WO2016088958A1 - Procédé de transmission de fdr dans un dispositif et système lan sans fil s'y rapportant - Google Patents

Procédé de transmission de fdr dans un dispositif et système lan sans fil s'y rapportant Download PDF

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Publication number
WO2016088958A1
WO2016088958A1 PCT/KR2015/005937 KR2015005937W WO2016088958A1 WO 2016088958 A1 WO2016088958 A1 WO 2016088958A1 KR 2015005937 W KR2015005937 W KR 2015005937W WO 2016088958 A1 WO2016088958 A1 WO 2016088958A1
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WIPO (PCT)
Prior art keywords
subband
data
sta
specific
transmitting
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PCT/KR2015/005937
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English (en)
Korean (ko)
Inventor
김서욱
윤지훈
김정기
조한규
Original Assignee
엘지전자 주식회사
서울과학기술대학교 산학협력단
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Priority to KR1020177012641A priority Critical patent/KR101931949B1/ko
Publication of WO2016088958A1 publication Critical patent/WO2016088958A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • 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 following description relates to a FOR transmission scheme and a device therefor in a wireless communication system, in particular, a WLAN system.
  • WLAN wireless local area network
  • Wireless LAN is based on the radio frequency technology, using a portable terminal device such as a personal digital assistant (PDA), a laptop computer, a portable multimedia player (PMP), etc. It is a technology that allows access to the Internet wirelessly at home, at work, or in specific service areas.
  • PDA personal digital assistant
  • PMP portable multimedia player
  • IEEE 802.11a and b are described in 2.4. Using unlicensed band at GHz or 5 GHz, IEEE 802.11b provides a transmission rate of 11 Mbps, and IEEE 802.11a provides a transmission rate of 54 Mbps.
  • IEEE 802.11g uses Orthogonal frequency-division mult multiplexing (OFDM) at 2.4 GHz, 54 It provides a transmission rate of Mbps.
  • IEEE 802. 11 ⁇ applies multi-input multiple-multiple output OFDM (MIDM-OFDM) to provide a transmission rate of 300 Mbps for four spatial streams. IEEE 802.11 ⁇ supports channel bandwidths up to 40 MHz, in this case 600 Mbps.
  • the wireless LAN standard described above uses up to 160MHz bandwidth, supports eight spatial streams, and goes through the IEEE 802.11ac standard supporting speeds of up to lGbi t / s. It is done. [Detailed Description of the Invention]
  • FDR Full Duplex Radio
  • a first in one radio channel The AP determines that the specific AP is transmitting the first data to the specific STA through the subband, The second STA transmits the second data to the AP 1 1 through the second subband in the one wireless channel during the first data transmission, and the first STA transmits the second data according to the preamble information of the first data.
  • the present invention proposes a data transmission method for determining whether to select a subband as a subband separated from the first subband by a predetermined guard band.
  • a specific STA is identified through a first subband in one radio channel. Confirming that the first data is being transmitted to the AP, and transmitting the second data to the first STA through a second subband in the one wireless channel during the first data transmission of the specific STA, wherein the first data
  • the first AP proposes a data transmission method for determining whether to select the second subband as a subband separated from the first subband by a predetermined guard band.
  • a first station (STA) apparatus for transmitting data to a first access point (AP) in a wireless LAN system
  • STA first station
  • AP access point
  • a transceiver configured to be; And a processor connected to the transceiver to control an operation of the transceiver, wherein the processor determines that a specific AP is transmitting first data to a specific STA through a first subband in the one radio channel; Allow the transceiver to transmit second data to the first AP via a second subband in the one wireless channel of the first data transmission of the specific AP.
  • the processor may determine whether to select the second subband as a subband spaced apart from the first subband by a predetermined guard band according to the preamble information of the first data. Suggest.
  • a first AP device for transmitting data to a first station (STA) in a WLAN system
  • signal transmission and reception are possible at the same time through one wireless channel.
  • a transceiver configured to be; And a processor connected to the transceiver to control an operation of the transceiver, wherein the processor determines that a specific STA transmits first data to a specific AP through a first subband in the one radio channel. Through a second subband in the one radio channel of the first data transmission of the specific STA
  • 1 is a view showing an example of the configuration of a wireless LAN system.
  • 2 is a view showing another example of the configuration of a wireless LAN system.
  • 3 is a view for explaining the DCF mechanism in the WLAN system.
  • 4 and 5 are exemplary diagrams for explaining the problem of the existing masonry solving mechanism.
  • FIG. 6 is a diagram for describing a mechanism for solving a hidden node problem using an RTS / CTS frame.
  • FIG. 7 is a diagram for explaining a mechanism for solving an exposed node problem using an RTS / CTS frame.
  • FIG. 8 is a diagram for describing in detail a method of operating using the RTS / CTS frame as described above.
  • FIG. 9 shows a conceptual diagram of a terminal and a base station supporting FDR in a wireless communication system.
  • FIG. 10 shows a conceptual diagram for IDI occurring when a base station uses a FO mode (simultaneous transmission / reception mode using the same frequency) in the same resource.
  • FO mode simultaneous transmission / reception mode using the same frequency
  • FIG. 11 is a view for explaining a wireless LAN environment to which an embodiment of the present invention can be applied.
  • 12 and 13 are diagrams for explaining a method for the terminal to transmit data to the AP according to an embodiment of the present invention.
  • FIG. 14 illustrates a method in which a terminal transmits data to an AP without using a guard band in the situation as shown in FIG. 13.
  • a "terminal" is a concept of any user equipment performing a communication function, including a STA in a WLAN system and a UE in an LTE-A system.
  • FIG. 1 is a view showing an example of the configuration of a wireless LAN system.
  • the WLAN system includes one or more basic service set (Bas i Service Set, BSS).
  • BSS is a set of stations (STAs) that can successfully synchronize and communicate with each other.
  • STA is a medium access control (Medium Access Control, MAC) for the wireless medium
  • the portable terminal operated by the user among the STAs is a non-AP STA, and when referred to simply as an STA, it may also refer to a non-AP STA.
  • Non-AP STA is a terminal, a wireless transmit / receive unit (WTRU), a user equipment (User)
  • WTRU wireless transmit / receive unit
  • User user equipment
  • UE Equipment
  • MS Mobile Station
  • MS Mobile Terminal
  • Mobile Subscriber Unit Radio Equipment
  • the AP is an entity that provides access to the Distribution System (Distribution System, DS) through the wireless medium to the ⁇ 350 60 3 ⁇ 4 ⁇ coupled to it.
  • the AP may be called a centralized controller, a base station (BS), a Node-B, a base transceiver system (BTS), or a site controller.
  • BS base station
  • BTS base transceiver system
  • BSS can be divided into an infrastructure (SS) BSS and (Independent) BSS (IBSS).
  • SS infrastructure
  • IBSS Independent BSS
  • IBSS means BSS that does not include AP, and because it does not include AP, it does not allow access to DS and forms a self-contained network.
  • FIG. 2 is a view showing another example of the configuration of a wireless LAN system.
  • the BSS shown in FIG. 2 is an infrastructure BSS.
  • Infrastructure BSS includes one or more STAs and APs.
  • communication between non-APSTAs is performed via an AP.
  • AP access point
  • direct communication between non-AP STAs is also possible.
  • a plurality of infrastructure BSSs may be interconnected through a DS.
  • a plurality of BSSs connected through a DS is called an extended service set (ESS).
  • ESS extended service set
  • STAs included in the ESS may communicate with each other, and a non-APSTA may move from one BSS to another BSS while communicating seamlessly within the same ESS.
  • the DS is a mechanism (mechanism) for connecting a plurality of APs, it does not necessarily need to be a network, there is no restriction on the form if it can provide a predetermined distribution service.
  • the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other.
  • 802.11 introduced the distributed coordination function (DCF), a carrier sense multiple access / collision avoidance (CSMA / CA) mechanism.
  • DCF distributed coordination function
  • CSMA / CA carrier sense multiple access / collision avoidance
  • 3 is a view for explaining the DCF mechanism in the WLAN system.
  • the DCF performs a clear channel assessment (CCA) that senses a medium for a specific period (eg, DIFS: DCF inter-frame space) before STAs having data to transmit transmit data.
  • CCA clear channel assessment
  • the STA can transmit a signal using the medium.
  • data can be transmitted after waiting a further random backoff period (random backof f per iod). In this case, the random backoff period makes it possible to avoid the stratification.
  • each STA has a probability of different backoff intervals, which is different from each other. This is because it has a transmission time. When one STA starts transmission, the other STAs cannot use the medium.
  • the random backoff count is a pseudo-random integer value and selects one of the uniformly distributed values in the range of [0 CW]. CW means 'content ion window'.
  • CW parameter takes the CWmin value as the initial value, but if the transmission fails, the value is doubled. For example, if an ACK response for a transmitted data frame is not received, it can be regarded as a stagnation. If CT value has CWmax value, it maintains CWmax value until data transmission succeeds, and data transmission succeeds and resets to CWmin value. At this time, CW, CWmin, CWmax is preferably to maintain 2 "-1 for convenience of implementation and operation.
  • the STA selects the random backoff count within the range of [0 CW] and continuously monitors the medium while the backoff slot is counted down. In the meantime, if the medium is busy, When it stops and the medium is idle again, it resumes counting down the remaining backoff slots.
  • STA3 when there are data that STAs want to send, STA3 immediately transmits a data frame because the medium is idle as much as DIFS, and the remaining STAs wait for the medium to be idle. Since the medium has been busy for some time, several STAs will see an opportunity to use the medium. Thus, each STA selects a random backoff count. In FIG. 3, STA 2, which has selected the smallest backoff count, transmits a data frame.
  • FIG. 3 illustrates that STA 5, which has the next smallest random backoff count value after STA 2 and stops counting down when the medium is busy, starts data frame transmission after counting down the remaining backoff slots. Overlap with the backoff count value shows that a stratification has occurred. In this case, since both STAs do not receive the ACK answer after the data transmission, the CW is doubled and the random backoff count value is selected again.
  • the terminal may use physical carrier sensing and virtual carrier sensing to determine whether the DCF medium is busy or idle.
  • Physical carrier sensing is performed at the PHY (physicaI layer) stage, and is used for energy detect ion or preamble detection. detection is done. For example, if the voltage level at the receiver is measured or if the preamble is determined to be read, it can be determined that the medium is busy.
  • Virtual carrier sensing is performed by setting a NAVC network allocation vector to prevent other STAs from transmitting data through a value of a duration field of a MAC header.
  • a robust collision detection mechanism was introduced, which can be seen in the following two examples. For convenience, it is assumed that the carrier sensing range is the same as the transmission range.
  • 4 and 5 are exemplary diagrams for explaining the problem of the existing masonry solving mechanism.
  • FIG. 4 is a diagram for explaining hidden node issues.
  • STA A and STA B are in communication, and STA C has information to transmit.
  • STAA when STAA is transmitting information to STAB, when STAC carrier senses the medium before sending data to STAB, STA C is out of STA A's transmission range, so STA A cannot detect signal transmission and the medium is idle. There is a possibility that it is in a state As a result, STA B receives the information of STA A and STA C at the same time, a collision occurs.
  • STA A may be referred to as a hidden node (hidden node) of STA C.
  • FIG. 5 is a diagram for explaining exposed node issues.
  • the STAB is transmitting data to STAA.
  • the STAC performs carrier sensing. Since the STA B is transmitting information, the STAC detects that the medium is busy. As a result, whether STA C would like to send data to STA D Even if the medium is sensed as busy, there is a situation that the user needs to wait unnecessarily until the medium becomes idl e. That is, STA A may prevent transmission of information of STA C even though it is outside the CS range of STA C. At this time, STA C becomes an exposed node of STA B.
  • the neighboring STAs transmit information of two STAs by introducing a short s ignaling packet such as a request to send (RTS) and a c lear to send (CTS) in order to use the layer avoidance mechanism well. It can leave room for overhearing or not. That is, when the STA to transmit the data transmits the RTS frame to the STA receiving the data, the receiving STA may transmit the CTS frame to the neighboring UEs to inform that it will receive the data.
  • a short s ignaling packet such as a request to send (RTS) and a c lear to send (CTS) in order to use the layer avoidance mechanism well. It can leave room for overhearing or not. That is, when the STA to transmit the data transmits the RTS frame to the STA receiving the data, the receiving STA may transmit the CTS frame to the neighboring UEs to inform that it will receive the data.
  • RTS request to send
  • CTS c lear to send
  • FIG. 6 is a diagram for describing a mechanism for solving a hidden node problem using an RTS / CTS frame.
  • STA A and STA C are both trying to transmit data to STA B.
  • STA A sends the RTS to STA B
  • STA B transmits the CTS to both STA A and STA C around it.
  • STA C waits until the data transmission of STA A and STA B is completed, thereby avoiding the dolmens.
  • FIG. 7 is a view for explaining a mechanism for solving the node problem exposed using the RTS / CTS frame.
  • the STA C may know that the stratification does not occur even when transmitting data to another STA D. That is, STA B transmits the RTS to all the surrounding terminals, and only STA A having the data to actually transmit the CTS. STA C receives RTS only and CTS of STA A STA A can see that it is outside the CS range of STC C because it did not receive.
  • FIG. 8 is a diagram for describing in detail a method of operating using the RTS / CTS frame as described above.
  • the transmitting STA may transmit an RTS frame to the receiving STA that may transmit a signal after DIFF (Di str iituated IFS).
  • the receiving STA receiving the RTS frame may transmit the CTS to the transmitting STA after SIFS (Short IFS).
  • SIFS Short IFS
  • the transmitting STA receiving the CTS from the receiving STA may transmit data as shown in FIG. 8 after SIFS.
  • the receiver STA receiving the data may transmit an ACK response to the data received after SIFS.
  • the STA that has received the RTS / CTS of the transmitting STA among the neighboring STAs other than the above-mentioned transmitting and receiving STAs is busy of the medium through the reception of the RTS / CTS as described above with reference to FIGS. 6 and 7. It may determine whether or not, and accordingly can set a network al locat ion vector (NAV). When the NAV period ends, a process for solving the stratification as described above with reference to FIG. 3 may be performed after DIFS.
  • NAV network al locat ion vector
  • Ful duplex radio means a system that wants to send and receive at the same time using the same resources in the transmission device.
  • the same resource may mean the same frequency at the same time.
  • FIG. 9 shows a conceptual diagram of a terminal and a base station supporting FDR in a wireless communication system.
  • the system shown in Figure 9 is an LTE or LTE-A based macro base station (eNB) and small base stations (Femto, Pico / Micro) base stations are assumed.
  • eNB macro base station
  • Femto, Pico / Micro small base stations
  • the base station black means that the uplink signal transmitted from the terminal or the like is received by the adjacent base station or the terminal to act as interference.
  • Inter-device interference (hereinafter referred to as IDI) is interference occurring only in the FDR due to using the same resource in the cell (cel l).
  • FIG. 10 shows a conceptual diagram for an IDI generated when a base station uses an FD mode (simultaneous transmission / reception mode using the same frequency) in the same resource.
  • 10 is a simple example showing two UE JE1 and UE2) for easy IDI description, and the present invention does not limit the number of UEs.
  • IDI is not generated by using frequency division duplex (FDD) or time division duplex (TDD), that is, different transmission / reception resources. Interference of neighbor cells on the existing communication system is still valid in the FDR system, but the description thereof is omitted.
  • FDD frequency division duplex
  • TDD time division duplex
  • the biggest problem may be interference between the DL and UL.
  • Traditionally only one UL or DL at a time in a network
  • simultaneous DL and UL exist.
  • interference occurs when the channels used by the DL and the UL are adjacent to each other.
  • One embodiment of the present invention to be described below is intended to solve this.
  • FIG. 11 is a view for explaining a wireless LAN environment to which an embodiment of the present invention can be applied.
  • the present invention relates to a terminal / STA that supports FDR, but the application of FDR does not assume that signals are simultaneously transmitted and received through subbands in the same channel. That is, although UL and DL communication can be performed simultaneously in one channel, it is assumed that UL and DL communicate through different subbands.
  • a subband in which the AP of FIG. 11 transmits data to an STA supporting FDR and a subband in which the STA supporting FDR transmits data to the AP are different.
  • the AP according to the present embodiment supports not only the terminal / STA supporting the FDR but also the terminal / STA not supporting the conventional FDR, as shown in FIG.
  • FIGS. 12 and 13 are diagrams for explaining a method for a terminal to transmit data to an AP according to an embodiment of the present invention.
  • the "subband” may be a 20 MHz channel in 802.11, or may be a resource unit smaller than a 20 MHz channel when 0FDMA is applied.
  • the part marked "AP->STA” indicates the DL PPDU that the AP is transmitting, including PLCP preamble and header Can be configured.
  • the portion marked "STA->AP” indicates the PPDU being transmitted by the STA.
  • the AP may start transmitting on a specific subband.
  • the PLCP header of the PPDU transmitted by the AP may include the address or BSS color information of the AP currently being transmitted. Through this information, UEs can know that their AP is currently transmitting data.
  • BSS color information transmitted through the PLCP header is specified in the IEEE 802.11ah standard as information for controlling the reception operation by distinguishing the BSS for transmitting data by the receiving terminal.
  • the terminal also has a frame to transmit to the AP, it can transmit data using the empty subband.
  • the AP since its AP is currently transmitting data, it is proposed to transmit with a constant guard band (or guard subband) because UL / DL interference occurs between adjacent channels when transmitting in the immediate subband.
  • the terminal may transmit as shown in FIG. 13 without having a guard band. This is because the AP does not need to consider UL / DL interference between adjacent channels since it is not transmitting.
  • the terminal may inform whether or not to use the guard band when transmitting to the FDR in the remaining subband. If the decoding performance of the AP In good cases, you may not need a guardband.
  • Guardband size when the terminal needs to transmit the guardband to adjust the size. This may depend on the performance of the AP and the subband size of the PPDU being transmitted.
  • the terminal / STA may determine whether to apply the guard band in the FDR operation through the information of the PLCP header. To this end, as shown in FIG. 12 and FIG. 13, it is preferable that the terminal / STA does not start data transmission to the AP until the reception / decoding of PLCP header information of the PPDU of the AP is completed. After completing the reception of the PLCP header information, the terminal / STA may initiate data transmission to the AP through a contention step in the corresponding subband as indicated by "backof f".
  • FIG. 14 illustrates a method in which a terminal transmits data to an AP without using a guard band in the situation as shown in FIG. 13.
  • MCS 1 when the transmission power when the guard band is not used, PI, MCS level is called MCS 1, and the transmission power when using the gait band is P2, MCS level is MCS 2, (1) PI ⁇ P2, or
  • the AP transmits the RTS framing first and then the AP responds to the CTS is also possible to determine the appropriate MCS after measuring the interference by the RTS.
  • the size of the guard band can also be known through the CTS.
  • 15 is a diagram for explaining an apparatus for performing data transmission by applying the FDR as described above.
  • the wireless device 800 of FIG. 15 may correspond to a particular STA ⁇ of the above description and the wireless device 850 may correspond to the AP of the above description.
  • the STA may include a processor 810, a memory 820, a transceiver 830, and the AP 850 may include a processor 860, a memory 870, and a transceiver 880.
  • the transceivers 830 and 880 may transmit / receive radio signals and may be executed in a physical layer such as IEEE 802.11 / 3GPP.
  • the processors 810 and 860 are executed at the physical layer and / or MAC layer, and are connected to the transceivers 830 and 880. Processors 810 and 860 may perform the interference control procedure mentioned above.
  • Processors 810 and 860 and / or transceivers 830 and 880 may include a specific integrated circuit (appl icat ion—spec i c ic integrated ci rcui t, ASIC), other chipset, logic circuit and / or data processor. It may include.
  • the memory 820 and 870 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage unit.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory card
  • the method described above can be executed as a module (eg, a process, a function) that performs the functions described above.
  • the modules may be stored in memory 820, 870 and executed by processor 810, 860.
  • the memories 820 and 870 may be disposed inside or outside the processes 810 and 860 and may be connected to the processes 810 and 860 by well-known means.
  • the present invention as described above has been described assuming that it is applied to the IEEE 802.11-based wireless LAN system, but is not limited thereto. Invention wireless The same applies to various wireless systems that require interference control between devices.

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

Abstract

La présente invention porte sur un procédé de transmission de FDR dans un dispositif et système LAN sans fil s'y rapportant. Dans un système LAN sans fil, une station (STA) est configurée de manière à simultanément transmettre des données par l'intermédiaire d'une sous-bande différente à l'intérieur d'un canal à travers lequel un PA transmet des données, sur la base des informations d'en-tête des données étant transmises par le PA, l'utilisation ou la non-utilisation d'une sous-bande séparée par autant de bande de garde prédéterminée à partir de la sous-bande utilisée par le PA pour la transmission des données peut être déterminée.
PCT/KR2015/005937 2014-12-04 2015-06-12 Procédé de transmission de fdr dans un dispositif et système lan sans fil s'y rapportant WO2016088958A1 (fr)

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KR1020177012641A KR101931949B1 (ko) 2014-12-04 2015-06-12 무선랜 시스템에서 fdr 전송 기법 및 이를 위한 장치

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US201462087791P 2014-12-04 2014-12-04
US62/087,791 2014-12-04

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CN112075122B (zh) * 2018-05-03 2024-02-23 交互数字专利控股公司 用于具有全双工无线电的无线局域网(wlan)的信道接入方案

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US20140254530A1 (en) * 2011-09-25 2014-09-11 Lg Electronics Inc. User equipment and method for transmitting uplink signal, and base station and method for receiving uplink signal
US20130163441A1 (en) * 2011-12-23 2013-06-27 Broadcom Corporation Decoupled downlink and uplink
WO2013122377A1 (fr) * 2012-02-14 2013-08-22 엘지전자 주식회사 Procédé de transmission d'unités de données dans des systèmes de réseau local sans fil et appareil de mise en œuvre de ce procédé
WO2013157772A1 (fr) * 2012-04-15 2013-10-24 엘지전자 주식회사 Procédé de détermination de ressources de liaison montante, procédé de transmission de signal de commande de liaison montante l'utilisant et appareil associé

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