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WO2025147024A1 - Procédé et dispositif pour une émission et une réception de trame basées sur une bande d'ondes millimétriques dans un système lan sans fil - Google Patents

Procédé et dispositif pour une émission et une réception de trame basées sur une bande d'ondes millimétriques dans un système lan sans fil Download PDF

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Publication number
WO2025147024A1
WO2025147024A1 PCT/KR2024/021304 KR2024021304W WO2025147024A1 WO 2025147024 A1 WO2025147024 A1 WO 2025147024A1 KR 2024021304 W KR2024021304 W KR 2024021304W WO 2025147024 A1 WO2025147024 A1 WO 2025147024A1
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WO
WIPO (PCT)
Prior art keywords
sectors
sta
sector
information
frame
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Pending
Application number
PCT/KR2024/021304
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English (en)
Korean (ko)
Inventor
박은성
최진수
장인선
정인식
차동주
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LG Electronics Inc
Original Assignee
LG Electronics Inc
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Filing date
Publication date
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Publication of WO2025147024A1 publication Critical patent/WO2025147024A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • 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]

Definitions

  • the present disclosure relates to a method and device for transmitting and receiving frames based on a millimeter wave (mmWave) band in a wireless local area network (WLAN) system.
  • mmWave millimeter wave
  • WLAN wireless local area network
  • Wi-Fi wireless LAN
  • VHT Very High-Throughput
  • HE High Efficiency
  • the technical problem of the present disclosure is to provide a method and device for transmitting and receiving a frame based on a millimeter wave (mmWave) band in a wireless local area network (WLAN) system.
  • mmWave millimeter wave
  • WLAN wireless local area network
  • the technical challenge of the present disclosure is to provide a method and device for performing a sector level sweep (SLS) on a millimeter wave (mmWave) band.
  • SLS sector level sweep
  • mmWave millimeter wave
  • a method may include: transmitting, by a first station (STA), to a second STA, one or more first frames for beamforming training based on M (M ⁇ N) sectors out of a total of N (N>1) sectors; and receiving, by the first STA, a second frame from the second STA, a second frame including information about a best sector out of the M sectors.
  • STA first station
  • N N>1 sectors
  • a method may include: receiving, by a second station (STA), from a first STA, one or more first frames for beamforming training based on M (M ⁇ N) sectors out of a total of N (N>1) sectors; and transmitting, by the second STA, to the first STA, a second frame including information about a best sector out of the M sectors.
  • STA second station
  • M M ⁇ N
  • N N>1 sectors
  • information about the M sectors may be exchanged between the first STA and the second STA.
  • a method and device for transmitting and receiving a frame based on a millimeter wave (mmWave) band in a wireless local area network (WLAN) system can be provided.
  • mmWave millimeter wave
  • WLAN wireless local area network
  • Figure 10 illustrates a BRP transaction that can be applied to the present disclosure.
  • one of the STAs (100, 200) may perform the intended operation of an AP, and the other of the STAs (100, 200) may perform the intended operation of a non-AP STA.
  • the transceivers (106, 206) of FIG. 1 may perform transmission and reception operations of signals (e.g., packets or PPDUs (Physical layer Protocol Data Units) according to IEEE 802.11a/b/g/n/ac/ax/be/bn, etc.).
  • signals e.g., packets or PPDUs (Physical layer Protocol Data Units) according to IEEE 802.11a/b/g/n/ac/ax/be/bn, etc.
  • operations of various STAs generating transmission and reception signals or performing data processing or calculations in advance for transmission and reception signals may be performed in the processors (102, 202) of FIG. 1.
  • the membership of an STA in a BSS can be dynamically changed by the STA turning on or off, the STA entering or leaving the BSS area, etc.
  • an STA can join the BSS using a synchronization process.
  • an STA In order to access all services of the BSS infrastructure, an STA must be associated with a BSS. This association can be dynamically established and may include the use of a Distribution System Service (DSS).
  • DSS Distribution System Service
  • the direct STA-to-STA distance may be limited by the PHY performance. In some cases, this distance limitation may be sufficient, but in some cases, communication between STAs over longer distances may be required.
  • a distributed system may be configured.
  • DS refers to a structure in which BSSs are interconnected.
  • a BSS may exist as an extended component of a network composed of multiple BSSs, as shown in FIG. 2.
  • DS is a logical concept and can be specified by the characteristics of a distributed system medium (DSM).
  • DSM distributed system medium
  • WM wireless medium
  • DSM distributed system medium
  • Each logical medium is used for a different purpose and is used by different components. These media are neither limited to being the same nor limited to being different.
  • the flexibility of a wireless LAN structure can be explained in that multiple media are logically different.
  • a wireless LAN structure can be implemented in various ways, and each wireless LAN structure can be independently specified by the physical characteristics of each implementation example.
  • a DS can support mobile devices by providing seamless integration of multiple BSSs and providing logical services necessary to handle addresses to destinations.
  • a DS can further include a component called a portal that acts as a bridge for connecting wireless LANs to other networks (e.g., IEEE 802.X).
  • An AP is an entity that enables access to a DS through a WM for associated non-AP STAs, and also has the functionality of an STA. Data movement between a BSS and a DS can be performed through an AP.
  • STA2 and STA3 illustrated in FIG. 2 have the functionality of an STA, and provide a function that allows associated non-AP STAs (STA1 and STA4) to access the DS.
  • all APs are basically STAs, all APs are addressable entities.
  • the address used by an AP for communication on a WM and the address used by an AP for communication on a DSM need not necessarily be the same.
  • a BSS consisting of an AP and one or more STAs can be called an infrastructure BSS.
  • an Extended Service Set may be established to provide wider coverage.
  • the BSSs can be partially overlapped, which is a common configuration used to provide continuous coverage.
  • the BSSs can be physically unconnected, and logically there is no limit to the distance between the BSSs.
  • the BSSs can be physically co-located, which can be used to provide redundancy.
  • one (or more) IBSS or ESS networks can physically co-exist in the same space as one (or more) ESS networks. This can correspond to ESS network configurations such as cases where ad-hoc networks operate at locations where ESS networks exist, cases where physically overlapping wireless networks are configured by different organizations, or cases where two or more different access and security policies are required at the same location.
  • FIG. 3 is a diagram for explaining a link setup process to which the present disclosure can be applied.
  • FIG. 3 illustrates a network discovery operation including an active scanning process as an example.
  • active scanning an STA performing scanning transmits a probe request frame to search for APs in the vicinity while moving between channels and waits for a response thereto.
  • a responder transmits a probe response frame to the STA that transmitted the probe request frame as a response to the probe request frame.
  • the responder may be an STA that last transmitted a beacon frame in the BSS of the channel being scanned.
  • the AP transmits a beacon frame, so the AP becomes the responder, and in the IBSS, the STAs within the IBSS take turns transmitting beacon frames, so the responder is not fixed.
  • the scanning operation can also be performed in a passive scanning manner.
  • passive scanning an STA performing scanning moves through channels and waits for a beacon frame.
  • a beacon frame is one of the management frames defined in IEEE 802.11, and is periodically transmitted to notify the existence of a wireless network and to enable an STA performing scanning to find a wireless network and participate in the wireless network.
  • an AP In a BSS, an AP periodically transmits a beacon frame, and in an IBSS, STAs in the IBSS take turns transmitting beacon frames.
  • an STA performing scanning receives a beacon frame, it stores information about the BSS included in the beacon frame and moves to another channel, recording beacon frame information on each channel.
  • An STA receiving a beacon frame stores information related to the BSS included in the received beacon frame, moves to the next channel, and performs scanning on the next channel in the same manner. Comparing active scanning and passive scanning, active scanning has the advantage of lower delay and power consumption than passive scanning.
  • step S320 After the STA discovers the network, an authentication process may be performed in step S320.
  • This authentication process may be referred to as a first authentication process to clearly distinguish it from the security setup operation of step S340 described below.
  • the authentication process includes the STA sending an authentication request frame to the AP, and the AP sending an authentication response frame to the STA in response.
  • the authentication frame used for the authentication request/response corresponds to a management frame.
  • the authentication frame may include information such as an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a Robust Security Network (RSN), a Finite Cyclic Group, etc. These are just some examples of information that may be included in an authentication request/response frame, and may be replaced by other information or may include additional information.
  • RSN Robust Security Network
  • the STA may transmit an authentication request frame to the AP.
  • the AP may determine whether to allow authentication for the STA based on information included in the received authentication request frame.
  • the AP may provide the result of the authentication processing to the STA through an authentication response frame.
  • a security setup process may be performed in step S340.
  • the security setup process of step S340 may be referred to as an authentication process through a Robust Security Network Association (RSNA) request/response
  • the authentication process of step S320 may be referred to as a first authentication process
  • the security setup process of step S340 may be referred to simply as an authentication process.
  • RSNA Robust Security Network Association
  • the security setup process of step S340 may include a process of performing private key setup, for example, through 4-way handshaking via an Extensible Authentication Protocol over LAN (EAPOL) frame. Additionally, the security setup process may be performed according to a security method not defined in the IEEE 802.11 standard.
  • EAPOL Extensible Authentication Protocol over LAN
  • FIG. 4 is a diagram for explaining a backoff process to which the present disclosure can be applied.
  • the basic access mechanism of MAC is the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism.
  • the CSMA/CA mechanism is also called the Distributed Coordination Function (DCF) of IEEE 802.11 MAC, and basically adopts the "listen before talk" access mechanism.
  • DCF Distributed Coordination Function
  • the AP and/or STA may perform a Clear Channel Assessment (CCA) to sense the wireless channel or medium for a predetermined time period (e.g., a DCF Inter-Frame Space (DIFS)) before starting transmission. If the sensing result determines that the medium is in an idle state, the AP and/or STA may start transmitting frames through the medium.
  • CCA Clear Channel Assessment
  • DIFS DCF Inter-Frame Space
  • the AP and/or STA may not start its own transmission, but may wait for a delay period (e.g., a random backoff period) for medium access and then attempt to transmit frames.
  • a delay period e.g., a random backoff period
  • the IEEE 802.11 MAC protocol provides a Hybrid Coordination Function (HCF).
  • the HCF is based on the DCF and the Point Coordination Function (PCF).
  • the PCF is a polling-based synchronous access method in which all receiving APs and/or STAs periodically poll to receive data frames.
  • the HCF has EDCA (Enhanced Distributed Channel Access) and HCCA (HCF Controlled Channel Access).
  • EDCA is a contention-based access method in which a provider provides data frames to multiple users, and HCCA uses a non-contention-based channel access method using a polling mechanism.
  • the HCF includes a medium access mechanism for improving the QoS (Quality of Service) of a wireless LAN, and can transmit QoS data in both a contention period (CP) and a contention-free period (CFP).
  • QoS Quality of Service
  • a random backoff period When an occupied/busy medium changes to an idle state, multiple STAs may attempt to transmit data (or frames). As a measure to minimize collisions, each STA may select a random backoff count, wait for a corresponding slot time, and then attempt to transmit.
  • the random backoff count has a pseudo-random integer value and may be determined as one of the values in the range of 0 to CW.
  • CW is a contention window parameter value.
  • the CW parameter is initially given CWmin, but may take a double value in case of a transmission failure (e.g., when an ACK for a transmitted frame is not received).
  • the STA continues to monitor the medium while counting down the backoff slots according to the determined backoff count value. If the medium is monitored as occupied, the countdown stops and waits, and when the medium becomes idle, the remaining countdown is resumed.
  • STA3 when a packet to be transmitted reaches the MAC of STA3, STA3 can check that the medium is idle for DIFS and transmit the frame right away. The remaining STAs monitor whether the medium is occupied/busy and wait. In the meantime, data to be transmitted may also occur in each of STA1, STA2, and STA5, and each STA can perform a countdown of the backoff slot according to a random backoff count value selected by each STA after waiting for DIFS when the medium is monitored as idle. Assume that STA2 selects the smallest backoff count value and STA1 selects the largest backoff count value.
  • this example shows a case where the remaining backoff time of STA5 is shorter than the remaining backoff time of STA1 when STA2 finishes the backoff count and starts frame transmission.
  • STA1 and STA5 briefly stop the countdown and wait while STA2 occupies the medium.
  • STA1 and STA5 resume the stopped backoff count after waiting for DIFS. That is, they can start frame transmission after counting down the remaining backoff slots by the remaining backoff time. Since the remaining backoff time of STA5 is shorter than that of STA1, STA5 starts frame transmission. While STA2 occupies the medium, STA4 may also have data to transmit.
  • STA4 From STA4's perspective, when the medium becomes idle, it waits for DIFS, performs a countdown according to the random backoff count value it selected, and starts frame transmission.
  • the remaining backoff time of STA5 coincidentally matches the random backoff count value of STA4, and in this case, a collision may occur between STA4 and STA5. If a collision occurs, neither STA4 nor STA5 will receive an ACK, resulting in a failure in data transmission. In this case, STA4 and STA5 can select a random backoff count value and perform a countdown after doubling the CW value.
  • STA1 waits while the medium is occupied by transmissions from STA4 and STA5, and when the medium becomes idle, it waits for DIFS, and then starts transmitting frames after the remaining backoff time has elapsed.
  • the subtype frames of the control frame include RTS (Request-To-Send), CTS (Clear-To-Send), ACK (Acknowledgment), PS-Poll (Power Save-Poll), Block ACK (BlockAck), Block ACK Request (BlockACKReq), NDP notification (null data packet announcement), and Trigger. If the control frame is not a response frame to the previous frame, it is transmitted after the backoff performed after the DIFS (DIFS), and if it is a response frame to the previous frame, it is transmitted without the backoff performed after the SIFS (short IFS).
  • DIFS DIFS
  • SIFS short IFS

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

Abstract

Sont divulgués un procédé et un dispositif d'émission et de réception de trame basées sur une bande d'ondes millimétriques dans un système LAN sans fil. Le procédé selon un mode de réalisation de la présente divulgation peut comprendre les étapes dans lesquelles : une première station (STA) émet, vers une seconde station, une ou plusieurs premières trames pour un entraînement de formation de faisceau sur la base de M (M < N) secteurs parmi N (N > 1) secteurs globaux ; et la première STA reçoit, en provenance de la seconde STA, une seconde trame comprenant des informations concernant le meilleur secteur parmi les M secteurs. Ici, avant l'entraînement de formation de faisceau, des informations concernant les M secteurs peuvent être échangées entre la première STA et la seconde STA
PCT/KR2024/021304 2024-01-05 2024-12-27 Procédé et dispositif pour une émission et une réception de trame basées sur une bande d'ondes millimétriques dans un système lan sans fil Pending WO2025147024A1 (fr)

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KR10-2024-0002345 2024-01-05
KR20240002345 2024-01-05

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WO2025147024A1 true WO2025147024A1 (fr) 2025-07-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120005461A (ko) * 2009-04-17 2012-01-16 마벨 월드 트레이드 리미티드 분절식 빔포밍
KR20170004183A (ko) * 2015-07-01 2017-01-11 삼성전자주식회사 무선 통신시스템의 빔 선택 장치 및 방법
KR101825852B1 (ko) * 2013-09-08 2018-02-05 인텔 코포레이션 무선 통신 빔포밍 장치, 시스템 및 방법
KR20190011807A (ko) * 2016-07-15 2019-02-07 엘지전자 주식회사 무선랜 시스템에서의 데이터 송수신 방법 및 이를 위한 장치
KR20200004601A (ko) * 2018-07-04 2020-01-14 삼성전자주식회사 데이터 통신을 제어하는 방법, 전자 장치 및 저장 매체

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120005461A (ko) * 2009-04-17 2012-01-16 마벨 월드 트레이드 리미티드 분절식 빔포밍
KR101825852B1 (ko) * 2013-09-08 2018-02-05 인텔 코포레이션 무선 통신 빔포밍 장치, 시스템 및 방법
KR20170004183A (ko) * 2015-07-01 2017-01-11 삼성전자주식회사 무선 통신시스템의 빔 선택 장치 및 방법
KR20190011807A (ko) * 2016-07-15 2019-02-07 엘지전자 주식회사 무선랜 시스템에서의 데이터 송수신 방법 및 이를 위한 장치
KR20200004601A (ko) * 2018-07-04 2020-01-14 삼성전자주식회사 데이터 통신을 제어하는 방법, 전자 장치 및 저장 매체

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