CN115243352A - Anti-false detection low-power-consumption wireless awakening method - Google Patents

Anti-false detection low-power-consumption wireless awakening method Download PDF

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CN115243352A
CN115243352A CN202210811086.0A CN202210811086A CN115243352A CN 115243352 A CN115243352 A CN 115243352A CN 202210811086 A CN202210811086 A CN 202210811086A CN 115243352 A CN115243352 A CN 115243352A
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sequence
wake
receiving unit
wireless receiving
wireless
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龙力
王正
梁霄
朱洁静
刘轩
黎光洁
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Chongqing Yuxin Micro Information Technology Co ltd
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Chongqing Yuxin Micro Information Technology Co ltd
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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
    • H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • 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

Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to an anti-false-detection low-power-consumption wireless awakening method, which comprises the following steps of: the system is configured, the configuration unit configures awakening ID information, and the wireless receiving unit generates a local reference elastic awakening sequence; the base station sends an elastic wake-up sequence; the wireless receiving unit receives an elastic wake-up sequence; the digital signal processing module demodulates and calculates the elastic wake-up sequence; the digital signal processing module compares the cross-correlation peak value result with a preset threshold value and judges whether the cross-correlation peak value result is awakened or not; the wireless receiving unit which is not waken keeps a low-power consumption sleep state until the next wakening period; by adopting the awakening method, the awakening accuracy can be improved, and because the ID information is verified in the awakening process, the ID verification is not required to be further performed by the upper processor MCU, so that the system power consumption can be saved.

Description

Anti-false detection low-power-consumption wireless awakening method
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to an anti-false-detection low-power-consumption wireless awakening method.
Background
In the design of the wireless sensor network, most wireless transceiver nodes need a low-power consumption processing mechanism. In order to reduce the overall power consumption of the system, a transceiver needs to reduce useless working time, ideally, when data needs to be received, a node is in a receiving state, when no information is received, the node is in a sleeping state, and therefore a wireless awakening technology is needed; if yes, the receiver is awakened to enter a receiving state, so that the aim of reducing the average power consumption of the receiver is fulfilled.
How to find a call signal is judged by setting an RSSI threshold value in the traditional method, but a simple RSSI index cannot well judge the transmission state of air-interface wireless data and is gradually eliminated, and with the application of various modulation technologies, a general CCA method appears, and the state of a transmitter is detected in a carrier sense mode; and detecting the carrier active state by a CAD method, thereby determining whether a radio signal is in or ready to be transmitted.
However, the CCA method and the wireless wake-up mechanism of the CAD method have the following problems:
(1) the CCA and CAD can determine the message transmission status in the system through the carrier status, and can only distinguish whether there is a message being transmitted, and lack of sensing ability for the destination and the receiving object of the message, which is equivalent to that the wakeup process may wake up all receivers in the system, but only one of the receivers actually needs to receive and process data.
(2) The results of CCA and CAD detection often need to be processed and further judged by the upper processor MCU, and the upper computer needs to exit the sleep state, and in more cases, the upper processor MCU needs to continuously receive a complete message to determine whether to be called by the transmitter, which results in considerable extra energy consumption for the non-target receiver system. The larger the network capacity, the more severe this inefficient consumption.
Therefore, an anti-false detection low-power consumption wireless awakening method is provided.
Disclosure of Invention
The purpose of the invention is: the method aims to provide an anti-false-detection low-power-consumption wireless awakening method which is used for solving the problems existing in the practical application process of the prior art in the background art.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a false detection prevention low-power consumption wireless awakening method comprises a wireless communication system consisting of a base station, a configuration unit and a plurality of wireless receiving units, wherein the wireless receiving units are provided with wireless receiving and transmitting chips, and the wireless receiving and transmitting chips consist of the following modules:
the power supply module is used for providing power supply for the wireless receiving unit;
the radio frequency module is used for receiving wireless signals and can be periodically dormant and started according to a specific period delta T;
the digital signal processing module is used for demodulating and calculating the received signals;
when the wireless receiving unit is not awakened, the wireless receiving unit is in a low-power-consumption sleep state, and only the radio frequency module is periodically dormant and turned on;
the configuration unit configures one or more wake-up IDs for each wireless receiving unit respectively so as to be used for waking up in different application scenes;
the awakening method comprises the following steps:
step 1: the system configuration comprises that a configuration unit configures one or more awakening ID information for each wireless receiving unit and numbers the awakening ID information, and the wireless receiving unit correspondingly generates each local reference elastic awakening sequence according to each awakening ID;
step 2: when waking up a specific wireless receiving unit, the base station integrates all the wake-up ID information configured by the target wireless receiving unit into an elastic wake-up sequence and sends the elastic wake-up sequence;
and step 3: the radio frequency module of the wireless receiving unit is periodically switched on from a dormant state to receive an elastic awakening sequence sent by the base station, and the digital signal processing module is still in a closed state at the moment;
and 4, step 4: the radio frequency module of the wireless receiving unit actively closes after receiving the elastic wake-up sequence with set duration, and the digital signal processing module actively opens to demodulate and calculate the received elastic wake-up sequence;
and 5: the digital signal processing module compares all cross-correlation peak value results after calculation processing in the step 4 with a preset threshold one by one, if at least one cross-correlation peak value result exceeds the preset threshold, the wireless receiving unit judges that the wireless receiving unit is being awakened, and if all the cross-correlation peak value results do not reach the preset threshold, the wireless receiving unit judges that the wireless receiving unit is not awakened and continues to keep a low-power-consumption sleep state;
step 6: and the wireless receiving unit which is not waken keeps the low-power consumption sleep state until the next wakening period, and the processes from the step 3 to the step 5 are repeated.
The elastic wake-up sequence in the step 1 and the step 2 is a constant-envelope zero auto-correlation sequence (CAZAC sequence), and can be selected from a Zadoff-chu sequence (ZC sequence), a Frank sequence, a Golomb polyphase sequence, and a generalized Chirp-Like sequence (GCL sequence).
In the above steps 1 and 2, a plurality of identical CAZAC sequences may be arranged according to the difference in the snr level of the environment in which the wireless communication system is located, and the lower the received snr is, the greater the number M of the arranged sequences and the longer the arranged sequence segment length K is.
In step 3, when the radio frequency module receives the CAZAC sequence transmitted by the base station, the fractional frequency offset compensation is performed according to a certain search criterion (for example, network search with equal frequency intervals).
When the digital signal processing module performs calculation processing on the received CAZAC sequence in step 4, the cross-correlation sequence calculation is performed according to the segment length K of the received CAZAC sequence and the local reference CAZAC sequence of the wakeup ID, and then the cross-correlation sequences with the number M obtained by calculation are combined according to the number M of the received CAZAC sequences to obtain a cross-correlation peak value.
When cross-correlation sequence calculation is performed according to the segment length K of the received CAZAC sequence and the local reference CAZAC sequence, the formula is as follows:
Figure BDA0003739038290000031
wherein, the first and the second end of the pipe are connected with each other,
x = (1, 2,3.. Z), x is the wake-up ID number of the wireless receiving unit;
f m and g m Respectively representing the mth segment sequence of the received CAZAC sequence and the mth end segment sequence of the local reference CAZAC sequence.
When combining the calculated number M of cross-correlation sequences according to the number M of the received CAZAC sequences, combining the cross-correlation sequences according to the following formula:
Figure BDA0003739038290000032
and estimating the decimal frequency offset of the current received signal according to the maximum likelihood criterion and recording the current cross-correlation peak value.
The awakening method can improve the awakening accuracy, awaken a certain receiver or a certain group of receivers appointed in the system, and the wireless receiving unit does not need the upper processor MCU to further carry out ID verification because the ID information is verified in the awakening process, and the upper processor MCU continues to keep a sleep state in the awakening process, so that the power consumption of the system can be saved.
Drawings
The invention is further illustrated by the non-limiting examples given in the figures.
FIG. 1 is a schematic flow diagram of an anti-false detection low-power consumption wireless wake-up method according to the present invention;
FIG. 2 is a diagram of a CAZAC sequence of the anti-false detection low power consumption wireless wake-up method of the present invention;
fig. 3 is a structural diagram of a ZC sequence according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of power consumption of the wake-up method according to the present invention and the conventional wake-up method.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
A false detection prevention low-power consumption wireless awakening method comprises a wireless communication system consisting of a base station, a configuration unit and a plurality of wireless receiving units, wherein the wireless receiving units are provided with wireless receiving and transmitting chips, and the wireless receiving and transmitting chips consist of the following modules:
the power supply module is used for providing power supply for the wireless receiving unit;
the radio frequency module is used for receiving wireless signals and can be periodically dormant and started according to a specific period delta T;
the digital signal processing module is used for demodulating and calculating the received signals;
when the wireless receiving unit is not awakened, the wireless receiving unit is in a low-power-consumption sleep state, and only the radio frequency module is periodically dormant and turned on;
the configuration unit respectively configures one or more awakening IDs for each wireless receiving unit so as to be used for awakening in different application scenes;
the awakening method comprises the following steps:
step 1: the system configuration comprises that a configuration unit configures one or more awakening ID information for each wireless receiving unit and numbers the awakening ID information, and the wireless receiving unit correspondingly generates each local reference elastic awakening sequence according to each awakening ID;
in a wireless communication system, each communication terminal can be assigned with one or a plurality of IDs (identity) to be used as a communication identifier, so that the receiving terminal can be awakened by a transmitter under different application scenes, and the awakening efficiency is increased;
the elastic wake-up sequence is a constant-envelope zero autocorrelation sequence (CAZAC sequence), the CAZAC sequence has constant envelope, ideal periodic autocorrelation characteristic, good cross-correlation characteristic, low peak-to-average ratio characteristic and the characteristic of the CAZAC sequence after Fourier transform, and can be selected and adopted from a Zadoff-chu sequence (ZC sequence), a Frank sequence, a Golomb polyphase sequence and a generalized Chirp-Like sequence (GCL sequence);
step 2: when waking up a specific wireless receiving unit, the base station integrates all wake-up ID information configured by the target wireless receiving unit into an elastic wake-up sequence and sends the elastic wake-up sequence;
the elastic wake-up sequence is a constant envelope zero auto-correlation sequence (CAZAC sequence), the CAZAC sequence has constant envelope, ideal periodic auto-correlation characteristic, good cross-correlation characteristic, low peak-to-average ratio characteristic and the characteristic of the CAZAC sequence after Fourier transform, and can be selected and adopted from a Zadoff-chu sequence (ZC sequence), a Frank sequence, a Golomb polyphase sequence and a generalized Chirp-Like sequence (GCL sequence);
meanwhile, according to different signal-to-noise ratios of environments where the wireless communication system is located, a plurality of same CAZAC sequences can be configured, and the lower the received signal-to-noise ratio is, the more the number M of the configured sequences is, and the longer the length K of the configured sequence segments is;
and step 3: the radio frequency module of the wireless receiving unit is periodically switched on from a dormant state to receive an elastic wake-up sequence sent by a base station, and when the radio frequency module receives a CAZAC sequence sent by the base station, because the CAZAC sequence is insensitive to integer frequency offset and reflects that only the movement of a peak value position is calculated on a cross-correlation sequence, fractional frequency multiplication offset compensation is carried out according to a certain search criterion (such as network search with equal frequency intervals), and at the moment, the digital signal processing module is still in a closed state;
and 4, step 4: the radio frequency module of the wireless receiving unit actively closes after receiving the elastic wake-up sequence with set duration, the digital signal processing module actively opens, demodulates and calculates the received elastic wake-up sequence, and the cross-correlation sequence calculation is firstly carried out according to the segment length K of the received CAZAC sequence and the local reference CAZAC sequence of the wake-up ID during the calculation, and the formula is as follows:
Figure BDA0003739038290000041
wherein the content of the first and second substances,
x = (1, 2,3.. Z), x being the wireless receiving unit's wake-up ID number;
f m and g m An m-th subsegment sequence representing the m-th subsegment sequence of the received CAZAC sequence and the m-th end subsegment sequence of the local reference CAZAC sequence;
and when the cross-correlation sequences with the number M obtained by calculation are combined according to the number M of the received CAZAC sequences, the cross-correlation sequences are combined according to the following formula:
Figure BDA0003739038290000051
and estimating the decimal frequency offset of the current received signal according to the maximum likelihood criterion and recording the current cross-correlation peak value.
And 5: the digital signal processing module compares all cross-correlation peak value results after calculation processing in the step 4 with a preset threshold value one by one, if at least one cross-correlation peak value result exceeds the preset threshold value, the wireless receiving unit judges that the peak value results are wakened, and if all the cross-correlation peak value results do not reach the preset threshold value, the wireless receiving unit judges that the peak value results are not wakened, and the low-power-consumption sleep state is continuously kept;
step 6: and keeping the wireless receiving unit which is not awakened in the low-power consumption sleep state until the next awakening period, and repeating the processes from the step 3 to the step 5.
The examples are as follows:
in this embodiment, a wake-up sequence and a wake-up flow description in an Internet of Things communicAtion basic frame structure based on a Wide-range Internet of Things (worldwide interoperability protocol) protocol are described, and the wake-up sequence and the wake-up flow are application embodiments of an anti-false detection low-power consumption wireless wake-up method.
First, the meaning of each term appearing in the present embodiment is explained:
ZCSYMBol: a ZC sequence symbol, which represents a ZC transmission unit in the WIoTa system synchronization header in this embodiment, is an odd-numbered arithmetic sequence;
IoTE: internet of Things Equipment, which in this embodiment represents a terminal device of a WIoTa system;
AP: access Point, in this embodiment, represents a base station of the WIoTa system.
The wake-up steps in this embodiment are as follows:
step 1: system configuration, namely assigning wake-up IDs to the IOTEs respectively, wherein each IoTE has at least one wake-up ID and can assign a plurality of wake-up IDs, and generating each local reference ZC sequence correspondingly according to each wake-up ID;
step 2: when the AP needs to actively awaken a specific IoTE, a transmitter of the AP continuously transmits a ZC sequence carrying awakening ID information on an air interface, the number M =6 of the ZC sequences is set, the length K =1024, a receiver of the IoTE is opened from a closed state for receiving data once according to a period of 1 second;
and step 3: the IoTE closes the receiver, the digital signal processing functional module carries out cross-correlation sequence calculation on the received signals with the length of M =6 ZC symbols according to the length of a subsection K =1021 and a local reference ZC Symbol of one awakening ID, merges the cross-correlation sequences with the number of M =6, estimates the decimal frequency deviation of the current received signals according to the maximum likelihood criterion and records the current cross-correlation peak value;
and 4, step 4: the digital signal processing module judges whether the mobile terminal is awakened by a transmitter of the AP or not according to a preset threshold, if the cross-correlation peak value does not exceed the threshold, another local reference ZC sequence of the awakening ID of the IoTE is started, and the calculation in the step 3 is repeated until the calculation of all the reference sequences and the received signal is finished or the cross-correlation peak value exceeds the threshold;
and 5: when the cross-correlation peak value exceeds the threshold value, the IoTE upper layer application is awakened to perform corresponding service processing, and after the service processing is completed, the low power consumption mode is entered again according to the program setting; and when no cross-correlation peak value exceeds the threshold value in the whole wake-up detection process, the upper layer application continues to keep the low power consumption mode, and the receiver and the data processing module are closed until the next wake-up detection period.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (7)

1. A false detection prevention low-power consumption wireless awakening method is characterized in that: the wireless communication system comprises a base station, a configuration unit and a plurality of wireless receiving units, wherein the wireless receiving units are provided with wireless transceiving chips, and the wireless transceiving chips comprise the following modules:
the power supply module is used for providing power supply for the wireless receiving unit;
the radio frequency module is used for receiving wireless signals and can be periodically dormant and started according to a specific period delta T;
the digital signal processing module is used for demodulating and calculating the received signals;
when the wireless receiving unit is not awakened, the wireless receiving unit is in a low-power-consumption sleep state, and only the radio frequency module is periodically dormant and turned on;
the configuration unit configures one or more awakening IDs for each wireless receiving unit respectively so as to be used for awakening in different application scenes;
the awakening method comprises the following steps:
step 1: the system configuration comprises that a configuration unit configures one or more awakening ID information for each wireless receiving unit and numbers the awakening ID information, and the wireless receiving unit correspondingly generates each local reference elastic awakening sequence according to each awakening ID;
step 2: when waking up a specific wireless receiving unit, the base station integrates all the wake-up ID information configured by the target wireless receiving unit into an elastic wake-up sequence and sends the elastic wake-up sequence;
and 3, step 3: the radio frequency module of the wireless receiving unit is periodically switched on from a dormant state to receive an elastic awakening sequence sent by the base station, and the digital signal processing module is still in a closed state at the moment;
and 4, step 4: the radio frequency module of the wireless receiving unit actively closes after receiving the elastic wake-up sequence with set duration, and the digital signal processing module actively opens to demodulate and calculate the received elastic wake-up sequence;
and 5: the digital signal processing module compares all cross-correlation peak value results after calculation processing in the step 4 with a preset threshold one by one, if at least one cross-correlation peak value result exceeds the preset threshold, the wireless receiving unit judges that the wireless receiving unit is being awakened, and if all the cross-correlation peak value results do not reach the preset threshold, the wireless receiving unit judges that the wireless receiving unit is not awakened and continues to keep a low-power-consumption sleep state;
step 6: and keeping the wireless receiving unit which is not awakened in the low-power consumption sleep state until the next awakening period, and repeating the processes from the step 3 to the step 5.
2. The anti-false detection low-power consumption wireless wake-up method according to claim 1, characterized in that: the elastic wake-up sequence in the step 1 and the step 2 is a constant-envelope zero auto-correlation sequence (CAZAC sequence), and can be selected from a Zadoff-chu sequence (ZC sequence), a Frank sequence, a Golomb polyphase sequence, and a generalized Chirp-Like sequence (GCL sequence).
3. The anti-false detection low-power consumption wireless wake-up method according to claim 2, characterized in that: in the above steps 1 and 2, a plurality of identical CAZAC sequences may be arranged according to the difference in the snr level of the environment in which the wireless communication system is located, and the lower the received snr is, the greater the number M of the arranged sequences and the longer the arranged sequence segment length K is.
4. The anti-false detection low-power consumption wireless wake-up method according to claim 3, characterized in that: in step 3, when the radio frequency module receives the CAZAC sequence transmitted by the base station, the fractional frequency offset compensation is performed according to a certain search criterion (for example, network search with equal frequency intervals).
5. The anti-false detection low-power consumption wireless wake-up method according to claim 4, characterized in that: when the digital signal processing module performs calculation processing on the received CAZAC sequence in step 4, the cross-correlation sequence calculation is performed according to the segment length K of the received CAZAC sequence and the local reference CAZAC sequence of the wake-up ID, and then the cross-correlation sequences with the number M obtained by calculation are combined according to the number M of the received CAZAC sequences to obtain a cross-correlation peak value.
6. The anti-false detection low-power consumption wireless wake-up method according to claim 5, characterized in that: when cross-correlation sequence calculation is performed according to the segment length K of the received CAZAC sequence and the local reference CAZAC sequence, the formula is as follows:
Figure FDA0003739038280000021
wherein, the first and the second end of the pipe are connected with each other,
x = (1, 2,3.. Z), x is the wake-up ID number of the wireless receiving unit;
f m and g m Respectively representing the mth segment sequence of the received CAZAC sequence and the mth end segment sequence of the local reference CAZAC sequence.
7. The anti-false detection low-power consumption wireless wake-up method according to claim 6, characterized in that: when combining the calculated number M of cross-correlation sequences according to the number M of the received CAZAC sequences, combining the cross-correlation sequences according to the following formula:
Figure FDA0003739038280000022
and estimating the decimal frequency offset of the current received signal according to the maximum likelihood criterion and recording the current cross-correlation peak value.
CN202210811086.0A 2022-07-11 2022-07-11 Anti-false detection low-power-consumption wireless awakening method Pending CN115243352A (en)

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