CN115696254A - Big data transmission method of wireless sensor network - Google Patents
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Abstract
The invention discloses a big data transmission method of a wireless sensor network, which comprises the following steps: the network manager receives the request frame and allocates a network channel to the wireless sensor in a multi-hop transmission mode; the network manager schedules network data for parallel transmission in a parent-child link time sequence rotation mode, so that a root node is always in a receiving state in a data transmission stage. According to the invention, time sequence compensation is carried out on network beacons of nodes at all levels during data transmission, synchronous triggering of data transmission commands by nodes in the whole network is realized, network channel allocation is carried out on the nodes with minimized adjacent frequency interference as a target by analyzing the channel interference condition during wireless sensor network transmission, and scheduling is carried out in a parent-child link time sequence rotation mode, so that the nodes are always in a receiving state in a data transmission stage, the interference on the wireless sensor network during large data transmission is effectively reduced, and the transmission rate of the large data in the wireless sensor network is improved.
Description
Technical Field
The invention relates to the technical field of wireless data transmission, in particular to a big data transmission method of a wireless sensor network.
Background
With the development of society and the progress of knowledge system, the internet of things raises the heat of a new generation of information technology, and has huge application prospect and commercial value in the future, wherein a wireless sensor network is an important component in the internet of things, remote data acquisition, monitoring, detection, control and other operations can be realized by utilizing the wireless sensor network, and the wireless sensor network shows wide application prospect in the fields of environment perception and monitoring, wireless positioning and tracking, medical monitoring, intelligent home furnishing and the like, so that the wireless sensor network serving as the key technology of the internet of things must become one of key technologies for research and development;
the wireless sensor network protocol is the basis of the wireless sensor network and is responsible for establishing, maintaining and managing the normal operation and work of the wireless sensor network, and the protocols adopted by the current wireless sensor network are Zigbee, wirelessHart, WIAPA and the like.
The prior art has the following defects: when the existing wireless sensor transmits data, time sequence compensation is not carried out between network beacons of nodes at all levels, so that the nodes of a network cannot synchronously trigger a data transmission command, and a network manager does not distribute network channels of the wireless sensor, so that the network manager cannot be in a receiving state all the time, the wireless sensor network is easily interfered during large data transmission, and the transmission rate of the large data of the wireless sensor network is reduced.
Disclosure of Invention
The invention aims to provide a big data transmission method of a wireless sensor network, which aims to solve the defects in the background technology.
In order to achieve the above purpose, the invention provides the following technical scheme: a big data transmission method of a wireless sensor network, the transmission method comprising the following steps:
s1: after the wireless sensor nodes collect data, request frames are sent to a network manager through a node network, and the network manager carries out time sequence compensation on network beacons of all nodes;
s2: the network manager receives the request frame and allocates a network channel to the wireless sensor in a multi-hop transmission mode;
s3: the network manager schedules network data for parallel transmission in a parent-child link time sequence rotation mode, so that a root node is always in a receiving state in a data transmission stage;
s4: the receiving node of the network manager sends a reply frame back to the received data packet.
Preferably, in the multi-hop transmission mode, the routing node establishes a transmission link to forward data between the child node and the parent node, and the step of establishing the transmission link is: and the whole network node is kept in a clock synchronization state by adopting a channel switching strategy of clock synchronization transmission, and when the channel is switched, the routing node and the father node and the son node predetermine link switching time in advance.
Preferably, the scheduling method for parent-child link time sequence rotation includes the following steps:
s3.1: transmitting and transmitting states of each node are staggered;
s3.2: the network routing node sends data to the father node when the subordinate child routing node is in a data receiving state, and meanwhile, the data is received in time when the child node needs to send the data.
Preferably, the wireless sensor network comprises a network manager, a repeater and a sensor node, wherein the network manager is used for maintaining and managing the network, the repeater is used for wireless communication transmission of data, and the sensor node is a terminal device and is used for executing data acquisition, monitoring, detection and control operations.
Preferably, the data transmission of the wireless sensor network comprises the following steps:
s1.1: when the sensor node sends big data, sending a long-time slot occupation request frame;
s1.2: after receiving the long time slot occupation request frame, the network manager allocates the long time slot occupied by the sensor node to the sensor node occupation and sends a long time slot configuration communication frame;
s1.3: the sensor node receives the long time slot configuration communication frame, enters a data transmission mode to send big data when entering the long time slot occupied by the sensor node, and enters a sleep mode when leaving the long time slot occupied by the sensor node;
s1.4: the network manager receives large data in a long time slot occupied by the sensor node.
Preferably, the wireless sensor node includes a data acquisition module, a data processing module, a wireless communication module and an energy supply module, the data acquisition module is used for acquiring and converting data, the data processing module is used for processing and storing data, the wireless communication module is used for exchanging data information and control information with the node, and the energy supply module is used for supplying energy for the operation of each part of the node.
Preferably, the data acquisition module comprises a sensitive element module and an AD/DC converter, the sensitive element module acquires data, and the AD/DC converter converts analog quantity and digital quantity of the data;
the data processing module comprises a microprocessor module and a memory module, the microprocessor module processes data, and the memory module stores the processed data;
the wireless communication module comprises a wireless transceiver, an MAC module and a network module, and the wireless transceiver, the MAC module and the network module are electrically connected;
the energy supply module is a micro storage battery which is used for supplying power.
Preferably, the wireless sensor network protocol stack includes a physical layer, a data link layer, a network layer, a transport layer and an application layer;
the physical layer is used for sampling and quantizing data information, modulating signals and transmitting and receiving data;
the network layer is used for selecting a transmission path and maintaining and updating the transmission path;
the transport layer is used to control the transmission of data streams and manage the establishment, maintenance and cancellation of transport connections.
Preferably, the energy consumption formula of the energy supply module is as follows:
wherein the content of the first and second substances,
in formula (1), x is the number of bytes of the transmitted data packet, b is the transmission distance, and when the transmission distance b is less than the threshold b 0 The transmitted power is in free space mode, otherwise, in multipath fading mode, W elec (nJ/bit) is the radio frequency energy consumption coefficient; epsilon fs And ε mp The power consumption coefficients of the circuit amplifier under the two modes are respectively.
Preferably, when the wireless sensor network data is transmitted, the receiving side returns a response frame containing a corresponding packet sequence number for each received data frame, and if the sending side does not receive the response frame of the sent data frame within a specified time period, the sending side considers that the transmission of the corresponding data frame fails, and retransmits the data frame.
In the technical scheme, the invention provides the following technical effects and advantages:
1. according to the invention, time sequence compensation is carried out on network beacons of nodes at all levels during data transmission, synchronous triggering of data transmission commands by nodes in the whole network is realized, network channel allocation is carried out on the nodes with minimized adjacent frequency interference as a target by analyzing the channel interference condition during wireless sensor network transmission, and scheduling is carried out in a parent-child link time sequence rotation mode, so that the nodes are always in a receiving state in a data transmission stage, the interference on the wireless sensor network during large data transmission is effectively reduced, and the transmission rate of the large data in the wireless sensor network is improved.
2. The invention comprises the following steps: the receiving side returns a response frame containing a corresponding packet sequence number for each received data frame to indicate that the data frame is successfully transmitted by the sending side, if the data frame or the response frame is lost in transmission and the sending side does not receive the response frame of the sent data frame within a specified time, the corresponding data frame is considered to be failed in transmission and the data frame is immediately retransmitted, wherein if the data retransmission is caused by the failure of the response frame, the receiving side receives the data packets with the same sequence number twice, and identifies the data packets and eliminates the repeated data packets, so that the stability of data transmission is improved.
3. The invention adopts the channel switching strategy of clock synchronous transmission, the nodes of the whole network keep the clock synchronous state, and the routing node needing to switch the channel can reserve the link switching time with the father node and the son node in advance, thereby canceling the introduction of RTS frame and CTS frame, avoiding unnecessary waiting time delay of the sending node, further improving the transmission efficiency of data,
4. in the sleep mode, the sensor node only performs data acquisition, the sleep mode aims at data transmission, the data transmission mode needs high power consumption, when the data transmission is not performed, the power consumption of the data transmission mode can be saved when the data sending part of the sensor node enters the sleep mode, the power consumption of the data acquisition is very low, the data acquisition can be performed in the sleep mode, the power consumption of the sensor node can be saved in the sleep mode, and the service life of the sensor node is prolonged.
5. According to the invention, the overlapping coverage area between clusters is reduced as much as possible according to the node degree and the distance between the node degree and the regional center, and the cluster heads are replaced in a rotating manner, so that the energy consumption of the sensor node on the energy supply module is reduced, and the network life cycle of the wireless sensor is prolonged.
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In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a flow chart of a network transmission method of a wireless sensor according to the present invention.
Fig. 2 is a schematic node structure of the wireless sensor according to the present invention.
FIG. 3 is a flowchart of a root node classification algorithm of the present invention.
Fig. 4 is a schematic diagram of a wireless sensor network protocol stack according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a big data transmission method of a wireless sensor network according to this embodiment includes the following steps:
after the wireless sensor node collects data, a request frame is sent to a network manager through a node network;
when the node network sends a request frame to the network manager, the network beacons of all levels carry out time sequence compensation, synchronous triggering of all nodes of the whole network on a data transmission command is realized, and basic conditions are provided for synchronous scheduling of data transmission.
The network manager receives the request frame and allocates a network channel to the wireless sensor in a multi-hop transmission mode;
the network manager performs network channel allocation aiming at minimizing adjacent channel interference on the nodes by analyzing the channel interference condition during wireless sensor network transmission in a multi-hop transmission mode, and avoids unreasonable reduction of network transmission rate due to channel allocation.
The network manager schedules network data for parallel transmission, so that a root node is always in a receiving state in a data transmission stage;
and scheduling the network data by adopting a parent-child link time sequence rotation mode, so that the root node is always in a receiving state in the data transmission stage, and the network transmission rate is maximized.
The receiving node of the network manager sends the reply frame to the received data packet;
the receiving node sends all the received data packets back to the multiframe to inform the sender of successful receiving, and if the sender does not receive the multiframe, the data packets are retransmitted.
The method has the advantages that the packet loss phenomenon can occur during data transmission of the wireless sensor network, and the data transmission reliability is ensured through the following steps:
(1) The receiving party returns a response frame containing a corresponding packet sequence number for each received data frame, and the response frame indicates that the data frame is successfully transmitted by the sending party.
(2) If the data frame or the response frame is lost in transmission and the sender does not receive the response frame of the sent data frame within the specified time, the corresponding data frame is considered to be failed in transmission, and the data frame is immediately retransmitted.
If the data retransmission is caused by the failure of the response frame, the receiving party receives the data packets with the same sequence number twice, and the receiving party identifies the data packets and eliminates the repeated data packets.
According to the method, time sequence compensation is carried out on network beacons of nodes at all levels during data transmission, synchronous triggering of nodes on data transmission commands of the whole network is achieved, channel interference conditions during transmission of the wireless sensor network are analyzed, network channel allocation is carried out on the nodes with minimized adjacent frequency interference as a target in a multi-hop transmission mode, and scheduling is carried out in a parent-child link time sequence rotation mode, so that the nodes are always in a receiving state in a data transmission stage, interference on the wireless sensor network during large data transmission is effectively reduced, and the transmission rate of the large data of the wireless sensor network is improved.
Under the node network beacon mode, each level of routing nodes periodically broadcast networking beacons, child nodes track father node beacons to keep clock synchronization in a single hop, on the premise of synchronous scheduling of the whole network, the nodes can be in a data transmission state in the whole scheduling period, and the effective transmission time can be greatly prolonged and the transmission rate can be improved by adopting a non-beacon mode in the data transmission stage.
The node network beacon transmits data by the following steps:
(1) The acquisition network is built in a beacon mode network, routing nodes at all levels periodically broadcast networking beacons, and child nodes track parent node beacons to keep clock synchronization in single hop;
(2) A beacon timing sequence compensation mechanism is adopted to complete synchronous triggering of transmission commands in multiple hops and high-precision acquisition of data;
(3) The network is converted into a non-beacon mode, beacon frames sent periodically in the network are cancelled to maximize the effective transmission time, the data transmission rate is improved, a top-down time sequence scheduling method is adopted to coordinate each node of the network to perform multi-channel parallel data transmission, and a packet loss detection retransmission mechanism is adopted to ensure the reliability of data transmission.
In the multi-hop transmission mode, a routing node is responsible for forwarding data between a child node and a parent node, however, when multi-channel transmission is performed, data reception of the parent node and data transmission of the child node in a transmission link are in different channels, which requires that the routing node switches between transmission channels of both parties to establish the transmission link, and the step of establishing the transmission link is as follows:
(1) Adopting a channel switching strategy of clock synchronous transmission;
(2) The whole network node keeps a clock synchronization state;
(3) The routing node needing channel switching can reserve link switching time with father and son nodes in advance, thereby canceling the introduction of RTS frame and CTS frame, avoiding unnecessary waiting time delay of the sending node and further improving the transmission efficiency of data.
The scheduling method of the parent-child link time sequence rotation comprises the following steps:
(1) Transmitting and transmitting states of each node are staggered;
(2) The network routing node sends data to a father node when a subordinate child routing node of the network routing node is in a data receiving state, and meanwhile, the network routing node receives the data in time when the child routing node of the network routing node needs to send the data.
As the wireless sensor network adopts a cluster tree topological structure, the data transmission states of parent and child nodes are necessarily opposite in actual scheduling, and once the transmission time sequence of the parent node is determined, the time sequence of the child node is also determined, so that the transmission time sequence is determined layer by layer through the cycle scheduling of parent and child link time sequences in a top-down mode.
Referring to fig. 3, first, the number N of network root nodes is counted to form a root node list S i And the collection nodes in the root nodes are placed at the front end of the list.
Secondly, the network upper computer counts the transmission data volume D of each root node according to the transmitted acquisition command i ＝∑T j (T j Is S i The data volume of the next jth collection node), the root nodes are divided into two types of omega according to the transmission data volume A And Ω B So that Ω A Sum of data amounts D A And omega B Data volume and D B The two types of the root nodes transmit in turn and the transmission time is approximately equal.
Setting T A The root node starts the transmission sequence with the transmission state, T B Starting from a receiving state, if the node has no data to transmit, entering a sleep mode to save energy, determining a transmission time sequence for a child node by using an opposite time sequence after determining a transmission time sequence of a root node, performing layer-by-layer round-robin scheduling until the time sequence distribution of the whole network is completed, and switching a transmitting/receiving state by using a period of 500ms for each node until the data transmission is completed.
When the gateway node is in a sending state, the data sending is set to be finished 20ms in advance, and a network is established on a self receiving channel to prepare for receiving the data uploaded by the child node.
Example 2
The wireless sensor network comprises a network manager, a repeater and a sensor node.
Wherein the content of the first and second substances,
the network manager is responsible for maintaining and managing the whole network;
the repeater is responsible for the relay transmission of data and is used for expanding the wireless communication distance;
the sensor nodes are terminal equipment and perform operations such as data acquisition, monitoring, detection, control and the like.
In this embodiment, the applicable network topology may include a star network, a tree network, a chain network, and the like.
Wherein the content of the first and second substances,
the star network can be composed of a network manager and sensor nodes, the tree network and the chain network can be composed of a network manager, a repeater and sensor nodes, the network topology structures all adopt the network manager, the repeater and terminal equipment,
therefore, according to the description of the embodiment, by executing the method of the embodiment of the invention on the network manager, the repeater and the terminal device, the wireless network data transmission with large data and low power consumption in various network topologies can be realized.
Due to the fact that in practical application scenarios, the wireless sensor network is ubiquitous: the sensor node is in a low-power-consumption working state for most of the time (for example, collects and sends a packet of characteristic value data every 30 minutes or even longer), and after accumulating a certain time or after the characteristic value collection reaches a trigger threshold, a larger complete data packet is sent, wherein the larger complete data packet comprises acceleration data, strain data, pressure data, temperature data and the like collected within a period of time, for example, so that the data sending power consumption of the wireless sensor network is increased.
Therefore, in this embodiment, the data transmission power consumption of the wireless sensor network is reduced by the following steps:
(1) When a sensor node needs to send big data, sending a long-slot occupation request frame;
(2) After receiving the long time slot occupation request frame, the network manager allocates the long time slot which can be occupied by the sensor node to the occupation of the sensor node and sends a long time slot configuration communication frame;
(3) After receiving the long-time-slot configuration communication frame, the sensor node enters a data transmission mode to send big data when entering the occupiable long time slot, and enters a sleep mode when leaving the occupiable long time slot;
(4) The network manager receives large data in a long time slot that the sensor node may occupy.
The sensor node sends a long time slot occupation request frame and receives a long time slot configuration communication frame in the inherent communication time slot;
if the sensor node is in the inherent communication time slot or the occupiable long time slot, the sensor node is in a data transmission mode, otherwise, the sensor node is in a sleep mode.
In the sleep mode, the sensor node only performs data acquisition, the sleep mode is that for data transmission, the data transmission mode needs high power consumption, and when the data transmission is not performed, the data sending part of the sensor node enters the sleep mode to save the power consumption of the data transmission mode, and the power consumption of the data acquisition is very low, which can be performed in the sleep mode, so that the sensor node can save the power consumption in the sleep mode, and the service life of the sensor node is prolonged.
The inherent communication time slot refers to a communication time slot which is respectively allocated to each sensor node by a network manager in a broadcast period, and for each sensor node in the wireless sensor network, in a broadcast period, there is one occupied communication time slot which is used for data communication of the sensor node in the broadcast period.
In the embodiment, at least one stage of repeater is arranged between the network manager and the sensor node, and the sensor node and the network manager are communicated through the at least one stage of repeater;
after receiving the long-time slot occupation request frame from the sensor node, the repeater forwards the long-time slot occupation request frame to the previous-stage equipment;
after receiving the long-time-slot configuration communication frame, the repeater allocates the long time slot which can be occupied by the sensor node to occupy, and forwards the long-time-slot configuration communication frame to the next-level equipment;
the repeater receives big data in a long time slot which can be occupied by the sensor node and forwards the big data to the upper-level equipment;
the upper-level equipment is an upper-level repeater or a network manager, and the lower-level equipment is a lower-level repeater or a sensor node.
Example 3
Referring to fig. 2, the wireless sensor node includes a data acquisition module, a data processing module, a wireless communication module, and an energy supply module.
Wherein, the first and the second end of the pipe are connected with each other,
(1) The data acquisition module consists of various types of sensitive element modules and an AD/DC converter, acquires environmental data, and then converts analog quantity and digital quantity by using the converter.
(2) The data processing module comprises a microprocessor module and a memory module, the microprocessor module further processes the data collected by the data acquisition module and the data from other nodes, and the memory module is responsible for storing the data.
(3) The wireless communication module mainly comprises a wireless transceiver, an MAC module and a network module, and has the main task of exchanging data information and control information with other nodes, and the wireless communication module generally has four states, namely a transmission state, a receiving state, a waiting state and a dormant state, and the transmission energy consumption of the wireless communication module is in direct proportion to the n-th power of the transmission distance.
(4) The energy supply module is generally composed of a micro storage battery and is responsible for supplying energy for the work of each part of the node and ensuring the normal operation of each module.
Referring to fig. 4, a wireless sensor network protocol stack includes a physical layer, a data link layer, a network layer, a transport layer, and an application layer, and provides software support for communication between nodes, and in addition, platforms such as security management, energy management, and topology control are provided to support efficient operation of sensor nodes.
Wherein the content of the first and second substances,
(1) The physical layer is used for sampling and quantifying data information, modulating signals, sending and receiving data, standardizing data transmission media and working frequency bands, and the transmission media used by the physical layer mainly comprise sound waves, light waves, radio waves, electromagnetic waves and the like.
(2) The data link layer consists of a medium access control protocol, including channel multiplexing, monitoring frame structure, media intervention, and error control.
(3) The network layer is used to select a suitable transmission path, and maintain and update the path, and many scholars propose various routing protocols for different scenes and optimization objectives because the selection of the path directly influences the ratio of effective data transmission.
(4) The transport layer is used for controlling data stream transmission, managing establishment, maintenance and cancellation of transmission connection, playing a great role in ensuring communication service quality, and when the sensor network needs to provide data for other external networks, the transport layer is responsible for converting a network internal addressing mode into an IP address addressing mode.
(5) The application layer comprises application layer software oriented to users, wherein task distribution and data broadcast management protocols, sensor query protocols and the like are key points of the layer which needs to be designed, main services of the layer comprise positioning and time synchronization, the layer needs to cooperate with a data transmission link for positioning and synchronization, other layers need to be provided with necessary support, and design examples comprise a MAC protocol based on TDMA, a routing protocol based on object position and the like.
Example 4
The wireless sensor node comprises two energy consumption modes of data transmission and data fusion, and the energy consumption for data transmission is higher than that for data fusion;
in this embodiment, the method of fusing data by using cluster head nodes and then sending the fused data to the network manager is superior to the method of directly sending data to the network manager by using each sensor node.
According to the radio energy consumption model, a message of one bit is transmitted, and the energy consumption formula of the energy supply module is as follows:
wherein the content of the first and second substances,
in formula (1), x is the number of bytes of the transmitted data packet, b is the transmission distance, and when the transmission distance b is less than the threshold b 0 In time, the transmit power is in free space mode, otherwise, in multipath fading mode, W elec (nJ/bit) is the radio frequency energy consumption coefficient; epsilon fs And ε mp The power consumption coefficients of the circuit amplifier under the two modes are respectively.
According to the node degree and the distance between the node degree and the regional center, the overlapping coverage area between the clusters is reduced as much as possible, and the cluster heads are replaced in a rotating mode, so that the energy consumption of the sensor nodes on the energy supply module is reduced, and the network life cycle of the wireless sensor is prolonged.
The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. The procedures or functions according to the embodiments of the present application are generated in whole or in part when a computer instruction or a computer program is loaded or executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device, such as a server, data center, etc., that contains one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In addition, the "/" in this document generally indicates that the former and latter associated objects are in an "or" relationship, but may also indicate an "and/or" relationship, which may be understood with particular reference to the former and latter text.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A big data transmission method of a wireless sensor network is characterized in that: the transmission method comprises the following steps:
s1: after the wireless sensor nodes collect data, request frames are sent to a network manager through a node network, and the network manager carries out time sequence compensation on network beacons of all nodes;
s2: the network manager receives the request frame and allocates a network channel to the wireless sensor in a multi-hop transmission mode;
s3: the network manager schedules network data for parallel transmission in a parent-child link time sequence rotation mode, so that a root node is always in a receiving state in a data transmission stage;
s4: the receiving node of the network manager sends a reply frame back to the received data packet.
2. The big data transmission method of the wireless sensor network according to claim 1, wherein: in the multi-hop transmission mode, a routing node establishes a transmission link to forward data between a child node and a father node, and the step of establishing the transmission link is as follows: and the whole network node is kept in a clock synchronization state by adopting a channel switching strategy of clock synchronization transmission, and when the channel is switched, the routing node and the father node and the son node predetermine link switching time in advance.
3. The big data transmission method of the wireless sensor network according to claim 1, wherein: the scheduling method of the parent-child link time sequence rotation comprises the following steps:
s3.1: transmitting and transmitting states of each node are staggered;
s3.2: the network routing node sends data to a father node when a subordinate child routing node of the network routing node is in a data receiving state, and meanwhile, the network routing node receives the data in time when the child routing node of the network routing node needs to send the data.
4. The big data transmission method of the wireless sensor network according to claim 1, wherein: the wireless sensor network comprises a network manager, a repeater and sensor nodes, wherein the network manager is used for maintaining and managing the network, the repeater is used for wireless communication transmission of data, and the sensor nodes are terminal equipment and used for executing data acquisition, monitoring, detection and control operation.
5. The big data transmission method of the wireless sensor network according to claim 4, wherein: the data transmission of the wireless sensor network comprises the following steps:
s1.1: when the sensor node sends big data, sending a long-time slot occupation request frame;
s1.2: after receiving the long time slot occupation request frame, the network manager allocates the long time slot occupied by the sensor node to the sensor node occupation and sends a long time slot configuration communication frame;
s1.3: the sensor node receives the long time slot configuration communication frame, enters a data transmission mode to send big data when entering the long time slot occupied by the sensor node, and enters a sleep mode when leaving the long time slot occupied by the sensor node;
s1.4: the network manager receives large data in a long time slot occupied by the sensor node.
6. The big data transmission method of the wireless sensor network according to claim 5, wherein: the wireless sensor node comprises a data acquisition module, a data processing module, a wireless communication module and an energy supply module, wherein the data acquisition module is used for acquiring and converting data, the data processing module is used for processing and storing the data, the wireless communication module is used for exchanging data information and control information with the node, and the energy supply module is used for supplying energy for the work of each part of the node.
7. The big data transmission method of the wireless sensor network according to claim 6, wherein: the data acquisition module comprises a sensitive element module and an AD/DC converter, the sensitive element module acquires data, and the AD/DC converter converts the data into analog quantity and digital quantity;
the data processing module comprises a microprocessor module and a memory module, the microprocessor module processes data, and the memory module stores the processed data;
the wireless communication module comprises a wireless transceiver, an MAC module and a network module, and the wireless transceiver, the MAC module and the network module are electrically connected;
the energy supply module is a micro storage battery which is used for supplying power.
8. The big data transmission method of the wireless sensor network according to claim 7, wherein: the wireless sensor network protocol stack comprises a physical layer, a data link layer, a network layer, a transmission layer and an application layer;
the physical layer is used for sampling and quantizing data information, modulating signals and transmitting and receiving data;
the network layer is used for selecting a transmission path and maintaining and updating the transmission path;
the transport layer is used to control the transmission of data streams and manage the establishment, maintenance and cancellation of transport connections.
9. The big data transmission method of the wireless sensor network, according to claim 6, wherein: the energy consumption formula of the energy supply module is as follows:
wherein the content of the first and second substances,
in formula (1), x is the number of bytes of the transmitted data packet, b is the transmission distance, and when the transmission distance b is less than the threshold b 0 In time, the transmit power is in free space mode, otherwise, in multipath fading mode, W elec (nJ/bit) is the radio frequency energy consumption coefficient; epsilon fs And ε mp The power consumption coefficient of the circuit amplifier under the two modes is respectively.
10. The big data transmission method of the wireless sensor network according to any one of claims 1 to 9, wherein: when the wireless sensor network data is transmitted, the receiving party returns a response frame containing a corresponding packet sequence number for each received data frame, and the transmitting party does not receive the response frame of the transmitted data frame within the specified time length, considers that the transmission of the corresponding data frame fails, and retransmits the data frame.
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