KR101260913B1 - Apparauts and method for performing communication using wi-fi direct - Google Patents

Abstract

PURPOSE: A device for executing communication by using Wi-Fi and a method thereof are provided to execute communication by using Wi-Fi in a specific group. CONSTITUTION: A first device receives a message from a second device which belongs to a specific group(S520). The message includes a first group owner intent value of the second device. The first device determines a specific group owner based on a first group intent owner value of the first device and the received first group intent owner value of the second device(S530). When the first group intent value of the first device is greater than the first group owner intent value of the second device, the first device determines the group owner of the specific group. [Reference numerals] (AA,EE,II) Yes; (BB,FF,JJ) No; (CC) Allocate the first group owner intent value of a first device to be maintained(First group owner intent value = 15); (DD,GG) Determine the first device as a group owner and connect to the group owner; (HH) Determine the second group owner intent value of the first device(Second group owner intent value = First group owner intent value - (Random_number%3), Count = Count + 1; (S510) First group owner intent value of the first device = 15, Count = 0; (S520) Receive the first group owner intent value of a second device; (S530) First group owner intent value of the second device = 15, Count = 0; (S540) Receive the second group owner intent value of the second device; (S545) Second group owner intent value of the second device = 15; (S555) Second group owner intent value of the second device = second group owner intent value of the first device, Count < 3; (S560) Determine a device with higher group owner intent value between the first device and the second device as a group owner

Description

Apparauts and method for performing communication using Wi-Fi direct}

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

Wi-Fi is a communication network that allows you to enjoy high-speed Internet access near where your AP is installed. Wi-Fi Direct is a new version of Wi-Fi, a communication technology that allows devices to connect to Wi-Fi wirelessly without the need for an Internet network. 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. If only one of the devices you connect supports Wi-Fi Direct, there's nothing wrong with connecting directly. For example, 'personal Wi-Fi'. Wi-Fi technology, developed to replace the Internet line, is now evolving into a technology that allows devices to communicate directly.

As such, WiFi Direct is a type of direct communication between devices equipped with Wi-Fi without going through a Wi-Fi Direct AP (Access Point) that supports connection between Wi-Fi Alliance devices. The Wi-Fi Direct certification program is developed and managed by the Wi-Fi Alliance, which develops standard programs that are the basis of CERTIFIED and owns Wi-Fi trademark rights.

Traditional Wi-Fi networks are based on control devices known as wireless access points (called base stations, or hot spots). These devices typically have three key functions: Physical support for wired and wireless networks, bridging and routing between network devices, and provisioning services for connecting and disconnecting network devices are key functions.

Typical Wi-Fi home networks include wired connections to broadband service providers, access points, and wired and wireless computers (sometimes to other devices on the network). Many Wi-Fi networks are built in an "intrastructure mode", where the access point acts as a central hub for connecting devices with Wi-Fi connectivity. Each device can communicate indirectly through an access point, rather than through a direct connection. Wi-Fi Direct devices determine each other to act as APs when they first connect.

Similar to this Wi-Fi Direct technology, Bluetooth comes to mind first. Today, Bluetooth technology is often used to connect laptops, smartphones, mice or headsets without wires. Wi-Fi Direct has many advantages over Bluetooth. While the latest Bluetooth specification, Bluetooth 4.0, provides a distance of up to 100m, Wi-Fi can connect directly to devices within 200m without wires. Data transfer rates are up to 300Mbps, compared to 24Mbps for Bluetooth 4.0. Security supports WPA2 and is fully compatible with 802.11a / b / g / n networks. Security and transmission speeds are the same as the existing Wi-Fi network, but they add the ability to connect devices directly.

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. Not all devices that support Wi-Fi Direct provide a one-to-many connection.

Wi-Fi Direct is easy to upgrade. You can easily add Wi-Fi Direct to your existing Wi-Fi network without having to tear the device apart or add parts.

As of 2010, 700 million people, one-tenth of the world's population, use Wi-Fi. Most mobile devices that support the Internet have Wi-Fi technology. These days, Wi-Fi technology is being embraced beyond laptops, smartphones and tablet PCs to cars, TVs, medical devices and military equipment. It is only a matter of time before these devices support Wi-Fi Direct technology as a firmware upgrade.

Connecting your device from Wi-Fi Direct is simple. If you have a device that supports Wi-Fi Direct, it will automatically notify you. When you request a connection with an external device, the message is delivered in a `` push '' manner, and if the external device accepts it, you can connect and enjoy communication. You don't need a fresh line or an internet network. The Wi-Fi Protected Setup protocol makes it easy to connect two devices.

However, in such a Wi-Fi Direct technology, there is no specific proposal regarding a method of forming a specific group between devices and efficiently communicating by determining a group owner from the formed group. Applicant's prior art information related to this patent application is Korean Patent Application No. 10-2002-0083986 (published: July 28, 2004).

An object of the present invention is to provide a method for a first device belonging to a specific group to perform communication using Wi-Fi Direct.

Another object of the present invention is to provide a device belonging to a specific group and performing communication using Wi-Fi Direct.

Another object of the present invention is to provide a computer-readable recording medium having recorded thereon a program for executing a communication method using a Wi-Fi direct on a computer.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

In order to achieve the above technical problem, a method in which a first device belonging to a specific group according to the present invention performs communication by using Wi-Fi Direct, the second device from the second device belonging to the specific group Receiving a message comprising a first group owner intent value of the group owner intent value; And determining whether the first device is a group owner of the specific group based on the received first group owner intent value of the second device and the first group owner intent value of the first device. can do.

Determining whether or not the group owner comprises: comparing a first group owner intent value of the second device with a first group owner intent value of the first device; And when the group first group owner intent value of the first device is greater than the first group owner intent value of the second device, determining the first device as the group owner of the specific group. . Alternatively, the determining of whether the group is owner may include comparing a first group owner intent value of the second device with a first group owner intent value of the first device; And if the first group owner intent value of the first device is less than the first group owner intent value of the second device, determining the first device as a group client of the specific group. can do.

The method may maintain the first group owner intent value of the first device when the received first group owner intent value of the second device is equal to the first group owner intent value of the first device. The method may further include receiving a second group owner intent value from the second device. In this case, comparing the received second group owner intent value of the second device and the first group owner intent value of the first device; And if the first group owner intent value of the first device is greater than the second group owner intent value of the second device, determining the first device as the group owner of the specific group. . Determining the second group owner intent value of the first device when the second group owner intent value of the second device and the first group owner intent value of the first device are the same. The second group owner intent value of the first device may be determined by subtracting a value calculated according to a predefined expression from the first group owner intent value of the first device. Comparing the determined second group owner intent value of the first device with the second group owner intent value of the second device; And if the second group owner intent value of the first device is greater than the second group owner intent value of the second device, determining the first device as the group owner of the specific group. Or comparing the determined second group owner intent value of the first device with the second group owner intent value of the second device; And if the second group owner intent value of the first device is less than the second group owner intent value of the second device, determining the first device as a group client of the specific group. can do. Or, when the second group owner intent value of the first device is equal to the second group owner intent value of the second device, determining the third group owner intent value of the first device. In this case, the third group owner intent value of the first device may be determined by subtracting a value calculated according to the predefined formula from the second group owner intent value of the first device. The method may further include determining the first device as the group owner of the specific group when the determined third group owner intent value of the first device is greater than the second group owner intent value of the second device. Can be.

Meanwhile, the method may further include transmitting a message including the group owner intent value of the first device to the second device. The predefined formula may be an expression of dividing a randomly selected value by 3 to obtain a remaining value. Also, in the method, the message including the first group owner intent value of the second device may be a message for requesting group owner negotiation. The group owner intent value may be any one of an integer from 1 to 15.

In the determining of whether the group is the group owner of the method, when the first device is determined to be the group owner of the specific group, forwarding the data received from the base station to the second device by the first device; It may further include.

In order to achieve the above another technical problem, a first device belonging to a specific group according to the present invention and performing communication by using Wi-Fi Direct includes: from a second device belonging to the specific group; A receiver for receiving a message comprising a first group owner intent value; And a processor configured to determine whether the first device is a group owner of the specific group based on the received first group owner intent value of the second device and the first group owner intent value of the first device. can do.

The processor compares the first group owner intent value of the second device with the first group owner intent value of the first device to determine whether or not it is a group owner, and the group first group owner of the first device. If the intent value is greater than the first group owner intent value of the second device, the first device may be determined as the group owner of the specific group. On the other hand, the processor compares the first group owner intent value of the second device with the first group owner intent value of the first device to determine whether it is a group owner, and the first group of the first device. If the owner intent value is smaller than the first group owner intent value of the second device, the first device may be determined as a group client of the specific group. The processor may maintain the first group owner intent value of the first device when the received first group owner intent value of the second device and the first group owner intent value of the first device are the same. The receiver may receive a second group owner intent value from a second device.

The processor compares the received second group owner intent value of the second device with the first group owner intent value of the first device, and wherein the first group owner intent value of the first device is equal to the second group owner intent value. If the device is greater than the second group owner intent value of the device, the first device may be determined as the group owner of the specific group, and the second group owner intent value of the received second device and the first group of the first device are determined. If the owner intent value is the same, the processor determines the second group owner intent value of the first device, but the second group owner intent value of the first device is the first group owner intent of the first device. The tent value can be determined by subtracting the value calculated according to a predefined equation. The processor compares the determined second group owner intent value of the first device with the second group owner intent value of the second device, and wherein the second group owner intent value of the first device is equal to the second device. If greater than the second group owner intent value of the first device may be determined to be the group owner of the particular group. The processor compares the determined second group owner intent value of the first device with the second group owner intent value of the second device, and wherein the second group owner intent value of the first device is equal to the second device. If less than the second group owner intent value of the first device may be determined to be a group client of the particular group. If the second group owner intent value of the first device is equal to the second group owner intent value of the second device, the processor determines a third group owner intent value of the first device, The third group owner intent value of the first device may be determined as a value obtained by subtracting a value calculated according to the previously defined formula from the second group owner intent value of the first device. The processor may determine the first device as the group owner of the specific group when the determined third group owner intent value of the first device is greater than the second group owner intent value of the second device.

The first device may further include a transmitter for transmitting a message including a group owner intent value of the first device to the second device. The predefined formula may be an expression of dividing a randomly selected value by 3 to obtain a remaining value. The message including the first group owner intent value of the second device may be a message for requesting group owner negotiation. The group owner intent value may be any one of an integer from 1 to 15. When the first device is determined to be the group owner of the specific group, the first device may further include a transmitter for forwarding data received from the base station to the second device.

According to the method of determining a group owner in a Wi-Fi direct network according to the present invention, it is possible to reduce battery consumption of clients compared to a conventional Wi-Fi infrastructure connection.

In addition, as an example of application, Wi-Fi Direct may be applied to Wi-Fi 100 and the wired network may be serviced with a small amount of battery reduction compared to the existing.

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.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide an embodiment of the present invention and together with the description, illustrate the technical idea of the present invention.
FIG. 1 is a block diagram showing the configuration of a transmitting side (transmitting device) 105 and a receiving side (receiving device) 110 in a wireless communication system 100 using Wi-Fi Direct technology.
2A and 2B are diagrams illustrating a configuration of a Wi-Fi direct network.
3A and 3B are diagrams illustrating still another example of a configuration of a Wi-Fi direct network.
4 is a diagram illustrating a group owner negotiation process between devices when a connection using Wi-Fi Direct is performed.
5 is a flowchart illustrating a preferred embodiment of a method for determining a group owner for performing communication using Wi-Fi Direct according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate 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, the same components will be described with the same reference numerals throughout the present specification.

In the following description, it is assumed that the UE collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment), an MS (Mobile Station), and an AMS (Advanced Mobile Station). 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).

In a mobile communication system, a terminal may receive information from a base station through downlink, and the terminal may also transmit information through uplink. The information transmitted or received by the terminal includes data and various control information, and various physical channels exist depending on the type of information transmitted or received by the terminal.

FIG. 1 is a block diagram showing the configuration of a transmitting side (transmitting device) 105 and a receiving side (receiving device) 110 in a wireless communication system 100 using Wi-Fi Direct technology.

Although one transmitting side 105 and one receiving side 110 are shown to simplify the wireless communication system 100, the wireless communication system 100 may include one or more base stations and / or one or more terminals. Can be.

Referring to FIG. 1, the transmitter 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver. 190, symbol demodulator 195, and receive data processor 197. In addition, the receiving side 110 includes a transmit (Tx) data processor 165, a symbol modulator 175, a transmitter 175, a transmit / receive antenna 135, a processor 155, a memory 160, a receiver 140, And a symbol demodulator 155 and a receive data processor 150. Although the transmitting and receiving antennas 130 and 135 are shown as one on the transmitting side 105 and the receiving side 110, respectively, the transmitting side 105 and the receiving side 110 are provided with a plurality of transmitting and receiving antennas. Therefore, the transmitting side 105 and the receiving side 110 according to the present invention supports a multiple input multiple output (MIMO) system. In addition, the transmitter 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.

On the downlink, the transmit data processor 115 receives traffic data, formats, codes, and interleaves and modulates (or symbol maps) the coded traffic data to generate modulation symbols Symbols "). A symbol modulator 120 receives and processes the data symbols and pilot symbols to provide a stream of symbols.

The symbol modulator 120 multiplexes the data and pilot symbols and transmits it to the transmitter 125. In this case, each transmission symbol may be a data symbol, a pilot symbol, or a null signal value. In each symbol period, the pilot symbols may be transmitted 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 125 receives a 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 downlink signal suitable for transmission over a wireless channel is generated, and then the transmitting antenna 130 transmits the generated downlink signal to the terminal.

In the configuration of the receiving side 110, the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140. The receiver 140 adjusts (e.g., filters, amplifies, and downconverts) the received signal and digitizes the conditioned signal to obtain samples. The symbol demodulator 145 demodulates the received pilot symbols and provides it to the processor 155 for channel estimation.

Symbol demodulator 145 also receives a frequency response estimate for the downlink from processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is estimates of the transmitted data symbols) And provides data symbol estimates to a receive (Rx) data processor 150. [ The receive data processor 150 demodulates (i.e., symbol demaps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.

The processing by the symbol demodulator 145 and the receiving data processor 150 is complementary to the processing by the symbol modulator 120 and the transmitting data processor 115 at the transmitting side 105, respectively.

Receiving side 110 is on the uplink, and transmit data processor 165 processes the traffic data to provide data symbols. The symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175. A transmitter 175 receives and processes the stream of symbols to generate an uplink signal. The transmit antenna 135 transmits the generated uplink signal to the transmitting side 105.

At the transmitting side 105, an uplink signal from the receiving side 110 is received through the receiving antenna 130, and the receiver 190 processes the received uplink signal to obtain samples. The symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink. The receive data processor 197 processes the data symbol estimates to recover the traffic data sent from the receiver 110.

The processor 155 of the receiving side 110 and the processor 180 of the transmitting side 105 instruct (eg, control, adjust, manage, etc.) operations at the receiving side 110 and the transmitting side 105, respectively. )do. Respective processors 155 and 180 may be connected to memories 160 and 185 that store program codes and data. The memory 160, 185 is coupled to the processor 155, 180 to store operating systems, applications, and general files.

The processors 155 and 180 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like. Meanwhile, the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof. (DSP), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and the like may be used to implement embodiments of the present invention using hardware, , FPGAs (field programmable gate arrays), and the like may be provided in the processors 155 and 180.

Meanwhile, when implementing embodiments of the present invention using firmware or software, firmware or software may be configured to include modules, procedures, or functions that perform the functions or operations of the present invention. Firmware or software configured to be stored in the memory 155 may be contained within the processor 155 or 180 or may be stored in the memory 160 or 185 and be driven by the processor 155 or 180. [

The layers of the air interface protocol between the receiving side 110 and the transmitting side 105 between the wireless communication system (network) are based on the first three layers based on the lower three layers of the open system interconnection (OSI) model, which is well known in communication systems. L1), a second layer L2, and a third layer L3. The physical layer belongs to the first layer and provides an information transmission service through a physical channel. An RRC (Radio Resource Control) layer belongs to the third layer and provides control radio resources between the UE and the network. The receiving side and the transmitting side may exchange RRC messages via the wireless communication network and the RRC layer.

The WiFi Alliance (WFA) has proposed a new standard, Wi-Fi Direct, that supports peer-to-peer between WiFi. Currently, Wi-Fi is a wireless communication technology widely used worldwide under the IEEE 802.11 standard and 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. The WLAN technology is similar to Ad-hoc, but there is a difference between Ad-hoc that supports connection between Wi-Fi devices.

The infrastructure mode, Ad-hoc, is used only for simple connections between notebook Wi-Fis in a short distance, and mainly for sharing the Internet connected to a single computer. The speed is also limited to 11Mbps. Wi-Fi Direct supports the speed of current IEEE 802.11n. In addition, Wi-Fi Direct supports wireless security technology that ad-hoc mode doesn't support, so it can be used for enterprise use. Wi-Fi Direct will support the latest wireless security technologies, WPA2 and WPS.

As such, Wi-Fi Direct is a kind of soft-AP protocol beyond ad-hoc. Like the AP feature, Wi-Fi connectivity is more flexible. Wi-Fi Direct is able to send and receive files to and from Wi-Fi Direct without the need for a special network between smartphones and cameras and between cameras and printers. The concept of Bluetooth and technology is similar in that devices can be directly connected and exchanged data without going through an AP.

Comparing Wi-Fi and Bluetooth alone, Wi-Fi can communicate over long distances (several meters to hundreds of meters), while Bluetooth typically only supports short distances within 10 meters (Class 2). The speed is incomparably faster than Wi-Fi. IEEE 802.11n systems can theoretically reach 300 Mbps (actually 150 Mbps), while Bluetooth has a maximum of 3 Mbps.

Bluetooth is mainly used for audio transmission or small size data wireless transmission because of its low power consumption, and Wi-Fi is relatively easy to transmit complex data such as the Internet and use complex protocols. It is becoming. With the rapid proliferation of mobile devices, Wi-Fi is also increasing. Apart from being built only in computing devices such as laptops and PDAs, some home appliances such as smartphones, MP3Ps, mobile game consoles, home console game consoles, cameras, and printers, set-top boxes, even keyboards and mice are also coming out of Wi-Fi-enabled products. Although Wi-Fi devices have been increasing, most of them are used only for Internet connection and little consideration has been given to communication between Wi-Fi embedded devices. Most of these markets have used Bluetooth, a low-power near field communication. Bluetooth has become popular as a method of communication between devices, regardless of Wi-Fi, and has been used only for the transmission of relatively small content such as audio transmissions, address book or photo transfers of mobile phones, and interconnection of mobile game machines.

Wi-Fi Direct has become one of Bluetooth's alternative powerful communication technologies, overcoming the distance and speed issues noted by Bluetooth. However, the weakness is that Wi-Fi's power consumption is incomparably high compared to Bluetooth because it needs to support long distance and support higher speed than Bluetooth. Wi-Fi power consumption in most mobile devices is a sensitive issue. In addition, the Bluetooth camp is trying to make it faster by entering the 802.11 standard, and future versions have promised to switch from the current unicast to broadcast, and to improve QoS.

In order to use Wi-Fi Direct, the existing Wi-Fi components require firmware updates. Some older Wi-Fi parts may not be possible, but recent devices are expected to support Wi-Fi Direct with firmware updates. The spread of Wi-Fi Direct technology will make it easier to transfer files and network between mobile devices.

In the following specification, a method of improving power efficiency of devices having limited power capacity through a home network configuration using Wi-Fi Direct technology having various advantages will be described.

The current home network is configured through a home gateway. Since the home gateway only forwards packets from the external network, QoS must be performed at the client terminal, which causes a lot of power consumption. In addition, terminals are rapidly increasing battery consumption due to advanced hardware.

Wi-Fi Direct provides an owner device with connectivity to other client devices and ensures connectivity to devices that don't use Wi-Fi Direct. The disadvantage of Wi-Fi Direct technology is that the device designated as the owner acts as an AP, which increases the battery consumption of the owner device considerably, while the general devices connected to the owner device include basic QoS. Compared to infrastructure mode, battery consumption of a typical Wi-Fi Direct client device can be significantly reduced.

In the construction of a general home network, a basic device is a device that receives power such as a Wi-Fi AP and a home gate. However, Wi-Fi Direct does not consider the configuration of inserting Wi-Fi Direct into a conventionally powered device, and as a result, some of the devices designated as owners are designed to endure excessive battery consumption. Therefore, it is assumed that the device determined as the group owner in the present invention has a constant power supply.

According to the present invention, a Wi-Fi direct owner device is configured by assigning a terminal having a continuous power supply that provides a data to a client terminal (client device) by forming a home network using Wi-Fi Direct technology and processing data to the client terminal (client device). It can overcome the excessive power consumption of. In addition, it is possible to increase the power efficiency of the general terminal having a limited power capacity. To this end, a method of determining an owner and a client device among devices belonging to a specific group using Wi-Fi Direct will be described below.

2A and 2B are diagrams illustrating a configuration of a Wi-Fi direct network.

Referring to FIG. 2A, one group owner device (eg, P2P group owner device) 210 and a client device (eg, P2P client device) 220 are connected through Wi-Fi Direct. In this case, it represents a 1: 1 P2P group. Referring to FIG. 2B, one group owner device (eg, P2P group owner device) 230 is connected to a client device (eg, P2P client device) 240 and 250, a legacy client device 260, and a Wi-Fi. It is connected via direct. In this case, it represents a 1: n P2P group. In the connection through Wi-Fi Direct, as shown in FIGS. 2A and 2B, one of the two devices becomes the group owner device and the remaining devices become the client device. In addition, in FIG. 2B, legacy devices (eg, devices operating in the existing Wi-Fi intrastructure mode) may also be compatible with the Wi-Fi direct network.

In the Wi-Fi direct network, P2P devices may be configured into a specific group, and may be classified into a group owner device and a client device in a specific group. This classification into a group owner device and a client device is determined by negotiation between devices belonging to a specific group, which will be described in detail with reference to FIG. 3.

As shown in FIG. 1, when a device powered by a battery becomes a group owner instead of a terminal that is powered by a wire such as an AP or a set-top box (STB), the AP plays a role of an AP, causing extreme battery consumption. Let's do it. Therefore, it is necessary to be set so that the always-powered device becomes the group owner. In order to reduce the battery consumption of a device that consumes battery, the device owner such as an AP or a set-top box (STB) is a group owner.

3A and 3B are diagrams illustrating still another example of a configuration of a Wi-Fi direct network. When connecting using Wi-Fi Direct, the algorithm and method described below can be applied to an AP or set-top box (STB) supporting Wi-Fi Direct so as to have a network configuration as shown in FIGS. 3A and 3B. To be assigned.

4 is a diagram illustrating a group owner negotiation process between devices when a connection using Wi-Fi Direct is performed.

Referring to FIG. 4, it is assumed that the first device (eg, the first P2P device) is the receiving side 105 and the second device (eg, the second P2P device) is the transmitting side 110. do. It is also assumed that the first and second devices 110, 105 belong to the same specific group. In this specification, the group owner intent value is an integer value between 1 and 15, and it is assumed that a device having a larger group owner intent value becomes a group owner.

The receiver 140 of the first device 105 receives a negotiation request message including the first group owner intent value of the second device from the second device 110 belonging to the specific group. It may be received (S410).

In this case, the negotiation request message of the second device 110 may be a message for negotiating to determine the group owner. The transmitter 175 of the first device 105 may transmit a response message including its group owner intent value to the second device 110 in response to the negotiation request of the second device 110 (S420). ). Thereafter, the receiver 140 of the first device 105 may receive a message confirming negotiation from the second device 110 (S430). Hereinafter, contents for determining a group owner between devices belonging to a specific group in a network using Wi-Fi Direct will be described.

The processor 155 of the first device 105 may assign or determine the first group owner intent value. The receiver 140 of the first device 105 includes a negotiation request message including a first group owner intent value of the second device 110 from the second device 110 belonging to the specific group. Can be received. Then, the processor 155 of the first device 105 determines the first group owner intent value of the second device 110 and the first group owner intent value of the first device 105 received by the receiver 140. Based on the determination of which of the first device 105 and the second device 110 to be the group owner of the particular group.

In this case, the processor 155 of the first device 105 determines the first group owner intent value of the second device 110 and its own to determine whether the first device 105 that is itself is the group owner. Compare the first group owner intent value, and if the first group owner intent value of the first device 105 is greater than the first group owner intent value of the second device 110, the first device 105 is recalled. You can decide to be the group owner of a particular group.

In contrast, if the first group owner intent value of the first device 105 is smaller than the first group owner intent value of the second device 110, the processor 155 of the first device 105 may be configured to be the first. The device 105 may be determined to be a group client of the particular group. On the other hand, when the received first group owner intent value of the second device 110 and the first group owner intent value of the first device 105 are the same (for example, the first of the second device 110). When both the group owner intent value and the first group owner intent value of the first device 105 are 15), the processor 155 of the first device 105 has its own first group owner intent value. (For example, the first group owner intent value is kept at 15 as it is).

Thereafter, the receiver 140 of the first device 105 may receive the group owner intent value from the second device 110 again. At this time, the group owner intent value of the second device 110 received again is defined as the second group owner intent value of the second device 110 and used. Then, the processor 155 of the first device 105 compares the received second group owner intent value of the second device 110 with the first group owner intent value of the first device 105, When the first group owner intent value of the first device 105 is greater than the second group owner intent value of the second device 110, the first device 105 may be determined as the group owner of the specific group. .

In contrast, when the received second group owner intent value of the second device 110 and the first group owner intent value of the first device are the same (for example, a maintained group of the first device 105). If both the owner intent value and the second group owner intent value of the second device 110 are 15), the processor 155 of the first device 105 causes the group owner intent of the first device 105 to be the same. You can assign a new value. Here, the second newly assigned group owner intent value is defined as the second group owner intent value of the first device 105. The processor 155 of the first device 105 subtracts a value obtained by subtracting a value calculated according to a predefined expression from the first group owner intent value of the first device 105. It can be determined by the 2 group owner intent value. In this case, as an example of a predefined formula, Equation 1 below is used.

[Equation 1]

Random_value% 3

Equation 1, which is a predefined equation, represents a remainder obtained by dividing a randomly selected value (for example, a randomly selected value from 1 to 15) by three. Therefore, when the randomly selected value is 10, the value calculated according to Equation 1 is 1. The processor 155 of the first device 105 allocates 14 corresponding to the value obtained by subtracting the value 1 calculated according to Equation 1 from the group owner intent value 15 held as the second group owner intent value. (Or decide). In this case, the processor 155 of the first device 105 increases the number of counts by one and stores the count.

As such, the processor 155 of the first device 105 compares the determined second group owner intent value of the first device 105 with the second group owner intent value of the second device 110, and When the second group owner intent value of the first device 105 is smaller than the second group owner intent value of the second device, the first device 105 may be determined as a group client of the specific group.

In contrast, if the second group owner intent value of the first device 105 is greater than the second group owner intent value of the second device 110, the processor 155 of the first device 105 is configured to be the first device. May be determined to be the group owner of the specific group.

If the second group owner intent value of the first device 105 is the same as the second group owner intent value of the second device 110, the processor 155 of the first device 105 may have a first value. The third group owner intent value of the device 105 may be assigned (or determined). In this case, the third group owner intent value of the first device 105 is a value obtained by subtracting a value calculated according to Equation 1, which is a predefined expression, from the second group owner intent value of the first device 105. Can be determined.

Similarly, the processor 155 of the first device 105 compares the determined third group owner intent value of the first device 105 with the second group owner intent value of the second device 110 to determine who the above is. You can decide whether to be the group owner of a particular group. If the determined third group owner intent value of the first device 105 is different from the second group owner intent value of the second device 110, the third group owner intent value of the first device 105 is determined. And a device having a larger value among the second group owner intent value of the second device 110 is determined as the group owner of the specific group. Alternatively, if the third group owner intent value of the first device 105 and the second group owner intent value of the second device 110 are the same, the processor of the first device 105 adds a count by one more. The fourth group owner intent value may be increased based on Equation 1 and the third group owner intent value. That is, the processor 155 of the first device 105 subtracts any selected value calculated according to Equation 1 from the third group owner intent value of the first device 105. The fourth group owner intent value of the device 105 may be determined.

The processor 155 of the first device 105 previously uses the equation 1 until the group owner intent value of the first device 105 is different from the group owner intent value of the second device 110. A process of determining a new group owner intent value may be repeatedly performed a predetermined number of times (for example, count 3). In addition, even if the second device 110 fails to connect with the first device 105, it is necessary to retry the connection up to a predetermined number of times (for example, up to three times).

In the foregoing description, the processor 155 of the first device 105 determines that the group owner of the specific group is determined. However, as shown in FIG. 3, each of the devices 105 and 110 assigns the group owner intent value to each other. After transmitting, each device 105 or 110 may assign or determine itself as a group owner or a group client according to the above-described rules.

As such, the Wi-Fi Direct interface forms a group to establish a connection, and the role of the Group Owner / Client is assigned to each device to which the Wi-Fi Direct interface is connected. The group owner device and the group client device are determined by comparing the group owner intent value during the connection process.

5 is a flowchart illustrating a preferred embodiment of a method for determining a group owner for performing communication using Wi-Fi Direct according to the present invention.

Referring to FIG. 5, the processor 155 of the first device 105 may allocate or determine the group owner intent value (eg, the largest value 15) of the first device 105 (S510). . Then, the receiver 140 of the first device 105 includes the first group owner intent value of the second device 110 from the second device 110 belonging to the same group as itself. The negotiation request message may be received (S520).

Then, the processor 155 of the first device 105 determines the first group owner intent value of the second device 110 and the first group owner intent value of the first device 105 received by the receiver 140. It may be compared (S530). If the processor 155 of the first device 105 determines that the received first group owner intent value of the second device 110 is greater than the first group owner intent value of the first device 105 (S530). The first device 105 may be assigned as a group client. In contrast, if it is determined that the first group owner intent value of the first device 105 is greater than the first group owner intent value of the second device 110 (S530), the first device 105 is the group owner. It may be determined (S535). As shown in FIG. 5, when the group owner intent value of the first device 105 is assigned to the maximum value of 15, the first group owner intent value of the first device 105 (that is, 15). And the first group owner intent value of the second device 110 is not equal to the first group owner intent value of the first device 105, the first device 105 is determined to be the group owner of the group. (S535). However, if the first group owner intent value of the second device 110 and the first group owner intent value of the first device 105 are equal to 15 (S530), the processor 155 of the first device 105 is the same. ) May assign the first group owner intent value of the first device 105 to the same value again (for example, 15) (S535).

In order to maintain the group owner intent value, the first device 105 may be allocated to 15 again (S535), and may be transmitted to the second device 110, although not shown in FIG. 5. The receiver 140 of the first device 105 may receive the group owner intent value from the second device 110 again (S540). At this time, the group owner intent value of the second device received by the first device 105 is defined as a second group owner intent value, and it is determined whether the value is less than 15 (S545). Then, the processor 155 of the first device 105 compares the received second group owner intent value of the second device 110 with the first group owner intent value of the first device 105 (S545). ), When the first group owner intent value of the first device 105 is greater than the second group owner intent value of the second device 110, the first device 105 may be determined as the group owner of the specific group. (S550).

For example, when the first group owner intent value of the first device 105 is maintained at 15, if the second group owner intent value of the second device 110 is not 15, the first device 105 is. The processor 155 may determine the first device 105 as the group owner (S550). In contrast, when the received second group owner intent value of the second device 110 and the first group owner intent value of the first device are the same (for example, a maintained group of the first device 105). If both the owner intent value and the second group owner intent value of the second device 110 are 15 (S545), the processor 155 of the first device 105 is assigned to the group of the first device 105. The owner intent value may be newly assigned (S550). Here, the second group owner intent value newly assigned in this manner is defined as the second group owner intent value of the first device 105.

In more detail operation S550, the processor 155 of the first device 105 may subtract the value calculated according to Equation 1 from the first group owner intent value of the first device 105. The second device owner intent value of the first device 105 may be determined (S550). Equation 1 represents a remaining value obtained by dividing a randomly selected value (for example, a randomly selected value from 1 to 15) by three. Therefore, when the value arbitrarily selected is 10, the value calculated according to Equation 1 is 1, and the processor 155 of the first device 105 maintains the group owner intent value 15 according to Equation 1 above. 14 corresponding to the calculated value 1 may be allocated (or determined) to the second group owner intent value (S550). At this time, the processor 155 of the first device 105 increases the number of counts by one and stores the counted number (S550).

As such, the processor 155 of the first device 105 compares the determined second group owner intent value of the first device 105 with the second group owner intent value of the second device 110, and If the second group owner intent value of the first device 105 is smaller than the second group owner intent value of the second device (S555), the processor 155 of the first device 105 may execute the first device 105. ) May be determined as a group client of the specific group (S560). On the contrary, when the second group owner intent value of the first device 105 is the same as the second group owner intent value of the second device 110 (S555), the processor 155 of the first device 105 is provided. ) May return to step S550 to allocate (or determine) the third group owner intent value of the first device 105 (S550). In this case, the third group owner intent value of the first device 105 is a value obtained by subtracting a value calculated according to Equation 1, which is a predefined expression, from the second group owner intent value of the first device 105. It may be determined as (S550).

Similarly, the processor 155 of the first device 105 compares the determined third group owner intent value of the first device 105 with the second group owner intent value of the second device 110 to determine who the above is. You can decide whether to be the group owner of a particular group. If the determined third group owner intent value of the first device 105 is different from the second group owner intent value of the second device 110, the third group owner intent value of the first device 105 is determined. The device having the larger value of the second group owner intent value of the second device 110 is determined as the group owner of the specific group (S560). Alternatively, if the third group owner intent value of the first device 105 and the second group owner intent value of the second device 110 are the same, the processor of the first device 105 adds a count by one more. In step S555, the method returns to step S550 to determine the fourth group owner intent value of the first device 105 based on Equation 1 and the third group owner intent value (S550). That is, the processor 155 of the first device 105 subtracts any selected value calculated according to Equation 1 from the third group owner intent value of the first device 105. The fourth group owner intent value of the device 105 may be determined (S550).

The processor 155 of the first device 105 previously uses the equation 1 until the group owner intent value of the first device 105 is different from the group owner intent value of the second device 110. A process of determining a new group owner intent value may be repeatedly performed a predetermined number of times (for example, count 3).

Although it has been described that the processor 155 of the first device 105 determines the group owner of a specific group, as shown in FIG. 3, each device 105, 110 transmits the group owner intent value to each other and The devices 105 and 110 may assign or determine themselves as group owners or group clients according to the above-described rules.

According to the method of determining the group owner in the Wi-Fi direct network as described above, it reduces the battery consumption of clients compared to the existing Wi-Fi Infrastructure connection. As an example of application, Wi-Fi Direct may be applied to the Wi-Fi 100 and the wired network may be serviced with a small amount of battery reduction compared to the conventional.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (31)

In a method in which a first device belonging to a specific group performs communication using Wi-Fi Direct,
Receiving a message including a first group owner intent value of the second device from a second device belonging to the specific group; And
Determining whether the first device is a group owner of the specific group based on the received first group owner intent value of the second device and the first group owner intent value of the first device. Method of performing communication using Wi-Fi Direct, characterized in that. The method of claim 1,
Determining whether or not the group owner,
Comparing the first group owner intent value of the second device with the first group owner intent value of the first device; And
Determining the first device as the group owner of the specific group if the group first group owner intent value of the first device is greater than the first group owner intent value of the second device. How to perform communication using Wi-Fi Direct. The method of claim 1,
Determining whether or not the group owner,
Comparing the first group owner intent value of the second device with the first group owner intent value of the first device; And
Determining the first device as a group client of the specific group if the first group owner intent value of the first device is less than the first group owner intent value of the second device. Method of performing communication using Wi-Fi Direct, characterized in that. The method of claim 1,
If the received first group owner intent value of the second device and the first group owner intent value of the first device are the same, the first group owner intent value of the first device is maintained,
And receiving a second group owner intent value from the second device. 5. The method of claim 4,
Comparing the received second group owner intent value of the second device with the first group owner intent value of the first device; And
And if the first group owner intent value of the first device is greater than the second group owner intent value of the second device, determining the first device as the group owner of the specific group. How to perform communication using Wi-Fi Direct. 5. The method of claim 4,
When the received second group owner intent value of the second device and the first group owner intent value of the first device are the same,
Determining a second group owner intent value of the first device;
The second group owner intent value of the first device is determined by subtracting a value calculated according to a predefined formula from the first group owner intent value of the first device. Method of performing communication using. The method according to claim 6,
Comparing the determined second group owner intent value of the first device with the second group owner intent value of the second device; And
Determining the first device as the group owner of the specific group if the second group owner intent value of the first device is greater than the second group owner intent value of the second device. How to perform communication using Wi-Fi Direct. The method according to claim 6,
Comparing the determined second group owner intent value of the first device with the second group owner intent value of the second device; And
Determining the first device as a group client of the particular group if the second group owner intent value of the first device is less than the second group owner intent value of the second device. Method of performing communication using Wi-Fi Direct, characterized in that. The method according to claim 6,
If the second group owner intent value of the first device is equal to the second group owner intent value of the second device,
Determining a third group owner intent value of the first device;
The third group owner intent value of the first device is determined by subtracting a value calculated according to the predefined formula from the second group owner intent value of the first device. Method of performing communication using. The method of claim 9,
Determining the first device as the group owner of the particular group if the determined third group owner intent value of the first device is greater than the second group owner intent value of the second device. Method of performing communication using Wi-Fi Direct. The method of claim 1,
And transmitting a message including the group owner intent value of the first device to the second device. The method according to claim 6,
The predefined expression is a method of performing a communication using Wi-Fi Direct, characterized in that to obtain the remaining value by dividing the arbitrarily selected value by three. The method of claim 1,
And a message including a first group owner intent value of the second device is a message for requesting group owner negotiation. The method of claim 1,
And the group owner intent value is any one of an integer from 1 to 15. The method according to any one of claims 1, 2, 5 and 7,
If the first device is determined to be the group owner of the specific group in the step of determining whether to be the group owner,
And forwarding data received from a base station to the second device. A first device belonging to a specific group and performing communication using Wi-Fi Direct,
A receiver for receiving a message including a first group owner intent value of the second device from a second device belonging to the specific group; And
And a processor configured to determine whether the first device is a group owner of the specific group based on the received first group owner intent value of the second device and the first group owner intent value of the first device. A first device, characterized in that. 17. The method of claim 16,
The processor compares the first group owner intent value of the second device with the first group owner intent value of the first device to determine whether or not it is a group owner, and the group first group owner of the first device. And if the intent value is greater than the first group owner intent value of the second device, determining the first device as the group owner of the specific group. 17. The method of claim 16,
The processor compares the first group owner intent value of the second device with the first group owner intent value of the first device to determine whether or not it is a group owner. And if the tent value is less than the first group owner intent value of the second device, determine the first device as a group client of the particular group. 17. The method of claim 16,
The processor maintains the first group owner intent value of the first device when the received first group owner intent value of the second device is equal to the first group owner intent value of the first device.
The receiver receiving a second group owner intent value from a second device. 20. The method of claim 19,
The processor compares the received second group owner intent value of the second device with the first group owner intent value of the first device, and wherein the first group owner intent value of the first device is equal to the second group owner intent value. And determining the first device as the group owner of the particular group if it is greater than the second group owner intent value of the device. 20. The method of claim 19,
When the received second group owner intent value of the second device and the first group owner intent value of the first device are the same,
The processor determines a second group owner intent value of the first device, wherein the second group owner intent value of the first device is defined in advance in the first group owner intent value of the first device. And a value calculated by subtracting the calculated value according to the first device. 22. The method of claim 21,
The processor compares the determined second group owner intent value of the first device with the second group owner intent value of the second device, and wherein the second group owner intent value of the first device is equal to the second device. And determine the first device as the group owner of the particular group if greater than the second group owner intent value of the first device. 22. The method of claim 21,
The processor compares the determined second group owner intent value of the first device with the second group owner intent value of the second device, and wherein the second group owner intent value of the first device is equal to the second device. And determine the first device as a group client of the particular group if less than the second group owner intent value of the first device. 22. The method of claim 21,
If the second group owner intent value of the first device is equal to the second group owner intent value of the second device,
The processor determines a third group owner intent value of the first device, wherein the third group owner intent value of the first device is defined in the previously defined second group owner intent value of the first device. The first apparatus which determines the value computed by the formula as the value deducted. 25. The method of claim 24,
Wherein the processor determines the first device as the group owner of the particular group if the determined third group owner intent value of the first device is greater than the second group owner intent value of the second device. . 17. The method of claim 16,
And a transmitter for transmitting a message including a group owner intent value of the first device to the second device. 22. The method of claim 21,
The predefined device is a first device, characterized in that to obtain the remaining value by dividing the arbitrarily selected value by three. 17. The method of claim 16,
And the message including the first group owner intent value of the second device is a message for requesting group owner negotiation. 17. The method of claim 16,
And the group owner intent value is any one of integers from 1 to 15. The method according to any one of claims 16, 17, 20 and 22,
If the first device is determined to be the group owner of the specific group,
And a transmitter for forwarding the data received from the base station to the second device. A computer-readable recording medium having recorded thereon a program for executing the communication method using Wi-Fi Direct according to any one of claims 1 to 14 on a computer.

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