KR20120002086A - Terminal apparatus using wireless lan and method for allocating bandwidth in multiple services using the same - Google Patents

Abstract

PURPOSE: A bandwidth allocation method of real time complex service using wireless LAN terminal is provided to effectively secure service qualities using a CSMA/CA(Carrier Sense Multiple Access/Collision Avoidance) medium access control method. CONSTITUTION: A parameter processing unit(220) periodically receives a beacon frame from an AP(Access Point). A bandwidth establishment unit(230) calculates a congestion control value based on a detachment value, a data transmission speed, and a proportional index in case a scheduling mode is matched with a congestion control window mode. The bandwidth establishment unit establishes bandwidth. A data transmission unit(240) transmits data according to the bandwidth established by the bandwidth establishment unit to the AP.

Description

Terminal Apparatus Using Wireless LAN and Method for Allocating Bandwidth in Multiple Services using the same}

The present invention relates to a carrier Sense Multiple Access / Collision Avoidance (hereinafter referred to as "CSMA / CA") medium access control technology in a wireless LAN, in particular, a wireless LAN terminal access point The present invention relates to a bandwidth allocation method of a real-time composite service in uplink that transmits real-time and non-real-time data to an access point (AP).

In the uplink of the WLAN according to the prior art, data is basically transmitted using a CSMA / CA medium access control method.

In the CSMA / CA medium access control method, the data is waited for a predetermined waiting time in order to minimize a collision in data transmission between a plurality of terminals and the AP. That is, the plurality of terminals waits for a waiting time = random [0, a congestion window (hereinafter, also referred to as 'CW') and transmits data.

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

In addition, 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, and when the frame length is shortened, The terminal uses fewer channels.

The basic CSMA / CA media 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, a data transmission rate varies according to distance.

That is, each terminal 10, 11, 12 may assume that the maximum transmission rate for transmitting data to the AP 20, for example, 11Mbps if the distance is close, 1Mbps if the distance is far.

In this case, according to the basic CSMA / CA medium access control method, when the waiting time is the same and the frame length is the same, the terminal with the maximum transmission rate of 1 Mbps occupies the channel long, and the terminal with the maximum transmission rate of 11 Mbps shortens the channel. Occupied.

Therefore, in all terminals, the average yield (data amount / data transmission time) becomes equal to the average yield of the terminal having a minimum transmission rate of 1 Mbps, and as a result, the average yield of each terminal is adjusted to the terminal having the minimum transmission rate (downward equalization). There is a problem).

The technical problem to be achieved by the present invention is to secure efficient quality of multiple services using the CSMA / CA medium access control method in the wireless LAN and to control the trade-off relationship between service quality and fairness It is to provide a bandwidth allocation method.

Wireless LAN terminal according to one feature 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; When the scheduling mode is a congestion control window based mode, a congestion control window value based on a data transmission rate, the proportional coefficient index and the fairness index, wherein the congestion control window value is the data transmission rate and queue waiting time or the data transmission rate and the service; A bandwidth setting unit that calculates inversely proportional to the weight to set a corresponding bandwidth; And a data transmitter for transmitting data to the access point according to the bandwidth set by the bandwidth setting unit.

Wireless LAN terminal according to another feature 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; When the scheduling mode is a frame length based mode, a frame length value based on a data rate, the proportionality index and the fairness index, wherein the frame length value is the data rate and queue latency or the data rate and the service; A bandwidth setting unit configured to calculate a value proportional to the weight and set a corresponding bandwidth; And a data transmitter for transmitting data to the access point according to the bandwidth set by the bandwidth setting unit.

Bandwidth allocation method according to another aspect of the present invention,

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; When the scheduling mode is a frame length based mode, a frame length value based on a data rate, the proportionality index and the fairness index, wherein the frame length value is the data rate and queue latency or the data rate and the service; Calculating a proportional to weight to set a corresponding bandwidth; And a congestion control window value based on a data transmission rate, the proportional coefficient index and a fairness index, wherein the congestion control window value is the data transmission rate and queue waiting time or the data transmission rate and the congestion control window value. Calculating inversely proportional to the service weight—to set the corresponding bandwidth.

According to the present invention, it is possible to ensure efficient quality in multiple services using the CSMA / CA medium access control method.

In addition, the trade-off relationship between overall yield and fairness can be adjusted.

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

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement 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 the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components 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 and a bandwidth allocation method using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a configuration of a WLAN wireless data network according to an embodiment of the present invention.

The term "terminal" described below is assumed to mean "wireless LAN 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 to the terminal 200 to perform synchronization and initialization with the terminal 200. Here, the beacon frame includes a parameter for bandwidth allocation in the terminal 200. Such parameters include service weight, fairness index, and scheduling mode. Here, the service weights are indices used to determine a congestion coefficient for determining a congestion control window (CW) value and a transmission frame length (TL) value assigned to the terminal 200, and the fairness index is an average yield of the terminal 200. As an index for varying the trade-off relationship between fairness and overall yield maximization, this fairness index is also used to determine CW and TL values. The scheduling mode will be described in detail with reference to FIG. 3.

Accordingly, the AP 100 may change a parameter used to determine the bandwidth allocated to the terminal 200.

The plurality of terminals 200 receives a parameter for bandwidth allocation from the AP 100 through a beacon frame, calculates a CW value or a TL value, and calculates data according to the allocated bandwidth based on the calculated CW value or TL value. Transmit 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 at a predetermined number of times (for example, 10 times) at the aforementioned transmission rate, and then receives a response signal ACK from the AP 100 a predetermined number of times. After determining that the channel environment is good, the data transmission rate is increased by one step and transmitted to the AP 100.

On the contrary, if each terminal 200 transmits data to the AP 100 at a predetermined number of times (for example, twice) at a transmission rate, and then fails to receive a response signal ACK from the AP 100 for a predetermined number of times. In this case, it is determined that the channel environment is bad and the transmission speed is lowered by one step and transmitted to the AP 100. For example, each terminal 200 can be set to a transmission speed of 1 Mbps, 2.2 Mbps, 5 Mbps, 11 Mbps, and 10 times the response signal from the AP 100 after transmitting 1 Mbps data to the AP 100 Received will send the next data at 2.2Mbps. The transmission rate in this example is for expressing an embodiment of the present invention, and may be variously set according to the wireless data network.

Next, the terminal 200 illustrated in FIG. 2 will be described in detail with reference to FIG. 3.

3 is a block diagram schematically illustrating a configuration of the terminal 200 illustrated in FIG. 2.

As shown in FIG. 3, the terminal 200 includes a storage 210, a parameter processor 220, a bandwidth setting unit 230, and a data transmitter 240.

The storage unit 210 stores various data, program files, etc. required by the terminal 200, and particularly, parameters necessary for bandwidth allocation according to an embodiment of the present invention, and CW values set according to an embodiment of the present invention. , TL value and so on.

The parameter processor 220 receives the beacon frame from the AP 100, extracts a parameter included in the received beacon frame, that is, a service weight, fairness index, and scheduling mode (CW-based mode or TL-based mode) and stores the storage unit ( 210).

In the WLAN, each terminal 200 has a CW-based mode for adjusting the size of 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 by the parameter processing unit 220 through the beacon frame, calculates a CW value or TL value, and based on the calculated CW value or TL value. Set the bandwidth. At this time, the bandwidth setting unit 230 calculates a CW value or TL value based on the priority and fairness index for each service determined by the service weight. Specific details will be described later.

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

4 is a detailed block diagram of the bandwidth setting unit 230 shown in FIG. 3.

As 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 type of service for each connection (eg, real time service, non real time service, best real time service, etc.) serviced by the terminal 200.

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

)는 서비스별로 다음과 같이 계산된다.Proportional coefficient for k connections in t bandwidth allocation period (

) Is calculated for each service as

)가 계산된다.First, when the k-th connection is a real-time service, the proportional coefficient ([Equation 1] below)

) 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 rate that the terminal 200 can transmit to the AP 100,

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

to be. here,

Is

Is the maximum allowed queue wait time for k connections,

Is the guard time for queue wait time.

The queue wait time is the maximum wait time to satisfy the goal of

Not

Former

In case of exceeding the above, priority measures were taken to satisfy the service quality. And,

Is the maximum queue wait time, which is the maximum wait time of any packet in the connected queue of the service class.

The range of

The goal is to stay.

인 것은 k번째 연결에 대해

가 목표 유지범위 내에 있음을 의미하며 실시간 서비스의 우선순위 계수인

보다 작아지도록 한다.Therefore, in [Equation 1] described above

Is for the kth connection

Is within the target retention range, which is a priority factor for real-time services.

Make it smaller.

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 kth connection

Means out of range, so the priority factor for real-time services is

To be greater than At this time, the priority count for each connection is

The greater is the excess index

And the transmission state of the terminal 200

Is the product of

.

)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 Equation 1, the proportional coefficient (

In order to calculate), the proportional coefficient calculator 232 receives the service weight from the parameter processor 220. At this time, the service weight is the excess index described above.

And priority coefficients for real-time services

Included.

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.For kth connection in [Equation 1]

Is within the target holding range,

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

Priority factor

Multiply by

Multiply by

When

Is greater than 1 and its value is

Becomes smaller and becomes larger, conversely

Becomes small, and as a result, the proportional coefficient (

), Which results in a smaller TL value, which reduces the packet length

This large connection allows more channels.

일 때는, 이미 목표 유지범위를 벗어남으로 인해,

을 곱하지 않고,

일 때의 최대값인

보다 크게 되도록 한다. Meanwhile,

When is already out of the target maintenance range,

Without multiplying by

Is the maximum value when

Make it larger.

의 값을 더해주도록 한다.Also, if there are several services that are outside of the target retention range, make sure that the channel gives more channel time to a good connection among those urgent services.

Let's add 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,

Is the maximum value

Because of

The value is between 0 and 1

The division of the values is just to satisfy this property of less than one,

Multiply by to get efficiency by having a better channel give a good connection more channel time.

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

) Is calculated.

[Equation 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 service. And, reflecting the importance between service classes

Priority coefficients for each service are set.

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

)을 계산하여 데이터 전송을 위한 TL 대역폭을 설정한다.When the scheduling mode received from the AP 100 by the parameter processing unit 220 is a TL-based mode, the TL setting unit 233 uses the TL value for the k-th connection according to Equation 3 below.

) 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 the 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 proportional coefficient and the fairness index for each service of the k-th connection. In addition, the length of the TL has a larger value as the priority of the service importance and the channel state becomes better, and the yield of the channel is increased by using the channel a lot.

)을 계산하여 데이터 전송을 위한 CW 대역폭을 설정한다.When the scheduling mode received from the AP 100 by the parameter processing unit 220 is a CW-based mode, the CW setting unit 234 may use the CW value for the k th connection according to Equation 4 below.

) 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,

Is the maximum data rate at the terminal 200

Indicates the CW value when

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

Is the 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 service of the k-th connection. In addition, the size of the CW has a smaller value as the priority of the service importance and the channel state becomes better, and the yield of the channel increases 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. 5.

First, the parameter processing unit 220 of the terminal 200 receives a beacon frame from the AP 100, and calculates a service weight (excess index, priority coefficient for each service), fairness index, and scheduling mode included in the received beacon frame. Extract and store in the storage 210 (S100).

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

Thereafter, when the scheduling mode is the TL-based mode, the TL setting unit 233 uses the above-described Equation 3 based on the proportional coefficient and the fairness index calculated by the proportional coefficient calculating unit 232. To calculate the bandwidth is set (S120).

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

Subsequently, the data transmitter 240 transmits data to the AP 100 by applying the bandwidth set in the steps S120 and S130 to the CSMA / CA protocol (S140).

Meanwhile, after receiving the data transmitted from the terminal 200, the AP 100 adjusts a scheduling method (scheduling mode) and service weights to adjust the trade-off relationship between the overall yield and fairness of the terminal 200 as necessary. You can change it. Since the changed parameters are transmitted through the beacon frame from the AP 100, the terminal 200 receives the beacon frame in the beacon frame receiving step (S100) and sets the corresponding bandwidth according to the changed parameters to set the data. It is possible to transmit to the AP (100).

6 is a view showing a trade-off relationship between the overall yield and fairness of the terminal 200 according to an embodiment of the present invention.

In order to adjust the trade-off relationship between overall yield and fairness, the AP 100 changes a parameter including a scheduling mode, a service weight, and a fairness index, and periodically loads the changed information in a beacon frame to the terminal 200.

The terminal 200 receives a new scheduling mode and a parameter from the AP 100, calculates a CW value or a TL value, and sets a corresponding bandwidth.

< 1인 경우, 1보다 큰 배수의 CW값 또는 TL값으로 증감한다. At this time, as shown in [Equation 3] and [Equation 4], the fairness index is

In the case of <1, the value is increased or decreased by a CW value or a TL value of a multiple of 1 or more.

In this case, the terminal 200 has a lower average yield in the case of the low speed terminal 200, and the average yield in the case of the high speed terminal 200 further increases. Here, the high speed terminal 200 and the low speed terminal 200 are determined as the high speed terminal 200 when the speed is higher than the reference data transmission rate in proportion to the data transmission speed, and the low speed terminal 200 when the speed is small.

In other words, when the fairness index is smaller than the reference value, the terminal 200 increases the overall yield of the terminal 200 and decreases the fairness of the terminal 200.

> 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.In contrast, the scheduling index

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

In other words, when the fairness index is greater than the reference value, the terminal 200 decreases the overall yield of the terminal 200 and increases the fairness of the terminal 200.

As a result, the fairness index means that the resource is allocated to the high speed terminal 200 when it is smaller than the reference value based on the reference value, and the resource is further allocated to the low speed terminal 200 when it is larger than the reference value. 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 network resources by setting the fairness index in consideration of the network resource environment and the data transmission speed of the terminal 200.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

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;
When the scheduling mode is a congestion control window based mode, a congestion control window value based on a data transmission rate, the proportional coefficient index and the fairness index, wherein the congestion control window value is the data transmission rate and queue waiting time or the data transmission rate and the service; A bandwidth setting unit that calculates inversely proportional to the weight to set a corresponding bandwidth; And
Data transmission unit for transmitting data to the access point according to the bandwidth set by the bandwidth setting unit
WLAN terminal comprising a. The method of claim 1,
The bandwidth setting unit,
A service determination unit determining a type of service for each connection serviced by the WLAN terminal;
A proportional coefficient calculator configured to calculate a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and a service weight received from the parameter processor according to the type of service determined by the service determination unit; And
A congestion control window setting unit for setting a corresponding bandwidth by calculating the congestion control window value using the fairness index received from the parameter processing unit and the proportional coefficient calculated by the proportional coefficient calculating unit.
WLAN terminal comprising a. 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;
When the scheduling mode is a frame length based mode, a frame length value based on a data rate, the proportionality index and the fairness index, wherein the frame length value is the data rate and queue latency or the data rate and the service; A bandwidth setting unit configured to calculate a value proportional to the weight and set a corresponding bandwidth; And
Data transmission unit for transmitting data to the access point according to the bandwidth set by the bandwidth setting unit
WLAN terminal comprising a. The method of claim 3,
The bandwidth setting unit,
A service determination unit determining a type of service for each connection serviced by the WLAN terminal;
A proportional coefficient calculator configured to calculate a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and a service weight received from the parameter processor according to the type of service determined by the service determination unit; And
A frame length setting unit that calculates the frame length value using the fairness index received from the parameter processing unit and the proportional coefficient calculated by the proportional coefficient calculating unit to set a corresponding bandwidth;
WLAN terminal comprising a. The method according to claim 1 or 3,
The proportional coefficient calculating unit is proportional to the queue waiting time and the data transmission speed when the queue waiting time is within a preset target maintenance range when the service type of the connection determined by the service determining unit is a real time service. And setting the proportional coefficient to be proportional to an excess exponent which is one of the data transmission rate and the service weight when the queue waiting time is out of the target maintenance range. The method of claim 5,
When the service type of the connection determined by the service determining unit is a real-time service, and the queue waiting time is within a preset target maintenance range, the proportional coefficient calculating unit is a real-time priority having one of the service weights. Wireless LAN terminal, characterized in that the setting so that the rank coefficient. The method according to claim 2 or 4,
If the service type of the connection determined by the service determining unit is a best effort service, the proportional coefficient calculating unit is proportional to a product of the best priority coefficient, which is one of the data transmission rate and the service weight. WLAN terminal, characterized in that set to. The method of claim 2,
The congestion control window setting unit sets the congestion control window value such that when the fairness index is smaller than a reference value, the overall yield of the terminal increases and the fairness of the terminal decreases.
When the fairness index is larger than a reference value, the congestion control window value is set to reduce the overall yield of the terminal and increase the fairness of the terminal.
WLAN terminal, characterized in that. The method of claim 4, wherein
When the fairness index is smaller than a reference value, the frame length setting unit sets the frame length value so that the overall yield of the terminal increases and the fairness of the terminal decreases.
When the fairness index is larger than a reference value, the frame length value is set to reduce the overall yield of the terminal and increase the fairness of the terminal.
WLAN terminal, characterized in that. 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;
When the scheduling mode is a frame length based mode, a frame length value based on a data rate, the proportionality index and the fairness index, wherein the frame length value is the data rate and queue latency or the data rate and the service; Calculating a proportional to weight to set a corresponding bandwidth; And
When the scheduling mode is a congestion control window based mode, a congestion control window value based on a data transmission rate, the proportional coefficient index and the fairness index, wherein the congestion control window value is the data transmission rate and queue waiting time or the data transmission rate and the service; Calculating inversely proportional to weight—to set the corresponding bandwidth
Bandwidth allocation method comprising a. The method of claim 10,
The step of setting the corresponding bandwidth by calculating the frame length value,
Determining a type of service for each connection serviced by the WLAN terminal;
Calculating a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and a service weight according to the type of service for each connection determined; And
Calculating the frame length value using the fairness index and the proportional coefficient to set a corresponding bandwidth;
Bandwidth allocation method comprising a. The method of claim 10,
The setting of the corresponding bandwidth by calculating the congestion control window value,
Determining a type of service for each connection serviced by the WLAN terminal;
Calculating a proportional coefficient for the connection using the data transmission rate, the queue waiting time, and a service weight according to the type of service for each connection determined; And
Calculating a congestion control window value using the fairness index and the proportional coefficient to set a corresponding bandwidth;
Bandwidth allocation method comprising a. The method according to claim 11 or 12, wherein
In calculating the proportional coefficients,
The proportional coefficient (

) Is the following relation when the type of 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 rate that the terminal can transmit to the access point,

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

,

ego,

Is the maximum allowed queue wait time for k connections,

Is the guard time for the queue wait time,

Is the queue maximum wait time,

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

) Is the following relation when the type of service is the best service

here,

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

Is set to satisfy
The bandwidth allocation method, characterized in that calculated according to. The method of claim 14,
In setting the bandwidth,
The frame length value (

) Is the relation

here,

Is the default frame length value,

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

) Is the relation

here,

Is a maximum rate in the terminal

Indicates the congestion control window value when

Is the above fairness index
The bandwidth allocation method, characterized in that calculated according to.

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