WO2016028032A1 - 데이터 동시 통신을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말 - Google Patents
데이터 동시 통신을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말 Download PDFInfo
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- WO2016028032A1 WO2016028032A1 PCT/KR2015/008498 KR2015008498W WO2016028032A1 WO 2016028032 A1 WO2016028032 A1 WO 2016028032A1 KR 2015008498 W KR2015008498 W KR 2015008498W WO 2016028032 A1 WO2016028032 A1 WO 2016028032A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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- H—ELECTRICITY
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- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the present invention relates to a wireless communication method for simultaneous data communication and a wireless communication terminal using the same, and more particularly, to suppress the interference and guarantee the equity between the terminals when performing data simultaneous communication for spatial reuse of a communication system.
- 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
- an object of the present invention is to provide high-efficiency / high-performance wireless LAN communication in a high density environment.
- BSS Basic Service Set
- the present invention has an object of increasing the transmission opportunity and transmission rate of data by providing an efficient spatial reuse method in the overlapped BSS environment.
- the present invention has an object to solve the problem of inequality of the legacy terminal that may occur when the adjusted CCA threshold is used for channel access.
- the present invention has an object to minimize the interference problem between the terminals in the spatial reuse period.
- the present invention provides a wireless communication method and a wireless communication terminal as follows.
- the present invention provides a wireless communication method of a terminal, comprising: receiving a radio signal of a specific channel; Measuring signal strength of the received wireless signal; Determining whether the specific channel is occupied based on the measured signal strength and BSS identifier information of the wireless signal; It provides a wireless communication method comprising a.
- the determining is performed based on a clear channel assessment (CCA) for the specific channel, and the CCA threshold value used for the CCA is determined whether the BSS identifier information of the radio signal is the same as the BSS identifier information of the terminal. It is set to different levels depending on whether or not.
- CCA clear channel assessment
- a first CCA threshold is used for the CCA
- the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal.
- a second CCA threshold at a level higher than the first CCA threshold is used for the CCA.
- the method may further include obtaining at least one of legacy wireless LAN information and non-legacy wireless LAN information using the preamble information of the received wireless signal, and the determining may include: determining the non-legacy from the wireless signal.
- the WLAN information is obtained, it is determined whether the specific channel is occupied based on the BSS identifier information of the radio signal.
- the present invention provides a wireless communication method of a terminal, comprising: receiving a radio signal of a specific channel; Measuring signal strength of the received wireless signal; Acquiring at least one of legacy wireless LAN information and non-legacy wireless LAN information using the preamble information of the received wireless signal; And when the measured signal strength is between a first clear channel assessment (CCA) threshold value and a second CCA threshold value and non-legacy WLAN information is obtained from the radio signal, based on the BSS identifier information of the radio signal. Determining whether the specific channel is occupied; It provides a wireless communication method comprising a.
- CCA clear channel assessment
- the BSS identifier information indicates abbreviated information of the BSS identifier for the radio signal.
- the determining may include determining whether the specific channel is occupied based on a result of comparing the BSS identifier information of the radio signal with the BSS identifier information of the terminal.
- the determining when the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal, it is determined that the specific channel is in an idle state.
- the determining may include determining that the specific channel is busy when the BSS identifier information of the radio signal is the same as the BSS identifier information of the terminal.
- the radio signal includes a first preamble for a legacy terminal and a second preamble for a non-legacy terminal, and the BSS identifier information of the radio signal is included in the second preamble of the radio signal. Extracted.
- the wireless signal includes a first preamble for a legacy terminal and a second preamble for a non-legacy terminal, and the first preamble includes a first subcarrier set for the legacy terminal.
- the non-legacy WLAN information is obtained from the second subcarrier set when the first preamble further comprises a second subcarrier set that is different from the first subcarrier set. .
- the BSS identifier information of the received radio signal is extracted from the information of the second subcarrier set of the first preamble.
- the wireless signal includes a first preamble for a legacy terminal and a second preamble for a non-legacy terminal, and based on information of preset bits of the first preamble, It is determined whether a wireless signal includes the non-legacy wireless LAN information.
- the radio signal includes a first preamble for a legacy terminal and a second preamble for a non-legacy terminal, and the BSS identifier information of the radio signal is extracted from a preset bit field of the first preamble. do.
- the preset bit of the preset bit field indicates whether the wireless signal includes non-legacy wireless LAN information, and when the preset bit indicates that the wireless signal includes non-legacy wireless LAN information.
- the BSS identifier information of the radio signal is extracted from the preset bit field.
- the first preamble includes at least a first subcarrier set for the legacy terminal, and the first preamble further includes a second subcarrier set different from the first subcarrier set.
- BSS identifier information of the radio signal is extracted from the preset bit field.
- the present invention provides a wireless communication method of a terminal, comprising: receiving a radio signal of a specific channel; Extracting BSS identifier information of the received wireless signal; Extracting length information from the radio signal when the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal, the length information indicating information related to a transmission completion time point of the radio signal; And adjusting a data transmission period of the terminal based on the extracted length information. It provides a wireless communication method comprising a.
- the length information indicates information of a duration field of the radio signal frame.
- the length information indicates TXOP (Transmission Opportunity) of the external terminal for transmitting the radio signal.
- the length information is obtained from at least one of a legacy preamble, a non-legacy preamble, and a MAC header of the radio signal.
- the data transmission period is adjusted to end before the transmission completion point of the radio signal according to the extracted length information.
- the data transmission period is adjusted to end earlier than the sum of the time of the short inter frame space (SIFS) and the time required for the transmission of the response message rather than the completion time of the transmission of the radio signal.
- SIFS short inter frame space
- the data transmission period may indicate a transmission opportunity (TXOP) of the terminal.
- TXOP transmission opportunity
- the step of measuring the signal strength of the wireless signal And determining whether the specific channel is occupied based on the measured signal strength and the extracted BSS identifier information, wherein the data transmission period is determined as the specific channel is idle. Adjusted when performing channel access.
- the determining may be performed based on a clear channel assessment (CCA) for the specific channel, and the CCA threshold value used for the CCA is determined whether the BSS identifier information of the radio signal is the same as the BSS identifier information of the terminal. It is set to different levels depending on whether or not.
- CCA clear channel assessment
- the first CCA threshold is used for the CCA
- the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal.
- a second CCA threshold at a level higher than the first CCA threshold is used for the CCA.
- the present invention provides a wireless communication method of a terminal, comprising: receiving a radio signal of a specific channel; Performing a CCA based on a second CCA threshold higher than a first Clear Channel Assessment (CCA) threshold value for a legacy terminal when the radio signal has different BSS identifier information from the terminal; Performing a backoff procedure when the channel is determined to be idle as a result of performing the CCA; Adjusting a backoff counter assigned to the terminal when the backoff procedure is stopped before the backoff counter of the backoff procedure expires; If the channel is idle again, resuming a backoff procedure using the adjusted backoff counter; It provides a wireless communication method comprising a.
- CCA Clear Channel Assessment
- the backoff counter assigned to the terminal is adjusted when the received signal strength of the radio signal during the backoff procedure is between the first CCA threshold and the second CCA threshold.
- the adjusting step restores the backoff counter to a value prior to the backoff procedure.
- the adjusting step allocates a new backoff counter for the terminal.
- the present invention provides a wireless communication method of a terminal, comprising: receiving a first backoff counter and a second backoff counter for a backoff procedure of the terminal; Receiving a radio signal having BSS identifier information different from that of the terminal; Performing a backoff procedure based on the received signal strength of the wireless signal, wherein the backoff procedure is performed when the received signal strength of the wireless signal is lower than a first clear channel assessment (CCA) threshold value for a legacy terminal. Consume one backoff counter and consume the second backoff counter when the received signal strength of the radio signal is above the first CCA threshold and below the second CCA threshold; If at least one of the first backoff counter and the second backoff counter has expired, transmitting data; It provides a wireless communication method comprising a.
- CCA clear channel assessment
- the first backoff counter and the second backoff counter are allocated in different random ranges.
- the present invention provides a wireless communication method of a terminal, comprising: receiving a request message (another BSS request message) having different BSS identifier information from the terminal; Receiving a response message (another BSS response message) corresponding to the other BSS request message; Determining whether the terminal accesses a channel based on the received signal strength of the other BSS request message and the received signal strength of the other BSS response message; It provides a wireless communication method comprising a.
- the channel of the terminal. Access is allowed, but the second CCA threshold is set at a level higher than the first CCA threshold.
- the terminal if the terminal is determined to access the channel, transmitting a request message (same BSS request message) indicating that the data transmission of the terminal to the receiving terminal; And transmitting data to the receiving terminal when the same BSS response message corresponding to the same BSS request message is received from the receiving terminal. It further includes.
- the terminal access is delayed.
- the request message is a Request-to-Send (RTS) message
- the response message is a Clear-to-Send (CTS) message.
- RTS Request-to-Send
- CTS Clear-to-Send
- the request message is a null data packet (NDP)
- the response message is an ACK
- the request message is a MAC Protocol Data Unit (MPDU)
- the response message is an ACK.
- MPDU MAC Protocol Data Unit
- the present invention provides a wireless communication method of a terminal, comprising: receiving a request message (another BSS request message) having different BSS identifier information from the terminal; Receiving a response message (another BSS response message) corresponding to the other BSS request message; Receiving from the transmitting terminal a request message (same BSS request message) having the same BSS identifier information as the terminal and serving as the receiver; Determining whether to transmit the same BSS response message corresponding to the same BSS request message based on the received signal strength of the other BSS request message and the received signal strength of the other BSS response message; It provides a wireless communication method comprising a.
- the same BSS response message indicates that data of the transmitting terminal can be received.
- the same BSS response The message is transmitted to the transmitting terminal, but the second CCA threshold is set to a level higher than the first CCA threshold.
- the request message is a Request-to-Send (RTS) message
- the response message is a Clear-to-Send (CTS) message.
- RTS Request-to-Send
- CTS Clear-to-Send
- the request message is a null data packet (NDP)
- the response message is an ACK
- the request message is a MAC Protocol Data Unit (MPDU)
- the response message is an ACK.
- MPDU MAC Protocol Data Unit
- the present invention provides a wireless communication terminal, comprising: a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the terminal, wherein the processor measures signal strength of a wireless signal of a specific channel received through the transceiver, and is based on the measured signal strength and BSS identifier information of the wireless signal.
- a wireless communication terminal for determining whether the specific channel is occupied.
- the processor acquires at least one of legacy wireless LAN information and non-legacy wireless LAN information using the preamble information of the received wireless signal, and the non-legacy wireless LAN information is obtained from the wireless signal, It is determined whether the specific channel is occupied based on the BSS identifier information of the radio signal.
- the processor may perform the determination based on a clear channel assessment (CCA) for the specific channel, and the CCA threshold value used for the CCA may be the same as the BSS identifier information of the terminal. It is set to different levels depending on whether or not it is.
- CCA clear channel assessment
- the present invention provides a wireless communication terminal, comprising: a transceiver for transmitting and receiving a wireless signal; And a processor configured to control an operation of the terminal, wherein the processor measures signal strength of a wireless signal of a specific channel received through the transceiver, and uses legacy WLAN information using preamble information of the received wireless signal. And obtaining at least one of non-legacy WLAN information, wherein the measured signal strength is between a first Clear Channel Assessment (CCA) threshold value and a second CCA threshold value, wherein the non-legacy WLAN information is obtained from the radio signal.
- CCA Clear Channel Assessment
- the present invention provides a wireless communication terminal for determining whether the specific channel is occupied based on BSS identifier information of the wireless signal.
- the present invention provides a wireless communication terminal, comprising: a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the terminal, wherein the terminal receives a radio signal of a specific channel through the transceiver, the processor extracts BSS identifier information of the received radio signal, and the BSS of the radio signal. If the identifier information is different from the BSS identifier information of the terminal, the length information is extracted from the radio signal, wherein the length information indicates information related to the transmission completion time of the radio signal, and based on the extracted length information Provided is a wireless communication terminal for adjusting a data transmission period of a terminal.
- the present invention provides a wireless communication terminal, comprising: a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the terminal, wherein the terminal receives a radio signal of a specific channel through the transceiver, and the processor is a legacy terminal when the radio signal has different BSS identifier information from the terminal.
- CCA Clear Channel Assessment
- the present invention provides a wireless communication terminal, comprising: a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the terminal, wherein the terminal receives a radio signal having BSS identifier information different from the terminal through the transceiver, and the processor is configured to perform a first back for a backoff procedure of the terminal.
- An off counter and a second backoff counter are allocated, and a backoff procedure is performed based on the received signal strength of the wireless signal, wherein the backoff procedure is performed by a first CCA for a legacy terminal.
- Clear Channel Assessment consumes the first backoff counter if it is lower than a threshold, and if the received signal strength of the radio signal is higher than the first CCA threshold and lower than a second CCA threshold, the second backoff counter. And transmit data when at least one of the first backoff counter and the second backoff counter expires.
- the present invention provides a wireless communication terminal, comprising: a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the terminal, wherein the terminal receives a request message (another BSS request message) having different BSS identifier information from the terminal through the transceiver, and responds to the other BSS request message. Receiving a message (another BSS response message), and the processor provides a wireless communication terminal for determining whether the terminal accesses a channel based on the received signal strength of the other BSS request message and the received signal strength of the other BSS response message. do.
- the present invention provides a wireless communication terminal, comprising: a transceiver for transmitting and receiving a wireless signal; And a processor for controlling an operation of the terminal, wherein the terminal receives a request message (another BSS request message) having different BSS identifier information from the terminal, and a response message (another BSS request message) corresponding to the other BSS request message. Response message) and a request message (same BSS request message) having the same BSS identifier information as that of the terminal and receiving the terminal from the transmitting terminal, and wherein the processor is configured to receive the received signal strength of the other BSS request message.
- the wireless communication terminal determines whether to transmit the same BSS response message corresponding to the same BSS request message based on the received signal strength of the other BSS response message.
- the present invention it is possible to efficiently determine whether the wireless signal received in the overlapped BSS environment is the WLAN signal of the same BSS, and based on this, it is possible to determine whether to adaptively use the corresponding channel. .
- the received wireless signal is a legacy wireless LAN signal from which BSS identifier information is not extracted
- whether the channel is occupied collectively is determined according to the received signal strength of the corresponding signal.
- the time delay required for additionally determining the BSS identifier of the WLAN signal can be minimized.
- the present invention when a WLAN signal having the same BSS identifier information as the terminal is received, different CCA thresholds are applied depending on whether the corresponding WLAN signal includes non-legacy WLAN information. Can solve inequality problems That is, by applying the CCA thresholds for the legacy signal and the non-legacy signal to the WLAN signal having the same BSS identifier information as the terminal, it is possible to maintain the equity of the channel occupancy between the legacy terminal and the non-legacy terminal. .
- CCA can be performed in a shorter time. Will be.
- the present invention when performing data transmission in the spatial reuse interval of the non-legacy terminal, it is possible to adjust the data transmission period of the corresponding terminal based on the length information extracted from the received radio signal. It is possible to solve the channel access delay problem of the legacy terminal.
- FIG. 1 is a view showing a wireless LAN system according to an embodiment of the present invention.
- FIG. 2 is a view showing a wireless LAN system according to another embodiment of the present invention.
- Figure 3 is a block diagram showing the configuration of a station according to an embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of an access point according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating a carrier sense multiple access (CSMA) / collision avoidance (CA) method used in wireless LAN communication.
- CSMA carrier sense multiple access
- CA collision avoidance
- FIG. 6 illustrates an embodiment of a wireless communication scheme using a CCA technique.
- FIG. 7 illustrates an example of an overlapping BSS environment.
- FIG. 8 to 10 illustrate various embodiments of a CCA method using BSS identifier information of a received wireless signal.
- 11 to 13 are diagrams illustrating another embodiment of a CCA method using BSS identifier information and whether non-legacy WLAN information is obtained from a received wireless signal.
- FIG. 14 illustrates a frame structure of a WLAN signal according to an embodiment of the present invention.
- FIG. 15 illustrates a method for representing BSS identifier information according to an embodiment of the present invention.
- FIG. 16 illustrates an embodiment of a subcarrier configuration used in a legacy preamble of a WLAN signal.
- FIG. 17 illustrates an embodiment of a subcarrier configuration used in a non-legacy wireless LAN signal.
- FIG. 18 illustrates a method of representing non-legacy WLAN information using a preset bit field of a legacy preamble.
- FIG. 19 illustrates an inequality problem of a legacy terminal that may occur when a CCA threshold adjusted according to an embodiment of the present invention is used for channel access.
- 20 to 23 are diagrams illustrating a data transmission method of a non-legacy terminal for solving a channel access delay problem of a legacy terminal.
- FIG. 24 illustrates another embodiment of solving an inequality problem of a legacy terminal that may be generated when a adjusted CCA threshold is used for channel access according to an embodiment of the present invention.
- 25 illustrates an interference problem that may occur when a CCA threshold adjusted in accordance with an embodiment of the present invention is used for channel access.
- 26 and 27 illustrate a data transmission method of a non-legacy terminal for minimizing an interference problem between terminals.
- FIG. 30 is a view showing another embodiment of a data transmission method of a non-legacy terminal to minimize the interference problem between terminals.
- 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. It includes both access points (APs) as well as non-AP stations.
- MAC medium access control
- AP access points
- terminal may refer to a non-AP STA or an AP, or may be used as a term indicating both.
- 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 an embodiment, it may refer to a control unit for individually controlling some components of the station 100, for example, the transceiver unit 120 and the like. It may be.
- 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 exemplary embodiment of the present invention, some components of the station 100, for example, 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 an embodiment of the present invention may be provided with two or more transmit / receive modules of different frequency bands, for example, 2.4 GHz, 5 GHz, and 60 GHz.
- the AP 200 may include a transmission / reception module using a frequency band of 6 GHz or more and a transmission / reception module using a frequency band of 6 GHz or less.
- Each transmit / receive module may perform wireless communication with a station according to a wireless LAN standard of a frequency band supported by the corresponding transmit / receive module.
- the transceiver 220 may operate only one transceiver module at a time or simultaneously operate multiple transceiver modules according to the performance and requirements of the AP 200.
- the memory 260 stores a control program used in the AP 200 and various data according thereto.
- a control program may include an access program for managing a connection of a station.
- the processor 210 may control each unit of the AP 200 and may control data transmission and reception between the units.
- the processor 210 may execute a program for accessing a station stored in the memory 260 and transmit a communication setting message for one or more stations.
- the communication setting message may include information on the access priority condition of each station.
- the processor 210 performs connection establishment according to a connection request of a station.
- the processor 210 controls various operations of wireless signal transmission and reception of the AP 200 according to an embodiment of the present invention. Specific embodiments thereof will be described later.
- CSMA carrier sense multiple access
- CA collision avoidance
- the terminal performing the WLAN communication performs carrier sensing before checking data to check whether the channel is occupied. If a wireless signal of a predetermined intensity or more is detected, it is determined that the corresponding channel is busy, and the terminal delays access to the corresponding channel. This process is called clear channel assessment (CCA), and the level for determining whether a corresponding signal is detected is called a CCA threshold. If a radio signal having a CCA threshold or higher received by the terminal uses the terminal as a receiver, the terminal processes the received radio signal. On the other hand, if a wireless signal is not detected in the corresponding channel or if a wireless signal having a strength smaller than the CCA threshold is detected, the channel is determined to be idle.
- CCA clear channel assessment
- each terminal having data to be transmitted performs a backoff procedure after a time such as Arbitration IFS (AIFS) or PIFS (PCF IFS) according to the situation of each terminal.
- AIFS Arbitration IFS
- PCF IFS PIFS
- the AIFS may be used as a configuration to replace the existing DIFS (DCF IFS).
- DIFS DIFS
- Each terminal waits while reducing the slot time corresponding to a random number allocated to the corresponding terminal during an interval of the idle state of the channel, and the terminal which has exhausted the slot time attempts to access the corresponding channel. Done.
- the interval in which each terminal performs the backoff procedure is called a contention window interval.
- the terminal may transmit data through the channel.
- each collided terminal receives a new random number and performs a backoff procedure again.
- the random number newly allocated to each terminal may be determined within a range (2 * CW) of twice the random number range (competition window, CW) previously allocated by the corresponding terminal.
- each terminal attempts access by performing a backoff procedure again in the next contention window section, and each terminal performs a backoff procedure from the slot time remaining in the previous contention window section. In this way, each of the terminals performing WLAN communication can avoid collisions with each other for a specific channel.
- FIG. 6 illustrates an embodiment of a wireless communication scheme using a CCA technique.
- the CCA method used may include a signal detection (SD) method, an energy detection (ED) method, a correlation detection (Correlation Detection, CD) method, and the like.
- SD signal detection
- ED energy detection
- CD correlation detection
- signal detection is a method of measuring signal strength of a preamble of a WLAN (ie, 802.11) frame. This method has the disadvantage that stable signal detection is possible but only operates at the initial part of the frame where the preamble is present.
- the signal detection may be used for the CCA for the primary channel in the broadband WLAN.
- energy detection is a method for detecting the energy of all signals received above a certain threshold. This method can be used to detect wireless signals that normally do not detect preambles, such as Bluetooth, Zigbee, and the like. The method may also be used for CCA on a secondary channel that does not keep track of the signal.
- the correlation detection is a method that can detect the signal level even in the middle of the WLAN frame, using the fact that the WLAN signal has a repetitive pattern of the periodic Orthogonal Frequency Division Multiplex (OFDM) signal. . That is, the correlation detection method detects signal strengths for repetitive patterns of OFDM signal symbols after receiving WLAN data for an arbitrary time.
- OFDM Orthogonal Frequency Division Multiplex
- the access of the terminal to the channel may be controlled by using a preset CCA threshold value for each CCA method.
- the CCA-ED threshold 10 represents a preset threshold for performing energy detection
- the CCA-SD threshold 30 represents a preset threshold for performing signal detection.
- the reception sensitivity represents the minimum signal strength that the terminal can decode the radio signal.
- the reception sensitivity 50 may be set to the same or lower level than the CCA-SD threshold 30 according to the performance and setting of the terminal.
- the CCA-ED threshold 10 may be set at a level higher than the CCA-SD threshold 30.
- the CCA-ED threshold 10 may be set to ⁇ 62 dBm, and the CCA-SD threshold 30 may be set to ⁇ 82 dBm, respectively.
- the present invention is not limited thereto, and the CCA-ED threshold 10 and the CCA-SD threshold 30 may be set differently according to whether the threshold is the primary channel, the bandwidth of the channel performing the CCA, and the like. Can be.
- each terminal measures the received signal strength (RX Received Signal Strength Indicator, RX RSSI) of the received wireless signal, and based on the comparison result of the measured received signal strength and each of the CCA thresholds set above To determine the channel status.
- RX RSSI Received Signal Strength Indicator
- the channel is idle. Is determined. Accordingly, the received signal is not processed or protected by the terminal, and each terminal may attempt to access the corresponding channel according to the method described with reference to FIG. 5.
- the terminal may determine whether the corresponding signal is a WLAN signal using a signal pattern of a preamble portion of the received wireless signal. According to the embodiment of FIG. 6, each terminal determines that the channel is occupied even when a WLAN signal of another BSS as well as a WLAN signal of the same BSS is received.
- the terminal determines that the corresponding channel is in the occupied state when the received signal strength of the corresponding signal is equal to or higher than the CCA-ED threshold value 10 even when a wireless signal other than the WLAN signal is received. Therefore, the terminal receiving the signal delays access to the channel.
- FIG. 7 illustrates an example of an overlapping BSS (OBSS) environment.
- OBSS overlapping BSS
- the STA-3 may continuously interfere with the STA-2 of the BSS-1 located nearby.
- CCI Co-Channel Interference
- interference generated when BSS-1 and BSS-2 use adjacent main channels is called Adjacent Channel Interference (ACI).
- the CCI or ACI may be received with a higher signal strength than the CCA threshold of the STA-2 (eg, the CCA-SD threshold) according to the distance between the STA-2 and the STA-3.
- the STA-2 recognizes that the channel is occupied and delays upload data transmission to the AP-1.
- STA-2 and STA-3 are stations belonging to different BSSs, when the CCA threshold of STA-2 is raised, STA-2 and STA-3 simultaneously upload to AP-1 and AP-2, respectively. This allows for the effect of spatial reuse.
- upload data transmission of STA-3 in BSS-2 also interferes with STA-4 belonging to the same BSS-2.
- the CCA threshold of the STA-4 is increased to be the same as that of the STA-2
- the STA-3 and the STA-4 belonging to the same BSS may simultaneously transmit upload data to the AP-2, thereby causing a collision. Therefore, to increase the CCA threshold for any interference, it is necessary to determine whether the interference is caused by a signal belonging to the same BSS or a signal belonging to another BSS.
- each terminal should check the BSS identifier of the received WLAN signal, or any other form of information that can distinguish the BSS.
- the confirmation of the BSS information is preferably performed within a short time the CCA process is performed.
- the shaded areas represent radio signals received by the terminal but ignored, i.e., not protected.
- the terminal determines that the corresponding channel is idle.
- the reception sensitivity RX Sensitivity
- the CCA-ED threshold may be set to a level higher than the CCA-SD threshold.
- the terminal may measure the received signal strength RX RSSI of the received wireless signal and determine whether the corresponding signal is a WLAN signal. If the received signal is a WLAN signal having BSS identifier information according to various embodiments to be described later, the terminal extracts BSS identifier information from the corresponding signal and whether the extracted BSS identifier information is the same as the BSS identifier information of the corresponding terminal. Can be determined.
- the CCA threshold for the corresponding signal may be determined based on whether the received wireless signal is a WLAN signal having the same BSS identifier information as the BSS identifier information of the terminal.
- the BSS identifier information of the terminal is BSS identifier information allocated to the terminal.
- identifier information of the AP that the terminal associates with or wants to combine for example, MAC address of the AP
- the terminal receives the BSS identifier information from the AP, the received BSS identifier information may be stored in the terminal.
- the corresponding signal is a terminal. It is determined whether the channel is occupied based on whether the WLAN signal has the same BSS identifier information as. If the BSS identifier information extracted from the radio signal is different from the BSS identifier information of the UE (that is, the OBSS WLAN signal 452), the corresponding channel is determined to be in an idle state. However, if the BSS identifier information extracted from the radio signal is the same as the BSS identifier information of the terminal (that is, in case of MYBSS WLAN signal 454), it is determined that the corresponding channel is occupied.
- RX RSSI reception signal strength
- the terminal receiving the wireless LAN signal 430 is not only a wireless LAN signal having the same BSS identifier information as the terminal, but also a wireless LAN signal having other BSS identifier information. It is determined that it is in the occupied state.
- the corresponding channel is determined to be occupied.
- RX RSSI received signal strength
- the CCA threshold applied to the WLAN signal having the same BSS identifier information as that of the UE is different from the CCA threshold applied to the WLAN signal having different BSS identifier information from the UE.
- the CCA threshold applied to the WLAN signal having different BSS identifier information from the UE may be set to a level higher than the CCA threshold applied to the WLAN signal having the same BSS identifier information as the UE.
- a preset CCA-SD threshold 30 may be applied as a CCA threshold value for a WLAN signal having different BSS identifier information from the terminal, and has a radio having the same BSS identifier information as the terminal.
- the reception sensitivity 50 level of the terminal may be applied.
- FIGS. 9 and 10 illustrate another embodiment of a CCA method using BSS identifier information.
- the same or corresponding parts as those of the embodiment of FIG. 8 will be omitted.
- the CCA threshold for the corresponding signal may be determined based on whether the received wireless signal is a WLAN signal having the same BSS identifier information as the BSS identifier information of the terminal.
- the channel is determined to be idle. do.
- the terminal idles the channel on which the signal is received for both the case where the received signal is the WLAN signal 454 having the same BSS identifier information as the terminal and the WLAN signal 452 having the other BSS identifier information. Determine as being in a state.
- the received radio signal of a specific channel is a WLAN signal having a received signal strength (RX RSSI) between the first CCA-SD threshold 40 and the second CCA-SD threshold 20
- the signal is Whether the channel is occupied is determined based on whether the WLAN signal has the same BSS identifier information as the terminal. If the BSS identifier information extracted from the radio signal is different from the BSS identifier information of the UE (that is, the OBSS WLAN signal 442), the corresponding channel is determined to be in an idle state. However, if the BSS identifier information extracted from the radio signal is the same as the BSS identifier information of the terminal (that is, the MYBSS WLAN signal 444), the corresponding channel is determined to be occupied.
- RX RSSI received signal strength
- the second CCA-SD threshold 20 is for performing signal detection for a WLAN signal having different BSS identifier information from the terminal, and is larger than the first CCA-SD threshold 40.
- the level may be set to a level less than or equal to the CCA-ED threshold.
- the received wireless signal of a specific channel is a WLAN signal 420 having a received signal strength (RX RSSI) between the second CCA-SD threshold 20 and the CCA-ED threshold 10, the corresponding The channel is determined to be occupied.
- the terminal receiving the wireless LAN signal 420 not only is not only the WLAN signal having the same BSS identifier information as the terminal but also the wireless LAN signal having the other BSS identifier information. It is determined that it is in the occupied state.
- the corresponding channel is determined to be occupied.
- RX RSSI received signal strength
- the CCA threshold applied to the WLAN signal having the same BSS identifier information as that of the UE is different from the CCA threshold applied to the WLAN signal having different BSS identifier information from the UE.
- a preset first CCA-SD threshold 40 may be applied as a CCA threshold value for the WLAN signal having the same BSS identifier information as the terminal, and for a WLAN signal having different BSS identifier information from the terminal.
- a second preset CCA-SD threshold 20 may be applied as the CCA threshold.
- the second CCA-SD threshold 20 may be set higher than the first CCA-SD threshold 40 and lower than or equal to the CCA-ED threshold.
- the received signal strength (RX RSSI) of the received radio signal of a specific channel is more than the reception sensitivity 50, whether the signal is a WLAN signal having the same BSS identifier information as the terminal Signal detection may be performed based on.
- the corresponding channel is occupied. Is determined to be. However, when the received signal strength RX RSSI of the received radio signal is greater than or equal to the reception sensitivity 50 and the WLAN signal 451 having different BSS identifier information from the terminal, the corresponding channel is determined to be idle.
- the corresponding channel is determined to be occupied.
- the terminal determines whether the corresponding channel is occupied regardless of whether the corresponding signal is a WLAN signal having the same BSS identifier information as the terminal, and whether the corresponding signal is a WLAN signal. Therefore, when a WLAN signal having different BSS identifier information from the UE is received at a level higher than the CCA-ED threshold 10, the corresponding channel is determined to be occupied by the energy detection process.
- the terminal does not use a separately set CCA-SD threshold value and is based on whether the received wireless signal is a WLAN signal having the same BSS identifier information as the terminal. It is possible to determine whether the channel is occupied.
- the terminal may use the preset CCA-ED threshold value 10 for energy detection, thereby avoiding collision with a WLAN signal having different BSS identifier information from the terminal.
- the terminal may measure the received signal strength RX RSSI of the received wireless signal and determine whether the corresponding signal is a WLAN signal. If the received signal is a WLAN signal having BSS identifier information according to various embodiments to be described later, the terminal extracts BSS identifier information from the corresponding signal and whether the extracted BSS identifier information is the same as the BSS identifier information of the corresponding terminal. Can be determined.
- the terminal may obtain at least one of legacy WLAN information and non-legacy WLAN information from the received radio signal. Through this, the terminal may determine whether the received wireless signal is a signal including only legacy WLAN information or a signal including both legacy WLAN information and non-legacy WLAN information. According to an embodiment, the terminal may acquire at least one of legacy WLAN information and non-legacy WLAN information by using preamble information of the received wireless signal.
- the BSS identifier information of the wireless signal may be extracted from the non-legacy wireless LAN information when the non-legacy wireless LAN information is obtained from the corresponding signal.
- the present invention is not limited thereto and may be extracted from legacy WLAN information according to various embodiments described below.
- the BSS identifier information referred to for performing CCA is included in the non-legacy wireless LAN information, whereas the received wireless signal may not include the non-legacy wireless LAN information. That is, when the received radio signal does not include BSS identifier information referred to for performing CCA according to an embodiment of the present invention, the BSS identifier information may not be extracted from the corresponding signal. In this case, the BSS identifier information of the corresponding signal for performing the CCA may be set to a predetermined value.
- the received wireless signal is a legacy wireless LAN signal that does not include BSS identifier information according to an embodiment of the present invention
- other information of the corresponding signal such as PBSSID (Partial BSSID) and PAID (Partial Association ID)
- BSS identifier information of a corresponding signal may be estimated using PHY layer header information, a signal pattern of a specific preamble, and the like.
- PHY layer header information a signal pattern of a specific preamble
- a received wireless signal of a specific channel is a wireless LAN signal having a reception sensitivity 50 or more and a reception signal strength (RX RSSI) below the first CCA-SD threshold 40.
- RX RSSI reception signal strength
- the corresponding channel is determined to be in an idle state.
- the OBSS WLAN signal 552 may be an OBSS non-legacy WLAN signal from which the non-legacy WLAN information may be obtained from the corresponding signal, and an OBSS legacy WLAN from which the non-legacy WLAN information is not obtained from the corresponding signal. It can be divided into signals.
- the terminal determines that the corresponding channel is in an idle state both when the OBSS non-legacy wireless LAN signal is received and when the OBSS legacy wireless LAN signal is received.
- the corresponding channel is determined to be occupied state.
- the MYBSS WLAN signal includes a MYBSS non-legacy WLAN signal 558 in which non-legacy WLAN information may be obtained from the signal, and a MYBSS legacy WLAN in which non-legacy WLAN information is not obtained from the signal. It may be divided into a signal 556.
- the terminal determines that the corresponding channel is in the occupied state both when the MYBSS non-legacy wireless LAN signal 558 is received and when the MYBSS legacy wireless LAN signal 556 is received.
- the received wireless signal of a specific channel is a WLAN signal having a received signal strength (RX RSSI) between the first CCA-SD threshold 40 and the second CCA-SD threshold 20, the corresponding signal.
- Whether the channel is occupied is determined based on whether the non-legacy wireless LAN information is included and whether the terminal has the same BSS identifier information as the terminal.
- the first CCA-SD threshold 40 may be set to the same level as the CCA-SD threshold applied to the legacy terminal, and the second CCA-SD threshold 20 is the first CCA. It may be set at a level higher than the SD threshold 40 and lower than or equal to the CCA-ED threshold.
- the channel is idle. Is determined. However, in other cases, that is, when non-legacy wireless LAN information is not obtained from the wireless signal (i.e., legacy signal), or the BSS identifier information of the corresponding signal is the same as the BSS identifier information of the terminal (i.e., MYBSS signal), The channel is determined to be occupied.
- non-legacy wireless LAN information is not obtained from the radio signal, and the BSS identifier information of the corresponding signal is different from the BSS identifier information of the terminal (that is, Legacy OBSS signal 544), ii) non-legacy wireless LAN information is not obtained from the wireless signal, the BSS identifier information of the signal is the same as the BSS identifier information of the terminal (that is, legacy MYBSS signal 546) and iii) Non-legacy WLAN information is obtained from the radio signal, and the BSS identifier information of the corresponding signal is the same as the BSS identifier information of the UE (that is, the non-legacy MYBSS signal 548).
- the non-legacy wireless LAN information when the non-legacy wireless LAN information is not obtained from the wireless signal, it is determined that the corresponding channel is occupied state, but when the non-legacy wireless LAN information is obtained from the wireless signal, the BSS identifier information of the corresponding signal is determined by Whether the channel is occupied is determined based on whether it is equal to the BSS identifier information. Therefore, according to an embodiment of the present invention, when non-legacy wireless LAN information is obtained from a wireless signal, whether or not the corresponding channel is occupied may be determined based on BSS identifier information of the wireless signal.
- BSS identifier information referred to for performing CCA of the present invention may not be extracted from the corresponding signal.
- the terminal may determine that the channel is in the occupied state regardless of whether BSS identifier information is extracted from the corresponding signal.
- This signal detection process may be performed with reference to the preamble of the received wireless signal. According to one embodiment, if it is determined that the channel is occupied in the signal detection process, even if the received signal strength (RX RSSI) falls below the first CCA-SD threshold 40 during the reception of the protected radio signal, The terminal may not access the channel during the frame transmission time of the radio signal.
- RX RSSI received signal strength
- the corresponding channel is determined to be occupied.
- the terminal receiving the wireless LAN signal 520 is irrelevant to whether the non-legacy wireless LAN information is obtained from the corresponding signal, and further, whether the corresponding signal is a wireless LAN signal having the same BSS identifier information as the terminal. It is determined that the channel in which the signal is received is occupied without.
- the radio signal of the specific channel received by the terminal is the radio signal 510 of the CCA-ED threshold 10 or more, it is determined that the channel is occupied.
- the terminal is occupied when the received signal strength (RX RSSI) of the wireless signal is greater than or equal to the CCA-ED threshold value 10. It is determined that.
- the received radio signal of a specific channel is a WLAN signal having a reception signal strength (RX RSSI) equal to or greater than the reception sensitivity 50 and less than or equal to the first CCA-SD threshold 40.
- RX RSSI reception signal strength
- whether or not the channel is occupied is determined based on whether the corresponding signal includes non-legacy WLAN information and whether the corresponding signal has the same BSS identifier information as the terminal.
- the channel is occupied state Is determined.
- the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal (that is, the OBSS signal), or if the non-legacy WLAN information is not obtained from the signal (that is, the legacy signal).
- the channel is determined to be idle.
- non-legacy wireless LAN information is obtained from the radio signal, and the BSS identifier information of the corresponding signal is different from the BSS identifier information of the terminal (ie, non-legacy).
- the non-legacy wireless LAN information is not obtained from the radio signal, the BSS identifier information of the signal is different from the BSS identifier information of the terminal (that is, the legacy OBSS signal 554) and iii ) Non-legacy wireless LAN information is not obtained from the wireless signal, and the BSS identifier information of the corresponding signal is the same as the BSS identifier information of the terminal (that is, the legacy MYBSS signal 556).
- the corresponding channel is determined to be in an idle state, but when the non-legacy wireless LAN information is obtained from the wireless signal, the BSS identifier information of the corresponding signal is determined by the terminal. Whether the channel is occupied is determined based on whether it is equal to the BSS identifier information.
- the preset CCA threshold 20 is the CCA of the corresponding channel. It can be used to.
- the signal is received signal strength of the reception sensitivity 50 or more without setting of a separate CCA threshold value If it has a can be determined that the channel is occupied state.
- BSS identifier information referred to for performing CCA of the present invention may not be extracted from the corresponding signal. In this case, the terminal may determine that the channel is in an idle state regardless of whether BSS identifier information is extracted from the corresponding signal.
- the terminal may additionally check the BSS identifier information to determine the idle state / occupation state of the channel.
- the channel when the received signal strength RX RSSI of the radio signal of the specific channel received is greater than or equal to the reception sensitivity 50 and less than or equal to the first CCA-SD threshold 40, the channel is idle. It is determined to be in a state. In this case, the terminal determines that the corresponding channel is in an idle state regardless of whether the received signal includes non-legacy wireless LAN information and whether the terminal has the same BSS identifier information as the terminal.
- the first CCA-SD threshold 40 corresponds to the corresponding channel.
- the second CCA-SD threshold higher than the first CCA-SD threshold 40 is obtained.
- the value 20 may be used for the CCA of that channel.
- an inequality to which different CCA thresholds are applied depends on whether the corresponding WLAN signal includes non-legacy WLAN information. It can solve the problem. That is, by applying the same CCA thresholds for the legacy MYBSS signal and the non-legacy MYBSS signal, it is possible to maintain the equity of the channel occupancy between the legacy terminal and the non-legacy terminal.
- a CCA process when a radio signal having a received signal strength RX RSSI equal to or greater than the first CCA-SD threshold 40 is received is the same as the embodiment of FIG. 11 described above. Can be performed.
- a WLAN signal according to an embodiment of the present invention may include a legacy preamble 710 and a non-legacy terminal (eg, 802.11ax terminal) for a legacy terminal (eg, a terminal such as 802.11a / g). And may comprise a non-legacy preamble 720.
- the legacy preamble 710 may include legacy WLAN information decodable by the legacy terminal, such as L-STF, L-LTF, L-SIG field.
- the non-legacy preamble 720 may include non-legacy wireless LAN information that can be decoded only in the non-legacy terminal, and the non-legacy wireless LAN information may not be decoded in the legacy terminal.
- the legacy preamble 710 may include at least some non-legacy wireless LAN information that can be decoded by the non-legacy terminal.
- the non-legacy preamble 720 may include information in which at least one field of the legacy preamble 710, such as part or all of the L-SIG field, is repeated.
- BSS identifier information referred to for performing CCA may be included in the non-legacy preamble 720 as non-legacy wireless LAN information.
- the BSS identifier information may be extracted from a preset bit field of the non-legacy preamble 720.
- the BSS identifier information may be extracted from additional information of the legacy preamble 710.
- the legacy preamble 710 may include non-legacy wireless LAN information through an additional subcarrier set or the like as described below, and the BSS identifier information may include the non-legacy radio included in the legacy preamble 710. Can be obtained from the LAN information.
- the BSS identifier information may be extracted from a preset bit field of the legacy preamble 710.
- the preset bit field of the legacy preamble 710 may be a bit field set for the legacy terminal, and may use the value of the corresponding bit field as BSS identifier information under a specific condition as described below.
- the BSS identifier information may be represented by a preset bit field of the non-legacy preamble 720 of FIG. 14.
- the BSS identifier information is abbreviated information of the BSS identifier assigned to each BSS, and may be information having fewer bits than the actual BSS identifier. For example, when a BSS identifier is represented by 24 bits of information in a specific WLAN system, the BSS identifier information may be represented by a bit field having a preset length in a range of 1 bit to 23 bits.
- the BSS identifier information is information obtained by dividing the actual BSS identifier into a predetermined category, and may also be referred to as a BSS color.
- a method of acquiring the abbreviated BSS color from the actual BSS identifier there is a method of using a combination of bit values of a predetermined position of the BSS identifier, and a method of using a result value of applying a predetermined hash function to the BSS identifier. .
- FIG. 15 illustrates a result of acquiring the BSS color using the last three bit values of the BSS identifier as an embodiment thereof.
- the BSS color may be included in the preamble of the WLAN signal with less information than the actual BSS identifier. Accordingly, each terminal may determine whether the received WLAN signal is a signal having the same BSS identifier as the corresponding terminal within a short time. It can be determined efficiently.
- Such BSS identifier information may be represented by predetermined bits of the non-legacy preamble.
- the non-legacy preamble 720 may include a repeated L-SIG field, and the repeated L-SIG field may include at least a portion of the L-SIG field of the legacy preamble 710.
- the bits can be set to be the same.
- a bit different from the L-SIG field of the legacy preamble 710 among the bits of the repeated L-SIG field may indicate BSS identifier information, bandwidth information of the system, non-legacy WLAN system information, channel information, and the like.
- additional information may be transmitted through a modulation method applied to the repeated L-SIG field. That is, the repeated L-SIG field may be represented by the same modulation value as the L-SIG field of the legacy preamble 710 or may be represented by an opposite modulation value. In this case, the opposite modulation value may appear through a phase shift between modulation symbols transmitted in the L-SIG of the legacy preamble 710 and modulation symbols in the repeated L-SIG, and additional information may be transmitted through the amount of phase change. have.
- the symbols of both fields have the same phase, and (1, -1) is multiplied.
- the phase shift of 180 degrees occurs between the repeated symbols of the L-SIG and the symbols of the legacy preamble 710.
- specific flag information for the non-legacy wireless LAN information may be determined according to whether the repeated L-SIG field is represented with the same modulation value as the L-SIG field of the legacy preamble 710, for example, non-legacy.
- the SIG-A field of the preamble is of variable length, whether the non-legacy preamble includes the SIG-B field, whether the particular bit field of the non-legacy preamble (or legacy preamble) indicates BSS identifier information Can be determined.
- 16 and 17 illustrate another method of acquiring non-legacy WLAN information using an additional subcarrier set of WLAN signals.
- FIG. 16 illustrates an embodiment of a subcarrier configuration used in a legacy preamble of a WLAN signal.
- the subcarrier set of the legacy preamble of the non-legacy WLAN signal may be configured identically to the subcarrier set of the legacy WLAN signal. That is, the subcarrier set of the legacy preamble may consist of a total of 52 subcarriers including 4 pilot subcarriers and 48 data subcarriers in a bandwidth of 20 MHz. At this time, the number of each subcarrier is -26, -25,... , -2, -1, 1, 2,...
- subcarriers with numbers -21, -7, 7, and 21 are used as pilot subcarriers, and the remaining subcarriers are used as data subcarriers.
- the basic configuration of such a subcarrier is necessary to maintain compatibility with each other in an environment in which a legacy WLAN system (such as 802.11 a / g) and a non-legacy WLAN system (such as 802.11 ax) coexist. That is, the legacy preamble of the non-legacy wireless LAN signal as well as the legacy wireless LAN signal may have a subcarrier configuration as shown in FIG. 16 to provide backward compatibility for the legacy terminal.
- a subcarrier of a non-legacy WLAN signal may include a first subcarrier set 800 and a second subcarrier set 820. More specifically, the first subcarrier set 800 may be configured to be the same as the subcarrier set of the legacy WLAN signal shown in FIG. 16.
- the second subcarrier set 820 is a subcarrier set different from the first subcarrier set 800, and according to an embodiment, the second subcarrier set 820 has two upper and lower indices of the first subcarrier set 800. It may include four additional subcarriers.
- this subcarrier configuration may be used after the legacy preamble part of the non-legacy WLAN signal.
- the non-legacy terminal may obtain information through a total of 56 subcarriers in the non-legacy preamble and data fields of the received non-legacy wireless LAN signal.
- the second subcarrier set 820 included in the non-legacy preamble may indicate BSS identifier information, system bandwidth information, non-legacy WLAN system information, channel information, and the like.
- a separate parity bit for parity check of the second subcarrier set 820 may be included in the non-legacy preamble.
- the non-legacy preamble includes the repeated L-SIG field as described above, the BSS identifier information, bandwidth information of the system, non-legacy WLAN system information, channel information, and the like are repeated.
- the second subcarrier set 820 of the L-SIG field may be represented.
- the subcarrier configuration of FIG. 17 may be extended to a legacy preamble of a non-legacy wireless LAN signal. That is, the legacy preamble of the non-legacy WLAN signal may further include a second subcarrier set 820, and may transmit non-legacy WLAN information through the second subcarrier set 820.
- the legacy terminal may not obtain information from the second subcarrier set 820, but the non-legacy terminal may obtain additional information from the second subcarrier set 820 of the legacy preamble.
- the index (ie, the subcarrier number) of the corresponding subcarrier is -28,-as shown in FIG. 27, 27 and 28, respectively.
- the BPSK modulation scheme is used for the legacy preamble and the same modulation scheme is applied to the second subcarrier set
- a total of 4 bits of information may be additionally transmitted.
- the QPSK modulation scheme is applied to the second subcarrier set
- a total of 8 bits of information may be additionally transmitted.
- the parity bit for parity check of the second subcarrier set included in the legacy preamble may be included in the non-legacy preamble.
- the second subcarrier set 820 may use only some bits for transmitting additional information for compatibility with the parity check of the legacy preamble. That is, information added by the second subcarrier set 820 for compatibility with parity bits used in the L-SIG may have even parity evenly, and a BPSK modulation scheme.
- information that can be transmitted through the second subcarrier set 820 may be 1010, 0101, 1100, 0011, 1001, 0110, 1111, and 0000, which may be a total of 3 bits of information.
- specific bits of the second subcarrier set 820 may be used as parity check bits, and the remaining bits may be used for transmitting additional information.
- three bits of four bits of the second subcarrier set 820 may be used for transmitting additional information, and one bit may be used as a parity bit.
- the parity bits of the second subcarrier set 820 may be used for parity check for bits added by the second subcarrier set 820, and the entire L-SIG including the second subcarrier set 820. Can also be used for parity check on.
- the parity check may be performed using the existing parity bits of the L-SIG for the legacy WLAN signal, and the existing parity bits and the second subcarrier set of the L-SIG for the non-legacy WLAN signal.
- the parity check is performed by using the parity bits of 820 together to enable more reliable parity check.
- the non-legacy WLAN information added by the second subcarrier set 820 may be performed by using a reserved bit of the L-SIG.
- the non-legacy terminal acquires the additional information from the legacy preamble of the received WLAN signal more quickly and uses the same. It can be used to reduce the initial connection delay or detection of unnecessary preambles, headers and packets.
- the non-legacy terminal may obtain the non-legacy wireless LAN information from the second subcarrier set 820 of the legacy preamble, the non-legacy wireless LAN information obtained at this time BSS identifier information, system bandwidth information, non-legacy WLAN system information, channel information, and the like may be included.
- the non-legacy terminal may recognize that the corresponding WLAN signal includes non-legacy WLAN information.
- FIG. 17 has described an embodiment in which four additional data subcarriers are included in the second subcarrier set 820, the present invention is not limited thereto, and a different number of subcarriers may be set in the second subcarrier set. 820 may be included.
- the embodiment of FIG. 17 may be applied not only when the bandwidth of the WLAN signal is 20 MHz but also when other bandwidths such as 40 MHz, 80 MHz, and 160 MHz are used.
- FIG. 18 illustrates a method for representing non-legacy WLAN information using a preset bit field of a legacy preamble according to another embodiment of the present invention.
- non-legacy wireless LAN information may be extracted from a preset bit field of the legacy preamble under a specific condition.
- FIG. 18 illustrates a rate bit field included in the L-SIG of the legacy preamble as an embodiment thereof.
- the fourth bit of the rate bit field is always set to one. Therefore, information on the data rate, modulation scheme, and code rate of the legacy WLAN signal could be obtained through the first three bit values in the rate bit field. Therefore, according to an embodiment of the present invention, it may be determined whether the corresponding rate bit field represents non-legacy WLAN information based on the value of the fourth bit of the rate bit field.
- the corresponding Rate bit field may indicate existing information, that is, a data rate, a modulation scheme, and a code rate. However, if the fourth bit of the Rate bit field has a value of 0, the corresponding Rate bit field may indicate non-legacy WLAN information.
- BSS identifier information may be extracted from three bits of the preceding bit field.
- non-legacy wireless LAN information such as bandwidth information, channel information, and association identifier (AID) of the non-legacy wireless LAN signal may be extracted from the rate bit field.
- AID association identifier
- actual rate information for the non-legacy terminal may be transmitted through the non-legacy preamble.
- the legacy terminal may interpret it as rate information.
- legacy terminals may use the L-SIG length information of another terminal packet to delay transmission (NAV configuration, etc.) when transmission delay is needed due to transmission of another terminal. ) Can be performed. More specifically, since the length field of the legacy preamble indicates the size (bytes) of the transmission data, the transmission bit number information per OFDM symbol is obtained based on a modulation and coding scheme (MCS) of the rate bit field. By dividing the length field using this, the number of required OFDM symbols can be known. In this case, NAV (Network Allocation Vector) setting may be performed according to the number of acquired OFDM symbols. According to an embodiment of the present invention, when a rate bit field is used as non-legacy wireless LAN information, a length field may be adjusted. NAV can be set as long as possible.
- the corresponding legacy preamble includes the non-legacy WLAN information based on information of a predetermined specific bit of the legacy preamble. If it is determined that the legacy preamble includes non-legacy wireless LAN information, non-legacy wireless LAN information such as BSS identifier information may be extracted from a predetermined bit field, for example, a rate bit field, of the legacy preamble.
- more bits of information may be obtained by using a combination of the aforementioned second subcarrier set of the legacy preamble and the specific bit field (that is, the rate bit field).
- Non-legacy wireless LAN information can be delivered.
- the legacy preamble is further configured to include a second subcarrier set
- the non-legacy terminal determines that the corresponding legacy preamble includes the non-legacy WLAN information, and all four bits of the Rate bit field or BSS identifier information can be extracted from a part.
- the non-legacy terminal may interpret the entire L-SIG bit field of the legacy preamble as non-legacy WLAN information.
- At least a part of the non-legacy wireless LAN information such as BSS identifier information may be obtained from the legacy preamble before the non-legacy preamble is identified, and thus, CCA may be performed in a shorter time. Will be.
- FIG. 19 illustrates an inequality problem of a legacy terminal that may occur when the adjusted CCA threshold is used for channel access according to an embodiment of the present invention.
- the MT MYBSS Transmitter
- MR MYBSS Receiver
- OT OBSS Transmitter
- OR OBSS Receiver
- L L is a legacy terminal.
- the terminal OT may transmit data O_DATA to the terminal OR, and the terminal OR may transmit a response message O_ACK to the terminal OT in response to the received data O_DATA.
- the legacy terminal L located near the terminal OT and the OR determines that the channel is occupied and accesses the channel. Do not perform.
- the channel access deferral period 810 of the legacy terminal L may be set until the transmission of the response message (O_ACK) of the terminal OR.
- the terminal MT of MYBSS which is a BSS different from the OBSS, determines whether to occupy the channel based on the received signal strength of the radio signal O_DATA and the BSS identifier information of the corresponding signal as in the above-described embodiment. That is, when the BSS identifier information of the received radio signal O_DATA is different from the BSS identifier information of the corresponding terminal, the terminal MT performs CCA based on the aforementioned second CCA threshold value (CCA-SD 2). At this time, the second CCA threshold (CCA-SD 2) has a higher level than the first CCA threshold (CCA-SD 1) used in the legacy terminal.
- the terminal MT determines the channel as idle and performs channel access. That is, the terminal MT performs a backoff procedure and transmits data MY_DATA when the backoff counter of the backoff procedure expires.
- the terminal MR receiving the MY_DATA from the terminal MT transmits a response message (MY_ACK) correspondingly.
- the legacy terminal L is an additional period after the channel access deferral period 810.
- the channel is not accessible.
- TXOP Transmission Opportunity
- A-MPDU Aggregate MPDU
- MPDU MultiMedia Data Unit
- 20 to 23 illustrate a data transmission method of a non-legacy terminal for solving a channel access delay problem of a legacy terminal.
- FIG. 20 illustrates a frame structure of a non-legacy wireless LAN signal according to an embodiment of the present invention.
- a non-legacy wireless LAN signal includes a preamble 910, an L-SIG field 920 for a legacy terminal (eg, 802.11a / g, etc.), and a non-legacy terminal (eg, 802.11ax).
- HEW-SIG field 930 and MAC header 940 for the terminal may represent at least a portion of the legacy preamble
- the HEW-SIG field 930 may represent at least a portion of the non-legacy preamble.
- the L-SIG field 920, the HEW-SIG field 930, and the MAC header 940 each include length information indicating a transmission length of data.
- the length information included in the L-SIG 920 is LEN-1 and the length information included in the HEW-SIG 930 is LEN-2
- the length information included in the MAC header 940 is LEN-3.
- LEN-1 is a length field of L-SIG 920
- LEN-2 is a length field of HEW-SIG 930
- LEN-3 is a MAC field.
- Each of the duration fields of the header 940 may be referred to, but the present invention is not limited thereto.
- LEN-1 represents length information of a corresponding frame.
- the length information of the frame may be expressed as time information required to transmit the frame, or may be expressed as data size (byte number) information or the like that may be inferred from the time required for the transmission in combination with other information.
- LEN-2 may indicate length information until the transmission of the frame and the frames associated with it are completed.
- the associated frames include subsequent frames of the corresponding frame.
- the LEN-2 may indicate length information until transmission of the corresponding frame and the frames associated with it is completed until the next contention window section is activated.
- the associated frames include not only a subsequent frame of the corresponding frame but also an acknowledgment (ACK) frame corresponding to each transmitted frame.
- ACK acknowledgment
- the length information indicated by LEN-2 is referred to as "total transmission length information" in the embodiment of the present invention.
- the LEN-2 may indicate information of a duration field of a corresponding frame, or may indicate length information of a transmission opportunity (TXOP) guaranteed to a terminal transmitting the corresponding frame.
- TXOP transmission opportunity
- LEN-3 indicates any length defined by the MAC.
- LEN-1 and LEN-2 may represent the entire transmission length information. If LEN-1 represents length information (eg, total transmission length information) exceeding the length of the frame, the frame may further include L-SIG Length Extend (LLE) information indicating this. Similarly, if LEN-2 indicates length information (eg, total transmission length information) exceeding the length of the frame, the frame may further include HEW-SIG Length Extend (HLE) information indicating this.
- LLE L-SIG Length Extend
- a terminal having data to be transmitted receives a non-legacy wireless LAN signal (ie, a non-legacy wireless LAN signal of another BSS) having different BSS identifier information from the corresponding terminal, the terminal is subjected to the CCA procedure according to the above-described embodiment.
- Channel access can be performed based on this.
- the terminal uses at least one information of LEN-1, LEN-2, and LEN-3 of the non-legacy wireless LAN signal of the other BSS received, the data transmission period of the corresponding terminal Adjust If the terminal transmits a single frame, the data transmission period means the duration of the frame, and if the terminal transmits a plurality of frames continuously, the data transmission period means the TXOP (Transmission Opportunity) of the terminal. can do. Specific embodiments thereof will be described with reference to FIGS. 21 through 23.
- FIG. 21 illustrates an embodiment of adjusting a data transmission period of a terminal based on length information of a received WLAN signal.
- the terminal OT of the OBSS transmits data O_DATA to the terminal OR, and the terminal OR transmits a response message O_ACK to the terminal OT in response to the received data O_DATA.
- the terminal MT transmits the data MY_DATA while O_DATA is transmitted, the terminal MT extracts the length information LEN (O_DATA) from the received radio signal O_DATA and based on the extracted length information LEN (O_DATA), Adjust the transmission period.
- the extracted length information LEN (O_DATA) includes at least one of LEN-1, LEN-2, and LEN-3 extracted from O_DATA.
- LEN-1 may indicate length information of O_DATA
- LEN-2 may indicate total transmission length information of O_DATA + SIFS + O_ACK.
- the terminal MT adjusts the transmission period of MY_DATA to be transmitted by the terminal to be terminated at the same time as the transmission completion time of the radio signal O_DATA based on the length information LEN (O_DATA) extracted from O_DATA. That is, the terminal MT adjusts the length of MY_DATA to be transmitted by the terminal to LEN (O_DATA) or less.
- the WLAN data MY_DATA of the terminal MT may be transmitted in the form of a PPDU (PLCP Protocol Data Unit), and the terminal MT may adjust the length of MY_DATA in various ways.
- the terminal MT may reduce the length of MY_DATA by performing fragmentation on the MPDU based on the extracted length information.
- the terminal MT limits the number of MPDUs included in the A-MPDU based on the extracted length information, or fragments individual MPDUs to lengthen MY_DATA. Can be reduced.
- the terminal MT may refer to LLE information and / or HLE information of O_DATA when adjusting the length of MY_DATA.
- the legacy terminal L when the transmission period of MY_DATA ends at the same time as the completion of O_DATA transmission, the response message MY_ACK of the terminal MR and the response message O_ACK of the terminal OR are simultaneously transmitted.
- MY_ACK and O_ACK are simultaneously received by the legacy terminal L, the legacy terminal L recognizes that a collision 830 between data has occurred. Accordingly, the legacy terminal L may access a channel after Extended Inter Frame Spacing (EIFS) longer than AIFS after transmission of response messages MY_ACK and O_ACK.
- EIFS Extended Inter Frame Spacing
- FIG. 22 illustrates another embodiment in which the data transmission period of the terminal is adjusted based on the length information of the received WLAN signal.
- the same or corresponding parts as those of the embodiment of FIG. 21 will be omitted.
- the terminal MT adjusts the transmission period of MY_DATA to be transmitted by the terminal to be terminated before the completion of the transmission of the radio signal O_DATA based on the length information LEN (O_DATA) extracted from the O_DATA. That is, the terminal MT adjusts the length of MY_DATA to be transmitted by the terminal to less than LEN (O_DATA). More specifically, referring to FIG. 22, the terminal MT sets the length of MY_DATA to LEN (O_DATA)? LEN (MY_ACK)? Set below SIFS.
- LEN (MY_ACK) represents the length of MY_ACK.
- the terminal MT sets the transmission period of MY_DATA to end more than the sum of the time required for the transmission of the response message (MY_ACK) and the time of SIFS than the completion of the transmission of O_DATA. Therefore, in the embodiment of FIG. 22, the transmission of MY_DATA and the corresponding MY_ACK ends within the transmission period of O_DATA.
- the terminal MT may attempt data transmission while the O_ACK is transmitted.
- arbitrary information is inserted into certain preset messages, such as request-to-end (RTS), clear-to-send (CTS), and ACK message, and a message including the information is included. If received, it may not allow adjustment of the CCA threshold according to the above-described embodiment. That is, the UEs of the other BSSs receiving the message perform channel access based on the first CCA threshold (CCA-SD 1) instead of the second CCA threshold (CCA-SD 2).
- all terminals including the legacy terminal attempt to access the channel when the channel is idle for the time of AIFS after O_ACK transmission of the terminal OR is completed. Therefore, a fair channel access opportunity between the non-legacy terminal and the legacy terminal can be guaranteed.
- FIG. 23 illustrates another embodiment of adjusting a data transmission period of a terminal based on length information of a received WLAN signal.
- the same or corresponding parts as those of the embodiment of FIGS. 21 to 22 described above will be omitted.
- the terminal OT of the OBSS continuously transmits a plurality of data O_DATA-1, O_DATA-2, and O_DATA-3 during the TXOP period OT_TXOP allocated to the corresponding terminal.
- a QoS terminal transmitting video data, voice data, and the like
- a plurality of data including at least one subsequence frame may be continuously transmitted during a TXOP period allocated to the terminal.
- the terminal OR receiving a plurality of data from the terminal OT transmits response messages O_ACK-1, O_ACK-2, and O_ACK-3 corresponding to each received frame. The transmission of the plurality of data and corresponding response messages is completed within the TXOP period OT_TXOP allocated to the terminal OT.
- the terminal MT when the terminal MT transmits data while the terminal OT transmits a plurality of data, the terminal MT extracts and extracts length information from at least one of the plurality of data (O_DATA-1, O_DATA-2, O_DATA-3).
- the data transmission period of the terminal is adjusted based on the length information.
- the terminal MT may extract length information from the data of the terminal OT received in the process of performing the CCA for data transmission of the terminal. If the terminal MT transmits a single data, the data transmission period refers to the duration of the data frame, and if the terminal MT continuously transmits a plurality of data, the data transmission period is the TXOP (Transmission Opportunity) of the terminal. May mean.
- TXOP Transmission Opportunity
- the terminal MT when the terminal MT transmits data during transmission of O_DATA-1, the terminal MT extracts length information LEN (O_DATA-1) from O_DATA-1 and stores the extracted length information LEN (O_DATA-1). Based on the data transmission period of the terminal MT is adjusted.
- the extracted length information LEN (O_DATA-1) includes at least one of LEN-1, LEN-2, and LEN-3 extracted from O_DATA-1.
- LEN-1 may indicate the length of data O_DATA-1 from which the corresponding length information is extracted, and LEN-2 indicates a TXOP interval (OT_TXOP) allocated to the terminal OT transmitting the data O_DATA-1.
- LEN-3 indicates an arbitrary length defined by the MAC.
- the LEN-1 may indicate the length of the TXOP interval (OT_TXOP) allocated to the terminal OT transmitting the corresponding data O_DATA-1.
- O_DATA-1 further includes L-SIG Length Extend (LLE) information indicating this. can do.
- LLE L-SIG Length Extend
- O_DATA-1 additionally includes HEW-SIG Length Extend (HLE) information indicating this. can do.
- the terminal MT adjusts the data transmission period of the terminal MT to end before the data transmission completion time of the terminal OT based on the extracted length information LEN (O_DATA-1).
- the TXOP interval MT_TXOP allocated to the terminal MT that is, (MY_DATA-1 + SIFS + MY_ACK-1) + SIFS + (MY_DATA-2 + SIFS + MY_ACK-2) + SIFS +...
- the length of + SIFS + (MY_DATA-m + SIFS + MY_ACK-m) may be set shorter than the length of the TXOP interval (OT_TXOP) allocated to the terminal OT.
- the length of the TXOP interval MT_TXOP allocated to the terminal MT is OT_TXOP? LEN (O_ACK)? It can be set below SIFS. That is, the total number of lengths of one or a plurality of data transmitted by the corresponding UE is LEN-2 (O_DATA-1)? LEN (O_ACK-n)? LEN (MY_ACK-m)? Adjust to be below SIFS.
- LEN-2 O_DATA-1
- LEN-2 (O_DATA-1) represents the extracted LEN-2 information.
- LEN (O_ACK-n) is the length of the response message for the last transmission data (O_DATA-n) of the terminal OT
- LEN (MY_ACK-m) is the response message for the last transmission data (MY_DATA-m) of the terminal MT Indicates the length of each.
- transmission of one or more data MY_DATA-1 and MY_DATA-2 and corresponding response messages MY_ACK-1 and MY_ACK-2 transmitted by the terminal MT is allocated to the terminal OT. It is completed within the TXOP section OT_TXOP. All terminals including the legacy terminal attempt to access the channel when the channel is idle for the time of AIFS after transmission of the last response message (O_ACK-n) of the terminal OR. Therefore, a fair channel access opportunity between the non-legacy terminal and the legacy terminal can be guaranteed.
- the terminal MT transmits data of the corresponding terminal by using length information LEN-1 or LEN-2 extracted from the L-SIG field or the HEW-SIG field of the received radio signal O_DATA.
- the period can be determined.
- the terminal MT may adjust the data transmission period of the terminal at a fast time before decoding the MAC header of O_DATA.
- HE, HE0, HE1, HE2, HE3, HE A, and HE B each represent a non-legacy terminal
- Leg and Leg X each represent a legacy terminal
- terminals HE1, HE2, HE3, and Leg X are coupled to a first BSS operated by HE A
- terminals HE, HE0, and Leg are coupled to a second BSS operated by HE B.
- the signal of the corresponding data may be detected by the terminals of the adjacent first BSS.
- the non-legacy terminals HE1, HE2, and HE3 of the first BSS perform CCA based on the aforementioned second CCA threshold value (CCA-SD 2)
- the legacy terminal Leg X performs CCA based on the first CCA threshold value (CCA-SD 1).
- the non-legacy terminal HE1 If it is assumed that the data of the terminal HE0 is received to each terminal by the received signal strength between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2), the non-legacy terminal HE1, The HE2 and HE3 can perform the backoff procedure by reducing the backoff counters (backoff 1, backoff 2, and backoff 3) assigned to the corresponding UE, but the legacy UE Leg X cannot perform the channel access without performing the backoff procedure. The problem of inequality that defers arises.
- the non-legacy terminals HE2 and HE3 use the remaining backoff counters remaining in the previous backoff procedure (remaining backoff 2 and remaining backoff 3), respectively. To resume the backoff procedure.
- the legacy terminal Leg X did not reduce the backoff counter during the previous backoff procedure of the non-legacy terminals, the legacy terminal Leg X resumes the backoff procedure using a backoff X previously assigned to the corresponding terminal. Therefore, even in a subsequent contention window period, the legacy terminal may reduce the probability of accessing the channel compared to the non-legacy terminal.
- the channel access between the non-legacy terminal and the legacy terminal by adjusting the back-off counter used in the back-off procedure of the non-legacy terminals in the spatial reuse interval Equity can be maintained.
- the spatial reuse period refers to a period for performing channel access based on the adjusted CCA threshold value when the BSS identifier information of the received radio signal is different from the BSS identifier information of the terminal.
- the non-legacy terminals HE1, HE2, and HE3 of the first BSS perform CCA based on the second CCA threshold value (CCA-SD 2).
- CCA-SD 2 the second CCA threshold value
- the non-legacy terminals perform a backoff procedure using a backoff counter assigned to each terminal.
- the terminal HE1 whose first backoff counter expires during the execution of the backoff procedure transmits data. At this time, the backoff procedure of the remaining terminals HE2 and HE3 is stopped.
- the non-legacy terminal adjusts the backoff counter assigned to the terminal and resumes the backoff procedure using the adjusted backoff counter when the corresponding channel becomes idle again.
- the non-legacy terminal may restore the backoff counter that has been reduced during the backoff procedure in the spatial reuse interval to the value before the backoff procedure.
- the non-legacy terminal may be allocated a new backoff counter when the backoff procedure is interrupted in the spatial reuse period.
- the adjustment of the backoff counter may be performed when the received signal strength of a radio signal having BSS identifier information different from the corresponding UE is between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2). Can be performed.
- the non-legacy terminal may perform channel access using a plurality of backoff counters.
- the non-legacy terminal may be assigned a first backoff counter and a second backoff counter for the backoff procedure.
- the non-legacy terminal performs a backoff procedure using at least one of the first backoff counter and the second backoff counter based on the received signal strength of the received wireless signal.
- the non-legacy terminal consumes a first backoff counter when the received signal strength of a radio signal having BSS identifier information different from the corresponding terminal is lower than a first CCA threshold value (CCA-SD 1).
- CCA-SD first CCA threshold value
- the second backoff counter may be consumed.
- the non-legacy terminal may transmit data when at least one of the first backoff counter and the second backoff counter expires.
- the non-legacy terminal according to the embodiment of FIG. 24 adjusts the backoff counter used for the backoff procedure in a spatial reuse interval or performs the backoff procedure using a plurality of backoff counters, thereby causing the legacy terminal to occur. Minimize possible inequalities.
- 25 illustrates an interference problem that may occur when a CCA threshold adjusted in accordance with an embodiment of the present invention is used for channel access.
- the MT (MYBSS Transmitter) and MR (MYBSS Receiver) represents a transmitting terminal and a receiving terminal of the first BSS (MYBSS), respectively, the OBSS Transmitter (OT) and OR (OBSS Receiver) A transmission terminal and a reception terminal of another second BSS (OBSSS) are shown.
- the terminal OT may transmit data O_DATA to the terminal OR, and the terminal OR may transmit a response message O_ACK to the terminal OT in response to the received data O_DATA.
- the terminal MT of MYBSS which is a BSS different from the OBSS, determines whether to occupy the channel based on the received signal strength of the radio signal O_DATA and the BSS identifier information of the corresponding signal as in the above-described embodiment. That is, when the BSS identifier information of the received radio signal O_DATA is different from the BSS identifier information of the corresponding terminal, the terminal MT performs CCA based on the aforementioned second CCA threshold value (CCA-SD 2). In this case, the second CCA threshold has a higher level than the first CCA threshold used in the legacy terminal.
- CCA-SD 2 second CCA threshold
- the terminal MT determines the channel as idle and performs channel access. That is, the terminal MT performs a backoff procedure and transmits data MY_DATA when the backoff counter of the backoff procedure expires. In addition, the terminal MR receiving the MY_DATA from the terminal MT transmits a response message (MY_ACK) correspondingly.
- MY_ACK response message
- MY_DATA transmitted by the terminal MT may cause interference to the terminal OR of the OBSS.
- TXOP Transmission Opportunity
- A-MPDU Aggregate MPDU
- 26 and 27 illustrate a data transmission method of a non-legacy terminal for minimizing an interference problem between terminals.
- the terminal OT of the OBSS may transmit one or a plurality of data O_DATA-1 and O_DATA-2 to the terminal OR, which is referred to as O_DATA.
- the terminal MT of the MYBSS may transmit one or a plurality of data MY_DATA-1 and MY_DATA-2 to the terminal MR, which is referred to as MY_DATA.
- FIG. 26 illustrates an embodiment for minimizing interference of the terminal MT of the MYBSS to the OBSS terminal OR.
- terminals performing WLAN communication may exchange a request (REQ) message and a response (RSP) message before data transmission.
- the request message / response message may be Request-to-Send (RTS) / Clear-to-Send (CTS), Null Data Packet (NDP) / ACK, or a single MAC Protocol Data Unit (MPDU) / ACK may be indicated.
- RTS Request-to-Send
- CTS Clear-to-Send
- NDP Null Data Packet
- MPDU MAC Protocol Data Unit
- the terminal MT of MYBSS when the terminal MT of MYBSS receives a request message O_REQ having different BSS identifier information and corresponding response message O_RSP from the corresponding terminal, based on the received signal strengths of O_REQ and O_RSP By accessing the channel, that is, whether to transmit the data (MY_DATA) of the terminal can be determined.
- the UE MT determines whether to transmit MY_DATA based on a result of comparing the received signal strengths of O_REQ and O_RSP with the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2). Decide
- the second CCA threshold value (CCA-SD 2) has a higher level than the first CCA threshold value (CCA-SD 1).
- the terminal MT waits for transmission of MY_DATA.
- the terminal MT waits for transmission of MY_DATA.
- the terminal MT may exceptionally transmit data according to other additional information such as the importance of data to be transmitted.
- the terminal MT may access the channel and transmit MY_DATA.
- the received signal strength of O_REQ is between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2), and the received signal strength of O_RSP is the first CCA threshold (CCA-SD). If lower than 1), the terminal MT may access the channel and transmit MY_DATA. Accordingly, the terminal MT, if the received signal strength of O_REQ is lower than the second CCA threshold (CCA-SD 2), if the received signal strength of O_RSP is lower than the first CCA threshold (CCA-SD 1), You can access and transfer MY_DATA. In this case, it is estimated that the influence of interference that MY_DATA transmitted from the terminal MT has on the terminal OR is small.
- the terminal OR can successfully receive data O_DATA-1 and O_DATA-2 transmitted by the terminal OT.
- a section for performing channel access based on the adjusted CCA threshold is referred to as a spatial reuse section in the present invention.
- the terminal MT transmitting data in the spatial reuse interval may immediately transmit data without exchanging a separate request message and response message.
- the terminal MT may continuously measure the received signal strength of the data transmitted by the OBSS terminals in the spatial reuse period, and adjust the channel access in real time based on the measured result.
- the same criteria as O_REQ are applied to the data O_DATA-1 and O_DATA-2 transmitted by the terminal OT of the OBSS, and the same criteria as the O_RSP to the data O_ACK-1 and O_ACK-2 transmitted by the terminal OR. This can be applied.
- the terminal MT determines whether to access the channel based on the received signal strength of the received data. Recrystallize.
- the received signal strength interval is a first interval lower than the first CCA threshold (CCA-SD 1), the first between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2) And a third section greater than the second section, the second CCA threshold value (CCA-SD 2).
- the terminal MT receiving the information may extract the length information from the corresponding message and adjust the data transmission period of the terminal MT based on the length information. In this case, the terminal MT may omit an operation of extracting length information from data O_DATA-1 and O_DATA-2 transmitted by the terminal OT.
- FIG. 27 shows an additional embodiment for minimizing interference on the terminal MR of MYBSS.
- the same or corresponding parts as those of the embodiment of FIG. 26 will be omitted.
- the terminals MT and MR of the MYBSS may receive the same.
- the terminal MT of the MYBSS determines whether to access a channel based on the received signal strengths of O_REQ and O_RSP. According to the embodiment of FIG. 27, when it is determined that the terminal MT accesses the channel, the terminal MT transmits a request message MY_REQ to the receiving terminal MR.
- the MY_REQ is a message indicating that data transmission of the terminal MT is possible, and may be implemented as a Request-to-Send (RTS), a Null Data Packet (NDP), or a single MAC Protocol Data Unit (MPDU).
- RTS Request-to-Send
- NDP Null Data Packet
- MPDU single MAC Protocol Data Unit
- the terminal MR Upon receiving the MY_REQ from the terminal MT, the terminal MR determines whether to receive the data (MY_DATA) of the terminal MT based on the received signal strengths of the O_REQ and O_RSP. In this case, the terminal MR can receive the MY_DATA based on a result of comparing the received signal strengths of the O_REQ and the O_RSP with the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2). Determine.
- the second CCA threshold value (CCA-SD 2) has a higher level than the first CCA threshold value (CCA-SD 1).
- the terminal MR cannot receive MY_DATA. Further, even when the received signal strengths of O_REQ and O_RSP are both between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2), the terminal MR cannot receive MY_DATA. However, in this case, the terminal MR may receive data exceptionally according to other additional information such as the importance of MY_DATA. Meanwhile, when the received signal strengths of O_REQ and O_RSP are both lower than the first CCA threshold value (CCA-SD 1), the terminal MR may receive MY_DATA.
- the received signal strength of O_RSP is between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2), and the received signal strength of O_REQ is the first CCA threshold (CCA-SD). If lower than 1), the terminal MR may receive MY_DATA. Accordingly, when the received signal strength of O_RSP is lower than the second CCA threshold (CCA-SD 2), the terminal MR selects MY_DATA when the received signal strength of O_REQ is lower than the first CCA threshold (CCA-SD 1). Can be received. In this case, it is estimated that the influence of interference that O_DATA transmitted from the terminal OT of the OBSS to the terminal MR is small. Accordingly, the terminal MR may successfully receive the data MY_DATA-1 and MY_DATA-2 transmitted by the terminal MT.
- the terminal MR transmits a response message MY_RSP corresponding to MY_REQ transmitted by the terminal MT based on whether the received MY_DATA can be received.
- the MY_RSP is a message indicating that data of the terminal MT can be received, and may be implemented as a clear-to-send (CTS) or an ACK. If the terminal MR can receive MY_DATA, the terminal MR transmits MY_RSP corresponding to MY_REQ to the terminal MT. When MY_RSP is received from the terminal MR, the terminal MT may start transmitting MY_DATA. However, if the terminal MR cannot receive MY_DATA, the terminal MR does not transmit the MY_RSP.
- the terminal MT cannot transmit MY_DATA.
- MY_RSP is not received from the terminal MR, the terminal MT cannot transmit MY_DATA.
- the terminal MT by allowing the terminals of MYBSS to exchange MY_REQ and MY_RSP in the spatial reuse interval, it may be further determined whether the terminal MR can receive the terminal data MY_DATA without interference.
- FIGS. 28 and 29 illustrate another interference problem that may occur when the adjusted CCA threshold is used for channel access in accordance with an embodiment of the present invention.
- the same or corresponding parts as those of the embodiment of FIG. 25 will be omitted.
- the terminal OT transmits data O_DATA to the terminal OR, and the terminal OR transmits a response message O_ACK to the terminal OT in response to the received data O_DATA.
- the terminal MT of MYBSS which is a BSS different from the OBSS, determines whether to occupy the channel and performs channel access according to the above-described embodiment. That is, the terminal MT performs a backoff procedure and transmits data MY_DATA when the backoff counter of the backoff procedure expires.
- the terminal MR receiving the MY_DATA from the terminal MT transmits a response message (MY_ACK) correspondingly.
- MY_ACK transmitted by the terminal MR may cause interference with the terminals of the OBSS.
- MY_ACK transmitted by the terminal MR may interfere with the terminal OR receiving data O_DATA of the terminal OT.
- MY_ACK transmitted by the terminal MR may also interfere with the terminal OT receiving the response message O_ACK of the terminal OR.
- FIG. 30 shows another embodiment of a data transmission method of a non-legacy terminal for minimizing an interference problem between terminals.
- the same or corresponding parts as those of FIGS. 26 and 27 will be omitted.
- the terminals MT and MR of the MYBSS may receive it.
- the terminal MT of the MYBSS determines whether to access a channel based on the received signal strengths of O_REQ and O_RSP, and transmits data MY_DATA.
- the terminal MR receiving the MY_DATA transmits a response message (MY_ACK) corresponding thereto.
- the terminal MR may determine the transmission time of MY_ACK based on the received signal strengths of O_REQ and O_RSP.
- the terminal MR determines the transmission time of MY_ACK based on a result of comparing the received signal strengths of O_REQ and O_RSP with the above-described first CCA threshold (CCA-SD 1) and second CCA threshold (CCA-SD 2).
- the second CCA threshold value (CCA-SD 2) has a higher level than the first CCA threshold value (CCA-SD 1).
- the received signal strength of O_REQ is between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2), and the received signal strength of O_RSP is the first CCA threshold (CCA-SD 1). Lower than), the terminal MR transmits MY_ACK 841 within the transmission period of the data O_DATA of the terminal OT. In this case, it is estimated that the effect of interference that the MY_ACK 841 transmitted by the terminal MR affects the terminal OR of the OBSS is small. Accordingly, the terminal OR can successfully receive O_DATA transmitted by the terminal OT.
- the received signal strength of O_RSP is between the first CCA threshold (CCA-SD 1) and the second CCA threshold (CCA-SD 2), and the received signal strength of O_REQ is the first CCA threshold (CCA-SD).
- the terminal MR transmits MY_ACK 842 simultaneously with the transmission of the response message (O_ACK) of the terminal OR.
- the influence of the interference that the MY_ACK 842 transmitted by the terminal MR affects the terminal OT of the OBSS is small. Accordingly, the terminal OT can successfully receive the O_ACK transmitted by the terminal OR.
- the terminal MR completes transmission of data (O_DATA) of the terminal OT and transmission of a response message (O_ACK) of the terminal OR. After that, MY_ACK 843 is transmitted.
- the MY_ACK 843 transmitted by the terminal MR is estimated to interfere with the terminal OT and OR of the OBSS. Accordingly, the terminal MR transmits MY_ACK 843 after the data exchange between the terminal OT and the OR is completed, thereby preventing data collisions that may occur in the OBSS terminals.
- the terminal MR may adjust the transmit power of MY_ACK in consideration of the transmit power of the corresponding terminal and the received signal strength of MY_DATA. Through this, the terminal MR may minimize the amount of interference that MY_ACK gives to the terminal OT or the terminal OR.
- 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.
- Embodiments of the present invention described above may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
- a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
- the software code may be stored in memory and driven by the processor.
- the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.
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Abstract
Description
Claims (11)
- 단말의 무선 통신 방법으로서,특정 채널의 무선 신호를 수신하는 단계;상기 수신된 무선 신호의 BSS 식별자 정보를 추출하는 단계;상기 무선 신호의 BSS 식별자 정보가 상기 단말의 BSS 식별자 정보와 상이할 경우, 상기 무선 신호로부터 길이 정보를 추출하는 단계, 상기 길이 정보는 상기 무선 신호의 전송 완료 시점과 관계된 정보를 나타냄; 및상기 추출된 길이 정보에 기초하여 상기 단말의 데이터 전송 기간을 조절하는 단계;를 포함하는 무선 통신 방법.
- 제1 항에 있어서,상기 길이 정보는 상기 무선 신호 프레임의 듀레이션 필드의 정보를 나타내는 무선 통신 방법.
- 제1 항에 있어서,상기 길이 정보는 상기 무선 신호를 전송하는 외부 단말의 TXOP(Transmission Opportunity)를 나타내는 무선 통신 방법.
- 제1 항에 있어서,상기 길이 정보는 상기 무선 신호의 레거시 프리앰블, 논-레거시 프리앰블 및 MAC 헤더 중 적어도 하나로부터 획득되는 정보인 무선 통신 방법.
- 제1 항에 있어서,상기 데이터 전송 기간은 상기 추출된 길이 정보에 따른 상기 무선 신호의 전송 완료 시점보다 먼저 종료되도록 조절되는 무선 통신 방법.
- 제5 항에 있어서,상기 데이터 전송 기간은 상기 무선 신호의 전송 완료 시점보다 SIFS(Short Inter Frame Space)의 시간 및 응답 메시지의 전송에 필요한 시간의 합산 값 이상으로 먼저 종료되도록 조절되는 무선 통신 방법.
- 제1 항에 있어서,상기 데이터 전송 기간은 상기 단말의 TXOP(Transmission Opportunity)를 나타내는 무선 통신 방법.
- 제1 항에 있어서,상기 무선 신호의 신호 세기를 측정하는 단계; 및상기 측정된 신호 세기와 상기 추출된 BSS 식별자 정보에 기초하여 상기 특정 채널의 점유 여부를 판별하는 단계를 더 포함하며,상기 데이터 전송 기간은 상기 특정 채널이 유휴 상태로 판별되어 상기 단말이 상기 특정 채널에 접근을 수행할 경우 조절되는 무선 통신 방법.
- 제8 항에 있어서,상기 판별하는 단계는 상기 특정 채널에 대한 CCA(Clear Channel Assessment)에 기초하여 수행되며, 상기 CCA에 이용되는 CCA 임계값은 상기 무선 신호의 BSS 식별자 정보가 상기 단말의 BSS 식별자 정보와 동일한지 여부에 따라 서로 다른 레벨로 설정되는 무선 통신 방법.
- 제9 항에 있어서,상기 무선 신호의 BSS 식별자 정보가 상기 단말의 BSS 식별자 정보와 동일할 경우 제1 CCA 임계값이 상기 CCA에 이용되며, 상기 무선 신호의 BSS 식별자 정보가 상기 단말의 BSS 식별자 정보와 상이할 경우 상기 제1 CCA 임계값 보다 높은 레벨의 제2 CCA 임계값이 상기 CCA에 이용되는 무선 통신 방법.
- 무선 통신 단말로서,무선 신호를 송수신하는 송수신부; 및상기 단말의 동작을 제어하는 프로세서를 포함하되,상기 단말은 상기 송수신부를 통해 특정 채널의 무선 신호를 수신하고,상기 프로세서는,상기 수신된 무선 신호의 BSS 식별자 정보를 추출하고,상기 무선 신호의 BSS 식별자 정보가 상기 단말의 BSS 식별자 정보와 상이할 경우, 상기 무선 신호로부터 길이 정보를 추출하되, 상기 길이 정보는 상기 무선 신호의 전송 완료 시점과 관계된 정보를 나타내고,상기 추출된 길이 정보에 기초하여 상기 단말의 데이터 전송 기간을 조절하는무선 통신 단말.
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CN202011126727.6A CN112492702B (zh) | 2014-08-18 | 2015-08-13 | 同时数据通信的无线通信方法及使用其的无线通信终端 |
KR1020197025940A KR102082095B1 (ko) | 2014-08-18 | 2015-08-13 | 데이터 동시 통신을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말 |
JP2017510298A JP6368035B2 (ja) | 2014-08-18 | 2015-08-13 | データの同時通信のための無線通信方法及びこれを利用した無線通信端末 |
EP15833905.1A EP3185637A4 (en) | 2014-08-18 | 2015-08-13 | Wireless communication method for simultaneous data communication, and wireless communication terminal using same |
CN201580044265.4A CN106797662B (zh) | 2014-08-18 | 2015-08-13 | 用于同时数据通信的无线通信方法及使用该方法的无线通信终端 |
KR1020197025938A KR102054117B1 (ko) | 2014-08-18 | 2015-08-13 | 데이터 동시 통신을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말 |
KR1020177004200A KR102054053B1 (ko) | 2014-08-18 | 2015-08-13 | 데이터 동시 통신을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말 |
US15/435,261 US9763268B2 (en) | 2014-08-18 | 2017-02-16 | Wireless communication method for simultaneous data communication, and wireless communication terminal using same |
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US15/912,570 US10575332B2 (en) | 2014-08-18 | 2018-03-06 | Wireless communication method for simultaneous data communication, and wireless communication terminal using same |
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KR102627316B1 (ko) | 2018-06-15 | 2024-01-23 | 소니그룹주식회사 | 통신 장치, 및 통신 방법 |
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JP2024024052A (ja) | 2024-02-21 |
JP7416834B2 (ja) | 2024-01-17 |
US9763268B2 (en) | 2017-09-12 |
KR20170035955A (ko) | 2017-03-31 |
CN112492702B (zh) | 2023-10-13 |
JP2022033342A (ja) | 2022-02-28 |
JP2019180087A (ja) | 2019-10-17 |
KR102054053B1 (ko) | 2019-12-09 |
JP7007329B2 (ja) | 2022-01-24 |
US10575332B2 (en) | 2020-02-25 |
JP6368035B2 (ja) | 2018-08-01 |
JP6535403B2 (ja) | 2019-06-26 |
KR20190105666A (ko) | 2019-09-17 |
US9918343B2 (en) | 2018-03-13 |
EP3185637A1 (en) | 2017-06-28 |
JP2017530610A (ja) | 2017-10-12 |
CN106797662A (zh) | 2017-05-31 |
US20170164406A1 (en) | 2017-06-08 |
KR102054117B1 (ko) | 2019-12-09 |
KR20190105667A (ko) | 2019-09-17 |
KR102082095B1 (ko) | 2020-02-27 |
US20180199378A1 (en) | 2018-07-12 |
JP2018186541A (ja) | 2018-11-22 |
CN106797662B (zh) | 2020-11-10 |
CN112492701A (zh) | 2021-03-12 |
US20170367119A1 (en) | 2017-12-21 |
CN112492702A (zh) | 2021-03-12 |
EP3185637A4 (en) | 2018-04-04 |
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