WO2019107931A1 - Procédé de fonctionnement d'un nœud de communication prenant en charge un mode basse puissance dans un réseau local sans fil - Google Patents

Procédé de fonctionnement d'un nœud de communication prenant en charge un mode basse puissance dans un réseau local sans fil Download PDF

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WO2019107931A1
WO2019107931A1 PCT/KR2018/014853 KR2018014853W WO2019107931A1 WO 2019107931 A1 WO2019107931 A1 WO 2019107931A1 KR 2018014853 W KR2018014853 W KR 2018014853W WO 2019107931 A1 WO2019107931 A1 WO 2019107931A1
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WIPO (PCT)
Prior art keywords
wur
mode
frame
station
access point
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PCT/KR2018/014853
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English (en)
Korean (ko)
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황성현
박승근
김용호
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한국전자통신연구원
한국교통대학교산학협력단
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Publication of WO2019107931A1 publication Critical patent/WO2019107931A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0222—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave in packet switched networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0825—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access
    • H04W74/0875—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access with assigned priorities based access
    • 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 wireless local area network (WLAN) technology, and more particularly, to a method for transitioning an operation mode of a communication node in a wireless LAN.
  • WLAN wireless local area network
  • WLAN wireless local area network
  • WLAN wireless local area network
  • WLAN wireless local area network
  • the standard for wireless LAN technology is being developed as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.
  • the wireless LAN technology according to the IEEE 802.11a standard operates based on an orthogonal frequency division multiplexing (OFDM) scheme and can provide a transmission speed of up to 54 Mbps in the 5 GHz band.
  • the wireless LAN technology according to the IEEE 802.11b standard operates based on a direct sequence spread spectrum (DSSS) scheme and can provide a transmission speed of up to 11 Mbps in the 2.4 GHz band.
  • DSSS direct sequence spread spectrum
  • the wireless LAN technology according to the IEEE 802.11g standard operates based on the OFDM scheme or the DSSS scheme, and can provide a transmission speed of up to 54 Mbps in the 2.4 GHz band.
  • the wireless LAN technology operates in the 2.4 GHz band and the 5 GHz band based on the OFDM scheme.
  • MIMO multiple input multiple output
  • a transmission speed of 300 Mbps can be provided.
  • the wireless LAN technology can support a channel bandwidth of up to 40 MHz, which in this case can provide a transmission speed of up to 600 Mbps.
  • VHT Very high throughput
  • Wireless LAN technology is a proposed technology to support data rates of over 1Gbps.
  • the wireless LAN technology according to the IEEE 802.11ac standard is a technology for providing ultra high throughput in a band below 6 GHz
  • the wireless LAN technology according to the IEEE 802.11ad standard is a technology for providing an ultra high throughput in the 60 GHz band.
  • the wireless LAN technology according to the IEEE 802.11ax standard aims at improving the frequency efficiency in a dense environment.
  • the communication node may include a receiver for low power operation, a transceiver for basic operation according to IEEE 802.11, and the like. For example, in a reception waiting period of a downlink signal, a receiver for a low power operation may operate in a wake-up state, a transceiver for a basic operation in accordance with IEEE 802.11 may operate in a sleep state can do.
  • a communication protocol between a receiver for low-power operation and a transceiver for basic operation according to IEEE 802.11, a receiver for low-power operation and another communication node for example, a transceiver for basic operation according to IEEE 802.11 included in another communication node
  • the communication protocol between the transceiver for the basic operation according to IEEE 802.11 and the communication protocol between the other communication node is not clearly defined, Communication performance may be degraded due to transmission / reception failure of the frame in the LAN.
  • a communication node supporting low-power operation may operate in a normal mode or a wake-up radio (WUR) mode.
  • the transceiver of the communication node operating in the WUR mode may operate in a sleep state and the access point may transmit a WUR wakeup frame to the communication node to wake up the transceiver operating in the sleep state. If the data to be transmitted to the communication node frequently occurs, the number of transmissions of the WUR wakeup frame also increases, so that the channel overhead may increase. As a result, channel efficiency may be degraded.
  • a method of operating a station including PCR and WURx includes: operating the WUR mode among a normal mode, a WUR mode, and a WUR delay mode; Receiving, from an access point, a WUR mode deferred request frame indicating a transition from the WUR mode to the WUR deferred mode; and determining, based on the WUR mode deferred request frame, that the operation mode of the station is the WUR deferred mode Mode. ≪ / RTI >
  • the WURx may operate in a sleep state, and the WURx may operate in a wakeup state in a predetermined duration.
  • WUR parameters set in the negotiation procedure of the WUR mode may be maintained at the station and the access point, and the WUR parameters may be on duration and duty cycle intervals .
  • the PCR may operate in a frequency band of 20 MHz
  • the WURx may operate in a frequency band less than 20 MHz
  • the WUR mode defer request frame may be received through the WURx.
  • the operation method of the station may further include transmitting, to the access point, an ACK frame for instructing approval of a transition from the WUR mode to the WUR delay mode before a transition to the WUR delay mode .
  • the method of operation of the station may further include receiving a data frame from the access point without receiving a WUR wakeup frame when the station operates in the WUR suspended mode.
  • the WUR mode deferment request frame may include a legacy preamble and a WUR payload, and an indicator indicating a transition from the WUR mode to the WUR deferred mode may be included in the WUR payload of the WUR mode defer request frame .
  • the WUR mode deferred request frame may include a timer indicating a time at which the station operates in the WUR deferred mode.
  • the operation method of the station may further include, when the time indicated by the timer included in the WUR mode suspension request frame expires, transitioning the operation mode of the station from the WUR suspension mode to the WUR mode .
  • the WUR mode deferment request frame may further include an indicator for indicating a transition method of the operation mode of the station after expiration of the timer, the indicator indicating a transition of the operation mode through a signaling procedure with the access point Or to indicate a transition of the operating mode without signaling procedures with the access point.
  • a method of operating a station including a PCR and a WURx according to a second embodiment of the present invention.
  • the station includes a normal mode, a WUR mode, and a WUR mode, Receiving a WUR mode tier down frame from the access point over the WURx indicating a transition from the WUR mode or the WUR grace mode to the normal mode, and based on the WUR mode tear down frame, And transitioning the operation mode of the station from the WUR mode or the WUR suspended mode to the normal mode.
  • the WUR mode tier down frame may include a timer indicating a time when the station operates in the normal mode.
  • the operation mode of the station is changed from the normal mode to the WUR mode or the WUR delay mode,
  • the method comprising the steps of:
  • the WUR parameters set in the negotiation procedure of the WUR mode may be released at the station and the access point, And may be a duration and duty cycle section.
  • the WURx may operate in a sleep state, and the WURx may operate in a wakeup state in a predetermined duration.
  • a method of operating a station including PCR and WURx includes: operating the WUR mode among a normal mode, a WUR mode, Receiving a WUR wakeup frame from the access point via the WURx, the WUR wakeup frame including an indicator indicating a transition from the WUR mode to the WUR deferred mode; when the WUR wakeup frame is received, Up state, and transitioning the operation mode of the station from the WUR mode to the WUR deferred mode based on the WUR wakeup frame.
  • the operation method of the station may further include the step of the station operating in the WUR suspended mode transmitting a WUR-poll frame to the access point in response to the WUR wakeup frame.
  • the operation method of the station may include a step in which the station operating in the WUR mode transmits a WUR-poll frame to the access point in response to the WUR wakeup frame before a transition to the WUR suspended mode .
  • the WUR wakeup frame may include a timer indicating a time at which the station operates in the WUR delay mode.
  • the operation method of the station further includes a step of transitioning the operation mode of the station from the WUR suspended mode to the WUR mode when the time indicated by the timer included in the WUR wakeup frame has expired can do.
  • the low-power station can operate in a normal mode, a wake-up radio (WUR) mode, or a suspend (WUR) mode, and the low-power station operates in a WUR mode To the WUR suspended mode.
  • WUR wake-up radio
  • WUR suspend
  • a low power station operating in WUR grace mode can receive data frames from an access point without receiving a WUR wakeup frame, thereby reducing channel overhead due to transmission and reception of WUR wakeup frames.
  • the operation mode of the communication node may be shifted from the WUR mode or the WUR suspended mode to the normal mode through the one-way signaling procedure, and the communication node may operate based on the information contained in the frame triggering the transition operation.
  • the access point can transmit a frame requesting to stop transmission of the frame.
  • a frame requesting to stop transmission of a frame is received from an access point, a plurality of stations can stop transmission of the frame. Therefore, the transmission collision problem can be solved.
  • the access point can stop the single uplink transmission procedure and perform the multiple uplink transmission The procedure can be triggered. Therefore, the efficiency of resource use in the wireless LAN can be improved.
  • FIG. 1 is a conceptual diagram showing a first embodiment of a wireless LAN-based communication system.
  • FIG. 2 is a block diagram showing a first embodiment of a communication node belonging to a WLAN-based communication system.
  • FIG. 3 is a timing diagram showing a first embodiment of a method of operating a communication node based on EDCA.
  • FIG. 4 is a conceptual diagram showing a second embodiment of a wireless LAN-based communication system.
  • FIG. 5 is a block diagram illustrating a first embodiment of a low power station in a WLAN-based communication system.
  • FIG. 6 is a block diagram illustrating a second embodiment of a low power station in a WLAN-based communication system.
  • FIG. 7 is a conceptual diagram showing a first embodiment of a channel configuration in a wireless LAN-based communication system.
  • FIG. 8 is a timing diagram showing a first embodiment of a method of operating a communication node in a wireless LAN-based communication system.
  • FIG. 9 is a block diagram showing a first embodiment of a WUR wakeup frame in a WLAN-based communication system.
  • FIG. 10 is a timing chart showing a second embodiment of a method of operating a communication node in a wireless LAN-based communication system.
  • FIG. 11 is a conceptual diagram showing a first embodiment of a transition method of an operation mode in a wireless LAN-based communication system.
  • FIG. 12 is a block diagram showing a first embodiment of a frame used for a transition procedure of an operation mode in a WLAN-based communication system.
  • FIG. 13 is a timing chart showing a first embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • FIG. 14 is a timing chart showing a second embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • 15 is a timing chart showing a third embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • 16 is a timing chart showing a first embodiment of a transition method to a normal mode in a wireless LAN-based communication system.
  • 17 is a timing chart showing a fourth embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • FIG. 18 is a timing chart showing a fifth embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • FIG. 19 is a timing chart showing a first embodiment of a method for resetting WUR parameters in a wireless LAN-based communication system.
  • 20 is a timing diagram showing a first embodiment of transmission collision in a WLAN-based communication system.
  • 21 is a timing chart showing a first embodiment of a collision indicating method in a wireless LAN based communication system.
  • FIG. 22 is a timing chart showing a first embodiment of a multiple uplink transmission method in a wireless LAN-based communication system.
  • FIG. 23 is a block diagram showing a first embodiment of a channel information element in a WLAN-based communication system.
  • first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
  • / or < / RTI &gt includes any combination of a plurality of related listed items or any of a plurality of related listed items.
  • the embodiments described in the specification may be applied to a communication system (e.g., a wireless local area network (WLAN) based communication system) according to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.
  • a communication system e.g., a wireless local area network (WLAN) based communication system
  • IEEE Institute of Electrical and Electronics Engineers 802.11 standard
  • the embodiments described in the specification may be applied to other communication systems as well as communication systems conforming to the IEEE 802.11 standard.
  • the embodiments described in the specification may be applied to wireless personal area network (WPAN) based communication systems, wireless body area network (WBAN) based communication systems, 4G communication systems (e.g., long term evloution (Advanced System) communication system, LTE-A (Advanced) based communication system), 5G communication system (e.g., NR (new radio) communication system).
  • WPAN wireless personal area network
  • WBAN wireless body area network
  • 4G communication systems e.
  • An STA can be classified into an access point (AP) STA and a non-AP STA.
  • An AP STA may simply be referred to as an access point, and a non-AP STA may simply be referred to as a station.
  • the access point may be a base station (BS), a node B, an evolved node B, a relay, a radio remote head (RRH), a transmission and reception point (TRP) .
  • BS base station
  • RRH radio remote head
  • TRP transmission and reception point
  • a station may be referred to as a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a device, etc. and may be a smart phone, a tablet PC, a laptop computer, a sensor device, and the like.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • device etc. and may be a smart phone, a tablet PC, a laptop computer, a sensor device, and the like.
  • FIG. 1 is a conceptual diagram showing a first embodiment of a wireless LAN-based communication system.
  • a WLAN-based communication system may include at least one basic service set (BSS).
  • the BSS may indicate a set of communication nodes (e.g., AP # 1-2, STA # 1-6, etc.).
  • the BSS can be classified into an infrastructure BSS (infrastructure BSS) and an independent BSS (IBSS).
  • BSS # 1-2 may be an infrastructure BSS
  • BSS # 3 may be an IBSS.
  • BSS # 1 may include station # 1, access point # 1 connected to a distribution system, and the like.
  • BSS # 1 may further include a distribution system.
  • the communication between the station # 1 and the access point # 1 can be performed based on the IEEE 802.11 standard in the BSS # 1.
  • BSS # 2 may include station # 2, station # 3, access point # 2 connected to the distribution system, and the like.
  • BSS # 2 may further include a distribution system. Communication between the station # 2 and the access point # 2, communication between the station # 3 and the access point # 2, etc. can be performed based on the IEEE 802.11 standard in the BSS # 2.
  • Communication between stations (e.g., STA # 1-3) in BSS # 1 or BSS # 2 may be performed through an access point (e.g., AP # 1-2). However, when a direct link is established between stations (e.g., STA # 1-3), direct communication between stations (e.g., STA # 1-3) can be performed.
  • BSS # 3 may be an IBSS operating in an ad-hoc mode. There may not be an access point which is an entity that performs a management function in the BSS # 3.
  • stations (STA # 4-6) can be managed based on a distributed manner. Stations (STA # 4-6) can configure a self-contained network since connections from BSS # 3 to the distribution system are not allowed.
  • a plurality of BSSs may be interconnected via a distribution system.
  • a plurality of BSSs connected through a distribution system may be referred to as an extended service set (ESS).
  • the communication nodes e.g., AP # 1-2 and STA # 1-3
  • the communication nodes included in the ESS can communicate with each other, and stations (e.g., STA # 1-3) While moving between BSSs (e.g., BSS # 1-2).
  • a communication node belonging to a wireless LAN-based communication system can be configured as follows.
  • FIG. 2 is a block diagram showing a first embodiment of a communication node belonging to a WLAN-based communication system.
  • the communication node 200 includes a baseband processor 210, a transceiver 220, an antenna 230, a memory 240, an input interface unit 250, an output interface unit 260, And the like.
  • the baseband processor 210 may perform baseband-related signal processing, and may include a MAC processor 211 and a PHY processor 212.
  • the MAC processor 211 may perform the functions of the MAC layer defined by the IEEE 802.11 standard and the PHY processor 212 may perform the functions of the PHY layer defined by the IEEE 802.11 standard.
  • the transceiver 220 may include a transmitter 221 and a receiver 222.
  • the antenna 230 may be configured as an antenna array to support multiple-input multiple-output (MIMO).
  • the memory 240 may store instructions executed by the baseband processor 210 and may be configured with at least one of a read only memory (ROM) and a random access memory (RAM).
  • the input interface unit 250 may obtain information from a user of the communication node 200 and the output interface unit 260 may provide information to a user of the communication node 200.
  • the baseband processor 210, the RF transceiver 220, the memory 240, the input interface unit 250 and the output interface unit 260 may be connected to each other via a bus.
  • a communication node for example, an access point, a station, etc. belonging to a WLAN-based communication system can use a point coordination function (PCF), a hybrid coordination function (HCF), a HCF controlled channel access (HCCA) function, EDCA (enhanced distributed channel access), or the like.
  • PCF point coordination function
  • HCF hybrid coordination function
  • HCCA HCF controlled channel access
  • EDCA enhanced distributed channel access
  • a frame can be classified into a management frame, a control frame, and a data frame.
  • the management frame includes a connection request frame, a connection response frame, a reassociation request frame, a reconnection response frame, a probe request frame, a probe response frame, a beacon frame, A disassociation frame, an authentication frame, a deauthentication frame, an action frame, and the like.
  • the control frame includes an ACK (acknowledgment) frame, a BAR (block ACK request) frame, a BA (block ACK) frame, a power saving -Pol frame, a request to send (RTS) .
  • a data frame may be classified as a quality of service (QoS) data frame and a non-QoS (non-QoS) data frame.
  • QoS data frame may indicate a data frame requiring transmission according to the QoS
  • a non-QoS data frame may indicate a data frame not requiring transmission according to the QoS.
  • FIG. 3 is a timing diagram showing a first embodiment of a method of operating a communication node based on EDCA.
  • a communication node that wishes to transmit a control frame may monitor the channel status during a preset interval (for example, SIFS (short interframe space), PIFS (PCF IFS) (E.g., a carrier sensing operation), and when a channel state is determined to be an idle state during a predetermined interval (e.g., SIFS, PIFS), a control frame Or a management frame).
  • a preset interval for example, SIFS (short interframe space), PIFS (PCF IFS) (E.g., a carrier sensing operation), and when a channel state is determined to be an idle state during a predetermined interval (e.g., SIFS, PIFS), a control frame Or a management frame).
  • the communication node may transmit an ACK frame, a BA frame, a CTS frame, or the like when the channel state is determined to be the idle state during SIFS.
  • the communication node may transmit a beacon frame or the like when the channel state is determined to be the idle state during
  • the communication node may not transmit the control frame (or management frame).
  • the carrier sensing operation may indicate a clear channel assessment (CCA) operation.
  • a communication node that wishes to transmit a non-QoS data frame may perform a channel status monitoring operation (e.g., a carrier sensing operation) during a DIFS (DCF IFS), and if the channel status is determined to be idle during DIFS
  • a random backoff procedure can be performed.
  • the communication node may select a backoff value (e.g., a backoff counter) within a contention window according to a random backoff procedure and may select a period corresponding to the selected backoff value Quot; off period ”) of the channel state.
  • the communication node may transmit a non-QoS data frame when the channel status is determined to be idle in the backoff interval.
  • a communication node that wishes to transmit a QoS data frame may perform a channel status monitoring operation (for example, a carrier sensing operation) during an arbitration IFS (AIFS), and when a channel status is determined to be idle during AIFS, Off procedure.
  • AIFS may be set according to the AC (access category) of a data unit (e.g., protocol data unit (PDU)) included in the QoS data frame.
  • the AC of the data unit may be as shown in Table 1 below.
  • AC_BK may indicate background data
  • AC_BE may indicate data transmitted in best effort manner
  • AC_VI may indicate video data
  • AC_VO may indicate voice voice data.
  • the length of the AIFS for the QoS data frame corresponding to each of AC_VO and AC_VI may be set equal to the length of DIFS.
  • the length of the AIFS for the QoS data frame corresponding to each of AC_BE and AC_BK may be set longer than the length of the DIFS.
  • the length of the AIFS for the QoS data frame corresponding to AC_BK may be set longer than the length of the AIFS for the QoS data frame corresponding to AC_BE.
  • the communication node may select a backoff value (e.g., a backoff counter) within the contention window according to the AC of the QoS data frame.
  • a backoff value e.g., a backoff counter
  • the competition window according to AC may be as shown in Table 2 below.
  • CW min may indicate a minimum value of a contention window
  • CW max may indicate a maximum value of a contention window
  • each of a minimum value and a maximum value of a contention window may be expressed by a number of slots.
  • the communication node may perform a monitoring operation (e.g., a carrier sensing operation) of a channel state in a backoff interval, and may transmit a QoS data frame in a backoff interval when the channel status is determined to be an idle state.
  • a monitoring operation e.g., a carrier sensing operation
  • FIG. 4 is a conceptual diagram showing a second embodiment of a wireless LAN-based communication system.
  • a WLAN-based communication system includes an access point 400, a station supporting low-power operation (hereinafter referred to as a "low-power station") 411, 412, 413, a wake- (Hereinafter referred to as " legacy station ”) 421, 422, 423, and the like.
  • the low power stations 411,412 and 413 and the legacy stations 421,422 and 423 may belong to the coverage of the access point 400 and the access point 400 may belong to the low power stations 411,412 and 413, And legacy stations 421, 422, and 423, respectively.
  • the low power station # 1 411 and the legacy station # 2 422 can be smartphones and are connected to the low power station # 2 412, the low power station # 3 413, the legacy station # 1 421 and the legacy station # 423 may be a sensor device.
  • the access point 400 may support communication protocols used by the low power stations 411, 412, and 413 and the legacy stations 421, 422, and 423, respectively.
  • the low power stations 411, 412, and 413 may use the communication protocols defined in the IEEE 802.11 ba standard.
  • the low power stations 411, 412, and 413 may be configured to communicate not only with the IEEE 802.11 ba standard but also with other communication standards such as IEEE 802.11a / b / g / n / p / ac / ax / ad / Protocol can be used.
  • the legacy stations 421, 422 and 423 can use the communication protocols defined in standards other than IEEE 802.11 ba (for example, IEEE 802.11a / b / g / n / p / ac / ax / have.
  • IEEE 802.11 ba for example, IEEE 802.11a / b / g / n / p / ac / ax / have.
  • the legacy stations 421, 422 and 423 may be configured the same or similar to the communication node 200 shown in Fig. 2, and the low power stations 411, 412 and 413 may be configured as follows.
  • FIG. 5 is a block diagram illustrating a first embodiment of a low power station in a WLAN-based communication system.
  • the low power station 500 includes a baseband processor 510, a primary connectivity radio (PCR) 520, an antenna 530, a memory 540, an input interface unit 550, an output interface unit 560, a WURx (wake-up receiver) 570, and the like.
  • the low power station 500 may further include a WURx 570 as compared to the communication node 200 of FIG.
  • the function of each of the baseband processor 510, the PCR 520, the antenna 530, the memory 540, the input interface unit 550 and the output interface unit 560 included in the low power station 500 is the same as that of FIG.
  • the WURx 570 may be located within the PCR 520, or it may be configured independently of the PCR 520. WURx 570 and PCR 520 may share the same antenna 530. Alternatively, the antenna for WURx 570 may be configured separately from the antenna for PCR 520.
  • low power station 500 may include a first antenna (not shown) for WURx 570 and a second antenna (not shown) for PCR 520.
  • the communication between the WURx 570 and the PCR 520 may be performed using a primitive signal, a signal according to an application protocol interface (API), or the like.
  • API application protocol interface
  • the WURx 570 may operate in a narrow band (e.g., 4 MHz, 8 MHz, 16 MHz, etc.) and the power consumption of the low power station 500 including WURx 570 may be less than 1 mW.
  • WURx 570 may receive an on-off keying (OWK) modulated signal (e.g., a WUR wakeup frame) and perform demodulation on the received signal to obtain information contained in the received signal Can be confirmed.
  • the PCR 520 may send and receive frames (e.g., control frames, management frames, data frames) defined in the IEEE 802.11 standard and may operate in at least one of the 2.4 GHz frequency band and the 5 GHz frequency band .
  • the PCR 520 may support 20 MHz bandwidth, 40 MHz bandwidth, 80 MHz bandwidth, 160 MHz bandwidth, and the like.
  • Each of PCR 520 and WURx 570 may operate in a wake-up state or a sleep state.
  • the wakeup state may indicate a state in which power is supplied to a corresponding entity (e.g., PCR 520, WURx 570), and may be set to an on state, an activation state, Quot ;, " enable state ", " awake state “, and the like.
  • the sleep state is a state in which no electric power is supplied to a corresponding entity (for example, PCR 520 or WURx 570) or a minimum power is supplied to a corresponding entity (for example, PCR 520, WURx 570) And may be referred to as "off state", “deactivation state”, “disable state”, “doze state”, and the like.
  • the low power station 500 may support a normal mode that does not use WURx and a WUR mode that enables the use of WURx. Additionally, the low power station 500 may support a WUR suspend mode. Even when the parameters for the WUR operation are set, the low power station 500 can operate in the WUR delay mode to perform the low power operation of the existing PCR.
  • the low power station 500 may perform the operation of the PCR without the use of WURx and may operate in the same or similar manner as the communication node 200 of FIG.
  • the WURx 570 of the low power station 500 can operate in the sleep state.
  • the PCR 520 operating in a wakeup state may perform transmission and reception procedures of a frame (e.g., a legacy frame, a legacy signal) with another communication node.
  • the WURx 570 of the low-power station 500 can operate in the wake-up state.
  • the WURx 570 operating in the wakeup state may perform a monitoring operation (e.g., a carrier sensing operation) on the channel to receive the WUR wakeup frame.
  • the WUR wakeup frame may request the PCR 520 of the low power station 500 to operate in a wake up state.
  • the WURx 570 may send a wake up indicator to the PCR 520 requesting it to operate in a wake up state have.
  • the wakeup indicator is received from the WURx 570
  • the operational state of the PCR 520 may transition from the sleep state to the wake up state.
  • the wake-up indicator is transmitted to the PCR 520 or when the operating state of the PCR 520 transitions from the sleep state to the wake-up state
  • the operating state of the WURx 570 may transition from the wakeup state to the sleep state have.
  • the operating state of the WURx 570 may transition from the wakeup state to the sleep state.
  • the time required for the PCR 520 to transition from the sleep state to the wake-up state can be referred to as " state transition time ".
  • the state transition time may indicate from the reception of the WUR wakeup frame to the time when the PCR 520 of the low power station operates in the wake up state.
  • the operation state of the PCR 520 may transition from the wakeup state to the sleep state.
  • PCR 520 may send a wakeup indicator to WURx 570 requesting it to operate in a wake up state.
  • the wakeup indicator is received from the PCR 520
  • the operating state of the WURx 570 may transition from the sleep state to the wake up state.
  • the wake up indicator is transmitted to the WURx 570 or when the operating state of the WURx 570 transitions from the sleep state to the wake up state
  • the operational state of the PCR 520 may transition from the wake up state to the sleep state have.
  • the low power station 500 may operate in the same or similar manner as the normal mode without performing WUR operation. At this time, the low power station 500 may store the negotiated WUR parameters in the memory 540 without deleting the WUR parameters for the WUR operation.
  • baseband processor 510 may operate in a wakeup state or a sleep state based on the operational state of PCR 520 .
  • the baseband processor 510 e.g., the MAC processor 511
  • the baseband processor 510 may also operate in a wakeup state when the PCR 520 is operating in a wakeup state
  • the baseband processor 510 e.g., the MAC processor 511) may also operate in a sleep state.
  • the baseband processor 510 e.g., MAC processor 511
  • the operating state may transition from the sleep state to the wake up state.
  • the operating state of the baseband processor 510 e.g., the MAC processor 511
  • the baseband processor 510 can always operate in a wakeup state regardless of the operating state of the PCR 520.
  • an access point supporting low power operation may be configured the same or similar to the low power station 500 described above.
  • the access point may include a baseband processor 510, a PCR 520, an antenna 530, a memory 540, an input interface unit 550, an output interface unit 560, a WURx 570, can do.
  • the access point may include a wake-up transmitter (WUTx) (not shown) instead of WURx 570, or may include a WUR (wake-up radio) that performs WURx 570 and the functions of WUTx have.
  • WUTx may perform operations corresponding to WURx (570).
  • WUTx may operate in a narrow band (e.g., 4 MHz, 8 MHz, 16 MHz, etc.). WUTx may transmit an OOK modulated signal (e.g., a WUR wakeup frame).
  • the low power station 500 may further include a WUTx corresponding to the WURx 570.
  • FIG. 6 is a block diagram illustrating a second embodiment of a low power station in a WLAN-based communication system.
  • the low power station 600 includes a baseband processor 610, a transceiver # 1 620-1, a transceiver # 2 620-2, an antenna # 1 630-1, an antenna # 2 630-2, a memory 640, an input interface unit 650, an output interface unit 660, and the like.
  • the low power station 600 may further include transceiver # 2 620-2 and antenna # 2 630-2 as compared to the communication node 200 of FIG.
  • Each of transceiver # 1 620-1 and transceiver # 2 620-2 may be referred to as PCR # 1 and PCR # 2.
  • An access point supporting low power operation may be configured the same or similar to the low power station 600 described above.
  • the access point may include a baseband processor 610, transceiver # 1 620-1, transceiver # 2 620-2, antenna # 1 630-1, antenna # 2 630-2, A memory 640, an input interface unit 650, an output interface unit 660, and the like.
  • the frequency band supported by the PCR of the communication node is the IEEE 802.11 standard (for example, IEEE 802.11a / b / g / 20 MHz, 40 MHz, 80 MHz, 160 MHz or the like, depending on the type of the signal.
  • one channel (channel) CH in the frequency band supported by the PCR may include a plurality of subchannels (SUB-CH).
  • the number of subchannels and the bandwidth may differ depending on the IEEE 802.11 standard (for example, IEEE 802.11a / b / g / n / p / ac / ad / ax / ay).
  • IEEE 802.11a / b / g / n / p / ac / ad / ax / ay For example, in a WLAN-based communication system supporting the IEEE 802.11ax standard, a channel having a bandwidth of 20 MHz may include up to nine sub-channels according to the size of an RU (resource unit) allocated to a sub-channel.
  • a channel can be set as follows.
  • FIG. 7 is a conceptual diagram showing a first embodiment of a channel configuration in a wireless LAN-based communication system.
  • the WURx of a communication node may support 20 MHz or a frequency band less than 20 MHz (e.g., 4 MHz, 8 MHz, 16 MHz, etc.).
  • the channel used by WURx may comprise a plurality of subchannels, and the bandwidth of each of the plurality of subchannels may be less than the bandwidth supported by the PCR.
  • the 40 MHz frequency band may consist of channel # 0 and channel # 1, and if the bandwidth of the subchannel is 4 MHz, each of channel # 0 and channel # 1 may contain three or four subchannels have.
  • a guard band (GB) for protecting each subchannel may be located between the subchannels.
  • the corresponding second communication node is a method corresponding to the method performed at the first communication node For example, reception or transmission of a frame). That is, when the operation of the station is described, the corresponding access point can perform an operation corresponding to the operation of the station. Conversely, when the operation of the access point is described, the corresponding station can perform an operation corresponding to the operation of the access point.
  • the transmission start time and the transmission end time of the signal (e.g., frame) in the transmitting communication node may be the same as the receiving start time and receiving end time of the corresponding signal (e.g., corresponding frame) have.
  • the start point of a signal e.g., a frame
  • an end point of a signal e.g., a frame
  • FIG. 8 is a timing diagram showing a first embodiment of a method of operating a communication node in a wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the access point may send a WUR wake up frame 801 to wake up the low power station.
  • the access point can generate a WUR wakeup frame 801 and send a WUR wakeup frame 801 to the low power station when the state of the channel in the carrier sensing period is determined to be idle.
  • the carrier sensing period is the same as SIFS, PIFS, DIFS, AIFS, DIFS + backoff interval, AIFS [AC_VO] + backoff [AC_VO] Back off [AC_VI] section, " AIFS [AC_BE] + backoff [AC_BE] section, or " AIFS [AC_BK] + backoff [AC_BK] section ".
  • the WUR wakeup frame 801 may be set as follows.
  • FIG. 9 is a block diagram showing a first embodiment of a WUR wakeup frame in a WLAN-based communication system.
  • a WUR wakeup frame 900 may include a legacy preamble and a WUR payload 950.
  • the legacy preamble may include a legacy short training field (L-STF) 910, a legacy long training field (L-LTF) 920, and an L-SIG (legacy signal)
  • L-STF legacy short training field
  • L-LTF legacy long training field
  • L-SIG legacy signal
  • the size of the frequency band to which the legacy preamble is mapped may be 20 MHz.
  • the legacy preamble may further include a binary phase shift keying (BPSK) -mark 940.
  • the BPSK-mark 940 may be composed of one symbol (for example, an orthogonal frequency division multiplexing (OFDM) symbol) modulated in a BPSK scheme.
  • OFDM orthogonal frequency division multiplexing
  • the BPSK-mark 940 indicates that a legacy station (for example, a station supporting IEEE 802.11n) misidentifies the WUR wakeup frame 900 as another IEEE 802.11 frame, (E. G., Carrier sensing operation, ED (Energy Detection) operation) of the channel state with respect to the signal.
  • ED Electronicgy Detection
  • the WUR payload 950 is narrowed and the received power detected by the ED operation is low, The frame can be transmitted.
  • a BPSK-mark 940 may be used.
  • the WUR payload 950 may be modulated based on the OOK scheme.
  • the size of the frequency band to which the WUR payload 950 is mapped may be smaller than 20 MHz.
  • the WUR payload 950 may further include a WUR sync field 951 and a WUR data field 952.
  • the WUR synchronization field 951 may comprise a pseudo random (PN) sequence used for synchronization between an access point and a low power station (e.g., WURx included in a low power station).
  • PN sequence can indicate the data rate and the bandwidth.
  • the WUR data field 952 includes a frame control field 952-1, an address field 952-2, a TD control field 952-3, a frame body 952-4, and a frame check sequence ) Field 952-5.
  • the address field 952-2 may indicate an identifier (e.g., an association identifier) of the low power station to receive the WUR wakeup frame 900 or a group identifier of the low power stations.
  • Each of the TD control field 952-3 and the frame body 952-4 may include information elements necessary for low power operation (e.g., operation in accordance with the WUR mode).
  • the WUR wakeup frame 801 may be the same as or similar to the WUR wakeup frame 900 of Fig.
  • the access point may send a WUR wakeup frame 801.
  • the WURx of the low power station may receive a WUR wakeup frame 801 and the WUR wakeup frame 801 may be used by the WUR wakeup frame 801 if the wake up object (i.e., the communication node indicated by the address field) PCR can be woken up. That is, when the WUR wakeup frame 801 is received, the operation state of the PCR of the low power station may transition from the sleep state to the wake up state.
  • the wake up object i.e., the communication node indicated by the address field
  • the PCR of the low-power station operating in the wakeup state may send a WUR-poll frame 802 to the access point.
  • the WUR-poll frame 802 may be transmitted when the channel state is idle in the carrier sensing period.
  • the WUR-poll frame 802 may indicate that the operating state of the PCR of the low-power station has transitioned from the sleep state to the wake-up state.
  • the WUR-poll frame 802 may be a power saving-poll frame, an unscheduled-automatic power saver delivery (U-APSD) frame, or any frame (e.g., a null frame) .
  • U-APSD unscheduled-automatic power saver delivery
  • the access point can determine that the operating state of the PCR of the low-power station has transitioned from the sleep state to the wake-up state.
  • the access point may send an ACK frame (not shown) to the low power terminal in response to the WUR-poll frame 802. [
  • the ACK frame may be transmitted after SIFS from the end of the WUR-poll frame 802. [
  • the transmission of the ACK frame, which is a response to the WUR-poll frame 802 may be omitted.
  • the access point may send the data frame 803 to the low power station.
  • the data frame 803 may be transmitted when the channel state is idle in the carrier sensing period.
  • the low power station may receive a data frame 803 from the access point and may transmit an ACK frame 804 to the access point that is a response to the data frame 803 if the data frame 803 was successfully received .
  • the ACK frame 804 may be transmitted after SIFS from the end of the data frame 803.
  • the access point may determine that the data frame 803 has been successfully received at the low power station when an ACK frame 804 is received.
  • the negotiation procedure of the WUR mode between the access point and the low power station can be performed first, and the WUR parameters (for example, on duration) , A duty cycle period) may be set.
  • the negotiation procedure of the WUR mode can be performed as follows.
  • FIG. 10 is a timing chart showing a second embodiment of a method of operating a communication node in a wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the negotiation procedure of the WUR mode may be performed based on a two way signaling scheme.
  • a low power station that wishes to operate in the WUR mode may generate a WUR request frame 1001 and may transmit a WUR request frame 1001 to the access point if the channel state is idle in the carrier sensing period .
  • the WUR request frame 1001 may be an action frame and may include information elements (e.g., WUR parameters) necessary for negotiation of the WUR mode between the access point and the low power station.
  • the WUR parameter may include the on-duration and duty-cycle intervals preferred by the low-power station.
  • the on-duration may indicate the time at which the WURx of the low-power station operates in the wake-up state, and the duty cycle interval may indicate an offset between the starting times of consecutive on durations.
  • the access point may send an ACK frame 1002 to the low power station in response to the WUR request frame 1001.
  • the ACK frame 1002 may be transmitted after SIFS from the end of the WUR request frame 1001. Alternatively, transmission of the ACK frame 1002 may be omitted.
  • the access point can identify the information elements contained in the WUR request frame 1001 and send the WUR response frame 1003 to the low power station if the WUR operation is allowed.
  • the WUR response frame 1003 may be an action frame and may include information elements (e.g., WUR parameters) necessary for negotiation of the WUR mode between the access point and the low power station.
  • the WUR parameters may include on duration and duty cycle intervals determined by the access point.
  • the low power station may send an ACK frame 1004 to the access point in response to the WUR response frame 1003.
  • ACK frame 1004 may be transmitted after SIFS from the end of WUR response frame 1003. Alternatively, transmission of the ACK frame 1004 may be omitted.
  • the low power station may operate based on the WUR parameters included in the WUR request frame 1001 or the WUR response frame 1003. [
  • the low power station can operate in a normal mode (for example, no WUR mode), a WUR mode, or a WUR suspend mode (for example, a WUR mode delay) .
  • Transition methods of the operating mode may be as follows.
  • FIG. 11 is a conceptual diagram showing a first embodiment of a transition method of an operation mode in a wireless LAN-based communication system.
  • the access point may support the normal mode, the WUR mode, and the WUR delay mode, and the low power station may operate in the normal mode, the WUR mode, or the WUR delay mode.
  • the WURx of the low power station may not be used and the PCR of the low power station may perform the existing low power operation defined in IEEE 802.11.
  • the normal mode can be supported in the low power station without the WUR mode negotiation procedure.
  • WUR mode the WURx of the low power station may operate in a wake up state or a sleep state depending on the WUR parameters (e.g., on-duration, duty cycle duration).
  • the PCR of the low power station can basically operate in a sleep state and can operate in a wake up state at the request of the access point.
  • the WURx of the low power station may not be used as needed. This can be defined as " WUR grace mode ". In the WUR grace mode, the WURx of the low power station may not be used. That is, in the WUR suspended mode, the WURx of the low power station can operate in the sleep state and the PCR of the low power station can operate in the normal mode.
  • the transition procedure from the normal mode to the WUR mode can be performed based on the two-way signaling scheme.
  • the transition procedure from the normal mode to the WUR mode may be performed as in the embodiment shown in FIG.
  • the transition procedure from the normal mode to the WUR suspended mode can be performed based on the two-way signaling scheme.
  • the transition procedure from the normal mode to the WUR suspended mode may be performed in the same or similar manner as the embodiment shown in FIG.
  • the transition procedure from the WUR mode to the normal mode may be performed based on a one-way signaling scheme (e.g., a one-way teardown scheme).
  • a WUR mode tear-down frame may be used to release a negotiated WUR mode (e.g., parameters for WUR mode) between the access point and the low power station.
  • the transition procedure from the WUR mode to the WUR delay mode can be performed based on the one-way signaling scheme (e.g., one-way enter scheme).
  • a WUR mode deferred request frame may be used that indicates a deferral of WURx usage.
  • the transition procedure from WUR grace mode to WUR mode may be performed based on a one-way signaling scheme (e.g., one-way enter scheme).
  • a WUR mode request frame indicating the resumption of WURx usage may be used.
  • the transition procedure from the WUR suspended mode to the normal mode may be performed based on a one-way signaling scheme (e.g., a one-way tier-down scheme).
  • a WUR mode tear-down frame may be used to release the negotiated WUR mode (e.g., parameters for WUR mode) between the access point and the low power station.
  • a WUR request frame, a WUR response frame, a WUR mode request frame, a WUR mode response frame, a WUR mode deferred request frame, a WUR mode deferred response frame, a WUR mode tier down frame Can be set as follows.
  • FIG. 12 is a block diagram showing a first embodiment of a frame used for a transition procedure of an operation mode in a WLAN-based communication system.
  • the frame 1200 may be an action frame used for a transition procedure of an operation mode.
  • the frame 1200 includes a frame control field 1210, a duration field 1220, an address 1 field 1230, an address 2 field 1240, an address 3 field 1250, a sequence control field 1260, 1270, a frame body 1280, and an FCS field 1290.
  • Frame body 1280 may include a category field 1281, a WUR action field 1282, a dialog token field 1283, and a WUR mode element field 1284.
  • the category field 1281 may indicate that the frame 1200 is an action frame used for a transition procedure of the operation mode.
  • the WUR action field 1282 may indicate a transition direction of the operation mode (for example, whether it is "WUR mode or WUR grace mode ⁇ normal mode").
  • Diagram token field 1283 may be used to match the timing between the access point and the low power station.
  • the WUR mode element field 1284 may contain the information elements necessary for the transition procedure of the operation mode.
  • the WUR mode element field 1284 includes an element ID field 1284-1, a length field 1284-2, an element ID extension field 1284-3, an action type field 1284-4, a WUR mode response A status field 1284-5, a WUR parameter control field 1284-6, and a WUR parameter field 1284-7.
  • the action type field 1284-4 includes a detailed transition direction of the operation mode (for example, "normal mode ⁇ WUR mode or WUR grace mode", "WUR mode ⁇ WUR grace mode”, "WUR grace mode ⁇ WUR mode”
  • the frame 1200 is a request frame or a response frame.
  • the WUR mode response status field 1284-5 can indicate whether the operation according to the request frame is approved or not.
  • the operation mode of the low power station can be shifted from the WUR mode to the WUR delay mode.
  • the transition procedure from the WUR mode to the WUR delay mode can be performed as follows.
  • FIG. 13 is a timing chart showing a first embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the low power station may operate in the WUR mode, among the normal mode, the WUR mode, and the WUR grace mode, and the access point may generate a WUR mode defer request frame 1301 if necessary (e.g., when the channel is congested) .
  • the WUR mode deferral request frame 1301 may indicate a transition from the WUR mode to the WUR deferred mode and may be the same as or similar to the frame 1200 shown in FIG.
  • the access point can transmit the WUR mode defer request frame 1301 to the low power station when the channel state is idle in the carrier sensing period.
  • a low power station may receive a WUR mode defer request frame 1301 from an access point and may receive a WUR mode defer request frame 1301 from a WUR mode based on the information elements contained in the WUR mode defer request frame 1301. [ It can be confirmed that the transition to the suspended mode is requested.
  • a low power station e.g., PCR
  • ACK frame 1302 may be transmitted after SIFS from the end of the WUR mode defer request frame 1301. [ If the ACK frame 1302 is received from the low power station, the access point may determine that the low power station has accepted the transition request.
  • the access point can transmit the data frame 1303 to the low power station without transmission of the WUR wake up frame according to the existing low power operation defined in IEEE 802.11.
  • a low power station e. G., PCR
  • the low power station e.g., PCR
  • the access point may determine that the data frame 1303 has been successfully received at the low power station.
  • the operating mode of the low power station may transition from WUR mode to WUR deferred mode. If the WUR mode request frame 1305 is received from the low power station, the access point may determine that the transition request is rejected and may send an ACK frame 1306 for the WUR mode request frame 1305 to the low power station . If an ACK frame 1306 is received from the access point in response to the WUR mode request frame 1305, the low power station may again operate in WUR mode.
  • a WUR mode request frame 1305 requesting a transition to the WUR mode may be transmitted to the access point according to a negotiation procedure of the WUR mode.
  • the access point may determine that a transition from the WUR delay mode to the WUR mode is requested and the ACK frame 1306 for the WUR mode request frame 1305, To the low power station. If an ACK frame 1306 is received from the access point in response to the WUR mode request frame 1305, the low power station may again operate in WUR mode.
  • FIG. 14 is a timing chart showing a second embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the low power station may operate in the WUR mode, among the normal mode, the WUR mode, and the WUR grace mode, and the access point may generate the WUR mode grace request frame 1401 if necessary (e.g., when the channel is congested) .
  • the WUR mode deferral request frame 1401 may indicate a transition from the WUR mode to the WUR deferred mode and may be the same as or similar to the frame 1200 shown in Fig.
  • the WUR mode deferral request frame 1401 may include a timer indicating a time when the low power station operates in the WUR deferred mode, and the corresponding timer is a WUR parameter control field 1284 of the frame 1200 shown in FIG. 12 -6) or a WUR parameter field 1284-7.
  • the access point may transmit the WUR mode defer request frame 1401 to the low power station when the channel state is idle in the carrier sensing period.
  • a low power station may receive a WUR mode defer request frame 1401 from an access point and may receive a WUR mode defer request frame 1401 from a WUR mode based on the information elements included in the WUR mode defer request frame 1401. [ It can be confirmed that the transition to the suspended mode is requested. In addition, the low power station may obtain a timer from the WUR mode defer request frame 1401 indicating the time at which the low power station operates in the WUR deferred mode.
  • a low power station may send an ACK frame 1402 to the access point in response to the WUR mode defer request frame 1401, and may operate in a WUR grace mode can do.
  • the low power station may operate in the WUR delay mode from the end of the ACK frame 1402 until the time indicated by the timer included in the WUR mode defer request frame 1401. [ After the low power station sends an ACK frame 1402 for the WUR mode defer request frame 1401, it may not be acceptable for the low power station to send a WUR mode request frame requesting a transition from WUR grace mode to WUR mode have.
  • the ACK frame 1402 may be transmitted after SIFS from the end of the WUR mode defer request frame 1401. [ If the ACK frame 1402 is received from the low power station, the access point may determine that the low power station has accepted the transition request. In this case, because the low power station operates in WUR grace mode, the access point can transmit the data frame 1403 to the low power station without transmission of the WUR wake up frame according to the existing low power operation defined in IEEE 802.11.
  • a low power station e. G., PCR
  • a low power station e.g., PCR
  • a low power station e.g., PCR
  • the access point may determine that the data frame 1403 has been successfully received at the low power station.
  • the low power station may not send the ACK frame 1402 to the access point in response to the WUR mode defer request frame 1401. [ If the ACK frame 1402 is not received within a predetermined time, the access point may determine that the low power station has rejected the transition request.
  • the operation mode of the low power station can be transited from the WUR delay mode to the WUR mode through an explicit signaling procedure.
  • a low power station e.g., PCR
  • the access point may determine that a transition of the operating mode of the low power station (e.g., WUR grace mode ⁇ WUR mode) is requested.
  • the access point may send an ACK frame 1406 to the low power station in response to the WUR mode request frame 1405. [ If an ACK frame 1406 is received from the access point, the low power station may again operate in WUR mode.
  • 15 is a timing chart showing a third embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the low power station may operate in the WUR mode, among the normal mode, the WUR mode, and the WUR grace mode, and the access point may generate a WUR mode grace request frame 1501 if necessary (e.g., when the channel is congested) .
  • the WUR mode deferral request frame 1501 may indicate a transition from the WUR mode to the WUR deferred mode and may be the same as or similar to the frame 1200 shown in Fig.
  • the WUR mode deferral request frame 1501 may include a timer indicating a time when the low power station operates in the WUR deferred mode, and the corresponding timer is a WUR parameter control field 1284 of the frame 1200 shown in FIG. 12 -6) or a WUR parameter field 1284-7.
  • the WUR mode deferral request frame 1501 may further include a mode transition indicator and the mode transition indicator may include a WUR parameter control field 1284-6 or a WUR parameter field 1284 of the frame 1200 shown in FIG. -7).
  • the mode transition indicator may be composed of one bit. For example, a mode transition indicator set to " 0 " may indicate a transition operation of an operation mode of the low power station without an explicit signaling procedure after the time indicated by the timer included in the WUR mode defer request frame 1501 expires Mode? WUR mode).
  • the mode transition indicator set to " 1 " indicates a transition operation of the operation mode of the low power station through the explicit signaling procedure after the time indicated by the timer included in the WUR mode deferred request frame 1501 expires (WUR deferred mode ⁇ WUR Mode).
  • the access point may transmit the WUR mode defer request frame 1501 to the low power station when the channel state is idle in the carrier sensing period.
  • a low power station e.g., WURx or PCR
  • WURx or PCR may receive a WUR mode defer request frame 1501 from an access point and may receive a WUR mode defer request frame 1501 from a WUR mode based on the information elements included in the WUR mode defer request frame 1501. [ It can be confirmed that the transition to the suspended mode is requested.
  • the low power station may obtain a timer and a mode transition indicator from the WUR mode defer request frame 1501 indicating the time at which the low power station operates in the WUR deferred mode.
  • a low power station may send an ACK frame 1502 to the access point in response to the WUR mode defer request frame 1501, and may operate in the WUR deferred mode can do.
  • the low power station may operate in the WUR delay mode from the end of the ACK frame 1502 until the time indicated by the timer included in the WUR mode defer request frame 1501. [ After the low power station sends an ACK frame 1502 for the WUR mode defer request frame 1501, it may not be acceptable for the low power station to send a WUR mode request frame requesting a transition from WUR deferred mode to WUR mode have.
  • ACK frame 1502 may be transmitted after SIFS from the end of the WUR mode defer request frame 1501. [
  • the access point may determine that the low power station has accepted the transition request. In this case, because the low power station operates in WUR grace mode, the access point can transmit the data frame 1503 to the low power station without transmission of the WUR wake up frame according to the existing low power operation defined in IEEE 802.11.
  • a low power station e. G., PCR
  • a low power station e.g., PCR
  • a low power station e.g., PCR
  • the access point may determine that the data frame 1503 has been successfully received at the low power station.
  • the low power station may not send an ACK frame 1502 to the access point in response to the WUR mode defer request frame 1501. [ If the ACK frame 1502 is not received within a predetermined time, the access point may determine that the low power station has rejected the transition request.
  • the low power station can operate according to the mode transition indicator included in the WUR mode defer request frame 1501.
  • the mode transition indicator is set to " 0 "
  • the operating mode of the low power station may transition from WUR grace mode to WUR mode without an explicit signaling procedure.
  • the mode transition indicator is set to " 1 "
  • the transition operation of the operation mode of the low power station can be performed through the signaling procedure of the WUR mode request frame 1405 shown in FIG.
  • transition procedure from the WUR mode or the WUR suspended mode to the normal mode can be performed as follows.
  • 16 is a timing chart showing a first embodiment of a transition method to a normal mode in a wireless LAN-based communication system.
  • the wireless LAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the low power station may operate in the WUR mode or the WUR grace mode and the access point may generate the WUR mode tier down frame 1601 if necessary.
  • the WUR mode tear down frame 1601 may indicate a transition from the WUR mode or the WUR delay mode to the normal mode and may be the same as or similar to the frame 1200 shown in Fig.
  • the WUR mode tear down frame 1601 may include a timer indicating the time when the low power station is operating in the normal mode, and the timer may include a WUR parameter control field 1284- 6) or WUR parameter field 1284-7.
  • the WUR mode tear down frame 1601 may further include a mode transition indicator and the mode transition indicator may be a WUR parameter control field 1284-6 or a WUR parameter field 1284 of the frame 1200 shown in FIG. -7).
  • the mode transition indicator may be composed of one bit. For example, a mode transition indicator set to " 0 " may indicate a transition operation of the operation mode of the low power station without an explicit signaling procedure after the time indicated by the timer included in the WUR mode tier down frame 1601 expires ⁇ WUR mode or WUR grace mode).
  • the mode transition indicator set to " 1 " indicates a transition operation of the operation mode of the low power station through the explicit signaling procedure after the time indicated by the timer included in the WUR mode tier down frame 1601 expires Or WUR grace mode).
  • the access point may transmit the WUR mode tier down frame 1601 to the low power station when the channel state is idle in the carrier sensing period.
  • a low power station e.g., WURx or PCR
  • WURx or PCR may receive a WUR mode tier down frame 1601 from an access point and may receive a WUR mode or WUR mode based on the information elements included in the WUR mode tier down frame 1601 The transition from the suspended mode to the normal mode is requested.
  • the low power station may obtain a timer and a mode transition indicator from the WUR mode tier down frame 1601 indicating the time at which the low power station operates in the normal mode.
  • a low power station may send an ACK frame 1602 to the access point in response to the WUR mode tier down frame 1601, and may operate in the normal mode .
  • the low power station may operate in the normal mode from the end of the ACK frame 1602 to the time point indicated by the timer included in the WUR mode tier down frame 1601.
  • the ACK frame 1602 may be transmitted after SIFS from the end of the WUR mode tier down frame 1601. If the ACK frame 1602 is received from the low power station, the access point may determine that the low power station has accepted the transition request. In this case, because the low power station is operating in the normal mode, the access point can transmit the data frame 1603 to the low power station without transmitting the WUR wake up frame.
  • a low power station e. G., PCR
  • a low power station e.g., PCR
  • a low power station e.g., PCR
  • the access point may determine that the data frame 1603 has been successfully received at the low power station.
  • the low power station may not send the ACK frame 1602 to the access point in response to the WUR mode tier down frame 1601. If the ACK frame 1602 is not received within a predetermined time, the access point may determine that the low power station has rejected the transition request.
  • the low power station can operate according to the mode transition indicator included in the WUR mode suspended request frame 1601.
  • the mode transition indicator is set to " 0 "
  • the operation mode of the low power station can transition from the normal mode to the WUR mode or the WUR suspended mode without an explicit signaling procedure.
  • the mode transition indicator is set to " 1 "
  • the transition operation of the operation mode of the low power station can be performed through the negotiation procedure of the WUR mode shown in FIG.
  • the WUR mode defer request frame may be transmitted after the transmission of the WUR wakeup frame. That is, if the WUR mode deferred request frame is receivable by the PCR of the low power station, the access point may send a WUR mode defer request frame after waking up the PCR of the low power station. In this case, the channel overhead due to the WUR wakeup frame may increase. To solve this problem, a WUR wakeup frame can be used for the WUR mode defer request frame.
  • the transition procedure using the WUR wakeup frame can be performed as follows.
  • 17 is a timing chart showing a fourth embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the WUR wakeup frame 1701 may include an operation indicator indicating a transition from the WUR mode to the WUR suspended mode and a timer indicating the time when the low power station operates in the WUR suspended mode.
  • the WUR wakeup frame 1701 may be the same or similar to the WUR wakeup frame 900 shown in Figure 9 and the operation indicator and timer may be the same as or similar to the TD control field 952-3 of the WUR wakeup frame 900 May be included in the frame body 952-4.
  • the timer indicating the time when the low-power station operates in the WUR suspended mode can be preset in the negotiation procedure of the WUR mode shown in FIG.
  • the WUR wakeup frame 1701 may not include a timer indicating the time when the low power station operates in the WUR suspended mode.
  • the access point may send a WUR wakeup frame 1701 to the low power station when the channel state is idle in the carrier sensing period.
  • the WURx of the low power station can receive the WUR wakeup frame 1701 from the access point and wake up the PCR of the low power station. Further, the low power station can identify an operation indicator indicating a transition from the WUR mode included in the WUR wakeup frame 1701 to the WUR suspended mode, and a timer indicating the time when the low-power station operates in the WUR suspended mode.
  • a timer indicating the time at which the low power station operates in the WUR suspended mode may be preset in the negotiation procedure of the WUR mode, and the low power station may transmit the transition from the WUR mode to the WUR suspended mode via the wakeup frame 1701 You can check the directive you are instructing.
  • the low-power station can operate in the WUR grace mode from the time point of the wake-up of the PCR to the time point indicated by the timer.
  • the operation mode of the low power station is the WUR grace mode To WUR mode.
  • the WUR wakeup frame 1701 may further include a wakeup grace indicator.
  • the wakeup grace indicator may comprise one bit and the wakeup grace indicator set to "0 " may direct the low power station to wake up immediately after receiving the WUR wakeup frame 1701. [ If the wakeup grace indicator is set to " 0 ", the PCR of the low power station can wake up immediately after receiving the WUR wakeup frame 1701.
  • the wakeup grace indicator set to " 1 " may instruct the low power station to wake up at a preset time after receiving the WUR wakeup frame 1701. [ The preset time may be the wakeup time set in the existing low power operation. If the wake-up grace indicator is set to " 1 ", the PCR of the low-power station can wake up at a predetermined time and send a WUR-poll frame 1702 to the access point indicating that the PCR is woken up. If the WUR-poll frame 1702 is received from the low power station, the access point may determine that the PCR of the low power station is operating in a wake up state, and in response to the WUR-poll frame 1702, ) To the low power station. ACK frame 1703 may be transmitted after SIFS from the end of WUR-poll frame 1702. [ When the ACK frame 1703 is received from the access point, the low power station can determine that the WUR-poll frame 1702 has been successfully received at the access point.
  • the access point can determine that the PCR of the low-power station is not woken up. In this case, the access point can retransmit the WUR wakeup frame 1701.
  • the retransmission timer of the WUR wakeup frame 1701 may be extended considering the wake up time set in the existing low power operation.
  • the operations described above can be performed for a plurality of low power stations.
  • the address field of the WUR wakeup frame 1701 may be set to a group address indicating a plurality of low power stations.
  • a plurality of low power stations may operate in WUR grace mode based on the information elements included in the WUR wakeup frame 1701.
  • the wakeup grace indicator included in the WUR wakeup frame 1701 is set to " 1 "
  • the transmission time point of the WUR-poll frame 1702 in a plurality of low power stations may be the same. In this case, the transmission of WUR-poll frames 1702 may collide.
  • the access point may send a trigger frame to a plurality of low power stations indicating the transmission resources of the WUR-poll frame 1702.
  • the transmission resources of the WUR-poll frame 1702 may be different in a plurality of low power stations.
  • each of the plurality of low power stations may transmit a WUR-poll frame 1702 using the resources indicated by the trigger frame. That is, the WUR-poll frame 1702 can be transmitted in an orthogonal frequency division multiple access (OFDMA) scheme.
  • OFDMA orthogonal frequency division multiple access
  • FIG. 18 is a timing chart showing a fifth embodiment of a transition method from the WUR mode to the WUR delay mode in the wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the low power station may operate in the WUR mode among the normal mode, the WUR mode, and the WUR grace mode, and the access point may instruct the transition from the WUR mode to the WUR grace mode if necessary (e.g., when the channel is congested)
  • a WUR wakeup frame 1801 may be generated.
  • the WUR wakeup frame 1801 may include an operation indicator indicating a transition from the WUR mode to the WUR deferred mode, a timer indicating the time when the low power station operates in the WUR deferred mode, and a wakeup grace indicator.
  • the WUR wakeup frame 1801 may be the same or similar to the WUR wakeup frame 900 shown in Figure 9 and the operation indicator, The frame body 952-3 or the frame body 952-4.
  • the timer indicating the time when the low-power station operates in the WUR suspended mode can be preset in the negotiation procedure of the WUR mode shown in FIG.
  • the WUR wakeup frame 1801 may not include a timer indicating the time at which the low power station operates in the WUR suspended mode.
  • the access point may send a WUR wakeup frame 1801 to the low power station if the channel state is idle in the carrier sensing period.
  • the WURx of the low power station may receive the WUR wakeup frame 1801 from the access point and may wake up the PCR of the low power station.
  • the low power station also includes an operation indicator indicating a transition from the WUR mode to the WUR deferred mode included in the WUR wakeup frame 1801, a timer indicating the time when the low power station operates in the WUR deferred mode, .
  • a timer indicating the time at which the low power station operates in the WUR suspended mode may be preset in the negotiation procedure of the WUR mode, and the low power station may transmit the transition from the WUR mode to the WUR suspended mode via the wakeup frame 1801 An indicator for instructing and a wake-up delay indicator can be confirmed.
  • the wakeup grace indicator may comprise one bit and the wakeup grace indicator set to " 0 " may direct the low power station to wake up immediately after receiving the WUR wakeup frame 1801. [ The wakeup grace indicator set to " 1 " may instruct the low power station to wake up at a predetermined time after receipt of the WUR wakeup frame 1801. [ The preset time may be the wakeup time set in the existing low power operation.
  • the PCR of the low power station can wake up immediately after receiving the WUR wakeup frame 1801, May send a WUR-poll frame 1802 indicating to the access point.
  • the access point may determine that the PCR of the low power station is operating in a wake up state, and in response to the WUR-poll frame 1802, ) To the low power station.
  • the ACK frame 1803 may be transmitted after SIFS from the end of the WUR-poll frame 1802. When the ACK frame 1803 is received from the access point, the low power station may determine that the WUR-poll frame 1802 has been successfully received at the access point.
  • the low-power station is in a WUR delay mode from the end of the ACK frame 1803 until the time point indicated by the timer included in the WUR wakeup frame 1801 or preset in the negotiation procedure of the WUR mode shown in Fig. .
  • the access point may transmit the data frame 1804 to the low power station without transmission of the WUR wake up frame according to the existing low power operation defined in IEEE 802.11.
  • a low power station e. G., PCR
  • a low power station e.g., PCR
  • the access point may determine that the data frame 1804 has been successfully received at the low power station.
  • the operating mode of the low power station may transition from WUR grace mode to WUR mode without an explicit signaling procedure.
  • the operations described above can be performed for a plurality of low power stations.
  • the address field of the WUR wakeup frame 1801 may be set to a group address indicating a plurality of low power stations.
  • the wakeup grace indicator included in the WUR wakeup frame 1801 is set to "0 "
  • the transmission time point of the WUR-poll frame 1802 in a plurality of low power stations may be the same.
  • transmission of WUR-poll frames 1802 may conflict.
  • the access point may send a trigger frame to a plurality of low power stations indicating the transmission resources of the WUR-poll frame 1802. [
  • the transmission resources of the WUR-poll frame 1802 may be different in a plurality of low-power stations.
  • each of the plurality of low power stations may transmit a WUR-poll frame 1802 using the resources indicated by the trigger frame. That is, the WUR-poll frame 1802 can be transmitted in the OFDMA scheme.
  • a WUR wakeup frame may be used to reset the WUR parameter (e.g., on-duration, duty cycle interval) set in the negotiation procedure of the WUR mode shown in FIG.
  • the procedure for resetting the WUR parameter using the WUR wakeup frame can be performed as follows.
  • FIG. 19 is a timing chart showing a first embodiment of a method for resetting WUR parameters in a wireless LAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a low power station (LP STA), and the like.
  • the low power station may belong to the coverage of the access point and may be connected to the access point.
  • the access point and the low power station may be the same or similar to the low power station 500 of FIG.
  • the access point and low power station may further include WUTx as compared to the low power station 500 of FIG.
  • the access point and low power station may be configured the same or similar to the low power station 600 of FIG.
  • the access point and the low power station may operate based on the EDCA scheme shown in FIG.
  • the low power station can operate in the WUR mode or the WUR delay mode based on the WUR parameter set in the negotiation procedure of the WUR mode shown in FIG.
  • the access point can generate a WUR wakeup frame 1901 that includes a WUR reset indicator requesting re-establishment of a WUR parameter that has already been set in the negotiation procedure of the WUR mode, and if the channel state is idle in the carrier sensing period, Up frame 1901 to the low power station.
  • the WUR wakeup frame 1901 may be the same as or similar to the WUR wakeup frame 900 shown in Figure 9 and the WUR reset indicator may be the same as or similar to the TD control field 952-3 of the WUR wakeup frame 900, May be included in the body 952-4.
  • the WURx of the low power station can receive the WUR wakeup frame 1901 from the access point and wake up the PCR of the low power station.
  • the low power station can identify the WUR reset indicator included in the WUR wakeup frame 1901.
  • the low power station may delete the WUR parameters negotiated by the WUR reset indicator in the WUR wakeup frame 1901 and may operate in the normal mode and perform the reset procedure of the access point and the WUR parameters during operation in the normal mode can do.
  • the procedure of resetting the WUR parameter may be performed in the same or similar manner as the embodiment shown in FIG.
  • the low power station may generate a WUR request frame 1902 and may transmit a WUR request frame 1902 to the access point if the channel state is idle in the carrier sensing period.
  • the WUR request frame 1001 may be an action frame and may include information elements (e.g., WUR parameters) necessary for negotiation of the WUR mode between the access point and the low power station.
  • the access point may send an ACK frame 1903 to the low power station in response to the WUR request frame 1902.
  • the ACK frame 1903 may be transmitted after SIFS from the end of the WUR request frame 1902. Alternatively, the transmission of the ACK frame 1903 may be omitted.
  • the access point may generate a WUR response frame 1904 containing the reset WUR parameters and may send a WUR response frame 1904 to the low power station.
  • the WUR response frame 1904 may be an action frame and may include a reset on duration and a duty cycle period. If the WUR response frame 1904 is successfully received from the access point, the low power station may send an ACK frame 1905 to the access point in response to the WUR response frame 1904. [ The ACK frame 1905 may be sent after SIFS from the end of the WUR response frame 1904. Alternatively, transmission of the ACK frame 1905 may be omitted.
  • the low power station may operate based on the WUR parameters included in the WUR response frame 1904. [
  • the operating mode of the low power station depends on the mode transition direction of the WUR request frame 1902 and WUR response frame 1904 used The transition from the normal mode to the WUR mode or the WUR delay mode can be performed.
  • an access point and a plurality of stations may be located in the BSS of the WLAN-based communication system.
  • Each of the access points and the stations can perform communication based on a CSMA / CA (carrier sense multiple access with collision aviodance) scheme. In this case, transmission between the stations may conflict as follows.
  • CSMA / CA carrier sense multiple access with collision aviodance
  • 20 is a timing diagram showing a first embodiment of transmission collision in a WLAN-based communication system.
  • a WLAN-based communication system may include an access point (AP), a station # 1 (STA # 1), a station # 2 (STA # 2)
  • the stations # 1 and # 2 can belong to the coverage of the access point and can be connected to the access point.
  • the access point, station # 1, and station # 2 may be configured the same or similar to the low power station 500 of FIG. Further, the access point, station # 1, and station # 2 may further include WUTx as compared to the low power station 500 of FIG. Alternatively, the access point, station # 1, and station # 2 may be configured the same or similar to the low power station 600 of FIG.
  • the access point, station # 1, and station # 2 may operate based on the EDCA scheme shown in FIG.
  • Station # 1 may be located outside the transmission coverage of Station # 2, and Station # 2 may be located outside the transmission coverage of Station # 1. Therefore, the station # 1 may not detect the signal transmitted from the station # 2, and the station # 2 may not detect the signal transmitted from the station # 1.
  • Station # 1 may transmit uplink (UL) frame # 1 (2001) to the access point when the channel state is idle in the carrier sensing period. For example, UL frame # 1 (2001) can be transmitted at T1.
  • UL frame # 1 (2001) can be transmitted at T1.
  • station # 2 since the station # 2 can perform the carrier sensing operation after the T1 and can not detect the uplink frame # 1 (2001) of the station # 1, the channel state can be determined as the idle state in the carrier sensing period .
  • station # 2 may transmit uplink (UL) frame # 2 2002 to the access point at T2.
  • the uplink frame # 1 (2001) may collide with the uplink frame # 2 (2002) in T2 to T3.
  • the access point can receive the uplink frame # 1 (2001) in T1 to T2 but since the uplink frame # 1 (2001) collides with the uplink frame # 2 (2002) in T2 to T3, 1 & 2 (2001, 2002).
  • the stations # 1 and # 2 may transmit the uplink frames 2001 and 2002 at the same time.
  • the uplink frame # 1 (2001) of the station # 1 may collide with the uplink frame # 2 (2002) of the station # 2, ) May not be all received.
  • a transmission collision (for example, a possibility of a transmission collision) can be judged by a transmitting communication node and a receiving communication node.
  • the transmitting communication node may be a communication node for transmitting a frame
  • the receiving communication node may be a communication node receiving the frame. If a transmission collision (e. G., A possibility of a transmission collision) is determined by the transmitting communication node, the transmitting communication node can abort transmission of the frame.
  • the operation of the transmitting communication nodes causing the receiving communication node to cause a transmission collision are not specified.
  • methods by which a receiving communication node that detects a transmission collision will control the operation of transmitting communication nodes will be described.
  • 21 is a timing chart showing a first embodiment of a collision indicating method in a wireless LAN based communication system.
  • a WLAN-based communication system may include an access point (AP), a station # 1 (STA # 1), a station # 2 (STA # 2), and the like.
  • the stations # 1 and # 2 can belong to the coverage of the access point and can be connected to the access point.
  • Station # 1 may be located outside the transmission coverage of Station # 2
  • Station # 2 may be located outside the transmission coverage of Station # 1.
  • the access point, station # 1, and station # 2 may operate based on the EDCA scheme shown in FIG.
  • the access point, station # 1, and station # 2 may be configured the same or similar to the low power station 600 of FIG.
  • each of the access point, station # 1, and station # 2 may include transceivers # 1 and # 2, and transceiver # 1 may be used for communication in channel # # 2 (CH # 2).
  • Transceiver # 1 may be the PCR 520 shown in FIG. 5, and transceiver # 2 may be WURx 570 shown in FIG.
  • Channel # 1 may be a primary channel, and channel # 2 may be a secondary channel.
  • Station # 1 may transmit UL (UL) frame # 1 2101 to the access point using transceiver # 1 when the channel state is idle in the carrier sensing period.
  • the uplink frame # 1 2101 may be transmitted at T1.
  • the station # 2 can perform the carrier sensing operation after the T1 and can not detect the uplink frame # 1 2101 of the station # 1, so that the channel state can be determined as the idle state in the carrier sensing period.
  • station # 2 can transmit uplink (UL) frame # 2 2102 to the access point at T2 using transceiver # 1.
  • the uplink frame # 1 2101 may collide with the uplink frame # 2 2202.
  • the access point can receive the uplink frame # 1 2101 through the transceiver # 1 from T1 to T2 and can transmit the information elements included in the preamble of the uplink frame # 1 2101 (for example, A destination address, a BSS identifier (BSSID), a time stamp, a length of the uplink frame # 1 2101, and the like. Since the uplink frame # 1 2101 collides with the uplink frame # 2 2102 after T2, the access point can not receive all the uplink frames # 1 and 2 (2001, 2002) through the transceiver # 1 . In this case, the access point can determine that a collision has occurred between the uplink frame # 1 (2101) and the uplink frame # 2 (2102).
  • BSSID BSS identifier
  • the access point can generate a collision directive frame 2103 indicating a collision between the uplink frame # 1 2101 and the uplink frame # 2 2102.
  • the collision instruction frame 2103 may include a collision indicator indicating that a collision between frames occurred and an identifier of an access point that detected a collision between frames (or an ID of a BSS to which the access point belongs).
  • the collision instruction frame 2103 may be a WUR frame.
  • the collision indicator frame 2103 may be configured to be the same as or similar to the WUR wakeup frame 900 shown in FIG.
  • the collision indication frame 2103 includes a legacy preamble (e.g., L-STF 910, L-LTF 920, L-SIG field 930, BPSK-mark 940) (950). (Or the ID of the BSS to which the access point belongs) that detects the collision between the frames and the collision between the frames and detects the collision between the frames is included in the WUR payload 950 of the collision indicator frame 2103 .
  • the legacy preamble of the collision indication frame 2103 may be transmitted over the 20 MHz band and the WUR payload 950 of the collision indication frame 2103 may be transmitted on the narrowband less than 20 MHz.
  • the access point can transmit the collision indicator frame 2103 using the transceiver # 2.
  • the collision instruction frame 2103 may be transmitted in a broadcasting manner.
  • the station # 1 can receive the collision indication frame 2103 through the transceiver # 2 and can determine that a collision between the frames has occurred based on the information elements included in the collision indication frame 2103. [ If the access point (or BSS) indicated by the collision instruction frame 2103 is the same as the access point to which the station # 1 is connected (or the BSS to which the access point belongs), the station # 1 transmits the uplink frame It is possible to stop the transmission of the first frame # 1 2101 and to determine that the transmission of the first frame 2101 fails.
  • the station # 2 can receive the collision instruction frame 2103 through the transceiver # 2, and can determine that a collision between the frames occurs based on the information elements included in the collision instruction frame 2103. [ If the access point (or BSS) indicated by the collision instruction frame 2103 is the same as the access point to which the station # 2 is connected (or the BSS to which the access point belongs), the station # 2 transmits the uplink frame It is possible to stop the transmission of the second frame 2102 and to determine that the transmission of the second frame 2102 fails.
  • the access point can select a station to resume frame transmission according to a preset priority.
  • the access point transmits a resumption indicator indicating the resumption of transmission of the frame and an identifier of the station # 1 (e.g., an identifier indicating the reception target of the trigger frame 2104 ≪ / RTI > may be generated.
  • the access point may transmit the trigger frame 2104 using transceiver # 1.
  • the trigger frame 2104 may be transmitted when the channel state is idle in the carrier sensing period.
  • the station # 1 can receive the trigger frame 2104 through the transceiver # 1 and determine that the transmission of the frame is resumed based on the information elements included in the trigger frame 2104. When the reception subject indicated by the trigger frame 2104 is station # 1, the station # 1 can resume transmission of the uplink frame # 1 2101 through the transceiver # 1.
  • the station # 2 can receive the trigger frame 2104 through the transceiver # 1, and can determine that the transmission of the frame is resumed based on the information elements included in the trigger frame 2104. If the destination to be received indicated by the trigger frame 2104 is not station # 2, station # 2 may discard the trigger frame 2104.
  • the uplink transmission procedure can be initiated by the station.
  • the uplink transmission may be performed by a single user (e.g., a single station) or may be performed by multiple users (e.g., a plurality of stations). Uplink transmission by multiple users can be performed based on the OFDMA scheme.
  • uplink transmission (hereinafter referred to as "multiple uplink transmission") by multiple users may be more efficient than uplink transmission by a single user (hereinafter referred to as "single uplink transmission”) .
  • the access point may determine that multiple uplink transmission is more advantageous than a single uplink transmission. In this case, methods for switching a single uplink transmission to multiple uplink transmission are needed.
  • FIG. 22 is a timing chart showing a first embodiment of a multiple uplink transmission method in a wireless LAN-based communication system.
  • a wireless LAN-based communication system may include an access point (AP), a station # 1 (STA # 1), a station # 2 (STA # 2), and the like.
  • the stations # 1 and # 2 can belong to the coverage of the access point and can be connected to the access point.
  • Station # 1 may be located outside the transmission coverage of Station # 2
  • Station # 2 may be located outside the transmission coverage of Station # 1.
  • the access point, station # 1, and station # 2 may operate based on the EDCA scheme shown in FIG.
  • the access point, station # 1, and station # 2 may be configured the same or similar to the low power station 600 of FIG.
  • each of the access point, station # 1, and station # 2 may include transceivers # 1 and # 2, and transceiver # 1 may be used for communication in channel # # 2 (CH # 2).
  • Transceiver # 1 may be the PCR 520 shown in FIG. 5, and transceiver # 2 may be WURx 570 shown in FIG.
  • Channel # 1 may be the primary channel, and channel # 2 may be the secondary channel.
  • channel # 2 may be a channel separate from channel # 1, and the secondary channel may be a WUR channel or a WUR discovery channel.
  • Station # 1 may transmit uplink (UL) frame # 1 2201 to the access point using transceiver # 1 when the channel state is idle in the carrier sensing period.
  • the access point can receive the UL frame # 1 2201 through the transceiver # 1 and can transmit the information elements included in the preamble of the UL frame # 1 2201 (for example, a source address, a destination address, a BSSID , Time stamp, length of uplink frame # 1 (2201), etc.).
  • the access point may multiply the efficiency of a single uplink transmission in consideration of the information elements included in the preamble of the UL frame # 1 2201, the buffer status of other stations (e.g., the stations # 1 to # 2) It can be compared with the efficiency of link transmission.
  • the access point can generate a transmission stop frame 2202 indicating the transmission stop of the UL frame # 1 2201.
  • the transmission stop frame 2202 may include an identifier (e.g., an identifier of the station # 1) indicating the station to stop the transmission of the uplink frame and an indicator for instructing stop of transmission of the uplink frame.
  • the transmission stop frame 2202 may further include an indicator indicating that a single uplink transmission is switched to multiple uplink transmission.
  • the transmission stop frame 2202 may be a WUR frame.
  • the transmission stop frame 2202 may be configured to be the same as or similar to the WUR wakeup frame 900 shown in Fig.
  • the transmission stop frame 2202 includes a legacy preamble (e.g., L-STF 910, L-LTF 920, L-SIG field 930, BPSK-mark 940) (950).
  • An indicator for instructing the station to stop the transmission of the uplink frame, an indicator for instructing the suspension of the transmission of the uplink frame, and an indicator for instructing switching of the single uplink transmission to the multiple uplink transmission, May be included in the WUR payload 950.
  • the legacy preamble of the transmission stop frame 2202 may be transmitted over the 20 MHz band and the WUR payload 950 of the transmission stop frame 2202 may be transmitted over the narrow band less than 20 MHz.
  • the access point can transmit the transmission stop frame 2202 to the station # 1 using the transceiver # 2.
  • the station # 1 can receive the transmission stop frame 2202 through the transceiver # 2 and can stop the transmission of the uplink frame # 1 2201 based on the information elements included in the transmission stop frame 2202 . Therefore, the station # 1 can stop the transmission of the UL frame # 1 (2201).
  • the station # 1 may determine that a single uplink transmission is switched to multiple uplink transmission based on the information elements included in the transmission stop frame 2202. [
  • the access point can transmit a trigger frame 2203 that triggers the multiple uplink transmission when the channel state is idle in a predetermined interval from the end time of the UL frame # 1 2201.
  • Trigger frame 2203 may be transmitted via transceiver # 1 of the access point.
  • the preset interval may be SIFS, DIFS, PIFS, AIFS, or any time interval.
  • Trigger frame 2203 includes an indicator indicating that multiple uplink transmissions are to be initiated, an identifier of stations participating in multiple uplink transmissions (e.g., an identifier of group # 1 or 2, a group identifier), and multiple uplink transmissions And information indicating the resources allocated to stations participating in the network. That is, the multiple uplink transmission opportunity can be set by the trigger frame 2203.
  • the length of the multiple uplink transmission opportunity may be set to be equal to or less than the length of the UL frame # 1 (2201) obtained from the preamble of the UL frame # 1 (2201).
  • the length of the multiple uplink transmission opportunity can be set based on the buffer status of stations participating in multiple uplink transmissions.
  • the stations # 1 and # 2 can receive the trigger frame 2203 through the transceiver # 1 and confirm the information included in the trigger frame 2203.
  • station # 1 may determine that station # 1 participates in multiple uplink transmissions when the identifier of the station included in trigger frame 2203 is identical to the identifier of station # 1, (E. G., A resource for multiple uplink transmissions) indicated by the user.
  • the station # 2 can determine that the station # 2 participates in the multiple uplink transmission when the identifier of the station included in the trigger frame 2203 is the same as the identifier of the station # 2, (E. G., Resources for multiple uplink transmissions). ≪ / RTI >
  • the station # 1 can transmit the uplink frame # 1 2201 from the resource indicated by the trigger frame 2203 using the transceiver # 1 and the station # 2 can transmit to the trigger frame 2203 using the transceiver # 2 2204 in the resource indicated by the uplink frame # 2 (2204).
  • the access point can receive the UL frames 2201 and 2204 through the transceiver # 1 and receive the block ACK frames 2205 and 2205 in response to the UL frames # Can be transmitted using transceiver # 1.
  • the station # 1 can determine that the UL frame # 1 2201 has been successfully received at the access point.
  • the station # 2 can determine that the UL frame # 2 2204 has been successfully received at the access point have.
  • a communication node e.g., an access point, a station
  • the channel information element may be set as follows.
  • FIG. 23 is a block diagram showing a first embodiment of a channel information element in a WLAN-based communication system.
  • a channel can be classified into a PCR channel, a WUR channel, and a discovery channel.
  • the PCR channel may be used for basic operations of the WLAN (e.g., management / control / transmission / reception of data frames).
  • the WUR channel may be used for sending and receiving WUR frames (e.g., WUR wakeup frames, collision indicating frames, transmission stop frames).
  • the discovery channel may be used for transmission and reception of a discovery frame for searching for another communication node.
  • the PCR channel may be a primary channel, and each of the WUR channel and the discovery channel may be a secondary channel.
  • the channel information element 2300 may include a PCR channel field 2301, a WUR channel field 2302, and a discovery channel field 2303.
  • the PCR channel field 2301 may indicate a PCR channel used by the communication node.
  • the WUR channel field 2302 may indicate the WUR channel used by the communication node.
  • the discovery channel field 2303 may indicate the discovery channel used by the communication node.
  • the communication node may transmit a frame (e.g., a beacon frame) including the channel information element 2300 in a broadcast manner.
  • the beacon frame may be a WUR beacon frame or a PCR beacon frame.
  • the channel information element 2300 may not include information of a channel through which a frame including the channel information element 2300 is transmitted. For example, when a frame containing a channel information element 2300 is transmitted on a PCR channel, the corresponding channel information element 2300 may include a WUR channel field 2302 and a discovery channel field 2303.
  • the communication node may change the channel based on the channel information element 2300 received from another communication node.
  • a channel-specific token value can be set as shown in Table 3 below.
  • the communication node # 1 can receive the channel information element 2300 from the communication node # 2, and when the PCR channel indicated by the channel information element 2300 of the communication node # 2 is the same as the PCR channel of the communication node # 1
  • the token value of the PCR channel can be increased.
  • the number of communication nodes using the PCR channel indicated by the channel information element 2300 is equal to or less than the coexistence threshold value ,
  • the token value of the PCR channel may not increase.
  • the coexistence threshold may indicate the number of communication nodes that can coexist in one PCR channel.
  • the communication node # 1 can change the PCR channel.
  • the communication node # 1 can change the current PCR channel to the PCR channel having the lowest usage rate among the candidate PCR channels.
  • the communication node # 1 can receive the channel information element 2300 from the communication node # 2, and when the PCR channel indicated by the channel information element 2300 of the communication node # 2 is the same as the PCR channel of the communication node # 1
  • the token value of the WUR channel may be increased. That is, the token value of the WUR channel may increase when the PCR channel is overlapped instead of the WUR channel.
  • the PCR channel indicated by the channel information element 2300 is the same as the PCR channel of the communication node # 1, the number of communication nodes using the PCR channel indicated by the channel information element 2300 is equal to or less than the coexistence threshold value , The token value of the WUR channel may not increase.
  • the coexistence threshold may indicate the number of communication nodes that can coexist in one PCR channel.
  • the communication node # 1 can change the WUR channel.
  • the communication node # 1 can change the current WUR channel to the WUR channel having the lowest usage rate among the candidate WUR channels.
  • the communication node # 1 can receive the channel information element 2300 from the communication node # 2, and when the PCR channel indicated by the channel information element 2300 of the communication node # 2 is the same as the PCR channel of the communication node # 1
  • the token value of the discovery channel may be increased. That is, the token value of the discovery channel may increase when the PCR channel is overlapped instead of the discovery channel.
  • the communication node # 1 can change the discovery channel.
  • the communication node # 1 may change the current discovery channel to the discovery channel having the highest utilization among the candidate discovery channels.
  • the discovery channel may be changed in consideration of a preset priority (for example, priority for each candidate discovery channel).
  • the methods according to the present invention can be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination.
  • the program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention or may be available to those skilled in the computer software.
  • Examples of computer readable media include hardware devices that are specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
  • Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware devices described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Abstract

L'invention concerne un procédé de fonctionnement d'un nœud de communication prenant en charge un mode basse puissance (LP) dans un réseau local (LAN) sans fil. Un procédé de fonctionnement d'une station (STA) comprend les étapes consistant à : faire fonctionner la station dans un mode WUR; recevoir, d'un point d'accès (AP), une trame de demande de suspension de mode WUR indiquant une transition du mode WUR à un mode de suspension WUR; et faire basculer le mode de fonctionnement de la station du mode WUR au mode de suspension WUR sur la base de la trame de demande de suspension de mode WUR. Par conséquent, les performances d'un système de communication peuvent être améliorées.
PCT/KR2018/014853 2017-11-28 2018-11-28 Procédé de fonctionnement d'un nœud de communication prenant en charge un mode basse puissance dans un réseau local sans fil WO2019107931A1 (fr)

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