CN102695180A - Mixed sink node WSN and data collection method thereof - Google Patents
Mixed sink node WSN and data collection method thereof Download PDFInfo
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Abstract
The present invention relates to a mixed sink node WSN and a data collection method thereof. The WSN includes a fixed sink node, at least one mobile sink node and more than two sensor nodes. The method comprises the following steps: the mobile sink node periodically distributes a beacon frame to an adjacent sensor node; the sensor node which receives the beacon frame sends a data packet to a mobile sink node in a hop range, or temporally stores a delay tolerance data packet to a buffer area, and sends a real-time data packet to a next hop sensor node of the fixed sink node according to the routing; the sensor node which does not receive the beacon frame sends the data packet according to the routing. According to the mixed sink node WSM and the data collection method, a problem that a WNS hotspot area and a present WSN can not process different data types at the same time is solved.
Description
Technical field
(Wireless Sensor Networks, WSN) technical field relate in particular to a kind of mixing sink node WSN and method of data capture thereof to the present invention relates to wireless sensor network.
Background technology
Along with the development of Internet of Things, WSN has become the hot issue of people's research as the nerve endings of Internet of Things.Typical WSN is made up of a large amount of small (sensor) node of the wireless senser with perception and fixing compiling (sink) nodes.They are deployed in the different application scenes, and the sensor node passes to the sink node with the data of the perception mode through single-hop or multi-hop.Research shows that the near-end sensor node of sink node causes its energy consumption fast more than far-end sensor node owing to load is excessive, causes hot spot region problem (hot spot).This uneven energy consumption has reduced the performance of WSN, has shortened the life-span of WSN simultaneously greatly.
Be to prolong the life-span of WSN, the researcher has introduced to move in WSN and has compiled the sink node, and the mobile sink node is meant in WSN the sink node that can move according to fixed route, and its mobile alignment and speed can be through network controls; Constantly shift the hot spot region through moving moving of SINK node, the equalizing network Energy distribution is to reach the purpose of life-saving.The solution that proposes at present has MULE, RP, MILP, GMRE method etc.
The MULE method is to let the mobile sink node visit all the sensor nodes among the WSN successively, and when the mobile sink node arrived the communication range of source sensor node, source sensor node all sent to the mobile sink node through a jumping mode with data.Though this method has been eliminated the relaying load of node, has reduced the network energy consumption, has brought very large data delay, only be applicable to that data type is the WSN that postpones the tolerance type.
The RP method is exactly that data delay proposes in the MULE method in order to reduce; In the RP method; The mobile sink node is only visited selected several meeting points, and the data in the zone are cached to the place, meeting point earlier, and carry out possible data fusion; When the mobile sink node arrives its communication range, its data in buffer is all sent to the mobile sink node.Though this mode can reduce the moving range of mobile sink node; Improve delay performance; But still only being fit to data type for postponing the WSN of tolerance type, time-delay tolerance type data are meant that the type data to the time-delay relative insensitivity, can tolerate certain delay in transmittance process.
Two kinds of methods of MILP and GMRE are applicable to that all data type is the WSN of real-time, and the real-time data are meant the type data to delay-sensitive, need to transmit in real time, and it is more little good more to delay time.In these two kinds of methods, the mobile sink node in fixing several position, is selected next best mobile dwell point according to the real-time dump energy information of sensor node among full WSN or the local WSN.These two kinds of methods can both improved network life in varying degrees; But all need each mobile sink node to know the geographical location information of oneself; This is difficult realization in the network of many reality; Because under the real-time network scene, the mobile sink node whenever moves once all will upgrade the whole network route in addition, and extra routing cost makes that the optimization of network performance that is brought by the mobile sink node is unsatisfactory.
Consider in addition in the application scenarios of reality, like open-air ECOLOGICAL ENVIRONMENTAL MONITORING, agriculture growing environment monitoring; Earthquake zone environmental monitoring etc.; The sensor node mainly is periodically to upload Monitoring Data in the network, and these data upload cycles are longer relatively, and allows certain time delay; But when monitoring of environmental had abnormal conditions to take place, because of the Event triggered regional area needs to report in the short time bursty data, these data all had very high requirement to delay performance and packet loss.So the demand for services that how can satisfy different types of data can well prolong network life again, become the new problem that active demand of scientific and technical personnel in the industry solves.
Summary of the invention
Main purpose of the present invention provides a kind of mixing sink node WSN and method of data capture thereof, with the problem that solves the WSN hot spot region and can not handle two kinds of data types simultaneously.
The present invention provides a kind of mixing sink node WSM, comprises fixedly sink node, at least one mobile sink node and a plural sensor node, and above-mentioned WSM integral body is deployed as circle;
Said fixing sink node is arranged on the center of above-mentioned WSN;
Above-mentioned sensor node is the center of circle with said fixing sink node, evenly is arranged in the above-mentioned WSM coverage;
Above-mentioned mobile sink node moves radius around said fixing sink node motion according to preset move mode to preset.
Preferably, above-mentioned mobile sink node is to the sensor node distribution beacon frame that is adjacent, and the packet of collection sensor node transmission;
Above-mentioned sensor node judges whether to receive beacon frame, and when receiving beacon frame, and whether the sink node of judging the above-mentioned beacon frame of distribution is in one of which jumping scope, if then packet is sent to above-mentioned mobile sink node; Otherwise; The type of judgment data bag; The tolerance type of will delaying time packet is temporary to buffer area; Next jumps sensor node with the real-time packet sends to said fixing sink node according to route, and perhaps when not receiving beacon frame, next jumps sensor node with packet sends to said fixing sink node according to route.
Preferably, above-mentioned mobile sink node provides parameter that interface is set;
Above-mentioned sensor node is provided with the state timer, and when receiving beacon frame, above-mentioned sensor node starts above-mentioned state timer; Simultaneously oneself state is labeled as the neighbor node of mobile sink node; And when above-mentioned state timer duration of work is received beacon frame once more, restart above-mentioned state timer, perhaps at above-mentioned state timer to after date; Cancel status indication, and the packet in the buffer area is sent to next jumping sensor node of said fixing sink node according to route.
Preferably; Above-mentioned sensor node judges that whether the remaining space of its buffer area is smaller or equal to preset value; And at above-mentioned remaining space smaller or equal to preset value, and the mobile sink node is not in one of which jumping scope the time, according to first in first out (First Input First Output; FIFO) principle the packet in its buffer area is sent to said fixing sink node successively according to route next jump sensor node, until above-mentioned remaining space greater than above-mentioned preset value.
The present invention also provides a kind of method of data capture of the sink of mixing node WSN, and said method may further comprise the steps:
The mobile sink node is periodically to the sensor node distribution beacon frame that is adjacent;
The sensor node of receiving beacon frame judges that above-mentioned mobile sink node is whether in one of which jumping scope, if then packet is sent to above-mentioned mobile sink node; Otherwise the tolerance type of will delaying time packet is temporary to buffer area, and the real-time packet is sent to fixedly next jumping sensor node of sink node according to route;
The sensor node of not receiving beacon frame sends to fixedly next jumping sensor node of sink node according to route with packet.
Preferably, said method at above-mentioned mobile sink node periodically before the sensor node distribution beacon frame step that is adjacent, further comprising the steps of:
Set up at least one respectively for all the sensor nodes in netting and arrive the fixedly route of sink node;
Calculate the mobile radius of above-mentioned mobile sink node;
For being provided with, above-mentioned mobile sink node moves radius and move mode.
Preferably, the best radius U of moving of above-mentioned mobile sink node calculates through following formula
Wherein,
π (R
2-(u-r)
2) p θ+π (u-r)
2, β=2arcsin (r/ (u+r)), θ=1-M*arcsin (r/u)/π,
Expression network node maximum energy consumption, θ representes that mobile sink node neighbor node sends to the fixedly probability of sink node with real time data, M is the number of mobile sink node; R is a network coverage radius, and r is a sensor node communication radius, and ρ is a sensor node data uploading rate; P is the ratio that the sensor node is uploaded real time data in the data; And p ∈ [0-1], ε is the mobile radius of sink node for the energy that the sensor node sends and the receiving element data need consume, u for moving.
Pairing u is that the best of mobile sink node moves radius U when getting minimum value as
.
Preferably, above-mentioned move mode is:
Above-mentioned mobile sink node behind the whenever mobile setpoint distance, stops setting-up time from start bit.
Preferably, the above-mentioned sensor node of receiving beacon frame is operated below also carrying out when receiving beacon frame:
The starting state timer is labeled as oneself state the neighbor node of mobile sink node.
Preferably, the above-mentioned sensor node of receiving beacon frame is judged above-mentioned mobile sink node not in one of which jumping scope the time, operation below also carrying out:
The type of judgment data bag.
Preferably, the above-mentioned sink node of the receiving beacon frame tolerance type packet of will delaying time is temporary behind buffer area, also carries out following steps:
Whether the remaining space of periodically judging buffer area is smaller or equal to preset value; If; Next that then packet in the buffer area is sent to fixing sink node through route successively according to the FIFO principle jumped sensor node, until above-mentioned remaining space greater than above-mentioned preset value.
Preferably, the above-mentioned sensor node of receiving beacon frame if receive beacon frame once more, is then restarted above-mentioned state timer at above-mentioned state timer duration of work; Otherwise, to after date, cancel status indication at above-mentioned state timer, and the packet in the buffer area sent to fixedly next jumping sensor node of sink node according to route.
Preferably, above-mentioned packet comprises the packet of said sensor node self generation and the packet that other sensor nodes send.
The present invention utilizes and moves the mode that combines with fixing sink node and solve the problem that WNS hot spot region and existing WSN can not handle different types of data simultaneously; Under the prerequisite that satisfies the different types of data demand; Prolong network life to greatest extent, and reduced data delay.
Description of drawings
Fig. 1 is the present invention's mixing sink node WSN principle schematic;
Fig. 2 is the flow chart of the present invention's mixing sink node WSN method of data capture;
Fig. 3 is that the state variation of sensor node among the present invention concerns sketch map;
Fig. 4 is a flow chart of receiving the sensor node monitoring state timer of beacon frame among the present invention;
Fig. 5 is a flow chart of receiving the sensor node monitoring buffer area of beacon frame among the present invention.
The realization of the object of the invention, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Further specify technical scheme of the present invention below in conjunction with Figure of description and specific embodiment.
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, be mixing sink node WSN principle schematic according to the invention; Present embodiment is an example so that a mobile sink node to be arranged among the WSN, in the practical application, a plurality of mobile sink nodes can be arranged, among the figure, ● expression sink node, zero expression sensor node, radius is the motion track that the broken circle of u is represented the mobile sink node; Radius is the communication radius of the solid line circle expression sensor node of r; Radius is the covering radius of the solid line circle expression WSN of R, and arrow is represented data flow.WSN is deployed to circle, and fixedly the sink node is arranged on the center of WSN, and the sensor node is the center of circle with fixing sink node, evenly is arranged in the WSN coverage; The mobile sink node with preset mobile radius U according to preset move mode around fixing sink node motion.Sensor node in mobile sink node communication scope is the sensor node that is adjacent.
Among the present invention, the mobile sink node is used to provide parameter that interface is set, and in moving process, distributes beacon frame to the sensor node that is adjacent, and notifies it to have information, and collects the packet that the sensor node sends.
The sensor node has the state timer, and the work duration t of this state timer is less than required duration T of one week of mobile sink node motion;
The sensor node is used to judge whether the beacon frame of receiving that the mobile sink node sends, and when receiving beacon frame, and the starting state timer is labeled as oneself state the neighbor node of mobile sink node; Whether the mobile sink node of judging the distribution beacon frame simultaneously is in one of which jumping scope; If; Then packet is sent to above-mentioned sink node, otherwise, the data type of judgment data bag; The tolerance type of will delaying time packet is temporary to its buffer area, the real-time packet is sent according to route be given to fixedly next jumping sensor node of sink node; Perhaps when not receiving beacon frame, packet is sent the sensor node that is given to fixedly next jumping of sink node according to route;
Whether the remaining space that the sensor node also is used to judge its buffer area is smaller or equal to preset value a; At remaining space smaller or equal to preset value a; And the mobile sink node is in one of which jumping scope the time, according to the FIFO principle packet in its buffer area is sent next that be given to fixing sink node successively according to route and jumps sensor node, until remaining space greater than preset value a; And state timer duration of work is when receiving beacon frame once more, the rebooting status timer; Perhaps at the state timer to after date, cancellation status indication, and the packet in the buffer area sent according to route be given to fixedly next jumping sensor node of sink node.
As shown in Figure 2, be the flow chart of mixing sink node WSN method of data capture according to the invention; In the present embodiment, specifically comprise the steps:
Step S01: set up at least one respectively for all sensor nodes in netting and arrive the fixedly route of sink node;
In this step; The sensor node can be the existing Routing Protocol that is applied to any type among the WSN to the fixing route of sink node; As shortest path Routing Protocol, wireless self-networking as required plan range vector Routing Protocol (Ad hoc On-Demand Distance Vector Routing, AODV), energy equalizing routing protocol etc.
Each sensor node has at least one to arrive the fixedly route of sink node, and WSM can carry out operate as normal, and when the sensor node needed reported data, the route of setting up by this step was to fixing sink node transmission data.
Step S02: the best of calculating the mobile sink node moves radius U;
This step is calculated the best radius that moves of mobile sink node through following formula
Wherein,
π (R
2-(u-r)
2) p θ+π (u-r)
2, β=2arcsin (r/ (u+r)), θ=1-M*arcsin (r/u)/π,
Expression network node maximum energy consumption, θ representes that mobile sink node neighbor node sends to the fixedly probability of sink node with real time data, M is the number of mobile sink node; R is a network coverage radius, and r is a sensor node communication radius, and ρ is a sensor node data uploading rate; P is the ratio that the sensor node is uploaded real time data in the data; And p ∈ [0-1], ε is the mobile radius of sink node for the energy that the sensor node sends and the receiving element data need consume, u for moving.
Pairing u is that the best of mobile sink node moves radius U when getting minimum value as
.
Step S03: for being provided with of mobile sink node moved radius and move mode;
In the present embodiment, the move mode of mobile sink node is: from start bit, behind the whenever mobile setpoint distance l, stop setting-up time n.
Step S04: the mobile sink node is according to preset move mode, around fixing sink node motion, and periodically distributes beacon frame to the sensor node that is adjacent with the preset best radius U that moves;
The mobile sink node is the center of circle with fixing sink node, on the preset circle that moves radius, moves, and periodically to the sensor node distribution beacon frame that is adjacent, and in time of staying n, collect from the packet of neighbours sensor node.
Step S05:sensor node judges whether to receive beacon frame; If, execution in step S06 then; Otherwise, execution in step S12;
Step S06: when receiving the sensor node starting state timer of beacon frame, oneself state is labeled as the neighbor node of mobile sink node;
The work duration t of state timer is less than required duration T of one week of mobile sink node motion, and the state variation relation of sensor node is as shown in Figure 3.
Step S07: the mobile sink node of judging the distribution beacon frame whether in one of which jumping scope, if, execution in step S08 then; Otherwise, execution in step S09;
The sensor node of receiving beacon frame is also judged the state of state timer when the mobile sink node of judging the distribution beacon frame is whether in one of which jumping scope, idiographic flow is as shown in Figure 4.
Step S08: packet is sent to above-mentioned mobile sink node, finish;
Among the present invention, the packet at sensor node place comprises the packet that self perception and the packet that generates and other sensor nodes of receiving send.
In this step; If in the buffer area packet is arranged; The then above-mentioned packet that sends to the mobile sink node not only comprises current receive and/or the packet that generates, also comprises the packet in the buffer area, that is to say; The sensor node of receiving beacon frame all sends to above-mentioned mobile sink node with all packets when corresponding mobile sink node is in one of which jumping scope.
Step S09: the type of judgment data bag, if time-delay tolerance type packet, then execution in step S10; If real-time packet, then execution in step S11;
Step S10: packet is temporary to buffer area, execution in step S07;
Receive that the buffer area of the sensor node of beacon frame defers to the FIFO rule.For avoiding causing loss of data because of buffer area overflows, receive that the sensor node of beacon frame need periodically monitor the remaining space of its buffer area, concrete steps are seen shown in Figure 5.
Step S11: packet is given to fixedly next jumping sensor node of sink node according to the route transmission, finishes;
Step S12: packet is given to fixedly next jumping sensor node of sink node according to the route transmission, finishes.
As shown in Figure 3, be that the state variation of sensor node of the present invention concerns sketch map; When the sensor node is received the beacon frame of mobile sink node distribution, be the neighbor node of mobile sink node with its status indication; If do not receive beacon frame in the time once more at t, then cancel status indication, promptly revert to common sensor node, at this moment, the sensor node sends all packets according to route and is given to fixedly next jumping sensor node of sink node.
As shown in Figure 4, be the flow chart of receiving the sensor node monitoring state timer of beacon frame among the present invention, may further comprise the steps:
Step S40: judge whether the state timer expires, if, execution in step S43 then; Otherwise, execution in step S41;
Step S41: judge whether to receive once more beacon frame, if, execution in step S42 then; Otherwise, execution in step S40;
Step S42: the rebooting status timer, execution in step S07 finishes;
Step S43: cancel status indication, and the packet in the buffer area is sent next the jumping sensor node that is given to said fixedly sink node through route, finish.
As shown in Figure 5, be the flow chart of receiving the sensor node monitoring buffer area of beacon frame among the present invention, may further comprise the steps:
Step S51: whether the remaining space H that periodically monitors buffer area smaller or equal to preset value a, if, execution in step S52 then; Otherwise, continue to carry out this step;
Step S52: according to the FIFO principle packet in the buffer area is sent through route successively and to be given to fixedly next jumping sensor node of sink node, until remaining space H greater than preset value a.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present invention.
Claims (13)
1. one kind is mixed sink node radio sensing network WSM, comprises fixedly sink node, at least one mobile sink node and a plural sensor node, it is characterized in that said WSM integral body is deployed as circle;
Said fixedly sink node is arranged on the center of said WSN;
Said sensor node is the center of circle with said fixedly sink node, evenly is arranged in the said WSM coverage;
Said mobile sink node moves radius around said fixedly sink node motion according to preset move mode to preset.
2. mixing sink node WSN according to claim 1 is characterized in that,
Said mobile sink node is to the sensor node distribution beacon frame that is adjacent, and the packet of collection sensor node transmission;
Said sensor node judges whether to receive beacon frame, and when receiving beacon frame, and whether the sink node of judging the said beacon frame of distribution is in one of which jumping scope; If; Then packet is sent to said mobile sink node, otherwise, the type of judgment data bag; The tolerance type of will delaying time packet is temporary to buffer area, the real-time packet is sent to next jumping sensor node of said fixedly sink node according to route; Perhaps when not receiving beacon frame, packet is sent to next jumping sensor node of said fixedly sink node according to route.
3. mixing sink node WSN according to claim 2 is characterized in that,
Said mobile sink node provides parameter that interface is set;
Said sensor node is provided with the state timer, and when receiving beacon frame, said sensor node starts said state timer; Simultaneously oneself state is labeled as the neighbor node of mobile sink node; And when said state timer duration of work is received beacon frame once more, restart said state timer, perhaps at said state timer to after date; Cancel status indication, and the packet in the buffer area is sent to next jumping sensor node of said fixedly sink node according to route.
4. mixing sink node WSN according to claim 2 is characterized in that,
Said sensor node judges that whether the remaining space of its buffer area is smaller or equal to preset value; And at said remaining space smaller or equal to preset value; And the mobile sink node is not in one of which jumping scope the time; Next jumps sensor node according to the fifo fifo principle sends to said fixedly sink node according to route successively with the packet in its buffer area, until said remaining space greater than said preset value.
5. a method of data capture of mixing the sink node WSN is characterized in that, said method comprising the steps of:
The mobile sink node is periodically to the sensor node distribution beacon frame that is adjacent;
The sensor node of receiving beacon frame judges that said mobile sink node is whether in one of which jumping scope, if then packet is sent to said mobile sink node; Otherwise the tolerance type of will delaying time packet is temporary to buffer area, and the real-time packet is sent to fixedly next jumping sensor node of sink node according to route;
The sensor node of not receiving beacon frame sends to fixedly next jumping sensor node of sink node according to route with packet.
6. the method for data capture of mixing according to claim 5 sink node WSN is characterized in that, said method at said mobile sink node periodically before the sensor node distribution beacon frame step that is adjacent, further comprising the steps of:
Set up at least one respectively for all the sensor nodes in netting and arrive the fixedly route of sink node;
Calculate the mobile radius of said mobile sink node;
For being provided with, said mobile sink node moves radius and move mode.
7. the method for data capture of mixing sink node WSN according to claim 6 is characterized in that, the best radius U of moving of said mobile sink node calculates through following formula
Wherein,
π (R
2-(u-r)
2) p θ+π (u-r)
2, β=2arcsin (r/ (u+r)), θ=1-M*arcsin (r/u)/π,
Expression network node maximum energy consumption, θ representes that mobile sink node neighbor node sends to the fixedly probability of sink node with real time data, M is the number of mobile sink node; R is a network coverage radius, and r is a sensor node communication radius, and ρ is a sensor node data uploading rate; P is the ratio that the sensor node is uploaded real time data in the data; And p ∈ [0-1], ε is the mobile radius of sink node for the energy that the sensor node sends and the receiving element data need consume, u for moving.
Pairing u is that the best of mobile sink node moves radius U when getting minimum value as
.
8. the method for data capture of mixing sink node WSN according to claim 6 is characterized in that said move mode is:
Said mobile sink node behind the whenever mobile setpoint distance, stops setting-up time from start bit.
9. the method for data capture of mixing sink node WSN as claimed in claim 5 is characterized in that, the said sensor node of receiving beacon frame is operated below also carrying out when receiving beacon frame:
The starting state timer is labeled as oneself state the neighbor node of mobile sink node.
10. the method for data capture of mixing according to claim 5 sink node WSN is characterized in that, the said sensor node of receiving beacon frame is judged said mobile sink node not in one of which jumping scope the time, operation below also carrying out:
The type of judgment data bag.
11. the method for data capture of mixing according to claim 5 sink node WSN is characterized in that, the said sink node of the receiving beacon frame tolerance type packet of will delay time is kept in behind buffer area, also carries out following steps:
Whether the remaining space of periodically judging buffer area is smaller or equal to preset value; If; Next that then packet in the buffer area is sent to fixing sink node through route successively according to the FIFO principle jumped sensor node, until said remaining space greater than said preset value.
12. the method for data capture of mixing sink node WSN according to claim 9 is characterized in that the said sensor node of receiving beacon frame if receive beacon frame once more, is then restarted said state timer at said state timer duration of work; Otherwise, to after date, cancel status indication at said state timer, and the packet in the buffer area sent to fixedly next jumping sensor node of sink node according to route.
13. the method for data capture according to each described mixing sink node WSN among the claim 5-12 is characterized in that, said packet comprises the packet of said sensor node self generation and the packet that other sensor nodes send.
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| CN106231631B (en) * | 2016-09-26 | 2019-08-09 | 陕西尚品信息科技有限公司 | A kind of formation gathering method based on tree-shaped Ad-hoc wireless network |
| CN111050353A (en) * | 2018-10-11 | 2020-04-21 | 华为技术有限公司 | Data transmission method and device for wireless backhaul network |
| US11496923B2 (en) | 2018-10-11 | 2022-11-08 | Huawei Technologies Co., Ltd. | Data transmission method and apparatus used in wireless backhaul network |
| CN112689314A (en) * | 2020-12-22 | 2021-04-20 | 哈尔滨学院 | Multi-hop wireless sensor network data path optimization method based on memory allocation |
| CN112689314B (en) * | 2020-12-22 | 2021-09-14 | 哈尔滨学院 | Multi-hop wireless sensor network data path optimization method based on memory allocation |
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