CN110351816B - Internet of things node awakening receiving device and awakening method thereof - Google Patents
Internet of things node awakening receiving device and awakening method thereof Download PDFInfo
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- CN110351816B CN110351816B CN201910456677.9A CN201910456677A CN110351816B CN 110351816 B CN110351816 B CN 110351816B CN 201910456677 A CN201910456677 A CN 201910456677A CN 110351816 B CN110351816 B CN 110351816B
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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
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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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
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
- H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
- H04W52/028—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an Internet of things node awakening receiving device and an awakening method thereof. In a monitoring mode, the low-noise amplifier is short-circuited, the wake-up circuit is powered on intermittently to work, and in a receiving mode, the low-noise amplifier is started, and the wake-up circuit works continuously; the invention effectively reduces the power consumption of the awakening receiving device under the condition of not sacrificing the sensitivity of the awakening receiving device.
Description
Technical Field
The invention belongs to the technical field of awakening of Internet of things nodes such as wireless sensor nodes and body area network nodes, and particularly relates to an Internet of things node awakening receiving device and an awakening method thereof.
Background
The common awakening method for the nodes of the Internet of things such as the wireless sensor nodes and the body area network nodes mainly comprises external trigger awakening and internal timing awakening. The external triggered Wake-up usually employs radio Wake-up, that is, the node is woken up by using an external radio signal, which is a Wake-up-on-demand mechanism, and the node receives and demodulates the radio Wake-up signal by using a radio Wake-up Receiver (Wake-up Receiver). Since the wake-up receiving apparatus needs to be in a working state all the time and its receiving sensitivity limits the communication distance of the node, it is required to have the characteristics of high sensitivity and low power consumption. At present, the average power consumption of a wake-up receiving device is required to be lower than 100 μ W in a typical wireless sensor network working environment, but the power consumption of a traditional super heterodyne type equal-radio receiver is too high, and the sensitivity of a super low-power passive envelope detection receiver cannot meet the system application requirements. Therefore, the technology of the wake-up receiving device with high sensitivity and low power consumption is a research hotspot in the fields of WSN, body area network, active/semi-active RFID and the like.
"A3- μ W868-MHz Wake-Up Receiver with-83dBm Sensitivity and Scalable Data Rate" European Solid-state Circuits Conference (ESCIRC) discloses a Wake-Up Receiver that operates intermittently, i.e., the Receiver is periodically turned on/off at high speed to operate in a low duty cycle mode, "looks for" a Wake-Up signal in the on state, and enters the sleep state when turned off.
As shown in fig. 1, the intermittently operating wake-up receiving apparatus mainly includes a low noise amplifier, a mixer, an oscillator, an envelope detector, a comparator, a pulse controller, a filter, and the like. The work of the awakening receiving device is controlled by a pulse controller, and the receiver works intermittently through a high-speed switch. As can be seen from the sampling diagram shown in fig. 2, the on-time of the receiving device is much shorter than the off-time of the receiving device in one cycle, and there are about four wake-up cycles for one data bit.
However, the wake-up receiver shown in fig. 1 has many disadvantages such as mixing the rf signal to the if demodulation, and using the rf amplifier, the if amplifier and the oscillator, which all result in large total power consumption.
"A New Approach to Low-Power and Low-Latency Wake-Up Receiver System for Wireless Sensor Nodes" (IEEE International Solid-State Circuit Conference dictionary of technical Papers (JSSC),2012) discloses a Wake-Up Receiver having two modes of operation: a listening mode and a receiving mode. As shown in fig. 3, the wake-up receiving apparatus mainly includes an amplifier, an envelope detector, an analog-to-digital converter, and a control circuit. In a general state, a switch of the wake-up receiving device is controlled by a control circuit, namely, the wake-up receiving device is periodically wakened up, the wake-up receiving device is started to search for a wake-up signal after a certain time, and after starting frame data of a wake-up packet is detected, the control circuit can enable the switch to be closed and not disconnected any more, namely, the data receiving mode is entered.
Fig. 4 is a timing diagram of the wake-up receiver of fig. 3 in two operating modes, where Rx indicates the main receiver, WuRx indicates the wake-up receiver, and Tx indicates the transmitter, and the wake-up receiver is in a sleep mode until the main receiver is not activated by the wake-up signal for waking up the receiver, during which time the wake-up receiver is in an operating state. The transmitter, prior to transmitting the communication data, transmits a wake-up packet to confirm the receiver status, the wake-up packet essentially comprising two parts: the start frame and the node ID data correspond to the two parts, and the awakening receiving device has two working modes: a listening mode and a receiving mode. The monitoring mode adopts periodic wake-up, and makes the wake-up receiving device work under low duty ratio, and is used for monitoring the start frame part in the wake-up packet sent by the transmitter. When the start frame part of the awakening packet is monitored, the awakening receiving device enters a receiving mode, and the awakening receiving device stops periodical awakening and is in a constantly-on state.
However, the wake-up receiving apparatus shown in fig. 3 has a large total power consumption because the amplifier with the largest power consumption is always in the on state.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an apparatus and a method for waking up a node of an internet of things, which effectively reduce power consumption of a wake-up receiving apparatus without sacrificing sensitivity of the wake-up receiving apparatus.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a thing networking node awakens receiving arrangement up, includes enable control circuit and awaken circuit up, and the controlled end of awakening circuit is connected to enable control circuit output, and awaken circuit input receives the package of awakening up of outside transmitter transmission through the antenna.
Furthermore, the enabling control circuit comprises a clock counting circuit and a logic circuit, wherein the clock counting circuit is connected with the input end of the logic circuit, and the output end of the logic circuit is provided with a comparator connecting end, an EN enabling end, an S1 enabling end and an S2 enabling end;
the wake-up circuit comprises a matching network, a low noise amplifier, an envelope detector, a baseband amplifier and a comparator which are sequentially connected in series, power supply loops of the matching network, the envelope detector, the baseband amplifier and the comparator are all connected in series with a switch EN, a switch S2 is connected in series in the power supply loop of the low noise amplifier, and two ends of the low noise amplifier are connected in parallel with a switch S1;
the comparator connecting end is connected with the comparator, the EN enabling end is used for controlling the on-off of the switch EN, the S2 enabling end is used for controlling the on-off of the switch S2, and the S1 enabling end is used for controlling the on-off of the switch S1.
The invention also discloses a wake-up method based on the internet of things node wake-up receiving device, which comprises the following steps:
A. the awakening receiving device receives an awakening packet transmitted by an external transmitter through an antenna; the wake-up packet comprises a start frame and node ID data;
B. awakening the receiving device to enter a monitoring mode, and intermittently electrifying the awakening circuit to work in a period of T and circularly monitoring whether the start frame of the awakening packet exists or not; wherein T < T, T representing the start frame duration;
in the listening mode, the EN enable control switch EN is intermittently turned on and off at a period of T, the S2 enable control switch S2 is turned off, and the S1 enable control switch S1 is turned on. At the moment, the low-noise amplifier is short-circuited, the matching network, the envelope detector, the baseband amplifier and the comparator of the wake-up circuit are periodically electrified, and the receiving device is awakened to detect a starting frame;
C. after detecting a start frame, the wake-up receiving device is switched to a data receiving mode, in the mode, an EN enabling end control switch EN is closed, an S2 enabling end control switch S2 is closed, an S1 enabling end control switch S1 is opened, a matching network, a low noise amplifier, an envelope detector, a baseband amplifier and a comparator in a wake-up circuit are all electrified to work, in the receiving mode, a clock counting circuit stops working, and the periodic intermittent electrification work of the wake-up circuit stops;
further, the period T includes a receiving device enabling time Ton and a receiving device sleeping time Toff; the switch EN is turned on during the receiver enable time Ton, and the switch EN is turned off during the receiver sleep time Toff.
Further, T is 900 μ s, and T is 1 ms.
The invention has the beneficial effects that:
1. the low-noise amplifier is independently controlled by the enabling control circuit, so that the low-noise amplifier is turned off in a monitoring mode, other modules of the awakening circuit are periodically turned on, the receiving sensitivity of the awakening receiving device is ensured, the low-noise amplifier is turned on only when receiving data, and the power consumption of the awakening receiving device is effectively reduced.
2. The EN enabling end, the S1 enabling end and the S2 enabling end of the enabling control circuit respectively control the on-off of each module switch of the wake-up circuit, so that the working state of each module in the wake-up circuit is controlled, the low-noise amplifier can be automatically switched to a power-on working state and a short-circuit working state, meanwhile, the clock counting module can stop counting in a receiving mode, and the power consumption of the wake-up receiving device is reduced to the maximum extent;
3. by adopting the awakening method formed by monitoring and receiving and matching with the switching of the low-noise amplifier in the two states, the sensitivity of the receiver is ensured, and the power consumption of the awakening receiving device is greatly reduced.
Drawings
FIG. 1 is a block diagram schematically illustrating a structure of a first prior art;
FIG. 2 is a timing diagram of FIG. 1;
FIG. 3 is a block diagram schematically illustrating a structure of a second prior art;
FIG. 4 is a timing diagram of FIG. 3;
FIG. 5 is a block diagram of the structure of the present invention;
FIG. 6 is a timing diagram of FIG. 5;
FIG. 7 is a flowchart illustrating a wake-up method according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 5, the invention discloses an internet of things node wake-up receiving device, which comprises an enable control circuit and a wake-up circuit, wherein an output end of the enable control circuit is connected with a controlled end of the wake-up circuit.
The enabling control circuit comprises a clock counting circuit and a logic circuit, the clock counting circuit is connected with the input end of the logic circuit, and the output end of the logic circuit is provided with a comparator connecting end, an EN enabling end, an S1 enabling end and an S2 enabling end;
the wake-up circuit comprises a matching network, a low-noise amplifier, an envelope detector, a baseband amplifier and a comparator which are sequentially connected in series, power supply loops of the matching network, the envelope detector, the baseband amplifier and the comparator are all connected in series with a switch EN for controlling the on-off of the corresponding power supply loop, a switch S2 for controlling the on-off of the power supply loop of the low-noise amplifier is connected in series in the power supply loop of the low-noise amplifier, and two ends of the low-noise amplifier are connected in parallel with a switch S1 for controlling the short circuit of the low-noise amplifier;
the comparator connecting end is connected with the comparator, the EN enabling end is used for controlling the on-off of the switch EN, the S2 enabling end is used for controlling the on-off of the switch S2, and the S1 enabling end is used for controlling the on-off of the switch S1.
The invention also discloses a wake-up method based on the internet of things node wake-up receiving device, which comprises the following steps as shown in fig. 7:
A. the awakening receiving device receives an awakening packet transmitted by an external transmitter through an antenna; the wake-up packet comprises a start frame and node ID data;
B. awakening the receiving device to enter a monitoring mode, and intermittently electrifying the awakening circuit to work in a period of T and circularly monitoring whether the start frame of the awakening packet exists or not; wherein T < T, T representing the start frame duration; for example, T is 900. mu.s and T is 1 ms.
In the monitoring mode, the wake-up receiving device is responsible for monitoring whether the transmitter wake-up packet exists or not, and the wake-up receiving device is realized by monitoring a starting frame of the wake-up packet. In this mode, the clock counting module works, and the clock counting module and the logic circuit work together to enable the switch EN to be closed and opened intermittently in the period of T, the switch S1 is closed, and the switch S2 is opened. The switch EN is periodically closed and opened, so that the matching network, the envelope detector, the baseband amplifier and the comparator controlled by the switch EN are periodically and intermittently electrified to work, and the switch S1 is closed and the switch S2 is opened, so that the low-noise amplifier is short-circuited, and the energy consumption module is avoided, so that the power consumption is reduced.
The timing sequence for waking up the receiving device is shown in fig. 6, in the listening mode, T represents one cycle for waking up the receiving device, including the receiving device enabling time Ton and the receiving device sleeping time Toff; the switch EN is turned on during the receiver enable time Ton, and the switch EN is turned off during the receiver sleep time Toff. During one period T, switch S1 is closed, and during Ton time only, switch EN is closed, and the rest of the time switch EN is closed. It can be seen that when the wake-up receiving means is in the listening mode, it is operated at a low duty cycle, and at this time the switch S2 is turned off, i.e. the most power consuming low noise amplifier in the wake-up receiving means is not operated, and therefore the power consumption of the receiver is greatly reduced. In the listening mode, the switch S1 is always in a closed state and the switch S2 is always in an open state.
In the listening mode, the requirement on the intermittent period of the wake-up receiving device is not high because the listening mode is used for listening for the presence or absence of the start frame of the wake-up packet. For example, if the duration of the wakeup packet start frame is 1ms, the period T for waking up the receiving apparatus is smaller than this time, for example, T takes 900 us. The invention does not need to switch the receiver on and off at high speed, and only needs to monitor the signal within the duration of the starting frame, thereby reducing the power consumption to the maximum extent.
C. After detecting a start frame, the wake-up receiving device is switched to a data receiving mode, in the mode, an EN enabling end control switch EN is closed, an S2 enabling end control switch S2 is closed, an S1 enabling end control switch S1 is opened, a matching network, a low noise amplifier, an envelope detector, a baseband amplifier and a comparator in a wake-up circuit are all electrified to work, in the receiving mode, a clock counting circuit stops working, and the periodic intermittent electrification work of the wake-up circuit stops;
and when the wake-up receiving device monitors a wake-up packet start frame, entering a data receiving mode. In the mode, the receiver is responsible for receiving the data of the wake-up packet, the reception is completed, and the data is output after being compared by the comparator.
In this mode, the clock counting module stops working, and the rest modules are in working states. Since the start frame of the wake-up packet is detected, the logic circuit now opens the control switch S1, closes S2, and in this mode the EN is not periodically turned off, but is always closed, as shown in the timing diagram of fig. 6, and the receiver is always on in the receive mode.
The sensitivity expression formula of the awakening receiving device is as follows:
Pin(min)(dBm)＝-174(dBm/Hz)+NF(dB)+10lgB+SNRout(min)(dB)
it can be seen from the sensitivity expression formula of the awakening receiving device that the influence factors of the sensitivity mainly include the noise coefficient, the bandwidth and the output signal-to-noise ratio. The awakening receiving device is responsible for monitoring the starting frame of the awakening packet in the monitoring mode, reduces power consumption and does not sacrifice sensitivity. It should be noted that, compared with the node ID data contained in the wake-up packet, the transmission rate of the start frame of the wake-up packet is very small, which means that the bandwidth requirement on the transmission channel is lower in the start frame portion, the bandwidth is lower, and at the same time, the sensitivity is better. Therefore, although the receiver does not turn on the lna to gain in the monitoring mode, it does not degrade the sensitivity of the receiver, but rather greatly reduces the overall power consumption of the receiver.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1. The utility model provides a receiving arrangement is awaken up to thing networking node which characterized in that: the wake-up circuit comprises an enable control circuit and a wake-up circuit, wherein the output end of the enable control circuit is connected with the controlled end of the wake-up circuit, and the input end of the wake-up circuit receives a wake-up packet transmitted by an external transmitter through an antenna;
the enabling control circuit comprises a clock counting circuit and a logic circuit, wherein the clock counting circuit is connected with the input end of the logic circuit, and the output end of the logic circuit is provided with a comparator connecting end, an EN enabling end, an S1 enabling end and an S2 enabling end;
the wake-up circuit comprises a matching network, a low noise amplifier, an envelope detector, a baseband amplifier and a comparator which are sequentially connected in series, power supply loops of the matching network, the envelope detector, the baseband amplifier and the comparator are all connected in series with a switch EN, a switch S2 is connected in series in the power supply loop of the low noise amplifier, and two ends of the low noise amplifier are connected in parallel with a switch S1;
the comparator connecting end is connected with the comparator, the EN enabling end is used for controlling the on-off of the switch EN, the S2 enabling end is used for controlling the on-off of the switch S2, and the S1 enabling end is used for controlling the on-off of the switch S1.
2. An awakening method for awakening a receiving device based on the node of the internet of things of claim 1, characterized in that: the method comprises the following steps:
A. the awakening receiving device receives an awakening packet transmitted by an external transmitter through an antenna; the wake-up packet comprises a start frame and node ID data;
B. awakening the receiving device to enter a monitoring mode, and intermittently electrifying the awakening circuit to work in a period of T and circularly monitoring whether the start frame of the awakening packet exists or not; wherein T < T, T representing the start frame duration;
in a monitoring mode, an EN enabling end control switch EN is intermittently turned on and off by taking T as a period, an S2 enabling end control switch S2 is turned off, and an S1 enabling end control switch S1 is turned on, at the moment, a low-noise amplifier is short-circuited, a matching network, an envelope detector, a baseband amplifier and a comparator of a wake-up circuit are periodically electrified, and a receiving device is awakened to detect a starting frame;
C. after detecting a start frame, the wake-up receiving device is switched to a data receiving mode, in the mode, an EN enabling end control switch EN is closed, an S2 enabling end control switch S2 is closed, an S1 enabling end control switch S1 is opened, all a matching network, a low noise amplifier, an envelope detector, a baseband amplifier and a comparator in a wake-up circuit are electrified to work, in the receiving mode, a clock counting circuit stops working, and the wake-up circuit stops working in a periodic intermittent electrifying mode.
3. The method for waking up a receiving device by a node of the internet of things according to claim 2, wherein: the period T comprises a receiving device enabling time Ton and a receiving device sleeping time Toff; the switch EN is turned on during the receiver enable time Ton, and the switch EN is turned off during the receiver sleep time Toff.
4. The method for waking up a receiving device by a node of the internet of things according to claim 3, wherein: t is 900 mus, and T is 1 ms.
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| CN112769440B (en) * | 2020-11-04 | 2022-03-18 | 山东科技大学 | Low-power-consumption digital intelligent USBL receiver |
| WO2023184521A1 (en) * | 2022-04-02 | 2023-10-05 | 中国科学技术大学 | Wake-up receiver |
| CN114614845B (en) * | 2022-04-02 | 2023-03-14 | 中国科学技术大学 | Wake-up receiver |
| CN116996080B (en) * | 2023-09-26 | 2023-12-05 | 中国科学技术大学 | Radio frequency circuit of wake-up receiver |
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| CN101404511A (en) * | 2008-06-04 | 2009-04-08 | 浙江大学 | Energy-saving control device for wireless sensor network node circuit |
| CN205081682U (en) * | 2014-03-31 | 2016-03-09 | 意法半导体股份有限公司 | Switching power converter and circuit that is used for switching power converter |
| CN208386945U (en) * | 2018-05-23 | 2019-01-15 | 华南理工大学 | A kind of wake-up circuit for acquiring RF energy for wireless sensor node |
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| KR100703215B1 (en) * | 2006-02-20 | 2007-04-09 | 삼성전기주식회사 | Device for low power wireless communication and method of the same |
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|---|---|---|---|---|
| CN101404511A (en) * | 2008-06-04 | 2009-04-08 | 浙江大学 | Energy-saving control device for wireless sensor network node circuit |
| CN205081682U (en) * | 2014-03-31 | 2016-03-09 | 意法半导体股份有限公司 | Switching power converter and circuit that is used for switching power converter |
| CN208386945U (en) * | 2018-05-23 | 2019-01-15 | 华南理工大学 | A kind of wake-up circuit for acquiring RF energy for wireless sensor node |
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