WO2015170831A1 - 무선랜에서 파워 세이브 모드 기반의 동작 방법 및 장치 - Google Patents
무선랜에서 파워 세이브 모드 기반의 동작 방법 및 장치 Download PDFInfo
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- WO2015170831A1 WO2015170831A1 PCT/KR2015/003389 KR2015003389W WO2015170831A1 WO 2015170831 A1 WO2015170831 A1 WO 2015170831A1 KR 2015003389 W KR2015003389 W KR 2015003389W WO 2015170831 A1 WO2015170831 A1 WO 2015170831A1
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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
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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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
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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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
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- 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 communication, and more particularly, to a method and apparatus for operating based on a power save mode in a wireless local area network (WLAN).
- WLAN wireless local area network
- a power save mechanism (or a power save mode) may be used to increase the lifetime of a WLAN STA.
- the STA operating based on the power saving mode may operate in an awake state or a doze state for power saving.
- the awake state is a state in which normal operation of the STA such as transmission or reception of a frame or channel scanning is possible.
- the doze state dramatically reduces power consumption, making it impossible to transmit or receive a frame and to perform channel scanning.
- the STA operating in the power saving mode may be in the doze state and, if necessary, switch to the awake state to reduce power consumption.
- the STA may operate by acquiring information on the existence of a frame pending at the AP and periodically switching to an awake state to receive the frame held at the AP.
- the AP may obtain information on the awake state operation timing of the STA, and transmit information on the presence or absence of a frame pending to the AP according to the awake state operation timing of the STA.
- the STA in the doze state may receive a beacon frame by periodically switching from the doze state to the awake state in order to receive information on the existence of a frame to be received from the AP.
- the AP may inform about the existence of a frame to be transmitted to each STA based on a traffic indication map (TIM) included in the beacon frame.
- TIM is used to inform the existence of a unicast frame to be transmitted to the STA
- DTIM delivery traffic indication map
- An object of the present invention is to provide a power save mode based operation method in a WLAN.
- Still another object of the present invention is to provide an operation device based on a power save mode in a WLAN.
- An STA station
- An STA is a power save mode based on an access point (AP) and a traffic indication map (TIM).
- the STA operating in the TIM based power save mode is an awake state in a doze state based on a transmission period of a beacon frame
- Receiving a first downlink frame from the AP receiving, by the STA, operation mode configuration information instructing to switch from the TIM based power save mode to an active mode from the AP; and STA may include receiving a second downlink frame from the AP based on the active mode, wherein the first downlink frame and the second The downlink frame includes data for a live video streaming service, and the operation mode setting information may be generated based on network state information between the STA and the AP.
- a station (station) operating in a power save mode is implemented with a radio frequency (RF) unit for transmitting or receiving a radio signal; And a processor operatively connected to the RF unit, wherein the processor performs an initial configuration procedure for setting an AP and a TIM based power save mode. And operate in the TIM-based power save mode based on the initial configuration procedure to switch from a doze state to an awake state based on a transmission period of a beacon frame, thereby performing a first downlink from the AP. Receives a frame and receives operation mode setting information indicating the transition from the TIM-based power save mode to an active mode from the AP.
- RF radio frequency
- the operation mode setting information may be generated based on network state information between the STA and the AP.
- Real-time video streaming service may be possible while saving power of the STA.
- WLAN wireless local area network
- FIG. 2 is a conceptual diagram illustrating a scanning method in a WLAN.
- FIG. 3 is a conceptual diagram illustrating an authentication procedure and a combined procedure performed after a scanning procedure of an AP and an STA.
- FIG. 4 is a conceptual diagram illustrating a beacon frame-based power save method.
- FIG. 5 is a conceptual diagram illustrating a beacon frame-based power save method.
- FIG. 6 is a conceptual diagram illustrating a real-time video streaming method to an STA according to an embodiment of the present invention.
- FIG. 7 is a conceptual diagram illustrating an initial operation for a TIM based power save mode operation of an STA according to an embodiment of the present invention.
- FIG. 8 is a conceptual diagram illustrating a method of determining a network state according to an embodiment of the present invention.
- FIG. 9 is a conceptual diagram illustrating a method of setting an operation mode of an STA by an AP according to an embodiment of the present invention.
- FIG. 10 is a conceptual diagram illustrating a method of setting an operation mode of an STA by an AP according to an embodiment of the present invention.
- FIG. 11 is a conceptual diagram illustrating a method of setting an operation mode of an STA according to an embodiment of the present invention.
- FIG. 12 is a conceptual diagram illustrating a method of setting an operation mode of an STA according to an embodiment of the present invention.
- FIG. 13 is a conceptual diagram illustrating a method of setting an operation mode of an STA according to an embodiment of the present invention.
- FIG. 14 is a conceptual diagram illustrating a frame for setting an operation mode of an STA according to an embodiment of the present invention.
- 15 is a conceptual diagram illustrating a PPDU format for delivering a frame according to an embodiment of the present invention.
- 16 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
- WLAN wireless local area network
- FIG. 1 shows the structure of an infrastructure BSS (Basic Service Set) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.
- BSS Basic Service Set
- IEEE Institute of Electrical and Electronic Engineers 802.11
- the WLAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter, BSS).
- BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area.
- the BSS 105 may include one or more joinable STAs 105-1 and 105-2 to one AP 130.
- the BSS may include at least one STA, APs 125 and 130 that provide a distribution service, and a distribution system DS that connects a plurality of APs.
- the distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set.
- ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110.
- APs included in one ESS 140 may have the same service set identification (SSID).
- the portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).
- a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130.
- a network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
- FIG. 1 is a conceptual diagram illustrating an IBSS.
- the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-4, and 155-5 are managed in a distributed manner. In the IBSS, all STAs 150-1, 150-2, 150-3, 155-4, and 155-5 may be mobile STAs, and access to a distributed system is not allowed, thus making a self-contained network. network).
- a STA is any functional medium that includes a medium access control (MAC) and physical layer interface to a wireless medium that is compliant with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. May be used to mean both an AP and a non-AP STA (Non-AP Station).
- MAC medium access control
- IEEE Institute of Electrical and Electronics Engineers
- the STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit or simply a user.
- WTRU wireless transmit / receive unit
- UE user equipment
- MS mobile station
- UE mobile subscriber unit
- It may also be called various names such as a mobile subscriber unit or simply a user.
- the data (or frame) transmitted from the AP to the STA is downlink data (or downlink frame), and the data (or frame) transmitted from the STA to the AP is uplink data (or uplink frame).
- the transmission from the AP to the STA may be expressed in terms of downlink transmission, and the transmission from the STA to the AP may be expressed in terms of uplink transmission.
- FIG. 2 is a conceptual diagram illustrating a scanning method in a WLAN.
- a scanning method may be classified into passive scanning 200 and active scanning 250.
- the passive scanning 200 may be performed by the beacon frame 230 periodically broadcasted by the AP 200.
- the AP 200 of the WLAN broadcasts the beacon frame 230 to the non-AP STA 240 every specific period (for example, 100 msec).
- the beacon frame 230 may include information about the current network.
- the non-AP STA 240 receives the beacon frame 230 that is periodically broadcast to receive the network information to perform scanning for the AP 210 and the channel to perform the authentication / association (authentication / association) process Can be.
- the passive scanning method 200 only needs to receive the beacon frame 230 transmitted from the AP 210 without requiring the non-AP STA 240 to transmit the frame.
- passive scanning 200 has the advantage that the overall overhead incurred by the transmission / reception of data in the network is small.
- scanning can be performed manually in proportion to the period of the beacon frame 230, the time taken to perform scanning is relatively increased compared to the active scanning method.
- beacon frame For a detailed description of the beacon frame, see IEEE Draft P802.11-REVmb TM / D12, November 2011 'IEEE Standard for Information Technology Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications (hereinafter referred to as IEEE 802.11) 'are described in 8.3.3.2 beacon frame.
- IEEE 802.11 ai may additionally use other formats of beacon frames, and these beacon frames may be referred to as fast initial link setup (FILS) beacon frames.
- a measurement pilot frame may be used in a scanning procedure as a frame including only some information of a beacon frame. Measurement pilot frames are disclosed in the IEEE 802.11 8.5.8.3 measurement pilot format.
- a FILS discovery frame may be defined.
- the FILS discovery frame is a frame transmitted between transmission periods of a beacon frame at each AP and may be a frame transmitted with a shorter period than the beacon frame. That is, the FILS discovery frame is a frame transmitted with a period smaller than the transmission period of the beacon frame.
- the FILS discovery frame may include identifier information (SSID, BSSID) of the AP transmitting the detection frame.
- the FILS discovery frame may be transmitted before the beacon frame is transmitted to the STA to allow the STA to detect in advance that the AP exists in the corresponding channel.
- the interval at which a FILS discovery frame is transmitted from one AP is called a FILS discovery frame transmission interval.
- the FILS discovery frame may include part of information included in the beacon frame and be transmitted.
- the non-AP STA 290 may transmit the probe request frame 270 to the AP 260 to proactively perform scanning.
- the AP 260 After receiving the probe request frame 270 from the non-AP STA 290, the AP 260 waits for a random time to prevent frame collision, and then includes network information in the probe response frame 280. may transmit to the non-AP STA 290. The non-AP STA 290 may obtain network information based on the received probe response frame 280 and stop the scanning process.
- the probe request frame 270 is disclosed in IEEE 802.11 8.3.3.9 and the probe response frame 280 is disclosed in IEEE 802.11 8.3.3.10.
- the AP and the non-AP STA may perform an authentication procedure and an association procedure.
- FIG. 3 is a conceptual diagram illustrating an authentication procedure and a combined procedure performed after a scanning procedure of an AP and an STA.
- an authentication procedure and a combining procedure with one of the scanned APs may be performed.
- Authentication and association procedures can be performed, for example, via two-way handshaking.
- the left side of FIG. 3 is a conceptual diagram illustrating an authentication and combining procedure after passive scanning, and the right side of FIG. 3 is a conceptual diagram showing an authentication and combining procedure after active scanning.
- the authentication procedure and the association procedure are based on an authentication request frame 310 / authentication response frame 320 and an association request frame 330 regardless of whether active scanning method or passive scanning is used.
- / Association response frame 340 may be equally performed by exchanging an association response frame 340 between the AP 300, 350 and the non-AP STA 305, 355.
- the non-AP STAs 305 and 355 may transmit the authentication request frame 310 to the APs 300 and 350.
- the AP 300 or 350 may transmit the authentication response frame 320 to the non-AP STAs 305 and 355 in response to the authentication request frame 310.
- Authentication frame format is disclosed in IEEE 802.11 8.3.3.11.
- the non-AP STAs 305 and 355 may transmit an association request frame 330 to the APs 300 and 305.
- the APs 305 and 355 may transmit the association response frame 340 to the non-AP STAs 300 and 350.
- the association request frame 330 transmitted to the AP includes information on the capabilities of the non-AP STAs 305 and 355. Based on the performance information of the non-AP STAs 305 and 355, the APs 300 and 350 may determine whether support for the non-AP STAs 305 and 355 is possible.
- the APs 300 and 350 may transmit the combined response frame 340 to the non-AP STAs 305 and 355.
- the association response frame 340 may include whether or not to accept the association request frame 340, and the capability information that can be supported by the association response frame 340.
- Association frame format is disclosed in IEEE 802.11 8.3.3.5/8.3.3.6.
- association procedure After the association procedure is performed between the AP and the non-AP STA, normal data transmission and reception may be performed between the AP and the non-AP STA. If the association procedure between the AP and the non-AP STA fails, the association procedure with the AP may be performed again or the association procedure with another AP may be performed again based on the reason for the association failure.
- the STA When the STA is associated with the AP, the STA may be assigned an association identifier (AID) from the AP.
- the AID assigned to the STA may be a unique value within one BSS, and the current AID may be one of 1 to 2007. 14bit is allocated for AID and can be used as the value of AID up to 16383. However, the value of 2008 ⁇ 16383 is reserved.
- a power save mechanism (power save mode) is provided to increase the lifespan of an STA in a WLAN.
- the STA operating based on the power save mode may increase the operating life of the STA by reducing power consumption of the STA while operating by switching between an awake state and a doze state.
- An STA operating based on the active mode may maintain an awake state.
- the active mode may include a TXOP power save mode for switching between an awake state and a doze state based on information on a transmission opportunity (TXOP), but for convenience of description, an STA operating in an active mode maintains an awake state.
- TXOP transmission opportunity
- the STA in the awake state may perform normal operations such as transmission or reception of a frame and channel scanning.
- the STA in the doze state does not transmit or receive a frame and does not perform channel scanning to reduce power consumption.
- the STA operating in the power save mode may remain in the doze state to reduce power consumption and, if necessary, switch to an awake state (or transition) to communicate with the AP.
- the power consumption of the STA may decrease and the lifetime of the STA may also increase.
- transmission or reception of the frame of the STA is impossible. If there is an uplink frame pending in the STA, the STA operating in the power save mode switches to the active state from the doze state, or the STA operating in the power save mode switches from the power save mode to the active mode to change the uplink frame. Can transmit to the AP. On the contrary, if there is a pending frame to be transmitted to the STA in the doze state, the AP cannot transmit the frame to the STA until the STA switches to the awake state.
- the STA operating in the power save mode may occasionally switch from the doze state to the awake state and receive information on whether there is a frame pending for the STA from the AP.
- the AP may transmit information on the existence of downlink data pending for the STA to the STA in consideration of the transition time to the awake state of the STA operating in the power save mode.
- an STA operating in a power save mode may periodically switch from a doze state to an awake state to receive a beacon frame in order to receive information on the existence of a frame pending for the STA.
- the beacon frame is a frame used for passive scanning of the STA and may include information on the capability of the AP.
- the AP may transmit a beacon frame to the STA periodically (eg, 100 msec).
- FIG. 4 is a conceptual diagram illustrating a beacon frame-based power save method.
- the AP may periodically transmit a beacon frame
- the STA operating in the power save mode may periodically switch from the doze state to the awake state to receive the beacon frame in consideration of the transmission timing of the beacon frame.
- the beacon frame-based power save method may also be expressed in terms of a TIM-based power save mode.
- the beacon frame may include a traffic indication map element (TIM element).
- the TIM element may be used to transmit information on downlink data for the STA pending to the AP.
- the TIM element may include information on downlink data pending for the STA on a bitmap basis.
- the TIM element may be divided into a TIM or a delivery TIM (DTIM).
- the TIM may indicate the presence of pending downlink data to be transmitted to the STA on unicast basis.
- the DTIM may indicate the presence of pending downlink data to be transmitted on a broadcast / multicast basis.
- FIG. 4 discloses a method in which an AP transmits a downlink frame based on an immediate response to a power saving (poll) -poll frame.
- the STA may receive information on the existence of downlink data pending for the STA from the AP based on the TIM of the beacon frame 400.
- the STA may transmit the PS-poll frame 410 to the AP.
- the AP may receive the PS-poll frame 410 from the STA and transmit the downlink frame 420 to the STA in an immediate response to the PS-poll frame 410.
- the immediate response to the PS-poll frame of the AP may be performed after receiving the PS-poll frame and short interframe space (SIFS).
- SIFS short interframe space
- the STA may transmit the ACK frame 430 in response to the downlink frame.
- the STA operating in the power save mode may be switched back to the doze state (or transition).
- FIG. 4 shows a method of transmitting a downlink frame of an AP based on a deferred response to a PS-poll frame.
- the STA may receive information about the existence of downlink data pending for the STA from the AP based on the TIM of the beacon frame 440.
- the STA may transmit the PS-poll frame 450 to the AP.
- the AP may receive the PS-poll frame 450 from the STA and transmit the ACK frame 460 to the STA in response to the PS-poll frame 450.
- the AP may transmit a downlink frame 470 including the pending downlink data to the STA after transmission of the ACK frame 460.
- the STA may monitor the downlink frame 470 transmitted by the AP to the STA after receiving the ACK frame 460.
- the STA operating in the power save mode may be switched (or transitioned) from the awake state to the doze state again.
- FIG. 5 is a conceptual diagram illustrating a beacon frame-based power save method.
- the DTIM is transmitted through the beacon frame 500.
- Beacon frame 500 may include a DTIM.
- the DTIM may indicate the presence of pending downlink data to be transmitted on a broadcast / multicast basis.
- the AP may transmit a beacon frame 500 including the DTIM to the STA.
- the STA may maintain the awake state without transmitting the PS-poll frame and monitor the transmission of the downlink frame 520.
- the AP may transmit the downlink frame 520 to the STA through a multicast method or a broadcast method.
- the transmission from the AP to the STA may be expressed by the term downlink transmission.
- Each of the PPDUs, frames, and data transmitted through downlink transmission may be represented by the terms downlink PPDU, downlink frame, and downlink data.
- the PPDU may be a data unit including a PPDU header and a physical layer service data unit (PSDU) (or MAC protocol data unit (MPDU)).
- PSDU physical layer service data unit
- MPDU MAC protocol data unit
- the PPDU header may include a PHY header and a PHY preamble
- the PSDU (or MPDU) may include or indicate a frame.
- the PHY header may be referred to as a physical layer convergence protocol (PLCP) header in another term, and the PHY preamble may be expressed as a PLCP preamble in another term.
- PLCP physical layer convergence protocol
- the transmission from the STA to the AP may be expressed by the term uplink transmission.
- Each of the PPDUs, frames, and data transmitted through uplink transmission may be expressed in terms of uplink PPDU, uplink frame, and uplink data.
- a real-time video streaming method from the AP to the STA is disclosed.
- the real-time video streaming from the AP to the STA is assumed and described, but the real-time video streaming from the STA to the AP in the opposite direction is also possible, and such an embodiment may also be included in the scope of the present invention.
- Video streaming for transmission of video data may be classified into a buffered video streaming method and a live video streaming method.
- playback of video data may be performed before completion of transmission of the entire video data.
- New video data may be received by the STA, decoded, and played on the STA while playback of the video data received by the STA is performed for seamless video streaming.
- video data may be received in advance (prebuffered) before playback. Therefore, even when network congestion occurs for a certain time, continuous video data may be reproduced.
- Real-time video streaming may be divided into live interactive video transmission and live non-interactive video transmission.
- Real-time interactive video transmission may be used for two-way communication, such as video conferencing, and real-time non-interactive video transmission may be used for transmission of video data in one direction.
- the delay for transmitting and playing video data should be less than 150ms.
- Delays for the transmission and playback of video data may include one-way delays, end-to-end delays, video encoding, delays for network transmission and video decoding, and the like.
- a certain amount of lag may be allowed between the generation of video data through the capture of live events and the playback of the video data generated at the receiving end.
- a delay enough to receive and play video data to be played back in advance is not allowed. Therefore, the quality of real-time video streaming may be determined according to network congestion.
- video data transmitted through downlink may be data for 30 frames per second.
- the STA may operate based on a TIM-based power save mode using a PS-poll frame.
- TIM-based power save mode can also be expressed in terms of PS-poll power save mode.
- the STA operating in the TIM-based power save mode may be switched to the awake state in the transmission period of the beacon frame to receive the video data from the AP and then to the doze state.
- the STA may decode and play the received video data until transmission of the next beacon frame, and switch to the awake state again when receiving the next beacon frame to receive the video data from the AP.
- Network congestion must be low for real-time video streaming of an STA operating in a TIM-based power save mode. If the congestion of the network is high, the STA may not receive video data from the AP due to congestion of the network after switching to an awake state, and continuous video streaming may not be possible.
- An embodiment of the present invention discloses an operation of a TIM based power save mode or an active mode of an STA in consideration of network congestion. For example, when the network congestion is low, the STA operates in a TIM-based power save mode to transition between the awake state and the doze state. On the contrary, when the network congestion is high, the STA operates in the active mode and awake. Can be maintained.
- the STA may perform an operation by switching the TIM based power save mode and the active mode according to the network congestion degree.
- Network congestion may be determined based on wide area network (WAN) metric information transmitted by the AP.
- the WAN metric information may be generated based on an access network query protocol (ANQP) and transmitted to the AP.
- ANQP may be a protocol for transmitting information on network status to an STA (or AP).
- the STA (or AP) may obtain information about the network state by querying the information about the network based on the ANQP.
- the information about the network may include information about network congestion, capability of the network, authentication type, and the like.
- the STA assumes an STA that receives a real-time video streaming service.
- FIG. 6 is a conceptual diagram illustrating a real-time video streaming method to an STA according to an embodiment of the present invention.
- FIG. 6 illustrates a real-time video streaming method from an AP to an STA.
- an application for real-time video streaming may be executed on the STA.
- the STA may detect an operation for real-time video streaming and set the operation mode to the TIM based power save mode.
- the STA may perform an initialization procedure for operating in a TIM based power save mode (step S600).
- An initial operation for a TIM-based power save mode operation of an STA may be performed based on transmission and reception of an ADDTS request frame (ADDTS) request frame and an ADDTS response frame between the STA and the AP. have.
- An initial operation for the TIM based power save mode of the STA will be described in detail later.
- the STA may switch or maintain the operation mode based on the network congestion level (step S610).
- An AP that transmits video data to an STA based on real-time video streaming may detect and predict network congestion.
- the AP may transmit information about network congestion to the STA.
- the AP may transmit information about network congestion to the STA through a beacon frame.
- the STA may determine whether to switch from the TIM-based power save mode to the active mode based on the information on network congestion. If it is determined that the network congestion is high, the STA may switch from the TIM-based power save mode to the active mode and receive video data. On the contrary, if it is determined that the network congestion is low, the STA may receive the video data from the AP by maintaining the TIM-based power save mode.
- the AP may directly indicate an operation mode of the STA. For example, when the network congestion is high, the AP may instruct (or request) to switch the operation mode of the STA from the TIM based power save mode to the active mode. In contrast, when the network congestion is low, the AP may instruct (or request) to maintain the operating mode of the STA in the TIM based power save mode. Alternatively, the AP may transmit information about network congestion to the STA and allow the operation mode to be switched according to the operation mode switching request of the STA. This will be described later in detail.
- FIG. 7 is a conceptual diagram illustrating an initial operation for a TIM based power save mode operation of an STA according to an embodiment of the present invention.
- a TIM based power save mode is set based on an ADDTS request frame and an ADDTS response frame.
- the ADDTS request frame may include a TSPEC element as an information element.
- the TSPEC element of the ADDTS request frame is the IEEE Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY). It is described in 8.4.2.29 TSPEC element of the specification (hereinafter IEEE 802.11 spec).
- TS info field 700 included in the TSPEC element is also disclosed in Figure 8-197 of the 8.4.2.29 TSPEC element of the IEEE 802.11 spec.
- the STA may set the TIM-based power save mode based on the automatic power save delivery (APSD) field 710 and the schedule field 720 included in the TS info field 700.
- APSD automatic power save delivery
- the STA sends an ADDTS request frame including a TS info field 700 including an APSD field 710 set to 0 and a schedule field 720 set to 0 and a power save field 730 set to 1 in a MAC header to the AP.
- Can transmit The structure of the MAC header is described in 8.2.4.1 frame control field of the IEEE 802.11 specification.
- the STA may request an operation in the TIM based power save mode by transmitting an ADDTS request frame including the field configured as described above.
- the AP may receive an ADDTS request frame including the field configured as described above from the STA and determine whether the STA operates in a TIM-based power save mode.
- the AP may determine an operation of the STA in a TIM based power save mode and transmit an ADDTS response frame to the STA.
- the ADDTS response frame may also include a TSPEC element.
- the AP sends an ADDTS response frame including a TS info field 700 including an APSD field 710 set to 0 and a schedule field 720 set to 0, and a power save field 730 set to 1 in a MAC header to the STA. Can transmit
- the STA may receive an ADDTS response frame from the AP and operate in a TIM based power save mode.
- FIG. 8 is a conceptual diagram illustrating a method of determining a network state according to an embodiment of the present invention.
- a method of determining a network state (eg, network congestion) of an STA and / or an AP is disclosed.
- BSS load information may be used to determine the network state.
- the AP and / or STA may determine network congestion based on BSS load information, WAN metric information, and the like.
- the BSS load information may include channel utilization information and STA count information.
- the channel utilization information may include information about the time when the channel is busy.
- the channel utilization information may include information about a ratio of time when the channel is busy sensed during a time corresponding to a specific beacon transmission interval.
- the STA count information may include information on the total number of STAs coupled to the current BSS.
- the WAN metric information includes WAN information 800, downlink speed information 810, uplink speed information 820, downlink load information 830, uplink load information 840, and local measurement duration information 850. It may include.
- the WAN information 800 may include information about an up / down / test link status and a symmetric link.
- the downlink speed information 810 may include information about the downlink speed in the WAN.
- the uplink speed information 820 may include information about uplink speed in the WAN.
- the downlink load information 830 may include information about a rate at which WAN downlink is used.
- the uplink load information 840 may include information about a rate at which WAN uplink is used.
- the local measurement duration information 850 may include information on the duration of the downlink load and the uplink load.
- the AP may transmit the above BSS load information and / or WAN metric information to the STA through a beacon frame.
- the STA may determine the network congestion based on the BSS load information and / or the WAN metric information and determine the transition between the TIM based power save mode and the active mode.
- the AP may determine network congestion based on BSS load information and / or WAN metric information and determine switching between a TIM based power save mode and an active mode.
- the AP may determine network congestion based on the BSS load information as follows.
- the AP may be said to have a high network congestion rate when the ratio of time when the channel acquired based on the channel utilization information is busy is more than a predetermined threshold.
- the AP may say that network congestion is high when the total number of STAs coupled to the current BSS acquired based on the STA count information is greater than or equal to a predetermined threshold value.
- the AP may determine network congestion based on WAN metric information as follows.
- each of the downlink speed information and the uplink speed obtained based on the downlink speed information uplink speed information is greater than each of the set threshold values, and the downlink load information and the uplink load information are both If it is smaller than each of the set thresholds, it may be determined that network congestion is low.
- the AP is said to have low network congestion when the downlink speed obtained based on the downlink speed information is greater than each of the set thresholds and the downlink load information is less than each of the set thresholds. You can judge.
- Each of the thresholds for determining network congestion may be set to a fixed value in advance in the AP, or may be a value set differently according to implementation in the AP.
- FIG. 9 is a conceptual diagram illustrating a method of setting an operation mode of an STA by an AP according to an embodiment of the present invention.
- FIG. 9 a method of setting an operating state (TIM-based power save mode or active mode) of an STA by an AP is disclosed.
- the AP may set an operation state of the STA through a power management bitmap 920 corresponding to the TIM bitmap 900.
- Each bit included in the power management bitmap 920 may correspond to each bit of the TIM bitmap 900 indicating information about data held for the STA.
- the power save mode eg, For example, the operation of the TIM based power save mode
- an 8-bit TIM bitmap 900 and an 8-bit power management bitmap 920 corresponding to the 8-bit TIM bitmap 900 may be defined.
- the 8-bit TIM bitmap 900 may indicate the presence of pending downlink data for each of STA1 to STA8 as '11110000'.
- the 8-bit TIM bitmap 900 may indicate downlink data pending on each of the STA1, the STA2, the STA3, and the STA4.
- the 8-bit power management bitmap 920 may correspond to the TIM bitmap 900 as '11001111' and may indicate an operation state of each of the STA1 to STA8. That is, the 8-bit power management bitmap 920 may indicate that STA1 and STA2 operate in the power save mode and STA3 and STA4 operate in the active mode among the STA1 to STA4 having the pending downlink data.
- the AP may generate an 8-bit TIM bitmap 900 in consideration of existence of downlink data pending for each of STA1 to STA8.
- the AP is a power management bitmap 920 for setting an operation state of each STA (STA1 to STA4) having the pending downlink data and each STA having the pending downlink data in consideration of channel congestion between the APs. Can be generated.
- the STA1 and STA2 may be instructed to perform the operation in the power save mode through the power management bitmap 920.
- the STA3 and STA4 may be instructed to perform the operation in the active mode through the power management bitmap 920.
- the AP may set to operate in a power save mode for STAs (eg, STA5 to STA8) that do not include data held through the power management bitmap 920.
- STAs eg, STA5 to STA8
- the power management bitmap 920 may be used for setting an operation mode of an STA indicated to include pending downlink data based on the TIM bitmap 900.
- the power management bitmap 920 is set to '1100' as 4 bits, and the power management bitmap 920 '1100' includes downlink data that is pending based on the TIM bitmap 900. It may correspond to each of the indicated STA1 to STA4.
- the STA may receive the TIM bitmap 900 and the power management bitmap 920 and set an operating state.
- the STA having the pending uplink data to be transmitted to the AP through the uplink may maintain the active mode and transmit the pending uplink data to the AP even when the STA is set to the power save mode.
- FIG. 10 is a conceptual diagram illustrating a method of setting an operation mode of an STA by an AP according to an embodiment of the present invention.
- FIG. 10 a method of setting an operation mode (TIM-based power save mode or active mode) of an STA by an AP is disclosed.
- a virtual TIM bitmap 1000 that receives video data based on real-time video streaming is defined.
- the AP may set an operation mode of an STA through a power management bitmap 1020 corresponding to the virtual TIM bitmap 1000.
- the virtual TIM bitmap 1000 may be a bitmap defined separately for an STA that receives data streamed in real time video.
- each of the bits of the virtual TIM bitmap 1000 may correspond to each of a plurality of STAs receiving a real-time video streaming service.
- an STA that receives a real time video streaming service may be expressed in terms of a real time streaming service STA.
- the virtual TIM bitmap 1000 may include information about presence or absence of pending downlink data for each of the real-time streaming service STAs.
- the power management bitmap 1020 may include information for setting an operation mode of each of the real-time streaming service STAs corresponding to the virtual TIM bitmap 1000.
- the virtual TIM bitmap 1000 may be '01110001'.
- the virtual TIM bitmap 1000 may indicate the presence of pending downlink data for each of the real-time streaming services STA2, STA3, STA4, and STA8.
- the power management bitmap 1020 may be '00110000'.
- the power management bitmap 1020 may instruct an operation of the real time streaming services STA3 and STA4 in a power save mode and may instruct an operation of the real time streaming services STA2 and STA8 in an active mode.
- the AP may generate a power management bitmap 1020 based on information on channel congestion between the real-time streaming service STA and the AP.
- the AP determines an operation mode of each of the real-time streaming service STAs having the downlink data and the real-time streaming service STAs having the downlink data pending based on information about the network state (eg, network congestion) between the APs. Can be set.
- the network state eg, network congestion
- FIG. 11 is a conceptual diagram illustrating a method of setting an operation mode of an STA according to an embodiment of the present invention.
- an STA receives a real-time video streaming service from an AP by setting an initial operation mode to a TIM-based power save mode, and the STA transitions from the TIM-based power save mode to an active mode by the AP.
- the STA may transmit an ADDTS request frame to the AP to set the initial operation mode to the TIM based power save mode (step S1100).
- the ADDTS request frame may include an APSD field set to 0 on the TSPEC information element, a scheduling field set to 0, and a power management field set to 1 included on the MAC header. Based on the setting of each field included in the ADDTS request frame as described above, the STA may request the TIM based power save mode to the AP as an initial operation mode.
- the AP may transmit an ADDTS response frame to the STA in response to the ADDTS request frame (step S1120).
- the STA that transmits the ADDTS request frame may obtain information on whether the STA permits the TIM based power save mode operation through the ADDTS response frame transmitted by the AP.
- the ADDTS response frame transmitted by the AP to allow TIM based power save mode operation includes an APSD field set to 0 on the TSPEC information element, a scheduling field set to 0, and a power management field set to 1 included on the MAC header. It may include.
- the STA may receive the ADDTS response frame and operate in a TIM based power save mode to receive a real-time video streaming service.
- the AP may receive WAN metric information based on ANQP while providing a real time video streaming service to the STA.
- the AP may determine whether the STA maintains the TIM-based power save mode by determining a network state (eg, network congestion) based on the received WAN metric information.
- a network state eg, network congestion
- the AP may determine to switch from the TIM based power save mode of the STA to the active mode. On the contrary, if it is possible to maintain the TIM based power save mode of the STA due to low network congestion, the AP may determine to maintain the TIM based power save mode of the STA.
- the AP may transmit, to the STA, information on switching to the active mode of the STA or maintaining the TIM based power save mode based on the power management bitmap (step S1140).
- the AP determines the transition from the TIM based power save mode of the STA to the active mode due to high network congestion.
- the AP may transmit a power management bitmap corresponding to the TIM bitmap or a power management bitmap corresponding to the virtual bitmap through the beacon frame.
- the power management bitmap may include bit information for switching from the power save mode of the STA to the active mode.
- the STA may switch from the TIM based power save mode to the active mode.
- the STA may receive a real time video streaming service from the AP in the active mode.
- FIG. 12 is a conceptual diagram illustrating a method of setting an operation mode of an STA according to an embodiment of the present invention.
- FIG. 12 a method in which a STA starts a TIM based power save mode to receive a real time video streaming service from an AP and transitions from the TIM based power save mode to an active mode by the AP is disclosed.
- FIG. 12 discloses a case in which an initial operation mode of the STA is performed based on a beacon frame transmitted by the AP.
- the STA may receive network state information from the AP (step S1200).
- the AP may receive WAN metric information based on the ANQP, and the STA may receive WAN metric information through a beacon frame transmitted by the AP.
- the STA may operate in a TIM-based power save mode to receive a real time streaming service.
- the STA may operate in an active mode to receive a real time streaming service.
- FIG. 12 a case where a STA receives a real-time video streaming service by setting an initial operation mode to a TIM based power save mode is disclosed.
- the STA may transmit the ADDTS request frame to the AP in order to receive the real-time video streaming service by setting the initial operation mode to the TIM based power save mode (step S1220).
- the ADDTS request frame may include an APSD field set to 0 on the TSPEC information element, a scheduling field set to 0, and a power management field set to 1 included on the MAC header. Based on the setting of the field included in the ADDTS request frame as described above, the STA may request the TIM based power save mode to the AP as an initial operation mode.
- the AP may transmit an ADDTS response frame to the STA in response to the ADDTS request frame (step S1240).
- the STA may transmit information on whether the STA permits the TIM based power save mode operation through the ADDTS response frame.
- the ADDTS response frame transmitted by the AP to allow TIM based power save mode operation includes an APSD field set to 0 on the TSPEC information element, a scheduling field set to 0, and a power management field set to 1 included on the MAC header. It may include.
- the STA may receive the ADDTS response frame and operate in a TIM based power save mode to receive a real-time video streaming service.
- the AP may receive WAN metric information based on ANQP while providing a real time video streaming service to the STA.
- the AP may determine whether the STA maintains the TIM-based power save mode by determining a network state (eg, network congestion) based on the received WAN metric information.
- a network state eg, network congestion
- the AP may determine the transition from the TIM based power save mode of the STA to the active mode. On the contrary, if it is possible to maintain the TIM based power save mode due to low network congestion, the AP may determine to maintain the TIM based power save mode of the STA.
- the AP may transmit information to the STA about switching to the active mode of the STA or maintaining the TIM based power save mode based on the power management bitmap.
- the AP determines the operation mode of the STA from the TIM based power save mode to the active mode due to high network congestion.
- the AP may transmit a power management bitmap corresponding to the TIM bitmap or a power management bitmap corresponding to the virtual bitmap through the beacon frame (step S1260).
- the power management bitmap may include bit information for switching from the power save mode of the STA to the active mode.
- the STA may switch from the TIM based power save mode to the active mode.
- the STA may receive a real time video streaming service from the AP based on the active mode.
- an STA receives WAN metric information through a beacon frame in order to receive a real time streaming service.
- the STA may receive the WAN metric information through the generic advertisement service (GAS) protocol instead of the beacon frame.
- GAS may be used to convey information about the external network to the STA.
- the GAS may be used for obtaining information about the STA's network service before association of the STA to the AP.
- the STA may transmit a GAS query frame to the AP and the AP may transmit a GAS response frame to the STA.
- the GAS response frame transmitted by the AP may include WAN metric information.
- FIG. 13 is a conceptual diagram illustrating a method of setting an operation mode of an STA according to an embodiment of the present invention.
- FIG. 13 a method of switching an STA from a active mode to a TIM-based power save mode while receiving a real-time streaming service is disclosed.
- the STA may receive network state information from the AP (step S1300).
- the AP may receive WAN metric information based on the ANQP, and the STA may receive WAN metric information through a beacon frame transmitted by the AP.
- the AP may receive WAN metric information based on ANQP while providing a real time streaming service to the STA.
- the AP may determine whether the STA can maintain the active mode by determining a network state (eg, network congestion) based on the received WAN metric information.
- a network state eg, network congestion
- the AP may determine to maintain the active mode of the STA. In contrast, when the network congestion is low, the AP may determine to switch from the active mode of the STA to the TIM based power save mode.
- the AP may transmit, to the STA, information on maintaining the active mode of the STA or switching to the TIM based power save mode based on the power management bitmap.
- the AP may transmit a power management bitmap corresponding to the TIM bitmap or a power management bitmap corresponding to the virtual bitmap through the beacon frame.
- the power management bitmap may include bit information for switching from the active mode of the STA to the power save mode.
- the STA may switch from the active mode to the power save mode.
- the STA may transmit the ADDTS request frame to the AP in order to receive the real-time video streaming service by setting the initial operation mode to the TIM based power save mode (step S1320).
- the ADDTS request frame may include an APSD field set to 0 on the TSPEC information element, a scheduling field set to 0, and a power management field set to 1 included on the MAC header. Based on the setting of the field included in the ADDTS request frame as described above, the STA may request the TIM based power save mode to the AP as an initial operation mode.
- the AP may transmit an ADDTS response frame to the STA in response to the ADDTS request frame (step S1340).
- the STA may transmit information on whether the STA permits the TIM based power save mode operation through the ADDTS response frame.
- the ADDTS response frame transmitted by the AP to allow TIM based power save mode operation includes an APSD field set to 0 on the TSPEC information element, a scheduling field set to 0, and a power management field set to 1 included on the MAC header. It may include.
- the STA may receive the ADDTS response frame and operate in a TIM based power save mode to receive a real-time video streaming service.
- the STA may receive a live streaming service from the AP in the power save mode.
- FIG. 14 is a conceptual diagram illustrating a frame for setting an operation mode of an STA according to an embodiment of the present invention.
- a separate frame may be defined instead of the ADDTS request frame and the ADDTS response frame for the TIM based power save mode.
- an operation mode request frame and an operation mode response frame which are available for an initial operation mode setting of the STA and a request for changing the operation mode are disclosed.
- FIG. 14 is a conceptual diagram illustrating an operation mode request frame.
- the operation mode request frame may include a request operation mode field 1400, a reception data category field 1410, and a reception condition field 1420.
- the request operation mode field 1400 may include information on a requesting operation mode.
- the requesting mode of operation may be a TIM based power save mode or an active mode.
- the value of the request operation mode field 1400 is 0, a TIM based power save mode is requested, and when the value of the request operation mode field 1400 is 1, an active mode may be requested.
- the request operation mode field 1400 may be used for requesting various operation modes of the STA as well as a TIM based power save mode and an active mode.
- the received data category field 1410 may include information on characteristics of data that the STA wants to receive. For example, the received data category field 1410 may include information on whether data that the STA intends to receive is real-time video streaming data or buffered video streaming data. Alternatively, the received data category field 1410 may include information about an access category of data received on the STA. An access category of data received on the STA may be classified into one of an access category (AC) _VO (voice), an AC_VI (video), an AC_BK (background), or an AC_BE (best effort).
- AC access category
- AC_VO voice
- AC_VI video
- AC_BK background
- AC_BE best effort
- the reception condition field 1420 may include information on a reception condition of data transmitted to the STA for an application executed in the STA.
- the reception condition field 1420 may include information about a threshold size of a reception delay, a threshold error rate of received data, or a critical channel state for normal operation of the application.
- FIG. 14 is a conceptual diagram illustrating an operation mode response frame.
- the operation mode response frame may include an operation mode setting field 1450, a transmission data category field 1460, and a transmission condition field 1470.
- the operation mode setting field 1450 may include information on whether to allow setting of a requested operation mode with respect to an operation mode request of the STA. When the operation mode of the requested STA is allowed based on the operation mode setting field 1450, the operation mode setting field 1450 is set to 1 and the operation mode of the requested STA based on the operation mode setting field 1450. If is not allowed, the operation mode setting field 1450 may be set to zero.
- the transmission data category field 1460 may include information on characteristics of data to be transmitted to the STA.
- the transmission data category field 1460 may include information on whether data to be transmitted by the AP is real-time video streaming data or buffered video streaming data.
- the transmission data category field 1460 may include information about an access category of data to be transmitted on the STA.
- An access category of data received on the STA may be classified into one of an access category (AC) _VO (voice), an AC_VI (video), an AC_BK (background), or an AC_BE (best effort).
- the transmission condition field 1470 may include information about a transmission condition of data transmitted to the STA.
- the transmission condition field 1470 may include information about an expected delay of the data to be transmitted, an expected error rate, or an expected channel state for data transmission.
- an operation mode of the STA may be set based on transmission and reception of the operation mode request frame and the operation mode response frame.
- 15 is a conceptual diagram illustrating a PPDU format for delivering a frame according to an embodiment of the present invention.
- the PPDU may include a PPDU header and a MAC protocol data unit (MPDU) (or a physical layer service data unit (PSDU)).
- MPDU MAC protocol data unit
- PSDU physical layer service data unit
- the frame may correspond to an MPDU.
- the PPDU header in the PPDU format may be used to mean a PHY header and a PHY preamble of the PPDU.
- the PPDU format disclosed in FIG. 15 delivers the aforementioned frames (eg, ADDTS request frame, ADDTS response frame, beacon frame, downlink frame for real-time video streaming service, operation mode request frame, operation mode response frame, etc.).
- aforementioned frames eg, ADDTS request frame, ADDTS response frame, beacon frame, downlink frame for real-time video streaming service, operation mode request frame, operation mode response frame, etc..
- the PPDU header of the downlink PPDU may include a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy-signal (L-SIG), and an HE-SIG A.
- L-STF legacy short training field
- L-LTF legacy long training field
- L-SIG legacy-signal
- HE-SIG A high efficiency-signal A
- HE-STF high efficiency-short training field
- HE-LTF high efficiency-long training field
- HE-SIG B high efficiency-signal-B
- the L-STF 1500 may include a short training orthogonal frequency division multiplexing symbol.
- the L-STF 1500 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.
- AGC automatic gain control
- the L-LTF 1510 may include a long training orthogonal frequency division multiplexing symbol.
- the L-LTF 1510 may be used for fine frequency / time synchronization and channel prediction.
- the L-SIG 1520 may be used to transmit control information.
- the L-SIG 1520 may include information about a data rate and a data length.
- the HE-SIG A 1530 may include identification information of a STA for indicating a target STA to receive a downlink PPDU.
- the STA may determine whether to receive the information included in the HE-SIG A 1530 based on the identifier information of the target STA.
- the STA may perform additional decoding on the downlink PPDU.
- the HE-SIG A 1530 may be configured to receive downlink data (frequency resources (or subbands) based on orthogonal frequency division multiplexing (OFDMA) or space time stream resources (MIMO (multiple input multiple output) based). Information may be included).
- OFDMA orthogonal frequency division multiplexing
- MIMO multiple input multiple output
- the HE-SIG A 1530 modulates MCS for color bit information, bandwidth information, tail bits, CRC bits, and HE-SIG B 1560 for BSS identification. and coding scheme), symbol number information for the HE-SIG B 1560, and cyclic prefix (CP) (or guard interval (GI)) length information.
- CP cyclic prefix
- GI guard interval
- the HE-SIG A 1530 may include information on a request operation mode of the STA, information on a characteristic of the request data of the STA, and information on a reception condition of the STA.
- the HE-SIG A 1530 may include information on an operation mode of an STA configured by the AP and information on characteristics of transmission data transmitted by the AP.
- the HE-STF 1540 may be used to improve automatic gain control estimation in a MIMO environment or an OFDMA environment.
- the HE-LTF 1550 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
- the HE-SIG B 1560 may include information about a length MCS (modulation and coding scheme) of a physical layer service data unit (PSDU) for each STA, and tail bits.
- MCS modulation and coding scheme
- PSDU physical layer service data unit
- the size of the inverse fast fourier transform (IFFT) applied to the fields after the HE-STF 1540 and the HE-STF 1540 and the size of the IFFT applied to the field before the HE-STF 1540 may be different.
- the size of the IFFT applied to the field after the HE-STF 1540 and the HE-STF 1540 may be four times larger than the size of the IFFT applied to the field before the HE-STF 1540.
- the STA may be determined whether to decode the field.
- the STA when the identifier information of the target STA included in the HE-SIG A 1530 indicates the identifier of the STA, the STA is based on the FFT size changed from the fields after the HE-STF 1540 and the HE-STF 1540. Decoding can be performed.
- the STA may stop decoding and configure a network allocation vector (NAV).
- NAV network allocation vector
- the cyclic prefix (CP) of the HE-STF 1540 may have a larger size than the CP of another field, and during this CP period, the STA may perform decoding on the downlink PPDU by changing the FFT size.
- the order of fields constituting the format of the PPDU disclosed at the top of FIG. 15 may vary.
- the HE-SIG B 1515 of the HE portion may be located immediately after the HE-SIG A 1505, as disclosed in the interruption of FIG. 15.
- the STA may decode up to the HE-SIG A 1505 and the HE-SIG B 1515, receive necessary control information, and set NAV.
- the size of the IFFT applied to the fields after the HE-STF 1525 and the HE-STF 1525 may be different from the size of the IFFT applied to the fields before the HE-STF 1525.
- the STA may receive the HE-SIG A 1505 and the HE-SIG B 1515. If reception of the downlink PPDU is indicated by the identifier of the target STA of the HE-SIG A 1505, the STA may perform decoding on the downlink PPDU by changing the FFT size from the HE-STF 1525. On the contrary, when the STA receives the HE-SIG A 1405 and is not instructed to receive the downlink PPDU based on the HE-SIG A 1505, the STA may configure the NAV.
- a downlink PPDU format for downlink (DL) multi-user (MU) transmission is disclosed.
- the downlink PPDU may be transmitted to the STA through different downlink transmission resources (frequency resources or spatial streams) based on OFDMA. That is, downlink data may be transmitted to a plurality of STAs through a plurality of subbands based on a downlink PPDU format for DL MU transmission.
- the AP may transmit downlink data to the plurality of STAs based on the DL MU downlink PPDU format.
- the previous field of the HE-SIG B 1545 on the downlink PPDU may be transmitted in a duplicated form in each of different downlink transmission resources.
- the HE-SIG B 1545 may be transmitted in encoded form on all transmission resources.
- the field after the HE-SIG B 1545 may include individual information for each of the plurality of STAs receiving the downlink PPDU.
- the CRC for each field may be included in the downlink PPDU.
- the CRC for each field may not be included in the downlink PPDU.
- the downlink PPDU format for DL MU transmission can reduce the CRC overhead of the downlink frame by using the HE-SIG B 1545 encoded in the entire transmission resource.
- the downlink PPDU format for DL MU transmission may be encoded based on an IFFT size different from the field before the HE-STF 1555 and the field after the HE-STF 1555. Accordingly, when the STA receives the HE-SIG A 1535 and the HE-SIG B 1545 and is instructed to receive the downlink PPDU based on the HE-SIG A 1535, the STA starts from the HE-STF 1555. Decoding of the downlink PPDU may be performed by changing the FFT size.
- 16 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
- the wireless device 1600 may be an STA capable of implementing the above-described embodiment and may be an AP 1600 or a non-AP STA (or STA) 1650.
- the AP 1600 includes a processor 1610, a memory 1620, and an RF unit 1630.
- the RF unit 1630 may be connected to the processor 1610 to transmit / receive a radio signal.
- the processor 1610 may implement the functions, processes, and / or methods proposed in the present invention.
- the processor 1610 may be implemented to perform the operation of the wireless device according to the embodiment of the present invention described above.
- the processor may perform an operation of the wireless device disclosed in the embodiment of FIGS. 1 to 15.
- the processor 1610 may obtain network state information and transmit operation mode setting information for setting an operation mode of the STA based on the network state information.
- the operation mode setting information may include a power management bitmap.
- the processor 1610 receives a request for setting the TIM based power save mode of the STA and determines whether to allow the setting request for the TIM based power save mode to include whether to permit the operation based on the TIM based power save mode. You can send a response frame.
- the STA 1650 includes a processor 1660, a memory 1670, and a radio frequency unit (RF) 1680.
- RF radio frequency unit
- the RF unit 1680 may be connected to the processor 1660 to transmit / receive a radio signal.
- the processor 1660 may implement the functions, processes, and / or methods proposed in the present invention.
- the processor 1660 may be implemented to perform the operation of the wireless device according to the embodiment of the present invention described above.
- the processor may perform the operation of the wireless device in the embodiment of FIGS. 1 to 15.
- the processor 1660 performs an initial setup procedure for setting the TIM-based power save mode with the AP, and operates in the TIM-based power save mode based on the initial setup procedure, based on the transmission period of the beacon frame. In the doze state, an awake state is switched to receive the first downlink frame from the AP.
- the processor 1660 may be configured to receive operation mode setting information indicating the transition from the TIM based power save mode to the active mode from the AP, and receive a second downlink frame from the AP based on the active mode.
- the first downlink frame and the second downlink frame may include data for a live video streaming service, and operation mode setting information may be generated based on network state information between the STA and the AP. .
- the operation mode setting information may be transmitted based on a power management bitmap on a beacon frame transmitted by the AP.
- Each of the plurality of bits included in the power management bitmap indicates whether an operation mode of each of the plurality of STAs including the STA coupled to the AP is set to a TIM-based power save mode or an active mode, and the power management bitmap
- Each of the plurality of bits included in the T1 bitmap corresponds to each of the plurality of bits included in the TIM bitmap, and the TIM bitmap may indicate whether or not there is pending downlink data for each of the plurality of STAs.
- Network status information is obtained by the AP based on ANQP, the network status information includes WAN metric information, the WAN metric information about the transmission rate of data transmitted over the channel between the AP and the STA and the load of the channel May contain information.
- Processors 1610 and 1660 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
- the memories 1620 and 1670 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
- the RF unit 1630 and 1680 may include one or more antennas for transmitting and / or receiving a wireless signal.
- Modules may be stored in memories 1620 and 1670 and executed by processors 1610 and 1660.
- the memories 1620 and 1670 may be inside or outside the processors 1610 and 1660, and may be connected to the processors 1610 and 1660 by various well-known means.
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Abstract
Description
Claims (10)
- 무선랜에서 파워 세이브 모드 기반의 동작 방법은,
STA(station)이 AP(access point)와 TIM(traffic indication map) 기반 파워 세이브 모드(power save mode)의 설정을 위한 초기 설정 절차를 수행하는 단계;
상기 TIM 기반 파워 세이브 모드로 동작하는 상기 STA이 비콘 프레임의 전송 주기를 기반으로 도즈 상태(doze state)와 어웨이크 상태(awake state) 사이의 전환을 수행하여 상기 AP로부터 제1 하향링크 프레임을 수신하는 단계;
상기 STA이 상기 AP로부터 상기 TIM 기반 파워 세이브 모드에서 액티브 모드(active mode)로의 전환을 지시하는 동작 모드 설정 정보를 수신하는 단계; 및
상기 동작 모드 설정 정보를 기반으로 상기 액티브 모드로 동작하는 상기 STA이 상기 전환 없이 상기 어웨이크 상태를 유지하여 상기 AP로부터 제2 하향링크 프레임을 수신하는 단계를 포함하되,
상기 제1 하향링크 프레임 및 상기 제2 하향링크 프레임은 실시간 비디오 스트리밍 서비스(live video streaming service)을 위한 데이터를 포함하고,
상기 동작 모드 설정 정보는 상기 STA과 상기 AP 사이의 네트워크 상태 정보를 기반으로 생성되는 방법. - 제1항에 있어서,
상기 동작 모드 설정 정보는 상기 AP에 의해 전송되는 비콘 프레임을 통해 전송되고,
상기 동작 모드 설정 정보는 파워 관리 비트맵(power management bitmap)을 기반으로 전송되고,
상기 파워 관리 비트맵에 포함되는 복수의 비트 각각은 상기 AP에 결합된 상기 STA을 포함하는 복수의 STA 각각의 동작 모드를 상기 TIM 기반 파워 세이브 모드로 설정할지 상기 액티브 모드로 설정할지 여부를 지시하고,
상기 파워 관리 비트맵에 포함되는 상기 복수의 비트 각각은 TIM 비트맵에 포함되는 복수의 비트 각각과 대응되고,
상기 TIM 비트맵은 상기 복수의 STA 각각에 대해 펜딩된 하향링크 데이터의 존재 여부를 지시하는 것을 특징으로 하는 방법. - 제2항에 있어서,
상기 네트워크 상태 정보는 상기 AP에 의해 ANQP(access network query protocol)를 기반으로 획득되고,
상기 네트워크 상태 정보는 WAN 메트릭(wide area network metric) 정보를 포함하고,
상기 WAN 메트릭 정보는 상기 AP와 상기 STA 사이의 채널을 통해 전송되는 데이터의 전송 속도 및 상기 채널의 부하에 대한 정보를 포함하는 것을 특징으로 하는 방법. - 제1항에 있어서,
상기 동작 모드 설정 정보는 상기 AP에 의해 전송되는 비콘 프레임을 통해 전송되고,
상기 동작 모드 설정 정보는 파워 관리 비트맵(power management bitmap)을 기반으로 전송되고,
상기 파워 관리 비트맵에 포함되는 복수의 비트 각각은 상기 AP에 결합된 상기 STA을 포함하는 복수의 STA 중 상기 실시간 비디오 스트리밍 서비스를 받는 상기 STA을 포함하는 적어도 하나의 STA 각각의 동작 모드를 상기 TIM 기반 파워 세이브 모드로 설정할지 상기 액티브 모드로 설정할지 여부를 지시하고,
상기 파워 관리 비트맵에 포함되는 상기 복수의 비트 각각은 가상 TIM 비트맵에 포함되는 복수의 비트 각각과 대응되고,
상기 가상 TIM 비트맵은 상기 실시간 비디오 스트리밍 서비스를 받는 상기 STA을 포함하는 상기 적어도 하나의 STA 각각에 대해 펜딩된 하향링크 데이터의 존재 여부를 지시하는 것을 특징으로 하는 방법. - 제4항에 있어서,
상기 네트워크 상태 정보는 상기 AP에 의해 ANQP(access network query protocol)를 기반으로 획득되고,
상기 네트워크 상태 정보는 WAN 메트릭(wide area network metric) 정보를 포함하고,
상기 WAN 메트릭 정보는 상기 AP와 상기 STA 사이의 채널을 통해 전송되는 데이터의 전송 속도 및 상기 채널의 부하에 대한 정보를 포함하는 것을 특징으로 하는 방법. - 무선랜에서 파워 세이브 모드를 기반으로 동작하는 STA(station)은,
무선 신호를 송신 또는 수신하기 위해 구현된 RF(radio frequency)부; 및
상기 RF부와 동작 가능하도록(operatively) 연결되는 프로세서를 포함하되,
상기 프로세서는 AP(access point)와 TIM(traffic indication map) 기반 파워 세이브 모드(power save mode)의 설정을 위한 초기 설정 절차를 수행하고,
상기 TIM 기반 파워 세이브 모드로의 동작 설정에 따라 비콘 프레임의 전송 주기를 기반으로 도즈 상태(doze state)와 어웨이크 상태(awake state) 사이의 전환을 수행하여 상기 AP로부터 제1 하향링크 프레임을 수신하고,
상기 AP로부터 상기 TIM 기반 파워 세이브 모드에서 액티브 모드(active mode)로의 전환을 지시하는 동작 모드 설정 정보를 수신하고,
상기 동작 모드 설정 정보를 기반으로 한 상기 액티브 모드로의 동작 설정에 따라 상기 전환 없이 상기 어웨이크 상태를 유지하여 상기 AP로부터 제2 하향링크 프레임을 수신하되,
상기 제1 하향링크 프레임 및 상기 제2 하향링크 프레임은 실시간 비디오 스트리밍 서비스(live video streaming service)을 위한 데이터를 포함하고,
상기 동작 모드 설정 정보는 상기 STA과 상기 AP 사이의 네트워크 상태 정보를 기반으로 생성되는 STA. - 제6항에 있어서,
상기 동작 모드 설정 정보는 상기 AP에 의해 전송되는 비콘 프레임을 통해 전송되고,
상기 동작 모드 설정 정보는 파워 관리 비트맵(power management bitmap)을 기반으로 전송되고,
상기 파워 관리 비트맵에 포함되는 복수의 비트 각각은 상기 AP에 결합된 상기 STA을 포함하는 복수의 STA 각각의 동작 모드를 상기 TIM 기반 파워 세이브 모드로 설정할지 상기 액티브 모드로 설정할지 여부를 지시하고,
상기 파워 관리 비트맵에 포함되는 상기 복수의 비트 각각은 TIM 비트맵에 포함되는 복수의 비트 각각과 대응되고,
상기 TIM 비트맵은 상기 복수의 STA 각각에 대해 펜딩된 하향링크 데이터의 존재 여부를 지시하는 것을 특징으로 하는 STA. - 제7항에 있어서,
상기 네트워크 상태 정보는 상기 AP에 의해 ANQP(access network query protocol)를 기반으로 획득되고,
상기 네트워크 상태 정보는 WAN 메트릭(wide area network metric) 정보를 포함하고,
상기 WAN 메트릭 정보는 상기 AP와 상기 STA 사이의 채널을 통해 전송되는 데이터의 전송 속도 및 상기 채널의 부하에 대한 정보를 포함하는 것을 특징으로 하는 STA. - 제6항에 있어서,
상기 동작 모드 설정 정보는 상기 AP에 의해 전송되는 비콘 프레임을 통해 전송되고,
상기 동작 모드 설정 정보는 파워 관리 비트맵(power management bitmap)을 기반으로 전송되고,
상기 파워 관리 비트맵에 포함되는 복수의 비트 각각은 상기 AP에 결합된 상기 STA을 포함하는 복수의 STA 중 상기 실시간 비디오 스트리밍 서비스를 받는 상기 STA을 포함하는 적어도 하나의 STA 각각의 동작 모드를 상기 TIM 기반 파워 세이브 모드로 설정할지 상기 액티브 모드로 설정할지 여부를 지시하고,
상기 파워 관리 비트맵에 포함되는 상기 복수의 비트 각각은 가상 TIM 비트맵에 포함되는 복수의 비트 각각과 대응되고,
상기 가상 TIM 비트맵은 상기 실시간 비디오 스트리밍 서비스를 받는 상기 STA을 포함하는 상기 적어도 하나의 STA 각각에 대해 펜딩된 하향링크 데이터의 존재 여부를 지시하는 것을 특징으로 하는 STA. - 제9항에 있어서,
상기 네트워크 상태 정보는 상기 AP에 의해 ANQP(access network query protocol)를 기반으로 획득되고,
상기 네트워크 상태 정보는 WAN 메트릭(wide area network metric) 정보를 포함하고,
상기 WAN 메트릭 정보는 상기 AP와 상기 STA 사이의 채널을 통해 전송되는 데이터의 전송 속도 및 상기 채널의 부하에 대한 정보를 포함하는 것을 특징으로 하는 STA.
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US15/309,415 US9974022B2 (en) | 2014-05-08 | 2015-04-03 | Method and apparatus for power saving mode-based operation in wireless LAN |
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KR20080033760A (ko) * | 2006-10-13 | 2008-04-17 | 엘지전자 주식회사 | 무선 네트워크에서 전력 제어 방법 |
KR20120041197A (ko) * | 2009-07-09 | 2012-04-30 | 엘지전자 주식회사 | 무선랜 시스템에서의 스테이션의 전력 관리 방법 및 이를 지원하는 스테이션 |
KR20140037892A (ko) * | 2011-05-31 | 2014-03-27 | 엘지전자 주식회사 | 파워 세이브 모드 운영을 지원하는 무선랜 시스템에서 ppdu 송신 및 수신 방법 및 이를 지원하는 장치 |
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WO2018001036A1 (zh) * | 2016-06-30 | 2018-01-04 | 华为技术有限公司 | 一种功率控制方法及装置 |
US10979973B2 (en) | 2016-06-30 | 2021-04-13 | Huawei Technologies Co., Ltd. | Power control method and apparatus |
WO2018012949A1 (ko) * | 2016-07-15 | 2018-01-18 | 삼성전자 주식회사 | 이동 통신 시스템의 단말의 상태 제어 방법 및 장치 |
US11304145B2 (en) | 2016-07-15 | 2022-04-12 | Samsung Electronics Co., Ltd. | Method and device for controlling state of terminal in mobile communication system |
CN111541592A (zh) * | 2019-02-07 | 2020-08-14 | 富士施乐株式会社 | 用于低功率广域网的系统和方法 |
CN111541592B (zh) * | 2019-02-07 | 2023-06-09 | 富士胶片商业创新有限公司 | 用于低功率广域网的系统和方法 |
Also Published As
Publication number | Publication date |
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US20170195959A1 (en) | 2017-07-06 |
KR20170003558A (ko) | 2017-01-09 |
JP2017519465A (ja) | 2017-07-13 |
JP6322766B2 (ja) | 2018-05-09 |
US9974022B2 (en) | 2018-05-15 |
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