KR101675735B1 - System for controlling guide busy tone singal for zigbee coexistence under wifi interference - Google Patents
System for controlling guide busy tone singal for zigbee coexistence under wifi interference Download PDFInfo
- Publication number
- KR101675735B1 KR101675735B1 KR1020150154033A KR20150154033A KR101675735B1 KR 101675735 B1 KR101675735 B1 KR 101675735B1 KR 1020150154033 A KR1020150154033 A KR 1020150154033A KR 20150154033 A KR20150154033 A KR 20150154033A KR 101675735 B1 KR101675735 B1 KR 101675735B1
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- South Korea
- Prior art keywords
- gbt
- busy tone
- signal
- zigbee
- wifi
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- H04W28/044—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
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- H04W28/048—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
Abstract
Description
The present invention relates to a guide bus tone (GBT) signal control method capable of providing a reliable communication environment in a Zigbee network even in a Wi-Fi interference situation in a saturated state.
Zigbee is a core technology of IoT, which is a wireless sensor network (WSNs) and wireless sensor networks (WSNs) monitoring system It is getting attention for implementation.
However, as various heterogeneous devices such as Wi-Fi, Bluetooth, RFID, etc. using an unlicensed band of 2.4 GHz are increasing, coexistence is difficult.
In particular, the number of heterogeneous devices using Industrial Scientific Medical (ISM) bands is increasing, and the increasing use of mobile terminals and the unreasonable use of communication frequencies will lead to serious performance degradation.
In particular, network operators are urged to use the ISM band to distribute large mobile traffic, which is expected to be severely degraded due to the indiscriminate use of frequency resources by many wireless nodes in the future IoT field .
As shown in FIG. 1, when a Wi-Fi node used as an alternative for reducing mobile traffic and Internet data usage increasingly uses the same frequency band as that of ZigBee and neighboring places, not only a mutual interference problem but also a serious Resulting in performance degradation.
In order to solve such problems, frequency hopping and CSMA / CA algorithms according to the related art have been proposed, but they are still vulnerable to mutual interference problems in heterogeneous networks.
This is because the elements in the PHY / MAC layer between Wi-Fi and ZigBee are asymmetric, such as clear channel assessment (CCA) time for channel competition, transmission power, and transmission / reception switching time.
Cooperative Busy Tone (CBT) and light-weight Narrow Band Protection (NBP), which are solutions according to the prior art, have been proposed in order to overcome the limitations of CSMA. However, (Idle time), it can not be applied in a congested channel environment because it can not perform channel reservation (busy tone transmission) because idle time is not secured. There is a problem that it is dependent on the transmission time and the optimal design is not presented for the channel competition with the Wi-Fi node.
SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for reducing the frequency waste, using in a congested channel environment, including an optimal design element capable of coexistence of ZigBee in a Wi- The aim is to provide a guide-tone signal control system for ZigBee coexistence in Wi-Fi impact.
The guide tone signal control system for coexistence of ZigBee in the Wi-Fi effect according to the present invention includes a busy tone signaler for transmitting a GBT signal according to at least one of preset transmission power, frequency and time control, And a busy tone canceling section for preventing interference.
The guide busy tone signal control system for coexistence of ZigBee in the Wi-Fi effect according to the present invention has the effect of enabling stable communication of ZigBee under the influence of the saturated WiFi.
It is possible to provide a communication environment that guarantees full PDR (Pacjet Delivery Ratio) without packet collision and interference with Wi-Fi to Zigbee using the same bandwidth by ensuring sufficient GBT power and eliminating magnetic interference due to busy tone. And enables coexistence between heterogeneous protocols.
The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.
1 is a diagram illustrating a channel interference problem between a ZigBee and a WiFi according to the prior art.
FIG. 2 is a block diagram illustrating a guide busy tone signal control system for coexistence of ZigBee in a Wi-Fi effect according to an embodiment of the present invention.
3 is a block diagram illustrating a busy tone signaler according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating an analysis result of GBT power according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a channel configuration of a Wi-Fi and a ZigBee and a PSD mask according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a GBT time domain in a Wi-Fi environment according to an embodiment of the present invention.
7 is a diagram showing a busy tone spectrum before and after the deconcentration according to the embodiment of the present invention.
FIG. 8 is a diagram illustrating a ZigBee PDR (Packet Delivery Ratio) according to the embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, advantages and features of the present invention and methods of achieving them will be apparent from the following detailed description of embodiments thereof taken in conjunction with the accompanying drawings.
The present invention may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, And advantages of the present invention are defined by the description of the claims.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited component, step, operation, and / Or added.
According to an embodiment of the present invention, a GBT signal for changing the channel state from idle to busy is intentionally transmitted for reservation of a channel, so that the reception-transmission switching period of the weak Zigbee from the Wi-Fi interference and the long CCA interval It is possible to prevent packet collision.
A system according to an embodiment of the present invention comprises a busy tone signaler and a busy tone canceler (including a plurality of antennas and a canceller).
FIG. 2 is a block diagram illustrating a system according to an embodiment of the present invention. The busy
FIG. 3 is a block diagram illustrating a busy
Hereinafter, the signaling system will be described in detail from the viewpoints of the
Hereinafter, a
Generally, Zigbee communication causes serious degradation in the asymmetric region formed by ZigBee, which has a relatively low transmission power, compared with a symmetric zone in which signals are detected with Wi-Fi.
Therefore, the GBT transmission power according to the embodiment of the present invention should notify the Wi-Fi node of the presence of ZigBee and make the Wi-Fi back-off state by reaching the power of CCA threshold value or more.
If the received power at the WiFi Tx node is β B , it should have a value higher than the CCA threshold value P Wth .
[Equation 1]
However, since the use of excessive power causes power dissipation and interference to Wi-Fi nodes in adjacent channels, the
At this time, as shown in the following formula (2), the minimum amount of transmission power α B considering the attenuation of the distance can be obtained. FIG. 4 is a diagram showing the analysis result of the GBT power.
&Quot; (2) "
Hereinafter, the
5 is a diagram showing a channel configuration of a Wi-Fi and a Zigbee and a PSD mask.
The channel frequency used by the Wi-Fi and ZigBee protocols is shown in FIG. 3, and the center frequency of the Wi-Fi is 2407 + 5n, where n is a natural number from 1 to 11 and the center frequency of the ZigBee is 2405 + 5 (n-1) Where n is a natural number from 11 to 26.
The GBT signal must achieve minimum interference and maximum power transmission at nearby frequencies.
The
Hereinafter, a
FIG. 6 is a diagram illustrating a GBT time domain in a Wi-Fi environment. Referring to FIG. 6, a starting point of a ZigBee CCA for successful transmission is as follows.
&Quot; (3) "
When a GBT signal is transmitted during Wi-Fi data transmission, it is preferable that the ZigBee CCA is performed after a collision period (vulnerable period), and a potential collision interval is as shown in the following Equation (4).
&Quot; (4) "
In the above description, the
Hereinafter, the busy
When a GBT signal is transmitted from a ZigBee node to prevent WiFi interference, a self interference problem occurs in which a ZigBee node can not receive signals from other nodes.
According to an embodiment of the present invention, in order to solve such a problem, it includes a busy
In accordance with an embodiment of the present invention, analog desensitization is performed using a polarization-wise and balun technique that utilizes the polarization of the antenna.
FIG. 7A is a diagram showing the desynchronization of the busy tone spectrum, and FIG. 7B is a diagram showing the desynchronization after the busy tone spectrum.
According to the embodiment of the present invention, a performance of 28 to 50 dB is obtained by using the gap between the antennas and the polarization effect, and 30 to 40 dB by the analog attenuation using the balun technique.
According to the related art, there is a problem that transmission time is dependent. According to the embodiment of the present invention, there is an effect that the constraint on the busy tone transmission time is solved according to the deconcentration.
FIG. 8 is a diagram illustrating a ZigBee PDR (Packet Delivery Ratio) with respect to the CP ratio. In accordance with an embodiment of the present invention, a ZigBee communication environment that guarantees a complete PDR (Pacjet Delivery Ratio) .
The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.
100: busy tone signal 110: power control unit
120: Frequency control unit 130: Time control unit
200: busy tone transmission unit 300: Zigbee receiving node
400: busy tone canceling unit 410: antenna
420:
Claims (8)
A frequency controller for controlling the bandwidth of the GBT signal to a preset bandwidth; And
A time control unit for determining a time point at which the busy tone signal is transmitted after the data transmission time of the WiFi and the sum value of the WiFi air time,
/ RTI >
The power control unit
Controlling the amount of transmission power considering the power reduction according to the distance between the WiFi node and the GBT
Invisible tone signal.
And the power control unit sets and controls the transmission power amount equal to or greater than a sum of the CCA threshold value and the power attenuation
Invisible tone signal.
The frequency controller may set the bandwidth of the GBT signal to a bandwidth of 1 to 2 Hz
Invisible tone signal.
A busy tone canceling section for preventing magnetic interference at the time of transmitting the GBT signal,
A guide tone signal control system for the coexistence of ZigBee in WiFi impact, including.
The busy tone signal includes a transmission power set in consideration of a power attenuation according to a distance between a WiFi node and a GBT, a frequency of a GBT signal set to a predetermined bandwidth, a busy tone signal after a data transmission time of a Wi- And transmitting the busy tone signal using at least one of the characteristics
A guide tone signal control system for ZigBee coexistence in WiFi impact.
Wherein the busy tone canceling section comprises a plurality of antennas having a polarization characteristic and a kensler using a balun technique
A guide tone signal control system for ZigBee coexistence in WiFi impact.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100653368B1 (en) * | 2005-12-14 | 2006-12-05 | (주)한국무선네트워크 | Apparatus and method of avoiding mutual interaction between wireless lan and zigbee |
| KR20120130110A (en) * | 2011-05-20 | 2012-11-29 | 한국전자통신연구원 | Channel selection and communication method for considering interference of wifi in multi cannel wireless sensor network |
| KR20130009489A (en) * | 2011-07-15 | 2013-01-23 | 엘지전자 주식회사 | Apparatus and method for avoiding interference between zigbee channel and wi-fi channel in a single device or a single system |
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2015
- 2015-11-03 KR KR1020150154033A patent/KR101675735B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100653368B1 (en) * | 2005-12-14 | 2006-12-05 | (주)한국무선네트워크 | Apparatus and method of avoiding mutual interaction between wireless lan and zigbee |
| KR20120130110A (en) * | 2011-05-20 | 2012-11-29 | 한국전자통신연구원 | Channel selection and communication method for considering interference of wifi in multi cannel wireless sensor network |
| KR20130009489A (en) * | 2011-07-15 | 2013-01-23 | 엘지전자 주식회사 | Apparatus and method for avoiding interference between zigbee channel and wi-fi channel in a single device or a single system |
Non-Patent Citations (1)
| Title |
|---|
| Jinwoo Ock, et al., Performance Analysis of Periodic Busy Tones Protecting a Zigbee Network for Wi-Fi Interruption, 2014 IEEE VTC, 2014.05.21..* * |
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