KR100740170B1 - Apparatus and method for coordinating interference between heterogeneous wireless communications - Google Patents

Abstract

An apparatus for coordinating interference among heterogeneous wireless communications is provided to make a WPAN(Wireless Personal Area Network) overcome interference by making an integrated communication apparatus actively determine an interference situation and select an interference escape scheme in a situation that a WLAN(Wireless Local Area Network) causes severe interference to the WPAN. An apparatus for coordinating interference among heterogeneous wireless communications comprises the first wireless communication module(210), the second wireless communication module(220), a coordinator(230), a system memory(250), a system bus(260) and a CPU(240). The first wireless communication module(210) conforms to the first communication standard. The second wireless communication module(220) conforms to the second communication standard which is different from the first communication standard. The coordinator(230) coordinates operation of the first and the second communication module(210,220), estimates a communication channel state, selects a scheme for escaping from interference between communication apparatuses and performs the selected scheme. The system memory(250) stores a program on an integrated communication apparatus. The system bus(260) is used as a path via which the first wireless communication module(210), the second wireless communication module(220) and the coordinator(230) transmit or receive information needed for interference escape operation. The CPU(240) controls the integrated communication apparatus via the system bus(260) and processes all the signals on the integrated communication apparatus.

Description

Apparatus and Method for Coordinating Interference between Heterogeneous Wireless Communications}

1 is a block diagram of an integrated communication device for operating the present invention.

2 illustrates a wireless network configuration according to an embodiment of the present invention.

3 is a flowchart of a wireless WPAN avoiding interference according to an embodiment of the present invention.

4 is a flowchart of Method 1 for identifying a state of a wireless WPAN according to an embodiment of the present invention.

5 is a flowchart of Method 2 for identifying a state of a wireless WPAN according to an embodiment of the present invention.

6 is a flowchart illustrating a method of finding a WLAN network causing the most severe interference to a WPAN according to an embodiment of the present invention.

FIG. 7 illustrates a time flow of an operation in which a start time of a WLAN channel secured by the integrated communication device according to an embodiment of the present invention exactly matches the start time of a WPAN beacon transmission.

8 illustrates a time flow of an operation in which a start time of a WLAN channel secured for configuring a WPAN by a unified communication device according to an embodiment of the present invention is before the start of WPAN beacon transmission.

9 shows an RTS control frame and a frame control field of an RTS frame according to an embodiment of the present invention.

FIG. 10 shows that the WLAN channel acquisition time and the WPAN beacon timing are synchronized when the time at which the transmission of the WLAN frame (a fragment) is completed is greater than the beacon period of the WPAN.

FIG. 11 shows that the WLAN channel acquisition time and the WPAN beacon timing are synchronized when the time at which the transmission of a WLAN frame (a fragment) is completed is smaller than the beacon period of the WPAN.

<Description of Symbols for Major Parts of Drawings>

110: integrated communication device 120: WPAN communication module

140: WLAN network 230: mediation device

240: central processing unit 250: system memory

260: system bus 251: operating system

252: program data 253: various application programs

254: device driver

The IEEE 802.11 network is currently the most used wireless communication LAN (WLAN) network. IEEE 802.11b / g wireless networks operate in the 2.4 GHz Industrial Scientific Medical (ISM) band, each capable of transmitting data at speeds up to 11/54 Mbps.

ISM band refers to a frequency band commonly used in the world of cutting-edge fields such as industry, science, and medicine. Since it is commonly used, it is used without paying a frequency fee separately.

Wireless LANs that can be easily accessed from around are also using this frequency band.

IEEE 802.11 is typically designed to service areas within 50 meters indoors and within 100 meters outdoors.

Recently, wireless personal area networks (WPANs), such as IEEE 802.15.1 bluetooth (hereinafter referred to as Bluetooth) and IEEE 802.15.4 Zigbee (hereinafter referred to as "Direct Service"), are rapidly spreading to service personalized network environments in addition to wireless LANs. In WPAN, one node is responsible for the central node function of configuring and managing the WPAN network. These nodes are often called PNC (Piconet Controller) in Bluetooth, and Master in Bluetooth.

Since both WLAN and WPAN devices use ISM bands that do not require the authority of the authorities, the spread of wireless devices has progressed very quickly. However, the common use of the ISM bands has caused serious interference between heterogeneous communication devices.

In the case of WLAN, the transmission power and bandwidth are much larger than that of the WPAN device, so if the frequencies used by the WLAN and the WPAN device overlap, the WPAN device is severely interrupted by the WLAN's transmission power and the communication state is severely degraded.

In the case of Bluetooth, the influence from WLAN is reduced by hopping while transmitting the frequency of several channels, while Zigbee uses a fixed frequency channel determined at the WPAN configuration stage, so WLAN that transmits the Zigbee transmission signal near If the signal overlaps with, most of the Zigbee signal may be damaged.

In particular, an integrated communication device in which a WLAN and a WPAN module exist together in one device may have a serious interference between communication modules unless it has a function of controlling interference.

The present invention for solving the above problems, when the integrated communication device having both the WPAN device and the WLAN device in the environment where the WLAN and WPAN overlap, the network situation of each of the WLAN and WPAN collect and aggregate the WPAN WLAN We propose a way to escape interference from the system.

For example, when the WPAN device is difficult to communicate due to interference of dense WLAN traffic, the unified communication device is an embodiment, which searches for a WLAN network that has the most interference with the WPAN, connects to the WLAN network, and accesses a WLAN channel. By acquiring time to quiet the WLAN channel causing severe interference to the WPAN, WPAN communication is enabled by transmitting WPAN data instead of the WL-AN frame at the acquired WLAN channel usage time.

At this time, since the interference received from the WLAN by the WLAN channel is temporarily removed by securing the WLAN channel license, the WPAN receives an important control frame such as sending and receiving a small amount of WPAN data frames or instructing each node of the WPAN to change the channel of the WPAN. It can be delivered to the WPAN communication module.

In order to achieve the above object will be described in detail with reference to the accompanying drawings an embodiment of the present invention.

Interference Avoidance Method between Heterogeneous Communication Networks using Unified Communications Device in the Environment of Heterogeneous Communication Networks in the Same Band

1 illustrates an example of a situation in which an integrated communication device operates in an environment in which heterogeneous communication networks overlapped by the present invention.

In FIG. 1, the integrated communication device 110 has a WLAN transceiver and a WPAN transceiver, and the WLAN communication module is a WLAN device, and the WPAN communication module is operating as a WPAN PNC (Piconet Coordinator).

Since the WPAN and WLAN operate in the 2.4 GHz frequency band, in this situation, the communication 130 between the WPAN communication module 120 and the integrated communication device 110 is severely interrupted by the signal 150 coming from the adjacent WLAN network 140. Can be received.

2 is a configuration diagram of an integrated communication device 200 in which a plurality of heterogeneous wireless communication modules proposed by the present invention are integrated.

As shown in FIG. 2, the integrated communication device includes a WLAN communication module 210, a WPAN communication module 220, an arbiter 230, a central processing unit (CPU) 240, a system memory 250, And a system bus 260. The coordinator is responsible for estimating the communication channel state and selecting and performing a method for avoiding interference between communication devices.

The coordinator obtains the status information of each communication module operating channel from the WLAN communication module 210 and the WPAN communication module 220 to estimate the communication status, and based on this information, the WPAN communication module is determined from the WLAN communication module. Quantitatively estimate the degree of interference received.

When the WPAN determines that the WPAN is seriously interfered by the WLAN through estimation of the communication channel condition, the method of avoiding mutual interference is selected by using the established information, and the communication modules are effectively adjusted to perform the selected interference avoidance method. The coordinator may be implemented as additional hardware 230 of the integrated communication device or may be an application program form 231 resident and operating in the system memory 250.

The system memory 250 includes a memory unit for storing an operating system (OS) 251, program data 252, various application programs 253, a device driver 254, and the like. The system bus 260 is used as a path for transmitting and receiving information necessary for the mutual interference avoidance operation between the WLAN communication module 210, the WPAN communication module 220, and the coordinator 230.

3 is a flowchart illustrating a procedure for avoiding mutual interference between a WPAN and a WLAN through an integrated communication device proposed by the present invention.

First, the coordinator in the unified communication device obtains information on the WLAN and WPAN using WLAN and WPAN communication modules in the device and estimates the channel state of the currently used WPAN (S310).

The coordinator periodically checks the state of the WPAN channel and if it determines that the overall link situation of the WPAN is bad, it measures the interference based on the collected information on the WPAN and WLAN (S320).

Based on the degree of interference, the coordinator determines a method of avoiding mutual interference between the WPAN and the WLAN (S330).

Thereafter, the coordinator acquires a channel of the WLAN interfering with the WPAN to temporarily suppress the use of the WLAN channel (S340) and controls the operation of the WLAN and WPAN communication modules according to the determined interference avoidance method (S330). In order to avoid mutual interference between the WLAN and the WPAN (S350).

Hereinafter, in the present invention, a method for avoiding interference between heterogeneous communication networks using an integrated communication device in an environment where heterogeneous communication networks operating in the same band coexist will be described in detail step by step shown in FIG. 3.

Within the device of an integrated communication device WLAN , WPAN  Via communication module WLAN , WPAN  Information collection and current use WPAN  Channel State Estimation

The integrated communication device periodically collects WLAN and WPAN information from WLAN and WPAN communication modules in the device.

The WLAN communication module in the integrated communication device searches for a network of WLAN access points (APs) operating around the integrated communication device using a network scan function.

Collects information about an operating frequency band and received signal strength indicator (RSSI) of each of the retrieved APs around the integrated communication device.

The RSSI value may be defined as a moving average value of k instantaneous RSSI values measured during a certain observation time T, thereby increasing the reliability of the RSSI value.

The WPAN communication module in the integrated communication device collects information on the WPAN link status to determine the WPAN status while operating as a PNC.

In order to correctly determine the link state, both an error free frame and a notable NACK (Not ACK) when the link condition is bad are used as measurement indicators of the WPAN link state.

Here, NACK means that if the WPAN device of the unified communication device does not receive the corrupted frame or the ACK (Acknowledge) in response to the downlink frame within a given time period, the timer expires and considers itself a NACK. Indicates.

4 is a flowchart illustrating a process of estimating the overall WPAN link state by a coordinator.

In this process, the coordinator counts the number of received frames without error for each WPAN link and the number of recognized NACKs, while the WPAN transceiver of the integrated communication device communicates with the WPAN devices configuring the WPAN.

If the number of frames received without an error reaches a predetermined threshold, the corresponding link state is determined to be good. If the NACK number reaches a predetermined threshold, the corresponding link state is determined to be bad.

This process is performed for each link constituting the WPAN, and the result of each link state obtained through this process is synthesized to estimate the WPAN channel state.

4 describes the process in more detail. In FIG. 4, j represents an index of an arbitrary link constituting each WPAN.

는 현재 WPAN 링크j의 채널상태가 얼마나 나쁜지를 나타내는 추정지표로 정의하고,

는 현재 사용중인 WPAN 채널의 전반적인 상태에 대한 임계값으로 정의한다.

Is defined as an estimation index indicating how bad the channel status of the current WPAN link j is,

Is defined as the threshold for the overall state of the WPAN channel currently in use.

및

은 각각 링크 j에 대한 무오류(error free) 프레임의 수신 개수 및 NACK 개수를 저장할 계수기 변수이다.

And

Is a counter variable to store the number of received error-free frames and the number of NACKs for link j, respectively.

및

는 각각 임의의 링크 j의

및

에 대한 임계값이다. S410 단계에서

을 정하고, 각 링크에 대한 무오류 프레임 수신 개수(

) 및 NACK 개수(

)를 저장할 계수기 변수들과 를 모두 0으로 초기화한다.

And

Is each of a random link j

And

Is the threshold for. In step S410

, And the number of error-free frames received for each link (

) And NACK counts (

) Initialize all counter variables and to 0 to store.

) 또는 NACK 계수기 변수(

)를 증가시킨다. After initialization, if the arbitrator receives an error-free frame or acknowledges a NACK for any WPAN link, it receives the error-free frame reception counter variable (

) Or NACK counter variable (

Increase

)를 증가(S440)시키고, NACK을 인지(S431)하였다면 해당 링크의 NACK 계수기 변수(

)를 증가(S441)시킨다. If the WPAN link receives error-free frames (S430), the number of error-free frames received on the link (

) Is increased (S440), and if the NACK is recognized (S431), the NACK counter variable (

Increase (S441).

)가 미리 설정한 임계치, 에 도달(S450)하면 링크가 좋다는 것을 의미하므로 해당 링크에 대한 WPAN 채널 상태의 추정지표를 1 감소(S460)시킨다. If no error frame reception counter variable (

) Reaches a preset threshold, S450, which means that the link is good, and the estimated index of the WPAN channel state for the link is reduced by one (S460).

)가 미리 설정한 임계치, 에 도달(S451)하면 링크가 나쁘다는 것을 의미하므로 해당 링크에 대한 WPAN 채널상태의 추정지표를 1 증가(S461)시킨다. If the NACK counter variable (

) Reaches a preset threshold, S451, which means that the link is bad, and increases the estimated index of the WPAN channel state for the link by one (S461).

) 및 NACK 계 수기 변수(

)를 초기화(S470)하여 링크 상태 추정을 계속하기 위한 준비를 한다. Then, the error-free frame reception counter variable for that link (

) And NACK counter variables (

) To prepare for continuing link state estimation.

)를 다 더하여 이 값

을 WPAN 채널 상태에 대한 임계값

와 비교(S480)한다. In order to estimate the overall state of the WPAN channel, the channel estimation index for each link (

) And add this value

Thresholds for WPAN channel status

Compare with (S480).

이 임계값보다 크면 WPAN이 간섭을 심하게 받고 있다고 판단(S490)하고, 그렇지 않을 경우(S491) WPAN 링크 모니터링을 계속하기 위하여 S420 단계로 돌아간다.If the sum of channel estimates for each link

If it is larger than this threshold, it is determined that the WPAN is severely affected by the interference (S490), and if not (S491), the process returns to step S420 to continue monitoring the WPAN link.

In order to determine the link status of the WPAN, a WLAN transceiver of the integrated communication device may broadcast a Hello message at once instead of transmitting a Hello message to each WPAN transceiver constituting the WPAN as described above. .

This method can be used to quickly identify channel conditions at an urgent time, such as when a channel condition suddenly causes severe fluctuations.

5 is a flowchart illustrating a process of estimating overall WPAN channel state using a Hello message.

에 대한 임계값

를 설정하고,

과

의 이동평균(moving average)

및 Hello 메시지를 전송할 회수를 세는 변수 i를 0으로 초기화한 후,

계산 때 사용할 이동평균 윈도우 크기 W를 정한다(S510). First, the coordinator is an estimate of how good the WPAN channel is.

Threshold for

, Set

and

Moving average of

And after initializing the variable i to 0 to count how many Hello messages to send,

The moving average window size W to be used in the calculation is determined (S510).

After initialization, the coordinator transmits a Hello message to the WPAN transceivers constituting the WPAN using the WPAN transceiver (S520).

및 ACK 개수의 이동평균

을 센다(S530). 통합통신장치의 WPAN 트랜시버가 Hello 메시지를 전송할 때마다 i를 1씩 증가(S540)시키므로, 이동평균의 윈도우 크기 W만큼 Hello 메시지를 전송한 이후, 즉 i가 W이상이 되면(S550) 유효한

값이 나온다. And the coordinator counts the number of ACKs for this message.

And moving average of ACK number

Counting (S530). Whenever the WPAN transceiver of the integrated communication device transmits a Hello message, i is increased by 1 (S540). Therefore, after transmitting the Hello message by the window size W of the moving average, that is, when i is greater than or equal to W (S550), it is effective.

The value comes out.

과 같다. If the window size W is 1, the Hello message is sent only once and the number of ACKs is counted.

Is the same as

값이 나왔을 때 만약

이

보다 크면(S560) WPAN이 간섭이 심하게 받고 있지 않다고 판단(S570)한다. Effective

When the value comes out

this

If greater than S560, the WPAN determines that the interference is not severely received (S570).

In the opposite case, the WPAN determines that the interference is severely received (S580).

This method has the advantage that it is simple to implement because there is no need to store and determine the link state for each WPAN link.

WLAN  Based on scan results WPAN  Channels WLAN  Measurement of interference received from networks

Estimating how much each channel of the WPAN is interfered with from the WLAN network is performed in step S320 of FIG.

Here, the interference degree is defined to estimate the amount of interference each channel of the WPAN receives from the WLAN network.

라고 정의하고, 이를 수학식 1과 같이 정한다. The degree of interference that WPAN channel j receives from WLAN network i

And define it as in Equation 1.

The interference definition includes the RSSI of the WLAN network to reflect how strong WLAN network i affects WPAN channel j, and zero to reflect whether the spectrum of the WLAN network is in the channel range that affects the spectrum of WPAN. Or an indicator function I having a value of 1 is introduced.

는 WLAN 네트워크 i의 RSSI의 이동평균(Moving Average)값을 WLAN 트랜시버의 하드웨어 사양에 정의되어 있는 RSSI의 최대값으로 정규화(normalize)한 값이며,

는WPAN 채널 j와 WLAN 네트워크 i의 중심 주파수를 이용하여 판단하는 값으로 WPAN j의 스펙트럼이 WLAN 네트워크 i의 스 펙트럼과 겹치면 1, 겹치지 않으면 0의 값을 가지는 지시함수(indicator function)로서 스펙트럼의 중첩도를 나타낸다. If you specify the interference definition,

Is a value obtained by normalizing a moving average value of the RSSI of the WLAN network i to a maximum value of the RSSI defined in the hardware specification of the WLAN transceiver.

Is a value determined by using the center frequencies of WPAN channel j and WLAN network i. Shows a figure.

The spectral superposition may be further subdivided to have a real value between 0 and 1 instead of two values of 0 or 1 so that the WPAN spectrum overlaps with the sidelobe of the WLAN spectrum.

The interference degree defined above is used to find a WLAN network causing interference to the WPAN channel and to find a WPAN channel that receives the least interference, and also when selecting an interference avoidance method.

Using integrated communication device WPAN  and WLAN  How to avoid mutual interference between

In the present invention, a method for avoiding interference between WLAN and WPAN using an integrated communication device in an environment in which heterogeneous wireless communication networks overlap, 1) an interference avoidance method by changing a WPAN channel, and 2) periodic acquisition of a WLAN channel of a WPAN We propose an interference avoidance method through

The selection of one of the two methods is made in S330 of FIG. 3.

As a method of determining one of the two proposed interference avoidance methods, we propose a method of determining one of the two interference avoidance methods based on the comparison between the measured interference for each of the WPAN channels and the currently used WPAN channel interference. .

According to this method, the method of avoiding mutual interference between WLAN and WPAN is determined as 1) when there is a channel with less interference than the currently used WPAN channel interference among WPAN channels, or 2 ) If there is no channel with less interference than the currently used WPAN channel interference among WPAN channels or if there is not much WPAN data information to be sent or received, the WPAN transceiver can obtain the desired information from the WPAN transceiver periodically by periodically acquiring the WLAN channel. Allows you to send and receive

(WLAN 네트워크 i가 WPAN 채널 j에 주는 간섭도)를 이용한다. The interference degree measured in step S320 of FIG. 3 to determine whether any of the WPAN channels has a lower interference level than that of the currently used WPAN channel.

(The degree of interference that WLAN network i gives to WPAN channel j).

를 모든 i에 대해 더한 값

를

라고 정의하면,

는 WPAN 채널 j에 간섭을 주는 모든 WLAN 네트워크의 간섭도를 더한 양이다.

Plus values for all i

To

If you define,

Is the amount of interference of all WLAN networks interfering with WPAN channel j.

를

로 정의하면,

는 현재 사용중인 WPAN 채널k가 겪는 간섭의 양인

보다 낮은 간섭도를 갖는 WPAN 채널들의 집합이 된다. The current WPAN channel is called k.

To

If you define as

Is the amount of interference experienced by the currently active WPAN channel k.

It becomes a set of WPAN channels with lower interference.

가 공집합이면 WLAN의 채널을 적게 받는 WPAN 채널이 존재하지 않는다는 것을 의미하므로, 중재장치(coordinator)는 간섭을 회피하는 방법으로서 현 재 사용 중인 WPAN 채널을 변경하지 않은 채로 WLAN 채널을 주기적으로 획득하는 방법을 선택한다. if

Is an empty set, it means that there is no WPAN channel that receives less WLAN channel, so that the coordinator periodically acquires the WLAN channel without changing the currently used WPAN channel. Select.

가 공집합이 아니면,

에 속한 채널 중 한 군데로 채널을 변경하는 방법을 선택하며 구체적 채널 선택 기준은 아래에서 상술한다.On the other hand

Is not an empty set,

A method of changing a channel to one of the channels belonging to the terminal is selected, and specific channel selection criteria are described below.

Hereinafter, the above two interference avoidance methods will be described in detail.

One) WPAN Low interference  Interference avoidance method by changing channel to channel

The present invention is a method of avoiding mutual interference between WLAN and WPAN, and is a method of changing an operation channel to a corresponding low interference channel when there is a channel having a lower interference level than a preset interference threshold among WPAN channels.

In this case, the new channel to be moved is one of the WPAN channels having an interference level lower than that of the currently used WPAN channel, and the following method for determining a new channel to be moved is proposed.

라고 할 때,

에 속한 채널 중에 다른 WPAN이 이미 사용하고 있는 채널이 있을 수 있으므로

에 속한 채널들에 대해 (1) 에너지 검출을 하여 이 값 이 낮은 채널들 가운데 최근에 이 채널로 채널 변경 이 이루어지지 않은 채널을 이동할 새 채널로 선택하거나 (2) 에너지 검출을 하여 이 값이 가장 낮은 채널을 이동할 새 채널로 선택하는 방법을 사용한다.A set of WPAN channels with an interference lower than that of the current WPAN channel k is used.

When I say

Some of the channels in may already be in use by other WPANs.

Among the channels with low value, (1) the energy detection is performed on the channels belonging to and the channel that has not been recently changed to this channel is selected as a new channel to move, or (2) Use the method of selecting the lower channel as a new channel to move.

In order to perform interference avoidance, a process of connecting to an interfering WLAN channel is required. To this end, a process of identifying which WLAN network interferes will be described in detail below.

6 is a flow of processing in which the unified communication device determines which WLAN network in the vicinity caused this interference when the WPAN is experiencing severe interference.

보다 큰 WLAN 네트워크의 index는 따로 저장을 해 두는데 이 index의 set을

라고 정의한다. When the channel index of the currently used WPAN is called j, the interference received by the WPAN j is critical.

The index of the larger WLAN network is stored separately.

It is defined as.

를 공집합으로 설정하고,

를 설정한다 (S610). Based on this, the process of finding the Musanlan network that causes the most interference is as follows. first

Set to the empty set,

Set to (S610).

The next set S is defined as a set of index i of all discovered WLAN networks (S620).

와 임계값

를 비교하여(S630)

가

보다 큰 WLAN 네트워크의 인덱스 i를 에 추가한다 (S640). Interference of WLAN Network i in Set S on WPAN Channel j

And threshold

By comparing (S630)

end

The index i of the larger WLAN network is added to (S640).

로 정의된다. 만일

가

보다 작으면

에 대한 변화 없이 곧바로 집합 S에서 i를 제외한다(S650). In other words

Is defined as if

end

Less than

Immediately, i is excluded from the set S without a change to (S650).

If the set S is an empty set (S660), if the set S is not an empty set (S630), the process is repeated, and if the set S is an empty set, the most influential network k is obtained (S670).

로부터, 현재 사용 중인 WPAN 채널 j에 가장 영향을 미치는 WLAN 네트워크의 인덱스 k는

가 된다 (S670). Obtained through the above process

From the WLAN network that most affects the WPAN channel j currently in use

(S670).

Therefore, the coordinator determines the WLAN network k as the WLAN network having the most serious influence on the WPAN channel j.

In addition, a process of associating with the WLAN network is performed.

If the WLAN transceiver of the unified communication device is connected to the most disturbing WLAN network, the WLAN channel license should be obtained to suppress the interference to the WPAN. During the time when interference is suppressed, the WPAN needs to adjust the timing of acquiring the WLAN channel to match the beacon transmission timing of the WPAN so as to transmit and receive control data for changing the channel.

In order to effectively do this, the WLAN transceiver of the integrated communication device performs channel sensing for a shorter time than the time defined in the standard, and the time to start WLAN channel sensing takes into consideration the WPAN beacon transmission timing. How to adjust the WLAN channel usage time and usage mode to ensure enough WLAN channel usage time so that WPAN data can be transmitted in the non-competitive access section (CFP) or the competitive access section (CAP) following WPAN beacon transmission. Suggest.

Each of these processes will be described in detail below.

First, in order to enable the integrated communication device to properly adjust the timing of acquiring the WLAN channel, a method of giving priority to channel use may be used through a method of reducing carrier sensing time.

In the present invention, it is assumed that a WLAN device of an integrated communication device operates as a distributed coordination function (DCF).

The IEEE 802.11 standard defines four interframe interval times as EIFS (Extended Interframe Space), DIFS (Distributed Interframe Space), PIFS (Point Interframe Space), and SIFS (Short Interframe Space). In this case, carrier sensing and channel acquisition are attempted during DIFS time before transmitting a channel reservation frame (RTS) or data frame.

In the present invention, the integrated communication device senses a carrier for a shorter time than other WLAN communication modules and attempts to acquire a channel to obtain priority in channel acquisition.

That is, the sensing time of the integrated communication device can be set to DIFS-Δ, where Δ is a value in the range of 0 <Δ <DIFS-SIFS. Setting the Δ value to a value smaller than the DIFS-SIFS means that when the WLAN communication module of the integrated communication device senses a carrier for a shorter time than the SIFS and attempts to acquire a channel, the other WLAN transceiver This is because the device may acquire a channel before receiving an ACK after data transmission, in which case there is a risk that the WLAN may operate abnormally.

는 SIFS<

< DIFS 의 값을 갖는다. 이를 통해 통합통신장치가 타 WLAN 통신 모듈들보다 WLAN 채널 액세스 기회를 우선적으로 얻을 수 있다. According to the method proposed by the present invention, carrier sensing time of the WLAN communication module of the integrated communication device

Is SIFS <

It has a value of <DIFS. This allows the unified communication device to preferentially obtain WLAN channel access opportunities over other WLAN communication modules.

In order for the WPAN to communicate properly, the beacon frame transmitted by the WPAN's PNC must be transmitted to devices in the WPAN without interference from the WLAN.

In addition, the PNC and the devices in the WPAN transmit and receive data frames in a contention access section (CAP) or contention access section (CFP) after receiving a beacon frame, and control the timing so that these data frames can be transmitted without WLAN channel interference.

으로 정의한다. Beacon Offset indicates how far the timing at which the WPAN's beacon frame is transmitted deviates from the correct periodic timing

It is defined as

이 일정값 이상 커질 경우 WPAN 장치들의 동기(synchronization)가 무너져 WPAN 동작이 어려워질 수 있는데 본 발명에서는 통합통신장치를 이용하여 WLAN 채널 액세스를 시작하는 시간

을 조정하여

을 0 에 가깝게 하는 방안을 제안한다. Beacon Offset

If this value is larger than a predetermined value, the synchronization of the WPAN devices may be broken, which may make WPAN operation difficult. In the present invention, a time for starting WLAN channel access using an integrated communication device is disclosed.

By adjusting

We propose a way to make the value close to zero.

으로 고정되어 있을 때, 통합통신장치의 WLAN 트랜시버가 이 비컨 전송구간을 포함하는 시간구간동안 WLAN 채널을 점유할 수 있는 경우를 보여준다. 7 illustrates a timing at which the WPAN transceiver of the integrated communication device should transmit a beacon.

When fixed to, the WLAN transceiver of the unified communication device can occupy the WLAN channel for the time period including this beacon transmission period.

(S710) 부터 WLAN 채널은 경쟁 상태에 놓이게 된다. As shown in Figure 7 when the ACK reception of the WLAN communication module is finished

From S710, the WLAN channel is in a contention state.

시간 동안 반송파 감지 후 채널 획득을 시도하고, 이를 통해 타 WLAN 통신 모듈을 제치고 RTS-CTS 핸드 쉐이크 (S720) 를 수행하여 WLAN 채널을 확보한다. In this case, the WLAN communication module of the integrated communication device is shorter than the DIFS as described above.

After detecting the carrier for a time, the channel acquisition is attempted, thereby overtaking other WLAN communication modules to perform the RTS-CTS handshake (S720) to secure the WLAN channel.

(S730)이

(S740) 보다 앞서므로 WLAN 간섭을 억제하는 시간동안 WPAN 비컨을

없이 전송할 수 있다. WLAN channel acquisition time

(S730)

(S740), the WPAN beacon during the time to suppress the WLAN interference

Can be sent without.

(S730) 과

(S740) 사이에 약간의 시간 여유를 두는데, 이를

(S760) 이라고 정의한다. In FIG. 7, the timing at which the WLAN AP transmits the CTS frame allowing the WLAN communication module of the integrated communication device to use the WLAN channel (S750) is completed.

(S730) and

Leave some time between (S740),

It is defined as (S760).

은 고정길이이며 중재장치(coordinator)가 값을 정할 수 있다. 고정 길이의

을 도입하는 것은 채널 확보를 한 직후부터 비컨을 전송하는 시간까지 약간의 여유시간이 존재하여 비컨이 WLAN의 간섭으로부터 확실하게 벗어나게 만들기 위한 것이다.

Is fixed length and can be determined by the coordinator. Fixed length

The introduction of a is to allow some time from immediately after channel acquisition until transmission of the beacon so that the beacon is reliably free from WLAN interference.

(S740) 보다 더 먼저

(S710) 에서 끝났고,

(S710)와

(S740) 사이 시간 동안 통합통신장치의 WLAN 통신 모듈이 RTS-CTS 핸드 쉐이크(S720) 를 완료하여 WLAN 채널사용권을 확보할 수 있었기 때문이다. In the time flow diagram of FIG. 7, the WLAN communication module of the integrated communication device may acquire the WLAN channel according to the beacon timing of the WPAN.

Before (S740)

Finished at (S710),

(S710) and

This is because the WLAN communication module of the integrated communication device completes the RTS-CTS handshake S720 during the time between operations S740 to secure the WLAN channel usage rights.

(770) 보다 늦은 시간에 WLAN 채널 예약을 시작하여 채널 사용을

(710)보다 약간 늦게 끝 냈다면, 통합통신장치의 WLAN 트랜시버가 채널 사용 예약을 끝내고 채널 사용을 시작할 수 있는 시점이

(740)보다 늦어져서 정해진 여유시간

(760)만큼 여유시간을 확보할 수 없게 된다. If the WLAN communication modules other than the integrated communication device

(770) Start WLAN channel reservations later than the channel usage

If it finishes slightly later than 710, there is a point where the WLAN transceiver of the unified communications device can finish the channel reservation and begin using the channel.

Delayed time later than 740

As much as 760, the spare time cannot be secured.

,

) 동안 통합통신장치의 WLAN 통신 모듈이 RTS-CTS 핸드 쉐이크를 마치지 못할 수 있고, 더 늦어질 경우에는

이후에 RTS-CTS 핸드 쉐이크를 시작했을 것이다. 이때에는

을 0으로 만들지 못하게 되어 WPAN의 트랜시버들의 동기가 깨어질 가능성이 높아진다. If the channel reservation start time of another WLAN transceiver is later than the above,

,

WLAN communication module of the integrated communication device may not complete the RTS-CTS handshake,

You might have started the RTS-CTS handshake later. At this time

It is not possible to make 0 to 0, which increases the likelihood that WPAN transceivers will be out of sync.

동안 통합통신장치의 WLAN 통신 모듈이 WLAN 채널을 확보하는 확률을 높이기 위해서는 충분히 이전부터 WLAN 채널을 미리 확보해두는 것이 필요하다. Therefore, the time period in which the WPAN Beacon frame should be transmitted

In order to increase the probability that the WLAN communication module of the integrated communication device secures the WLAN channel, it is necessary to secure the WLAN channel in advance.

동안 통합통신장치의 WLAN 통신 모듈이 WLAN 채널을 확보하는 확률을 높이려는 목적을 위해 비컨을 보내는 시점

충분히 이전부터 WLAN 채널을 확보하는 과정을 나타내는 시간 흐름도이다. 8 is a time interval for transmitting a beacon of the WPAN

During which the beacon sends a beacon for the purpose of increasing the probability that the WLAN communication module of the unified communications device will acquire a WLAN channel.

This is a time flow diagram showing the process of securing the WLAN channel from the previous time.

(810) 부터 통합통신장치의 WLAN 통신 모듈이 채널 감지 (sensing)을 시작하여

(820) 동안 채널이 idle하면

시점 (830) 에서 채널 사용을 위해 RTS-CTS 핸드 쉐이크에 들어간다.

From (810) the WLAN communication module of the integrated communication device starts channel sensing (sensing)

If the channel is idle during (820)

At point 830, the RTS-CTS handshake enters for channel use.

(810)은

(830)-

(820)으로 정해지기 때문에

(830)이

(840)과 어떤 관계를 가지고 있는지 정해야만 시간구간 [, +]동안을 통합통신장치의 WLAN 트랜시버가 WLAN 채널을 획득할수 있다.

810 is

(830)-

Because it is set to (820)

(830)

It is necessary to determine the relationship with 840 so that the WLAN transceiver of the integrated communication device can acquire the WLAN channel for the time interval [, +].

(830) 이

(840) 보다 얼마나 앞서야 하는지를 유도할 수가 있다. 도 7에서

(760) 은 고정길이

(760) 에 대하여 수학식 2가 유도된다. Referring to Figure 7

(830) Lee

It can be derived how far ahead of (840). In Figure 7

760 is fixed length

Equation 2 is derived for 760.

(720)는

이다. Where RTS-CTS handshake 720 time interval

720

to be.

(770)과 관련하여 중요한 점은,

(770) 이후에 통합통신장치의 WLAN 통신 모듈이 아닌 다른 WLAN 통신 모듈이 WLAN 채널을 예약하는 것을 막기 위해서는, 늦어도 시간

(770) 에는 통합통신장치의 WLAN 통신 모듈이 WLAN 채널 사용을 예약하는 RTS 프레임을 전송해야 한다는 점이다. In Figure 7

The important thing about 770 is that

To prevent a WLAN communication module other than the WLAN communication module of the unified communication device from reserving the WLAN channel after 770, at least later time.

In 770, the WLAN communication module of the unified communication device must transmit an RTS frame that reserves the use of the WLAN channel.

을 바탕으로 도 8에서 통합통신장치의 WLAN 트랜시버가 채널 사용을 위하여 RTS 프레임을

(830)때 전송하기 시작한다. So defined

On the basis of FIG. 8, the WLAN transceiver of the integrated communication device uses the RTS frame for channel use.

When (830) begin to transmit.

후 RTS 프레임 전송을 시작하므로, 채널 감지(sensing)을 시작하는 시간

은 늦어도 시간

-

이어야 한다. The WLAN transceiver of the unified communications device

Time to start channel sensing after starting RTS frame transmission

At least no time

-

Should be

이전에 통합통신장치의 WLAN 통신 모듈이 RTS 프레임을 전송하면,

이 되기 전에 다른 WLAN 통신 모듈은 통합통신장치 WLAN 통신 모듈의 RTS 프레임을 감지(sensing)하게 되므로 NAV (Network Allocation Vector) 에 들어간다. if

If the WLAN communication module of the unified communication device previously transmits an RTS frame,

Before this, the other WLAN communication module senses the RTS frame of the integrated communication device WLAN communication module and thus enters the Network Allocation Vector (NAV).

을 0으로 만들 수 있다. On the other hand, the WLAN communication module of the integrated communication device receiving the CTS 860 from the WLAN AP operates in the fragment burst mode, thereby sufficiently securing the WLAN channel usage time 870.

Can be zeroed out.

로 정확하게

-

을 사용하면, 도 7에서

(740) 과

(730) 의 시간은

이 되고,

이면 도 7에서

(740) 과

(730) 사이의 시간은

보다 커지게 된다. if

Exactly as

-

In Figure 7,

740 and

The time of 730 is

Become,

Back in Figure 7

740 and

The time between 730

It becomes bigger.

에 대하여 효과적으로 WLAN 채널을 사용하기 위해서는 채널 감지(sensing) 시작 시간

을

-

로 잡는 것이 좋다.So of proper length

Channel sensing start time to effectively use WLAN channel

of

-

It is good to catch.

의 조정을 통하여 비컨 전송 타이밍에 맞게 WLAN 채널의 사용권을 얻을 수 있다. WLAN 채널 획득 과정에서 WLAN 표준은 WLAN 프레임의 데이터 크기를 RTS의 duration 필드에 쓰도록 요구하고 있다. As described above

By adjusting the value of the WLAN channel can be obtained according to the beacon transmission timing. In the WLAN channel acquisition process, the WLAN standard requires that the data size of the WLAN frame be written in the duration field of the RTS.

The value used in the duration field is a value obtained by converting the length of WLAN data into a transmission time. In the present invention, this time may be regarded as a time for transmitting and receiving data of the WPAN in a situation where WLAN interference is suppressed. The setting of this duration value is described below.

9 shows the structure of an RTS frame 910.

There is a Frame Control field 911 in the RTS frame, and subfields such as Type 921 and Subtype 922 are defined in the Frame Control field. The combination of these two fields defines the function of the RTS.

When the Type field is 01, two cases where the corresponding subtypes are 1101 and 1111 are defined in the standard as Reserved. This reserved field is used to inform the access point that channel access time has been obtained but will not transmit a WLAN data frame.

In an embodiment of the present invention, when the Type subfield of the Frame Control field of the RTS field is 01 and the Subtype is 1101, it is defined as representing a normal WLAN frame (930), and the Type field is 01 and the Subtype is 1111. It is defined 940 to indicate that another device transmits during this time and no WLAN frame.
In other words, when transmitting an RTS control frame to a WLAN communication standard device allowing channel access of the WLAN communication module to obtain a channel access opportunity of the WLAN communication module, the channel of the WLAN communication module is secured for transmitting and receiving data between the WPAN communication modules. The RTS control frame indicates that the frame of the WLAN communication module is not transmitted for a while.

The IEEE 802.11 WLAN standard defines that in fragment burst transmission, a WLAN AP sends an ACK after receiving each fragment.

WLAN communication modules in the NAV (RTS) state that receive the ACK enter the NAV (ACK) again. At the same time, the WLAN AP receiving the fragments following the SIFS interval can be seen that the fragment burst mode is maintained.

In an embodiment of the present invention, fragment burst mode may be used to continuously secure a WLAN channel. In this case, since the WLAN fragment is not actually transmitted but WPAN data is transmitted instead, it is necessary to inform the WLAN AP of the fragment number in advance in the RTS frame transmission step.

To this end, subfields of Type 921 and Subtype 922 of the RTS frame 910 are used. When the Type 921 field is 11, it is defined as reserved, and thus all Subtype subfields for Type 11 are reserved. This Subtype field is used to tell the number of virtual fragments to use through fragment burst mode.

In an embodiment, when the type is 11, the number of fragments may be expressed by using all four bits of the subtype field (b3b2b1b0) (950).

In the present patent, the transmission mode of the WLAN is not limited to the fragment burst mode. Fragment burst mode transmission is used to secure the WLAN channel for a longer period of time. If a small WPAN beacon offset is allowed, the basic transmission mode may be used instead of the fragment burst mode.

(1010)이라고 정의하고, WPAN의 superframe의 비컨 주기를

(1020)이라고 정의하고

이 가질 수 있는 최대 길이를

라고 할 때,

가

(1020)보다 큰 상황에서 WLAN 채널 획득 시간(1030)과 WPAN의 비컨 타이밍(1040) 및 WPAN 액세스 시간(1050)과의 타이밍 동기가 비교적 잘 맞는 시나리오를 나타낸다. 10 shows a time obtained by adding one WLAN fragment transmission time and a subsequent ACK transmission time.

1010 and define the beacon cycle of the WPAN superframe.

(1020)

The maximum length this can have

When I say

end

In a situation larger than 1020, a timing synchronization between the WLAN channel acquisition time 1030 and the beacon timing 1040 of the WPAN and the WPAN access time 1050 is relatively well matched.

인 관계(N은 자연수)를 가지면 WLAN 채널 획득 시간과 WPAN의 비컨 타이밍 및 WPAN 액세스 시간과의 타이밍 동기를 비교적 잘 맞게 된다. 이때 동기가 맞다는 것은 WLAN 채널 액세스를 통하여 WPAN의 비컨 전송을 할 때 비컨 전송의 타이밍이 어긋나는 시간

이 거의 0이 된다는 것을 의미하며, 동시에 WPAN의 데이터 전송을 하는 구간(1050)이 WLAN 채널 사용이 억제된 시간 (1030)과 충분히 많이 중첩된다. if

With the relation (N is a natural number), the timing synchronization between WLAN channel acquisition time and WPAN's beacon timing and WPAN access time is relatively well matched. In this case, the synchronization is a time when the timing of the beacon transmission shifts when the beacon transmission of the WPAN is performed through the WLAN channel access.

This means that almost 0, and at the same time, the interval 1050 for data transmission of the WPAN overlaps with the time 1030 when the WLAN channel usage is suppressed sufficiently.

가

보다 큰 상황에서

을 조정하여

를 만족시키는 방법을 제시한다.

을 만족시키기 위하여,

을

에 맞도록 현재 WLAN의 전송 속도를 고려하여 WLAN 의 fragment 사이즈를 최대 길이의 fragment 크기보다 작게 결정하고, 이 fragment 크기를 RTS 프레임의 duration 필드에 반영한다. In this patent

end

In greater circumstances

By adjusting

It suggests how to satisfy.

To satisfy you,

of

In consideration of the transmission rate of the current WLAN, the fragment size of the WLAN is determined to be smaller than the fragment length of the maximum length, and the fragment size is reflected in the duration field of the RTS frame.

가

보다 큰 상황에서

을 조정하여

을 만족시키면 N 의 값은 항상 1 이다. As in the scenario of Figure 10

end

In greater circumstances

By adjusting

When is satisfied, the value of N is always 1.

Other WLAN transceivers enter the NAV (RTS) 1060 during the time that the unified communications device acquires and uses the WLAN channel.

When the integrated communication device is transmitting in fragment burst mode, another WLAN transceiver enters the NAV (ACK) 1070 after the NAV (RTS).

(1110)과

(1120)을 도 10에서와 같이 각각 한 개의 WLAN fragment 전송 시간과 이어지는 ACK 전송시간을 더한 시간 및 WPAN의 superframe의 비컨 주기라고 정의했을 때,

가

(1120)보다 작은 상황에서 WLAN 채널 획득 시간(1130)과 WPAN의 비컨 타이밍(1140) 및 WPAN 액세스 시간(1150)과의 타이밍 동기가 비교적 잘 맞는 시나리오를 나타낸다. 11 is

(1110) and

When 1120 is defined as a time of adding one WLAN fragment transmission time and a subsequent ACK transmission time and a beacon period of the superframe of the WPAN as shown in FIG.

end

In a situation smaller than 1120, a timing synchronization between the WLAN channel acquisition time 1130 and the beacon timing 1140 of the WPAN and the WPAN access time 1150 may be relatively good.

가

보다 작은 상황에서

을 조정하여

를 만족시키는 방법을 제시한다.

을 만족시키기 위하여,

의 배수가

와 같아지도록 현재 WLAN의 전송 속도를 고려하여 WLAN fragment 사이즈를 결정하고, 이 fragment 크기를 RTS 프레임의 duration 필드에 반영함으로서 실현된다. In this patent

end

In a smaller situation

By adjusting

It suggests how to satisfy.

To satisfy you,

Multiple of

By determining the WLAN fragment size in consideration of the transmission rate of the current WLAN to be equal to, and reflecting this fragment size in the duration field of the RTS frame.

에서 N이 2 이다. 통합통신장치가 무선랜 채널을 획득하고 사용하는 시간동안 도 10과 마찬가지로 다른 무선랜 트랜시버들은 NAV(RTS) (1160)에 이어 NAV(ACK) (1170)에 들어가게 된다. In the scenario of FIG. 11

Where N is 2. During the time that the unified communication device acquires and uses the WLAN channel, other WLAN transceivers enter the NAV (ACK) 1170 following the NAV (RTS) 1160.

Through the above method, an WLAN channel interfering with the beacon period of the WPAN is obtained, and an environment in which the WPAN data can be transmitted and received in a situation where the interference of the WLAN is suppressed by adjusting the WLAN channel usage time is provided.

At this time, the WPAN data actually transmitted is a channel change control frame for performing an interference avoidance method called a WPAN channel change. In this control frame, new channel information to be moved in the WPAN is written. If the WPAN transceivers successfully receive the control frame and successfully change the channel, the interference avoiding method through the channel change to the WPAN low interference channel is completed.

2) WPAN WLAN  Interference avoidance method through periodic acquisition of channel

According to the present invention, when the interference of all WPAN channels is below a preset interference threshold or when a small amount of data is temporarily exchanged in a given channel environment, the integrated communication device periodically performs a WLAN channel without changing the current operating channel. Acquire and suppress interference caused by the WLAN to the WPAN and transmit data of the WPAN during the acquired WLAN time.

The process of performing the interference avoidance method is a process of performing an interference avoidance method by changing a channel to a WPAN low interference channel. The process of 1) finding and connecting to a WLAN network interfering with the current WPAN, and 2) obtaining a channel of the WLAN Exactly matches In the scheme of avoiding interference by acquiring the interfering WLAN channel and changing the channel to the WPAN low interference channel, the scheme avoids interference by periodically acquiring the WLAN channel of the WPAN while transmitting the WPAN frame for channel change control after the WLAN channel is acquired. The method differs in transmitting and receiving general WPAN data.

According to the above-described configuration of the present invention, the coordinator of the integrated communication device node having the WPAN communication module and the WLAN communication module collects information from these two communication modules to continuously monitor the situation of the WPAN and the surrounding WLAN network. Check it. If the coordinator determines that the link condition of the WPAN is not good due to the WLAN interference, the coordinator selects an appropriate method to avoid the WLAN interference based on the collected information. In order to carry out this scheme, it connects to the interfering WLAN network and acquires a WLAN channel to suppress the interference of the WLAN and then to avoid the interference.

As a way to avoid the interference, it may be considered to move the channel used by the WPAN to another channel with less interference. In this case, the coordinator estimates the channel with the least interference based on the information collected from the WPAN and WLAN communication modules, and suppresses the interference caused by the WLAN when exchanging control information of the WPAN to move to this channel. A method of acquiring a WLAN channel license may be used.

If the situation of the other channel of WPAN is not much better than the channel currently being used or if you want to send and receive a small amount of data in the current channel situation, obtain the WLAN channel license while maintaining the current WPAN channel, and then WPAN data can be sent and received at the time when interference is suppressed.

WLAN and WPAN are the fastest growing wireless networks. This patent allows the WPAN to overcome the interference by actively determining the interference situation and selecting an interference avoidance method in a situation where the WLAN causes severe interference to the WPAN as described above. Coexistence of WLAN and WPAN may be realized by using a communication apparatus and an interference avoidance method.

Claims (20)

An integrated communication apparatus for enabling a second wireless communication by avoiding interference from the first wireless communication, A first wireless communication module compliant with a first communication standard; A second wireless communication module conforming to a second communication standard different from said first communication standard; A coordinator for controlling operations of the first wireless communication module and the second wireless communication module, selecting and performing a method for estimating a communication channel state and avoiding interference between communication devices; A system memory for storing a program relating to the integrated communication device; A system bus used as a path for transmitting and receiving information necessary for mutual interference avoidance operation between the first wireless communication module, the second wireless communication module, and the arbitration apparatus; A central processing unit controlling an integrated communication device through the system bus and processing all signals relating to the device; The arbitration apparatus measures the degree of interference by the first radio communication on each channel of the second radio communication, and then selects a method for avoiding interference from the first radio communication based on the measured interference degree. Integrated communication device. The method according to claim 1, And wherein the first wireless communication is IEEE 802.11 WLAN and the second wireless communication is IEEE 802.15.4 WPAN. The method according to claim 1, The arbitration apparatus is implemented as a hardware of the integrated communication device or integrated communication device, characterized in that implemented in the form of an application program operating in the system memory. The method according to claim 1, The program stored in the system memory is composed of an operating system, program data, application programs, device drivers. When two or more heterogeneous communication networks sharing a common wireless transmission medium coexist, when one network is severely interrupted by another network and communication is difficult, the first radio communication device and the second radio complying with the first radio communication standard. In a unified communication device having a second wireless communication device compliant with a communication standard simultaneously, Collecting, by the arbitration device of the integrated communication device, information of the first wireless communication network and the second wireless communication standard network, and determining a channel state of the second wireless communication device currently in use; Investigating a degree of interference of a channel of a second wireless communication standard using the collected information and a first wireless communication network scan result; Selecting an interference management method of a second wireless communication network based on the survey result; Investigate the first wireless communication network that causes the largest interference to the second wireless communication device for use in the communication of the second wireless communication device, connect to the first wireless communication network, and then Obtaining channel access time; And performing an interference avoidance method for the second wireless communication device by obtaining a channel access time of the first wireless communication device. The method according to claim 5, The first wireless communication device is an IEEE 802.11 WLAN device, the second wireless communication device is an interference avoiding method using an integrated communication device, characterized in that the IEEE 802.15.4 WPAN device. The method according to claim 6, The interference degree of the WLAN network to the WPAN device is as shown in Equation (3).

(here,

Is a normalized moving average value of the RSSI of the WLAN network i to the maximum value of the RSSI defined in the hardware specification of the WLAN transceiver.

Is a value that is determined using the center frequency of WPAN channel j and WLAN network i. It is an indication function that has a value of 1 when the spectrum of WPAN j overlaps with the spectrum of WLAN network i. The method according to claim 7, Avoidance of interference using an integrated communication device, characterized in that the WPAN spectrum overlaps with the sidebands of the WLAN spectrum by subdividing the spectral overlap to have a real value between 0 and 1 instead of two values of 0 or 1. Way. The method according to claim 5, The interference avoidance method is an interference avoidance method by changing a second wireless channel or an interference avoidance method by periodically acquiring a first wireless communication channel of a second wireless communication. The method according to claim 9, The method of avoiding interference by changing the second wireless channel includes changing an operation channel to a corresponding low interference channel when there is a channel having a lower interference than a preset interference threshold among the second wireless channels. Interference avoidance method using. The method according to claim 9, Interference avoidance method through the periodic acquisition of the first wireless communication channel of the second wireless communication, Identifying which WLAN network is causing the most interference; Connecting to the most interfered WLAN network; Adjusting timing for WLAN channel acquisition in the connected WLAN network; Acquiring a WLAN channel right at the adjusted timing; Interference avoidance method using an integrated communication device comprising a. The method according to claim 11, How to adjust the timing for WLAN channel acquisition How the WLAN transceiver of the unified communication device performs channel detection for a shorter time than defined in the standard, How to adjust the time to start WLAN channel detection in consideration of the WPAN beacon transmission timing, WLAN channel usage time and usage mode Method of avoiding interference using an integrated communication device, characterized in that by adjusting the WPAN beacon transmission to ensure that the WPAN data is sufficiently secured to use the WLAN channel time to be transmitted in the non-competitive access section or the competitive access section. The method of claim 5, When transmitting a first message to a first communication standard device allowing channel access of the first communication device to obtain a channel access opportunity of the first communication device, the first communication device of the first communication device for data transmission and reception between the second communication devices. An interference avoidance method using an integrated communication device, characterized in that the first message indicates that the frame of the first communication device is not transmitted while the channel is secured. The method of claim 13, The first message is an interference avoidance method using an integrated communication device, characterized in that the request to send (RTS) control frame utilizing the type and subtype of the frame control field. The method of claim 13 The first message is an interference avoidance method using an integrated communication device, characterized in that by adjusting the duration field to synchronize the channel acquisition time of the network according to the first communication standard and the beacon period of the device according to the second communication standard. The method of claim 12 The method for adjusting the time to start the WLAN channel detection in consideration of the beacon transmission timing of the WPAN When the maximum time that the first communication device can acquire and use is greater than the beacon period, the channel use time is adjusted to make the channel use time secured by the first communication device equal to the beacon period of the second communication device, and the first communication When the maximum time the device can acquire and use is less than the beacon period, the channel usage time is adjusted so that the multiple of the channel usage time secured by the first communication device is equal to the beacon period of the second communication device. Interference avoidance method using communication device. The method of claim 5, When the arbitration device of the integrated communication device requests access to the first communication device channel through a first message, to secure the first communication device channel stably during the beacon transmission time and subsequent data transmission time of the second communication device. An interference avoiding method using an integrated communication device, characterized by using the fragment burst mode of the first communication device standard. The method of claim 17, When the arbitration device of the integrated communication device operates the communication module of the communication device conforming to the first communication standard in the fragment burst mode, the first communication to allow the channel number of the first communication device to the fragment number through the first message Interference avoidance method using an integrated communication device, characterized in that telling the standard device. The method of claim 5, DIFS-Δ instead of DIFS (Distributed Interframe Space) as a time interval in which the arbitration device of the integrated communication device detects a carrier and starts to acquire a channel for a channel access request of a communication device conforming to the first communication standard for the purpose of interference avoidance. Method of avoiding interference using an integrated communication device, characterized in that to obtain a priority for using the channel using. (Where Δ is a value in the range of 0 <Δ <DIFS-SIFS (Short Interframe Space).) The method of claim 5, Adjusting the time at which the arbitration device of the unified communication device starts a WLAN channel access attempt to periodically acquire a channel of the communication device conforming to the first communication standard to match the beacon timing of the device conforming to the second communication standard; Interference avoidance method using an integrated communication device.

Images