WO2016060479A1 - 무선 통신 방법 및 무선 통신 단말 - Google Patents
무선 통신 방법 및 무선 통신 단말 Download PDFInfo
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- WO2016060479A1 WO2016060479A1 PCT/KR2015/010853 KR2015010853W WO2016060479A1 WO 2016060479 A1 WO2016060479 A1 WO 2016060479A1 KR 2015010853 W KR2015010853 W KR 2015010853W WO 2016060479 A1 WO2016060479 A1 WO 2016060479A1
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- communication terminal
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- 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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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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
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0031—Multiple signaling transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
- H04L1/0063—Single parity check
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0079—Formats for control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- 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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
- H04L27/26132—Structure of the reference signals using repetition
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- 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 wireless communication method and a wireless communication terminal for establishing a broadband link. More specifically, the present invention relates to a wireless communication method and a wireless communication terminal for increasing data communication bandwidth of a terminal to increase data communication efficiency.
- Wireless LAN technology is a technology that enables wireless devices such as smart phones, smart pads, laptop computers, portable multimedia players, and embedded devices to wirelessly access the Internet at home, enterprise, or specific service area based on wireless communication technology at short range. to be.
- IEEE 802.11 Since IEEE (Institute of Electrical and Electronics Engineers) 802.11 supports the initial WLAN technology using the 2.4 GHz frequency, various standards of the technology are being put into practice or being developed.
- IEEE 802.11b supports communication speeds up to 11Mbps while using frequencies in the 2.4GHz band.
- IEEE 802.11a commercialized after IEEE 802.11b, reduces the impact of interference compared to the frequency of the congested 2.4 GHz band by using the frequency of the 5 GHz band instead of the 2.4 GHz band. Up to 54Mbps.
- IEEE 802.11a has a shorter communication distance than IEEE 802.11b.
- IEEE 802.11g like IEEE 802.11b, uses a frequency of 2.4 GHz band to realize a communication speed of up to 54 Mbps and satisfies backward compatibility, which has received considerable attention. Is in the lead.
- IEEE 802.11n is a technical standard established to overcome the limitation of communication speed, which has been pointed out as a weak point in WLAN. IEEE 802.11n aims to increase the speed and reliability of networks and to extend the operating range of wireless networks. More specifically, IEEE 802.11n supports high throughput (HT) with data throughput of up to 540 Mbps and also uses multiple antennas at both the transmitter and receiver to minimize transmission errors and optimize data rates. It is based on Multiple Inputs and Multiple Outputs (MIMO) technology. In addition, the specification may use a coding scheme that transmits multiple duplicate copies to increase data reliability.
- MIMO Multiple Inputs and Multiple Outputs
- IEEE 802.11ac supports a wide bandwidth (80MHz to 160MHz) at 5GHz frequency.
- the IEEE 802.11ac standard is defined only in the 5GHz band, but for backwards compatibility with existing 2.4GHz band products, early 11ac chipsets will also support operation in the 2.4GHz band. Theoretically, this specification allows multiple stations to have a minimum WLAN speed of 1 Gbps and a maximum single link speed of at least 500 Mbps.
- IEEE 802.11ad is a method of transmitting data using a 60 GHz band instead of the existing 2.4 GHz / 5 GHz.
- IEEE 802.11ad is a transmission standard that uses beamforming technology to provide speeds of up to 7Gbps, and is suitable for streaming high bitrate video such as large amounts of data or uncompressed HD video.
- the 60 GHz frequency band is difficult to pass through obstacles, and thus can be used only between devices in a short space.
- next generation wireless LAN standard after 802.11ac and 802.11ad, a discussion for providing a high-efficiency and high-performance wireless LAN communication technology in a high-density environment continues. That is, in a next generation WLAN environment, high frequency efficiency communication should be provided indoors / outdoors in the presence of a high density station and an access point (AP), and various technologies are required to implement this.
- AP access point
- One embodiment of the present invention is to provide an efficient wireless communication method and a wireless communication terminal.
- an embodiment of the present invention is to provide a wireless communication method and a wireless communication terminal that any one of the wireless communication terminal to transmit data to a plurality of wireless communication terminal at the same time.
- Wireless communication terminal includes a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the wireless communication terminal, wherein the transceiver unit acquires a signaling field from a physical frame including data transmitted from a base wireless communication terminal to each of a plurality of wireless communication terminals including the wireless communication terminal. Receive data transmitted from the physical frame to the wireless communication terminal based on the signaling field, and the signaling field signals information about the plurality of wireless communication terminals, The communication terminal is any one of wireless communication terminals different from the plurality of wireless communication terminals.
- the plurality of wireless communication terminals may be divided into a plurality of groups, and the signaling field may include independent lower fields for each of the plurality of groups.
- the signaling field may further include a field indicating the number of the plurality of groups.
- the signaling field may include a plurality of fields indicating an identifier for identifying each of the plurality of groups.
- the signaling field may include information about a frequency band allocated to each of the plurality of wireless communication terminals.
- the bandwidth of the sub-frequency band allocated to each of the plurality of wireless communication terminals may be equal.
- the signaling field may include a field indicating whether to use orthogonal frequency-division multiple access (OFDMA) transmission.
- OFDMA orthogonal frequency-division multiple access
- the signaling field may include a field indicating whether a sub-frequency band allocated to each of the plurality of wireless communication terminals is a continuous frequency band.
- the information on the sub-frequency band may include information on sub-frequency bandwidth, information indicating a number of space-time streams, information indicating whether convolutional coding has been applied to data for each of the plurality of wireless communication terminals, And information indicating whether additional OFDM symbols are required by applying low-density parity-check code (LDPC) coding to data for each of the plurality of wireless communication terminals.
- LDPC low-density parity-check code
- the frequency band allocated to the plurality of wireless communication terminals may include a main channel of a frequency band usable by the base wireless communication terminal.
- the base wireless communication terminal uses a frequency band having a bandwidth greater than or equal to the minimum unit frequency bandwidth, and the minimum unit frequency bandwidth in which different information is transmitted in units of the minimum unit frequency bandwidth is a frequency that can be used by the base terminal. Represents the minimum bandwidth of the band.
- Another base wireless communication terminal includes a transceiver for transmitting and receiving a wireless signal; And a processor configured to control an operation of the wireless communication terminal, wherein the transceiver transmits a signaling field for signaling data to be transmitted to each of the plurality of wireless communication terminals and information about the plurality of wireless communication terminals to a plurality of wireless communication terminals. Transmitting a physical frame, wherein the base wireless communication terminal is any one of wireless communication terminals different from the plurality of wireless communication terminals.
- the plurality of wireless communication terminals may be divided into a plurality of groups, and the signaling field may include independent lower fields for each of the plurality of groups.
- the signaling field may further include a field indicating the number of the plurality of groups.
- the signaling field may include a plurality of fields indicating an identifier for identifying each of the plurality of groups.
- the signaling field may include information about a frequency band allocated to each of the plurality of wireless communication terminals.
- the bandwidth of the sub-frequency band allocated to each of the plurality of wireless communication terminals may be equal.
- the signaling field may include a field indicating whether to use orthogonal frequency-division multiple access (OFDMA) transmission.
- OFDMA orthogonal frequency-division multiple access
- the signaling field may include a field indicating whether a sub-frequency band allocated to each of the plurality of wireless communication terminals is a continuous frequency band.
- a method of operating a wireless communication terminal includes the steps of acquiring a signaling field from a physical frame including data transmitted from a base wireless communication terminal to each of a plurality of wireless communication terminals including the wireless communication terminal; And receiving data transmitted from the physical frame to the wireless communication terminal based on the signaling field, wherein the signaling field signals information about the plurality of wireless communication terminals,
- the base wireless communication terminal is any one of wireless communication terminals different from the plurality of wireless communication terminals.
- One embodiment of the present invention provides an efficient wireless communication method and a wireless communication terminal.
- an embodiment of the present invention provides a wireless communication method and a wireless communication terminal in which one wireless communication terminal simultaneously transmits data to a plurality of wireless communication terminals.
- FIG. 1 illustrates a WLAN system according to an embodiment of the present invention.
- FIG. 2 shows a WLAN system according to another embodiment of the present invention.
- FIG. 3 is a block diagram showing a configuration of a station according to an embodiment of the present invention.
- FIG. 4 is a block diagram illustrating a configuration of an access point according to an embodiment of the present invention.
- FIG. 5 schematically shows a process of establishing a link with an access point by a station according to an embodiment of the present invention.
- FIG. 6 shows a channel allocated to a wireless communication terminal in the 2.4 GHz band according to an embodiment of the present invention.
- FIG 7 shows a channel allocated to a wireless communication terminal in the 5GHz band according to an embodiment of the present invention.
- FIG 8 illustrates a principle in which one wireless communication terminal allocates a frequency band having a minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an embodiment of the present invention.
- FIG. 9 shows that one wireless communication terminal allocates a frequency band having a minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an embodiment of the present invention.
- FIG. 10 shows that one wireless communication terminal allocates a frequency band having a bandwidth twice the minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an exemplary embodiment.
- FIG. 11 shows that a wireless communication terminal allocates a frequency band having a bandwidth four times the minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an exemplary embodiment.
- FIG. 12 shows that one wireless communication terminal allocates a frequency band having a bandwidth of eight times the minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an exemplary embodiment.
- FIG. 13 is a diagram for allocating a contiguous sub-band or a non-contiguous sub-band included in a frequency band to a plurality of stations by one wireless communication terminal according to an exemplary embodiment of the present invention. Shows.
- 15 shows that one wireless communication terminal allocates a frequency band to two wireless communication terminals according to an embodiment of the present invention.
- FIG. 16 shows that one wireless communication terminal allocates a primary channel having a minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an embodiment of the present disclosure.
- FIG. 17 shows that a wireless communication terminal according to an embodiment of the present invention has a bandwidth that is twice the minimum unit frequency bandwidth and allocates a frequency band including a main channel to the plurality of wireless communication terminals.
- FIG. 18 shows that one wireless communication terminal allocates a frequency band having a bandwidth that is four times the minimum unit frequency bandwidth to a plurality of wireless communication terminals, according to an exemplary embodiment.
- FIG. 19 shows that one wireless communication terminal allocates a frequency band having a bandwidth that is eight times the minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an exemplary embodiment.
- FIG. 20 illustrates a format of a physical frame according to an embodiment of the present invention.
- FIG. 21 shows the format of a SIG-A field according to an embodiment of the present invention.
- FIG. 22 shows the format of a SIG-A field according to another embodiment of the present invention.
- FIG. 23 is a view illustrating a format of a SIG-A field including independent subfields for each group including a plurality of wireless communication terminals according to another embodiment of the present invention.
- FIG. 24 illustrates a configuration of a physical frame including a SIG-A field according to an embodiment of the present invention.
- 25 illustrates a configuration of a physical frame including a SIG-A field according to another embodiment of the present invention.
- FIG. 26 illustrates a configuration of a physical frame including a SIG-A field according to another embodiment of the present invention.
- 27 is a ladder diagram illustrating operations of a first wireless communication terminal and a second wireless communication terminal according to an embodiment of the present invention.
- the WLAN system includes one or more Basic Service Sets (BSSs), which represent a set of devices that can successfully synchronize and communicate with each other.
- BSSs Basic Service Sets
- the BSS may be classified into an infrastructure BSS (Independent BSS) and an Independent BSS (IBSS), and FIG. 1 illustrates an infrastructure BSS.
- an infrastructure BSS (BSS1, BSS2) is an access point (PCP / AP) that is a station that provides one or more stations (STA1, STA2, STA3, STA4, STA5), and a distribution service.
- PCP / AP-2 PCP / AP-2
- DS Distribution System
- a station is any device that includes a medium access control (MAC) compliant with the IEEE 802.11 standard and a physical layer interface to a wireless medium. This includes both access points (APs) as well as non-AP stations.
- MAC medium access control
- APs access points
- 'terminal' may be used as a concept including both a station and an WLAN communication device such as an AP.
- the station for wireless communication may include a processor and a transmit / receive unit, and may further include a user interface unit and a display unit according to an embodiment.
- the processor may generate a frame to be transmitted through the wireless network or process a frame received through the wireless network, and may perform various processing for controlling the station.
- the transceiver is functionally connected to the processor and transmits and receives a frame through a wireless network for a station.
- An access point is an entity that provides access to a distribution system (DS) via a wireless medium for an associated station to the AP.
- DS distribution system
- the AP is used as a concept including a personal BSS coordination point (PCP), and is broadly used as a centralized controller, a base station (BS), a node-B, a base transceiver system (BTS), or a site. It can include all the concepts such as a controller.
- PCP personal BSS coordination point
- BS base station
- node-B a node-B
- BTS base transceiver system
- site can include all the concepts such as a controller.
- the plurality of infrastructure BSSs may be interconnected through a distribution system (DS).
- DS distribution system
- ESS extended service set
- FIG. 2 illustrates an independent BSS, which is a wireless LAN system according to another embodiment of the present invention.
- the same or corresponding parts as those of the embodiment of FIG. 1 will be omitted.
- BSS3 shown in FIG. 2 is an independent BSS and does not include an AP, all stations STA6 and STA7 are not connected to the AP. Independent BSSs do not allow access to the distribution system and form a self-contained network. In the independent BSS, the respective stations STA6 and STA7 may be directly connected to each other.
- FIG. 3 is a block diagram showing the configuration of a station 100 according to an embodiment of the present invention.
- the station 100 may include a processor 110, a transceiver 120, a user interface 140, a display unit 150, and a memory 160. .
- the transceiver 120 transmits and receives a wireless signal such as a wireless LAN packet, may be provided in the station 100 or externally provided.
- the transceiver 120 may include at least one transceiver module using different frequency bands.
- the transceiver 120 may include a transceiver module of different frequency bands such as 2.4 GHz, 5 GHz, and 60 GHz.
- the station 100 may include a transmission / reception module using a frequency band of 6 GHz or more and a transmission / reception module using a frequency band of 6 GHz or less.
- Each transmit / receive module may perform wireless communication with an AP or an external station according to a wireless LAN standard of a frequency band supported by the corresponding transmit / receive module.
- the transceiver 120 may operate only one transceiver module at a time or simultaneously operate multiple transceiver modules according to the performance and requirements of the station 100.
- each transmit / receive module may be provided in an independent form, or a plurality of modules may be integrated into one chip.
- the user interface unit 140 includes various types of input / output means provided in the station 100. That is, the user interface unit 140 may receive a user input by using various input means, and the processor 110 may control the station 100 based on the received user input. In addition, the user interface 140 may perform an output based on a command of the processor 110 using various output means.
- the display unit 150 outputs an image on the display screen.
- the display unit 150 may output various display objects such as contents executed by the processor 110 or a user interface based on a control command of the processor 110.
- the memory 160 stores a control program used in the station 100 and various data according thereto.
- a control program may include an access program necessary for the station 100 to perform an access with an AP or an external station.
- the processor 110 of the present invention may execute various instructions or programs and process data in the station 100.
- the processor 110 may control each unit of the station 100 described above, and may control data transmission and reception between the units.
- the processor 110 may execute a program for accessing an AP stored in the memory 160 and receive a communication setup message transmitted by the AP.
- the processor 110 may read information on the priority condition of the station 100 included in the communication configuration message, and request a connection to the AP based on the information on the priority condition of the station 100.
- the processor 110 of the present invention may refer to the main control unit of the station 100, and according to an embodiment, a part of the station 100 may be referred to, for example, a control unit for individually controlling the transceiver 120 and the like. You can also point it.
- the processor 110 controls various operations of the wireless signal transmission and reception of the station 100 according to an embodiment of the present invention. Specific embodiments thereof will be described later.
- the station 100 illustrated in FIG. 3 is a block diagram according to an embodiment of the present invention, in which blocks marked separately represent logical elements of devices. Therefore, the elements of the above-described device may be mounted in one chip or in a plurality of chips according to the design of the device. For example, the processor 110 and the transceiver 120 may be integrated into one chip or implemented as a separate chip. In addition, in the embodiment of the present invention, some components of the station 100, such as the user interface unit 140 and the display unit 150, may be selectively provided in the station 100.
- FIG. 4 is a block diagram illustrating a configuration of an AP 200 according to an exemplary embodiment.
- the AP 200 may include a processor 210, a transceiver 220, and a memory 260.
- a processor 210 may include a central processing unit (CPU) 210, a graphics processing unit (GPU), and a central processing unit (GPU) 210.
- a transceiver 220 may include a central processing unit (GPU) 210, and a central processing unit (GPU) 210.
- a memory 260 may include a processor 210, a transceiver 220, and a memory 260.
- FIG. 4 overlapping descriptions of parts identical or corresponding to those of the station 100 of FIG. 3 will be omitted.
- the AP 200 includes a transceiver 220 for operating a BSS in at least one frequency band.
- the transceiver 220 of the AP 200 may also include a plurality of transceiver modules using different frequency bands. That is, the AP 200 according to the embodiment of the present invention may be provided with two or more transmit / receive modules of different frequency bands, for example, 2.4 GHz, 5 GHz, and 60 GHz.
- the AP 200 may include a transmission / reception module using a frequency band of 6 GHz or more and a transmission / reception module using a frequency band of 6 GHz or less.
- Each transmit / receive module may perform wireless communication with a station according to a wireless LAN standard of a frequency band supported by the corresponding transmit / receive module.
- the transceiver 220 may operate only one transceiver module at a time or simultaneously operate multiple transceiver modules according to the performance and requirements of the AP 200.
- the memory 260 stores a control program used in the AP 200 and various data according thereto.
- a control program may include an access program for managing a connection of a station.
- the processor 210 may control each unit of the AP 200 and may control data transmission and reception between the units.
- the processor 210 may execute a program for accessing a station stored in the memory 260 and transmit a communication setting message for one or more stations.
- the communication setting message may include information on the access priority condition of each station.
- the processor 210 performs connection establishment according to a connection request of a station.
- the processor 210 controls various operations of wireless signal transmission and reception of the AP 200 according to an embodiment of the present invention. Specific embodiments thereof will be described later.
- FIG. 5 schematically illustrates a process in which an STA establishes a link with an AP.
- the scanning step is a step in which the STA 100 obtains access information of a BSS operated by the AP 200.
- a passive scanning method for obtaining information by using only a beacon message S101 periodically transmitted by the AP 200, and a STA 100 requests a probe to the AP.
- the STA 100 that has successfully received the radio access information in the scanning step transmits an authentication request (S107a), receives an authentication response from the AP 200 (S107b), and performs an authentication step. do.
- the STA 100 transmits an association request (S109a), receives an association response from the AP 200 (S109b), and performs the association step.
- the 802.1X based authentication step S111 and the IP address obtaining step S113 through DHCP may be performed.
- the authentication server 300 is a server that processes 802.1X-based authentication with the STA 100 and may be physically coupled to the AP 200 or may exist as a separate server.
- one wireless communication terminal When transmitting data using Orthogonal Frequency Division Multiple Access or Multi Input Multi Output (MIMO), one wireless communication terminal simultaneously transmits data to a plurality of wireless communication terminals. Can be. In addition, any one wireless communication terminal can receive data from a plurality of wireless communication terminals at the same time.
- An embodiment of the present invention in which one wireless communication terminal transmits data to a plurality of wireless communication terminals will be described with reference to FIG. 6 and subsequent drawings. In particular, it will be described with reference to FIG. 6 and later that any one wireless communication terminal allocates a frequency band to each of the plurality of wireless communication terminals and signals information about the allocated frequency band.
- any one wireless communication terminal may allocate a sub-channel to each of the plurality of wireless communication terminals.
- a sub-channel is a sub-frequency band included in a channel having a minimum unit frequency bandwidth or more that any one wireless communication terminal can use.
- the minimum unit frequency bandwidth represents the size of the smallest frequency band that can be used by the first wireless communication terminal. In a specific embodiment, the minimum unit frequency bandwidth may be 20 MHz.
- any one wireless communication terminal communicating with a plurality of wireless communication terminals at the same time is referred to as a first wireless communication terminal, and a plurality of wireless communication terminals communicating with the first wireless communication terminal simultaneously with a plurality of second wireless terminals.
- the first wireless communication terminal may also be referred to as a base wireless communication terminal.
- the first wireless communication terminal may be a wireless communication terminal for allocating and scheduling communication medium resources in communication with the plurality of wireless communication terminals.
- the first wireless communication terminal may function as a cell coordinator.
- the first wireless communication terminal may be the access point 200.
- the second wireless communication terminal may be a station 100 associated with the access point 200.
- the first wireless communication terminal may be a wireless communication terminal for allocating communication medium resources and scheduling in an independent network that is not connected to an external distribution service such as an ad-hoc network.
- the first wireless communication terminal may be at least one of a base station, an eNB, and a transmission point (TP).
- FIG. 6 shows a channel allocated to a wireless communication terminal in the 2.4 GHz band according to an embodiment of the present invention.
- An unlicensed frequency band is a frequency band designated for universal use without a specific purpose.
- the 100 MHz frequency band of 2.4 GHz to 2.5 GHz is an unlicensed Industrial Scientific Medical (ISM) frequency band designated for industrial, scientific, and medical use.
- ISM Industrial Scientific Medical
- a wireless communication terminal for wireless LAN communication in the 100 MHz frequency band of 2.4 GHz to 2.5 GHz may use channels 1 to 13 in 5 MHz units.
- the channel number is assigned by the Institute of Electrical and Electronics Engineers (IEEE).
- the center frequency of channel 1 is 2412 MHz
- the center frequency of channel 2 is 2417 MHz
- the center frequency of channel 13 is 2472 MHz.
- channels 1 through 11 are used, and most countries outside the US use channels 1 through 13.
- the wireless communication terminal When the wireless communication terminal uses a 20MHz bandwidth, in order to minimize interference and use a frequency band without overlapping, the wireless communication terminal should use channel 1, channel 5, channel 9, and channel 13. However, in the United States, channels 12 and 13 cannot be used, so the 20MHz frequency band of three channels 1, 6, and 11 is used to minimize the interference between channels.
- the existing 802.11n standard specifies that the wireless communication terminal uses a 40MHz frequency band centered on channel 3 or channel 4.
- a wireless communication terminal may use a 40 MHz frequency band centering on channel 11 as well as channel 3 and channel 4.
- the wireless communication terminal according to an embodiment of the present invention may use the 80MHz frequency band centering on channel 7.
- the first wireless communication terminal When the first wireless communication terminal communicates with a plurality of second wireless communication terminals through orthogonal frequency-division multiple access (OFDMA) in the 2.4 GHz band, the first wireless communication terminal has a bandwidth of any one of 20 MHz, 40 MHz, and 80 MHz. It is possible to use a frequency band having a.
- OFDMA orthogonal frequency-division multiple access
- each of the plurality of second wireless communication terminals may be allocated a sub-frequency band having any one of bandwidths of 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, and 20 MHz.
- the sub-frequency band is a frequency band included in the entire frequency band and having a bandwidth smaller than that of the entire frequency band.
- the first wireless communication terminal communicates with two second wireless communication terminals and uses a 20 MHz frequency band
- the first wireless communication terminal has a sub-frequency having a 10 MHz bandwidth in each of the two second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal may assign a sub-frequency band having a 20 MHz bandwidth to each of the two second wireless communication terminals. Can be assigned.
- the first wireless communication terminal communicates with two second wireless communication terminals and uses an 80 MHz frequency band
- the first wireless communication terminal has a sub-frequency band having a 40 MHz bandwidth to each of the two second wireless communication terminals. Can be assigned.
- FIG 7 shows a channel allocated to a wireless communication terminal in the 5GHz band according to an embodiment of the present invention.
- the 665 MHz frequency band from 5.170 GHz to 5.835 GHz is also an unlicensed ISM frequency band designated for industrial, scientific, and medical use.
- a wireless communication terminal for wireless LAN communication selects and uses various non-overlapping channels in the 5 GHz frequency band.
- the channel number assigned by the IEEE is used in 5 MHz units.
- the start frequency of channel 34 is 5170MHZ
- the start frequency of channel 35 is 5175MHz.
- the center frequency of the channel having a 20 MHz bandwidth combining channels 34 to 37 is the same as the start frequency of channel 36. Accordingly, a channel having a 20 MHz bandwidth combining channels 34 to 37 may be referred to as 36 channel 20 MHz.
- the wireless communication terminal can use only non-overlapping 20 MHz channels such as channels 36, 40, and 44 in the 5 GHz frequency band, and overlaps with adjacent channels as in the 2.4 GHz band. Channels cannot be used.
- a wireless communication terminal may use a channel having a 20 MHz, 40 MHz, 80 MHz, and 160 MHz bandwidth in a 5 GHz band.
- the first wireless communication terminal allocates the frequency bandwidth to three or four second wireless communication terminal evenly, the first wireless communication terminal is any of 5MHz, 10MHz, 20MHz, and 40MHz to each of the second wireless communication terminal It is possible to allocate a sub-frequency band having one bandwidth.
- the first wireless communication terminal allocates the frequency bandwidth to the two second wireless communication terminal evenly, the first wireless communication terminal to the bandwidth of any one of 10MHz, 20MHz, and 40MHz to each of the second wireless communication terminal Can have a sub-frequency band.
- FIG 8 illustrates a principle in which one wireless communication terminal allocates a frequency band having a minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an embodiment of the present invention.
- the first wireless communication terminal may transmit data to the plurality of second wireless communication terminals according to the following principle described in FIG.
- the first wireless communication terminal can transmit data to up to four second wireless communication terminals at the same time.
- any one wireless communication terminal can transmit data to four wireless communication terminals through MIMO (Multi-Input Multi-Output). Accordingly, when the first wireless communication terminal transmits data to four second wireless communication terminals, the previously defined signaling field may be used.
- the first wireless communication terminal may allocate frequency bands having bandwidths equal to each other to the plurality of second wireless communication terminals. In this case, the number of cases for the frequency bands to which each of the plurality of second wireless communication terminals is allocated is reduced. Therefore, the first wireless communication terminal can reduce the signaling burden by allocating a frequency band having an equivalent bandwidth to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal may transmit a plurality of second radios through the corresponding frequency band only when a primary channel having a minimum unit frequency band is idle in a frequency band used by the first wireless communication terminal. Data can be transmitted to the communication terminal.
- the primary channel is assumed to be a frequency band located in the lowest frequency band of the frequency band used by the first wireless communication terminal.
- the second wireless communication terminal does not need to perform a clear channel assessment (CCA) on a secondary channel of a corresponding frequency band. This is because the first wireless communication terminal always transmits data to the plurality of second wireless communication terminals including the main channel of the corresponding frequency band. Therefore, through this, the first wireless communication terminal can reduce the CCA burden of the second wireless communication terminal.
- CCA clear channel assessment
- the first wireless communication terminal may perform only a single user (SU) MIMO transmission in the sub-frequency band. This is because the hardware complexity of the first wireless communication terminal may increase if the first wireless communication terminal performs multi-user (MU) MIMO transmission in the sub-frequency band.
- SU single user
- MU multi-user
- the first wireless communication terminal may transmit data to the plurality of second wireless communication terminals according to the following principle described in FIG. 8 (b).
- the first wireless communication terminal may simultaneously transmit data to four or more second wireless communication terminals. In this case, however, the previously defined signaling field should be modified and used.
- the first wireless communication terminal may allocate a frequency band having bandwidths that are not equal to each other to each of the plurality of second wireless communication terminals.
- the signaling complexity for the second wireless communication terminal of the first wireless communication terminal is increased than when the first wireless communication terminal allocates frequency bands having bandwidths equal to each other to the plurality of second wireless communication terminals.
- the first wireless communication terminal includes a plurality of second channels through the corresponding frequency band even when a primary channel having a minimum unit frequency band in the frequency band used by the first wireless communication terminal is not idle. Data can be transmitted to a wireless communication terminal.
- the second wireless communication terminal must perform CCA for the secondary channel even when a frame of another BSS is transmitted through the primary channel of the corresponding frequency band. Therefore, the CCA burden on the second wireless communication terminal is increased compared to the above-described embodiment.
- the first wireless communication terminal transmits data to the plurality of second wireless communication terminals in accordance with at least one of the plurality of principles described in FIG. 8A.
- the first wireless communication terminal may transmit data by modifying any one of the plurality of principles described with reference to FIG. 8 (a) to one of the plurality of principles described with reference to FIG. 8 (b).
- the first wireless communication terminal can equally allocate a frequency band used by the first wireless communication terminal to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal may include a frequency band having a bandwidth equal to a value obtained by dividing a bandwidth of a frequency band that can be used by the first wireless communication terminal by the number of second plurality of wireless communication terminals, respectively. Can be assigned to.
- the number of the second wireless communication terminal may not be a divisor of an integer corresponding to the size of the bandwidth.
- the first wireless communication terminal may allocate a frequency band to each of the plurality of second wireless communication terminals by dividing the bandwidth of the frequency band available to the first wireless communication terminal by a specific integer.
- the specific integer may be an integer greater than the number of the plurality of second wireless communication terminals and closest to the number of the plurality of second wireless communication terminals.
- the maximum number may be the plurality of second wireless communication terminals.
- FIG. 9 shows that one wireless communication terminal allocates a frequency band having a minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an embodiment of the present invention.
- the first wireless communication terminal uses a frequency band having a bandwidth of the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is four
- the first wireless communication terminal is the minimum unit for each of the four second wireless communication terminals.
- a frequency band having a bandwidth equal to 1/4 of the frequency bandwidth may be allocated.
- the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is four, as shown in FIG. 9 (a-1)
- the first wireless communication terminal has a frequency having a 5 MHz bandwidth for each of the four second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal uses a frequency band having a minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is two
- the first wireless communication terminal is a minimum unit to each of the two second wireless communication terminals.
- a frequency band having a bandwidth of 1/2 the frequency bandwidth may be allocated.
- the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is two, as shown in FIG. 9 (a-2)
- the first wireless communication terminal has a frequency having a 10 MHz bandwidth for each of the two second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal uses a frequency band having a minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is three, the first wireless communication terminal is the minimum unit to each of the three second wireless communication terminals.
- a frequency band having a bandwidth of 1/4 of the frequency bandwidth can be allocated.
- the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is three, the first wireless communication terminal has a frequency band having a 5 MHz bandwidth for each of the three second wireless communication terminals. Can be assigned.
- the first wireless communication terminal may allocate a channel having bandwidth as much as the minimum unit frequency bandwidth divided by the maximum number of the plurality of second wireless communication terminals to each of the plurality of second wireless communication terminals. For example, when the maximum number of the plurality of second wireless communication terminals is four, the minimum unit frequency bandwidth is 20 MHz and the number of the second wireless communication terminals is two, as shown in FIG. 2 A frequency band having a 5MHz bandwidth can be allocated to each of the wireless communication terminals. In this case, the frequency bandwidth allocated to the plurality of second wireless communication terminals is always constant. Accordingly, the burden of signaling information about frequency band allocation to the second wireless communication terminal can be reduced.
- the first wireless communication terminal wastes frequency bands.
- FIG. 10 shows that one wireless communication terminal allocates a frequency band having a bandwidth twice the minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an exemplary embodiment.
- the first wireless communication terminal uses a frequency band having a bandwidth twice the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is four
- the first wireless communication terminal is each of four second wireless communication terminals.
- the first wireless communication terminal uses a frequency band having a bandwidth that is twice the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is two
- the first wireless communication terminal is two second wireless communication terminals.
- Each can be assigned a frequency band having a bandwidth of the minimum unit frequency bandwidth. For example, when the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is two as shown in FIG. 10 (a-2), the first wireless communication terminal has a frequency having a 20 MHz bandwidth for each of the two second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal uses a frequency band having a bandwidth that is twice the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is three
- the first wireless communication terminal is three second wireless communication terminals.
- Each may be allocated a frequency band having a bandwidth that is 1/2 of the minimum unit frequency bandwidth.
- the minimum unit frequency bandwidth is 20 MHz and the number of the second wireless communication terminals is three
- the first wireless communication terminal provides a frequency band having a 10 MHz bandwidth to each of the three second wireless communication terminals. Can be assigned. At this time, the frequency band of the 10MHz bandwidth of the frequency band that can be used by the first wireless communication terminal is not used.
- the first wireless communication terminal when the first wireless communication terminal cannot use the primary channel having the minimum unit frequency bandwidth, data may not be transmitted to the plurality of second wireless communication terminals.
- a primary channel having a 20 MHz bandwidth is idle, and a secondary channel having a 20 MHz bandwidth next to the primary channel may not be idle.
- the first wireless communication terminal may transmit data to the plurality of second wireless communication terminals through the primary channel.
- the first wireless communication terminal may not transmit data to the plurality of second wireless communication terminals using only the subchannels without using the primary channel.
- the primary channel is not idle and the secondary channel is idle, as in the embodiment of FIG. 10 (d-2)
- the first wireless communication terminal cannot transmit data to the plurality of second wireless communication terminals. This is to reduce the CCA operation burden on the plurality of second wireless communication terminals as described above.
- FIG. 11 shows that one wireless communication terminal allocates a frequency band having a bandwidth that is four times the minimum unit frequency bandwidth to a plurality of wireless communication terminals, according to an exemplary embodiment.
- the first wireless communication terminal uses a frequency band having a bandwidth four times the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is four, the first wireless communication terminal is assigned to each of the four second wireless communication terminals.
- a frequency band having the minimum unit frequency bandwidth can be allocated. For example, when the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is four, as shown in FIG. 11 (a-1), the first wireless communication terminal has a frequency having a 20 MHz bandwidth for each of the four second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal uses a frequency band having a bandwidth that is four times the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is two
- the first wireless communication terminal is two second wireless communication terminals.
- Each can be assigned a frequency band with a bandwidth that is twice the minimum unit frequency bandwidth. For example, when the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is two, as shown in FIG. 11 (a-2), the first wireless communication terminal has a frequency having a 40 MHz bandwidth to each of the two second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal uses a frequency band having four times the bandwidth of the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is three, the first wireless communication terminal is three second wireless communication A frequency band having a bandwidth of the minimum unit frequency bandwidth may be allocated to each terminal. For example, as shown in FIG. 11B, when the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is three, the first wireless communication terminal provides a frequency band having 20 MHz bandwidth to each of the three second wireless communication terminals. Can be assigned. At this time, the frequency band of the 20MHz bandwidth of the frequency band that can be used by the first wireless communication terminal is not used.
- the first wireless communication terminal when the first wireless communication terminal cannot use the primary channel having the minimum unit frequency bandwidth, data may not be transmitted to the plurality of second wireless communication terminals.
- a primary channel having a 20 MHz bandwidth is idle, and a secondary channel is idle. May not be.
- the first wireless communication terminal may transmit data to the plurality of second wireless communication terminals through a sub channel idle with the primary channel.
- the first wireless communication terminal may not transmit data to the plurality of second wireless communication terminals using only the subchannels without using the primary channel.
- the first wireless communication terminal when the primary channel is not idle and the subchannel is idle, the first wireless communication terminal is configured with a plurality of second wireless communication terminals. Cannot send data to This is to reduce the CCA operation burden on the plurality of second wireless communication terminals as described above.
- FIG. 12 shows that one wireless communication terminal allocates a frequency band having a bandwidth of eight times the minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an exemplary embodiment.
- the first wireless communication terminal uses a frequency band having a bandwidth eight times the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is four, the first wireless communication terminal is assigned to each of the four second wireless communication terminals.
- a frequency band having a bandwidth twice the minimum unit frequency bandwidth may be allocated. For example, when the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is four, as shown in FIG. 12 (a-1), the first wireless communication terminal has a frequency having a 40 MHz bandwidth for each of the four second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal uses a frequency band having a bandwidth eight times the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is two
- the first wireless communication terminal is two second wireless communication terminals.
- Each can be assigned a frequency band with four times the bandwidth of the minimum unit frequency bandwidth. For example, when the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is two, as shown in FIG. 12 (a-2), the first wireless communication terminal has a frequency having an 80 MHz bandwidth for each of the two second wireless communication terminals. Bands can be allocated.
- the first wireless communication terminal uses a frequency band having a bandwidth eight times the minimum unit frequency bandwidth and the number of the plurality of second wireless communication terminals is three, the first wireless communication terminal is three second wireless communication terminals.
- Each can be assigned a frequency band with a bandwidth that is twice the minimum unit frequency bandwidth. For example, as shown in FIG. 12B, when the minimum unit frequency bandwidth is 20 MHz and the number of second wireless communication terminals is three, the first wireless communication terminal has a frequency band having a 40 MHz bandwidth to each of the three second wireless communication terminals. Can be assigned. At this time, the frequency band of the 40MHz bandwidth of the frequency band that can be used by the first wireless communication terminal is not used.
- the first wireless communication terminal when the first wireless communication terminal cannot use the primary channel having the minimum unit frequency bandwidth, data may not be transmitted to the plurality of second wireless communication terminals.
- a primary channel having a 20 MHz bandwidth is idle and a secondary channel. (secondary channel) may not be idle.
- the first wireless communication terminal may transmit data to the plurality of second wireless communication terminals through a sub channel idle with the primary channel.
- the first wireless communication terminal may not transmit data to the plurality of second wireless communication terminals using only the subchannels without using the primary channel.
- the first wireless communication terminal when the primary channel is not idle and the subchannel is idle, the first wireless communication terminal is It is not possible to transmit data to a plurality of second wireless communication terminals. This is to reduce the CCA operation burden on the plurality of second wireless communication terminals as described above.
- 9 through 12 illustrate that the first wireless communication terminal allocates frequency bandwidths equal to each other to the plurality of second wireless communication terminals.
- 13 through 15 illustrate that the first wireless communication terminal allocates frequency bandwidths that are not equal to each other to each of the plurality of second wireless communication terminals.
- FIG. 13 is a diagram for allocating a contiguous sub-band or a non-contiguous sub-band included in a frequency band to a plurality of stations by one wireless communication terminal according to an exemplary embodiment of the present invention. Shows.
- the first wireless communication terminal may allocate frequency bands having uneven frequency bandwidths to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal may allocate a plurality of continuous frequency bands having uneven frequency bandwidths to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal may allocate a frequency band to each of the plurality of second wireless communication terminals through the following process.
- the first wireless communication terminal obtains a basic allocation value by dividing the bandwidth of the frequency band that can be used by the first wireless communication terminal by the maximum value of the number of the plurality of second wireless communication terminals.
- the first wireless communication terminal acquires a remaining value excluding the product of the number of the plurality of second wireless communication terminals and the default allocation value in the bandwidth of the frequency band available to the first wireless communication terminal.
- the first wireless communication terminal allocates the obtained remaining value to the plurality of second wireless communication terminals.
- the first wireless communication terminal may allocate the obtained remaining value based on the size of data to be transmitted to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal may allocate a frequency band corresponding to the obtained remaining value in proportion to the size of data to be transmitted to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal may allocate all the frequency bands of the acquired remaining values to the second wireless communication terminal that will receive the largest data among the plurality of second wireless communication terminals.
- BWassign BW / Nmax + BWadd
- BWassign represents a bandwidth of a frequency band allocated to any second wireless communication terminal.
- BW represents a bandwidth of a frequency band that can be used by the first wireless communication terminal.
- Nmax represents the maximum value of the second wireless communication terminal.
- BWadd represents a bandwidth of a frequency band additionally allocated to any second wireless communication terminal.
- f (a) represents a function of allocating the remaining frequency band
- n represents the number of the plurality of second wireless communication terminals. The function of allocating the remaining frequency bands may be allocated to each of the plurality of second wireless communication terminals based on the size of data to be transmitted to each of the plurality of second wireless communication terminals as described above.
- the maximum number of second wireless communication terminals is four.
- the first wireless communication terminal May be allocated to each of the plurality of second wireless communication terminals unevenly and divide the frequency band (BW) that can be used by the first wireless communication terminal.
- BW frequency band
- the bandwidths of the frequency bands of any one of the second wireless communication terminals are different from each other. It may be twice the bandwidth of the frequency band of the wireless communication terminal.
- the first wireless communication terminals have frequency bandwidths equal to each other in the plurality of second wireless communication terminals. Frequency bands can be allocated.
- 13 (a), 13 (b), and 13 (c) have been described in which the first wireless communication terminal allocates a continuous frequency band to each of the plurality of second wireless communication terminals.
- 13 (d), 13 (e), and 13 (f) illustrate that the first wireless communication terminal allocates a continuous frequency band to each of the plurality of second wireless communication terminals.
- the first The wireless communication terminals are equally divided into three frequency bands (BW) that can be used by the first wireless communication terminal to three second wireless communication terminals, and then assigned to each of the three second wireless communication terminals.
- BW frequency bands
- the first wireless communication terminal may allocate the remaining frequency band to any one second wireless communication terminal based on data to be transmitted to the three second wireless communication terminals.
- the first wireless communication terminal may allocate a discontinuous frequency band to the second wireless communication terminal.
- a frequency band indicated by STAx may be allocated to the first station STA1 or the second station STA2.
- the first wireless communication terminal equally divides the frequency bands (BW) that can be used by the first wireless communication terminal to two second wireless communication terminals by four, and then 2 One each is allocated to two second wireless communication terminals.
- the first wireless communication terminal may equally allocate the remaining frequency bands to the two second wireless communication terminals or all of the second wireless communication terminals. In this case, the first wireless communication terminal may allocate a discontinuous frequency band to the second wireless communication terminal as in the embodiment of 13 (d) described above.
- the first wireless communication terminal when the number of the second wireless communication terminals is one and the subchannels other than the primary channel are not in the idle state, the first wireless communication terminal has one second wireless communication in all idle bands. It can be assigned to the terminal.
- FIG. 14 shows that the first wireless communication terminal allocates three consecutive frequency bands or discontinuous frequency bands to three second wireless communication terminals according to the radio frequency allocation method described with reference to FIG. 13.
- 14 (a-0), 14 (b-0), 14 (c-0), and 14 (d-0) a first wireless communication terminal transmits a part of frequency bands to a plurality of second wireless communication.
- An embodiment of not allocating to a terminal is shown.
- 14 (c-1-2), 14 (d-1-1), and 14 (d-1-2) show a second wireless communication terminal in which the first wireless communication terminal is different from the first station STA1. The case of allocating more frequency bands is shown.
- 14 (c-2-2), 14 (d-2-1), and 14 (d-2-2) show a second wireless communication terminal in which the first wireless communication terminal is different from the second station STA2. The case of allocating more frequency bands is shown.
- 14 (c-3-2), 14 (d-3-1), and 14 (d-3-2) show a second wireless communication terminal in which the first wireless communication terminal is different from the third station STA3. The case of allocating more frequency bands is shown.
- FIG. 15 shows that a first radio communication terminal allocates a continuous frequency band or a discontinuous frequency band to two second radio communication terminals according to the radio frequency allocation method described with reference to FIG. 13.
- a first wireless communication terminal transmits a part of frequency bands to a plurality of second wireless communication.
- An embodiment of not allocating to a terminal is shown.
- 15 (c-4-2), 15 (d-1-1), 15 (d-1-2), 15 (d-4-1), and 15 (d-4-2) Shows a case in which the first wireless communication terminal allocates a larger frequency band to one second wireless communication terminal than the other second wireless communication terminal.
- 15 (c-3-2), 15 (d-2-1), 15 (d-2-2), 15 (d-3-1), and 15 (d-3-2) It is shown that the first wireless communication terminal allocates a frequency band having an equivalent bandwidth to two door communication terminals.
- 15 shows that one wireless communication terminal allocates a frequency band to two wireless communication terminals according to an embodiment of the present invention.
- the first wireless communication terminal may allocate a frequency band having the minimum unit frequency bandwidth to the plurality of second wireless communication terminals.
- the number of the plurality of second wireless communication terminals may be any one of four, three, and two.
- the first wireless communication terminal can transmit data to the plurality of second wireless communication terminals through the corresponding frequency band.
- the first wireless communication is performed even if the subchannel located after the minimum frequency unit bandwidth is not idle.
- the terminal may allocate a frequency band having a minimum frequency unit bandwidth to the plurality of second wireless communication terminals.
- FIG. 16 shows that one wireless communication terminal allocates a primary channel having a minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an embodiment of the present disclosure.
- FIG. 17 shows that a wireless communication terminal according to an embodiment of the present invention has a bandwidth that is twice the minimum unit frequency bandwidth and allocates a frequency band including a main channel to the plurality of wireless communication terminals.
- the first wireless communication terminal may allocate a frequency band having a bandwidth twice the minimum unit frequency bandwidth to the plurality of second wireless communication terminals.
- the number of the plurality of second wireless communication terminals may be any one of four, three, and two.
- the first wireless communication terminal equally divides the frequency bandwidth that can be used by the first wireless communication terminal as in the embodiment of FIG. 17 (a-1), and divides the continuous frequency bands into a plurality of second wireless communication terminals, respectively. Can be assigned to.
- the first wireless communication terminal may equally divide the frequency bandwidth that can be used by the first wireless communication terminal, and allocate discontinuous frequency bands to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal first equally allocates a frequency band having the minimum unit frequency bandwidth to the plurality of second wireless communication terminals, and has the remaining minimum unit frequency bandwidth.
- the frequency band can be allocated to the plurality of second wireless communication terminals evenly. In this case, each of the plurality of second wireless communication terminals is assigned a discontinuous frequency band.
- the first wireless communication terminal when the primary channel having the minimum unit frequency bandwidth in the frequency band is idle, the first wireless communication terminal can transmit data to the plurality of second wireless communication terminals through the corresponding frequency band. Accordingly, as shown in the embodiments of FIGS. 17B and 17B-2, the first wireless communication terminal may be configured even if the subchannel located next to the frequency band including the primary channel is not idle. A frequency band having a minimum frequency unit bandwidth may be allocated to the second wireless communication terminal.
- FIG. 18 shows that one wireless communication terminal allocates a frequency band having a bandwidth that is four times the minimum unit frequency bandwidth to a plurality of wireless communication terminals, according to an exemplary embodiment.
- the first wireless communication terminal may allocate a frequency band having a bandwidth four times the minimum unit frequency bandwidth to the plurality of second wireless communication terminals.
- the number of the plurality of second wireless communication terminals may be any one of four, three, and two.
- the first wireless communication terminal equally divides the frequency bandwidth that can be used by the first wireless communication terminal as in the embodiment of FIG. 18 (a-1), and divides the continuous frequency bands into a plurality of second wireless communication terminals, respectively. Can be assigned to.
- the first wireless communication terminal may equally divide the frequency bandwidth that can be used by the first wireless communication terminal, and allocate discontinuous frequency bands to each of the plurality of second wireless communication terminals. Specifically, the first wireless communication terminal divides the frequency band that can be used by the first wireless communication terminal into four frequency bands having a minimum unit frequency bandwidth as in the embodiment of 18 (a-2), and divides the four frequency bands. Each of the bands can be equally allocated to each of the plurality of second wireless communication terminals. In this case, each of the plurality of second wireless communication terminals is assigned a discontinuous frequency band.
- the first wireless communication terminal when the primary channel having the minimum unit frequency bandwidth in the frequency band is idle, the first wireless communication terminal can transmit data to the plurality of second wireless communication terminals through the corresponding frequency band. Therefore, as shown in the embodiments of FIGS. 18 (b-1), 18 (b-2), 18 (b-3), and 18 (b-4), any one subchannel of the frequency band is idle. Even if not, when the primary channel is in the idle state, the first wireless communication terminal may transmit data to the plurality of second wireless communication terminals through the corresponding frequency band.
- FIG. 19 shows that one wireless communication terminal allocates a frequency band having a bandwidth that is eight times the minimum unit frequency bandwidth to a plurality of wireless communication terminals according to an exemplary embodiment.
- the first wireless communication terminal may allocate a frequency band having a bandwidth eight times the minimum unit frequency bandwidth to the plurality of second wireless communication terminals.
- the number of the plurality of second wireless communication terminals may be any one of four, three, and two.
- the first wireless communication terminal equally divides the frequency bandwidth that can be used by the first wireless communication terminal by the number of the plurality of second wireless communication terminals as in the embodiment of FIG. A band can be allocated to each of the plurality of second wireless communication terminals.
- the first wireless communication terminal may equally divide the frequency bandwidth that can be used by the first wireless communication terminal, and allocate discontinuous frequency bands to each of the plurality of second wireless communication terminals. Specifically, the first wireless communication terminal divides the frequency band that can be used by the first wireless communication terminal into eight frequency bands having the minimum unit frequency bandwidth as in the embodiment of 19 (a-2), and divides the eight frequencies Each of the bands can be equally allocated to each of the plurality of second wireless communication terminals. In this case, each of the plurality of second wireless communication terminals is assigned a discontinuous frequency band.
- the first wireless communication terminal can transmit data to the plurality of second wireless communication terminals through the corresponding frequency band.
- the first wireless communication terminal may transmit data to the plurality of second wireless communication terminals through the corresponding frequency band.
- FIG. 20 illustrates a format of a physical frame according to an embodiment of the present invention.
- a physical frame transmitted by a wireless communication terminal includes an L-STF field, an L-LTF field, an L-SIG field, an HE-SIG-A field, an HE-STF field, an HE-LTF field, and It includes the HE-SIG-B field.
- the L-STF field represents a short training signal that can be decoded by both a wireless communication terminal supporting an embodiment of the present invention and a wireless communication terminal not supporting the embodiment of the present invention.
- the training signal is a signal that assists in demodulation and decoding setup of a wireless communication terminal for receiving a signal to be transmitted after transmission of the training signal.
- the short training signal is a training signal having a relatively short signal length.
- the wireless communication terminal performs automatic gain control (AGC) on an OFDM symbol including an L-LTF field and an L-SIG field based on a short training signal, performs an OFDM symbol and timing and includes an L-SIG field. Frequency can be synchronized.
- AGC automatic gain control
- the L-LTF field indicates a long training signal that can be decoded by both a wireless communication terminal supporting an embodiment of the present invention and a wireless communication terminal not supporting the embodiment of the present invention.
- the long training signal is a training signal having a relatively long signal length.
- the wireless communication terminal may estimate a fine frequency offset and a channel of an OFDM symbol including an L-SIG field based on the long training signal.
- the L-SIG field is signaling information that can be decoded by both a wireless communication terminal supporting an embodiment of the present invention and a wireless communication terminal not supporting the embodiment of the present invention.
- the L-SIG field represents information about a data rate and a data length.
- the HE-SIG-A field signals information that is commonly applied to a plurality of second wireless communication terminals. This will be described later with reference to FIGS. 21 to 24.
- the HE-STF field represents a short training signal that can be decoded by a wireless communication terminal supporting an embodiment of the present invention.
- a wireless communication terminal supporting an embodiment of the present invention provides AGC (Automatic Gain Control) for an OFDM symbol including a HE-LTF field, a HE-SIG-B field, and data included in a payload based on a short training signal. Can be performed.
- the wireless communication terminal supporting the embodiment of the present invention is based on the short training signal for the timing and frequency of the OFDM symbol including the HE-LTF field, the HE-SIG-B field, and the data contained in the payload Synchronization can be performed.
- the HE-LTF field represents a long training signal that can be decoded by a wireless communication terminal supporting an embodiment of the present invention.
- a wireless communication terminal supporting an embodiment of the present invention may estimate a fine frequency offset and a channel of an OFDM symbol including a HE-SIG-B field and data included in a payload based on a long training signal. have.
- the HE-SIG-B field signals information about a plurality of second wireless communication terminals.
- the HE-SIG-A field may be represented by an OFDM x symbol and the HE-SIG-B may be represented by a length of an OFDM y symbol.
- the number of second wireless communication terminals that can transmit data by the first wireless communication terminal increases.
- the number of second wireless communication terminals capable of transmitting data by the first wireless communication terminal according to the value of x may be any one of 4, 8, 12, and 16.
- the HE-LTF may be transmitted in a variable number depending on the number of spatial streams of the first wireless communication terminal and the second wireless communication terminal.
- the second wireless communication terminal receiving the physical frame may obtain the duration of the physical frame based on the L-SIG field.
- the second wireless communication terminal may obtain information on a data rate and a data length from an L-SIG field to obtain a transmission time of a subsequent physical frame.
- the total transmission maximum time from the HE-SIG-A field to the data field can be limited to 5.464 ms.
- FIG. 21 shows the format of a SIG-A field according to an embodiment of the present invention.
- the SIG-A field supports downlink Multi User-Multi Input Multi Output (MU-MIMO). Therefore, the configuration of the SIG-A field varies depending on whether the physical frame is a frame for a single user (SU) or a frame for a multiple user (MU).
- MU-MIMO downlink Multi User-Multi Input Multi Output
- Physical frames for SU are BW field, STBC field, Goup ID field, NSTS field, Partial AID field, TXOP_PS field, SHORT GI field, GI_NYSM field, Coding field, LDPC extra field, MCS field, Beamformed field, CRC field, and It may include at least one of the tail field.
- the BW field represents a bandwidth of a frequency band in which a physical frame is transmitted.
- the BW field may indicate 20 MHz, 40 MHz, 80 MHz, and 160 MHz.
- the STBC field indicates whether space time block coding is applied.
- the Group ID field indicates whether it is a physical frame for SU.
- the value of the Group ID field is a specific value, this may represent a physical frame for SU.
- the specific value may be at least one of 0 and 63.
- the NSTS field indicates the number of space-time radio streams to transmit to the second wireless communication terminal.
- the number of transmission of the LTF field varies according to the number of space-time radio streams.
- the number of space-time radio streams is 1, 2, 4, 6, and 8, 1, 2, 4, 6, and 8 LTF fields are transmitted, respectively.
- the number of space-time radio streams is 3, 5, 7, 4, 6, 8 LTF fields are transmitted.
- the Partial AID field indicates a partial association ID (AID) of the second wireless communication terminal to receive the frame.
- the second wireless communication terminal can receive the physical frame based on the Partial AID field.
- the Partial AID field value indicates the second wireless communication terminal, the second wireless communication terminal may receive a physical frame.
- the SHORT GI field indicates whether data including a physical frame has a relatively short GI (Guard Interval) value.
- the TXOP_PS field indicates whether a wireless communication terminal other than the wireless communication terminal receiving the frame may enter the power save mode while the physical frame is transmitted by the first wireless communication terminal.
- the GI_NYSM field indicates N SYM value when a short GI is used.
- Coding field indicates whether LDPC coding is applied to data.
- the LDPC extra field indicates whether LDPC coding is applied to data to include additional OFDM symbols.
- the MCS field represents a Modulation & Coding Scheme (MCS) of a signal including data.
- MCS Modulation & Coding Scheme
- the Beamformed field indicates whether beamforming has been applied.
- the CRC field indicates whether the SIG-A field contains an error.
- the Tail field indicates the end of the SIG-A field.
- the physical frame for the MU may include at least one of a BW field, an STBC field, a Goup ID field, a plurality of NSTS fields, a TXOP_PS field, a SHORT G1 field, a GI_NYSM field, a plurality of coding fields, an LDPC extra field, a CRC field, and a tail field. It may include.
- the Group ID field indicates a group identifier for identifying a group including a second wireless communication terminal to receive a physical frame.
- the Group ID field may have a value of 1 to 62 instead of 0 or 63.
- the value of the Group ID field identifies a group including a plurality of second wireless communication terminals. In this case, the number of the plurality of second wireless communication terminals may be four.
- the plurality of NSTS fields indicate the number of space-time radio streams to be transmitted to each of the plurality of second wireless communication terminals belonging to the group indicated by the GID.
- the value of the NSTS field is the number of radio streams transmitted to the second radio communication terminal.
- the MCS value of the signal containing the data is signaled by the SIG-B.
- this SIG-A field is not considered for MU transmission through OFDMA. Therefore, a SIG-A field capable of signaling MU transmission through OFDMA is needed. This will be described with reference to FIGS. 22 to 24.
- FIG. 22 shows the format of a SIG-A field according to another embodiment of the present invention.
- the format of the SIG-A field may vary depending on whether it is a physical frame for SU or a physical frame for MU. In addition, even in the physical frame for the SU, the format of the SIG-A field may vary depending on whether it is a physical frame for downlink transmission or a physical frame for uplink transmission.
- the SIG-A field may include a field indicating whether to apply OFDMA.
- the first wireless communication terminal transmits data through the OFDMA to the second wireless communication terminal through the frequency band allocated to the second wireless communication terminal, and transmits the SU-MIMO through the frequency band allocated to the second wireless communication terminal. Can be performed.
- the minimum unit frequency bandwidth may be 20 MHz.
- the SIG-A field included in the physical frame for MU OFDMA transmission may include a field indicating whether frequency bands allocated to each of the plurality of second wireless communication terminals are continuous.
- FIG. 22 (a) shows a SIG-A field included in a physical frame for downlink transmission on SU.
- the SIG-A fields included in the physical frame for SU include BW field, OFDMA field, STBC field, Goup ID field, NSTS field, Partial AID field, BSS Color field, Contiguous field 20 MHz SIG field SHORT G1 field, GI_NYSM field, It may include at least one of a coding field, an LDPC extra field, an MCS field, a beamformed field, an uplink field, a CRC field, and a tail field.
- the OFDMA field indicates whether it is a physical frame for MU transmission over OFDMA.
- the value of the OFDMA field is zero.
- the Contiguous field indicates whether the frequency band allocated to the second wireless communication terminal is contiguous.
- the 20 MHz SIG field indicates whether at least one of the SIG-A field and the SIG-B field is repeated per minimum unit frequency bandwidth. In the case of a physical frame for SU, the SIG-B field may be omitted. Therefore, the 20 MHz SIG field indicates whether the SIG-A field is repeated every minimum unit frequency bandwidth.
- the Uplink field indicates whether the physical frame is for uplink transmission. In the case of FIG. 22A, the value of the uplink field is 0 because it is a downlink transmission frame for SU.
- the BSS color field represents a value for identifying the BSS.
- the second wireless communication terminal may perform CCA based on the BSS color field value.
- the second wireless communication terminal receiving the SU downlink physical frame may determine whether the value of the partial AID field matches the AID of the second wireless communication terminal.
- the second wireless communication terminal may receive a physical frame.
- the second wireless communication terminal may determine whether the value of the BSS Color field is the same as the color value of the BSS to which it belongs.
- the second wireless communication terminal determines the idle state of the frequency band based on the first reference value when performing the CCA. In the case of a physical frame indicating another color, the second wireless communication terminal determines the idle state of the frequency band by applying the second reference value when performing the CCA. In this case, the second reference value may be greater than or equal to the first reference value. In this way, the second wireless communication terminal preferentially prevents collision with the physical frame transmitted in the BSS including the second wireless communication terminal over the collision with the physical frame transmitted in the BSS not including the second wireless communication terminal.
- the first wireless communication terminal receives the SU downlink physical frame, the CCA is performed through the second reference value without having to compare the BSS color values.
- the SIG-A field included in the physical frame for uplink transmission to SU is the same as the format of the SIG-A field described in FIG. 22 (a) except that the BSS color field is not included and the number of bits in the Partial AID field is different. can do.
- the value of the Uplink field is 1.
- the wireless communication terminal receiving the physical frame for uplink transmission to the SU operates as follows with respect to the CCA. Specifically, when receiving a physical frame for uplink transmission to the SU, the second wireless communication terminal may determine whether the Partial AID field matches the AID of the first wireless communication terminal of the BSS to which it belongs. If the Partial AID field matches the AID of the first wireless communication terminal of the BSS to which it belongs, the second wireless communication terminal may determine whether the frequency band is idle based on the first reference value when performing the CCA. . If the Partial AID field does not match the AID of the first wireless communication terminal of the BSS to which it belongs, the second wireless communication terminal may determine whether the frequency band is idle based on the second reference value when performing the CCA. have.
- the second reference value may be greater than or equal to the first reference value as described above.
- the first wireless communication terminal receives the SU uplink physical frame, if the value of the partial AID field matches the AID of the first wireless communication terminal, the frame reception is continued. If the value of the Partial AID field does not match the AID of the first wireless communication terminal, the first wireless communication terminal may determine whether the frequency band is idle based on the second reference value when performing the CCA.
- the SIG-A field of the physical frame for downlink transmission to the MU may include a plurality of NSTS fields.
- each of the plurality of NSTS fields indicates the number of space-time radio streams transmitted to the second wireless communication terminal included in the group indicated by the GID field.
- the first wireless communication terminal may use up to four space-time radio streams for any one second wireless communication terminal in consideration of the complexity of the communication.
- the first wireless communication terminal transmits data to the plurality of second wireless communication terminals through OFDMA transmission
- the first wireless communication terminal uses up to four space-time radio streams to each of the plurality of second wireless communication terminals.
- MIMO transmission can be performed.
- the NSTS field is a 3-bit field, the case where the values of the NSTS field are 5, 6, and 7 is not used.
- the first wireless communication terminal may signal a bandwidth allocated to the second wireless communication terminal through an unused value of the NSTS field.
- the NSTS field may indicate the number of space-time radio streams transmitted to the second wireless communication terminal corresponding to the NSTS field.
- it may represent that a frequency band is additionally allocated to any one second wireless communication terminal different from the second wireless communication terminal corresponding to the NSTS field according to the NSTS field value.
- the NSTS [k] field divides the entire frequency bandwidth by n and divides the plurality of second wireless communication terminals with a plurality of second wireless communication terminals.
- the NSTS [k] field indicates that n equal to the total frequency bandwidth is additionally allocated to the k + 1 th second wireless communication terminal and any other second wireless communication terminal.
- the NSTS [k] field may indicate that 1/4 of the entire frequency band is further allocated to the first second wireless communication terminal.
- the NSTS [k] field may indicate that 1/4 of the entire frequency band is further allocated to the second second wireless communication terminal.
- the NSTS [k] field may indicate that 1/4 of the entire frequency band is further allocated to the third second wireless communication terminal.
- the Contiguous field indicates that the frequency band is continuous, it may represent that the frequency band is continuously allocated to the remaining second wireless communication terminals except for the K + 1th second wireless communication terminal.
- the plurality of second wireless communication terminals included in the group indicated by the Group ID field includes the first station STA1, the second station STA2, the third station STA3, and the fourth station STA4.
- the NSTS field indicates that the first station STA1 is allocated two space-time radio streams in the sub-frequency band.
- the NSTS field indicates that the second station STA2 is allocated two space-time radio streams in the sub-frequency band.
- the NSTS field indicates that a frequency band is not allocated to the third station STA3.
- the NSTS field indicates that the fourth station STA4 is allocated one space-time radio stream in the sub-frequency band.
- the Contiguous field indicates that the first and third sub-frequency bands are allocated to the first station STA1.
- the NSTS field indicates that a second sub-frequency band is allocated to the second station STA2.
- the NSTS field indicates that a fourth sub-frequency band is allocated to the fourth station STA4.
- the Contiguous field is 1
- the NSTS field indicates that the first and second sub-frequency bands are allocated to the first station STA1.
- the NSTS field indicates that a third sub-frequency band is allocated to the second station STA2.
- the NSTS field indicates that a fourth sub-frequency band is allocated to the fourth station STA4.
- information on the MCS of the signal including data for each of the plurality of second wireless communication terminals is included in the SIG-B field.
- the value of the Uplink field is zero.
- the description of the other fields may be the same as the description of the SIG-A field described with reference to FIG. 22A.
- Operation of the second wireless communication terminal receiving the MU downlink physical frame may be as follows.
- the second wireless communication terminal receiving the MU downlink physical frame may determine whether the value of the partial AID field matches the AID of the second wireless communication terminal.
- the second wireless communication terminal may receive a physical frame.
- the second wireless communication terminal may determine whether the value of the BSS Color field is the same as the color value of the BSS to which it belongs. In the case of a physical frame indicating the same color, the second wireless communication terminal determines the idle state of the frequency band based on the first reference value when performing the CCA.
- the second wireless communication terminal determines the idle state of the frequency band by applying the second reference value when performing the CCA.
- the second reference value may be greater than or equal to the first reference value.
- the second wireless communication terminal preferentially prevents collision with the physical frame transmitted in the BSS including the second wireless communication terminal over the collision with the physical frame transmitted in the BSS not including the second wireless communication terminal.
- the CCA is performed through the second reference value without having to compare the BSS color values.
- each of the four second wireless communication terminals indicated by the Group ID field is assigned a sub-frequency bandwidth equally divided by four of the total frequency bandwidth indicated by the BW field.
- Each of the four second wireless communication terminals indicated by the Group ID field sequentially receives the space-time wireless stream by the number indicated by the NSTS field in each sub-frequency band.
- any one of the plurality of NSTS fields has a value of 0, 5, 6, or 7, the NSTS field having a value of 5, 6, or 7 of the four second wireless communication terminals indicated by the Group ID field. Any one of the second wireless communication terminal corresponding to the stop the reception of the physical frame.
- the entire frequency band is divided into sub-frequency bands with an equal bandwidth, and the other three second wireless communication terminals receive the space-time radio stream transmitted through the sub-frequency bands assigned to each of the three second wireless communication terminals. do.
- the value of the NSTS field is 0, the corresponding sub-frequency band is not used.
- a sub-frequency band is additionally allocated to any one of three second wireless communication terminals.
- the NSTS field indicates that a discontinuous sub-frequency band is allocated to any one second wireless communication terminal while maintaining the order of the NSTS field. Therefore, any one of the second wireless communication terminals receives the space-time wireless stream indicated by the NSTS field through the discontinuous sub-frequency band.
- the Contiguous field is 1
- the NSTS field indicates that a continuous sub-frequency band is allocated to any one second wireless communication terminal.
- any one of the second wireless communication terminals receives the space-time radio stream indicated by the NSTS field on consecutive sub-frequency bands.
- the +1 th and k2 + 1 th second wireless communication terminals stop receiving the physical frame.
- the entire frequency band is divided into sub-frequency bands having an equal bandwidth, and the k1 + 1st and k2 + 1th second wireless communication terminals and the other two second wireless communication terminals are assigned to each of the two second wireless communication terminals.
- the sub-frequency band is additionally added to at least one second wireless communication terminal of the k1 + 1th or k2 + 1th second wireless communication terminals and the other two wireless communication terminals. Is assigned. If the Contiguous field is 1, the NSTS field indicates that two second wireless communication terminals are allocated consecutive sub-frequency bands. Thus, two second wireless communication terminals receive the space-time radio stream indicated by the NSTS field on consecutive sub-frequency bands. When the Contiguous field is 0, the NSTS field indicates that a discontinuous sub-frequency band is allocated to at least one second wireless communication terminal. Thus, one of the two second wireless communication terminals receives the space-time radio stream indicated by the NSTS field on the discontinuous sub-frequency band.
- the k1 + 1th, k2 + 1th, and k3 + 1th second wireless communication terminals of the terminals stop receiving the physical frame.
- the entire frequency band is divided into sub-frequency bands having an equal bandwidth, and any one second wireless communication terminal except for the k1 + 1th, k2 + 1th, and k3 + 1th second wireless communication terminals is one Receives the space-time radio stream transmitted on the sub-frequency band allocated to the second radio communication terminal.
- the NSTS field when the value of the NSTS field is 0, the corresponding sub-frequency band is not used. If the value of the NSTS field is 5, a sub-frequency band is additionally allocated to any one second wireless communication terminal. At this time, when the Contiguous field is 0, a discontinuous sub-frequency band is allocated to any one second wireless communication terminal while maintaining the order of the NSTS field. Therefore, any one of the second wireless communication terminals receives the space-time wireless stream indicated by the NSTS field through the discontinuous sub-frequency band. When the Contiguous field is 1, the NSTS field indicates that a continuous sub-frequency band is allocated to any one second wireless communication terminal.
- any one of the second wireless communication terminals receives the space-time radio stream indicated by the NSTS field on consecutive sub-frequency bands. If the Contiguous field is 0, the NSTS field indicates that a discontinuous sub-frequency band is allocated to any one second wireless communication terminal. Thus, any one of the second wireless communication terminals receives the space-time radio stream indicated by the NSTS field on the discontinuous sub-frequency band.
- the bandwidth of the entire frequency band is equal to or greater than the minimum unit frequency bandwidth
- the first wireless communication terminal transmits OFDMA to a different second wireless communication terminal for each frequency band having the minimum unit frequency bandwidth.
- the first wireless communication terminal transmits a separate SIG-A field for each frequency band having a minimum unit frequency bandwidth.
- the second wireless communication terminal checks the SIG-A field for each frequency band having the minimum unit frequency bandwidth, and performs a data receiving operation within the frequency band allocated to the second wireless communication terminal.
- the second wireless communication terminal In the case of the SIG-A field of the physical frame for the MU described with reference to FIG. 22, a field exists for each information. Therefore, the second wireless communication terminal must search all the fields to find information about the second wireless communication terminal. If the SIG-A field includes independent subfields for each group including a plurality of wireless communication terminals, the second wireless communication terminal needs to search only the subfields corresponding to the group including the second wireless communication terminal. This will be described with reference to FIG. 23.
- FIG. 23 is a view illustrating a format of a SIG-A field including independent subfields for each group including a plurality of wireless communication terminals according to another embodiment of the present invention.
- the SIG-A field may include a field indicating the number of groups to be signaled by the SIG-A field.
- the SIG-A field may include an independent lower field for each second wireless communication terminal.
- the independent lower field includes information on the second wireless communication terminal.
- the information on the second wireless communication terminal may include at least one of the Group ID field, the NSTS field, the Contiguous field, the 20 MHz SIG field, the SHORT GI field, the GI NYSM field, the Coding field, and the LDPC extra field. have.
- the SIG-A field includes a GID Extra field.
- the GID Extra field indicates the number of groups of the second wireless communication terminal to be signaled by the SIG-A field. Specifically, the number of groups of the second wireless communication terminals included in the frequency band indicated by the BW field is indicated.
- the SIG-A field includes a lower field including information about a group for each group of the second wireless communication terminal.
- sub-fields independent for each group included in the SIG-A field include a Group ID field, an NSTS field, a Contiguous field, a 20 MHz SIG field, a SHORT GI field, a GI NYSM field, a Coding field, and an LDPC extra field.
- the SIG-A field varies depending on the value of the GID_extra field. Therefore, the SIG-A field may have a variable length. In a specific embodiment, the value of the GID_extra field may be up to three. When the value of the GID_extra field is 0, the GID_extra field indicates that the SIG-A field signals only one group. When the value of the GID_extra field is 1, 2, or 3, the GID_extra field indicates that the SIG-A field signals 2, 3, or 4 groups, respectively. For example, when the BW field indicates a frequency band of 20 MHz and the value of the GID_extra field is 3, the SIG-A field signals four groups. When each of the four groups includes four second wireless communication terminals, the SIG-A field may signal that each of the sixteen second wireless communication terminals has been allocated the 1.25 MHz sub-frequency band.
- SIG-A field may be the same as the description of the SIG-A field described with reference to FIG. 23.
- FIG. 24 illustrates a configuration of a physical frame including a SIG-A field according to an embodiment of the present invention.
- the second wireless communication terminal belonging to the group is a first station STA_a, a second station STA_b, a third station STA_c, and a fourth station STA_d.
- the BW field indicates an 80 MHz frequency band.
- the full 80 MHz frequency band is divided into 20 MHz sub-frequency bands divided by four total frequency bands.
- the first wireless communication terminal does not transmit data in the third sub-frequency band corresponding to the third station STA_c.
- the first wireless communication terminal transmits one, three, and two space-time radio streams on the first, second, and fourth sub-frequency bands, respectively.
- the first wireless communication terminal also transmits one, four, and two HE-LTF signals on the first, second, and fourth sub-frequency bands, respectively.
- the first station STA_a receives one space-time radio stream on the first sub-frequency band.
- the second station STA_b receives three space-time radio streams on the second sub-frequency band.
- the fourth station STA_d also receives two space-time radio streams on the fourth sub-frequency band.
- the second wireless communication terminal belonging to the group is a first station STA_a, a second station STA_b, a third station STA_c, and a fourth station STA_d.
- the BW field indicates an 80 MHz frequency band.
- the full 80 MHz frequency band is divided into 20 MHz sub-frequency bands divided by four total frequency bands.
- the first wireless communication terminal does not transmit data in the second and third sub-frequency bands corresponding to the second station STA_b and the third station STA_c.
- the first wireless communication terminal transmits three and two space-time radio streams on the first and fourth sub-frequency bands, respectively.
- the first wireless communication terminal transmits four and two HE-LTF signals on the first and fourth sub-frequency bands, respectively.
- the first station STA_a receives three space-time radio streams on the first sub-frequency band.
- the fourth station STA_d also receives two space-time radio streams on the fourth sub-frequency band.
- 25 illustrates a configuration of a physical frame including a SIG-A field according to another embodiment of the present invention.
- the second wireless communication terminal belonging to the group is a first station STA_a, a second station STA_b, a third station STA_c, and a fourth station STA_d.
- the BW field indicates a 40 MHz frequency band.
- the full 40 MHz frequency band is divided into four 10 MHz sub-frequency bands.
- the first wireless communication terminal does not transmit data in the third sub-frequency band corresponding to the third station STA_c.
- the first wireless communication terminal transmits one, three, and two space-time radio streams on the first, second, and fourth sub-frequency bands, respectively.
- the first wireless communication terminal also transmits one, four, and two HE-LTF signals on the first, second, and fourth sub-frequency bands, respectively.
- the first station STA_a receives one space-time radio stream on the first sub-frequency band.
- the second station STA_b receives three space-time radio streams on the second sub-frequency band.
- the fourth station STA_d also receives two space-time radio streams on the fourth sub-frequency band.
- the second wireless communication terminal belonging to the group is a first station STA_a, a second station STA_b, a third station STA_c, and a fourth station STA_d.
- the BW field indicates an 80 MHz frequency band.
- the full 80 MHz frequency band is divided into 20 MHz sub-frequency bands divided by four total frequency bands. Since the value of the Contiguous field is 0 and the value of the NSTS [2] field is 5, the first wireless communication terminal does not transmit data to the third station STA_c.
- the first wireless communication terminal transmits data for the first station STA_a in the third sub-frequency band.
- the first wireless communication terminal transmits one space-time wireless stream on the first and third sub-frequency bands.
- the first wireless communication terminal transmits three space-time radio streams on the second sub-frequency band.
- the first wireless communication terminal also transmits two space-time radio streams on the fourth sub-frequency band.
- the first wireless communication terminal transmits one, four, one and two HE-LTF signals through the first, second, third and fourth sub-frequency bands, respectively.
- the first station STA_a receives one space-time radio stream on the first and third sub-frequency bands.
- the second station STA_b receives three space-time radio streams on the second sub-frequency band.
- the fourth station STA_d also receives two space-time radio streams on the fourth sub-frequency band.
- the second wireless communication terminal belonging to the group is a first station STA_a, a second station STA_b, a third station STA_c, and a fourth station STA_d.
- the BW field indicates an 80 MHz frequency band.
- the full 80 MHz frequency band is divided into 20 MHz sub-frequency bands divided by four total frequency bands. Since the value of the Contiguous field is 1 and the value of the NSTS [2] field is 5, the first wireless communication terminal does not transmit data to the third station STA_c.
- the first wireless communication terminal transmits data for the first station STA_a in the second sub-frequency band.
- the first wireless communication terminal transmits one space-time wireless stream on the first and second sub-frequency bands.
- the first wireless communication terminal also transmits three space-time radio streams on the third sub-frequency band.
- the first wireless communication terminal also transmits two space-time radio streams on the fourth sub-frequency band.
- the first wireless communication terminal transmits one, one, four, and two HE-LTF signals on the first, second, third, and fourth sub-frequency bands, respectively.
- the first station STA_a receives one space-time radio stream on the first and second sub-frequency bands.
- the second station STA_b receives three space-time radio streams on the third sub-frequency band.
- the fourth station STA_d also receives two space-time radio streams on the fourth sub-frequency band.
- the second wireless communication terminal belonging to the group is a first station STA_a, a second station STA_b, a third station STA_c, and a fourth station STA_d.
- the BW field indicates an 80 MHz frequency band.
- the full 80 MHz frequency band is divided into 20 MHz sub-frequency bands divided by four total frequency bands.
- the first wireless communication terminal sends data to the second station STA_b and the third station STA_c. Do not send.
- the first wireless communication terminal transmits three space-time radio streams on the first and second sub-frequency bands.
- the first wireless communication terminal also transmits two space-time radio streams on the third and fourth sub-frequency bands.
- the first wireless communication terminal transmits four, four, two, and two HE-LTF signals on the first, second, third, and fourth sub-frequency bands, respectively.
- the first station STA_a receives three space-time radio streams on the first and second sub-frequency bands.
- the fourth station STA_d also receives two space-time radio streams on the fourth sub-frequency band.
- FIG. 26 illustrates a configuration of a physical frame including a SIG-A field according to another embodiment of the present invention.
- the second wireless communication terminal belonging to the group is a first station STA_a, a second station STA_b, a third station STA_c, and a fourth station STA_d.
- the BW field indicates an 80 MHz frequency band.
- the full 80 MHz frequency band is divided into 20 MHz sub-frequency bands divided by four total frequency bands. Since the value of the Contiguous field is 0 and the value of the NSTS [2] field is 5, the first wireless communication terminal does not transmit data to the third station STA_c.
- the first wireless communication terminal transmits data for the first station STA_a in the third sub-frequency band.
- the first wireless communication terminal transmits one space-time wireless stream on the first and third sub-frequency bands.
- the first wireless communication terminal transmits three space-time radio streams on the second sub-frequency band.
- the first wireless communication terminal also transmits two space-time radio streams on the fourth sub-frequency band.
- the first wireless communication terminal transmits one, four, one and two HE-LTF signals through the first, second, third and fourth sub-frequency bands, respectively.
- the first station STA_a receives one space-time radio stream on the first and third sub-frequency bands.
- the second station STA_b receives three space-time radio streams on the second sub-frequency band.
- the fourth station STA_d also receives two space-time radio streams on the fourth sub-frequency band.
- the first wireless communication terminal since the value of the 20 MHz SIG field is 1, the first wireless communication terminal repeatedly transmits the SIG field for each minimum unit frequency bandwidth.
- the minimum unit frequency bandwidth may be 20 MHz.
- the SIG field may include a SIG-A field and a SIG-B field. Accordingly, the first station STA_a, the second station STA_b, and the fourth station STA_d may acquire the SIG field through any one sub-frequency band through the entire frequency band.
- FIG. 26 (b) is identical to the above-described embodiments, except that the 20MHz SIG field has a value of 1. Therefore, the first wireless communication terminal transmits a different SIG field for each minimum unit frequency bandwidth. Therefore, the second wireless communication terminal finds a sub-frequency band for transmitting the second wireless communication terminal to obtain a SIG field.
- 27 is a ladder diagram illustrating operations of a first wireless communication terminal and a second wireless communication terminal according to an embodiment of the present invention.
- the first wireless communication terminal 400 generates a physical frame including a signaling field and data (S2701).
- the data is data transmitted by the first wireless communication terminal 400 to each of the plurality of second wireless communication terminals 500.
- the plurality of second wireless communication terminals 500 may be divided into a plurality of groups.
- the signaling field may include independent subfields for each of the plurality of groups.
- the signaling field may include a field indicating the number of the plurality of groups.
- the signaling field may have a variable length.
- the maximum number of the plurality of second wireless communication terminals 500 that the group may include may be four. This is because the number of groups included in the signaling field may vary.
- the signaling field may include a plurality of fields indicating an identifier for identifying each of the plurality of groups.
- the signaling field may include information about a sub-frequency band allocated to each of the plurality of second wireless communication terminals 500.
- the information about the sub-frequency band includes information indicating the number of space-time streams, information indicating whether convolutional coding has been applied to data for each of the plurality of second wireless communication terminals 500, and the plurality of second wireless communications.
- Low-density parity-check code (LDPC) coding is applied to data for each terminal 500 to include at least one of information indicating whether additional OFDM symbols are required.
- LDPC Low-density parity-check code
- the bandwidth of the sub-frequency band allocated to each of the plurality of second wireless communication terminals may be equal.
- the bandwidth of the sub-frequency band allocated to each of the plurality of second wireless communication terminals may be uneven.
- the first wireless communication terminal 400 may allocate each of the plurality of second wireless communication terminals 500 a continuous frequency band having uneven frequency bandwidths.
- the first wireless communication terminal 400 may allocate a frequency band to each of the plurality of second wireless communication terminals 500 through the following process. First, the first wireless communication terminal 400 allocates a basic bandwidth by dividing the bandwidth of the frequency band 500 that the first wireless communication terminal 400 can use by the maximum value of the number of the plurality of second wireless communication terminals 500. Get the value. Subsequently, the first wireless communication terminal 400 determines the remaining values excluding the product of the number of the plurality of second wireless communication terminals 500 and the default allocation value in the bandwidth of the frequency band available to the first wireless communication terminal 400. Acquire. The first wireless communication terminal 400 allocates the obtained remaining value to the plurality of second wireless communication terminals 500.
- the first wireless communication terminal may allocate the remaining values obtained based on the size of data to be transmitted to each of the plurality of second wireless communication terminals 500.
- the first wireless communication terminal 400 may allocate the remaining frequency bands as proportional to the size of data to be transmitted to each of the plurality of second wireless communication terminals 500.
- the first wireless communication terminal 400 transmits the frequency band as much as the obtained remaining value to the second wireless communication terminal 500 that will receive the largest data among the plurality of second wireless communication terminals 500. All can be assigned. This can be represented by the following equation.
- BWassign BW / Nmax + BWadd
- BWassign represents a bandwidth of a frequency band allocated to any second wireless communication terminal 500.
- BW represents a bandwidth of a frequency band that can be used by the first wireless communication terminal 400.
- Nmax represents the maximum value of the second wireless communication terminal 500.
- BWadd represents the bandwidth of the frequency band additionally allocated to any second wireless communication terminal 500.
- f (a) represents a function of allocating the remaining frequency band
- n represents the number of the plurality of second wireless communication terminals 500. The function of allocating the remaining frequency band may be allocated to each of the plurality of second wireless communication terminals 500 based on the size of data to be transmitted to each of the plurality of second wireless communication terminals 500 as described above.
- the frequency band allocated to the plurality of second wireless communication terminals 500 may include a main channel of a frequency band usable by the first wireless communication terminal 400. As described above, the first wireless communication terminal 400 can increase the efficiency of the CCA operation of the second wireless communication terminal.
- the signaling field may include a field indicating whether to use orthogonal frequency-division multiple access (OFDMA) transmission.
- OFDMA orthogonal frequency-division multiple access
- the signaling field may include a field indicating whether a sub-frequency band allocated to each of the plurality of second wireless communication terminals 500 is a continuous frequency band.
- the signaling field may include any one of the above-described SIG-A field and SIG-B field.
- the first wireless communication terminal 400 transmits the generated physical frame (S2703).
- the first wireless communication terminal 500 may use a frequency band having a bandwidth greater than or equal to the minimum unit frequency bandwidth, and transmit the first wireless communication terminal 500 signaling field in units of the minimum unit frequency bandwidth.
- the minimum unit frequency bandwidth represents the minimum bandwidth of the frequency band that can be used by the base terminal.
- the first wireless communication terminal 500 may transmit a signaling field including different information in units of a minimum unit frequency bandwidth. Through this, the frequency band utilization efficiency of signaling field transmission can be improved.
- the first wireless communication terminal 500 may simultaneously transmit the same signaling field in units of the minimum unit frequency bandwidth.
- the second wireless communication terminal 500 obtains data transmitted to the second wireless communication terminal 500 based on the signaling field (S2705).
- the second wireless communication terminal 500 may obtain a signaling field from the physical frame.
- the second wireless communication terminal 500 may obtain information on the sub-frequency band allocated to the second wireless communication terminal 500 from the signaling field.
- the second wireless communication terminal 500 may obtain data included in the physical frame based on the information on the sub-frequency band.
- the signaling field may include independent subfields for each of the plurality of groups.
- the second wireless communication terminal 500 may decode a lower field including information on the second wireless communication terminal and stop decoding the remaining lower fields.
- the lower field may include information on a sub-frequency band allocated to the second wireless communication terminal.
- the information on the sub-frequency band includes information about the sub-frequency bandwidth, information indicating the number of space-time streams, information indicating whether convolutional coding has been applied to data for the second wireless communication terminal 500, and Low-density parity-check code (LDPC) coding may be applied to data for the wireless communication terminal 500 to include at least one of information indicating whether additional OFDM symbols are required.
- LDPC Low-density parity-check code
- the present invention has been described using the WLAN communication as an example, the present invention is not limited thereto and may be equally applicable to other communication systems such as cellular communication.
- the methods, apparatus, and systems of the present invention have been described in connection with specific embodiments, some or all of the components, operations of the present invention may be implemented using computer systems having a general purpose hardware architecture.
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Abstract
Description
Claims (20)
- 무선 통신 단말에서,무선 신호를 송수신하는 송수신부; 및상기 무선 통신 단말의 동작을 제어하는 프로세서를 포함하고,상기 송수신부는베이스 무선 통신 단말이 상기 무선 통신 단말을 포함하는 복수의 무선 통신 단말 각각에게 전송하는 데이터를 포함하는 피지컬 프레임로부터 시그널링 필드를 획득하고,상기 시그널링 필드에 기초하여 상기 피지컬 프레임으로부터 상기 베이스 무선 통신 단말이 상기 무선 통신 단말에게 전송하는 데이터를 수신하고,상기 시그널링 필드는 상기 복수의 무선 통신 단말에 대한 정보를 시그널링하고,상기 베이스 무선 통신 단말은 상기 복수의 무선 통신 단말과 다른 어느 하나의 무선 통신 단말인무선 통신 단말.
- 제1항에서,상기 복수의 무선 통신 단말은 복수의 그룹으로 구분되고,상기 시그널링 필드는상기 복수의 그룹 각각 별로 독립된 하위 필드를 포함하는무선 통신 단말.
- 제2항에서,상기 시그널링 필드는상기 복수의 그룹의 개수를 나타내는 필드를 더 포함하는무선 통신 단말.
- 제2항에서,상기 시그널링 필드는상기 복수의 그룹 각각을 식별하는 식별자를 나타내는 복수의 필드를 포함하는무선 통신 단말.
- 제1항에서,상기 시그널링 필드는상기 복수의 무선 통신 단말 각각에게 할당되는 서브-주파수 대역에 관한 정보를 포함하는무선 통신 단말.
- 제5항에서,상기 복수의 무선 통신 단말 각각에게 할당되는 서브-주파수 대역의 대역폭은 균등한무선 통신 단말.
- 제5항에서,상기 시그널링 필드는OFDMA(Orthogonal Frequency-Division Multiple Access)전송 이용 여부를 나타내는 필드를 포함하는무선 통신 단말.
- 제5항에서,상기 시그널링 필드는상기 복수의 무선 통신 단말 각각에 할당된 서브-주파수 대역이 연속한 주파수 대역인지 나타내는 필드를 포함하는무선 통신 단말.
- 제5항에서,상기 서브-주파수 대역에 관한 정보는서브-주파수 대역폭에 관한 정보, space-time 스트림의 숫자를 나타내는 정보, 상기 복수의 무선 통신 단말 각각에 대한 데이터에 컨볼루션 코딩이 적용되었는지를 나타내는 정보, 및 상기 복수의 무선 통신 단말 각각에 대한 데이터에 LDPC(Low-density parity-check code) 코딩이 적용되어 추가 OFDM 심볼이 필요한지 여부를 나타내는 정보 중 적어도 어느 하나를 포함하는무선 통신 단말.
- 제1항에서,상기 복수의 무선 통신 단말에게 할당된 주파수 대역은상기 베이스 무선 통신 단말이 사용할 수 있는 주파수 대역의 주 채널을 포함하는무선 통신 단말.
- 제1항에서,상기 베이스 무선 통신 단말은최소 단위 주파수 대역폭 이상의 대역폭을 갖는 주파수 대역을 사용하고,상기 시그널링 필드는최소 단위 주파수 대역폭 단위로 서로 다른 정보가 전송되는상기 최소 단위 주파수 대역폭은 상기 베이스 단말이 사용할 수 있는 주파수 대역의 최소 대역폭을 나타내는무선 통신 단말.
- 베이스 무선 통신 단말에서,무선 신호를 송수신하는 송수신부; 및상기 무선 통신 단말의 동작을 제어하는 프로세서를 포함하고,상기 송수신부는복수의 무선 통신 단말에게 상기 복수의 무선 통신 단말 각각에게 전송할 데이터와 상기 복수의 무선 통신 단말에 대한 정보를 시그널링하는 시그널링 필드를 포함하는 피지컬 프레임을 전송하고,상기 베이스 무선 통신 단말은 상기 복수의 무선 통신 단말과 다른 어느 하나의 무선 통신 단말인베이스 무선 통신 단말.
- 제12항에서,상기 복수의 무선 통신 단말은 복수의 그룹으로 구분되고,상기 시그널링 필드는상기 복수의 그룹 각각 별로 독립된 하위 필드를 포함하는베이스 무선 통신 단말.
- 제13항에서,상기 시그널링 필드는상기 복수의 그룹의 개수를 나타내는 필드를 더 포함하는베이스 무선 통신 단말.
- 제13항에서,상기 시그널링 필드는상기 복수의 그룹 각각을 식별하는 식별자를 나타내는 복수의 필드를 포함하는베이스 무선 통신 단말.
- 제12항에서,상기 시그널링 필드는상기 복수의 무선 통신 단말 각각에게 할당되는 주파수 대역에 관한 정보를 포함하는베이스 무선 통신 단말.
- 제16항에서,상기 복수의 무선 통신 단말 각각에게 할당되는 서브-주파수 대역의 대역폭은 균등한베이스 무선 통신 단말.
- 제16항에서,상기 시그널링 필드는OFDMA(Orthogonal Frequency-Division Multiple Access)전송 이용 여부를 나타내는 필드를 포함하는베이스 무선 통신 단말.
- 제16항에서,상기 시그널링 필드는상기 복수의 무선 통신 단말 각각에 할당된 서브-주파수 대역이 연속한 주파수 대역인지 나타내는 필드를 포함하는베이스 무선 통신 단말.
- 무선 통신 단말의 동작 방법에서,베이스 무선 통신 단말이 상기 무선 통신 단말을 포함하는 복수의 무선 통신 단말 각각에게 전송하는 데이터를 포함하는 피지컬 프레임로부터 시그널링 필드를 획득하는 단계; 및상기 시그널링 필드에 기초하여 상기 피지컬 프레임으로부터 상기 베이스 무선 통신 단말이 상기 무선 통신 단말에게 전송하는 데이터를 수신하는 단계를 포함하고,상기 시그널링 필드는 상기 복수의 무선 통신 단말에 대한 정보를 시그널링하고,상기 베이스 무선 통신 단말은 상기 복수의 무선 통신 단말과 다른 어느 하나의 무선 통신 단말인동작 방법.
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US20200028724A1 (en) | 2020-01-23 |
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