WO2011010755A1 - Procédé permettant d’éviter un brouillage de fréquence dans un réseau sans fil - Google Patents

Procédé permettant d’éviter un brouillage de fréquence dans un réseau sans fil Download PDF

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Publication number
WO2011010755A1
WO2011010755A1 PCT/KR2009/004033 KR2009004033W WO2011010755A1 WO 2011010755 A1 WO2011010755 A1 WO 2011010755A1 KR 2009004033 W KR2009004033 W KR 2009004033W WO 2011010755 A1 WO2011010755 A1 WO 2011010755A1
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WO
WIPO (PCT)
Prior art keywords
duty cycle
data
frequency
active area
interference
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PCT/KR2009/004033
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English (en)
Korean (ko)
Inventor
박현수
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(주)한울옵틱스
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Priority to PCT/KR2009/004033 priority Critical patent/WO2011010755A1/fr
Publication of WO2011010755A1 publication Critical patent/WO2011010755A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • the present invention relates to a method for avoiding frequency interference in a wireless network.
  • the present invention relates to a method for avoiding interference in data communication between terminals in a wireless network using an industrial, scientific and medical equipment (ISM) frequency band.
  • ISM industrial, scientific and medical equipment
  • the duty cycle can be adaptively suppressed by changing or mixing the duty cycle to the duty avoidable duty region.
  • the present invention relates to a method for avoiding frequency interference on a wireless network.
  • radio technology including electronic and communication technology
  • 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.
  • 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.
  • the low power wireless technology is further developed in the face of the ubiquitous society.
  • the service is expected to be further activated.
  • 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.
  • ISM Industrial Scientific Medical
  • UNI 5--Unlicensed Network Information Infrastructure
  • An object of the present invention for solving the above problems is directed to a method for avoiding frequency interference in a wireless network, and in particular, a duty for data communication between terminals on a wireless network in a wireless network using an industrial, scientific and medical equipment (ISM) frequency band. It is possible to reduce the probability of occurrence of frequency interference by reducing the active region in the duty cycle so that the ratio of the active state and the sleep state in the cycle has a ratio of 1: several tens to 1: hundreds by breaking the ratio of 1: 1. Scan the frequency duty cycle used in heterogeneous wireless networks to change the duty cycle to an interference avoidable duty area, or to change the duty cycle to an interference avoidable duty area while reducing the active area in the duty cycle.
  • Adaptive frequency interference To provide a frequency interference avoiding method in the wireless network for enabling to suppress it is an object.
  • a feature of the method for avoiding frequency interference in a wireless network according to the present invention for achieving the above object is that a low power terminal for transmitting and receiving a small amount of data in an active area time of a certain cycle duty cycle in a specific frequency band
  • a method of avoiding frequency interference with heterogeneous wireless terminals comprising: a ratio of an active state and a sleep state in a duty cycle of a data communication radio frequency of a low power terminal in a duty cycle so as to have a ratio of 1: several tens to 1: hundreds. The lower the active area is to transmit.
  • a method of avoiding frequency interference with peripheral heterogeneous wireless terminals comprising: a first step of setting a range of effective data communication success rates; A second step of setting an active area time of a critical range for transmitting and receiving effective data corresponding to the active area time of the terminal-specific reference communication duty cycle; A third step of determining whether there is frequency interference and having a data communication success rate outside the range of the communication success rate set in the first step; And if it is determined that the data communication success rate is degraded by the frequency interference through the third step, entering the communication success rate set in the first step based on the active area time of the terminal-specific reference communication duty cycle. And a fourth step of converging the active area time to the active area time of the threshold range set in the step.
  • a method of avoiding frequency interference with heterogeneous wireless terminals comprising: a first step of setting a range of effective data communication success rates; A second step of setting an active area time of a critical range for transmitting and receiving effective data corresponding to the active area time of the terminal-specific reference communication duty cycle; A third step of determining whether there is frequency interference and having a data communication success rate outside the range of the communication success rate set in the first step; And a fourth step of changing the active area time for data communication to the active area time of the threshold range set in the second step if it is determined that the success rate of data communication is reduced by frequency interference through the third step.
  • Another feature of the method for avoiding frequency interference in a wireless network according to the present invention for achieving the above object is a low power terminal for transmitting and receiving a small amount of data in the active area time of a certain duty cycle of a certain frequency band
  • a method for avoiding frequency interference with heterogeneous wireless terminals comprising: a first step of setting an active region time of a critical range for transmitting and receiving effective data in response to an active region time of a terminal-specific reference communication duty cycle; ; And a second step of setting the active area time of the threshold range set in the first step to the active area time of the duty cycle for data communication.
  • a feature of the method of avoiding frequency interference in a wireless network according to the present invention for achieving the above object is that a low power terminal for transmitting and receiving packet type data at an active area time of a duty cycle of a certain period in a specific frequency band
  • a method of avoiding frequency interference with heterogeneous wireless terminals When data transmission is determined to be unsuccessful due to deterioration of the surrounding frequency environment during data communication, after generating packet type data with minimized transmission data, A first step of generating and transmitting a duty cycle having a short period corresponding to the magnitude to recognize an ambient frequency environment; 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 step of generating data of a packet type having a data amount corresponding to the active state of the duty cycle generated in the second step and performing data communication.
  • An additional feature of the method for avoiding frequency interference in a wireless network according to the present invention for achieving the above object is that, in the first process, if a transmission failure occurs while performing communication with a set reference duty cycle, Determining whether data transmission failed due to a first step; 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.
  • An additional feature of the method for avoiding frequency interference in a wireless network according to the present invention for achieving the above object is that the second process is the interference with the surrounding frequency according to the ambient frequency environment recognized through the first process.
  • Another feature of the method for avoiding frequency interference in a wireless network according to the present invention for achieving the above object is a low power terminal for transmitting and receiving a small amount of data in the active area time of a certain duty cycle of a certain frequency band
  • a method for avoiding frequency interference with neighboring heterogeneous wireless terminals comprising: a duty cycle such that a ratio of an active state and a sleep state in a duty cycle of a data communication radio frequency of a low power terminal has a ratio of 1:10 to 1: 100 Setting a low active area at and transmitting the signal; If it is determined that the data transmission has failed due to the deterioration of the surrounding frequency environment during the data communication through the first process, after generating the packet type data with the minimum transmission data, a duty cycle having a short period corresponding to the size of the data is performed.
  • a second step of generating and transmitting a peripheral frequency environment A third 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 second process; And a fourth step of continuously transmitting a duty cycle to a low active region transmitted in the first process and a sleep region corresponding to 1: 1 when the duty cycle is active generated in the third process. .
  • Another feature of the method for avoiding frequency interference in a wireless network according to the present invention for achieving the above object is a low power terminal for transmitting and receiving a small amount of data in the active area time of a certain duty cycle of a certain frequency band
  • a method for avoiding frequency interference with neighboring heterogeneous wireless terminals comprising: a duty cycle such that a ratio of an active state and a sleep state in a duty cycle of a data communication radio frequency of a low power terminal has a ratio of 1:10 to 1: 100 Setting a low active area at and transmitting the signal; If it is determined that the data transmission has failed due to the deterioration of the surrounding frequency environment during the data communication through the first process, after generating the packet type data with the minimum transmission data, a duty cycle having a short period corresponding to the size of the data is performed.
  • a second step of generating and transmitting a peripheral frequency environment A third 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 second process; And a fourth step of generating data of a packet type having a data amount corresponding to the active state of the duty cycle generated in the third step and performing data communication.
  • the first step includes: setting a range of effective data communication success rates; A second step of setting an active area time of a critical range for transmitting and receiving effective data corresponding to the active area time of the terminal-specific reference communication duty cycle; A third step of determining whether there is frequency interference and having a data communication success rate outside the range of the communication success rate set in the first step; And if it is determined that the data communication success rate is degraded by the frequency interference through the third step, entering the communication success rate set in the first step based on the active area time of the terminal-specific reference communication duty cycle. And a fourth step of converging the active area time to the active area time of the threshold range set in the step.
  • the first step includes: setting a range of effective data communication success rates; A second step of setting an active area time of a critical range for transmitting and receiving effective data corresponding to the active area time of the terminal-specific reference communication duty cycle; A third step of determining whether there is frequency interference and having a data communication success rate outside the range of the communication success rate set in the first step; And a fourth step of changing the active area time for data communication to the active area time of the threshold range set in the second step if it is determined that the success rate of data communication is reduced by frequency interference through the third step.
  • a method for avoiding frequency interference in a wireless network wherein the first process is to transmit and receive effective data in response to an active area time of a terminal-specific reference communication duty cycle.
  • the second process is a deterioration of the surrounding frequency environment when a transmission failure occurs during communication with a set duty cycle Determining whether data transmission has failed due to the first step; 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.
  • the interference frequency check packet is transmitted at an arbitrary time point and the types of transmission failure and transmission success are analyzed to recognize the period of the region having interference with the surrounding frequency and the region without interference.
  • the third step To include the third step.
  • the third process is interference with the surrounding frequency according to the surrounding frequency environment recognized through the fourth process.
  • 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.
  • communication protocols such as wireless LAN (IEEE802, 11 a / b / g), Bluetooth (IEEE802.15.1), etc.
  • UWB IEEE802.15.3a
  • USN IEEE802.I5.4
  • communication protocols such as wireless LAN (IEEE802,11 a / b / g), Bluetooth (IEEE802.15.1), etc. to form a variety of communication networks using the open frequency
  • communication protocols such as UWB (IEEE802.15.3a), USN (IEEE802.I5.4), etc.
  • UWB IEEE802.15.3a
  • USN IEEE802.I5.4
  • the data transmission rate may be extremely deteriorated when mixed with the high power communication terminals, and the ratio of the active area of the duty cycle, which consumes a lot of power, may be reduced, thereby implementing a low power system. Has an effect.
  • 1 is an exemplary diagram for explaining a frequency interference phenomenon
  • FIG. 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
  • FIG 3 is an exemplary view for explaining an effect obtained when applying the method of avoiding frequency interference in a wireless network according to the present invention.
  • FIG. 7 and 8 are exemplary diagrams for explaining another embodiment of the method for avoiding frequency interference in a wireless network according to the present invention.
  • a wireless network characterized by setting the active area in the duty cycle low so that the ratio of the active state and the sleep state in the duty cycle of the data communication radio frequency of the low power terminal has a ratio of several tens to one hundred.
  • a method of avoiding frequency interference of a phase is presented.
  • the technical idea applied to the present invention is examined by examining the factors causing the problems of the prior art.
  • the most commonly used method is a specific time division and frequency division. After classifying the communication resources into several, such as to prevent the interference between the communication data.
  • 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.
  • a waveform referred to as (AA) represents a duty cycle for data communication between high power wireless communication terminals
  • a waveform referred to as (AB) in FIG. 1 represents a duty cycle for data communication between low power wireless communication terminals.
  • 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.
  • 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.
  • I data communication failure due to frequency interference
  • V represents valid communication success data
  • F 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.
  • the cause of the communication error 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.
  • 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.
  • the applicant of the present invention has improved the type of data communication failure referred to as F, even though the type of data communication failure referred to as I in FIG. 1 (AD) has been improved. .15.3a), the data transmission aspects of low-power communication terminals such as USN (IEEE802.I5.4) and the like have been found to have an aspect as shown in FIG.
  • 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.
  • 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.
  • the entire transmission data area D is composed of a zero bit area z 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.
  • the amount of data to be transmitted is adaptively changed.
  • networks made by communication protocols such as UWB (IEEE802.15.3a) and USN (IEEE802.I5.4) show differences in data transmission depending on the purpose of implementation and characteristics of terminals.
  • the applicant of the present invention erases the zero bit region z that does not have an actual data value, as shown in (BC) of FIG.
  • the effective data areas referred to as a1 and a2 and the actual transmission data d are brought into close or close proximity to each other so as to reduce the width of the duty occupied by the active area A 'in a duty cycle having a certain period.
  • the example applied in the situation as shown in FIG. 1 is a method of removing the zero bit region (b) that wastes resources without the actual data and reducing the width of the duty occupied by the active region in the duty cycle. As shown in FIG. 3.
  • the waveform of the signal shown in (CB) of FIG. 3 is modified to reduce the width of the duty occupied by the active region A in the waveform of the signal shown in (AB) of FIG. Compared with FIG. 1, it can be seen that the data transmission success rate is doubled.
  • the threshold range for transmitting and receiving active data A 'that erases or reduces a zero bit area z having no actual data value is determined.
  • an active area time hereinafter referred to as a critical active area.
  • the first thing to be implemented in advance is to set a range of effective data communication success rates.
  • the data communication success rate having effectiveness for the entire network to operate normally in the network formed by the communication protocol of IEEE802.15.4 is 40% to 65%.
  • the data communication success rate (hereinafter referred to as a critical transmission rate) having minimum effectiveness should be defined.
  • zero bit areas z having no actual data values are erased or abbreviated as referred to by reference numerals a1 and a2. It is necessary to define the value of the low duty cycle in which the valid data area and the actual transmission data d are in close or close proximity.
  • the width (or data amount) of the actual transmission data area referred to by the reference number d is based on the minimum amount of transmission data for maintaining the communication network.
  • the first method to implement the technical idea of the present invention is to maintain the state of the reference duty cycle as shown in FIG.
  • the zero bit area z shown in FIG. 2 (BB) is gradually reduced to decrease the data communication success rate above the threshold transmission rate until FIG. 2 is detected.
  • the initializing operation of the system initially maintains the state of the reference duty cycle as shown in FIG. 2 (BA), and is later than the critical transmission rate due to the surrounding frequency interference according to the surrounding communication environment.
  • BA the state of the duty cycle is unconditionally changed to the critical active region A 'illustrated in FIG.
  • the third method is to initially fix the duty cycle to the critical active region A 'in the initial operation of the system.
  • FIG. 4 assumes a high-power communication terminal causing frequency interference as a wireless LAN, and when the separation distance between the wireless LAN and the low-power communication terminal to which the frequency interference avoidance method according to the present invention is applied is within 0.3m, as the duty ratio is changed.
  • the loss rate is shown in a table.
  • FIG. 5 assumes a high-power communication terminal causing frequency interference as a wireless LAN, and appears as the duty ratio is changed when the separation distance between the wireless LAN and the low-power communication terminal to which the frequency interference avoidance method according to the present invention is applied is within 4 m.
  • the loss rate is a table.
  • FIG. 4 and FIG. 5 are arranged in a graph, as shown in FIG. 6.
  • the communication error rate increases and the communication speed decreases.
  • the duty cycle is reduced to about 1%, the communication error rate can be sufficiently maintained at about 4%. Therefore, when receiving interference by the WLAN around, it was possible to sufficiently avoid interference with a low duty cycle.
  • the duty cycle was lowered to less than 1% in the USN using the 100% duty cycle, and the interference avoidance with the WLAN using the low duty cycle was found. .
  • the method using the low duty cycle as described above is based on the duty cycle in which data transmission is performed when the surrounding frequency environment is extremely deteriorated, that is, when high power communication terminals generating frequency interference are mixed in a certain space. If the active area is lowered to less than 1% and the amount of data to be transmitted is high in such a low duty cycle, the corresponding data is divided and transmitted and the receiving side recognizes it by combining them. As a result, there is a problem that a time delay may occur.
  • 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 the duty between its own from (AD) to FIG. It was conceived that the type of data communication success referred to could continue to be maintained.
  • a technique for recognizing a cycle of a duty cycle used in a heterogeneous wireless network in which frequency interference is generated should be presented in advance. For this purpose, only a transmission rate is confirmed in a waveform obtained by analyzing packet information shown in FIG. In view of this, it has been recognized that only packet information areas designated by reference numerals a1 and a2 may be transmitted and received.
  • the corresponding duty cycle signal is like an impulse signal. It can be used as a scanning signal to recognize the surrounding frequency environment.
  • a high-power communication terminal such as a laptop is shown in FIG.
  • communication failure occurs due to frequency interference such as referred to by reference numeral I in FIG. 7 (DD) due to frequency interference.
  • the communication success interval is generated by generating a predetermined time as shown in (DC) of FIG. 7 to which a modified duty cycle close to a signal is attached to an impulse as shown in (BD) of FIG. 2. And the cycle.
  • the characteristics of the duty cycle changed through the frequency interference avoidance method in the wireless network according to the present invention as described above with reference to the cases illustrated in FIGS. 7 and 8 correspond to an ambient frequency environment, that is, a mixed signal of peripheral communication duty cycle signals. It has changed its communication duty cycle to have the reverse phase of the mixed signal.
  • a method of scanning and recognizing the surrounding frequency environment and utilizing the duty signal having the mixed inverse phase of the surrounding frequency environment may be used in combination with the above-described low duty cycle, and may be used in practice. Experimentally confirmed that the efficiency is excellent.
  • the present invention can implement a reliable network by applying to wireless networks in the UWB (IEEE802.15.3a) or USN (IEEE802.I5.4) field utilizing the industrial, scientific and medical equipment (ISM) frequency band.
  • UWB IEEE802.15.3a
  • USN IEEE802.I5.4
  • ISM industrial, scientific and medical equipment

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé destiné à éviter un brouillage de fréquence dans un réseau sans fil et, plus particulièrement, un procédé permettant d'éviter un brouillage de fréquence dans un réseau sans fil utilisant des bandes de fréquence ISM (industrielle, scientifique et équipement médical). L'invention peut : réduire la probabilité de génération de brouillages de fréquence en diminuant une région active dans un facteur d’utilisation de façon à ce que l'état actif et l’état de veille puissent avoir des rapports de 1:10 à 1:100, au lieu d'avoir les rapports existants 1:1, dans le facteur d’utilisation pour une communication de données entre des terminaux dans le réseau sans fil ; modifier le facteur d’utilisation correspondant en une zone d’utilisation à brouillages évitables en balayant les facteurs d’utilisation de fréquence utilisés dans des réseaux sans fil hétérogènes à partir desquels le brouillage est généré ; ou supprimer de façon adaptative la génération de brouillages de fréquence par la réduction de la région d'action dans le facteur d’utilisation en modifiant le facteur d’utilisation correspondant dans la zone d’utilisation à brouillages évitables.
PCT/KR2009/004033 2009-07-21 2009-07-21 Procédé permettant d’éviter un brouillage de fréquence dans un réseau sans fil WO2011010755A1 (fr)

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Cited By (2)

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US9107079B2 (en) 2012-03-23 2015-08-11 Samsung Electronics Co., Ltd. Ultra-low power wireless communication apparatus and method
US9706923B2 (en) 2014-02-25 2017-07-18 General Electric Company System and method for adaptive interference mitigation in wireless sensor network

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WO2007031554A1 (fr) * 2005-09-16 2007-03-22 Sony Ericsson Mobile Communications Ab Procedes, dispositifs electroniques et produits de programme informatique permettant de coordonner une communication bluetooth et une communication de reseau local sans fil
US20070259662A1 (en) * 2006-04-26 2007-11-08 Qualcomm Incorporated Wireless device communication with multiple peripherals
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9107079B2 (en) 2012-03-23 2015-08-11 Samsung Electronics Co., Ltd. Ultra-low power wireless communication apparatus and method
US9706923B2 (en) 2014-02-25 2017-07-18 General Electric Company System and method for adaptive interference mitigation in wireless sensor network

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