CN103108387A - Establishment method of multi-hop wireless self-organization network applied to agriculture - Google Patents
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Abstract
The invention relates to an establishment method of a multi-hop wireless self-organization network applied to agriculture. The establishment method comprises the following steps: an initial network comprises a source node, a child node list and a common node, and the source node is used for sending a networking broadcast frame; the source node distributes a logical topology frame for a node which sends a networking response frame after receiving the networking response frame, the node mark which sends the networking response frame and the corresponding logical topology frame are stored in the child node list, a networking acknowledgement frame is sent to the node which sends the networking response frame, and therefore a networking accomplishment state is achieved; the node which sends the networking response frame updates a father node of the node and the logical topology frame after the networking acknowledgement frame is received; and the node which sends the networking response frame delays according to the logical topology frame of the node and carries out networking with the node as the source node till all nodes accomplish networking when the delay is finished. The establishment method can reduce overall power consumption of the network, reduce demands on hardware and quickly obtain a topological structure of the network under the condition that basic needs can be met.
Description
Technical field
The present invention relates to the cordless communication network technical field, particularly relate to a kind of method for building up that is applied to the multi-hop wireless self-organizing network of agricultural.
Background technology
Continuous develop rapidly along with MEMS (micro electro mechanical system), radio communication and digital circuit has low-power consumption, low cost, and the sensor node of multi-functional characteristic occurs in a large number., more and more come into one's own also because of its application prospect widely based on the sensor network of a large amount of sensor node deployments.Wireless sensor network can be widely used in the military and civilian environment, carries out the collection of information and processing, to the detection of image tracing and network environment, especially is fit to be configured in the occasions such as field, traffic main artery, medical treatment and security department.
And wireless sensor network application agriculturally has its certain particularity, is embodied in: 1, network size is comparatively huge, and interstitial content is more, the relatively dispersion but node distributes, and networking progression is many.2, message transmission rate is low, and the data upload number of times is not frequent, and is less demanding to the synchronous error of time.3, the position is not random especially during node placement, and in general plot, a kind of crops of plantation, configure a sensing node, and the node placement position must be in this piece ground, and other nodes are placed on respectively in other ground, and the general comparison rule in plot is rectangle.But after having placed, a very long time (being generally the growth cycle of crops) interior position is fixed.4, the transmission direction of data is more single, only needs to be transferred to gateway by certain mode and gets final product, and does not need the information interaction of extensive adjacent node.5, node is in case throw in, and keep operating time of quite growing, so require more low-power consumption.
Existing wireless self-organization network generally adopts the two-layer structure of grouping to realize, so-called two-layer structure, refer to all nodes in wireless self-organization network are divided into group leader's node and group member's node, formation group internal layer between group leader's node of a group and group member's node, formation group interbed between group leader's node of each group and base station.Other nodes that group leader's node broadcasts is set up around vertical message invitation add group, other nodes except group leader's node are after receiving the vertical message of establishment, add the group of setting up from own nearest group leader's node, become group member's node, later on directly with group leader's node communication, the direct and base station communication of group leader's node.Such networking mode is more flexible, can communicate by letter between arbitrary node, but be used in network safeguarding that the information of route is many, and power dissipation ratio is larger; And the placement of will arranging in pairs or groups mutually of group leader's node and ordinary node, and the application characteristic of contrast Sensor Network aspect crops, this mode has increased cost than the existence that is easier to cause redundant node; Again, a general sensing network adopts same frequency, collision problem exists always, although all adopt the CSMA/CA technology in now a lot of radio frequency chips, but this mode has increased the average operation time that successfully sends a data chip, and the power consumption of radio frequency chip when the state of transmission is maximum, so just increased greatly the average power consumption of node.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method for building up that is applied to the multi-hop wireless self-organizing network of agricultural, utilize the characteristics of agriculture radio sensing network self, in the situation that satisfy basic need, reduce the overall power of network, the requirement of reduction to hardware, and can draw fast topology of networks.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method for building up that is applied to the multi-hop wireless self-organizing network of agricultural is provided, comprises the following steps:
(1) initial network comprises source node, child node list and ordinary node, and described source node sends the networking broadcast frame;
(2) after described source node is received the networking acknowledgement frame, for sending the node assignment logic topology frame of networking acknowledgement frame, and node identification and the corresponding logical topology frame that will send the networking acknowledgement frame deposit the child node list in, send the networking acknowledgement frame to the node that sends the networking acknowledgement frame, complete attitude thereby enter networking;
(3) after the node that sends the networking acknowledgement frame is received the networking acknowledgement frame, upgrade sign and the logical topology frame of the father node of oneself;
(4) node that sends the networking acknowledgement frame is delayed time according to own logical topology frame, after the time-delay end with self as source node repeating step (2) to step (4) until all nodes are completed networking.
The time synchronized frame that also comprises ordinary node wait source node broadcast transmission after described step (4), receive the temporal information of rear renewal oneself, the ordinary node of last one deck carries out sending at the appointed time the logical topology frame of oneself to father node after time synchronized, father node forwards this logical topology frame to the father node of oneself again, until pass to source node.
In described step (2), source node sends the node assignment logic topology frame of networking acknowledgement frame to all, and deposit all node identification and corresponding logical topology frames that send the networking acknowledgement frame in the child node list, send the networking acknowledgement frame to all nodes that send the networking acknowledgement frame, complete attitude thereby enter networking.
after in described step (2), source node is received the networking acknowledgement frame at every turn, record sends the energy indication of this frame in the radio frequency chip of the sign of node of networking acknowledgement frame and this node, after the stand-by period finishes, choose m from the node identification of all records according to the energy size, wherein, m is the frequency points that radio frequency chip is supported, what energy was large preferentially chooses, if recording number, all are less than m, all choose, then, all are deposited in the child node list by the sign of the node of screening and the logical topology frame that source node is distributed to each node, and the node that deposits in the child node list successively sends the networking acknowledgement frame, and enter networking and complete attitude.
Beneficial effect
Owing to having adopted above-mentioned technical scheme, the present invention compared with prior art, have following advantage and good effect: the present invention proposes a kind of method for building up that is applicable to the radio sensing network of agricultural, the method takes into full account the application characteristic of agriculture sensing network, in the situation that satisfy basic need, reduce the overall power of network, reduce the requirement to hardware.It is the mode of each the child node assignment logic topology frame LOG_ID of oneself that the network creating method that the present invention proposes adopts father node, logical topology frame LOG_ID can be used for TDMA and sends the networking broadcast frame in setting up process, can be used for quick generating network topological diagram after setting up end.Anticollision measure of the present invention adopts TDMA to realize in conjunction with the mode of CSMA/CA, better improves the success rate that once sends, and reduces node power consumption.The agriculture Sensor Network of utilization of the present invention is to the insensitive and single characteristics of data transfer direction of time synchronization error, reduced between node maintaining routing information mutual, reduces power consumption, adopts tree, better caters to data transfer direction unicity characteristics.
Description of drawings
Fig. 1 is the flow chart of the network creating method that proposes of the present invention;
Fig. 2 is the cellular logic topological diagram (LOG_ID is numbered the decimal system) that the method that proposes of the present invention generates;
Fig. 3 is networking broadcast frame structural representation;
Fig. 4 is networking acknowledgement frame structural representation;
Fig. 5 is networking acknowledgement frame structural representation;
Fig. 6 is logical topology frame structure schematic diagram;
Fig. 7 is that in embodiment, network is set up procedure declaration figure;
Fig. 8 is the cellular logic topological diagram (LOG_ID is numbered the decimal system) that generates in embodiment.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiments of the present invention relate to a kind of method for building up that is applied to the wireless self-organization network of agricultural, establishment step is as follows: (1) initial network comprises source node: sign PHY_ID:0xaa, logical topology frame LOG_ID:0x01, father node PARENT_ID:NULL, child node list Children_List full 0; All the other nodes are ordinary node, and are equal, have the whole network unique identification PHY_ID, and other signs LOG_ID, PARENT_ID, Children_List are not assigned state.Each node has three states: 1. networking attitude 1, obtain the node identification PHY_ID of father node and the logical topology frame LOG_ID that father node distributes, namely complete the filling to father node PAREENT_ID and logical topology frame LOG_ID, enter networking attitude 2 after networking attitude 1 is completed; 2. networking attitude 2, the logical topology frame LOG_ID that obtains child node sign PHY_ID and distribute to child node namely completes the filling to oneself some list Children_List, enters networking after networking attitude 2 is completed and completes attitude; 3. attitude is completed in networking, regularly completes various tasks, as time synchronized, uploading data, dormancy etc.(2) after node powered on or restarts initialization, source node and other nodes all were in networking attitude 1, and source node enters the transmission state, and other nodes enter accepting state.Each node needs in networking attitude 1 through " three-way handshake ":
Source node enters accepting state after sending a networking broadcast frame;
All receive ordinary node random delay a period of time of this frame, then enter accepting state after source node (sending networking broadcast frame node) sends the networking acknowledgement frame;
Source node is waited for the t time (in the random delay before t can send according to time, the node that node once sends and CSMA/CA, maximum number of times of transmission is decided), t in the time whenever the networking acknowledgement frame of receiving a node (supposing that node identification PHY_ID is 0xbb), to carry out following operation 1., carry out following the operation 2. (below two kinds of methods are provided) after the t time finishes:
Method one: 1. deposit at child node list Children_List the logical topology frame LOG_ID that the sign PHY_ID (as 0xbb) that receives node and source node will be distributed to the 0xbb node in, the node identification PHY_ID of all networking acknowledgement frames and corresponding logical topology frame LOG_ID deposit in child node list Children_List, and namely the node in all child node list Children_List is all the child node of oneself.2. after stand-by period t finished, the node PHY_ID that deposits in the child node list Children_List successively sent the networking acknowledgement frame, and entered networking and complete attitude.
Method two: a lot of radio frequency chips all can be supported several frequencies (being assumed to be m) now; and most of radio frequency chips have a problem that is very difficult to solve: suppose that the radio frequency chip of node A is when power is 20mw; the scope that can cover in theory is the circle of a radius R=50m centered by this node position; but in the reality test; often can find to be in R1≤R≤50 (the R1 size is decided according to concrete chip) the interior node of scope and often not receive the information of node A; namely this zone is unsettled, is subjected to ectocine very large.For these characteristics, can adopt following 1., 2. the operation: 1. receive the networking acknowledgement frame at every turn, record the energy indication of this frame in its logical topology frame PHY_ID and radio frequency chip, after time t finishes, choose m from the node PHY_ID of all records according to the energy size, what energy was large preferentially chooses, and is less than m if all record number, all chooses.Then, all are deposited in child node list Children_List by the sign PHY_ID of the node of screening and the logical topology frame LOG_ID that source node is distributed to each node; 2. the node PHY_ID that deposits in the child node list Children_List successively sends the networking acknowledgement frame, and enters networking and complete attitude.Annotate: the number of why choosing is because the frequency of last byte representative of the logical topology frame LOG_ID that can be restricted to alternately father node between father and son during subsequent network work less than or equal to m (m is that radio frequency chip is supported frequency points).Namely use same frequency with layer and with the child node of father node, with layer but the child node of different father nodes is used different frequencies, can further prevent from so again sending the collision conflict.Receive the node of networking acknowledgement frame, upgrade oneself father node PARENT_ID and logical topology frame LOG_ID, and enter networking attitude 2.The node state of not receiving the networking acknowledgement frame still is networking attitude 1, continues to wait for reception networking broadcast frame.
(3) ordinary node after entering networking state 2, is delayed time for No. LOG_ID according to the logical topology frame of oneself, namely by the mode of TDMA, self is treated as the process of " source node " repetition " three-way handshake " source node part.Obtain child node PHY_ID and for child node assignment logic topology frame LOG_ID, fill child node list Children_List in due to the former ordinary node that is in networking attitude 1 of carrying on as before of distance, then storage child node information enter networking and complete attitude.The ordinary node of every one deck all can repeat the process of " three-way handshake " after entering networking attitude 2, obtaining child node is also its assignment logic topology frame LOG_ID.But the node of same layer is completed " three-way handshake " process by its logical topology frame LOG_ID time-delay in the TDMA mode, and the node of lower one deck only could begin this process after the last layer node is completed this process, and this also controls by logical topology frame LOG_ID.
(4) after above-mentioned steps was completed, in network, all nodes comprised that source node and ordinary node have all entered networking and completed attitude theoretically.1. all ordinary nodes are entering after networking completes attitude, wait for the time synchronized frame of source node broadcast transmission, upgrade the temporal information of oneself, the ordinary node of last one deck, the ordinary node that namely there is no child node, carry out sending at the appointed time the LOG_ID (logical topology frame) of oneself to father node after time synchronized, father node forwards this LOG_ID to the father node of oneself again, until pass to source node.Source node stores away the logical topology frame of receiving, the logical topology frame LOG_ID that is last one deck ordinary node according to the data in frame just can know the logical topological structure of whole network, source node can be passed to computer to these data by network interface or serial ports, and computer just can be drawn the logical topology figure of network.Why being referred to as logical topology figure, is because only can't draw PHY_ID corresponding to each node in logical topology figure according to the LOG_ID of afterbody ordinary node.The situation of specifically not being concerned about the concrete node PHY_ID of each node of topological diagram but this quadrat method is applicable to think to know network topological diagram fast.Certainly after network builds up, source node can specifically be established PHY_ID corresponding to each node in logical topology figure by the mode that sends physical topology inquiry frame.
In the present invention, the coded system of logical topology frame LOG_ID is as follows: the logical topology frame LOG_ID of source node is 1; The logical topology frame LOG_ID of child node is the logical topology frame LOG_ID#Index (wherein # is connector, and Index is the sequence number of this child node in belonging to all nodes of same father's node) of its father node.Logical topology frame LOG_ID as source node is 1, with a bytes store, suppose that the child node (being the node of the second layer) of source node has 5, source node is for No. LOG_ID 11 to the logical topology frame of child node distribution, 12,13,14,15 ... with two bytes store, as 14, first byte is deposited 1, the second byte and is deposited 4.In like manner the node LOG_ID of the 3rd layer stores with three bytes, logic of propositions topology frame LOG_ID is that 14 child node has 15, the logical topology frame LOG_ID of its child node is 141,142,, 1415, as 1415, three bytes are respectively 1,4,15, and namely the logical topology frame LOG_ID of the node of n layer stores with n byte.Form after logical topology frame coding in the present invention is completed as shown in Figure 2.This kind of logical topology frame LOG_ID coded system has two kinds of effects: once: source node only can draw the logical topology figure of network according to the logical topology frame LOG_ID of afterbody ordinary node.Two: be used for the TDMA mode and transmit, can allow according to logical topology LOG_ID be in same layer but the node of different father nodes, be in same layer and separate on the time when frame transmit with the node of father node.Can followingly operate in real work: suppose that its logical topology frame of the node LOG_ID that is in the n layer is respectively with n bytes store: 1, x
1, x
2X
n-1, set up at network that in process, this node is x entering the rear delay time that begins repetition " three-way handshake " of networking attitude 2
n-1* m+x
n-2* m
2+ ... x
1* m
n-1+ 1*m
n, the value of the chronomere of time-delay (ms, us) and m specifically can calculate according to the processing speed of using processor, the nodes of every layer.Like this, after time-delay transmission, just reached the requirement of above-mentioned TDMA, the anti-collision that adds CSMA/CA detects keeps out of the way transmission, can better guarantee point-to-point between the reliability of transmission, thereby raise the efficiency.
The below further illustrates the present invention with a specific embodiment.
As shown in Figure 7, the node number is that 6, PHY_ID is respectively 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, node branch as shown in the figure, 0xaa is source node, LOG_ID is 0x01, the communication distance of node is 50 meters, as shown in Figure 1, network to set up process as follows:
After on all nodes of S1, the some initialization is completed, enter networking attitude 1;
The S2 source node sends networking broadcast frame (see figure 3), enters accepting state, stand-by period t;
0xbb, the 0xcc of S3 in the source node communication range receives the networking broadcast frame, respectively random delay and reply networking acknowledgement frame (see figure 4);
The S4 source node is received the networking acknowledgement frame of 0xbb, 0xcc, be respectively it and distribute two byte LOG_ID:0x010x02 and 0x010x01, then the sign PHY_ID of child node and corresponding logical topology frame LOG_ID(see Fig. 6) deposit child node list Children_List in, the most backward node 0xbb, 0xcc send respectively networking acknowledgement frame (see figure 5), and source node enters networking and completes attitude;
S5 node 0xbb, 0xcc receive the networking acknowledgement frame, upgrade oneself father node PARENT_ID and logical topology frame LOG_ID, and enter networking attitude 2;
The S6 node 0xcc 0x01*m that delays time
2Begin to send the networking broadcast frame after+0x01*m, due to the scope that does not have node in its communication, so node is waiting for that reception t after the time, does not receive any networking acknowledgement frame, so mark oneself is last node layer;
The S7 node 0xbb 0x01*m that delays time
2Begin to send the networking broadcast frame after+0x01*m, wait for receiving t after the time, receive the networking acknowledgement frame of node 0xdd, for it distributes the logical topology frame LOG_ID:0x010x020x01 of three bytes, fill child node list Children_List, enter networking after transmission networking acknowledgement frame and complete attitude;
After S8 node 0xdd receives the networking acknowledgement frame, upgrade oneself father node PARENT_ID, logical topology frame LOG_ID, and enter networking attitude 2;
The S9 node 0xdd 0x01*m that delays time
3+ 0x02*m
2Begin to send the networking broadcast frame after+0x01*m, wait for and receive t after the time, receive the networking acknowledgement frame of node 0xee, 0xff, for it distributes nybble LOG_ID:0x010x020x010x01 and 0x010x020x010x02, fill child node list Children_List, enter networking after transmission networking acknowledgement frame and complete attitude;
S10 node 0xee, the 0xff 0x01*m that delays time respectively
4+ 0x02*m
3+ 0x01*m
2+ 0x01*m and 0x01*m
4+ 0x02*m
3+ 0x01*m
2+ 0x02*m sends the networking broadcast frame, waits for receiving t after the time, does not receive acknowledgement frame, and mark oneself is last node layer, enters networking and completes attitude;
S11 enters the time synchronized frame that all ordinary nodes wait source nodes transmissions of attitude are completed in networking, after synchronously completing, the ordinary node that is labeled as last node layer t1 at the appointed time sends the logical topology frame to father node, and all the other ordinary node forwarding logics topology frames are until source node;
The S12 source node resolves at t1+t2 the logical topology frame that all are received constantly, and data are reached server maps logical topology figure, (be the coded system of the clearer expression of energy LOG_ID, the numeral in logical topology figure is decimally expression all) as shown in Figure 8.
Claims (4)
1. a method for building up that is applied to the multi-hop wireless self-organizing network of agricultural, is characterized in that, comprises the following steps:
(1) initial network comprises source node, child node list and ordinary node, and described source node sends the networking broadcast frame;
(2) after described source node is received the networking acknowledgement frame, for sending the node assignment logic topology frame of networking acknowledgement frame, and node identification and the corresponding logical topology frame that will send the networking acknowledgement frame deposit the child node list in, send the networking acknowledgement frame to the node that sends the networking acknowledgement frame, complete attitude thereby enter networking;
(3) after the node that sends the networking acknowledgement frame is received the networking acknowledgement frame, upgrade sign and the logical topology frame of the father node of oneself;
(4) node that sends the networking acknowledgement frame is delayed time according to own logical topology frame, after the time-delay end with self as source node repeating step (2) to step (4) until all nodes are completed networking.
2. the method for building up of multi-hop wireless self-organizing network that is applied to agricultural according to claim 1, it is characterized in that, the time synchronized frame that also comprises ordinary node wait source node broadcast transmission after described step (4), receive the temporal information of rear renewal oneself, the ordinary node of last one deck carries out sending at the appointed time the logical topology frame of oneself to father node after time synchronized, father node forwards this logical topology frame to the father node of oneself again, until pass to source node.
3. the method for building up of multi-hop wireless self-organizing network that is applied to agricultural according to claim 1, it is characterized in that, in described step (2), source node sends the node assignment logic topology frame of networking acknowledgement frame to all, and deposit all node identification and corresponding logical topology frames that send the networking acknowledgement frame in the child node list, send the networking acknowledgement frame to all nodes that send the networking acknowledgement frame, complete attitude thereby enter networking.
4. the method for building up of multi-hop wireless self-organizing network that is applied to agricultural according to claim 1, it is characterized in that, after in described step (2), source node is received the networking acknowledgement frame at every turn, record sends the energy indication of this frame in the radio frequency chip of the sign of node of networking acknowledgement frame and this node, after the stand-by period finishes, choose m from the node identification of all records according to the energy size, wherein, m is the frequency points that radio frequency chip is supported, what energy was large preferentially chooses, if recording number, all are less than m, all choose, then, all are deposited in the child node list by the sign of the node of screening and the logical topology frame that source node is distributed to each node, and the node that deposits in the child node list successively sends the networking acknowledgement frame, and enter networking and complete attitude.
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| CN106604410B (en) * | 2017-02-20 | 2020-03-27 | 中国电子科技集团公司第二十九研究所 | Method for realizing wireless self-organizing network establishment based on conflict detection and competition mode |
| CN110139399A (en) * | 2019-04-25 | 2019-08-16 | 中国科学院上海微系统与信息技术研究所 | A kind of mobile multi-hop ad hoc network and its network-building method |
| CN111628818A (en) * | 2020-05-15 | 2020-09-04 | 哈尔滨工业大学 | Distributed real-time communication method and device for air-ground unmanned system and multi-unmanned system |
| CN111628818B (en) * | 2020-05-15 | 2022-04-01 | 哈尔滨工业大学 | Distributed real-time communication method and device for air-ground unmanned system and multi-unmanned system |
| CN113766602A (en) * | 2020-06-04 | 2021-12-07 | 北京新岸线移动多媒体技术有限公司 | Networking method of wireless network and wireless network structure |
| CN112637923A (en) * | 2020-12-24 | 2021-04-09 | 南方电网数字电网研究院有限公司 | Node confirmation method and device, computer equipment and storage medium |
| CN112637923B (en) * | 2020-12-24 | 2022-11-11 | 南方电网数字电网研究院有限公司 | Node confirmation method and device, computer equipment and storage medium |
| CN112698606A (en) * | 2020-12-28 | 2021-04-23 | 国网北京市电力公司 | Processing method for collected message |
| CN113766596A (en) * | 2021-10-27 | 2021-12-07 | 广东卓维网络有限公司 | Wireless network ad hoc network method and system |
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