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WO2015199519A1 - Procédé de communication sans fil permettant l'affectation d'un canal libre dans une large bande, et terminal de communication sans fil utilisant ce procédé - Google Patents

Procédé de communication sans fil permettant l'affectation d'un canal libre dans une large bande, et terminal de communication sans fil utilisant ce procédé Download PDF

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Publication number
WO2015199519A1
WO2015199519A1 PCT/KR2015/006659 KR2015006659W WO2015199519A1 WO 2015199519 A1 WO2015199519 A1 WO 2015199519A1 KR 2015006659 W KR2015006659 W KR 2015006659W WO 2015199519 A1 WO2015199519 A1 WO 2015199519A1
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WO
WIPO (PCT)
Prior art keywords
signal
cca
terminal
channel
legacy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2015/006659
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English (en)
Korean (ko)
Inventor
손주형
곽진삼
고건중
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilus Institute of Standards and Technology Inc
Original Assignee
Wilus Institute of Standards and Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Wilus Institute of Standards and Technology Inc filed Critical Wilus Institute of Standards and Technology Inc
Priority to KR1020217013346A priority Critical patent/KR102417162B1/ko
Priority to KR1020227022404A priority patent/KR102529434B1/ko
Priority to KR1020167035621A priority patent/KR102249762B1/ko
Publication of WO2015199519A1 publication Critical patent/WO2015199519A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0457—Variable allocation of band or rate
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a wireless communication method for allocating a clear channel in a broadband and a wireless communication terminal using the same, and more particularly, to a wireless communication method and a wireless communication terminal for efficiently increasing a channel access probability of a terminal using a wideband channel.
  • WLAN 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 a specific service area based on wireless communication technology at a short range. to be.
  • IEEE 802.11 Since IEEE (Institute of Electrical and Electronics Engineers) 802.11 supports the initial wireless LAN technology using the 2.4GHz frequency, various standards of 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.
  • HT High Throughput
  • 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 provides a wireless communication method and a wireless communication terminal as follows.
  • the present invention provides a wireless communication method of a terminal, comprising: performing a backoff procedure on a primary channel; Performing a clear channel assignment (CCA) for at least one subchannel during the backoff procedure; Adjusting a CCA threshold of the primary channel based on whether the at least one subchannel is idle as a result of performing the CCA; Continuing the backoff procedure for the primary channel using the adjusted CCA threshold; It provides a wireless communication method comprising a.
  • CCA clear channel assignment
  • the adjusting of the CCA threshold may increase the CCA threshold of the primary channel when the at least one subchannel is in an idle state.
  • the adjusted CCA threshold is set to a higher level as the number of idle subchannels that can be combined with the main channel increases.
  • adjusting the CCA threshold may include detecting that a radio signal of a level higher than a preset CCA threshold for the backoff procedure is detected in the primary channel during the backoff procedure. When performed.
  • data is transmitted to a broadband channel in which the main channel and the at least one subchannel in an idle state are combined. It characterized in that it further comprises the step of transmitting.
  • receiving the radio signal of the primary channel during the backoff procedure And acquiring BSS identifier information of the radio signal, wherein the CCA threshold is adjusted based on whether the at least one subchannel is idle and BSS identifier information of the radio signal.
  • the adjusted CCA threshold value when the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal is the adjustment when the BSS identifier information of the radio signal is the same as the BSS identifier information of the terminal. It is characterized in that it is set to a level higher than the CCA threshold.
  • 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 characterized by being 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 of 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 characterized in that the 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 may include determining that the specific channel is in an idle state when the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal.
  • 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. It is characterized in that the extraction.
  • 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 different from the first subcarrier set. It is characterized by.
  • the BSS identifier information of the received radio signal may be 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, Whether or not the wireless signal includes the non-legacy wireless LAN information is characterized.
  • 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. It is characterized by.
  • 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 wireless 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.
  • the BSS identifier information of the radio signal is extracted from the preset bit field.
  • 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 performs a backoff procedure on a primary channel and performs a clear channel assignment (CCA) on at least one subchannel during the execution of the backoff procedure. And, as a result of performing the CCA, adjusts the CCA threshold of the primary channel based on whether the at least one subchannel is idle, and continues the backoff procedure for the primary channel using the adjusted CCA threshold.
  • a wireless communication terminal is provided.
  • the processor increases the CCA threshold of the primary channel.
  • the adjusted CCA threshold is set to a higher level as the number of idle subchannels that can be combined with the main channel increases.
  • the processor may perform the CCA threshold when a radio signal of a level higher than a preset CCA threshold for the backoff procedure is detected in the main channel during the execution of the backoff procedure. It is characterized by adjusting.
  • the processor is further configured to combine the main channel with the at least one subchannel in an idle state when the backoff counter of the backoff procedure for the continued main channel using the adjusted CCA threshold is expired. Characterized in that the data is transmitted to the channel of.
  • the processor when the wireless signal of the primary channel is received during the backoff procedure, acquires BSS identifier information of the wireless signal, and determines whether the at least one subchannel is idle.
  • the CCA threshold is adjusted based on BSS identifier information of a radio signal.
  • the adjusted CCA threshold value when the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal is the adjustment when the BSS identifier information of the radio signal is the same as the BSS identifier information of the terminal. It is characterized in that it is set to a level higher than the CCA threshold.
  • 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. And 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, And determining whether the specific channel is occupied based on 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 characterized by being set to different levels depending on whether or not.
  • 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 wireless LAN information, wherein the measured signal strength is between a first clear channel assessment (CCA) threshold and a second CCA threshold, and the non-legacy wireless LAN information is obtained from the wireless signal.
  • CCA clear channel assessment
  • the wireless communication terminal characterized in that 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 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, extracts BSS configuration information from the wireless signal, and measures the measured signal
  • a wireless communication device for determining whether to occupy the particular channel based on the strength and the BSS configuration information of the wireless signal.
  • 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 legacy 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 the problem of inequality. 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.
  • 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.
  • 19 is a diagram illustrating a broadband allocation method for WLAN communication.
  • FIG. 20 illustrates an embodiment of a broadband access method of a terminal.
  • 21 is a view showing another embodiment of a broadband access method of a terminal.
  • FIG. 22 illustrates a CCA threshold selection procedure according to an embodiment of the present invention.
  • 23 and 24 illustrate a broadband communication method based on CCA threshold adjustment.
  • 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 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 a content 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, some components of the station 100, for example, a control unit for individually controlling the transceiver unit 120 and the like. You can also point it.
  • the processor 110 controls various operations of radio signal transmission and reception of the station 100 according to an embodiment of the present invention. Specific embodiments thereof will be described later.
  • the station 100 shown in FIG. 3 is a block diagram according to an embodiment of the present invention, in which blocks shown separately represent logically distinguishing elements of a device. Therefore, the elements of the above-described device may be mounted in one chip or in a plurality of chips according to the design of the device. For example, the processor 110 and the transceiver 120 may be integrated into one chip or implemented as a separate chip. In addition, in the embodiment of the present invention, some components of the station 100, such as the user interface unit 140 and the display unit 150, may be selectively provided in the station 100.
  • FIG. 4 is a block diagram showing the configuration of an AP 200 according to an embodiment of the present invention.
  • the AP 200 may include a processor 210, a transceiver 220, and a memory 260.
  • a processor 210 may include a central processing unit (CPU) 210, a graphics processing unit (GPU), and a central processing unit (GPU) 210.
  • a transceiver 220 may include a central processing unit (GPU) 210, and a central processing unit (GPU) 210.
  • a memory 260 may include a processor 210, a transceiver 220, and a memory 260.
  • FIG. 4 overlapping descriptions of parts identical or corresponding to those of the station 100 of FIG. 3 will be omitted.
  • the AP 200 includes a transceiver 220 for operating a BSS in at least one frequency band.
  • the transceiver 220 of the AP 200 may also include a plurality of transceiver modules using different frequency bands. That is, the AP 200 according to the embodiment of the present invention may be provided with two or more transmit / receive modules of different frequency bands, such as 2.4 GHz, 5 GHz, and 60 GHz.
  • the AP 200 may include a transmission / reception module using a frequency band of 6 GHz or more and a transmission / reception module using a frequency band of 6 GHz or less.
  • Each transmit / receive module may perform wireless communication with a station according to a wireless LAN standard of a frequency band supported by the corresponding transmit / receive module.
  • the transceiver 220 may operate only one transceiver module at a time or simultaneously operate multiple transceiver modules according to the performance and requirements of the AP 200.
  • the memory 260 stores a control program used in the AP 200 and various data according thereto.
  • a control program may include an access program for managing a connection of a station.
  • the processor 210 may control each unit of the AP 200 and may control data transmission and reception between the units.
  • the processor 210 may execute a program for accessing a station stored in the memory 260 and transmit a communication setting message for one or more stations.
  • the communication setting message may include information on the access priority condition of each station.
  • the processor 210 performs connection establishment according to a connection request of a station.
  • the processor 210 controls various operations of wireless signal transmission and reception of the AP 200 according to an embodiment of the present invention. Specific embodiments thereof will be described later.
  • 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 where the preamble is not normally detected, 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 signal strength higher 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 eg, , 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. In the embodiments of FIGS. 11 to 13, the same or corresponding parts as those of the above-described embodiment will be omitted.
  • 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 obtained from the terminal. 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 threshold may be used for the CCA of the corresponding channel.
  • a second CCA threshold level higher than the first CCA threshold value is assigned to the CCA of the corresponding channel. Can be used.
  • 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 includes a legacy preamble 710 and a non-legacy terminal (such as an 802.11ax terminal) for a legacy terminal (such as a terminal such as 802.11a / g).
  • the legacy preamble 710 may include legacy WLAN information decodable by the legacy terminal, such as L-STF, L-LTF, and 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 named 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.
  • This basic configuration of subcarriers is necessary to maintain compatibility with legacy wireless LAN systems (such as 802.11 a / g) and non-legacy wireless LAN systems (such as 802.11 ax). Do. 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 of the legacy preamble, for example, a rate bit field. .
  • 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 additionally configured to include the 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.
  • BSS identifier information may be extracted from a part.
  • the legacy preamble further includes a second subcarrier set
  • 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.
  • the CCA threshold of the primary channel may be determined based on the CCA result of the subchannels.
  • FIG. 19 illustrates a wide bandwidth allocation method for wireless LAN communication.
  • each of CH1 to CH8 represents channels of 20 MHz units, but the number and bandwidth of channels may be changed according to a communication scheme to which the present invention is applied.
  • terminals of each BSS perform communication by setting a specific channel as a primary channel.
  • the primary channel is a channel used by non-AP STAs to associate with an AP and may be extended from a basic 20 MHz to 40 MHz, 80 MHz, etc. according to a transmission bandwidth.
  • the secondary channel is an adjacent channel having the same bandwidth as the primary channel and forms a channel having twice the bandwidth associated with the primary channel.
  • Terminals of the BSS perform a Clear Channel Assessment (CCA) for each channel to check whether the corresponding channel is busy, and perform bandwidth extension based on the channel determined to be idle. That is, the terminal may extend the transmission bandwidth to 40 MHz, 80 MHz, and 160 MHz according to whether the channels adjacent to the main channel are idle with 20 MHz as the default bandwidth.
  • CCA Clear Channel Assessment
  • a total of 40 MHz transmission bandwidths using CH1 and CH2 as main and subchannels may be used. have.
  • a total transmission bandwidth of 80 MHz using CH1 to CH2 as the 40 MHz main channel and CH3 to CH4 as the 40 MHz subchannel may be used.
  • a total transmission bandwidth of 160 MHz using CH1 to CH4 as the 80 MHz main channel and CH5 to CH8 as the 80 MHz subchannel may be used.
  • the corresponding BSS has a maximum bandwidth set to 80 MHz.
  • the backoff procedure and enhanced distributed coordination access (EDCA) are performed only on the 20 MHz main channel CH1, and on the other subchannels CH2 to CH4 through CCA during the PIFS time before the backoff counter expires. It may be checked whether the corresponding channel is available.
  • EDCA enhanced distributed coordination access
  • FIG. 20A illustrates an embodiment in which data (80 MHz PPDU) is successfully transmitted using the set maximum bandwidth.
  • the terminal performs a backoff procedure for the main channel CH1 using the backoff counter assigned to the terminal.
  • the UE performs CCA on the primary channel CH1 to reduce the backoff counter when the channel is idle.
  • a signal detection based CCA CCA-SD
  • the terminal may transmit data through the corresponding main channel CH1.
  • the UE checks whether each channel is available by performing CCA on the other subchannels CH2 to CH4 during the PIFS time before the backoff counter expires.
  • CCA-CD correlation detection based CCA
  • the UE transmits data to a wideband channel including the primary channel CH1 and the subchannels CH2 to CH4. (80MHz PPDU) can be transmitted.
  • FIG. 20B illustrates a broadband access method according to dynamic bandwidth operation.
  • the UE transmits data (40 MHz PPDU) using only the 40 MHz main channels CH1 and CH2. do. That is, according to the embodiment of FIG. 20 (b), when the primary channel and all subchannels are idle, the terminal performs data transmission using the maximum bandwidth, and at least some subchannels are occupied in the CCA process. In the busy state, data transmission is performed using only a part of bandwidth including the main channel.
  • This channel access method may be used in a terminal having a dynamic allocation function capable of quickly reconfiguring a PPCP (PLCP Protocol Data Unit) according to the available channel bandwidth.
  • PPCP PLCP Protocol Data Unit
  • FIG. 20C shows a broadband access method according to a static bandwidth operation.
  • the UE when it is determined that at least some channels are occupied in the CCA process, the UE does not transmit data and performs a backoff procedure until all of the maximum bandwidth (80MHz) is available. Wait. That is, according to the embodiment of Figure 20 (c), if at least one channel of the maximum bandwidth of the entire channel is occupied during the CCA process (busy), the terminal does not use the full bandwidth, for the data transmission for the primary channel Perform the back off procedure again.
  • This channel access method may be used in a terminal that does not have the dynamic allocation function.
  • FIG. 21 illustrates a broadband access method of a terminal using a request to send (RTS) frame and a clear to send (CTS) frame. Also in the embodiment of FIG. 21, the maximum bandwidth of the corresponding BSS is set to 80 MHz, and descriptions overlapping with the embodiment of FIG. 20 will be omitted.
  • the terminal performs a backoff procedure for the primary channel CH1, and when the backoff counter expires, the UE performs an RTS frame with channels CH1 to CH4 having 80 MHz bandwidth including the primary channel and the subchannel. send.
  • FIG. 21A illustrates a broadband access method according to dynamic bandwidth operation.
  • the UE transmits an RTS frame for each channel CH1 to CH4 having an 80 MHz bandwidth, but since the 40 MHz subchannels CH3 and CH4 are occupied, the CTS frame is only available in CH1 and CH2. Received. Accordingly, the terminal transmits data using some bandwidths of 40 MHz in which the CTS frames are received, that is, CH1 and CH2, respectively, as the main channel and the subchannel. Meanwhile, the UE may not use CH3 and CH4 for which the CTS frame has not been received until the next backoff procedure for the main channel CH1 is performed.
  • FIG. 21B illustrates a broadband access method according to the static bandwidth operation.
  • the UE transmits an RTS frame for each channel CH1 to CH4 having an 80 MHz bandwidth, but since some channels CH3 and CH4 are occupied, the CTS frame is not received. Accordingly, the UE postpones the use of all channels CH1 to CH4 of the 80 MHz bandwidth and transmits RTS frames for four channels again after the next backoff procedure.
  • FIG. 22 illustrates a CCA threshold selection procedure according to an embodiment of the present invention.
  • efficient broadband communication can be performed by adjusting the CCA threshold in consideration of the channel allocation width for data transmission of the terminal.
  • the CCA threshold value in the primary channel may be determined through a CCA threshold selection procedure (CSP).
  • the CCA threshold for the backoff procedure of the primary channel may be adjusted based on whether the subchannel is available.
  • the UE performs CCA on subchannels that can be combined with a main channel, and determines whether each subchannel is available (ie, idle state).
  • the UE acquires bandwidth information of available subchannels, such as whether 20 MHz subchannel is available, 40 MHz subchannel is available, 80 MHz subchannel is available, and increases the CCA threshold of the primary channel based on the obtained information. Can be.
  • the default CCA threshold for the 20 MHz main channel backoff procedure is called CCA_low
  • the CCA threshold may be set to a level higher than CCA_low.
  • the CCA threshold of the primary channel is set to CCA_high1 higher than CCA_low. If a 40 MHz channel is also available with the 20 MHz subchannel, the CCA threshold can be set to CCA_high2 higher than CCA_high1. have.
  • the CCA threshold of the main channel may be set to CCA_high3 higher than CCA_high2. That is, the adjusted CCA threshold may be set to a higher level as the number of idle subchannels that can be combined with the main channel increases.
  • the CCA threshold value for the backoff procedure of the primary channel may be adjusted using both availability information of the subchannel and BSS identifier information. More specifically, when the radio signal (interference signal) of the primary channel is received during the backoff procedure, the terminal acquires BSS identifier information of the radio signal. The terminal adjusts the CCA threshold based on whether the BSS identifier information of the corresponding radio signal is the same as the identifier information of the corresponding terminal. That is, the adjusted CCA threshold when the BSS identifier information of the radio signal is different from the BSS identifier information of the terminal is higher than the adjusted CCA threshold when the BSS identifier information of the radio signal is the same as the BSS identifier information of the terminal.
  • the BSS identifier information of the terminal may indicate the BSS identifier assigned to the terminal or the abbreviated information of the corresponding BSS identifier.
  • the BSS identifier information of the radio signal may indicate the BSS identifier of the radio terminal transmitting the radio signal or its shortened information. Accordingly, the terminal may set a higher CCA threshold as the number of idle subchannels that can be combined with the main channel, and as the BSS identifier information of the received interference signal is different from the BSS identifier information of the corresponding terminal.
  • the terminal continues the backoff procedure for the primary channel using the adjusted CCA threshold. That is, the terminal continues the backoff procedure by using the backoff counter before adjusting the CCA threshold.
  • the backoff procedure may continue even if an interference signal higher than the CCA threshold CCA_low set for the backoff procedure of the primary channel is received.
  • the number and differential methods of the adjusted CCA thresholds used in the CCA threshold selection procedure of the present invention are not limited to those illustrated in FIG. 22 and may be set differently according to embodiments. That is, in the embodiment of the present invention, the adjusted CCA threshold used in the CCA threshold selection procedure may include at least one CCA threshold having a level different from the CCA threshold (CCA_low) preset for the main channel backoff procedure. Include.
  • FIG. 23 and 24 illustrate a specific embodiment of the broadband communication method based on the CCA threshold adjustment according to the embodiment of FIG. 22.
  • FIG. 23 illustrates an embodiment when an interference signal is detected in a primary channel
  • FIG. 24 illustrates an embodiment when an interference signal is detected in a subchannel.
  • the CCA threshold selection procedure is a wireless signal of a level higher than the CCA threshold (CCA_low) preset for the backoff procedure during the execution of the backoff procedure, the main channel (CH1) Can be performed when detected by After the radio signal is detected in the main channel CH1, the terminal collects information necessary for adjusting the CCA threshold for a predetermined time (CSP period) and adjusts the CCA threshold based on the collected information.
  • the terminal adjusts the CCA threshold based on the level of the radio signal detected in the primary channel CH1, the BSS identifier information of the radio signal, and the presence or absence of an interference signal in the subchannels CH2 to CH4. If the level of the radio signal detected in the primary channel CH1 is higher than the adjusted CCA threshold, the terminal stops the backoff procedure. However, if the level of the radio signal detected on the main channel CH1 is lower than the adjusted CCA threshold, the terminal continues the backoff procedure.
  • the UE performs a backoff procedure on the primary channel CH1 and other subchannels CH2 to CH4 during the time of PIFS before the backoff counter of the backoff procedure expires.
  • CCA is performed to determine whether each channel is idle.
  • the terminal performs the aforementioned CCA threshold selection procedure (CSP).
  • CSP CCA threshold selection procedure
  • the CCA threshold selection procedure CSP is terminated simultaneously with or before the CCA procedure for the PIFS time for the subchannels CH2 to CH4. Therefore, when the backoff counter of the backoff procedure expires, the terminal transmits data (80MHz PPDU) to a broadband channel in which the primary channel CH1 and the idle subchannels CH2 to CH4 are combined.
  • the CCA threshold selection procedure CSP is applied to the subchannels CH2 to CH4. It may continue after the CCA procedure for the PIFS time for the end of the process. According to an embodiment of the present invention, if the CCA threshold selection procedure continues even after the designated CCA period PIFS for the subchannels CH2 to CH4 ends, the CCA period for the subchannels CH2 to CH4. Can be extended to continuously detect whether each channel is available. In this case, the CCA period for the subchannels CH2 to CH4 may be extended to the end time of the CCA threshold selection procedure.
  • the CCA threshold selection procedure CSP may be started before the CCA procedure for the subchannels CH2 to CH4 is started. That is, even before the designated CCA procedure for the subchannels CH2 to CH4 is started, the CSP may be performed when an interference signal of the main channel CH1 is detected.
  • the CCA procedure of the subchannels CH2 to CH4 may be triggered. That is, even before the designated CCA procedure (the CCA during the PIFS time before the backoff counter expires) of the subchannels CH2 to CH4 is performed, the CCA of the subchannels CH2 to CH4 may be performed together with the CSP. . If the CSP ends, the terminal may immediately perform data transmission even before the backoff counter expires.
  • the terminal may extend the CCA threshold selection procedure (CSP) until the backoff counter of the corresponding terminal expires.
  • CSP CCA threshold selection procedure
  • the CCA procedure of the subchannels CH2 to CH4 may be initiated by the CSP, but may extend beyond the time of the PIFS to terminate with the CSP to continue detecting whether each subchannel is available. have.
  • the UE adjusts the CCA threshold based on the idle subchannel, and returns to the adjusted CCA threshold. Proceed with the off procedure.
  • the number of idle subchannels may be considered. That is, as the number of idle subchannels increases, the adjusted CCA threshold may be set to a higher level.
  • the terminal adjusts the CCA threshold in consideration of the idle 20MHz subchannel (CH2), and continues the backoff procedure with the adjusted CCA threshold.
  • the terminal transmits data (40 MHz PPDU) to a broadband channel in which the primary channel CH1 and the idle subchannel CH2 are combined.
  • the terminal adjusts the CCA threshold in consideration of the idle 40MHz subchannels CH3 and CH4 and continues the backoff procedure with the adjusted CCA threshold.
  • the adjusted CCA threshold when the 40 MHz subchannel is idle may be set to a level higher than the adjusted CCA threshold when the 20 MHz subchannel is idle.
  • the terminal transmits data (20 MHz PPDU and 40 MHz PPDU) by using the primary channel CH1 and the idle subchannels CH3 and CH4 together.
  • 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, procedure, or 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

La présente invention concerne un procédé de communication sans fil permettant l'affectation d'un canal libre dans une large bande, un terminal de communication sans fil utilisant ce procédé, et, plus particulièrement, un procédé de communication sans fil et un terminal de communication sans fil servant à augmenter efficacement la probabilité d'une approche par canal d'un terminal utilisant un canal à large bande. À cet effet, l'invention a trait à un procédé de communication sans fil d'un terminal et à un terminal de communication sans fil utilisant ce procédé, ledit procédé de communication sans fil comprenant : l'exécution d'une procédure de réduction de puissance pour un canal principal ; l'exécution d'une affectation de canal libre (CCA) pour au moins un sous-canal pendant l'exécution de la procédure de réduction de puissance ; l'ajustement, suite à la réalisation de la CCA, d'une valeur de seuil de CCA du canal principal en fonction de l'état dudit sous-canal, qui peut être ou non au repos ; et la poursuite de la procédure de réduction de puissance pour le canal principal, au moyen de la valeur de seuil de CCA ajustée.
PCT/KR2015/006659 2014-06-27 2015-06-29 Procédé de communication sans fil permettant l'affectation d'un canal libre dans une large bande, et terminal de communication sans fil utilisant ce procédé Ceased WO2015199519A1 (fr)

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KR1020217013346A KR102417162B1 (ko) 2014-06-27 2015-06-29 광대역에서의 클리어 채널 할당을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말
KR1020227022404A KR102529434B1 (ko) 2014-06-27 2015-06-29 광대역에서의 클리어 채널 할당을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말
KR1020167035621A KR102249762B1 (ko) 2014-06-27 2015-06-29 광대역에서의 클리어 채널 할당을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말

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