WO2018074749A1 - Procédé de gestion de puissance dans un système de réseau lan sans fil et terminal sans fil l'utilisant - Google Patents

Procédé de gestion de puissance dans un système de réseau lan sans fil et terminal sans fil l'utilisant Download PDF

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Publication number
WO2018074749A1
WO2018074749A1 PCT/KR2017/010435 KR2017010435W WO2018074749A1 WO 2018074749 A1 WO2018074749 A1 WO 2018074749A1 KR 2017010435 W KR2017010435 W KR 2017010435W WO 2018074749 A1 WO2018074749 A1 WO 2018074749A1
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WO
WIPO (PCT)
Prior art keywords
channel
packet
wur
module
wireless terminal
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PCT/KR2017/010435
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English (en)
Korean (ko)
Inventor
김서욱
류기선
박현희
김정기
조한규
Original Assignee
엘지전자 주식회사
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Publication of WO2018074749A1 publication Critical patent/WO2018074749A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • 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
    • 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

  • the IBSS 15 is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. Thus, in the IBSS 15, the STAs 150-1, 150-2, 150-3, 155-4, and 155-5 are managed in a distributed manner.
  • FIG. 3 is a diagram illustrating an example of a HE PPDU.
  • the control information field proposed in this embodiment may be HE-SIG-B included in the HE PPDU as shown in FIG. 3.
  • the HE PPDU according to FIG. 3 is an example of a PPDU for multiple users.
  • the HE-SIG-B may be included only for the multi-user, and the HE-SIG-B may be omitted in the PPDU for the single user.
  • FIG. 4 shows an internal block diagram of a wireless terminal receiving a wakeup packet.
  • a wireless terminal comprising a main radio module 411 in an inactive state may receive a frame transmitted by another wireless terminal (e.g., AP) until the main radio module is woken up by the WUR module 412. For example, it is not possible to receive an 802.11 type PPDU).
  • a wireless terminal that includes a main radio module 411 that is in an active state (ie, in an ON state) may receive a frame (eg, an 802.11 type PPDU) transmitted by another wireless terminal (eg, an AP).
  • a frame eg, an 802.11 type PPDU
  • another wireless terminal eg, an AP
  • the terms for the activation state and the turn-on state may be used interchangeably.
  • the terms deactivation state and turn-off state may be used interchangeably to indicate an OFF state of a particular module included in the wireless terminal.
  • the second wireless terminal 420 may transmit user data based on a main radio (ie, 802.11).
  • the second wireless terminal 420 can transmit a wakeup packet (WUP) for the WUR module 412.
  • WUP wakeup packet
  • the MAC header field 624 may include address information (or an identifier of a receiving apparatus) indicating a receiving terminal receiving the wakeup packet 600.
  • the frame body field 626 may include other information of the wakeup packet 600.
  • the transmission power of the transmitting terminal may not be greatly considered.
  • the reason why the OOK technique is used in the present embodiment is because power consumption in the decoding procedure of the received signal is very small.
  • the existing Wi-Fi power consumption is about 100mW.
  • power consumption of Resonator + Oscillator + PLL (1500uW)-> LPF (300uW)-> ADC (63uW)-> decoding processing (OFDM receiver) (100mW) may occur.
  • the wireless terminal according to the present embodiment may use an existing 802.11 OFDM transmitter to generate a pulse according to the OOK technique.
  • the existing 802.11 OFDM transmitter can generate a sequence having 64 bits by applying a 64-point IFFT.
  • a coefficient corresponding to a subcarrier whose subcarrier indices are '-6' to '-1' in the 13-bit sequence may be set to '1' or '-1'.
  • a coefficient corresponding to a subcarrier whose subcarrier indices are '1' to '6' in the 13-bit sequence may be set to '1' or '-1'.
  • the basic data rate for one information may be 125 Kbps (8us) or 62.5Kbps (16us).
  • the first channel center frequency fc1 for the first channel ch # 1 of FIG. 10 may be 2.412 GHz.
  • the first channel ch # 1 may be defined between 2.401 GHz and 2.423 GHz.
  • the second channel center frequency fc2 for the second channel ch # 2 may be 2.417 GHz.
  • the second channel ch # 2 may be defined between 2.406 GHz and 2.428 GHz.
  • the third channel center frequency fc3 for the third channel ch # 3 of FIG. 10 may be 2.422 GHz.
  • the third channel ch # 3 may be defined between 2.411 GHz and 2.433 GHz.
  • the fourth channel center frequency fc4 for the fourth channel ch # 4 may be 2.427 GHz.
  • the third channel ch # 3 may be defined between 2.416 GHz and 2.438 GHz.
  • the 36th channel (ch # 36) having a center frequency of 5.180 GHz
  • the 40th channel (ch # 40) having a center frequency of 5.200 GHz
  • the 44th channel (ch # 44) having a center frequency of 5.220 GHz.
  • channel 48 (ch # 48) having a center frequency of 5.240 GHz.
  • the channelization scheme of the wireless channel for 5GHz band-based communication shown in FIG. 11 is just an example, and it will be understood that the present specification is not limited thereto.
  • the AP 1300 may correspond to the second wireless terminal 520 of FIG. 5.
  • the horizontal axis of the AP 1300 may indicate a time ta.
  • the vertical axis of the AP 1300 may be associated with the presence of a packet (or frame) to be transmitted by the AP 1300.
  • the WUR STA 1310 may correspond to the first wireless terminal 510 of FIG. 5.
  • the WUR STA 1310 may include a main radio module WUR # m 1311 and a WUR module WUR # w 1312.
  • the main radio module 1311 of FIG. 13 may correspond to the main radio module 511 of FIG. 5.
  • the horizontal axis of the main radio module 1311 may indicate a time tm.
  • An arrow displayed at the bottom of the horizontal axis of the main radio module 1311 may be associated with a power state (eg, an ON state or an OFF state) of the main radio module 1311.
  • the vertical axis of the main radio module 1311 may be associated with the presence of a packet to be transmitted based on the main radio module 1311.
  • the WUR module 1312 of FIG. 13 may correspond to the WUR module 512 of FIG. 5.
  • the wakeup packet may include a payload modulated according to an on-off keying (OOK) technique for the WUR module 1312.
  • the payload may be received based on a first wireless channel (WUR ch # 1) which is a receiving channel for the WUR module.
  • the first wireless channel may be preset through an association procedure between the AP 1300 and the WUR STA 1310.
  • the WUR STA 1310 may generate a wakeup signal that is internal primitive information generated according to the received wakeup packet WUP (eg, FIG. 5). Based on 523 of FIG. 1, the main radio module 1311 may be controlled to enter an activated state (ie, an ON state).
  • the wakeup notification packet WNP may be a packet transmitted on a contention basis for a wireless channel.
  • the wakeup notification packet WNP may be transmitted based on the main radio module 1311 in an activated state (ie, in an ON state).
  • the AP 1300 After a predetermined time d1 has elapsed since the reception of the wakeup notification packet WNP, the AP 1300 sends a first response packet ACK # 1 for notifying successful reception of the wakeup notification packet WNP. 1310).
  • the predetermined time d1 may be SIFS.
  • the channel switch announcement (CSA) packet indicates a second wireless channel (WUR ch # 2) which is any one of a plurality of subchannels 1221, 1222, and 1223 corresponding to the second channel 1220.
  • Channel information may be included.
  • the WUR STA 1310 may control the WUR module 1312 to enter a turn-on state (that is, an ON state). have.
  • the WUR STA 1310 may control the WUR module 1312 to operate based on the second radio channel WUR ch # 2 at a predetermined time T2 according to the channel switch announcement (CSA) packet.
  • CSA channel switch announcement
  • the wakeup packet WUP may include a legacy preamble (eg, 610 of FIG. 6) modulated according to an orthogonal frequency-division multiplexing (OFDM) technique to provide coexistence with the legacy terminal.
  • a legacy preamble eg, 610 of FIG. 6
  • OFDM orthogonal frequency-division multiplexing
  • the wakeup packet WUP includes a payload (eg, 620 of FIG. 6) modulated according to an on-off keying (OOK) technique for a WUR module (eg, 512 of FIG. 5 and 1312 of FIG. 13). can do.
  • a payload eg, 620 of FIG. 6
  • OOK on-off keying
  • each of the plurality of subchannels may be set to have a bandwidth corresponding to 4.0625 MHz.
  • step S1440 after receiving the first response packet, the first wireless terminal changes the channel switch announcement (CSCA) packet for changing the receiving channel (receiving channel) to the second wireless channel (WUR ch # 2). Can be received from.
  • CSCA channel switch announcement
  • the second wireless channel WUR ch # 2 may be any one of a plurality of subchannels (eg, 1221, 1222, 1223 of FIG. 12) corresponding to the secondary 20MHz channel.
  • the first wireless terminal may control the WUR module to operate based on the second wireless channel at a point in time determined according to the channel switch announcement (CSA) packet. That is, the first wireless terminal may receive a wakeup packet (WUP) from the second wireless terminal based on the WUR module 1312 in a turn-on state (ie, in an ON state) through the second wireless channel.
  • WUP wakeup packet
  • the AP 1500 may correspond to the AP 1300 of FIG. 13.
  • the horizontal axis of the AP 1500 may indicate a time ta.
  • the vertical axis of the AP 1500 may be associated with the presence of a packet to be transmitted by the AP 1500.
  • the description of the wakeup periods TW to T1 of FIG. 15 may be replaced with the description of the wakeup periods TW to T1 of FIG. 13.
  • the guard time according to the wakeup packet WUP may be understood as the first period T1 to T2 of FIG. 15.
  • the first sections T1 to T2 of FIG. 15 may be set according to a predetermined parameter for the guard time.
  • the time required for the main radio module 1511 to enter the activated state (ie, the ON state) according to the wake-up signal may be referred to as a turn-on delay (TOD).
  • TOD turn-on delay
  • the turn-on delay is not only the time according to the internal primitive information of the WUR STA 1510, but also the time for the WUR STA 1510 to be combined with the AP 1500 based on the main radio module 1511. It may include.
  • the WUR STA 1510 may control the WUR module 1512 to enter a turn-off state (that is, an OFF state). have. Subsequently, until the first interval T1 to T2 elapses (T2), the WUR STA 1510 may control the WUR module 1512 to maintain a turn-off state (ie, an OFF state).
  • the turn-off delay may be a relatively small value compared to the turn-on delay (TOD).
  • the WUR STA 1510 is based on the WUR module 1512 that is in a turn-on state (ie, in an ON state) through a second wireless channel (WUR ch # 2).
  • a wakeup packet (WUP) may be received from 1500.
  • the first main radio module 1911 may enter an activated state (ie, an ON state). Subsequently, the first WUR STA 1910 may control the first main radio module 1911 to maintain an activation state (that is, an ON state) until the point in time T2 at which the first sections T1 to T2 end. have.
  • an activated state ie, an ON state
  • the first WUR STA 1910 may control the first main radio module 1911 to maintain an activation state (that is, an ON state) until the point in time T2 at which the first sections T1 to T2 end. have.
  • the first wakeup is a response to the trigger frame TRG from the first WUR STA 1910.
  • the notification packet WNP # 1 may be received.
  • the third wireless channel WUR ch # 3 may be understood as any one subchannel that does not overlap the first wireless channel WUR ch # 1 among the plurality of subchannels 1211, 1212, and 1213 of FIG. 12. Can be.
  • the AP 1900 may receive a second acknowledgment packet (ACK # 2) indicating a successful reception of a channel switch announcement (CSA) packet from the first WUR STA 1910.
  • the AP 1900 may receive a third acknowledgment packet (ACK # 3) indicating successful reception of a channel switch announcement (CSA) packet from the 2 WUR STA 1920.
  • ACK # 2 a second acknowledgment packet
  • CSA channel switch announcement
  • ACK # 3 a third acknowledgment packet
  • each WUR STA 1910, 1920 switches each component for each WUR STA 1910, 1920 included in a channel switch announcement (CSA) packet. Can operate in WUR mode.
  • CSA channel switch announcement
  • FIG. 20 another example of FIG. 20 is that there is no trigger frame (TRG) for checking whether a plurality of main radio modules included in each of a plurality of WUR STAs are in an active state.
  • TRG trigger frame
  • the channel switch packet CSA for the plurality of WUR STAs is transmitted without transmitting the trigger frame TRG. ) Can be sent.
  • the processor 2160 may implement the functions, processes, and / or methods proposed in the present embodiment.
  • the processor 2160 may be implemented to perform the non-AP STA operation according to the present embodiment described above.
  • the processor 2160 may perform an operation of the non-AP STA disclosed in the present embodiment of FIGS. 1 to 20.
  • Processors 2110 and 2160 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters that convert baseband signals and wireless signals to and from each other.
  • the memories 2120 and 2170 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the RF unit 2130 and 2180 may include one or more antennas for transmitting and / or receiving a radio signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte, selon un mode réalisation, sur un procédé de gestion de puissance exécuté par un premier terminal sans fil dans un système de réseau LAN sans fil, ledit procédé comprenant les étapes consistant : à recevoir, d'un second terminal sans fil, un paquet de réveil donnant comme instruction à un module radio principal d'entrer dans un état actif, le paquet de réveil comprenant une charge utile modulée selon un schéma OOK pour un module WUR et la charge utile étant reçue sur la base d'un premier canal sans fil, qui est un canal de réception pour le module WUR ; à transmettre, au second terminal sans fil, un paquet de notification de réveil informant que le module radio principal entre dans l'état actif ; à recevoir, du second terminal sans fil, un premier paquet d'accusé de réception, qui est une réponse au paquet de notification de réveil, sur la base du module radio principal ; à recevoir, du second terminal sans fil, un paquet d'annonce de commutation de canal pour faire passer le canal de réception à un second canal sans fil, après réception du premier paquet d'accusé de réception, le paquet d'annonce de commutation de canal étant reçu sur la base du module radio principal.
PCT/KR2017/010435 2016-10-21 2017-09-22 Procédé de gestion de puissance dans un système de réseau lan sans fil et terminal sans fil l'utilisant WO2018074749A1 (fr)

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US201662410858P 2016-10-21 2016-10-21
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020192949A1 (fr) * 2019-03-27 2020-10-01 Telefonaktiebolaget Lm Ericsson (Publ) Utilisation d'un récepteur de réveil avec bluetooth à faible énergie

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US20140321415A1 (en) * 2011-12-05 2014-10-30 Lg Electronics Inc. Method and apparatus for transmitting channel switching information
US20160278147A1 (en) * 2015-03-18 2016-09-22 Intel IP Corporation Procedures to provision and attach a cellular internet of things device to a cloud service provider

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US20140321415A1 (en) * 2011-12-05 2014-10-30 Lg Electronics Inc. Method and apparatus for transmitting channel switching information
US20160278147A1 (en) * 2015-03-18 2016-09-22 Intel IP Corporation Procedures to provision and attach a cellular internet of things device to a cloud service provider

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FRANK HSU: "LP WUR Wake-up Packet Identity Considerations", IEEE 802.11-16/ 0402R0, 13 March 2016 (2016-03-13), pages 1 - 9 *
MINYOUNG PARK: "LP-WUR (Low- Power Wake-Up Receiver) Follow-Up", IEEE 802.11-16/0341R0, 14 March 2016 (2016-03-14), pages 1 - 9 *
YONGHO SEOK: "Coexistence Mechanism for Wakeup Radio Signal", IEEE 802.11-16/1114R0, 26 August 2016 (2016-08-26), pages 1 - 11 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020192949A1 (fr) * 2019-03-27 2020-10-01 Telefonaktiebolaget Lm Ericsson (Publ) Utilisation d'un récepteur de réveil avec bluetooth à faible énergie

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