WO2011129618A2 - 무선랜 시스템에서 통신 방법 및 장치 - Google Patents
무선랜 시스템에서 통신 방법 및 장치 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/04—Wireless resource allocation
Definitions
- the present invention relates to a WLAN system, and more particularly, to a method for determining a channel and performing communication in a WLAN system and an apparatus for supporting the same.
- Wireless LAN is based on radio frequency technology, using a portable terminal such as a personal digital assistant (PDA), a laptop computer, a portable multimedia player (PMP), or the like. It is a technology that allows wireless access to the Internet in a specific service area.
- PDA personal digital assistant
- PMP portable multimedia player
- IEEE 802.11 improves Quality of Service (QoS), access point protocol compatibility, security enhancement, radio resource measurement, and wireless access vehicular environment. Standards of various technologies such as, fast roaming, mesh network, interworking with external network, and wireless network management are being put into practice.
- IEEE 802.11n In order to overcome the limitation of communication speed, which has been pointed out as a weak point in WLAN, IEEE 802.11n is a relatively recent technical standard. 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 standard not only uses a coding scheme for transmitting multiple duplicate copies to increase data reliability, but may also use orthogonal frequency division multiplex (OFDM) to increase the speed.
- HT High Throughput
- MIMO Multiple Inputs and Multiple Outputs
- OFDM orthogonal frequency division multiplex
- HT High Throughput
- PPDU Physical Layer Convergence Procedure
- PPDU Protocol Data Unit
- STA legacy stations
- An HT green field PPDU format is introduced, which is a PPDU format efficiently designed for HT STAs that can be used in the system.
- the legacy STA and the HT STA support the HT mixed PPDU format, which is a PPDU format designed to support the HT system in a coexisting system.
- Next-generation wireless LAN system that supports Very High Throughput (VHT) is the next version of IEEE 802.11n wireless LAN system, recently to support data processing speed of 1Gbps or more in MAC Service Access Point (SAP) It is one of the newly proposed IEEE 802.11 WLAN system.
- VHT Very High Throughput
- the next generation WLAN system allows a plurality of VHT STAs to access and use the channel at the same time in order to use the wireless channel efficiently. To this end, it supports transmission of MU-MIMO (Multi User-Multiple Input Multiple Output) using multiple antennas.
- a VHT access point (AP) may perform spatial division multiple access (SDMA) transmission for simultaneously transmitting spatial multiplexed data to a plurality of VHT STAs.
- SDMA spatial division multiple access
- a plurality of spatial streams may be distributed to a plurality of STAs to simultaneously transmit data to increase the overall throughput of the WLAN system.
- the IEEE 802.11n standard represented by the existing HT WLAN system supported a transmission channel having a bandwidth of 20 MHz and 40 MHz.
- the next generation wireless LAN system is to support a transmission channel having a bandwidth of 20MHz, 40MHz, 80MHz, continuous 160MHz and discontinuous 160MHz (80 + 80) bandwidth or more.
- feasibility tests are underway for systems using 4x4 MIMO and 80 MHz or higher channel bandwidth to provide throughput above 1 Gbps.
- An object of the present invention is to provide a method of determining a transmission channel for frame transmission and performing communication in a WLAN system.
- a communication method in a WLAN system.
- the communication method may include a first BSS using a first primary channel (P-CH) and a first secondary channel (S-CH) by a first access point (AP); Basic Service Set), the second P-CH, the second S-CH, the second tertiary channel (T-CH) and the second quaternary channel (Q) by the second AP; Setting a second BSS using a channel, wherein a band of the first P-CH and a band of the second P-CH are overlapped with each other; 2 is characterized in that the common channel (common channel) used for the operation of the member station of the BSS.
- Bandwidths of the first P-CH and the first S-CH are the same, and bandwidths of the second P-CH, the second S-CH, the second T-CH, and the second Q-CH are the same. can do.
- bandwidth of claim 2 wherein the bandwidths may be 20 MHz.
- the band of the first S-CH and the band of the second S-CH may overlap.
- the second P-CH and the second S-CH may be contiguous.
- the second T-CH and the second Q-CH may be allocated to a lower band than the second P-CH.
- the second T-CH and the second Q-CH may be allocated to an upper band higher than the second P-CH.
- a Basic Service Area which is an area for providing a service to a member station of the first BSS, and a BSA of the second BSS may overlap partly or entirely.
- a WLAN system in another aspect, includes a first AP and a second P-CH, a second S-CH, a second T-CH, and a second Q that configure a first BSS using a first P-CH and a first S-CH.
- a second AP configured to set a second BSS using -CH, wherein a band of the first P-CH and a band of the second P-CH overlap, and the second P-CH is the second BSS. It is a common channel used for the operation of member stations.
- the band of the first S-CH and the band of the second S-CH may overlap.
- the second P-CH and the second S-CH may be adjacent to each other.
- the second T-CH and the second Q-CH may be allocated to a lower band than the second P-CH.
- the second T-CH and the second Q-CH may be allocated to a higher band than the second P-CH.
- a BSA serving as a service area for a member station of the first BSS and a BSA of the second BSS may overlap partly or entirely.
- a throughput of a WLAN system can be improved by providing a method for efficiently selecting a wideband transmission channel in an OBSS (Overlapping BSS) environment.
- OBSS Overlapping BSS
- data frames may be transmitted by changing transmission channels according to channel conditions, thereby improving throughput of a WLAN system.
- FIG. 1 is a diagram illustrating a physical layer architecture of IEEE 802.11.
- FIG. 2 is a block diagram showing an example of a PPDU format used in the WLAN system of the present invention.
- FIG. 3 is a diagram illustrating an example of a channel that can be used in an HT wireless LAN system supporting a 40 MHz bandwidth.
- FIG. 4 is a diagram illustrating a frame transmission method in a WLAN system supporting a 40 MHz bandwidth.
- FIG. 5 is a diagram illustrating an example of sequence application for PAPR degradation in an HT WLAN system.
- FIG. 6 is a diagram illustrating an example of using a channel of a WLAN system supporting an 80 MHz bandwidth.
- FIG. 7 is a diagram illustrating a wireless LAN environment to which an embodiment of the present invention can be applied.
- FIG. 8 is a diagram illustrating an example of a channel environment to which a channel selection method according to an embodiment of the present invention can be applied.
- FIG. 9 is a diagram illustrating a first example of transport channel selection according to an OBSS channel scanning rule according to an embodiment of the present invention.
- FIG. 10 is a diagram illustrating a second example of channel selection according to an OBSS channel scanning rule according to an embodiment of the present invention.
- FIG. 11 is a diagram illustrating a third example of channel selection according to an OBSS channel scanning rule according to an embodiment of the present invention.
- FIG. 12 is a diagram illustrating a first example of a method for selecting an 80 MHz transmission channel according to an embodiment of the present invention.
- FIG. 13 is a diagram illustrating a second example of an 80 MHz channel selection method according to an embodiment of the present invention.
- FIG. 14 illustrates a third example of an 80 MHz channel selection method according to an embodiment of the present invention.
- FIG. 15 illustrates a channel environment to which an embodiment of the present invention can be applied.
- FIG 16 illustrates an example of transport channel selection according to an embodiment of the present invention.
- FIG 17 illustrates another example of channel selection according to an embodiment of the present invention.
- FIG. 18 is a diagram illustrating a first example of sequence application for PAPR degradation according to an embodiment of the present invention.
- FIG. 19 is a diagram illustrating a second example of sequence application for PAPR degradation according to an embodiment of the present invention.
- FIG. 20 is a diagram illustrating a third example of sequence application for PAPR degradation according to an embodiment of the present invention.
- 21 is a diagram illustrating a data frame transmission method according to an embodiment of the present invention.
- FIG. 22 is a block diagram illustrating a wireless device in which an embodiment of the present invention may be implemented.
- a wireless local area network (WLAN) system in which an embodiment of the present invention is implemented includes at least one basic service set (BSS).
- BSS is a collection of stations (STAs) that have been successfully synchronized to communicate with each other.
- STAs stations
- BSS can be classified into Independent BSS (IBSS) and Infrastructure BSS.
- the BSS includes at least one STA and an Access Point (AP).
- the AP is a functional medium that provides a connection through a wireless medium for each STA in the BSS.
- the AP may be called by other names such as a centralized controller, a base station (BS), a scheduler, and the like.
- a STA is any functional medium that includes a medium access control (MAC) and a wireless-medium physical layer (PHY) interface that meets the IEEE 802.11 standard.
- the STA may be an AP or a non-AP STA, but refers to a non-AP STA unless otherwise indicated below.
- the STA may be classified into Very High Throughput (VHT) -STA, High Throughput (HT) -STA, and L (Legacy) -STA.
- VHT Very High Throughput
- HT High Throughput
- L Legacy
- the HT-STA refers to an STA supporting IEEE 802.11n
- the L-STA refers to a STA supporting a lower version of IEEE 802.11n, for example, IEEE 802.11a / b / g.
- L-STA is also called non-HT STA.
- FIG. 1 is a diagram illustrating a physical layer architecture of IEEE 802.11.
- the PHY architecture of IEEE 802.11 includes a PHY Layer Management Entity (PLME), a Physical Layer Convergence Procedure (PLCP) sublayer 110, and a Physical Medium Dependent (PMD) sublayer 100.
- PLME cooperates with the MAC Layer Management Entity (MLME) to provide the management of the physical layer.
- the PLCP sublayer 110 transfers the MAC Protocol Data Unit (MPDU) received from the MAC sublayer 120 to the sublayer between the MAC sublayer 120 and the PMD sublayer 100 according to an instruction of the MAC layer.
- the frame coming from the PMD sublayer 100 is transferred to the MAC sublayer 120.
- the PMD sublayer 100 is a PLCP lower layer to enable transmission and reception of physical layer entities between two stations through a wireless medium.
- the MPDU delivered by the MAC sublayer 120 is referred to as a physical service data unit (PSDU) in the PLCP sublayer 110.
- PSDU physical service data unit
- the MPDU is similar to the PSDU. However, when an A-MPDU (aggregated MPDU) that aggregates a plurality of MPDUs is delivered, the individual MPDUs and the PSDUs may be different from each other.
- A-MPDU aggregated MPDU
- the PLCP sublayer 110 adds an additional field including information required by the physical layer transceiver in the process of receiving the PSDU from the MAC sublayer 120 and transmitting it to the PMD sublayer 100.
- the added field may be a PLCP preamble, a PLCP header, and tail bits required on the data field.
- the PLCP preamble serves to prepare the receiver for synchronization and antenna diversity before the PSDU is transmitted.
- the PLCP header includes a field including information on the PPDU to be transmitted, which will be described in detail later with reference to FIG. 2.
- the PLCP sublayer 110 adds the above-mentioned fields to the PSDU to generate a PPDU and transmits the PPDU to the receiving station via the PMD sublayer, and the receiving station receives the PPDU to obtain information necessary for data restoration from the PLCP preamble and the PLCP header. Restore
- FIG. 2 is a block diagram showing an example of a PPDU format used in the WLAN system of the present invention.
- the PPDU 200 includes an L-STF 210, an L-LTF 220, an L-SIG field 230, a VHT-SIGA field 240, a VHT-STF 250, and a VHT-. It may include an LTF 260, a VHT-SIGB field 270, and a data field 280.
- the PLCP sublayer adds the necessary information to the PSDU received from the MAC layer and converts the information into a data field 280 and converts the L-STF 210, L-LTF 220, L-SIG field 230, and VHT-SIGA field ( 240, the VHT-STF 250, the VHT-LTF 260, the VHT-SIGB 270, etc. are added to generate the PPDU 700 and transmit the PPDU 700 to one or more STAs through the PMD layer.
- the L-STF 210 is used for frame timing acquisition, automatic gain control (AGC) convergence, coarse frequency acquisition, and the like.
- AGC automatic gain control
- the L-LTF 220 is used for frequency estimation and channel estimation for demodulation of the L-SIG field 230 and the VHT-SIGA field 240.
- the L-SIG field 230 is used by the L-STA to receive the PPDU 200 to obtain data.
- the VHT-SIGA field 240 is common control information required for the STAs paired with the AP and the MIMO, and includes control information for interpreting the received PPDU 200.
- the VHT-SIGA field 240 may include information on spatial streams for each of a plurality of MIMO paired STAs, bandwidth information, identification information on whether or not to use Space Time Block Coding (STBC), and identification of STA groups.
- Information Group Identifier
- information on the STA to which each group identifier is assigned and short GI (Guard Interval) related information.
- the identification information (Group Identifier) for the STA group may include whether the currently used MIMO transmission method is MU-MIMO or SU-MIMO.
- VHT-STF 250 is used to improve the performance of AGC estimation in MIMO transmission.
- VHT-LTF 260 is used by the STA to estimate the MIMO channel. Since the VHT WLAN system supports MU-MIMO, the VHT-LTF 260 may be set as many as the number of spatial streams in which the PPDU 200 is transmitted. Additionally, full channel sounding is supported and the number of VHT LTFs can be greater if this is performed.
- the VHT-SIGB field 270 includes dedicated control information required for a plurality of MIMO paired STAs to receive the PPDU 200 and acquire data. Therefore, the STA may be designed to decode the VHT-SIGB field 270 only when the common control information included in the VHT-SIGB field 270 indicates that the currently received PPDU 200 is MU-MIMO transmitted. Can be. Conversely, the STA may be designed not to decode the VHT-SIGB field 270 when the common control information indicates that the currently received PPDU 200 is for a single STA (including SU-MIMO).
- the VHT-SIGB field 270 includes information on modulation, encoding, and rate-matching of each STA.
- the size of the VHT-SIGB field 270 may vary depending on the type of MIMO transmission (MU-MIMO or SU-MIMO) and the channel bandwidth used for PPDU transmission.
- the data field 280 includes data that the AP and / or STA wish to transmit.
- the data field may include a service field, a PSDU including data, a tail bit, and a padding bit.
- the service field is a field for initializing a scrambler used in generating a PPDU.
- the tail bit may consist of a sequence of bits needed to return the convolutional encoder to zero.
- the tail field may be assigned a bit length proportional to the number of Binary Convolutional Code (BCC) encoders used to encode data to be transmitted.
- BCC Binary Convolutional Code
- the PSDU may be a MAC Protocol Data Unit (MPDU) or an Aggregate MPDU (A-MPDU), which is a data unit delivered from the MAC layer.
- MPDU MAC Protocol Data Unit
- A-MPDU Aggregate MPDU
- the size of the bit sequence constituting the PSDU may be represented by the value of the length subfield included in the VHT-SIG field.
- the padding field indicates the remaining bit space when the last symbol among the plurality of OFDM symbols transmitted with the PPDU is allocated, although the bits configuring the PSDU and the bits configuring the tail field are not satisfied, the bit size to be allocated per OFDM symbol is not satisfied. It consists of bits to fill.
- a channel refers to a unit wireless medium that can be used for frame transmission and / or reception between an AP and / or STA and STA, and has a property allocated to have a constant bandwidth value in a specific frequency band.
- the bandwidth of the channel may be allocated to 20 MHz.
- the transmission channel refers to a wireless medium used by an AP and / or an STA and another STA for transmitting and / or receiving a frame, and the transmission channel may be composed of a set of at least one channel.
- the data frame may be used as a concept including the aforementioned PPDU.
- FIG. 3 is a diagram illustrating an example of a channel that can be used in an HT wireless LAN system supporting a 40 MHz bandwidth.
- the HT WLAN system supports 20MHz and 40MHz as a transmission channel bandwidth that can be used by the AP and / or STA.
- a transmission channel having a 40 MHz bandwidth consists of two channels having a 20 MHz bandwidth. One of the two channels is called a primary channel (P-CH) and the other is called a secondary channel (S-CH).
- the P-CH is a channel used by the STAs that are members included in the Basic Service Set (BSS) established by the AP for its operation.
- the S-CH is a 20 MHz bandwidth channel adjacent to the P-CH used for the purpose of creating a 40 MHz channel.
- the AP provides the STA with information on a transmission channel for frame transmission.
- the information may include information on the bandwidth, P-CH, and S-CH of the available transport channel.
- P-CH and S-CH have the feature that they are adjacent to each other. Therefore, the information about the S-CH may include a value indicating whether it is an upper band or a lower band than the P-CH.
- FIG. 4 is a diagram illustrating a frame transmission method in a WLAN system supporting a 40 MHz bandwidth.
- the AP and / or STA may perform S during a Point Coordinator Function (PCF) Interframe Space (PIFS), which is a minimum frame interval before a counter of a backoff performed to obtain a channel access opportunity expires.
- PCF Point Coordinator Function
- PIFS Interframe Space
- -CH When -CH is idle, data frames can be transmitted using 40 MHz.
- the PLCP header including control information necessary for receiving data frames at the receiving end to obtain data through demodulation and decoding, etc. may be set to be transmitted through a P-CH having a 20 MHz bandwidth.
- the AP may transmit information indicating channel switching to the STA when the channel is not good because the channel is difficult to access due to the occupation of the corresponding channel or the influence of noise and interference on the channel is large.
- the information indicating channel switching includes sub information indicating a P-CH and sub information indicating a position at which an S-CH exists based on the P-CH, and sub information related to a time point at which channel switching is applied. It may include.
- the channel switching information may be included in a channel switch announcement frame, which is a type of action frame, and a beacon frame that the AP periodically transmits to transmit paired STAs with control information necessary for frame transmission.
- a new AP may attempt to construct a new BSS.
- BSS basic service area
- BSS2 indicates a new BSS.
- BSS1 supports 20 MHz.
- the band of the 40 MHz transmission channel is selected so that the S-CH used by the BSS2 itself is not the same band as the P-CH of the BSS1.
- BSS1 supports 20 MHz / 40 MHz.
- the BSS2 should select a channel such that its P-CH does not become the same band as the S-CH of BSS1 and the S-CH is the same as the P-CH of BSS1. Through this, fairness in frame transmission of BSS1 and BSS2 can be guaranteed to some extent.
- repetitive data when repetitive data is transmitted through different frequency blocks, it may be transmitted by multiplying a complex value in order to lower the peak to average power ratio (PAPR).
- PAPR peak to average power ratio
- transmission through a frequency block may be as shown in FIG. 5.
- FIG. 5 is a diagram illustrating an example of sequence application for PAPR degradation in an HT WLAN system.
- PAPR can be lowered by using a length-2 sequence of ⁇ +1, + j ⁇ .
- next generation WLAN system to provide a throughput of 1 Gbps or more, support for 80 MHz, continuous 160 MHz (contiguous 160 MHz), discontinuous 160 MHz (non-contiguous 160 MHz, 80 + 80 MHz), and more, the transmission channel bandwidth. Because of this, it is expected to use four or more adjacent 20MHz channels.
- FIG. 6 is a diagram illustrating an example of using a channel of a WLAN system supporting an 80 MHz bandwidth.
- the first channel CH1, the second channel CH2, the third channel CH3, and the fourth channel CH4 each have a 20 MHz bandwidth and exist in adjacent positions.
- the AP and / or STA may transmit and receive data using a channel having a 20 MHz, 40 MHz, or 80 MHz bandwidth according to the channel usage state.
- the AP may determine a primary channel (P-CH) and select the corresponding P-CH as a transmission channel. As shown in FIG. 6, the AP may select CH2 as the P-CH, and may transmit a 20 MHz data frame to the STA using the CH2. At this time, the AP and / or STA to transmit the data frame checks whether the CH2, which is the P-CH, is idle based on the CSMA / CA mechanism (carrier sense multiple access with collision avoidance mechanism). Perform frame transmission.
- P-CH primary channel
- CA carrier sense multiple access with collision avoidance mechanism
- the AP determines the P-CH as in the case of transmitting the 20MHz data frame described above.
- the P-CH may be determined by any one of CH1, CH2, CH3, and CH4, and may be determined as a channel located in the middle of the entire channel band including CH1 to CH4, rather than the boundary channel (CH1 or CH4) as shown in the figure. have.
- the S-CH may be determined as a channel adjacent to the determined P-CH, that is, CH1 or CH3 in the figure.
- the AP may signal the bandwidth information of the transport channel, information on the P-CH, and information on the S-CH to the STA.
- the information on the S-CH may be information indicating whether the upper band or the lower band based on the P-CH.
- the AP may determine the P-CH and determine one of the channels adjacent to the P-CH as the S-CH.
- the P-CH may be determined by any one of CH1, CH2, CH3, and CH4, and as shown in the figure, the P-CH is located in the middle of the entire channel band including CH1 to CH4, rather than a boundary channel (first channel or fourth channel). Can be determined by the channel.
- the S-CH may be determined as a channel adjacent to the determined P-CH, that is, CH1 or CH3 in the figure.
- T-CH tertiary channel
- Q-CH quaternary channel
- CH2 is determined to be P-CH
- CH1 is determined to be S-CH
- T-CH and Q-CH may be determined to be CH3 and CH4.
- T-CH and Q-CH can be bundled to form a 40 MHz Secondary Channel (40 MHz Secondary Channel; 40 MHz S-CH).
- a 20 MHz P-CH and 20 MHz S-CH are bundled to form a 40 MHz primary channel. (40MHz Primary Channel; 40MHz P-CH).
- the AP confirms that the selected P-CH is dormant based on the CSMA / CA mechanism, and if the remaining three 20 MHz bandwidth channels have been in dormant (eg PIFS) for a certain period of time, then the 80 MHz transmission channel Can be transmitted.
- dormant eg PIFS
- a method of transmitting a data frame is described in more detail below.
- the AP needs to select a transport channel for transmitting and receiving a frame with the combined STA and inform the STA about the information.
- the information on the transport channel may include a bandwidth of the transport channel, information on the P-CH, information on the S-CH, information on the T-CH, and information on the Q-CH.
- the information on the P-CH may be information indicating a channel number corresponding to the P-CH.
- the information on the S-CH may be information indicating a channel number corresponding to the S-CH or information indicating a relative position based on the P-CH.
- the information on the transport channel may include a center frequency (center frequency) of the channel band to which the transport channel is allocated, bandwidth information of the transport channel and information indicating the position of the P-CH of the 20MHz bandwidth.
- the AP decides to use a 20 MHz transmission channel, the AP transmits information indicating the 20 MHz bandwidth information of the transmission channel and information indicating the center frequency to the STA, and the STA knows the frequency band of the transmission channel. Can be.
- the frequency band allocated to the corresponding transmission channel is the frequency band allocated to the P-CH.
- the AP may know the frequency band of the transmission channel when the AP transmits information indicating the bandwidth of the transmission channel to 40MHz and information indicating the center frequency to the STA. The same is true for transport channels with bandwidths of 80 MHz or higher.
- the information of the transmission channel may include bandwidth information of a separate frequency band and information indicating a center frequency.
- the information on the transport channel may be transmitted as part of a VHT operational element.
- the VHT operating element includes information necessary for the operation of an AP and / or STA in a next generation WLAN system. For example, information on a transport channel, whether to use reduced interframe spacing (RIFS), and HT supporting 20/40 MHz transmission It may include information about whether the STA and L (legacy) -STA supporting 20MHz transmission are included in the BSS.
- the VHT operating element is transmitted to the STA through an association response frame, a re-association response frame, a probe response frame, a beacon frame, or the like. It may be transmitted through a separate management / action frame for transmission.
- FIG. 7 is a diagram illustrating a wireless LAN environment to which an embodiment of the present invention can be applied.
- the BSS1 710 configured by the AP1 71, and the AP2 72 tries to establish a new BSS2 720.
- the BSS1 710 and the BSS2 720 constitute an OBSS environment. If the BSS2 720 is based on a next-generation wireless LAN system supporting a transmission channel bandwidth of 80 MHz or more, the OBSS scanning rule supporting a transmission channel bandwidth of 80 MHz or more is taken into consideration when the AP2 72 determines a transmission channel for frame transmission and reception. Should be.
- BSS2 720 which is a new BSS supporting 80MHz data frame transmission
- AP2 72 should consider how it affects the throughput and fairness of the existing BSS1 710.
- the BSS1 710 may support 20 MHz, 20/40 MHz, or 20/40/80 MHz data frame transmission.
- the overlapping relationship between each P-CH, S-CH, T-CH, and Q-CH there is a method for channel selection and management of BSS2 that can support data transmission of up to 80 MHz. Required.
- a method of selecting a channel according to the OBSS scanning rule in the above channel band will be described in detail.
- the AP and / or STA in the next generation WLAN system transmit data through 20, 40, and 80 MHz transmission channels.
- the embodiment presented herein is a WLAN system supporting a transmission channel of 80 MHz or more. Application may also be possible.
- Table 2 below is an example of extending the OBSS scanning rules of the HT WLAN system and applying it to the next generation WLAN system supporting 80 MHz data frame transmission.
- BSS2 in selecting T-CH and Q-CH, BSS2 cannot be selected so that BSS1 overlaps with the selected P-CH.
- the S-CH of the newly constructed BSS2 may be selected to overlap with the T-CH and / or Q-CH of the existing BSS1. Since the P-CH can be freely selected, the degree of freedom of transmission channel selection for 80MHz frame transmission can be increased to support 80MHz frame transmission more efficiently.
- a transmission channel selection method based on the channel scanning rule shown in Table 2 will be described below.
- FIG. 8 is a diagram illustrating an example of a channel environment to which a channel selection method according to an embodiment of the present invention can be applied.
- the entire channel band is composed of CH1 (81), CH2 (82), CH3 (83), CH4 (84), and CH5 (85), each channel having a size of 20 MHz bandwidth.
- P-CH of BSS1 supporting HT WLAN system is selected as CH2 (82)
- S-CH is selected as CH3 (73).
- CH5 (85) it is assumed that radar is detected as channel environment. .
- an AP wishing to build a new BSS2 supporting 80 MHz frame transmission should be able to efficiently select / management a transport channel.
- FIG. 9 is a diagram illustrating a first example of transport channel selection according to an OBSS channel scanning rule according to an embodiment of the present invention.
- the BSS2 may support only 20 MHz frame transmission and / or reception.
- FIG. 10 is a diagram illustrating a second example of channel selection according to an OBSS channel scanning rule according to an embodiment of the present invention.
- the P-CH of BSS2 is selected as CH2 82.
- the S-CH may be selected as CH3 83 selected as the S-CH of BSS1.
- FIG. 10A shows the selection of a transport channel when the P-CH is located in a boundary channel of the entire channel band in selecting a transport channel used in a general BSS.
- the AP cannot select CH1 81 as T-CH and / or Q-CH because CH2 82 selected as P-CH must be located at the boundary of the entire transport channel.
- CH5 85 corresponds to a channel on which radar is sensed, it cannot be selected as a channel, and thus, BSS2 cannot support 80 MHz frame transmission and can support up to 40 MHz frame transmission.
- FIG. 10B shows an example of transmission channel selection when the P-CH is limited to the case where the P-CH can be located in the intermediate channel of the entire channel band.
- CH1 81 and CH4 84 may be selected as T-CH and / or Q-CH.
- BSS2 can support up to 80 MHz frame transmission.
- only maximum 40MHz frame transmission may be supported as shown in the example of FIG.
- the AP constituting the BSS2 can not select the CH3 (83) P-CH. This is because the channel selected as the P-CH of BSS2 and the channel selected as the S-CH of BSS1 cannot overlap each other according to the OBSS channel scanning rule according to Table 2. This is because the channel access of BSS1 and BSS2 may cause a fairness problem.
- FIG. 11 is a diagram illustrating a third example of channel selection according to an OBSS channel scanning rule according to an embodiment of the present invention.
- the S-CH may be selected as CH3 (83).
- the BSS2 can support only a maximum of 40 MHz frame transmission.
- the AP selects a transport channel according to another OBSS scanning rule that the T-CH and / or Q-CH of BSS2 may overlap with the P-CH of BSS1, the maximum transport channel may be selected. This will be described later.
- the channel selection method of the next generation WLAN system supporting 80MHz frame transmission it is important to efficiently support the 80MHz channel bandwidth in consideration of fairness like the HT WLAN system.
- the method of selecting the 80MHz channel of the newly constructed BSS is proposed.
- FIG. 12 is a diagram illustrating a first example of a method for selecting an 80 MHz transmission channel according to an embodiment of the present invention.
- an 80 MHz transmission channel band including CH1, CH2, CH3, and CH4 is used as a unit lower frequency band ( The 80 MHz channel band including UNIT lower frequency band), CH5, CH6, CH7, and CH8 may be referred to as a unit middle frequency band.
- four channels (CH9 to CH12) having a 20MHz bandwidth are continuously provided, and an 80MHz channel band including CH9, CH10, CH11, and CH12 may be referred to as a unit upper frequency band. It is assumed that the unit lower / center frequency band and the unit upper frequency band are non-contiguous.
- 80MHz channel is selected by non-overlapping method, three 80MHz channels can be selected. Among these, 80 MHz channel consisting of four 20 MHz channels of CH1-CH4 is 80 MHz transmission channel 1 (80 MHz Tx CH1), and 80 MHz channel consisting of four 20 MHz channels of CH5-CH8 is 80 MHz Tx CH2 and CH9-CH12 Let 80MHz channel consisting of 20MHz channel be 80MHz Tx CH3.
- the primary channel (P-CH) may be selected as CH1 or CH4, which is a 20 MHz boundary sub-channel of the 80 MHz channel, as shown in FIGs. This is an example of simply extending the method of OBSS channel scanning rule of the HT WLAN system.
- the P-CH may be selected as CH2 or CH4, which is an intermediate 20 MHz channel of the 80 MHz channel, as shown in (c) -1 and 2.
- CH2 is shown in (c) -1
- CH3 is shown in (c) -2. It must be selected as (S-CH) to use 80MHz channel. If the above conditions do not exist, T-CH and Q-CH can be selected even if CH3 is selected as S-CH in (C) -1 and CH2 is selected in (C) -2. It can support frame transmission through.
- the location of the P-CH is any position of the channel constituting the 80MHz transmission channel band, it is possible to efficiently support frame transmission through the 80MHz channel.
- FIG. 13 is a diagram illustrating a second example of an 80 MHz channel selection method according to an embodiment of the present invention.
- the 80 MHz Tx CH 1 including CH1-CH4, the 80 MHz Tx CH2 including CH3-CH6, the 80 MHz including CH5-CH8 and the 80 MHz including CH9-CH12 Tx CH4 is shown. That is, 80 MHz Tx CH2 is a 40 MHz shifted channel based on 80 MHz Tx CH1 and 80 MHz Tx CH3 is a 40 MHz shifted channel based on 80 MHz Tx CH2. According to such a channel selection method, a total of four 80 MHz channels can be selected in a given frequency band. Since 80 MHz Tx CH1, 80 MHz Tx CH3, and 80 MHz Tx CH4 are the same as 80 MHz Tx CH1, 80 MHz Tx CH2, and 80 MHz Tx CH3 of FIG.
- the 80 MHz Tx CH2 may be selected if radar is detected at CH2 and / or CH7.
- the P-CH may be determined as CH3 or CH6, which is a 20 MHz boundary channel of the 80 MHz transmission channel as shown in the sub-figures (b) -1 and 2.
- the P-CH may be selected as CH4 or CH5, which is an intermediate 20 MHz channel of the 80 MHz transmission channel, as shown in FIG.
- CH3 must be selected as S-CH in (c) -1 and CH6 in (c) -2 to form an 80 MHz transmission channel.
- T-CH and Q-CH can be selected even if CH5 is selected as S-CH in (C) -1 and CH4 is selected in (C) -2. It can support frame transmission through.
- the location of the P-CH is any position of the channel constituting the 80MHz transmission channel band, it is possible to efficiently support frame transmission through the 80MHz channel.
- FIG. 14 illustrates a third example of an 80 MHz channel selection method according to an embodiment of the present invention.
- the 80 MHz transmission channel may be selected while shifting by 20 MHz based on the 80 MHz Tx CH1 including CH1 to CH4.
- 80 MHz Tx CH1 to 80 MHz Tx CH6 can be selected, with more 80 MHz channels to choose from than Case.1 and Case.2.
- 80MHz Tx CH1, 80MHz Tx CH3, 80MHz Tx CH5, and 80MHz Tx CH6 may be selected according to the channel selection method described in case.1 and case.2, and thus detailed description thereof is omitted.
- a channel selection method for 80 MHz Tx CH2 will be described in detail with reference to the sub-drawing (b).
- the 80MHz Tx CH4 is similar to the 80MHz channel 2 and the channel selection method is omitted.
- the 80MHz Tx CH2 includes four channels (CH2-CH5) having a 20MHz bandwidth.
- the 80 MHz Tx CH2 may be selected if radar is detected at CH1 and / or CH6.
- 80-MHz channel 2 may select the P-CH and S-CH to correspond to the P-CH constituting the 40MHz of the co-existing HT WLAN system when CH3 and S-CH is selected as CH4.
- the T-CH is selected as CH2 and the Q-CH as CH-5 to select an 80 MHz transmission channel.
- a video streaming service provided with a home entertainment system in a home may be a general usage model.
- Video streams are expected to require APs and / or STAs that support 80 MHz capability since they require high throughput.
- the above-described transmission channel selection method is based on Table 2, which is an extension of the OBSS channel scanning rule, which is the basis for selecting P-CH and S-CH, constituting a 40 MHz transmission channel in an HT WLAN system to 80 MHz transmission channel selection. do.
- the transmission channel selection method for 80MHz frame transmission may be based on other OBSS channel scanning rules, which will be described below using Tables 3 and 4 as examples.
- BSS2 in selecting T-CH and Q-CH, BSS2 cannot be selected so that BSS1 overlaps with the selected P-CH.
- Table 3 is that the S-CH of the newly built BSS2 can not be selected to overlap the T-CH and / or Q-CH of the existing BSS1.
- the OBSS channel scanning rule as shown in Table 2 may select the S-CH more freely than that shown in Table 3. That is, since the degree of freedom of transmission channel selection for 80 MHz frame transmission is higher, 80 MHz frame transmission can be more efficiently supported.
- the channel selection degree of freedom for 80 MHz frame transmission is relatively high.
- the fairness of channel selection of BSS1 and BSS2 can be ensured relatively high.
- Table 4 below shows a method of only channel selection for P-CH and S-CH based on the OBSS channel scanning rule of the HT WLAN system.
- the P-CH of the newly constructed BSS2 may be selected to overlap with the T-CH and / or Q-CH of the existing BSS1.
- the S-CH may also be selected without overlapping with the T-CH and / or Q-CH of BSS1.
- the newly constructed T-CH and / or Q-CH of BSS2 may be selected to overlap with the P-CH and / or S-CH of existing BSS1. Can be. This may be usefully applied in the channel environment as shown in FIG. 15.
- FIG. 15 illustrates a channel environment to which an embodiment of the present invention can be applied.
- BSS1 and BSS2 based on the HT WLAN system are constructed, and BSS1 supports 20/40 MHz transmission by selecting CH1 141 and CH2 142 as transmission channels.
- BSS1 selects CH1 151 as P-CH and CH2 152 as S-CH.
- BSS2 selects CH3 143 and CH4 144 as transmission channels to support 20/40 MHz transmission.
- BSS2 selects third channel 143 as P-CH and fourth channel 144 as S-CH.
- an AP wishing to construct a new BSS3 supporting the 20/40/80 MHz transmission in the channel environment as shown in FIG. 15 may support up to 40 MHz transmission.
- This will be described in detail with reference to FIG. 16.
- FIG 16 illustrates an example of transport channel selection according to an embodiment of the present invention.
- BSS3 when the AP intending to construct BSS3 selects CH3 153 as P-CH and CH4 154 as S-CH, CH1 151 and CH2 152 select T-CH and Q. You cannot select with -CH. This is because the T-CH and / or Q-CH of BSS3 may be selected to overlap with the P-CH and / or S-CH of BSS1. Conversely, when the AP selects CH1 151 as P-CH and CH2 152 as S-CH, it is not possible to select CH3 153 and CH4 154 as T-CH and Q-CH. This is because the T-CH and / or Q-CH of BSS3 may be selected to overlap with the P-CH and / or S-CH of BSS2.
- the newly constructed BSS3 can support 80 MHz frame transmission. This will be described with reference to FIG. 17.
- FIG 17 illustrates another example of channel selection according to an embodiment of the present invention.
- the CH1 151 and / or the CH2 162 may be selected as the T-CH and the AP.
- / Or Q-CH can be selected. This is because an overlap of the P-CH and / or S-CH of BSS2 and the T-CH and / or Q-CH of BSS3 to be newly established is allowed. Accordingly, APs and STAs configuring BSS3 may transmit and / or receive up to 80 MHz frames.
- the AP may select a transport channel having an 80 MHz bandwidth. This is because an overlap of the P-CH and / or S-CH of BSS2 and the T-CH and / or Q-CH of BSS3 to be newly established is allowed.
- APs with 80 MHz capability can operate at their maximum performance even when BSSs supporting multiple 40 MHz frame transmissions form an OBSS environment.
- a length-2 sequence ⁇ +1, -j ⁇ is applied to reduce PAPR when transmitting a 40 MHz data frame through two channels having a 20 MHz bandwidth.
- 80 MHz data frame is transmitted through 4 channels having 20 MHz bandwidth.
- the length-4 sequence for lowering the PAPR is determined by ⁇ a, b, c, d ⁇ or It can be expressed as. Where a, b, c, d are arbitrary complex values, to be.
- the positions of the P-CH and the S-CH in the 80 MHz transmission channel bandwidth may be changed within the 80 MHz bandwidth. Therefore, it is proposed to lower the PAPR by applying a different sequence depending on the position of the P-CH / S-CH.
- a description will be given with reference to FIGS. 18 to 20.
- FIG. 18 is a diagram illustrating a first example of sequence application for PAPR degradation according to an embodiment of the present invention.
- the P-CH and the S-CH are located in the lower 40 MHz band of the total 80 MHz bandwidth.
- the positions of the P-CH and the S-CH may be interchanged within the 40 MHz bandwidth.
- FIG. 19 is a diagram illustrating a second example of sequence application for PAPR degradation according to an embodiment of the present invention.
- the P-CH and the S-CH are located in the middle 40 MHz band of the entire 80 MHz bandwidth.
- the positions of the P-CH and the S-CH may be interchanged within the 40 MHz bandwidth.
- FIG. 20 is a diagram illustrating a third example of sequence application for PAPR degradation according to an embodiment of the present invention.
- the P-CH and the S-CH are located in an upper 40Mhz band of the total 80MHz bandwidth.
- the positions of the P-CH and the S-CH may be interchanged within the 40 MHz bandwidth.
- the sequence is applied differently according to the 80MHz transmission channel selection.
- the above-described sequence may be set to be cyclically shifted according to the position of the P-CH.
- Is , Can be either.
- the AP transmits and / or receives a frame with the STA, it may be necessary to change a transmission channel. This will be described with reference to FIG. 21.
- 21 is a diagram illustrating a data frame transmission method according to an embodiment of the present invention.
- CH1 to CH4 are in a dormant state in the first st period. Accordingly, the AP and / or STA may transmit a data frame through an 80 MHz transmission channel during the first period, and the AP and / or STA may select CH2 as P-CH and CH1 as S-CH in selecting a transmission channel. And CH3 and CH4 were selected as T-CH and Q-CH. If necessary, the T-CH and the Q-CH may be bundled together and may be referred to as a 40 MHz secondary channel (40 MHz S-CH). The AP and / or STA may transmit to the STA and / or the AP that receives the data frame through an 80 MHz transmission channel including CH1 to CH4.
- the AP and / or STA needs to check whether the channel is in the idle state before transmitting the data frame. This may be performed based on Clear Channel Assessment (CCA), which is defined in the IEEE 802.11 standard.
- CCA Clear Channel Assessment
- the AP and / or STA may perform channel sensing and check the channel state through the CCA result.
- Channel sensing performed by the AP and / or STA may be performed in the order of P-CH ⁇ S-CH ⁇ T-CH ⁇ Q-CH. If the T-CH and the Q-CH are bundled together and treated as 40 MHz S-CH, the channel sensing sequence may be P-CH ⁇ S-CH ⁇ 40 MHz S-CH.
- the 40MHz bandwidth channel set configured by the existing P-CH and S-CH may be referred to as a 40MHz P-CH.
- the order of channel sensing may be P-CH ⁇ S-CH ⁇ 40MHz S-CH ⁇ 80MHz S-CH
- the 80 MHz S-CH means a channel set of 80 MHz bandwidth or a channel set of 80 MHz bandwidth adjacent to a conventional channel set of 80 MHz bandwidth.
- the existing 80MHz bandwidth channel set may be referred to as 80MHz P-CH.
- the AP and / or STA may transmit a mask frame having a size of 20 MHz on a 20 MHz P-CH according to a Hybrid Coordination Function (HCF) contention-based channel access (EDCA) rule.
- HCF Hybrid Coordination Function
- EDCA contention-based channel access
- An AP and / or STA that transmits a 40 MHz mask frame by acquiring a transmission opportunity according to EDCA or through a point of view (coordination function) interframe space (PIFS) atmosphere is a P-CH having a size of 20 MHz and an S-CH having a size of 20 MHz.
- Channel sensing through CCA should be performed for.
- APs and / or STAs that transmit a 80 MHz mask frame by acquiring transmission opportunities according to EDCA or through a point (coordination function) interframe space (PIFS) atmosphere are required to transmit 20 MHz P-CH before transmitting the 80 MHz mask frame.
- PIFS coordination function interframe space
- channel sensing through CCA should be performed.
- a transmission opportunity is transmitted according to EDCA or through PIFS (point of coordination function) interframe space (PIFS) to transmit a 160 MHz or 80 MHz + 80 MHz size mask frame.
- the AP and / or STA must perform channel sensing through CCA for all 20 MHz P-CH, 20 MHz S-CH, 40 MHz S-CH, and 80 MHz S-CH.
- the MAC stage implementing the WLAN communication implemented by the AP and / or STA may transmit information on the channel state created based on the CCA result to the PHY stage, which may be defined as a primitive (more specifically, PHY-CCA. Primitives).
- the information about the channel state may be implemented in the form of a channel list information element, and the channel list information element may indicate different meanings according to the channel state.
- the meaning indicated by the channel list information element may be as shown in Table 5 below.
- the primitive may be generated when the channel state changes while channel sensing through CCA is performed, and a data frame transmitted by the AP and / or STA may be set to exist during the transmission period. It may also be possible to create in other situations as needed.
- the channel list information element may be transmitted by the AP and / or STA to the receiving STA and / or the AP.
- the AP and / or STA may transmit a frame having a size of 20 MHz.
- the AP and / or STA may transmit a frame having a size of 20 MHz or a frame having a size of 40 MHz unless the channel list information element indicates a P-CH or a P-CH and an S-CH.
- the AP and / or STA transmits a frame having a size of 20 MHz, 40 MHz, or 80 MHz unless the channel list information element indicates P-CH, P-CH and S-CH, or P-CH, S-CH, and 40 MHz S-CH. Can be.
- a data frame transmitted by an AP and / or STA includes a PLCP header and a data field.
- the PLCP header may include transport channel information, and the transport channel information may include information about transport channel bandwidth, P-CH, S-CH, T-CH, and Q-CH.
- the information on the S-CH may be information indicating whether it is located in an upper channel or a lower channel based on the P-CH. More specifically, the transport channel information may be included in the VHT-SIG field of the PLCP header. If a wireless LAN system supports a wider transmission channel than 80 MHz, for example, a continuous 160 MHz and 80 MHz + 80 MHz transmission channel, the transmission channel information according to the corresponding transmission channel bandwidth may be included.
- the transport channel information may include information about a transport channel bandwidth, a center frequency, and a P-CH.
- the transmission channel bandwidth information may indicate 20 MHz, 40 MHz, and 80 MHz, and in the case of a wireless LAN system supporting more than 160 MHz, it may indicate continuous 160 MHz and discontinuous 160 MHz (80 MHz + 80 MHz).
- the center frequency information may indicate the center frequency of the frequency band constituting the corresponding transmission channel.
- the information indicating the center frequency of the first frequency band and the information indicating the center frequency of the second frequency band may be included.
- a specific method of providing center frequency information may be performed by providing a transmission channel starting frequency of a transmission channel and a center frequency index value of the transmission channel. At this time, the center frequency may be a relationship of the transmission channel start frequency + 5 * center frequency index.
- the information on the P-CH may also indicate the center frequency of the P-CH.
- the transport channel information included in the PLCP header may include at least one of the above two types.
- the PLCP header may transmit the P-CH and the data field may transmit the entire transmission channel.
- a second section (2 nd period) in CH3 and CH4 are CCA (Clear Channel Assessment) results because it is busy state AP is CH3 and CH4 as a transmission channel is not available, the AP and / or STA is using the CH1 and CH2 40MHz Frame transmission can be performed. Therefore, the AP and / or the STA includes the transmission channel information in the PLCP header and transmits the received STA and / or the AP.
- the STA may receive a data frame through a transport channel including CH1 and CH2.
- the AP Since the CCA result for the CH1 selected as the existing S-CH in the third period (3 rd period) is busy, the AP cannot use CH1. According to the existing channel selection method, when the S-CH is not available, the AP and / or STA could use only a transmission channel having a 20 MHz bandwidth. However, if the channel adjacent to the P-CH is in an idle state, a transmission channel having a 40 MHz bandwidth may be used if the adjacent channel in the idle state is an S-CH. Therefore, the AP proposes a method of transmitting information indicating that the channel previously selected by the S-CH is changed to another state of the idle state.
- the AP may be configured to indicate that the information on the S-CH is an upper channel based on the P-CH, and may include it in the PLCP header to transmit to the STA.
- the STA may know that the S-CH is changed to CH3.
- the AP may set transmission channel information indicating a new center frequency with a 40 MHz bandwidth and include it in the PLCP header to transmit to the STA.
- the STA may know that the 40 MHz transmission channel is a frequency band configured by CH2 and CH3 and may receive a data frame through the corresponding transmission channel.
- the STA may receive the corresponding data field.
- the AP can select a transmission channel more efficiently and can improve the throughput of the entire WLAN system.
- the channel change may also be implemented through a data frame transmitted by the STA. If the STA includes the transmission channel information in the PLCP header of the frame transmitted, the above embodiment can be implemented.
- the change of the transmission channel is implemented by including the transmission channel information in the PLCP header of the data frame, but the association response frame and the reassembly response frame transmitted by the AP to the STA. It may be implemented as a method of transmitting transmission channel information by including an association response frame, a probe response frame, a beacon frame, and a specific management / action frame.
- FIG. 22 is a block diagram illustrating a wireless device in which an embodiment of the present invention may be implemented.
- a wireless device 2200 includes a processor 2210, a memory 2220, and a transceiver 2230.
- the transceiver 2230 transmits and / or receives a radio signal, but implements a physical layer of IEEE 802.11.
- the processor 2210 is functionally coupled to the transceiver 2230 to generate the data frame, such as the PPDU format, to select a transport channel and to transmit the data frame over the transport channel, as shown in FIGS. 7-21. It is set to implement the MAC layer and / or the PHY layer implementing the example.
- the processor 2210 and / or transceiver 2230 may include an Application-Specific Integrated Circuit (ASIC), other chipsets, logic circuits, and / or data processing devices.
- ASIC Application-Specific Integrated Circuit
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in the memory 2220 and executed by the processor 2210.
- the memory 2220 may be included in the processor 2210, and may be functionally connected to the processor 2210 by various means that are separately located outside the processor 2210.
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Abstract
Description
Claims (14)
- 무선랜 시스템에서, 통신 방법에 있어서,
제1 액세스 포인트(Access Point; AP)에 의해 제1 프라이머리 채널(Primary Channel, P-CH)과 제1 세컨더리채널(Secondary Channel, S-CH)을 사용하는 제1 BSS(Basic Service Set)를 설정하는 단계;
제2 AP에 의해 제2 P-CH, 제2 S-CH, 제2 터시어리 채널(Tertiary Channel; T-CH) 및 제2 쿼터너리 채널(Quaternary Channel; Q-CH)을 사용하는 제2 BSS를 설정하는 단계를 포함하되,
상기 제1 P-CH의 대역(band)과 상기 제2 P-CH의 대역은 중복되고,
상기 제2 P-CH은 상기 제2 BSS의 멤버 스테이션의 운영에 사용되는 공용 채널(common channel)인 것을 특징으로 하는 통신 방법. - 제 1항에 있어서,
상기 제1 P-CH 및 상기 제1 S-CH의 대역폭은 동일하고, 및,
상기 제2 P-CH, 상기 제2 S-CH, 상기 제2 T-CH 및 상기 제2 Q-CH의 대역폭은 동일한 것을 특징으로 하는 통신 방법. - 제 2항에 있어서, 상기 대역폭들은 20MHz인 것을 특징으로 하는 통신 방법.
- 제 1항에 있어서,
상기 제1 S-CH의 대역과 상기 제2 S-CH의 대역은 중복되는 것을 특징으로 하는 통신 방법. - 제 4항에 있어서,
상기 제2 P-CH 및 상기 제2 S-CH은 인접하는(contiguous) 것을 특징으로 하는 통신 방법. - 제 5항에 있어서,
상기 제2 T-CH 및 상기 제2 Q-CH은 상기 제2 P-CH보다 낮은 대역(lower band)에 할당되는 것을 특징으로 하는 통신 방법. - 제 5항에 있어서,
상기 제2 T-CH 및 상기 제2 Q-CH은 상기 제2 P-CH보다 높은 대역(upper band)에 할당되는 것을 특징으로 하는 통신 방법. - 제 1항에 있어서,
상기 제1 BSS의 멤버 스테이션에 서비스를 제공하는 영역인 BSA(Basic Service Area)와 상기 제2 BSS의 BSA는 일부분 또는 전체가 겹치는 것을 특징으로 하는 통신 방법. - 제1 P-CH과 제1 S-CH을 사용하는 제1 BSS를 설정하는 제1 AP; 및
제2 P-CH, 제2 S-CH, 제2 T-CH 및 제2 Q-CH을 사용하는 제2 BSS를 설정하는 제2 AP;를 포함하되,
상기 제1 P-CH의 대역과 상기 제2 P-CH의 대역은 중복되고,
상기 제2 P-CH은 상기 제2 BSS의 멤버 스테이션의 운영에 사용되는 공용 채널인 것을 특징으로 하는 무선랜 시스템. - 제 9항에 있어서,
상기 제1 S-CH의 대역과 상기 제2 S-CH의 대역은 중복되는 것을 특징으로 하는 무선랜 시스템. - 제 10항에 있어서,
상기 제2 P-CH 및 상기 제2 S-CH은 인접하는 것을 특징으로 하는 무선랜 시스템. - 제 11항에 있어서,
상기 제2 T-CH 및 상기 제2 Q-CH은 상기 제2 P-CH보다 낮은 대역에 할당되는 것을 특징으로 하는 무선랜 시스템 - 제 11항에 있어서,
상기 제2 T-CH 및 상기 제2 Q-CH은 상기 제2 P-CH보다 높은 대역에 할당되는 것을 특징으로 하는 무선랜 시스템. - 제 9에 있어서,
상기 제1 BSS의 멤버 스테이션에 서비스를 제공하는 영역인 BSA와 상기 제2 BSS의 BSA는 일부분 또는 전체가 겹치는 것을 특징으로 하는 무선랜 시스템.
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US14/698,605 US9307538B2 (en) | 2010-04-13 | 2015-04-28 | Method and apparatus for communication in a wireless LAN system |
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US8687583B2 (en) | 2014-04-01 |
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