KR102017701B1 - Device and method for performing inter-device communication - Google Patents

Device and method for performing inter-device communication Download PDF

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Publication number
KR102017701B1
KR102017701B1 KR1020130091984A KR20130091984A KR102017701B1 KR 102017701 B1 KR102017701 B1 KR 102017701B1 KR 1020130091984 A KR1020130091984 A KR 1020130091984A KR 20130091984 A KR20130091984 A KR 20130091984A KR 102017701 B1 KR102017701 B1 KR 102017701B1
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South Korea
Prior art keywords
group owner
intent value
owner intent
group
value
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KR1020130091984A
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Korean (ko)
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KR20140022726A (en
Inventor
김정우
김진호
김서욱
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엘지전자 주식회사
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Priority to US13/965,743 priority Critical patent/US9386616B2/en
Publication of KR20140022726A publication Critical patent/KR20140022726A/en
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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
    • H04W84/20—Master-slave selection or change arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Abstract

A method of performing communication between devices and a device thereof are disclosed. In accordance with another aspect of the present invention, there is provided a method of performing communication, including: searching for a second device supporting communication between devices, receiving service information from the found second device, and receiving service information of the received second device and service information of the first device. In comparison, determining one of the first device and the second device as a group owner, and determining the other as a group client, the group owner intent value of the second device from the second device receiving the group owner intent value and the group owner intent value of the first device and the group owner intent value of the second device so that the group owner intent value of the device determined as the group owner has a larger value. And comparing the values with each other to set the group owner intent value of the first device.

Description

DEVICE AND METHOD FOR PERFORMING INTER-DEVICE COMMUNICATION}

The present invention relates to communication between devices, and more particularly, to a device and a method for performing communication using Wi-Fi Direct.

Inter-device communication may include Wi-Fi Direct, Bluetooth, Zigbee, and the like. Here, Wi-Fi is a communication network that can enjoy high-speed Internet near a place where an access device (AP) is installed through a wireless LAN. Wi-Fi Direct is a new version of existing Wi-Fi, a communication technology that allows devices to connect wirelessly with Wi-Fi without the Internet. There's no need for hotspots, routers, or access points. All you need is a device that supports Wi-Fi Direct so you can connect directly to each other to send and receive files or share your network.

As such, Wi-Fi Direct is a type of direct communication between devices equipped with Wi-Fi without going through an Access Point (AP) that supports connection between Wi-Fi Alliance devices.

Wi-Fi Direct connects two devices one-to-one by default. It connects smartphones, smartphones, laptops, mice, tablet PCs and printers directly with Wi-Fi Direct. In this way, you can easily transfer photos, music, and videos from your smartphone to another smartphone, print documents and photos stored on your tablet PC directly, synchronize contacts between your PC and smartphone, and play games directly between games. It can also be used for purposes.

You can also connect multiple devices to one device. Connect a monitor, printer, digital camera and mouse all at once to a laptop that supports Wi-Fi Direct. If the laptop is connected to the existing Wi-Fi network, other devices connected to the laptop can also access the Internet via the Wi-Fi network. However, one-to-many is an option.

Meanwhile, the Wi-Fi Direct devices determine each other to act as an AP when the first connection is made. Accordingly, the method of connecting a device in Wi-Fi Direct is as follows. Devices supporting Wi-Fi Direct transmit and receive control messages to each other to enable mutual recognition of which devices support Wi-Fi Direct, and transmit information required for interconnection through the control message. During this process, two different Wi-Fi Direct devices include a procedure for negotiating who will act as a group owner, where the group owner has control of the connected devices in the group of devices forming the Wi-Fi Direct network and serves as an AP. Means the device to perform. The negotiation method determines a group owner role by exchanging a group owner intent value of each of the two devices.

However, in the existing Wi-Fi Direct connection, a group owner is determined by comparing a predetermined group owner intent value, which is generally set to transmit an arbitrary value, so that an effective network connection such as controlling a specific device to be a group owner is performed. There was a problem that this was impossible.

In order to solve the above problems, the present invention is to provide a communication performing method that can determine the group owner in consideration of specific service information when the Wi-Fi direct connection.

Another object of the present invention is to provide a device and a communication performing method for dynamically changing a group owner intent value of a device so as to correspond to a group owner determined to be suitable for a specific situation.

Technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present disclosure, a method for performing device-to-device communication of a first device according to an embodiment of the present invention may include: searching for a second device supporting device-to-device communication and receiving service information from the found second device; step; The received service information of the second device and the service information of the first device are compared to determine one of the first device and the second device as a group owner, and the other is the group client ( determining as a group client; Receiving a group owner intent value of the second device from the second device and allowing the group owner intent value of the device determined as the group owner to have a larger value; And comparing the group owner intent value of the device with the group owner intent value of the second device to set the group owner intent value of the first device.

Here, when it is determined that the first device is the group owner, setting the group owner intent value of the first device may include a group owner intent value of the first device and a group owner of the second device. Comparing the tent values; And when the group owner intent value of the first device is smaller than the group owner intent value of the second device, the group owner intent value of the first device is set to the group owner intent of the second device. Can be set larger than the value.

On the other hand, when it is determined that the first device is a client of the group, setting the group owner intent value of the first device may include a group owner intent value of the first device and a group owner of the second device. Comparing the intent values; And when the group owner intent value of the first device is greater than the group owner intent value of the second device, the group owner intent value of the first device is set to the group owner intent of the second device. Can be set smaller than the value.

The service information may include at least one of device type information, group owner request information, internet access information, and environment setting information indicating one of a mobile phone and a vehicle head unit.

In the determining of the group owner, the group owner may be determined based on a field value of the group owner request information.

The method of performing communication may further include transmitting the set group owner intent value of the first device to the second device.

Meanwhile, a first device for performing device-to-device communication for achieving the object of the present invention includes a receiver for searching for a second device supporting device-to-device communication and receiving service information from the found second device. By comparing the service information of the second device and the service information of the first device, one of the first device and the second device is determined as a group owner, and the other is the group client. And a processor for determining, wherein the receiver receives a group owner intent value of the second device from the second device, and the processor is a group owner of the device determined to be the group owner. The group owner intent value of the first device is compared with the group owner intent value of the second device so that an intent value has a larger value. Set the value of the tent.

Here, when it is determined that the first device is the group owner, the processor compares the group owner intent value of the first device with the group owner intent value of the second device, and, as a result of the comparison, When the group owner intent value of the first device is smaller than the group owner intent value of the second device, the group owner intent value of the first device may be set larger than the group owner intent value of the second device.

On the other hand, when it is determined that the first device is a client of the group, the processor compares the group owner intent value of the first device with the group owner intent value of the second device, and compares the result. When the group owner intent value of the first device is greater than the group owner intent value of the second device, the group owner intent value of the first device may be set smaller than the group owner intent value of the second device. .

The service information may include at least one of device type information, group owner request information, internet access information, and environment setting information indicating one of a mobile phone and a vehicle head unit.

Here, the processor may determine the group owner based on the field value of the group owner request information.

The first device may further include a transmitter for transmitting a message including the set group owner intent value of the first device to the second device.

In the method of performing communication according to the present invention, the existing Wi-Fi Direct function may be maintained, but a specific device may be a group owner by changing a group owner intent value for a specific situation.

Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 is a diagram illustrating a configuration of a Wi-Fi Direct network.
2 is a block diagram illustrating a configuration of a device for performing communication using Wi-Fi Direct.
3 is a flowchart illustrating a communication performing method using Wi-Fi Direct according to an embodiment of the present invention.
4 is a flowchart illustrating a method of setting a group owner intent value according to an embodiment of the present invention.
5 is a view briefly illustrating a communication performing procedure using Wi-Fi Direct according to an embodiment of the present invention. And,
6 is a flowchart illustrating a communication performing procedure using Wi-Fi Direct according to an embodiment of the present invention.

The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details. For example, the following detailed description will be described assuming that the mobile communication system is an Institute of Electrical and Electronics Engineers (IEEE) 802.16 system, a 3rd Generation Partnership Project (3GPP), but is unique to the IEEE 802.16 system and 3GPP. It is applicable to any other mobile communication system except for this.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention.

In addition, in the following description, it is assumed that a terminal device collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like. In addition, it is assumed that the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a base station (BS), and an access point (AP).

The information transmitted or received by the terminal device includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

The present invention relates to a terminal device that supports communication between devices. Here, the communication between devices may include Wi-Fi Direct, Bluetooth, Zigbee, and the like. For convenience of explanation, hereinafter, communication between devices will be limited to Wi-Fi Direct.

1 is a diagram illustrating a configuration of a Wi-Fi Direct network.

Wi-Fi is a wireless communication technology widely used worldwide under the IEEE 802.11 standard. It is used in various devices such as laptops, mobile phones, console game consoles, MP3s, cameras, and printers. Wi-Fi is recognized as a representative technology of wireless LAN (WLAN) for accessing the Internet, and is a technology capable of communicating around an access point called an access point (AP). Therefore, Wi-Fi installed in various devices is a structure that can communicate only when connected to an AP, which is a network access point.

However, the Wi-Fi Alliance (WFA) has proposed a new standard, Wi-Fi Direct, that supports peer to peer (P2P) between Wi-Fi. Wi-Fi Direct is a wireless communication technology that allows direct communication between Wi-Fi-enabled devices without going through an access point (AP) that supports connection between Wi-Fi devices.

Wi-Fi Direct connects two devices one-to-one by default. It connects mobile phones, mobile phones, laptops and mice, tablet PCs and printers directly with Wi-Fi Direct. In this way, you can easily transfer photos, music, and videos from your smartphone to another smartphone, print documents and photos stored on your tablet PC directly, synchronize contacts between your PC and smartphone, and play games directly between games. It can also be used for purposes.

Referring to FIG. 1, the mobile terminal device 100 and the vehicle head unit 150 may communicate with each other using Wi-Fi Direct technology. As such, the Wi-Fi Direct technology may connect the mobile terminal 100 and the vehicle head unit 150 to share navigation, TV output, music playback, social service, and vehicle information display with each other.

Meanwhile, in FIG. 1, one mobile terminal device 100 and one vehicle head unit 150 are connected using Wi-Fi Direct. However, in some cases, a plurality of mobile terminal devices and one vehicle head unit or one vehicle terminal unit 150 may be connected. The mobile terminal and the plurality of vehicle head units may be connected using Wi-Fi Direct.

In another embodiment, a monitor, a printer, a digital camera and a mouse are simultaneously connected to a notebook that supports Wi-Fi Direct. If the laptop is connected to the existing Wi-Fi network, other devices connected to the laptop can also access the Internet via the Wi-Fi network. However, one-to-many is an option.

2 is a block diagram illustrating a configuration of a device 200 that performs communication using Wi-Fi Direct. The mobile terminal device 100 and the vehicle head unit 150 of FIG. 1 supporting Wi-Fi Direct may include all the configurations of the device 200 described with reference to FIG. 2.

Referring to FIG. 2, a device 200 that communicates using Wi-Fi Direct includes a transmit (Tx) data processor 210, a symbol modulator 220, a transmitter 230, a transmit / receive antenna 240, and a receiver 250. ), A symbol demodulator 260, a receive data processor 270, a processor 280, and a memory 290. Although the transmission and reception antenna 240 is shown as one, it may be provided with a plurality of transmission and reception antennas. Accordingly, the device 200 according to the present invention supports a multiple input multiple output (MIMO) system. In addition, the device 200 according to the present invention may support both a Single User-MIMO (SU-MIMO) and a Multi User-MIMO (MU-MIMO) scheme.

The transmit data processor 210 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols (“data symbols”). To provide. The symbol modulator 220 receives and processes these data symbols and pilot symbols to provide a stream of symbols.

The symbol modulator 220 multiplexes data and pilot symbols and sends it to the transmitter 230. In this case, each transmission symbol may be a data symbol, a pilot symbol, or a null signal value. In each symbol period, pilot symbols may be sent continuously. The pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.

Transmitter 230 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency up-converts) these analog signals, A signal suitable for transmission over a wireless channel is generated, and the transmission antenna 240 transmits the generated signal to another device.

Meanwhile, the receiving antenna 240 receives a signal from another device and provides the received signal to the receiver 250. Receiver 250 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples. The symbol demodulator 260 demodulates the received pilot symbols and provides them to the processor 280 for channel estimation.

The symbol demodulator 260 also receives a frequency response estimate from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols) and the data. The symbol estimates are provided to a receive (Rx) data processor 270. Receive data processor 270 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.

The processing by the symbol demodulator 260 and the receiving data processor 270 is complementary to the processing by the symbol modulator 120 and the transmitting data processor 115.

The processor 280 instructs (eg, controls, coordinates, manages, etc.) the operation in the device 200. The processor 280 may be connected to a memory 290 that stores program codes and data. Memory 290 is coupled to processor 280 to store operating systems, applications, and general files.

The processor 280 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like. On the other hand, the processor 280 may be implemented by hardware (hardware) or firmware (firmware), software, or a combination thereof. When implementing embodiments of the present invention using hardware, application specific integrated circuits (ASICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) configured to perform the present invention. Field Programmable Gate Arrays (FPGAs) may be provided in the processor 280.

Meanwhile, when implementing embodiments of the present invention using firmware or software, the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention. Firmware or software configured to be may be included in the processor 280 or stored in the memory 290 to be driven by the processor 280.

In addition to the components shown in FIG. 2, the device 200 according to the present invention may further include various components as necessary. For example, when the device 200 is a mobile terminal device, in addition to the components for performing wireless communication of FIG. 2, an A / V input unit and a button including a camera and a microphone to receive audio and video video signals are provided. Sensing unit that can detect current ecology such as user input unit receiving user's motion control, touch sensor, keypad, etc., location, orientation, acceleration, deceleration, presence of user contact, display, speaker, haptic Output unit for generating output related to sight, hearing or tactile sense including motor, interface unit for connecting with external devices including wired / wireless headset port, external charger port, earphone port, memory card port, and processor Component of power supply unit for supplying power for operation of each component by receiving external power and internal power by It may further comprise cattle.

Hereinafter, an embodiment related to a wireless communication method that may be implemented in a device configured as described above will be described with reference to the accompanying drawings.

For convenience of description, it is assumed that a device for performing inter-device communication according to the present invention includes at least one of the components shown in FIG. 2. In addition, hereinafter, the first device and the second device are concepts for dividing a device to which the present invention is applied into a receiving side and a transmitting side. It is also assumed that the first and second devices belong to the same network group.

Specifically, the first device for performing device-to-device communication according to the present invention includes a receiver for searching for a second device supporting device-to-device communication among the components shown in FIG. 2 and receiving service information from the found second device. The received service information of the second device and the service information of the first device are compared to determine one of the first device and the second device as a group owner, and the other is the group client ( and a processor that determines a group client, wherein the receiver receives a group owner intent value of the second device from the second device, and the processor determines that the group owner is the group owner. The group owner intent value of the first device and the group owner intent value of the second device are compared with each other so that the group owner intent value of the device has a larger value. You can set the group owner intent value.

In some cases, the first device may be designed in a configuration that further includes a transmitter for transmitting the set group owner intent value of the first device to the second device.

Alternatively, the first device may further include a memory for storing a group intent value of the first device, service information received from the second device, and a group intent value of the second device.

Based on the above-described assumptions, a method of performing communication using Wi-Fi Direct according to the present invention will now be described with reference to FIG. 3.

3 is a flowchart illustrating a communication performing method using Wi-Fi Direct according to an embodiment of the present invention.

Referring to FIG. 3, the first device according to an embodiment of the present invention searches for a second device supporting Wi-Fi Direct (S300). In detail, the first device may detect a beacon signal transmitted from a second device in the vicinity, and proceed with a device discovery procedure to detect a second device supporting Wi-Fi Direct.

In operation S300, the first device may receive service information from the discovered second device (S310). Here, the service information is attribute information of the device and is information including at least one of device type information, group owner request information, internet access information, and environment setting information. The service information may be P2P attribute ID Definitions defined in Wi-Fi Direct as shown in Table 1 below.

Attribute ID Note 0 Status One Minor reason code 2 P2P Capability 3 P2P Device ID 4 Group Owner Intent 5 Configuration Timeout 6 Listen Channel 7 P2P Group BSSID 8 Extended Listen Timing 9 Intended P2P Interface Address 10 P2P Manageability 11 Channel List 12 Notice of Absence 13 P2P Device Info 14 P2P Group Info 15 P2P Group ID 16 P2P Interface 17 Operating Channel 18 Invitation Flags 19-220 Reserved 221 Vendor Specific Attribute 222-255 Reserved

In operation S310, the first device that has received the service information may determine whether the Wi-Fi Direct connection is based on a car connectivity service based on the service information. As a result of the determination, the first device may proceed to the next step S320 only if the Wi-Fi direct connection based on the car connection service, otherwise, proceed to the group owner negotiation step according to the general Wi-Fi direct connection. Such determination may be performed using difference connection service information that may be defined in one of the reserved fields of Table 1. The secondary connection service attribute ID information may be determined with reference to the Attribute ID field of Table 2 below. However, the determination of whether or not the Wi-Fi Direct connection based on the car connection service is an optional step.

Field Size (octets) value Description Attribute ID One 19-220, 222-255 Identifying the type of P2P attribute.
Length 5 Length of the following fields in the attribute Mirrorlink
MajorVersion One Variable Information about the major version of MirrorLink the device supports Mirrorlink
MinorVersion One Variable Information about the minor version of MirrorLink the device supports Mirrorlink
SubminorVersion One Variable Information about the sub-minor version of MirrorLink the device supports Device type One Variable Indicating the device type between MirrorLink Server and MirrorLink Client. If it is set to 0, it indicates the P2P Device is MirrorLink Server. If it is set to 1, it indicates the P2P Device is MirrorLink Client GO request One Variable Information that is used to decide if P2P Device received this attribute information needs to re-configure its GO Intent value.

Meanwhile, service information as shown in Tables 1 and 2 may be obtained through a Device Discovery frame or a GO (Group Owner) Negotiation frame. The device discovery frame is a frame transmitted / received by the GO (Group Owner) Negotiation frame in the device discovery procedure and will be described later with reference to FIGS. 5 and 6.

After operation S310, the first device compares the received service information of the second device with the service information of the first device, and determines one of the first device and the second device as the group owner, and the other is the group client. It may be determined as (S320).

As a first embodiment of the method of determining the group owner, the group owner may be determined based on the GO request field of the service information as shown in Table 2. Here, the GO request field may be referred to as group owner request information. When the GO request of the service information received from the second device has a value of '1', the first device may determine the second device as the group owner. Meanwhile, when the Go request of the service information of the first device has a value of '1', the first device may determine the first device as the group owner. If the GO requests of the first and second devices are both '1' or both are '0', the first device may randomly select one and determine the group owner. Alternatively, the first device may proceed to the group owner negotiation step defined in the general Wi-Fi Direct specification without changing the group owner intent value to determine the group owner. On the other hand, the GO request value, that is, the group owner request information may be set by the user of each device, but may be preset from the time of manufacture.

In addition, referring to the second embodiment of the method of determining the group owner, the group owner may be determined based on the device type field of the service information as shown in Table 2 below. Here, the device type field may be referred to as device type information. The device type information in the car connection service is information indicating which of the mobile phone and the vehicle head unit is. If the device type information received from the second device indicates that the mobile phone, the first device may determine the second device as the group owner. In this case, since the Internet connection is possible to perform the role of the AP, there is an effect of extending the Internet connection to the vehicle head unit, so that the mobile phone is determined as the group owner.

Conversely, if the device type information received from the second device indicates that the vehicle head unit, the first device may determine the second device as the group owner. In this case, the power management is more important than the expansion of the Internet connection, the vehicle head unit has no power burden than the mobile phone, and multiple devices capable of direct Wi-Fi direct connection in the car are connected to the group client and the car audio / video It is determined that the head unit for a vehicle is a group owner in that the multimedia file can be played through the system and the file sharing is possible between a plurality of connected devices. As such, the criterion of determination of the group owner may be set by the user or may be preset from the time of manufacture.

After operation S320, the first device may receive a message including a group owner intent value of the second device from the second device (S330). In more detail, a GO Negotiation Request message may be received from a second device. The GO Negotiation Request message may further include service information such as Table 1 and Table 2 as well as the group owner intent value. Here, the group owner intent value is a value used to determine the group owner. Wi-Fi Direct defines that group owner intent values can have a minimum value of 0 and a maximum of 15 values.

The first device compares the group owner intent value of the first device with the group owner intent value of the second device so that the group owner intent value of the device determined as the group owner has a larger value. The group owner intent value of the device may be set (S340). In Wi-Fi Direct, a device having a larger value may be determined as a group owner by comparing the group owner intent value of each connected device. Accordingly, the first device may adjust the group owner intent value of the first device to correspond to the group owner and the group client determined in step S320. However, when the group owner intent value corresponds to the group owner determined in step S320, the first device may use the group owner intent value without adjusting the group owner intent value of the first device. For example, when the first device is determined to be a group owner, the group owner intent value of the first device is '10', and the group owner intent value of the second device is '11', the first device may be configured as the group owner. The group owner intent value of the first device may be adjusted to have a value of '10' to '12 -15 'so as to have a value greater than' 11 'which is the group owner intent value. Conversely, when the first device is determined to be a group client, the group owner intent value of the first device is '10', and the group owner intent value of the second device is '9', the first device is the group owner of the second device. The group owner intent value of the first device may be adjusted to have a value from '10' to '0-9' to have a value smaller than the intent value '9'. However, when the first device is determined to be the group owner, the group owner intent value of the first device is '10', and the group owner intent value of the second device is '9', the group owner intent value of the first device. Since it is larger than the group owner intent value of the second device, the group owner intent value can be used as it is without any adjustment. A specific method of setting the group owner intent value of the first device will be described later with reference to FIG. 4.

In operation S350, the first device may transmit a message including the set group owner intent value of the first device to the second device. In detail, the first device may transmit a GO Negotiation Response message including the group owner intent value of the first device set in step S340 to the second device.

Hereinafter, a method of setting a group owner intent value will be described in detail with reference to FIG. 4. 4 is a flowchart in which step S340 of FIG. 3 is embodied, and assumes a state in which steps S300 to S330 are performed.

Referring to FIG. 4, when the first device determines that the first device is determined to be the group owner (S400-No), the first device determines the group owner intent value of the first device and the group owner in of the second device. Compare tent values. When the group owner intent value of the first device is greater than the group owner intent value of the second device (S410-No), the group owner intent value of the first device is set to the group owner intent of the second device. It may be set smaller than the tent value (S420). On the other hand, when the comparison result shows that the group owner intent value of the first device is smaller than the group owner intent value of the second device (S410-Yes), the group owner intent value of the first device can be used as it is without adjustment ( S430).

Meanwhile, when the first device determines that the first device is determined to be the group owner (S400-Yes), the first device compares the group owner intent value of the first device with the group owner intent value of the second device. Can be. When the group owner intent value of the first device is smaller than the group owner intent value of the second device (S440-No), the group owner intent value of the first device is set to the group owner intent of the second device. It may be set larger than the tent value (S450). On the other hand, when the comparison result shows that the group owner intent value of the first device is larger than the group owner intent value of the second device (S440-Yes), the group owner intent value of the first device can be used as it is without adjustment ( S430).

Although FIG. 4 illustrates that the group owner intent value of the first device is set, the group owner intent value of the second device may be set such that the group owner intent value of the device determined as the group owner has a larger value. have. In this case, the set group owner intent value of the second device may be included in the GO Negotiation Response message and transmitted to the second device. As described above, the group owner intent value of the device determined as the group owner may be set to have a larger value by adjusting the group owner intent value of the second device rather than the group owner intent value of the first device. Therefore, when the first device needs to adjust the group owner intent value (that is, S410-no or S440-no), the user may have one of the group owner intent value of the first device and the group owner intent value of the second device. You can choose either one to mark and adjust.

By the above-described communication method, the group owner intent value can be set dynamically to determine the group owner suitable for a specific situation.

Hereinafter, a communication performing procedure using Wi-Fi Direct according to an embodiment of the present invention will be described with reference to FIGS. 5 and 6.

5 is a view briefly illustrating a communication performing procedure using Wi-Fi Direct according to an embodiment of the present invention.

Referring to FIG. 5, a first device and a second device supporting Wi-Fi Direct perform a Device Dicovery Procedure (S510) and a Group formation Procedure (S520) to connect to each other (Connection, S530). Can be.

The Device Discovery Procedure (S510) is a procedure of searching for a device supporting Wi-Fi Direct and exchanging information for connection. In the above procedure, each device may exchange information as shown in Tables 1 and 2. In the present invention, the device discovery procedure (S510) may further perform the operation of determining the group owner.

The Group Formation Procedure (S520) is a procedure of forming a group between devices to be connected, and is a procedure of exchanging information required for group formation with each other. In the above procedure, each device may exchange information on group formation, one of which may be a group owner intent value. In the present invention, the group form procedure (S520) may further perform an operation of dynamically setting the group owner intent value.

FIG. 6 is a diagram illustrating a communication performing procedure of FIG. 5 in detail.

Referring to FIG. 6, the first device may detect a beacon signal transmitted from the second device (S610) and perform a device discovery procedure with the second device. In detail, the second device and the device discovery frame may be exchanged to exchange information necessary for connection (S620). Here, the Device Discovery Frame may include information as shown in Tables 1 and 2. The first device may determine a GO (Group Owner) in the device discovery procedure. The first device may determine the GO based on the service information included in the device discovery frame. Detailed description of the GO determination has been described above with reference to FIG.

The first device may perform a group forming procedure (S520) with the second device. In detail, the first device may receive a GO Negotiation Request from the second device (S640). Here, the GO Negotiation Request may further include service information as shown in Table 1 and Table 2 as well as the group owner intent value. In operation S630, the first device compares the group owner intent values of the first device and the second device so that the group owner intent value of the device determined as the group owner has a larger value. The owner intent value may be set (S660).

The first device transmits the GO Negotiation Response including the set group owner intent value of the first device to the second device (S670), so that the second device can check the group owner intent value of the first device. do. According to the above procedure, the first device and the second device determine the group owner and the group client, and the second device terminates the group forming procedure by sending the GO Negotiation Confirmation to the first device. When the group forming procedure is completed, a communication connection between the first device and the second device may be established. Of course, a procedure such as authentication and association may be performed after the group formation procedure, but a detailed description thereof will be omitted since it is not directly related to the present invention.

The wireless communication method according to an embodiment of the present invention described above has an effect of determining a group owner according to a specific situation when a connection using Wi-Fi Direct is made, without changing the existing Wi-Fi Direct specification.

In detail, the group owner intent value may be dynamically set in order to determine a group owner suitable for a specific situation and to determine a device that is determined to be a group owner as a group owner, thereby enabling efficient group operation.

According to an embodiment of the present invention, the above-described method (operation flowchart) can be implemented as code that can be read by a processor in a medium in which a program is recorded. Examples of processor-readable media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may be implemented in the form of a carrier wave (for example, transmission over the Internet). Include.

The apparatus for performing communication using Wi-Fi Direct described above is not limited to the configuration and method of the above-described embodiments, the embodiments are all or all of the embodiments so that various modifications can be made Some may be optionally combined.

Transmitter: 230 Receiver: 250
Processor: 280 Memory: 290

Claims (12)

In the method of performing communication between devices of the first device,
Searching for a second device supporting device-to-device communication and receiving service information from the discovered second device;
The received service information of the second device and the service information of the first device are compared to determine one of the first device and the second device as a group owner, and the other is the group client ( determining as a group client;
Receiving a group owner intent value of the second device from the second device; And
The group owner intent value of the first device is compared with the group owner intent value of the second device so that the group owner intent value of the device determined to be the group owner has a larger value. Setting a group owner intent value. The method of claim 1,
If the first device is determined to be the group owner,
The setting of the group owner intent value of the first device may include:
Comparing the group owner intent value of the first device with the group owner intent value of the second device; And
As a result of the comparison, when the group owner intent value of the first device is smaller than the group owner intent value of the second device, the group owner intent value of the first device is set to the group owner intent value of the second device. Communication setting method characterized in that the larger setting. The method of claim 1,
If it is determined that the first device is a client of the group,
The setting of the group owner intent value of the first device may include:
Comparing the group owner intent value of the first device with the group owner intent value of the second device; And
As a result of the comparison, when the group owner intent value of the first device is greater than the group owner intent value of the second device, the group owner intent value of the first device is set to the group owner intent value of the second device. A method of performing communication, characterized in that smaller setting. The method of claim 1,
The service information is
And at least one of device type information, group owner request information, internet access information, and environment setting information indicating any one of a mobile phone and a vehicle head unit. The method of claim 4, wherein
Determining the group owner,
And determining a group owner based on the field value of the group owner request information. The method of claim 1,
And transmitting the set group owner intent value of the first device to the second device. A first device for performing device-to-device communication,
A receiver for searching for a second device supporting device-to-device communication and receiving service information from the found second device; And
The received service information of the second device and the service information of the first device are compared to determine one of the first device and the second device as a group owner, and the other is the group client ( includes a processor as determined by the group client),
The receiver receives a group owner intent value of the second device from the second device,
The processor compares the group owner intent value of the first device with the group owner intent value of the second device such that the group owner intent value of the device determined to be the group owner has a larger value. And setting a group owner intent value of the first device. The method of claim 7, wherein
The processor,
If the first device is determined to be the group owner,
The group owner intent value of the first device is compared with the group owner intent value of the second device, and as a result of the comparison, the group owner intent value of the first device is the group owner intent value of the second device. If smaller, the group owner intent value of the first device is set larger than the group owner intent value of the second device. The method of claim 7, wherein
The processor,
If it is determined that the first device is a client of the group,
The group owner intent value of the first device is compared with the group owner intent value of the second device, and as a result of the comparison, the group owner intent value of the first device is the group owner intent value of the second device. If larger, the group owner intent value of the first device is set to be smaller than the group owner intent value of the second device. The method of claim 7, wherein
The service information is
A first device comprising at least one of device type information, group owner request information, Internet access information, and environment setting information indicating any one of a mobile phone and a vehicle head unit. The method of claim 10,
The processor,
And determining a group owner based on the field value of the group owner request information. The method of claim 7, wherein
And a transmitter for transmitting the set group owner intent value of the first device to the second device.
KR1020130091984A 2012-08-14 2013-08-02 Device and method for performing inter-device communication KR102017701B1 (en)

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