KR101549328B1 - Method and Apparatus for Admission Control of WLAN for Efficient Distribution of Data Load in Heterogeneous Networks - Google Patents

Abstract

A method and apparatus for wireless LAN admission control for efficient data load distribution in a heterogeneous network environment are presented. The present invention provides a wireless LAN admission control method for efficiently distributing data load in a heterogeneous network environment, comprising: checking whether an acceptance request is received from an external terminal; acquiring a transmission rate of the corresponding terminal from the physical layer, Comparing the transmission rate with the minimum transmission rate of the user; determining whether the transmission rate is higher than or equal to the minimum transmission rate, And accepting the acceptance request of the corresponding terminal if the transmission rate is higher than or equal to the threshold transmission rate of the user.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless LAN admission control method and apparatus for efficient data load distribution in heterogeneous networks,

The present invention relates to a wireless LAN acceptance method and apparatus for efficient data load distribution in a heterogeneous network environment.

A modulation and coding scheme (MCS) is applied according to the SINR between a sender and a receiver according to the prior art, so that a data rate can be supported differently. For example, the data rate according to MSC in IEEE 802.11n is shown in Table 1.

<Table 1>

However, these conventional techniques have problems. For example, when the MAC is applied to the wireless LAN medium access control in IEEE 802.11n, the following problems may occur. 1 is an exemplary diagram of a WLAN operation for all users having the same data rate. Referring to FIG. 1, each terminal (terminal A, terminal B, terminal C, terminal D, and terminal E) may share a wireless channel based on contention between the nodes. At this time, the back-off time 110 and the remaining back-off time remaining 120 of the MSs are shown. As shown in FIG. 1, a user with a low data rate may take more time to transmit frames of the same length, which may degrade the performance of the entire network and the performance of other users. In other words, in the case of the terminal B having a low data rate, it takes more time to transmit frames of the same length, which may degrade the performance of the entire network and the performance of other users.

In addition, a problem may arise in the case of accommodating all terminals whose WiFi mode is on in the AP coverage regardless of the channel state or the traffic characteristic of the terminal. In other words, if the network continues to accept users in a saturated state, contention between users and collisions between packets may increase, thereby degrading both network performance and per-user performance. For example, a terminal with a low data rate may degrade network performance. 2 is an example of a case where a terminal having a low data rate (terminal B) degrades network performance. Referring to FIG. 2, each terminal (terminal A, terminal B, terminal C, terminal D, and terminal E) can share a wireless channel based on contention between nodes. At this time, a back-off time 210 and a remaining back-time time 220 of each terminal are shown. As shown in FIG. 2, when a user with a poor channel state is accommodated without filtering, the channel is occupied for a longer time to transmit the same data amount, thereby delaying data transmission of other user terminals and causing a performance degradation of the entire network . In other words, if a terminal B having a poor channel state is accommodated without filtering, it may occupy a channel for a longer time to transmit the same amount of data, thereby delaying data transmission of other user terminals and causing performance degradation of the entire network . Accordingly, there is a need to provide a wireless LAN admission control method that prioritizes a user who can maximize network performance in consideration of a user's channel environment and traffic characteristics in order to improve the problems of the related art and to increase utilization of wireless resources in a heterogeneous network environment need.

According to an aspect of the present invention, there is provided a wireless LAN admission control method and apparatus for receiving a user who can maximize network performance in consideration of a user's channel environment and traffic characteristics in order to increase the utilization of wireless resources in a heterogeneous network environment . A wireless LAN access point calculates a channel occupancy of a wireless channel based on a monitoring result of a predetermined time, estimates a channel congestion state of the current network through the wireless channel access point, The present invention provides a wireless LAN admission control method and apparatus for efficiently distributing data load in a heterogeneous network environment by adaptively adjusting a restriction condition on a transmission rate of a possible terminal.

According to an aspect of the present invention, there is provided a wireless LAN admission control method for efficient data load distribution in a heterogeneous network environment, the method comprising: checking whether an external user accepts an acceptance request; The method of claim 1, further comprising: comparing the transmission rate with a minimum transmission rate of the user; if the transmission rate is greater than or equal to the minimum transmission rate, And accepting the acceptance request of the corresponding terminal if the transmission rate is equal to or greater than the threshold transmission rate of the user.

Comparing the transmission rate with the threshold transmission rate of the user if the transmission rate is greater than or equal to the minimum transmission rate, calculating a channel occupancy rate of a current wireless LAN, calculating channel occupancy of the current wireless LAN using the calculated channel occupancy, Calculating a threshold channel occupancy change amount using the calculated channel allowance, estimating a threshold transmission rate of the user that can be accepted using the calculated critical channel occupancy change amount, With a threshold transmission rate of the estimated user.

If the transmission rate is smaller than the minimum transmission rate, the terminal can deny the acceptance request of the corresponding terminal.

If the transmission rate is lower than the threshold transmission rate of the user, the terminal can deny the acceptance request of the corresponding terminal.

The step of setting the traffic incidence rate of the corresponding terminal may set the traffic incidence rate of the corresponding terminal to a maximum value.

The occupancy rate of the current WLAN channel is an indicator for estimating the channel congestion state of the current network and the restriction condition on the transmission rate of the acceptable terminal according to the channel congestion state can be adaptively adjusted.

The step of calculating the channel occupancy rate of the current wireless LAN may calculate the occupancy rate of the channel using the frame transmission period or the carrier wave included in the network allocation vector.

The calculating of the channel occupancy rate of the current wireless LAN may include: when the channel occupancy rate is equal to or greater than a predetermined threshold channel occupancy rate, the channel is in a congested state; and when the channel occupancy rate is less than a predetermined threshold channel occupancy rate, .

The threshold channel occupancy rate may be set to a value that optimizes the network efficiency of the wireless LAN.

The change amount of the critical channel occupancy rate of the channel may indicate a change amount of the network congestion degree that can be increased when a specific user is accommodated in the wireless LAN.

According to another aspect of the present invention, there is provided a wireless LAN admission control apparatus for efficiently distributing data load in a heterogeneous network environment proposed in the present invention, when the acceptance request is received, A comparison unit for comparing the transmission rate with the minimum transmission rate of the user and comparing the transmission rate with the threshold transmission rate of the user, a comparison unit comparing the transmission rate with a threshold transmission rate of the user And a control unit for approving the acceptance request of the corresponding terminal if they are the same.

Wherein the setting unit calculates a channel occupancy rate of a current wireless LAN when the transmission rate is equal to or greater than the minimum transmission station, calculates a channel margin using the calculated channel occupancy rate, and uses the calculated channel margin The channel critical channel occupancy change amount is calculated, and the acceptable threshold transmission rate of the user can be estimated using the calculated channel critical channel occupancy change amount.

The control unit may reject the acceptance request of the corresponding terminal if the transmission rate is smaller than the minimum transmission rate and may reject the acceptance request of the corresponding terminal if the transmission rate is smaller than the threshold transmission rate of the user .

According to embodiments of the present invention, it is possible to prevent performance degradation caused by an excessive congestion state of a wireless LAN based on a wireless LAN admission control scheme considering channel congestion of a network. In addition, based on the admission control technique that considers the channel quality of the user and the current network congestion, the quality of experience (QoE) of the wireless LAN user can be improved by preferentially accepting users who can perform good in the wireless LAN . The adaptive load balancing scheme can be applied by adjusting the threshold value of the channel congestion degree of the wireless LAN according to the load state of the cellular network and the load balancing state with the wireless LAN.

1 illustrates an example of a wireless LAN operation when all users according to the prior art have the same data transmission rate.
FIG. 2 is a diagram illustrating a case where a terminal having a low data rate according to the related art deteriorates network performance.
3 is a flowchart illustrating a wireless LAN admission control method for efficient data load balancing in a heterogeneous network environment according to an embodiment of the present invention.
4 is a flowchart illustrating a process of comparing a transmission rate with a threshold transmission rate of a user according to an exemplary embodiment of the present invention.
5 is a block diagram of a wireless LAN admission control apparatus for efficient data load distribution in a heterogeneous network environment according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a wireless LAN admission control method for efficient data load balancing in a heterogeneous network environment according to an embodiment of the present invention.

A wireless LAN admission control method for efficiently distributing data load in a heterogeneous network environment includes: checking whether an acceptance request is received from an external user (S310); if the acceptance request is received, acquiring a transmission rate of the corresponding terminal from the physical layer; (S330) of comparing the transmission rate with a minimum transmission rate of the user in operation S330. If the transmission rate is greater than or equal to the minimum transmission rate, Comparing the transmission rate with a threshold transmission rate in step S340; accepting an acceptance request of the corresponding terminal when the transmission rate is equal to or greater than a threshold transmission rate of the user in operation S350; And rejecting the acceptance request of the corresponding terminal (S370).

In step S310, an external user can confirm whether there is an acceptance request. The proposed method can maximize the network performance considering the user 's channel environment and traffic characteristics in order to increase the utilization of radio resources in heterogeneous networks. Accordingly, in order to preferentially accommodate a user who can maximize network performance in consideration of the user's channel environment and traffic characteristics, it is possible to confirm whether there is an acceptance request from an external user.

In step S320, if there is an acceptance request from an external user, it is possible to acquire the transmission rate of the corresponding terminal from the physical layer and set the traffic incidence rate of the corresponding terminal. At this time, the transmission rate of the corresponding terminal can be obtained in order to calculate the channel occupancy rate, channel margin, critical channel occupancy, critical channel occupancy rate, critical rate, and the like of the wireless LAN. Then, the traffic occurrence rate of the terminal can be set to a maximum value. For example, the transmission rate of the user who sent the acceptance request can be denoted by R _d . The AP can obtain the physical layer transmission rate R _d of the user who has sent the acceptance request from the physical layer. Then, the traffic incidence rate of the user who sent the acceptance request can be expressed by μ. In the case of a user not connected to the wireless LAN network, since the AP can not grasp the traffic characteristics, the rate of occurrence of DL / UL traffic for the user can be set to a maximum value. The traffic occurrence rate μ can be expressed as follows.

Here, μ _max denotes a user of the peak traffic rate (paket / sec or frame / sec), R _max denotes a maximum transmission rate (bps) that can provide a physical layer in an ideal channel environment, L _d is data Indicates the frame size (bit / frame).

In step S330, the transmission rate may be compared with the minimum transmission rate of the user. For example, the minimum transmission rate of a user can be expressed as R _min . The minimum transmission rate _Rmin of the user may indicate a limit on the minimum transmission rate of the acceptable user regardless of the current channel status. This can be set in advance to prevent the threshold value for the transmission rate from becoming too low when the channel margin is sufficient. The preset minimum transmission rate of the user can be compared with the transmission rate R _min .

In step S340, if the transmission rate is equal to or greater than the minimum transmission rate, the transmission rate may be compared with the threshold transmission rate of the user.

Comparing the transmission rate with the threshold transmission rate of the user when the transmission rate is equal to or greater than the minimum transmission rate; calculating a channel occupancy rate of the current wireless LAN by using the calculated channel occupancy; Calculating a margin rate, calculating a threshold channel occupancy change amount using the calculated channel allowance, estimating a threshold transmission rate of the user acceptable using the calculated threshold channel occupancy change amount, And comparing the rate with a threshold transmission rate of the estimated user. Referring to FIG. 4, comparing the transmission rate with the threshold transmission rate of the user (S340) will be described in more detail.

4 is a flowchart illustrating a process of comparing a transmission rate with a threshold transmission rate of a user according to an exemplary embodiment of the present invention.

Comparing the transmission rate with the threshold transmission rate of the user if the transmission rate is equal to or greater than the minimum transmission rate, calculating a channel occupancy rate of the current wireless LAN in operation S410; (S430) a step of calculating a channel margin rate using the calculated channel margins, a step (S430) of calculating a threshold channel occupancy variation using the calculated channel margin, a step Estimating a transmission rate (S440), and comparing the transmission rate with a threshold transmission rate of the estimated user (S450).

In step S410, the channel occupancy rate of the current wireless LAN can be calculated. The occupancy rate of the current WLAN channel may indicate an indicator for estimating the channel congestion state of the current network. According to the channel congestion state, the restriction condition on the transmission rate of the acceptable terminal can be adaptively adjusted. If the channel occupancy rate is equal to or greater than a preset threshold channel occupancy rate, the channel may be in a congested state. Also, if the channel occupancy is less than a preset threshold channel occupancy, the channel may be in a free state. At this time, the preset threshold channel occupancy rate may be set to a value that optimizes the network efficiency of the wireless LAN.

For example, the channel occupancy of the current wireless LAN can be expressed as O _CH . Channel share O _CH may now indicate an index for estimating the congestion of the network channel (channel congestion) state. The AP can calculate the channel occupancy by periodically observing the corresponding channel according to a predetermined monitoring window size (T _monitor ). The channel congestion of the current network can be estimated based on the calculated channel occupancy. The channel occupancy O _CH is the moving average of the observed channel occupancies O _{CH, 0} , O _{CH, -1} , ..., O _{CH, - (K-1) over} the recent K monitoring periods (T _monitor ) average (0 = _{OCH, -k} = 1, fork = 0, ..., K-1). The channel occupancy O _CH can be expressed by Equation (1).

수학식1

Equation 1

At this time, the channel occupancy rate in the k-th previous monitoring period from the present can be represented by O _{CH, -k} , and can be expressed by Equation (2).

수학식2

Equation 2

Where T _monitor represents the monitoring window size, T ⁱ _occ represents the channel occupancy time of DL / UL traffic for user i (T ⁱ _occ = T ^{i, DL} _occ + T ^{i, UL} _occ ), n represents the number of users accessing the wireless LAN at the time of monitoring. At this time, the observation of the channel occupancy time T ⁱ _occ of the traffic for the user i can be observed using a frame transmission period included in the network allocation vector (NAV) or carrier sensing. For example, when observing using the frame transmission period included in the network allocation vector (NAV), the DL traffic (T ^{i, DL} _occ ) directly confirms the NAV value of the frame from the AP to the user i And the UL traffic (T ^{i, UL} _occ ) can be received by the AP by receiving the NAV transmitted by the user i. Also, it is possible to check the channel occupancy state by monitoring the energy level of the radio frequency in the physical layer using carrier sensing.

For example, the critical channel occupancy of a wireless LAN can be expressed as O ^* _CH . When the channel congestion increases beyond a certain level, the collision between packets increases, which may degrade not only the performance per user but also the overall performance of the network. In order to prevent the deterioration of the network performance, if the channel occupancy rate O _CH of the wireless LAN is more than a certain level, it is determined that the congestion degree is different from the maximum value, and the upper limit of the channel occupancy O _CH is set so as not to accept the discrete user, O ^* _CH . &Lt; / RTI &gt; In other words, O _CH ≥ O ^* _CH indicates that the channel is congested and no further user acceptance is possible. If O _CH <O ^* _CH , it indicates that the channel is in a free state, and further user acceptance is possible. The threshold channel occupancy O ^* _CH can be set to a value that can optimize the network efficiency of the wireless LAN and can be adjusted to a suboptimal value for load balancing according to the load condition of the heterogeneous network.

In step S420, the channel margin can be calculated using the calculated channel occupancy. For example, the channel margin can be expressed as M _CH . Channel _CH margin M may be defined as the difference between the threshold and the current channel share O ^* _{CH CH} O share the observed channel, it can be expressed as shown in equation (3).

수학식3

Equation 3

In step S430, the threshold channel occupancy change amount can be calculated using the calculated channel allowance. The amount of change in the threshold channel occupancy rate may indicate the amount of change in network congestion that can be increased when a specific user is accommodated in the wireless LAN. For example, the amount of change in the critical channel occupancy can be expressed as DELTA O ^* _CH . The critical channel occupancy change amount [Delta] O ^* _CH can represent a network congestion degree that can be increased when a specific user is accommodated in a wireless LAN. In other words, the threshold value for the variation of the channel occupancy rate can be expressed. The threshold value for the user's transmission rate which can be additionally accepted in the current channel state can be adaptively adjusted according to the threshold channel occupancy change amount DELTA O ^* _CH . The setting of the threshold channel occupancy change amount DELTA O ^* _CH can be set by the following method. For example, the current channel margin M _CH can be used as is (ΔO ^* _CH = M _CH ). As another method, there is a method of dividing the current channel occupancy rate into M categories and allocating a threshold value of the channel occupancy change amount that can be accommodated in each category to a discrete value. Table 2 shows an example of a method of allocating the threshold value of the channel occupancy change amount to a discrete value by dividing into M categories.

<Table 2>

In step S440, the threshold transmission rate of the user that can be accepted can be estimated using the calculated critical channel occupancy variation. Conditions for authorization to accept requests from any of the user is that which can be generated by receiving a user's channel share change ΔO when _CH is not expected to exceed the threshold value ΔO ^* _CH in channel share variation (ΔO _CH = ΔO ^* _CH) only You can approve. Then, the threshold transmission rate of the acceptable user can be expressed as R ^* _d . The critical transmission rate R ^* _d can be expressed using Equation (4).

수학식4

Equation 4

Where R _min represents a limit on the minimum transmission rate of the acceptable user irrespective of the current channel state. This is a setting to prevent the threshold value for the transmission rate from becoming too low when the channel margin is sufficient.

In step S450, the transmission rate may be compared with the threshold transmission rate of the estimated user. Any user acceptance request acceptance condition can only accept acceptance when the transmission rate R _d of the user is greater than the threshold transmission rate R ^* _d (R _d ≥ R ^* _d ). Therefore, step S350 can be started. On the other hand, the transfer rate R _d is to start is lower than the threshold of the user transmission rate R _d ^*, step (S360). In other words, an admission request acceptance of any user can be rejected.

Referring again to FIG. 3, in step S350, if the transmission rate is equal to or greater than the threshold transmission rate of the user, the terminal can approve the acceptance request of the corresponding terminal.

The user, in other words, if the authorization of the terminal to be accepted variation expected channel share ΔO _CH is expressed as Equation (5).

수학식5

Equation 5

Also, the channel occupancy O ' _CH expected when the user, that is, the admission request of the terminal is approved, can be expressed by Equation (6).

수학식6

Equation 6

In step S360, if the transmission rate is smaller than the minimum transmission rate, the terminal can deny the acceptance request. Also, even if the transmission rate is lower than the threshold transmission rate of the user, the terminal can reject the request for acceptance.

5 is a block diagram of a wireless LAN admission control apparatus for efficient data load distribution in a heterogeneous network environment according to an embodiment of the present invention.

The wireless LAN admission control apparatus 500 for efficient data load distribution in a heterogeneous network environment may include a receiving unit 510, a setting unit 520, a comparing unit 530, and a controlling unit 540.

The receiving unit 510 may receive an acceptance request from an external user.

When there is an acceptance request from an external user, the setting unit 520 can acquire the transmission rate of the corresponding terminal from the physical layer and set the traffic incidence rate of the corresponding terminal. The setting unit 520 can calculate the channel occupancy of the current wireless LAN when the transmission rate is equal to or greater than the minimum transmission station and calculate the channel margin using the calculated channel occupancy. In addition, the channel critical channel occupancy change amount can be calculated using the calculated channel clearance, and the acceptable threshold transmission rate of the user can be estimated using the calculated channel critical channel occupancy change amount.

The comparing unit 530 may compare the transmission rate with the minimum transmission rate of the user and compare the transmission rate with the threshold transmission rate of the user.

The control unit 540 can approve the acceptance request of the corresponding terminal if the transmission rate is equal to or greater than the threshold transmission rate of the user. If the transmission rate is less than the minimum transmission rate, the control unit 540 rejects the acceptance request of the corresponding terminal, and if the transmission rate is lower than the threshold transmission rate of the user, have.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), a PLU a programmable logic unit, a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media 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 machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI &gt; or equivalents, even if it is replaced or replaced.

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

Claims (13)

A wireless LAN admission control method comprising:
Checking whether there is an acceptance request from an external user;
Acquiring a transmission rate of the corresponding terminal from the physical layer and setting a traffic incidence rate of the corresponding terminal when the acceptance request is received;
Comparing the transmission rate with a minimum transmission rate of the user;
Comparing the transmission rate with a threshold transmission rate of the user if the transmission rate is greater than or equal to the minimum transmission rate; And
And accepting the acceptance request of the corresponding terminal if the transmission rate is equal to or greater than the threshold transmission rate of the user,
Comparing the transmission rate with the threshold transmission rate of the user if the transmission rate is greater than or equal to the minimum transmission rate,
Calculating a channel occupancy rate of a current wireless LAN;
Calculating a channel margin using the calculated channel occupancy;
Calculating a threshold channel occupancy change amount using the calculated channel allowance;
Estimating a threshold transmission rate of the user acceptable using the calculated critical channel occupancy change; And
Comparing the transmission rate with a threshold transmission rate of the estimated user
Wherein the wireless LAN adapter comprises: delete The method according to claim 1,
If the transmission rate is lower than the minimum transmission rate, rejecting the acceptance request of the corresponding terminal
Wireless LAN admission control method. The method according to claim 1,
If the transmission rate is lower than the threshold transmission rate of the user, the reception request of the corresponding terminal is rejected
Wireless LAN admission control method. The method according to claim 1,
The step of setting the traffic incidence rate of the corresponding terminal
The traffic incidence rate of the corresponding terminal is set to a maximum value
Wireless LAN admission control method. The method according to claim 1,
Wherein the occupancy rate of the current WLAN channel is
The present invention is an indicator for estimating a channel congestion state of a current network, and a constraint on a transmission rate of an acceptable terminal according to the channel congestion state is adaptively adjusted
Wireless LAN admission control method. The method according to claim 1,
The step of calculating the channel occupancy rate of the current wireless LAN includes:
The frame transmission period included in the network assignment vector or the carrier wave detection is used to calculate the occupancy rate of the channel
Wireless LAN admission control method. The method according to claim 1,
The step of calculating the channel occupancy rate of the current wireless LAN includes:
When the channel occupancy rate is equal to or greater than a predetermined threshold channel occupancy rate, the channel is in a congested state, and when the channel occupancy rate is less than a predetermined threshold channel occupancy rate,
Wireless LAN admission control method. 9. The method of claim 8,
The threshold channel occupancy rate is set to a value that optimizes the network efficiency of the wireless LAN
Wireless LAN admission control method. The method according to claim 1,
The amount of change in the threshold channel occupancy rate of the channel indicates a change amount of the network congestion degree that can increase when a specific user is accommodated in the wireless LAN
Wireless LAN admission control method. A wireless LAN admission control apparatus comprising:
A receiving unit for receiving an acceptance request from an external user;
A setting unit configured to acquire a transmission rate of a corresponding MS from the physical layer and to set a traffic rate of the corresponding MS when the acceptance request is received;
A comparing unit comparing the transmission rate with a minimum transmission rate of the user and comparing the transmission rate with a threshold transmission rate of the user; And
And if the transmission rate is higher than or equal to the threshold transmission rate of the user,
Lt; / RTI &gt;
Wherein,
Calculating a channel occupancy rate of a current wireless LAN when the transmission rate is higher than or equal to the minimum transmission station, calculating a channel margin using the calculated channel occupancy rate, and using the calculated channel margin, And estimates the acceptable threshold transmission rate of the user using the calculated channel critical channel occupancy change amount. delete 12. The method of claim 11,
Wherein,
Rejects the acceptance request of the corresponding terminal if the transmission rate is lower than the minimum transmission rate and rejects the acceptance request of the corresponding terminal if the transmission rate is lower than the threshold transmission rate of the user
Wireless LAN admission control device.

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