CN105992315A - Wireless low-power sensor network based on low-duty-cycle working mode - Google Patents
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Abstract
The invention puts forward a low-power wireless sensor network networking and transmission technology based on fixed network nodes and an intermittent low-duty-cycle working mode in view of the defects of the existing wireless sensor network. On the premise of low power, information relay and transmission between networking nodes is realized. Therefore, problems such as remote automatic centralized reading of water, electricity and gas meters and low-power remote data acquisition of wild battery-powered sensors are solved.
Description
Technical field
The present invention relates to active RFID, wireless sense network and low-consumption wireless constructing communication network technology.
Background technology
Existing wireless sense network mainly includes the mesh network (mesh-net) with Zigbee as representative and the radial network (star-net) two kinds with active RFID as representative.Mesh network with Zigbee as representative, it is that the state that Radio Transmission Node based on all participation networkings is in continuous non-stop run gets off to realize, ZigBee also contemplates the dynamic change of system group network node, thus have employed the mode of dynamic group net and dynamic routing, this mode must waste substantial amounts of Internet resources, affects the work efficiency of network.While it appear that the power consumption of each Zigbee node only tens milliamperes, but owing to being in continuous duty, general battery all can only support the very limited amount of time, so that outer power supply source；In actual applications, owing to working sensor node often immobilizes, receive and the node of transmitting signal is the clearest and the most definite, it is not required to dynamic group net and dynamic road, thus, can play Zigbee dynamic group net, the place of dynamic routing advantage is very limited, thus this function often becomes the burden of network.General active RFID low-power consumption low duty ratio working method despite the use of, but group-net communication between each label, can not be realized.Along with pushing ahead of Internet of Things information revolution, more and more urgent to the needs of wireless senser information gathering, this is just badly in need of the low-consumption wireless Sensor Network of a kind of simple non-dynamic change, realizes the low-power consumption collection transmission of sensor information.
Summary of the invention
The present invention is aiming at the defect of existing wireless sense network, it is proposed that a kind of based on the sensor network technology under fixing network node and low duty ratio working method pattern, thus achieves the information transmission between networking node on the premise of low-power consumption.
The all-network node participating in networking in the present invention has fixing installation site；The wireless transmit/receive units that each node is made up of at least one transceiver and single-chip microcomputer is constituted.Each node can be connected with sensor or miscellaneous equipment, they can realize radio communication to each other, transceiver in each Transmit-Receive Unit uses periodic sleep usually, after reviving on preassigned channel the working method of the flashy low duty ratio of monitoring signal, this flashy listening period is the shortest, but be enough to the radio frequency features by received signal, including frequency, modulation system, coded systems etc. determine whether to listen to there is the signal that can realize radio communication therewith, such as can represent one or two " 0 " in digital communication or " 1 " bit signal.Only when listening to this signal, the transceiver in node just can extend listening period, until receiving a complete command signal bag.And transceiver complete such initial decision monitor needed for time the shortest, the time of the most only 100 delicate left and right, thus very power saving.Specific works mode can be found in patent documentation " intelligent electronic label CN 101236611A ".Certainly, in the case of condition is permitted, the part of nodes or all nodes that participate in networking may be used without outer power supply source and power.Each node can be connected with computer by the way of wired or wireless, and as signal transmitting node, initiates a communication process.After reviving due to each node, the time of monitoring signal is the shortest, thus, maintaining like ground dutycycle, such as < 1:1000, in the case of, the sleep wake-up period of each node can be the shortest, the such as 0.5-1 second, the most shorter, this will greatly speed up signal transmitting procedure in whole networking.
Between network node, the mode of information transmission is: information is directly transmitted to the destination node in its signal cover by information transmitting node, or by one or more via nodes, the destination node that information is transferred to not step by step in its signal cover.Specific practice is: transmitting node is by continuously waking up up on channel by the way of (coordination channel) outwards broadcasting command signal bag public incessantly in a period of time, wake up up to be in after periodic sleep is revived and wake up flashy first via node of monitoring signal on channel up public, and set up writing to each other of both sides according to the requirement of command signal bag, and the information needing transmission is transferred to this via node.After completing information transmission, transmitting node will be returned to after periodic sleep is revived the flashy state of monitoring signal on common channel；And the first via node is by the mode the same according to transmitting node, waking up up on channel continuously, information is sent to the second via node, the information launched to second via node also can be received by transmitting node, after transmitting node receives this information, being known that the information that it sends to the first via node, think that the first via node is properly received, otherwise transmitting node will send information to the first via node again.First via node, after having sent information to second via node, also will be returned to after periodic sleep is revived the flashy low power consumpting state of monitoring signal in common frequency channel.By that analogy, until information is sent to destination node.See accompanying drawing one
Here the information collecting center that transmitting node is connected with computer often, such as active electronic label read write line；And destination node and via node are often any one sensor information collection point；In all the sensors acquisition node, including via node and destination node, if use outer power supply, they usually by be in continuously rather than intermittence wake up the state of monitoring signal on channel up public, any transmitting node is when launching information to them, then it is no longer necessary to use the most uninterrupted identical mode waking up command signal up of repeat its transmission within a period of time, and has only to the mode using single bag signal to launch.The most not only quickening information is transmitted, and the power consumption of other network node will be saved.Thus, in place with good conditionsi, utilizing outer power supply source as far as possible is the sensor power in network.
Transmitting node is sent in the information of via node, including the address of via node each in whole repeated link.This repeated link is formed as follows:
If there being 200 nodes in a sensor information acquisition zone, and directly communication can not be fully achieved between all nodes, many internodal communications are required for relaying and just can complete.In order to find shortest path (via node is minimum) between any two node, the communication link of signal transmission effect preferably (received signal strength is the highest), system needs to find out other node ID that directly can communicate around each node with this node, and realize communication quality (receiving signal strength expression when these nodes send ID with this node) signal intensity when communicating with this node the highest, it is the best that we are considered as communication channel quality.The all nodes that can communicate with, due to blocking and the signal transmission environment of complexity of possible building, might not be distributed in a border circular areas centered by this node, but a relative complex shape, here represent with a simple ellipse, as shown in accompanying drawing two.Meanwhile, in all these nodes, be not leave this Centroid physical distance closer to node the most just have more preferable signal intensity or communication quality.We can represent the communication linkage between two nodes with an arrow, represents this link with No. ID of two nodes, represents the signal intensity (receiving RSSI value during ID) during connection with R, represents link-attached quality.R value is the highest, represents that communication link quality is the best.Such as IDa-IDb-R, represents node ID a and launches signal, and node ID b receives signal, and R represents signal intensity during two inter-node communications.
Each node that system would be required in these 200 nodes is required for outwards broadcasting order of once making an inventory, and gathers the node ID that may collect around this node, and the signal intensity of correspondence.Thus obtain all nodes that can directly communicate communication linkage between any two and link-quality.This actually reflects in the range of whole sensor network the basic communication condition between node, including various buildings on factors such as the impacts of communication.As long as node location is constant, this condition would not occur big change, unless the great environmental condition change of the signal transmission that makes a difference in region, now, then needs the most such information of our Resurvey.In network, between all nodes, the determination of best communication link is namely based on such a changeless communication environment, and these data obtained determine.Utilize this data, computer will provide all link connection information between any two node, including the shortest link connection information, and link link information during consideration link-quality (each link received signal strength of whole link is higher than certain value).When needs between the two nodes, or when read write line and network transmit information between any one node, transmitting node or read write line are by the information command of outwards broadcast, list in link from the first via node to ideal address of node information, carry out data transmission as the method previously described.Accompanying drawing three is that transmitting terminal launches the id information that should include involved all link nodes in signal packet.
Accompanying drawing illustrates:
Figure one, information transmission mode between node
Figure two, the foundation of communication link
Figure three, transmitting node launches the link content that signal should include
Detailed description of the invention:
Each node in network has one No. ID, by our read write line all the time in the presence of for transmitting node, by connecting the computer of read write line, according to aforesaid information transmission mode, first pass through read write line, the node that can directly communicate with to read write line one by one, issues all node ID requiring that each node collection can communicate about, and the instruction of received signal strength (RSSI).And then by the method for aforementioned communication, by via node, remaining node is issued same instruction one by one, the link communication condition information of communication between all nodes in obtaining whole region.
Then by computer, according to the mode of head and the tail coupling, hunt out the link link information to all other network node of the read write line as network launches node, or any one network node is to the link connection information of other network node.When read write line needs to during as certain destination node transmission information, then according to the link information of read write line to this node by all via node ID involved by wherein, as the transmitting address of command signal bag, it is included in the command signal bag of transmitting node.Carry out information transmission as the method previously described.When read write line requires the information gathering destination node, destination node will carry out reverse information transmission according to this link information.
When other node in network needs to be in communication with each other, carry out taking same mode.
Claims (7)
1. a wireless low-power consumption Sensor Network based on low duty ratio mode of operation, it is characterised in that this network can be connected the wireless transmit/receive units node of sensor or other working cell, a control computer and corresponding application software composition by known several；Computer and software are for needing to be managed whole sensor network according to application；Each node has fixing installation site, can realize radio communication to each other；Transceiver in each node uses periodic sleep usually, after reviving on preassigned channel the working method of the flashy low duty ratio of monitoring signal, this flashy listening period is the shortest, but be enough to be determined whether by the radio frequency features of received signal to listen to there is the signal that can realize radio communication therewith, only when listening to this signal, transceiver in Transmit-Receive Unit just can extend listening period, until receiving a complete command signal bag；The part of nodes or all nodes that participate in networking may be used without outer power supply source and power, use the node of outer power supply source, then can be at and each node can be connected with computer by the way of wired or wireless, and as signal transmitting node, initiate a communication process.
2. according to claim 1, it is characterized in that, between network node, the mode of information transmission is: transmitting node is by continuously within one period not less than node sleep wake-up period, uninterrupted the most repeatedly in the public mode waken up up on channel to first via node emission instruction signal bag, wake up up to be in after periodic sleep is revived and wake up flashy first via node of monitoring signal on channel up public, set up writing to each other and carrying out communication for information of both sides；After completing communication for information, transmitting node will be returned to after periodic sleep is revived the flashy state of monitoring signal on common channel；And the first via node is by the mode same according to transmitting node, waking up up on channel, information is sent to aforesaid transmitting node and the second via node, first via node, after having sent information to second via node, also will be returned to after periodic sleep is revived the flashy low power consumpting state of monitoring signal in common frequency channel；By that analogy, until information is sent to destination node.
3. according to claim 2, it is characterized in that, described via node link determines as follows: first system is by the way of each node is made an inventory one by one, obtain and the node ID of communication and the signal strength values of correspondence around each network node, can be set up therewith, so that it is determined that the communication environment condition between whole sensing network orientation interior nodes；Secondly, according to the transmitting node determined and the ID of destination node, method according to link nodes ID head and the tail coupling, computer is utilized to find out all communication links with actually used value between all transmitting nodes and intended recipient node, including the node ID involved by each of the links and connection signal intensity；Last according to Setting signal transmitting node and the ID of signal receiving node, length according to each link, link communications signal is good and bad, the number of the via node quantity with outer power supply source comprised in each link, need with reality application, find out one or several optimal communication link, and link information is embedded in internodal signal of communication bag.
4. according to claim 2, it is characterized in that, each via node is when launching signal continuously to next via node, the previous transmitting node of this via node, also this information can be received, and by according to whether receive the signal success the most that this signal launched to differentiate its first this via node of forward direction and received by this via node.
5. according to claim 1, it is characterized in that, when one of them node is connected with computer as active electronic label read write line, whole system reforms into one and can realize between label with label communicating, all labels all have relay function, sensor data acquisition function, and the active electronic tag system of equipment control function；The transmitting node of the most all links is exactly read write line node.
6. a network-building method with fixed position network node, it is characterized in that, system first passes through the result of communication of each networking node and other node in signal cover about, obtains whole network range under existing fixed communication environmental condition, the communication conditions between each node；According still further to the transmitting node determined and the ID of destination node, according to the method for link nodes ID head and the tail coupling, utilize computer to find out between all transmitting nodes and intended recipient node to have all fixed line communication link of actually used value；Finally communicate further according to the link selected.
7. the information transmitting methods used between several wireless transmit/receive units of low duty ratio working method, it is characterized in that, all Transmit-Receive Units the most all use periodic sleep, after reviving in preassigned common frequency channel the flashy working method of monitoring signal；Transmitting node is by continuously within one period not less than node sleep wake-up period, uninterrupted the most repeatedly in the public mode waken up up on channel to first via node emission instruction signal bag, wake up up to be in after periodic sleep is revived and wake up flashy first via node of monitoring signal on channel up public, set up writing to each other and carrying out communication for information of both sides；After completing communication for information, transmitting node will be returned to after periodic sleep is revived the flashy state of monitoring signal on common channel；And the first via node is by the mode same according to transmitting node, waking up up on channel, information is sent to aforesaid transmitting node and the second via node, first via node, after having sent information to second via node, also will be returned to after periodic sleep is revived the flashy low power consumpting state of monitoring signal in common frequency channel；By that analogy, until information is sent to destination node.
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| CN108566687A (en) * | 2018-04-25 | 2018-09-21 | 成都西谷曙光数字技术有限公司 | LDSW ultra-low power consumption wireless self-organizing network system and communication means |
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| CN108737672A (en) * | 2018-04-12 | 2018-11-02 | 广东电网有限责任公司 | A kind of prevention waterlogging early warning system and its communication means |
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