WO2016153279A1 - Procédé et dispositif de recherche de dispositif dans un réseau maillé utilisant le bluetooth - Google Patents

Procédé et dispositif de recherche de dispositif dans un réseau maillé utilisant le bluetooth Download PDF

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Publication number
WO2016153279A1
WO2016153279A1 PCT/KR2016/002949 KR2016002949W WO2016153279A1 WO 2016153279 A1 WO2016153279 A1 WO 2016153279A1 KR 2016002949 W KR2016002949 W KR 2016002949W WO 2016153279 A1 WO2016153279 A1 WO 2016153279A1
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information
mesh network
bluetooth
message
network
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PCT/KR2016/002949
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English (en)
Korean (ko)
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최진구
권영환
임진권
이현재
이민수
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엘지전자(주)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Definitions

  • the present invention relates to a method and apparatus for discovering a device in a mesh network using Bluetooth, which is a near field technology, in a wireless communication system. will be.
  • Bluetooth is a short-range wireless technology standard that can transmit and receive data by wirelessly connecting various devices in a short distance.
  • a user When performing wireless communication between two devices using Bluetooth communication, a user performs a procedure of searching for a Bluetooth device and requesting a connection. do.
  • the device may mean an apparatus and an apparatus.
  • the user may perform a connection after searching for the Bluetooth device according to the Bluetooth communication method to use using the Bluetooth device.
  • the Bluetooth communication method includes a basic rate / enhanced data rate (BR / EDR) method and a low energy (LE) method, which is a low power method.
  • the BR / EDR scheme may be referred to as Bluetooth Classic.
  • the Bluetooth classic includes Bluetooth technology that has been adopted since Bluetooth 1.0 using Basic Rate and Bluetooth technology that has used Enhanced Data Rate supported since Bluetooth 2.0.
  • Bluetooth Low Energy (hereinafter referred to as Bluetooth LE) technology has been applied since Bluetooth 4.0, and can consume hundreds of kilobytes (KB) of information stably with low power consumption.
  • the Bluetooth low energy energy technology uses an attribute protocol to exchange information between devices. This Bluetooth LE method can reduce energy overhead by reducing the header overhead and simplifying the operation.
  • Bluetooth can achieve a relatively high speed at a relatively low power, low cost, but the transmission distance is generally limited to a maximum of 100m, it is suitable for use in a limited space.
  • LE Bluetooth Low Energy
  • Another object of the present invention is to provide a method for discovering a device outside a device search range in a Bluetooth mesh network.
  • Another object of the present invention is to provide a method for discovering a device forming a mesh network by receiving device information from a Bluetooth mesh network.
  • Another object of the present invention is to provide a method for discovering a device outside a device search range forming a mesh network by receiving device information from another device in a Bluetooth mesh network.
  • Another object of the present invention is to provide a method for searching before or after connecting a device outside a device discovery range forming a mesh network by receiving device information from another device in a Bluetooth mesh network.
  • the present invention provides a method for acquiring information of a device constituting a mesh network by a first device in a mesh network of Bluetooth for solving the above-described problem, comprising: configuration information or a device of the mesh network from a second device Receiving an advertising message including at least one of the information; Transmitting a connection request message to the second device based on the advertisement message; And establishing a Bluetooth LE connection with the second device based on the connection request message.
  • the configuration information may include ID information indicating the mesh network, type information of devices constituting the mesh network, configuration purpose information, name information of the mesh network, or the number of devices constituting the mesh network. At least one of the information.
  • the device information includes at least one of name information, type information or ID information of a specific device constituting the mesh network.
  • the present invention may also include transmitting a scan request message for requesting additional information related to the configuration information or device information to the second device; And receiving a response message including the additional information in response to the scan request message.
  • the advertisement message further includes a flag indicating that the second device is a device obtaining configuration information or device information of the mesh network.
  • the present invention also provides a method comprising: transmitting a read request message requesting additional information related to the configuration information or device information to the second device; And receiving a read response message including the additional information in response to the read request message.
  • the additional information may include ID information indicating the mesh network, type information of devices constituting the mesh network, configuration purpose information, name information of the mesh network, and information on the number of devices constituting the mesh network. And at least one of name information, type information, or ID information of a specific device constituting the mesh network.
  • the present invention also provides a method comprising: transmitting a request message for requesting network information related to a mesh network to a second device; Receiving a connection request message for establishing a Bluetooth LE connection to transmit the network information; Establishing a Bluetooth LE connection with the second device based on the connection request message; And receiving a response message including the network information from the second device, wherein the network information includes at least one of configuration information or device information of the mesh network.
  • the configuration information may include ID information indicating the mesh network, type information of devices constituting the mesh network, configuration purpose information, name information of the mesh network, or the number of devices constituting the mesh network. At least one of the information.
  • the device information includes at least one of name information, type information or ID information of a specific device constituting the mesh network.
  • the communication unit for communicating with the outside by wireless or wired;
  • a device for controlling to establish a Bluetooth LE connection with the second device based on the connection request message is provided.
  • a device forming a mesh network existing outside the search range of the device may be searched.
  • the present invention can search for a device forming a mesh network by receiving network information from a device having network information in a mesh network.
  • the present invention may search for devices forming a mesh network and output the searched result through the device.
  • FIG. 1 is a schematic diagram illustrating an example of a wireless communication system using a Bluetooth low power energy technology to which the present invention can be applied.
  • FIG. 2 shows an example of an internal block diagram of a device to which the present invention can be applied.
  • FIG. 3 shows an example of a Bluetooth low power energy topology.
  • FIG. 4 is a diagram illustrating an example of a Bluetooth communication architecture to which the present invention can be applied.
  • FIG. 5 is a diagram illustrating an example of a structure of a GATT (Generic Attribute Profile) based profile of Bluetooth low power energy.
  • GATT Generic Attribute Profile
  • FIG. 6 is a diagram illustrating an example of a device-to-device connection procedure of Bluetooth low power energy.
  • FIG. 7 is a schematic diagram illustrating an example of a Bluetooth mesh network to which the present invention may be applied.
  • FIG. 8 is a diagram illustrating an example of a protocol stack of a Bluetooth mesh network to which the present invention can be applied.
  • FIG. 9 is a flowchart illustrating an example of a method for a device to which the present invention may be applied to participate in a Bluetooth mesh network.
  • FIG. 10 is a diagram illustrating an example of a method for discovering a device in a Bluetooth mesh network to which the present invention can be applied.
  • 11 and 12 are diagrams illustrating an example of a method and a packet format for discovering a device in a Bluetooth mesh network to which the present invention can be applied.
  • 13 to 16 illustrate another example of a method and a packet format for discovering a device in a Bluetooth mesh network to which the present invention can be applied.
  • 17 and 18 are diagrams illustrating another example of a method and a packet format for discovering a device in a Bluetooth mesh network to which the present invention can be applied.
  • FIG. 19 is a diagram illustrating an example of a method of outputting a discovered device in a Bluetooth mesh network to which the present invention can be applied.
  • FIG. 1 is a schematic diagram illustrating an example of a wireless communication system using a Bluetooth low power energy technology to which the present invention can be applied.
  • the wireless communication system 100 includes at least one server device 120 and at least one client device 110.
  • the server device and the client device perform Bluetooth communication using Bluetooth Low Energy (BLE) technology.
  • BLE Bluetooth Low Energy
  • BLE technology Compared to Bluetooth Basic Rate / Enhanced Data Rate (BR / EDR) technology, BLE technology has a relatively small duty cycle, enables low-cost production, and significantly reduces power consumption through low data rates. If you use a coin cell battery, it can operate for more than a year.
  • BR / EDR Bluetooth Basic Rate / Enhanced Data Rate
  • the server device 120 may operate as a client device in relation to other devices, and the client device may operate as a server device in relation to other devices. That is, in the BLE communication system, any one device may operate as a server device or a client device, and if necessary, operate as a server device and a client device.
  • the server device 120 may include a data service device, a slave device device, a slave, a server, a conductor, a host device, a gateway, and a sensing device.
  • a sensing device a monitoring device (monitoring device), the first device, the second device, etc.
  • the client device 110 is a master device (master device), master (master), client, member (Member) ), A sensor device, a sink device, a collector, a control device, a first control device, a second control device, and the like.
  • the server device and the client device correspond to the main components of the wireless communication system, and the wireless communication system may include other components in addition to the server device and the client device.
  • the server device When the server device receives data from the client device and directly communicates with the client device, and receives a data request from the client device, the server device provides the data to the client device through a response.
  • the server device may read data from a memory unit or write new data to a corresponding memory in a process of transmitting and receiving a message with the client device.
  • one server device may be connected to a plurality of client devices, and may be easily reconnected (or connected) with client devices by using bonding information.
  • the client device 110 refers to a device that requests data information and data transmission from a server device.
  • the client device receives data from the server device through a notification message, an instruction message, and the like, and when receiving an instruction message from the server device, sends a confirmation message in response to the instruction message.
  • the client device may provide information to the user through an output unit or receive an input from the user through an input unit in the process of transmitting and receiving messages with the server device.
  • the client device may read data from a memory or write new data to a corresponding memory in a process of transmitting and receiving a message with the server device.
  • Hardware components such as an output unit, an input unit, and a memory of the server device and the client device will be described in detail with reference to FIG. 2.
  • the wireless communication system may configure Personal Area Networking (PAN) through Bluetooth technology.
  • PAN Personal Area Networking
  • the wireless communication system by establishing a private piconet between devices, files, documents, and the like can be exchanged quickly and securely.
  • FIG. 2 shows an example of an internal block diagram of a device to which the present invention can be applied.
  • the server device may include an output unit 111, a user input interface 112, a power supply unit 113, a processor 114, and a memory unit. , 115), a Bluetooth interface 116, another communication interface 117, and a communication unit (or a transceiver unit 118).
  • the output unit 111, the input unit 112, the power supply unit 113, the processor 114, the memory 115, the Bluetooth interface 116, the other communication interface 117 and the communication unit 118 are proposed herein. It is functionally linked to perform the method.
  • the output unit 121, the input unit 122, the power supply unit 123, the processor 124, the memory 125, the Bluetooth interface 126, and the communication unit 127 are used to perform the method proposed in this specification. Functionally connected
  • the Bluetooth interface 116, 126 refers to a unit (or module) capable of transmitting data or request / response, command, notification, indication / confirmation message, etc. between devices using Bluetooth technology.
  • the memories 115 and 125 are units implemented in various types of devices and refer to units in which various kinds of data are stored.
  • the processor 114, 124 refers to a module that controls the overall operation of the server device or the client device, and controls to process a message request and a received message through a Bluetooth interface and another communication interface.
  • the processors 114 and 124 may be represented by a controller, a control unit, a controller, or the like.
  • the processors 114 and 124 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • ASICs application-specific integrated circuits
  • the processor 114, 124 controls the communication unit to receive an advertising message from a server device, transmits a scan request message to the server device, and scans in response to the scan request from the server device.
  • the communication unit controls the communication unit to receive a scan response message, and controls the communication unit to transmit a connect request message to the server device for establishing a Bluetooth connection with the server device.
  • the processor 114 and 124 may also read or write data from the server device using a property protocol after a Bluetooth LE connection is formed through the connection procedure. To control.
  • the output units 111 and 121 refer to modules for providing device status information and message exchange information to a user through a screen.
  • the input units 112 and 122 refer to a module that provides a user's input to the controller like a screen button so that the user can control the operation of the device.
  • FIG. 3 shows an example of a Bluetooth low power energy topology.
  • a piconet means a set of devices occupying a shared physical channel in which any one of a plurality of devices is a master and the remaining devices are connected to the master device.
  • the BLE slave does not share a common physical channel with the master and other slaves. That is, each slave communicates with the master through a separate physical channel.
  • piconet F Another piconet with master device F and slave device G.
  • a scatternet means a group of piconets in which connections between other piconets exist.
  • Device K is a master of device L and a slave of device M.
  • Device O is also on scatternet O.
  • Device O is a slave of device P and a slave of device Q.
  • Device D is an advertiser and device A is an initiator (group D).
  • Device E is a scanner and device C is an advertiser (group C).
  • Device K is also an advertiser and device N is an initiator (group K).
  • Devices A and B use one BLE piconet physical channel.
  • Devices A and C use another BLE piconet physical channel.
  • device D advertises using an advertisement event connectable onto an advertising physical channel, and device A is an initiator.
  • Device A may establish a connection with device D and add the device to piconet A.
  • Group D and Group C may use different advertising physical channels or use different times to avoid collisions.
  • Piconet F has one physical channel. Devices F and G use one BLE piconet physical channel. Device F is the master and device G is the slave.
  • Group H has one physical channel. Devices H, I and J use one BLE advertising physical channel. Device H is an advertiser and devices I and J are scanners.
  • device K advertises using an advertisement event connectable onto an advertising physical channel
  • device N is an initiator.
  • Device N may form a connection with device K.
  • device K becomes a slave of two devices and simultaneously becomes a master of one device.
  • devices O and P use one BLE piconet physical channel.
  • Devices O and Q use another BLE piconet physical channel.
  • device R advertises using an advertisement event connectable onto an advertising physical channel, and device O is an initiator.
  • Device O may form a connection with device R.
  • device O becomes a slave of two devices and simultaneously becomes a master of one device.
  • FIG. 4 is a diagram illustrating an example of a Bluetooth communication architecture to which the present invention can be applied.
  • FIG. 4 shows an example of a protocol stack of Bluetooth Basic Rate (BR) / Enhanced Data Rate (EDR), and (b) shows a protocol stack of Bluetooth Low Energy (LE). An example is shown.
  • BR Basic Rate
  • EDR Enhanced Data Rate
  • LE Bluetooth Low Energy
  • the Bluetooth BR / EDR protocol stack has an upper controller stack 10 and a lower controller stack based on a host controller interface (HCI) 18. It may include a host stack (20) of.
  • HCI host controller interface
  • the host stack (or host module) 20 refers to a wireless transceiver module for receiving a 2.4 GHz Bluetooth signal and hardware for transmitting or receiving a Bluetooth packet.
  • the host stack (or host module) 20 is connected to a Bluetooth module which is the controller stack 10 to connect a Bluetooth module. Control and perform actions.
  • the host stack 20 may include a BR / EDR PHY layer 12, a BR / EDR baseband layer 14, and a link manager layer 16.
  • the BR / EDR PHY layer 12 is a layer for transmitting / receiving a 2.4 GHz radio signal and may transmit data by hopping 79 RF channels when using Gaussian Frequency Shift Keying (GFSK) modulation.
  • GFSK Gaussian Frequency Shift Keying
  • the BR / EDR baseband layer 14 plays a role of transmitting a digital signal, selects a channel sequence hopping 1400 times per second, and transmits a 625us length time slot for each channel.
  • the link manager layer 16 controls the overall operation (link setup, control, security) of the Bluetooth connection by using a link manager protocol (LMP).
  • LMP link manager protocol
  • the link manager layer 16 may perform the following functions.
  • the host controller interface layer 18 provides an interface between the host module and the controller module so that the host can provide commands and data to the controller, and the controller can provide events and data to the host.
  • the host stack (or host module) 20 may include a logical link control and adaptation protocol (L2CAP, 21), an attribute protocol (Protocol, 22), a generic attribute profile (GATT, 23), and a generic access profile. Profile, GAP, 24), BR / EDR profile 25.
  • L2CAP logical link control and adaptation protocol
  • Protocol 22
  • GATT generic attribute profile
  • GAP BR / EDR profile
  • the logical link control and adaptation protocol (L2CAP) 21 may provide one bidirectional channel for transmitting data to a specific protocol or profile.
  • the L2CAP 21 may multiplex various protocols, profiles, etc. provided by a higher layer of Bluetooth.
  • L2CAP of Bluetooth BR / EDR uses dynamic channel, supports protocol service multiplexer, retransmission, streaming mode, and provides segmentation, reassembly, per-channel flow control, and error control.
  • the generic attribute profile (GATT) 23 may be operable as a protocol describing how the attribute protocol 22 is used in the construction of services.
  • the general attribute profile 23 may be operable to specify how ATT attributes are grouped together into services, and may be operable to describe features associated with the services.
  • the attribute protocol 22 and the BR / EDR profile 25 define a service (or profile) using Bluet's BR / EDR and an application protocol for sending and receiving these data, and the Generic Access Profile , GAP, 24) define how devices are discovered, connected, and informed, and provide privacy.
  • the Bluetooth LE protocol stack is a controller stack 30 operable to handle timing-critical radio interface and a host operable to process high level data. It contains a stack (Host stack, 40).
  • the host stack may be implemented as part of an OS running on a processor module, or as an instance of a package on the OS.
  • controller stack and the host stack can be operated or executed on the same processing device in the processor module.
  • the controller stack 30 includes a physical layer (PHY) 32, a link layer 34, and a host controller interface 36.
  • PHY physical layer
  • link layer 34 link layer
  • host controller interface 36 host controller interface
  • the link layer 34 which transmits or receives a Bluetooth packet, creates a connection between devices after performing advertising and scanning functions using three advertising channels, and generates up to 257 bytes of data packets through 37 data channels. Provides the ability to send and receive.
  • the host stack includes a generic access profile (GAP) 40, a logical link control and adaptation protocol (L2CAP, 41), a security manager (SM, 42), an attribute protocol (ATT, 440), and a general attribute profile.
  • GAP generic access profile
  • L2CAP logical link control and adaptation protocol
  • SM security manager
  • ATT attribute protocol
  • 440 general attribute profile
  • GATT Generic Attribute Profile
  • GATT Generic Access Profile
  • LE profile 466
  • the host stack 40 is not limited to this and may include various protocols and profiles.
  • the host stack uses L2CAP to multiplex the various protocols, profiles, etc. provided by Bluetooth.
  • L2CAP Logical Link Control and Adaptation Protocol 41 may provide one bidirectional channel for transmitting data to a specific protocol or profile.
  • the L2CAP 41 may be operable to multiplex data among higher layer protocols, segment and reassemble packages, and manage multicast data transmission.
  • Bluetooth LE uses three fixed channels (one for the signaling channel, one for the Security Manager, and one for the Attribute protocol).
  • BR / EDR Base Rate / Enhanced Data Rate
  • Attribute Protocol (ATT) 43 defines a rule for accessing data of a counterpart device in a server-client structure. ATT has six message types (Request, Response, Command, Notification, Indication, Confirmation).
  • the Request message is a message for requesting specific information from the client device to the server device
  • the Response message is a response message to the request message, which is a message transmitted from the server device to the client device.
  • Command message A message sent from the client device to the server device to indicate a command of a specific operation.
  • the server device does not transmit a response to the command message to the client device.
  • Indication and Confirm message This message is transmitted from the server device to the client device for notification such as an event. Unlike the notification message, the client device transmits a confirmation message for the Indication message to the server device.
  • the present invention transmits a value for the data length when a long data request is made in the GATT profile using the attribute protocol (ATT, 43) so that the client can know the data length clearly, and from the server using the UUID (Characteristic) Can receive the value.
  • ATT attribute protocol
  • UUID Consumer User Data
  • the general access profile 45 is mainly used for device discovery, connection creation, and security procedures, and defines a method of providing information to a user, and defines the type of an attribute as follows.
  • UUID Universal Unique Identifier, value type
  • the LE profile 46 is mainly applied to a Bluetooth LE device as profiles having a dependency on GATT.
  • the LE profile 46 may be, for example, Battery, Time, FindMe, Proximity, Time, Object Delivery Service, and the like. Details of GATT-based Profiles are as follows.
  • the BLE procedure may be classified into a device filtering procedure, an advertising procedure, a scanning procedure, a discovery procedure, a connecting procedure, and the like.
  • the device filtering procedure is a method for reducing the number of devices performing a response to a request, an indication, a notification, and the like in the controller stack.
  • the advertising device or scanning device may perform the device filtering procedure to limit the device receiving the advertising packet, scan request or connection request.
  • the advertising device refers to a device that transmits an advertising event, that is, performs an advertisement, and is also referred to as an advertiser.
  • the scanning device refers to a device that performs scanning and a device that transmits a scan request.
  • the scanning device when the scanning device receives some advertising packets from the advertising device, the scanning device should send a scan request to the advertising device.
  • the advertising procedure may be used to provide periodic broadcast of user data to the scanning devices that are listening on the advertising channel.
  • Broadcast user data sent as part of an advertisement packet is dynamic data, while scan response data is generally static data.
  • the scanning device sends a scan request to the advertising device via the advertising physical channel to request additional user data from the advertising device.
  • the advertising device transmits a scan response that is a response to the scan request, including additional user data requested by the scanning device over the advertising physical channel.
  • the scanning procedure can be used while connected to other BLE devices in the BLE piconet.
  • Bluetooth devices Devices capable of Bluetooth communication (hereinafter referred to as “Bluetooth devices”) perform an advertisement procedure and a scanning procedure to find devices that are nearby or to be found by other devices within a given area.
  • the discovery procedure is performed asymmetrically.
  • a Bluetooth device that attempts to find another device around it is called a discovering device and listens for devices that advertise a scannable advertisement event.
  • Bluetooth devices discovered and available from other devices are referred to as discoverable devices, and actively broadcast advertising events so that other devices can scan through an advertising (broadcast) physical channel.
  • Both the discovering device and the discoverable device may already be connected with other Bluetooth devices in the piconet.
  • connection procedure is asymmetric, and the connection procedure requires the other Bluetooth device to perform the scanning procedure while the specific Bluetooth device performs the advertisement procedure.
  • the advertising procedure can be the goal, so that only one device will respond to the advertising.
  • the connection may be initiated by sending a connection request to the advertising device via the advertising (broadcast) physical channel.
  • the link layer LL enters the advertisement state by the instruction of the host (stack). If the link layer is in the advertisement state, the link layer sends advertisement packet data units (PDUs) in the advertisement events.
  • PDUs advertisement packet data units
  • Each advertising event consists of at least one advertising PDU, which is transmitted via the advertising channel indexes used.
  • the advertisement event may terminate when the advertisement PDU is transmitted through each of the advertisement channel indexes used, or may terminate the advertisement event earlier when the advertisement device needs to make space for performing another function.
  • the link layer enters the scanning state by the indication of the host (stack). In the scanning state, the link layer listens for advertising channel indices.
  • scanning states There are two types of scanning states: passive scanning and active scanning, each scanning type being determined by the host.
  • ScanInterval is defined as the interval (interval) between the starting points of two consecutive scan windows.
  • the link layer must listen for completion of all scan intervals in the scan window as instructed by the host. In each scan window, the link layer must scan a different advertising channel index. The link layer uses all available advertising channel indexes.
  • the link layer When passive scanning, the link layer only receives packets and does not transmit any packets.
  • the link layer When active scanning, the link layer performs listening to rely on the advertising PDU type, which may request advertising PDUs and additional information related to the advertising device from the advertising device.
  • the link layer enters the initiation state by the indication of the host (stack).
  • the link layer When the link layer is in the initiating state, the link layer performs listening for the advertising channel indexes.
  • the link layer listens for the advertising channel index during the scan window period.
  • the link layer enters the connected state when the device performing the connection request, i.e., the initiating device, sends the CONNECT_REQ PDU to the advertising device or when the advertising device receives the CONNECT_REQ PDU from the initiating device.
  • connection After entering the connected state, the connection is considered to be created. However, it does not need to be considered to be established at the time the connection enters the connected state. The only difference between the newly created connection and the established connection is the link layer connection supervision timeout value.
  • the link layer that performs the master role is called a master, and the link layer that performs the slave role is called a slave.
  • the master controls the timing of the connection event, and the connection event is the point in time when the master and the slave are synchronized.
  • BLE devices use the packets defined below.
  • the link layer has only one packet format used for both advertisement channel packets and data channel packets.
  • Each packet consists of four fields: Preamble, Access Address, PDU, and CRC.
  • the PDU When one packet is sent on an advertising physical channel, the PDU will be an advertising channel PDU, and when one packet is sent on a data physical channel, the PDU will be a data channel PDU.
  • Advertising channel PDU (Advertising Channel PDU )
  • the advertising channel PDU Packet Data Unit
  • PDU Packet Data Unit
  • the PDU type field of the advertising channel PDU included in the header indicates a PDU type as defined in Table 1 below.
  • Advertising PDU (Advertising PDU )
  • advertising channel PDU types are called advertising PDUs and are used in specific events.
  • ADV_IND Connectable Non-Oriented Ads Event
  • ADV_DIRECT_IND Connectable Directional Advertising Event
  • ADV_NONCONN_IND Non-Connectable Non-Oriented Ads Event
  • ADV_SCAN_IND Scannable Non-Oriented Ads Event
  • the PDUs are transmitted at the link layer in the advertisement state and received by the link layer in the scanning state or initiating state.
  • the advertising channel PDU type below is called a scanning PDU and is used in the state described below.
  • SCAN_REQ Sent by the link layer in the scanning state and received by the link layer in the advertising state.
  • SCAN_RSP Sent by the link layer in the advertising state and received by the link layer in the scanning state.
  • the advertising channel PDU type below is called the initiating PDU.
  • CONNECT_REQ Sent by the link layer in the initiating state and received by the link layer in the advertising state.
  • the data channel PDU has a 16-bit header, payloads of various sizes, and may include a message integrity check (MIC) field.
  • MIC message integrity check
  • the procedure, state, packet format, etc. in the BLE technology may be applied to perform the methods proposed herein.
  • FIG. 5 is a diagram illustrating an example of a structure of a GATT (Generic Attribute Profile) based profile of Bluetooth low power energy.
  • GATT Generic Attribute Profile
  • the GATT Generic Attribute Profile
  • a peripheral device for example, a sensor device serves as a GATT server, and has a definition of a service and a characteristic.
  • the GATT client sends a data request to the GATT server, and all transactions begin at the GATT client and receive a response from the GATT server.
  • the GATT-based operating structure used in the Bluetooth LE is based on Profile, Service, and Characteristic, and may form a vertical structure as shown in FIG. 5.
  • the profile consists of one or more services, and the service may consist of one or more features or other services.
  • the service divides data into logical units and may include one or more characteristics or other services.
  • Each service has a 16-bit or 128-bit identifier called the Universal Unique Identifier (UUID).
  • UUID Universal Unique Identifier
  • the characteristic is the lowest unit in the GATT based operation structure.
  • the property contains only one data and has a UUID of 16 bits or 128 bits similar to the service.
  • the property is defined as a value of various pieces of information and requires one attribute to contain each piece of information. Multiple properties of the above properties can be used.
  • the attribute consists of four components and has the following meaning.
  • Type the type of the attribute
  • Bluetooth LE has a variable link quality due to the characteristics of wireless transmission, and may cause a shadow area exceeding the radio propagation distance due to the one-to-one connection characteristic. Therefore, in order to solve such a problem, Bluetooth can form a mesh network with devices equipped with Bluetooth as a method for controlling a multi-hop connection between multiple devices.
  • FIG. 6 is a flowchart illustrating an example of a device-to-device connection procedure of Bluetooth low power energy.
  • the server device 110 transmits an advertising message to the client device 120 for a Bluetooth LE connection between the server device 110 and the client device 120 ( S6010).
  • the advertisement message is used to provide its own information to other devices using Bluetooth LE, and may include various information such as service information and user information provided by the device.
  • the client device 120 may transmit a scan request message to the server device when additional information about the server device is needed ( S6020).
  • the server device 110 When the server device 110 receives the scan request message from the client, the server device 110 includes the requested additional information in the scan response message and transmits it to the client device 120 (S6030).
  • step S6020 and the step S6030 are optional steps and are not essential steps.
  • the server device 110 When the server device 110 is a device to which the client device 120 is to be connected, based on the information included in the advertisement message and / or the scan response message transmitted from the server device, the server device 110 The connection request message for the connection is transmitted (S6040).
  • server device 110 and the client device 120 form a Bluetooth Low Energy (LE) connection (S6030).
  • LE Bluetooth Low Energy
  • This procedure allows Bluetooth devices to form a Bluetooth LE connection.
  • FIG. 7 is a schematic diagram illustrating an example of a Bluetooth mesh network to which the present invention may be applied.
  • the mesh network refers to a network in which a plurality of devices are connected like a network through Bluetooth to transmit and receive data.
  • the Bluetooth mesh network technology includes one or more devices for relaying (or relaying) a message between a source device 200-1 transmitting data and a destination device 200-2 receiving data.
  • the source device and the destination device may be referred to as edge nodes 200-1 and 200-2, and one or more devices relaying messages in the middle may relay relay messages. ) May be called.
  • the device may be configured as a device whose position is easily changed, that is, a device 200-1 and 200-2 having mobility and fixed devices without mobility in an initially installed state.
  • Each relay node contains a message cache of recently received messages. If the received message already exists in the message cache, the message is not relayed.
  • the message is relayed and the message is stored in the message cache.
  • Edge nodes are usually powered by a battery and can normally sleep and then wake up or interact periodically.
  • the edge node can process the received message if the following conditions are met.
  • the message is authenticated by a known network key.
  • the destination of the message is the unicast address of the edge node, or the broadcast address or group address is the address to which the edge node belongs.
  • Relay nodes are usually mains powered devices that are always awake and can transmit data they receive for other nodes.
  • the relay node may retransmit the received message to another node if the following conditions are met.
  • the message is authenticated by a known network key.
  • a field indicating whether or not the message is relayed is a value that allows relaying.
  • the destination address is not a unicast address assigned to the relay node.
  • the data may be classified into a floating method and a routing method according to a data transmission method of the relay nodes 200-3 and 200-4.
  • the floating method refers to a method in which relay nodes receiving a message shoot the air again in the air by using a property in which radio waves spread in all directions in the air.
  • the source device 200-1 transmits a message to the relay nodes 200-3 and 200-4 through broadcast channels, and the relay nodes receiving the message transmit the message to neighboring relay nodes again.
  • the transmission method to the destination device 200-2 The transmission method to the destination device 200-2.
  • a broadcasting channel is used to receive and retransmit a message, and the transmission range of the message can be extended.
  • the mesh network of the floating scheme is a dynamic network, and in the floating mesh network, a device may be able to receive and transmit (or retransmit) a message at any time as long as the device's density is satisfied.
  • the floating scheme has an advantage of being easy to implement, since a message is transmitted without direction, scalability problems may occur as the network expands.
  • a device when a device transmits a message, a plurality of devices receive the message and transmit the received message to another plurality of devices.
  • the number of devices constituting the mesh network can be adjusted between 100 and 1000, and the exact number of devices can be determined by various factors.
  • the routing device receiving the message determines the best routing route (s) for sending the message to an intermediate device or a destination device, and to which route to send the message based on the determined routing table. Determine whether or not.
  • the routing scheme has the advantage of scalability, but since each node has to maintain a routing table and transmit a message, the complexity increases as the message increases, requires more memory, and is less than the floating scheme.
  • the disadvantage is that it is dynamic and more difficult to implement.
  • FIG. 8 is a diagram illustrating an example of a protocol stack of a Bluetooth mesh network to which the present invention can be applied.
  • the protocol stack of the mesh network includes a bearer layer 81, a network layer 82, a transport layer 83, and an application layer 84.
  • the bearer layer 81 defines how messages are transmitted between nodes. That is, it determines the bearer to which the message is transmitted in the mesh network.
  • a mesh network there are an advertising bearer and a GATT bearer for transmitting a message.
  • the network layer 82 defines how a message is sent to one or more nodes in a mesh network and the format of network messages transmitted by the bearer layer 81.
  • the network layer 82 also defines whether the message is to be relayed or forwarded and how to authenticate and encrypt network messages.
  • the transport layer 83 provides the confidentiality of application messages to define the encryption and authentication of application data.
  • the application layer 84 defines a method, an application operation code and parameters related to how the upper layer application uses the transport layer 73.
  • FIG. 9 is a flowchart illustrating an example of a method for a device to which the present invention may be applied to participate in a Bluetooth mesh network.
  • a new device or a non-provisioned device must go through a provisioning procedure in order to join and operate in the mesh network.
  • the provisioning procedure refers to a procedure for authenticating an unauthenticated device and providing basic information (eg, a unicast address, various keys, etc.) for participating in a mesh network.
  • the provisioning procedure is a procedure for providing a provisioner (second device 400) of the mesh network to participate in the mesh network
  • the first device 300 is a network through the provisioning procedure
  • the address, keys, device identifier and various information for operating as part of the mesh network can be obtained.
  • the provisioning procedure is composed of an invitation step, an exchanging public key step, an authentication step, and a provisioning data distribution step.
  • the provisioning procedure may be performed through various kinds of bearers. For example, it may be performed by an advertising-based bearer, a mesh provisioning service-based bearer, or a mesh-based bearer.
  • the bearer based on the provisioning service means a bearer for exchanging and receiving provisioning data through the GATT Protocol of the existing Bluetooth LE, and the bearer based on the mesh is directly connected by the first device 300 and the second device 400. If there is no distance to send and receive data, it means a bearer that can send and receive provisioning data through a mesh network.
  • the first device 300 may be provisioned through the following provisioning procedure.
  • the inviting step begins with the second device 400 scanning the first device 300.
  • the first device transmits a beacon message to the second device 400 (S9010).
  • the beacon message includes the UUID of the first device 300.
  • the second device 400 scanning the first device 300 through the beacon message transmits an invitation message to the first device 300 (S9020).
  • the invitation message asks whether the first device 300 performs a provisioning procedure. If the first device 300 does not want the first device 300 to perform the provisioning procedure, the invitation message is ignored.
  • the capability message includes information indicating whether the first device 300 supports setting of a security algorithm, a public key, information indicating whether a value can be output to a user, and whether a value can be input from the user. It may include information indicating the.
  • the second device 400 and the first device 300 exchange public keys (S9050, S9060).
  • the second device 400 transmits an epoxy public key to the first device 300 and the first device 300.
  • Static public keys can be read from using out-of-band technology.
  • the second device 400 authenticates the first device 300 by performing an authentication procedure with the first device 300 (S9070).
  • the second device 400 and the first device 300 calculates and generates a session key.
  • the provisioning data may include an application key, a device key, a network key, an IVindex, a unicast address, and the like.
  • the first device 300 Upon receiving the provisioning data, the first device 300 transmits a completion message in response to the provisioning data, and the provisioning procedure is terminated (S9090).
  • FIG. 10 is a diagram illustrating an example of a method for discovering a device in a Bluetooth mesh network to which the present invention can be applied.
  • the Bluetooth mesh network may be composed of a stationary device and a mobile device having a high mobility because there is little or no mobility.
  • Non-flowable device may be devices that are fixed due to lack of mobility in an initially installed state such as a light device such as a light bulb, a TV, a switch, or the like.
  • An example of the mobile device may be a mobile terminal.
  • nine non-flowing devices S1 to S9 form a Bluetooth mesh network.
  • the S1 to S9 may transmit and receive a message through the above-described floating technique or routing technique.
  • the device 1 400 which is a mobile device, wants to search for a mesh network that exists around the device 1 400, the device 1 400 searches for nearby devices using various methods.
  • the device 1 400 scans an advertisement message transmitted by at least one of the devices S1 to S9, or establishes a Bluetooth LE connection with one of the devices S1 to S9 to obtain information of the mesh network. Can be obtained.
  • the present invention provides a method for the first device 400 to obtain information about the entire mesh network through S2, S3, or S5 within a search range.
  • each device forming the mesh network has information related to the mesh network
  • the first device 400 obtains the information related to the mesh network by obtaining the information from the device forming the mesh network. It provides a method for doing so.
  • 11 and 12 are diagrams illustrating an example of a method and a packet format for discovering a device in a Bluetooth mesh network to which the present invention can be applied.
  • the mobile device searches for all devices constituting the mesh network by receiving information related to the mesh network without establishing a Bluetooth LE connection with the device forming the mesh network. Can be.
  • At least one device forming the mesh network has information of all devices forming the mesh network.
  • the second device 500 constituting the mesh network may transmit an advertisement message including network information of the mesh network to neighboring devices in the advertisement state (S11010).
  • the second device may be a non-fluid device as described above, and the advertisement message may be periodically transmitted through a broadcast method.
  • the advertisement message may be configured in the packet format as shown in FIG. 12, wherein the AD Type field indicates the type of network information included and the AD Data field includes a specific value corresponding to the AD type.
  • Table 2 below shows an example of AD Type and AD Data that may be included in the advertisement message.
  • the network information may include configuration information including information related to the configuration of the mesh network and device information related to each device forming the mesh network.
  • the first device 400 may transmit a scan request message requesting additional information to the second device 500 (S11020).
  • the second device 500 may transmit a response message including the additional information to the first device 400 in response to the scan request message.
  • the first device 400 may search for all devices forming the mesh network, and transmit the specific information to the discovered device or transmit a control message indicating a specific operation. You can control the device.
  • 13 to 16 illustrate another example of a method and a packet format for discovering a device in a Bluetooth mesh network to which the present invention can be applied.
  • the first device 400 can discover the second device 500 and know that the second device 500 has information of all devices forming the mesh network. Can be.
  • the first device 400 transmits a connection request message to form a Bluetooth LE connection with the second device 500 (S13020), and performs an authentication procedure and a security procedure.
  • a Bluetooth LE connection may be formed with the second device 500 (S13030).
  • the first device 400 which has established a Bluetooth LE connection with the second device 500, reads a read request message to request network information related to the mesh network stored in the GATT data base of the second device 500. Read Request message) is transmitted (13040).
  • the second device 500 Upon receiving the read request message, the second device 500 transmits a read response message including network information stored in a GATT database to the first device 400 (S13050).
  • FIG. 14 illustrates an example of network information stored in a GATT data base of the second device
  • FIG. 16 illustrates an example of the read response message.
  • the first device 400 discovers all devices constituting the mesh network through the read response message, and transmits or receives a message with devices constituting the mesh network or instructs a specific device to perform a specific operation. You can send a message to control the discovered device.
  • FIG. 16B illustrates an example of a packet for transmitting and receiving data to and from a device forming a mesh network when the first device 400 joins the mesh network through the procedure described with reference to FIG. 9. .
  • the “CIVI” field may include an IV index value currently used in the mesh network.
  • -NID A Network ID value used as an ID for identifying a network key.
  • SEQ incremented each time a source device creates a new message, used to check for duplicate messages.
  • -SRC A value representing the ID of the device that first generated the ID Mesh Packet of the 16-bit node.
  • OP An operation code (Opcode) indicating the operation to be performed by the device corresponding to the DST.
  • the advertisement message may include network information and the flag described above.
  • a mobile device requests network information related to a mesh network from a device forming a mesh network, forms a Bluetooth LE connection with the requested device, and receives the network information to receive the mesh network. It is possible to search the entire device constituting.
  • At least one device forming the mesh network has information of all devices forming the mesh network.
  • the request message may be transmitted to neighboring devices through broadcasting in the form of the above-mentioned Bluetooth advertisement message.
  • the request message has a 2-byte header and payloads of various sizes.
  • the PDU type field included in the header may include an “ADV_MESH_IND” value indicating that the PDU type field is an advertisement message requesting the network information. If the PDU type field does not include the “ADV_MESH_IND” value, The AD Type may include a value indicating that the message is an advertisement message for requesting the network information.
  • the second device 500 may transmit an advertisement message including the network information to the first device 400 (S17020).
  • the network information may include configuration information including information related to the configuration of the mesh network and device information related to each device forming the mesh network.
  • the configuration information may include “Mesh ID”, “Mesh Type”, “Mesh Purpose” “Mesh Name”, and “Number of Member device”, and the device information includes “Member device ID” and “Member device name”. And “Member device type”.
  • the step S17020 is an optional step and may not be performed in this embodiment.
  • step S17020 If step S17020 is not performed or step S17020 is performed but all the network information has not been transmitted, the first device 400 as described above with reference to FIG. 6, the second device 500 In step S17030, a connection request message for establishing a Bluetooth LE connection may be received, and a Bluetooth LE connection may be formed through an authentication procedure and a security procedure (S17040).
  • the first device 400 which has established a Bluetooth LE connection with the second device 500, reads a read request message to request network information related to the mesh network stored in the GATT data base of the second device 500. Read Request message) is transmitted (17050).
  • the second device 500 Upon receiving the read request message, the second device 500 transmits a read response message including network information stored in a GATT data base to the first device 400 (S17060).
  • the network information stored in the GATT Data base of the second device 500 is the same as that of FIG. 14, and the format of the read response message is the same as that shown in FIG. 16.
  • the first device 400 that discovers all the devices constituting the mesh network through the read response message includes the devices constituting the mesh network using the packet formats shown in FIG. 12. It is possible to control the discovered device by sending and receiving a message and a control message or by transmitting a control message indicating a specific operation to a specific device.
  • FIG. 19 is a diagram illustrating an example of a method of outputting a discovered device in a Bluetooth mesh network to which the present invention can be applied.
  • the devices when the devices constituting the mesh network are searched through the method described with reference to FIGS. 11 to 18, the devices may be output through the output unit of the mobile device.
  • the first device 400 which is a mobile device, may search for mesh network 1 and mesh network 2 through the method described with reference to FIGS. 11 to 18. .
  • the first device 400 may output a search result through an output unit.
  • IDs of mesh networks such as G1 and G2
  • purposes of mesh networks such as light systems, and types of devices constituting the mesh network. And so on.
  • (c) may output the devices constituting the specific mesh network. For example, an ID of the selected mesh network, a device type of the selected mesh network, and a device name of each device may be output.
  • the user may select individual devices configuring the mesh network through the rotary selection button.
  • the first device 400 may output the searched mesh network and the devices configuring the searched mesh network.
  • the present disclosure relates to the transmission and reception of Bluetooth data, and more particularly, to a method and apparatus for discovering a device in a mesh network using Bluetooth Low Energy (LE) technology.
  • LE Bluetooth Low Energy

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé et un dispositif permettant d'obtenir, grâce à un dispositif, les informations des autres dispositifs, qui forment un réseau maillé, dans un réseau maillé utilisant le Bluetooth. Le procédé et le dispositif selon la présente invention activent : un message d'annonce comprenant des informations de configuration du réseau maillé et/ou des informations de dispositif qui doivent être reçues à partir d'un second dispositif ; un message de demande de connexion qui doit être transmis au second dispositif d'après le message d'annonce ; et une connexion Bluetooth LE avec le second dispositif, qui doit être formée en fonction du message de demande de connexion.
PCT/KR2016/002949 2015-03-24 2016-03-23 Procédé et dispositif de recherche de dispositif dans un réseau maillé utilisant le bluetooth WO2016153279A1 (fr)

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CN110930675A (zh) * 2019-12-06 2020-03-27 怀化学院 用电信息采集系统
CN114567870A (zh) * 2022-02-28 2022-05-31 海信视像科技股份有限公司 基于gatt的配网配账号方法、控制终端及显示设备

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