KR101171630B1 - Intelligent interference avoidance method and apparatus for mobile service set - Google Patents

Abstract

PURPOSE: An intelligent interference avoidance method for a mobile service cell and an apparatus thereof are provided to intelligently use other channels within a range where a mobile terminal is able to control channels. CONSTITUTION: When a contention section(906,910) exists, a mobile terminal confirms a channel share frame. When a channel occupation frame is not received from a specific access point(AP), the mobile terminal searches for an AP using a Wi-Fi network(912,914). If the AP found in the search does not correspond to an AP existing in a channel C, the mobile terminal switches from a current channel to a next channel(916,918).

Description

Intelligent interference avoidance method and apparatus for mobile service set

The present invention relates to a wireless LAN system for a vehicle, and relates to an apparatus and a method for performing intelligent interference avoidance through competition between basic service sets (BSS).

Currently, the wireless terminal for WiMAX / Wibro has a problem that the communication quality is deteriorated due to the deterioration of the signal sensitivity at the cell boundary and the shadow area. In order to solve these problems, many researches are being conducted. These studies aim to improve the communication quality by increasing the signal reception sensitivity using the internal antenna for WiMAX / Wibro. Here, the user terminal receives high quality WiMAX / Wibro service through an internal antenna and a WiFi interface. However, when a large number of vehicles are concentrated, the communication efficiency is expected to decrease due to interference between WiFi networks.

As described above, the present invention provides a device for avoiding interference between mobile BSSs for providing a Wifi service in a vehicle by mounting a built-in antenna of a mobile vehicle to use the services such as WiMAX / Wibro in an optimized communication environment. And methods.

According to an embodiment of the present invention, the method may further include obtaining a priority according to a traffic vector and a traffic amount of a vehicle including an AP connecting at least one mobile terminal, and determining whether a channel occupied frame is present according to the priority. And if the channel occupancy frame does not exist, calculating a network throughput according to a moving parameter, and performing the channel occupancy mode in a contention mode or a avoidance mode according to the operation result.

The performing of the channel mode may include transmitting a corresponding channel frame to a mobile terminal when the channel occupancy frame exists, and transmitting data through the channel when receiving an ACK signal from the mobile terminal. .

In the channel occupancy mode, the data throughput rate in the contention mode and the data throughput rate in the switching mode may be calculated, respectively, and the channel gain mode may be performed as the channel occupation mode.

)은

의 수학식을 적용하여 산출된다. -상기 E[T_F]는 단독채널 점유 시간이며, T_D는 데이터 전송시간임-Data throughput of the switching mode (

)silver

It is calculated by applying the following equation. E [T _F ] is a single channel occupation time, and T _D is a data transmission time.

_c)은 아래의 수학식에 의해 산출될 수 있다. The data throughput of the contention mode (

_c ) may be calculated by the following equation.

는 AP자신의 트래픽 양과 채널을 점유한 AP의 트래픽 양의 합임The T _A is a time point out of the interference distance range with the occupied AP in the channel, T _S is a superframe period, T _C is a contention mode interval,

Is the sum of the AP's own traffic and the AP's traffic

The channel occupancy mode may perform a contention mode when the sum of the traffic amount according to the connected mobile device and the traffic amount of the AP occupying the channel is less than or equal to the maximum traffic amount.

The movement parameter may be a distance between the vehicle including the AP and the vehicle including the AP using the same channel calculated in the direction and the distance traveled after a predetermined time.

The separation distance between the vehicles may be calculated by applying the following equation.

는 차량 i의 위치정보의 좌표이며, 상기

는 차량j의 위치정보 좌표이며,

는 차량 i의 방향벡터이며,

는 차량 j의 이동벡터임--remind

Is the coordinate of the location information of the vehicle i,

Is the location coordinate of vehicle j,

Is the direction vector of vehicle i,

Is the moving vector of vehicle j

In addition, the method according to an embodiment of the present invention comprises the steps of checking whether the AP connected to the communication exists in the competition section; Confirming whether a channel occupied frame is received during the contention period, if the content is present in the contention period; If the channel occupation frame is received, transmitting data through a corresponding channel.

Searching for an AP through a WLAN if the channel occupation frame is not received; Determining whether the found AP exists in a reference channel; As a result of the determination, if the found AP exists in the reference channel, the method may include transmitting data through the corresponding channel.

In addition, an apparatus according to an embodiment of the present invention includes a communication unit for connecting at least one mobile terminal; And a control unit for acquiring a priority according to the traffic amount of the mobile terminal connected to the communication unit, collecting movement parameters of the vehicle, and controlling a channel occupancy mode in a competition mode or avoidance mode according to the priority or movement parameters. .

The controller may compare the traffic amount of at least one mobile terminal connected to the communication unit with the traffic amount of the mobile terminal connected to the AP using the same channel to obtain priority in the order of the upper traffic amount.

 The controller may calculate the data throughput in the contention mode and the data throughput in the switching mode to control the channel gain mode to be performed in the channel occupancy mode.

The controller may control to perform a contention mode when the sum of the traffic amount according to the connected mobile device and the traffic amount of the AP occupying the channel is less than or equal to the maximum traffic amount.

The control unit obtains a movement parameter based on a distance at which the vehicle including the AP moves after a predetermined time and a distance from the vehicle including the AP using the same channel calculated in the direction.

In addition, an apparatus according to an embodiment of the present invention connects at least one mobile terminal, obtains a priority according to the traffic amount of the mobile terminal, collects a moving parameter of the vehicle, and competes according to the priority or parameter. Or an AP controlling the channel occupation mode in the avoidance mode; And a mobile terminal connected to the AP and transmitting and receiving data for a predetermined time through a corresponding channel according to the presence of a channel occupancy frame received from the AP in a contention period.

The AP may obtain a priority according to the traffic amount of the mobile terminal.

The AP may calculate a data throughput rate in the contention mode and a data throughput rate in the switching mode, and perform the mode in which the gain of the throughput is higher as the channel occupancy mode.

As described above, the present invention can avoid interference by using different channels intelligently within the interferenceable range in the mobile mobile terminal.

1 is a diagram illustrating a section interference topology between vehicles using the same channel according to an exemplary embodiment of the present invention.
2 is an exemplary view of a vehicle equipped with an antenna to which an embodiment of the present invention is applied.
3 is a configuration diagram of an AP to which an embodiment of the present invention is applied.
4 is a diagram illustrating a structure of a superframe according to an embodiment of the present invention.
5 is an exemplary diagram of a priority competition section according to an embodiment of the present invention.
6 is an exemplary channel synchronization diagram according to an embodiment of the present invention.
7 illustrates an example of channel usage in a competition section according to an embodiment of the present invention.
8 is a flowchart illustrating an interference avoiding operation of an AP according to an embodiment of the present invention.
9 is a flowchart illustrating an interference avoiding operation of a mobile terminal according to an exemplary embodiment of the present invention.

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

1 is a diagram illustrating an interference section topology between vehicles using the same channel according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the network configuration changes frequently because vehicles on the road are very mobile. Therefore, the interference topology between BSSs frequently changes. When there are a plurality of vehicles traveling in the same direction, the interference interval between the BSSs becomes long. According to an embodiment of the present invention, priorities of APs of the vehicle are determined, and the channels are occupied according to the priorities. In the example shown in FIG. 1, each of the BSS # 1, # 2, and # 3 may include at least one AP and a plurality of terminals.

If there are APs of a vehicle having the same priority, any one AP may occupy a channel through periodic channel occupancy competition.

2 is an exemplary view of a vehicle to which an embodiment of the present invention is applied.

Referring to FIG. 2, a vehicle to which an embodiment of the present invention is applied includes a mobile device as a WiMAX terminal node.

WLAN (Wifi) in the vehicle synchronizes via WiMAX / Wibro connected to the gateway. In addition, a motion parameter including location information and a velocity vector can be obtained from the navigation in the vehicle.

Position information of the vehicle (l _i) is the Y coordinate of the X-coordinate of α _i and _{β i (α i, β i} ) in the form of It can be represented as a two-dimensional vector.

The motion vector of the vehicle may also be represented by a two-dimensional vector. For example, the motion vector m _i of AP _i ^C , which is an AP that uses the i-th channel C, may be represented as (γ _i , δ _i ).

3 is a block diagram of an AP according to an embodiment of the present invention.

Referring to FIG. 3, an AP according to an exemplary embodiment of the present invention includes a communication unit 110 and a control unit 120. The AP shown in FIG. 3 may be an intelligent interference avoiding device according to an embodiment of the present invention.

The communication unit 110 connects at least one mobile terminal or a fixed terminal. That is, the communication unit 110 may transmit and receive data with the terminals in the vehicle.

The controller 120 may obtain the priority according to the traffic amount of the mobile terminal connected to the communication unit 110. The priority may be determined by the amount of traffic generated according to an operation mode of each of the mobile terminals connected through the communication unit 110. The control unit 120 gives a higher priority as the traffic amount increases.

The controller 120 collects moving parameters such as a speed, a moving direction, and a moving distance of the vehicle through a device such as a navigation in the vehicle. The controller 120 controls to select and operate a mode for occupying the data transmission channel according to the obtained priority and the moving parameter.

4 is a diagram illustrating a structure of a superframe according to an embodiment of the present invention.

Referring to FIG. 4, a superframe includes a contention section and a data transmission section for each channel. Competition section is divided into competition section and tiebreaking contention phase. The data transmission section is represented by T _{D, and the} contention section is represented by T _C.

The total length of the superframe is denoted by T _S. In the priority competition period, the AP attempts to occupy a channel frame to transmit data. The AP waits for a Contention Window (CW) corresponding to its priority and then transmits data in the data transmission section (T _D ).

The AP enables the mobile terminal to transmit and receive data through the occupied channel and receives an ACK signal upon completion of data transmission through the mobile terminal.

5 is an exemplary diagram of a priority competition section according to an embodiment of the present invention.

The AP sets a contention window (CW) according to its priority level.

For example, as shown in FIG. 5, when vehicle A has priority level 4 (CW = 4) and vehicle B has priority level 6 (CW = 6), vehicle A has a high priority, thus occupying transmission frame of B. Faster than Therefore, the vehicle B stops the frame occupation operation in accordance with the frame occupation of the vehicle A.

Table 1 below is an exemplary table showing the priority level according to the traffic amount of the AP.

Priority Traffic amount One 4.5Mbps or more 2 4.0 to 4.5 Mbps 3 3.5 to 4.0 Mbps 4 3.0 to 3.5 Mbps 5 2.5 to 3.0 Mbps 6 2.0 to 2.5 Mbps 7 1.5 to 2.0 Mbps 8 1.5Mbps or less

In the example of Table 1, when the number of priority levels is eight, the priority level according to the traffic amount is shown. As described above, the APs may store information on a preset priority level according to the amount of traffic in the BSS.

6 is an exemplary channel synchronization diagram according to an embodiment of the present invention.

Referring to FIG. 6, the AP and the mobile terminal are synchronized through a Wibro / WiMAX device connected to the AP, and follow the structure of FIG. 6.

T _superframe refers to the length of the entire _superframe , and Tc is defined as the total length of the competition section. Each channel of the superframe structure as shown in FIG. 6 is synchronized. The superframe is configured such that the contention section of the next channel 1 starts immediately after θ time after the contention section of channel 0. Therefore, the BSS group that competed in channel 0 repeats the dispute in channel 1 immediately after θ time. Through repeated competition, the channel increases usability. The BSS group occupying the channel transmits data for T _D time and repeats the competition when the T _C interval is reached.

7 illustrates an example of channel usage in a competition section according to an embodiment of the present invention.

Referring to FIG. 7, as a criterion for determining a competition mode and an avoidance mode according to an embodiment of the present invention, the competition group and the avoidance group are divided in consideration of a vehicle's mobility vector and traffic volume.

The competition group uses the same channel as the occupied BSS or. If interference is very small due to the direction or speed difference, or if the amount of traffic in the BSS is small, coexistence in the channel is possible.

The competition mode is determined when the following conditions are satisfied.

First, when the traffic transmission of the occupied BSS is corrected, the sum of the traffic amount (TRF _my ) of the BSS and the traffic amount (TRF _occupancy ) of the BSS occupied the channel should be less than or equal to the maximum traffic amount.

Condition1: TRF _my + TRF _occupancy ≤ MAX_Traffic

Secondly, if the expected channel occupancy time has more channel gains than the expected interference termination time, it operates in a contention mode.

Condition2:

는 AP_i ^c의 통신범위 내에서 채널 i를 사용하는 APs의 set을 나타낸다.

Denotes a set of APs using channel i within a communication range of AP _i ^c .

In Condition2, AP _i ^c continuously measures its traffic volume and distributes the traffic volume of AP _i ^c to channel occupied frames. That is, Equation 1 performs the competition mode when the maximum traffic amount is less than or equal to the sum of the traffic amount of its BSS using channel i and the amount of BSS occupying the channel.

은 네트워크 처리율(또는 최대 대역폭)로써, 스위칭 모드의 기대 처리율(

)는 상기 네트워크 처리율(

)의 일부를 차지한다. 실제 데이터 전송률은 하기의 [수학식 2]와 같이 나타낼 수 있다.

Is the network throughput (or maximum bandwidth), which is the expected throughput for the switching mode (

) Is the network throughput (

Occupy part of The actual data rate can be expressed as Equation 2 below.

T _F Is the time when the leader AP can start data transmission as the leader AP from the continuation of the competition interval for searching for the next channel to AP _i ^c time. That is, T _F can be considered as a search time to be a leader AP.

The T _F may be calculated by Equation 3 below.

은

에 의해 산출될 수 있다.

는 우선순위 레벨의 수이다. 즉, 상기 산출된

을 이용하여 상기 [수학식 3]은

가 된다. In [Equation 3] above

silver

Can be calculated by

Is the number of priority levels. That is, the calculated

[Equation 3] using

Becomes

Therefore, the expected throughput of AP _i ^c in the competition mode may be calculated by Equation 4 below.

T _A is the time until no interference occurs as the leader AP deviates from AP _i ^c . If T _A is greater than or equal to T _S , AP _i ^c moves to channel C when the leader AP ends in superframe, and AP _i ^c uses channel C until the end of the superframe. However, if T _A is less than T _S , the leader AP uses channel C from the interference range of AP _i ^{c to} the point of departure of the leader AP. AP _i ^c uses channel C until the end of the superframe.

는

에 의하여 지속적으로 측정된다. 그리고

는 채널 점유 프레임으로 이동한다.

The

Is measured continuously. And

Moves to the channel occupied frame.

와 위치정보

를 사용하여 산출한다. t시간 후에 AP_i ^c 위치는

이고, AP_j ^c의 위치는

이다. 그러므로, t시간 후에 AP_i ^c 와 AP_j ^c의 거리를 산출할 수 있다.T _A is the direction vector of AP _i ^c and denoted by AP _j ^c

And location information

Calculate using After t hours, the AP _i ^c position is

And the position of AP _j ^c is

to be. Therefore, the distance between AP _i ^c and AP _j ^c can be calculated after t hours.

와

사이의 거리를 산출한다. 예를 들어, 리더 AP가 멀어지면(

로부터 간섭 범위를 벗어나면)

와

의 거리는 멀어지게 된다. d_t는

와

가 간섭을 받지 않는 임계거리이다. Based on motion vector

Wow

Calculate the distance between. For example, if the leader AP is far away (

Outside of the interference range)

Wow

The distance is farther away. d _t is

Wow

Is the critical distance that is not affected.

Therefore, T _A is calculated by Equation 7 below.

Values in Equation 7 are given constant values except d _t . In addition, when d _t is the interference possible distance, it is assumed that the interference possible distance after t time does not cause interference after t time.

8 is a flowchart illustrating an interference avoiding operation of an AP according to an embodiment of the present invention.

An interference avoiding operation of the AP using the above-described equation will be described with reference to FIG. 8.

는 802단계에서 턴온(Turnon)되면 804단계에서 상기

는 WiMAX슈퍼 프레임 영역에서 동기화된다.

는 806단계에서 점유채널 c에서 이동 감지 간섭 회피를 위한 동작을 수행하는지를 판단한다.

In step 802, if turned on in step 804,

Is synchronized in the WiMAX super frame region.

In step 806, it is determined whether to perform an operation for avoiding movement sensing interference in the occupying channel c.

는 판단결과 경쟁구간 상에 존재하지 않으면, 808단계에서 경쟁 구간 시작 전까지 대기모드를 수행하게 된다. 반면

가 경쟁구간 상에 존재하게 되면 810단계에서

에 등록된 모바일 단말기의 트래픽 양에 따른 우선순위를 결정하게 된다. 이때, 모바일 단말기의 트래픽 양은 BSS내 전체 트래픽 양일 수도 이고, 모바일 단말기들 중 가장 많은 양의 트래픽 양이거나, 음성 또는 데이터 송수신 등과 같이 동작 모드에 따라 정해진 트래픽 양일 수도 있다. 즉, 모바일 단말기의 트래픽 양은 구현 형태에 따라 다양한 기준으로 결정될 수 있는 값이다.

If the determination result is not present in the competition section, the standby mode is performed until the competition section starts in step 808. On the other hand

Is present in the competition section, in step 810

The priority is determined according to the traffic amount of the mobile terminal registered in. In this case, the traffic amount of the mobile terminal may be the total traffic amount in the BSS, the traffic amount of the largest amount of the mobile terminals, or may be a traffic amount determined according to an operation mode such as voice or data transmission and reception. That is, the traffic amount of the mobile terminal is a value that can be determined on a variety of criteria depending on the implementation form.

는 812단계에서 우선순위에 따른 CW(contention Window)가 결정되고, 우선순위에 따른 CW에 따라

는 채널 점유를 수행하게 된다.

In step 812, a contention window (CW) is determined according to the priority, and according to the CW according to the priority

Will perform channel occupancy.

는 CW동안 채널 점유 프레임이 존재하는지의 여부를 814단계에서 판단한다.

는 상기 814단계의 판단결과에 따라 채널 점유 프레임이 존재하면, 해당 채널 점유 프레임을 834단계에서 전송한다. 836단계에서 ACK신호의 수신 여부를 판단하고, 상기 ACK신호가 수신되지 않으면 상기 전송된 채널 점유 프레임이 우선 순위 경쟁 구간에 포함되는지를 838단계에서 판단한다.

In step 814, it is determined whether a channel occupation frame exists during CW.

If there is a channel occupation frame according to the determination result of step 814, the corresponding channel occupation frame is transmitted in step 834. In step 836, it is determined whether an ACK signal is received, and in step 838, if the ACK signal is not received, whether the transmitted channel occupation frame is included in a priority contention period.

는 우선순위 경쟁 구간에 포함되는 경우 비경쟁구간이 시작될 때까지 840단계에서 대기모드로 동작하고 842단계에서 CW를 무작위로 설정한다. 상기 무작위로 설정된 CW에 따라 채널 점유 프레임이 존재하는지의 여부를 판단하는 814단계로 돌아간다.

If it is included in the priority competition section, the operation operates in the standby mode in step 840 until the non-competition section starts and randomly sets the CW in step 842. In step 814, it is determined whether a channel occupation frame exists according to the randomly set CW.

는 연결된 모바일 단말기에 대한 트래픽 볼륨(λ_k) 을 업데이트한다. 이후 818단계에서 최대 트래픽 양이 자신의 BSS의 트래픽 양과 해당 채널을 점유한 BSS의 트래픽 양의 합을 초과하면 (

)이면

는 이동 파라미터인

를 업데이트하고 822단계에서 E[T_F], T_A,

,

을 연산한다. On the other hand, if there is no channel occupied frame during CW in step 814, in step 816

Updates the traffic volume λ _k for the connected mobile terminal. If the maximum traffic amount exceeds the sum of the traffic volume of the BSS and the traffic volume of the BSS occupying the corresponding channel in step 818 (

)

Is a moving parameter

And update to E [T _F ], T _A ,

,

Calculate

이면,

는 826단계에서 경쟁모드를 선택하고, 828단계에서 T_D동안 채널 C를 통하여 데이털ㄹ 전송하게 된다. In step 824

If so,

In step 826, the competition mode is selected, and in step 828, data is transmitted through the channel C during T _D.

의 조건이 충족되지 않으면

는 스위칭 모드로 830단계에서 전환하여 832단계에서 채널을 스위칭하게 된다. Whereas in step 824

If the conditions in are not met

In operation 830, the switch mode switches to the switching mode.

9 is a flowchart illustrating an interference avoiding operation of a mobile terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 9, when the mobile terminal approaches the AP with the power turned on in step 902, the mobile terminal performs synchronization in the superframe section of WiMAX in step 904.

When the synchronization is completed, the mobile terminal determines whether it is a competition section in step 906. If it is determined that the competition section is not in operation 908, the operation mode is operated until the competition section starts.

On the other hand, in the case of a competition section, the mobile terminal checks the channel occupied frame in step 910. In step 912, the mobile terminal determines whether there is a channel occupation frame received from the AP during the contention period.

If the mobile terminal does not receive the channel occupancy frame from the specific AP, the mobile terminal searches for the AP through Wifi in step 914.

When the AP is found in step 914, the mobile terminal determines whether it exists in channel C (reference channel) in step 916. As a result of the determination, if the searched AP exists in channel C, data is transmitted through channel C during T _{D in} step 920.

On the other hand, if the AP found in step 914 is not an AP existing in channel C, the mobile terminal switches to the next channel in step 918.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

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

Claims (18)

Obtaining a priority according to a traffic vector and a traffic amount of a vehicle including an AP connecting at least one mobile device;
Determining whether a channel occupation frame exists according to the priority;
Calculating a network throughput rate according to a movement parameter if the channel occupation frame does not exist;
Performing a channel occupation mode in a contention mode or an avoidance mode according to the operation result;
Intelligent interference avoidance method comprising a. The method of claim 1,
Transmitting the channel frame to the mobile terminal when the channel occupation frame exists;
When receiving an ACK signal from the mobile terminal, transmitting data through the channel;
Intelligent interference avoidance method comprising a. The method of claim 1,
Performing the channel occupancy mode is
Computing the data throughput in the competitive mode and the data throughput in the switching mode, respectively, to perform a mode in which the gain of the throughput is higher than the channel occupancy mode.
Intelligent Interference Avoidance Method. The method of claim 3,
Data throughput of the switching mode (

)silver
Calculated by applying the following equation
Intelligent Interference Avoidance Method.

E [T _F ] is a single channel occupation time, and T _D is a data transmission time. The method of claim 3,
The data throughput of the contention mode (

_c ) is
Calculated by applying the following equation
Intelligent Interference Avoidance Method.

_- wherein T _A is the time of leaving the AP occupies the interference distance range in the channel, T _S is a super-frame period, T _C is a competition mode interval,

Is the sum of the AP's own traffic and the AP's traffic. The method of claim 1,
The channel occupancy mode is
If the sum of the traffic amount according to the connected mobile device and the traffic amount of the AP occupying the channel is less than the maximum traffic amount, the competition mode is performed.
Intelligent Interference Avoidance Method. The method of claim 1,
The moving parameter is
Distance between the vehicle including the AP including the AP using the same channel calculated in the direction and the distance traveled after a predetermined time the vehicle including the AP
Intelligent interference avoidance method characterized in that. The method of claim 7, wherein
The separation distance between the vehicles
Calculated by applying the following equation
Intelligent Interference Avoidance Method.

-remind

Is the coordinate of the location information of the vehicle i,

Is the location coordinate of vehicle j,

Is the direction vector of vehicle i and the movement vector of vehicle j Checking whether the AP to which the communication is connected exists in a contention period;
Confirming whether a channel occupied frame is received during the contention period, if the content is present in the contention period; And
If the channel occupation frame is received, transmitting data through a corresponding channel;
Intelligent Interference Avoidance Method. 10. The method of claim 9,
Searching for an AP through a WLAN if the channel occupation frame is not received;
Determining whether the found AP exists in a reference channel;
As a result of the determination, if the found AP exists in the reference channel, data is transmitted through the corresponding channel.
Intelligent Interference Avoidance Method. A communication unit connecting at least one mobile terminal; And
A controller for acquiring a priority according to the traffic amount of the mobile terminal connected to the communication unit, collecting movement parameters of the vehicle, and controlling a channel occupancy mode in a competition mode or avoidance mode according to the priority or movement parameters;
Intelligent interference avoidance device comprising a. The method of claim 11,
The control unit
Comparing the traffic amount of at least one mobile terminal connected to the communication unit with the traffic amount of the mobile terminal connected to the AP using the same channel to obtain priority in order of the upper traffic amount;
Intelligent Interference Avoidance Device. The method of claim 11,
The control unit
The data throughput in the competitive mode and the data throughput in the switching mode are calculated to control the mode in which the gain of the throughput is higher than that of the channel occupancy mode.
Intelligent Interference Avoidance Device. The method of claim 11,
The control unit
If the sum of the traffic amount according to the connected mobile device and the traffic amount of the AP occupying the channel is less than or equal to the maximum traffic amount, controlling to perform a contention mode
Intelligent Interference Avoidance Device. The method of claim 11,
The control unit
Obtaining a movement parameter by the distance from the vehicle including the AP using the same channel calculated in the distance and direction traveled by the vehicle including the AP after a predetermined time
Intelligent Interference Avoidance Device. Connecting at least one mobile terminal, acquiring a priority according to the traffic amount of the mobile terminal, collecting a moving parameter of the vehicle, and controlling a channel occupancy mode in a competition mode or avoidance mode according to the priority or parameter An AP; And
A mobile terminal connected to the AP and transmitting and receiving data for a predetermined time through a corresponding channel according to the presence of a channel occupancy frame received from the AP in a contention period. The method of claim 16,
The AP is
Obtaining priority according to the traffic amount of the mobile terminal;
Intelligent Interference Avoidance System. The method of claim 16,
The AP calculates the data throughput in the contention mode and the data throughput in the switching mode, and performs a mode in which the gain of the throughput is higher as the channel occupancy mode.
Intelligent Interference Avoidance System.

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