CN101860908A - Seamless and efficient communication mechanism between wireless multimedia sensor network nodes - Google Patents

Seamless and efficient communication mechanism between wireless multimedia sensor network nodes Download PDF

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CN101860908A
CN101860908A CN201010155848A CN201010155848A CN101860908A CN 101860908 A CN101860908 A CN 101860908A CN 201010155848 A CN201010155848 A CN 201010155848A CN 201010155848 A CN201010155848 A CN 201010155848A CN 101860908 A CN101860908 A CN 101860908A
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node
packet
data
sensor
frame
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CN101860908B (en
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王汝传
陈庭德
黄海平
孙力娟
沙超
肖甫
叶宁
凡高娟
黄小桑
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a seamless and efficient communication method between wireless multimedia sensor network nodes, and relates to the solution for the communication between two nodes with different functions in a wireless multimedia sensor network. In the method, sensor nodes consist of five main modules, namely a processor module, a wireless multimedia sensor network Zigbee communication module, a sensor module, a memory module and a power supply module, wherein the sensor nodes are disposed in a certain monitoring area; data transmitted from a last node is received and forwarded by using a Zigbee wireless communication module; protocol conversion does not need to be performed between a multimedia sensor node and a common sensor node; and the data is transmitted back to a management centre by using the Internet. The communication mechanism realizes the seamless and efficient communication between the multimedia sensor node and the common sensor node without performing the conversion between a multimedia sensor network communication protocol and a common sensor network communication protocol.

Description

The communication mechanism of seamless and efficient between a kind of wireless multimedia sensor network node
Technical field
The present invention relates in the wireless multimedia sensor network solution of communicating by letter between the different node of two kinds of functions, belong to the crossing domain of embedded development and computer networking technology.
Background technology
Along with the development of microelectric technique and reaching its maturity of wireless sensor network, monitoring of environmental increasingly sophisticated changeable, the simple data of being obtained by the traditional sensors network can not satisfy the comprehensive demand of people to environmental monitoring further, press for medium such as amount of information abundant image, audio frequency, video are incorporated into environmental monitoring activity based on sensor network, realize fine granularity, the precisely environmental monitoring of information.The wireless multimedia sensor that grows up the on this basis world that steps into us gradually, it is the improvement to conventional wireless sensor, such as having increased the CMOS camera, elements such as sound collector are to realize perception and the transfer function to image, audio frequency, video data.A large amount of wireless multimedia sensors is placed on the zone of appointment, forms the network system of the self-organizing of a multi-hop, we be called wireless multimedia sensor network (Wireless MultimediaSensor Networks, WMSNs).It is by means of the multiple media information (audio frequency, video, image, numerical value etc.) of multi-media sensor perception place surrounding enviroment on the node, by the multi-hop relay mode data are passed to information and converge the center, the center of converging is analyzed Monitoring Data, realizes comprehensively and the environmental monitoring of imitating.
Multimedia sensor node is a base unit of forming wireless multimedia sensor network, and these nodes generally have following characteristics: the one, and energy is seriously limited; The 2nd, disposal ability is generally not strong; The 3rd, storage capacity is limited.These characteristics of multimedia sensor network node have also limited its further development to a certain extent.Two kinds of nodes that function is different are arranged in the wireless multimedia sensor network: a kind of is general sensor nodes, is responsible for small data quantity data such as collecting temperature, humidity; A kind of is multimedia sensor node, is responsible for gathering big data quantity data such as audio frequency, image and video.Current wireless multimedia sensor network can only be realized the internodal efficient communication of same type of sensor, also can't realize the efficient communication between multimedia sensor node and general sensor nodes.Certainly, present someone has proposed the communication solution under some multimedia sensor nodes and the general sensor nodes coexistence, mainly contain following three kinds: (1) is at the same area, dispose multimedia sensor node with the general sensor nodes equal densities, two kinds of nodes only communicate with similar, do not communicate by letter mutually; (2) on same node, integrated multimedia sensor assembly and common sensor assembly use different communication protocol for common sensing data with the multimedia sensing data simultaneously; (3) allow multimedia sensor node and general sensor nodes to communicate, but multimedia sensor node can only use the communication protocol of common transducer and general sensor nodes to communicate.
The inventor finds in research process, these three kinds of schemes all exist different defectives: first kind of scheme, this deployment scheme causes in same monitoring place two sensor nodes being arranged on average, and can not communicate by letter between two kinds of sensor nodes, administrative center will obtain the sensing data in a certain place, need to send two subcommands, and two sensor nodes are sent back to administrative center with sensing data, each need carry out route and transfer of data, though this scheme can comprehensively be monitored surveyed area, its shortcoming is the resource of too much wasting wireless multimedia sensor network, and can roll up cost.Second kind of scheme, only need a sensor node in same detection site, two subcommands and twice route and the transfer of data of first kind of scheme have been solved, certain Internet resources have been saved, reduced the node number, but its shortcoming is while integrated multimedia transducer and a common transducer on same node, has increased the individual node cost, thereby increased the whole cost of on-premise network, can cause certain waste of network resources simultaneously.The third scheme, the function of sensor node that this scheme is clear and definite has solved the too high problem of individual node cost in second kind of scheme.Its shortcoming is because the multimedia sensing data volume is excessive, uses common sensor network protocol transmitting multimedia data, the energy resource of consuming sensor node that can be too fast, and energy resource the most valuable resource in the sensor network exactly.
Summary of the invention
Technical problem: the objective of the invention is at deficiency of the prior art, the communication mechanism of seamless and efficient between a kind of wireless multimedia sensor network node is proposed, and at the communication mechanism of having realized seamless and efficient between a kind of wireless multimedia sensor network node on the sensor node of this modularized design, this communication mechanism has been realized the communicating by letter of seamless and efficient between multimedia sensor node and general sensor nodes, and need not to carry out the conversion of multimedia sensor network communication protocol and common sensor network communication agreement, administrative center makes when will obtain the sensing data of a certain detection site, only need to send a subcommand and carry out route and transfer of data, and the multi-medium data that can effectively reduce big data quantity is in the internodal propagation delay time of multi-hop.
Technical scheme: the present invention has designed a kind of modular wireless multimedia sensor network node, allow multimedia sensor node and general sensor nodes use with a kind of communication module, make two kinds of sensor nodes have bigger effective communication distance and traffic rate, use a kind of communication protocol can realize two kinds of internodal mutual communication, and can satisfy the big requirement of multimedia sensing data volume.Use is with a kind of communication protocol, and communicating by letter between wireless multimedia sensor node and the general sensor nodes just becomes more convenient and smooth and easy, and the scope of application of wireless multimedia sensor network further enlarges, and practicality also is further enhanced.
Device of the present invention is multimedia sensor node and the general sensor nodes with same communication module: multimedia sensor node is as data source nodes the time, the multimedia sensing data volume of gathering is big, the amount of capacity of the memory module that needs is wanted to satisfy actual application demand, select big some memories of capacity; As transit node the time, the sure requirement of satisfying big data quantity multi-medium data frame storage forwarding of jumbo memory.General sensor nodes is as data source nodes the time, the common sensing data amount of gathering is less, but as transit node the time, store the multi-medium data frame of transmitting big data quantity, so the memory module amount of capacity of selecting will satisfy the requirement that storage is transmitted.Sensor node is according to different application demands, integrated different sensor assembly.For realizing the communication of seamless and efficient between node, on whole sensor nodes, all use with a kind of in-plant wireless communication chips, when between different types of sensor node, communicating by letter, only need a kind of communication protocol just can realize, do not need to carry out protocol conversion, but this wireless communication chips to satisfy the big requirement of multi-medium data data volume.To the selection of the processor of sensor node, require to drive communication module, so multimedia sensor node and general sensor nodes should be used same model processor, and to be able to handle the multi-medium data of big data quantity.Because all nodes have all adopted with a kind of communication module, use is with a kind of communication protocol, when administrative center goes for the sensing data in a certain monitoring place, only need to send a subcommand, sensing data only needs route and transfer of data just can arrive administrative center.Certainly, also can set higher forwarding priority for some significant datas.
This method based on sensor node constitute by five main modular: processor module, wireless multimedia sensor network ZigBee communication module, sensor assembly, memory module and supply module; Sensor node deployment is in a certain monitored area, receive and transmit the data of sending by the ZigBee wireless communication module by a last hop node, need not to carry out the conversion of agreement between multimedia sensor node and general sensor nodes, at last by the internet with data back administrative center;
The communication means of seamless and efficient is as follows between this wireless multimedia sensor network node:
Data source nodes is selected by step 1) administrative center: administrative center selects near the monitoring place that will check sensor node as this data source nodes in the zone that wireless multimedia sensor network covers according to monitoring requirements,
Step 2) route is calculated by administrative center: administrative center is behind selected this data monitored source node, calculate administrative center and arrive the route lines of the optimal path of data source nodes as this data transfer, be made as R { administrative center, gateway node, aggregation node, forward node n-1, ..., forward node 2, forward node 1, data source nodes }
Step 3) administrative center sends order: administrative center is sent to data source nodes according to the route lines of this calculating with the data request command frame, and in order, carry this routing iinformation, behind each node on this route lines data request command frame that a hop node sends on receiving, sending the order acknowledgement frame confirms it
The step 4) data source nodes is divided into groups to data: data source nodes is after receiving the data request command frame that carries routing iinformation that administrative center sends, this sensing data that need send is divided into groups, each grouping comprises a plurality of wireless multimedia sensor network data frames, the characteristics big according to the wireless multimedia sensor network data amount, the packet acknowledgement pattern will reduce the frame flow in the wireless multimedia sensor network in a large number, transmission time than common single frames affirmation mode is wanted much less, reduced a large amount of energy consumptions, thereby effectively improve the life cycle of wireless multimedia sensor node
Step 5) sends packet 1: establishing this packet that need send is: packet 1, and packet 2 ..., packet M; Data source nodes is after finishing the grouping that sends data, enter sending mode, according to routing iinformation, Frame in the packet 1 is sent to continuously its next-hop node transit node 1, after sending packet 1, enter receiving mode, wait for receiving the acknowledgement frame that transit node 1 sends packet 1
Step 6) is transmitted packet 1: transit node 1 is after the packet 1 of receiving the data source nodes transmission, enter sending mode, send the last hop node data source nodes of the acknowledgement frame of packet 1 earlier to it, then packet 1 is sent to its next-hop node transit node 2, after being sent completely, enter receiving mode, wait for receiving the acknowledgement frame that transit node 2 sends packet 1
Step 7) sends all data packets: data source nodes is behind the acknowledgement frame of the packet 1 that receives transit node 1 transmission, wait for that certain hour at interval, send packet 2, wait for the acknowledgement frame of packet 2, be sent completely up to all data packets, after receiving the acknowledgement frame of packet M, enter sleep pattern
Step 8) is transmitted all data packets: transit node 1 is behind the acknowledgement frame of the packet 1 of receiving transit node 2, receive the Frame of the packet 2 of data source nodes transmission, after receiving the Frame of packet 2, enter sending mode, send the acknowledgement frame of packet 2 earlier to data source nodes, send packet 2 to transit node 2 then; Wait for the acknowledgement frame of the packet 2 that transit node 2 sends, after all data packets forwarding is finished, received the acknowledgement frame of packet M, enter sleep pattern,
The step 9) all data packets arrives gateway node: packet is by after the forwarding of transit node, the final gateway node that all arrives, transit node is behind the acknowledgement frame of receiving packet M, enter sleep pattern, gateway node is being received all data packets, and send the acknowledgement frame of a data grouping M to aggregation node after, with all data packets by protocol conversion, be converted to and be sent to administrative center by the data frame format of Internet transmission by Internet
The step 10) all data packets arrives administrative center, after confirming, and this sign off.
Beneficial effect: the present invention has compared following several advantage with more existing multimedia sensor nodes with the communication solution under the general sensor nodes coexistence:
(1) saves cost: only need to use the transfer problem that has just solved communication protocol between multimedia sensor node and general sensor nodes with a kind of communication module.Solve the communication issue between multimedia sensor node and common transducer, key is exactly to solve the communication protocol problem.If do not communicate between multimedia sensor node and the general sensor nodes, then to realize a certain zone is effectively detected, need be deployed in this zone with two kinds of sensor nodes with identical density, do so obviously to roll up cost.Therefore we adopt the uniform communication chip to multimedia sensor node and general sensor nodes, need not to carry out the communication that protocol conversion just can realize seamless and efficient between the wireless multimedia sensor network node.
(2) make the application of wireless multimedia sensor network more convenient, enlarge range of application: current, the wireless multimedia sensor network application prospect is huge, realization of the present invention, make and use a kind of communication protocol, just can realize communicating by letter between multimedia sensor node and the general sensor nodes easily, the practicality of wireless multimedia sensor network is had greatly improved, enlarge the range of application of wireless multimedia sensor network greatly.
(3) wireless multimedia sensor network data is classified, different types of data is carried out different forward modes, to the multi-medium data of big data quantity, can effectively reduce network transfer delay especially.Memory module is divided into two memory cell: acquired data storage unit, forwarding data storage cell.The sensing data of this node collection is put into the acquired data storage unit, the data that receive are put into the forwarding data storage cell.Simply transmit for common sensing data and to get final product, carry out communication mechanism efficiently for the multimedia sensing data.
Description of drawings
Fig. 1 is a wireless multimedia sensor network data transmission course schematic diagram;
Fig. 2 is the modular construction figure of multimedia sensor node of the present invention;
Fig. 3 is the modular construction figure of general sensor nodes of the present invention;
Fig. 4 is a seamless and efficient communication mechanism schematic diagram of the present invention.
Embodiment
The present invention is a kind of modularized design of wireless multimedia sensor network node.This sensor node is made of five main modular: processor module, wireless multimedia sensor network ZigBee communication module, sensor assembly, memory module and supply module.Sensor node generally is deployed in a certain monitored area, receive and transmit the data of sending by the ZigBee wireless communication module by a last hop node, need not to carry out the conversion of agreement between multimedia sensor node and general sensor nodes, at last by the internet with data back administrative center.
The present invention adopts the method for software-hardware synergism design, and promptly in hardware designs, the relevant simulation software of utilization carries out commissioning test to subprogram, so just can shorten the construction cycle.Below in conjunction with accompanying drawing the present invention is described in detail.Should be clear and definite, following content only is used for describing the present invention and not as limitation of the present invention.
The specific design method and the development procedure of the communication mechanism of sensor node and seamless and efficient thereof are:
1) on the basis that the architecture and the data transfer mode of wireless multimedia sensor network node are furtherd investigate, clear and definite wireless multimedia sensor network subject matter to be solved, the i.e. communication issue of multimedia sensor node and general sensor nodes.Thereby determine the major function of sensor node, reduce some unnecessary functions, to optimize joint behavior.The major function of sensor node is image data and transmits data.Therefore, decide certain sensor node to use multi-media sensor module or common sensor assembly according to different application demands.Sensor node also requires to have high system reliability and high integration, real-time analysis preferably and disposal ability, transfer of data accuracy simultaneously.
2) the basic architecture design of node.The basic boom of sensor node has been followed the fundamental mode of general embedded product, simultaneously, based on the needs of practical application, all expansions to some extent on each aspect.Be divided into three layers generally, bottom-uply be: hardware platform layer, embedded system kernel and application layer.
(1) hardware platform layer.Hardware platform is the underlying platform and the hardware foundation of whole node.Comprised the set that all hardware modules of node are formed and system bottom calls.Each composition module of node is carried out comprehensive and co-ordination.Simultaneously, defined the bus unit of node, interrupt system and mode of operation etc.
(2) embedded system kernel.The embedded system kernel is operated between bottom hardware platform and the upper level applications, finish the driving of each hardware device, the methods that provide software and hardware system to call for the application layer exploitation provides interface service, make the exploitation of upper level applications can shield the bottom hardware platform fully simultaneously.System kernel at the special requirement of sensor node, has improved the interruption controls strategy, process scheduling strategy and memory management policy simultaneously based on the management and dispatching strategy of real time operating system.
(3) application layer.Application system level provides application oriented system control mode and method of work for the user.The user can be according to different separately application demands, and the exploitation different application is finished a series of application functions such as startup, operation, state transition, information processing, signal transmission, energy consumption early warning and program download of node.
3) node module is divided.According to the functional requirement of sensor node, can the Module Division of sensor node is as follows.Multimedia sensor node mainly is made up of five modules: processor module, wireless multimedia sensor network ZigBee communication module, multi-media sensor module, memory module and supply module, the annexation of each intermodule as shown in Figure 2.General sensor nodes mainly is made up of five modules: processor module, wireless multimedia sensor network ZigBee communication module, common sensor assembly, memory module and supply module, the annexation of each intermodule as shown in Figure 3.
4) processor module design.At first will select suitable processor, sensor node will be finished data acquisition and data forwarding function, therefore can select 8 more cheap bit processors of price for use.
Sensor node processes device module mainly connects close range wireless communication module, sensor assembly and memory module, can select for use a SPI interface to connect close range wireless communication module, sensor interface connects sensor assembly, serial line interface connected storage module; The pin that other of gateway node is not used to all can be drawn, to be used for the function expansion of later stage continuity product.
5) communication module design.The close range wireless communication module of wireless multimedia sensor network comprises low noise amplifier, ADC, DAC, power amplifier, control logic, frequency mixer, filter circuit, frequency divider, digital modems, phase discriminator, low pass filter, antenna etc., between communication chip and antenna, add a power amplifier, improve communication quality with this.
6) memory module design.Wireless multimedia sensor network wants data quantity transmitted big, so a memory module will be set on sensor node.Wireless multimedia sensor node has two kinds, and a kind of is general sensor nodes, is responsible for the less common sensing data of image data amount, as temperature, humidity etc.; A kind of is multi-media nodes, is responsible for the big multi-media sensor data of image data amount, as image, audio frequency etc., so memory module is divided into two parts: acquired data storage unit, forwarding data storage cell.Two memories are arranged: internal memory and NAND Flash on the sensor node.Wherein internal memory 4K byte is used for doing significant data and transmits memory cell, satisfies the real-time requirement of data.The NANDFlash of integrated 16M byte on multimedia sensor node is divided into the multimedia collection data storage cell of two part: 14M and the forwarding data storage cell of 2M; The NAND Flash of integrated 4M byte on general sensor nodes is divided into the common acquired data storage unit of two part: 2M and the forwarding data storage cell of 2M.2M is used for doing the forwarding data storage cell, can satisfy the requirement of the multi-medium data storage forwarding of big data quantity to memory capacity.
7) supply module design.Supply module provides the energy for above-mentioned each module, at four kinds of different mode of operations such as the sleep pattern of node, sending mode, receiving mode, battery saving modes, provides corresponding energy resource supply mode.
8) data transmit-receive Design Pattern.For saving limited energy resource, node is in sleep pattern in the most of the time.Behind the data request command that receives administrative center's transmission, data source nodes enters sending mode, according to the routing iinformation that carries in the command frame, Frame is sent to next-hop node on the route lines, next-hop node enters receiving mode, and deposit the Frame that receives in the forwarding data storage cell, next-hop node is after receiving this Frame, enter sending mode, the Frame that receives is sent to its next-hop node according to the routing iinformation that carries in the command frame, till Frame is passed administrative center back.After being sent completely, node enters sleep pattern.Fig. 4 has described the main process of the communication mechanism of seamless and efficient between the wireless multimedia sensor network node.Its concrete steps are as follows:
Data source nodes is selected by step 1) administrative center
Administrative center selects near the monitoring place that will check sensor node as this data source nodes in the zone that this wireless multimedia sensor network covers according to monitoring requirements.
Step 2) route is calculated by administrative center
Administrative center calculates administrative center and arrives the route lines of the optimal path of data source nodes as this data transfer behind selected this data monitored source node.Be made as R{ administrative center, gateway node, aggregation node, forward node n-1 ..., forward node 2, forward node 1, data source nodes }.
Step 3) administrative center sends order
Administrative center is sent to data source nodes according to the route lines of this calculating with the data request command frame.And in order, carry this routing iinformation.Behind each node on this route lines data request command frame that a hop node sends on receiving, send the order acknowledgement frame it is confirmed.
The step 4) data source nodes is divided into groups to data
Data source nodes is divided into groups to this sensing data that need send after receiving the data request command frame that carries routing iinformation that administrative center sends, and each grouping comprises a plurality of wireless multimedia sensor network data frames.The characteristics big according to the wireless multimedia sensor network data amount, the packet acknowledgement pattern of this paper design will reduce the frame flow in the wireless multimedia sensor network in a large number, transmission time than common single frames affirmation mode is wanted much less, reduced a large amount of energy consumptions, thereby effectively improved the life cycle of wireless multimedia sensor node.
Step 5) sends packet 1
If this packet that need send is: packet 1, packet 2 ..., packet M.Data source nodes is after finishing the grouping that sends data, enter sending mode, according to routing iinformation, Frame in the packet 1 is sent to continuously its next-hop node transit node 1, after sending packet 1, enter receiving mode, wait for receiving the acknowledgement frame that transit node 1 sends packet 1.
Step 6) is transmitted packet 1
Transit node 1 is after the packet 1 of receiving the data source nodes transmission, enter sending mode, send the last hop node data source nodes of the acknowledgement frame of packet 1 earlier to it, then packet 1 is sent to its next-hop node transit node 2, after being sent completely, enter receiving mode, wait for receiving the acknowledgement frame that transit node 2 sends packet 1.
Step 7) sends all data packets
Data source nodes waits for that certain hour at interval, sends packet 2 behind the acknowledgement frame of the packet 1 that receives transit node 1 transmission, wait for the acknowledgement frame of packet 2.Be sent completely up to all data packets, receive the acknowledgement frame of packet M after, enter sleep pattern.
Step 8) is transmitted all data packets
Transit node 1 is behind the acknowledgement frame of the packet 1 of receiving transit node 2, receive the Frame of the packet 2 of data source nodes transmission, after receiving the Frame of packet 2, enter sending mode, send the acknowledgement frame of packet 2 earlier to data source nodes, send packet 2 to transit node 2 then.Wait for the acknowledgement frame of the packet 2 that transit node 2 sends.After all data packets forwarding is finished, received the acknowledgement frame of packet M, enter sleep pattern.
The step 9) all data packets arrives gateway node
Packet finally all arrives gateway nodes by after the forwarding of transit node.Transit node enters sleep pattern behind the acknowledgement frame of receiving packet M.Gateway node is being received all data packets, and send the acknowledgement frame of a data grouping M to aggregation node after.All data packets by protocol conversion, is converted to and can be sent to administrative center by Internet by the data frame format of Internet transmission.
The step 10) all data packets arrives administrative center, after confirming, and this sign off.
9) other peripheral components of node is chosen.Because be subjected to the constraint of node volume, other peripheral components is chosen the little encapsulation of trying one's best (generally being the SMD encapsulation of 0603 type).To give the design of node jtag interface simultaneously, in order to burning program and in-circuit emulation.Other device also comprises: external memory device, external crystal-controlled oscillation, omnidirectional antenna etc.
10) node power consumption management design.We can record by experiment, the wireless communication module of wireless multimedia sensor network node is the module of power consumption maximum in all modules of whole node, and one of major function of sensor node is exactly to carry out wireless receiving and transmission, and therefore being necessary for sensor node designs effective power managed mechanism.Power managed of the present invention has mainly comprised the system level power consumption management, and the software code level is optimized, and register transfer optimization and rear end comprehensive wiring are optimized.The system level power consumption management will make it to enter sleep state when node is not operated, when Preset Time arrives, produce and interrupt waking up; The software code level is optimized, and promptly node has adopted good coding style, reduces redundancy encoding, and the code after the optimization has been saved the CPU processing time, and power consumption is greatly reduced; Aspect register transfer, the present invention has adopted hardware configuration optimization and the parallel optimisation strategy of system's pipeline processes, reduce the on-chip memory Module Division of register electric capacity simultaneously, reduce the signal gate of activity factor, reduce the propagation velocity of burr etc., the register transfer power consumption is greatly reduced with this; Aspect the comprehensive wiring of rear end, the present invention has adopted the optimization circuit, reduces operation, revises modes such as signal correction relation, has further reduced the generation probability of comprehensive burr.
11) node extensibility design.Along with integrated circuit and development of Embedded technique, the present invention also will constantly improve and be perfect.Therefore, in the design of node process, reserved sufficient interface, comprised surpassing a plurality of main control module input/output interfaces, so that the continuity exploitation of subsequent product is convenient in calling and expand from now on.
12) node anti-interference design.Because sensor node has the high-frequency wireless communication module, and the node volume is less, it is closeer to connect up, and therefore the Anti-interference Design of node is had relatively high expectations.The present invention loads filter capacitor in the high-frequency wireless communication partial design of node, on IC and connect high frequency capacitance, adopts intensive wiring to reduce the high-frequency noise emission; Aspect the propagation path inhibition, design of node goes out to have the stabilized power supply of filter circuit, is isolated between I/O mouth and noise source, simultaneously, interference source is separated with Sensitive Apparatus.
13) node system software design.The harmonious operation of all real-time tasks of the system software controls of node, system carries out resource management according to mission requirements, and Message Processing, task scheduling, abnormality processing, and distribute priority, system be according to the priority of each task, dynamically switches and dispatch.
14) software reliability design.Software reliability design among the present invention has mainly comprised Anti-interference Design and fault-tolerant design.Design of Software Anti-interference is the householder method of hardware anti-interference design.Among the present invention, adopt digital filtering that suppresses superposition noise on signal path and the method that reduces redundant instruction, adopt reduced instruction set.When hardware was out of order, the rapid perception of software energy was also taked corresponding remedial measure.To some significant datas, can adopt the ciphertext form to send.

Claims (1)

1. the communication means of seamless and efficient between a wireless multimedia sensor network node, it is characterized in that this method based on sensor node constitute by five main modular: processor module, wireless multimedia sensor network ZigBee communication module, sensor assembly, memory module and supply module; Sensor node deployment is in a certain monitored area, receive and transmit the data of sending by the ZigBee wireless communication module by a last hop node, need not to carry out the conversion of agreement between multimedia sensor node and general sensor nodes, at last by the internet with data back administrative center;
The communication means of seamless and efficient is as follows between this wireless multimedia sensor network node:
Data source nodes is selected by step 1) administrative center: administrative center selects near the monitoring place that will check sensor node as this data source nodes in the zone that wireless multimedia sensor network covers according to monitoring requirements,
Step 2) route is calculated by administrative center: administrative center is behind selected this data monitored source node, calculate administrative center and arrive the route lines of the optimal path of data source nodes as this data transfer, be made as R{ administrative center, gateway node, aggregation node, forward node n-1, ..., forward node 2, forward node 1, data source nodes }
Step 3) administrative center sends order: administrative center is sent to data source nodes according to the route lines of this calculating with the data request command frame, and in order, carry this routing iinformation, behind each node on this route lines data request command frame that a hop node sends on receiving, sending the order acknowledgement frame confirms it
The step 4) data source nodes is divided into groups to data: data source nodes is after receiving the data request command frame that carries routing iinformation that administrative center sends, this sensing data that need send is divided into groups, each grouping comprises a plurality of wireless multimedia sensor network data frames, the characteristics big according to the wireless multimedia sensor network data amount, the packet acknowledgement pattern will reduce the frame flow in the wireless multimedia sensor network in a large number, transmission time than common single frames affirmation mode is wanted much less, reduced a large amount of energy consumptions, thereby effectively improve the life cycle of wireless multimedia sensor node
Step 5) sends packet 1: establishing this packet that need send is: packet 1, and packet 2 ..., packet M; Data source nodes is after finishing the grouping that sends data, enter sending mode, according to routing iinformation, Frame in the packet 1 is sent to continuously its next-hop node transit node 1, after sending packet 1, enter receiving mode, wait for receiving the acknowledgement frame that transit node 1 sends packet 1
Step 6) is transmitted packet 1: transit node 1 is after the packet 1 of receiving the data source nodes transmission, enter sending mode, send the last hop node data source nodes of the acknowledgement frame of packet 1 earlier to it, then packet 1 is sent to its next-hop node transit node 2, after being sent completely, enter receiving mode, wait for receiving the acknowledgement frame that transit node 2 sends packet 1
Step 7) sends all data packets: data source nodes is behind the acknowledgement frame of the packet 1 that receives transit node 1 transmission, wait for that certain hour at interval, send packet 2, wait for the acknowledgement frame of packet 2, be sent completely up to all data packets, after receiving the acknowledgement frame of packet M, enter sleep pattern
Step 8) is transmitted all data packets: transit node 1 is behind the acknowledgement frame of the packet 1 of receiving transit node 2, receive the Frame of the packet 2 of data source nodes transmission, after receiving the Frame of packet 2, enter sending mode, send the acknowledgement frame of packet 2 earlier to data source nodes, send packet 2 to transit node 2 then; Wait for the acknowledgement frame of the packet 2 that transit node 2 sends, after all data packets forwarding is finished, received the acknowledgement frame of packet M, enter sleep pattern,
The step 9) all data packets arrives gateway node: packet is by after the forwarding of transit node, the final gateway node that all arrives, transit node is behind the acknowledgement frame of receiving packet M, enter sleep pattern, gateway node is being received all data packets, and send the acknowledgement frame of a data grouping M to aggregation node after, with all data packets by protocol conversion, be converted to and be sent to administrative center by the data frame format of Internet transmission by Internet
The step 10) all data packets arrives administrative center, after confirming, and this sign off.
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CN102196041A (en) * 2011-04-28 2011-09-21 华南理工大学 Wireless intelligent transducer and method for implementing plug and play of transducer
CN102325344A (en) * 2011-06-13 2012-01-18 南京邮电大学 Method for tracking and locating container by adopting label sensor network
CN102325344B (en) * 2011-06-13 2014-09-10 南京邮电大学 Method for tracking and locating container by adopting label sensor network
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CN102378133A (en) * 2011-12-02 2012-03-14 中国科学院上海微系统与信息技术研究所 System and method for processing multimedia information of sensor network based on OMAP (Open Multimedia Application Platform)
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CN104731757A (en) * 2013-12-20 2015-06-24 国际商业机器公司 System and method for determining command rate based on dropped commands
CN104731757B (en) * 2013-12-20 2017-09-29 国际商业机器公司 System and method for determining commanded rate based on delete command
CN104318740A (en) * 2014-10-15 2015-01-28 南京邮电大学 Universal sensor transceiving method based on Zigbee and serial port
CN104318740B (en) * 2014-10-15 2017-08-25 南京邮电大学 General purpose transducer receiving/transmission method based on Zigbee and serial ports

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