KR101715352B1 - Terminal Apparatus Using Wireless LAN and Method for Allocating Bandwidth in Multiple Services using the same - Google Patents

Abstract

A WLAN terminal and a bandwidth allocation method using the same are disclosed.
In the CSMA / CA medium access control method in the wireless LAN, the congestion control window value or the frame length value is calculated based on the data transmission speed, the service priority and the fairness index based on the proportional coefficient index, and the corresponding bandwidth is set. At this time, the congestion control window value is set to be in inverse proportion to the data transmission rate and the queue waiting time or the data transmission rate and the service weight, and the frame length value is set to be proportional to the data transmission rate and the queue waiting time or the data transmission rate and the service weight . The proportional coefficient is set separately for the cases where the queue waiting time is within the target maintenance range and the case where the queue maintenance time is out of the target maintenance range. The tradeoff relationship between the overall yield and the fairness is variously adjusted using the congestion control window or the frame length.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless LAN terminal and a bandwidth allocation method for real-

The present invention relates to a medium access control (CSMA / CA) technique for preventing simultaneous use of a carrier wave in a wireless LAN, and more particularly, And real-time and non-real-time data to an access point (AP).

In the uplink of the conventional wireless LAN, data is basically transmitted using the CSMA / CA medium access control method.

In the CSMA / CA medium access control method, data is transmitted after waiting for a predetermined waiting time in order to minimize collision in data transmission between a plurality of terminals and an AP. That is, a plurality of terminals wait for a waiting time = random [0, congestion window (CW)] and transmit data.

Therefore, when a CW value before a data transmission is large, a plurality of terminals have a long waiting time, and when a CW value is small, a standby time is shortened, so that a data transmission collision transmitted from each terminal can be prevented.

In the CSMA / CA medium access control method, when the frame length is increased by changing the transmission frame length (also referred to as 'TL') transmitted from each terminal, the terminal uses a lot of channels. When the frame length is shortened The terminal will use fewer channels.

The basic CSMA / CA medium access control method uses the same CW value or the same TL value.

As shown in FIG. 1, when each terminal 10, 11, 12 transmits data to the AP 20, the data transmission rate varies depending on the distance.

That is, each of the terminals 10, 11, and 12 can assume a maximum transmission rate for transmitting data to the AP 20, for example, 11 Mbps when the distance is close and 1 Mbps when the distance is long.

In this case, according to the basic CSMA / CA medium access control method, if the waiting time is the same and the frame length is the same, a terminal having a maximum transmission rate of 1 Mbps will occupy the channel for a long time and a terminal having a maximum transmission rate of 11 Mbps will shorten the channel .

Therefore, since the average yield (data amount / data transmission time) is equal to the average yield rate of the terminals with the minimum transmission rate of 1 Mbps in all the terminals, the average yield of each terminal is adjusted to the terminal having the minimum transmission rate There is a problem.

SUMMARY OF THE INVENTION The present invention is directed to a wireless LAN terminal capable of adjusting the quality of service and fairness-to-fairness relationship between a wireless LAN terminal and a real-time hybrid service using the CSMA / CA medium access control method in a wireless LAN Bandwidth allocation method.

According to an aspect of the present invention,

A parameter processing unit that periodically receives a beacon frame from an access point, wherein the beacon frame includes a service weight, a fairness index, and a scheduling mode; If the scheduling mode is a congestion control window-based mode, the congestion control window value based on the data transmission rate, the proportional coefficient index and the fairness index, wherein the congestion control window value includes the data transmission rate and the queue waiting time, A bandwidth setting unit for calculating a corresponding bandwidth by calculating a bandwidth inversely proportional to a weight; And a data transmission unit for transmitting data to the access point according to a bandwidth set by the bandwidth setting unit.

According to another aspect of the present invention,

A parameter processing unit that periodically receives a beacon frame from an access point, wherein the beacon frame includes a service weight, a fairness index, and a scheduling mode; If the scheduling mode is a frame length based mode, a frame length value based on the data rate, the proportional coefficient index and the fairness index, wherein the frame length value is the data rate and the queue latency or the data rate and the service A bandwidth setting unit for calculating a bandwidth corresponding to a weighting factor; And a data transmission unit for transmitting data to the access point according to a bandwidth set by the bandwidth setting unit.

According to another aspect of the present invention, there is provided a bandwidth allocation method,

Receiving a beacon frame from an access point, wherein the beacon frame includes a service weight, a fairness index and a scheduling mode; Determining whether the scheduling mode is a frame length based mode or a congestion control window based mode; If the scheduling mode is a frame length based mode, a frame length value based on the data rate, the proportional coefficient index and the fairness index, wherein the frame length value is the data rate and the queue latency or the data rate and the service Calculating a bandwidth corresponding to the weighting factor; And if the scheduling mode is a congestion control window based mode, determining a congestion control window value based on the data transmission rate, the proportional coefficient index, and the fairness index, wherein the congestion control window value is the data transmission rate, And inversely proportional to the service weight - to set the corresponding bandwidth.

According to the present invention, it is possible to secure an efficient quality in a multi-service using the CSMA / CA medium access control method.

In addition, it is possible to control the tradeoff relationship between the overall yield and the fairness.

1 is a diagram illustrating a configuration in which each of the conventional terminals transmits data to an access point at different data transmission rates.
2 is a block diagram of a wireless LAN wireless data network according to an embodiment of the present invention.
3 is a block diagram briefly showing the configuration of the terminal shown in FIG.
4 is a specific block diagram of the bandwidth setting unit shown in FIG.
5 is a flowchart of a bandwidth allocation method according to an embodiment of the present invention.
6 is a diagram illustrating a trade-off relationship between the overall yield and fairness of a UE according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module," and " module "in the specification mean units for processing at least one function or operation and can be implemented by hardware or software or a combination of hardware and software .

Now, a WLAN terminal according to an embodiment of the present invention and a bandwidth allocation method using the same will be described in detail with reference to the drawings.

2 is a block diagram of a wireless LAN wireless data network according to an embodiment of the present invention.

The following description assumes that the term "terminal" refers to a "WLAN terminal" capable of data transmission using the CSMA / CA medium access control method in the uplink with the AP 100.

As shown in FIG. 2, the wireless data network according to the embodiment of the present invention includes an AP 100 and a plurality of terminals 200.

The AP 100 periodically transmits a beacon frame for performing synchronization and initialization with the terminal 200 to the terminal 200. Here, the beacon frame includes a parameter for allocating bandwidth in the terminal 200. These parameters include service weight, fairness index, and scheduling mode. Herein, the service weight is an index used for determining a congestion control window (CW) value allocated to the MS 200 and a proportional coefficient for determining a transmission frame length (TL) value, and the fairness index indicates an average yield of the MS 200 This fairness index is also used to determine the CW and TL values as well as to vary the tradeoff relationship between fairness and total yield maximization. The scheduling mode will be described in detail with reference to FIG.

Accordingly, the AP 100 can change the parameters used to determine the bandwidth allocated to the terminal 200. [

A plurality of terminals 200 receives a parameter for bandwidth allocation from the AP 100 through a beacon frame and calculates a CW value or a TL value and transmits data according to the allocated bandwidth based on the calculated CW value or TL value To the AP (100).

Each terminal 200 transmits data to be transmitted to the AP 100 at a predetermined transmission rate and receives a response signal (ACK) from the AP 100.

Each terminal 200 transmits data to the AP 100 over a predetermined number of times (for example, ten times) at the above-mentioned transmission rate and then receives a response signal ACK more than a predetermined number of times from the AP 100 , Determines that the channel environment is good, increases the data transmission speed by one step, and transmits the data to the AP 100.

On the contrary, if each terminal 200 fails to receive a response signal (ACK) more than a predetermined number of times from the AP 100 after transmitting the data to the AP 100 over a predetermined number of times (for example, twice) , It is determined that the channel environment is bad, and the transmission rate is decreased by one step and transmitted to the AP 100. For example, each terminal 200 can set one of the transmission speeds of 1 Mbps, 2.2 Mbps, 5 Mbps, and 11 Mbps. After transmitting the 1 Mbps data to the AP 100 ten times, The next data will be sent at 2.2 Mbps. The transmission rate in this example is for expressing the embodiment of the present invention and may be variously set according to the wireless data network.

Next, the terminal 200 shown in FIG. 2 will be described in detail with reference to FIG.

3 is a block diagram briefly showing a configuration of the terminal 200 shown in FIG.

3, the terminal 200 includes a storage unit 210, a parameter processing unit 220, a bandwidth setting unit 230, and a data transfer unit 240.

The storage unit 210 stores various data, program files, and the like required by the terminal 200 and stores parameters required for bandwidth allocation according to the embodiment of the present invention, a CW value set according to an embodiment of the present invention , A TL value, and the like.

The parameter processing unit 220 receives the beacon frame from the AP 100 and extracts the parameters included in the received beacon frame, i.e., the service weight, the fairness index, and the scheduling mode (CW-based mode or TL-based mode) 210).

In the wireless LAN, each terminal 200 has a CW-based mode for adjusting the size of the CW and a TL-based mode for adjusting the frame length in order to efficiently distribute the fairness of the average yield.

The bandwidth setting unit 230 receives a parameter for bandwidth allocation from the AP 100 via the beacon frame by the parameter processing unit 220 and calculates a CW value or a TL value, and based on the calculated CW value or TL value Set the bandwidth. At this time, the bandwidth setting unit 230 calculates the CW value or the TL value based on the service priority and the fairness index determined by the service weight. Details of this will be explained later.

The data transmission unit 240 applies the bandwidth set by the bandwidth setting unit 230 to the CSMA / CA protocol and transmits the data to the AP 100. [ That is, the terminal 200 applies the CW value or the TL value set by the bandwidth setting unit 230 to the CSMA / CA protocol and transmits the data to the AP 100 according to the scheduling mode.

4 is a specific block diagram of the bandwidth setting unit 230 shown in FIG.

4, the bandwidth setting unit 230 includes a service determination unit 231, a proportional coefficient calculation unit 232, a TL setting unit 233, and a CW setting unit 234.

The service determination unit 231 determines the types of services, such as real-time services, non-real-time services, and non-real-time best-effort services, which are serviced by the terminal 200 according to connections.

The proportional coefficient calculation unit 232 calculates the proportional coefficient for each service using the type of service per connection determined by the service determination unit 231 and the service weight and the fairness index received from the parameter processing unit 220. [

)는 서비스별로 다음과 같이 계산된다.The proportionality factor for the k connection in the tth bandwidth allocation period (

) Is calculated as follows for each service.

)가 계산된다.First, when the k-th connection is a real-time service, the proportional coefficient (

) Is calculated.

[Equation 1]

는 단말(200)이 AP(100)로 전송할 수 있는 데이터 전송률이고,

은 단말(200)이 AP(100)로 전송할 수 있는 최대 전송률이며,

이다. 여기서,

인데,

는 k연결에 대한 최대 허용 큐(Queue) 대기 시간이고,

는 큐 대기 시간에 대한 보호(guard) 시간이다.

의 목표를 만족시키기 위해 큐 대기 시간이 최대 대기 시간인

가 아니라

이전인

를 초과했을 때 우선적인 조치를 취해 서비스 품질을 만족시키고자 한 것이다. 그리고,

는 큐 최대 대기 시간으로 서비스 클래스의 연결된 큐에 있는 패킷이 가진 대기 시간 중 최대 시간이며,

의 범위는

로 유지하는 것이 목표이다. here,

Is a data transmission rate that the terminal 200 can transmit to the AP 100,

Is a maximum transmission rate that the terminal 200 can transmit to the AP 100,

to be. here,

However,

Is the maximum allowable Queue latency for k connections,

Is the guard time against the queue wait time.

The queue wait time is the maximum wait time

Not

Formerly

And to take priority measures to satisfy service quality. And,

Is the maximum waiting time of the packets in the queue of the service class,

The range of

The goal is to keep.

인 것은 k번째 연결에 대해

가 목표 유지범위 내에 있음을 의미하며 실시간 서비스의 우선순위 계수인

보다 작아지도록 한다.Therefore, in the above-mentioned expression (1)

Is for the k-th connection

Is within the target maintenance range and the priority coefficient of the real-time service

.

인 것은 k번째 연결에 대해

가 목표 유지범위를 벗어남을 의미하므로 실시간 서비스의 우선순위 계수인

보다 크도록 한다. 이 때, 연결별로 우선순위 계수인

보다 커지는 정도는 초과지수인

와 단말(200)의 전송상태인

의 곱인

에 의해 결정된다.And,

Is for the k-th connection

Is outside the target retention range, the priority coefficient of the real-time service

. At this time, the priority coefficient

The greater the magnitude of the excess index

And the transmission state of the terminal 200

Of the

.

)를 계산하기 위해 비례계수 계산부(232)는 파라미터 처리부(220)로부터 서비스 가중치를 전달받는다. 이 때, 서비스 가중치에는 상기한 초과지수인

와 실시간 서비스의 우선순위 계수인

가 포함된다.According to the above-mentioned expression (1)

The proportional coefficient calculation unit 232 receives the service weight value from the parameter processing unit 220. [ In this case, the service weights include the above-

And the priority coefficient of the real-time service

.

가 목표 유지범위 내에 있는 경우 비례계수(

)에 실시간 서비스의 핵심인자인 현재의 큐의 지연시간을 반영하기 위해

을 우선순위 계수

에 곱한다.

을 곱한다는 의미는,

일 때는

은 1보다 크고 그 값은

이 작아질수록 커지며, 역으로

는 작아지므로 결과적으로 비례계수(

)도 작아져 TL값이 작아지고, 이로 인해 패킷 길이가 감소하여

이 큰 연결이 채널을 더 확보하도록 한다.In the above equation (1), for the k-th connection

Is within the target holding range, the proportional coefficient (

) To reflect the delay time of the current queue, which is a key factor of the real-time service

Priority coefficient

≪ / RTI >

By multiplying,

When

Is greater than 1 and its value is

The smaller it becomes,

Becomes smaller, and consequently the proportional coefficient (

) Is also reduced and the TL value becomes smaller, thereby decreasing the packet length

This larger connection ensures more channels.

일 때는, 이미 목표 유지범위를 벗어남으로 인해,

을 곱하지 않고,

일 때의 최대값인

보다 크게 되도록 한다. Meanwhile,

, There is already a deviation from the target maintenance range,

Lt; / RTI >

The maximum value

.

의 값을 더해주도록 한다.In addition, if there are several services that are out of the target maintenance range, the channel should be given more time for good connections among those urgent services.

And the value of.

일 경우,

가 가질 수 있는 최대값이

이므로

값은 0과 1 사이의 값이며,

값을 나눈 것을 단지 이러한 1보다 작은 성질을 만족시키기 위함이고,

를 곱한 것은 더 좋은 채널이 좋은 연결에게 채널 시간을 더 주도록 해서 효율성을 얻기 위한 것이다.

If it is,

The maximum value that

Because of

The value is between 0 and 1,

Value to satisfy the property of less than 1,

Is to gain efficiency by allowing better channels to give good connections more channel time.

)가 계산된다.Next, when the kth connection is a non real-time best-effort service (BE), the proportional coefficient (

) Is calculated.

&Quot; (2) "

는 최선형 서비스의 우선순위 계수이다. 그리고, 서비스 클래스 간의 중요도를 반영하여

로 되게 각 서비스별 우선순위 계수가 설정된다.here,

Is the priority factor of the best-effort service. And, to reflect the importance of service classes

The priority coefficient for each service is set.

Accordingly, the proportional coefficient calculator 232 calculates the proportional coefficient for each service according to Equation (1) or Equation (2).

)을 계산하여 데이터 전송을 위한 TL 대역폭을 설정한다.If the scheduling mode received from the AP 100 by the parameter processing unit 220 is the TL-based mode, the TL setting unit 233 sets the TL value (

) To set the TL bandwidth for data transmission.

&Quot; (3) "

는 기본으로 설정된 TL값이고,

는 비례계수 계산부(232)에 의해 계산되는 비례계수이며,

는 파라미터 처리부(220)에 의해 AP(100)로부터 수신한 공평성 지수이다.here,

Is the default TL value,

Is a proportional coefficient calculated by the proportional coefficient calculation unit 232,

Is a fairness index received from the AP 100 by the parameter processing unit 220. [

Therefore, the TL value for the k-th connection is determined by the proportionality coefficient and the fairness index of the service of the k-th connection. The TL has a larger value as the priority represented by the service importance and the channel state is better, and the channel yield is increased by using more channels.

)을 계산하여 데이터 전송을 위한 CW 대역폭을 설정한다.When the scheduling mode received from the AP 100 by the parameter processing unit 220 is the CW-based mode, the CW setting unit 234 sets the CW value for the k-th connection (

) To set the CW bandwidth for data transmission.

&Quot; (4) "

는 단말(200)에서의 전송률이 최대 전송률인

일 때의 CW값을 나타내고,

는 비례계수 계산부(232)에 의해 계산되는 비례계수이며,

는 파라미터 처리부(220)에 의해 AP(100)로부터 수신한 공평성 지수이다.here,

When the transmission rate at the terminal 200 is the maximum transmission rate

CW < / RTI >

Is a proportional coefficient calculated by the proportional coefficient calculation unit 232,

Is a fairness index received from the AP 100 by the parameter processing unit 220. [

Therefore, the CW value for the k-th connection is also determined by the proportional coefficient and the fairness index for each k-th connection. Also, the size of the CW has a smaller value as the priority represented by the service importance and the channel state is better, and the yield of the channel is increased by reducing the CSMA / CA backoff delay time.

Next, a bandwidth allocation method according to an embodiment of the present invention will be described in detail with reference to FIG.

First, the parameter processing unit 220 of the UE 200 receives a beacon frame from the AP 100, and calculates a service weight (an overflow index, a priority factor for each service) included in the received beacon frame, a fairness index and a scheduling mode And stores it in the storage unit 210 (S100).

Next, the proportional coefficient calculation unit 232 calculates the proportional coefficient for each service using the service weight values (excess index, priority coefficient for each service) received from the parameter processing unit 220 using the above-described Equations (1) and (2) (S110). Here, when the service is a real-time service, the proportional coefficient is calculated by reflecting the excess index when the waiting time of the queue is out of the target maintenance range.

Thereafter, when the scheduling mode is the TL-based mode, the TL setting unit 233 sets the TL value (Equation (3)) on the basis of the proportional coefficient and the fairness index calculated by the proportional coefficient calculation unit 232 using the above- And sets the bandwidth (S120).

If the scheduling mode is the CW-based mode, the CW setting unit 220 calculates the CW value using Equation (4) described above based on the proportional coefficient and the fairness index calculated by the proportional coefficient calculation unit 232 And sets the bandwidth (S130).

The data transmission unit 240 applies the bandwidth set in steps S120 and S130 to the CSMA / CA protocol and transmits the data to the AP 100 in step S140.

After receiving the data transmitted from the terminal 200, the AP 100 transmits a scheduling method (scheduling mode) and service weights to the terminal 200 in order to adjust the tradeoff relationship between the overall yield and fairness of the terminal 200 Can be changed. Since the changed parameters are transmitted from the AP 100 through the beacon frame, the terminal 200 receives the beacon frame in the beacon frame receiving step (S100), sets the corresponding bandwidth according to the changed parameters, To the AP 100. FIG.

FIG. 6 is a diagram illustrating a trade-off relationship between the overall yield and fairness of the terminal 200 according to the embodiment of the present invention.

AP 100 changes the parameters including the scheduling mode, the service weight, and the fairness index to adjust the tradeoff relationship between the overall yield and the fairness, and transmits the modified information to the terminal 200 periodically by loading the changed information in the beacon frame.

The terminal 200 receives a new scheduling mode and parameters from the AP 100 and calculates a CW value or a TL value to set a corresponding bandwidth.

< 1인 경우, 1보다 큰 배수의 CW값 또는 TL값으로 증감한다. At this time, as in Equations (3) and (4), the fairness index

<1, it is increased or decreased by a CW value or a TL value which is a multiple of 1 or more.

In this case, the average yield of the terminal 200 is lower than that of the low-speed terminal 200, and the average yield of the high-speed terminal 200 is further increased. Here, the high speed terminal 200 and the low speed terminal 200 determine that the high speed terminal 200 and the low speed terminal 200 are larger than the reference data transmission rate in proportion to the data transmission rate, respectively.

In other words, when the fairness index becomes smaller than the reference value, the overall yield of the terminal 200 becomes large and the fairness of the terminal 200 becomes small.

> 1인 경우, 1보다 작은 배수의 CW값 또는 TL값으로 증감한다. 이러한 경우, 단말(200)은 저속도 단말(200)인 경우 평균 수율이 소폭으로 떨어지고, 고속도 단말(200)인 경우 평균 수율이 소폭으로 증가하게 된다.Conversely,

> 1, it is increased or decreased by a CW value or a TL value which is a multiple of less than 1. In this case, the average yield of the terminal 200 is slightly reduced in the case of the low speed terminal 200, and the average yield is slightly increased in the case of the high speed terminal 200.

In other words, when the fairness index is larger than the reference value, the overall yield of the terminal 200 is reduced and the fairness of the terminal 200 is increased.

As a result, if the fairness index becomes smaller than the reference value based on the reference value, more resources are allocated to the high-speed terminal 200, and if the fairness index becomes larger than the reference value, more resources are allocated to the low- Here, the reference value means a specific point where the overall yield and fairness meet, as shown in FIG.

In consideration of this point, the AP 100 can efficiently use the network resources by setting the fairness index considering the network resource environment and the data transmission rate of the terminal 200.

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, It belongs to the scope of right.

Claims (16)

A parameter processing unit that periodically receives a beacon frame from an access point, wherein the beacon frame includes a service weight, a fairness index, and a scheduling mode;
A congestion control window value calculating unit for calculating a congestion control window value based on a data transmission rate, the proportional coefficient, and a fairness index when the scheduling mode is a congestion control window based mode, Value is inversely proportional to the data transmission rate and the queue latency or the data transmission rate and the service weight, and sets a corresponding bandwidth; And
A data transmission unit for transmitting data to the access point according to a bandwidth set by the bandwidth setting unit;
And a wireless LAN terminal. The method according to claim 1,
The bandwidth setting unit,
A service determination unit for determining a type of a service for each connection being served by the WLAN terminal;
A proportional coefficient calculation unit for calculating a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and the service weight received from the parameter processing unit according to the type of service per connection determined by the service determination unit; And
A congestion control window setting unit for calculating the congestion control window value using the fairness index received from the parameter processing unit and a proportional coefficient calculated by the proportional coefficient calculating unit and setting a corresponding bandwidth,
And a wireless LAN terminal. A parameter processing unit that periodically receives a beacon frame from an access point, wherein the beacon frame includes a service weight, a fairness index, and a scheduling mode;
And calculating a proportional coefficient indicating a priority for each service determined by the service weight, and when the scheduling mode is a frame length based mode, calculating a frame length value based on a data transmission rate, the proportional coefficient and a fairness index, Value is proportional to the data transmission rate and the queue waiting time or the data transmission rate and the service weight, and sets a corresponding bandwidth; And
A data transmission unit for transmitting data to the access point according to a bandwidth set by the bandwidth setting unit;
And a wireless LAN terminal. The method of claim 3,
The bandwidth setting unit,
A service determination unit for determining a type of a service for each connection being served by the WLAN terminal;
A proportional coefficient calculation unit for calculating a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and the service weight received from the parameter processing unit according to the type of service per connection determined by the service determination unit; And
A frame length setting unit for calculating the frame length value by using the fairness index received from the parameter processing unit and a proportional coefficient calculated by the proportional coefficient calculation unit and setting a corresponding bandwidth,
And a wireless LAN terminal. 5. The method of claim 4,
Wherein the proportional coefficient calculator calculates the proportional coefficient when the service type of the connection determined by the service determination unit is a real time service and when the queue waiting time is within a predetermined target retention range, the proportional coefficient is proportional to the queue waiting time and the data transmission rate And sets the proportional coefficient to be proportional to an excess index, which is one of the data transmission rate and the service weight, when the queue waiting time is out of the target retention range. 6. The method of claim 5,
Wherein the proportional coefficient calculation unit calculates the proportional coefficient by using the real time priority when the service type of the connection determined by the service determination unit is a real time service and the maximum value of the proportional coefficient is one of the service weights, And sets a ranking coefficient so as to be a ranking coefficient. The method according to claim 2 or 4,
Wherein the proportional coefficient calculator calculates a proportional coefficient by multiplying the proportional coefficient by the product of the data transmission rate and the best priority priority coefficient, which is one of the service weights, when the service type of the connection determined by the service determination unit is a best effort service. To the wireless LAN terminal. 3. The method of claim 2,
Wherein the congestion control window setting unit sets the congestion control window value such that the overall yield of the terminal increases and the fairness of the terminal decreases when the fairness index becomes smaller than the reference value,
When the fairness index is larger than the reference value, the congestion control window value is set such that the overall yield of the terminal is reduced and the fairness of the terminal is increased
And the wireless LAN terminal. 5. The method of claim 4,
Wherein the frame length setting unit sets the frame length value so that the overall yield of the terminal becomes larger and the fairness of the terminal becomes smaller when the fairness index becomes smaller than a reference value,
When the fairness index is larger than the reference value, the frame length value is set so that the overall yield of the terminal is reduced and the fairness of the terminal is increased
And the wireless LAN terminal. A method for allocating bandwidth for data transmission in a WLAN terminal,
Receiving a beacon frame from an access point, wherein the beacon frame includes a service weight, a fairness index and a scheduling mode;
Determining whether the scheduling mode is a frame length based mode or a congestion control window based mode;
Calculating a proportional coefficient indicating a priority for each service determined by the service weight;
If the scheduling mode is a frame length based mode, a frame length value based on the data rate, the proportional coefficient and the fairness index, where the frame length value is the data transmission rate and the queue latency or the data transmission rate and the service weight And setting a corresponding bandwidth by calculating a corresponding bandwidth; And
If the scheduling mode is a congestion control window based mode, the congestion control window value based on the data transmission rate, the proportional coefficient, and the fairness index, wherein the congestion control window value includes the data transmission rate and the queue waiting time, - &lt; / RTI &gt;&lt; RTI ID = 0.0 &gt; - &lt; / RTI &
/ RTI &gt; 11. The method of claim 10,
The step of calculating the frame length value and setting the corresponding bandwidth comprises:
Determining a type of service for each connection being served by the WLAN terminal;
Calculating a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and the service weight according to the determined type of the connection-specific service; And
Calculating the frame length value using the fairness index and the proportional coefficient and setting a corresponding bandwidth
/ RTI &gt; 11. The method of claim 10,
The step of calculating a congestion control window value and setting a corresponding bandwidth comprises:
Determining a type of service for each connection being served by the WLAN terminal;
Calculating a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and the service weight according to the determined type of the connection-specific service; And
Calculating the congestion control window value using the fairness index and the proportional coefficient and setting a corresponding bandwidth
/ RTI &gt; 13. The method according to claim 11 or 12,
In calculating the proportional coefficient,
The proportional coefficient (

When the type of the service is a real-time service,

here,

Is a priority coefficient of a real-time service, which is one of the service weights,

Is a data transmission rate that the terminal can transmit to the access point,

Is a maximum transmission rate that the terminal can transmit to the access point,

Lt;

ego,

Is the maximum allowable Queue latency for k connections,

Is a guard time for the queue wait time,

Is the queue maximum wait time,

Is an excess index that is one of the service weights
Is calculated according to the bandwidth allocation method. 14. The method of claim 13,
In calculating the proportional coefficient,
The proportional coefficient (

) Is a best-effort service when the type of the service is the following relation

here,

Is a priority coefficient of the best-effort service, which is one of the service weights,

Set to satisfy
Is calculated according to the bandwidth allocation method. 15. The method of claim 14,
In setting the bandwidth,
The frame length value (

) Satisfy the following relationship

here,

Is a frame length value set as a default,

Is the above fairness index
Is calculated according to the bandwidth allocation method. 15. The method of claim 14,
In setting the bandwidth,
The congestion control window value (

) Satisfy the following relationship

here,

When the transmission rate at the terminal is the maximum transmission rate

Lt; RTI ID = 0.0 &gt; a &lt; / RTI &gt; congestion control window,

Is the above fairness index
Is calculated according to the bandwidth allocation method.

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