KR101053218B1 - Adaptive Frequency Interference Avoidance Method According to Interference Frequency Duty - Google Patents

Abstract

The present invention relates to a method in which a low power terminal that transmits and receives packet type data at an active area time of a certain duty cycle in a specific frequency band avoids frequency interference with neighboring heterogeneous wireless terminals. If it is determined that data transmission has failed due to deterioration of the surrounding frequency environment, the packet type data with the minimized transmission data is generated, and then the duty cycle corresponding to the size of the data is generated and sent out to recognize the surrounding frequency environment. A first process of doing; A second process of generating a duty cycle having a width of a specific active state and a sleep state corresponding to the surrounding frequency environment recognized through the first process; And a third process of generating data of a packet type having a data amount corresponding to the active state of the duty cycle generated in the second process, and performing data communication. In the case of relatively high power communication terminals according to communication protocols such as wireless LAN (IEEE802,11 a / b / g) or Bluetooth (IEEE802.15.1), which form various communication networks using open frequency, Although the frequency interference is avoided through, the relatively low power communication terminals according to the communication protocols such as UWB, USN, etc. can solve the problem that the data transmission rate deteriorated extremely when mixed with the high output communication terminals in the same space. It became.

Description

Adaptive Frequency Interference Avoidance According to Interference Frequency Duty {ADAPTABILITY FREQUENCY INTERFERENCE EVASION METHOD}

The present invention relates to a method for avoiding frequency interference on a wireless network, and more particularly, to a frequency duty used in a heterogeneous wireless network in which interference occurs during data communication between terminals in a wireless network using an industrial, scientific and medical equipment (ISM) frequency band. The present invention relates to an adaptive frequency interference avoidance method according to an interference frequency duty so that a duty cycle can be adaptively suppressed by changing its duty cycle into an interference avoidable duty region by scanning a cycle.

As the radio technology including electronic and communication technology has developed remarkably, and the use thereof has increased exponentially, the paradigm of the use of radio waves has changed. The applications range from u Health, underground exploration, T-commerce, and national security using body area network technology.

Moreover, with the development of software-defined radio (SDR) technology, a single radio device covers a wide frequency range. Recently, wireless devices are evolving dramatically with the emergence of 'cognitive radio technology'.

In particular, wireless technology refers to a device in which a wireless device measures an electric wave environment of the surrounding area and communicates while adaptively learning using the measured information. Such technology is expected to be widely applied to the secondary market in TV white space, which refers to idle frequencies remaining as remaining bands due to the digitalization of 5G mobile communication, military communication, and analog broadcasting.

In addition, low-power wireless technology is further developed in the face of the ubiquitous society, and low-power equipment continues to emerge from WLAN, RFID, Bluetooth, UWB, Zigbee, and recently popular BAN equipment. The service is expected to be further activated.

These low-power radios will be fused with UWBs that use spectrum underlay, making digital u-life a reality in homes and offices. On the other hand, this useful dissemination on the other hand, as in Big Brother in George Orwell, should also be devised to protect the privacy of individuals from being invaded or controlled.

In addition, contention-based protocols, which can avoid interference when more devices are used, are emerging as issues, and the 2.4-GHz Industrial Scientific Medical (ISM) band or the 5--Unlicensed Network Information Infrastructure (UNI) band Likewise, open frequency bands that are randomly used without permission for each use are gradually expanded, and wireless network terminals intending to use them are flooded in the same space according to their purpose, and thus, there is a strong need for a technique for avoiding frequency interference. It has emerged.

Referring to the factors in which the above-mentioned necessity arises with reference to FIG. 1, the most widely used method for using limited communication resources more efficiently and for many communication devices is communication resources such as specific time division and frequency division. After dividing into several to prevent interference between communication data.

As shown in FIG. 1 to which a plurality of entities use the same frequency (channel) in the above-described communication method, data communication is performed in the active area A of the duty cycle, and different in the sleeping area S. It is a method of yielding data communication to communication devices.

In FIG. 1, a waveform referred to as (a) indicates a duty cycle for data communication between high power wireless communication terminals, and a waveform referred to as (b) of FIG. 1 indicates a duty cycle for data communication between low power wireless communication terminals. Indicates.

In this case, when the frequency interference occurs, the communication data between the low power wireless communication terminals interfering with the high output wireless communication terminal is treated as simple noise, so that no problem occurs in actual data communication, but the reliability of the data is lost in the low output wireless communication terminal. Lose.

Therefore, as shown in (c) of FIG. 1, the data area that is actually communicated in the low power wireless communication terminal belongs to the time zone of the sleeping area of the data communication duty cycle between the high power wireless communication terminals, even though data is transmitted and received. Whether this data is actually valid is another matter.

That is, as shown in (d) of FIG. 1, only two valid data communications are performed in ten data transmission processes. In FIG. 1D, I denotes data communication failure due to frequency interference, V denotes valid communication success data, and F denotes recognition of transmission data (normal packet) due to frequency interference. This is not made in part refers to what is determined to be an error.

In particular, the cause of the communication error, called F, is that data transmitted for normal data communication is usually processed in the form of a packet, which includes data transmission start, transmission terminal, target terminal, data to be transmitted, and error recovery. This is because a large number of pieces of information indicating usage data, transmission completion, etc. are aggregated according to a specific rule, so that the receiving side can recognize the data when the whole is transmitted completely.

Therefore, in case of relatively high power communication terminals such as wireless LAN (IEEE802,11 a / b / g) or Bluetooth (IEEE802.15.1), which forms various communication networks using open frequency, frequency interference is prevented through channel switching. However, relatively low power communication terminals such as UWB (IEEE802.15.3a), USN (IEEE802.I5.4), etc., are mixed with the high power communication terminals in the same space. As can be seen, there is a problem that the data rate is extremely deteriorated.

Furthermore, as described above, wireless network terminals that want to use the open frequency band are rapidly flooded in the same space according to their purpose, such as UWB (IEEE802.15.3a), USN (IEEE802.I5.4), etc. Since the data transmission rate of the low power communication terminals will be worse, it is urgent to develop a frequency interference avoidance technique for improving the data transmission rate of the low power communication terminals.

An object of the present invention for solving the above problems relates to a method for avoiding frequency interference in a wireless network, in particular, when interference occurs during data communication between terminals in a wireless network using an industrial, scientific and medical equipment (ISM) frequency band. Adaptive Frequency Interference Avoidance Method According to Interference Frequency Duty for Scanning Frequency Duty Cycles Used in Heterogeneous Wireless Networks, In order to adaptively suppress occurrence of frequency interference by changing its duty cycle to an interference avoidable duty area To provide.

In order to achieve the above object, a feature of the adaptive frequency interference avoidance method according to the interference frequency duty according to the present invention is to transmit and receive packet type data at an active area time of a duty cycle of a certain period in a specific frequency band. In a method for the low power terminal to avoid frequency interference with the peripheral heterogeneous wireless terminal:
A first step of determining whether data transmission has failed due to deterioration of the surrounding frequency environment when a transmission failure occurs while performing communication at a set reference duty cycle; If it is determined that the cause of the data transmission failure in the first step is due to the deterioration of the surrounding frequency environment, after implementing the interference frequency check packet with the minimum amount of data necessary for data communication, a short corresponding to the amount of data of the packet is implemented. Forming a duty cycle having a period; And transmits an interference frequency inspection packet at an arbitrary time point based on the duty cycle formed in the second step, analyzes the types of transmission failure and transmission success, and recognizes the period of the region having interference with the surrounding frequency and the region without interference. In the third step, if it is determined that data transmission has failed due to deterioration of the surrounding frequency environment during data communication, a duty cycle having a short cycle corresponding to the size of the data after generating a packet type data with minimized transmission data Generating and transmitting a signal to recognize a surrounding frequency environment;
According to the surrounding frequency environment recognized through the first process, the duty cycle is set to the sleep state region of the interference cycle and the active cycle region is the duty cycle of the region not to interfere with the surrounding frequency. Setting, to generate a duty cycle of a specific period having an inverse phase of the recognized surrounding frequency environment; And
And a third process of generating data of a packet type having a data amount corresponding to the active state of the duty cycle generated in the second process and performing data communication.

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Advantageous effects due to the above-described features of the present invention include communication protocols such as wireless LAN (IEEE802, 11 a / b / g), Bluetooth (IEEE802.15.1), etc., which form various communication networks using open frequencies. In the case of relatively high power communication terminals according to the present invention, frequency interference is avoided through channel switching, but relatively low power communication terminals according to communication protocols such as UWB (IEEE802.15.3a), USN (IEEE802.I5.4), etc. In this case, it is possible to solve the problem that the data transmission rate is extremely deteriorated when mixed with the high power communication terminals in the same space.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Referring first to the technical idea applied to the present invention, the applicant of the present invention, if it is possible to recognize the period of the relative duty cycle in which interference occurs in the surrounding frequency environment, by adjusting its duty between the It was conceived that the type of data communication success referred to as V in d) could be sustained.

Therefore, a technique for recognizing the period of the duty cycle used in heterogeneous wireless networks in which frequency interference is generated should be presented in advance. For this purpose, existing UWB (IEEE802.15.3a), USN (IEEE802.I5.4), etc. Looking at the data transmission aspect of the same low-power communication terminal it was confirmed that it has the aspect as shown in (a) of FIG.

That is, a duty cycle for data communication is performed such that the active area A for data transmission and the sleeping area S in a resting state generally have a ratio of 1: 1, and data transmitted through the active area A is Is divided into a packet information area designated by reference numerals a1 and a2 and a transmission data region referred to by reference numeral D.

In this case, in the packet information area designated by reference numeral a1, information relating to a transmission start, a transmission terminal, and a target terminal is located, and information related to error recovery data and transmission completion is located in the packet information area called a2.

On the other hand, the transmission data area referred to by reference number D is an area where data to be actually transmitted exists, and when the amount of data to be transmitted is small, as shown in (b) of FIG. It was confirmed that a zero bit region, referred to as, has an aspect of filling in the active region A of the duty cycle by generating in the transmission data region d.

Therefore, in the conventional communication method, the entire transmission data area D is a zero bit area for matching the time of the transmission data d at the present time and the active area A of the duty cycle according to the amount of data to be transmitted. z) and adaptively change according to the amount of data to be transmitted.

Therefore, from the viewpoint of confirming only the transmission rate, only the packet information areas designated by reference numerals a1 and a2 may be transmitted and received. Therefore, after adjusting the duty cycle as shown in FIG. It can be used as a scanning signal to recognize.

At this time, since the period and width of the duty cycle shown in (c) of FIG. 2 can be recognized, if the transmission of the corresponding signal is successful, this means that there is no interference with neighboring frequency signals. By looking at the duty cycle signal that fails to communicate with the cycle signal, the surrounding frequency environment can be recognized.

Therefore, while performing communication with a normal duty cycle referred to by the reference number O according to the communication protocol in a normal state as shown in (b) of FIG. 3, a high-power communication terminal such as a laptop is shown in FIG. When communication is started as shown in (a), a communication failure occurs due to frequency interference such as referred to by reference numeral I in FIG.

When a communication failure occurs, a predetermined time is generated as shown in FIG. 3 (C) attached to the impulse as shown in FIG. Know the cycle.

Through this, when the area where the frequency interference occurs and the area without the frequency interference is recognized, the internal duty cycle is changed to generate a changed duty cycle referred to by reference numeral N in FIG. do.

In addition, when placed in a more complex frequency environment than in the case of FIG. 3 described above, when there are a plurality of high output communication terminals causing frequency interference, as in the case of the accompanying FIG. 4, the same method as in the case of FIG. After recognizing the surrounding frequency environment, communication is performed by generating an altered duty cycle referred to by reference numeral N in FIG.

The characteristics of the duty cycle changed through the adaptive frequency interference avoidance method according to the interference frequency duty according to the present invention described with reference to the cases illustrated in FIGS. 3 and 4 are mixed signals of the surrounding frequency environment, that is, the peripheral communication duty cycle signals. After determining the, change its communication duty cycle to have the reverse phase of the mixing signal.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone with it will know easily.

1 is an exemplary diagram for explaining a frequency interference phenomenon

2 is an exemplary diagram for explaining a data aspect of a transport packet of a low power wireless network terminal and the technical idea of the present invention;

3 and 4 are exemplary diagrams for explaining an adaptive frequency interference avoidance method according to the interference frequency duty according to the present invention.

Claims (3)

In a method in which a low power terminal transmitting and receiving packet type data at an active area time of a duty cycle of a certain frequency band avoids frequency interference with neighboring heterogeneous wireless terminals: A first step of determining whether data transmission has failed due to deterioration of the surrounding frequency environment when a transmission failure occurs while performing communication at a set reference duty cycle; If it is determined that the cause of the data transmission failure in the first step is due to the deterioration of the surrounding frequency environment, after implementing the interference frequency check packet with the minimum amount of data necessary for data communication, a short corresponding to the amount of data of the packet is implemented. Forming a duty cycle having a period; And transmits an interference frequency inspection packet at an arbitrary time point based on the duty cycle formed in the second step, analyzes the types of transmission failure and transmission success, and recognizes the period of the region having interference with the surrounding frequency and the region without interference. In the third step, if it is determined that data transmission has failed due to deterioration of the surrounding frequency environment during data communication, a duty cycle having a short cycle corresponding to the size of the data after generating a packet type data with minimized transmission data Generating and transmitting a signal to recognize a surrounding frequency environment; According to the surrounding frequency environment recognized through the first process, the duty cycle is set to the sleep state region of the interference cycle and the active cycle region is the duty cycle of the region not to interfere with the surrounding frequency. Setting, to generate a duty cycle of a specific period having an inverse phase of the recognized surrounding frequency environment; And Adaptive frequency interference according to the interference frequency duty characterized in that it comprises a third step of performing data communication by generating a packet type data having a data amount corresponding to the active state of the duty cycle generated in the second process How to avoid. delete delete

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