KR20110087228A - Apparatus and method for waking device from power save mode - Google Patents

Abstract

PURPOSE: A method for waking up an apparatus from a power saving mode is provided to convert a state of an apparatus into an awake state. CONSTITUTION: A group owner of a persistent group periodically transmits a message beacon in a power saving mode(510). The group owner converts into an active state(540). The group owner transmits a response about the magic packet to the client(550). The client forms the group owner and the P2P group(560).

Description

Apparatus and method for waking device from power save mode}

The present invention relates to a method and apparatus for waking a device from a power save mode, and more particularly, to a method and apparatus for remotely waking a device in peer-to-peer communication.

Recently, Wi-Fi P2P (or Wi-Fi Direct; WFD) standards have been defined to support the connection between devices more conveniently than conventional Wi-Fi, and to transmit audio / video data while satisfying high quality and low latency. Wi-Fi Display standard is defined by the requirement. Since Wi-Fi P2P supports a power saving function different from conventional Wi-Fi, a technology for remotely waking a Wi-Fi P2P device in a power saving mode into an active mode is required.

The present invention provides a method and apparatus for remotely waking a device in P2P communication.

In order to solve the above technical problem, an embodiment of a method in which a first device according to the present invention switches a second device from a power save mode to an active mode is performed according to a predetermined period. Transmitting a magic packet to the second device operating in the power saving mode which repeats a doze state and an awake state, to notify the user of switching to the active mode through a predetermined channel; And if a response to the magic packet has not been received from the second device and a predetermined period has not elapsed after transmitting the magic packet through the predetermined channel, retransmit the magic packet through the predetermined channel. It includes a step.

Preferably, if a response to the magic packet has not been received from the second device and the predetermined period has elapsed since the first transmission of the magic packet through the predetermined channel, a channel different from the predetermined channel. The method may further include transmitting the magic packet through the packet.

Preferably, the predetermined time period is longer than the period during which the second device is in the dose state.

Preferably, the predetermined time period is the same as the predetermined period.

Preferably, the predetermined period is characterized in that the beacon interval.

Preferably, the predetermined channel includes a channel used when the first device has recently communicated with the second device.

Preferably, the predetermined channel is characterized in that it comprises a social channel (social channel).

The method may further include forming a peer-to-peer group with the second device when a response to the magic packet is received from the second device.

The forming of the P2P group may include forming a P2P group with the second device by using credentials stored in the first device.

Preferably, the first device is a peer to peer client, and the second device is a peer to peer group owner.

Preferably, the magic packet is a probe request frame, and the sixth bit or the sixth bit of the device capability bitmap field of the P2P capability subelement of the probe request frame The value of 7 bits is 1.

Preferably, the magic packet is a P2P public action frame, and the type value of the P2P public action frame is any one of 9 to 255.

Preferably, the magic packet is a P2P action frame, and a type value of the P2P action frame is any one of 4 to 255.

Preferably, the first device and the second device is characterized in that the Wi-Fi P2P device.

In order to solve the above technical problem, another embodiment of a method for converting a second device from a power save mode to an active mode by the first device according to the present invention may include the P2P and the second device. Forming and synchronizing a peer to peer group; And based on the synchronization, when the second device operating in the power saving mode repeating a doze state and an awake state is in the awake state, switch to the active mode. The notifying includes transmitting a magic packet to the second device.

Preferably, one of the first device and the second device is a peer to peer client, the other is a peer to peer group owner, and the second device is the awake. When in the state, the P2P group owner transmits a beacon to the P2P client.

Preferably, the first device is a P2P client, and the second device is a P2P group owner.

Advantageously, transmitting the magic packet comprises transmitting the magic packet to the second device after receiving a beacon from the second device when the second device is in the awake state. Characterized in that.

The transmitting of the magic packet may include transmitting the magic packet in a client traffic window (CTWindow).

In order to solve the above technical problem, an embodiment of a method in which a second device communicating with a first device according to the present invention switches from a power save mode to an active mode is a doze state. receiving a magic packet from the first device informing the switch to the active mode when the second device operating in the power saving mode that repeats a state and an awake state is in the awake state. step; And switching to the active mode according to the reception of the magic packet.

The receiving of the magic packet may include receiving the magic packet in a state in which it is not synchronized with the first device.

The method may further include forming a peer to peer group with the first device after switching to the active mode.

The forming of the P2P group may include forming a P2P group with the first device by using credentials stored in the second device.

Preferably, the method may further include forming and synchronizing a peer-to-peer group with the first device, and receiving the magic packet may be based on the synchronization. When in the wake state, the magic packet is received from the first device.

Preferably, the first device is a peer to peer client, and the second device is a peer to peer group owner.

Advantageously, receiving the magic packet comprises receiving the magic packet from the first device after transmitting a beacon to the first device when the second device is in the awake state. Characterized in that.

In order to solve the above technical problem, an embodiment of a device for switching a peer device from a power save mode to an active mode according to the present invention may be in a doze state according to a predetermined period. a transmitting unit for transmitting a magic packet notifying a switch to the active mode, through a predetermined channel, to a counterpart device operating in the power saving mode which repeats a doze state and an awake state; And a receiver configured to receive a response to the magic packet from the counterpart device, wherein the transmitter is configured to transmit the magic packet through the predetermined channel without receiving a response to the magic packet from the counterpart device. After the predetermined period has not elapsed, the magic packet is retransmitted through the predetermined channel.

In order to solve the above technical problem, another embodiment of a device for switching a peer device from a power save mode to an active mode may include the peer device and a P2P group ( a synchronization unit for forming and synchronizing peer to peer group); And when the counterpart device operating in the power saving mode repeating a doze state and an awake state is in the awake state, based on the synchronization, informing the user to switch to the active mode. And a transmitting unit for transmitting the magic packet to the external device.

In order to solve the above technical problem, an embodiment of a device for switching from a power save mode to an active mode according to the present invention includes a doze state and an awake state. A receiving unit which receives a magic packet informing that the device is to be switched to the active mode when the device operating in the power saving mode to repeat the operation is in the awake state; And a switching unit for switching to the active mode according to the reception of the magic packet.

In order to solve the above technical problem, an embodiment of a probe request frame of a Wi-Fi peer-to-peer (P2P) standard according to the present invention includes a P2P capability subelement of the probe request frame. Power save mode of repeating the doze state and the awake state when the value of the sixth or seventh bit of the Device Capability Bitmap field is 1; Wi-Fi P2P device operating in the) is characterized in that the notification to switch to the active mode (active mode).

In order to solve the above technical problem, an embodiment of the P2P public action frame of the Wi-Fi peer to peer (P2P) standard according to the present invention is a type value of the P2P public action frame. Is any one of 9 to 255, the Wi-Fi P2P device operating in the power save mode of repeating the doze state and the awake state switches to the active mode. It is characterized by informing to do.

In order to solve the above technical problem, an embodiment of the P2P action frame of the Wi-Fi peer to peer (P2P) standard according to the present invention has a type value of the P2P action frame of 4 to 4; If any one of the 255, Wi-Fi P2P devices that operate in a power save mode that repeats the doze state and the awake state to notify the active mode It is characterized by.

The present invention includes a computer readable recording medium having recorded thereon a program for executing the method according to an embodiment of the present invention on a computer.

1 illustrates a use case in which a P2P group owner communicates with a P2P client according to an embodiment of the present invention.
2 is a diagram briefly illustrating a method of waking up a client by a group owner according to an embodiment of the present invention.
3 is a diagram schematically illustrating a method in which a client wakes up a group owner according to an embodiment of the present invention.
4 is a diagram illustrating an operation in a power saving mode of a Wi-Fi P2P device according to an embodiment of the present invention.
5 is a flowchart illustrating a method of waking up a group owner in a state in which a client does not have a P2P group according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a method of waking up a group owner in a state in which a P2P group is formed by a client according to an embodiment of the present invention.
7 illustrates the MAC frame format of IEEE 802.11.
8 is a diagram illustrating the definition of a device capability bitmap field of Wi-Fi P2P.
9 is a diagram illustrating a type of P2P public action frame of Wi-Fi P2P.
FIG. 10 is a diagram illustrating a type of P2P action frame of Wi-Fi P2P.
FIG. 11 is a flowchart illustrating a method in which a first device switches a second device from a power saving mode to an active mode according to an embodiment of the present invention.
12 is a flowchart illustrating a method of a first device for switching a second device from a power saving mode to an active mode according to another embodiment of the present invention.
FIG. 13 is a flowchart illustrating a method in which a first device switches a second device from a power saving mode to an active mode according to another embodiment of the present invention.
14 is a flowchart illustrating a method of switching a second device communicating with a first device from a power saving mode to an active mode according to an embodiment of the present invention.
15 is a diagram illustrating a configuration of a device for switching an external device from a power saving mode to an active mode according to an embodiment of the present invention.
16 is a diagram illustrating a configuration of a device for switching an external device from a power saving mode to an active mode according to another embodiment of the present invention.
17 is a diagram illustrating a configuration of a device for switching from a power saving mode to an active mode according to an embodiment of the present invention.

The above objects, features and advantages will become more apparent from the following detailed description in conjunction with the accompanying drawings. The following description and drawings are not to be interpreted in a limiting sense, and the various detailed descriptions are provided to provide a thorough understanding of the present invention, and are the basis of the claims, and the general knowledge of the present invention. It is the basis for teaching those who have the method of making and / or using the present invention.

In the following description of the present invention, detailed descriptions of related known functions or components will be omitted when it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be based on the contents throughout this specification. In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated. For convenience of explanation, the device and method should be described together when necessary.

For the components having substantially the same functional configuration among the drawings, the same reference numerals and reference numerals have been omitted as much as possible even if displayed on different drawings, and duplicate descriptions are omitted when necessary for the description of the drawings. It is important to note that components can be quoted. In addition, the size of each component in the drawings may be exaggerated for clarity of description.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 illustrates a use case in which a P2P group owner (GO) communicates with a P2P client 120 according to an embodiment of the present invention. The P2P group owner or group owner 110 in Wi-Fi P2P plays a role similar to that of an access point (AP) in conventional Wi-Fi, and the P2P client or client 120 in Wi-Fi P2P is conventional It plays a role similar to a station (STA) in Wi-Fi.

Wi-Fi P2P devices include a host and a network interface card (NIC), and the host and the NIC are on one board or connected by a slot or a cable. When in sleep state, the host is powered but switched off, and the NIC operates in sleep mode with power remaining. Here, the switched off state refers to standby, sleep, hibernation, or soft off. The NIC wakes up from sleep mode to active mode, bringing the host out of a switch-off state such as hibernation. In this way, strictly speaking, the NIC of the Wi-Fi P2P device operates as a group owner or a client, but for convenience, the Wi-Fi P2P device itself is also called a group owner or a client.

In the conventional Wi-Fi, it was necessary to have a separate AP in addition to the stations, but as more and more mobile devices are used, all devices may become group owners in Wi-Fi P2P. Accordingly, Wi-Fi P2P supports the power saving function of the group owner, which was not supported by the conventional Wi-Fi.

Conventional Wake on WLAN (WoWL) is a technique limited to the content defined in conventional Wi-Fi. That is, the station must operate in infrastructure mode and must be associated with an AP supporting WPA2 authentication. In addition, the AP should always be on. That is, it does not support the power saving mode of the AP. Therefore, there is a limit in waking the client 120 of the Wi-Fi P2P from the power saving mode using the WoWL technology. Also, WoWL only defines the case where the AP wakes up the station, and does not consider the case where the station wakes up the AP. Therefore, there is a limit in waking the group owner 110 of the Wi-Fi P2P from the power saving mode using the WoWL technology.

2 is a diagram briefly illustrating a method in which the group owner 110 wakes up the client 120 according to an embodiment of the present invention. The group owner 110 wakes up the client 120 from the power saving mode to the active mode by transmitting a specific packet called a magic packet to the client 120 operating in the power saving mode.

3 is a diagram schematically illustrating a method in which the client 120 wakes up the group owner 110 according to an embodiment of the present invention. The client 120 wakes up the group owner 110 from the power saving mode to the active mode by sending a magic packet to the group owner 110 operating in the power saving mode.

4 is a diagram illustrating an operation in a power saving mode of a Wi-Fi P2P device according to an embodiment of the present invention. The Wi-Fi P2P device operating in the power saving mode repeats the awake state and the doze state at intervals of a beacon interval. When the group owner 110 and the client 120 form a P2P group (peer to peer group) and are synchronized, each device knows when the counterpart device is in the awake state, but does not form a P2P group. When not in sync, each device does not know when the other device is awake. The present invention provides a method of waking up an external device not only when the group owner 110 and the client 120 form a P2P group, but also when the P2P group is not formed. However, it is assumed that both devices have previously formed a persistent group to store the credential.

5 is a flowchart illustrating a method of waking up the group owner 110 in a state in which the client 120 according to an embodiment of the present invention does not have a P2P group. For convenience of explanation, it is assumed that the client 120 is a Blu-ray Disk (BD) player that is a source device and the group owner 110 is a TV that is a sink device. Also, for convenience of description, a method of waking up the group owner 110 by the client 120 will be mainly described. However, the method described below can be applied to the case in which the group owner 110 wakes up the client 120.

 The group owner 110 of the persistent group periodically wakes up in an awake state and transmits a beacon while operating in the power saving mode (510).

When the client 120 is triggered by a user input or the like, for example, when the user wants to watch a BD, the client 120 transmits a magic packet to the group owner 110 through a predetermined channel. At this time, since the client 120 does not know when the group owner 110 is in the awake state, the client 120 repeatedly transmits the magic packet until a response to the magic packet is received from the group owner 110. The interval for repeatedly transmitting the magic packet is shorter than the period during which the group owner 110 is in the awake state. If the group owner 110 uses the same channel as the client 120, the group owner 110 receives the magic packet within one period, that is, the beacon interval. Accordingly, when the response to the magic packet is not received, the client 120 repeatedly transmits the magic packet for at least a beacon interval through one channel.

If the client 120 does not receive a response from the group owner 110 until one cycle passes, the client 120 changes the transmission channel to another channel (530) and repeatedly transmits the magic packet (520). ). If the client 120 does not receive a response from the group owner 110 until another period passes, steps 530 and 520 of changing the transmission channel and repeatedly transmitting the magic packet are repeated.

In one embodiment, the client 120 may preferentially use a channel that has recently communicated with the group owner 110. If the group owner 110 uses an existing channel, the group owner 110 receives the magic packet within one period, that is, the beacon interval.

In another embodiment, the client 120 may preferentially use a social channel. The social channels are channels 1, 6, and 11 in the 2.4 GHz band. If the group owner 110 uses the social channel, it will receive a magic packet within three periods, or three times the beacon interval.

In another embodiment, the client 120 may first use a channel that has recently communicated with the group owner 110 and then use a social channel. In this case, if the group owner 110 uses an existing channel or a social channel, the group owner 110 receives the magic packet within 4 periods.

If the client 120 knows the period during which the group owner 110 is in the doze state, the client 120 only needs to repeatedly transmit the magic packet for a time longer than the dose period through one channel. Accordingly, the client 120 may shorten the time to find the group owner 110 by changing the channel at a time slightly longer than the dose period.

Upon receiving the magic packet from the client 120, the group owner 110 transitions to an active state (540), and transmits a response to the magic packet to the client 120 to inform the success or failure of the magic packet (550).

When the client 120 receives a success response as a response to the magic packet from the group owner 110, the client 120 forms a P2P group with the group owner 110 to exchange data (560). That is, the client 120 proceeds to the Invitation Phase of the Wi-Fi P2P, and forms a persistent P2P group in the channel determined by exchanging an Invitation request and response message. Both devices know how to perform WPA authentication through shared credentials after the roles of the group owner 110 and the client 120 are determined in the previously established persistent group. Therefore, without going through the WPS negotiation (Negotiation), the client 120 is connected to the group owner 110 through the Authentication and Association request and response. It then carries out a 4-way handshake, a WPA negotiator. WPA negotiations will allow you to perform Security Setup. In this way, after the connection between the two devices is established at the second layer, data transmission is started at the application layer, and the video of the BD player is output to the TV.

FIG. 6 is a flowchart illustrating a method of waking up the group owner 110 in a state in which a client 120 according to an embodiment of the present invention forms a P2P group. Also, for convenience of description, a method of waking up the group owner 110 by the client 120 will be mainly described. However, the method described below may be applied to the case where the group owner 110 wakes up the client 120.

Since the client 120 and the group owner 110 belong to the same group, they are synchronized. After switching from the doze state to the awake state, the group owner 110 transmits a beacon to give information about the group to its group member or a new client or to synchronize with the group owner (610). Therefore, the BD player, which is the synchronous client 120, knows the time when the beacon is transmitted, that is, the time when the group owner 110 is awake. When triggered by a user's input or the like, the client 120 device receives a beacon transmitted by the group owner 110 in the next awake state and transmits a magic packet in the CTWindow of the group owner 110 (620).

Upon receiving the magic packet, the group owner 110 switches to the active mode (630) and transmits a response to the magic packet to the client 120 (640). This prepares two devices in the persistent group to transmit video data. Thereafter, data transmission is performed at the third layer (650).

Magic packet according to an embodiment of the present invention is compliant with IEEE 802.11 and Wi-Fi P2P. The magic packet includes the contents of a command for changing the value of the power management field, which is a subfield of the frame control field of the device that receives the magic packet, from 1 to 0 in any form. . That is, the magic packet includes a request to exit the power saving mode and prepare to receive image data. 7 shows the MAC frame format of IEEE 802.11.

In one embodiment, the Magic Packet is a Probe Request frame, and is a Reserved of the Device Capability Bitmap field of the P2P Capability subelement, which is one of the sub-arrays of the probe request frame. It can be implemented by adding to. 8 shows the definition of the Device Capability Bitmap field of the Wi-Fi P2P. When the value of the sixth bit or the seventh bit of the Device Capability Bitmap field is 1, it may indicate a magic packet.

In another embodiment, the magic packet is a P2P public action frame, and may be implemented by adding the reserved packet to a type of the P2P public action frame. 9 illustrates the type of P2P public action frame of Wi-Fi P2P. When the type value of the P2P public action frame is any one of 9 to 255, it may indicate a magic packet.

In another embodiment, the magic packet is a P2P action frame, and may be implemented by adding the reserved packet to a type of the P2P action frame. 10 illustrates a type of a P2P action frame of Wi-Fi P2P. When the type value of the P2P action frame is any one of 4 to 255, it may indicate a magic packet.

FIG. 11 is a flowchart illustrating a method in which a first device switches a second device from a power saving mode to an active mode according to an embodiment of the present invention. Referring to FIG. 11, in a method in which a first device switches a second device from a power saving mode to an active mode according to an embodiment of the present invention, a magic packet is transmitted to a second device operating in the power saving mode through a predetermined channel. Step 1110, and if a response to the magic packet has not been received from the second device, and a predetermined period has not elapsed after transmitting the magic packet through the predetermined channel, Retransmitting the magic packet (1120).

12 is a flowchart illustrating a method of a first device for switching a second device from a power saving mode to an active mode according to another embodiment of the present invention. The method shown in FIG. 12 is similar to the method shown in FIG. 11, but a response to the magic packet has not been received from the second device, and the predetermined period has elapsed after the first transmission of the magic packet through the predetermined channel. In one case, the method further includes a step 1210 of changing a transmission channel to transmit a magic packet through a channel different from the predetermined channel.

FIG. 13 is a flowchart illustrating a method in which a first device switches a second device from a power saving mode to an active mode according to another embodiment of the present invention. Referring to FIG. 13, in a method in which a first device switches a second device from a power saving mode to an active mode according to another embodiment of the present invention, forming and synchronizing a P2P group with the second device (1310), And based on the synchronization, when the second device operating in the power saving mode is in an awake state, transmitting a magic packet to the second device (1320).

14 is a flowchart illustrating a method of switching a second device communicating with a first device from a power saving mode to an active mode according to an embodiment of the present invention. Referring to FIG. 14, when the second device communicating with the first device switches from the power saving mode to the active mode, the second device operating in the power saving mode is in an awake state. Receiving the magic packet from the first device (1410), and switching to the active mode in response to the reception of the magic packet (1420).

FIG. 15 is a diagram illustrating a configuration of a device 1500 for switching a peer device from a power saving mode to an active mode according to an embodiment of the present invention. Referring to FIG. 15, the device 1500 for switching the external device from the power saving mode to the active mode according to an embodiment of the present invention transmits a magic packet to a counterpart device operating in the power saving mode through a predetermined channel. And a transmitting unit 1510 for receiving a response to the magic packet from the external device, and the transmitting unit 1510 receives a response to the magic packet from the external device, and transmits the predetermined channel. If a predetermined period has not elapsed after transmitting the magic packet via the packet, the magic packet is retransmitted through the predetermined channel.

FIG. 16 is a diagram illustrating a configuration of a device 1600 for switching an external device from a power saving mode to an active mode according to another embodiment of the present invention. Referring to FIG. 16, the device 1600 for switching the external device from the power saving mode to the active mode according to another embodiment of the present invention may include a synchronization unit 1610 for forming and synchronizing a P2P group with the external device, and the synchronization. And a transmitting unit 1620 that transmits a magic packet to the counterpart device when the counterpart device operating in the power save mode is in an awake state.

17 is a diagram illustrating a configuration of a device 1700 for switching from a power saving mode to an active mode according to an embodiment of the present invention. Referring to FIG. 17, the device 1700 that switches from the power saving mode to the active mode according to an embodiment of the present invention receives a magic packet when the device 1700 operating in the power saving mode is in an awake state. And a switching unit 1720 for switching to an active mode in response to the reception of the magic packet.

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all storage media, including magnetic storage media, optical reading media and carrier waves (eg, transmission over the Internet). It is also possible to record the data format of the message used in the present invention on a recording medium.

So far, the present invention has been described in detail with reference to the preferred embodiments shown in the drawings. These examples are merely illustrative and not intended to limit the present invention, and should be considered in descriptive sense only and not for purposes of limitation. Although specific terms have been used herein, they are used only for the purpose of illustrating the concept of the invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those of ordinary skill in the art to which the present invention pertains have various deletions, substitutions, changes, etc., without departing from the essential technical spirit of the present invention claimed in the claims, although the present invention is not clearly described or illustrated herein. It will be appreciated that through various modifications and equivalent other embodiments to implement the principles of the present invention through.

The true technical protection scope of the present invention should be defined by the technical spirit of the appended claims rather than the foregoing description, and all structural and functional equivalents within the scope will be construed as being included in the present invention. . Such equivalents should be understood to include not only equivalents now known, but also equivalents to be developed in the future, ie all components invented to perform the same function regardless of structure.

Claims (33)

A method in which a first device switches a second device from a power save mode to an active mode,
Magic packet informing the second device operating in the power saving mode of repeating the doze state and the awake state according to a predetermined period to switch to the active mode through a predetermined channel. Transmitting; And
If a response to the magic packet has not been received from the second device and a predetermined period has not elapsed after transmitting the magic packet through the predetermined channel, the magic packet is retransmitted through the predetermined channel. And comprising a step. The method of claim 1,
If the response to the magic packet has not been received from the second device and the predetermined period has elapsed since the first transmission of the magic packet through the predetermined channel, the magic packet is transmitted through a channel different from the predetermined channel. Transmitting the packet. The method of claim 1,
And said predetermined time is longer than a period of time during which said second device is in said dose state. The method of claim 1,
And said predetermined time is equal to said predetermined period. The method of claim 1,
The predetermined period is a beacon interval. The method of claim 1,
The predetermined channel comprises a channel used when the first device has recently communicated with the second device. The method of claim 1,
The predetermined channel comprises a social channel. The method of claim 1,
And when a response to the magic packet is received from the second device, forming a peer to peer group with the second device. The method of claim 8,
Forming the P2P group,
And forming a P2P group with the second device by using the credentials stored in the first device. The method of claim 1,
The first device is a peer to peer client and the second device is a peer to peer group owner. The method of claim 1,
The magic packet is a probe request frame,
The value of the sixth bit or the seventh bit of the Device Capability Bitmap field of the P2P Capability subelement of the probe request frame is 1. The method of claim 1,
The magic packet is a P2P public action frame.
The type value of the P2P public action frame is any one of 9 to 255. The method of claim 1,
The magic packet is a P2P action frame,
The type value of the P2P action frame is any one of 4 to 255. The method of claim 1,
Wherein the first device and the second device are Wi-Fi P2P devices. A method in which a first device switches a second device from a power save mode to an active mode,
Forming and synchronizing a peer-to-peer group with the second device; And
Based on the synchronization, when the second device operating in the power saving mode repeating a doze state and an awake state is in the awake state, informing the user to switch to the active mode. Sending a magic packet to the second device. 16. The method of claim 15,
One of the first device and the second device is a peer to peer client, the other is a peer to peer group owner,
And when the second device is in the awake state, the P2P group owner sends a beacon to the P2P client. 16. The method of claim 15,
Wherein the first device is a P2P client and the second device is a P2P group owner. The method of claim 17,
The step of transmitting the magic packet,
When the second device is in the awake state, transmitting the magic packet to the second device after receiving a beacon from the second device. The method of claim 17,
The step of transmitting the magic packet,
Transmitting the magic packet within a Client Traffic Window (CTWindow). A method for switching a second device in communication with a first device from a power save mode to an active mode, the method comprising:
The first packet is a magic packet notifying the switch to the active mode when the second device operating in the power saving mode repeating a doze state and an awake state is in the awake state; Receiving from the device; And
In response to receiving the magic packet, switching to the active mode. The method of claim 20,
Receiving the magic packet,
And receiving the magic packet when it is not synchronized with the first device. The method of claim 20,
And forming a peer to peer group with the first device after switching to the active mode. The method of claim 22,
Forming the P2P group,
And forming a P2P group with the first device by using the credentials stored in the second device. The method of claim 20,
And forming and synchronizing a peer-to-peer group with the first device,
Receiving the magic packet,
Based on the synchronization, when the second device is in the awake state, receiving the magic packet from the first device. The method of claim 20,
The first device is a peer to peer client and the second device is a peer to peer group owner. The method of claim 25,
Receiving the magic packet,
When the second device is in the awake state, receiving the magic packet from the first device after transmitting a beacon to the first device. A device for switching a peer device from a power save mode to an active mode,
Sends a magic packet notifying the switching to the active mode through a predetermined channel to the counterpart device operating in the power saving mode which repeats the doze state and the awake state according to a predetermined period. A transmitting unit; And
Receiving unit for receiving a response to the magic packet from the external device,
The transmitting unit,
Retransmitting the magic packet through the predetermined channel if a response to the magic packet has not been received from the counterpart device and a predetermined period has not elapsed after transmitting the magic packet through the predetermined channel. Featured equipment. A device for switching a peer device from a power save mode to an active mode,
A synchronization unit for forming and synchronizing a peer-to-peer group with the counterpart device; And
Based on the synchronization, a magic indicating to switch to the active mode when the counterpart device operating in the power saving mode repeating the doze state and the awake state is in the awake state. And a transmitter for transmitting a packet to the counterpart device. Device that switches from power save mode to active mode,
A receiving unit which receives a magic packet notifying the user of switching to the active mode when the device operating in the power saving mode which repeats a doze state and an awake state is in the awake state; And
And a switching unit for switching to the active mode when the magic packet is received. Probe Request frame of Wi-Fi peer to peer (P2P) standard,
A doze state and an awake state when a value of a sixth bit or a seventh bit of a device capability bitmap field of a P2P capability subelement of the probe request frame is 1 Probe request frame, characterized in that the Wi-Fi P2P device operating in a power save mode that repeats the (awake state) to switch to the active mode. P2P public action frame (P2P public action frame) of the Wi-Fi peer to peer (P2P) standard,
Wi-Fi operating in a power save mode that repeats a doze state and an awake state when the type value of the P2P public action frame is any one of 9 to 255. P2P public action frame, characterized in that telling the P2P device to switch to the active mode (active mode). As a P2P action frame of the Wi-Fi peer to peer (P2P) standard,
Wi-Fi P2P operating in a power save mode that repeats a doze state and an awake state when the type value of the P2P action frame is any one of 4 to 255. P2P action frame, characterized in that the device to switch to the active mode (active mode). A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 1 to 26.

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