination of the command.
- the video cassette recording / reproducing device 2 and the hard disk recording / reproducing device 3 If three of the tuners 4 can transmit stream data, for example, if the video cassette recording / reproducing device 2 of the tuners 4 performs a reproducing operation and transmits the reproduced video data to the bus, Set the video talent set recording / reproducing device 2 to the destination of the command.
- the device specifying process in step S28 for example, if a process of selecting a device to be controlled in advance has been performed, the previously selected device is set as a command destination. Is also good.
- the previously selected device is set as a command destination.
- the network configuration shown in Fig. 1 there are two playback devices, a video cassette recording / reproducing device 2 and a hard disk recording / reproducing device 3.
- the selected device is set as the destination when a command related to the playback operation is received.
- step S28 other processing may be performed as the device identification processing in step S28. For example, among the devices connected on the bus line, if the device goes into a hibernate state due to power off or the like, and the port connected to the bus line is in the suspend state, May be excluded from the candidate devices.
- the device that receives the command transmitted wirelessly over the Bluetooth standard wireless network converts the command for the wired bus line connected to the device and sets the command.
- the device By transmitting commands to the destination device via the bus line, if the device is connected via the IEEE 1394 bus line and supports AV / C commands, Even devices that cannot communicate wirelessly over a network can be reliably controlled based on the wireless signals of the Proto-Base standard.
- the destination of the command is determined based on the control content of the command, and the corresponding device is securely sent to the relevant device. Is transmitted to the Even if the receiving device is one specific device (the monitor receiver 1 in the above example), it is possible to control each device in the network connected by the bus line well.
- the IEEE 1394 system is applied as a network connected by a wired bus line, and bluetooth is applied as a wireless network.
- other similar wired networks are used.
- the processing of the present invention can also be applied to transmission of control commands and the like by applying a network and a wireless network.
- AV devices that handle video data and audio data were used as devices connected by a wired bus line.However, when other devices are connected to the bus line and controlled by command or other transmission, Applicable.
- a data processing device such as a personal computer device is connected to the bus line, and a software as a program for executing the function of performing the above-described command relay process is mounted on the data processing device. Then, in the arithmetic processing by executing the software, the command received wirelessly by the data processing device may be transmitted to another device on the bus line. Further, a program for performing such processing may be recorded on a recording medium and distributed to a user or the like.
- the present invention it is possible to transmit a device control command transmitted from a device on the wireless network side to a specific device in a wired network.
- Devices in the network connected by bus lines can be controlled remotely by wireless commands.
- the process of determining the device to which the command is to be delivered in the wired network is a process of searching for devices that match the content specified by the command from the devices connected to the wired network.
- it is possible to easily determine the destination of a command within a wired network for example, only by determining the content specified by the command. .
- the function of the device connected to the wired network is checked in advance, and data about the checked function is retained, so that the command is instructed. It becomes possible to easily determine the device corresponding to the content.
- the process of determining the device to which the command is to be delivered in the wired network is performed by determining the device that is the source of the stream data in the wired network by the device of the destination. With this process, it is possible to directly control devices that transmit stream data to bus lines in a wired network.
- the process of determining the device to which the command is to be delivered in the wired network from the received command is a process of determining the device that has been registered in the device in advance. Commands can be transmitted reliably.
- the command structure differs between the wired network and the wireless network. Can be dealt with.
- device control commands in wireless networks are AVCTP protocol commands
- device control commands in wired networks are IEEE 1394 AV / C commands.
- a wireless network such as a wireless network using the AVCTP protocol
- a wired network can be used.
- a network a network based on the IEEE 1394 method using AV / C commands can be used, and commands can be easily exchanged between the two networks.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002557084A JPWO2002056548A1 (ja) | 2001-01-16 | 2002-01-16 | データ伝送方法、データ伝送装置、記録媒体及びプログラム |
KR1020027012114A KR20020082882A (ko) | 2001-01-16 | 2002-01-16 | 데이터 전송 방법, 데이터 전송 장치, 기록 매체 및프로그램 |
EP02710304A EP1261174A1 (en) | 2001-01-16 | 2002-01-16 | Data transmission method, data transmitter, record medium, and program |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2001-7933 | 2001-01-16 | ||
JP2001007933 | 2001-01-16 | ||
JP2001206775 | 2001-07-06 | ||
JP2001-206775 | 2001-07-06 |
Publications (1)
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WO2002056548A1 true WO2002056548A1 (fr) | 2002-07-18 |
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PCT/JP2002/000246 WO2002056548A1 (fr) | 2001-01-16 | 2002-01-16 | Procede de transmission de donnees, emetteur de donnees, support d'enregistrement et programme |
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US (1) | US20030188028A1 (ja) |
EP (1) | EP1261174A1 (ja) |
JP (1) | JPWO2002056548A1 (ja) |
KR (1) | KR20020082882A (ja) |
WO (1) | WO2002056548A1 (ja) |
Cited By (1)
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WO2013145655A1 (ja) * | 2012-03-26 | 2013-10-03 | パナソニック株式会社 | リモコン制御システム |
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EP1328134A4 (en) * | 2000-10-25 | 2009-06-17 | Panasonic Corp | CONTROLLED DEVICE IN A NET APPARATUS, CONTROL DEVICE AND ITS CONTROL PROCESS |
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KR100611173B1 (ko) * | 2004-06-04 | 2006-08-10 | 삼성전자주식회사 | 셋탑박스를 이용한 영상시스템에서 제어데이터의 전송방법 |
KR100792281B1 (ko) * | 2005-12-16 | 2008-01-07 | 삼성전자주식회사 | 네트워크 id 충돌 탐지 및 충돌 해결방법 |
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EP1826679B1 (en) * | 2005-12-30 | 2013-06-26 | Psion Inc. | Bluetooth communication through a single virtual port |
CA2531896C (en) * | 2005-12-30 | 2010-03-23 | Psion Teklogix Inc. | Bluetooth communication through a single virtual port |
JP4326557B2 (ja) * | 2006-11-08 | 2009-09-09 | フェリカネットワークス株式会社 | 無線通信システム、情報通信端末、携帯電話、リーダライタ、通信方法およびコンピュータプログラム |
US7995687B2 (en) * | 2007-03-05 | 2011-08-09 | Broadcom Corporation | Fast and reliable channel classification algorithms in bluetooth networks to detect and avoid 2.4 GHz interferers |
CN101388678B (zh) * | 2007-09-10 | 2013-02-06 | 北京三星通信技术研究有限公司 | 无线麦克风信标系统中保护设备的初始化方法及保护设备 |
US9235681B2 (en) * | 2011-10-04 | 2016-01-12 | Smith & Nephew, Inc. | System and method for intersystem device exchange |
AU2013334438B2 (en) * | 2012-10-26 | 2018-06-14 | Absolute Software Corporation | Device monitoring using multiple servers optimized for different types of communications |
CN105094900A (zh) * | 2015-07-13 | 2015-11-25 | 小米科技有限责任公司 | 一种下载控制程序的方法及装置 |
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CN107517069B (zh) * | 2017-08-22 | 2020-06-02 | 深圳市华信天线技术有限公司 | 跳频同步的方法、装置、接收机以及发射机 |
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- 2002-01-16 WO PCT/JP2002/000246 patent/WO2002056548A1/ja not_active Application Discontinuation
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- 2002-01-16 EP EP02710304A patent/EP1261174A1/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
KR20020082882A (ko) | 2002-10-31 |
JPWO2002056548A1 (ja) | 2004-05-20 |
EP1261174A1 (en) | 2002-11-27 |
US20030188028A1 (en) | 2003-10-02 |
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