WO2014065611A1

WO2014065611A1 - Method and device for allocating resource in wireless lan system, communication terminal method and communication terminal

Info

Publication number: WO2014065611A1
Application number: PCT/KR2013/009530
Authority: WO
Inventors: 정민호; 권형진; 이재승; 박재우; 이석규
Original assignee: 한국전자통신연구원
Priority date: 2012-10-24
Filing date: 2013-10-24
Publication date: 2014-05-01

Abstract

A method and device for allocating a resource in a wireless LAN system is disclosed. A method of allocating a resource according to an embodiment may include: determining a restricted access bandwidth (RAB) section based on at least one of a plurality of bandwidths or a partial bandwidth thereof; and setting a restricted access window (RAW) in a time domain based on the RAB section.

Description

Resource allocation method and apparatus, communication method and communication terminal in WLAN system

The following description relates to a WLAN system and a method and apparatus for allocating resources in a WLAN system.

The evolution of WLAN technology is proceeding in three directions.

The first direction is a technology to further increase the transmission speed, there is a WLAN technology using a 60GHz band and a WLAN technology using a 5GHz band. The second technology is a wide area WLAN technology that utilizes a frequency band of less than 1 GHz to increase coverage than the existing WLAN technology. The third direction is a technique for reducing the link setup time of the WLAN system.

The wide area WLAN technology should be able to accommodate a much larger number of stations (STAs) than the existing WLAN technology.

In addition, the wide area WLAN technology needs to simultaneously support STAs having various service types, traffic types, and power save requirements, such as an offloading terminal and a sensor terminal.

A wide area wireless LAN system is being developed in order to reduce collisions during channel access and to efficiently save power by grouping a large number of STAs. In addition, the broadband WLAN system is being developed to efficiently use limited resources such as bandwidth (BW), time, and power.

In an embodiment, a method of allocating a resource in a WLAN system may include: determining a restricted access bandwidth (RAB) interval based on at least one of a plurality of bandwidths or one partial bandwidth; And setting a restricted access window in the time domain based on the limited access bandwidth section.

The resource allocation method according to an embodiment may further include checking a situation of a basic service set (BSS) including an access point (AP) and at least one station. have.

The resource allocation method according to an embodiment may further include transmitting information about the RAB interval and the RAW to a station.

In one embodiment, a communication method in a WLAN system includes: receiving information about a restricted access bandwidth (RAB) section and a restricted access window (RAW); Determining whether communication is possible in the frequency domain determined based on the RAB interval; And transmitting data in a time domain determined based on the RAW when communication in the frequency domain is possible.

According to an embodiment, an apparatus for allocating a resource may include: a RAB interval determination unit configured to determine a restricted access bandwidth (RAB) interval based on at least one of a plurality of bandwidths or a partial bandwidth of one of a plurality of bandwidths; ; And a RAW setting unit configured to set a restricted access window in the time domain based on the limited access bandwidth section.

The apparatus for allocating a resource according to an embodiment may further include a status check unit for checking a status of a basic service set (BSS) including an access point (AP) and at least one station.

The apparatus for allocating a resource according to an embodiment may further include a communication unit configured to transmit information regarding the RAB interval and the RAW to a station.

In one embodiment, a communication terminal includes: a communication unit configured to receive information regarding a restricted access bandwidth (RAB) section and a restricted access window (RAD); And a controller configured to determine whether communication is possible in the frequency domain determined based on the RAB interval, and wherein the communication unit transmits data in the time domain determined based on the RAW when communication is possible in the frequency domain. Can be.

According to one embodiment, by enabling a variable frequency in the time grouped windows in the WLAN system, it is possible to improve the transmission speed and performance without additional burden.

1 is a diagram for describing multiple bandwidths of a wide area wireless LAN system according to an embodiment.

2 is a diagram illustrating an exemplary structure of an IEEE 802.11 system to which the present invention can be applied.

3 is a diagram illustrating a detailed configuration of an apparatus for allocating resources in a WLAN system according to an embodiment.

4 is a diagram illustrating a detailed configuration of a communication terminal in a wireless LAN system according to an embodiment.

5 to 6 are diagrams illustrating an example for describing a method of allocating resources according to an embodiment.

7A to 7B are diagrams for describing an example of the configuration of a duplication mode frame according to an embodiment.

8A to 8B are diagrams for describing an example of a configuration of a duplication mode frame according to another embodiment.

9 is a flowchart illustrating an operation of a resource allocation method in a WLAN system according to an embodiment.

10 is a flowchart illustrating an operation of a communication method in a WLAN system according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

The following embodiments combine the components and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, some components and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

In some instances, well-known structures and devices are omitted or shown in block diagram form, centering on the core functions of each structure and device, in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-A (LTE-Advanced) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various radio access systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA). For clarity, the following description focuses on the IEEE 802.11 system, but the technical spirit of the present invention is not limited thereto.

A wide area WLAN system, for example, a WLAN system defined in the IEEE 802.11ah standard, may support multiple bandwidths. The multiple bandwidths can include a first bandwidth having the lowest signal-to-noise ratio and a second bandwidth that is twice the first bandwidth. In this case, the value of the first bandwidth may be 1 MHz.

Referring to FIG. 1, the multi-bandwidth may include a 1 MHz bandwidth 110, a 2 MHz bandwidth 120, a 4 MHz bandwidth 130, an 8 MHz bandwidth 140, and a 16 MHz bandwidth 150. The frequency band of the wide area wireless LAN system may be 1 GHz or less.

Thus, "multiple bandwidths include 1 MHz, 2 MHz, 4 MHz, 8 MHz, and 16 MHz."

For example, the lower frequency limit 161 of FIG. 1 may be a value between 700 and 920 [MHz], and the upper frequency limit 163 may be a value between 750 and 930 [MHz].

As shown in FIG. 1, the 1 MHz bandwidth 110 may be allocated over an entire channel, and the

remaining bandwidths

120, 130, 140, and 150 may be allocated only to a portion of the entire channel.

For example, the 16 MHz bandwidth 150 may be allocated between the frequency upper limit value 163 at 165 of FIG. 1. Referring to FIG. 1, 8 MHz is allocated to the 2 MHz bandwidth 120, 4 channels are allocated to the 4

MHz bandwidth

130, and 2 channels are allocated to the 8 MHz bandwidth 140. However, the channel assignment shown in FIG. 1 is exemplary, and the number and frequency bands of the channels can be configured in various ways.

In the present specification, a transmission mode having a bandwidth value of 1 MHz (110) may be referred to as a 1 MHz mode, and a transmission mode having a bandwidth value of 2 MHz (120) may be referred to as a 2 MHz mode. The transmission modes when the bandwidth values are 4 MHz (130), 8 MHz (140), and 16 MHz (150) may be referred to as 4 MHz mode, 8 MHz mode, and 16 MHz mode, respectively.

According to an embodiment, the 1 MHz mode represents a transmission mode having 32 subcarriers while maintaining an orthogonal frequency division multiplexing (OFDM) symbol structure. At this time, since the 1MHz mode uses a frequency domain repetition transmission scheme, the transmission rate among the bandwidths may be the lowest. In 1MHz mode, the signal-to-noise ratio is low, allowing signals to be sent over the longest distance.

The IEEE 802.11 system may be configured with a basic service set (BSS) representing a basic building block. 2 exemplarily shows two STAs (STA 1 220 and STA 2 230) as BSS members. The communication device 210 may be an access point (AP) or a base station.

In FIG. 2, an ellipse 211 indicating a BSS may be understood as representing a coverage area in which STAs (or communication terminals) included in the BSS maintain communication. This area may be referred to as a basic service area (BSA). When the STA moves out of the BSA, the STA cannot directly communicate with other STAs in the BSA.

An Access Point (AP) is a base station (BS), a Node-B (Node-B), an evolved Node-B (eNB), a base transceiver system (Base) in other wireless communication fields. It may correspond to a transceiver system (BTS), a femto base station (Femto BS).

Beacon frame (beacon frame) is one of the management frame (management frame) in IEEE 802.11, it can be transmitted periodically to inform the presence of the wireless network, the STA performing scanning to join the wireless network to find the wireless network. .

In the BSS, the AP may periodically transmit a beacon frame. When the STA performing the scanning receives the beacon frame, the STA may store the information on the BSS included in the beacon frame and record beacon frame information in each channel while moving to another channel. Upon receiving the beacon frame, the STA may store BSS related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner.

STA 1 220 and STA 2 230 are terminals capable of receiving and demodulating both a signal transmitted in a 1 MHz mode and a signal transmitted in a 2 MHz mode, respectively.

For example, when the communication device 210 transmits a signal using the 2 MHz mode, the STA 1 220 may receive the signal but the STA 2 230 may not receive the signal.

The 1MHz mode has the longest signal transmission distance compared to other modes. When the communication device 210 transmits a signal using the 1 MHz mode, not only the STA 1 220 but also the STA 2 230 may receive the signal. Therefore, a duplication mode using 2 MHz as a basic bandwidth is required and a duplication mode using 1 MHz as a basic bandwidth.

3 is a diagram illustrating a detailed configuration of an apparatus 300 for allocating a resource in a WLAN system according to an exemplary embodiment.

Referring to FIG. 3, the resource allocation apparatus 300 may include a restricted access bandwidth (RAB) section determiner 320 and a restricted access window (RAW) setter 330. In addition, the resource allocation apparatus 300 may further include a status check unit 310 and a communication unit 340. According to an embodiment, the resource allocation apparatus 300 may operate in a built-in access point.

The situation check unit 310 may check a situation of a basic service set including an access point and at least one STA. For example, the situation checker 310 may check a vulnerable situation of an overlapping basic service set (OBSS) such as a periodic mute interval. Unless it is a non-traffic indication map (TIM), the situation of making certain bandwidth modes available can only be affected by the OBSS. The situation check unit 310 may provide the situation information on the OBSS to the RAB section determination unit 320. In the WLAN system, the STA may recognize the existence of data to be transmitted to the STA based on the TIM (Traffic Indication Map) element.

The RAB interval determination unit 320 may determine a restricted access bandwidth (RAB) interval based on at least one bandwidth or one partial bandwidth among the plurality of bandwidths. The RAB section represents the monopoly section on the frequency axis. Based on the RAB interval, the frequency region in which the station is allowed to access may be determined. For example, only data transmissions smaller than or equal to the bandwidth of the configured RAB may be allowed, or only data transmissions greater than or equal to the bandwidth of the configured RAB may be allowed.

The RAB section determination unit 320 may determine the RAB section based on the situation information on the OBSS provided from the situation checker 310. The RAB interval determination unit 320 may determine any one bandwidth or any one partial bandwidth among the plurality of bandwidths based on the situation of the basic service set. The RAB interval determination unit 320 may determine the RAB interval based on the determined one bandwidth or one partial bandwidth. For example, the RAB interval determination unit 320 may determine the third bandwidth from the left at a specific bandwidth or a specific partial bandwidth (eg, 16 MHz BSS operation) determined to be clean for the OBSS based on the situation information on the OBSS. 4 MHz bandwidth), and the determined specific bandwidth or specific partial bandwidth may be determined as the RAB interval.

The RAB interval determiner 320 may identify an available bandwidth by periodically setting a mute interval in order to measure interference from the OBSS. To this end, in the downlink transmission, it is necessary to be able to set an initially intended bandwidth plan for all STAs according to a transmission plan. Therefore, it should be allowed to allow overlap between individual slots.

The RAW setting unit 330 may set a restricted access window in the time domain based on the RAB section determined by the RAB section determining unit 320. RAW is a monopoly section on the time axis, and represents a predetermined time interval in which only specific STA (s) are allowed access. The RAW may determine a time domain in which the STA is allowed to access. By setting RAW on the time axis, STA's connection attempts can be distributed.

The RAW setting unit 330 may control the STA to access the data transmission in a specific bandwidth only in a specific time interval by setting the RAW in the RAB interval. For example, since RAW is set in the RAB interval, the time interval entry of the RAW may be allowed only for data transmission that is smaller than or equal to (or greater than or equal to) the bandwidth set. Accordingly, the utilization rate of frequency resources in terms of the overall BSS can be improved.

For example, when the BSS is in the 8MHz mode, the RAB interval determiner 320 may set the frequency interval of "4MHz or more" on the frequency axis to allow only right 4MHz, left 4MHz, or 8MHz data transmission. At this time, the RAW setting unit 330 may allow only the right 4MHz, left 4MHz, or 8MHz data transmission in the time interval corresponding to the set RAW by setting the RAW for the RAB interval determined on the frequency axis.

As another example, when the BSS is in the 16 MHz mode, the RAB interval determiner 320 may set a frequency interval of “2 MHz or less” on the frequency axis to allow only 2 MHz or 1 MHz data transmission. In this case, the RAW setting unit 330 may allow only 2MHz or 1MHz data transmission in a time section corresponding to the set RAW by setting the RAW for the RAB section determined on the frequency axis.

The RAW setting unit 330 may set the priority of RAW based on the bandwidth used by the STA. The RAW setting unit 330 may group and assign STAs according to the priority of RAW. The RAW setting unit 330 may set the RAW for each station within the beacon interval based on the priority of the RAW. The RAW setting unit 330 may set the RAW for the STA so that the STA (s) using the larger bandwidth is prioritized in the beacon period in time.

The communication unit 340 may transmit information on the RAB interval and the RAW to the STA. When transmitting data to the STA in downlink (DL) data transmission, the communication unit 340 may arrange the data in units of slots. The communication unit 340 may simultaneously perform a plurality of bandwidth transmissions without overlapping on the frequency axis. The communication unit 340 may improve frequency efficiency by performing multi-channel transmission in a slot unit.

The communication unit 340 may transmit information on the RAB interval to the STA at every slot start time using a duplication mode frame or a sync frame. The communication unit 340 may broadcast a broadcast at each slot start time using a frame in the form of duplication in which the available frequency range of the corresponding slot becomes. Or, the communication unit 340 is sync. You can also add this functionality to a frame. For example, the communication unit 340 may store the information on the RAB interval or information on the available frequency range in the signal unit (SIG) field or scrambling seed of the basic unit in the duplication mode prime to transmit to the station. have.

The communication unit 340 may be configured to effectively control the request to send (RTS) / clear to send (CTS) at the slot level (or RAW dimension) from the RTS (AP) => CTS (assigned STAs or representative STAs). The process of identifying an available frequency range in units of slots (or RAWs) may be performed first through a sequence exchange.

Whether RTS / CTS is performed at the slot level or RTS / CTS is performed between individual links, there will be a reduction in the bandwidth for each link originally intended. Therefore, there is a risk that the bandwidth used through RTS / CTS exchange will overlap. none.

In addition, for 8 MHz transmission (including primary 1 MHz), the primary / secondary channel allocation method up to 802.11ac, in which primary 1 MHz, primary 2 MHz, and primary 4 MHz are uniquely determined, is further flexible, for example, even at secondary 40 MHz. It is necessary to control the downlink transmission to a specific STA.

In order to cope with the instantaneous change of the OBSS vulnerable situation, the resource allocation apparatus 300 allows the RAB interval to be started at any time between beacon intervals, and separate indication information for starting the RAW. (For example, a list of corresponding STAs) may be provided at a start time. If the OBSS vulnerable situation changes only occasionally, you only need to display this information in a beacon. On the other hand, the bandwidth to be used may be changed in the middle due to an unexpected instantaneous situation. In this case, it should be possible to move to a time interval for another bandwidth which is not scheduled.

4 is a diagram illustrating a detailed configuration of a communication terminal 400 in a wireless LAN system according to an embodiment.

Referring to FIG. 4, the communication terminal 400 may include a communication unit 410 and a control unit 420.

The communication unit 410 may receive information about a restricted access bandwidth (RAB) section and a restricted access window (RAW) from the access point. A frequency domain in which data transmission is allowed may be determined through the RAB interval. RAW may indicate a time domain in which data transfer is permitted.

For example, the communication unit 410 may extract information about the RAB interval in the duplication mode frame or the synchronization frame received from the access point at every slot start time. The communication unit 410 may extract information on the RAB interval or information on the available frequency range from the signal field or the scrambling seed of the basic unit in the duplication mode prime.

The controller 420 may determine a frequency region to which access is allowed based on the RAB interval, and determine whether communication is possible in the determined frequency region. The RAB interval may be represented in the form of bandwidth or partial bandwidth. The RAB interval may determine a frequency region in which data transmission is allowed. For example, only data transmissions smaller than or equal to the bandwidth of the configured RAB may be allowed, or only data transmissions greater than or equal to the bandwidth of the configured RAB may be allowed.

When communication is possible in the frequency domain determined based on the RAB interval, the communication unit 410 may transmit data in the time domain determined based on the RAW. RAW may indicate a time domain in which data transfer is permitted. The frequency region determined based on the RAB interval may be any one of a frequency region less than or equal to the bandwidth set by the RAB interval and a frequency region greater than or equal to the bandwidth set by the RAB interval. By the RAB section and the RAW, the communication unit 410 may transmit data in a specific bandwidth and a specific time section. For example, data transmissions less than or equal to (or greater than or equal to) the bandwidth set by the RAB interval may be performed only in the time interval determined by RAW.

5 illustrates a case in which only a RAW is set without a RAB section being applied in a WLAN system. Accordingly, STAs (or communication terminals) may transmit data only in

predetermined time intervals

510 and 520 determined by RAW regardless of the channel or bandwidth used.

FIG. 6 illustrates a case in which a RAB interval is determined for STAs in a WLAN system and RAW is set based on the STA. Each STA may transmit data in a time interval determined by RAW in a channel or bandwidth allocated thereto.

For example, STA 1 transmits data only in the time domain of time interval 1 610 in the frequency domain of channel (CH) 1, and STA 2 only in the time domain of time interval 2 630 in the frequency domain of CH 2. Data can be transferred. In addition, STA 3 may transmit data only in the time domain of time interval 3 630 in the frequency domain of CH 3, and STA 4 may transmit data only in the time domain of time interval 4 640 in the frequency domain of CH 4. . Thereafter, STA 1 to STA 4 may transmit data in each channel and in each of the time domains 650-680 in the same process as above.

7A to 7B are diagrams for describing an example of a configuration of a duplication mode frame according to one embodiment.

7A shows a 2 MHz duplication mode frame.

In this case, the 2MHz duplication mode frame may include a base frame 710 and a duplication frame 720 that is 90 degrees out of phase with the base frame 710. Referring to FIG. 7A, in the duplication mode frame transmission, the same frame is shifted by 90 ° with respect to the DC tone and transmitted through two bands.

That is, the process of transmitting the duplication mode frame may include transmitting the base frame through the third band and simultaneously transmitting the duplication frame through the fourth band.

Accordingly, the receiving end receiving the duplication mode frame may perform demodulation even when receiving only a frame received in any one of the third band and the fourth band.

As shown in FIG. 7A, the basic frame 710 may have the same structure as the 1 MHz mode frame shown in FIG. 3. Accordingly, the basic frame 710 may include a short training field (STF), a long training field (LTF), and a SIG field.

The SIG field of the 1 MHz mode frame may have a structure in which information about bandwidth is omitted.

When configuring a duplication mode frame based on 1 MHz bandwidth, it is necessary to insert information for defining the bandwidth. For example, some bits of 4 bits defined as reserved bits of the SIG field may be used to insert information about bandwidth. In this case, the information on the bandwidth may be information on which band of the frequency axis is used in the example illustrated in FIG. 7A. In addition, some of the lower bits of the scrambler sheet in the SERVICE field may be used to define bandwidth information.

Three bits may be required to define the bandwidth divided into 1, 2, 4, 8, and 16 [MHz].

Therefore, the frame structure of the first bandwidth is a form in which information on multiple bandwidths is omitted, and a basic frame generated based on the first bandwidth may include information on the multiple bandwidths in a signal field or a service field.

7B shows a 4 MHz duplication mode frame.

The 4MHz duplication mode frame may include a base frame 710 and three duplication frames 730 that are 180 degrees out of phase with the base frame 710.

As in the example illustrated in FIG. 6, an NDP type short CTS message may be generated based on a 1 MHz bandwidth. At this time, the NDP type short CTS message has no field after "LTF2" in FIG. 7B.

8A shows a 4 MHz duplication mode frame.

In this case, the 4MHz duplication mode frame may include a base frame 810 and a duplication frame 820 that is 90 degrees out of phase with the base frame 810. Referring to FIG. 8A, in the transmission of a duplication mode frame, the same frame is shifted by 90 ° with respect to a DC tone and transmitted through two bands.

That is, the process of transmitting the duplication mode frame may include transmitting the base frame through the first band and simultaneously transmitting the duplication frame through the second band.

Accordingly, the receiving end receiving the duplication mode frame may perform demodulation even when receiving only a frame received in one of the first band and the second band.

As shown in FIG. 8A, the basic frame 810 may have the same structure as the 2 MHz mode frame shown in FIG. 4. Accordingly, the basic frame 810 may include a short training field (STF), a long training field (LTF), and a SIG field.

8B shows an 8 MHz duplication mode frame.

The 8 MHz duplication mode frame may include a base frame 810 and three duplication frames 830 that are 180 degrees out of phase with the base frame 810.

Four frames included in the 8 MHz duplication mode frame may be simultaneously transmitted through four different bands.

Accordingly, the receiving end receiving the duplication mode frame may perform demodulation or detection even when receiving only one frame among the frames transmitted through four different bands.

Although not shown in FIG. 8B, the 16 MHz duplication mode frame has a structure in which an 8 MHz duplication mode frame is repeated twice on the frequency axis.

The duplication mode frame structure shown in FIGS. 8A through 8B may be used for a request to send (RTS) and a "null data packet (NDP) type short clear to send (CTS) message transmission" having no data portion.

In operation 910, the apparatus for allocating a resource may check a situation of a basic service set including an access point and at least one station. For example, the apparatus for allocating a resource may check the vulnerabilities of the OBSS such as a periodic silent section.

In operation 920, the apparatus for allocating a resource may determine a restricted access bandwidth (RAB) interval based on at least one of the plurality of bandwidths or one partial bandwidth of the plurality of bandwidths. The RAB section represents the monopoly section on the frequency axis. Based on the RAB interval, the frequency region in which the station is allowed to access may be determined. For example, only data transmissions smaller than or equal to the bandwidth of the configured RAB may be allowed, or only data transmissions greater than or equal to the bandwidth of the configured RAB may be allowed.

The apparatus for allocating resources may determine the RAB interval based on the context information about the OBSS. The resource allocation apparatus may determine any one bandwidth or any one partial bandwidth among the plurality of bandwidths based on the situation of the basic service set. The apparatus for allocating resources may determine the RAB interval based on the determined one bandwidth or one partial bandwidth. The apparatus for allocating resources may identify an available bandwidth by periodically setting a silent section to measure interference from the OBSS.

In operation 930, the apparatus for allocating a resource may set a restricted access window (RAW) in the time domain based on the determined RAB interval. RAW is a monopoly section on the time axis, and represents a predetermined time interval in which only specific STA (s) are allowed access. The RAW may determine a time domain in which the STA is allowed to access.

The apparatus for allocating a resource may control the STA to access the data transmission in a specific bandwidth only in a specific time interval by setting RAW in the RAB interval. For example, since RAW is set in the RAB interval, the time interval entry of the RAW may be allowed only for data transmission that is smaller than or equal to (or greater than or equal to) the bandwidth set. Accordingly, the utilization rate of frequency resources in terms of the overall BSS can be improved.

The resource allocation apparatus may set the priority of RAW based on the bandwidth used by the STA. The resource allocation apparatus may assign STAs by grouping them according to the priority of RAW. The resource allocation apparatus may set the RAW for the STA so that the STA (s) using the larger bandwidth is given priority in time within the beacon period.

In operation 940, the apparatus for allocating a resource may transmit information about the RAB interval and the RAW to the STA. When the apparatus for allocating data transmits data to the STA in downlink data transmission, the resource allocation apparatus may arrange the data in units of slots. The resource allocation apparatus may simultaneously perform a plurality of bandwidth transmissions without overlapping on the frequency axis. The apparatus for allocating resources may transmit information about the RAB interval to the STA at every slot start time using a duplication mode frame or a sync frame. The resource allocation apparatus may store information on an available frequency range in a signal field or scrambling seed of a basic unit in duplication mode prime.

In operation 1010, the communication terminal may receive information regarding a restricted access bandwidth (RAB) interval and a restricted access window (RAW) from the access point. A frequency domain in which data transmission is allowed may be determined through the RAB interval. RAW may indicate a time domain in which data transfer is permitted. The communication terminal may extract information about the RAB interval in a duplication mode frame or a synchronization frame received from the access point at every slot start time.

In operation 1020, the communication terminal may determine a frequency region to which access is allowed based on the RAB interval, and determine whether communication is possible in the determined frequency region.

In step 1030, when communication is possible in the frequency domain determined based on the RAB interval, the communication terminal may transmit data in the time domain determined based on the RAW. The frequency region determined based on the RAB interval may be any one of a frequency region less than or equal to the bandwidth set by the RAB interval and a frequency region greater than or equal to the bandwidth set by the RAB interval. By the RAB interval and the RAW, the communication terminal can transmit data in a specific bandwidth and a specific time interval.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims

Determining a restricted access bandwidth (RAB) interval based on at least one of the plurality of bandwidths or one partial bandwidth of the plurality of bandwidths; And

Setting a restricted access window (RAW) in a time domain based on the limited access bandwidth interval;

Resource allocation method in a WLAN system comprising a.
The method of claim 1,

The RAB section is,

A method for allocating resources in a WLAN system, characterized in that it is used to determine a frequency domain in which a station is allowed access.
The method of claim 1,

The RAW is

A method of allocating resources in a WLAN system, characterized in that determining a time domain in which access of a station is allowed.
The method of claim 1,

The step of setting the RAW,

Setting a priority of RAW based on the bandwidth used by the station; And

Setting RAW for each station within a beacon interval based on the priority of the set RAW

Resource allocation method in a WLAN system comprising a.
The method of claim 1,

Checking the status of a basic service set (BSS) that includes an access point (AP) and at least one station;

Resource allocation method in a WLAN system further comprising.
The method of claim 5,

Determining the RAB interval,

Determining any one of the plurality of bandwidths or any one partial bandwidth based on the situation of the basic service set; And

Determining an RAB interval based on the determined one bandwidth or one partial bandwidth

Resource allocation method in a WLAN system comprising a.
The method of claim 1,

Transmitting information about the RAB interval and the RAW to a station

Resource allocation method in a WLAN system further comprising.
The method of claim 7, wherein

The transmitting of the information about the RAB interval and the RAW to the station,

The resource allocation method in a WLAN system, characterized in that for transmitting information on the RAB interval to the station using a duplication mode frame or a sync frame.
Receiving information regarding a restricted access bandwidth (RAB) interval and a restricted access window (RAD);

Determining whether communication is possible in the frequency domain determined based on the RAB interval; And

If communication is possible in the frequency domain, transmitting data in the time domain determined based on the RAW

Communication method in a WLAN system comprising a.
The method of claim 9,

The RAB section is,

A communication method in a WLAN system, characterized in that for determining the frequency domain allowed for data transmission.
The method of claim 9,

The RAW is

A communication method in a WLAN system, characterized in that it represents a time domain in which data transmission is allowed.
The method of claim 9,

The receiving step,

Extracting information on the RAB interval from a duplication mode frame or a synchronization frame received from an access point;

Communication method in a WLAN system comprising a.
The method of claim 9,

The frequency domain determined based on the RAB interval,

And a frequency range equal to or less than the bandwidth set by the RAB interval and a frequency range equal to or greater than the bandwidth set by the RAB interval.
A RAB interval determination unit configured to determine a restricted access bandwidth (RAB) interval based on at least one of a plurality of bandwidths or one partial bandwidth of the plurality of bandwidths; And

RAW setting unit for setting a restricted access window in the time domain based on the limited access bandwidth section

Resource allocation apparatus comprising a.
The method of claim 14,

The RAB interval determination unit,

A resource allocation apparatus, characterized by identifying an available bandwidth by periodically setting a mute interval.
The method of claim 14,

Situation checker for checking the status of a basic service set (BSS) including an access point (AP) and at least one station

Resource allocation apparatus further comprising.
The method of claim 16,

The RAB interval determination unit,

Determining a bandwidth or any one of a plurality of bandwidths based on the situation of the basic service set, and determines the RAB interval based on the determined one or one of the partial bandwidth. Resource allocation apparatus.
The method of claim 14,

Communication unit for transmitting the information about the RAB interval and the RAW to the station

Resource allocation apparatus further comprising.
The method of claim 18,

The communication unit,

And transmitting the information on the RAB interval in a signal (SIG) field or scrambling seed of a basic unit in duplication mode prime and transmitting the information to the station.
A communication unit receiving information regarding a restricted access bandwidth (RAB) section and a restricted access window (RAW); And

And a controller for determining whether communication is possible in the frequency domain determined based on the RAB interval.

The communication unit,

A communication terminal transmitting data in a time domain determined based on the RAW when communication in the frequency domain is possible.