CN112235876A - Internet of things communication anti-collision control method based on power grid power frequency - Google Patents

Internet of things communication anti-collision control method based on power grid power frequency Download PDF

Info

Publication number
CN112235876A
CN112235876A CN202010973487.7A CN202010973487A CN112235876A CN 112235876 A CN112235876 A CN 112235876A CN 202010973487 A CN202010973487 A CN 202010973487A CN 112235876 A CN112235876 A CN 112235876A
Authority
CN
China
Prior art keywords
power frequency
power grid
power
internet
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010973487.7A
Other languages
Chinese (zh)
Other versions
CN112235876B (en
Inventor
林枝堂
潘叶江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vatti Co Ltd
Original Assignee
Vatti Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vatti Co Ltd filed Critical Vatti Co Ltd
Priority to CN202010973487.7A priority Critical patent/CN112235876B/en
Publication of CN112235876A publication Critical patent/CN112235876A/en
Application granted granted Critical
Publication of CN112235876B publication Critical patent/CN112235876B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/30003—Arrangements for executing specific machine instructions
    • G06F9/30007—Arrangements for executing specific machine instructions to perform operations on data operands
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/30098—Register arrangements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Energy or water supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Economics (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Signal Processing (AREA)
  • Human Resources & Organizations (AREA)
  • Marketing (AREA)
  • Primary Health Care (AREA)
  • Strategic Management (AREA)
  • Tourism & Hospitality (AREA)
  • General Business, Economics & Management (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses an Internet of things communication anti-collision control method based on power grid power frequency, which comprises the following steps: s1, performing system power-on initialization; s2, determining the power frequency of the power grid where the system is located; s3, dividing the cycle time corresponding to the power frequency of the power grid where the system is located into a preset number of equal time slices and marking serial numbers; s4, the system monitors the data receiving condition of its receiving end according to the time slice serial number, when the current serial number time slice has no data receiving, then an internet of things device in the control system can initiate communication data. According to the power frequency-based Internet of things communication anti-collision control method of the power frequency of the power grid, the cycle time corresponding to the power frequency of the power grid where the system is located is divided into a preset number of equal time slices, serial numbers are marked, the data receiving condition of a receiving end of the system is monitored according to the serial numbers of the time slices, when no data is received by the current serial number, the Internet of things equipment is controlled to initiate communication data, a plurality of sending points are sent at intervals, communication collision is avoided, and accurate control of the control system is guaranteed.

Description

Internet of things communication anti-collision control method based on power grid power frequency
Technical Field
The invention belongs to the technical field of power supply of a power grid, and particularly relates to an Internet of things communication anti-collision control method based on power frequency of the power grid.
Background
At present, in product application, more and more internet of things devices enter the daily life of people, and data communication between the devices is more and more compact.
Mutual interference occurs between a plurality of wireless devices using the same frequency band; if a plurality of transmitting devices are arranged on the site, collision interference can occur at a receiving end, and data receiving is wrong; in real-time control, if a data receiving error occurs, the system can be in an out-of-control state, user experience is affected, and even great potential safety hazards are brought, so that it is necessary to solve the conflict problem of the wireless communication technology in practical application.
Disclosure of Invention
In order to solve the problems, the invention provides an Internet of things communication anti-collision control method based on power frequency of a power grid.
The technical scheme adopted by the invention is as follows:
an Internet of things communication anti-collision control method based on power grid power frequency comprises the following steps:
s1, performing system power-on initialization;
s2, determining the power frequency of the power grid where the system is located;
s3, dividing the cycle time corresponding to the power frequency of the power grid where the system is located into a preset number of equal time slices and marking serial numbers;
and S4, the system monitors the data receiving condition of the receiving end according to the time slice serial number, and when the current serial number time slice has no data receiving, the system controls an internet of things device in the system to start communication data.
Preferably, the S2 is specifically:
s21, reading level signals input by the power frequency of the current power grid according to the same time interval;
s22, judging whether the level signal has zero-crossing change or not, recording the times of the zero-crossing change, and counting the total time length of the zero-crossing change for 3 continuous times;
and S23, determining the power frequency of the current power grid according to the total duration.
Preferably, the preset number of the time slices in S3 is at least the sum of the number of the internet-of-things devices in the system.
Preferably, in S22, the step of determining whether the level signal has a zero-crossing change specifically includes the following steps:
s221, reading a level signal input by the power frequency of the current power grid every N microseconds, and recording the level signal by using a current level value;
s222, calculating results of the front level value and the rear level value through bit XOR operation, wherein if the bit XOR operation result is larger than zero, the level signal generates zero-crossing change; if the result of the exclusive-or operation is not greater than zero, the process returns to step S221.
Preferably, the result of calculating the two previous and next level values through a bit exclusive or operation is, specifically, the result of calculating the current level value and the previous level value through a bit exclusive or operation.
Preferably, the S23 is specifically:
and judging whether the total time length falls within the cycle time range of the preset rated power frequency, if so, determining that the current power grid power frequency is the corresponding rated power frequency, and if not, judging that the current power grid is abnormal.
Preferably, the preset rated power frequency is 60HZ or 50 HZ.
Preferably, when the power grid power frequency is 60HZ power supply, the cycle range of the rated power frequency is 16.6ms +/-10%; when the power grid power frequency is 50HZ power supply, the cycle range of the rated power frequency is 20ms +/-10%.
Compared with the prior art, the system is electrified and initialized, the power frequency of the power grid where the system is located is determined, then the cycle time corresponding to the power frequency of the power grid where the system is located is divided into a preset number of equal time slices and the serial numbers are marked, the system monitors the data receiving condition of the receiving end of the system according to the time slice serial numbers, and when no data is received in the current serial number time slice, the system is controlled to enable one Internet of things device in the system to initiate communication data; namely, a plurality of time slices are divided and serial numbers are marked by utilizing the rated power frequency of a power grid where the system is located, and when no data is received in the current time slice, one Internet of things device in the control system can start communication data to enable a plurality of sending points to send at intervals, so that communication conflict is avoided, and accurate control of the system is ensured.
Drawings
Fig. 1 is a flowchart of an internet of things communication anti-collision control method based on power frequency of a power grid according to an embodiment of the present invention;
fig. 2 is a flowchart of embodiment S2 in the method for controlling anti-collision of internet of things communication based on power frequency of a power grid according to the present invention;
fig. 3 is a flowchart of embodiment S22 in the method for controlling anti-collision of internet of things communication based on power frequency of a power grid according to the present invention;
fig. 4 is a specific flowchart of an internet of things communication anti-collision control method based on power frequency of a power grid according to an embodiment of the present invention;
fig. 5 is a specific flowchart of a computing process included in the method for controlling the internet of things communication anti-collision based on the power frequency of the power grid according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides an Internet of things communication anti-collision control method based on power frequency of a power grid, which comprises the following steps as shown in figure 1:
s1, performing system power-on initialization;
s2, determining the power frequency of the power grid where the system is located;
s3, dividing the cycle time corresponding to the power frequency of the power grid where the system is located into a preset number of equal time slices and marking serial numbers;
and S4, the system monitors the data receiving condition of the receiving end according to the time slice serial number, and when the current serial number time slice has no data receiving, the system controls an internet of things device in the system to start communication data.
In this way, by carrying out power-on initialization on the system, determining the power frequency of the power grid where the system is located, dividing the cycle time corresponding to the power frequency of the power grid where the system is located into a preset number of equal time slices and marking serial numbers, monitoring the data receiving condition of a receiving end of the system according to the sequence number of the time slices, and controlling an internet of things device in the system to initiate communication data when no data is received in the current serial number time slice; the method is characterized in that a plurality of time slices are divided and serial numbers are marked by utilizing the rated power frequency of a power grid where the system is located, communication data can be sent by one Internet of things device in the control system when no data is received in the current time slice, a plurality of sending points can send the data at intervals, communication conflicts are effectively avoided, and accurate control of the system is ensured.
In a specific implementation, the setting of the original register is performed after the system in S1 is powered on and initialized, as shown in fig. 4 and 5, specifically:
s11, electrifying and initializing, setting the data valid flag as an invalid value, and setting the storage time slice sequence number flag as an invalid value;
the method specifically comprises the following steps: after power-on initialization, setting a data valid flag to be an invalid value to ensure the reliability of a level signal acquired in a later period, namely, fly _ Zero is False (the invalid value);
setting the stored time slice sequence number flag to an invalid value, namely, fly _ Timer ═ False (invalid value);
s12, setting the current level value as a null value for recording the level of the level signal;
setting the previous level value as a null value for recording the previous state value of the level signal changing;
setting the level period time to be a null value for recording the period time when the level signal changes;
and setting the single level period time as a null value to provide a time basis for judging the current power frequency of the power grid.
The method specifically comprises the following steps:
setting the current level value to a Null value for recording the high and low of the level signal, i.e., 0/1 state (0 represents low level and 1 represents high level), i.e., Now _ Pulse ═ Null;
setting the previous level value as a Null value for recording a previous state value of the level signal that has changed, i.e., Pre _ Pulse ═ Null;
setting the level period time to a Null value for recording a period time in which the level signal changes (i.e., 0- >1-0 or 1- >0- >1), i.e., timer _ zero ═ Null;
and setting the single level period time as a null value to provide a time basis for judging the current power grid power frequency, namely, the time _ Pulse is equal to the time _ zero.
Therefore, through power-on initialization, a data valid flag is set, and the value of the time slice sequence number and the configuration register are stored, so that the reliability of the level signal acquired in the later period can be ensured.
In specific implementation, the step S2 is to determine the power frequency of the power grid where the system is located, as shown in fig. 2, specifically:
s21, reading level signals input by the power frequency of the current power grid according to the same time interval;
s22, judging whether the level signal has zero-crossing change or not, recording the times of the zero-crossing change, and counting the total time length of the zero-crossing change for 3 continuous times;
and S23, determining the power frequency of the current power grid according to the total duration.
Therefore, the power frequency of the power grid where the system is located is obtained by reading the level signal input by the power frequency of the current power grid according to the same time interval, counting the total time length of continuous 3 times of zero-crossing changes according to whether the level signal has the zero-crossing changes and recording the times of the zero-crossing changes, and determining the power frequency of the current power grid according to the total time length.
In a specific implementation, as shown in fig. 3, the step of determining whether the level signal has a zero-crossing change in S22 specifically includes the following steps:
s221, reading a level signal input by the power frequency of the current power grid every N microseconds, and recording the level signal by using a current level value;
s222, calculating results of the front level value and the rear level value through bit XOR operation, wherein if the bit XOR operation result is larger than zero, the level signal generates zero-crossing change; if the result of the exclusive or operation is not greater than zero, returning to step S221;
the result of the previous level value and the result of the next level value are calculated through the bit exclusive-or operation, and specifically, the result of the current level value and the result of the previous level value are calculated through the bit exclusive-or operation.
In specific implementation, the S23 determines the power frequency of the current power grid according to the total duration, specifically:
and judging whether the total time length falls within the cycle time range of the preset rated power frequency, if so, determining that the current power grid power frequency is the corresponding rated power frequency, and if not, judging that the current power grid is abnormal.
And the preset rated power frequency is 60HZ or 50 HZ.
Moreover, when the power grid power frequency is 60HZ power supply, the cycle range of the rated power frequency is 16.6ms +/-10%; when the power grid power frequency is 50HZ power supply, the cycle range of the rated power frequency is 20ms +/-10%.
As shown in fig. 3, the step of refining the power frequency of the power grid where the system is determined by S2 includes the following steps:
s21, reading level signals input by the power frequency of the current power grid according to the same time interval;
s221, reading a level signal input by the power frequency of the current power grid every N microseconds, and recording the level signal by using a current level value;
the method specifically comprises the following steps: every N microseconds, reading a level signal input by the power frequency of the current power grid, and recording by using a current level value, namely recording by using Now _ Pulse;
s222, calculating results of the front level value and the rear level value through bit XOR operation, wherein if the bit XOR operation result is larger than zero, the level signal generates zero-crossing change; if the result of the exclusive or operation is not greater than zero, returning to step S221;
the method specifically comprises the following steps:
a result of calculating two level values before and after by a bit exclusive-or operation, that is, a result of calculating a present level value and a previous level value by a bit exclusive-or operation, that is, (present level value Now _ Pulse) "bit exclusive-or" (previous level value Pre _ Pulse);
if the bit XOR operation result is larger than zero, the level is changed by zero crossing;
if the result of the exclusive or operation is not greater than zero, returning to step S221;
s223, recording the times of zero-crossing change, and counting the total time length of the continuous 3 times of zero-crossing change;
the method specifically comprises the following steps:
when the level changes from zero crossing, the level period time, namely timer _ zero, starts to time, and the previous level state, namely Pre _ Pulse is not _ Pulse, is recorded by the previous level value;
then, it is determined whether the data valid flag is a valid value, i.e., fly _ Zero? (ii) a
If so, namely the data valid flag is a valid value, obtaining the single level cycle time of the current power grid power frequency, namely recording the single level cycle time of the current power grid power frequency, wherein 0- >1-0 or 1- >0- >1, and the time _ Pulse is time _ zero;
otherwise, that is, the data valid flag is not a valid value, the data valid flag is set to a valid value, and S21 is entered.
S23, determining the power frequency of the current power grid according to the total duration, namely: judging whether the total duration falls within the cycle time range of preset rated power frequency;
if so, determining the current power grid power frequency as the corresponding rated power frequency;
if not, judging that the current power grid is abnormal.
The method specifically comprises the following steps:
judging whether the total time length falls within the cycle time range of the preset rated power frequency, namely judging whether the numerical value of the total time length (timer _ Pulse) falls within the cycle time range of the preset rated power frequency, namely the cycle time range of 50Hz (20ms +/-10%) and the cycle time range of 60Hz (16.6ms +/-10%);
if so, determining that the current power grid power frequency is the corresponding rated power frequency, and obtaining the level cycle time of the current power grid power frequency, namely a complete cycle time T of the current power grid power frequency;
specifically, if the time _ Pulse is 16.6ms ± 10%, the current power grid power frequency belongs to the 60Hz cycle time range, and if the time _ Pulse is 20ms ± 10%, the current power grid power frequency belongs to the 60Hz cycle time range.
Otherwise, if the time does not belong to the cycle time range of 50Hz and 60Hz, the abnormal signal is sent out, and a system fault report prompt is sent out.
In specific implementation, in S23, when the power grid power frequency is 60HZ, the cycle range of the rated power frequency is 16.6ms ± 10%; when the power grid power frequency is 50HZ power supply, the cycle range of the rated power frequency is 20ms +/-10%.
In specific implementation, as shown in fig. 3 to 5, S3 divides the cycle time corresponding to the power frequency of the power grid where the system is located into a predetermined number of equal time slices and marks serial numbers, specifically:
firstly, judging whether the sequence number mark of the current storage time slice is a valid value;
if yes, that is, the current stored slice sequence number flag is valid, that is, fly _ Timer ═ Ture, then go to S4;
otherwise, that is, if the current stored time slice sequence number flag is not a valid value, dividing the cycle time corresponding to the power frequency of the power grid where the system is located into a predetermined number of equal time slices and marking the sequence number.
In a specific implementation, the preset number of the time slices in S3 is at least the sum of the number of the internet-of-things devices in the system.
Specifically, if there are N pieces of internet-of-things equipment in the system, N or more time slices may be divided according to the frequency cycle T of the current power grid. And when the sine alternating current changes along with the time according to the sine function rule, the time slice sequence number is also circulated in a progressive way.
In a specific implementation, as shown in fig. 3 to fig. 5, the S4 system monitors the data receiving condition of its receiving end according to the time slice serial number, and when the current serial number time slice has no data receiving, an internet of things device in the control system may initiate communication data, specifically:
judging whether a receiving end of the monitoring device receives data or not;
if not, storing the current time slice sequence number TNOWAnd set it as the valid value, i.e. fly _ Timer ═ Ture, at this time, an internet of things device in the controllable system can initiate communication data;
otherwise, the process proceeds to S2.
Wherein S is4, starting from the occurrence of the level zero crossing change, waiting for the arrival of the sequence number of the stored time slice, and initiating communication data, as shown in fig. 2, starting from the occurrence of the level zero crossing change, and waiting until TNOWArrives, initiates communication data.
Thus, when the monitoring receiving end does not receive the data, the system is in an incommunication state at the moment, and the current time slice serial number T is recorded and storedNOWThe stored time slice sequence number is the time slice sequence number capable of initiating communication, so that a plurality of sending points send at intervals to avoid communication conflicts.
In the embodiment, a system is electrified and initialized, the power frequency of a power grid where the system is located is determined, then, the cycle time corresponding to the power frequency of the power grid where the system is located is divided into a preset number of equal time slices and serial numbers are marked, the system monitors the data receiving condition of a receiving end of the system according to the sequence number of the time slices, and when no data is received in the current serial number time slice, one internet of things device in the system is controlled to start communication data; the method comprises the steps that a plurality of time slices are divided and serial numbers are marked by utilizing the rated power frequency of a power grid where a system is located, when no data is received in the current time slice, one Internet of things device in a control system can start communication data, a plurality of sending points are enabled to send the data at intervals, communication conflict is avoided, and accurate control of the system is guaranteed; meanwhile, whether the total time length falls within the period time range of the preset rated power frequency or not can be judged, whether the current power grid is abnormal or not can be judged, the judging process is simple, and the accuracy is high.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. An Internet of things communication anti-collision control method based on power grid power frequency is characterized by comprising the following steps:
s1, performing system power-on initialization;
s2, determining the power frequency of the power grid where the system is located;
s3, dividing the cycle time corresponding to the power frequency of the power grid where the system is located into a preset number of equal time slices and marking serial numbers;
and S4, the system monitors the data receiving condition of the receiving end according to the time slice serial number, and when the current serial number time slice has no data receiving, the system controls an internet of things device in the system to start communication data.
2. The power grid power frequency-based internet of things communication anti-collision control method according to claim 1, wherein the S2 specifically comprises:
s21, reading level signals input by the power frequency of the current power grid according to the same time interval;
s22, judging whether the level signal has zero-crossing change or not, recording the times of the zero-crossing change, and counting the total time length of the zero-crossing change for 3 continuous times;
and S23, determining the power frequency of the current power grid according to the total duration.
3. The power grid power frequency-based internet-of-things communication anti-collision control method according to claim 1 or 2, wherein the preset number of the time slices in the S3 is at least the sum of the number of the internet-of-things devices in the system.
4. The power grid power frequency-based internet of things communication anti-collision control method according to claim 2, wherein in the step S22, the step of judging whether the level signal has zero-crossing change specifically includes the following steps:
s221, reading a level signal input by the power frequency of the current power grid every N microseconds, and recording the level signal by using a current level value;
s222, calculating results of the front level value and the rear level value through bit XOR operation, wherein if the bit XOR operation result is larger than zero, the level signal generates zero-crossing change; if the result of the exclusive-or operation is not greater than zero, the process returns to step S221.
5. The method for controlling anti-collision of internet of things communication based on power frequency of power grid according to claim 4, wherein the result of calculating the two previous and next level values through a bit exclusive-or operation is specifically the result of calculating the current level value and the previous level value through a bit exclusive-or operation.
6. The power grid power frequency-based internet of things communication anti-collision control method according to claim 2, wherein the S23 specifically comprises:
and judging whether the total time length falls within the cycle time range of the preset rated power frequency, if so, determining that the current power grid power frequency is the corresponding rated power frequency, and if not, judging that the current power grid is abnormal.
7. The power grid power frequency-based internet-of-things communication anti-collision control method according to claim 6, wherein the preset rated power frequency is 60Hz or 50 Hz.
8. The Internet of things communication anti-collision control method based on power grid power frequency of claim 7, wherein when the power grid power frequency is 60Hz power grid power supply, the cycle range of the rated power frequency is 16.6ms +/-10%; when the power grid power frequency is 50HZ power supply, the cycle range of the rated power frequency is 20ms +/-10%.
CN202010973487.7A 2020-09-16 2020-09-16 Internet of things communication anti-collision control method based on power grid power frequency Active CN112235876B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010973487.7A CN112235876B (en) 2020-09-16 2020-09-16 Internet of things communication anti-collision control method based on power grid power frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010973487.7A CN112235876B (en) 2020-09-16 2020-09-16 Internet of things communication anti-collision control method based on power grid power frequency

Publications (2)

Publication Number Publication Date
CN112235876A true CN112235876A (en) 2021-01-15
CN112235876B CN112235876B (en) 2023-03-28

Family

ID=74106950

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010973487.7A Active CN112235876B (en) 2020-09-16 2020-09-16 Internet of things communication anti-collision control method based on power grid power frequency

Country Status (1)

Country Link
CN (1) CN112235876B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030016647A1 (en) * 2000-01-13 2003-01-23 Kenneth Margon System and method for multipoint to multipoint data communication
CN1768489A (en) * 2003-03-31 2006-05-03 松下电器产业株式会社 Radio communication method and radio communication device
CN103716293A (en) * 2012-10-25 2014-04-09 上海大学 Low voltage power line spread spectrum communication protocol employing time scale synchronization collision detection method
CN104243189A (en) * 2013-06-09 2014-12-24 海尔集团公司 Multi-device communication method based on same channel and communication system thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030016647A1 (en) * 2000-01-13 2003-01-23 Kenneth Margon System and method for multipoint to multipoint data communication
CN1768489A (en) * 2003-03-31 2006-05-03 松下电器产业株式会社 Radio communication method and radio communication device
CN103716293A (en) * 2012-10-25 2014-04-09 上海大学 Low voltage power line spread spectrum communication protocol employing time scale synchronization collision detection method
CN104243189A (en) * 2013-06-09 2014-12-24 海尔集团公司 Multi-device communication method based on same channel and communication system thereof

Also Published As

Publication number Publication date
CN112235876B (en) 2023-03-28

Similar Documents

Publication Publication Date Title
US5809013A (en) Message packet management in a wireless security system
US4298860A (en) Monitor and control apparatus
KR910007202A (en) Time stamp system
EP1478073A3 (en) System for monitoring and maintaining the provision of electrical power
CN101507125A (en) System frame number (SFN) evaluator
KR20080058454A (en) A distributed monitoring method
CN110611371A (en) System and method for testing time setting and timekeeping of distribution automation equipment
CN112235876B (en) Internet of things communication anti-collision control method based on power grid power frequency
CN106602156B (en) Power supply management method and device
CN113590007B (en) Method and device for generating progress bar, computer equipment and storage medium
CN111103554A (en) Power failure detection method, device, circuit system and computer storage medium
CN108462734A (en) Message receival method and device
US5942981A (en) Low battery detector for a wireless sensor
CN109962829B (en) System and method for transmitting updated zone status to sensors or devices
CN110007940B (en) Gray scale release verification method, system, server and readable storage medium
CN102290864A (en) Method and device for implementing virtual load management terminal
CN112888052B (en) Wireless fire alarm system with terminal awakening function and implementation method
CN109100654A (en) A kind of battery loss based reminding method and mobile terminal
CN113947827A (en) Method and device for adjusting running power consumption of door lock, electronic equipment and storage medium
CN112489663A (en) Voice wake-up method, device, medium and equipment
CN108923994A (en) A kind of communication fault detection method and device
CN112165681A (en) Direction judgment method and system based on low-energy-consumption Bluetooth
CN110509956A (en) A kind of magnetic suspension train positioning device and method
CN113766288B (en) Electric quantity prompting method, device and computer readable storage medium
CN110286742B (en) Answering machine energy-saving method and answering machine

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant