WO2006025680A1 - Procede de transmission de donnees dans un reseau local sans fil, dispositif de point d'acces et dispositif de station - Google Patents

Procede de transmission de donnees dans un reseau local sans fil, dispositif de point d'acces et dispositif de station Download PDF

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Publication number
WO2006025680A1
WO2006025680A1 PCT/KR2005/002861 KR2005002861W WO2006025680A1 WO 2006025680 A1 WO2006025680 A1 WO 2006025680A1 KR 2005002861 W KR2005002861 W KR 2005002861W WO 2006025680 A1 WO2006025680 A1 WO 2006025680A1
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WO
WIPO (PCT)
Prior art keywords
stations
contention
sub
period
free period
Prior art date
Application number
PCT/KR2005/002861
Other languages
English (en)
Inventor
Chang-Yeul Kwon
Chil-Youl Yang
Rosdahl Jon
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020040072821A external-priority patent/KR100608006B1/ko
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Publication of WO2006025680A1 publication Critical patent/WO2006025680A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/02—Hybrid access
    • 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 invention relates to a method for transmitting data through a wireless local area network (WLAN), an access point device and a station device.
  • WLAN wireless local area network
  • a multiple- input-multiple-output (MIMO) technology using multiple transmission and reception antennas is recognized as one of the candidates that can satisfy this development demand.
  • the multiple transmission and reception antennas technology includes a technique enabling high speed data transmission without increasing the bandwidth of a system by transmitting different data units at the same time by using multiple antennas for a transmitter and a receiver, and a technique obtaining transmission diversity by transmitting the same data to multiple transmission antennas.
  • the MIMO technology is one of the adaptive array antenna technologies using a plurality of antennas to electrically control directivity, and narrows the directivity on a beam to form a plurality of independent transmission channels and increases the transmission speed as many times as the number of antennas. At this time, the frequency and transmission timing used by each antenna is identical. Also, by using multiple channels, due to the development of the technology enabling a bandwidth twice or more wider than the existing bandwidth, the transmission capability has been greatly increased.
  • the IEEE 802.1 la/g standard defines three separate 20 MHz channels and the orthogonal frequency division multiplexing (OFDM).
  • WLAN using channel bonding combines two of the carrier channels into one 40 MHz channel in order to increase the throughput. That is, the WLAN channel bonding is based on two neighboring IEEE 802.11 and OFDM channels to achieve a throughput of a large amount of data.
  • the channel bonding doubles the size of a fast Fourier transform (FFT) and enables the FFT to multiplex twice the data amount. Except that 128 point FFT is implemented, the channel bonding follows all the processing process of the original IEEE 802.11 a/g standard. Also, in order to maintain a standard 802.11 symbol interval through a 40 MHz channel that is a bandwidth twice wider than that of the standard 802.11 channel, the sampling and clock rates should be doubled.
  • FFT fast Fourier transform
  • legacy stations complying with the existing 802.11 standard and stations following the introduction of the new technologies can be mixedly disposed in one basic service set (BSS).
  • BSS basic service set
  • FlG. 1 is a diagram showing a BSS status in which single-input-single-output
  • SISO SISO stations and MIMO stations are mixedly disposed according to the related art technology.
  • the BSS can include two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120, two SISO stations 110 and 120,
  • the SISO station represents a legacy station complying with the conventional IEEE 802.11 standard, and the MIMO station and the channel bonding station can be regarded as high throughput stations.
  • a media access control (MAC) mechanism is formed with a distributed coordination function (DCF) period in which a plurality of stations are trying to access channels in a carrier sense multiple access/collision avoidance (CSMA/CA) method.
  • DCF distributed coordination function
  • CSMA/CA carrier sense multiple access/collision avoidance
  • PCF point co ⁇ ordination function
  • AP access point
  • PC embedded point coordinator
  • FEC forwarding equivalence classes
  • an IEEE 802.11 WLAN a wireless medium is shared, and communication is performed between stations. Access to this wireless medium is controlled through a 'co ⁇ ordination function' in a LAN module.
  • the IEEE 802.11 WLAN supports two co ⁇ ordination functions, the DCF and the PCF. That is, as shown in FlG. 2, the IEEE 802.11 WLAN has a form in which the PCF 220 operates on the DCF 210.
  • the DCF uses the CSMA/CA that is a mechanism similar to the carrier sense multiple access/collision detection (CSMA/CD), which is an access method used in the IEEE 802.3 WLAN.
  • the PCF uses a method in which a special station referred to as a point coordinator (PC) controls medium access in a centralized method.
  • the DCF is a contention-based service, performing a backoff mechanism in order to effectively share a given channel while preventing collision between stations to the greatest degree.
  • a contention free period (CFP) 300 a PC allocates a channel use right to stations in order not through channel contention, but through polling. Then, if a contention period (CP) begins, a use right is obtained through channel contention with backoff again.
  • CCP contention free period
  • the CFP begins by the PC broadcasting a beacon frame 302 and ends by transmitting a CF-End frame 311.
  • a value referred to as a network allocation vector (NAV) 330 is included.
  • the NAV plays a role to make stations that are participating in a current network and desire to use a channel follow the control of the PC, by making the stations temporarily stop independent operations during only the CFP period. If the CFP period ends, a CP operates again according to the DCF rule.
  • a PC broadcasts a beacon frame 302 so as to inform all stations under control of the PC of a CFP period 300.
  • the stations receiving the beacon 302 stop all individual operations and only a station having an address specified in a poll frame transmitted by the PC after the beacon frame has a channel access right and is enabled to transmit data.
  • the CFP period 300 means that the DCF function in which a channel access right is obtained through contention is temporarily stopped and a mechanism for channel access through polling by a PC begins.
  • the PC After the beacon frame, the PC performs polling in order based on a predefined polling list. If there is data to be transmitted to a station that is in its turn for polling, the PC loads data on a polling frame 304 and transmits to the station, and if the PC has no data to transmit, only the polling frame 304 is transmitted to the station so that the station can have an opportunity to transmit data. Then, the station receiving this polling frame transmits an ACK frame 306, as a reception confirmation response, to the PC, after SIFS 305 that is a time to prepare a response elapses. As in the polling frame, if there is data to transmit, the station loads the data in the ACK frame 306 and transmits the data, and if there is no data to transmit, the station transmits only the ACK frame 306 to the PC.
  • the present invention provides a data transmission method in a WLAN, an access point device and a station device by which safe communication can be guaranteed on the WLAN in which high throughput stations using the MIMO technology and channel bonding technology and legacy stations complying with 802.1 Ia, b, and g are mixedly disposed.
  • the present invention by providing a period in which only HT stations can obtain a channel use right through contention, only to HT stations coexisting with legacy stations on a WLAN, collision with legacy stations can be prevented such that reliability of data transmission can be improved. Furthermore, when there are no objects of polling in a contention free period, the period, in which the HT stations can obtain the channel use right though contention, is made to begin earlier such that without wasting the channel use period the channel can be used flexibly.
  • FIG. 1 is a diagram showing a BSS state in which SISO stations and MIMO stations are mixedly disposed according to related art technology
  • FIG. 2 is a diagram showing the structure of a PCF built on a DCF according to related art technology
  • FIG. 3 is a diagram for explaining data items transmitted and received in the PCF according to related art technology
  • FIG. 4 is a reference diagram explaining allocation of a contention free period according to an exemplary embodiment of the present invention.
  • FIG. 5 is a diagram of the data structure of a beacon frame according to an exemplary embodiment of the present invention.
  • FIG. 6 is a diagram of the data structure of a CF-END frame used in an exemplary embodiment of the present invention.
  • FIG. 7 is a schematic diagram of the structure of an access point device according to an exemplary embodiment of the present invention.
  • FIG. 8 is a schematic diagram of the structure of anHT station device according to an exemplary embodiment of the present invention.
  • FlG. 9 is a flowchart showing a process of transmitting and receiving a frame in an access point device according toan exemplary embodiment of the present invention.
  • FlG. 10 is a flowchart showing a process of transmitting and receiving a frame in an HT station device according to an exemplary embodiment of the present invention.
  • a data transmission method for transmitting data from an access point on a WLAN including: allocating a sub-contention free period in which legacy stations (in exemplary em ⁇ bodiments, 802.11 based legacy stations) and high throughput (HT) stations with multiple antennas obtain a channel use right through polling, and an HT contention period in which the HT stations obtain a channel use right through contention, in a contention free period where a channel use right is obtained through polling; and transmitting a sub-contention free period termination message indicating the termination of the sub-contention free period, to the HT stations before the sub- contention free period expires.
  • legacy stations in exemplary em ⁇ bodiments, 802.11 based legacy stations
  • HT high throughput
  • the allocating of the sub-contention free period and the HT contention period may include: transmitting a beacon frame including information indicating the length of the contention free period and information indicating the length of the HT contention period, to the legacy stations and the HT stations.
  • the transmitting of the sub-contention free period termination message may include transmitting a CF-END control frame in a modulation method or at a high transmission rate interpretable by the HT stations.
  • the HT stations may include multiple input multiple output (MEMO) stations and stations using channel bonding and having a single antenna.
  • MEMO multiple input multiple output
  • a data transmission method for transmitting data from a station on a WLAN including: receiving information on a CFP in which a channel use right is obtained through polling and information on an HT contention period in which HT stations obtain a channel use right through contention, from an access point; allocating a Sub-CFP in which 802.11 based legacy stations and HT stations having multiple antennas are polled and obtain a channel use right with a length of (the length of the contention free period - the length of the HT contention period); and if a sub-contention free period termination message indicating the termination of the sub-contention free period is received from the access point before the sub-contention free period expires, obtaining a channel use right through contention among the HT stations.
  • the receiving of the information may include: receiving a beacon frame including the information on the contention free period and the HT contention period from the access point.
  • the allocating the sub-contention free period may include setting (the length of the contention free period - the length of the HT contention period) as a NAV.
  • the obtaining of the channel use right may include receiving a CF-END control frame in a modulation method or at a high transmission rate interpretable by the HT stations from the access point.
  • the HT stations may include MIMO based stations and stations using channel bonding and having a single antenna.
  • an access point on a wireless LAN including: an HT contention period allocation unit allocating a Sub-CFP in which 802.11 based legacy stations and HT stations with multiple antennas obtain a channel use right through polling, and an HT contention period in which the HT stations obtain a channel use right through contention, in a CFP where a channel use right is obtained through polling; and a sub-contention free period adjusting unit transmitting a Sub-CFP termination message indicating the termination of the sub-contention free period, to the HT stations before the Sub-CFP period expires.
  • a station on a wireless LAN including: a frame reception unit receiving information on a CFP in which a channel use right is obtained through polling and information on an HT contention period in which HT stations obtain a channel use right through contention, from an access point; a sub-contention free period allocation unit allocating a Sub-CFP in which 802.11 based legacy stations and HT stations having multiple antennas are polled and obtain a channel use right with a length of (the length of the contention free period - the length of the HT contention period); and a contention performing unit obtaining a channel use right through contention among the HT stations if a Sub-CFP termination message indicating the termination of the Sub-CFP is received from the access point before the sub- contention free period expires.
  • a contention free repetition interval 400 is formed with a contention free period 410 and a contention period 420.
  • the contention period 420 is a period in which legacy station and HT stations are obtaining a channel use right through contention all together. Though only stations using the MEMO technology and the channel bonding technology are mentioned above as HT stations, the HT stations are not limited to these and may also include those stations complying with a technology to be developed, for example, equivalent to the MIMO or channel bonding.
  • a contention free period 410 is a period in which stations are obtaining a channel use right by the polling operation of an AP according to the related art technology, but the contention free period 410 according to the present invention is formed with a sub- contention free period 411 and an HT contention period 412.
  • the sub-contention free period 411 indicates a period in which legacy stations and
  • the HT contention period 412 indicates a contention period for exclusive use by HT stations in which only HT stations are obtaining a channel use right through contention.
  • the HT AP transmits periodically a management frame referred to as a beacon
  • predefined time interval information defining a contention free period and a contention period is loaded.
  • This contention free period is again divided into an HT contention period for communication between HT stations and the remaining period that is a contention free period, excluding this HT contention period.
  • the timing control for this is performed first by the HT AP capable of communicating both an HT frame and a legacy frame, loading CF parameter information element including MaxCFPDuration and BSS status information element including HTCPDuration information in a beacon and transmitting it.
  • the HT stations and legacy stations receiving this beacon set a NAV value such that transmission is held back during MaxCFPDuration. Since the legacy stations can recognize only the formats complying with the conventional 802.11 frame, the legacy stations extract the MaxCFPDuration value included in the beacon frame and set this as a NAV 470.
  • the HT stations can detect the HTCPDuration field included in the beacon frame set according to the present invention, and therefore sets (MaxCFPDuration - HTCPDuration) as a NAV 460.
  • the HT AP controls transmission and reception and after this period (MaxCFPDuration - HTCPDuration) only HT stations begin contention and transmission.
  • the period can be finished by the AP transmitting a CF-end control frame that can be recognized by the HT stations. If this CF-end (HT compliant) frame cannot be received, after (MaxCFPDuration - HTCPDuration), the NAV in each HT expires such that the HT CP begins.
  • the HT CP period is reset by the AP transmitting a CF-end (legacy compliant, for example, IEEE 802.1 Ia) frame, and after that a contention period begins.
  • FIG. 5 is a diagram of the data structure of a beacon frame according to the present invention.
  • the beacon frame 500 that is one of management frames complying with the IEEE 802.11 standard includes a frame control field 510, a d uration field 520, a destination address (DA) field 530, a source address (SA) field 540, a BSSID field 550, a sequence control field 560, a frame body field 570, and an FCS field 580.
  • a field loading MaxCFPDuration and HTCPDuration form the frame body field 670 which includes one or more information elements.
  • Other fields are the same as in the related art technology and therefore further explanation thereof will be omitted.
  • the frame body 570 is formed with one or more information elements.
  • the frame body 570 includes a CF parameter information element field 571 containing a set of parameters required to support the PCF and a BSS status information element field 575 containing a set of parameters required to support a BSS defined according to the present invention.
  • the CF parameter information element 571 includes a CF parameter set ID 572 field, a length field 573, and a MaxCFPDuration field 574.
  • the CF parameter set ID 572 is the identifier of a CF parameter information element, and the length 573 indicates the length of information.
  • the MaxCFPDuration 574 is a value used to set a NAV by legacy station and HT stations. The legacy stations set this value directly as the NAV, and the HT stations use this value together with HTCPDuration 578 (discussed below) to set as the NAV.
  • the BSS status information element 575 includes a BSS status information ID field
  • the BSS status information ID 576 is the identifier of a BSS status information element and the length 577 indicates the length of information.
  • the HTCPDuration 578 is a value to be used together with the CFPMaxDuration by HT stations to set the NAV.
  • FIG. 6 is a diagram of the data structure of a CF-END frame used in an exemplary embodiment of the present invention.
  • the CF-END frame 600 includes a frame control field 610, a duration field 620, an RA 630, a BSSID 640, and an FCS 650.
  • the contents of each field is the same as defined according to the related art technology, and in the present invention, in order to transmit this CF-END frame 600 only to HT stations, this CF- END frame 600 is generated by using a modulation method that can be interpreted by the HT stations and transmitted, or is transmitted as a data transmission object that can be obtained by only the HT stations.
  • FIG. 7 is a schematic diagram of the structure of an access point device according to the present invention.
  • the access point device 700 includes a frame transmission and reception unit 710, a beacon frame generation unit 720, a polling unit 730, a CF-END frame generation unit 740, and a contention performing unit 750.
  • the frame transmission and reception unit 710 transmits and received frames, that is, a management frame, a control frame, a data frame, etc., between an AP and stations.
  • the beacon frame generation unit 720 generates a beacon frame that is periodically transmitted to stations in each contention free repetition interval.
  • the beacon frame generation unit 720 generates a beacon frame including MaxCFPDuration information and HTCPDuration information as shown in FIG. 5.
  • the polling unit 730 performs polling of legacy stations and HT stations during the
  • the polling unit 730 informs the CF-END frame generation unit 740 of this decision.
  • the CF-END frame generation unit 740 if a signal from the polling unit 730 or the contention performing unit 750 is received, generates a CF-END control frame. If a signal from the polling unit 730 is received, the CF-END frame generation unit 740 controls in order to inform the HT stations of the end of the sub-contention free period such that the CF-END control frame is generated in a modulation method that can be interpreted by the HT stations, or this CF-END control frame is transmitted in a data transmission rate that can be obtained by the HT stations.
  • the CF-END frame generation unit 740 transmits the CF-END control frame in a modulation method and a data transmission rate that can be interpreted and obtained by the legacy stations.
  • the data frame that can be interpreted by the legacy stations can be interpreted by the HT stations.
  • the contention performing unit 750 controls such that during the HT CP period, contention is performed by HT stations and during the contention period, contention is performed by legacy stations and HT stations.
  • the AP also participates in this contention and performs operations for transmitting and receiving a data frame.
  • FlG. 8 is a schematic diagram of the structure of an HT station device according to the present invention.
  • the HT station device 800 includes a frame transmission/ reception unit 810, a beacon frame detection unit 820, a NAV setting unit 830, a po lling unit 840, a CF-END frame detection unit 850, and a contention performing unit 860.
  • the frame transmission/reception unit 810 receives a management frame, a control frame, a data frame, etc., transmitted by an AP, and transmits a data frame.
  • the beacon frame detection unit 820 detects a beacon frame from an AP received through the frame transmission/reception unit 810, and from this, extracts MaxCF- PDuration information and HTCPDuration information and transmits to the NAV setting unit 830.
  • the NAV setting unit 830 calculates (MaxCFPDuration - HTCPDuration), sets this as a NAV, and transmits the set NAV value to the polling unit 840. Also, the NAV setting unit 830, if a signal from the CF-END frame detection unit 850 is received, resets the NAV as expired, and transmits a signal indicating that the NAV has expired, to the contention performing unit 860.
  • the polling unit 840 does not contend during the set NAV period, and if a polling signal from an AP is received, transmits an ACK signal to this and performs transmission and reception of a data frame.
  • the CF-END frame detection unit 850 detects a CF-END frame from an AP received through the frame transmission and reception unit 810. Since the CF-END frame indicates the end of a sub-contention free period, the CF-END frame detection unit 850 transmits a signal to the NAV setting unit 830 such that the NAV setting unit 830 can reset the NAV as expired.
  • the contention performing unit 860 if a signal indicating that the NAV expired is received from the NAV setting unit 830, learns that the sub-contention free period has ended, and obtains a channel selection right through contention. At this time, since in the HT contention period following the ended sub-contention free period, only HT stations contend, transmission of data can be guaranteed more stably.
  • FlG. 9 is a flowchart showing a process of transmitting and receiving a frame in an access point device according to the present invention.
  • an AP transmits a beacon frame, including MaxCFPDuration and HTCPDuration information, to stations in operation 900.
  • Both legacy stations and HT stations receive this beacon frame. However, legacy stations detect only MaxCFPDuration that can be recognized by the legacy stations, from the beacon frame and set this as a NAV, while HT stations detect both MaxCF ⁇ PDuration and HTCPDuration that can be recognized by the HT stations, and set (MaxCFPDuration - HTCPDuration) as a NAV.
  • the AP performs polling of the legacy stations and HT stations and transmits a data frame in operation 910.
  • the AP transmits a CF-END control frame indicating that the sub-contention free period ends, to HT stations in operation 920.
  • a CF-END control frame is generated in a modulation method that can be interpreted only by the HT stations and is transmitted, or a CF-END control frame is transmitted at a higher transmission rate. Since the HT stations can identify this CF-END frame, the HT stations, if this frame is received, understand that the NAV has expired, and participate in contention to obtain a channel use right. Since the legacy stations cannot identify this CF-END frame, the sub-contention free period is maintained without change. Thus, by the AP transmitting a message to end the sub-contention free period even before the expiration of the sub-contention free period, a period in which HT stations can contend is made to begin beforehand such that waste of channels can be prevented.
  • the AP obtains a channel use right through contention and transmits a data frame in operation 930.
  • the AP transmits a CF-END control frame indicating that the sub-contention free period ends, to the HT stations and the legacy stations if there are no stations trying to obtain a channel use right or there is rare traffic even before the expiration of the MaxCFPDuration period in operation 940.
  • the HT stations since the HT stations have already been in the contention period, the HT stations would try to obtain a channel use right through contention in the same manner, and the legacy stations that were in the contention free period understand that the NAV has expired and begin to participate in the contention.
  • a next AP obtains a channel use right through contention during a contention period, that is, a period in which the HT stations and legacy stations can contend, and transmits a data frame in operation 950.
  • FlG. 10 is a flowchart showing a process of transmitting and receiving a frame in an HT station device according to the present invention. Referring to FlG. 10, the HT station calculates (MaxCFPDuration - HTCPDuration) from MaxCFPDuration and HTCPDuration contained in a beacon received from an AP and sets as an NAV in operation 1000.
  • the HT station responds to the polling from the
  • AP transmits a data frame, and receives a data frame in operation 1010.
  • the HT station resets the NAV as expired, and by understanding that the sub-contention free period ends and a contention period begins, transmits a data frame through contention in operation 1020.
  • the data transmission and reception method as described above can also be embodied as computer readable codes on a computer readable recording medium.
  • the computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the Internet).
  • the computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. Also, functional programs, codes, and code segments for accomplishing the present invention can be easily construed by programmers skilled in the art to which the present invention pertains.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention a trait à un procédé de transmission de données dans un réseau local sans fil, un dispositif de point d'accès et un dispositif de station. Le procédé de transmission de données pour la transmission de données depuis un point d'accès sur un réseau local sans fil comprend l'allocation d'une période exempte de sous-conflits dans laquelle des stations existantes basées sur 802.11 et des stations haut débit avec plusieurs antennes obtiennent un droit d'utilisation de voie grâce à une sélection, et une période de conflit de stations haut débit durant laquelle les stations haut débit peuvent obtenir le droit d'utilisation par conflit. Selon le procédé et des dispositifs, lorsqu'il n'y a aucun objet de sélection dans une période exempte de conflit, la période, dans laquelle les stations haut débit peuvent obtenir le droit d'utilisation de voie par conflit, est amenée à débuter plus tôt de sorte que sans gaspillage de période d'utilisation de voie, la voie peut être utilisée de manière flexible.
PCT/KR2005/002861 2004-08-31 2005-08-30 Procede de transmission de donnees dans un reseau local sans fil, dispositif de point d'acces et dispositif de station WO2006025680A1 (fr)

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US60552904P 2004-08-31 2004-08-31
US60/605,529 2004-08-31
KR10-2004-0072821 2004-09-11
KR1020040072821A KR100608006B1 (ko) 2004-08-31 2004-09-11 무선랜상에서 데이터를 전송하는 방법, 액세스 포인트장치 및 스테이션 장치

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EP1881647A1 (fr) * 2005-05-10 2008-01-23 Mitsubishi Electric Corporation Dispositif de controle de terminal et systeme lan sans fil
WO2010095793A1 (fr) * 2009-02-18 2010-08-26 Lg Electronics Inc. Procede d'acces au canal pour un systeme de reseau d'acces local sans fil a tres haut debit
WO2011025201A2 (fr) * 2009-08-24 2011-03-03 한국전자통신연구원 Dispositif et procédé de communication dans un système de communication sans fil haute capacité
WO2014061926A1 (fr) * 2012-10-18 2014-04-24 Lg Electronics Inc. Procédé et appareil d'accès par voie dans un système sans fil
EP2844015A4 (fr) * 2012-04-28 2015-06-24 Lg Electronics Inc Procédé et appareil d'accès au canal dans un système wlan

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WO2004051933A2 (fr) * 2002-12-02 2004-06-17 Agere Systems Inc. Reduction de l'interference entre differents systemes de communication partageant un support de transmission sans fil commun

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US20030128684A1 (en) * 2002-01-09 2003-07-10 Koninklijke Philips Electronics N.V. Coexistence of modulation schemes in a WLAN
WO2004051933A2 (fr) * 2002-12-02 2004-06-17 Agere Systems Inc. Reduction de l'interference entre differents systemes de communication partageant un support de transmission sans fil commun

Cited By (23)

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