CN109195128B - Water pollution monitoring method and system by using wireless detection terminal - Google Patents
Water pollution monitoring method and system by using wireless detection terminal Download PDFInfo
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- CN109195128B CN109195128B CN201810969390.1A CN201810969390A CN109195128B CN 109195128 B CN109195128 B CN 109195128B CN 201810969390 A CN201810969390 A CN 201810969390A CN 109195128 B CN109195128 B CN 109195128B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1803—Stop-and-wait protocols
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
A water pollution monitoring method by using a wireless detection terminal comprises the following steps: collecting water pollution information by a wireless detection terminal; transmitting a communication link establishment request message to the monitoring center at a first power by the wireless detection terminal; judging whether the wireless detection terminal receives a communication link establishment response message or not; if the wireless detection terminal does not receive the communication link establishment response message, the wireless detection terminal sends a communication link establishment request message to the monitoring center at the second power; if the wireless detection terminal receives the communication link establishment response message, the wireless detection terminal sends a water pollution state report to the monitoring center with first power; judging whether the wireless detection terminal receives a water pollution state report receiving confirmation message or not; if the wireless detection terminal does not receive the water pollution status report reception confirmation message, the wireless detection terminal transmits the water pollution status report to the monitoring center again with the first power after the random waiting time.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a water pollution monitoring method and system by utilizing a wireless detection terminal.
Background
With the continuous development of social economy in China, sudden water pollution events frequently occur in recent years. The hazard degree and the influence range of sudden water pollution incidents in China tend to be increased, and according to the statistics result of the supervision department, the water pollution incidents in the country in recent years are more than 1700 per year. In 1993 to 2005, the water pollution accident accounts for about 50% of the occurrence rate of various environmental accidents, and the highest rate of the various environmental accidents is the main problem in sudden environmental accidents in China and is also the most urgent problem to be solved. Due to the sudden, urgent, and significant features of sudden water pollution events, a series of problems may result, such as pollution of the water source, panic of surrounding people, and robbery. Such as the serious pollution of Tuojiang river in 2004, serious pollution of Songhua river caused by explosion of double benzene factories of petroleum Jilin petrochemical company in 2005, pollution event of Hunan Yueyang arsenic in 2006, pollution of Jiangsu Shuyang water in 2007, and pollution event of Taihu lake water in 2007. With the increasing prominence of water environmental problems, sudden water pollution events are increasingly valued.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a water pollution monitoring method and system by utilizing a wireless detection terminal, which can overcome the defects of the prior art.
In order to achieve the above object, the present invention provides a water pollution monitoring method using a wireless detection terminal, characterized in that: the water pollution monitoring method by using the wireless detection terminal comprises the following steps:
collecting water pollution information by a wireless detection terminal;
transmitting a communication link establishment request message to the monitoring center at a first power by the wireless detection terminal;
judging whether the wireless detection terminal receives a communication link establishment response message, wherein the communication link establishment response message is sent by the monitoring center in response to receiving the communication link establishment request message;
if the wireless detection terminal does not receive the communication link establishment response message, the wireless detection terminal sends a communication link establishment request message to the monitoring center at the second power;
if the wireless detection terminal receives the communication link establishment response message, the wireless detection terminal sends a water pollution state report to the monitoring center at first power, wherein the water pollution state report at least comprises the collected water pollution information and a unique identity identifier corresponding to the wireless detection terminal;
judging whether the wireless detection terminal receives a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message is sent by a monitoring center in response to receiving the water pollution state report;
if the wireless detection terminal does not receive the water pollution status report reception confirmation message, the wireless detection terminal transmits the water pollution status report to the monitoring center again with the first power after the random waiting time.
In a preferred embodiment, the determining whether the wireless detection terminal receives the communication link establishment response message is performed by:
after the wireless detection terminal sends a communication link establishment request message to the monitoring center at a first power, starting a communication link establishment timer in the wireless detection terminal;
if the communication link establishment response message is not received before the communication link establishment timer is overtime, judging that the wireless detection terminal does not receive the communication link establishment response message, and simultaneously stopping and resetting the communication link establishment timer;
if the communication link establishment response message is received before the communication link establishment timer times out, the wireless detection terminal is judged to receive the communication link establishment response message, and the communication link establishment timer is stopped and reset at the same time.
In a preferred embodiment, the water pollution status report reception confirmation message is sent by:
after the monitoring center successfully receives the water pollution state report, the monitoring center analyzes the water pollution state report to obtain a unique identity identifier corresponding to the wireless detection terminal;
generating a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message comprises the received unique identity identifier corresponding to the wireless detection terminal;
the monitoring center broadcasts a water pollution status report receiving confirmation message.
In a preferred embodiment, the determining whether the wireless detection terminal receives the water pollution status report reception confirmation message is performed by:
after the wireless detection terminal sends a water pollution state report to the monitoring center with first power, starting a water pollution state report transmission timer in the wireless detection terminal;
if the water pollution state report receiving confirmation message is not received before the water pollution state report transmission timer is overtime, judging that the wireless detection terminal does not receive the water pollution state report receiving confirmation message, and simultaneously stopping and resetting the water pollution state report transmission timer;
if the water pollution status report reception confirmation message is received before the water pollution status report transmission timer times out, judging whether the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is consistent with the transmitted unique identity identifier corresponding to the wireless detection terminal;
if the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is identical to the transmitted unique identity identifier corresponding to the wireless detection terminal, it is judged that the wireless detection terminal receives the water pollution status report reception confirmation message, and the water pollution status report transmission timer is stopped and reset.
In a preferred embodiment, wherein different wireless detection terminals have different random latencies, and wherein the second power is higher than the first power.
The invention also discloses a water pollution monitoring system using the wireless detection terminal, which is characterized in that: the water pollution monitoring system using the wireless detection terminal includes:
a monitoring center;
at least two wireless detection terminals, wireless detection terminals are in communication connection with the monitoring center, wherein the wireless detection terminals are configured to:
collecting water pollution information;
transmitting a communication link establishment request message to the monitoring center at a first power;
judging whether the wireless detection terminal receives a communication link establishment response message, wherein the communication link establishment response message is sent by the monitoring center in response to receiving the communication link establishment request message;
if the wireless detection terminal does not receive the communication link establishment response message, sending a communication link establishment request message to the monitoring center at the second power;
if the wireless detection terminal receives the communication link establishment response message, transmitting a water pollution state report to the monitoring center at a first power, wherein the water pollution state report at least comprises the collected water pollution information and a unique identity identifier corresponding to the wireless detection terminal;
judging whether the wireless detection terminal receives a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message is sent by a monitoring center in response to receiving the water pollution state report;
if the wireless detection terminal does not receive the water pollution state report receiving confirmation message, the wireless detection terminal sends the water pollution state report to the monitoring center again with the first power after the random waiting time.
In a preferred embodiment, the determining whether the wireless detection terminal receives the communication link establishment response message is performed by:
after the wireless detection terminal sends a communication link establishment request message to the monitoring center at a first power, starting a communication link establishment timer in the wireless detection terminal;
if the communication link establishment response message is not received before the communication link establishment timer is overtime, judging that the wireless detection terminal does not receive the communication link establishment response message, and simultaneously stopping and resetting the communication link establishment timer;
if the communication link establishment response message is received before the communication link establishment timer times out, the wireless detection terminal is judged to receive the communication link establishment response message, and the communication link establishment timer is stopped and reset at the same time.
In a preferred embodiment, the water pollution status report reception confirmation message is sent by:
after the monitoring center successfully receives the water pollution state report, the monitoring center analyzes the water pollution state report to obtain a unique identity identifier corresponding to the wireless detection terminal;
generating a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message comprises the received unique identity identifier corresponding to the wireless detection terminal;
the monitoring center broadcasts a water pollution status report receiving confirmation message.
In a preferred embodiment, the determining whether the wireless detection terminal receives the water pollution status report reception confirmation message is performed by:
after the wireless detection terminal sends a water pollution state report to the monitoring center with first power, starting a water pollution state report transmission timer in the wireless detection terminal;
if the water pollution state report receiving confirmation message is not received before the water pollution state report transmission timer is overtime, judging that the wireless detection terminal does not receive the water pollution state report receiving confirmation message, and simultaneously stopping and resetting the water pollution state report transmission timer;
if the water pollution status report reception confirmation message is received before the water pollution status report transmission timer times out, judging whether the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is consistent with the transmitted unique identity identifier corresponding to the wireless detection terminal;
if the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is identical to the transmitted unique identity identifier corresponding to the wireless detection terminal, it is judged that the wireless detection terminal receives the water pollution status report reception confirmation message, and the water pollution status report transmission timer is stopped and reset.
In a preferred embodiment, wherein different wireless detection terminals have different random latencies, and wherein the second power is higher than the first power.
Compared with the prior art, the invention has the following advantages: with advances in science and technology, many water pollution monitoring systems have evolved to wireless communication device-based systems. It is well known that several major problems to be considered in wireless communication systems are: contention resolution, fading, and frequency shifting. The solution of the prior art for contention resolution of a water pollution monitoring system based on a wireless network generally comprises the following steps: the transmission power is first determined by communication with a monitoring center (central server), and then increased whenever a transmission failure occurs, regardless of the cause of the transmission failure. This method of operation results in an undue increase in the transmission power of many transmissions, which results in reduced channel utilization. The invention designs a method for distinguishing the transmission failure reasons aiming at the problems in the prior art, and can realize the transmission failure aiming at different reasons, apply transmission power with different magnitudes and improve the channel efficiency.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
FIG. 1 is a flow chart of a method according to an embodiment of the invention. As shown, the method of the present invention comprises the steps of:
step 101: collecting water pollution information by a wireless detection terminal;
step 102: transmitting a communication link establishment request message to the monitoring center at a first power by the wireless detection terminal;
step 103: judging whether the wireless detection terminal receives a communication link establishment response message, wherein the communication link establishment response message is sent by the monitoring center in response to receiving the communication link establishment request message;
step 104: if the wireless detection terminal does not receive the communication link establishment response message, the wireless detection terminal sends a communication link establishment request message to the monitoring center at the second power;
step 105: if the wireless detection terminal receives the communication link establishment response message, the wireless detection terminal sends a water pollution state report to the monitoring center at first power, wherein the water pollution state report at least comprises the collected water pollution information and a unique identity identifier corresponding to the wireless detection terminal;
step 106: judging whether the wireless detection terminal receives a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message is sent by a monitoring center in response to receiving the water pollution state report;
step 107: if the wireless detection terminal does not receive the water pollution status report reception confirmation message, the wireless detection terminal transmits the water pollution status report to the monitoring center again with the first power after the random waiting time.
In a preferred embodiment, the determining whether the wireless detection terminal receives the communication link establishment response message is performed by:
after the wireless detection terminal sends a communication link establishment request message to the monitoring center at a first power, starting a communication link establishment timer in the wireless detection terminal;
if the communication link establishment response message is not received before the communication link establishment timer is overtime, judging that the wireless detection terminal does not receive the communication link establishment response message, and simultaneously stopping and resetting the communication link establishment timer;
if the communication link establishment response message is received before the communication link establishment timer times out, the wireless detection terminal is judged to receive the communication link establishment response message, and the communication link establishment timer is stopped and reset at the same time.
In a preferred embodiment, the water pollution status report reception confirmation message is sent by:
after the monitoring center successfully receives the water pollution state report, the monitoring center analyzes the water pollution state report to obtain a unique identity identifier corresponding to the wireless detection terminal;
generating a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message comprises the received unique identity identifier corresponding to the wireless detection terminal;
the monitoring center broadcasts a water pollution status report receiving confirmation message.
In a preferred embodiment, the determining whether the wireless detection terminal receives the water pollution status report reception confirmation message is performed by:
after the wireless detection terminal sends a water pollution state report to the monitoring center with first power, starting a water pollution state report transmission timer in the wireless detection terminal;
if the water pollution state report receiving confirmation message is not received before the water pollution state report transmission timer is overtime, judging that the wireless detection terminal does not receive the water pollution state report receiving confirmation message, and simultaneously stopping and resetting the water pollution state report transmission timer;
if the water pollution status report reception confirmation message is received before the water pollution status report transmission timer times out, judging whether the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is consistent with the transmitted unique identity identifier corresponding to the wireless detection terminal;
if the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is identical to the transmitted unique identity identifier corresponding to the wireless detection terminal, it is judged that the wireless detection terminal receives the water pollution status report reception confirmation message, and the water pollution status report transmission timer is stopped and reset.
In a preferred embodiment, wherein different wireless detection terminals have different random latencies, and wherein the second power is higher than the first power.
The invention also discloses a water pollution monitoring system using the wireless detection terminal, which is characterized in that: the water pollution monitoring system using the wireless detection terminal includes:
a monitoring center;
at least two wireless detection terminals, wireless detection terminals are in communication connection with the monitoring center, wherein the wireless detection terminals are configured to:
collecting water pollution information;
transmitting a communication link establishment request message to the monitoring center at a first power;
judging whether the wireless detection terminal receives a communication link establishment response message, wherein the communication link establishment response message is sent by the monitoring center in response to receiving the communication link establishment request message;
if the wireless detection terminal does not receive the communication link establishment response message, sending a communication link establishment request message to the monitoring center at the second power;
if the wireless detection terminal receives the communication link establishment response message, transmitting a water pollution state report to the monitoring center at a first power, wherein the water pollution state report at least comprises the collected water pollution information and a unique identity identifier corresponding to the wireless detection terminal;
judging whether the wireless detection terminal receives a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message is sent by a monitoring center in response to receiving the water pollution state report;
if the wireless detection terminal does not receive the water pollution state report receiving confirmation message, the wireless detection terminal sends the water pollution state report to the monitoring center again with the first power after the random waiting time.
It should be noted that, since the present invention is a monitoring system based on wireless communication, there is a limited communication range between the monitoring center and the wireless detection terminal, and the size of the communication range depends on the transmission power and the surrounding environment of the monitoring center and the wireless detection terminal (for example, when monitoring water quality in some remote areas, the communication range may reach several kilometers or even tens of kilometers). The invention refers to a system, which is a monitoring center and a plurality of wireless detection terminals belonging to the communication range of the monitoring center.
In a preferred embodiment, the determining whether the wireless detection terminal receives the communication link establishment response message is performed by:
after the wireless detection terminal sends a communication link establishment request message to the monitoring center at a first power, starting a communication link establishment timer in the wireless detection terminal;
if the communication link establishment response message is not received before the communication link establishment timer is overtime, judging that the wireless detection terminal does not receive the communication link establishment response message, and simultaneously stopping and resetting the communication link establishment timer;
if the communication link establishment response message is received before the communication link establishment timer times out, the wireless detection terminal is judged to receive the communication link establishment response message, and the communication link establishment timer is stopped and reset at the same time.
In a preferred embodiment, the water pollution status report reception confirmation message is sent by:
after the monitoring center successfully receives the water pollution state report, the monitoring center analyzes the water pollution state report to obtain a unique identity identifier corresponding to the wireless detection terminal;
generating a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message comprises the received unique identity identifier corresponding to the wireless detection terminal;
the monitoring center broadcasts a water pollution status report receiving confirmation message.
In a preferred embodiment, the determining whether the wireless detection terminal receives the water pollution status report reception confirmation message is performed by:
after the wireless detection terminal sends a water pollution state report to the monitoring center with first power, starting a water pollution state report transmission timer in the wireless detection terminal;
if the water pollution state report receiving confirmation message is not received before the water pollution state report transmission timer is overtime, judging that the wireless detection terminal does not receive the water pollution state report receiving confirmation message, and simultaneously stopping and resetting the water pollution state report transmission timer;
if the water pollution status report reception confirmation message is received before the water pollution status report transmission timer times out, judging whether the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is consistent with the transmitted unique identity identifier corresponding to the wireless detection terminal;
if the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is identical to the transmitted unique identity identifier corresponding to the wireless detection terminal, it is judged that the wireless detection terminal receives the water pollution status report reception confirmation message, and the water pollution status report transmission timer is stopped and reset.
In a preferred embodiment, wherein different wireless detection terminals have different random latencies, and wherein the second power is higher than the first power.
The various modules and circuits described in connection with the present invention may be implemented with a general purpose processor, an application specific integrated circuit, a field programmable gate array, or discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, which may be any commercially available processor, controller, microcontroller or state machine. The processor may be responsible for managing the bus and general processing, including the execution of software stored on a machine-readable medium. A processor may be implemented with one or more general-purpose and/or special-purpose processors. Whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, software should be construed broadly to mean instructions, data, or any combination thereof. By way of example, the machine-readable medium may comprise RAM, flash memory, ROM, PROM, EPROM, EEPROM, registers, magnetic disks, optical disks, or any combination thereof. In a hardware implementation, the machine-readable medium may be part of a processing system that is separate from the processor.
The wireless link of the present invention is based on a wireless communication system including a communication system based on an orthogonal multiplexing scheme. Examples of such communication systems include Space Division Multiple Access (SDMA) systems, time Division Multiple Access (TDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, and single carrier frequency division multiple access (SC-FDMA) systems. SDMA systems may utilize sufficiently different directions to simultaneously transmit data belonging to multiple user terminals. TDMA systems may allow multiple user terminals to share the same frequency channel by dividing the transmitted signal into different time slots and assigning each time slot to a different user terminal. OFDMA systems utilize Orthogonal Frequency Division Multiplexing (OFDM), which is a modulation technique that divides the overall system bandwidth into multiple orthogonal subcarriers. These subcarriers may also be referred to as tones, bins, etc. With OFDM, each subcarrier can be modulated independently with data. SC-FDMA systems may utilize Interleaved FDMA (IFDMA) to transmit on subcarriers distributed across the system bandwidth, localized FDMA (LFDMA) to transmit on blocks of adjacent subcarriers, or Enhanced FDMA (EFDMA) to transmit on multiple blocks of adjacent subcarriers. Typically, the modulation symbols are transmitted in the frequency domain in OFDM fashion and in the time domain in SC-FDMA fashion.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (2)
1. A water pollution monitoring method by using a wireless detection terminal is characterized in that: the water pollution monitoring method by using the wireless detection terminal comprises the following steps:
collecting water pollution information by a wireless detection terminal;
transmitting a communication link establishment request message to a monitoring center at a first power by the wireless detection terminal;
judging whether the wireless detection terminal receives a communication link establishment response message, wherein the communication link establishment response message is sent by the monitoring center in response to receiving the communication link establishment request message;
if the wireless detection terminal does not receive the communication link establishment response message, the wireless detection terminal sends a communication link establishment request message to a monitoring center at a second power;
if the wireless detection terminal receives a communication link establishment response message, the wireless detection terminal sends a water pollution state report to the monitoring center with first power, wherein the water pollution state report at least comprises the collected water pollution information and a unique identity identifier corresponding to the wireless detection terminal;
judging whether the wireless detection terminal receives a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message is sent by the monitoring center in response to receiving the water pollution state report;
if the wireless detection terminal does not receive the water pollution status report reception confirmation message, after a random waiting time, the wireless detection terminal transmits a water pollution status report to the monitoring center again with a first power,
wherein, judging whether the wireless detection terminal receives the communication link establishment response message is carried out by the following steps:
after the wireless detection terminal sends a communication link establishment request message to a monitoring center with first power, starting a communication link establishment timer in the wireless detection terminal;
if the communication link establishment response message is not received before the communication link establishment timer is overtime, judging that the wireless detection terminal does not receive the communication link establishment response message, and simultaneously stopping and resetting the communication link establishment timer;
if the communication link setup response message is received before the communication link setup timer times out, it is judged that the wireless detecting terminal receives the communication link setup response message, while stopping and resetting the communication link setup timer,
wherein, the water pollution status report receipt confirmation message is sent by the following steps:
after the monitoring center successfully receives the water pollution state report, analyzing the water pollution state report by the monitoring center to obtain the unique identity identifier corresponding to the wireless detection terminal;
generating a water pollution status report reception confirmation message, wherein the water pollution status report reception confirmation message comprises the received unique identity identifier corresponding to the wireless detection terminal;
broadcasting by the monitoring center the water pollution status report reception confirmation message,
wherein, judging whether the wireless detection terminal receives the water pollution state report receiving confirmation message is carried out by the following steps:
after the wireless detection terminal sends a water pollution state report to the monitoring center with first power, starting a water pollution state report transmission timer in the wireless detection terminal;
if the water pollution state report receiving confirmation message is not received before the water pollution state report transmission timer is overtime, judging that the wireless detection terminal does not receive the water pollution state report receiving confirmation message, and simultaneously stopping and resetting the water pollution state report transmission timer;
if the water pollution status report reception confirmation message is received before the water pollution status report transmission timer times out, judging whether a unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is consistent with the transmitted unique identity identifier corresponding to the wireless detection terminal;
if the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is identical to the transmitted unique identity identifier corresponding to the wireless detection terminal, it is judged that the wireless detection terminal receives the water pollution status report reception confirmation message, while stopping and resetting the water pollution status report transmission timer,
wherein different wireless detection terminals have different random latencies, and wherein the second power is higher than the first power.
2. A water pollution monitoring system utilizing a wireless detection terminal is characterized in that: the water pollution monitoring system using the wireless detection terminal includes:
a monitoring center;
at least two wireless detection terminals in communication with the monitoring center, wherein the wireless detection terminals are configured to:
collecting water pollution information;
transmitting a communication link establishment request message to the monitoring center at a first power;
judging whether the wireless detection terminal receives a communication link establishment response message, wherein the communication link establishment response message is sent by the monitoring center in response to receiving the communication link establishment request message;
if the wireless detection terminal does not receive the communication link establishment response message, sending a communication link establishment request message to a monitoring center with second power;
if the wireless detection terminal receives a communication link establishment response message, transmitting a water pollution status report to the monitoring center at a first power, wherein the water pollution status report at least comprises the collected water pollution information and a unique identity identifier corresponding to the wireless detection terminal;
judging whether the wireless detection terminal receives a water pollution state report reception confirmation message, wherein the water pollution state report reception confirmation message is sent by the monitoring center in response to receiving the water pollution state report;
if the wireless detection terminal does not receive the water pollution status report reception confirmation message, after a random waiting time, transmitting a water pollution status report to the monitoring center again at a first power,
wherein, judging whether the wireless detection terminal receives the communication link establishment response message is carried out by the following steps:
after the wireless detection terminal sends a communication link establishment request message to a monitoring center with first power, starting a communication link establishment timer in the wireless detection terminal;
if the communication link establishment response message is not received before the communication link establishment timer is overtime, judging that the wireless detection terminal does not receive the communication link establishment response message, and simultaneously stopping and resetting the communication link establishment timer;
if the communication link setup response message is received before the communication link setup timer times out, it is judged that the wireless detecting terminal receives the communication link setup response message, while stopping and resetting the communication link setup timer,
wherein, the water pollution status report receipt confirmation message is sent by the following steps:
after the monitoring center successfully receives the water pollution state report, analyzing the water pollution state report by the monitoring center to obtain the unique identity identifier corresponding to the wireless detection terminal;
generating a water pollution status report reception confirmation message, wherein the water pollution status report reception confirmation message comprises the received unique identity identifier corresponding to the wireless detection terminal;
broadcasting by the monitoring center the water pollution status report reception confirmation message,
wherein, judging whether the wireless detection terminal receives the water pollution state report receiving confirmation message is carried out by the following steps:
after the wireless detection terminal sends a water pollution state report to the monitoring center with first power, starting a water pollution state report transmission timer in the wireless detection terminal;
if the water pollution state report receiving confirmation message is not received before the water pollution state report transmission timer is overtime, judging that the wireless detection terminal does not receive the water pollution state report receiving confirmation message, and simultaneously stopping and resetting the water pollution state report transmission timer;
if the water pollution status report reception confirmation message is received before the water pollution status report transmission timer times out, judging whether a unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is consistent with the transmitted unique identity identifier corresponding to the wireless detection terminal;
if the unique identity identifier corresponding to the wireless detection terminal included in the water pollution status report reception confirmation message is identical to the transmitted unique identity identifier corresponding to the wireless detection terminal, it is judged that the wireless detection terminal receives the water pollution status report reception confirmation message, while stopping and resetting the water pollution status report transmission timer,
wherein different wireless detection terminals have different random latencies, and wherein the second power is higher than the first power.
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