KR20220073618A - Method and apparatus for securely sharing non-face-to-face order and payment information - Google Patents

Abstract

The present invention is a method of securely sharing non-face-to-face order and payment information, in which a first STA (station) provides shared data including information related to ordering and payment to a first access point (AP) and a second STA that is a destination STA Transmitting, by the first AP, a first physical protocol data unit (PPDU) including information on step, the first AP transmitting a third PPDU including the shared data and the first individual data for the second STA to the second STA according to the information on the second STA, the second AP transmitting, by the second STA, a fourth PPDU including the shared data and second individual data for the second STA to the second STA according to the information on the second STA; It may include decoding the shared data received from the AP and the second AP.

Description

METHOD AND APPARATUS FOR SECURELY SHARING NON-FACE-TO-FACE ORDER AND PAYMENT INFORMATION

The present invention relates to a method of securely sharing order and payment information between STAs (stations) in a wireless local area network (WLAN) system.

In general, each region's distinctive restaurants are loved by local residents as well as tourists and residents of other regions.

However, in order to use these local restaurants, residents of other regions must visit the local restaurants directly, spending a lot of time and money.

In addition, there are restaurants that deliver food to other regions, but users who order food delivery to a restaurant usually receive food delivered at home, so setting up a table is very cumbersome for the user, and from the perspective of a restaurant, it is usually difficult to cook food alone. Because of this, it was difficult to manage the tasks of receiving reservation orders or processing information necessary for delivery through the system.

On the other hand, in a typical restaurant in the related art, since the entire process of cooking food must be performed in the restaurant, a professional level chef is absolutely necessary, and various resources necessary for cooking such as a kitchen space and kitchen tools are required.

In addition, it has been practically impossible for the user to enjoy all the food of the restaurants at a convenient time in one place because the distances of the restaurants are usually far away from each other.

On the other hand, the Internet consists of a huge number of computers and computer networks that interconnect these computers worldwide through communication links.

Interconnected computers exchange information using a variety of services, such as e-mail, gopher, and the World Wide Web (WWW). The World Wide Web allows a server computer system (eg a web server or website) to send graphical web pages of information to a remote client computer system.

Such a remote client computer system can display web pages of various screens received from the server computer.

Meanwhile, recently 2G, 3G, 4G, 5G, LTE, etc. mobile communication networks, WIFI communication networks, Bluetooth communication networks, cellular networks, CDMA networks, LTE networks, Ethernet networks, WiMAX networks, local area networks (LAN), wide area networks (WAN), RF As wireless communication networks such as communication networks, infrared communication networks, and optical communication networks have developed rapidly, various systems have been developed using such wireless communication networks.

In addition, a wireless local area network (WLAN) has been improved in various ways. For example, the IEEE 802.11ax standard proposes an improved communication environment using OFDMA (orthogonal frequency division multiple access) and DL MU downlink multi-user multiple input, multiple output (MIMO) techniques.

This specification proposes a data sharing system or a shared data security system between an access point (AP) and a non-AP station (STA) operating in a WLAN system.

An embodiment of the present invention for solving the above problems is to provide a method for sharing order and payment information between STAs (stations) in a wireless local area network (WLAN) system.

An embodiment of the present invention for solving the above problems is to provide a method of securing order and payment information shared between STAs (stations) in a wireless local area network (WLAN) system.

However, the technical problems to be achieved by the present invention and embodiments of the present invention are not limited to the technical problems described above, and other technical problems may exist.

A method performed in a wireless local area network (WLAN) system for non-face-to-face ordering and payment according to an embodiment of the present invention for achieving the above object is a first STA (station), a first access (AP) point) transmitting a first physical protocol data unit (PPDU) including shared data including information related to ordering and payment and information on a second STA that is a destination STA, the first AP, the second AP transmitting, by the first AP, a second PPDU including the shared data and information on the second STA to a second STA, the shared data and the second STA to a second STA according to the information on the second STA transmitting, by the second AP, a third PPDU including first individual data for Transmitting a fourth PPDU including data and decoding, by the second STA, the shared data received from the first AP and the second AP.

Here, the third PPDU further includes first security information, the fourth PPUD further includes second security information, and the second STA receives shared data from the first AP and the second AP. Decoding may include decoding the shared data based on the first security information and the second security information.

Here, the first security information and the second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal.

Here, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the shared data transmitted by the first STA. may be a second redundancy version of

Here, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second AP. It may be set lower than the coding rate of shared data to be transmitted.

Here, the same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information is information necessary for descrambling the shared data. including a first part, wherein the second security information includes a second part of information necessary for descrambling the shared data, and further comprising the step of exchanging a security key (Key) between the STA and the first AP can do.

Here, the security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key divides the first part and the second part. It is a hash value of information required for scrambling, and the method may further include, by the STA, descrambling the shared data based on the first part, the second part, and the security key value.

In a wireless local area network (WLAN) system for non-face-to-face ordering and payment according to an embodiment of the present invention for achieving the above object, the wireless LAN system includes a first STA (station) and a second STA , a first access point (AP) and a second AP, and the first STA provides the first AP with shared data including information related to ordering and payment and information on the second STA as a destination STA. transmits a first physical protocol data unit (PPDU) including The AP transmits a third PPDU including the shared data and the first individual data for the second STA to the second STA according to the information on the second STA, and the second AP sends the second Transmitting a fourth PPDU including the shared data and second individual data for the second STA to the second STA according to the information on the STA, and the second STA, the first AP and the second AP It is possible to decode the shared data received from.

Here, the third PPDU further includes first security information, the fourth PPUD further includes second security information, and the second STA receives shared data from the first AP and the second AP. Decoding may include decoding the shared data based on the first security information and the second security information.

Here, the first security information and the second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal.

Here, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the shared data transmitted by the first STA. may be a second redundancy version of

Here, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second AP. It may be set lower than the coding rate of shared data to be transmitted.

Here, the same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information is information necessary for descrambling the shared data. A first part may be included, and the second security information may include a second part of information necessary for descrambling the shared data, and the STA and the first AP may exchange a security key.

Here, the security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key divides the first part and the second part. It is a hash value of information required for scrambling, and the STA may descramble the shared data based on the first part, the second part, and the security key value.

As a second STA (station) included in a wireless local area network (WLAN) system for non-face-to-face ordering and payment according to an embodiment of the present invention for achieving the above object, a first access point (AP) Receives a third physical protocol data unit (PPUD) including shared data including information related to order and payment and first individual data for the second STA from the second AP, and the shared data and the second data from the second AP Receive a fourth PPUD including second individual data for the STA, decode the shared data received from the first AP and the second AP, and the shared data is included in the first PPDU from the first STA Transmitted to the first AP, the first PPDU further includes information on the second STA, the shared data is included in a second PPDU and transmitted from the first AP to the second AP, 2 PPDI may further include information on the second STA.

Here, the third PPDU further includes first security information, the fourth PPUD further includes second security information, and decoding of the shared data is based on the first security information and the second security information. can be performed with

Here, the first security information and the second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal.

Here, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the shared data transmitted by the first STA. may be a second redundancy version of

Here, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second AP. It may be set lower than the coding rate of shared data to be transmitted.

Here, the same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information is information necessary for descrambling the shared data. A first part may be included, and the second security information may include a second part of information necessary for descrambling the shared data, and the STA and the first AP may exchange a security key.

Here, the security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key divides the first part and the second part. It is a hash value of information required for scrambling, and the STA may descramble the shared data based on the first part, the second part, and the security key value.

As a first access point (AP) included in a wireless local area network (WLAN) system for non-face-to-face ordering and payment according to an embodiment of the present invention for achieving the above object, a first STA (station) Receives a first physical protocol data unit (PPDU) including shared data including information related to ordering and payment and information on a second STA that is a destination STA from the second AP, and the shared data and the second STA to a second AP transmits a second PPDU including information on and the shared data transmitted to the second STA is decoded by the second STA together with the shared data transmitted from the second AP based on information on the second STA, and the second AP from the second AP The shared data transmitted based on the information on the second STA may be included in a fourth PPDU together with the second individual data for the second STA and transmitted from the second AP to the second STA.

Here, the third PPDU further includes first security information, the fourth PPUD further includes second security information, and decoding of the shared data is based on the first security information and the second security information. can be performed with

Here, the first security information and the second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal.

Here, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the shared data transmitted by the first STA. may be a second redundancy version of

Here, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second AP. It may be set lower than the coding rate of shared data to be transmitted.

Here, the same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information is information necessary for descrambling the shared data. A first part may be included, and the second security information may include a second part of information necessary for descrambling the shared data, and the STA and the first AP may exchange a security key.

Here, the security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key divides the first part and the second part. It is a hash value of information required for scrambling, and the STA may descramble the shared data based on the first part, the second part, and the security key value.

According to the present invention, the AP and the STAs can share order and payment information. Shared data can be shared with OBSS as well as within BSS. Data shared in the OBSS may be transmitted in a broadcasting manner because the STAs of the OBSS cannot know information about the STAs in the BSS.

In addition, APs may include information on STAs corresponding to each BSS, and may share data not only with STAs within the BSS but also with STAs of the OBSS. Data transmitted from each AP may be different redundancy versions of the same data, so the STA receiving the shared data may receive multiple redundancy versions for the shared data, even if it is initially transmitted data, not retransmitted data, There is an effect that can increase the reception gain.

In addition, the PPDU transmitted by each AP may include not only shared data but also individual data transmitted individually. Here, by setting the coding rate of the shared data to be lower than the coding rate of the individual data, it is possible to further increase the reliability of the order and payment information.

According to the present invention, since the security key value is shared in the association step, it may be difficult to obtain the security key outside the BSS. In addition, since information for descrambling shared data is transmitted separately in the PPDU transmitted by the first AP and the PPDU transmitted by the second AP, shared data unless both information is obtained from the first AP and the second AP. It is difficult to obtain all the information for descrambling . Also, since the security key is a hash value, it may be difficult to obtain the actual value even if information is obtained. In addition, since information for descrambling shared data is obtained by descrambling the first part and the second part based on the security key, security for order and payment information can be enhanced.

1 shows an example of a transmitting apparatus and/or a receiving apparatus of the present specification.
2 is a conceptual diagram illustrating the structure of a wireless LAN (WLAN).
3 is a diagram illustrating an example of a wireless LAN system in which data sharing for non-face-to-face ordering and payment is performed.
4 is a flowchart illustrating an embodiment of a data sharing method for non-face-to-face ordering and payment.
5 is a flowchart illustrating an embodiment of an STA operation in which a data sharing security method for non-face-to-face ordering and payment is performed.
6 is a diagram illustrating an embodiment of information required for descrambling shared data for non-face-to-face ordering and payment.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

Terms such as first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate the overall understanding, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

1 shows an example of a transmitting apparatus and/or a receiving apparatus of the present specification.

The example of FIG. 1 may perform various technical features described below. 1 relates to at least one STA (station). For example, the STAs 110 and 120 of the present specification are a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), It may also be called by various names such as a mobile station (MS), a mobile subscriber unit, or simply a user. The STAs 110 and 120 in the present specification may be referred to by various names such as a network, a base station, a Node-B, an access point (AP), a repeater, a router, and a relay. In the present specification, the STAs 110 and 120 may be referred to by various names such as a receiving device (apparatus), a transmitting device, a receiving STA, a transmitting STA, a receiving device, and a transmitting device.

For example, in the non-face-to-face ordering and payment system according to an embodiment, the STA may represent a user terminal that processes an order and payment, that is, a user's mobile terminal, and a restaurant that receives information from the user terminal and processes the order and payment It may indicate a terminal. In addition, the STA may represent a POS terminal in a restaurant or a manufacturing terminal in a restaurant. Accordingly, according to an embodiment, data is shared not only with the user terminal but also with the POS terminal and the manufacturing terminal in the restaurant, so that a quick and hassle-free order and payment process can be provided.

For example, the STAs 110 and 120 may perform an access point (AP) role or a non-AP role. That is, the STAs 110 and 120 of the present specification may perform AP and/or non-AP functions. In this specification, the AP may also be indicated as an AP STA.

The STAs 110 and 120 of the present specification may support various communication standards other than the IEEE 802.11 standard. For example, a communication standard (eg, LTE, LTE-A, 5G NR standard) according to the 3GPP standard may be supported. In addition, the STA of the present specification may be implemented in various devices such as a mobile phone, a vehicle, and a personal computer. In addition, the STA of the present specification may support communication for various communication services such as voice call, video call, data communication, and autonomous driving (Self-Driving, Autonomous-Driving).

In this specification, the STAs 110 and 120 may include a medium access control (MAC) conforming to the IEEE 802.11 standard and a physical layer interface for a wireless medium.

The STAs 110 and 120 will be described based on the sub-view (a) of FIG. 1 as follows.

The first STA 110 may include a processor 111 , a memory 112 , and a transceiver 113 . The illustrated processor, memory, and transceiver may each be implemented as separate chips, or at least two or more blocks/functions may be implemented through one chip.

The transceiver 113 of the first STA performs a signal transmission/reception operation. Specifically, IEEE 802.11 packets (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) may be transmitted/received.

For example, the first STA 110 may perform an intended operation of the AP. For example, the processor 111 of the AP may receive a signal through the transceiver 113 , process the received signal, generate a transmission signal, and perform control for signal transmission. The memory 112 of the AP may store a signal (ie, a received signal) received through the transceiver 113 , and may store a signal to be transmitted through the transceiver (ie, a transmission signal).

For example, the second STA 120 may perform an intended operation of a non-AP STA. For example, the transceiver 123 of the non-AP performs a signal transmission/reception operation. Specifically, IEEE 802.11 packets (eg, IEEE 802.11a/b/g/n/ac/ax/be, etc.) may be transmitted/received.

For example, the processor 121 of the non-AP STA may receive a signal through the transceiver 123 , process the received signal, generate a transmission signal, and perform control for signal transmission. The memory 122 of the non-AP STA may store a signal (ie, a received signal) received through the transceiver 123 and may store a signal to be transmitted through the transceiver (ie, a transmission signal).

For example, an operation of a device indicated as an AP in the following specification may be performed by the first STA 110 or the second STA 120 . For example, when the first STA 110 is an AP, the operation of the device marked as AP is controlled by the processor 111 of the first STA 110 , and is controlled by the processor 111 of the first STA 110 . Relevant signals may be transmitted or received via the controlled transceiver 113 . In addition, control information related to an operation of the AP or a transmission/reception signal of the AP may be stored in the memory 112 of the first STA 110 . In addition, when the second STA 110 is an AP, the operation of the device indicated by the AP is controlled by the processor 121 of the second STA 120 and controlled by the processor 121 of the second STA 120 . A related signal may be transmitted or received via the transceiver 123 that is used. In addition, control information related to an operation of the AP or a transmission/reception signal of the AP may be stored in the memory 122 of the second STA 110 .

For example, an operation of a device indicated as a non-AP (or User-STA) in the following specification may be performed by the first STA 110 or the second STA 120 . For example, when the second STA 120 is a non-AP, the operation of the device marked as non-AP is controlled by the processor 121 of the second STA 120, and the processor ( A related signal may be transmitted or received via the transceiver 123 controlled by 121 . In addition, control information related to the operation of the non-AP or the AP transmit/receive signal may be stored in the memory 122 of the second STA 120 . For example, when the first STA 110 is a non-AP, the operation of the device marked as non-AP is controlled by the processor 111 of the first STA 110 , and the processor ( Related signals may be transmitted or received via transceiver 113 controlled by 111 . In addition, control information related to the operation of the non-AP or the AP transmission/reception signal may be stored in the memory 112 of the first STA 110 .

In the following specification (transmission / reception) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmission / reception) Terminal, (transmission / reception) device , (transmitting/receiving) apparatus, a device called a network, etc. may refer to the STAs 110 and 120 of FIG. 1 . For example, without specific reference numerals (transmitting/receiving) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmitting/receiving) Terminal, (transmitting) A device indicated by a /receiver) device, a (transmit/receive) apparatus, and a network may also refer to the STAs 110 and 120 of FIG. 1 . For example, in the following example, an operation in which various STAs transmit and receive signals (eg, PPPDUs) may be performed by the transceivers 113 and 123 of FIG. 1 . In addition, in the following example, the operations of the various STAs generating transmission/reception signals or performing data processing or calculation in advance for the transmission/reception signals may be performed by the processors 111 and 121 of FIG. 1 . For example, an example of an operation of generating a transmission/reception signal or performing data processing or operation in advance for a transmission/reception signal is 1) Determining bit information of a subfield (SIG, STF, LTF, Data) field included in a PPDU /Acquisition/configuration/computation/decoding/encoding operation, 2) time resource or frequency resource (eg, subcarrier resource) used for the subfield (SIG, STF, LTF, Data) field included in the PPDU, etc. operation of determining / configuring / obtaining, 3) a specific sequence (eg, pilot sequence, STF / LTF sequence, SIG) used for the subfield (SIG, STF, LTF, Data) field included in the PPDU operation of determining / configuring / acquiring an extra sequence), etc., 4) a power control operation and / or a power saving operation applied to the STA, 5) an operation related to determination / acquisition / configuration / operation / decoding / encoding of an ACK signal may include In addition, in the following example, various information (eg, field/subfield/control field/parameter/power related information) used by various STAs for determination/acquisition/configuration/computation/decoding/encoding of transmit/receive signals is may be stored in the memories 112 and 122 of FIG. 1 .

The device/STA of the sub-view (a) of FIG. 1 described above may be modified as shown in the sub-view (b) of FIG. 1 . Hereinafter, the STAs 110 and 120 of the present specification will be described based on the sub-drawing (b) of FIG. 1 .

For example, the transceivers 113 and 123 illustrated in (b) of FIG. 1 may perform the same function as the transceivers illustrated in (a) of FIG. 1 . For example, the processing chips 114 and 124 illustrated in (b) of FIG. 1 may include processors 111 and 121 and memories 112 and 122 . The processors 111 and 121 and the memories 112 and 122 illustrated in (b) of FIG. 1 are the processors 111 and 121 and the memories 112 and 122 illustrated in (a) of FIG. ) can perform the same function.

As described below, a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile Mobile Subscriber Unit, user, user STA, network, base station, Node-B, access point (AP), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting STA, Receiving Device, Transmitting Device, Receiving Apparatus, and/or Transmitting Apparatus means the STAs 110 and 120 shown in the sub-drawings (a)/(b) of FIG. ) may mean the processing chips 114 and 124 shown in FIG. That is, the technical features of the present specification may be performed on the STAs 110 and 120 shown in (a)/(b) of FIG. 1, and the processing chip ( 114 and 124). For example, a technical feature in which a transmitting STA transmits a control signal is that the control signals generated by the processors 111 and 121 shown in the sub-drawings (a)/(b) of FIG. 1 are (a) of FIG. ) / (b) can be understood as a technical feature transmitted through the transceivers 113 and 123 shown in (b). Alternatively, the technical feature in which the transmitting STA transmits the control signal is a technical feature in which a control signal to be transmitted to the transceivers 113 and 123 is generated from the processing chips 114 and 124 shown in the sub-view (b) of FIG. can be understood

For example, the technical feature in which the receiving STA receives the control signal may be understood as the technical feature in which the control signal is received by the transceivers 113 and 123 shown in the sub-drawing (a) of FIG. 1 . Alternatively, the technical feature that the receiving STA receives the control signal is that the control signal received by the transceivers 113 and 123 shown in the sub-drawing (a) of FIG. 1 is the processor shown in (a) of FIG. 111, 121) can be understood as a technical feature obtained by. Alternatively, the technical feature for the receiving STA to receive the control signal is that the control signal received by the transceivers 113 and 123 shown in the sub-view (b) of FIG. 1 is the processing chip shown in the sub-view (b) of FIG. It can be understood as a technical feature obtained by (114, 124).

Referring to (b) of FIG. 1 , software codes 115 and 125 may be included in the memories 112 and 122 . The software codes 115 and 125 may include instructions for controlling the operations of the processors 111 and 121 . Software code 115, 125 may be included in a variety of programming languages.

The processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and/or data processing devices. The processor may be an application processor (AP). For example, the processors 111 and 121 or the processing chips 114 and 124 illustrated in FIG. 1 may include a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (Modem). and demodulator). For example, the processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 are a SNAPDRAGON™ series processor manufactured by Qualcomm®, an EXYNOSTM series processor manufactured by Samsung®, and a processor manufactured by Apple®. It may be an A series processor, a HELIOTM series processor manufactured by MediaTek®, an ATOMTM series processor manufactured by INTEL®, or a processor enhanced therewith.

In this specification, uplink may mean a link for communication from a non-AP STA to an AP STA, and an uplink PPDU/packet/signal may be transmitted through the uplink. In addition, in this specification, downlink may mean a link for communication from an AP STA to a non-AP STA, and a downlink PPDU/packet/signal may be transmitted through the downlink.

Referring to FIG. 1 , a wireless LAN system according to an embodiment of the present invention may include at least one processor 111 , 121 , memories 112 , 122 , and transceivers 113 and 123 .

The processors 111 and 121 may execute program commands stored in the memories 112 and 122 . The processors 111 and 121 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to the present invention are performed. The memories 112 and 122 may be configured as volatile storage media and/or non-volatile storage media. For example, the memories 112 and 122 may be configured as read only memory (ROM) and/or random access memory (RAM).

The memories 112 and 122 may store at least one instruction executed through the processors 111 and 121 . The at least one command is, in the WLAN system, a command for generating a list of STAs to share data with, by a first station (STA), and a first command including shared data from the first STA to a first access point (AP). 1 PPDU (physical protocol data unit) is transmitted, wherein the first PPDU further includes information on the STA list, and the shared data is information related to ordering and payment, a command, the first AP, a second A command for transmitting a second PPDU including the shared data to the AP, the first AP including the shared data and the first individual data for the second STA to a second STA included in the STA list A command to transmit 3 PPDU, a command for the second AP to transmit a fourth PPDU including the shared data and second individual data for the second STA to the second STA included in the STA list; The second STA may include a command for decoding the shared data received from the first AP and the shared data received from the second AP through hybrid automatic repeat request (HARQ) combining.

Here, the third PPDU includes a PHY (physical) layer signal, a SIG field, a short training field (STF), and a long training field (LTF), and the shared data and the first individual data are MAC (media access control) It may be a hierarchical signal.

Here, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the shared data transmitted by the first STA. may be a second redundancy version of

Here, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second AP. It may be set lower than the coding rate of shared data to be transmitted.

Here, the STA list further includes a third STA, and the third STA transmits the third and fourth redundancy versions of the shared data in a broadcasting manner. , a command for performing HARQ combining on the first to fourth redundancy versions of the shared data may be further included.

Here, the third PPDU includes a physical service data unit (PSDU), and the PSDU is continuous to first symbols and the first symbols including the first shared data, and the first shared It may include second symbols including data, and the second symbols may be phase-shifted based on the first symbols.

For example, the shared data according to an embodiment may be data to be shared by the first to third STAs and the first to second APs. For example, the shared data may be non-face-to-face order information and/or payment information. For example, the first to third STAs and the first to second APs may be terminals constituting a non-face-to-face ordering system, and the first to third STAs and the first to second APs place a non-face-to-face order. may share order information and/or payment information for For example, when the first STA transmits non-face-to-face order information to the first AP, the first AP may share the order information of the first STA to the second AP, the second STA, and the third STA. Or, for example, when the first STA transmits non-face-to-face payment information to the first AP, the first AP may share the payment information of the first STA to the second AP, the second STA, and the third STA. . For example, the second STA may require order information and/or payment information of the first STA, and the second STA may request order information of the first STA from the first AP, the second AP, and the third STA. and/or may obtain payment information.

Alternatively, the memories 112 and 122 may store at least one instruction executed through the processors 111 and 121 . At least one command is, in a wireless LAN system, a station (STA) receiving a first PPDU including first security information, shared data, and first individual data from a first access point (AP), the sharing The data is information related to ordering and payment, a command, the STA receiving a second PPDU including the second security information, the shared data, and the second individual data from a second AP, the STA receiving the It may include a command for decoding the shared data based on the first security information and the second security information, and a command for the STA to decode the first and second individual data.

Here, the first and second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal.

Here, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the shared data transmitted by the first STA. may be a second redundancy version of

Here, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second AP. It may be set lower than the coding rate of shared data to be transmitted.

Here, the same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information is information required for descrambling the shared data. a first part, wherein the second security information includes a second part of information necessary for descrambling the shared data, and further includes a command for the STA and the first AP to exchange a security key and the security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key divides the first part and the second part. It is a hash value of information required for scrambling, A command for the STA to descramble the first part and the second part based on the security key value to obtain information necessary for descrambling the shared data, and a command for the STA to descramble the shared data may further include.

Here, the first part and the second part may be a value obtained by distributing bits of information necessary for descrambling the shared data in proportion to a coding rate value of the first individual data and a coding rate value of the second individual data have.

For example, the shared data according to an embodiment may be data to be shared by the STA and the first to second APs. For example, the shared data may be non-face-to-face order information and/or payment information. For example, the STA and the first and second APs may be terminals constituting a non-face-to-face ordering system, and the STA and the first and second APs share order information and/or payment information for non-face-to-face ordering. can do. For example, the first AP may share non-face-to-face order information with the STA. Or, for example, the first AP may share non-face-to-face payment information with the STA. For example, the STA may require order information and/or payment information of the first and second APs, and the STA may obtain order information and/or payment information from the first AP and the second AP.

Alternatively, the memories 112 and 122 may store at least one instruction executed through the processors 111 and 121 . The at least one command is a first physical first PPDU (PPDU) including shared data including information related to an order and payment from a first STA (station) to a first access point (AP), and information about a second STA that is a destination STA protocol data unit), the first AP transmits a second PPDU including the shared data and information on the second STA to the second AP, the first AP transmits the second A command to transmit a third PPDU including the shared data and the first individual data for the second STA to the second STA according to the information on the STA, the second AP according to the information on the second STA A command for transmitting a fourth PPDU including the shared data and second individual data for the second STA to the second STA, and the shared data received by the second STA from the first AP and the second AP It may include instructions for decoding

Here, the third PPDU further includes first security information, the fourth PPUD further includes second security information, and the second STA receives shared data from the first AP and the second AP. The command for decoding may include a command for decoding the shared data based on the first security information and the second security information.

Here, the first security information and the second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal.

Here, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the shared data transmitted by the first STA. may be a second redundancy version of

Here, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second AP. It may be set lower than the coding rate of shared data to be transmitted.

Here, the same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information is information necessary for descrambling the shared data. a first part, wherein the second security information includes a second part of information necessary for descrambling the shared data, and further includes a command for the STA and the first AP to exchange a security key can do.

Here, the security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key divides the first part and the second part. It is a hash value of information required for scrambling, and the STA may further include a command for descrambling the shared data based on the first part, the second part, and the security key value.

2 is a conceptual diagram illustrating the structure of a wireless LAN (WLAN).

The upper part of FIG. 2 shows the structure of an infrastructure basic service set (BSS) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.

Referring to the upper part of FIG. 2 , a wireless LAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter, BSSs). The BSSs 200 and 205 are a set of APs and STAs such as an access point (AP) 225 and a station 200-1 (STA1) that can communicate with each other through successful synchronization, and are not a concept indicating a specific area. The BSS 205 may include one or more combinable STAs 205 - 1 and 205 - 2 to one AP 230 .

The BSS may include at least one STA, the APs 225 and 230 providing a distribution service, and a distribution system (DS) 210 connecting a plurality of APs.

The distributed system 210 may implement an extended service set (ESS) 240 that is an extended service set by connecting several BSSs 200 and 205 . The ESS 240 may be used as a term indicating one network in which one or several APs are connected through the distributed system 210 . APs included in one ESS 240 may have the same service set identification (SSID).

The portal 220 may serve as a bridge connecting a wireless LAN network (IEEE 802.11) and another network (eg, 802.X).

In the BSS as shown in the upper part of FIG. 2 , a network between the APs 225 and 230 and a network between the APs 225 and 230 and the STAs 200 - 1 , 205 - 1 and 205 - 2 may be implemented. However, it may be possible to establish a network and perform communication even between STAs without the APs 225 and 230 . A network that establishes a network and performs communication even between STAs without the APs 225 and 230 is defined as an ad-hoc network or an independent basic service set (IBSS).

The lower part of FIG. 2 is a conceptual diagram illustrating the IBSS.

Referring to the lower part of FIG. 2 , the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not include an AP, there is no centralized management entity that performs a centralized management function. That is, in the IBSS, the STAs 250-1, 250-2, 250-3, 255-4, and 255-5 are managed in a distributed manner. In IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) can be mobile STAs, and access to a distributed system is not allowed, so a self-contained network network) is formed.

3 is a diagram illustrating an example of a wireless LAN system in which data sharing for non-face-to-face ordering and payment is performed.

Referring to FIG. 3 , a wireless LAN system may include a first AP 310 , a second AP 320 , a first STA 330 , a second STA 340 , and a third STA 350 . . The WLAN system may support hybrid automatic repeat request (HARQ). The first AP 310 , the second AP 320 , the first STA 330 , the second STA 340 , and the third STA 350 may transmit/receive data to and from each other. For example, the first STA 330 and the second STA 340 may be associated with the first AP, and the third STA 350 may be associated with the second AP. .

For example, the shared data according to an embodiment may be data to be shared by the first to third STAs and the first to second APs. For example, the shared data may be non-face-to-face order information and/or payment information. For example, the first to third STAs and the first to second APs may be terminals constituting a non-face-to-face ordering system, and the first to third STAs and the first to second APs place a non-face-to-face order. may share order information and/or payment information for For example, when the first STA transmits non-face-to-face order information to the first AP, the first AP may share the order information of the first STA to the second AP, the second STA, and the third STA. Or, for example, when the first STA transmits non-face-to-face payment information to the first AP, the first AP may share the payment information of the first STA to the second AP, the second STA, and the third STA. . For example, the second STA may require order information and/or payment information of the first STA, and the second STA may request order information of the first STA from the first AP, the second AP, and the third STA. and/or obtain payment information.

Hybrid automatic repeat request (HARQ) is a method of using a forward error correcting (FEC) technique and an automatic error request (ARQ) technique together. Unlike general automatic repeat request (ARQ), HARQ may additionally transmit information related to an FEC code capable of detecting an error. The receiving terminal may attempt error recovery through the FEC code, and when the error recovery fails, the receiving terminal may request retransmission from the transmitting terminal through ARQ. HARQ is used in standards such as high-speed downlink packet access (HSDPA), IEEE802.16e, and long term evolution (LTE), but HARQ has never been used in a contention-based wireless local area network (WLAN) environment. .

In extreme high throughput (EHT), a standard being discussed after IEEE802.11ax, the introduction of HARQ is being considered. When HARQ is introduced, coverage can be widened in a low signal to noise ratio (SNR) environment, that is, in an environment where the transmitting terminal and the receiving terminal are far apart, and higher throughput can be obtained in a high SNR environment. can

The receiving terminal receiving the HARQ retransmitted frame may perform decoding by combining the previously received original frame and the retransmitted frame. Here, it may be necessary to discuss the retransmission unit. HARQ retransmission may be performed in units of codewords at the PHY level, and HARQ retransmission may be performed in units of MPDUs at the MAC level.

Hereinafter, a hybrid automatic repeat request (HARQ) technique applied to an example of the present specification will be described. The terminal described below may be the apparatus of FIGS. 1 and/or 19 , and the PPDU may be the PPDU of FIG. 18 . The UE may be an AP or a non-AP STA.

The HARQ technique is a technique combining a forward error correction (FEC) scheme and an automatic repeat request (ARQ) scheme. According to the HARQ method, the physical layer checks whether the received data contains an error that cannot be decoded, and if an error occurs, the performance is improved by requesting retransmission.

The HARQ receiver basically attempts error correction on received data and determines whether to retransmit using an error detection code. The error detection code may be various codes. For example, in the case of using a cyclic redundancy check (CRC), when an error in received data is detected through a CRC detection process, the receiver transmits a non-acknowledgement (NACK) signal to the transmitter. Upon receiving the NACK signal, the transmitter transmits appropriate retransmission data according to the HARQ mode. The receiver receiving the retransmission data improves reception performance by combining and decoding the previous data and the retransmission data.

The mode of HARQ can be divided into chase combining and incremental redundancy (IR). Chase combining is a method of obtaining a signal-to-noise ratio (SNR) gain by combining data with error detected data with retransmitted data without discarding it. In the IR, additional redundant information is incrementally transmitted to retransmitted data to obtain a coding gain.

Chase combining is a method in which the same coded bit as in the initial transmission is retransmitted.

In the IR (incremental redundancy) method, the coded bit that is initially transmitted and subsequently retransmitted may be different as follows. Accordingly, when the IR method is used, the STA performing retransmission generally delivers the IR version (or packet version/retransmission version) to the receiving STA. In the following drawings, the transmitting STA is an example of performing retransmission in the order of IR version 1, IR Version 2, IR Version 3, and IR Version 1. The receiving STA may combine and decode the received packet/signal.

HARQ may have an effect of expanding coverage in a low SNR environment (eg, an environment in which a transmitting terminal and a receiving terminal are far apart). HARQ may have an effect of increasing throughput in a high SNR environment.

In order to perform HARQ, it is necessary to notify the transmitting terminal of a response (ie, acknowledgment (ACK) or negative acknowledgment (NACK)) to the data received from the receiving terminal. When receiving a response (eg, a block ack (BA) frame, etc.) to a plurality of HARQ units (eg, aggregated-MPDU (A-MPDU) including a plurality of MAC protocol data units (MPDU)) , the transmitting terminal may consider that an MPDU not included in the BA (block ACK) bitmap is a NACK, and the transmitting terminal performs various operations (eg, HARQ incremental redundancy (IR)) based on this. can do. However, if the receiving terminal successfully decodes the PHY header but fails to decode the S-MPDU (single-MPDU), or fails to decode all of the multiple HARQ units (eg, MPDU) due to an error, In the existing environment, the receiving terminal cannot transmit feedback on this. Therefore, the transmitting terminal cannot distinguish whether the transmitted PPDU has a collision or reception failure due to a channel error. That is, the transmitting terminal cannot know whether decoding of the PHY header succeeds in the receiving terminal but only the data decoding fails, or whether decoding of both the PHY header and the data fails.

The HARQ operation described below may refer to the HARQ IR technique.

4 is a flowchart illustrating an embodiment of a data sharing method for non-face-to-face ordering and payment.

Referring to FIG. 4 , the wireless LAN system of FIG. 4 may be the wireless LAN system of FIG. 3 .

The first STA may transmit a first physical protocol data unit (PPDU) including shared data to a first access point (AP) (S410). The first PPDU may include information on the STA list.

The shared data may be data to be shared by the first to third STAs and the first to second APs. For example, the shared data may be non-face-to-face order information and/or payment information. For example, the first to third STAs and the first to second APs may be terminals constituting a non-face-to-face ordering system, and the first to third STAs and the first to second APs place a non-face-to-face order. may share order information and/or payment information for For example, when the first STA transmits non-face-to-face order information to the first AP, the first AP may share the order information of the first STA to the second AP, the second STA, and the third STA. Or, for example, when the first STA transmits non-face-to-face payment information to the first AP, the first AP may share the payment information of the first STA to the second AP, the second STA, and the third STA. . For example, the second STA may require order information and/or payment information of the first STA, and the second STA may request order information of the first STA from the first AP, the second AP, and the third STA. and/or may obtain payment information.

The STA list may be determined based on channel state and capability information with the first STA. STAs having a good channel state with the first STA and matching capabilities may be included in the STA list. For example, STAs that have a channel quality indicator (CQI) value greater than or equal to a threshold value, support an extremely high throughput (EHT) wireless LAN system, support multi-link, and support HARQ are the STA list can be included in

Alternatively, the STA list may be determined based on a physical distance to the first STA measured based on a received signal strength indicator (RSSI) and a path loss value.

The STA list may include first to third STAs.

The first PPDU may include a PHY (physical) layer signal, an SIG field, a short training field (STF), and a long training field (LTF). The shared data may be a media access control (MAC) layer signal.

The first AP may transmit a second PPDU including the shared data to the second AP (S420). The first AP may also transmit shared data to the third STA. Since the third STA is an STA corresponding to an overlapping basic service set (OBSS) to the first AP, shared data may be transmitted directly from the first AP, or shared data may be transmitted to the third STA through the second AP. . That is, the second AP may transmit the shared data received from the first AP to the third STA. Alternatively, the first AP may receive information on the third STA from the second AP, and the first AP may directly transmit shared data to the third STA.

The first AP may transmit shared data and individual data to the second STA (S430). For example, the first AP may transmit a third PPDU including the shared data and the first individual data for the second STA to the second STA included in the STA list.

The third PPDU, the PPDU may include a SIG field, a short training field (STF), and a long training field (LTF) that are a PHY (physical) layer signal, and the shared data and the first individual data are MAC (media access control) ) may be a hierarchical signal.

The shared data transmitted by the first AP may be a first redundancy version of the shared data transmitted by the first STA.

The third PPDU may include a physical service data unit (PSDU), wherein the PSDU is continuous to first symbols and the first symbols including the first shared data, and the first shared It may include second symbols including data. The second symbols may be phase-shifted based on the first symbols.

The second AP may transmit shared data and individual data to the second STA (S440). For example, the first AP may transmit a fourth PPDU including the shared data and second individual data for the second STA to the second STA included in the STA list.

The fourth PPDU, the PPDU may include a SIG field, a short training field (STF), and a long training field (LTF), which are PHY (physical) layer signals, and the shared data and the second individual data are MAC (media access control) ) may be a hierarchical signal.

The shared data transmitted by the second AP may be a second redundancy version of the shared data transmitted by the first STA.

A coding rate of the first individual data may be set higher than a coding rate of the shared data transmitted by the first AP.

The coding rate of the second individual data may be set lower than the coding rate of the shared data transmitted by the second AP.

The third STA may transmit shared data to the second STA (S450). For example, the third STA may transmit the third redundancy version and the fourth redundancy version of the shared data in a broadcasting manner.

The second STA may receive the first to fourth redundancy versions of the shared data, and perform decoding by performing HARQ combining on the first to fourth redundancy versions.

For example, the second STA may perform decoding on the first received redundancy version among the first to fourth redundancy versions, and if decoding fails, the second STA may store the failed redundancy version in a buffer. Thereafter, when receiving a different redundancy version, the second STA may combine the redundancy version of the received signal stored in the buffer and the newly received redundancy version. For HARQ combining, an incremental redundacy (IR) technique may be used. Thereafter, a separate HARQ operation may be performed based on the NACK signal.

5 is a flowchart illustrating an embodiment of an STA operation in which a data sharing security method for non-face-to-face ordering and payment is performed.

Referring to FIG. 5 , the STA may share a security key with the AP (S500). For example, the STA may share a security key while performing association with the AP. For example, the security key may be included in an association request and/or an association response.

The STA may receive a first PPDU including first security information, shared data, and first individual data from a first access point (AP) ( S510 ).

The shared data may be data to be shared by the STA and the first to second APs. For example, the shared data may be non-face-to-face order information and/or payment information. For example, the STA and the first and second APs may be terminals constituting a non-face-to-face ordering system, and the STA and the first and second APs share order information and/or payment information for non-face-to-face ordering. can do. For example, the first AP may share non-face-to-face order information with the STA. Or, for example, the first AP may share non-face-to-face payment information with the STA. For example, the STA may require order information and/or payment information of the first and second APs, and the STA may obtain order information and/or payment information from the first AP and the second AP.

The STA may receive a second PPDU including the second security information, the shared data, and the second individual data from the second AP (S520).

The first and second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal.

The shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is the second of the shared data transmitted by the first STA. 2 May be a redundancy version.

A coding rate of the first individual data is set higher than a coding rate of shared data transmitted by the first AP, and the coding rate of the second individual data is transmitted by the second AP. It may be set lower than the coding rate of shared data.

The same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information is a first part of information necessary for descrambling the shared data. and the second security information may include a second portion of information necessary for descrambling the shared data.

That is, the first part and the second part are parts constituting information for descrambling the shared data, respectively, and by adding the first part and the second part, information for descrambling the shared data may be obtained.

The first part and the second part may be a value obtained by dividing bits of information necessary for descrambling the shared data in proportion to a coding rate value of the first individual data and a coding rate value of the second individual data.

6 is a diagram illustrating an embodiment of information required for descrambling shared data for non-face-to-face ordering and payment.

Referring to FIG. 6 , information necessary for descrambling shared data may be 10-bit information. For example, when the coding rate value of the first individual data is 2/5 and the coding rate value of the second individual data is 3/5, the first part may be '1001', and the second part may be '110001' ' can be That is, the first part and the second part may be a value obtained by distributing bits of information necessary for descrambling the shared data in proportion to the coding rate value of the first individual data and the coding rate value of the second individual data. have. Since the ratio of the coding rate is 2:3, 10-bit information can be distributed to the first part and the second part as 4-bit information and 6-bit information.

Here, the shared data according to an embodiment may be data to be shared by the STA and the first to second APs. For example, the shared data may be non-face-to-face order information and/or payment information. For example, the STA and the first and second APs may be terminals constituting a non-face-to-face ordering system, and the STA and the first and second APs share order information and/or payment information for non-face-to-face ordering. can do. For example, the first AP may share non-face-to-face order information with the STA. Or, for example, the first AP may share non-face-to-face payment information with the STA. For example, the STA may require order information and/or payment information of the first and second APs, and the STA may obtain order information and/or payment information from the first AP and the second AP.

Referring back to FIG. 5 , the first part and the second part are parts constituting information for descrambling shared data, respectively, and if the first part and the second part are combined, information for descrambling the shared data is obtained. can

Here, the information for descrambling the shared data may be scrambling before being divided into a first part and a second part. That is, the first part and the second part may be scrambled 'information for descrambling shared data'. Accordingly, in order for the STA to obtain information for descrambling the shared data, it is necessary to descramble information obtained by adding the first part and the second part.

A security key may be used to descramble information for descrambling shared data.

The security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key is required for descrambling the first part and the second part. It may be a hash value of information. That is, the security key may point to a specific value based on a preset hash function.

The STA may descramble the first part and the second part based on the security key value to obtain information necessary for descrambling the shared data (S530).

The STA may descramble the shared data using information necessary for descrambling the shared data obtained in S530 (S540).

The STA may decode the shared data, the first individual data, and the second individual data based on the first security information and the second security information (S550).

For example, another embodiment may operate as follows by combining the above-described embodiments. For example, the WLAN system includes a first STA, a second STA, a first AP, and a second AP, and the first STA provides the first AP with shared data including information related to ordering and payment; Transmits a first PPDU including information on the second STA as a destination STA, and the first AP transmits a second PPDU including the shared data and information on the second STA to the second AP and the first AP transmits a third PPDU including the shared data and the first individual data for the second STA to the second STA according to the information on the second STA, and the second AP transmits a fourth PPDU including the shared data and second individual data for the second STA to the second STA according to the information on the second STA, and the second STA, the first AP and decoding the shared data received from the second AP.

For example, the third PPDU further includes first security information, the fourth PPUD further includes second security information, and the second STA receives from the first AP and the second AP. The decoding of the shared data may include decoding the shared data based on the first security information and the second security information.

Or, for example, the first security information and the second security information may be a physical (PHY) layer signal, and the shared data, the first individual data, and the second individual data may be a media access control (MAC) layer signal. have.

Or, for example, the shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA, and the shared data transmitted by the second AP is transmitted by the first STA It may be a second redundancy version of one shared data.

Or, for example, the coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP, and the coding rate of the second individual data is the second 2 It may be set lower than the coding rate of the shared data transmitted by the AP.

Or, for example, the same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP, and the first security information descrambling the shared data. A first part of necessary information is included, and the second security information includes a second part of information needed for descrambling the shared data, and the STA and the first AP can exchange a security key (Key). have.

Or, for example, the security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA, and the security key includes the first part and the second It is a hash value of information necessary for descrambling a part, and the STA may descramble the shared data based on the first part, the second part, and the security key value.

In addition, it may be possible to further combine at least some of the above-described embodiments with the above operation.

The operation according to the embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all types of recording devices in which data readable by a computer system is stored. In addition, the computer-readable recording medium may be distributed in a network-connected computer system to store and execute computer-readable programs or codes in a distributed manner.

The technical features of the present specification may be implemented based on a CRM (computer readable medium). For example, CRM proposed by the present specification is at least one computer-readable recording medium ( In a computer readable medium), the steps of recognizing the faces of a plurality of persons included in the moving image, blurring the faces of the plurality of persons, and adding a list of the plurality of persons to the moving image Sorting based on the time the person was exposed, obtaining information related to the person from the user, the person being included in the plurality of persons, and removing the blur of the person's face It may store instructions for performing an operation to be performed. The instructions stored in the CRM of the present specification may be executed by at least one processor. At least one processor related to CRM in the present specification may be the processors 111 and 121 of FIG. 1 . Meanwhile, the CRM of the present specification may be the memories 112 and 122 of FIG. 3 or a separate external memory/storage medium/disk.

When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) that performs the above-described function. A module may be stored in a memory and executed by a processor. The memory may be internal or external to the processor, and may be coupled to the processor by various well-known means.

In addition, the computer-readable recording medium may include a hardware device specially configured to store and execute program instructions, such as ROM, RAM, and flash memory. The program instructions may include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

Although some aspects of the invention have been described in the context of an apparatus, it may also represent a description according to a corresponding method, wherein a block or apparatus corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also represent a corresponding block or item or a corresponding device feature. Some or all of the method steps may be performed by (or using) a hardware device such as, for example, a microprocessor, programmable computer or electronic circuit. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

In embodiments, a programmable logic device (eg, a field programmable gate array) may be used to perform some or all of the functions of the methods described herein. In embodiments, the field programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as described in the claims below. You will understand that it can be done.

Claims (11)

In a method performed in a wireless local area network (WLAN) system for non-face-to-face ordering and payment,
A first STA (station) sends a first access point (AP) a first physical protocol data unit (PPDU) including shared data including information related to ordering and payment and information on a second STA that is a destination STA transmitting;
transmitting, by the first AP, a second PPDU including the shared data and information on the second STA to the second AP;
transmitting, by the first AP, a third PPDU including the shared data and first individual data for the second STA to the second STA according to the information on the second STA;
transmitting, by the second AP, a fourth PPDU including the shared data and second individual data for the second STA to the second STA according to the information on the second STA; and
and decoding, by the second STA, the shared data received from the first AP and the second AP,
Way. The method according to claim 1,
The third PPDU further includes first security information,
The fourth PPUD further includes second security information,
Decoding, by the second STA, the shared data received from the first AP and the second AP,
Comprising the step of decoding the shared data based on the first security information and the second security information,
Way. 3. The method according to claim 2,
The first security information and the second security information are PHY (physical) layer signals,
The shared data, the first individual data and the second individual data are MAC (media access control) layer signals,
Way. The method according to claim 1,
The shared data transmitted by the first AP is a first redundancy version of the shared data transmitted by the first STA,
The shared data transmitted by the second AP is a second redundancy version of the shared data transmitted by the first STA,
Way. The method according to claim 1,
The coding rate of the first individual data is set higher than the coding rate of the shared data transmitted by the first AP,
The coding rate of the second individual data is set lower than the coding rate of the shared data transmitted by the second AP,
Way. 3. The method according to claim 2,
The same scrambling is applied to the shared data transmitted by the first AP and the shared data transmitted by the second AP,
The first security information includes a first portion of information necessary for descrambling the shared data,
the second security information includes a second portion of information necessary to descramble the shared data;
Further comprising the step of exchanging a security key (Key) by the STA and the first AP,
Way. 7. The method of claim 6,
The security key is determined based on a basic service set identifier (BSSID) of the first AP and an association ID (AID) of the STA;
the security key is a hash value of information required to descramble the first part and the second part;
The method further comprising: by the STA, descrambling the shared data based on the first part, the second part, and the security key value;
Way. 8. The method of claim 7,
The first part and the second part are information in which information necessary for descrambling the shared data is divided into bits according to a ratio between a coding rate value of the first individual data and a coding rate value of the second individual data,
Way. In a wireless local area network (WLAN) system for non-face-to-face ordering and payment,
The WLAN system includes a first STA (station), a second STA, a first access point (AP), and a second AP,
The first STA transmits, to the first AP, a first physical protocol data unit (PPDU) including shared data including information related to ordering and payment and information on the second STA, which is a destination STA,
The first AP transmits, to the second AP, a second PPDU including the shared data and information on the second STA;
The first AP transmits a third PPDU including the shared data and the first individual data for the second STA to the second STA according to the information on the second STA;
The second AP transmits, to the second STA according to the information on the second STA, a fourth PPDU including the shared data and second individual data for the second STA;
The second STA decodes the shared data received from the first AP and the second AP,
wireless LAN system. As a second STA (station) included in a wireless local area network (WLAN) system for non-face-to-face ordering and payment,
Receiving a third physical protocol data unit (PPUD) including shared data including information related to ordering and payment from a first access point (AP) and first individual data for the second STA,
receiving a fourth PPUD including the shared data and second individual data for the second STA from a second AP;
Decoding the shared data received from the first AP and the second AP,
The shared data is included in a first PPDU and transmitted from a first STA to the first AP, and the first PPDU further includes information on the second STA;
The shared data is included in a second PPDU and transmitted from the first AP to the second AP, and the second PPDI further includes information on the second STA.
second STA. As a first access point (AP) included in a wireless local area network (WLAN) system for non-face-to-face ordering and payment,
Receiving from the first STA (station) a first physical protocol data unit (PPDU) including shared data including information related to ordering and payment and information on a second STA that is a destination STA,
Transmitting a second PPDU including the shared data and information on the second STA to the second AP,
transmit a third PPDU including the shared data and first individual data for the second STA to the second STA based on the information on the second STA;
The shared data transmitted to the second STA is decoded by the second STA together with the shared data transmitted from the second AP based on information on the second STA,
The shared data transmitted from the second AP based on the information on the second STA is included in a fourth PPDU together with the second individual data for the second STA and transmitted from the second AP to the second STA felled,
first AP.

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