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WO2019022424A2 - Procédé de transmission ou de réception de trame dans un système lan sans fil et appareil associé - Google Patents

Procédé de transmission ou de réception de trame dans un système lan sans fil et appareil associé Download PDF

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Publication number
WO2019022424A2
WO2019022424A2 PCT/KR2018/008062 KR2018008062W WO2019022424A2 WO 2019022424 A2 WO2019022424 A2 WO 2019022424A2 KR 2018008062 W KR2018008062 W KR 2018008062W WO 2019022424 A2 WO2019022424 A2 WO 2019022424A2
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WIPO (PCT)
Prior art keywords
data
data rate
wur
sta
ppdu
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English (en)
Korean (ko)
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WO2019022424A3 (fr
Inventor
임동국
박은성
천진영
최진수
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a wireless LAN system, and more particularly, to a method and apparatus for transmitting or receiving a PPDU through a WAK (wake-up radio).
  • IEEE 802.11a and b 2.4. GHz or 5 GHz
  • the IEEE 802.11b provides a transmission rate of 11 Mbps
  • the IEEE 802.11a provides a transmission rate of 54 Mbps
  • IEEE 802.11g employs Orthogonal Frequency-Division Multiplexing (OFDM) at 2.4 GHz to provide a transmission rate of 54 Mbps
  • IEEE 802.11n employs multiple input multiple output (OFDM), or OFDM (MIMO-OFDM), and provides transmission speeds of 300 Mbps for four spatial streams.
  • IEEE 802.11n supports channel bandwidth up to 40 MHz, which in this case provides a transmission rate of 600 Mbps.
  • the IEEE 802.11ax standard which supports a maximum of 160 MHz bandwidth and supports 8 spatial streams and supports a maximum speed of 1 Gbit / s, has been discussed in the IEEE 802.11ax standard.
  • the present invention is not limited to the above-described technical problems, and other technical problems can be deduced from the embodiments of the present invention.
  • PPARU wake-up radio
  • WDU physical layer protocol data unit
  • WLAN wireless local area network
  • PP wake-up radio
  • PPDU physical layer protocol data unit
  • AP access point
  • WLAN wireless LAN
  • a station for receiving a wake-up radio (PPDU) physical layer protocol data unit
  • the apparatus comprising: a primary connectivity radio (PCR) transceiver; WUR receiver; Receiving data rate set information indicating a particular set of data rates among a plurality of data rate sets via the PCR transceiver, receiving a WUR PPDU including a WUR preamble and a data part via the WUR receiver, Set information and a data rate applied to a data part of the WUR PPDU based on the WUR preamble, each of the plurality of data rate sets including a plurality of data rates, the WUR preamble including And may indicate a data rate applied to the data part among a plurality of data rates included in the specific data rate set.
  • PCR primary connectivity radio
  • an access point (AP) for transmitting a wake-up radio (PPDU) physical layer protocol data unit comprising: a transceiver; And transmitting data rate set information indicating a specific data rate set among a plurality of data rate sets via a primary connectivity radio (PCR) through the transceiver, And a WUR PPDU including a WUR preamble, wherein each of the plurality of data rate sets includes a plurality of data rates, the WUR preamble including a plurality of data rates And may indicate a data rate applied to the data part of the plurality of data rates.
  • a wake-up radio (PPDU) physical layer protocol data unit comprising: a transceiver; And transmitting data rate set information indicating a specific data rate set among a plurality of data rate sets via a primary connectivity radio (PCR) through the transceiver, And a WUR PPDU including a WUR preamble, wherein each of the plurality of data rate sets includes a plurality of data rates, the WUR pream
  • Each of the plurality of data rate sets may comprise two data rates. If the WUR preamble corresponds to a first sequence, a lower data rate of the two data rates included in the particular data rate set may be applied to the data part. If the WUR preamble corresponds to a second sequence, a higher data rate of the two data rates included in the particular data rate set may be applied to the data part.
  • the Hamming distance of the first sequence and the second sequence may be 3, 5, or 7.
  • the plurality of data rate sets comprising a first data rate set comprising 62.5 kbps and 125 kbps; A second data rate set comprising 62.5 kbps and 250 kbps; A third data rate set comprising 125 kbps and 250 kbps; And a fourth set of data rates, including 250 kbps and 500 kbps.
  • the WUR preamble may include a synchronization sequence for synchronization with the WUR PPDU.
  • the WUR preamble may further include a signal (SIG) field and a signature sequence.
  • SIG field may include length information of the WUR PPDU determined in consideration of a data rate applied to the data part, and format information indicating whether the WUR PPDU is a unicast format, a multicast format, or a broadcast format have.
  • the signature sequence may indicate a data rate applied to the data part.
  • the WUR preamble when there are a plurality of sets of data rates available, is set to indicate the data rate only within a predetermined set of data rates through PCR, so that even if various data rates are supported
  • the WUR signaling overhead for data rate indication can be minimized.
  • FIG. 1 is a diagram showing an example of a configuration of a wireless LAN system.
  • FIG. 2 is a diagram showing another example of the configuration of the wireless LAN system.
  • 3 is a diagram for explaining a general link setup process.
  • FIG. 4 is a diagram for explaining a backoff process.
  • 5 is a diagram for explaining hidden nodes and exposed nodes.
  • 6 is a diagram for explaining RTS and CTS.
  • 7 to 9 are diagrams for explaining the operation of the STA that has received the TIM.
  • FIG. 10 is a diagram for explaining an example of a frame structure used in the IEEE 802.11 system.
  • FIG. 11 is a diagram for explaining a WUR receiver usable in a wireless LAN system (e.g., 802.11).
  • FIG. 13 shows an example of a WUR packet.
  • FIG. 14 illustrates a waveform for a WUR packet.
  • 15 is a diagram for explaining a WUR packet generated using an OFDM transmitter of a wireless LAN.
  • Figure 16 illustrates the structure of a WUR receiver.
  • FIG. 17 shows a WUR PPDU format according to an embodiment of the present invention.
  • FIG. 18 is a view for explaining a PPDU information part according to an embodiment of the present invention.
  • FIG. 19 shows a case where a PPDU info part is composed of a signature sequence + SIG field according to an embodiment of the present invention.
  • FIG. 20 shows a case where a PPDU Info Part is composed of a SIG field + signature sequence according to an embodiment of the present invention.
  • Figure 21 illustrates the structure of a WUR preamble part for repeated transmission of a PPDU information part in accordance with an embodiment of the present invention.
  • FIG. 22 shows a flow of a WUR PPDU transmission / reception method according to an embodiment of the present invention.
  • 23 is a view for explaining an apparatus according to an embodiment of the present invention.
  • the following description relates to a method and apparatus for efficiently utilizing a channel having a wide bandwidth in a wireless LAN system.
  • a wireless LAN system to which the present invention is applied will be described in detail.
  • FIG. 1 is a diagram showing an example of a configuration of a wireless LAN system.
  • a WLAN system includes one or more Basic Service Sets (BSSs).
  • BSS is a collection of stations (STAs) that can successfully communicate and synchronize with each other.
  • the STA is a logical entity including a medium access control (MAC) and a physical layer interface for a wireless medium.
  • the STA includes an access point (AP) and a non-AP STA (Non-AP Station) .
  • a portable terminal operated by a user in the STA is a non-AP STA, and sometimes referred to as a non-AP STA.
  • the non-AP STA may be a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, May also be referred to as another name such as a Mobile Subscriber Unit.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • mobile terminal May also be referred to as another name such as a Mobile Subscriber Unit.
  • An AP is an entity that provides a connection to a distribution system (DS) via a wireless medium to an associated station (STA).
  • the AP may be referred to as a centralized controller, a base station (BS), a Node-B, a base transceiver system (BTS), a site controller, or the like.
  • the BSS can be divided into an infrastructure BSS and an independent BSS (IBSS).
  • IBSS independent BSS
  • the BBS shown in FIG. 1 is an IBSS.
  • the IBSS means a BSS that does not include an AP, and does not include an AP, so a connection to the DS is not allowed and forms a self-contained network.
  • FIG. 2 is a diagram showing another example of the configuration of the wireless LAN system.
  • the BSS shown in FIG. 2 is an infrastructure BSS.
  • the infrastructure BSS includes one or more STAs and APs.
  • communication between non-AP STAs is performed via an AP, but direct communication between non-AP STAs is possible when a direct link is established between non-AP STAs.
  • a plurality of infrastructure BSSs may be interconnected via DS.
  • a plurality of BSSs connected through a DS are referred to as an extended service set (ESS).
  • the STAs included in the ESS can communicate with each other, and within the same ESS, the non-AP STA can move from one BSS to another while seamlessly communicating.
  • the DS is a mechanism for connecting a plurality of APs. It is not necessarily a network, and there is no limitation on the form of DS if it can provide a predetermined distribution service.
  • the DS may be a wireless network such as a mesh network, or may be a physical structure that links APs together.
  • the operation of the STA operating in the wireless LAN system can be described in terms of the layer structure.
  • the hierarchy can be implemented by a processor.
  • the STA may have a plurality of hierarchical structures.
  • the hierarchical structure covered in the 802.11 standard document is mainly a MAC sublayer and a physical (PHY) layer on a DLL (Data Link Layer).
  • the PHY may include a Physical Layer Convergence Procedure (PLCP) entity, a PMD (Physical Medium Dependent) entity, and the like.
  • the MAC sublayer and the PHY conceptually include management entities called a MAC sublayer management entity (MLME) and a physical layer management entity (PLME), respectively. These entities provide a layer management service interface in which a layer management function operates .
  • MLME MAC sublayer management entity
  • PLME physical layer management entity
  • SME Station Management Entity
  • An SME is a layer-independent entity that may be present in a separate management plane or may appear to be off-the-side. Although the exact functions of the SME are not described in detail in this document, they generally include the ability to collect layer-dependent states from various Layer Management Entities (LMEs) and to set similar values for layer-specific parameters It can be seen as responsible.
  • LMEs Layer Management Entities
  • An SME typically performs these functions on behalf of a generic system management entity and can implement a standard management protocol.
  • the aforementioned entities interact in various ways. For example, they can interact by exchanging GET / SET primitives between entities.
  • a primitive is a set of elements or parameters related to a specific purpose.
  • the XX-GET.request primitive is used to request the value of a given MIB attribute.
  • the XX-GET.confirm primitive returns the appropriate MIB attribute information value if the Status is "Success", otherwise it is used to return an error indication in the Status field.
  • the XX-SET.request primitive is used to request that the indicated MIB attribute be set to the given value. If the MIB attribute indicates a specific operation, it is requested that the corresponding operation be performed.
  • the XX-SET.confirm primitive confirms that the indicated MIB attribute is set to the requested value if the status is "success", otherwise it is used to return an error condition to the status field. If the MIB attribute indicates a specific operation, this confirms that the corresponding operation has been performed.
  • MLME and SME can exchange various MLME_GET / SET primitives through MLME_SAP (Service Access Point).
  • various PLME_GET / SET primitives can be exchanged between PLME and SME via PLME_SAP and exchanged between MLME and PLME through MLME-PLME_SAP.
  • 3 is a diagram for explaining a general link setup process.
  • the STA In order for a STA to set up a link to a network and transmit and receive data, the STA first discovers a network, performs authentication, establishes an association, establishes an authentication procedure for security, .
  • the link setup process may be referred to as a session initiation process or a session setup process. Also, the process of discovery, authentication, association, and security setting of the link setup process may be collectively referred to as an association process.
  • the STA can perform a network discovery operation.
  • the network discovery operation may include a scanning operation of the STA. In other words, in order for the STA to access the network, it must find a network that can participate. The STA must identify a compatible network before joining the wireless network. The process of identifying a network in a specific area is called scanning.
  • the scanning methods include active scanning and passive scanning.
  • FIG. 3 illustrates a network discovery operation that includes an exemplary active scanning process.
  • the STA performing the scanning in the active scanning transmits the probe request frame and waits for a response in order to search for the existence of an AP in the surroundings while moving the channels.
  • the responder sends a probe response frame in response to the probe request frame to the STA that transmitted the probe request frame.
  • the responder may be the STA that last transmitted the beacon frame in the BSS of the channel being scanned.
  • the AP transmits the beacon frame, so the AP becomes the responder.
  • the STAs in the IBSS transmit the beacon frame while the beacon frame is transmitted.
  • the STA that transmits the probe request frame in channel 1 and receives the probe response frame in channel 1 stores the BSS-related information included in the received probe response frame and transmits the next channel (for example, Channel) and perform scanning in the same manner (i.e., transmitting / receiving a probe request / response on the second channel).
  • the next channel for example, Channel
  • the scanning operation may be performed in a passive scanning manner.
  • the STA performing the scanning waits for the beacon frame while moving the channels.
  • a beacon frame is one of the management frames in IEEE 802.11, and is transmitted periodically to notify the presence of a wireless network and allow the STA performing the scanning to find the wireless network and participate in the wireless network.
  • the AP periodically transmits the beacon frame.
  • the beacon frames are transmitted while the STAs in the IBSS are running.
  • the scanning STA stores information on the BSS included in the beacon frame and records beacon frame information on each channel while moving to another channel.
  • the STA receiving the beacon frame stores the BSS-related information included in the received beacon frame, moves to the next channel, and performs scanning in the next channel in the same manner.
  • active scanning has the advantage of less delay and less power consumption than passive scanning.
  • the authentication procedure may be performed in step S520.
  • This authentication process can be referred to as a first authentication process in order to clearly distinguish from the security setup operation in step S540 described later.
  • the authentication process includes an STA transmitting an authentication request frame to the AP, and an AP transmitting an authentication response frame to the STA in response to the authentication request frame.
  • the authentication frame used for the authentication request / response corresponds to the management frame.
  • the authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a robust security network (RSN), a finite cyclic group Group), and the like. This corresponds to some examples of information that may be included in the authentication request / response frame, may be replaced by other information, or may include additional information.
  • RSN robust security network
  • the STA may send an authentication request frame to the AP. Based on the information included in the received authentication request frame, the AP can determine whether or not to allow authentication for the STA. The AP can provide the result of the authentication process to the STA through the authentication response frame.
  • the association process includes an STA transmitting an association request frame to an AP, and an AP transmitting an association response frame to the STA in response to the association request frame.
  • the association request frame may include information related to various capabilities, a listening interval, a service set identifier (SSID), supported rates, supported channels, an RSN, , Supported operating classes, TIM broadcast request, interworking service capability, and the like.
  • SSID service set identifier
  • the association response frame may include information related to various capabilities, a status code, an association ID (AID), a support rate, an enhanced distributed channel access (EDCA) parameter set, a Received Channel Power Indicator (RCPI) A timeout interval (an association comeback time), a overlapping BSS scan parameter, a TIM broadcast response, a QoS map, and the like.
  • AID association ID
  • EDCA enhanced distributed channel access
  • RCPI Received Channel Power Indicator
  • a timeout interval an association comeback time
  • overlapping BSS scan parameter a overlapping BSS scan parameter
  • a TIM broadcast response a QoS map, and the like.
  • association request / response frame may be replaced by other information, or may include additional information.
  • a security setup procedure may be performed at step S540.
  • the security setup process in step S540 may be referred to as an authentication process through a Robust Security Network Association (RSNA) request / response.
  • the authentication process in step S520 may be referred to as a first authentication process, May also be referred to simply as an authentication process.
  • RSNA Robust Security Network Association
  • the security setup process of step S540 may include a private key setup through 4-way handshaking over an Extensible Authentication Protocol over LAN (EAPOL) frame, for example .
  • the security setup process may be performed according to a security scheme not defined in the IEEE 802.11 standard.
  • the basic access mechanism of Medium Access Control is a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism.
  • the CSMA / CA mechanism is also referred to as the Distributed Coordination Function (DCF) of the IEEE 802.11 MAC, which basically adopts a "listen before talk" access mechanism.
  • DCF Distributed Coordination Function
  • the AP and / or the STA may sense a radio channel or medium for a predetermined time interval (e.g., DCF Inter-Frame Space (DIFS) If the medium is judged to be in an idle status, the frame transmission is started through the corresponding medium, whereas if the medium is occupied status, The AP and / or the STA does not start its own transmission but sets a delay period (for example, a random backoff period) for the medium access and waits for a frame transmission after waiting With the application of an arbitrary backoff period, several STAs are expected to attempt frame transmission after waiting for different time periods, so that collisions can be minimized.
  • a delay period for example, a random backoff period
  • the IEEE 802.11 MAC protocol provides HCF (Hybrid Coordination Function).
  • the HCF is based on the DCF and the PCF (Point Coordination Function).
  • the PCF is a polling-based, synchronous access scheme that refers to periodically polling all receiving APs and / or STAs to receive data frames.
  • HCF has EDCA (Enhanced Distributed Channel Access) and HCCA (HCF Controlled Channel Access).
  • EDCA is a contention-based access method for a provider to provide data frames to a large number of users, and HCCA uses a contention-based channel access method using a polling mechanism.
  • the HCF includes a medium access mechanism for improving QoS (Quality of Service) of the WLAN, and can transmit QoS data in both a contention period (CP) and a contention free period (CFP).
  • QoS Quality of Service
  • FIG. 4 is a diagram for explaining a backoff process.
  • An operation based on an arbitrary backoff period will be described with reference to FIG.
  • STAs may attempt to transmit data (or frames).
  • each of the STAs may attempt to transmit after selecting an arbitrary backoff count and waiting for a corresponding slot time.
  • An arbitrary backoff count has a packet number value and can be determined to be one of values in the range of 0 to CW.
  • CW is a contention window parameter value.
  • the CW parameter is given an initial value of CWmin, but it can take a value twice in the case of a transmission failure (for example, in the case of not receiving an ACK for a transmitted frame).
  • the CW parameter value is CWmax
  • the data transmission can be attempted while maintaining the CWmax value until the data transmission is successful. If the data transmission is successful, the CWmin value is reset to the CWmin value.
  • the STA When an arbitrary backoff process is started, the STA continuously monitors the medium while counting down the backoff slot according to the determined backoff count value. When the medium is monitored in the occupied state, the countdown is stopped and waited, and when the medium is idle, the remaining countdown is resumed.
  • the STA3 when a packet to be transmitted to the MAC of the STA3 arrives, the STA3 can confirm that the medium is idle by DIFS and transmit the frame immediately. Meanwhile, the remaining STAs monitor and wait for the medium to be in a busy state. In the meanwhile, data to be transmitted may also occur in each of STA1, STA2 and STA5, and each STA waits for DIFS when the medium is monitored in an idle state and then counts down the backoff slot according to the arbitrary backoff count value selected by each STA. Can be performed. In the example of FIG. 4, STA2 selects the smallest backoff count value, and STA1 selects the largest backoff count value.
  • the remaining backoff time of the STA5 is shorter than the remaining backoff time of the STA1 at the time when the STA2 finishes the backoff count and starts the frame transmission.
  • STA1 and STA5 stop countdown and wait for a while while STA2 occupies the medium.
  • STA1 and STA5 wait for DIFS and then resume the stopped backoff count. That is, the frame transmission can be started after counting down the remaining backoff slots by the remaining backoff time. Since the remaining backoff time of STA5 is shorter than STA1, STA5 starts frame transmission.
  • data to be transmitted may also occur in the STA 4 while the STA 2 occupies the medium.
  • STA4 if the medium becomes idle, it can wait for DIFS, count down according to an arbitrary backoff count value selected by the STA4, and start frame transmission.
  • the remaining backoff time of STA5 coincides with the arbitrary backoff count value of STA4, in which case a collision may occur between STA4 and STA5. If a collision occurs, neither STA4 nor STA5 receive an ACK, and data transmission fails. In this case, STA4 and STA5 can double the CW value, then select an arbitrary backoff count value and perform a countdown.
  • the STA1 waits while the medium is occupied due to the transmission of the STA4 and the STA5, waits for the DIFS when the medium becomes idle, and starts frame transmission after the remaining backoff time.
  • the CSMA / CA mechanism includes virtual carrier sensing in addition to physical carrier sensing in which the AP and / or STA directly senses the medium.
  • Virtual carrier sensing is intended to compensate for problems that may occur in media access, such as hidden node problems.
  • the MAC of the wireless LAN system may use a network allocation vector (NAV).
  • NAV network allocation vector
  • the value set to NAV corresponds to the period in which the medium is scheduled to be used by the AP and / or the STA that transmits the frame, and the STA receiving the NAV value is prohibited from accessing the medium during the corresponding period.
  • the NAV may be set according to the value of the " duration " field of the MAC header of the frame, for example.
  • 5 is a diagram for explaining hidden nodes and exposed nodes.
  • FIG. 5A is an example of a hidden node, and STA A and STA B are in communication and STA C has information to be transmitted. Specifically, STA A is transmitting information to STA B, but it can be determined that STA C is idle when performing carrier sensing before sending data to STA B. This is because the STA A transmission (ie, media occupancy) may not be sensed at the STA C location. In this case, STA B receives information of STA A and STA C at the same time, so that collision occurs. In this case, STA A is a hidden node of STA C.
  • FIG. 5B is an example of an exposed node
  • STA B is a case of transmitting data to STA A
  • STA C has information to be transmitted in STA D.
  • FIG. 5B if the STA C carries out the carrier sensing, it can be determined that the medium is occupied due to the transmission of the STA B. Accordingly, even if STA C has information to be transmitted to STA D, it is sensed that the media is occupied, and therefore, it is necessary to wait until the medium becomes idle.
  • the STA A is actually out of the transmission range of the STA C, the transmission from the STA C and the transmission from the STA B may not collide with each other in the STA A. Therefore, the STA C is not necessary until the STA B stops transmitting It is to wait.
  • STA C can be regarded as an exposed node of STA B.
  • 6 is a diagram for explaining RTS and CTS.
  • short signaling packets such as RTS (request to send) and CTS (clear to send) can be used in order to efficiently use the collision avoidance mechanism.
  • the RTS / CTS between the two STAs may allow the surrounding STA (s) to overhear, allowing the surrounding STA (s) to consider whether to transmit information between the two STAs. For example, if the STA to which data is to be transmitted transmits an RTS frame to the STA receiving the data, the STA receiving the data can notify that it will receive the data by transmitting the CTS frame to surrounding STAs.
  • FIG. 6A is an example of a method for solving a hidden node problem, and it is assumed that both STA A and STA C attempt to transmit data to STA B.
  • FIG. 6A When STA A sends RTS to STA B, STA B transmits CTS to both STA A and STA C around it. As a result, STA C waits until the data transmission of STA A and STA B is completed, thereby avoiding collision.
  • 6 (b) is an illustration of a method for solving the exposed node problem, where STA C overrides the RTS / CTS transmission between STA A and STA B, D, the collision does not occur. That is, STA B transmits RTS to all surrounding STAs, and only STA A having data to be transmitted transmits CTS. Since STA C only receives RTS and does not receive CTS of STA A, it can be seen that STA A is outside the carrier sensing of STC C.
  • the STA in the wireless LAN system, the STA must perform channel sensing before performing transmission / reception, and always sensing the channel causes continuous power consumption of the STA.
  • the power consumption in the reception state does not differ much from the power consumption in the transmission state, and maintaining the reception state is also a large burden on the STA which is limited in power (that is, operated by the battery).
  • the wireless LAN system supports the power management (PM) mode of the STA.
  • the STA's power management mode is divided into an active mode and a power save (PS) mode.
  • STA basically operates in active mode.
  • An STA operating in active mode maintains an awake state.
  • the awake state is a state in which normal operation such as frame transmission / reception and channel scanning is possible.
  • the STA operating in the PS mode operates by switching between a sleep state (or a doze state) and an awake state.
  • the STA operating in the sleep state operates with minimal power and does not perform frame scanning nor transmission and reception of frames.
  • the STA sleeps for as long as possible, power consumption is reduced, which increases the operating time of the STA.
  • it since it is impossible to transmit / receive frames in the sleep state, it can not be operated unconditionally for a long time. If the STA operating in the sleep state exists in the frame to be transmitted to the AP, it can switch to the awake state and transmit the frame. On the other hand, when there is a frame to be transmitted to the STA by the AP, the STA in the sleep state can not receive it, and it is unknown that there is a frame to receive. Therefore, the STA may need to switch to the awake state according to a certain period to know whether there is a frame to be transmitted to it (and to receive it if it exists).
  • the AP may transmit a beacon frame to the STAs in the BSS at regular intervals.
  • the beacon frame may include a Traffic Indication Map (TIM) information element.
  • the TIM information element may include information that indicates that the AP has buffered traffic for the STAs associated with it and will transmit the frame.
  • the TIM element includes a TIM used for indicating a unicast frame and a delivery traffic indication map (DTIM) used for indicating a multicast or broadcast frame.
  • DTIM delivery traffic indication map
  • FIG. 7 to 9 are views for explaining the operation of the STA receiving the TIM in detail.
  • the STA in order to receive a beacon frame including a TIM from an AP, the STA changes from a sleep state to an awake state, and analyzes the received TIM element to find that there is buffered traffic to be transmitted to the STA .
  • the STA may transmit a PS-Poll frame to request AP to transmit data frame.
  • the AP receiving the PS-Poll frame transmitted by the STA can transmit the frame to the STA.
  • the STA may receive a data frame and send an acknowledgment (ACK) frame to the AP.
  • ACK acknowledgment
  • the AP operates according to an immediate response scheme for transmitting a data frame after a predetermined time (for example, SIFS (Short Inter-Frame Space)) after receiving the PS-Poll frame from the STA .
  • a predetermined time for example, SIFS (Short Inter-Frame Space)
  • the AP can operate according to a deferred response method, which will be described with reference to FIG.
  • the operation of switching the STA from the sleep state to the awake state, receiving the TIM from the AP, competing, and transmitting the PS-Poll frame to the AP is the same as the example of FIG.
  • the AP receives the PS-Poll frame and fails to prepare the data frame for SIFS, it can send an ACK frame to the STA instead of transmitting the data frame.
  • the AP transmits the ACK frame and the data frame is ready, it can transmit the data frame to the STA after performing the contention.
  • the STA transmits an ACK frame indicating that the data frame has been successfully received to the AP, and can be switched to the sleep state.
  • Figure 9 is an example of an AP transmitting a DTIM.
  • STAs may transition from the sleep state to the awake state to receive a beacon frame containing the DTIM element from the AP.
  • STAs can know that a multicast / broadcast frame will be transmitted through the received DTIM.
  • the AP can transmit data (i.e., multicast / broadcast frame) directly without transmitting / receiving a PS-Poll frame after transmitting a beacon frame including DTIM.
  • the STAs may receive data while continuing to hold the awake state after receiving the beacon frame including the DTIM, and may switch to the sleep state again after the data reception is completed.
  • FIG. 10 is a diagram for explaining an example of a frame structure used in the IEEE 802.11 system.
  • the Physical Layer Protocol Data Unit (PPDU) frame format may include a Short Training Field (STF) field, a Long Training Field (LTF) field, a SIGN (SIGNAL) field, and a Data field.
  • STF Short Training Field
  • LTF Long Training Field
  • SIGNAL SIGNAL
  • Data field e.g., Data field
  • the most basic (e.g., non-HT (High Throughput)) PPDU frame format may consist of L-STF (Legacy-STF), L-LTF (Legacy-LTF), SIG field and data field only.
  • STF is a signal for signal detection, AGC (Automatic Gain Control), diversity selection, precise time synchronization, etc.
  • LTF is a signal for channel estimation and frequency error estimation.
  • STF and LTF may be collectively referred to as a PLCP preamble, and the PLCP preamble may be a signal for synchronization and channel estimation of the OFDM physical layer.
  • the SIG field may include a RATE field and a LENGTH field.
  • the RATE field may contain information on the modulation and coding rate of the data.
  • the LENGTH field may contain information on the length of the data. Additionally, the SIG field may include a parity bit, a SIG TAIL bit, and the like.
  • the data field may include a SERVICE field, a physical layer service data unit (PSDU), a PPDU TAIL bit, and may also include a padding bit if necessary.
  • Some bits in the SERVICE field may be used for synchronization of the descrambler at the receiving end.
  • the PSDU corresponds to an MPDU (MAC Protocol Data Unit) defined in the MAC layer and may include data generated / used in an upper layer.
  • the PPDU TAIL bit can be used to return the encoder to the 0 state.
  • the padding bits may be used to match the length of the data field to a predetermined unit.
  • the MPDU is defined according to various MAC frame formats, and the basic MAC frame is composed of a MAC header, a frame body, and a frame check sequence (FCS).
  • the MAC frame is composed of MPDUs and can be transmitted / received via the PSDU of the data part of the PPDU frame format.
  • the MAC header includes a Frame Control field, a Duration / ID field, an Address field, and the like.
  • the frame control field may contain control information necessary for frame transmission / reception.
  • the period / ID field may be set to a time for transmitting the frame or the like.
  • the period / ID field included in the MAC header can be set to a 16-bit length (e.b., B0 to B15).
  • the content included in the period / ID field may vary depending on the frame type and subtype, whether it is transmitted during the contention free period (CFP), the QoS capability of the transmitting STA, and the like.
  • the period / ID field may contain the AID of the transmitting STA (e.g., via 14 LSB bits) and 2 MSB bits may be set to one.
  • the duration / ID field may be set to a fixed value (e.g., 32768).
  • the duration / ID field may include a duration value defined for each frame type.
  • the specific contents of the Sequence Control, QoS Control, and HT Control subfields of the MAC header can refer to the IEEE 802.11 standard document.
  • the frame control field of the MAC header may include Protocol Version, Type, Subtype, To DS, From DS, More Fragment, Retry, Power Management, More Data, Protected Frame, Order subfields.
  • the contents of each subfield of the frame control field may reference an IEEE 802.11 standard document.
  • WURx wake-up radio receiver
  • the STA includes a primary connectivity radio (PCR) (eg, IEEE 802.11a / b / g / n / ac / ax wireless LAN) and a wake- WUR) (eg, IEEE 802.11ba).
  • PCR primary connectivity radio
  • WUR wake- WUR
  • the PCR is used for data transmission and reception, and can be turned off when there is no data to be transmitted or received.
  • the WURx of the STA can wake up the PCR when there is a packet to be received. Therefore, user data is transmitted and received through PCR.
  • WURx is not used for user data, but can only wake up the PCR transceiver.
  • WURx can be in the form of a simple receiver without a transmitter and is active while PCR is off.
  • the target power consumption of WURx in the active state preferably does not exceed 100 microW (uW).
  • a simple modulation scheme such as an on-off keying (OOK) scheme can be used, and a narrow bandwidth (e.g., 4 MHz, 5 MHz) can be used.
  • the coverage range (e.g., distance) to which WURx is targeted may currently be equivalent to 802.11.
  • a WUR packet may include a PCR part 1200 and a WUR part 1205.
  • the PCR part 1200 is for coexistence with a legacy WLAN system, and the PCR part may be referred to as a wireless LAN preamble. At least one or more of the L-STF, L-LTF, and L-SIG of the legacy wireless LAN may be included in the PCR part 1200 to protect WUR packets from other PCR STAs. Accordingly, the 3rd party legacy STA can know that the WUR packet is not intended for itself through the PCR part 1200 of the WUR packet, but the medium of the PCR is occupied by another STA. However, WURx does not decode the PCR part of the WUR packet. This is because WURx that supports narrowband and OOK demodulation does not support the reception of PCR signals.
  • At least a portion of the WUR part 1205 may be modulated in an on-off keying (OOK) manner.
  • the WUR part may include at least one of a WUR preamble, a MAC header (e.g., a recipient address, etc.), a frame body, and a frame check sequence (FCS).
  • OOK modulation may be performed by modifying the OFDM transmitter.
  • WURx 1210 consumes very little power, less than 100 uW, as described above, and can be implemented with a small and simple OOK demodulator.
  • the WUR packet since the WUR packet needs to be designed to be compatible with the WLAN system, the WUR packet includes a preamble (eg, OFDM scheme) of a legacy wireless LAN and a new LP-WUR signal waveform (eg, OOK scheme) can do.
  • a preamble eg, OFDM scheme
  • a new LP-WUR signal waveform eg, OOK scheme
  • the WUR packet of FIG. 13 shows an example of a WUR packet.
  • the WUR packet of FIG. 13 includes a PCR part (e.g., a legacy wireless LAN preamble) for coexistence with a legacy STA.
  • a PCR part e.g., a legacy wireless LAN preamble
  • the legacy wireless LAN preamble may include L-STF, L-LTF, and L-SIG.
  • the wireless LAN STA eg, 3rd party
  • the L-SIG field may indicate the length of the payload of the WUR packet (e.g., OOK modulated).
  • the WUR part may include at least one of a WUR preamble, a MAC header, a frame body, and an FCS.
  • the WUR preamble may include, for example, a PN sequence.
  • the MAC header may include a receiver address.
  • the frame body may contain other information needed for wake-up.
  • the FCS may include a cyclic redundancy check (CRC).
  • FIG. 14 illustrates a waveform for the WUR packet of FIG. Referring to Fig. 14, in the OOK modulated WUR part, one bit can be transmitted per 1 OFDM symbol length (e.g., 4 usec). Thus, the data rate of the WUR part may be 250 kbps.
  • FIG. 15 is a diagram for explaining generation of a WUR packet using an OFDM transmitter of a wireless LAN.
  • a phase shift keying (PSK) -OFDM transmission scheme is used.
  • PSK phase shift keying
  • generating a WUR packet by adding a separate OOK modulator for OOK modulation increases the implementation cost of the transmitter. Therefore, a method of generating an OOK modulated WUR packet by reusing an OFDM transmitter will be described.
  • a bit value 1 is a symbol (ie, on) having any power in a symbol or having a power equal to or higher than a threshold value
  • a bit value 0 is a symbol having no power in a symbol, (i.e., off).
  • the bit value 1 it is also possible to define the bit value 1 as the power off.
  • the bit value 1/0 is indicated on / off of the power at the corresponding symbol position.
  • This simple OOK modulation / demodulation scheme has the advantage of reducing the power consumed in signal detection / demodulation of the receiver and the cost for implementing it.
  • OOK modulation to turn signals on and off may be performed by reusing existing OFDM transmitters.
  • the left graph of FIG. 15 shows the real part and the imaginary part of the normalized amplitude for one symbol period (eg, 4 usec) for the OOK modulated bit value 1 by reusing the OFDM transmitter of the existing wireless LAN. lt; / RTI > shows an imaginary part.
  • the OOK modulation result for the bit value 0 corresponds to the power off, so that the illustration is omitted.
  • the right graph of FIG. 15 shows normalized power spectral density (PSD) on the frequency domain for the OOK modulated bit value 1 by reusing the OFDM transmitter of the existing wireless LAN.
  • PSD power spectral density
  • center 4 MHz in the band may be used for WUR.
  • WUR operates at a 4 MHz bandwidth, but this is for convenience of explanation, and frequency bandwidths of different sizes may be used.
  • the subcarrier spacing (e.g., subcarrier spacing) is 312.5 kHz and the bandwidth of the OOK pulse corresponds to 13 subcarriers.
  • a CP cyclic prefix
  • the WUR packet may be referred to as a WUR signal, a WUR frame, or a WUR PPDU.
  • the WUR packet may be a packet for broadcast / multicast (e.g., a WUR beacon) or a packet for unicast (e.g., a packet for waking up and awakening the WUR mode of a particular WUR STA).
  • FIG. 16 illustrates the structure of a WURx (WUR receiver).
  • WURx may include a RF / analog front-end, a digital baseband processor, and a simple packet parser. 16 is an exemplary configuration, and the WUR receiver of the present invention is not limited to Fig.
  • a WLAN STA with a WUR receiver is briefly referred to as a WUR STA.
  • the WUR STA may be referred to briefly as the STA.
  • Manchester coding may be used for OOK symbol generation.
  • 1-bit information is indicated via two sub-information (or two coded bits).
  • 2-bit information '0' passes through Manchester coding
  • two lower information bits '10' i.e., On-Off
  • 2-bit information '1' passes Manchester coding
  • two lower information bits '01' i.e., Off-On
  • the On-Off order of the lower information bits may be reversed according to the embodiment.
  • the 1 OOK symbol corresponds to 3.2 us in the time domain and corresponds to K subcarriers in the frequency domain, but the present invention is not limited thereto.
  • the OOK symbol length is (i) 1.6 us for the first lower information bit '1' And 1.6 us for the second lower information bit '0'.
  • the signal corresponding to the first lower information bit '1' maps ⁇ to odd-numbered subcarriers among K subcarriers, maps 0 to even-numbered subcarriers, performs IFFT .
  • a periodic signal of 1.6 us is repeated twice in the time domain.
  • the first or second signal of the 1.6 us periodic signal repeated twice may be used as a signal corresponding to the first lower information bit '1'.
  • ⁇ is a power normalization factor, for example, 1 / sqrt (ceil (K / 2)).
  • consecutive K subcarriers used for signal generation corresponding to the first lower information bit '1' of the total 64 subcarriers are, for example, [33-floor (K / 2): 33 + ceil (K / 2) -1].
  • the signal corresponding to the second lower information bit '0' may be obtained by mapping 0 to K subcarriers and performing IFFT. For example, consecutive K subcarriers used for signal generation corresponding to the second lower information bit '0' of the total 64 subcarriers (ie, the 20 MHz band) are [33-floor (K / 2): 33 + ceil (K / 2) -1].
  • the OOK symbol for the 1-bit information '1' may be obtained by placing a signal corresponding to the lower information bit '1' after the signal corresponding to the lower information bit '0'.
  • one symbol length for WUR may be set to be smaller than 3.2 us.
  • one symbol may be set to information + CP of 1.6us, 0.8us or 0.4us.
  • a time domain signal can be obtained by mapping 0 to K subcarriers and performing an IFFT, and one 0.8us length signal can be used.
  • information bit 0 a time domain signal can be obtained by mapping 0 to K subcarriers and performing IFFT, and one of these signals can be used for 0.4us length.
  • FIG. 17 shows a WUR PPDU format according to an embodiment of the present invention.
  • one BPSK symbol is added after the legacy preamble of the WUR PPDU to prevent the existing PCR STAs from false detection of the WUR PPDU as its own PPDU, and the WUR part is dummy, It starts after the symbol.
  • the WUR preamble may include parts for AGC (auto-gain control) / synchronization and parts for WUR PPDU information / detection.
  • the information on the WUR PPDU may be composed of information necessary for decoding the PPDU, for example, a data rate. Since the WUR PPDU can be transmitted using various data rates, an indication of the data rate is needed so that the WUR receiver knows what data rate is applied to the WUR PPDU.
  • the data rate set information indicating the data rate used in the WUR-PPDU is indicated together with information on the data rate used in the set, thereby reducing the overhead and increasing the signaling reliability. Is proposed.
  • Sets of data rates are defined to reduce the size of the bit information indicating the data rate, and information about the set of data rates and an indication of the data rate selected in the set may be transmitted in the signature sequence.
  • the data rates for the WUR PPDUs may be 62.5 Kbps, 125 kbps, 250 kbps, 500 kbps, and data rate sets may be configured over two of these data rates.
  • the data rate set may be defined, for example, as (62.5, 125), (62.5 250), (125, 250), (250, 500).
  • the signaling transmitted through the WUR info part can be configured as follows.
  • the signaling sent over the WUR info part may consist of bit information for the data rate set and a signature sequence for indicating the data rate applied to the WUR PPDU in the corresponding data rate set.
  • the bit information for the data rate set may be two bits.
  • the lowest data rate supported by the WUR PPDU can be applied to such 2-bit data rate set information. Since the data rate set information has a small number of bits and the most robust data rate is applied, the data rate set information can be transmitted without CRC.
  • a 1-bit parity check bit may be appended to the data rate set information for error checking.
  • the data rate set information may be composed of one bit. Depending on the number of data rate sets, the number of bits required for the data rate set information may be determined, and in consideration of overhead, the data rate set information preferably does not exceed two bits.
  • two signature sequences may be defined to indicate a selected data rate in the set.
  • Signature sequence can be transmitted through OOK symbol basically, but it is desirable that Manchester coding is applied considering reliability.
  • FIG. 18 is a view for explaining a PPDU information part according to an embodiment of the present invention.
  • the data rate can be indicated through the following sequences having the same length of HD and sequence length.
  • information about the data rate and other information about the WUR PPDU may be sent in a hierarchical manner via [SIG field + signature sequence] or [signature sequence + SIG field].
  • PPDU info part is composed of signature sequence + SIG field
  • FIG. 19 shows a case where a PPDU info part is composed of a signature sequence + SIG field according to an embodiment of the present invention.
  • the signature sequence can be constructed in the manner mentioned in Method 1.
  • Signature sequences may be defined taking into account the number of total data rates.
  • Information about the set of data rates may be sent to the STA via PCR to reduce the overhead for data rate indication.
  • the AP may use the signature sequence for indicating the data rate selected in the data rate set that was instructed via PCR.
  • the SIG field located after the signature sequence may be transmitted using the data rate indicated in the signature sequence.
  • the SIG field may not be provided with an error check bit (e.g., CRC).
  • the SIG field may include at least one of the following information.
  • the WUR PPDU Length can be fixed to several types. Therefore, information on the WUR PPDU Length type can be transmitted.
  • the WUR PPDU Length can be indicated in consideration of the data rate applied to the WUR PPDU.
  • FIG. 20 shows a case where a PPDU Info Part is composed of a SIG field + signature sequence according to an embodiment of the present invention.
  • the SIG field can be transmitted using the lowest data rate applicable to the WUR PPDU.
  • the SIG field may not contain a bit for error checking.
  • information such as WUR Frame Format Type, WUR PPDU Length information, and the like can be transmitted through the SIG field.
  • the SIG field may be transmitted applying the lowest data rate among the data rates for the WUR PPDU.
  • the SIG field can be transmitted with the lowest data rate in the data rate set used by the WUR PPDU.
  • a set of data rates may be constructed taking into account the overhead and reliability of the signature sequence and the AP may send information about the set of data rates to the STA via PCR. Since the AP only has to indicate the data rate selected in the data rate set as WUR, the length of the signature sequence for indicating the data rate can be shortened and the overhead can be reduced.
  • data rate set information is provided to the STA (e.g., before entering the WUR mode) via PCR instead of signaling indicating data rate set information via WUR,
  • the data rate applied to the WUR PPDU in the set may be indicated via the WUR preamble.
  • the PPDU information part may be repeatedly transmitted to improve the reliability of the PPDU information part.
  • Figure 21 illustrates the structure of a WUR preamble part for repeated transmission of a PPDU information part in accordance with an embodiment of the present invention.
  • FIG. 22 shows a flow of a WUR PPDU transmission / reception method according to an embodiment of the present invention.
  • the STA receives data rate set information indicating a specific data rate set among a plurality of data rate sets through a primary connectivity radio (PCR) (2205).
  • PCR primary connectivity radio
  • the AP generates a WUR PPDU including the data part and the WUR preamble (2215). Any data rate selected in the specific data rate set indicated by the PCR may be applied to the data part. For example, the AP may encode a data part over a selected data rate.
  • the WUR preamble may indicate the data rate applied to the data part of the plurality of data rates included in the particular data rate set.
  • each of the plurality of data rate sets may comprise two data rates. If the WUR preamble corresponds to the first sequence, a lower data rate of the two data rates included in the particular data rate set may be applied to the data part. If the WUR preamble corresponds to the second sequence, a higher data rate of the two data rates included in the particular data rate set may be applied to the data part.
  • the Hamming distance between the first sequence and the second sequence may be any one of 3, 5, and 7.
  • the plurality of data rate sets includes a first data rate set including 62.5 kbps and 125 kbps, a second data rate set including 62.5 kbps and 250 kbps, a third data rate set including 125 kbps and 250 kbps, and 250 kbps and 500 kbps Lt; / RTI > set of data rates.
  • the WUR preamble may include a synchronization sequence for synchronization with the WUR PPDU.
  • the WUR preamble may further include a signal (SIG) field and a signature sequence.
  • the SIG field may include length information of the WUR PPDU determined in consideration of the data rate applied to the data part, and format information indicating whether the WUR PPDU is a unicast format, a multicast format, or a broadcast format.
  • the signature sequence may indicate the data rate applied to the data part.
  • the STA receives the WUR PPDU including the WUR preamble and the data part via the WUR (2220).
  • the STA may decode the WUR PPDU (2225). As an example, the STA may determine the data rate applied to the data part of the WUR PPDU based on the data rate set information obtained via PCR and the WUR preamble. The STA may decode the data part of the WUR PPDU based on the determined data rate.
  • 23 is a view for explaining an apparatus for implementing the above-described method.
  • the wireless device 100 of FIG. 23 may correspond to the specific STA of the above description, and the wireless device 850 may correspond to the AP described above.
  • STA 100 may include processor 110, memory 120 and transceiver 130 and AP 150 may include processor 160, memory 170 and transceiver 180.
  • the transceivers 130 and 180 transmit / receive wireless signals and may be implemented at a physical layer such as IEEE 802.11 / 3GPP.
  • Processors 110 and 160 are implemented in the physical layer and / or MAC layer and are coupled to transceivers 130 and 180.
  • Processors 110 and 160 and / or transceivers 130 and 180 may include application specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processors.
  • the memories 120 and 170 may comprise read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage unit.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory card
  • storage medium storage medium
  • the method described above may be executed as a module (e.g., process, function) that performs the functions described above.
  • the module may be stored in memory 120,170 and executed by processor 110,160.
  • the memory 120, 170 may be located inside or outside the process 110, 160 and may be coupled to the process 110, 160 by well known means.
  • the transceiver 130 of the STA may include a transmitter (not shown) and a receiver (not shown).
  • the receiver of the STA may include a main connected radio receiver for receiving the main attached radio (e.g., IEEE 802.11a / b / g / n / ac / ax) signal and a WUR receiver for receiving the WUR signal have.
  • the STA's transmitter may include a main connected radio transmitter for transmitting the main connected radio signal.
  • the transceiver 180 of the AP may include a transmitter (not shown) and a receiver (not shown).
  • the transmitter of the AP may correspond to the OFDM transmitter.
  • the AP may reuse the OFDM transmitter to transmit the WUR payload in an OOK manner.
  • the AP may OOK modulate the WUR payload via an OFDM transmitter, as described above.
  • the present invention can be applied to various wireless communication systems including IEEE 802.11.

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Abstract

La présente invention concerne, selon un mode de réalisation, un procédé de réception d'une PPDU WUR par une station (STA) dans un LAN sans fil qui peut comprendre les étapes consistant : à recevoir, par l'intermédiaire d'une PCR, des informations d'ensemble de débit de données indiquant un ensemble de débits de données particulier parmi de multiples ensembles de débits de données; à recevoir, par l'intermédiaire d'une WUR, une PPDU WUR comprenant un préambule de WUR et une partie de données; et à déterminer un débit de données appliqué à la partie de données de la PPDU WUR sur la base des informations d'ensemble de débit de données et du préambule de WUR, chacun des multiples ensembles de débits de données comprenant de multiples débits de données, et le préambule WUR indiquant un débit de données appliqué à la partie de données parmi de multiples débits de données inclus dans l'ensemble de débits de données particulier.
PCT/KR2018/008062 2017-07-27 2018-07-17 Procédé de transmission ou de réception de trame dans un système lan sans fil et appareil associé Ceased WO2019022424A2 (fr)

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