WO2014007509A1

WO2014007509A1 - Apparatus and method for allocating resource

Info

Publication number: WO2014007509A1
Application number: PCT/KR2013/005851
Authority: WO
Inventors: 권형진; 이재승; 정민호; 유희정; 박재우; 이석규
Original assignee: 한국전자통신연구원
Priority date: 2012-07-02
Filing date: 2013-07-02
Publication date: 2014-01-09

Abstract

Disclosed are an apparatus and a method for allocating a resource. According to one embodiment of the present invention, a method for an access point allocating the resource in a wireless local area communication network, to allocate the resource for communication between a first station and a second station, on the basis of a slot-based channel access technique, comprises the steps of: confirming a wakeup schedule, which is established between the first station and the second station; and allocating the resource for communication between the first station and the second station through the slot-based channel access technique which reflects the confirmed wakeup schedule.

Description

Resource allocation apparatus and method

Examples described below relate to an apparatus and method for allocating resources for inter-station communication based on a slot-based channel access method by an access point managing a network in a wireless local area network (WLAN) environment, and a terminal operating accordingly. will be.

In the infrastructure mode of a WLAN, data transmitted and received between terminals is transmitted through an access point (AP). In order to more than double the channel usage efficiency, in IEEE 802.11e, a direct link setup technique exists for transmitting and receiving data directly between QoS STAs. In addition, in 802.11z, AP supports Direct Link Setup (DLS) even in non-QoS environments such as 802.11a / b / g (Tunneled DLS) and power saving mode (PSM) between terminals. A pair of QoS STAs configured with such (T) DLS exchange data directly without arbitration of the AP.

However, in an environment in which there are too many STAs in a network or collision probability between STAs is increased due to hidden nodes, one method of alleviating this is by assigning a slot-based channel access method to a slot having a certain length of a channel access interval. There is a method of dividing and assigning a slot to a slot when the STA accesses the channel.

However, other STAs, including the AP, may not know when the STA that has configured (T) DLS exchanges data directly. In particular, when operating as a TDLS Peer PSM, it periodically sleeps according to a schedule and wakes up at a specific interval, and attempts to exchange data. Since the periodic schedule is not known, the AP may overlap with resource allocation on a slot basis.

In a wireless local area network, a resource allocation method for allocating resources for communication between a first station and a second station based on a slot-based channel access scheme may include a wake-up schedule configured between the first station and the second station. Confirming; And allocating resources for communication between the first station and the second station through the slot-based channel access method reflecting the determined wake-up schedule.

A resource allocation apparatus for allocating resources for communication between a first station and a second station, based on a slot-based channel access scheme in a wireless local area network, determines a wake-up schedule established between the first station and the second station. Processing unit; And an allocator configured to allocate resources for communication between the first station and the second station through the slot-based channel access method reflecting the determined wake-up schedule.

In setting up a resource allocation for communication or a schedule setting for periodic resource allocation in a WLAN, the access point and the (T) DLS station may perform the setting together to prevent overlapping with other predetermined schedules.

In addition, by notifying other stations in the network of resource allocation for scheduled station-to-station communication, it is possible to limit their access and thus reduce power consumption due to collisions.

In addition, the power consumption can be reduced by reducing the probability that a (T) DLS STA performing direct data exchange on resources allocated according to a schedule becomes a hidden node with another station in the network and thus collision occurs.

1 illustrates a WLAN environment including an access point and a plurality of terminals to which an embodiment of the present invention can be applied.

2 is a flowchart illustrating a resource allocation method for allocating resources by an access point according to an embodiment of the present invention.

3 and 4 are flowcharts illustrating respective embodiments in which an access point determines a wake-up schedule established between a first station and a second station.

5 and 6 are diagrams illustrating an example of using a sync frame for collision or power saver when two stations are hidden nodes in a conventional slot-based channel access method.

7 illustrates a WLAN environment including an access point and a plurality of terminals according to an embodiment.

FIG. 8 is a diagram illustrating a relationship between two stations and a station which is a hidden node relationship in the conventional slot-based channel access method and the two stations.

9 is a diagram illustrating a configuration of a resource allocation apparatus according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express a preferred embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification. Like reference numerals in the drawings denote like elements.

In the WLAN, a power saving mode (PSM) method is defined in order to reduce power consumption of the terminals-STA 1 120 and STA 2 130. The access point (AP) 110 periodically transmits a beacon, and whether or not the presence of a buffered frame is provided through the TIM (Traffic Indication Map) field of the beacons-STA 1 (120), STA 2 130. Terminals-STA 1 (120), STA 2 (130)-representing as a terminal (STA), will be described below.

The STA (Station) in the sleep mode periodically wakes up to receive the TIM of the beacon transmitted by the AP 110. If the bit value of the corresponding STA is 0 in the TIM, the corresponding STA sleeps again. If 1, the STA must stay awake until the last frame scheduled for delivery in the current beacon period is delivered. The STA may determine whether the frame is the last frame by checking the MORE DATA field of the frame header transmitted by the AP 110. That is, if the MORE DATA field is 0, since the last frame, the STA may operate in the sleep mode after receiving this frame if there is no frame to transmit.

However, the power consumption of an STA in PSM mode is determined not only by the traffic to be delivered to itself but also by the amount of traffic of another STA. This is because data transmission between the AP 110 and the STA may cause an interruption in the middle due to an attempt to transmit data between the AP 110 and the other STA. If an interruption occurs, the time until the STA receives all the buffered frames becomes long, which increases the power consumption of the STA. In this situation, since the power consumption increases as the number of STAs increases, a solution STA is required for a sensor STA in which low power is important.

One solution is to reduce the number of STAs accessed simultaneously by varying the time of channel access for each STA. In this case, in order to designate the time, the AP 110 may divide the interval between the beacons or the smaller window interval into a time unit called a slot, and allocate the slot to the STA. This method is called slot-based channel access method in the present invention.

Meanwhile, WLAN (IEEE 802.11z) defines a Tunneled Direct Link Setup (TDLS) technique between STAs. The existing 802.11e DLS needs to be supported by the AP 110. The TDLS does not support the AP 110, but the TDLS Setup Request / Response / Confirm, Put a management action frame, such as TDLS Teardown, into a message in the data frame. To indicate this, the Ether type 89-0d frame of the LLC / SNAP header is used. Another feature of IEEE 802.11z is that it supports power saving mode (PSM) between TDLS peer STAs after TDLS configuration.

At this time, in an environment in which there are too many STAs in a network or a collision probability between STAs is increased by a hidden node, the AP 110 applies a channel based on the slot-based channel access method described above. A method of dividing an access period into slots having a predetermined length and allocating a time point when the STA accesses a channel to the slot can be used. The core concept of this method is to reduce the number of STAs that access at the same time by varying the time to access the channel for each STA. However, an STA that wants to directly exchange data after the previous TDLS configuration may want to overlap with a slot already allocated to another STA by the AP 110. As such, when the AP 110 allocates resources to the WLAN or adjusts a channel access time, the AP 110 needs to know at least the TDLS Peer PSM schedule. Accordingly, the access point 110 according to the embodiment of the present invention allocates a resource for communication between the first station 120 and the second station 130, along with the wakeup schedule (Wakeup Schedule) I can confirm it.

Hereinafter, an operation of allocating resources based on a slot-based channel access method by the access point 110 according to an embodiment of the present invention will be described.

1 and 2, in a wireless local area network, the access point 110 may allocate resources for communication between the first station 120 and the second station 130 based on a slot-based channel access scheme. . At this time, the resource allocation method of the access point 110 may determine the wake-up schedule set between the first station 120 and the second station 130 (210).

In addition, the resource allocation method may allocate a resource for communication between the first station 120 and the second station 130 through the slot-based channel access method reflecting the determined wake-up schedule (220).

3 illustrates a method in which TDLS peer stations inform an access point of a set PSM schedule after setting a PSM schedule with each other. In the embodiment of FIG. 4, a TDLS peer PSM schedule setting is performed by a TDLS peer station and an access point. It shows how to go together. Hereinafter, each Example is described.

Referring to FIG. 3, the first station 301 and the second station 302 may set a wake up schedule (310). More specifically, the first station 301 may transmit a TDLS Peer PSM Request Frame including a periodic wake-up schedule to the second station 302. A station that transmits a TDLS peer PSM request frame, such as the first station 301, may be called a TDLS Peer PSM Initiator or an Initiator. Also, a station that receives a TDLS peer PSM request frame such as the second station 302 and transmits a response frame thereto may be called a TDLS Peer PSM Responder or a Responder. Can be.

Upon receiving the TDLS Peer PSM Request frame, the second station 302 receives a TDLS Peer PSM Response frame that includes a status code indicating whether to accept / reject the wakeup schedule. Response frame) may be transmitted to the first station 301. Through such an operation, the first station 301 and the second station 302 may set a wake up schedule. This process is identical to the 802.11z specification.

When a wake up schedule is established between the first station 301 and the second station 302, the first station 301 may include a resource allocation request frame including a wake up schedule configured as the access point 300. ) Can be sent. That is, the access point 300 may receive a resource allocation request frame including a wakeup schedule from the first station 301 (320).

There may be various formats of the resource allocation request frame. According to one embodiment, the resource allocation request frame includes: (i) an indication field indicating a wake up schedule, and (ii) an identifier identifying the second station 302 when the value of the indication field is 1-a responder ( A field containing an address or association ID (AID)-identifying a Responder, (iii) a field containing a start time indicative of wake-up time, (iv) a field indicative of a waking time and (v) It may include at least one of the fields including the period of the wake-up schedule.

The access point 300 may determine whether to accept / deny the wakeup schedule. The access point 300 may transmit a resource allocation response frame including a status code indicating a status of accepting or rejecting the wakeup schedule to the first station 301 (330).

The first station 301 may receive a resource allocation response frame from the access point 300 and may determine the wakeup schedule by reflecting the status code. For example, when the value of the status code is a value indicating acceptance of the wakeup schedule, the first station 301 may determine the wakeup schedule transmitted to the access point 300 without change.

When the wake-up schedule is determined by reflecting the status code, the first station 301 transmits a TDLS Peer PSM Announcement Frame including the determined wake-up schedule to the access point 300 and the second station. 302). That is, the access point 300 may receive a TDLS peer PSM notification frame including a wake-up schedule determined by the first station 301 by reflecting the status code from the first station 301 (350).

According to an embodiment, the access point 300 rejects the wake-up schedule, and includes the recommended wake-up schedule recommended by the user (the access point 300) in the resource allocation response frame so as to include the first station 301). That is, when rejecting the wakeup schedule, the access point 300 transmits a resource allocation response frame including a status code having a value indicating the rejection of the wakeup schedule and a recommended wakeup schedule to the first station 301. Can be.

The first station 301 may generate a new wake-up schedule by reflecting the recommended wake-up schedule and perform the TDLS peer PSM process with the second station 302 again using the generated new wake-up schedule (340). Through this process, the first station 301 may determine a new wakeup schedule and transmit a TDLS peer PSM notification frame including the newly determined wakeup schedule to the access point 300. That is, the access point 300 may receive a TDLS peer PSM notification frame including a wakeup schedule determined by the first station 301 based on the recommended wakeup schedule from the first station 301.

Referring to FIG. 4, in order to determine the wakeup schedule, the first station 401 may transmit a TDLS peer PSM request frame including the wakeup schedule to the access point 400. That is, the access point 400 may receive a TDLS Peer PSM Request Frame including a wake-up schedule from the first station 401 (first step) 410.

The access point 400 may send a TDLS peer PSM request frame to the second station 402 (second step) 420. According to an embodiment, the TDLS peer PSM request frame transmitted from the first station 401 to the access point 400 may include a link identifier element. Thus, the access point 400 may recognize the address of the second station 402 from the link recognition element and send a TDLS peer PSM request frame to the second station 402.

Upon receiving the TDLS Peer PSM Request frame from the access point 400, the second station 402 may determine whether to accept / deny itself (the second station 402) for the wakeup schedule. In addition, the second station 402 sends a TDLS peer PSM response frame to the access point 400 that includes a first status code indicating whether the second station 402 accepts or rejects the wakeup schedule. (Third step) 430. That is, the access point 400 may receive a TDLS peer PSM response frame including the first status code from the second station 402.

The access point 400 may determine whether to accept / deny itself (the access point 400) to the access point 400 for the wakeup schedule. In addition, the access point 400 receives a TDLS peer PSM response frame including a first status code and a second status code indicating whether the user (access point 400) accepts or rejects the wakeup schedule. 401 may be transmitted (step 4).

The first station 401 may determine the wake up schedule by reflecting the first status code and the second status code. For example, if the value of both the first status code and the second status code is a value indicating acceptance of the wake up schedule, the first station 401 remains unchanged from the wake up schedule sent to the access point 400. I can confirm it.

When the wakeup schedule is determined by reflecting the first status code and the second status code, the first station 401 transmits a TDLS peer PSM notification frame including the determined wakeup schedule to the access point 400 and the second station. 402). That is, the access point 400 may receive a TDLS peer PSM notification frame including a wake-up schedule determined by the first station 401 by reflecting the first status code and the second status code from the first station 401. (Fifth step) 460.

If any of the first status code and the second status code has a value indicating rejection, the PSM schedule setup performed in the first to fourth steps is considered to be unsuccessful, so the first to fourth steps are again performed. It may be performed (450).

According to an embodiment, the access point 400 or the second station 402 may reject the wakeup schedule and propose the recommended wakeup schedule to the first station 401. At this time, the first station 401, the second station 402, and the access point 400 may repeat the first to fourth steps using the recommended wake-up schedule.

For example, if the access point 400 rejects the wakeup schedule, the access point 400 sends to the first station 401 (i) a second status code having a value indicating rejection for the wakeup schedule, (ii) transmit a TDLS peer PSM response frame that includes the first status code and (iii) the recommended wake-up schedule. As an embodiment of the recommended wake-up schedule recommended by the access point 400, the access point 400 has a cycle of the wake-up schedule of two TDLS peer stations (the first station 401 and the second station 402). Can be assigned a long value. Alternatively, the access point 400 may propose a start time of the wakeup schedule and a period of the wakeup schedule so that the access point 400 does not overlap another schedule of another access point 400 in the network allocated by the access point 400. .

Upon receiving the TDLS Peer PSM Response frame, the first station 401 generates a new wakeup schedule using the recommended wakeup schedule recommended by the access point 400, and includes a generated wakeup schedule. The request frame may be sent to the access point 400. That is, the first station 401 may repeatedly perform the first step 410 using the new wakeup schedule. Similarly, the second steps 420 to 440 may also be performed by the first station 401, the second station 402 and the access point 400 using the new wake up schedule.

Meanwhile, the frame transmitted / received at each step of the second process may be a type of public management action frame.

As described above with reference to FIGS. 3 and 4, in the resource allocation method of an access point according to an embodiment of the present invention, a station and an access point may negotiate a TDLS peer PSM schedule. Meanwhile, according to the embodiment, the second station, which is a responder, accepts the wakeup schedule, but even if the access point rejects the wakeup schedule, the first station, which is the initiator, sets the PSM schedule. Can be set. In this case, the first station may transmit the TDLS peer PSM announcement frame to the access point and the second station. However, since the access point does not protect this schedule, the probability of collision can be higher than it would otherwise be.

However, if the access point accepts the PSM schedule, the schedule interval can be protected. This may be possible by setting that a beacon sent by the access point is assigned a slot corresponding to the wakeup schedule interval to one of the first station and the second station. This can be seen through the method of allocating slots to stations in slot-based channel access. In this case, the additionally allocated slot may indicate that the slot is for TDLS rather than DL / UL with the access point. If the wake-up schedule interval of the PSM schedule is limited in channel access to the first station and the second station and included in the nested form in the interval allocated to the other station group, only the slot corresponding to the wake-up schedule interval It can indicate an exception. The station group may use the reserved AID for this purpose or may use other indication bits.

As described above, when the wakeup schedule is determined, a resource allocation method for allocating resources by the access point is performed through a slot-based channel access method reflecting the determined wakeup schedule. Can be assigned. This will be described with reference to FIGS. 7 and 8. Prior to this, a conventional slot-based channel access method will be described with reference to FIGS. 5 and 6 in order to facilitate understanding of the present invention.

5 and 6 illustrate a sync frame for a collision or power saver when two stations that sleep and wake up in a conventional slot-based channel access method are hidden nodes. Synch Frame) is a diagram showing an example of using.

A station that is allocated a slot from an access point and wakes up at a slot start does not know whether a hidden node exists. To help this, the access point may transmit a sync frame when the channel is in an idle state at slot start.

Referring to FIG. 5, in a conventional slot-based channel access scheme, a station may access a channel according to Enhanced Distributed Channel Access (EDCA) immediately after receiving a sync frame at a slot boundary from an access point. In more detail, a station in an awake state may receive a beacon message from an access point (510). In addition, the station may wake up at the slot boundary 501 to wait for channel synch (520). At this time, the access point may transmit the sync frame 502 to the station at the slot boundary 501. Accordingly, the station may sink to the channel using the sync frame 502 received from the access point, and may start channel access according to the DCF rule (530).

As another example of operation, referring to FIG. 6, when the access point determines that the channel is busy or is receiving data from the station in the slot boundary 601, the access point may not transmit a sync frame. 602. The access point may wait without accessing the channel, and the wait may be either (i) receiving a sync frame, (ii) receiving another frame from the access point, or (iii) at the end of the probe delay interval. It may continue until the branch is satisfied (waiting rule of the station). In more detail, when station x (STA x) is a hidden node for station n (STA n), station x may be sending a packet to the access point beyond slot boundary 601 ( 610). At this time, the station may wake up at the slot boundary 601 and wait for a packet to sink to the medium (620). At this time, the station cannot hear the data packet from station x. In addition, the station may sink to the channel when it receives the ACK message from the access point (630).

As described above with reference to FIGS. 5 and 6, the conventional sync frame method for solving a hidden node in a slot-based channel access method causes a problem when applied to a hidden node problem when there is a direct data exchange. .

7 and 8 show that station 2 (STA 2) 730 and station 3 (STA 3) 740 are allocated resources from the access point (AP) 710, the access point 710 transmits a sync frame The network environment is assumed assuming that an initiator (for example, station 2) performs channel access and direct data exchange. Station 1 (STA 1) 720 is also hidden from both station 2 730 and station 3 740 at this time.

For example, station 2 730 may send a packet to station 3 740 beyond the next slot boundary 801. However, the access point determines that the channel is busy and does not transmit a sync frame (802). In this case, the station 1 720 does not receive the sync frame but receives another frame, and thus performs channel access to the EDCA after the probe delay, and transmits data to the access point because the channel is idle, thus colliding with the access point. This can happen. For example, station 1 may wake up at a slot boundary and wait for a packet to sink to the medium (820). At this time, station 1 720 cannot hear data packets from station 2 730 and station 3 740. Also, station 1 720 may not receive an ACK from station 2 730 and station 3 740 to sink to the channel (830).

Therefore, a method for solving such a problem is required, and a method for solving the problem as described in FIGS. 5 to 8 will be described below.

According to one embodiment of the present invention, in order to solve the above-mentioned problem, when the resource is allocated, the access point has a weighting rule in which the station continues to wait until receiving a sync frame or another frame even after a probe delay period passes. Through the slot-based channel access scheme having, it is possible to allocate resources for communication between the first station and the second station.

That is, the resource allocation method according to an embodiment may solve the above problem by modifying the weighting rule of the station described with reference to FIG. 6. In a weighting rule according to an embodiment, the station may not receive a sync frame and may not receive another frame, but may maintain a weighting state even if a probe delay has elapsed. Because the access point does not transmit data during direct data exchange, the TDLS peer station and the hidden-in station in the network may collide by attempting to transmit to the access point after considering the channel as idle after probe delay. This is to prevent this. This phenomenon occurs in the case of overlapping basic service set (OBSS) even when a signal transmitted from a neighboring basic service set (BSS) reaches an access point and determines that the channel is busy, and stations outside this range cannot listen. Can be. In such cases, the station may continue to wait until a signal arrives from the access point even if the channel is idle after the probe delay.

According to another embodiment, when the access point allocates resources, communication between the first station and the second station is performed through a slot-based channel access method that transmits a frame indicating that the channel is busy at predetermined intervals. Allocate resources for In other words, if a sync frame indicates that the channel is idle, by defining and transmitting a frame that does the opposite, a frame indicating that the channel is busy, the station receiving the frame considers the channel busy. This allows you to transition to sleep or wait for a channel to idle.

A frame indicating that such a channel is busy may be sent by setting an initiator STA as a receiving address or by setting an AID to indicate that resources have been allocated to an initiator, thereby preventing access of another STA. have. In addition, by setting a network allocation vector (NAV) in a frame indicating that the channel is busy, the channel can be protected up to a section set by the NAV. The period of sending a frame indicating that the channel is busy may be determined in advance by the access point and the initiator. The initiator may hand over the channel to the access point to transmit a frame indicating that the channel is busy when a predetermined period during data exchange with the responder occurs.

According to another embodiment, a resource allocation method in which an access point allocates a resource indicates to a beacon that a slot corresponding to a determined wake-up schedule interval is allocated to at least one of a first station and a second station, and the displayed beacon Can be transmitted.

According to one aspect of the present invention, when the station wakes up according to the TDLS Peer PSM schedule and performs data exchange, if the data exchange is completed before a predetermined interval of the wake-up schedule and there is no more data to send, the initiator will By transmitting the CF-End frame to the access point, it can be informed that the PSM is terminated. That is, the access point may receive a CF-End frame indicating that data exchange between the first station and the second station is completed from the first station. In addition, the access point may broadcast the received CF-End frame. Thus, other stations can use the channel.

Referring to FIG. 9, the apparatus 900 for allocating a resource may allocate resources for communication between the first station 901 and the second station 902 based on a slot-based channel access method in a wireless local area network. The apparatus for allocating a resource 900 according to an embodiment may be inserted into an access point as a module and operate.

The resource allocation apparatus 900 may include a processor 910 and an allocator 920.

The processor 910 may determine a wake up schedule set between the first station 901 and the second station 902.

The allocator 920 may allocate resources for communication between the first station 901 and the second station 902 through a slot-based channel access method reflecting the determined wake-up schedule.

The processor 910 according to an exemplary embodiment may determine the wake-up schedule set between the first station 901 and the second station 902 by performing operations as described with reference to FIGS. 3 and 4.

More specifically, the processor 910 according to an embodiment may receive a resource allocation request frame including a wake-up schedule from the first station 901. In addition, the processor 910 may transmit a resource allocation response frame including a status code indicating whether to accept / deny the wakeup schedule to the first station 901. In addition, the processor 910 may receive a TDLS peer PSM notification frame including a wake-up schedule determined by the first station 901 by reflecting a status code from the first station 901.

According to another exemplary embodiment, the processor 910 may receive a TDLS peer PSM request frame including a wakeup schedule from the first station 901. In addition, the processor 910 may transmit a TDLS peer PSM request frame to the second station 902. In addition, the processor 910 may receive a TDLS peer PSM response frame including a first status code indicating whether the second station 902 accepts or rejects the wakeup schedule from the second station 902. The processor 910 may transmit a TDLS peer PSM response frame including a first status code and a second status code indicating whether the access point accepts or rejects the wakeup schedule to the first station 901. The processor 910 may receive a TDLS peer PSM notification frame including a wake-up schedule determined by the first station 901 by reflecting the first status code and the second status code from the first station 901.

Embodiments of the operation of the processor 910 determining the wakeup schedule have been described in detail with reference to FIGS. 3 and 4, and thus descriptions thereof will be omitted.

According to an embodiment, the allocator 920 indicates to the beacon that the slot corresponding to the determined wake-up schedule interval has been allocated to at least one of the first station 901 and the second station 902, and displays the displayed beacon. Can transmit

According to another exemplary embodiment, the allocator 920 may use the first station (eg, a slot-based channel access method having a weighting rule in which the station continuously waits until a sync frame or another frame is received even after the probe delay interval passes). Resources for communication between 901 and the second station 902 may be allocated.

According to another exemplary embodiment, the allocator 920 transmits a frame indicating that the channel is busy by a slot-based channel access scheme for each preset period. The first station 901 and the second station 902 may be used. Resources can be allocated for communication between

An embodiment of an operation of allocating a resource by the allocator 920 has been described in detail with reference to FIGS. 5 to 8, and thus descriptions thereof are omitted.

According to an exemplary embodiment, the processor 910 may receive a CF-End frame indicating that data exchange is completed between the first station 901 and the second station 902 from the first station 901. In addition, the processor 910 may broadcast the received CF-End frame.

Embodiments according to the present invention can be implemented in the form of program instructions that can be executed by various computer means can be recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, 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 present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Claims

A resource allocation method in which an access point allocates resources for communication between a first station and a second station in a wireless local area network, based on a slot-based channel access scheme,

Determining a wake up schedule established between the first station and the second station; And

Allocating resources for communication between the first station and the second station through the slot-based channel access scheme reflecting the determined wake-up schedule;

Resource allocation method comprising a.
Determining the wake up schedule

Receiving a resource allocation request frame including the wakeup schedule from the first station;

Transmitting a resource allocation response frame including a status code indicating a status of accepting or rejecting the wakeup schedule to the first station; And

Receiving a TDLS peer PSM notification frame including a wakeup schedule determined by the first station by reflecting the status code from the first station;

Resource allocation method comprising a.
The method of claim 2,

The resource allocation request frame

An indication field indicating the wakeup schedule;

A field comprising an identifier identifying the second station when the value of the indication field is 1;

A field containing a start time indicating a wake up time;

A field including an interval indicating a waking time; And

A field containing a period of the wakeup schedule;

Resource allocation method comprising at least one of.
The method of claim 2,

The step of transmitting the resource allocation response frame

When rejecting the wake-up schedule, transmit a resource allocation response frame including a status code having a value indicating rejection of the wake-up schedule and a recommended wake-up schedule to the first station;

Receiving the TDLS peer PSM notification frame

Receiving a TDLS peer PSM notification frame from the first station, the TDLS peer PSM notification frame including a wake-up schedule determined by the first station based on the recommended wake-up schedule

Resource allocation method.
The method of claim 1,

Determining the wake up schedule

Receiving a TDLS peer PSM request frame including the wake up schedule from the first station;

Transmitting the TDLS peer PSM request frame to the second station;

A third step of receiving a TDLS peer PSM response frame including a first status code indicating whether the second station accepts or rejects the wakeup schedule from the second station;

Transmitting a TDLS peer PSM response frame including a first status code and a second status code indicating whether the access point accepts or rejects the wakeup schedule to the first station; And

Receiving a TDLS peer PSM notification frame including a wake-up schedule determined by the first station by reflecting the first status code and the second status code from the first station;

Resource allocation method comprising a.
The method of claim 5,

The TDLS peer PSM request frame received from the first station is

Includes a link identifier element,

The second step is

Send the TDLS peer PSM request frame to the second station using the link recognition element

Resource allocation method.
The method of claim 5,

The fourth step is

When the wakeup schedule is rejected, a TDLS peer PSM response frame including a second status code, the first status code, and a recommended wakeup schedule, having a value indicating rejection of the wakeup schedule is sent to the first station. Send,

The resource allocation method

A sixth step of repeatedly performing the first to fourth steps using the recommended wake-up schedule;

Resource allocation method further comprising.
The method of claim 7, wherein

The frame transmitted / received at each step repeatedly performed in the sixth step is

Public management action frame type

Resource allocation method.
The method of claim 1,

Indicating to the beacon that the slot corresponding to the interval of the determined wake-up schedule has been allocated to at least one of the first station and the second station, and transmitting the displayed beacon

Resource allocation method further comprising.
The method of claim 1,

The method of allocating the resource

Allocating resources for communication between the first station and the second station through a slot-based channel access method having a weighting rule in which the station continues to wait until receiving a sync frame or another frame even after a probe delay interval passes.

Resource allocation method.
The method of claim 1,

Receiving a CF-End frame from the first station indicating that data exchange between the first station and the second station is completed; And

Broadcasting the received CF-End frame

Resource allocation method further comprising.
A resource allocation apparatus for allocating resources for communication between a first station and a second station based on a slot-based channel access scheme in a wireless local area network,

A processor configured to determine a wake-up schedule set between the first station and the second station; And

An allocator for allocating resources for communication between the first station and the second station through the slot-based channel access method reflecting the determined wake-up schedule.

Resource allocation apparatus comprising a.
The method of claim 12,

Processing part

Receive a resource allocation request frame including the wakeup schedule from the first station,

Transmitting a resource allocation response frame including a status code indicating a status of accepting or rejecting the wakeup schedule to the first station;

Receiving a TDLS peer PSM notification frame including a wake-up schedule determined by the first station by reflecting the status code from the first station;

Resource Allocation Device.
The method of claim 12,

Processing part

Receive a TDLS peer PSM request frame including the wakeup schedule from the first station,

Send the TDLS peer PSM request frame to the second station,

Receive a TDLS peer PSM response frame including a first status code indicating whether the second station accepts or rejects the wakeup schedule from the second station,

Transmit a TDLS peer PSM response frame including a second status code and the first status code to the first station indicating whether the access point accepts or rejects the wakeup schedule,

Receiving a TDLS peer PSM notification frame including a wake-up schedule determined by the first station by reflecting the first status code and the second status code from the first station;

Resource Allocation Device.