Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
  • H04W16/14—Spectrum sharing arrangements between different networks
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/0001—Arrangements for dividing the transmission path
  • H04L5/0003—Two-dimensional division
  • H04L5/0005—Time-frequency
  • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
  • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0058—Allocation criteria
  • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W28/00—Network traffic management; Network resource management
  • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
  • H04N21/2385—Channel allocation; Bandwidth allocation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation

Definitions

• the present invention relates to a wireless communication system, and more specifically, to a channelization method in a whitespace band and an apparatus for the same.
• TVWS includes VHF (Very High Frequency) bands (54 to 60, 76 to 88 and 174 to 216 MHz) and UHF (Ultra High Frequency) bands (470 to 698 MHz) allocated for TV broadcast and refers to a frequency band permitted for use by an unlicensed device under the condition that communications of licensed devices (devices for TV broadcast, wireless microphones, etc.) operating in the corresponding frequency bands are not hindered.
• VHF Very High Frequency
• UHF Ultra High Frequency bands
• An unlicensed device that wants to use TV whitespace band needs to provide a licensed device protection function. Accordingly, the unlicensed device must check whether a licensed device occupies the corresponding TV band before starting transmission in the TV whitespace band. That is, the unlicensed device is permitted for use in the whitespace band only when the licensed device is not used in the whitespace band. [7] To achieve this, the unlicensed device needs to access a geo-location database
• An object of the present invention is to provide a method for setting a channel for WLAN operation in the whitespace band correctly and efficiently.
• the object of the present invention can be achieved by providing a method for providing whitespace operation information, including: a first station (STA) transmitting a frame including a TV whitespace high throughput (TVHT) operation information field to a second STA.
• the TVHT operation information field may include primary channel number, channel width, channel center frequency segment 0 and channel center frequency segment 1 subfields.
• a channel center frequency of frequency segment 0 or frequency segment 1 may be determined based on a channel start frequency.
• the channel start frequency may be determined as a function of a TV channel index corresponding to the frequency segment 0 or a TV channel index corresponding to the frequency segment 1.
• a method for receiving whitespace operation information including: a second STA receiving a frame including a TVHT operation information field from a first STA.
• the TVHT operation information field may include primary channel number, channel width, channel center frequency segment 0 and channel center frequency segment 1 subfields.
• a channel center frequency of frequency segment 0 or frequency segment 1 may be determined based on a channel start frequency.
• the channel start frequency may be determined as a function of a TV channel index corresponding to the frequency segment 0 or a TV channel index corresponding to the frequency segment 1.
• an STA device receiving whitespace operation information, including: a transceiver; and a processor, wherein the processor is configured to control the STA device to receive a frame including a TVHT operation information field from another STA device using the transceiver.
• the TVHT operation information field may include primary channel number, channel width, channel center frequency segment 0 and channel center frequency segment 1 subfields.
• a channel center frequency of frequency segment 0 or frequency segment 1 may be determined based on a channel start frequency.
• the channel start frequency may be determined as a function of a TV channel index corresponding to the frequency segment 0 or a TV channel index corresponding to the frequency segment 1.
• the TV channel index corresponding to the frequency segment 0 or the T V channel index corresponding to the frequency segment 1 may be the index of a lowest TV channel in the frequency segment 0 or frequency segment 1.
• the channel center frequency segment 0 subfield may be set to a value indicating a lowest TV channel index for a channel including the BCU, two contiguous BCUs or four contiguous BCUs, on which a TVHT basic service set (BSS) operates.
• BSS TVHT basic service set
• the frequency segment 0 may be a frequency segment including a primary channel.
• the channel center frequency segment 1 subfield may be set to a value indicating a lowest TV channel index for a channel including a BCU or two contiguous BCUs of the frequency segment 1 in which a TVHT BSS operates.
• the predetermined correction value may be 0 when a PPDU (Physical layer convergence procedure (PLCP) Protocol Data Unit) is transmitted using a BCU or two non- contiguous BCUs.
• PPDU Physical layer convergence procedure (PLCP) Protocol Data Unit
• the predetermined correction value may be 0.5 ⁇ TVHT W when the PPDU is transmitted using two contiguous BCUs or two non-contiguous frequency segments.
• the predetermined correction value may be 1.5 x TVHT W when the PPDU is transmitted using four contiguous BCUs.
• the TVHT operation information field may have a size of 4 octets.
• Each of the primary channel number, channel width, channel center frequency segment 0 and channel center frequency segment 1 subfields may have a size of 1 octet.
• the present invention can provide a method for setting a channel for WLAN operation in the whitespace band correctly and efficiently.
• FIG. 1 illustrates an exemplary configuration of an IEEE 802.1 1 system to which the present invention is applicable
• FIG. 4 illustrates an exemplary configuration of a WLAN system
• FIG. 5 is a flowchart illustrating an exemplary link setup procedure according to an embodiment of the present invention.
• FIG. 6 illustrates a TVHT channel-list parameter element and a channel bandwidth
• FIG. 9 illustrates TVHT channelization
• FIG 10 illustrates frequency positions of TV channels
• FIG. 1 1 illustrates an operation of an STA according to an embodiment of the present invention.
• FIG. 12 illustrates a configuration of an RF device according to an embodiment of the present invention.
• Embodiments described hereinbelow are combinations of elements and features of the present invention.
• the elements or features may be considered selective unless otherwise mentioned.
• Each element or feature may be practiced without being combined with other elements or features.
• an embodiment of the present invention may be constructed by combining parts of the elements and/or features. Operation orders described in embodiments of the present invention may be rearranged. Some constructions of any one embodiment may be included in another embodiment and may be replaced with corresponding constructions of another embodiment.
• CDMA Code Division Multiple Access
• FDMA Frequency Division Multiple Access
• TDMA Time Division Multiple Access
• OFDMA Orthogonal Frequency Division Multiple Access
• SC- FDMA Single Carrier-Frequency Division Multiple Access
• CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
• TDMA may be implemented as a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
• GSM Global System for Mobile communications
• GPRS General Packet Radio Service
• EDGE Enhanced Data Rates for GSM Evolution
• OFDMA may be implemented as a radio technology such as IEEE 802.1 1 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved-UTRA (E-UTRA) etc.
• IEEE 802.1 1 Wi-Fi
• WiMAX IEEE 802.16
• E-UTRA Evolved-UTRA
• this application focuses on the IEEE 802.1 1 system.
• the technical features of the present invention are not limited thereto.
• FIG. 1 illustrates an exemplary configuration of an IEEE 802.1 1 system to which the present invention is applicable.
• IEEE 802.1 1 can be composed of a plurality of components and provide a
• a most basic BSS in the IEEE 802.1 1 LAN is an independent BSS (1BSS).
• the IBSS can have a minimum configuration including only 2 STAs.
• the IBSS has a simplest form and corresponds to the BSS (BSS l or BSS2) shown in FIG. 1 , in which components other than STA are omitted. This configuration is possible when STAs can directly communicate with each other.
• This type of LAN can be configured as necessary rather than being previously designed and configured and may be called an ad-hoc network.
• FIG. 2 illustrates another exemplary configuration of an IEEE 802.1 1 system to which the present invention is applicable.
• FIG. 2 shows a distribution system (DS), a distribution system medium (DSM) and an access point (AP) in addition to the configuration of FIG. 1.
• DS distribution system
• DSM distribution system medium
• AP access point
• a direct station-to-station distance may be limited by PHY performance. While this distance limit can be sufficient in some cases, communication between stations having a long distance therebetween may be needed in some cases.
• the DS may be configured to support an extended coverage.
• IEEE 802.1 1 logically discriminates a wireless medium (WM) from the DSM.
• the logical media are used for different purposes and used by different components.
• IEEE 802.1 1 does not limit the media as the same medium or different media.
• the fact that plural media are logically different from each other can explain flexibility of IEEE 802.1 1 LAN (DS structure or other network structures). That is, the IEEE 802.1 1 LAN can be implemented in various manners and physical characteristics of implementations can independently specify corresponding LAN structures.
• Data transmitted from one of STAs associated with an AP to an STA address of the AP can be received at an uncontrolled port at all times and processed by an IEEE 802. IX port access entity. Furthermore, the transmitted data (or frame) can be delivered to the DS when a controlled port is authenticated.
• FIG. 3 illustrates another exemplary configuration of an IEEE 802.1 1 system to which the present invention is applicable.
• FIG. 3 shows an extended service set (ESS) for providing an extended coverage in addition to the configuration of FIG. 2.
• ESS extended service set
• a wireless network having an arbitrary size and complexity may be composed of a DS and an ESS.
• This type of network is called an ESS network in IEEE 802.1 1.
• the ESS may correspond to a set of BSSs connected to a DS. However, the ESS does not include the DS.
• the ESS network looks like an IBSS network at a logical link control (LLC) layer. STAs belonging to the ESS can communicate with each other and mobile STAs can move from a BSS to another BSS (in the same ESS) transparently to LCC.
• LLC logical link control
• IEEE 802.1 1 does not define relative physical positions of BSSs in FIG. 3 and the BSSs may be located as follows.
• the BSSs can partially overlap, which is a structure normally used to provide continuous coverage.
• the BSSs may not be physically connected to each other and there is a limit on the logical distance between the BSSs.
• the BSSs may be physically located at the same position in order to provide redundancy.
• one (or more) IBSS or ESS networks may be physically located in the same space as one (or more ESS) network. This may correspond to an ESS network form when an ad-hoc network operates in the location of the ESS network, IEEE 802.1 1 networks, which physically overlap, are configured by different organizations or two or more different access and security policies are needed at the same position.
• FIG. 4 illustrates an exemplary configuration of a WLAN system.
• FIG. 4 shows an example of a BSS based on a structure including a DS.
• BSS1 and BSS2 constitute an ESS.
• STAs are devices operating according to MAC/PHY regulations of IEEE 802, 1 1.
• the STAs include an AP STA and a non-AP STA.
• the non-AP STA corresponds to a device directly handled by a user, such as a laptop computer, a cellular phone, etc.
• STA1 , STA3 and STA4 correspond to the non-AP STA and STA2 and STA5 correspond to the AP STA.
• a whitespace map (WSM).
• the WSM is a map of information on channels available for unlicensed devices in the TVWS based on channel and frequency information obtained by an STA from the GDB.
• the WSM may include information on an available channel list or frequencies that can be used by unlicensed devices. Channels included in the available channel list are channels that are not used by signals (or users) that need to be legally protected and can be used by an unlicensed device when the unlicensed device accesses the GDB.
• the WSM may include information on channels and frequencies which are available from the corresponding time.
• the unlicensed device requests an available channel to the GDB, it is possible to transmit information on available channels and frequencies by signaling channels that cannot be used by the unlicensed device.
• FCC (Federal Communications Commission) TVWS regulations currently define two device types. That is, a personal/portable device with low power and a fixed device with high power, which operates at a fixed position.
• the fixed device may be referred to as a fixed STA and the personal/portable device may be referred to as a P/P STA.
• the fixed STA and P/P STA may correspond to normal STAs (that is, STAs including an AP and a non-AP) in the WLAN system.
• STAs that is, STAs including an AP and a non-AP
• different operation rules may be applied thereto.
• the fixed device transmits/receives signal at a specific position that is not varied.
• the fixed device needs to access the GDB to acquire information on available channels to transmit a signal at the specific position.
• the fixed device may include a positioning device such as a GPS
• an installer can directly input the position of the fixed device to transmit the location information of the fixed device to the GDB.
• the fixed device is operated on the assumption that once the fixed device is installed and the position thereof is input, the position does not change.
• the position of the fixed device is changed, the changed position needs to be registered.
• the fixed device may serve another fixed device of the same type and the P/P device.
• the fixed device receives information on available channels from the GDB, the fixed device needs to transmit information on the device type thereof and receive information on available channels that can be directly used thereby.
• the fixed device needs to additionally acquire information on available channels that can be used by the P/P device from the GDB or a proxy server connected to the GDB. This is because the fixed device and the P/P device use different channel intervals and operate with different maximum allowable transmit powers and different requirements for neighboring channels and thus the respective device types require different available channel lists.
• the fixed device is permitted to transmit a signal at 512 to 608 MHz and 614 to 698 MHz as well as at 54 to 60 MHz, 76 to 88 MHz, 174 to 216 MHz and 470 to 512 MHz, whereas the P/P device is not allowed to transmit a signal in TVWS bands other than 512 to 608 MHz and 614 to 698 MHz.
• the fixed device can transmit a signal with higher power than the P/P device and up to 4 watts is permitted for the fixed device as effective isotropic radiated power (EIRP).
• EIRP effective isotropic radiated power
• the P/P device can transmit/receive signals at a position that is not fixed and the position thereof can be changed.
• the P/P device can be carried by a person and mobility thereof cannot be predicted.
• the available frequency band of the P/P device is 512 to 608 MHz and 614 to 698 MHz and maximum transmit power thereof is l OOmW (EIRP). That is, the allowable transmit power of the P/P device is limited compared to the fixed device. .
• the P/P device can be categorized into a mode II device and a mode I device according to whether or not the P/P device has identification capability, that is, geo-location capability and capability of accessing the GDB through the Internet.
• the mode II device has geo-location capability and GDB access capability and can access the GDB to acquire information about available channels at the location thereof and then operate in the TVWS at the corresponding location.
• the mode II device can acquire the available channel information from the GDB and then initiate communication through a network by transmitting a signal (e.g. enable signal) for instructing communication to be initiated to the mode I device.
• the mode I device need not have the geo-location capability or GDB access capability and operates under the control of the mode II device or a fixed device.
• a P/P device corresponding to the mode II device can provide a service to another P/P device or fixed device.
• the mode II P/P device can acquire available channel information for the fixed device from the GDB and deliver the available channel information to the fixed device.
• the GDB can calculate available channel information at a location requested by an unlicensed device and transmit the information to the unlicensed device in consideration of a channel use schedule and protection contour of an incumbent user such as a DTV or microphone.
• Parameters considered by the GDB when the GDB calculates the available channel information include a device type, operation location, transmit power and spectrum mask.
• whether or not to use a neighboring channel depends on device type. For example, when a DTV receiver is used on channel #30, the fixed device cannot use channels #29 and #31 even if channels #29 and #31 are not occupied but the P/P device can use the two channels. This is because the possibility that the fixed device interferes with a neighboring channel is high since the fixed device has high transmit power.
• the scope of the present invention is not limited thereto. That is, the scope of the present invention includes exemplary embodiments of the present invention, which are applied to operations in all whitespaces controlled by a DB that provides information on available channels at a specific position. For example, it is expected to permit operation of an unlicensed device, controlled by the GDB, in frequency bands that do not currently correspond to the whitespace but are expected to become whitespace and exemplary embodiments of the present invention applied thereto can be included within the scope of the present invention.
• the mode II device/fixed device can transmit a beacon frame to configure a BSS in step S520.
• the beacon frame may include information on the available channel list, etc.
• the beacon frame may be periodically transmitted.
• a mode I device that wants to participate in the BSS can scan the TVWS in step S530. If the mode I device knows the available channel list that can be used at the current location thereof, the mode I device can perform passive or active scanning only on channels belonging to the available channel list. Passive scanning refers to a process through which the mode I device listens for transmission of the beacon frame from the mode II device/fixed device on a scanning channel. Active scanning refers to a process through which the mode I device transmits a probe request frame and receives a probe response frame from the mode II device/fixed device on the scanning channel.
• the mode I device needs to operate under the control of the mode II device/fixed device. Accordingly, the mode I device needs to perform link setup with the mode II device/fixed device.
• the mode I device can perform association after the scanning process in order to participate in the BSS in step S540. To achieve this, the mode I device can transmit an association request frame to the mode II device/fixed device.
• security setup Upon successful association request/response, security setup is performed in step S550.
• security setup can include a private key setup process through 4- way handshaking using an extensible authentication protocol over LAN (EAPOL) frame.
• EAPOL extensible authentication protocol over LAN
• a method for configuring a channel (referred to as a WLAN channel, WLAN operation channel or operation channel to be distinguished from TV channels, hereinafter) for a communication system (e.g. WLAN) operating in the TVWS.
• a TV channel available for a TVWS device may depend on the position of the device. To support operations of the TVWS device even when contiguous TV channels cannot be used at the corresponding frequency, a method for configuring a contiguous or non-contiguous operation channels can be considered.
• WLAN in the TVWS which is called TVHT operation.
• a bandwidth of a basic unit constituting a TVHT operation channel is represented as W MHz.
• the basic unit constituting the TVHT operation channel may be called a basic channel unit (BCU).
• the bandwidth W of the BCU can be defined based on TV channel bandwidth.
• the U.S. and Korea define a TV channel of 6 MHz
• Australia and New Zealand define a TV channel of 7 MHz
• Europe defines a TV channel of 8 MHz.
• the value of W MHz can be defined as one of 6, 7 and 8 MHz according to regulatory domain.
• a primary channel refers to a common operation channel for all STAs belonging to a BSS.
• the primary channel is used for transmission of a data unit (e.g. PLCP protocol data unit (PPDU)) and may be used for transmission of a basic signal such as a beacon. That is, the primary channel corresponds to a basic channel of STA operation.
• a data unit e.g. PLCP protocol data unit (PPDU)
• PPDU PLCP protocol data unit
• a secondary channel is a channel associated with the primary channel and used to support a wide bandwidth and high throughput by being combined with the primary channel.
• the location of a primary channel from 2 W MHz channels constituting a 2W MHz channel needs to be determined.
• the location of the primary channel can indicate whether the primary channel corresponds to a high frequency part or a low frequency part of the 2 W MHz channels.
• the primary channel is defined in the TVWS in which an available TV channel varies with time or STA location.
• the primary channel defined in configuration of a TVWS operation channel according to the present invention can be set in consideration of available TV channels in the TVWS.
• FIG. 6 illustrates a TVHT channel-list parameter element and a channel bandwidth.
• the channel-list parameter element is information on clear channel assessment (CCA) of a STA.
• CCA refers to an operation of checking whether a wireless medium is busy or not.
• the channel-list parameter element can be used when the STA indicates whether a corresponding channel is a primary channel or a secondary channel when performing CCA.
• TVHT_W may correspond to a BCU and TVHT 2W may correspond to 2 contiguous BCUs.
• Configuration information about an operation channel determined based on available TV channels can be provided by an enabling STA to a dependent STA or provided by an AP STA to a non-AP STA.
• the configuration information on the operation channel can include a channel start frequency, channel width, channel center frequency index (center frequency index of a BCU including a primary channel and a center frequency index of a BCU that does not include a primary channel), primary channel position, etc.
• the channel start frequency can be defined by operating class information.
• Information on the channel width e.g. W, 2W, 4W, W+W, 2W+2W, etc.
• the channel center frequency index and the primary channel position can be defined by a physical layer management entity management information base (PLME MIB).
• FIG. 7 illustrates a TVHT operation element format according to the present invention.
• TVHT STAs in a BSS can be controlled by a TVHT operation element.
• the format of the TVHT operation element may include an element ID field, a length field, a TVHT operation information field and a TVHT basic modulation and coding (MCS) set field.
• MCS TVHT basic modulation and coding
• the element ID field of FIG. 7 may have a value corresponding to an ID indicating that a corresponding information element is the TVHT operation element.
• the length field of FIG. 7 may have a value indicating the size of fields following the length field and can be set to 6 octets in the example of FIG. 7.
• the TVHT operation information field of FIG. 7, may include primary channel number, channel width, channel center frequency segment 0 and channel center frequency segment 1 subfields.
• FIG. 8 illustrates a format of the TVHT operation information field.
• the subfields of the TVHT operation information field proposed by the present invention can be defined as shown in Table 1 .
• Channel center This field defines Index indicating the center frequency of a lowest TV frequency a channel center channel with respect to a TVHT_W, TVHT_2W or segment 0 frequency for TVHT 4W channel on which a TVHT BSS operates for a
• TVHT BSSs of TVHT_W, TVHT_2W or TVHT 4W operation channel
• This field defines Index indicating the center frequency of a lowest TV segment 0 channel channel with respect to a TVHT W or TVHT 2W channel center frequency of frequency segment 0 in which a TVHT BSS operates for TVHT BSSs of for a TVHT W+W or TVHT 2W+2W operation channel
• Channel center This field defines Index indicating the center frequency of a lowest TV frequency segment 1 channel channel with respect to a TVHT_W or TVHT 2W channel segment 1 center frequency of frequency segment 1 in which a TVHT BSS operates for TVHT BSSs of for a TVHT W+W or TVHT_2W+2W operation channel
• the value of the channel center frequency segment 0 field corresponds to the center frequency of frequency segment 0 (i .e. frequency segment including a primary channel) in the case of a TVHT 2W+2W operation channel width, and thus an incorrect value corresponding to the sum of the center frequency of frequency segment 0 and the correction value of Equation 4 is represented as the center frequency of the frequency segment.
• the present invention defines the channel center frequency segment (i.e. dotl 1 CurrentChannelFrequencylndexO or dotl I CurrentChannelCenterFrequency Index 1 of Table 4 which will be shown below) as an index indicating the center frequency of the "lowest" TV channel from among TV channels belonging to the WLAN operation channel. Therefore, the center frequency of the WLAN operation channel can be correctly represented according to Equation 4. Detailed description will be given below in relation to Equation 4.
• the TVHT basic MCS set field of FIG. 7 indicates an MCS for the number of spatial streams of TVHT PPDUs supported by all TVHT STAs in the BSS.
• the TVHT basic MCS set field can be defined as an 8-bit bitmap. Every 2 bits of the 8-bit bitmap indicate an MCS supported for Nss (the number of spatial streams, which can be one of 1 to 4).
• the TVHT basic MCS set field may be defined as BO to B7 of a receive (Rx) MCS map subfield (one of subfields of a VHT supported MCS set field). In this case, the TVHT basic MCS set field can be defined as 1 octet (i.e. 8 bits). However, the present invention is not limited thereto and the TVHT basic MCS set field can be defined as 2 octets (i.e. 16 bits) including 8 bits in addition to the 8-bit bitmap.
• An STA that generates a BSS needs to receive and transmit signals according to a MCS value defined in an MCS set (i.e. TVHTBSSBasicMCSSet) basically supported by the TVHT BSS and an MCS set (i.e. TVHTOperationalMCSSet) supported for TVHT operation.
• an MCS set i.e. TVHTBSSBasicMCSSet
• TVHTOperationalMCSSet an MCS set
• a TVHT AP announces channel width capability supported thereby in a supported channel width set subfield of a TVHT capability information field of a TVHT capability element.
• the TVHT AP sets the channel width subfield of the TVHT operation information field of the TVHT operation element such that the channel width subframe indicates a BSS operating channel width.
• the TVHT AP can indicate one of W, 2W, W+W, 4W and 2W+2W as the BSS operating channel width.
• the bandwidth of a PPDU transmitted from the BSS may be a subset of the BSS operating channel width. For example, when the BSS operating bandwidth is 2W, a supported PPDU bandwidth may be W or 2W. When the BSS operating bandwidth is W+W, the supported PPDU bandwidth may be W or W+W. If the BSS operating bandwidth is 4W, the supported PPDU bandwidth may be one of W, 2W and 4W. When the BSS operating bandwidth is 2 W+2W, the supported PPDU bandwidth may be one of W, 2W or 2W+2W.
• the PPDU may include a PLCP preamble field, a PLCP header field and a data field.
• the PLCP preamble field includes a training field.
• the PCLP header field includes a signal (SIG) field.
• the data field includes a PLCP service data unit (PSDU).
• X 20 MHz), 2X, 4X or 8X/4X+4X.
• Table 2 shows the TVHT BSS operating channel width. As shown in Table 2, the type of the transmitted PPDU can be determined depending on the BSS operating channel width and BO and Bl of the TVHT-SIG-A1 field.
• TVHT_MODE_l PPDU corresponds to a TVH l W VHT PP U or a TVHT W NON HT PPDU.
• the TVHT_W NONJ-IT PPDU refers to replicating a non-HT PPDU twice in a BCU (i.e. TVHT_W bandwidth).
• TVHT MODE 2C PPDU corresponds to a TVHT 2W VHT PPDU or a
• TVHT _2W NON HT PPDU refers to replicating a non-HT PPDU four times in two contiguous BCUs (i.e. TVHT 2W bandwidth).
• TVHT MODE 2N PPDU corresponds to a TVHT W+W VHT PPDU or a TVHT_W+W NON HT* PPDU.
• the TVHTJW+W NON HT PPDU refers to replicating a non-HT PPDU four times in two non-contiguous BCUs (i.e. TVHT W+W bandwidth).
• TVHT _MODE_4C PPDU corresponds to a TVHT_4W VHT PPDU or a TVHT_4W NON HT PPDU.
• the TVHT_4W NON HT PPDU refers to replicating a non-HT PPDU eight times in four contiguous BCUs (i.e. TVHT 4W bandwidth).
• the valid range is 1 to 200.
• the valid, range is 1 to 200.
• the channel start frequency ./cH.stan is determined according to a value defined in country information and operating classes (refer to Tables 9 to 12).
• Npw is determined as follows.
• A 1 in case of TVHT JV10DE 1 and TVHTJV10DE 2N (or TVHT_W and TVHT_W+W).
• N PW 2 in case of TVHT MODE 2C and TVHT MODE 4N (or TVHT 2W and TVHT_2W+2W).
• N PW 4 in case of TVHT MODE 4C (or TVHT 4 W).
• the secondary TVHT_W channel is a channel having a
• the primary TVHT_W channel is a channel having a TVHT_W bandwidth with a center frequency of /cH.stan + W x /p 2 w,idx + 0.5 x W.
• /p 2 w,idx is determined according to Equation 2.
• a secondary TVHT_2W channel is a channel having a TVHT 2W bandwidth with a center frequency of /cH.stan + W ⁇
• the secondary TVHT_2W channel is a channel having a TVHT_2W bandwidth with a center frequency of/cn, s tan + W /S 2 W. K ( " 0.5 ⁇ W.
• the secondary TVHTJ2W channel is a channel having a TVHT 2W bandwidth with a center frequency of /cH.stan + W x / 2 sw , idx + 0.5 ⁇ W.
• /sw.idx fc.idxi (refer to Table 5).
• a transmitted signal is described by complex baseband signal notation.
• the transmitted signal is associated with a complex baseband signal according to the relationship defined by Equation 3.
• f can be represented as a function of dotl l CurrentChannelBandwidth.
• Table 6 shows the center frequency of a PPDU transmitted in the frequency segment is eg .
• Table 7 shows a tone scaling factor and guard interval duration with respect to
• values JVfield of various fields are arranged as a function of the number of BCUs (that is, TVHTJVIODE 1 has a BCU, TVHT_MODE_2C and TVHTJVIODE 2N have two BCUs and TVHTJVIODE 4C and TVHT MODE 4N have four BCUs).
• NON_HT_DUP_OFDM-Data denotes a NON-NT PPDU having a format type of NON HT DUP OFDM.
• Table 8 shows transmission modes and y k M
• a TVHT channel can be specified by fields for specifying a TVHT as shown Table 4.
• W or TVHT_W is represented in MHz and can be defined as one of 6, 7 and 8 MHz according to regulatory domain.
• Equation 4 the channel start frequency is determined by a value defined in country information and operating classes (refer to Tables 9 to 12).
• Equation 4 'dotl l CurrentChannelCenterFrequencylndex' corresponds to 'dotl l CurrentChannelCenterFrequencylndexO' or 'dotl lCurrentChannelCenterFrequencylndexl '.
• 'channelCenterFrequencyCorrection' can be defined as 0 for TVHTJVIODE 1 , 0.5 ⁇ TVHT W for TVHT MODE 2C and TVHT MODE 2N and 1.5 x TVHT W for TVHT MODE 4C and TVHT MODE 4N. Otherwise, 'channelCenterFrequencyCorrection' can be defined as 0 for TVHT_MODE_l and TVHT_MODE_2N, 0.5 TVHT W for TVHT_MODE_2C and TVHT MODE 4N and 1.5 x TVHT W for TVHT MODE 4C.
• the channel start frequency is a frequency at which the channel number of the regulatory domain corresponds to a radio local area network (RLAN) channel number. That is, the channel start frequency is defined as the center frequency of the first channel.
• the channel start frequency is the center frequency of a channel corresponding to channel index 0 when the channel index is counted from 0 and corresponds to the center frequency of a channel corresponding to channel index 1 when the channel index is counted from 1 .
• FIG. 9 illustrates TVHT channelization.
• An available channel list in a TVWS band is determined based on TV channel numbers and a WLAN channel (or WLAN operation channel) can be determined in consideration of the available channel list.
• FIG. 9 assumes a case in which TV channel indices 0 to 4 are available in an available channel list and a WLAN channel corresponding to channel indices 2 and 3 is configured. That is, it is assumed that the WLAN channel has a channel width of TVHT_2W and a PPDU is transmitted according to TVHT_MODE_2C operation.
• the channel center frequency is 0.045 GHz, that is, 45 MHz, as described above (refer to Table 9).
• 'dotl l CurrentChannelCenterFrequencylndex'de notes the center frequency of a lowest TV channel of a frequency segment (i.e. a unit composed of two BCUs).
• the index (i.e. TV channel number) of the center frequency of the lowest TV channel from among TV channels included in a frequency segment of the WLAN channel is 2.
• the center frequency of the WLAN channel can be calculated based on Equation 4.
• Channel start frequencies of US TV channels 2 and 3 correspond to 45 MHz (refer to Table 9)
• TVHT W 6MHz
• a WLAN channel is located in the middle of a TVH channel. Accordingly, a single BCU is located in the middle of a single TV channel in the example of FIG. 9.
• the number of subcarriers of a TV channel is 144, the number of subcarriers occupied by a BCU can be 128.
• the center frequency of the primary TVHT W channel can be determined according to Equation 5.
• TVHT 2W channel can be used.
• the center frequencies of these two channels need to be largely separated from each other, compared to TVHT_2W. That is, the difference between
• 'dotl lCurrentChannelCenterFrequencylndexO' and 'dotl l CurrentChannelCenterFrequencylndexl ' needs to correspond to a frequency difference larger than 2.
• dotl l CurrentChannelBandwidth TVHT 2W (12 MHz)
• dotl lCurrentChannelCenterFrequencylndexO 15
• This channel has a bandwidth of 12 MHz, center frequency of 482 MHz and primary 6MHz channel center frequency of 485 MHz (refer to Equations 4 and 5 and Table 9).
• a country element includes information necessary for an STA to set the PHY and MAC thereof such that the PHY and MAC operate when an operating triplet is present.
• the operating triplet can include operating extension identifier, operating class and coverage class fields.
• the operating class is an index indicating a set of values for radio operation in the regulatory domain.
• the following tables (Tables 9 to 12) showing the operating class include information that represents additional operation requirements for behaviors and signal detection limits. That is, the operating class can be composed of a channel start frequency, a channel spacing, a channel set and a behavior limit set.
• the channel start frequency is a variable provided for each channel number and has a frequency value.
• the channel start frequency can be used with a channel number to calculate a channel center frequency.
• the channel spacing refers to a difference between center frequencies of non-overlapping adjacent channels when a maximum bandwidth permitted in the corresponding operating class is used.
• the channel set is a list of legal integer channel numbers in the corresponding regulatory domain and class.
• the behavior limit set refers to behavior limits (refer to Annex D of IEEE 802. 1 1 standard documents) defined in various regulatory domains.
• Tables 9 to 12 show operating classes of U.S., Europe, Japan and a global operating class. Definition of the operating class can be corrected or superseded according to change in regulations of an area or country.
• the channel start frequency of TV channels #2, #3 and #4 is different from the channel start frequency of TV channels #5 and #6 in the case of U.S.
• the channel start frequency of TV channels #5 and #6 is different from the channel start frequency of TV channels #7 to #13 and the channel start frequency of TV channels #7 to #13 is different from the channel start frequency of TV channels #14 to #51 .
• TV channels #4 and #5 are separated from each other in terms of frequency
• TV channels #6 and #7 are separated from each other in terms of frequency
• TV channels #13 and #14 are separated from each other in terms of frequency (the band between TV channels #4 and #5, the band between TV channels #6 and #7 and the band between TV channels #13 and #14 are defined for various other purposes (e.g. an amateur radio band, international FM radio band, marine VHF radio band, etc.)).
• FIG 10 illustrates exemplary frequency positions of TV channels.
• a channel start frequency is given as 0.045 GHz.
• a channel start frequency applied to a TV channel in Table 9 corresponds to the center frequency of the first virtual channel (e.g. virtual TV channel #0 when the TV channel index is counted from 0) in the TV channel.
• the channel start frequency is varied according to 'dotl lCurrentChannelCenterFrequencylndex', as shown in Tables 9 to 12, and the center frequency of a WLAN operation channel is determined based on 'dotl l CurrentChannelCenterFrequency Index' and the channel start frequency, as represented by Equation 4.
• dotl lCurrentChannelBandwidth TVHT_W+W (6+6 MHz)
• dotl l CurrentChannelCenterFrequencylndexO 4
• dotl ICurrentChannelCenterFrequencylndexl 6 in the U.S.

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