WO2016003195A1 - 무선 통신 방법 및 무선 통신 단말 - Google Patents
무선 통신 방법 및 무선 통신 단말 Download PDFInfo
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- WO2016003195A1 WO2016003195A1 PCT/KR2015/006770 KR2015006770W WO2016003195A1 WO 2016003195 A1 WO2016003195 A1 WO 2016003195A1 KR 2015006770 W KR2015006770 W KR 2015006770W WO 2016003195 A1 WO2016003195 A1 WO 2016003195A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/04—Scheduled or contention-free access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
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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]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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.
- one embodiment of the present invention is to provide a wireless communication method and a wireless communication terminal that enables data transmission between a station and an AP 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 terminal, wherein the processor collects data to be transmitted to a plurality of terminals, generates an aggregate MAC protocol data unit for simultaneously transmitting data to the plurality of terminals, and sends the data to the plurality of terminals. Send the aggregated MAC protocol data unit.
- the transceiver may transmit a first frame indicating that the aggregate MAC protocol data unit is ready for transmission.
- the first frame may include a plurality of terminal identifiers respectively identifying the plurality of terminals and the number of the plurality of terminals.
- the sort order of the plurality of terminal identifiers may indicate the sort order of channels assigned to the plurality of terminals.
- the transceiver may transmit the first frame through an available channel instead of a main channel and a subchannel extending the main channel.
- the transceiver transmits the first frame through any one channel among a plurality of available channels, and prepares data transmission for one terminal through the available channel instead of the one channel in the plurality of available channels.
- the second frame indicating may be transmitted.
- the transceiver may transmit the aggregated MAC protocol data unit through an available channel instead of a main channel and a subchannel extending the main channel.
- the aggregated MAC protocol data unit may include a plurality of MAC protocol data units, and the first MAC protocol data unit of the plurality of MAC protocol data units may be a header signaling data included in the aggregated MAC protocol data unit. .
- the header may include a group address for identifying a group representing the plurality of terminals.
- the header may include information on a channel used by the wireless communication terminal and a modulation and coding scheme (MCS) of a signal used in the channel.
- MCS modulation and coding scheme
- the header may include user information indicating a relationship between the plurality of MAC protocol data units included in the aggregated MAC protocol data unit and the plurality of terminals.
- Wireless communication terminal includes a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the terminal, wherein the transceiver unit receives an aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals, and the processor is configured to communicate with the wireless communication terminal from the aggregate MAC protocol data unit. Acquire the relevant Mac protocol data unit.
- the transceiver may receive a first frame indicating that the aggregate MAC protocol data unit is ready for transmission.
- the first frame may include a plurality of terminal identifiers respectively identifying the plurality of terminals and the number of the plurality of terminals.
- the sorting order of the plurality of terminal identifiers indicates the sorting order of channels assigned to the plurality of terminals, and the processor determines a channel allocated to the wireless communication terminal based on the sorting order of the plurality of terminal identifiers,
- the transceiver may transmit a control frame to a wireless communication terminal that transmits the aggregated MAC protocol data unit through a channel allocated to the wireless communication terminal.
- the sorting order of the plurality of terminal identifiers indicates a transmission order between the plurality of terminals transmitting a control frame to a wireless communication terminal transmitting the aggregated MAC protocol data unit, and the processor is in a sorting order of the plurality of terminal identifiers.
- the transmission order may be determined based on the plurality of terminals, and the transceiver may transmit the control frame to a wireless communication terminal that transmits the aggregated MAC protocol data unit through a channel allocated to the wireless communication terminal.
- the plurality of terminals may transmit the control frame through one designated channel.
- the control frame may be a frame indicating that data transmission is possible.
- the processor may obtain information on a modulation and coding scheme (MCS) of a channel used by the wireless communication terminal and a signal used in the channel based on the aggregated MAC protocol data unit.
- MCS modulation and coding scheme
- a method of operating a wireless communication terminal comprising: collecting data to be transmitted to a plurality of terminals; Generating an aggregate MAC protocol data unit for simultaneously transmitting data to the plurality of terminals; And sending the aggregated MAC protocol data unit.
- One embodiment of the present invention provides an efficient wireless communication method and a wireless communication terminal.
- one embodiment of the present invention provides a wireless communication method and a wireless communication terminal that enable data transmission simultaneously between an access point and a plurality of stations.
- FIG. 1 shows 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 illustrates a header of an aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals according to an embodiment of the present invention.
- FIG. 7 illustrates allocation of a primary channel and a subchannel to a plurality of terminals to transmit an aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals according to an embodiment of the present invention.
- 8 through 11 illustrate that an access point transmits data to a plurality of stations through an aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals according to an embodiment of the present invention.
- FIG. 12 shows a structure of a frame indicating that simultaneous data transmission is prepared for a plurality of stations when data is simultaneously transmitted to a plurality of terminals according to another embodiment of the present invention.
- 13 through 20 illustrate that an access point simultaneously transmits data to multiple stations through a frame indicating preparation for simultaneous data transmission for multiple stations according to another embodiment of the present invention.
- 21 to 23 show that an access point simultaneously transmits data to a plurality of stations without a frame transmission indicating preparation for data transmission according to another embodiment of the present invention.
- FIG. 24 is a ladder diagram illustrating an operation of a terminal simultaneously transmitting data to a plurality of other terminals 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 includes 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 a station associated with it.
- 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.
- 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 the 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 the embodiment, some components of the station 100, for example, a control unit for individually controlling the transceiver unit 120 and the like. You can also point it.
- the processor 110 controls various operations of radio 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 shown in FIG. 3 is a block diagram according to an embodiment of the present invention, in which blocks shown separately represent logically distinguishing elements of a device. 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 showing the configuration of an AP 200 according to an embodiment of the present invention.
- 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, such as 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.
- any one terminal may simultaneously transmit data to a plurality of terminals.
- the frequency channel that can be used by the terminal for transmitting data is limited. Therefore, a terminal transmitting data should efficiently allocate available frequency channels and transmit data.
- the size of data transmitted by the terminal transmitting data to the plurality of terminals at the same time may all be different. Therefore, allocating frequency channels of the same size to all of the UEs receiving the data may be inefficient.
- the terminal transmitting the data may use the available frequencies without waste.
- the terminal transmitting the data does not have to perform a complicated operation of allocating an available frequency channel to each terminal for receiving the data. Accordingly, there is a need for a data transmission method through an aggregated MAC protocol data unit in which a plurality of MAC protocol data units including data to be transmitted to a plurality of terminals are aggregated.
- the aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals is different from an aggregate-Mac protocol data unit (A-MPDU) that aggregates and transmits MPDUs to be transmitted to the same address. Therefore, an aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals is referred to as a multi-terminal A-MPDU or a multi-station A-MPDU.
- a terminal that simultaneously transmits data to a plurality of terminals using OFDMA is referred to as a transmitting terminal, and each of a plurality of terminals that simultaneously receive data using OFDMA is referred to as a receiving terminal.
- the data transmitted by the transmitting terminal and received by the receiving terminal are referred to as a plurality of terminal data.
- the transmitting terminal may simultaneously transmit different data corresponding to each receiving terminal to each of the plurality of receiving terminals.
- the multi-terminal data may be the multi-terminal A-MPDU described above.
- the transmitting terminal may be an access point.
- the receiving terminal may be a station associated with the access point.
- FIG. 6 illustrates a header of an aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals according to an embodiment of the present invention.
- the plurality of terminal data may include a header signaling data included in the plurality of terminal data.
- the plurality of terminal A-MPDUs may include a plurality of Mac protocol data units (MPDUs) to be transmitted to the plurality of terminals.
- the multiple terminal A-MPDU may include a header for signaling data included in the multiple terminal A-MPDU.
- the header of the multiple terminal A-MPDU may be one MPDU.
- such a header may be located at the beginning of the multiple terminal A-MPDU. Accordingly, the receiving terminal may acquire information about data included in the plurality of terminal A-MPDUs by obtaining the first MPDU included in the plurality of terminal A-MPDUs.
- the header of the plurality of terminal data may be transmitted in a predetermined modulation and coding scheme (MCS).
- MCS modulation and coding scheme
- the receiving terminal can receive the information on the multiple terminal data signaled by the header by decoding the header with a predetermined MCS without additional information. For example, if the header is designated to be transmitted in BPSK 1/2 and the header is one MPDU located in the first of the multiple terminal A-MPDUs, the receiving terminal sets the MCS to BPSK 1/2 and the first of the multiple terminal A-MPDUs.
- the header may be obtained by decoding the MPDU.
- the header of the plurality of terminal data may include a group address for identifying a group representing the plurality of receiving terminals.
- the receiving terminal may receive multiple terminal data based on the group address.
- the group address may be an identifier indicating addresses of a plurality of terminals that receive a signal using OFDMA.
- the group identifier may be referred to as an OFDMA group address.
- the header of the plurality of terminal data may include information on the channel and MCS of the signal used in the channel.
- the header of the plurality of terminal data may include information about a channel used by the transmitting terminal.
- the header of the plurality of terminal data may include information about a channel that is not allocated because the terminal and the other terminal is in use.
- the header of the plurality of terminal data may include information about a channel for transmitting a signal to the same MCS. Therefore, the receiving terminal can receive the plurality of terminal data based on the information on the channel and the MCS of the signal used for the channel.
- the header may include a terminal identifier for identifying the receiving terminal. In this case, the terminal identifier may be an identifier for identifying the station.
- the terminal identifier may be an association ID (AID) that is assigned from the AP in an association process between the STA and the AP and identifies a connection between the STA and the AP.
- the terminal identifier may be a short-connection identifier (Short-AID, S-AID) simply made using only the lower 8 bits of the connection identifier.
- the header of the plurality of terminal data may include user information indicating a relationship between the data included in the plurality of terminal data and the plurality of receiving terminals.
- the user information may include the number of receiving terminals.
- the user information may include a sorting order of the MPDU including data corresponding to the receiving terminal.
- the sort order of the terminal identifiers included in the header of the plurality of terminal data may indicate the sort order of data corresponding to the terminal indicated by the terminal identifier among the plurality of data included in the plurality of terminal data. For example, if the header includes information on the terminal identifier in order of the terminal identifier for the first terminal and the terminal identifier for the second terminal, the data for the first terminal is first located in the plurality of terminal data and then the second terminal is located in the second terminal. Data may be located.
- the user information may include an identifier of the terminal and offset information indicating a location of data including data about the terminal.
- the receiving terminal may extract data related to the receiving terminal from the plurality of terminal data based on the relationship between the plurality of data included in the plurality of terminal data and the plurality of terminals to receive the plurality of terminal data.
- the S-AID is used as the terminal identifier
- the S-AIDs for the different terminals may match.
- the receiving terminal extracts data corresponding to its S-AID from the plurality of terminal data, and then checks whether the data about itself is correct through a header included in the data.
- the syntax of the header of the plurality of terminal data may be a modification of the syntax of the MPDU of the existing 802.11ac standard as illustrated in FIG. 6.
- the first address field Address 1 may indicate the group identifier described above.
- the reserved bit field which is the first bit of the HT control middle field, may indicate that the corresponding MPDU is a header of a plurality of terminal data.
- the reserved bit field may represent that transmission information (OFDMA control) for a plurality of terminals including a variable length allocation bitmap and a user indication is included.
- the reserved bit may be referred to as an OFDMA control bit.
- a body field including data transmitted by the MPDU may include information signaling a plurality of terminal data.
- the Body field including data transmitted by the MPDU may include an allocation bitmap field indicating information on a channel and MCS of a signal used in the channel.
- the Allocation Bitmap field may be divided into a plurality of channel (CH) fields, and each of the plurality of CH fields may represent an MCS of a signal used in a corresponding channel.
- each of the plurality of CH fields may include index information indicating an MCS of a signal used in a channel. At this time, the index information may indicate that the other terminal is currently used and cannot be used.
- the Allocation Bitmap field may be a 4-byte field.
- each CH field is a 4-bit field
- the Allocation Bitmap field may include eight CH fields.
- the transmitting terminal may transmit a plurality of terminal data to a plurality of terminals at the same time through a channel through which a signal having the same MCS is transmitted.
- the transmitting terminal may transmit one plurality of terminal data through a plurality of channels through which a signal having the same MCS is transmitted.
- the index information may be the same as the MCS index information of FIG. 6. For example, if the eight CH fields included in the Allocation Bitmap field have values of 0001, 0001, 0001, 0011, 0011, 1111, 1111, 0101, respectively, the transmitting terminal QPSK through CH 1, CH 2, and CH 3.
- the transmitting terminal modulates the signal in 1/2 to transmit one multi-terminal A-MPDU.
- the transmitting terminal modulates the signal to QPSK 3/4 through CH 4 and CH 5 and transmits one A-MPDU.
- CH 6 and CH 7 indicates that the busy channel is used by another terminal.
- the transmitting terminal modulates the signal to 64-QAM 2/3 through CH 8 and transmits multiple terminal A-MPDUs.
- the body field may include a user indication field indicating a relationship between a plurality of data included in the plurality of terminal data and a plurality of receiving terminals.
- the User Indication field may include a user field (#User) indicating the total number of terminals to receive the plurality of terminal data and a field indicating a terminal identifier identifying the terminal.
- the sort order of the terminal identifier may indicate the sort order of data corresponding to the terminal indicated by the terminal identifier among the plurality of data included in the plurality of terminal data.
- the terminal identifier may be an association ID (AID) that is assigned from the AP during an association process between the STA and the AP and identifies a connection between the STA and the AP.
- the terminal identifier may be a short-connection identifier (Short-AID, S-AID) simply made using only the lower 8 bits of the connection identifier.
- the header of the plurality of terminal data may be referred to as an OFDMA header.
- the aforementioned group identifier may be an identifier indicating addresses of a plurality of terminals receiving a signal using OFDMA.
- the group identifier may be referred to as an OFDMA group address.
- FIG. 7 illustrates allocation of a primary channel and a subchannel to a plurality of terminals to transmit an aggregate MAC protocol data unit for simultaneously transmitting data to a plurality of terminals according to an embodiment of the present invention.
- the transmitting terminal may perform OFDMA transmission for simultaneously transmitting data to a plurality of terminals through a channel through which a signal having the same MCS is transmitted.
- the transmitting terminal may transmit one terminal data through a plurality of frequency channels through which a signal using the same MCS is transmitted.
- the transmitting terminal may transmit the plurality of terminal data using all available frequency channels.
- the transmitting terminal may transmit a signal including information related to data encoding after transmitting the preamble of the radio signal.
- Information related to data encoding may include an MCS.
- the transmitting terminal may transmit a signal including information related to data encoding in units of 20 MHz. This signal is referred to as AX-SIG.
- the receiving terminal may receive the plurality of terminal A-MPDUs based on the AX-SIG.
- the receiving terminal may determine a channel through which a signal using the same MCS is transmitted as a channel through which a plurality of terminal data is transmitted.
- the receiving terminal may determine that the channel in which the preamble and the AX-SIG are not detected is a channel that is not allocated to the terminal. Accordingly, the receiving terminal may exclude the preamble and the channel on which the AX-SIG is not detected when decoding.
- the transmitting terminal may transmit information related to data encoding in a header of the multiple terminal multi-terminal data.
- the receiving terminal may obtain information related to data encoding based on the header of the plurality of terminal data.
- the receiving terminal may obtain information about the MCS based on the header of the plurality of terminal data.
- the receiving terminal may obtain information about an unallocated channel based on the header of the plurality of terminal data.
- the receiving terminal may obtain information related to data encoding based on the channel included in the header of the plurality of terminal data and the information about the MCS of the signal transmitted in the channel.
- the receiving terminal may obtain information related to data encoding based on an Allocation Bitmap field included in a header of the plurality of terminal data.
- the plurality of terminal data may be a plurality of terminal A-MPDUs.
- a signal using the same MCS is transmitted in a primary channel, a first subchannel (Secondary CH # 1), and a third subchannel (Secondary CH # 3).
- a signal using the same MCS is transmitted on the fifth subchannel (Secondary CH # 5), the sixth subchannel (Secondary CH # 6), and the seventh subchannel (Secondary CH # 7).
- the header of the plurality of terminal A-MPDUs is first transmitted among the data included in the plurality of terminal A-MPDUs.
- the receiving terminal may extract the first MPDU included in the plurality of terminal A-MPDUs to obtain information about the plurality of MPDUs included in the plurality of terminal A-MPDUs.
- the receiving terminal may extract the first MPDU included in the plurality of terminal A-MPDUs to obtain information about the channel and the MCS used by the signal transmitted on the channel.
- the receiving terminal can know the information about the position of the MPDU including the data about itself. Through this, the receiving terminal can know whether the data included in the MPDU is related to itself without decoding the header of the MPDU.
- the S-AID is used as the terminal identifier as described above, the S-AIDs for the different terminals may be the same. In this case, the receiving terminal may decode the header of the MPDU to determine whether it contains data about itself.
- 8 through 11 illustrate that an access point transmits data to a plurality of stations through an aggregate MAC protocol data unit for simultaneously transmitting data to a terminal according to an embodiment of the present invention.
- the transmitting terminal may transmit the plurality of terminal data using only a subchannel instead of a main channel in consideration of compatibility with a legacy terminal using a conventional technology.
- the transmitting terminal may transmit the plurality of terminal data using a subchannel other than the subchannel extending the main channel among the plurality of subchannels.
- a terminal using a conventional technology such as 802.11ac transmits data only through an extended channel in which a main channel or a main channel and a subchannel are connected.
- the transmitting terminal may collect data to be transmitted for a predetermined time. This certain time may be referred to as a data accumulator timer. In this case, the transmitting terminal may wait without transmitting data even if the channel is in an idle state during the data accumulation timer. After collecting the data to be transmitted, the transmitting terminal secures a channel to transmit according to a contention method. In more detail, when a channel is idle for a predetermined time, the transmitting terminal transmits a ready to send (RTS) frame, which is a frame indicating that data is ready for data transmission after waiting for a contention window value, to a plurality of channels.
- the predetermined time may be a distributed inter-frame space (DIFS) defined in the 802.11 standard.
- DIFS distributed inter-frame space
- the transmitting terminal may transmit the RTS frame for the conventional terminal through the main channel, and the RTS frame for the terminal supporting the embodiment of the present invention through the subchannel rather than the main channel.
- the transmitting terminal transmits an RTS frame for the conventional terminal through a main channel and a subchannel extending the main channel, and the RTS frame for the terminal supporting the embodiment of the present invention extends a main channel among a plurality of subchannels. It can be transmitted through subchannels rather than subchannels.
- the receiving terminal may receive a signal transmitted in all channels.
- the receiving terminal may determine whether its address is the same as the receiver address (RA) of the RTS frame.
- RA receiver address
- Receiving terminal receiving the RTS frame if its address is the same as the Receiver Address (RA) of the RTS frame, it is possible to transmit data after a certain time from the time when the RTS frame is transmitted in response to the received RTS frame.
- a CTS (Clear To Send) frame may be transmitted.
- the predetermined time may be a short inter-frame space (SIFS).
- the transmitting terminal transmits data to the plurality of terminals after a predetermined time from the CTS frame in response to the CTS frame.
- the predetermined time may be SIFS.
- the transmitting terminal may transmit data on the conventional terminal through the primary channel, and may transmit data on the terminal supporting the embodiment of the present invention as a plurality of terminal data through the subchannel.
- the transmitting terminal may transmit data for the conventional terminal through a main channel and a subchannel extending the main channel.
- the transmitting terminal may transmit the data for the terminal supporting the embodiment of the present invention to the plurality of terminal data through the subchannel rather than the subchannel extending the main channel among the plurality of subchannels.
- the transmitting terminal may transmit data about a terminal supporting an embodiment of the present invention as a plurality of terminal data through a plurality of subchannels rather than a subchannel extending a main channel among a plurality of subchannels.
- the plurality of terminal data may be a plurality of terminal A-MPDUs.
- the transmitting terminal may determine whether the channel is idle for a predetermined time before transmitting data to determine whether the channel is available.
- the predetermined time may be point inter-frame space (PIFS).
- the transmitting terminal may transmit data through the corresponding channel.
- the receiving terminal receiving the data may transmit an ACK frame indicating completion of data reception.
- the transmitting terminal may determine the channel state again and transmit the data. In this case, the transmitting terminal may resume the multiple terminal data transmission procedure by transmitting the RTS frame after a predetermined time after transmitting the ACK frame.
- a channel to be transmitted is secured according to a competition method.
- the transmitting terminal transmits a ready to send (RTS) frame, which is a frame indicating that the data is ready for data transmission after waiting by a contention window value, to the plurality of channels.
- RTS ready to send
- the predetermined time may be a distributed inter-frame space (DIFS) defined in the 802.11 standard.
- FIG. 8 shows transmission of a multi-terminal A-MPDU through only subchannels, not main channels, according to an embodiment of the present invention.
- RTS1 an RTS frame received by the first station
- CTS1 a CTS frame transmitted by the first station
- the transmitting terminal is an access point.
- a terminal receiving data from a terminal transmitting a plurality of terminals A-MPDU is a first station, a second station, a third station, a fourth station, a fifth station, a sixth station, a seventh station, and an eighth station.
- the third station and the fifth station are conventional terminals that do not support the embodiment of the present invention.
- the access point transmits data through the primary channel to third and fifth stations that do not support the embodiment of the present invention.
- the access point transmits an RTS frame through a primary channel to a third station that does not support the embodiment of the present invention.
- the access point receives a CTS frame from the third station on the primary channel.
- the access point transmits data to the third station through the primary channel. After the transmission for the third station is completed, the access point transmits an RTS frame to the fifth station on the primary channel. The access point then receives a CTS frame from the fifth station on the primary channel. The access point transmits data to the fifth station through the primary channel.
- the access point uses multiple subchannels A- to the first station, the second station, the fourth station, the sixth station, the seventh station, and the eighth station using an available subchannel to support an embodiment of the present invention. Send the MPDU.
- the access point transmits a plurality of terminal A-MPDUs including data about the first station and the second station through the first subchannel Secondary Channel #Secodnar CH # 2.
- the access point transmits an RTS frame to the first station and the second station supporting the embodiment of the present invention through a first subchannel (Secondary CH # 1) and a second subchannel (Secodnar CH # 2). Thereafter, the access point receives the CTS frame through the first subchannel Secondary CH # 1 and the second subchannel Secodnar CH # 2.
- the access point includes a plurality of terminals A including data about the first station and the second station to the first station and the second station through the first subchannel (Secondary CH # 1) and the second subchannel (Secodnar CH # 2). Send MPDU.
- the access point transmits a plurality of terminal A-MPDUs to a fourth station through a fourth subchannel (Secondary CH # 4).
- the access point re-determines an available channel to transmit data for the seventh and eighth stations.
- the access point includes a plurality of terminals A including data about the seventh station and the eighth station to the seventh and eighth stations through the second subchannel (Secondary # 2) and the third subchannel (Secondary # 3). Send MPDU.
- FIG. 9 illustrates a plurality of UE A-MPDU transmissions on a subchannel rather than a subchannel extending a main channel among a plurality of subchannels according to an embodiment of the present invention.
- the transmitting terminal is an access point.
- a terminal receiving data from a terminal transmitting a plurality of terminal A-MPDUs is a first station, a second station, a third station, a fourth station, a fifth station, a sixth station, and a seventh station.
- the third station and the fifth station are conventional terminals that do not support the embodiment of the present invention.
- the access point transmits data to the third and fifth stations that do not support the embodiment of the present invention through the first subchannel (Secondary CH # 1) extending the primary channel and the primary channel. send.
- the access point transmits an RTS frame to a third station that does not support an embodiment of the present invention through a primary channel and a first subchannel (Secondary CH # 1). Thereafter, the access point receives the CTS frame from the third station through the primary channel and the first subchannel (Secondary CH # 1). In addition, the access point transmits data to the third station through the primary channel (primary CH) and the first sub-channel (Secondary CH # 1). After the data transmission to the third station is completed, the access point transmits an RTS frame to the fifth station through the primary channel (primary CH) and the first subchannel (Secondary CH # 1).
- the access point receives the CTS frame from the fifth station through the primary channel and the first subchannel (Secondary CH # 1).
- the access point transmits data to the fifth station through the primary channel (primary CH) and the first sub-channel (Secondary CH # 1).
- the access point also transmits multiple terminal A-MPDUs using subchannels available to the first station, second station, fourth station, sixth station, and seventh station supporting the embodiments of the present invention. .
- the access point transmits a plurality of terminal A-MPDUs including data for the first station through a second subchannel (Secondary CH # 2).
- the access point transmits an RTS frame to a first station supporting an embodiment of the present invention through a second subchannel (Secondary CH # 2). Thereafter, the access point receives the CTS frame from the first station through the second subchannel (Secondary CH # 2). The access point transmits a plurality of terminal A-MPDUs including data for the second station to the second station through the second subchannel (Secondary CH # 2). In addition, the access point transmits the plurality of terminal A-MPDUs to the second station through the fourth subchannel (Secondary CH # 4). The access point determines the available channel again after the data transmission to the first station and the second station is completed, and transmits data for the fourth station, the sixth station, and the seventh station.
- the access point transmits information about the fourth station, the sixth station, and the seventh station through the second subchannel (Secondary # 2), the third subchannel (Secondary # 3), and the fourth subchannel (Secondary # 3). Transmit the multiple terminal A-MPDU.
- FIG. 10 shows that in one embodiment of the present invention, a channel for transmitting a plurality of terminal A-MPDUs can be dynamically extended according to available channels.
- the transmitting terminal is an access point.
- the terminal receiving the data from the transmitting terminal is a first station, a second station, a third station, a fourth station, a fifth station, a sixth station, and a seventh station.
- the third station and the fifth station are conventional terminals that do not support the embodiment of the present invention.
- the access point transmits to the fifth station through the first subchannel (Secondary CH # 1) extending the primary channel and the primary channel to a third station that does not support the embodiment of the present invention. Data is transmitted through the primary channel.
- the access point transmits an RTS frame to a third station that does not support an embodiment of the present invention through a primary channel and a first subchannel (Secondary CH # 1). Thereafter, the access point receives the CTS frame from the third station through the primary channel and the first subchannel (Secondary CH # 1). The access point transmits data to the third station through the primary channel and the first subchannel (Secondary CH # 1). The access point transmits the RTS frame to the fifth station through the primary channel. The access point then receives a CTS frame from the fifth station on the primary channel. The access point transmits data to the fifth station through the primary channel.
- the access point transmits a plurality of terminal A-MPDUs to the first station, the second station, the fourth station, the sixth station, and the seventh station supporting an embodiment of the present invention using an available subchannel. .
- the access point transmits a plurality of terminal A-MPDUs including data for the second station to the second station through the second subchannel (Secondary CH # 2).
- the access point transmits an RTS frame to a first station supporting an embodiment of the present invention through a second subchannel (Secondary CH # 2). Thereafter, the access point receives the CTS frame from the first station through the second subchannel (Secondary CH # 2).
- the access point transmits a plurality of terminal A-MPDUs including data for the first station to the first station through a second subchannel (Secondary CH # 2). In addition, the access point transmits a plurality of terminal A-MPDUs including data for the second station to the second station through the fourth subchannel (Secondary CH # 4). After the data transmission to the first station and the second station is completed, the access point re-determines the available channel to transmit data for the fourth station, the sixth station, and the seventh station.
- the access point may use a first subchannel (Secondary # 1), a second subchannel (Secondary # 2), a third subchannel (Secondary # 3), and a fourth subchannel (Secondary # 3) available when transmitting an RTS frame. Transmits a plurality of terminal A-MPDUs for the fourth station, the sixth station, and the seventh station. Specifically, when transmitting data for the fourth station, the sixth station, and the seventh station, the access point re-confirms an available channel to transmit an RTS frame and receives a CTS frame. After receiving the CTS frame, the access point transmits the multiple terminal A-MPDUs on the available channel. As described above, the AP may determine that the channel is available when the channel is idle during PIFS.
- FIG. 11 shows that a channel for transmitting a plurality of terminal A-MPDUs can be dynamically changed according to available channels.
- the transmitting terminal is an access point.
- a terminal receiving data from a transmitting terminal includes a first station, a second station, a third station, a fourth station, a fifth station, a sixth station, a seventh station, an eighth station, a ninth station, and a tenth station. to be.
- the access point uses a primary channel and a plurality of subchannels available to the first station, the second station, and the third station, the fourth station, the fifth station, the sixth station, and the seventh station. Transmit the multiple terminal A-MPDU.
- the access point includes a primary channel, a first subchannel (Secondary CH # 1), a second subchannel (Secondary CH # 2), a fourth subchannel (Secondary CH # 4), and a fifth subchannel ( A first station, a second station, and a third station, a fourth station, a fifth station, through a secondary CH # 5), a sixth subchannel (Secondary CH # 6), and a seventh subchannel (Secondary CH # 7).
- a plurality of terminal A-MPDUs are transmitted to the sixth station and the seventh station.
- the access point includes a primary channel, a first subchannel (Secondary CH # 1), a second subchannel (Secondary CH # 2), a fourth subchannel (Secondary CH # 4), and a fifth subchannel ( The first station, the second station, the third station, the fourth station, the fifth station, and the fifth through the secondary CH # 5), the sixth subchannel (Secondary CH # 6), and the seventh subchannel (Secondary CH # 7). 6 stations, the RTS frame is transmitted to the seventh station.
- the access point includes a primary CH, a first subchannel (Secondary CH # 1), a second subchannel (Secondary CH # 2), a fourth subchannel (Secondary CH # 4), and a fifth subchannel (Secondary CH # 2). # 5), the first station, the second station, the third station, the fourth station, the fifth station, and the sixth station through the sixth subchannel (Secondary CH # 6) and the seventh subchannel (Secondary CH # 7). Receive the CTS frame from the seventh station.
- the access point includes a primary CH, a first subchannel (Secondary CH # 1), a second subchannel (Secondary CH # 2), a fourth subchannel (Secondary CH # 4), and a fifth subchannel (Secondary CH # 2). # 5), the first station, the second station, the third station, the fourth station, the fifth station, and the sixth station through the sixth subchannel (Secondary CH # 6) and the seventh subchannel (Secondary CH # 7). And transmits the multiple terminal A-MPDUs to the seventh station. At this time, the access point may transmit a plurality of terminal A-MPDUs divided into two.
- a plurality of terminal A-MPDUs including data for an access point first station, a second station, and a third station may be included in a primary channel, a first subchannel (Secondary CH # 1), and a second subchannel.
- the access point determines the available channel again after the transmission of data for the first station, the second station, the third station, the fourth station, the fifth station, the sixth station, and the seventh station is completed, to determine the eighth station and the ninth station.
- Send data for the station and the tenth station Specifically, the access point determines available channels before transmitting the RTS frame. As described above, the access point may determine that the channel is available when the channel is idle for the PIFS time.
- the access point transmits a plurality of terminal A-MPDUs for the eighth station and the ninth station through the primary channel and the first subchannel (Secondary # 1).
- the access point determines that the third subchannel (Secondary # 3) that was not available when the multi-terminal A-MPDU is initially transmitted is available, and thus includes a plurality of terminal A- containing data for the tenth station through the third subchannel. Send the MPDU.
- the third subchannel Secondary # 3
- the transmitting terminal secures a channel for transmitting the plurality of terminal data using a conventional RTS frame and transmits the plurality of terminal data.
- the receiving terminal transmits data only when the transmitting terminal transmits an RTS frame by the number of receiving terminals.
- the receiving terminals have a problem in that they do not know general data or whether they receive general data. Therefore, there is a need for a new type of frame indicating that the terminal is ready to transmit data. This will be described with reference to FIGS. 12 to 20.
- FIG. 12 illustrates a structure of a frame indicating that the terminal is ready to transmit data when data is simultaneously transmitted to a plurality of terminals according to another embodiment of the present invention.
- a frame indicating preparation for transmission of a plurality of terminal data is referred to as an Aggregation-RTS (A-RTS) frame.
- the A-RTS frame may include a terminal identifier field indicating a terminal identifier for identifying a receiving terminal.
- the terminal identifier field may indicate an address of the terminal.
- the terminal identifier field may indicate an association ID (AID) allocated in an association process between the terminal and the terminal.
- the A-RTS frame may include the number of terminals indicating the number of receiving terminals.
- the A-RTS frame may include information of a channel to be used by the receiving terminal.
- the sorting order of the terminal identifiers may indicate the sorting order of channels allocated to the terminal indicated by the terminal identifier.
- the receiving terminal may transmit the CTS frame through the assigned channel.
- the receiving terminal may transmit the ACK frame through the assigned channel. For example, if an identifier indicating a first station is located in a terminal identifier field, followed by an identifier indicating a second station, the first station transmits a CTS frame and an ACK frame using the primary channel, and the second station transmits the first station.
- One subchannel may transmit a CTS frame and an ACK frame.
- the A-RTS frame may include a field indicating a relationship between the MPDU included in the plurality of terminal data and the receiving terminal.
- the arrangement order of the terminal identifier indicated by the terminal identifier field of the A-RTS frame may indicate an arrangement order of data corresponding to the terminal indicated by the terminal identifier among a plurality of data included in the plurality of terminal data.
- the arrangement order of the terminal identifier indicated by the terminal identifier field of the A-RTS frame may indicate the arrangement order of the MPDUs corresponding to the terminal indicated by the terminal identifier among the plurality of MPDUs included in the plurality of terminal A-MPDUs.
- the terminal identifier field of the A-RTS frame includes the terminal identifier in the order of the terminal identifier for the first terminal and the terminal identifier for the second terminal
- the terminal includes the data for the first terminal in the multiple terminal A-MPDU.
- the MPDU may be located first and then the MPDU for the second terminal may be located.
- the A-RTS frame may include an identifier of a terminal and offset information indicating a location of data corresponding to the terminal. For example, when the offset information for the first terminal indicates 0 bytes and the offset information for the second terminal indicates 12 bytes, the MPDU including data about the second terminal 12 bytes after the header of the multi-terminal A-MPDU Can be located.
- the A-RTS frame may include a duration field indicating a value for updating a value of a network allocation vector (NAV) like a general MAC frame.
- the value of the duration field may be determined based on the transmission time of the A-RTS frame and the transmission time of the plurality of terminal data.
- the value of the duration field may be the sum of transmission time of A-RTS frame, transmission time of SIFS, CTS frame, SIFS, multi-terminal data transmission time, SIFS, transmission time of ACK frame.
- A-RTS frame may be implemented in consideration of compatibility with the conventional terminal that does not support the embodiment of the present invention.
- a conventional RTS frame has a frame control field indicating information on frame control, a duration field indicating a value for updating a NAV value, an RA field indicating an address of a terminal receiving data, and transmitting data.
- TA field indicating the address of the terminal, and the FCS field including a cyclical redundancy check (CRC) value for error detection.
- the TA field may be an address of a terminal transmitting the plurality of terminal data.
- the address may be an address of an access point transmitting the plurality of terminal data.
- the A-RTS frame may insert additional information after the FCS field of the conventional RTS frame.
- the conventional terminal decodes up to the FCS field and does not decode data included in the remaining A-RTS frames.
- the value of the duration field may be determined based on the A-RTS transmission time and the multiple terminal data transmission time as described above.
- the conventional terminal updates the NAV value to the value indicated by the duration field. Therefore, the conventional terminal does not transmit data until the transmission of the plurality of terminal data is finished.
- a group identifier for identifying a group representing a plurality of terminals to receive the plurality of terminal A-RTSs may be inserted into the existing RA field.
- the group identifier may be the same as the group identifier indicating the plurality of terminals receiving the plurality of terminal data or the plurality of terminals receiving the OFDMA signal described above.
- the terminal supporting the embodiment of the present invention can know the A-RTS frame when the value of the existing RA field indicates the group identifier. Therefore, the terminal supporting the embodiment of the present invention can decode up to a field after the conventional FCS field.
- the structure of the A-RTS frame may be as shown in FIG. 12.
- the A-RTS frame includes a Number of STAs field indicating the number of receiving terminals after the conventional FCS field, a terminal identifier field indicating a terminal identifier identifying a terminal receiving an A-MPDU, and an error detection. It may include additional FCS fields.
- the terminal identifier field may be divided into as many subfields as the number indicated by the number field of the terminal.
- the terminal identifier field may indicate an address of the terminal.
- the terminal identifier field may indicate an association identifier (AID) for identifying an association between the terminal and the terminal.
- the additional FCS field may be a value obtained by calculating a CRC value of a field located after the existing FCS field.
- 13 to 20 illustrate that an access point simultaneously transmits data to a plurality of stations through a frame indicating that the plurality of terminal data is ready for transmission according to another embodiment of the present invention.
- the transmitting terminal may transmit the above-described A-RTS frame to the primary channel, and transmit the conventional RTS frame to the remaining available channel.
- the detailed operation may be as follows.
- the transmitting terminal may collect data to be transmitted for a predetermined time. Such a certain time may be referred to as a data accumulation timer. In this case, the transmitting terminal may wait without transmitting data even if the channel is in an idle state during the data accumulation timer. After collecting the data to be transmitted, the transmitting terminal secures a channel to transmit according to a contention method. In more detail, when the channel is idle for a predetermined time, the transmitting terminal may transmit an A-RTS frame to the primary channel after waiting for a contention window value and transmit the RTS frame to the remaining available subchannels.
- the determination of the available channel may determine whether the channel is idle for a predetermined time.
- the predetermined time may be PIFS.
- the RTS frame serves to prevent the reception of other terminals.
- the receiving terminal may obtain information on the plurality of terminal data to be transmitted through the A-RTS frame transmitted through the primary channel.
- the receiving terminal may transmit the CTS frame.
- receiving terminals may transmit a CTS frame through an assigned channel.
- the receiving terminal may determine the channel allocated to the receiving terminal based on the A-RTS.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the terminal identifier sorting order of the terminal identifier field of the A-RTS.
- the receiving terminal may determine a channel allocated to itself based on the RTS frame transmitted through the subchannel. In more detail, when the RTS frame indicating that there is data to be received through the subchannel together with the A-RTS frame of the primary channel is transmitted, the receiving terminal may determine that the channel on which the RTS frame is transmitted is allocated to the receiving terminal. . In addition, when the RTS frame indicating that there is data to be received other than the A-RTS frame is not received, the receiving terminal may determine that the primary channel is allocated to the receiving terminal. In addition, the receiving terminal may check whether the channel is available before transmitting the CTS frame. In more detail, the receiving terminal may determine that the channel is available when the channel is idle for a predetermined time.
- the predetermined time may be SIFS.
- the predetermined time may be the sum of SIFS and PIFS.
- the transmitting terminal may transmit the plurality of terminal data to the terminal that has transmitted the CTS frame.
- the receiving terminal transmits an ACK frame through a channel allocated to the receiving terminal.
- the receiving terminal may determine the channel allocated to the receiving terminal based on the A-RTS frame.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the plurality of terminal data.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the header of the plurality of terminal data.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the terminal identifier field of the multiple terminal data header. In this case, the receiving terminal may determine the allocated channel based on the arrangement order of the terminal identifiers included in the terminal identifier field of the multiple terminal data header. For example, when the header of the plurality of terminal data includes the identifier of the terminal in the order of the identifier of the first station, the identifier of the second station, the receiving terminal assigns the first channel among the available channels to the first station, It can be determined that the station has allocated the next channel. Also, the receiving terminal may determine a channel allocated to the receiving terminal based on the sorting order of the plurality of data included in the plurality of terminal data.
- the receiving terminal may decode the plurality of terminal data and determine a channel allocated to the receiving terminal by checking the sorting order of the plurality of data included in the plurality of terminal data. For example, when the plurality of terminal A-MPDUs include the MPDUs in the order of the MPDU for the first station and the MPDU for the second station, the receiving terminal assigns the first channel among the available channels to the first station, and the second terminal. It can be determined that the station has allocated the next channel.
- FIG. 13 shows that an access point transmits a plurality of terminal A-MPDUs to a plurality of stations when the number of available channels and the number of stations receiving the plurality of terminal A-MPDUs are the same.
- the transmitting terminal is an access point.
- the first station, second station, third station, fourth station, and fifth station receive the multiple terminal A-MPDUs from the access point.
- the access point transmits the A-RTS frame through the primary channel.
- the access point also transmits an RTS frame on the available subchannel.
- the first station, the second station, the third station, the fourth station, and the fifth station transmit the CTS frame through the assigned channel as described above.
- the first station, the second station, the third station, the fourth station, and the fifth station may determine the channel allocated to the base station based on the A-RTS frame.
- the first station, the second station, the third station, the fourth station, and the fifth station may determine the allocated channel based on the arrangement order of the terminal identifier field included in the A-RTS frame.
- the first station is a primary CH
- the second station is a first subchannel (Secondary CH # 1)
- the third station is a second subchannel (Secondary CH # 2)
- the fourth station is a third subchannel.
- Channel (Secondary CH # 3)
- the fifth station transmits the CTS frame on the fourth sub-channel (Secondary CH # 4).
- the access point includes a primary channel, a first subchannel (Secondary CH # 1), a second subchannel (Secondary CH # 2), a third subchannel (Secondary CH # 3), and a fourth subchannel (Secondary).
- a plurality of terminal A-MPDU is transmitted through CH # 4).
- the first station, second station, third station, fourth station, and fifth station transmit an ACK frame on the assigned channel.
- the first station is a primary channel
- the second station is a first subchannel (Secondary CH # 1)
- the third station is a second subchannel (Secondary CH # 2)
- the fourth station is a third subchannel ( Secondary CH # 3 and the fifth station transmit an ACK frame on the fourth subchannel (Secondary CH # 4).
- FIG. 14 illustrates an operation in which an access point transmits a plurality of terminal A-MPDUs to a plurality of stations when the number of stations receiving the plurality of terminal A-MPDUs is larger than the number of available channels. .
- the transmitting terminal may divide the plurality of terminal data and transmit the plurality of times. This is because the transmitting terminal lacks a channel capable of receiving the CTS frame and the ACK frame from the receiving terminal.
- the transmitting terminal may first transmit the plurality of terminal data to a plurality of terminals corresponding to the same number of available channels. Subsequently, when the plurality of terminals that receive the plurality of terminal data transmit the ACK frame, the remaining terminals that do not receive the plurality of terminal data may transmit the CTS frame after a predetermined time. In this case, the predetermined time may be SIFS.
- the transmitting terminal may transmit a plurality of terminal data to the receiving terminal that transmitted the CTS frame.
- the transmitting terminal may allocate a channel available to the receiving terminal in a round robin manner.
- the transmitting terminal can be assigned to the receiving terminal from the primary channel of the available primary channel and sub-channel.
- the transmitting terminal can allocate to the receiving terminal since the index of the subchannel among the available subchannels is small.
- the access point transmits a plurality of terminal A-MPDUs to a first station, a second station, a third station, a fourth station, a fifth station, a sixth station, and a seventh station.
- the access point allocates a channel in a round robin manner.
- the access point may assign a primary channel to a first station, a first subchannel (Secondary CH # 1) to a second station, a second subchannel (Secondary CH # 2) to a third station, and a fourth station.
- the first station, the second station, the third station, the fourth station, and the fifth station receive the plurality of terminal A-MPDUs through the above-described process, and transmit an ACK frame through the assigned channel.
- the sixth and seventh stations transmit the CTS frame on the assigned channel.
- the predetermined time may be SIFS.
- the access point receiving the CTS frame from the sixth station and the seventh station transmits a plurality of terminal A-MPDUs to the sixth station and the seventh station.
- an access point transmits a plurality of terminal A-MPDUs to a plurality of stations when there is a channel unavailable.
- the transmitting terminal does not allocate a channel that is not used by another terminal to the receiving terminal.
- the transmitting terminal does not transmit the RTS frame and the A-RTS frame through a channel that another terminal uses.
- the receiving terminal may determine whether all channels are available before sending the CTS frame. In this case, if a channel not allocated by the transmitting terminal is available, the receiving terminal may transmit the CTS frame through the corresponding channel. In addition, the receiving terminal may determine the channel allocated by the transmitting terminal based on the available channel before sending the CTS frame.
- the available channel when the transmitting terminal sends the A-RTS frame is the primary channel and the second subchannel
- the available channel before the receiving terminal sends the CTS frame is the main channel, the first subchannel, and the second subchannel.
- the receiving terminal may determine the order of channels allocated by the transmitting terminal to the receiving terminal as the primary channel, the first subchannel, and the second subchannel.
- the receiving terminal may determine whether it is available based on whether the channel is idle for a predetermined time.
- the predetermined time may be SIFS.
- the predetermined time may be a sum of SIFS and PIFS.
- the access point allocates the remaining channels to the station except for the third subchannel (Secondary CH # 3) currently used by another terminal.
- the access point may include a primary channel to the first station, a primary subchannel (Secondary CH # 1) to the second station, a secondary subchannel (Secondary CH # 2) to the third station, and a fourth station to the fourth station.
- Second channel (Secondary CH # 4), Primary channel (Primary CH) to the fifth station, Second subchannel (Secondary CH # 1) to the sixth station, Second subchannel (Secondary CH # 2) to the seventh station Assign.
- the first station, the second station, the third station, and the fourth station receive the plurality of terminal A-MPDUs through the above-described process, and transmit an ACK frame through the assigned channel.
- the fifth station, the sixth station, and the seventh station transmit the CTS frame on the assigned channel.
- the predetermined time may be SIFS.
- the access point receiving the CTS frame from the fifth station, the sixth station, and the seventh station transmits a plurality of terminal A-MPDUs to the fifth station, the sixth station, and the seventh station.
- the terminal when the number of receiving terminals is larger than the number of available channels, the terminal receives the CTS frames from the receiving terminals corresponding to the number of available channels, and first transmits the plurality of terminal data to the receiving terminal. Send it. Thereafter, the CTS frame is received from the remaining receiving terminals, and the plurality of terminal data should be transmitted to the receiving terminal which transmitted the CTS frame. Therefore, a plurality of terminal data must be divided and transmitted.
- the CTS frame may be received from all receiving terminals before transmitting the plurality of terminal data, thereby transmitting the plurality of terminal data at once.
- one designated channel may be a main channel.
- the transmitting terminal may transmit an A-RTS frame on one designated channel.
- the plurality of receiving terminals may transmit the CTS frame through one designated channel.
- the plurality of receiving terminals may sequentially transmit CTS frames.
- the receiving terminal may transmit the CTS frame based on a transmission order between a plurality of predetermined receiving terminals.
- the receiving terminal may determine the order of transmitting the CTS frame based on the A-RTS frame.
- the receiving terminal may transmit the CTS frame based on the terminal identifier sorting order of the terminal identifier field included in the A-RTS frame.
- the receiving terminal may determine the terminal identifier sorting order of the terminal identifier field included in the A-RTS frame as the CTS frame transmission order of the terminal identified by the terminal identifier. For example, when the terminal identifier field of the A-RTS frame includes the identifier of the first station, the identifier of the second station, and the identifier of the third station, the first station first transmits the CTS frame and then the second station. After transmitting this CTS frame, the third station may transmit the CTS frame. When the CTS frame in the latest order is transmitted, the transmitting terminal may transmit the RTS frame to the remaining available channel instead of one channel in which the transmitting terminal is designated to transmit the control frame.
- the determination of the available channel may determine whether the channel is idle for a predetermined time.
- the predetermined time may be SIFS.
- the predetermined time may be a sum of SIFS and PIFS.
- the transmitting terminal can transmit a plurality of terminal data by stably securing the available channel through the transmission of the RTS.
- the transmitting terminal may transmit the plurality of terminal data after receiving the last CTS.
- the receiving terminal may receive the A-MPDU and transmit an ACK frame through one designated channel. In this case, the receiving terminal may transmit the ACK frame based on a predetermined transmission order between the plurality of receiving terminals, such as transmitting the CTS frame.
- the receiving terminal may determine the order of transmitting the ACK frame based on the A-RTS frame. In more detail, the receiving terminal may transmit the ACK frame based on the arrangement order of the terminal identifiers included in the terminal identifier field included in the A-RTS frame. According to a specific embodiment, the receiving terminal may determine the arrangement order of the terminal identifiers included in the terminal identifier field included in the A-RTS frame as the order of transmitting the ACK frames of the terminal identified by the terminal identifier. In this case, the value of the duration field of each ACK frame may be the sum of the transmission time of the ACK frames to be transmitted after the transmission of the corresponding ACK frame and the waiting time. At this time, the waiting time may be SIFS.
- the transmitting terminal transmits data to the receiving terminal that has not transmitted the ACK frame after a time point for receiving the last ACK frame has elapsed.
- the data transmitted to the receiving terminal may include only data for the corresponding terminal.
- the data transmitted to the receiving terminal may be a plurality of terminal A-MPDUs.
- the transmitting terminal is an access point.
- the access point transmits the multiple terminal A-MPDUs to the first station, the second station, the third station, the fourth station, and the fifth station.
- the access point transmits the A-RTS frame on the primary channel.
- the first station, the second station, the third station, the fourth station, and the fifth station transmit the CTS frame to the access point through the primary channel.
- the first station, the second station, the third station, the fourth station, and the fifth station sequentially transmit the CTS frame through the primary channel.
- the receiving terminal may determine the order of transmitting the CTS frame based on the A-RTS.
- the access point When the fifth station transmits a CTS frame, the access point transmits the RTS frame on all available channels other than the channel through which the fifth station transmits the CTS frame. Thereafter, the access point transmits the plurality of terminal A-MPDUs.
- the first station, the second station, the third station, the fourth station, and the fifth station sequentially transmit ACK frames on the primary channel.
- the value of the duration field of each ACK frame may be the sum of the transmission time of the ACK frames to be transmitted after the transmission of the corresponding ACK frame and the SIFS waiting time.
- the access point according to an embodiment of the present invention provides a plurality of stations. Shows transmitting a plurality of terminal A-MPDU.
- the plurality of receiving terminals may transmit the CTS frame through only one designated channel. That is, the plurality of receiving terminals that receive the plurality of terminal data from the same transmitting terminal may transmit the CTS frame through one designated channel. In this case, the order of transmitting the CTS frame may be as described with reference to the embodiment of FIG. 16.
- a plurality of receiving terminals may simultaneously transmit ACK frames through a channel assigned to each terminal.
- the receiving terminal may determine a channel allocated to itself based on the A-RTS frame. In another specific embodiment, as described in the embodiments of FIGS. 12 to 15, the receiving terminal may determine a channel allocated to itself based on the plurality of terminal data.
- the access point transmits a plurality of terminal A-MPDUs to a first station, a second station, a third station, a fourth station, and a fifth station.
- the access point transmits the A-RTS frame on the primary channel.
- the first station, second station, third station, fourth station, and fifth station sequentially transmit CTS frames.
- the first station, the second station, the third station, the fourth station, and the fifth station may determine the transmission order based on the A-RTS frame as described above.
- the receiving terminal may determine the order of transmitting the CTS frame based on the A-RTS.
- the access point When the fifth station transmits a CTS frame, the access point transmits the RTS frame on all available channels other than the channel through which the fifth station transmits the CTS frame. Thereafter, the access point transmits the plurality of terminal A-MPDUs.
- the first station, the second station, the third station, the fourth station, and the fifth station each simultaneously transmit ACK frames on a designated channel. Through this operation, it is possible to shorten the time for the transmitting terminal to receive the ACK frame from the receiving terminal.
- an access point transmits a plurality of terminal A-MPDUs.
- the transmitting terminal may transmit the RTS frame through all available channels other than the channel for transmitting the CTS frame.
- the transmitting terminal may determine whether all channels are available. In more detail, when the channel is idle for a certain time, it may be determined as an available channel.
- the predetermined time may be PIFS. In another specific embodiment, the predetermined time may be a sum of SIFS and PIFS. Therefore, the transmitting terminal transmits the RTS frame except for the channel being used by another user. In addition, the transmitting terminal may transmit the plurality of terminal data through the available channel except for the unavailable channel being used by another user.
- a plurality of receiving terminals may simultaneously transmit ACK frames through designated channels.
- the receiving terminal may determine the designated channel and the transmission order based on the A-RTS frame.
- the receiving terminal may determine the designated channel and the transmission order based on the terminal identifier order of the terminal identifier field of the A-RTS frame.
- the receiving terminal may determine that the designated channel is assigned to the receiving terminal identified by the terminal identifier in a round robin manner and the transmission order according to the terminal identifier order of the terminal identifier field of the A-RTS frame.
- the available channel is the primary channel and the first subchannel and the terminal identifier field of the A-RTS frame includes the identifier of the first station, the identifier of the second station, and the identifier of the third station in order.
- the ACK frame can be transmitted through the second station first subchannel.
- the third station may transmit an ACK frame on the primary channel.
- the receiving terminal may determine the designated channel and the transmission order based on the plurality of terminal data. Specifically, when the number of available channels is smaller than the number of receiving terminals, the receiving terminal may determine the designated channel and the transmission order based on the order of the terminal identifiers included in the terminal identifier field of the header of the multi-terminal data frame. According to a specific embodiment of the present invention, the receiving terminal transmits the designated channel and the transmission channel as assigned to the receiving terminal identified by the terminal identifier in a round robin manner according to the order of the terminal identifier included in the terminal identifier field of the header of the multiple terminal data. You can determine the order.
- the available channel is the primary channel and the first subchannel
- the terminal identifier field of the header of the plurality of terminal data includes the identifier of the first station, the identifier of the second station, and the identifier of the third station in order
- the station may transmit an ACK frame on the primary channel and on the second station first subchannel.
- the third station may transmit an ACK frame on the primary channel.
- the receiving terminal may determine the designated channel and the transmission order based on the sorting order of the plurality of data included in the plurality of terminal data frames.
- the receiving terminal determines that the designated channel and the transmission order are assigned to the receiving terminal identified by the terminal identifier in a round robin manner according to the sorting order of the plurality of data included in the plurality of terminal data.
- the ACK frame can be transmitted through the second station first subchannel.
- the access point transmits a plurality of terminal A-MPDUs to a first station, a second station, a third station, a fourth station, and a fifth station.
- the access point transmits the A-RTS frame on the primary channel.
- the first station, second station, third station, fourth station, and fifth station sequentially transmit CTS frames.
- the first station, the second station, the third station, the fourth station, and the fifth station may determine the transmission order based on the A-RTS frame as described above.
- the access point transmits the RTS frame on all available channels other than the channel through which the fifth station transmits the CTS frame.
- FIG. 1 the embodiment of FIG.
- the access point transmits the plurality of terminal A-MPDUs.
- the transmitting terminal transmits the multiple terminal A-MPDUs through the remaining channels except for the third subchannel (Secondary CH # 3).
- the first station, the second station, the third station, and the fourth station each transmit an ACK frame simultaneously through a designated channel.
- the fifth station transmits the ACK frame on the primary channel after a predetermined time from when the first station transmits the ACK frame. In this case, the predetermined time may be SIFS. Through this operation, it is possible to shorten the time for the transmitting terminal to receive the ACK frame from the receiving terminal.
- FIG. 19 shows that an access point according to another embodiment of the present invention transmits data to a terminal that does not support the embodiment of the present invention and a terminal that supports the embodiment of the present invention.
- the transmitting terminal may transmit the plurality of terminal data through the main channel and the remaining available channels rather than the subchannels extending the main channel.
- the transmitting terminal may transmit the A-RTS frame through the first subchannel among the remaining available channels rather than the main channel and the subchannels extending the main channel.
- the transmitting terminal transmits only the A-RTS frame and may immediately transmit the plurality of terminal data without responding to the CTS frame.
- the transmitting terminal may transmit the plurality of terminal data through a primary channel and an available channel other than the primary channel.
- the predetermined time may be SIFS.
- the transmitting terminal may determine that the channel is available when the channel is idle during PIFS. In this case, a collision with another data transmission may occur due to a hidden node. However, there is an advantage to reduce the time consumption that occurs during the transmission of the CTS frame.
- Each of the plurality of receiving terminals may transmit an ACK frame through a channel allocated to each receiving terminal as in the above-described embodiment.
- the access point is a third station and a fifth station that do not support the embodiment of the present invention, and a first station, the second station, the fourth station, the sixth station, which supports the embodiment of the present invention. And transmit data to the seventh station.
- the access point transmits data to the third station and the fifth station through a primary channel.
- the access point transmits an A-RTS frame through a primary channel (Secondary CH # 1), which is an available channel rather than a primary channel and a subchannel extending the primary channel.
- the access point transmits a plurality of terminal A-MPDUs when SIFS elapses from when the A-RTS frame is transmitted.
- the access point is the first subchannel (Secondary CH # 1) except the fourth subchannel (Secondary CH # 4) and the second subchannel (Secondary). CH # 2), the third subchannel (Secondary CH # 3), the fifth subchannel (Secondary CH # 5), the sixth subchannel (Secondary CH # 6), and the seventh subchannel (Secondary CH # 7).
- A-MPDU is transmitted through multiple terminals.
- the first station, second station, fourth station, sixth station, and seventh station transmit an ACK frame to the access point according to the assigned channel.
- FIG. 20 shows that an access point according to another embodiment of the present invention transmits data to a terminal that does not support the embodiment of the present invention and a terminal that supports the embodiment of the present invention.
- the transmitting terminal may transmit the plurality of terminal data through the remaining available channel rather than the main channel and the subchannels extending the main channel.
- the transmitting terminal may transmit the A-RTS frame through the first subchannel among the remaining available channels rather than the main channel and the subchannels extending the main channel.
- the transmitting terminal may transmit the RTS frame to all available channels other than the primary channel and the subchannels extending the primary channel.
- the transmitting terminal may transmit an RTS frame on an available channel other than a subchannel extending the main channel and the main channel while transmitting the A-TRS frame.
- the transmitting terminal may transmit the plurality of terminal data through not only a channel receiving the CTS frame but also a channel available when transmitting the plurality of terminal data.
- the transmitting terminal may transmit the plurality of terminal data through not only a channel that receives the CTS frame but also a channel that is idle for a predetermined time when the plurality of terminal data is transmitted.
- the predetermined time may be PIFS.
- the transmitting terminal may sense the state of the channel that has not received the CTS frame.
- the access point is a third station and a fifth station that do not support the embodiment of the present invention, and a first station, the second station, the fourth station, the sixth station, which supports the embodiment of the present invention. And transmit data to the seventh station.
- the access point transmits data to the third station and the fifth station through a primary channel.
- the access point transmits an A-RTS frame through a primary channel (Secondary CH # 1), which is an available channel rather than a primary channel and a subchannel extending the primary channel.
- SIFS is elapsed from when the A-RTS frame was transmitted, the access point transmits the RTS frame to the first station, second station, fourth station, sixth station, and seventh station.
- the access point transmits an RTS frame for each station through a channel assigned to each station.
- the CTS frame is transmitted to the first station, the second station, the fourth station, the sixth station, and the seventh station.
- the access point determines whether the channel over which the CTS frame is transmitted and the remaining channels other than the primary channel are available. It is determined that the fourth subchannel (Secondary CH # 4) and the seventh subchannel (Secondary CH # 7) are available, so that the access point includes a first subchannel (Secondary CH # 1) and a second subchannel (Secondary CH #).
- a plurality of terminal A-MPDUs are transmitted to a first station, a second station, a fourth station, a sixth station, and a seventh station through a secondary channel # 7.
- the first station, second station, fourth station, sixth station, and seventh station transmit an ACK frame to the access point according to the assigned channel.
- the above-described embodiments secure a channel through an RTS frame or an A-RTS frame and transmit a plurality of terminal data.
- data collision may be prevented by stably securing a channel for transmitting the multiple terminal A-MPDUs.
- it takes a long time to transmit the RTS frame or the A-RTS frame which may delay the transmission of data. Therefore, when the transmitting terminal transmits the multi-terminal data without securing the channel through the RTS frame or the A-RTS, a collision risk with other data transmission is high, but the transmission time of the multi-terminal data can be advanced. This will be described with reference to FIGS. 21 through 23.
- 21 to 23 illustrate that an access point transmits data to a plurality of stations without a frame transmission indicating that the plurality of terminal data is prepared for transmission according to another embodiment of the present invention.
- 21 shows an access point transmitting a plurality of terminal A-MPDUs to a plurality of stations according to another embodiment of the present invention without transmitting a frame indicating preparation for data transmission.
- the transmitting terminal waits for a predetermined time. If the corresponding channel is idle for a certain time, the transmitting terminal performs a contention procedure that randomly backs off within the contention window value.
- the predetermined time may be DIFS. In another specific embodiment, the predetermined time may be an arbitration inter-frame space (AIFS).
- the channel may be a main channel.
- the transmitting terminal may transmit the plurality of terminal data through the available channel without transmitting a frame indicating that the data is ready for data transmission.
- the transmitting terminal may transmit the plurality of terminal data through the available channel without transmitting the RTS frame or the A-RTS frame.
- the transmitting terminal may determine whether the corresponding channel is idle for a predetermined time.
- the predetermined time may be PIFS.
- the plurality of receiving terminals may transmit an ACK frame through one designated channel.
- the receiving terminal may transmit the ACK frame based on a predetermined transmission order between the plurality of receiving terminals.
- the receiving terminal may determine the transmission order of the ACK frame based on the header of the plurality of terminal data.
- the receiving terminal may determine its own transmission order based on the terminal identifier field of the multiple terminal data header.
- the receiving terminal may determine the sorting order of the terminal identifiers included in the terminal identifier field of the multiple terminal data header as an order of transmitting the ACK frame of the receiving terminal identified by the terminal identifier among the plurality of receiving terminals.
- the receiving terminal when the header of the plurality of terminal data includes the identifier of the terminal in the order of the identifier of the first station, the identifier of the second station, the receiving terminal transmits the ACK frame by the first station, and the second station transmits the ACK frame. You can judge that.
- the receiving terminal may determine the transmission order of the ACK frame based on the sorting order of the plurality of data included in the plurality of terminal data. Specifically, the receiving terminal decodes the plurality of terminal data to check the sorting order of the plurality of data included in the plurality of terminal data, and the order in which the receiving terminal related to the data among the plurality of terminals transmits the ACK frame.
- one designated channel may be a main channel.
- one designated channel may be any subchannel other than a subchannel extending a main channel among a plurality of subchannels.
- a value of the duration field of each ACK frame transmitted by the receiving terminal indicates a transmission time of the ACK frames to be transmitted after the transmission of the corresponding ACK frame and a waiting time accordingly. It can be the sum of all. At this time, the waiting time may be SIFS.
- the value of the duration field of each ACK frame may be the sum of the transmission time of the ACK frames to be transmitted after the transmission of the corresponding ACK frame and the waiting time.
- the waiting time may be SIFS.
- the access point transmits a plurality of terminal A-MPDUs to a first station, a second station, a third station, a fourth station, and a fifth station.
- the access point performs a competition procedure.
- the access point transmits the multiple terminal A-MPDUs over the available channel, without transmitting a frame indicating that data is ready for data transmission after the contention procedure.
- the access point may transmit a primary CH, a secondary subchannel (Secondary CH1), a secondary subchannel (Secondary CH2), and a secondary subchannel (Secondary) without transmitting a frame indicating that data is ready for data transmission after a contention procedure.
- the receiving terminal transmits the ACK frame through the primary channel in the designated order. Specifically, the ACK frame is transmitted through the primary channel in order to the first station, the second station, the third station, the fourth station, and the fifth station.
- 22 and 23 illustrate that an access point transmits a plurality of terminal A-MPDUs to a plurality of stations without a frame transmission indicating that data transmission is prepared, and a plurality of stations are assigned to each of the plurality of stations. Shows simultaneous transmission of ACK frames on a channel.
- each of the plurality of terminals may transmit an ACK frame through a channel allocated to each receiving terminal.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the plurality of terminal data.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the header of the plurality of terminal data. For example, the receiving terminal may determine a channel allocated to the receiving terminal based on the terminal identifier field of the multiple terminal data header.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the arrangement order of the terminal identifiers included in the terminal identifier field of the multiple terminal data header. According to a specific embodiment, the receiving terminal may determine the sorting order of the terminal identifiers included in the terminal identifier field of the multiple terminal data header as the sorting order of the channels allocated to the receiving terminal identified by the terminal identifier. For example, when the header of the plurality of terminal data includes the identifier of the terminal in the order of the identifier of the first station, the identifier of the second station, the receiving terminal assigns the first channel among the available channels to the first station, It can be determined that the station has allocated the next channel.
- the receiving terminal may determine a channel allocated to the receiving terminal based on the sorting order of the plurality of data included in the plurality of terminal data. In more detail, the receiving terminal may determine a channel allocated to the receiving terminal by decoding the plurality of terminal data and confirming an arrangement order of the plurality of data included in the plurality of terminal data. For example, when the plurality of terminal A-MPDUs include the MPDUs in the order of the MPDU for the first station and the MPDU for the second station, the receiving terminal assigns the first channel among the available channels to the first station, and the second terminal. It can be determined that the station has allocated the next channel.
- the receiving terminal may determine the designated channel and the transmission order based on the plurality of terminal data. Specifically, when the number of available channels is smaller than the number of receiving terminals, the receiving terminal may determine the designated channel and the transmission order based on the order of the terminal identifiers included in the terminal identifier field of the header of the multi-terminal data frame. In a specific embodiment, the receiving terminal may determine that the designated channel and the transmission order are allocated to the receiving terminal in a round robin manner according to the order of the terminal identifier included in the terminal identifier field of the header of the multiple terminal data. have.
- the available channel is the primary channel and the first subchannel
- the terminal identifier field of the header of the plurality of terminal data includes the identifier of the first station, the identifier of the second station, and the identifier of the third station in order
- the station may transmit an ACK frame on the primary channel and on the second station first subchannel.
- the third station may transmit an ACK frame on the primary channel.
- the receiving terminal may determine the channel assigned to itself except the unavailable channel.
- the receiving terminal may determine the designated channel and the transmission order based on the sorting order of the plurality of data included in the plurality of terminal data.
- the receiving terminal may determine that the designated channel and the transmission order are allocated to the receiving terminal in a round robin manner according to the sorting order of the plurality of data included in the plurality of terminal data. For example, if the available channel is the primary channel and the first subchannel and the multiple terminal A-MPDUs include the MPDU for the first station, the MPDU for the second station, and the MPDU for the third station, in order, the first station. Through this primary channel, the ACK frame can be transmitted through the second station first subchannel.
- a value of the duration field of each ACK frame transmitted by the receiving terminal indicates a transmission time of the ACK frames to be transmitted after the transmission of the corresponding ACK frame and a waiting time accordingly. It can be the sum of all. At this time, the waiting time may be SIFS.
- the access point transmits a plurality of terminal A-MPDUs to a first station, a second station, a third station, a fourth station, and a fifth station.
- the access point performs a competition procedure.
- the access point transmits the multiple terminal A-MPDUs over the available channel, without transmitting a frame indicating that data is ready for data transmission after the contention procedure.
- the access point may transmit a primary CH, a secondary subchannel (Secondary CH1), a secondary subchannel (Secondary CH2), and a secondary subchannel (Secondary) without transmitting a frame indicating that data is ready for data transmission after a contention procedure.
- the receiving terminal transmits an ACK frame through the assigned channel.
- the first station is a primary CH
- the second station is a first subchannel (Secondary CH1)
- the third station is a second subchannel (Secondary CH2)
- the fourth station is a third subchannel (Secondary CH3).
- the fifth station transmits an ACK frame on the fourth subchannel (Secondary CH4).
- the access point may transmit a primary CH, a secondary subchannel (Secondary CH1), a secondary subchannel (Secondary CH2), and a secondary subchannel (Secondary) without transmitting a frame indicating that data is ready for data transmission after a contention procedure.
- a plurality of terminal A-MPDU is transmitted through CH4).
- the receiving terminal transmits the ACK frame through the channel assigned to the receiving terminal in the specified order. At this time, when the receiving terminal determines the channel assigned to the terminal, the receiving terminal determines the channel allocated to the terminal except for the channel which is not available because the channel is not available.
- the first station is a primary channel
- the second station is a first subchannel (Secondary CH1)
- the third station is a second subchannel (Secondary CH2)
- the fourth station is a fourth subchannel (Secondary CH4).
- the fifth station transmits an ACK frame on the primary channel.
- the value of the duration field of the ACK frame transmitted by the first station may be the sum of the ACK frame transmission time of the fifth station and the SIFS accordingly.
- FIG. 24 is a ladder diagram illustrating an operation of a terminal simultaneously transmitting data to a plurality of other terminals according to an embodiment of the present invention.
- the transmitting terminal 500 receives data for a plurality of receiving terminals (S301).
- the transmitting terminal 500 may generate a plurality of terminal A-MPDUs by collecting data about the plurality of receiving terminals.
- the plurality of terminal data may include a header of the plurality of terminal data for signaling data included in the plurality of terminal data.
- the plurality of terminal A-MPDUs may include a plurality of MPDUs.
- the first MPDU of the plurality of MPDUs may be a header for signaling data included in the plurality of terminal A-MPDUs.
- the header of the plurality of terminal data may include a group address for identifying a group representing the plurality of receiving terminals.
- the header of the plurality of terminal data may include information on the channel used by the wireless communication terminal and the MCS of the signal used in the channel.
- the header of the plurality of terminal data may include user information indicating a relationship between the plurality of data included in the plurality of terminal data and the plurality of receiving terminals.
- the user information may indicate a channel allocated to the plurality of receiving terminals.
- the plurality of receiving terminals may transmit control frames to the transmitting terminal through the assigned channel.
- the control frame may be a frame indicating completion of reception of data.
- the frame may be an ACK frame.
- the control frame may be a frame indicating that data can be received.
- the frame may be a CTS frame.
- the transmitting terminal 500 transmits the plurality of terminal data to the receiving terminal 400 based on the data of the plurality of receiving terminals (S303). In more detail, the transmitting terminal 500 may transmit a plurality of terminal A-MPDUs to the receiving terminal 400.
- the receiving terminal 400 receives the plurality of terminal data from the transmitting terminal 500. In more detail, the receiving terminal 400 may receive a plurality of terminal A-MPDUs from the transmitting terminal 500.
- the transmitting terminal 500 may transmit a frame indicating that data is ready for transmission before transmitting the plurality of terminal data. In this case, the frame indicating preparation for transmission may be an A-RTS frame indicating preparation for transmission of a plurality of terminal data.
- the A-RTS frame may include a plurality of terminal identifiers respectively identifying a plurality of receiving terminals and the number of the plurality of receiving terminals.
- the frame indicating that the transmission is ready may be an RTS frame indicating that the data transmission is prepared for any one terminal.
- the receiving terminal 400 may transmit a frame indicating that the data can be received to the transmitting terminal 500.
- the frame may be a CTS frame.
- the receiving terminal 400 may transmit a control frame related to transmission control of the MAC frame through a channel allocated to the receiving terminal.
- the receiving terminal 400 may determine a channel allocated to the receiving terminal 400 based on the A-RTS frame.
- the receiving terminal 400 may determine a channel allocated to the receiving terminal 400 based on the arrangement order of the terminal identifiers included in the A-RTS frame. In addition, the receiving terminal 400 may determine a channel allocated to the receiving terminal 400 based on the plurality of terminal data. In more detail, a channel allocated to the receiving terminal 400 may be determined based on an arrangement order of terminal identifiers included in the plurality of terminal data. In addition, the receiving terminal 400 may determine a channel allocated to the receiving terminal 400 based on the sorting order of the plurality of data included in the plurality of terminal data. In addition, the plurality of receiving terminals including the receiving terminal 400 may transmit a control frame related to the transmission control of the MAC frame through any one of the designated transmission channels as described above.
- the receiving terminal 400 may transmit the control frame based on the transmission order between the plurality of receiving terminals transmitting the control frame.
- the receiving terminal 400 may determine the transmission order based on the A-RTS frame.
- the receiving terminal 400 may determine the transmission order based on the arrangement order of the terminal identifiers included in the A-RTS frame.
- the receiving terminal 400 may determine the transmission order based on the plurality of terminal data.
- the transmission order may be determined based on the arrangement order of the terminal identifiers included in the plurality of terminal data.
- the receiving terminal 400 may determine the transmission order based on the sorting order of the plurality of data included in the plurality of terminal data.
- the control frame may include a frame indicating that reception is possible.
- the control frame may include a frame indicating that the reception is completed.
- the receiving terminal 400 obtains data related to itself from the plurality of terminal data (S305).
- the receiving terminal 400 may obtain an MPDU associated with itself from the plurality of terminal A-MPDUs.
- the receiving terminal 400 may obtain an MPDU associated with itself based on user information indicating a relationship between the plurality of data included in the plurality of terminal data included in the header of the plurality of terminal data and the plurality of receiving terminals.
- the receiving terminal 400 may determine the location of the MPDU including the data related to the receiving terminal 400 based on the arrangement order of the terminal identifiers of the header of the plurality of terminal data.
- the receiving terminal 400 may obtain an MPDU associated with it based on the terminal identifier field of the A-RTS frame.
- the receiving terminal 400 may determine the location of the MPDU including data related to the receiving terminal 400 based on the arrangement order of the terminal identifier fields of the A-RTS frame.
- the reception terminal 400 transmits a frame indicating completion of reception of the plurality of terminal data (S307).
- the receiving terminal 400 may transmit a frame indicating reception completion through a channel allocated to the receiving terminal.
- the method of determining the channel allocated to the receiving terminal may be the same as that of transmitting the control frame in step S303 of transmitting the plurality of terminal data to the receiving terminal 400.
- the plurality of receiving terminals including the receiving terminal 400 may transmit a frame indicating completion of reception through any one of the designated transmission channels as described above.
- the reception terminal 400 may transmit a frame indicating reception completion based on a transmission order between a plurality of reception terminals that transmit a frame indicating reception completion.
- the method of determining the transmission order may be the same as that of the transmission of the control frame in step S303 of transmitting the plurality of terminal data to the receiving terminal 400.
- the frame indicating completion of reception may be an ACK frame.
- 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 a computer system having a general hardware architecture.
Abstract
Description
Claims (20)
- 무선 통신 단말에서,무선 신호를 송수신하는 송수신부; 및상기 단말의 동작을 제어하는 프로세서를 포함하고,상기 프로세서는복수의 단말에 전송할 데이터를 모아,상기 복수의 단말로 동시에 데이터를 전송하기 위한 집합 맥 프로토콜 데이터 유닛을 생성하고,상기 복수의 단말에게 상기 집합 맥 프로토콜 데이터 유닛을 전송하는무선 통신 단말.
- 제1항에서,상기 송수신부는상기 집합 맥 프로토콜 데이터 유닛의 전송을 준비함을 나타내는 제1 프레임을 전송하는무선 통신 단말.
- 제2항에서,상기 제1 프레임은상기 복수의 단말을 각각 식별하는 복수의 단말 식별자와 상기 복수의 단말의 개수를 포함하는무선 통신 단말.
- 제3항에서,상기 복수의 단말 식별자의 정렬 순서는 상기 복수의 단말에 할당된 채널의 정렬 순서를 나타내는무선 통신 단말.
- 제2항에서,상기 송수신부는상기 제1 프레임을 주채널과 주채널을 확장하는 부채널이 아닌 가용 채널을 통해 전송하는무선 통신 단말.
- 제2항에서,상기 송수신부는상기 제1 프레임을 복수의 가용 채널 중 어느 하나의 채널을 통해 전송하고, 상기 복수의 가용 채널에서 상기 어느 하나의 채널을 제외한 나머지 가용 채널을 통해 어느 하나의 단말에 대해 데이터 전송을 준비함을 나타내는 제2 프레임을 전송하는무선 통신 단말.
- 제1항에서,상기 송수신부는상기 집합 맥 프로토콜 데이터 유닛을 주채널과 주채널을 확장하는 부채널을 아닌 가용 채널을 통해 전송하는무선 통신 단말.
- 제1항에서,상기 집합 맥 프로토콜 데이터 유닛은복수의 맥 프로토콜 데이터 유닛을 포함하고, 상기 복수의 맥 프로토콜 데이터 유닛의 가장 첫 번째 맥 프로토콜 데이터 유닛은 상기 집합 맥 프로토콜 데이터 유닛이 포함하는 데이터를 시그널링하는 헤더인무선 통신 단말.
- 제8항에서,상기 헤더는상기 복수의 단말을 나타내는 그룹을 식별하는 그룹 주소를 포함하는무선 통신 단말.
- 제8항에서,상기 헤더는상기 무선 통신 단말이 사용하는 채널과 상기 채널에서 사용되는 신호의 모듈레이션 및 코딩 스킴(Modulation and Coding Scheme, MCS)에 관한 정보를 포함하는무선 통신 단말.
- 제8항에서,상기 헤더는상기 집합 맥 프로토콜 데이터 유닛이 포함하는 상기 복수의 맥프로토콜 데이터 유닛과 상기 복수의 단말간의 관계를 나타내는 사용자 정보를 포함하는무선 통신 단말.
- 무선 통신 단말에서무선 신호를 송수신하는 송수신부; 및상기 단말의 동작을 제어하는 프로세서를 포함하고,상기 송수신부는복수의 단말로 동시에 데이터를 전송하기 위한 집합 맥 프로토콜 데이터 유닛을 수신하고,상기 프로세서는상기 집합 맥 프로토콜 데이터 유닛으로부터 상기 무선 통신 단말과 관련된 맥 프로토콜 데이터 유닛을 획득하는무선 통신 단말.
- 제12항에서,상기 송수신부는상기 집합 맥 프로토콜 데이터 유닛의 전송을 준비함을 나타내는 제1 프레임을 수신하는무선 통신 단말.
- 제13항에서,상기 제1 프레임은상기 복수의 단말을 각각 식별하는 복수의 단말 식별자와 상기 복수의 단말의 개수를 포함하는무선 통신 단말.
- 제14항에서,상기 복수의 단말 식별자의 정렬 순서는 상기 복수의 단말에 할당된 채널의 정렬 순서를 나타내고,상기 프로세서는상기 복수의 단말 식별자의 정렬 순서에 기초하여 상기 무선 통신 단말에 할당된 채널을 판단하고,상기 송수신부는상기 무선 통신 단말에 할당된 채널을 통해 상기 집합 맥 프로토콜 데이터 유닛을 전송하는 무선 통신 단말에게 제어 프레임을 전송하는무선 통신 단말.
- 제14항에서,상기 복수의 단말 식별자의 정렬 순서는 상기 집합 맥 프로토콜 데이터 유닛을 전송하는 무선 통신 단말에게 제어 프레임을 전송하는 상기 복수의 단말 사이의 전송 순서를 나타내고,상기 프로세서는상기 복수의 단말 식별자의 정렬 순서에 기초하여 상기 복수의 단말 사이의 전송 순서를 판단하고,상기 송수신부는상기 무선 통신 단말에 할당된 채널을 통해 상기 집합 맥 프로토콜 데이터 유닛을 전송하는 무선 통신 단말에게 상기 제어 프레임을 전송하는무선 통신 단말.
- 제16항에서,상기 복수의 단말은상기 제어 프레임을 지정된 하나의 채널을 통해 전송하는무선 통신 단말.
- 제16항에서,상기 제어 프레임은데이터 전송이 가능함을 나타내는 프레임인무선 통신 단말.
- 제14항에서,상기 프로세서는상기 집합 맥 프로토콜 데이터 유닛에 기초하여 상기 무선 통신 단말이 사용하는 채널과 상기 채널에서 사용되는 신호의 모듈레이션 및 코딩 스킴(Modulation and Coding Scheme, MCS)에 관한 정보를 획득하는무선 통신 단말.
- 무선 통신 단말의 동작 방법에서,복수의 단말에 전송할 데이터를 모으는 단계;상기 복수의 단말로 동시에 데이터를 전송하기 위한 집합 맥 프로토콜 데이터 유닛을 생성하는 단계; 및상기 집합 맥 프로토콜 데이터 유닛을 전송하는 단계를 포함하는동작 방법.
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