WO2019092307A1 - Séquences de signature télé-réveil pour améliorer la consommation d'énergie de dispositifs sans fil - Google Patents

Séquences de signature télé-réveil pour améliorer la consommation d'énergie de dispositifs sans fil Download PDF

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Publication number
WO2019092307A1
WO2019092307A1 PCT/FI2018/050727 FI2018050727W WO2019092307A1 WO 2019092307 A1 WO2019092307 A1 WO 2019092307A1 FI 2018050727 W FI2018050727 W FI 2018050727W WO 2019092307 A1 WO2019092307 A1 WO 2019092307A1
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WIPO (PCT)
Prior art keywords
wireless device
identifier
radio interface
wireless
frame
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PCT/FI2018/050727
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English (en)
Inventor
Olli Alanen
Enrico-Henrik Rantala
Mika Kasslin
Janne Marin
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Nokia Technologies Oy
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Publication of WO2019092307A1 publication Critical patent/WO2019092307A1/fr

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Classifications

    • 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
    • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a power saving command
    • 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
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • 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]
    • 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

  • a communication system may be a facility that enables communication between two or more nodes or devices, such as fixed or mobile communication devices. Signals can be carried on wired or wireless carriers.
  • Wireless networks employ various power-saving features to reduce power consumption in battery-operated devices such as mobile devices.
  • Networks based on IEEE 802.11 (Wi-Fi) technology have introduced a power-save mode where a device may temporarily shut down its Wi-Fi interface to reduce the power consumption.
  • Other types of wireless networks may employ similar power-save modes that allow a battery-operated device to sleep or "doze" for periods of time, in order to conserve power.
  • a method includes receiving, by a wireless device in a wireless network via first radio interface, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with the wireless device;
  • an apparatus includes at least one processor and at least one memory including computer instructions, when executed by the at least one processor, cause the apparatus to: receive, by a wireless device in a wireless network via first radio interface, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with the wireless device; change a state of the wireless device to a sleep state in which the first radio interface of the wireless device is disabled and a second radio interface of the wireless device is enabled; determine, by the wireless device, that a frame is detected if the bit sequence is detected on a wireless channel while monitoring the wireless channel via the second radio interface; and decode, by the wireless device only if the frame is detected based on the bit sequence, a payload of the frame.
  • a computer program product includes a computer-readable storage medium and storing executable code that, when executed by at least one data processing apparatus, is configured to cause the at least one data processing apparatus to perform a method including: receiving, by a wireless device in a wireless network via first radio interface, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with the wireless device; changing a state of the wireless device to a sleep state in which the first radio interface of the wireless device is disabled and a second radio interface of the wireless device is enabled; determining, by the wireless device, that a frame is detected if the bit sequence is detected on a wireless channel while monitoring the wireless channel via the second radio interface; and decoding, by the wireless device only if the frame is detected based on the bit sequence, a payload of the frame.
  • a method includes transmitting, by access node in a wireless network, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with a first wireless device; transmitting, by the access node, a wake-up frame including a preamble and a payload; wherein a presence of the bit sequence within the preamble of the wake-up frame triggers the first wireless device to decode the payload of the wake-up frame; and wherein the payload of the wake-up frame comprises a second identifier associated with the wireless device.
  • an apparatus includes at least one processor and at least one memory including computer instructions, when executed by the at least one processor, cause the apparatus to: transmit, by access node in a wireless network, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with a first wireless device; transmit, by the access node, a wake-up frame including a preamble and a payload; wherein a presence of the bit sequence within the preamble of the wake-up frame triggers the first wireless device to decode the payload of the wake-up frame; and wherein the payload of the wake-up frame comprises a second identifier associated with the wireless device.
  • a computer program product includes a computer-readable storage medium and storing executable code that, when executed by at least one data processing apparatus, is configured to cause the at least one data processing apparatus to perform a method including: transmitting, by access node in a wireless network, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with a first wireless device; transmitting, by the access node, a wake-up frame including a preamble and a payload; wherein a presence of the bit sequence within the preamble of the wake-up frame triggers the first wireless device to decode the payload of the wake-up frame; and wherein the payload of the wake-up frame comprises a second identifier associated with the wireless device.
  • FIG. 1 is a block diagram of a wireless network according to an example implementation.
  • FIG. 2 is a diagram illustrating a wireless device according to an example implementation.
  • FIG. 3 is a diagram illustrating a wake-up radio frame according to an example implementation.
  • FIG. 4 is a diagram illustrating a frame detection circuit according to an example implementation.
  • FIG. 5 A is a diagram illustrating a wake-up radio (WUR) signature sequence information element according to an example implementation.
  • WUR wake-up radio
  • FIG. 5B is a diagram illustrating a wake-up radio (WUR) signature sequence information element according to an example implementation.
  • WUR wake-up radio
  • FIG. 6 is a diagram illustrating operation of a system according to an example implementation.
  • FIG.7 is a flow chart illustrating operation of a wireless device according to an example implementation.
  • FIG. 8 is a flow chart illustrating operation of an access node according to an example implementation.
  • FIG.9 is a block diagram of a node or wireless station (e.g., base station/access point or mobile station/wireless device) according to an example
  • FIG. 1 is a block diagram of a wireless network 130 according to an example implementation.
  • wireless devices 131, 132, 133 and/or 135 may be connected (and in communication) with an access node 134, which may also be referred to, for example, as a base station (BS), an access point (AP), an enhanced Node B (eNB), a gNB, or a network node.
  • a wireless device e.g., each of wireless devices 131, 132, 133, 135) may also be referred to as a station (STA), mobile station (MS), terminal, user terminal, user device or user equipment (UE), or other wireless device.
  • STA station
  • MS mobile station
  • UE user equipment
  • a wireless device may include, e.g., a handheld wireless device, a mobile phone, a cell phone, a smartphone, a personal digital assistant (PDA), a handset, a laptop and/or touch screen computer, a tablet, a phablet, a game console, a notebook, a multimedia device, or other wireless device, or other device that may include a wireless radio, wireless receiver, and/or wireless transmitter/receiver (wireless transceiver), as examples.
  • PDA personal digital assistant
  • a basic service set is a basic building block of an IEEE 802.11- based wireless local area network (WLAN).
  • the most common BSS type is an IEEE 802.11- based wireless local area network (WLAN).
  • the infrastructure BSS that includes a single AP together with all STAs (or wireless devices) associated with the AP.
  • the AP may be a fixed AP or it may be a mobile AP.
  • the access node (e.g., AP) 134 may also provide access to other networks, e.g., the Internet.
  • a number of interconnected BSSs may form an extended service set (ESS).
  • ESS extended service set
  • a wireless device 132 may establish and manage a peer-to-peer wireless network to which one or more other wireless devices, e.g., 131, 133, 135, may associate.
  • the access node 134 may be connected to a network management system (NMS) 150 which may include an apparatus configured to maintain channel usage information of wireless networks of one or more access nodes and to configure the channel usage of the wireless networks. For example, it may arrange wireless networks located close to each other to operate on different channels and, thus, avoid interference between the networks.
  • NMS network management system
  • An example scenario is that access nodes of an enterprise are all controlled by the same NMS 150.
  • the network management system 150 is comprised in one of the access nodes, e.g. in the access node 134.
  • the network management system 150 is realized by an apparatus different from the access nodes, e.g. by a server computer to which the access nodes may connect via a wired or wireless connection.
  • New Radio development may support a number of different applications or a number of different data service types, such as for example: machine type communications (MTC), enhanced machine type communication (eMTC), Internet of Things (IoT), and/or narrowband IoT wireless devices, enhanced mobile broadband (eMBB), wireless relaying including self- backhauling, D2D (device-to-device) communications, and ultra-reliable and low-latency communications (URLLC).
  • MTC machine type communications
  • eMTC enhanced machine type communication
  • IoT Internet of Things
  • eMBB enhanced mobile broadband
  • wireless relaying including self- backhauling
  • URLLC ultra-reliable and low-latency communications
  • wireless radio interfaces e.g., including a wireless receiver and/or transceiver
  • wireless technologies e.g., such as a wireless device that may include both a Wi-Fi radio interface and a NR/5G radio interface, for example.
  • a wireless network may include a single BSS or a plurality of BSSs.
  • the wireless network may include a plurality of BSSs that have the same service set identifier (SSID) the same roaming identifier, and/or the same roaming partnership.
  • SSID service set identifier
  • a wireless device 132 may establish a connection with any one of access nodes it has detected to provide a wireless connection within the neighbourhood of the wireless device, such as with access node 134.
  • the connection establishment may include authentication in which an identity of the wireless device 132 is established in the access node 134.
  • the authentication may include exchanging an encryption key used in the BSS.
  • the access node 134 and the wireless device 132 may carry out association in which the terminal device is fully registered in the BSS, e.g., by the access node 134 providing the wireless device 132 with an association identifier (AID).
  • AID association identifier
  • association of the wireless device to an access node should be understood broadly as establishing a connection between the wireless device 132 and the access node 134 such that the wireless device 12 is in a connected state with respect to the access node 134 and waiting for downlink frame transmissions from the access node 134 and its own buffers for uplink frame transmissions.
  • the wireless devices e.g., 131,
  • IEEE 802.1 lai task group defines principles for fast initial link setup (FILS). Some principles may relate to passive scanning in which a scanning device, e.g., a wireless device or STA, passively scans channels for any beacon, management, or advertisement frames. Other principles may relate to active scanning in which the scanning device actively transmits a scanning request message, e.g., a probe request message or a generic advertisement service (GAS) request, in order to query for present APs or networks. The probe request may also set some conditions that a responding device should fulfil in order to respond to the probe request. In some embodiments, the scanning device may be called a requesting device or a requesting apparatus. Responding devices may transmit scanning response messages, e.g., probe response messages, in response to the scanning request message, wherein the scanning response message may contain information on the responding device, its network, and other networks.
  • FILS fast initial link setup
  • Power consumption is often an issue with wireless networks and mobile communication.
  • power-save mechanisms like a power save (PS) mode may be used to save power when the wireless device or STA is associated to an access node.
  • PS power save
  • an associated STA may remain in active mode which enforces it to stay in an awake state in which the wireless device or STA is fully powered and able to transmit and receive frames with the access node.
  • An associated wireless device or STA may transition to the PS mode with explicit signalling and, while operating in the PS mode, it may save power by operating occasionally in a doze (or sleep) state.
  • the STA In the doze state, the STA is not able to transmit or receive frames but, on the other hand, power consumption of the STA is on a considerably lower level than in the awake state.
  • the STA may wake up from the doze state to receive e.g. periodic beacon frames from the access node. While the STA is in the doze state, the access node buffers frames addressed to the STA. The access node transmits buffered multicast/groupcast frames after specific delivery traffic indication map (DTIM) beacon frames. Unicast frames may be transmitted only upon the STA in the PS mode has indicated that it has entered into the awake state.
  • the access node may indicate in the beacon frames (in a traffic indication map, TIM, field) whether it has frames buffered for the STA.
  • DTIM delivery traffic indication map
  • the wireless device or STA There are two main mechanisms for the wireless device or STA in the PS mode to indicate transition to the awake state and to retrieve buffered frames from the access node.
  • the mechanisms are use of PS-Poll frames and use of automatic power save delivery (APSD) and, specifically, unscheduled APSD (U-APSD).
  • APSD automatic power save delivery
  • U-APSD unscheduled APSD
  • the wireless device or STA transmits a PS-Poll frame to indicate to the access node that the wireless device or STA shall be in the awake state until it has received one downlink frame.
  • the access node assumes that the STA is back in the doze state and continues buffering frames to the STA.
  • the STA may retrieve multiple frames buffered in the access node by triggering a service period (SP) with an uplink trigger frame transmitted to the access node.
  • SP service period
  • the STA Upon transmitting the trigger frame, the STA remains in the awake state until it has received from the access node a frame indicating an end of the service period (EOSP).
  • EOSP may be indicated by setting an EOSP bit set to a determined value in the frame.
  • a wireless device or STA may include two radio interfaces, including: 1) a primary connectivity (or main) radio interface that may be enabled (or turned on) in an awake state of the wireless device for general communication (e.g., transmitting and receiving) of data and signals to/from an access node or AP, and possibly disabled (or turned off) during a sleep state of the wireless device; and 2) a wake-up radio interface, which may be a special low power radio interface that may be enabled (or turned on) during a sleep state of the wireless device, and which may be disabled or turned off during the awake state of the wireless device, for example.
  • the wake-up radio interface is enabled also during the awake state.
  • the wake-up radio interface may enable further power-savings by allowing the main radio (also known as a primary connectivity radio) interface used for data communication according to 802.11 technology to doze or be disabled (to be placed in a sleep state or be turned off) for longer periods.
  • the low-power radio interface may be referred to as a wake-up radio (WUR) receiver or a low-power WUR (LP-WUR) receiver (or WUR interface), and may be considered to be (or used as) a companion radio to the primary connectivity radio (or main/primary connectivity radio interface).
  • a wireless device such as wireless device 132 or STA may comprise both a WUR interface and a main (or primary connectivity) 802.11 interface.
  • An access node may comprise a wake-up transmitter and the main 802.11 interface. Accordingly, a device of the wireless network may include a wake-up radio interface and the main interface.
  • a purpose of the wake-up radio interface is only or mainly to wake-up the main radio interface when the access node has data to transmit to a dozing (e.g., disabled, sleeping or turned off) wireless device or STA.
  • a dozing e.g., disabled, sleeping or turned off
  • a wireless device or STA may receive a wake-up radio (WUR) frame while in power saving mode, and then may transition from a sleep state to an awake state within the PS mode, in response to receiving the WUR frame.
  • a wireless device or STA may transition from a PS mode to awake mode, in response to receiving the WUR frame.
  • WUR wake-up radio
  • the wake-up radio interface may be designed such that it consumes less power than the main radio interface.
  • the wake-up radio interface may employ a simpler modulation scheme than the main radio interface, e.g., the wake-up radio interface may, for example, use only on-off keying while the main radio interface uses variable modulation schemes such as phase-shift keying and (quadrature) amplitude modulation, etc.
  • the wake-up radio interface may operate on a smaller bandwidth than the smallest operational bandwidth of the main radio interface, e.g. 5 Megahertz (MHz) for the wake-up radio and 20 MHz for the smallest bandwidth of the main radio interface, for example.
  • FIG. 2 is a diagram illustrating a wireless device 132 according to an example implementation.
  • wireless device 132 may include a number of blocks or components, including a processor 230 and memory 240.
  • Wireless device 132 may also include a main radio interface 210 for general communications, e.g., including for transmitting data and signals to and receiving data and signals from an access node (or AP)134 or other network node.
  • Wireless device 132 may also include a wake-up radio (WUR) interface 220 which may be a low power radio interface that may be used to wake-up (cause the main radio interface to transition from being disabled to being enabled) the main radio interface 210.
  • WUR wake-up radio
  • the main radio interface 210 may include a wireless transmitter and receiver (e.g., wireless transceiver), whereas the WUR interface 220 may include at least a wireless receiver (and thus may omit a wireless transmitter, for example).
  • the WUR interface 220 may include both a wireless transmitter and receiver (e.g., wireless transceiver). According to an example
  • a radio interface may, at least in some cases, include a PHY entity and a MAC entity.
  • the radio interface may, at least in some cases, monitor a channel by searching for a known sequence to detect the start of a frame, which may be referred to as frame detection.
  • the radio interface may also perform time and frequency synchronization and automatic gain control, and other processing, based on a preamble of a received frame.
  • a radio interface may perform many functions, including, for example, receiving and decoding a at least a portion of a payload of a received frame, for example.
  • a radio interface may perform other functions. This is merely an illustrative example, and other configurations may be used.
  • wireless device 132 may transition between two states, including: 1) an awake state 250 in which the main radio interface 210 is enabled (or on) and the wake-up radio interface 220 is typically disabled (or off or not operating); 2) a sleep state 260 in which the main radio interface 210 is disabled (or off or not operating) and the wake-up radio interface 220 is enabled (or on).
  • the WUR interface 220 may be enabled during the awake state 250 as well. As shown in FIG.
  • a wireless device 132 may transition from awake state 250 to sleep state 260 (e.g., by disabling main radio interface 210 and enabling WUR interface 220) in response to the wireless device 132 receiving a frame indicating an end of the service period (EOSP), or other control signal or event, for example.
  • EOSP end of the service period
  • wireless device 132 may transition from sleep state 260 to awake state 250 (e.g., by enabling main radio interface 210 and disabling WUR interface 220) in response to the wireless device 132 receiving a wakeup radio frame (which may also be referred to as a wake-up frame).
  • a wakeup radio frame which may also be referred to as a wake-up frame.
  • a main purpose of the wake-up radio interface 220 is to wake up the main radio interface 210 (e.g., cause wireless device 132 to enable main radio interface 210).
  • the main radio interface 210 in a sleep state of the wireless device 132, the main radio interface 210 may be disabled or powered off (e.g., in order to conserve power), and the wake-up radio (WUR) interface 220 may be enabled or powered on.
  • a wake-up radio interface 220 of the wireless device (or STA) 132 may be configured to receive and extract wake-up radio frames transmitted by a wake-up radio interface of the access node.
  • the wake-up radio interface 220 may be capable of decoding the wake-up radio frames (also known as wake-up frames) on its own without any help from the main radio interface 210.
  • the wake-up radio (WUR) interface 220 may comprise, in addition to a radio frequency front-end receiver components, digital baseband receiver components and a frame extraction processor capable of decoding contents of a wake-up radio frame.
  • the wake-up radio frame may comprise a payload that may include an identifier such as destination address field indicating (or associated with) a wireless device 132 that should wake up the main radio interface 210, and the frame extraction processor may perform decoding of the payload including the destination address from a received wake-up radio frame and determine whether or not the destination address is an address of the wireless device (or STA) 132 of the frame extraction processor. If yes, the wake-up radio (WUR) interface 220 and/or wireless device 132 may output a wake-up signal causing the main radio interface 210 to wake up for radio communication with an access node (or AP).
  • a WUR interface of a wireless device may receive and decode each received wake-up radio frame that is transmitted within a wireless network. If there are many wireless devices (or STAs), then this may cause a WUR interface to receive and decode many wake-up radio frames, which may cause each wireless device to consume significant power. Therefore, according to an example implementation, example techniques are described that may reduce the power consumption of a wake-up radio interface 220 and/or wireless device. For example, a preamble of a wake-up radio frame may be provided that includes an identifier, such as a wake-up signature sequence, that is associated with a wireless device.
  • a wake-up radio interface 220 may decode a payload of a wake-up radio frame (e.g., including decoding an identifier or address of a wireless device provided within the payload) if (e.g., only if) WUR interface 220 performs frame detection based on the wake-up signature sequence.
  • FIG. 3 is a diagram illustrating a wake-up radio frame according to an example implementation.
  • Wake-up radio frame 300 may include a preamble 310 and a payload 312.
  • Preamble 310 may comprise one or more sequences which may be use to detect a start of a frame.
  • Preamble 310 may comprise also one or more other fields which are used for other purposes.
  • preamble 310 may include an automatic gain control (AGC) and synchronization sequence (AGC/Sync Seq.) 314 that may be used by the wireless device 132 and/or WUR interface 220 to perform time and frequency synchronization and gain control.
  • the AGC/Sync. sequence 314 may include multiple (e.g., 10) identical short training symbols, multiple (e.g., 2) identical long training symbols, and a guard interval, which may be used by wake-up radio interface 220 for synchronization and automatic gain control.
  • the preamble 310 of wake-up radio frame 300 may also include a wakeVup radio signature sequence 316 that may be associated with one or more wireless devices.
  • Wake-up radio signature sequence 316 may include a bit sequence (e.g., a set of bit(s) or a set of symbol(s)) that may be associated with one or more wireless devices.
  • each (or one or more) wake-up radio signature sequence may be associated with only one wireless device (or STA), or each (or one or more) wake-up radio signature sequence may be associate with a plurality of wireless devices.
  • each wake-up radio signature sequence may be associated with an access node or AP.
  • a wake-up radio signature sequence 1 may be associated with access node 1
  • a wake-up radio signature sequence 2 may be associated with access node 2.
  • access node 1 may transmit a wake-up frame that includes wake-up radio signature sequence 1
  • access node 2 may transmit a wake-up frame that includes wake-up radio signature sequence 2, etc.
  • each wireless device that is connected to an access node may perform frame detection (e.g., detect presence or a start of a wake-up radio frame) based on a wake-up radio signature sequence that is associated with or assigned to its associated (or connected) access node or AP, for example.
  • access nodes may be assigned at least partially different sets of one or more wake-up radio signature sequences.
  • access node 1 may be assigned a first set of wake-up radio signature sequences, comprising e.g. the wake-up radio signature sequence 1 and a wake-up radio signature sequence 3.
  • Access node 2 may be assigned a second set of wake-up radio signature sequences, comprising e.g. the wake- up radio signature sequence 2 and wake-up radio signature sequence 4.
  • at least one of wake-up radio signature sequences may be common in the first set and in the second set.
  • each different wake-up radio signature sequence may be associated with (or mapped to): a wake-up radio receiver identifier (or identifiers) that identifies the wake-up radio receiver/interface 220 of a wireless device (or devices), a device identifier (or identifiers) that identifies the wireless device (or devices), an address (or addresses) (e.g., MAC address or other address) of the wireless device (or devices), an association identifier for (or that has been assigned to) the wireless device (or wireless devices), and/or other identifier that may be associated with a wireless device(s).
  • the wake-up radio signature sequence 316 may be associated with a subset of wireless devices/stations associated with the access node 134.
  • a first wake-up radio signature sequence may be associated with wireless devices 131 and 132 of Fig. 1; a second wake-up radio signature sequence may be associated with wireless device 133; and, a third wake-up radio signature sequence may be associated with wireless devices 135, by way of illustrative example.
  • Payload 312 of wake-up radio frame 300 may include one or more fields, including for example, at least an identifier 318 associated with wireless device 132, e.g., such as an address of the wireless device to which the wake-up radio frame is directed or addressed.
  • the identifier 318, associated with the wireless device 132 and provided within the WUR frame payload 312 may be (or may include), for example: a wake-up radio receiver identifier that identifies the wake-up radio
  • wireless device 132 receives and transmits a packet identifier that identifies the wireless device 132, an address (e.g., MAC address or other address) of the wireless device 132, an association identifier for (or that has been assigned to) the wireless device 132, and/or other identifier that may identifier or may be associated with the wireless device 132.
  • a device identifier that identifies the wireless device 132
  • an address e.g., MAC address or other address
  • association identifier for (or that has been assigned to) the wireless device 132
  • other identifier that may identifier or may be associated with the wireless device 132.
  • a wake-up radio interface 220 of wireless device 132 to first detect a presence on a monitored wireless channel or signal of a wake-up radio signature sequence 316 that is associated with wireless device 132 before the wake-up radio interface 220 decodes possible other fields of the preamble and a payload 312 (including decoding the identifier or address 318).
  • the wake-up radio interface 220 first detecting a wake-up radio signature sequence 316 that is mapped to the wireless device 132 (or mapped to an identifier that is associated with the wireless device 132) before decoding a payload 312 of a wake-up radio frame 300, this may decrease the amount of processing performed by a wake-up radio interface 220 (at least in for wake-up radio frames addressed or directed to other wireless devices), thereby improving (decreasing) power consumption at the wireless device 132.
  • Table 1 Mapping of WUR signature sequences to different wireless devices/device IDs or receivers/receiver IDs.
  • Table 1 is an illustrative example of how each WUR signature sequence may be mapped to or associated with a set of one or more wireless devices. For example, WUR signature sequence 1 is mapped to (or associated with) device 1 ; WUR signature sequence 2 is mapped to (or associated with) device 2; WUR signature sequence 3 is mapped to (or associated with) devices 1 and 2; And, WUR signature sequence 4 is mapped to (or associated with) all devices within the network (e.g., all WUR
  • a wireless device may be associated with one or multiple WUR signature sequences. Also, for example, if there are more wireless devices than the number of available WUR signature sequences, then multiple wireless devices (or multiple WUR receivers/interfaces) may be mapped to each (or one or more) of the WUR sequence signatures. This may allow only 1, or only a subset, of the wireless devices to decode a payload of a WUR frame in response to each WUR frame. This may provide significant power savings across a network, as it may require only the
  • the device ID or WUR receiver ID indicated in Table 1 may be, e.g., either a unicast (or single entity) identifier that identifies a single wireless device or receiver, a multicast (or group) identifier that identifies a plurality of wireless devices or receivers, and a broadcast or wildcard identifier that identifies all wireless devices or all receivers within a network.
  • FIG. 4 is a diagram illustrating a frame detection circuit according to an example implementation.
  • Frame detection may include detecting an occurrence and/or starting edge of a frame.
  • a PHY entity of WUR interface 220 may include a frame detection circuit 400, including a correlator 410 and a comparator 420.
  • Frame detection circuit 400 may be used to detect an occurrence or a start of a WUR frame 300, for example.
  • frame detection circuit 400 may perform correlation based at least on a WUR signature sequence 316A that is associated with (or mapped to) wireless device 132 (or mapped to an identifier that is associated with wireless device 132).
  • correlator 410 may correlate: 1) a signal Y that is obtained by monitoring or sensing a wireless channel via WUR interface 220, and 2) at least a WUR signature sequence 316A that is mapped to or associated with a set of one or more wireless devices including wireless device 132.
  • correlator 410 may correlate: 1) a signal Y that is obtained by monitoring or sensing a wireless channel via WUR interface 220, and 2) a known preamble 310A that is mapped to or associated with the wireless device 132.
  • the known preamble 31 OA may include, for example, a general AGC/synchronization sequence 314, and a WUR signature sequence 316A that is mapped to or associated with a set of one or more wireless devices including wireless device 132.
  • a correlation result (R) output by correlator 410 is compared by comparator 420 to a threshold 430. If the correlation result (R) is greater than or equal to threshold 430, then at 440, this indicates that frame detection has been performed (a WUR frame has been detected that is directed (or addressed) to a set of one or more wireless devices including the wireless device 132), and at 450, the WUR interface 220 will then decode the corresponding WUR frame payload 312 (of a WUR frame that includes the received bit(s) via monitored wireless channel used for correlation).
  • WUR interface 220 may then wake the main radio interface 210 if (e.g., only if) the payload 312 includes an identifier (e.g., address or association identifier/ID, or other identifier) associated with the wireless device 132.
  • an identifier e.g., address or association identifier/ID, or other identifier
  • a correlation result that is less than threshold 430 may indicate either, for example, that no WUR frame is detected (e.g., based on failure to correlate against AGC/Sync. seq. 314), or that the signal (Y) monitored for a WUR frame did not include the correct WUR signature sequence 316A that matched the WUR signature sequence associated or mapped to wireless device 132.
  • signals (Y) are obtained for a monitored wireless channel that include a WUR frame that is directed to a different wireless device or a different set of wireless devices, then the WUR signature sequence of the obtained signal will not cause a correlation result to be greater than or equal to threshold 430, and the WUR interface 220 of wireless device 132 will not decode the payload 312 of the corresponding WUR frame.
  • correlation may be considered a relatively low power operation that may be performed by a PHY of WUR interface 220, for example, whereas decoding a frame payload may, at least in some cases, require more power or significant power consumption by WUR interface 220 and/or wireless device 132.
  • power consumption for the wireless device 132 may be improved (decreased) by having the WUR interface 220 and/or wireless device 132 avoid (or omit) decoding a WUR frame payload 312 for WUR frame 300 that are not directed to wireless device 132.
  • frame detection based at least on the WUR signature sequence(s) mapped to wireless device 132, may be used to determine whether or not the WUR interface 220 will decode the corresponding WUR frame payload 312.
  • FIG. 5A is a diagram illustrating a wake-up radio (WUR) signature sequence information element 510 according to an example implementation that may be used by an access node to indicate a mapping between a WUR signature sequence and one or more identifiers (e.g., WUR receiver identifiers or wireless device identifiers).
  • WUR wake-up radio
  • an access node 134 may transmit (and wireless device 132 may receive via main radio interface 210) the WUR signature sequence information element (IE) 510, e.g., indicating, for each WUR signature sequence, one or more wireless devices or WUR receivers to which each of one or more WUR signature sequences are mapped to or associated with.
  • IE WUR signature sequence information element
  • each wireless device may determine for which WUR signature sequences the WUR interface or wireless device is mapped to or associated with, and thus, indicating for which WUR signature sequences the wireless device or WUR interface 220 should perform correlation to detect a WUR frame based on the indicated WUR signature sequence.
  • WUR wake-up radio
  • the IE 510 may include a length field indicating a length of the information element, a WUR signature sequence index 1 that identifies a first WUR signature sequence, a wake-up radio receiver ID 1 (WURx ID1) that is associated with WUR signature sequence index 1, a WUR signature sequence index 2 that identifies a second WUR signature sequence, and a wake-up receiver ID 2 (WURx ID2) that is associated with WUR signature sequence index 2, etc.
  • WURx ID1 wake-up radio receiver ID 1
  • WURx ID2 wake-up radio receiver ID 2
  • WURx ID2 wake-up receiver ID 2
  • FIG. 5B is a diagram illustrating a wake-up radio (WUR) signature sequence information element 512 according to another example implementation.
  • WUR wake-up radio
  • an additional field may be provided for each WUR signature sequence to indicate a number (quantity) of WUR IDs/device IDs that are listed for a given WUR signature sequence, such as fields 516, 518.
  • the WUR signature sequence IE 512 include a WUR signature sequence index 1, a field 516 that indicates a number of WURx IDs that are associated with WUR signature sequence index 1.
  • field 516 may indicate a value nl, and then nl wake-up receiver IDs are indicated: WURx ID 1 , WURx ID 2, ...WURx ID nl .
  • a field 518 indicates a number of WURx IDs that are associated with WUR signature sequence index 2.
  • field 518 may indicate a value n2, and then n2 wake-up receiver IDs may be indicated: WURx ID x, WURx ID x+1,...WURx ID x+n2.
  • the WUR signature sequence information element (IE) 510 may be sent by an access node 134 to one or more wireless devices via an association response, a re-association response, a beacon, a probe response, a dedicated message sent for the purpose of communicating IE 510, or other message.
  • FIG. 6 is a diagram illustrating operation of a system according to an example implementation.
  • a wireless device may become associated with an access node 134.
  • wireless device receives, via main radio interface 220, a wake-up radio (WUR) signature sequence information 510 or 512 with a mapping between WURx ID1 (e.g., identifying the WUR interface 220 of wireless device 132, or identifying wireless device 132) or other identifier associated with or identifying wireless device 132 and an indication of a WUR signature sequence 1 (e.g., WUR sig. seq. index 1).
  • the WUR signature sequence information 510 or 512 may comprise also mapping between WURx ID2 and the WUR signature sequence 1. Or in general, a subset of wireless devices of a BSS may be mapped to the WUR signature sequence 1.
  • the wireless device changes or transitions to sleep state 260, in which main radio interface 210 is disabled and
  • WUR interface 220 is enabled; and wireless device 132 signals this change in state to access node 134.
  • the access node 134 receives data that is addressed to wireless node 132.
  • access node transmits a wake-up radio (WUR) frame 300, with a WUR sig. seq. 1 in the preamble 310 of the WUR frame 300, in order to wake up main radio interface 210 of wireless device 132.
  • WUR wake-up radio
  • WUR interface 220 monitors or senses a wireless channel, and detects the WUR signature sequence 1 (that is mapped to wireless device 132) within a preamble.
  • WUR interface 220 may perform correlation of a known bit sequence that may include at least the WUR sig. seq. 1 and a signal obtained by monitoring a wireless channel. Based on the correlation, for example, the WUR interface may perform frame detection (e.g., detect presence or start of a WUR frame directed to wireless device 132, due to WUR sig. seq. 1 within a preamble 310 of the detected WUR frame) based at least on the known bit sequence, e.g., including at least the WUR signature sequence 1 that has been mapped to wireless device 132, for example.
  • frame detection e.g., detect presence or start of a WUR frame directed to wireless device 132, due to WUR sig. seq. 1 within a preamble 310 of the detected WUR frame
  • the known bit sequence may also include other bits or information, such as an AGC/synchronization sequence 314 (FIG. 3), where the bit sequence would include both the AGC/synchronization sequence 314 and WUR signature sequence 316.
  • the WUR frame is detected by the WUR interface 220 only if the WUR interface 220 detects a bit sequence comprising both the AGC/synchronization sequence 314 and WUR signature sequence 316 of FIG. 3, according to an illustrative example.
  • one example technique that may be used to perform frame detection may include using a correlator 410 to correlate the known bit sequence with a signal obtained by monitoring a wireless channel (e.g., see FIG. 4 for an illustrative example).
  • the WUR interface 220 decodes the payload 312 to detect an identifier/address 318, and determines that the identifier/address 318 within the payload 312 is associated with wireless device 132 (e.g., address of wireless device 132, association ID assigned to wireless device 132, or other identifier).
  • the wireless device 132 and/or WUR interface 220 wakes up main radio interface (e.g., causes wireless device 132 to change or transition to an awake state 250, in which main radio interface 210 is enabled, and WUR interface 220 may be disabled).
  • the wireless device receives data from the access node 134 via the main radio interface 210. After receiving data, the wireless device 132 changes or transitions back to sleep state 260.
  • wireless device 133 If another wireless device, e.g., wireless device 133, is mapped to the
  • the wireless device 133 does not detect the frame (that includes WUR sig. seq. 1, and does not include WUR sig. seq. 2) because wireless device 133 (or a WUR interface of wireless device 133) does not detect the WUR sig. seq. 2 to which it is searching when monitoring the channel.
  • a correlator 410 that may be used by wireless device 133 would not output a correlation result that is greater than the threshold 430, because the WUR sig. seq. 1 within the monitored wireless signal does not match the WUR sig. seq. 2 that the wireless device 133 is searching for. If a further wireless device, e.g.
  • the wireless device 131 is mapped to the WUR sig. seq. 1, the wireless device 131 detects the frame (having WUR sig. seq. 1). But since the payload 312 does not comprise identifier/address associated with the wireless device 131, the wireless device 131 does not transition to awake state.
  • a wireless device may transition to an awake state only if the wireless device: 1) performs frame detection based on a WUR signature sequence that is associated with the wireless device (e.g., wireless device detects a WUR signature sequence that is associated with the wireless device); and 2) the address or identifier within the payload of the detected WUR frame is associated with the wireless device.
  • Example 1 is a flow chart illustrating operation of a wireless device according to an example implementation.
  • Operation 710 includes receiving, by a wireless device in a wireless network via first radio interface, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with the wireless device.
  • Operation 720 includes changing a state of the wireless device to a sleep state in which the first radio interface of the wireless device is disabled and a second radio interface of the wireless device is enabled.
  • Operation 730 includes
  • operation 740 includes decoding, by the wireless device only if the frame is detected based on the bit sequence, a payload of the frame.
  • Example 2 According to an example implementation of the method of example 1, wherein the frame comprises a wakeup frame.
  • Example 3 According to an example implementation of the method of any of examples 1-2 and further comprising performing the following if the frame is detected based on the bit sequence: determining whether the payload of the frame comprises a second identifier associated with the wireless device; changing, by the wireless device if the payload of the frame comprises the second identifier associated with the wireless device, a state of the wireless device to an awake state in which the first radio interface of the wireless device is enabled; and maintaining, by the wireless device if the payload of the frame does not include the second identifier associated with the wireless device, the state of the wireless device in the sleep state in which the first radio interface of the wireless device is disabled.
  • Example 4 According to an example implementation of the method of any of examples 1-3, wherein one of the following defines a relationship between the first identifier and the second identifier: the first identifier is the same as the second identifier; and the first identifier is different from the second identifier.
  • Example 5 According to an example implementation of the method of any of examples 1-4 and further comprising performing the following if the frame is detected based on the bit sequence: determining that the payload of the frame comprises a second identifier associated with the wireless device; changing, by the wireless device, a state of the wireless device to an awake state in which the first radio interface of the wireless device is enabled; receiving, by the wireless device, data via the first radio interface; and changing, by the wireless device after receiving the data, a state of the wireless device to the sleep state in which the first radio interface of the wireless device is disabled.
  • Example 6 According to an example implementation of the method of any of examples 1-5 wherein the message indicating a mapping between a set of one or more identifiers and the bit sequence comprises: a message including the bit sequence, an indication of a quantity of identifiers of the set that are mapped to the bit sequence, and each of one or more of the identifiers of the set.
  • Example 7 According to an example implementation of the method of any of examples 1-6 wherein: the first radio interface is a IEEE 802.11 primary connectivity radio interface; and the second radio interface is a wake-up radio interface.
  • Example 8 According to an example implementation of the method of any of examples 1-7 wherein the first identifier associated with the wireless device comprises at least one identifier of the following identifiers: a wake-up radio receiver identifier identifying the second radio interface of the wireless device, wherein the second radio interface comprises a wake-up radio interface; an identifier of the wireless device; an address of the wireless device; and an association identifier for the wireless device.
  • Example 9 According to an example implementation of the method of any of examples 1-8 wherein the first identifier associated with the wireless device comprises at least one of the following: a unicast identifier that identifies a single wireless device or a single receiver; a multi-cast or group identifier that identifies a plurality or group of wireless devices or receivers; and a wild-card identifier that identifies all wireless devices or all receivers within the wireless network.
  • Example 10 According to an example implementation of the method of any of examples 1-9 wherein the second identifier associated with the wireless device comprises at least one identifier of the following identifiers: a wake-up radio receiver identifier identifying the second radio interface of the wireless device, wherein the second radio interface comprises a wake-up radio interface; a device identifier that identifies the wireless device; an address of the wireless device; and an association identifier for the wireless device.
  • Example 11 According to an example implementation of the method of any of examples 1-10 wherein the determining, by the wireless device, that a frame is detected if the bit sequence is detected on a wireless channel while monitoring the wireless channel via the second radio interface comprises: determining, by the wireless device, that a frame is detected based on a correlation between at least the bit sequence and a signal received while monitoring the wireless channel via the second radio interface.
  • Example 12 According to an example implementation of the method of any of examples 1-11 wherein the determining, by the wireless device, that a frame is detected if the bit sequence is detected on a wireless channel while monitoring the wireless channel via the second radio interface comprises: determining, by the wireless device, that a frame is detected based on a correlation between a preamble sequence comprising the bit sequence and a signal received while monitoring the wireless channel via the second radio interface.
  • Example 13 According to an example implementation of the method of any of examples 1-12 wherein the message indicates a first mapping between a first set of one or more identifiers and a first bit sequence that is associated with the wireless device, wherein a first identifier of the first group of one or more identifiers is associated with the wireless device, the message also indicating a second mapping between a second set of one or more identifiers and a second bit sequence.
  • Example 14 According to an example implementation of the method of any of examples 1-13 wherein the message comprises at least one of the following: an association response; a re-association response; a beacon; and a probe response.
  • Example 15 According to an example implementation of the method of any of examples 1-14 wherein the set comprises two or more identifiers, and wherein the two or more identifiers are associated with two or more wireless devices, wherein the two or more identifiers of the set are selected or grouped based on power save requirements of the two or more wireless devices.
  • Example 16 An apparatus comprising means for performing a method of any of examples 1-15.
  • Example 17 An apparatus comprising at least one processor and at least one memory including computer instructions that, when executed by the at least one processor, cause the apparatus to perform a method of any of examples 1-15.
  • Example 18 An apparatus comprising a computer program product including a non-transitory computer-readable storage medium and storing executable code that, when executed by at least one data processing apparatus, is configured to cause the at least one data processing apparatus to perform a method of any of examples 1-15.
  • Example 19 An apparatus comprising a computer program product including a non-transitory computer-readable storage medium and storing executable code that, when executed by at least one data processing apparatus, is configured to cause the at least one data processing apparatus to: receive, by a wireless device in a wireless network via first radio interface, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with the wireless device; change a state of the wireless device to a sleep state in which the first radio interface of the wireless device is disabled and a second radio interface of the wireless device is enabled; determine, by the wireless device, that a frame is detected if the bit sequence is detected on a wireless channel while monitoring the wireless channel via the second radio interface; and decode, by the wireless device only if the frame is detected based on the bit sequence, a payload of the frame.
  • FIG. 8 is a flow chart illustrating operation of an access node according to an example implementation.
  • Operation 810 includes transmitting, by access node in a wireless network, a message indicating a mapping between a set of one or more identifiers and a bit sequence, wherein a first identifier of the set of one or more identifiers is associated with a first wireless device.
  • Operation 820 includes transmitting, by the access node, a wake-up frame including a preamble and a payload; wherein a presence of the bit sequence within the preamble of the wake-up frame triggers the first wireless device to decode the payload of the wake-up frame; and wherein the payload of the wake-up frame comprises a second identifier associated with the wireless device.
  • Example 21 According to an example implementation of the method of example 20, wherein one of the following defines a relationship between the first identifier and the second identifier: the first identifier is the same as the second identifier; and the first identifier is different from the second identifier.
  • Example 22 According to an example implementation of the method of any of examples 20-21 wherein the message indicating a mapping between a set of one or more identifiers and the bit sequence comprises: a message including the bit sequence, an indication of a quantity of identifiers of the set that are mapped to the bit sequence, and each of one or more of the identifiers of the set.
  • Example 23 According to an example implementation of the method of any of examples 20-22 wherein the first identifier associated with the wireless device comprises at least one identifier of the following identifiers: a wake-up radio receiver identifier identifying the second radio interface of the wireless device, wherein the second radio interface comprises a wake-up radio interface; an identifier of the wireless device; an address of the wireless device; and an association identifier for the wireless device.
  • a wake-up radio receiver identifier identifying the second radio interface of the wireless device, wherein the second radio interface comprises a wake-up radio interface; an identifier of the wireless device; an address of the wireless device; and an association identifier for the wireless device.
  • Example 24 According to an example implementation of the method of any of examples 20-23 wherein the first identifier associated with the wireless device comprises at least one of the following: a unicast or single entity identifier that identifies a single wireless device or a single receiver; a multi-cast or group identifier that identifies a plurality or group of wireless devices or receivers; and a wild-card identifier that identifies all wireless devices or all receivers within the wireless network.
  • Example 25 According to an example implementation of the method of any of examples 20-24 wherein the second identifier associated with the wireless device comprises at least one identifier of the following identifiers: a wake-up radio receiver identifier identifying the second radio interface of the wireless device, wherein the second radio interface comprises a wake-up radio interface; a device identifier that identifies the wireless device; an address of the wireless device; and an association identifier for the wireless device.
  • Example 26 According to an example implementation of the method of any of examples 20-25 wherein the message comprises at least one of the following: an association response; a re-association response; a beacon; and a probe response.
  • Example 27 An apparatus comprising means for performing a method of any of examples 20-26.
  • Example 28 An apparatus comprising at least one processor and at least one memory including computer instructions that, when executed by the at least one processor, cause the apparatus to perform a method of any of examples 20-26.
  • Example 29 An apparatus comprising a computer program product including a non-transitory computer-readable storage medium and storing executable code that, when executed by at least one data processing apparatus, is configured to cause the at least one data processing apparatus to perform a method of any of examples 20-26.
  • FIG. 9 is a block diagram of a wireless station (e.g., AP, BS, relay node, eNB, UE or wireless device) 1000 according to an example implementation.
  • the wireless station 1000 may include, for example, one or two RF (radio frequency) or wireless transceivers 1002A, 1002B, where each wireless transceiver includes a transmitter to transmit signals and a receiver to receive signals.
  • the wireless station also includes a processor or processing entity or control unit/entity (controller) 1004 to execute instructions or software and control transmission and receptions of signals, and a memory 1006 to store data and/or instructions.
  • the processing entity 1004 may comprise one or more processors.
  • Processor 1004 may also make decisions or determinations, generate frames, packets or messages for transmission, decode received frames or messages for further processing, and other tasks or functions described herein.
  • Processor 1004 which may be a baseband processor, for example, may generate messages, packets, frames or other signals for transmission via wireless transceiver 1002 (1002 A or 1002B).
  • Processor 1004 may control transmission of signals or messages over a wireless network, and may control the reception of signals or messages, etc., via a wireless network (e.g., after being down-converted by wireless transceiver 1002, for example).
  • Processor 1004 may be programmable and capable of executing software or other instructions stored in memory or on other computer media to perform the various tasks and functions described above, such as one or more of the tasks or methods described above.
  • Processor 1004 may be (or may include), for example, hardware, programmable logic, a programmable processor that executes software or firmware, and/or any combination of these.
  • processor 1004 and transceiver 1002 together may be considered as a wireless
  • transmitter/receiver system for example.
  • a processor or processing entity 1004 may execute software and instructions, and may provide overall control for the station 1000, and may provide control for other systems not shown in FIG. 9, such as controlling input/output devices (e.g., display, keypad), and/or may execute software for one or more applications that may be provided on wireless station 1000, such as, for example, an email program, audio/video applications, a word processor, a Voice over IP application, or other application or software.
  • controlling input/output devices e.g., display, keypad
  • software for one or more applications that may be provided on wireless station 1000, such as, for example, an email program, audio/video applications, a word processor, a Voice over IP application, or other application or software.
  • a storage medium may be provided that includes stored instructions, which when executed by a controller or processor may result in the processor 1004, or other controller or processor, performing one or more of the functions or tasks described above.
  • transceiver(s) 1002A/1002B may receive signals or data and/or transmit or send signals or data.
  • Processor 1004 (and possibly transceivers 1002A/1002B) may control the RF or wireless transceiver 1002A or 1002B to receive, send, broadcast or transmit signals or data.
  • a computer program such as the computer program(s) described above, can be written in any form of programming language, including compiled or interpreted languages, and can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit or part of it suitable for use in a computing environment.
  • a computer program can be deployed to be executed on one computer or on multiple computers at one site or distributed across multiple sites and interconnected by a communication network.
  • Method steps may be performed by one or more programmable processors executing a computer program or computer program portions to perform functions by operating on input data and generating output. Method steps also may be performed by, and an apparatus may be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application- specific integrated circuit).
  • FPGA field programmable gate array
  • ASIC application- specific integrated circuit
  • Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer, chip or chipset.
  • a processor will receive instructions and data from a read-only memory or a random access memory or both.
  • Elements of a computer may include at least one processor for executing instructions and one or more memory devices for storing instructions and data.
  • a computer also may include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto -optical disks, or optical disks.
  • Information carriers suitable for embodying computer program instructions and data include all forms of non- volatile memory, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices;
  • magnetic disks e.g., internal hard disks or removable disks; magneto-optical disks; and CD-ROM and DVD-ROM disks.
  • the processor and the memory may be supplemented by, or incorporated in, special purpose logic circuitry.
  • implementations may be
  • a computer having a display device, e.g., a cathode ray tube (CRT) or liquid crystal display (LCD) monitor, for displaying information to the user and a user interface, such as a keyboard and a pointing device, e.g., a mouse or a trackball, by which the user can provide input to the computer.
  • a display device e.g., a cathode ray tube (CRT) or liquid crystal display (LCD) monitor
  • a user interface such as a keyboard and a pointing device, e.g., a mouse or a trackball
  • Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback, e.g., visual feedback, auditory feedback, or tactile feedback; and input from the user can be received in any form, including acoustic, speech, or tactile input.
  • Implementations may be implemented in a computing system that includes a back-end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front-end component, e.g., a client computer having a graphical user interface or a Web browser through which a user can interact with an implementation, or any combination of such back-end, middleware, or front-end
  • a back-end component e.g., as a data server
  • a middleware component e.g., an application server
  • a front-end component e.g., a client computer having a graphical user interface or a Web browser through which a user can interact with an implementation, or any combination of such back-end, middleware, or front-end
  • Components may be interconnected by any form or medium of digital data communication, e.g., a communication network.
  • Examples of communication networks include a local area network (LAN) and a wide area network (WAN), e.g., the Internet.
  • LAN local area network
  • WAN wide area network

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Abstract

L'invention concerne un procédé comprenant : la réception, par un dispositif sans fil dans un réseau sans fil, via une première interface radio, d'un message indiquant un mappage entre un ensemble d'un ou plusieurs identifiants et une séquence de bits, un premier identifiant de l'ensemble du ou des identifiants étant associé au dispositif sans fil ; la modification d'un état du dispositif sans fil à un état de sommeil dans lequel la première interface radio du dispositif sans fil est désactivée et une seconde interface radio du dispositif sans fil est activée ; la détermination, par le dispositif sans fil, qu'une trame est détectée si la séquence de bits est détectée sur un canal sans fil tout en surveillant le canal sans fil via la seconde interface radio ; et le décodage, par le dispositif sans fil, uniquement si la trame est détectée sur la base de la séquence de bits, d'une charge utile de la trame.
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